Glass cloth roll packagaging body

Abstract

Provided is a glass cloth roll packaging body with which the environment around glass cloth can be easily maintained during transportation of a glass cloth roll, and with which there is hardly any moisture absorption during storage of the glass cloth. In one embodiment, a packaging body comprises a glass cloth roll sealing body and a packaging box, wherein: the sealing body includes a glass cloth roll, and a film that has an internal space and that seals at least the glass cloth roll; the glass cloth roll includes a hollow columnar core tube and a glass cloth wound around the core tube; the packaging box has a bottom plate, an upper plate, and side plates; the side plates each include a roll facing surface that faces an axial end surface of the glass cloth roll; the roll facing surfaces satisfy at least one of (1) at least one of the roll facing surfaces is movable with respect to the bottom plate, and (2) at least one of the roll facing surfaces is separated from the axial end surface of the glass cloth roll by a shortest gap distance GD; and the shortest gap distance GD is greater than 5 mm.

Description

Glass cloth roll packaging

[0001] This invention relates to glass cloth roll packaging and the like.

[0002] In recent years, insulating materials that combine heat resistance and dielectric properties have been desired for applications such as printed circuit boards for high-speed communications, and glass cloth has been used as a base material for such insulating materials. One known method for improving the dielectric properties of glass cloth is to use glass yarn with a silicon dioxide (SiO2) composition of 98% to 100% by mass (Patent Document 1). However, materials composed of glass fibers, such as glass cloth containing a large amount of SiO2, may absorb moisture during storage. Therefore, techniques for controlling the humidity in the atmosphere during storage of such materials have been conventionally proposed.

[0003] For example, Patent Document 2 describes a packaging method for wrapping quartz glass cloth containing 99.5% by mass or more of SiO2 in a packaging film, wherein the volumetric absolute humidity inside the packaging is 10.0 g / m³. 3 The following describes the packaging method for quartz glass cloth.

[0004] Furthermore, for example, Patent Document 3 contains 95% by mass or more of SiO2 and has a specific surface area of ​​5.0 m². 2 A method for storing quartz glass fibers at a density of 15 g / m or less, wherein the temperature is 100°C or below and the volumetric absolute humidity is 15 g / m 3 A method for storing quartz glass fibers is described, characterized in that the fibers are stored in the following atmosphere, and the water absorption rate of the quartz glass fibers after storage under the above conditions is 0.10% by mass or less.

[0005] Glass cloth is sometimes provided in roll form wound around a core tube for convenience of transportation. Conventionally, various methods have been proposed for transporting rolls of sheets, films, etc. For example, Patent Document 4 describes a technology relating to glass film rather than glass cloth, and specifically describes a glass roll packaging comprising a glass roll formed by winding glass film in a roll shape around a winding core with both axial sides of the winding core exposed, and a box body having a pair of support parts that support both axial sides of the winding core and that houses the glass roll in a state supported by the pair of support parts, wherein the entire glass roll is covered by the bag body and the glass roll is supported by the pair of support parts.

[0006] Furthermore, for example, Patent Document 5 describes a packaging box containing a roll body, comprising a corrugated cardboard packaging box and a roll body having a core housed in the packaging box, wherein the packaging box comprises a bottom member, a first side plate provided on the bottom member, and a second side plate provided on the bottom member opposite to the first side plate, the first side plate and the second side plate each having a bearing portion that supports the core of the roll body, the bearing portion having an arc-shaped bearing bottom when viewed from the front, a notch formed below each bearing portion having a width narrower than the width of the bearing portion, the core of the roll body being supported by the bearing portion of the packaging box, the notch having a pair of notch sides and a notch bottom, the peak of the pressure applied by the core to the bearing portion when viewed from the direction of the central axis of the roll body being located at the positions of the bearing bottoms on both sides of the notch, and the roll body being arranged so as not to contact the notch bottom.

[0007] Japanese Patent Publication No. 2018-127747, Japanese Patent Publication No. 2024-090438, Japanese Patent Publication No. 2024-090433, International Publication No. 2019 / 220997, Japanese Patent Publication No. 2023-075274

[0008] When transporting glass cloth in roll form, the glass cloth is often wound around a hollow cylindrical core tube to form a glass cloth roll. The roll is then transported by moving the support rod, either in a cantilevered state with a support rod inserted into the hollow part from one end of the core tube, or in a double-supported state with support rods inserted into the hollow part from both ends of the core tube. After such transport, the glass cloth roll is packed into boxes or other containers for transport. However, the moisture-proofing technologies described in Patent Documents 2 and 3 did not provide adequate moisture protection during such transport, packaging, and shipping. The packaging technologies described in Patent Documents 4 and 5 did not take moisture protection into consideration and did not take into account transport that maintains a moisture-proof environment around the contents. Glass cloth, especially glass cloth for insulating materials, is brittle and easily damaged, but it is desirable to prevent even slight damage in order to maintain performance. Upon investigation, it became clear that even if the moisture-proofing technology described in Patent Documents 2 and 3 were applied to the packaging technology described in Patent Documents 4 and 5, the glass cloth rolls are heavy and large, and it is necessary to insert support rods into the hollow sections and handle them with the support rods horizontally present. As a result, with conventional packaging, the film would be damaged during transport, packaging, and shipping, especially near the end faces in the roll width direction. In other words, there has been no conventional packaging technology that prevents both damage to the moisture-proof film used to maintain a moisture-proof environment during the transport of glass cloth rolls and moisture absorption during storage of the glass cloth.

[0009] One aspect of the present invention aims to solve the above problems and provide a glass cloth roll packaging that makes it easier to maintain the environment around the glass cloth during transport and less prone to moisture absorption during storage.

[0010] The present disclosure includes the following items: [1] A glass cloth roll packaging comprising a glass cloth roll seal and a packaging box for housing the glass cloth roll seal, wherein the glass cloth roll seal includes a glass cloth roll and a film having an internal space and sealing at least the glass cloth roll, the glass cloth roll includes a hollow columnar core tube and glass cloth wound around the core tube, the glass cloth is composed of glass threads containing a plurality of filaments as warp and weft threads, the packaging box has a bottom plate, a top plate and a side plate, the side plate has a roll-facing surface facing the axial end face of the glass cloth roll, and the roll-facing surface satisfies at least one of the following (1) and (2): (1) at least one of the roll-facing surfaces is movable relative to the bottom plate, (2) at least one of the roll-facing surfaces is separated from the axial end face of the glass cloth roll by a minimum gap distance GD, and the minimum gap distance GD is greater than 5 mm. [2] A glass cloth roll packaging comprising a glass cloth roll seal and a packaging box for housing the glass cloth roll seal, wherein the glass cloth roll seal includes a glass cloth roll and a film having an internal space that seals at least the glass cloth roll, the glass cloth roll includes a hollow columnar core tube and glass cloth wound around the core tube, the glass cloth is composed of glass threads containing a plurality of filaments as warp and weft threads, the packaging box has a bottom plate, a top plate and side plates, the side plates have roll-facing surfaces facing the axial end face of the glass cloth roll, and the roll-facing surfaces satisfy at least one of the following (1) and (2): (1) at least one of the roll-facing surfaces is movable relative to the bottom plate, (2) at least one of the roll-facing surfaces is separated from the axial end face of the glass cloth roll by the shortest gap distance GD, The glass cloth roll packaging is such that the shortest gap distance GD is such that the shortest gap distance GD and the film thickness T satisfy the formula: GD ≥ T × 60.[3] The glass cloth roll packaging according to item 2, wherein the shortest gap distance GD and the film thickness T satisfy the formula: GD ≤ T × 1500. [4] The glass cloth roll packaging according to any one of items 1 to 3, wherein the dew point of the internal space is 18°C ​​dp or less. [5] The glass cloth roll packaging according to any one of items 1 to 4, wherein the difference between the inner dimensions of the packaging box in the axial direction of the glass cloth roll and the total axial length of the glass cloth roll is 15 cm or less. [6] The glass cloth roll packaging according to any one of items 1 to 5, wherein the value obtained by dividing the difference between the inner dimensions of the packaging box in the direction corresponding to the axial direction of the glass cloth roll and the total axial length of the glass cloth roll by the film thickness T is 110 or more. [7] The glass cloth roll packaging according to any one of items 1 to 6, wherein at least one of the roll-facing surfaces is separated from the axial end face of the glass cloth roll by a minimum gap distance GD, and the side plate having at least one of the roll-facing surfaces has a notch with a width of 50% or more of the inner diameter of the core tube and less than the outer diameter of the core tube. [8] The glass cloth roll packaging according to any one of items 1 to 7, wherein the core tube has a pair of exposed regions at both axial ends where the glass cloth is not wound, and the packaging box further has a support that supports the glass cloth roll in the exposed regions. [9] The glass cloth roll packaging according to item 8, wherein the support has at least a pair of support plates having notches extending downward from the upper end, the pair of support plates are fixed vertically separated from each other, and the glass cloth roll is supported by the support by each of the pair of exposed regions being placed on each of the notches.

[10] The glass cloth roll packaging according to item 8, wherein the support has a pair of support plates having cutouts, and the glass cloth roll is supported by the support by the support, with the support plates positioned vertically such that each of the pair of exposed regions is inserted axially into each of the cutouts.

[11] The glass cloth roll packaging according to any one of items 8 to 10, wherein the support is located inside the glass cloth roll sealing body.

[12] The glass cloth roll packaging according to item 11, wherein the shortest gap distance GD is 1 cm or more.

[13] The glass cloth roll packaging according to item 12, wherein the shortest distance between each of the roll-facing surfaces and the support is 1 cm to 15 cm.

[14] The glass cloth roll packaging according to item 8 or 9, wherein the support is located outside the glass cloth roll sealing body.

[15] The glass cloth roll packaging according to item 14, wherein the shortest gap distance GD is 1 cm or more.

[16] The glass cloth roll packaging according to any one of items 8 to 15, further comprising a cushioning material disposed between the support and the exposed area.

[17] The glass cloth roll packaging according to any one of items 1 to 16, further comprising a cushioning material disposed between the roll-facing surfaces and the axial end faces of the glass cloth rolls.

[18] The glass cloth roll packaging according to any one of items 1 to 17, wherein the core tube has a pair of exposed regions at both axial ends where the glass cloth is not wound, and further comprises a cushioning material disposed on the exposed regions along the roll axial end faces of the glass cloth within the glass cloth roll sealing body.

[19] The glass cloth roll packaging according to any one of items 1 to 18, further comprising a desiccant disposed in the internal space.

[20] The amount of desiccant enclosed is given by the following formula: WVTR [g / (m). 2 ×24hr) × Film surface area [m²] 2 A glass cloth roll packaging according to item 19, satisfying the following: ] / amount of desiccant enclosed [g] ≤ 0.0030 (wherein WVTR is the water vapor transmission rate of the film measured at a temperature of 40°C and a relative humidity of 90%).

[21] A glass cloth roll packaging according to any one of items 1 to 20, wherein the thickness of the bottom plate, the side plate, and the top plate is 0.3 cm or more, each.

[22] The water vapor transmission rate of the film is 8 g / (m 2

[23] A glass cloth roll packaging according to any of items 1 to 21, wherein the film thickness is 50 μm or more.

[24] A glass cloth roll packaging according to any of items 1 to 23, wherein the weight of the glass cloth roll is 5 kg or more.

[25] A glass cloth roll packaging according to any of items 1 to 24, wherein the difference between the outer diameter of the glass cloth wound on the core tube and the outer diameter of the core tube is 1 cm or more.

[26] A glass cloth roll packaging according to any of items 1 to 25, wherein the dielectric loss tangent of the glass cloth at 10 GHz is 0.00200 or less.

[27] A glass cloth roll packaging according to any of items 1 to 26, wherein the silicon (Si) content in the glass yarn is 95.0% to 100% by mass in terms of silicon dioxide (SiO2).

[0011] According to one aspect of the present invention, a glass cloth roll packaging can be provided that makes it easier to maintain the environment around the glass cloth roll during transportation and that prevents moisture absorption during storage of the glass cloth.

[0012] Figure 1A is a front view of a glass cloth roll packaging 1 according to an example of this embodiment, viewed in the direction of the glass cloth roll axis. Figure 1B is a front view of the glass cloth roll packaging 1 of Figure 1A, viewed in the direction of the glass cloth roll diameter. Figure 2A is a front view of a glass cloth roll packaging 2 according to an example of this embodiment, viewed in the direction of the glass cloth roll axis. Figure 2B is a front view of the glass cloth roll packaging 2 of Figure 2A, viewed in the direction of the glass cloth roll diameter. Figure 3A is a front view of a support and glass cloth roll according to an exemplary embodiment, viewed in the direction of the glass cloth roll axis. Figure 3B is a front view of the support and glass cloth roll of Figure 3A, viewed in the direction of the glass cloth roll diameter. Figure 4A is a front view of a support and glass cloth roll according to an exemplary embodiment, viewed in the direction of the glass cloth roll axis. Figure 4B is a front view of the support of Figure 4A, viewed in the direction of the glass cloth roll diameter. Figure 4C is a front view of the support and glass cloth roll of Figure 4A, viewed in the direction of the glass cloth roll diameter. Figure 5 is a front view of a film, a support within the film, and a glass cloth roll according to an exemplary embodiment, viewed in the direction of the glass cloth roll axis. Figure 6 is a front view of the film, the support outside the film, and the glass cloth roll according to the exemplary embodiment, viewed in the direction of the glass cloth roll axis. Figure 7A is a front view of the cushioning material, the support, and the glass cloth roll according to the exemplary embodiment, viewed in the direction of the glass cloth roll axis. Figure 7B is a front view of the cushioning material, the support, and the glass cloth roll of Figure 7A, viewed in the direction of the glass cloth roll radially. Figure 8 is a front view of the cushioning material, the support, and the glass cloth roll according to the exemplary embodiment, viewed in the direction of the glass cloth roll axis. Figure 9 is a front view of the cushioning material, the support, and the glass cloth roll according to the exemplary embodiment, viewed in the direction of the glass cloth roll axis.

[0013] The embodiments of this disclosure (hereinafter referred to as "these embodiments") will be described below. This disclosure is not limited to these embodiments, and various modifications are possible without departing from its essence. In these embodiments, numerical ranges described using "~" include the numbers before and after "~" as the lower and upper limits. In these embodiments, in numerical ranges described in stages, the upper or lower limit described in one numerical range may be replaced with the upper or lower limit of another numerical range described in stages. In these embodiments, the upper or lower limit described in one numerical range may also be replaced with the values ​​shown in the "Examples" section of this disclosure. In these embodiments, the term "process" is included not only in the sense of an independent process, but also in the sense of achieving the function of a process, even if it cannot be clearly distinguished from other processes. In the drawings, elements denoted by the same reference numeral are intended to have similar functions.

