Manufacturing method of glass cloth core tube and glass cloth wound body

Abstract

To provide a core tube for glass cloth that can suppress the occurrence of winding wrinkles even when glass cloth with a relatively low elastic modulus is wound while being pressed with a pressing roll, and a manufacturing method of a glass cloth core tube using the core tube.SOLUTION: The core tube for glass cloth for winding glass cloth includes: a base material having a cylindrical shape; and one or more first band convex portions arranged along a circumferential direction on a side surface of the base material. The first band convex portion has a longitudinal length of 75% or more of a circumferential length of the base material.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a core tube for glass cloth and a method for manufacturing a glass cloth wound body using the same. do. [Background technology]

[0002] Printed wiring boards used in electronic devices are usually made by impregnating a base material such as glass cloth with resin. In recent years, the performance of information terminals such as smartphones has improved, With the advancement of high-speed communication, the dielectric constant and dielectric loss tangent of printed wiring boards have been reduced significantly.

[0003] Accordingly, glass cloth that makes up printed wiring boards is also being used that has a low dielectric constant. Such low dielectric glass cloth has been generally used up until now. Compared to E-glass cloth, the glass contains more B2O3, resulting in a low dielectric constant and low dielectric loss tangent. can be expressed.

[0004] However, the elastic modulus of such low dielectric glass cloth is lower than that of conventional E-glass cloth. For example, a glass cloth with a low modulus of elasticity is wound around the Occasionally, wrinkles tend to form on the glass sheet after it has been unwound from the roll. The distortion of the woven structure is easily accumulated in the loss. In this case, variations in dimensions occur during the manufacturing process of the printed wiring board and the circuit pattern formation process. This causes the problem of the key becoming larger.

[0005] In addition, when a thin, large, long material such as glass cloth is wound into a large diameter roll, If the winding accuracy is poor, the core tube may become misaligned. To improve the adhesion, the adhesive tape is placed so that its length is parallel to the longitudinal center axis of the core tube. A method of attaching it to the outer peripheral surface of a core tube is known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-35830 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the above method is suitable for copper foils that have a certain degree of physical strength. This method also prevents the occurrence of wrinkles in the low dielectric glass cloth, which has a low elastic modulus. cannot be done.

[0008] The present invention has been made in consideration of the above problems, and provides a method for manufacturing a glass cloth having a relatively low elastic modulus, Even when winding while pressing with a pressure roll, the occurrence of winding wrinkles can be suppressed. The present invention aims to provide a core tube for lath cloth and a method for manufacturing a glass cloth wound body using the same. The target. [Means for solving the problem]

[0009] The present inventors have conducted extensive research to solve the above problems. It has been found that the above problems can be solved by using a glass cloth core tube having the above properties. This led to the completion of the project.

[0010] That is, the present invention is as follows. [1] A glass cloth core tube for winding a glass cloth, A substrate having a cylindrical shape; one or more first band-shaped protrusions arranged along a circumferential direction on a side surface of the base material, The longitudinal length of the first band-shaped convex portion is 75% or more of the circumferential length of the base material. Core tube for glass cloth. [2] The substrate further has one or more second band-shaped protrusions arranged along the axial direction on the side surface thereof. , The core tube for glass cloth according to [1]. [3] A glass cloth core tube for winding a glass cloth, A substrate having a cylindrical shape; one or more second band-shaped protrusions arranged along the axial direction on the side surface of the base material, the second band-shaped convex portion includes a pressure-sensitive adhesive layer having a thickness of 2 μm or more and less than 10 μm; Core tube for glass cloth. [4] The substrate further has one or more first band-shaped protrusions arranged along the circumferential direction on the side surface thereof. Ru, The core tube for glass cloth according to [3]. [5] The first belt-shaped convex portion and / or the second belt-shaped convex portion are formed by double-sided tape. The core tube for glass cloth according to any one of [1] to [4]. [6] The elastic modulus of the glass cloth is 50 GPa to 70 GPa. The core tube for glass cloth according to any one of [1] to [5]. [7] [1] to [6]. A glass cloth winding method using the glass cloth core tube according to any one of [1] to [6]. A method for producing a body, comprising: The glass cloth is pressed toward the center of the glass cloth core tube by a pressure roll. and winding the film. Manufacturing method. [Effects of the Invention]

[0011] According to the present invention, a glass cloth having a relatively low modulus of elasticity is wound while being pressed by a pressure roll. A core tube for glass cloth that can suppress the occurrence of winding wrinkles even when the glass cloth is wound, and a core tube using the same The present invention provides a method for manufacturing a glass cloth wound body. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a view showing one aspect of a core tube for glass cloth according to an embodiment of the present invention. [Figure 2] FIG. 10 is a cross-sectional view of a wound body when a conventional core tube is used. [Figure 3] 1 is a view showing one aspect of a core tube for glass cloth according to an embodiment of the present invention. [Figure 4] 1 is a view showing one aspect of a core tube for glass cloth according to an embodiment of the present invention. [Figure 5] 1A to 1C are diagrams illustrating an example of a method for manufacturing a glass cloth wound body according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention (hereinafter referred to as "the present embodiment") will be described with reference to the drawings as necessary. However, the present invention is not limited to this, and the gist of the present invention is not limited to this. Various modifications are possible within the scope of the present invention. In addition, the positional relationship such as up, down, left, and right will not be specified. Insofar as possible, the positional relationship shown in the drawings shall be based on the above. It is not limited to:

