Manufacturing method of glass plate packing body and manufacturing device of glass plate packing body

Abstract

To suppress formation of wrinkles around a joint part of a second sheet original material after joining by properly holding the second sheet original material by a holding part and joining with a first sheet original material.SOLUTION: A manufacturing method of a glass plate packing body includes: a first manufacturing process for manufacturing a protective sheet S superimposed on a glass plate G by drawing a first sheet original material S1 from a first original material roll R1; a second manufacturing process for manufacturing the protective sheet S superimposed on the glass plate G by drawing a second sheet original material S2 from a second original material roll R2 after the first manufacturing process; a joining process for joining a first joint part S1e of the first sheet original material S1 with a second joint part S2e of the second sheet original material S2; and a holding process for holding a front side area S2f in a drawing direction and a rear side area S2g in the drawing direction relative to the second joint part S2e of the second sheet original material S2, by a front side holding part 34c and a rear side holding part 37, respectively.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a glass plate package and an apparatus for manufacturing a glass plate package for carrying out the method. [Background technology]

[0002] 2. Description of the Related Art When storing or transporting glass plates, a glass plate laminate, which is formed by alternately laminating glass plates and protective sheets, is sometimes loaded vertically or horizontally on a pallet to form a glass plate package.

[0003] This type of glass plate package is typically manufactured by cutting a sheet material (a strip-shaped sheet) pulled out from a roll of material to produce a rectangular protective sheet, and then placing this protective sheet on top of a glass plate and loading it on a pallet.

[0004] In this case, when only a small amount of sheet material remains that can be pulled out from the base material roll, the process of producing the protective sheet using this base material roll must be terminated and this base material roll (used base material roll) must be replaced with a new base material roll.

[0005] As a method for this replacement, Patent Document 1 discloses joining a part of the first sheet base material of a used base material roll (first base material roll) to an end (the end on the front side in the pulling direction) of the second sheet base material of a new base material roll (second base material roll) using a joining device.

[0006] Furthermore, the same document discloses that the above-mentioned joining device includes a holding portion that holds the front end portion of the second sheet base material in the pull-out direction by suction, and a pressing member that presses a part of the first sheet base material against the end portion of the second sheet base material to join the two sheet base materials. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2021-172461 A Summary of the Invention [Problem to be solved by the invention]

[0008] Incidentally, the holding part disclosed in Patent Document 1 is a hollow member the inside of which is connected to a suction pump, and has a plurality of suction holes opened in its holding surface. Therefore, in order to reliably hold the end portion of the second sheet base material with the holding part, it is necessary to completely cover the plurality of suction holes with the end portion of the second sheet base material, as shown in Figure 3 of the same document.

[0009] To meet this requirement, the edge of the end of the second sheet material on the front side in the pulling direction (the left side in the figure) needs to protrude from the multiple suction holes to the front side in the pulling direction. Therefore, this protruding portion is not held by the holding portion. Moreover, the rear side of the end of the second sheet material in the pulling direction is not held by the holding portion (multiple suction holes).

[0010] In this state, if a part of the first sheet base material is pressed against the end of the second sheet base material to join the two sheet base materials, wrinkles will occur around the joint of the second sheet base material, which can cause the second sheet base material to twist when the second sheet base material is pulled out of the second base material roll after joining, hindering the subsequent production work of the protective sheet.

[0011] From the above viewpoints, an object of the present invention is to appropriately hold the second sheet base material using a holding portion and join it to the first sheet base material, thereby suppressing the formation of wrinkles around the joint of the second sheet base material after joining, and allowing the subsequent production work of the protective sheet to be carried out smoothly and without hindrance. [Means for solving the problem]

[0012] (1) A first aspect of the present invention devised to solve the above-mentioned problems is a method for manufacturing a glass plate package, comprising: a first production step of pulling out a first sheet base material from a first base material roll and cutting it to produce a protective sheet to be overlaid on a glass plate; a second production step of pulling out a second sheet base material from a second base material roll after the first production step and cutting it to produce a protective sheet to be overlaid on a glass plate; a joining step of joining a first joint portion present in a part of the first sheet base material to a second joint portion present in a front end portion of the second sheet base material in the pull-out direction after the first production step and before the second production step; and a holding step of holding the front end portion of the second sheet base material in the pull-out direction after the first production step and before the joining step, wherein the holding step is characterized in that a region of the second sheet base material forward of the second joint portion in the pull-out direction is held by a front holding portion, and a region of the second sheet base material rearward of the second joint portion in the pull-out direction is held by a rear holding portion.