[0014] <<Glass Cloth Roll Packaging>> One aspect of the present invention provides a glass cloth roll packaging comprising a glass cloth roll seal and a packaging box for housing the glass cloth roll seal. In one aspect, the glass cloth roll seal includes a glass cloth roll and a film having an internal space that seals at least the glass cloth roll. In one aspect, the glass cloth roll includes a hollow columnar core tube and glass cloth wound around the core tube. In one aspect, the glass cloth is composed of glass threads containing a plurality of filaments as warp and weft threads.

[0015] In one embodiment, the packaging box has a bottom plate, a top plate, and side plates, the side plates having roll-facing surfaces that face the axial end faces of the glass cloth rolls, and the roll-facing surfaces satisfy at least one of the following (1) and (2): (1) at least one of the roll-facing surfaces is movable relative to the bottom plate, and (2) at least one of the roll-facing surfaces is separated from the axial end faces of the glass cloth rolls by a minimum gap distance GD. In one embodiment, the minimum gap distance GD is greater than 5 mm. In one embodiment, the minimum gap distance GD is a value such that the minimum gap distance GD and the film thickness T satisfy the formula: GD ≥ T × 60.

[0016] In this disclosure, "sealed" means a state in which the internal space is not in fluid communication with the external environment. Therefore, "sealed" is not limited to a state in which no mass transfer occurs between the internal space and the external environment. More specifically, "sealed" means a state in which the opening is tightly closed without gaps, and the temperature, dew point, and atmospheric pressure of the internal space of the sealed body can be controlled to be below a certain standard. Furthermore, sealing preferably means sealing in a way that prevents the intrusion of solids, liquids, and gases. By suppressing the intrusion of solids, liquids, and gases, it is easier to obtain the effect of suppressing the increase in the dielectric loss tangent of the glass cloth. The sealing method may be, for example, a method of closing the end of the film (for example, the opening of a bag-shaped or tubular film) with heat sealing, tape, zipper, adhesive, etc. During storage of glass cloth rolls, moisture can also enter the glass cloth through water vapor permeation from the core tube. For this reason, by not only covering and sealing the glass cloth on the core tube with film, but also by sealing the entire glass cloth roll including the hollow part of the core tube with film, the increase in the dielectric loss tangent of the glass cloth due to such water vapor permeation from the core tube can also be reduced.

[0017] In the glass cloth roll packaging of this embodiment, the film is required to seal the glass cloth roll. Such films tend to be thicker (i.e., bulkier) than films intended simply for packaging, and are prone to damage from interference with the packaging box during packaging. Damaged parts of the film may have impaired sealing performance. The glass cloth roll packaging of this embodiment, particularly due to the unique shape of the side plates, makes it difficult for such bulky films to be damaged, even when used. As a result, moisture absorption of the glass cloth roll during storage inside the glass cloth roll packaging, and the resulting increase in dielectric loss tangent, can be effectively suppressed. In addition, in the glass cloth roll packaging of this embodiment, particularly due to the unique shape of the side plates, the glass cloth roll is well held during transport, and damage to the film due to vibration, etc., is less likely to occur. Therefore, according to this embodiment, a glass cloth roll packaging can be provided that makes it easy to maintain the environment around the glass cloth during transport and makes it difficult for moisture absorption to occur during storage of the glass cloth.

[0018] <Glass Cloth> Glass cloth has a structure in which glass threads containing multiple glass filaments are used as warp and weft threads in a woven manner. Examples of weaving structures for glass cloth include plain weave, twill weave, satin weave, and twill weave. Among these, the plain weave structure is preferred.

[0019] The weft and warp thread counts of the glass cloth are preferably 10 to 120 threads / inch (= 10 to 120 threads / 25 mm) independently of each other. The lower limit of the weft count is more preferably 20 threads / inch or more, 30 threads / inch or more, 40 threads / inch or more, 50 threads / inch or more, 60 threads / inch or more, or 66 threads / inch or more. The upper limit of the weft count is more preferably 110 threads / inch or less, or 100 threads / inch or less. If the weft count is within the above range, it is easier to obtain glass cloth of a desirable thickness. The weft and warp thread counts may be different.

[0020] The basis weight (mass) of the glass cloth is preferably 8 to 250 g / m².2 、 More preferably 8 to 100 g / m 2 、 Even more preferably 8 to 80 g / m 2 、 Even more preferably 8 to 60 g / m 2 、 Particularly preferably 8 to 50 g / m 2 、 Or 8 to 45 g / m 2 is. If the basis weight of the glass cloth is within the above range, it is easy to obtain a glass cloth with a preferable thickness.

[0021] The thickness of the glass cloth is preferably more than 0 and 120 μm or less. The upper limit value of the thickness of the glass cloth is more preferably 100 μm or less, even more preferably 60 μm or less, even more preferably 55 μm or less, and particularly preferably 50 μm or less. If the thickness of the glass cloth is within the above range, it is easy to obtain a glass cloth suitable as an insulating material. The lower limit value of the thickness of the glass cloth may be more preferably 5 μm or more, or 10 μm or more.

[0022] The glass fibers constituting the glass cloth are preferably obtained using a low dielectric glass as a raw material. The low dielectric glass fibers more preferably have a silicon (Si) content of 95.0% by mass or more and 100% by mass or less in terms of SiO2. By using such glass fibers, the dielectric properties of the obtained glass cloth can be improved. Also, in such glass fibers, an increase in the dielectric tangent of the glass cloth over time is remarkably observed, so the advantages of the package body of the present embodiment are more remarkable. From the viewpoint of improving the dielectric properties, the Si content is preferably 99.0% by mass or more, more preferably 99.5% by mass or more, and even more preferably 99.9% by mass or more.

[0023] The average filament diameter of the glass filaments constituting the glass yarn is preferably 2.5 μm or more and 9.0 μm or less, more preferably 2.5 μm or more and 8.0 μm or less, still more preferably 3.5 μm or more and 7.5 μm or less, even more preferably 3.5 μm or more and 7.0 μm or less, and particularly preferably 3.5 μm or more and 6.5 μm or less. When the filament diameter is at least the above lower limit value, it is easy to ensure the breaking strength of the filament, and thus it is difficult for fluff to occur in the obtained glass cloth. Further, when the filament diameter is at most the above upper limit value, it is possible to prevent the mass of the glass cloth from becoming too large, so that it is easy to carry out transportation or processing.

[0024] The glass cloth preferably has a surface treatment agent containing a silane coupling agent on its surface. More specifically, the glass yarns (including glass filaments) constituting the glass cloth are preferably surface-treated with a surface treatment agent containing a silane coupling agent. When the glass cloth has a surface treatment agent, the reactivity (adhesiveness) with the matrix resin when combined with the matrix resin tends to improve. Further, since it is less susceptible to the influence of moisture during storage, it is possible to more effectively suppress the increase in dielectric loss tangent over time.

[0025] As the silane coupling agent, for example, the following formula (1): X(R) 3-n SiY n ...(1) {In formula (1), X is an organic functional group having at least one of an unsaturated double bond group having radical reactivity such as a carbon-carbon double bond having radical reactivity and an amino group, Y is each independently an alkoxy group, n is an integer of 1 or more and 3 or less, and R is a group selected from the group consisting of a methyl group, an ethyl group and a phenyl group} It is preferable to use a silane coupling agent represented by the formula.

[0026] From the viewpoint of reactivity with the matrix resin, X in formula (1) is more preferably an organic functional group having one or more methacryloxy groups or an organic functional group having one or more acryloxy groups.

[0027] Regarding Y in formula (1) above, as the alkoxy group, a carbon alkoxy group having 1 to 5 carbon atoms (1, 2, 3, 4, or 5 carbon atoms) is preferred for stable treatment of the glass cloth.

[0028] As a surface treatment agent, the silane coupling agent shown in formula (1) may be used alone, or two or more silane coupling agents with different values ​​of X in formula (1) may be used in mixture form. Furthermore, as the silane coupling agent shown in formula (1), for example, vinyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, acryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, 5-hexenyltrimethoxysilane, etc., can be used individually or in mixtures thereof.

[0029] The molecular weight of the silane coupling agent is preferably 100 to 600, more preferably 150 to 500, and even more preferably 200 to 450. In particular, it is especially preferable to use two or more silane coupling agents with different molecular weights. By treating the glass filament surface with two or more silane coupling agents with different molecular weights, the density of the treatment agent on the glass surface increases, and the reactivity (adhesion) with the matrix resin tends to improve further.

[0030] From the viewpoint of not inhibiting reactivity with resins, silane coupling agents are preferably nonionic. Among nonionic silane coupling agents, those having at least one group selected from the group consisting of vinyl groups, methacryloxy groups, and acryloxy groups are preferred, and among these, silane coupling agents having at least one methacryloxy group or acryloxy group are particularly preferred. By not inhibiting reactivity with resins, the heat resistance and reliability of printed circuit boards using glass cloth, for example, can be improved.

[0031] [Dielectric Loss Tangent] In one embodiment, the dielectric loss tangent of the glass cloth at 10 GHz, as measured by the method described in the [Examples] section of this disclosure, is 0.00200 or less. In such glass cloth, the dielectric loss tangent of the glass cloth tends to increase over time due to the influence of water in the storage environment, making the advantages of the packaging of this embodiment even more pronounced. The dielectric loss tangent of the glass cloth at 10 GHz is preferably 0.00010 or more and 0.00200 or less. In one embodiment, the upper limit of the dielectric loss tangent is 0.00200 or less, preferably 0.00160 or less, more preferably 0.00120 or less, even more preferably 0.00090 or less, even more preferably 0.00070 or less, particularly preferably 0.00050 or less, and particularly preferably 0.00040 or less. The lower limit of the dielectric loss tangent is preferably 0.00010 or higher, 0.00012 or higher, 0.00014 or higher, or 0.00015 or higher. When the dielectric loss tangent of the glass cloth is within the above range, the advantages of the packaging of this embodiment are more pronounced because the glass cloth is susceptible to an increase in dielectric loss tangent due to the influence of surrounding moisture. Conventionally, it has been thought that in the temperature range below 100°C, moisture does not activate the reaction in which the Si-O-Si bond is cleaved and a Si-OH group is formed, so even if glass cloth with a dielectric loss tangent of 0.00200 or less at 10 GHz in the temperature range below 100°C is stored for a long period of time, the dielectric loss tangent of the glass cloth will not change over time. For this reason, the storage method of the glass cloth was not given special consideration, and even glass cloth with a low dielectric loss tangent at the time of manufacture may have its dielectric loss tangent increase over time. In this regard, the glass cloth roll packaging of this disclosure suppresses the cleavage of Si-O-Si bonds and the generation of Si-OH groups due to moisture entering the storage environment (i.e., the internal space of the glass cloth roll packaging) from the external environment, thereby suppressing the rise in the dielectric loss tangent of the glass cloth over time. In this disclosure, "suppression" does not mean that the dielectric loss tangent does not rise at all, but rather that the rise in the dielectric loss tangent is suppressed to a certain extent.

[0032] In a glass cloth roll packaging, the dielectric loss tangent change rate, defined by the following formula: Dielectric Loss Tangent Change Rate (%) = (Dielectric Loss Tangent after 30 days of storage) / (Initial Dielectric Loss Tangent) × 100, indicates that the smaller its value, the greater the effect of controlling the storage environment by the sealing body. The above dielectric loss tangent change rate is evaluated as the change rate of the dielectric loss tangent after 30 days, starting from the time when the glass cloth storage begins. Here, the time when storage begins is the time when the glass cloth roll packaging is manufactured. The dielectric loss tangent change rate is preferably 140% or less, more preferably 130% or less, even more preferably 120% or less, even more preferably 110% or less, and particularly preferably 105% or less. The dielectric loss tangent change rate is measured by the method described in the [Examples] section of this disclosure.

[0033] [Ignition Loss Value] The ignition loss value of the glass cloth is preferably 0.01% by mass or more and less than 2.0% by mass, more preferably 0.01% by mass or more and less than 1.5% by mass, even more preferably 0.02% by mass or more and less than 1.0% by mass, even more preferably 0.03% by mass or more and less than 0.8% by mass, and particularly preferably 0.03% by mass or more and less than 0.3% by mass. When the ignition loss value is within the above range, it is easy to obtain glass cloth that exhibits a low dielectric loss tangent. Here, the ignition loss value is measured in accordance with JIS R3420.

[0034] [Manufacturing of Glass Cloth] Glass cloth may be manufactured by a method that includes weaving glass yarn containing multiple glass filaments as warp and weft threads. The manufacturing method of glass cloth may further include a step of heat-cleaning the glass yarn or glass cloth, and a step of treating the glass yarn or glass cloth with a surface treatment agent. The manufacturing method of glass cloth may optionally further include one or more of the steps of opening the glass cloth and a slitting step. Two or more of these steps may be performed simultaneously, and the order of the steps is not limited.

[0035] (Weaving Process) The weaving method is not particularly limited as long as the weft and warp threads can be woven to achieve a predetermined weave structure. The preferred composition and structure of the glass yarn used, as well as the weave structure, are as described above.

[0036] (Heating De-oiling Process) The heating de-oiling process can be performed on glass yarn, or on woven glass cloth. In other words, the process of weaving glass yarn to obtain glass cloth may be performed before, during, or after the heating de-oiling process. The heating de-oiling process can be carried out by either (1) heating the glass yarn or glass cloth (hereinafter simply referred to as "glass" in this process) at a relatively low temperature (e.g., less than 600°C) for a long period of time (e.g., 24 hours or more), or (2) heating the glass at a relatively high temperature (e.g., 600°C to 1600°C) for a long or short period of time (e.g., less than 24 hours). From the viewpoint of obtaining glass cloth with excellent dielectric loss tangent, it is preferable to use method (2). In particular, glass cloth composed of glass yarn with a Si content of 95.0% by mass or more and 100% by mass or less in terms of SiO2 may be heated and de-oiled at a temperature of 600°C or higher. This makes it easier to lower the dielectric loss tangent of the glass cloth.