[0014] [Core tube for glass cloth (first embodiment)] The core tube for glass cloth of this embodiment is a core tube for glass cloth for winding up glass cloth. The tube has a cylindrical base and a pair of bifurcated tubes arranged on the side of the base along the circumferential direction. and a plurality of first band-shaped protrusions, the longitudinal length of the first band-shaped protrusions being equal to or greater than the circumferential length of the base material. This is more than 75% of the total.

[0015] FIG. 1 shows one aspect of the core tube for glass cloth according to the present embodiment. As shown in FIG. The glass cloth core tube 10 has one or more circumferentially arranged portions on the side surface of the substrate 1. The first belt-shaped protrusions 2 have a plurality of first belt-shaped protrusions 2. The longitudinal length of the first belt-shaped protrusions 2 is equal to the circumferential length of the substrate 1. The length of the first band-shaped protrusion 2 in the longitudinal direction is 75% or more of the circumferential length of the base material 1. When the ratio is less than 0%, the portion of the side surface of the base material 1 where the first band-shaped convex portion 2 does not exist is When observed from the axial direction, the recess 3 in the outermost peripheral shape of the glass cloth core tube 10 is This is confirmed.

[0016] As in the past, the adhesive tape was attached to the core so that its length was parallel to the longitudinal center axis of the core tube. When the core tube is attached to the outer periphery of the tube, the core tube has the outermost periphery shape when observed from the axial direction of the substrate 1. When winding is performed using such a core tube, the glass cloth wound body has the following: The cross section of the glass fiber grows as shown in Figure 2, and the glass fiber is densely wound around the circumferential direction of the substrate. It was found that sparsely wound portions were generated.

[0017] In the sparsely wound part, the glass cloth wound on the core tube side of the winding body is on the outside of the winding body. It is not restrained by the wound glass cloth. Therefore, when it is wound with a certain tension, In this case, the glass cloth is likely to shrink in the width direction (longitudinal direction of the core tube). The stress distribution caused by the tension makes it easy for the winding to become tight inside the wound body. In the loosely wound part, the core tube and the The coefficient of friction between the glass cloth and the layers of the glass cloth is reduced, so the above-mentioned width direction When shrinkage and longitudinal tightening occur, the glass cloth shifts and stress is released. This causes wrinkles to form when rolled up.

[0018] Furthermore, with a cross-sectional shape like that shown in Figure 2, the glass cloth winding grows and distortion increases. When this happens, the vertical vibrations of each part of the winding machine become intense in accordance with the distorted winding shape, and winding accuracy is affected. The degree of control becomes more difficult.

[0019] In contrast to this, in this embodiment, the length in the longitudinal direction is 75% or more of the circumferential length of the substrate. The first belt-shaped protrusions 2 are configured so that the glass cloth having a relatively low elastic modulus can be Even when winding while pressing with a pressure roll, it is possible to suppress the occurrence of winding wrinkles. do.

[0020] The reason for this is not particularly limited, but it is possible that the pressing pressure from the pressing roll is applied to the circumference of the wound body. Since it acts uniformly throughout the entire circumference, it is possible to wind the wire evenly and densely throughout the circumference. It is believed that this problem can be avoided. When the tape is attached to the outer surface of the core tube so that the thickness direction is parallel to the central axis of the core tube, the adhesive Only the tape portion becomes convex by the thickness of the adhesive tape. In this case, the pressure roll The convex part of the adhesive tape pushes up, weakening the pressure around that part. When the tape passes the shaped part, the pressure roll returns and the pressure is applied strongly. As this process is repeated, the areas with weaker pressure become sparser and the areas with stronger pressure become denser. In this embodiment, the first band-shaped convex portion on the circumference It is believed that the above problems can be avoided by reducing the apparent amount of adhesive tape. can be obtained.

[0021] [Base material] In the core tube for glass cloth of this embodiment, the substrate 1 has a cylindrical shape. The material is not particularly limited, but may be, for example, paper, plastic such as ABS resin, FRP (fiber resistant plastic), etc. Examples include metals such as reinforced plastic and stainless steel.