[0037] (1) When heating at a relatively low temperature, the temperature for degreasing by heating is preferably 100°C to 500°C, more preferably 250°C to 450°C, and even more preferably 350°C to 450°C. In the case of (1), the heating time for degreasing by heating can be appropriately selected, for example, preferably 24 hours to 300 hours, more preferably 48 hours to 200 hours, and even more preferably 72 hours to 150 hours. If the combination of degreasing temperature and time is within the above range, the adhesive adhering to the glass can be easily removed sufficiently.

[0038] On the other hand, (2) when heating at a relatively high temperature, the temperature for degreasing by heating is preferably 600°C to 1500°C, more preferably 800°C to 1300°C, and even more preferably 900°C to 1100°C. If the degreasing by heating temperature is 600°C or higher, organic matter such as adhesive residue adhering to the glass can be easily removed, making it easier to lower the dielectric loss tangent of the glass cloth and shortening the removal time. On the other hand, if the degreasing by heating temperature is 1500°C or lower, the devitrification phenomenon of the glass can be easily suppressed, and the reduction in strength of the glass cloth can be effectively prevented. In addition, the heating time in degreasing by heating in case (2) can be appropriately selected, for example, preferably 3 seconds to 72 hours, more preferably 3 seconds to 12 hours, even more preferably 3 seconds to 2 hours, particularly preferably 3 seconds to 10 minutes, and particularly preferably 3 seconds to 300 seconds.

[0039] In thermal degreasing, known heating methods, heating media, heating mechanisms, heating devices, and heating components can be used as heating means, as long as they allow for suitable control of the thermal degreasing temperature. For example, (1) a method of heating glass in a heating furnace, (2) a method of bringing glass into contact with a heating element, (3) a method of applying high-temperature steam to glass, etc. Heating can be carried out sequentially or continuously, in a closed system or an open system, or in a combination of a closed system and an open system.

[0040] In the case of a closed system, from the viewpoint of optimal heating by heating means, it is preferable to place the glass inside the heating furnace, and in this case, from the viewpoint of storage space and heating range, it is preferable to heat the glass cloth while storing it in a roll. Furthermore, from the viewpoint of increasing the efficiency of organic matter removal and shortening the time for organic matter removal, it is also preferable to heat the glass while transporting it inside the heating furnace.

[0041] In the case of an open system, from the viewpoint of the heated surface area, it is preferable to heat the glass while transporting it roll-to-roll. As mentioned above, the heating temperature is preferably 600°C to 1500°C, more preferably 800°C to 1300°C, and even more preferably 900°C to 1100°C. The glass can be transported, for example, by an unwinding mechanism and a winding mechanism.

[0042] Various heating means for the heating furnace include electric heaters and burners, with gas-powered single-radiant tube burners or electric heaters being preferred. Multiple means may be combined for heating.

[0043] From the viewpoint of heating efficiency, the heating furnace is preferably equipped with means for discharging the gas generated within the heating furnace and / or means for air circulation. The gas discharge means may be a nozzle, gas pipe, small hole, gas vent valve, etc. The air circulation means may be a fan, air conditioning equipment, etc.

[0044] The heating furnace may be of either a batch type, capable of housing glass (e.g., rolls of glass cloth) and heating it at a predetermined ambient temperature, or a continuous type, capable of heating the glass while continuously passing it through the heating furnace (e.g., heating while conveying it roll-to-roll). A continuous type heating furnace is preferred in order to efficiently remove organic matter adhering to the glass surface.

[0045] As a method for heating the glass, the above-mentioned heating furnace may be used, but from the viewpoint of low running costs, it may also be heated by bringing a component heated to a predetermined temperature into contact with the glass.

[0046] While the shape of the contact member is not particularly limited as long as the heating and de-oiling temperature can be appropriately controlled, a roll shape is preferred due to the ease of glass transport (heating roll method). As a member capable of heating glass in a roll shape, a roll that is heated by induction heating is preferred, as it can be used in high-temperature ranges and has relatively little temperature variation in the width direction. When heating glass with a contact member, it is assumed that the temperature of the contact member and the surface temperature of the glass are approximately equal.

[0047] As glass is continuously heated, carbides may adhere to the heating roll. To remove the carbides adhering to the heating roll, the above heating roll system preferably includes a mechanism for removing the adhering foreign matter, such as a blade.

[0048] (Surface Treatment Process) The surface treatment process can be performed on glass yarn, or on woven glass cloth. In other words, the process of weaving glass yarn to obtain glass cloth may be performed before, during, or after the surface treatment process. The surface treatment process may include, for example, a coating step of applying a silane coupling agent to the surface of the glass yarn or glass cloth (hereinafter also simply referred to as "glass" in this process) with a treatment solution with a concentration of 0.1% to 0.5% by mass. The surface treatment process may further include a fixing step of fixing the silane coupling agent to the surface of the glass by heating and drying. This makes it easier to suitably surface treat the glass.

[0049] Methods for applying the treatment solution to the glass in the coating process include (a) immersing or passing the glass through a treatment solution stored in a bath (hereinafter referred to as the "immersion method"), and (b) applying the treatment solution to the glass using a roll coater, die coater, or gravure coater. When using the immersion method, it is preferable to select an immersion time of 0.5 seconds to 1 minute for the glass in the treatment solution. When using the immersion method, the glass can be passed through the treatment solution at a transport speed of 10 m / min to 50 m / min while applying a predetermined tension to the glass (for example, 100 N to 250 N). After applying the treatment solution to the glass, the solvent contained in the treatment solution can be heated and dried using methods such as hot air or electromagnetic waves. To facilitate uniform application of the surface treatment agent to the glass surface, it is preferable to immerse the glass cloth in the surface treatment solution and then squeeze it with a rubber roller under constant pressure.

[0050] The concentration of the surface treatment agent in the treatment solution is preferably 0.1% to 0.5% by mass, more preferably 0.1% to 0.45% by mass, and even more preferably 0.1% to 0.4% by mass, based on the total mass of the treatment solution. This makes it easier to surface treat the glass more effectively.

[0051] In the fixing process, the heating and drying temperature is preferably 80°C or higher, and more preferably 90°C or higher, so that the reaction between the silane coupling agent and the glass can proceed sufficiently. Furthermore, the heating and drying temperature is preferably 300°C or lower, and more preferably 180°C or lower, in order to prevent deterioration of the organic functional groups of the silane coupling agent.

[0052] (Fiber Opening Process) The method for manufacturing glass cloth may further include a process of opening the fibers of the glass cloth. As a method for opening the fibers in the fiber opening process of glass cloth, for example, a method of opening the fibers of the glass cloth using spray water (high-pressure water opening), a vibro-washer, ultrasonic water, or a mangle can be employed. The composition of the glass cloth usually does not change before and after opening.

[0053] <Core Tube> The core tube is hollow and columnar in shape, from the viewpoint of handling during transportation and post-processing of the glass cloth. In one embodiment, the glass cloth roll can be easily transported by inserting a support rod into the hollow part of the core tube and moving the support rod. The core tube can be made of paper, resin, fiber-reinforced plastic (FRP), or metal, and from the viewpoint of preventing the incorporation of metal foreign matter into the glass cloth, paper, resin, or FRP are preferred.

[0054] <Glass Cloth Roll> A glass cloth roll includes a hollow columnar core tube and glass cloth wound around the core tube. The size of the glass cloth roll is appropriately designed according to the desired size of the glass cloth. In one embodiment, the total length in the axial direction of the glass cloth roll may be 530 mm or more, or 1280 mm or more, and in one embodiment, it may be 1500 mm or less, 1370 mm or less, or 700 mm or less. The winding width of the glass cloth (total length in the axial direction of the glass cloth) may be 500 mm or more, or 1250 mm or more, and in one embodiment, it may be 1450 mm or less, 1330 mm or less, or 660 mm or less. It is preferable that the width of the core tube that forms the axis is greater than the width of the glass cloth, and the difference between the total length in the axial direction of the roll and the winding width of the glass cloth (exposed area 111e described later) is preferably 2 cm or more, and more preferably 5 cm or more.

[0055] The roll diameter of the glass cloth roll (the outer diameter of the glass cloth when wound on the core tube) may, in one embodiment, be 200 mm or more, or 250 mm or more, and in another embodiment, it may be 700 mm or less, or 500 mm or less. The outer diameter of the core tube is preferably 100 mm or more and 400 mm or less, more preferably 120 mm or more and 350 mm or less, even more preferably 150 mm or more and 300 mm or less, and particularly preferably 150 mm or more and 250 mm or less. If the outer diameter of the core tube is above the lower limit, the bending applied to the glass cloth is reduced, making it easier to prevent damage to the wound glass cloth. Also, if the outer diameter of the core tube is below the upper limit, it is easier to reduce the volume of the glass cloth roll.

[0056] In a glass cloth roll, the difference between the roll diameter of the glass cloth roll (outer diameter of the glass cloth when wound on the core tube) D112 and the outer diameter of the core tube D111 may, in one embodiment, be 1 cm or more, or 2 cm or more, and in another embodiment, be 55 cm or less, or 50 cm or less. If the difference between the roll diameter of the glass cloth roll (outer diameter of the glass cloth when wound on the core tube) and the outer diameter of the core tube is greater than or equal to the lower limit above, it is likely that there will be a sufficient amount of glass cloth for use in the next process. Furthermore, since the sides of the glass cloth are prone to damage during packaging and transportation, the above configuration makes it easier to prevent damage to the film and cloth. Also, if the difference between the roll diameter of the glass cloth roll (outer diameter of the glass cloth when wound on the core tube) and the outer diameter of the core tube is less than or equal to the upper limit above, it becomes easier to prevent damage to the film and cloth.

[0057] The diameter (inner diameter) of the hollow portion of the core tube is preferably 30 mm or more, more preferably 50 mm or more, even more preferably 70 mm or more, and particularly preferably 75 mm or more. If the inner diameter of the core tube is greater than or equal to the lower limit above, the glass cloth is easier to handle. The upper limit of the inner diameter of the core tube is not particularly limited, but from the viewpoint of core tube strength, it is preferable that the difference between the outer diameter and inner diameter of the core tube is 5 mm or more. It is also preferable that the difference between the outer diameter and inner diameter of the core tube is 1 cm or more. By having a difference between the outer diameter and inner diameter of the core tube of 1 cm or more, it is possible to make the strength of the core tube greater than a certain level, and deformation of the core tube is less likely to occur when the glass cloth is wrapped around the core tube. From this viewpoint, the difference between the outer diameter and inner diameter of the core tube is more preferably 1.5 cm or more, even more preferably 2.0 cm or more, even more preferably 2.5 cm or more, even more preferably 3.0 cm or more, and particularly preferably 4.0 cm or more. While there is no particular upper limit to the difference between the outer and inner diameters of the core tube, it is preferable that it be 30 cm or less from the viewpoint of reducing the outer diameter of the glass cloth roll and making it easier to transport.

[0058] The weight of the glass cloth roll (core tube and glass cloth wound around the core tube) may, in one embodiment, be 5 kg or more, 10 kg or more, or 15 kg or more, and in one embodiment, it may be 300 kg or less, 250 kg or less, or 200 kg or less. If the weight of the glass cloth roll is 5 kg or more, it is likely to be a sufficient amount of glass cloth for use in the next process, and the core tube is likely to have strength suitable for packaging and transportation. Also, if the weight of the glass cloth roll is below the above upper limit, packaging and transportation are easier. The heavier the glass cloth roll, the greater the damage inflicted on the film and packaging box during packaging and transportation, but the above configuration makes it easier to prevent damage to the film and cloth.

[0059] <Film> Examples of films include ceramic vapor-deposited film, aluminum vapor-deposited film, aluminum foil, and aluminum laminate film. From the viewpoint of easily maintaining the dew point of the internal space of the glass cloth roll seal, the water vapor transmission rate of the film at a measurement temperature of 40°C and a measurement humidity of 90% Rh is preferably 8 g / (m²). 2×24hr) or less, 4g / (m 2 ×24hr) or less, 2g / (m 2 ×24hr) or less, 1g / (m 2 ×24hr) or less, 0.3g / (m 2 (×24hr) or less, or 0.1 g / (m 2 The water vapor transmission rate is 8 g / (m³) or less (×24hr). 2 By keeping the water vapor transmission rate below 24 hours (×24hr), the amount of moisture that permeates the film is reduced, making it easier to control the dew point. The lower limit of water vapor transmission rate is 0 g / (m²). 2 (×24hr) or more, for example, 0 g / (m 2 The water vapor permeability is greater than 24hr. From the viewpoint of easily satisfying the above range, aluminum foil and aluminum laminate film are preferred, and from the viewpoint of visibility during transportation and packaging, ceramic vapor-deposited film is preferred.

[0060] The thickness of the film is preferably 50 μm or more and 500 μm or less. The lower limit of the film thickness is preferably 50 μm or more, more preferably 70 μm or more, even more preferably 80 μm or more, and particularly preferably 90 μm or more. A thickness of 50 μm or more tends to reduce water vapor permeability and makes it less likely for pinholes to occur due to wrinkles or scratches. The upper limit of the film thickness is preferably 400 μm or less, 300 μm or less, 200 μm or less, or 170 μm or less. A thickness below the above upper limit can better prevent the required space from increasing due to the film becoming too bulky and can better prevent damage to the film.

[0061] The film only needs to have a shape and size that can accommodate the entire glass cloth roll, and may be, for example, tubular or bag-shaped. The smaller the surface area of ​​the film, the easier it is to maintain the dew point in the internal space of the glass cloth roll seal. Also, less excess film helps to suppress the increase in the dew point in the internal space due to damage to the film during packaging. The film surface area may be selected according to the size of the glass cloth roll, but as an example, 10 m 2 Below, 7m 2 Below, 5m 2 The following, or 4m 2The following applies: There is no particular lower limit; the size should be such that it can seal the glass cloth roll. The film surface area is measured by the method described in the [Examples] section of this disclosure. One or more rolls of glass cloth can be packed inside the film.

[0062] <Glass Cloth Roll Sealing Body> The glass cloth roll sealing body includes a glass cloth roll and a film that has an internal space and seals at least the glass cloth roll. From the viewpoint of reducing moisture absorption of the glass cloth, the dew point of the internal space is preferably 18°C ​​dp or less in one embodiment. The dew point of the internal space is preferably 15°C dp or less, 10°C dp or less, 5°C dp or less, 0°C dp or less, -5°C dp or less, -10°C dp or less, -15°C dp or less, -20°C dp or less, or -21°C dp or less. In one embodiment, the dew point of the internal space may be -50°C dp or more, -40°C dp or more, -32°C dp or more, or -30°C dp or more. The dew point of the internal space is measured by the method described in the [Examples] section of this disclosure. In one embodiment, it is preferable that the dew point of the internal space when the glass cloth roll packaging body is stored for 30 days is within the above range.