[0022] The length of the substrate 1 in the width direction (longitudinal direction of the core tube) is longer than the width of the glass cloth to be wound. Specifically, the length is preferably 1 / 2 the width of the glass cloth to be wound. It is preferably 0.01 to 1.1 times, more preferably 1.03 to 1.1 times, and even more preferably The length is 1.05 to 1.1 times. By keeping the length within the above range, the winding accuracy can be controlled more precisely. This is likely to become even easier.

[0023] The diameter of the substrate 1 is preferably 100 to 500 mm, more preferably 130 150 to 350 mm, more preferably 150 to 300 mm, and even more preferably 15 The larger the diameter of the substrate 1, the more the glass cloth of the same length is wound. The number of windings at the time of winding is reduced, and the thickness of the wound glass cloth is reduced. The larger the diameter of the material 1, the greater the stress acting on the glass cloth wound on the core tube side of the wound body. The difference in stress acting on the glass cloth wound on the outside of the wound body becomes smaller, and winding wrinkles are reduced. On the other hand, the smaller the diameter of the substrate 1, the smaller the volume and weight of the wound body. This is advantageous for storage and distribution. In addition, the diameter of the substrate 1 is small and the curvature is large. The larger the thickness, the larger the cross section of the wound body will grow as shown in Figure 2 due to the convex adhesive tape. Therefore, the present invention makes it possible to obtain a stable wound body without wrinkles. This is preferable because

[0024] [First belt-shaped convex part] The first band-shaped protrusions 2 are arranged along the circumferential direction on the side surface of the substrate 1. The first band-shaped protrusions 2 are It is preferable that they are arranged parallel to the circumferential direction of the substrate 1 .

[0025] A plurality of first band-shaped protrusions 2 may be provided on the side surface of the substrate 1. In this case, each The recesses formed by the first band-shaped protrusions 2 are aligned on a straight line parallel to the longitudinal center axis of the core tube. Among these, a plurality of first band-shaped protrusions 2 may be arranged in a line. In this case, the recesses formed by the first band-shaped protrusions 2 are aligned along the longitudinal center of the core tube. It is preferable that they are arranged in a straight line parallel to the axis. tends to be suppressed.

[0026] The first band-shaped protrusions 2 are arranged symmetrically when viewed from the side of the substrate 1. For example, when only one first belt-shaped protrusion 2 is provided, the first belt-shaped protrusion 2 is preferably arranged at the center of the substrate 1. In addition, when an even number of first belt-shaped protrusions 2 are arranged, In this case, the first belt-shaped protrusions 2 are arranged symmetrically when viewed from the side of the substrate 1. This arrangement makes it possible to suppress the occurrence of tension differences between the left and right sides during winding. This tends to further suppress wrinkles during winding.

[0027] The length of the first band-shaped protrusion 2 in the longitudinal direction is 75% or more and 100% or less of the circumferential length of the base material. It is preferably 85% or more and 100% or less, and more preferably 95% or more and 100% or less. % or less. When the length of the first belt-shaped protrusion 2 in the longitudinal direction is within the above range, the winding The trend is toward greater ease of precision control.

[0028] The width W1 of the first band-shaped convex portion 2 is preferably 5 to 100 mm, more preferably 10 to 100 mm. The width W1 is preferably 5 mm or more, and more preferably 20 to 40 mm. This allows the glass cloth to be more firmly fixed to the core tube, reducing tension during winding. This makes it possible to prevent the glass cloth from being loosely wound. The occurrence of wrinkles tends to be suppressed more easily. This makes it difficult for wrinkles to form when attaching the glass cloth to the core tube. This tends to further suppress the occurrence of winding wrinkles caused by initial wrinkles that occur during application.

[0029] The thickness H of the first band-shaped convex portion 2 is preferably 5 to 300 μm, more preferably 10 to 200 μm, more preferably 20 to 100 μm, and even more preferably 2 When the thickness H of the first belt-shaped protrusion 2 is 5 μm or more, the thickness H of the first belt-shaped protrusion 2 is 0 μm to 40 μm. The pressure applied by the press acts uniformly all around the winding, resulting in uniform and dense winding all around. When the thickness H of the first band-shaped protrusion 2 is 300 μm or less, the pressing force The difference in the width direction of the press pressure by the roll can be kept within a small range, The occurrence of wrinkles due to variations in the first band-shaped protrusion 2 tends to be suppressed. By setting the thickness H within the above range, wrinkles do not occur when attaching the glass cloth to the core tube. Therefore, the occurrence of wrinkles due to the initial wrinkles that occur when applying the film is less likely to occur. tends to be suppressed.

[0030] The material of the first belt-shaped convex portion 2 is not particularly limited, but may be, for example, an adhesive tape such as a double-sided tape. Examples of suitable materials include rubber and resin. Among these, double-sided tape is preferred. 1 The use of a belt-shaped convex portion tends to improve the ease of handling. Before use, the double-sided tape is protected by a release paper to prevent the adhesive layer from being exposed. good.