[0063] In a glass cloth roll sealed body, the dew point change rate, defined by the following formula: Dew point change rate = (Internal space dew point after 30 days of storage (°Cdp) - Initial internal space dew point (°Cdp)) / (Average external environment dew point over 30 days (°Cdp) - Internal space dew point after 30 days of storage (°Cdp)), indicates that a smaller value of this rate indicates a greater effect of controlling the storage environment by the sealed body. The above dew point change rate is evaluated as the dew point change rate of the internal space after 30 days, starting from the time when the glass cloth storage begins. Here, the time when storage begins is the time when the glass cloth roll packaging is manufactured. The dew point change rate is preferably 3.0 or less, more preferably 1.0 or less, even more preferably 0.50 or less, even more preferably 0.00 or less, particularly preferably -0.15 or less, or -0.35 or less. The dew point change rate may also be a negative value. The dew point change rate is measured by the method described in the [Examples] section of this disclosure.

[0064] As a method for controlling the dew point of the internal space within the above range, known humidity control methods, humidity control media, humidity control mechanisms, and humidity control devices can be used. For example, one or more combinations of the following can be used: (1) using a desiccant; (2) replacing the atmosphere of the internal space with a gas containing a predetermined amount of moisture (e.g., a dry gas); (3) dehumidifying the atmosphere of the internal space by utilizing condensation at low temperatures; and (4) reducing the pressure to bring the atmosphere of the internal space to a predetermined amount of moisture.

[0065] Control of the dew point in the internal space can be continuous or intermittent (for example, only on days when the dew point is likely to rise due to the season or weather). Preferred examples of continuous control include the use of desiccants, replacement with dry gas, and dehumidifiers.

[0066] The type of desiccant is not limited as long as the dew point of the internal space can be controlled within the above range. From the viewpoint of moisture absorption capacity, it is preferable that the desiccant be at least one selected from the group consisting of silica gel, magnesium chloride, calcium oxide, calcium chloride, calcined diatomaceous earth, synthetic zeolite, clay-based desiccants, phosphorus pentoxide, magnesium sulfate, copper sulfate, magnesium chloride, cobalt chloride, granular soda lime, and magnesium perchlorate. In particular, it is preferable that it be at least one selected from the group consisting of silica gel, magnesium chloride, calcium oxide, calcium chloride, and calcined diatomaceous earth. Furthermore, from the viewpoint of occupied space, it is preferable to use a thin pack-type or sheet-type desiccant.

[0067] The amount of desiccant is not limited as long as the dew point of the internal space can be controlled within the above range, but it is preferable to use an appropriate amount depending on the desiccant's moisture absorption capacity (amount of moisture absorbed and absorption time), storage period, etc. Regarding the amount of moisture absorbed, it is preferable to use a sufficient amount or more. That is, it is preferable that the maximum amount of moisture that the desiccant can absorb is greater than the amount of moisture in the atmosphere.

[0068] The amount of desiccant used becomes more important for longer storage periods. If the amount of desiccant is appropriate, it is easier to maintain the dew point in the internal space and suppress the rise in dielectric loss tangent during long-term storage. The dew point in the internal space is affected by the water vapor permeability, surface area, and material of the film, the external environment (temperature, humidity) of the glass cloth roll seal, and the type, shape, and amount of desiccant. Estimating and sealing the appropriate amount of desiccant from the start of storage to construct a glass cloth roll seal is difficult. In particular, the water vapor permeability of the film changes with the temperature and humidity of the surrounding environment, and the degree of this effect varies depending on the film material, making it more difficult to seal the appropriate amount of desiccant. However, by using the following formula, when manufacturing a glass cloth roll seal containing a desiccant, the water vapor permeability of the film, the surface area of ​​the film, and the amount of desiccant can be controlled within a predetermined range, making it easier to control the rate at which the dew point in the internal space changes in response to the external environment (dew point change rate). First, the amount of water vapor that can penetrate into a sealed container is expressed as water vapor transmission rate (WVTR) × surface area of ​​the sealed container × number of days of storage. Here, considering that WVTR changes under the influence of ambient temperature and humidity, the amount of water vapor that can penetrate into a sealed container can be simply expressed by the following formula, using WVTR as the water vapor transmission rate at a measurement temperature of 40°C and a measurement humidity of 90% Rh (dew point approximately 38°C dp): (WVTR [g / (m 2 ×24hr)]×Sealed body surface area [m 2 ]) × (External dew point of storage environment [°C dp] / 38) × (External temperature of storage environment [°C] / 40) × Number of storage days Next, the maximum amount of moisture that can be removed from inside the sealed container by the desiccant is affected by the type, shape and amount of the desiccant, but can be simply expressed by the following formula: 0.26 × Amount of desiccant enclosed [g] At this time, it is preferable that the amount of water vapor that can enter inside the sealed container is less than or equal to the maximum amount of moisture that can be removed from inside the sealed container by the desiccant, that is, that the following formula is satisfied. (WVTR [g / (m) 2 ×24hr)]×Sealed body surface area [m 2]) × (External dew point of storage environment [°Cdp] / 38) × (External temperature of storage environment [°C] / 40) × Number of storage days ≤ 0.26 × Amount of desiccant enclosed [g] Furthermore, when the external temperature of the storage environment is 30°C, the external dew point of the storage environment is 24°Cdp, and the number of storage days is 180 days, it is preferable to adjust the amount of desiccant so that the value obtained by the following formula (2) is 0.0030 or less. This makes it possible to enclose an appropriate amount of desiccant according to the configuration of the sealed body, and makes it easier to control the change in the dew point of the storage environment. WVTR [g / (m 2 ×24hr)]×Sealed body surface area [m 2 ] / Amount of desiccant enclosed [g] ... (2) (In formula (2), WVTR is the water vapor transmission rate of the film measured at a temperature of 40°C and a humidity of 90% Rh.) However, if the sealed body is composed of two or more films with different water vapor transmission rates, the "WVTR [g / (m)" in formula (2) 2 ×24hr)]×Sealed body surface area [m 2 ]" refers to "WVTR [g / (m)" for each film. 2 ×24hr)]×Sealed body surface area [m 2 The sum of the results of calculating "[ ]" is used. The value obtained by formula (2) is more preferably 0.0023 or less, even more preferably 0.0012 or less, and particularly preferably 0.0005 or less. The value obtained by formula (2) may also be 0.

[0069] When using a dry gas to control the dew point of the internal space, it is preferable to use a gas (dry gas) with a dew point temperature of 18°C ​​dp or lower. With such a dry gas, it is easy to control the atmosphere so that the dew point of the internal space is 18°C ​​dp or lower. The dew point temperature of the dry gas is preferably between -60°C dp and 18°C ​​dp. The lower limit of the dew point temperature of the dry gas may more preferably be -50°C dp or higher, -40°C dp or higher, or -30°C dp or higher. The upper limit of the dew point temperature of the dry gas may more preferably be 15°C dp or lower, 10°C dp or lower, 5°C dp or lower, 0°C dp or lower, -5°C dp or lower, -10°C dp or lower, -15°C dp or lower, -20°C dp or lower, or -21°C dp or lower.

[0070] As the dry gas, for example, dry air within the above dew point temperature range, or a gas containing at least one selected from the group consisting of nitrogen, argon, and oxygen within the above dew point temperature range, can be used. Dry air is preferred due to its ease of handling.

[0071] When using a dehumidifier to control the dew point of an internal space, the dehumidifier is not limited as long as it can control the dew point within the above range. Examples include compressor-type dehumidifiers that utilize condensation at low temperatures, and desiccant-type (zeolite-type) dehumidifiers that regenerate the desiccant agent multiple times using heat.

[0072] When using reduced pressure to control the dew point of the internal space, the internal space should be at atmospheric pressure (10 5 It is preferable to control the pressure to be less than 10 Pa. Known pressure reduction control methods, pressure reduction control media, pressure reduction control mechanisms, and pressure reduction control devices can be used for pressure reduction, for example, a vacuum pump. In one embodiment, the pressure inside the space is 10 4 Pa or less, or 10 3 It may be Pa or less, and in one embodiment, it may be greater than 0 Pa or 10 Pa or more.

[0073] <Packaging Box> Examples of packaging box materials include metal, plastic, wood, paper (cardboard, etc.), or combinations thereof. Metal, plastic, and cardboard are preferred because they are easy to reuse. From the viewpoint of saving space, the packaging box may be capable of accommodating multiple glass cloth rolls. The size of the packaging box should be appropriately designed so as to allow for a suitable distance between the axial end of the glass cloth roll and the roll-facing surface, and may be selected according to the size of the glass cloth roll. The thickness of the bottom plate, side plate, and top plate is preferably 0.3 cm or more, more preferably 0.5 cm or more, from the viewpoint of good protection of the glass cloth roll, and preferably 2 cm or less, more preferably 1.5 cm or less, from the viewpoint of transport efficiency.

[0074] In one embodiment, the difference between the inner dimensions of the packaging box in the direction corresponding to the axial direction of the glass cloth roll and the total axial length of the glass cloth roll may be more than 1 cm, or 1.5 cm or more, or 2 cm or more, or 3 cm or more, or 4 cm or more, from the viewpoint of reducing damage to the glass cloth roll and film when placing the glass cloth roll in and removing it from the packaging box. In one embodiment, it may be 15 cm or less, or 8 cm or less, from the viewpoint of reducing the size difference between the packaging box and its contents to improve transport efficiency. Furthermore, from the viewpoint of reducing damage to the film due to abrasion between the inner wall of the packaging box and the end face of the roll during transport, in one embodiment, the value obtained by dividing the difference between the inner dimensions of the packaging box in the direction corresponding to the axial direction of the glass cloth roll and the total axial length of the glass cloth roll by the thickness T of the film is preferably 110 or more, more preferably 140 or more, even more preferably 170 or more, and particularly preferably 200 or more. If the value obtained by dividing the difference between the inner dimensions of the packaging box in the direction corresponding to the axial direction of the glass cloth roll and the total axial length of the glass cloth roll by the thickness of the film is equal to or greater than the lower limit above, then excessive bending and abrasion forces will not be applied to the film between the inner wall of the packaging box and the end face of the roll, and damage to the film can be prevented more effectively. Although not particularly limited, the value obtained by dividing the difference between the inner dimensions of the packaging box in the direction corresponding to the axial direction of the glass cloth roll and the total axial length of the glass cloth roll by the thickness of the film should be 3000 or less, or 2000 or less.

[0075] [Overall Configuration] Figure 1A is a front view of a glass cloth roll packaging body 1 according to an example of this embodiment, viewed in the direction of the glass cloth roll axis, and Figure 1B is a front view of the glass cloth roll packaging body 1 of Figure 1A, viewed in the direction of the glass cloth roll diameter. Figure 2A is a front view of a glass cloth roll packaging body 2 according to an example of this embodiment, viewed in the direction of the glass cloth roll axis, and Figure 2B is a front view of the glass cloth roll packaging body 2 of Figure 2A, viewed in the direction of the glass cloth roll diameter. Referring to Figures 1A, 1B, 2A, and 2B, the glass cloth roll packaging bodies 1 and 2 comprise a glass cloth roll sealing body 10 and a packaging box 20 having internal dimensions of height H, width W1, and depth W2 for housing the glass cloth roll sealing body 10. The glass cloth roll sealing body 10 includes a glass cloth roll 11 and a film 12 that has an internal space S and seals at least the glass cloth roll 11. The glass cloth roll 11 includes a hollow columnar core tube 111 having a hollow portion 111a, and glass cloth 112 wound around the core tube 111. The glass cloth 112 is composed of glass threads (not shown) containing multiple filaments as warp and weft threads. In one embodiment, the dew point of the internal space S is 18°C ​​dp or less.

[0076] The packaging box 20 has a bottom plate 21, a top plate 22, and side plates 23. The side plates 23 have roll-facing surfaces 23S that face the axial end face 11S of the glass cloth roll 11. The axial end face 11S is the most protruding part of the glass cloth roll 11 when viewed in the direction of the roll axis (such a part is a surface in a normal glass cloth roll). The roll-facing surface 23S that faces the axial end face 11S is a surface that faces at least a part of the axial end face 11S parallel or inclined (in one embodiment, at an inclination angle of less than 45° with respect to parallel).

[0077] [Roll-facing surface] In one embodiment, the roll-facing surface 23S satisfies at least one of the following (1) and (2): (1) At least one of the roll-facing surfaces 23S is movable relative to the bottom plate 21 (Figures 1A, 1B), and (2) At least one of the roll-facing surfaces 23S is separated from the axial end face 11S of the glass cloth roll 11 with the shortest possible gap distance GD (Figure 2A). Both of these configurations contribute to reducing damage to the glass cloth roll seal, especially the film, and therefore contribute to suppressing the increase in dielectric loss tangent during storage of the glass cloth.

[0078] In a typical embodiment, there is a pair of roll-facing surfaces 23S corresponding to a pair of axial end faces 11S of a single glass cloth roll 11, but at least one (i.e., one side) of such a pair of roll-facing surfaces 23S satisfies (1) and / or (2) above. In this case, the advantages of the present invention can be obtained in cantilever transport of a glass cloth roll using a support rod. In a preferred embodiment, both of such a pair of roll-facing surfaces 23S may satisfy (1) and / or (2) above.

[0079] Furthermore, when multiple glass cloth rolls are contained in a single packaging box, the relationship between each glass cloth roll and its corresponding roll-facing surface is intended to satisfy either (1) or (2) above.

[0080] Regarding (1) above, being movable means that the distance and direction of the roll-facing surface 23S relative to the bottom plate 21 can be changed. Therefore, in the embodiment of (1) above, there is no minimum gap distance GD between the roll-facing surface 23S and the axial end face 11S of the glass cloth roll 11, as in the embodiment of (2) above (i.e., since the roll-facing surface is movable, the distance between the roll-facing surface 23S and the axial end face 11S can range from zero to infinity). Figures 1A and 1B show an example in which the roll-facing surface 23S is movable relative to the bottom plate 21 by the bottom plate 21 and the side plate 23 being detachable from each other, but the movable embodiment is not limited to this. For example, the surface of the side plate 23 including the roll-facing surface 23S may be connected to or integrated with the bottom plate 21, and the surface including the roll-facing surface 23S may be rotatable about one side of the bottom plate 21 as an axis. A movable side plate can be installed even when the glass cloth roll is already placed on the bottom plate. Such add-on side panels are advantageous in reducing damage to the glass cloth rolls and film, as they prevent the glass cloth rolls, especially their axial ends, from interfering with the packaging box during packaging.

[0081] In one embodiment, the shortest distance SD between the axial end face 11S and the roll-facing surface 23S with the side plate installed may be 10 cm or less, 6 cm or less, or 4 cm or less, from the viewpoint of obtaining good transport efficiency by preventing the volume of the package from becoming excessive, and from the viewpoint of reducing damage to the glass cloth roll and / or film due to axial movement of the glass cloth roll (also referred to as lateral displacement in this disclosure). Furthermore, in one embodiment, from the viewpoint of reducing damage to the film sandwiched between the axial end face 11S and the roll-facing surface 23S during transport, and from the viewpoint of ensuring the airtightness of the box, it may preferably be more than 0.3 cm, more preferably more than 0.5 cm, even more preferably 0.8 cm or more, or 1 cm or more. Furthermore, from the viewpoint of reducing film damage due to abrasion between the inner wall of the packaging box and the roll end face, especially during transportation, in one embodiment, the value obtained by dividing the shortest distance SD between the axial end face 11S and the roll-facing surface 23S with the side plate installed by the film thickness T is preferably 55 or more, more preferably 70 or more, even more preferably 85 or more, and particularly preferably 100 or more. If SD / T is equal to or greater than the above lower limit, it is possible to prevent excessive bending and abrasion forces from being applied to the film between the inner wall of the packaging box and the roll end face, thereby preventing film damage more effectively. Although not particularly limited, the value obtained by dividing the shortest distance SD between the axial end face 11S and the roll-facing surface 23S with the side plate installed by the film thickness T may be 1500 or less, or 1000 or less.

[0082] Regarding (2) above, in one embodiment, the minimum gap distance GD is greater than 5 mm. In one embodiment, the minimum gap distance GD is a value such that the minimum gap distance GD and the film thickness T satisfy the formula: GD ≥ T × 60. The minimum gap distance GD means the minimum distance between any part of the axial end face 11S and any part of the roll-facing face 23S. Even when the bottom plate 21 and the side plate 23 are fixed to each other, a gap is secured between the glass cloth roll and the packaging box by having the minimum gap distance GD greater than 5 mm or satisfying GD ≥ T × 60 (i.e., the ratio of the minimum gap distance GD to the film thickness T is 60 or more). This makes it less likely for the glass cloth roll to interfere with the packaging box when the glass cloth roll is placed on the bottom plate 21.

[0083] With respect to (2) above, in one embodiment, the minimum gap distance GD is greater than 5 mm, or 1 cm or more, or 1.5 cm or more, or 2 cm or more. From the viewpoint of obtaining good workability for sealing the film during packaging, and from the viewpoint of reducing damage to the glass cloth roll and film, it is preferable that the minimum gap distance GD is large. From the viewpoint of obtaining good transport efficiency by not making the volume of the package excessive, and from the viewpoint of reducing damage to the glass cloth roll and / or film due to axial movement of the glass cloth roll (also referred to as lateral displacement in this disclosure), in one embodiment, the minimum gap distance GD may be 10 cm or less, or 6 cm or less, or 4 cm or less.

[0084] In one embodiment, the ratio of the shortest gap distance GD to the film thickness T is 60 or more, or 90 or more, or 120 or more. From the viewpoint of reducing damage to the glass cloth roll and film, a larger ratio is preferable, but from the viewpoint of transportation efficiency, in one embodiment, the ratio is 1500 or less, or 1000 or less, or 500 or less, or 200 or less.

[0085] As shown in Figure 5 described later, when the support is located inside the glass cloth roll seal, the shortest gap distance GD between the roll-facing surface and the axial end surface of the glass cloth roll is preferably 1 cm or more, more preferably 3 cm or more, and particularly preferably 5 cm or more. For example, in a sealing configuration in which a support is placed inside a film, the film is pushed down sufficiently to expose the notch of the support, a glass cloth roll is placed on the support, the film is pushed up, and the opening of the film is sealed by heat sealing or the like, the space required for raising and lowering the film and sealing the opening is relatively large. From the above viewpoint, when the support is located inside the glass cloth roll seal, it is advantageous for the shortest gap distance GD to be relatively large, and preferably 5 cm or more.

[0086] On the other hand, as shown in Figure 6 described later, when the support is located on the outside of the glass cloth roll seal, the minimum gap distance GD is preferably 1 cm or more, or 2 cm or more. In one embodiment, the support and the roll-facing surface may be in contact without a film in between. In this case, damage to the film can be reduced more effectively. For example, in a packaging configuration in which the side plate has a slit, the opening of the film is brought out through the slit, the opening is sealed while it is coming out of the slit, and then the sealed part is stored in the slit, the space required for the sealing operation of the film opening is relatively small. From the above viewpoint, when the support is located on the outside of the glass cloth roll seal, workability can be good even if the minimum gap distance GD is relatively small.

[0087] Referring to Figures 2A and 2B, in one embodiment of the side plate 23, the surface having at least one of the roll-facing surfaces 23S may have a notch 23a with a width W23a that is 50% or more of the inner diameter D111a of the core tube 111. In this case, the glass cloth roll 11 can be placed on the bottom plate 21 by inserting the support rod into the notch 23a while the glass cloth roll 11 is supported by the support rod (sliding it from top to bottom in one embodiment). The width W23a should be such that the support rod can be inserted into the notch, but from the viewpoint of preventing the glass cloth roll sealing body from sliding out of the notch 23a, it is preferably less than the outer diameter D112 of the glass cloth 112 wound around the core tube 111, or less than the outer diameter D111 of the core tube 111, or 90% or less of the outer diameter D111, or 80% or less.

[0088] [Support] Glass cloth is inherently brittle and easily damaged by vibration, friction, etc. during transportation. Damage is particularly pronounced when the silicon (Si) content in the glass yarn is 95.0% to 100% by mass in terms of silicon dioxide (SiO2). Furthermore, because the moisture-proof film is thick and rigid, damage is likely to become more pronounced when weight is applied to the contact area while the glass cloth is in contact with the film in the packaging. Therefore, in one preferred embodiment, the glass cloth roll is arranged so that the glass cloth is suspended in the packaging box. Figure 3A is a front view of the support and glass cloth roll according to the exemplary embodiment, viewed in the direction of the glass cloth roll axis, and Figure 3B is a front view of the support and glass cloth roll of Figure 3A, viewed in the direction of the glass cloth roll diameter. In one embodiment, the support may have at least one pair of support plates 31 having a notch 31a extending downward from the upper end. The pair of support plates 31 may be fixed vertically spaced apart from each other. For example, such separation and vertical fixing are possible with the fixing part 32. Vertical positioning most typically means that the angle between the surface of the bottom plate and the surface of the support plate is 90°, but is not limited to this, and in one embodiment the angle may be 45° or more and 90° or less. In one embodiment the core tube 111 may have a pair of exposed regions 111e at both axial ends on which the glass cloth 112 is not wound. In this case the glass cloth roll may be supported by the support at the exposed regions 111e. For example the glass cloth roll may be supported by the support by placing each of the pair of exposed regions 111e on each of the notches 31a.

[0089] Each pair of support plates 31 may consist of one or more plates. For example, the number of support plates may be increased if the axial length of the exposed area 111e is long, and the thickness and number of support plates may be adjusted as appropriate according to the size of the glass cloth roll and the packaging box.

[0090] When multiple glass cloth rolls are housed in a single packaging box, multiple pairs of support plates, one or more plates per pair, may be arranged. In a preferred embodiment, one glass cloth roll is supported per pair of support plates, from the viewpoint of reducing damage to the glass cloth rolls and film.

[0091] Figure 4A is a front view of the support and glass cloth roll according to the exemplary embodiment, viewed in the glass cloth roll axial direction; Figure 4B is a front view of the support of Figure 4A, viewed in the glass cloth roll radial direction; and Figure 4C is a front view of the support and glass cloth roll of Figure 4A, viewed in the glass cloth roll radial direction. In one embodiment, the support has a pair of support plates 33 having cutouts 33a, and the glass cloth roll may be supported by the support by the support when the support plates 33 are placed vertically with each of the pair of exposed regions 111e inserted axially into each of the cutouts 33a. In one preferred embodiment, the cutouts 33a are circular, but are not limited thereto. The diameter of the cutouts 33a only needs to be large enough to insert the core tube 111, and in one embodiment, it may be 100% or more, or 105% or more, of the outer diameter of the core tube 111. From the viewpoint of enabling the support plate 33 to stand on its own simply by the glass cloth roll being inserted into the support plate 33, the diameter of the cutout portion 33a is, in one embodiment, 130% or less, or 110% or less, of the outer diameter of the core tube 111.

[0092] Figure 5 is a front view of the film, the support inside the film, and the glass cloth roll according to the exemplary embodiment, viewed in the direction of the glass cloth roll axis, and Figure 6 is a front view of the film, the support outside the film, and the glass cloth roll according to the exemplary embodiment, viewed in the direction of the glass cloth roll axis. When a support such as a support plate 31 is used, the support may be sealed together with the glass cloth roll 11 in the film 12, as shown in Figure 5, or it may support the film 12 and the glass cloth roll 11 contained therein, as shown in Figure 6. When a support such as a support plate 33 is used, it is preferable from the viewpoint of reducing film damage that the support be sealed together with the glass cloth roll 11 in the film 12.

[0093] As shown in Figure 5, when the support is located inside the glass cloth roll seal, the shortest distance D between each of the roll-facing surfaces and the support may, in one embodiment, be 1 cm or more, 3 cm or more, or 5 cm or more. If the shortest distance D is 1 cm or more, the box and the film are less likely to interfere when the glass cloth roll seal is placed in the box, thus making it easier to prevent damage to the glass cloth and film, and if the film has a side opening, it is easier to seal the side opening during transport of the glass cloth roll seal. Also, if the shortest distance D is 1 cm or more, the film is more likely to fit between the roll-facing surfaces and the support, making it easier to ensure the airtightness of the box. Also, if the shortest distance D is 3 cm or more, if the film has an upper opening, it is easier to push up the portion that was previously pushed down towards the bottom plate. From the viewpoint of reducing the movement of the support in the glass cloth roll axis direction (i.e., lateral displacement of the support) during transport of the glass cloth roll, the shortest distance D may, in one embodiment, preferably be 15 cm or less, more preferably 10 cm or less, even more preferably 8 cm or less, and particularly preferably 6 cm or less.

[0094] Alternatively, as shown in Figure 5, if the support is located inside the glass cloth roll sealing body, it is preferable that at least one of the roll-facing surfaces 23S is movable relative to the bottom plate 21. For example, in a sealing configuration in which a support is placed inside a film, the film is pressed down sufficiently to expose the notch of the support, a glass cloth roll is placed on the support, the film is pushed up, a side plate is installed, and the opening of the film is sealed by heat sealing or the like, having the roll-facing surfaces movable relative to the bottom plate makes it easier to secure the space necessary for raising and lowering the film and sealing the opening. At this time, each of the roll-facing surfaces can be said to be movable relative to the support, and it is preferable that at least one of the roll-facing surfaces is movable relative to the support, as this makes it easier to secure the space necessary for raising and lowering the film and sealing the opening.

[0095] The width of the slit is preferably 50% or more of the inner diameter of the core tube. This makes it easier to insert a support rod capable of transporting the roll from the side. The width of the slit is preferably 70% or more, more preferably 90% or more, and even more preferably 100% or more of the inner diameter of the core tube. In addition, to prevent the core tube from shifting laterally, the width of the slit is preferably smaller than the outer diameter of the core tube. The width of the slit is preferably 90% or less, more preferably 80% or less, and even more preferably 70% or less of the outer diameter of the core tube.

[0096] <Cushioning Material> The glass cloth roll packaging may be further equipped with cushioning material. There are no particular restrictions on the material of the cushioning material, but examples include expanded polystyrene, polyethylene sheet, urethane foam, bubble wrap, air pillow, and loose cushioning material. Expanded polystyrene, polyethylene sheet, and urethane foam are preferred from the viewpoint of processability and strength.

[0097] Figures 7A, 78, and 79 are front views of the cushioning material, support, and glass cloth roll according to the exemplary embodiment, viewed in the direction of the glass cloth roll axis, and Figure 7B is a front view of the cushioning material, support, and glass cloth roll of Figure 7A, viewed in the direction of the glass cloth roll diameter.

[0098] Referring to Figures 7A and 7B, a glass cloth roll packaging according to one embodiment may further include a cushioning material 41 (also referred to in this disclosure as a support cushioning material) positioned between the notch 31a of the support and the exposed area 111e. Such a cushioning material is advantageous in reducing damage to the glass cloth roll due to vibration, and is particularly advantageous in reducing damage to the film when the support is located outside the sealing body.

[0099] Referring to Figure 8, a glass cloth roll packaging according to one embodiment may further include a cushioning material 42 (hereinafter also referred to as a side cushioning material) positioned between the roll-facing surface and the axial end surface of the glass cloth roll. Such a cushioning material functions as a stopper to reduce lateral displacement of the glass cloth roll. In a preferred embodiment, the cushioning material 42 can be attached and detached without removing the glass cloth roll while the glass cloth roll packaging is housed in the packaging box, that is, while the side plate is installed if the side plate is movable. In one embodiment, the cushioning material 42 may not be interposed between the support and the side plate. The cushioning material 42 is preferably less than or equal to the shortest distance SD between the axial end surface and the roll-facing surface when the side plate is installed, and more preferably less than or equal to SD-5 mm. It is also preferably less than or equal to SD-15 mm, and more preferably less than or equal to SD-10 mm. This makes it easier to achieve both prevention of damage to the film and reduction of end damage due to lateral displacement of the glass cloth. Furthermore, the cushioning material 42 only needs to be present in at least a portion of the space between the roll-facing surface and the axial end surface of the glass cloth roll.

[0100] Referring to Figure 9, a glass cloth roll packaging according to one embodiment may further include a cushioning material 43 (hereinafter also referred to as a cloth end face cushioning material) arranged on an exposed area 111e along the roll axial end face of the glass cloth within the glass cloth roll sealing body. Such a cushioning material is advantageous in reducing damage to the glass cloth, particularly damage due to lateral displacement.

[0101] <Other Components> The glass cloth roll packaging of this embodiment may further include elements other than those described above. For example, the glass cloth roll packaging may further include a desiccant placed between the glass cloth roll seal and the packaging box. Such a desiccant contributes to further reducing the intrusion of moisture into the glass cloth roll seal.