[0031] In addition, the material of the first belt-shaped convex portion 2 may be an adhesive material such as double-sided tape or an anti-slip material such as rubber. By using this material, it is possible to prevent misalignment at the interface between the core tube and the glass cloth. The glass cloth is subjected to a stress that causes it to shrink in the width direction due to the winding tension. However, by using adhesive materials or anti-slip materials, such shrinkage in the width direction can be avoided. Also, as shown in Figure 2, in the sparsely wound part due to distortion, The glass cloth wound on the core tube side of the winding body is held in place by the glass cloth wound on the outside of the winding body. Since the glass cloth is not constrained, it shrinks in the width direction at the boundary between the core tube and the glass cloth. However, if the first belt-shaped protrusion 2 is made of an adhesive material or By using the anti-slip member, such shrinkage in the width direction can also be avoided.

[0032] When a plurality of first belt-shaped protrusions 2 are arranged, at least two first belt-shaped protrusions 2 are arranged at the ends of the substrate 1. More specifically, it is preferable that the first band-shaped protrusion 2 is disposed at a position close to the end of the base material 1. When the substrate is placed at a distance L1 from the longitudinal direction of the substrate, the distance L1 is , preferably 0 to 15%, more preferably 0 to 11%, and further preferably 0 In this way, by arranging the first band-shaped protrusions 2 at positions close to the ends of the substrate 1, This tends to further suppress the occurrence of wrinkles when winding. When using a method in which pressure is applied toward the center of the core tube while winding, wrinkles are likely to occur. It can be significantly suppressed.

[0033] [Second band-shaped convex part] As shown in FIG. 3, the core tube for glass cloth of this embodiment has a base material 1 and a slit 15 extending along the axial direction. The second band-shaped protrusion 4 may further include one or more second band-shaped protrusions 4 arranged in a manner similar to that of the first band-shaped protrusion 4. By having such a structure, the radial stress caused by the winding tension acts uniformly in the width direction. This tends to further improve the uniformity of the wound roll.

[0034] A plurality of second band-shaped protrusions 4 may be provided on the side surface of the substrate 1. Position of the second band-shaped protrusions 4 is not particularly limited, but for example, as shown in FIG. 2, or a cross-shaped arrangement in which the first band-shaped protrusion 2 intersects with the middle of the first band-shaped protrusion 2 as shown in FIG.

[0035] The length of the second belt-shaped protrusion 4 in the longitudinal direction is equal to or greater than the width of the glass cloth to be wound. It is preferable that the length of the second belt-shaped protrusion 4 is equal to or less than the length L of the material. The width is preferably 0.95 to 1.1 times the width of the glass cloth to be wound, and more preferably Preferably, it is 0.98 to 1.05 times, and more preferably, it is 0.99 to 1.02 times. The length of the two belt-like protrusions 4 in the longitudinal direction may be the same as the width of the glass cloth to be wound up. When the longitudinal length of the belt-shaped protrusion 4 is within the above range, the winding accuracy can be more easily controlled. It tends to become easier.

[0036] The width of the second band-shaped convex portion 4 is preferably 5 to 100 mm, more preferably 10 to 50 mm, and more preferably 20 to 40 mm. The glass cloth can be more firmly fixed to the core tube, improving the tension during winding. This makes it possible to prevent the glass cloth from being loosely wound, and The occurrence of wrinkles tends to be suppressed. In addition, by keeping the width below 100 mm, This prevents wrinkles from forming when attaching the glass cloth to the core tube. The occurrence of rolling wrinkles due to the initial wrinkles tends to be further suppressed.

[0037] The thickness of the second band-shaped convex portion 4 is preferably 0.5 to 150 μm, more preferably 1 to The thickness of the second band-shaped convex portion 4 is 0.5 to 50 μm, and more preferably 1 to 40 μm. μm or more, the glass cloth tends to be more firmly fixed to the core tube. In addition, since the thickness of the second band-shaped convex portion 4 is 150 μm or less, the Distortion is suppressed, and the transfer of the step marks of the second belt-shaped convex portion to the glass cloth is suppressed. Therefore, wrinkles are less likely to occur when attaching the glass cloth to the core tube. This tends to further reduce the occurrence of wrinkles caused by the initial wrinkles that occur when applying the film. be.

[0038] The material of the second belt-shaped convex portion is not particularly limited, but may be, for example, an adhesive tape such as a double-sided tape, Examples of the material include rubber and resin. Among these, double-sided tape is preferable. The use of the belt-shaped convex portion tends to improve the ease of handling. In the previous state, the double-sided tape may be protected by a release paper to prevent the adhesive layer from being exposed. stomach.

[0039] In addition, the second belt-shaped convex portion 4 may be made of an adhesive material such as double-sided tape or a non-slip material such as rubber. In this case, the glass cloth passes through the width direction and is fixed to the core tube. This allows the glass cloth to be pulled evenly across the width, allowing it to be wound up evenly. This tends to be the case.

[0040] [Recess] When the length of the first band-shaped protrusion 2 in the longitudinal direction is less than 100% of the circumferential length of the substrate 1, When the side surface of the substrate 1 is observed from the axial direction of the substrate 1, the portion where the first band-shaped protrusion 2 does not exist is This is confirmed as a recess 3 in the outermost peripheral shape of the glass cloth core tube 10. At least a part of the inner wall may be formed by the end of the first band-shaped protrusion, as shown in FIG. As shown in FIG. 2, at least a part of the inner wall of the recess is formed on the side of the second band-shaped protrusion. It may be formed at the end.

[0041] The ratio of the width R of the recess to the circumferential length of the approximation of the outermost periphery is preferably 25% or less. The lower limit of the ratio of the width R of the recess is preferably 15% or less, and more preferably 5% or less. may be 0%, and from the viewpoint of facilitating the formation of the first band-shaped convex portion on the core tube, it is preferable that It is 5% or more, more preferably 1% or more, and even more preferably 0.2% or more.

[0042] The width R of the recess is determined by observing the glass cloth core tube from the axial direction of the substrate, and and the length of the portion 3b where the second belt-shaped convex portion 4 is not in contact with the surface of the base material. In addition, the "circumferential length of the outermost periphery approximated as a circle" is the circumferential length of the outermost periphery of the substrate 1 approximated as a circle. The value obtained by subtracting the length of the first belt-shaped convex portion from the circumference of the substrate 1 can also be considered as the width R of the concave portion. Cut.

[0043] [Core tube for glass cloth (second embodiment)] The core tube for glass cloth of the second embodiment is a glass cloth core tube for winding glass cloth. A core tube includes a base material having a cylindrical shape and a core tube having a cylindrical shape and a core tube disposed on a side surface of the base material along an axial direction. or a plurality of second band-shaped convex portions, wherein the second band-shaped convex portions have a thickness of 2 μm or more and less than 30 μm. It is composed of an adhesive layer.

[0044] In the second embodiment of the glass cloth core tube, a second thin layer is formed only from an adhesive layer. This allows the glass cloth to be densely wound around the circumferential direction of the substrate, as shown in Figure 2. It was found that there were few areas where the wire was wound tightly and areas where it was loosely wound.

[0045] In the second embodiment, the thickness of the adhesive layer of the second belt-shaped convex portion is 2 μm or more and less than 30 μm. Preferably, it is 3 μm or more and less than 22 μm, and more preferably, it is 4 μm or more and less than 15 μm. It is more preferably 5 μm or more and less than 10 μm.

[0046] If the thickness is less than 30 μm, when the glass cloth is attached to the core tube, The adhesive layer penetrates into the recesses in the uneven surface and the gaps between the warp and weft threads of the glass cloth. By doing so, it is possible to reduce the thickness of the second belt-shaped convex portion to less than half of the thickness of the glass cloth. Therefore, even when a glass cloth with a relatively low modulus of elasticity is wound while being pressed with a pressure roll, The occurrence of winding wrinkles can be suppressed.

[0047] If the thickness is 2 μm or more, the adhesive may adhere to the concave and convex parts of the surface of the glass cloth or to the glass. The adhesive layer penetrates into the gaps between the warp and weft threads of the cloth, increasing the adhesive area. This strengthens the adhesive strength between the core tube and the glass cloth, allowing for proper winding tension to be applied. It can be done.

[0048] By having the thickness within the above range, the glass cloth having a relatively low modulus of elasticity can be easily pressed by a pressing roll. Even when the film is wound while being pressed, the occurrence of wrinkles during winding can be suppressed.

[0049] In the second embodiment of the core tube for glass cloth, the second belt-like convex portion includes an adhesive layer having a predetermined thickness. Other than that, the first embodiment can have the same configuration as in the first embodiment. The first and second belt-shaped protrusions may have the same length and material. Furthermore, the core tube can also have the same configuration.

[0050] [Glass cloth] The elastic modulus of the glass cloth wound around the core tube for glass cloth of this embodiment is preferably 5 The pressure is preferably 0 GPa to 70 GPa, more preferably 50 to 63 GPa, and even more preferably The elastic modulus of the glass cloth is 50 GPa or more, The occurrence of winding wrinkles tends to be suppressed. In addition, the elastic modulus of the glass cloth is 70 GPa or less. This makes the glass cloth softer and makes it easier for wrinkles to form when wound. Therefore, the present invention is particularly useful. In this case, the dielectric constant tends to be relatively lower. The elastic modulus can be adjusted by the composition of the glass yarn. It is possible.

[0051] The thickness of the glass cloth is 20 to 60 μm, preferably 25 to 55 μm, and more preferably The thickness of the glass cloth is preferably within the above range, and the thickness of the glass cloth is preferably within the above range. The present invention is particularly useful for glass cloths having a thickness of 6. 0 μm or less, it is easy to achieve a thinner and higher density printed wiring board. In addition, since the thickness of the glass cloth is 20 μm or more, the glass cloth The strength of the cloth is improved, and unintentional cutting of the cloth tends to be suppressed. .