[0102] ≪Method for Manufacturing Glass Cloth Roll Packaging≫ One aspect of the present invention also provides a method for manufacturing the glass cloth roll packaging according to this disclosure. The structure of the glass cloth roll packaging according to this disclosure has the unique advantage of being able to suppress damage to the film during packaging. Several examples of methods for manufacturing glass cloth roll packaging are shown below, but the manufacturing method is not limited to these.

[0103] <Procedure Example A> - Use a packaging box 20 in which a side plate 23 with a slit-shaped notch 23a is integrated with a bottom plate 21, as shown in Figure 2. - Place the glass cloth roll 11 and desiccant inside the tubular film 12 so that the end in the roll axis direction becomes the film opening. - Insert a support rod into the hollow part of the core tube from the film opening at one end in the roll axis direction to create a cantilevered state. - Transport the glass cloth roll 11 in the cantilevered state, insert the support rod into the slit of the side plate from above, and place the glass cloth roll 11 on the bottom plate 21. - Remove the support rod from the core tube. - Set the internal space S to a predetermined dew point. - Heat seal the opening of the film 12 with a heat sealer. - Place the top plate 22 over the side plate 23.

[0104] <Procedure Example B> - Use a packaging box 20 having side plates 23 that are movable relative to the bottom plate 21, as shown in Figure 1. - Place the glass cloth roll 11 and desiccant inside the tubular film 12 so that the end in the roll axis direction becomes the film opening. - Insert a support rod into the hollow part of the core tube from the film opening at one end in the roll axis direction to create a cantilevered state. - Transport the glass cloth roll in the cantilevered state and place the glass cloth roll 11 on the bottom plate 21. - Remove the support rod from the core tube. - Set the internal space S to a predetermined dew point. - Heat seal the opening of the film 12 with a heat sealer. - Place the side plate 23 on the bottom plate 21. - Place the top plate 22 over the side plate 23.

[0105] <Procedure Example C> - Use a packing box 20 in which a side plate 23 with a slit-shaped notch 23a, as shown in Figure 2, is integrated with a bottom plate 21. - Referring to Figures 2, 3A, and 3B, place the support plate 31 shown in Figures 3A and 3B on the bottom plate 21. If necessary, place the support cushioning material 41 on the notch 31a of the support plate 31. - Place the glass cloth roll 11 and desiccant inside the tubular film 12 so that the end in the roll axis direction becomes the film opening. - Insert the support rod into the hollow part of the core tube from the film opening at one end in the roll axis direction to create a cantilevered state. - Transport the glass cloth roll in the cantilevered state, insert the support rod into the slit of the side plate from above, and place the glass cloth roll 11 on the notch 31a of the support plate 31. - Remove the support rod from the core tube. - Set the internal space S to a predetermined dew point. - Heat seal the opening of the film 12 with a heat sealer. - Place the top plate 21 over the side plate 23.

[0106] <Procedure Example D> - Use a packing box 20 in which a side plate 23 with a slit-shaped notch 23a is integrated with a bottom plate 21, as shown in Figure 2. - Spread the bag-shaped film 12 on the bottom plate 21. - Place the support plate 31 shown in Figures 3A and 3B on the film 12. At this time, push down the film so that the notch 23a of the side plate and the notch 31a of the support plate 31 are exposed when viewed from the side. - Insert a support rod into the hollow part of the core tube from one end of the glass cloth roll 11 in the roll axis direction to create a cantilevered state. If necessary, attach a cloth end face cushioning material along the cloth end face. - Transport the glass cloth roll 11 in the cantilevered state, insert the support rod into the notch 23a of the side plate from above, and place the glass cloth roll 11 on the notch 31a of the support plate 31. - Remove the support rod from the core tube. - Pull up the opening of the film 12 to the top of the glass cloth roll 11 and put a desiccant inside. If necessary, attach side cushioning material between the roll-facing surface and the axial end surface of the glass cloth roll. - Set the internal space S to a predetermined dew point. - Heat-seal the opening of the film 12 with a heat sealer. - Place the top plate 22 over the side plate 23.

[0107] <Procedure Example E> - Use a packaging box 20 having side plates 23 that are movable relative to the bottom plate 21, as shown in Figure 1. - Spread the bag-shaped film 12 on the bottom plate 21. - Insert a support rod into the hollow part of the core tube from one end of the glass cloth roll 11 in the roll axis direction to create a cantilevered state. - Transport the glass cloth roll 11 in the cantilevered state. Place the glass cloth roll 11 on the film 12 with the cutouts 33a of the support plate 33, which has circular cutouts 33a as shown in Figures 4A to 4C, inserted into each of the axial ends of the glass cloth roll 11. This supports the glass cloth roll 11 with the support plate 33 on the bottom plate 21. - Remove the support rod from the core tube. - Pull up the opening of the film 12 to the top of the glass cloth roll 11 and put a desiccant inside. - Install the side plates 23. - Set the internal space S to a predetermined dew point. - Heat seal the opening of the film 12 with a heat sealer. - Place the top plate 22 over the side plate 23.

[0108] <Procedure Example F> - Use a packaging box 20 having side plates 23 that are movable relative to the bottom plate 21, as shown in Figure 1. - Spread the bag-shaped film 12 on the bottom plate 21. - Place the support plate 31 shown in Figures 3A and 3B on the film 12. At this time, push down the film 12 so that the notch 31a of the support plate 31 is exposed when viewed from the side. - Insert a support rod into the hollow part of the core tube from one end of the glass cloth roll 11 in the roll axis direction to create a cantilevered state. - Transport the glass cloth roll 11 in the cantilevered state and place the glass cloth roll 11 on the notch 31a of the support plate 31. - Remove the support rod from the core tube. - Pull up the opening of the film 12 to the top of the glass cloth roll 11 and put a desiccant inside. - Install the side plate 23. - Set the internal space S to a predetermined dew point. - Heat seal the opening of the film 12 with a heat sealer. - Place the top plate 22 over the side plate 23.

[0109] <Procedure Example G> - Use a packing box 20 as shown in Figure 1, which has side plates 23 that are movable relative to the bottom plate 21. - Place the support plates 31 shown in Figures 3A and 3B on the bottom plate 21. If necessary, place the support cushioning material 41 on the notch 31a of the support plate 31. - House the glass cloth roll 11 and desiccant inside the tubular film 12 so that the end in the roll axis direction becomes the film opening. - Insert the support rod into the hollow part of the core tube from the film opening at one end in the roll axis direction to create a cantilevered state. - Transport the glass cloth roll 11 in the cantilevered state and place the glass cloth roll on the notch 31a of the support plate 31. - Remove the support rod from the core tube. - Set the internal space S to a predetermined dew point. - Heat seal the opening of the film 12 with a heat sealer. - Install the side plates 23. - Place the top plate 22 over the side plates 23.

[0110] ≪Method for Storing Glass Cloth Rolls≫ One aspect of the present invention also provides a method for storing glass cloth rolls, which includes storing the glass cloth rolls in the glass cloth roll packaging of the present disclosure. In the glass cloth storage method, it is preferable that the average dew point of the internal space of the glass cloth roll seal during the storage period (also referred to as the average dew point in this disclosure) is within the range exemplified in this disclosure as the dew point of the internal space. Therefore, in one aspect, it is preferable that the average dew point of the internal space is 18°Cdp or less. In this case, the dew point of the internal space may exceed 18°Cdp for part of the storage period. Preferably, the dew point of the internal space is maintained at 18°Cdp or less throughout the entire storage period. Another aspect of the present invention also provides a method for storing glass cloth rolls, which includes storing the glass cloth rolls after they have been transported in the glass cloth roll packaging of the present disclosure. In this case, the storage period includes the period of transport.

[0111] In the glass cloth roll storage method of this embodiment, there are no particular restrictions on the average dew point of the external environment, and as an example, it may be in the range of 23°C dp to 35°C dp.

[0112] The average temperature around the glass cloth roll packaging during storage (hereinafter also referred to as the average temperature) is preferably 100°C or less. In this case, the increase in the dielectric loss tangent of the glass cloth over time can be suppressed. The average temperature is more preferably 50°C or less, 40°C or less, 35°C or less, 30°C or less, or 25°C or less. In one embodiment, the average temperature may be 0°C or higher, 10°C or higher, or 20°C or higher. In a preferred embodiment, the temperature around the glass cloth roll packaging may be maintained within the range exemplified as the average temperature above throughout the entire storage period.

[0113] The period during which glass cloth rolls are stored in their glass cloth roll packaging (i.e., the storage period) is not particularly limited, but from the viewpoint of reducing the time required for transporting the glass cloth and improving supply stability, it is preferably 30 days to 5 years. The lower limit of the storage period is preferably 30 days or more, more preferably 90 days or more, even more preferably 180 days or more, even more preferably 365 days or more, and particularly preferably 730 days or more. Furthermore, from the viewpoint of reducing storage costs, the upper limit of the storage period for glass cloth is preferably 5 years or less, more preferably 3 years or less. If the storage period is within the above range, the effect of the glass cloth packaging of this disclosure is good. The longer the storage period, the more pronounced the effect of suppressing the rise in dielectric loss tangent by the storage method of this embodiment becomes.

[0114] In one embodiment of the storage method, the dielectric loss tangent rate of change of the present disclosure may be within the range exemplified in the present disclosure under the actual storage conditions (temperature and external environmental dew point) of the glass cloth roll packaging. Also, in one embodiment of the storage method, the dew point change rate of the present disclosure may be within the range exemplified in the present disclosure under the actual storage conditions (temperature and external environmental dew point) of the glass cloth roll packaging.

[0115] The following describes exemplary embodiments of the present invention with reference to examples, but the present invention is not limited to these embodiments.

[0116] ≪Evaluation Method≫ <Glass Cloth> [Balance Weight (Cloth Weight)] The basis weight of the glass cloth was determined by cutting the glass cloth to a predetermined size and dividing its weight by the sample area. In this example or comparative example, the glass cloth was 10 cm 2 The process of cutting the glass cloth to the specified size and measuring its weight was repeated 10 times, and the average value was used as the basis weight for each piece of glass cloth.

[0117] [Method for measuring the thickness of glass cloth] The thickness of the glass cloth was determined in accordance with JIS R 3420, 7.10. Specifically, a micrometer was used, and the spindle was rotated gently and lightly brought into contact with the sample's surface parallel to the surface being measured. The scale was then read after the ratchet clicked three times. Note that JIS R 3420, 7.10 specifies general test methods for cloth products such as glass cloth.

[0118] [Converted Thickness] Glass cloth is a discontinuous planar material with air between the glass fibers. Therefore, the converted thickness was calculated by dividing the basis weight (mass of the cloth) of each glass cloth by the density of the glass. Specifically, the following formula: Converted thickness (μm) = basis weight (g / m) 2 )÷Density (g / cm 3 The converted thickness was calculated using the following method. This converted thickness value was used for measurement using the resonance method.

[0119] [Dielectric Loss Tangent] The dielectric loss tangent of each glass cloth was determined in accordance with IEC 62562. Specifically, glass cloth samples, sampled to the size required for measurement in a split-cylinder resonator, were stored in a constant temperature and humidity oven at 23°C and 50% RH for at least 8 hours. After storage, the dielectric properties at 10 GHz were measured for the samples using a split-cylinder resonator (EM Labs) and an impedance analyzer (Agilent Technologies). Measurements were performed five times for each sample, and the average value was calculated. The above-mentioned converted thickness was used as the thickness of each sample. Note that IEC 62562 mainly specifies a method for measuring the dielectric properties in the microwave band of fine ceramic materials used in microwave circuits.

[0120] [Loss on Ignition] The loss on ignition of the glass cloth was determined in accordance with JIS R3420. Specifically, the glass cloth was dried in a dryer at 105°C ± 5°C for 60 minutes, then transferred to a desiccator and allowed to cool to room temperature. After cooling, the weight of the glass cloth was measured to the nearest 0.1 mg (weight of glass cloth a). Next, the glass cloth was heated at 380°C for 2 hours, then transferred to a desiccator and allowed to cool to room temperature. After cooling, the weight of the glass cloth was measured to the nearest 0.1 mg (weight of glass cloth after heat treatment b). The weight lost due to the heat treatment was then determined, and the loss on ignition (%) was calculated using the following formula: Loss on ignition (%) = (a - b) / a × 100

[0121] <Internal Space and External Environment> [Temperature and Dew Point] Temperature and dew point were measured using a Vaisala DM70 handheld dew point meter. Depending on the dew point to be measured, a DMP74A probe or a DMP74B probe and an MI70 indicator were used to measure the dew point under ambient pressure. Specifically, the DMP74A probe was used when the dew point exceeded -30°C dp, and the DMP74B probe was used when the dew point was below -30°C dp. For the internal space, the initial temperature and dew point at the start of storage, and the temperature and dew point after 30 days of storage were measured. Temperature and dew point were also measured for the external environment.

[0122] [Pressure in the internal space] The pressure in the internal space of the glass cloth roll packaging was measured using a container pressure measuring device while the packaging was placed in an environment of 20°C and atmospheric pressure.

[0123] <Film> [Water Vapor Permeability] Film thickness and water vapor permeability were measured in accordance with JIS K7130 and JIS K7129-1. Measurements were performed three times for each sample, and the average values ​​were taken as the film thickness T and water vapor permeability. Test pieces were selected to be free of wrinkles, folds, or pinholes, and to have a uniform thickness, as visually inspected. • Equipment: Water vapor permeability meter L80-5000 (Lyssy, ISO-PE-Z91) • Thickness gauge: ID-C1012C (Mitutoyo, ISO-PE-Z78) • Temperature and humidity: 40°C, 90% Rh • Measurement area: Approximately 50 cm² 2• Reference sample: PET 19 μm thickness (25.5 g / m²) 2 ×24hr)) ・Measurement direction: Transmitted from the side that will be the outside when the glass cloth roll is packaged.

[0124] [Film Surface Area] The surface area was calculated after measuring the film size.

[0125] [Film Visibility] A piece of paper with writing on it was placed inside the film and brought into contact with the film. If the writing could be identified from the outside, it was deemed visible; if not, it was deemed illegible.