[0052] The length of the glass cloth is not particularly limited and may be appropriately selected depending on the intended use of the glass cloth. The specific length of the glass cloth is usually 200 to 5000 m. The length of the lath cloth is 200m or more, so the winding of the glass cloth around the core tube is easy. As the number of wound wires increases and the weight of the resulting wound body increases, wrinkles are more likely to occur. Therefore, the present invention is particularly useful. This allows for the continuous mass production of prepregs. By limiting the length of the cross to 5000 m or less, the size and weight of the resulting winding are small. This tends to improve handling and storage.

[0053] The width of the glass cloth is not particularly limited and is appropriately selected depending on the intended use of the glass cloth. The specific width of the glass cloth is preferably 500 to 2000 mm. More preferably, it is 700 to 1800 mm, and even more preferably, it is 900 to 1600 mm. The width of the glass cloth is 500 mm or more, so that the glass cloth is axially aligned with the core tube. It becomes difficult to wind the wire so that the longitudinal direction of the wire is perpendicular to the longitudinal direction of the wire. Therefore, the present invention is particularly useful. Glass cloth with a width within the above range can be used in prepreg manufacturing without adjusting the width. It is easy to use with general-purpose resin coating machines.

[0054] The weaving structure of the glass cloth is not particularly limited, but may be, for example, a plain weave, a tan weave, or a satin weave. Furthermore, glass cloth can be made of different types of glass yarns. Among these, glass cloth having a plain weave structure is preferred. is preferred.

[0055] [Method for manufacturing glass cloth wound body] In the method for manufacturing the glass cloth wound body of this embodiment, the glass cloth is pressed by a pressing roll. This includes a step of winding the core tube for the scissor while applying pressure toward the center of the core tube.

[0056] FIG. 5 shows a diagram illustrating one aspect of the method for manufacturing the glass cloth wound body of this embodiment. In this example, the fed glass cloth is expanded to apply tension in the width direction of the glass cloth. The glass cloth passes through a pressure roll 21 and a pressure roll 22 that applies pressure in the direction of the center of the glass cloth core tube. The fiber is then wound around a core tube for glass cloth.

[0057] The pressure roll 22 applies pressure in the direction of the center of the glass cloth core tube, and the glass cloth is wound up. This can further reduce the amount of air trapped between the layers of the glass cloth. Therefore, the glass cloth in the outermost layer of the wound body and the glass cloth in the layer one layer inward from the outermost layer are This allows for a moderate frictional force to be applied between the outermost glass cloth and the winding. Even if compressive stress due to tension acts on the outermost layer, the glass cloth of the inner layer Since the material is constrained and difficult to move, the occurrence of wrinkles due to rolling is suppressed.

[0058] The pressure applied by the pressure roll is preferably 10 to 500 N / m, more preferably The pressure applied to the pressure roll is preferably 30 to 400 N / m, and more preferably 50 to 300 N / m. Therefore, by applying a pressure of 10 N / m or more, the occurrence of wrinkles is further suppressed. In addition, the pressure applied by the pressure roll is 500N / m or less. This tends to suppress fluffing of the glass cloth caused by excessive pressure.

[0059] The pressing roll is not particularly limited as long as it is a commonly used one.

[0060] The expander roll 21 applies tension to the glass cloth in the width direction, The expander roll is not particularly limited, but may be, for example, For example, tension can be applied to both ends of the glass cloth by bending it and passing it through a roll. Examples include: [Example]

[0061] The present invention will be described in more detail below using examples and comparative examples. The examples are not intended to be limiting in any way.

[0062] [Physical properties of glass cloth] The physical properties of the glass cloth, specifically, the thickness of the glass cloth, the mass of the warp and weft, The diameter of the filaments constituting the warp and weft, the number of filaments, and the weaving density of the warp and weft shall comply with JIS Measurement was performed according to R3420.

[0063] [Evaluation of wrinkles during winding 1] The occurrence of wrinkles during the winding process was checked, and the results are shown in Table 1.

[0064] [Evaluation of winding wrinkles 2] The wound bodies obtained in the examples and comparative examples were unwound at an unwinding tension of 90 N. The cloth was visually inspected to check for wrinkles and other distortions. The results are shown in Table 1.

[0065] [Method for manufacturing glass cloth A] Both the warp and weft threads are made of glass with an average filament diameter of 5 μm and 100 filaments. Using a warp yarn (elastic modulus 61GPa), an air jet loom was used, and 65 warp yarns / 25m were used. The glass cloth was woven into a green fabric with a weave density of 67 weft yarns / 25 mm. The raw fabric is heat treated to remove starch, surface treated with silane coupling agent, and then sprayed with high-pressure water. After the fiber-opening process, the width is processed to a thickness of 25 μm, length of 2000 m x width of 1290 m. Glass cloth A having a thickness of 1000 mm was obtained.

[0066] [Method for manufacturing glass cloth B] Both the warp and weft threads are made of glass with an average filament diameter of 5 μm and 100 filaments. Using a warp yarn (elastic modulus 56GPa), an air jet loom was used, and 65 warp yarns / 25m were used. The glass cloth was woven into a green fabric with a weave density of 67 weft yarns / 25 mm. The raw fabric is heat treated to remove starch, surface treated with silane coupling agent, and then sprayed with high-pressure water. After the fiber-opening process, the width is processed to a thickness of 25 μm, length of 2000 m x width of 1290 m. Glass cloth B having a thickness of 1000 mm was obtained.

[0067] [Method for manufacturing glass cloth C] Both the warp and weft threads are made of glass with an average filament diameter of 5 μm and 200 filaments. The yarn (elastic modulus 61GPa) is used, and an air jet loom is used, with 52.5 warp threads / 2 The glass cloth was woven into a gray fabric with a weave density of 52.5 threads / 25 mm and 52.5 weft threads / 25 mm. The glass cloth is subjected to heat desizing treatment, surface treatment with silane coupling agent, and high-pressure water spray. After the fiber opening process using a laser, the width is processed and the thickness is 44 μm, length 2000 m x width 1 A glass cloth C having a thickness of 290 mm was obtained.

[0068] Example 1 In FIG. 1, the longitudinal length of the first belt-shaped convex portion is set to 100% of the circumferential length of the substrate. A core tube with a diameter of 182 mm and a width of 1350 mm was used as the base material. The first belt-shaped convex portion is a PET substrate having a thickness of 30 μm and a width of 30 mm and having an adhesive layer on both sides. The distances of the two first belt-shaped convex portions from both ends of the base material 1 were 5 mm. It was set to 0 mm.

[0069] The glass cloth A was wound around the core tube to obtain a wound body. While applying the expanding force to A with the expander roll, the initial winding tension was 300N. At this time, the glass cloth was pressed toward the center of the core tube by a pressure roll. The initial pressure applied by the pressure roll was 150 N / m. Ta.

[0070] Example 2 A total of three first belt-shaped convex portions are provided on both ends and the center of the base material, and the longitudinal direction of each of the first belt-shaped convex portions is A core tube was prepared in which the length in the direction was 100% of the circumferential length of the substrate. The paper tube is 182mm in diameter and 1350mm in width, and the first belt-shaped convex part is 30μm thick. A 30 mm wide double-sided PET tape with an adhesive layer was used. The distances from the two first belt-shaped protrusions to both ends of the substrate 1 were set to 50 mm. The winding was carried out in the same manner as in Example 1, except that the above-mentioned was used.

[0071] Example 3 The same as in Example 1 except that the longitudinal length of the first belt-like protrusion was set to 80% of the circumferential length of the substrate. A core tube similar to that in Example 1 was prepared. We carried out the survey.

[0072] Example 4 In FIG. 3, the longitudinal length of the first belt-shaped convex portion is set to 100% of the circumferential length of the base material. A core tube having one second belt-shaped protrusion was prepared. A 1350 mm paper tube was used, and the first and second belt-shaped convex portions were 30 μm thick and 3 A PET double-sided tape having an adhesive layer with a thickness of 0 mm was used. The distance from each end of the substrate 1 was set to 50 mm. The film was wound up in the same manner as in Example 1.

[0073] Example 5 One second belt-shaped protrusion was added to the core tube of Example 4, making the number of second belt-shaped protrusions two in total. The added second belt-shaped convex part was next to the original second belt-shaped convex part. The winding was carried out in the same manner as in Example 1, except that the core tube was used. When winding it up, first, apply pressure to the first double-sided tape on the second belt-shaped convex part. The glass cloth is attached, and then, with tension applied to the glass cloth, the first double-sided tape is attached. Rotate the core tube about once in the opposite direction to the tape, and finally attach it to the second double-sided tape. Then glass cloth was attached.

[0074] Example 6 The first belt-shaped convex portion is made of a PET-based double-sided tape containing an adhesive layer with a pressure of 130 μm. A core tube similar to that of Example 5 was prepared. The winding was carried out in the same manner.

[0075] Example 7 The first belt-shaped convex portion is a 130 μm thick double-sided tape made of a PET substrate including an adhesive layer, and the second The belt-shaped convex part was made of double-sided tape with a thickness of 18 μm, consisting only of an adhesive layer. A core tube similar to that in Example 5 was prepared. Except for using this core tube, the same procedure as in Example 5 was carried out. , and winding was carried out.