[0126] <Measurement Method for Various Lengths> A ruler was placed at the measurement position and the values ​​were read. (Details) ・Roll diameter (mm), total length in the axial direction of the roll (mm) ・Core tube outer diameter (mm), inner diameter (mm) ・Box width (mm), inner dimensions of the packaging box (mm), cardboard thickness (mm) ・Minimum gap distance GD (cm) ・Shortest distance between the axial end face 11S and the roll opposing surface 23S with the side plate installed (cm) ・Shortest distance D between each of the roll opposing surfaces and the support (cm) ・Slit width, film size In addition, the following were calculated based on the obtained values: ・Difference between roll diameter and core tube outer diameter (cm) ・Difference between inner dimensions of the packaging box and total length in the axial direction of the roll (cm) ・Ratio of slit width to core tube inner diameter (%)

[0127] <Method for measuring the weight of glass cloth rolls> The glass cloth roll (glass cloth wound around a core tube) was placed on a scale and its weight was measured.

[0128] <Glass Cloth Roll Packaging> [Packaging Workability] The workability of the film sealing operation during packaging was evaluated according to the following criteria: A: Side plates are movable (the shortest gap distance is indicated as infinity ∞ in the table for convenience) B: Shortest gap distance GD is 10 cm or more C: Shortest gap distance GD is 5 cm or more and less than 10 cm D: Shortest gap distance GD is 2 cm or more and less than 5 cm E: Shortest gap distance GD is less than 2 cm N: No film sealing operation

[0129] [Box Sealing Performance] Because the film is bulky, if the size of the packaging box is inappropriate, in particular, if the distance SD between the roll-facing surface and the axial end face of the glass cloth roll, or the distance D between the roll-facing surface and the support plate is insufficient, the side plates may not be able to contact the bottom or top plate, resulting in a situation where the packaging box cannot be sealed. Box sealing performance was evaluated according to the following criteria: A: The bottom plate and side plates of the packaging box, and the side plates and top plate are in contact with each other with no gaps. B: The bottom plate and side plates, and / or the side plates and top plate of the packaging box are separated, with gaps.

[0130] [Transportation Efficiency] This shows the difference between the internal dimensions of the packaging box and the total length in the direction of the roll. A smaller value indicates better transportation efficiency.

[0131] [Film Damage] An opening was made in the film at one end of the glass cloth roll seal in the roll axis direction from the packaging box. A support rod was inserted into the hollow core tube through this opening, and the seal was removed in a cantilevered state and placed on a workbench. The glass cloth roll seal was visually inspected, and damage to the side of the film (the part facing the roll's opposing surface) and the support part (the part facing the support) was evaluated according to the following criteria. (Side sections) A: No pinholes or tears, and whitening due to bending or compression covers 10% or less of the side section area. B: No pinholes or tears, and whitening due to bending or compression covers more than 10% but 20% or less of the side section area. C: No pinholes or tears, and whitening due to bending or compression covers more than 20% but 30% or less of the side section area. D: No pinholes or tears, and whitening due to bending or compression covers more than 30% of the side section area. E: One pinhole or tear present. F: Two or more pinholes or tears present. (Support sections) A: No pinholes or tears, and whitening due to bending or compression covers 10% or less of the support section area. B: No pinholes or tears, and whitening due to bending or compression covers more than 10% but 20% or less of the support section area. C: No pinholes or tears, and whitening due to bending or compression covers more than 20% but 30% or less of the support section area. D: 1 to 3 pinholes or tears, or whitening due to bending or compression covering more than 30% of the support area. E: 4 or more pinholes or tears.

[0132] [Damage to the glass cloth] Following the evaluation in the [Damage to the film] section above, the glass cloth roll was removed from the glass cloth roll seal using a support rod. Damage to the glass cloth was evaluated according to the following criteria. Damage to the glass cloth surface was evaluated by unwinding the glass cloth six times on a roll-to-roll inspection table with a tension of 100N / 1000mm, and irradiating it with a halogen lamp while visually inspecting it. Damage to the glass cloth roll sides was evaluated visually while the roll was still in the roll state. (Surface) A: No damage to the glass cloth roll surface B: Damage to the glass cloth roll surface, but it is resolved by unwinding three layers C: Damage to the glass cloth roll surface, which remains even after unwinding three layers (Side) A: No damage to the glass cloth roll sides B: Damage to the glass cloth roll sides due to contact with film or support plate

[0133] [Change in Dielectric Loss Tangent After 30 Days of Storage] Glass cloth rolls were stored for 30 days in an external environment with a temperature of 30°C and a dew point of 24°C dp. After 30 days, the glass cloth was removed from the packaging and the dielectric loss tangent was measured using the method described above. The change in dielectric loss tangent was calculated as the dielectric loss tangent at the start of storage (Df0) and the dielectric loss tangent after 30 days of storage (Df 30 The following formula was used to calculate the dielectric loss tangent change rate (%) = Df 30 / Df0 × 100

[0134] [Percentage Change in Dew Point of Internal Space After 30 Days of Storage] Glass cloth roll packaging was stored for 30 days in an external environment with a temperature of 30°C and a dew point of 24°C dp. After 30 days, the top plate of the packaging box was removed, and the dew point of the internal space of the sealed glass cloth roll was measured using a dew point meter placed inside the film. The dew point of the internal space can also be measured by inserting a measuring device into the film from the outside, or by bringing gas extracted from the inside into contact with the measuring device. The percentage change in dew point was measured according to the following formula. The average dew point of the external environment is the average value of the dew points measured over the 30-day storage period at the surface of the packaging box of the glass cloth roll packaging. Dew point change rate = (Internal space dew point after 30 days of storage (°Cdp) - Initial internal space dew point (°Cdp)) / (Average external environment dew point over 30 days (°Cdp) - Internal space dew point after 30 days of storage (°Cdp)) If the average external environment dew point over 30 days and the internal space dew point after 30 days of storage are equal, it is considered NG.

[0135] <Materials Used> <Film> Films A to C shown in Table 1 were used.

[0136]

[0137] <Core Tubes> Core Tube A: Paper, outer diameter 180 mm, inner diameter 76.2 mm, width and length 1350 mm Core Tube B: Fiber-reinforced plastic (FRP), outer diameter 240 mm, inner diameter 76.2 mm, width and length 1350 mm

[0138] <Glass Cloth and Glass Cloth Rolls> [Manufacturing of Q1078 (Raw Cloth)] Using glass yarn with an SiO2 composition content greater than 99.9% by mass, a cloth was woven in an air jet loom at a weaving density of 54 warp threads / 25 mm and 54 weft threads / 25 mm. The cloth width was woven to 1300 mm. As the warp threads, silica glass yarn with an average filament diameter of 5.0 μm, 200 filaments, and 1.0 Z twist was used. Similarly, as the weft threads, silica glass yarn with an average filament diameter of 5.0 μm, 200 filaments, and 1.0 Z twist was used. As a result, raw cloth of Q1078 was obtained.

[0139] [Manufacturing of Q1035 (bare cloth)] Using glass yarn with an SiO2 composition content greater than 99.9% by mass, a cloth was woven in an air jet loom at a weaving density of 66 warp threads / 25 mm and 68 weft threads / 25 mm. The cloth width was woven to 1300 mm. For the warp threads, silica glass yarn with an average filament diameter of 5.0 μm, 100 filaments, and 1.0 Z twist was used. Similarly, for the weft threads, silica glass yarn with an average filament diameter of 5.0 μm, 100 filaments, and 1.0 Z twist was used. As a result, the raw cloth of Q1035 was obtained.

[0140] [Manufacturing of Glass Cloth Rolls] Each of the raw glass cloths Q1078 and Q1035 was heated in a heating furnace at 600°C for 60 seconds to remove oil (heating and oil removal process). Subsequently, a treatment solution was prepared by dispersing 0.15% by mass of 3-methacryloxypropyltrimethoxysilane (surface treatment agent A, which is a silane coupling agent); Z6030 (manufactured by Dow-Toray) and 0.15% by mass of 5-hexenyltrimethoxysilane (surface treatment agent B, which is a silane coupling agent); Z6161 (manufactured by Dow-Toray) in pure water adjusted to pH = 3 with acetic acid. The cloth was immersed in the treatment solution at a line tension of 200 N and a line speed of 30 m / min (surface treatment agent coating process), squeezed with an NBR rubber roll at a pressure of 0.3 MPa, and then heated and dried at 130°C for 60 seconds to fix the silane coupling agent (fixing process). Apply a spray to the dried cloth at a rate of 2.0 kg / cm². 2 After high-pressure fiber opening at the specified pressure, the glass cloth was dried at 130°C for 1 minute (drying step) to obtain the glass cloth shown in Table 2. Q1035-1 was processed in the same manner as Q1035, except that the heat de-oiling step was performed at 1000°C instead of 600°C to obtain the glass cloth. Subsequently, the glass cloth was wound onto core tubes A or B in the combinations shown in Table 3 to obtain the glass cloth rolls shown in Table 3. The properties of the glass cloth are summarized in Table 2, and the properties of the glass cloth rolls are summarized in Table 3.

[0141]

[0142]

[0143] <Packaging Box> Side panels: Made of 10 or 5 mm thick corrugated cardboard, with internal dimensions of one of the following widths: 1360 mm, 1370 mm, 1390 mm, 1410 mm, 1450 mm, or 1550 mm, with a depth of 450 mm and a height of 460 mm. Bottom and top panels: Made of 10 or 5 mm thick corrugated cardboard, and if separated from the side panels, they are panels with a 50 mm high edge for fitting the side panels. The slits in the side panels are rectangles extending downward from the top end, with a width of 8 cm and a length of 33 cm when viewed from the front of the side panel. The U-shaped cutouts in the support panels are semicircular in shape when viewed from the front of the support panel, with the bottom being 5 mm larger than the diameter of the core tube, the width (excluding the semicircular part) being the same as the diameter of the semicircular part, and the length to the bottom being a U-shape extending downward from the top end so that the center of the semicircular part is the center of the height of the side panel. The circular cutout in the support plate is a circular shape located in the center of the plate, with a diameter 5 mm larger than the diameter of the core tube when viewed from the front. Note that if cushioning material is attached to the sides and support section, the shape after attachment will be as described above.

[0144] <Cushioning Material> Side cushioning material: Made of expanded polystyrene. When filling the axial end face 11S and the roll-facing surface with the side plate installed, the cushioning material was made with a width 8 mm smaller than the shortest distance between the axial end face 11S and the roll-facing surface 23S with the side plate installed, and was installed inside the packaging before closing the top plate. Support cushioning material: When attaching support cushioning material to the support plate, a 1 cm thick polyethylene cushioning sheet was installed along the cross section of the U-shaped cutout or circular cutout of the support plate, and was used in a size that resulted in the support size after installation being as described in the <Packaging Box> section above. Cross end cushioning material: When filling the space between the cross end face and the support plate as in Manufacturing Example 7, the cushioning material was made into a ring shape with a circle 5 mm larger than the diameter of the core tube cut out so that the center coincided with a circle of 350 mm, the same as the roll diameter, and was installed so that it aligned with the cross end face when the roll was lifted with the support rod.

[0145] <Desiccant> Desiccant A: Ablio® AW (Type A silica gel) manufactured by Toyota Chemical Corporation Desiccant B: RP agent (calcined diatomaceous earth and calcium oxide) manufactured by Mitsubishi Gas Chemical Company, Inc. (MGC)

[0146] <Basic Configuration of Packaging> The configurations A to G shown in Table 4 were used.

[0147]

[0148] <<Manufacturing of Glass Cloth Roll Packaging>> Using packaging boxes according to configurations A to G, glass cloth rolls, film, and packaging boxes were used in the combinations shown in Tables 5 to 9 to manufacture glass cloth roll packaging. In Tables 5 to 9, regarding side cushioning material, "Y" indicates that there is cushioning material between the roll-facing surface and the film, "N" indicates that the shortest distance between the axial end surface 11S and the roll-facing surface 23S with the side plate installed is greater than 1 cm and there is no cushioning material, and "-" indicates that the shortest distance between the axial end surface 11S and the roll-facing surface 23S with the side plate installed is 1 cm or less and there is no cushioning material. Regarding support cushioning material, "Y" indicates that there is film between the support and the glass cloth roll and cushioning material between the support and the film, "N" indicates that there is film between the support and the glass cloth roll and no cushioning material between the support and the film, and "-" indicates that there is no film between the support and the glass cloth roll. Regarding the cross-edge cushioning material, "Y" indicates that the cross-edge cushioning material is used, and "N" indicates that the cross-edge cushioning material is not used.

[0149] [Transportation and Storage of Glass Cloth Roll Packaging] The manufactured glass cloth roll packaging underwent vibration testing simulating transportation with the bottom plate in contact with the ground, and was then stored for 30 days in the external environment with the temperature and dew point described in Tables 5 to 9. The vibration testing was conducted under Level 2 conditions of random vibration testing, based on JIS Z0200:2023 and JIS Z0232. The excitation time was 50 minutes for profile A and 10 minutes for profile B, and the frequency range was 2 to 200 Hz.

[0150] <Example 1: Configuration A> Using glass cloth rolls with the manufacturing example numbers shown in Table 5, a packaging body was manufactured according to the following procedure. At this time, the initial temperature of the internal environment, initial dew point, internal pressure, workability, box sealing performance, and transport efficiency were evaluated. After that, the manufactured glass cloth roll packaging body was transported and stored, and after 30 days, the temperature of the internal environment, dew point, film defects, glass cloth defects, dielectric loss tangent of the glass cloth, Df change rate, and dew point change rate were evaluated. - A packaging box in which a side plate with a slit is integrated with the bottom plate is used. - A glass cloth roll and silica gel as a desiccant are placed inside a tubular film B so that the end in the axial direction of the roll becomes the film opening. - A support rod is inserted into the hollow part of the core tube from the film opening at one end in the axial direction of the roll to create a cantilevered state. - The glass cloth roll is transported in a cantilevered state, and the support rod is inserted from above into the slit of the side plate, and the glass cloth roll is placed on the support cushioning material on the bottom plate. - The support rod is removed from the core tube. - The opening of the film is heat-sealed using a heat sealer in an environment controlled to a temperature of 23°C and a dew point of 12°C dp. - Side cushioning material is installed between the axial end face and the roll-facing face. - The top plate is placed over the side plate.