[0076] Example 8 The first belt-shaped convex portion is a double-sided tape having a thickness of 18 μm and consisting only of an adhesive layer, and the second belt The convex portion was made of a double-sided tape with a thickness of 18 μm, which consisted only of an adhesive layer. A core tube similar to that of Example 5 was prepared. Except for using this core tube, the same procedure as in Example 5 was carried out. I did the winding.

[0077] Example 9 A core tube similar to that of Example 5 was prepared, and glass cloth B was wound around the core tube. The other conditions were the same as in Example 5, and winding was carried out.

[0078] Example 10 A core tube similar to that of Example 5 was prepared, and glass cloth C was wound around the core tube. The other conditions were the same as in Example 5, and winding was carried out.

[0079] Comparative Example 1 As shown in Figure 2, a core tube having one second belt-shaped convex portion was prepared. A paper tube with a diameter of 182 mm and a width of 1350 mm was used, and the second belt-shaped convex part was 30 μm thick and 3 A PET double-sided tape with a thickness of 0 mm and an adhesive layer was used. The film was wound up in the same manner as in Example 1.

[0080] Comparative Example 2 One second belt-shaped protrusion was added to the core tube of Comparative Example 1, making the number of second belt-shaped protrusions two in total. The added second belt-shaped convex part was next to the original second belt-shaped convex part. The second belt-shaped convex portion was a pressure-sensitive adhesive layer having a thickness of 30 μm and a width of 30 mm. The same procedure as in Example 5 was carried out except that the core tube was used. When winding the film, first, the first line of the second belt-shaped convex portion was wound up. A glass cloth is attached to the double-sided tape, and then tension is applied to the glass cloth. In this state, rotate the core tube approximately once in the opposite direction to the first double-sided tape, and finally A glass cloth was attached to the second double-sided tape.

[0081] Comparative Example 3 A φ200mm ABS resin core tube with L-groove processing to eliminate step marks is available. Winding was carried out in the same manner as in Example 1, except that the core tube was used.

[0082] Comparative Example 4 To eliminate step marks, a 1mm thick stress relief layer (cushion layer) is placed on the outer surface. In addition, a core tube made of ABS resin with a diameter of 200 mm was prepared. Winding was carried out in the same manner as in 1.

[0083] Comparative Example 5 The same as in Example 1 except that the longitudinal length of the first belt-like protrusion was set to 60% of the circumferential length of the substrate. A core tube similar to that in Example 1 was prepared. We carried out the survey.

[0084] Example 11 In FIG. 2, a core tube having one second belt-shaped convex portion was prepared. A paper tube measuring 82 mm x 1350 mm wide is used, and the second belt-shaped convex part is 18 μm thick and 30 mm wide. A double-sided tape consisting of only an adhesive layer of 1 m was used. Winding was carried out in the same manner as in Example 1, except that the core tube was used.

[0085] Example 12 One second belt-shaped protrusion was added to the core tube of Example 11, making the number of second belt-shaped protrusions two in total. The added second belt-shaped convex part was attached to the original second belt-shaped convex part. The winding was carried out in the same manner as in Example 5, except that the core tube was used. went.

[0086] Example 13 For the core tube of Example 12, the second belt-shaped convex portion was formed by only an adhesive layer having a thickness of 7 μm and a width of 30 mm. A core tube was prepared in which the double-sided tape was changed to the core tube. Winding was carried out in the same manner as in 5.

[0087] [Table 1] [Industrial Applicability]

[0088] The core tube for glass cloth of the present invention is an industrially useful core tube that is less likely to cause wrinkles during winding. Have availability.

Claims

1. A glass cloth core tube for winding a glass cloth, A substrate having a cylindrical shape; one or more first band-shaped protrusions arranged along a circumferential direction on a side surface of the base material, The longitudinal length of the first band-shaped convex portion is 75% or more of the circumferential length of the base material. Core tube for glass cloth.

2. The substrate further has one or more second band-shaped protrusions arranged on the side surface thereof along the axial direction. 、 The core tube for glass cloth according to claim 1.

3. A glass cloth core tube for winding a glass cloth, A substrate having a cylindrical shape; one or more second band-shaped protrusions arranged along the axial direction on a side surface of the base material, the second belt-shaped convex portion includes a pressure-sensitive adhesive layer having a thickness of 2 μm or more and less than 30 μm; Core tube for glass cloth.

4. The substrate further has one or more first band-shaped protrusions arranged along the circumferential direction on the side surface thereof. Ru, The core tube for glass cloth according to claim 3.

5. the first belt-shaped convex portion and / or the second belt-shaped convex portion are formed by double-sided tape; The core tube for glass cloth according to any one of claims 1 to 4.

6. The elastic modulus of the glass cloth is 50 GPa to 70 GPa. The core tube for glass cloth according to any one of claims 1 to 5.

7. A glass cloth wound body using the glass cloth core tube according to any one of claims 1 to 6. A method for producing The glass cloth is pressed toward the center of the glass cloth core tube by a pressure roll. and winding the film. Manufacturing method.

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