[0151] <Example 2: Configuration B> A packaging body was manufactured using the configuration shown in Table 5, following the procedure below, and the glass cloth roll packaging body was evaluated in the same manner as in Example 1. - A packaging box with side plates that can move relative to the bottom plate is used. - A bag-shaped film A is spread on the bottom plate and pressed down. - A support rod is inserted into the hollow part of the core tube from one end of the glass cloth roll in the roll axis direction to create a cantilevered state. - The glass cloth roll is transported in the cantilevered state and placed inside the bag. - The support rod is removed from the core tube. - The opening of the film is pulled up to the top of the glass cloth roll. - The side plates are installed. - Silica gel is sealed inside the film as a desiccant in an environment controlled to a temperature of 23°C and a dew point of 12°C dp, and the opening of the film is heat-sealed using a heat sealer. - The top plate is placed over the side plates.

[0152] <Example 3: Configuration C> A packaging body was manufactured using the configuration shown in Table 5, following the procedure below, and the glass cloth roll packaging body was evaluated in the same manner as in Example 1. - A packaging box in which a side plate with a slit is integrated with the bottom plate is used. - A support plate is placed on the bottom plate. - A glass cloth roll and silica gel as a desiccant are placed inside a tubular film B so that the end of the roll axial direction becomes the film opening. - A support rod is inserted into the hollow part of the core tube from the film opening at one end of the roll axial direction to create a cantilevered state. - The glass cloth roll is transported in a cantilevered state, and the support rod is inserted from above into the slit of the side plate, and the glass cloth roll is placed on the notch of the support plate. - The support rod is removed from the core tube. - The opening of the film is heat-sealed using a heat sealer in an environment controlled to a temperature of 23°C and a dew point of 12°C dp. - Side cushioning material is placed between the axial end face and the roll-facing surface. - The top plate is placed over the side plate.

[0153] <Example 4: Configuration C> The packaging was manufactured using the same procedure as in Example 3, except that when the support plate was placed on the base plate, cushioning material was further placed on the notch of the support plate.

[0154] <Example 5: Configuration C> A package was manufactured using the same procedure as in Example 4, except that a larger box was used in both box width and internal dimensions, and the evaluation was carried out.

[0155] <Example 6: Configuration D> A packaging body was manufactured using the configuration shown in Table 6, following the procedure below, and the glass cloth roll packaging body was evaluated in the same manner as in Example 1. - A packaging box in which a side plate with a slit is integrated with a bottom plate is used. - A bag-shaped film A is spread on the bottom plate. - A support plate is placed on the film. At this time, the film is pressed down so that the notches of the side plate and the support plate are exposed. - A support rod is inserted into the hollow part of the core tube from one end of the glass cloth roll in the roll axis direction to create a cantilevered state. - The glass cloth roll is transported in a cantilevered state, and the support rod is inserted from above into the slit of the side plate, and the glass cloth roll is placed on the notch of the support plate. - The support rod is removed from the core tube. - The opening of the film is pulled up to the top of the glass cloth roll. - In an environment controlled to a temperature of 23°C and a dew point of 12°C dp, silica gel is sealed inside the film as a desiccant, and the opening of the film is heat-sealed using a heat sealer. - Install side cushioning material between the axial end face and the roll-facing surface. - Place the top plate over the side plate.

[0156] <Example 7: Configuration D> A packaging body was manufactured using the same procedure as in Example 6, except that a ring-shaped cross end cushioning material was installed along the cross end face when the body was in a cantilevered state, and no side cushioning material was installed between the axial end face and the roll-facing surface. The packaging body was then evaluated.

[0157] <Example 8: Configuration E> A packaging body was manufactured using the configuration shown in Table 7, following the procedure below, and the glass cloth roll packaging body was evaluated in the same manner as in Example 1. - A packaging box with side plates that can move relative to the bottom plate is used. - A bag-shaped film A is spread on the bottom plate. - A support rod is inserted into the hollow part of the core tube from one end of the glass cloth roll in the axial direction to create a cantilevered state. - The glass cloth roll is transported in the cantilevered state. The glass cloth roll is placed on the film with the cutouts of the support plate, which has circular cutouts, inserted into each of the axial ends of the glass cloth roll. In this way, the glass cloth roll is supported by the support plate on the bottom plate. - The support rod is removed from the core tube. - The opening of the film is pulled up to the top of the glass cloth roll. - The side plates are installed. - Silica gel is sealed inside the film as a desiccant in an environment controlled to a temperature of 23°C and a dew point of 12°C dp, and the opening of the film is heat-sealed using a heat sealer. - The top plate is placed over the side plates.

[0158] <Example 9: Configuration F> A packaging body was manufactured using the configuration shown in Table 6, following the procedure below, and the glass cloth roll packaging body was evaluated in the same manner as in Example 1. - A packaging box with side plates that can move relative to the bottom plate is used. - A bag-shaped film A is spread on the bottom plate. - A support is placed on the film. At this time, the film is pushed down so that the notch of the support plate is exposed. - A support rod is inserted into the hollow part of the core tube from one end of the glass cloth roll in the roll axis direction to create a cantilevered state. - The glass cloth roll is transported in the cantilevered state and placed on the notch of the support plate. - The support rod is removed from the core tube. - The opening of the film is pulled up to the top of the glass cloth roll. - The side plates are installed. - In an environment controlled to a temperature of 23°C and a dew point of 12°C dp, silica gel is sealed inside the film as a desiccant, and the opening of the film is heat-sealed using a heat sealer. - The top plate is placed over the side plates.

[0159] <Example 10: Configuration G> A packaging body was manufactured using the configuration shown in Table 8, following the procedure below, and the glass cloth roll packaging body was evaluated in the same manner as in Example 1. - A packaging box with side plates that can move relative to the bottom plate is used. - A support plate is installed on the bottom plate. - A glass cloth roll and silica gel as a desiccant are placed inside a tubular film B so that the end in the axial direction of the roll becomes the film opening. - A support rod is inserted into the hollow part of the core tube from the film opening at one end in the axial direction of the roll to create a cantilevered state. - The glass cloth roll is transported in the cantilevered state and placed on the notch of the support plate. - The support rod is removed from the core tube. - The opening of the film is heat-sealed using a heat sealer in an environment controlled to a temperature of 23°C and a dew point of 12°C dp. - Side plates are installed. - The top plate is placed over the side plates.

[0160] <Example 11: Configuration G> The packaging was manufactured using the same procedure as in Example 10, except that when the support plate was installed on the bottom plate, cushioning material was further installed on the notch of the support plate, and magnesium chloride was used instead of silica gel as a desiccant, and the packaging was evaluated.

[0161] <Example 12: Configuration G> A package was manufactured using the same procedure as in Example 11, except that a 0.5 cm thick corrugated cardboard box was used and the box size was changed, and film C was used. The package was then evaluated.

[0162] <Comparative Example 1: Comparison of Configuration A> A package was manufactured using the same procedure as in Example 1, except that film was not used and the box size was changed, and the evaluation was carried out. In addition, side cushioning material was not used due to the change in box size.

[0163] <Comparative Example 2: Configuration A> A package was manufactured using the same procedure as in Example 1, except that the box size was changed, and the evaluation was carried out. Note that, due to the change in box size, side cushioning material was not used.

[0164] <Comparative Example 3: Configuration C> The packaging was manufactured using the same procedure as in Example 3, except that the box size was changed, and the evaluation was carried out. Note that, due to the change in box size, side cushioning material was not used.

[0165] <Comparative Example 4: Configuration D> The packaging was manufactured using the same procedure as in Example 6, except that the box size was changed, and the evaluation was carried out. Note that, due to the change in box size, side cushioning material was not used.

[0166] <Examples 5-1, 8-1, 9-1> Except for changing the arrangement of the cushioning material as shown in Tables 6 and 7, the packaging was prepared using the same procedure as in Example 5 (for Example 5-1), Example 8 (for Example 8-1), and Example 9 (for Example 9-1), and was evaluated accordingly.

[0167] The evaluation results for each example and comparative example are summarized in Tables 5 to 9.

[0168]

[0169]

[0170]

[0171]

[0172]

[0173] The glass cloth roll packaging of the present invention can be suitably applied to the transportation and storage of glass cloth rolls.

[0174] 1 Glass cloth roll packaging 10 Glass cloth roll sealing 11 Glass cloth roll 11S Axial end face 12 Film 111 Core tube 111a Hollow section 111e Exposed area 112 Glass cloth 20 Packaging box 21 Bottom plate 22 Top plate 23 Side plates 23a, 31a, 33a Notches 23S Roll opposing surfaces 31, 33 Support plate 32 Fixing part 41 Support part cushioning material 42 Side cushioning material 43 Cloth end face cushioning material

Claims

1. A glass cloth roll packaging comprising a glass cloth roll seal and a packaging box for housing the glass cloth roll seal, wherein the glass cloth roll seal includes a glass cloth roll and a film having an internal space that seals at least the glass cloth roll, the glass cloth roll includes a hollow columnar core tube and glass cloth wound around the core tube, the glass cloth is composed of glass threads containing a plurality of filaments as warp and weft threads, the packaging box has a bottom plate, a top plate and side plates, the side plates have roll-facing surfaces facing the axial end faces of the glass cloth roll, and the roll-facing surfaces satisfy at least one of the following (1) and (2): (1) at least one of the roll-facing surfaces is movable relative to the bottom plate, and (2) at least one of the roll-facing surfaces is separated from the axial end faces of the glass cloth roll by a minimum gap distance GD, the minimum gap distance GD being greater than 5 mm.

2. A glass cloth roll packaging comprising a glass cloth roll seal and a packaging box for housing the glass cloth roll seal, wherein the glass cloth roll seal includes a glass cloth roll and a film having an internal space that seals at least the glass cloth roll, the glass cloth roll includes a hollow columnar core tube and glass cloth wound around the core tube, the glass cloth is composed of glass threads containing a plurality of filaments as warp and weft threads, the packaging box has a bottom plate, a top plate and side plates, the side plates have roll-facing surfaces facing the axial end face of the glass cloth roll, and the roll-facing surfaces satisfy at least one of the following (1) and (2): (1) at least one of the roll-facing surfaces is movable relative to the bottom plate, (2) at least one of the roll-facing surfaces is separated from the axial end face of the glass cloth roll by the shortest possible gap distance GD, The glass cloth roll packaging is such that the shortest gap distance GD is such that the shortest gap distance GD and the film thickness T satisfy the formula: GD ≥ T × 60.

3. The glass cloth roll packaging according to claim 2, wherein the shortest gap distance GD and the film thickness T satisfy the formula: GD ≤ T × 1500.

4. The glass cloth roll packaging according to claim 1 or 2, wherein the dew point of the internal space is 18°C ​​dp or less.

5. The glass cloth roll packaging according to claim 1 or 2, wherein the difference between the inner dimensions of the packaging box in the axial direction of the glass cloth roll and the total length of the glass cloth roll in the axial direction is 15 cm or less.

6. The glass cloth roll packaging according to claim 1 or 2, wherein the value obtained by dividing the difference between the inner dimensions of the packaging box in the direction corresponding to the axial direction of the glass cloth roll and the total axial length of the glass cloth roll by the thickness T of the film is 110 or more.

7. The glass cloth roll packaging according to claim 1 or 2, wherein at least one of the roll-facing surfaces is separated from the axial end face of the glass cloth roll by a minimum gap distance GD, and the side plate having at least one of the roll-facing surfaces has a notch with a width of 50% or more of the inner diameter of the core tube and less than the outer diameter of the core tube.

8. The glass cloth roll packaging body according to claim 1 or 2, wherein the core tube has a pair of exposed regions at both axial ends on which the glass cloth is not wound, and the packaging box further has a support for supporting the glass cloth roll in the exposed regions.

9. The glass cloth roll packaging according to claim 8, wherein the support body has at least one pair of support plates having notches extending downward from their upper ends, the pair of support plates are fixed vertically and spaced apart from each other, and the glass cloth roll is supported by the support body by each of the pair of exposed areas being placed on each of the notches.

10. The glass cloth roll packaging according to claim 8, wherein the support body has a pair of support plates having cutouts, and the glass cloth roll is supported by the support body by the support body when the support plates are placed vertically with each of the pair of exposed regions being inserted axially into each of the cutouts.

11. The glass cloth roll packaging according to claim 8, wherein the support is located inside the glass cloth roll sealing body.

12. The glass cloth roll packaging according to claim 11, wherein the shortest gap distance GD is 1 cm or more.

13. The glass cloth roll packaging according to claim 12, wherein the shortest distance between each of the roll-facing surfaces and the support is 1 cm to 15 cm.

14. The glass cloth roll packaging according to claim 8, wherein the support is located on the outside of the glass cloth roll sealing body.

15. The glass cloth roll packaging according to claim 14, wherein the shortest gap distance GD is 1 cm or more.

16. The glass cloth roll packaging according to claim 8, further comprising a cushioning material disposed between the support and the exposed area.

17. The glass cloth roll packaging according to claim 1 or 2, further comprising a cushioning material disposed between the roll-facing surface and the axial end surface of the glass cloth roll.

18. The glass cloth roll packaging according to claim 1 or 2, wherein the core tube has a pair of exposed regions at both axial ends where the glass cloth is not wound, and further comprises a cushioning material disposed on the exposed regions along the roll axial end faces of the glass cloth within the glass cloth roll sealing body.

19. The glass cloth roll packaging according to claim 1 or 2, further comprising a desiccant disposed in the internal space.

20. The amount of the desiccant enclosed is given by the following formula: WVTR [g / (m 2 ×24hr) × Film surface area [m²] 2 The glass cloth roll packaging according to claim 19, satisfying the following conditions: ] / amount of desiccant enclosed [g] ≤ 0.0030 (wherein WVTR is the water vapor transmission rate of the film measured at a temperature of 40°C and a relative humidity of 90%).

21. The glass cloth roll packaging according to claim 1 or 2, wherein the thickness of the bottom plate, the side plate, and the top plate is 0.3 cm or more, each.

22. The water vapor permeability of the film is 8 g / (m²). 2 The glass cloth roll packaging body according to claim 1 or 2, wherein the length is less than or equal to 24 hours.

23. The glass cloth roll packaging according to claim 1 or 2, wherein the thickness of the film is 50 μm or more.

24. The glass cloth roll packaging according to claim 1 or 2, wherein the weight of the glass cloth roll is 5 kg or more.

25. The glass cloth roll packaging according to claim 1 or 2, wherein the difference between the outer diameter of the glass cloth wound around the core tube and the outer diameter of the core tube is 1 cm or more.

26. The glass cloth roll packaging according to claim 1 or 2, wherein the dielectric loss tangent of the glass cloth at 10 GHz is 0.00200 or less.

27. The glass cloth roll packaging according to claim 1 or 2, wherein the silicon (Si) content in the glass yarn is 95.0% to 100% by mass in terms of silicon dioxide (SiO2).

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