[0013] According to this configuration, the region of the second sheet base material in front of the second joint portion and the region of the second sheet base material in the front of the second joint portion are held by the front holding portion and the rear holding portion, respectively, so that wrinkles are less likely to occur in the region of the second sheet base material held by these portions and between these holding portions. Then, by joining the second joint portion and the first joint portion in this state, the formation of wrinkles around the joint portion of the second sheet base material after joining is suppressed. As a result, twisting of the second sheet base material when the second sheet base material is pulled out from the second base material roll after joining is prevented, and the subsequent production work of the protective sheet (work in the second production process) is carried out smoothly and without hindrance.

[0014] (2) In the above configuration (1), in the joining process, it is preferable that a first holding portion abutting the first joint portion and a second holding portion arranged between the front holding portion and the rear holding portion and abutting the second joint portion are disposed opposite each other, and the first joint portion and the second joint portion are joined by sandwiching them between the first holding portion and the second holding portion.

[0015] In this way, the four components, the first holding portion, the second holding portion, the front holding portion, and the rear holding portion, are appropriately positioned, so that the joining of the first joint portion and the second joint portion can be performed accurately and efficiently.

[0016] (3) In the above configuration (1) or (2), it is preferable to provide a reversing step of switching the positions of the first base material roll and the second base material roll after the holding step and before the joining step.

[0017] In this way, the first base material roll and the second base material roll can be replaced efficiently. Moreover, when the reversing step is performed, the second base material sheet is held at least at two points in the pulling direction by the front holding portion and the rear holding portion, so that the second sheet base material is less likely to be misaligned in the holding position during reversal, or even wrinkles are less likely to occur.

[0018] (4) In any of the above configurations (1) to (3), it is preferable to further include a first holding portion that is arranged in parallel with the first pressing portion and holds a rear region of the first joint portion of the first sheet material in the pulling direction.

[0019] In this way, the first sheet material is also held in place by the first holding portion, so that the joining operation between the first joining portion and the second joining portion can be performed more appropriately.

[0020] (5) In any of the configurations (1) to (4) above, it is preferable that a cutting step is provided after the first production step and before the inversion step, in which the first sheet base material is cut and the pull-out side sheet portion is separated from the first sheet base material, the first joint portion being present at the rear end portion in the pull-out direction of the pull-out side sheet portion in the cutting step, and the first holding portion holds the area of ​​the first sheet base material rearward in the pull-out direction than the first joint portion after cutting and separating the first sheet base material and before the inversion step.

[0021] In this way, the reversing step is performed in a state in which the first holding section holds a region on the rear side in the pull-out direction of the first joint section at the rear end in the pull-out direction of the pull-out side sheet portion obtained by cutting and separating the first sheet base material. Therefore, in the reversing step, the first base material roll and the second base material roll are replaced without the first sheet base material being pulled out from the first base material roll. This prevents the first sheet base material from getting in the way during reversing, making the reversing step even more efficient and simple, and simplifying the configuration of the reversing device for performing the reversing step.

[0022] (6) In any of the configurations (1) to (5) above, it is preferable that the first pressing portion has a heating portion and the second pressing portion does not have a heating portion, and that in the joining step, the first joining portion and the second joining portion are thermally welded by the heating portion.

[0023] In this way, it is not necessary to apply adhesive or apply double-sided tape, and the work of replacing the base material roll can be simplified. Moreover, by combining this with the configuration of (5) above, it is not necessary to reverse the first pressing unit (heating unit) in the reversing step, and wiring for heating can be simplified.

[0024] (7) In any of the above configurations (1) to (6), the second pressing portion is preferably made of heat-resistant rubber.

[0025] In this way, when the first and second bonding parts are bonded together by the first pressing part having a heating part and the second pressing part made of heat-resistant rubber, problems such as damage to the second pressing part due to heat can be avoided. Moreover, the first and second bonding parts are evenly pressed down over their entire surfaces due to the cushioning properties of the second pressing part, so that an appropriate bonding state can be obtained, which also suppresses the occurrence of wrinkles.

[0026] (8) In any one of the above configurations (1) to (7), it is preferable that in the holding step, the second pressing portion does not hold the second bonding portion.

[0027] In this way, if the second holding portion is made of heat-resistant rubber, it becomes necessary to form, for example, suction holes or the like in the heat-resistant rubber, and in that case the suction holes or the like get in the way and make proper joining difficult; however, with the configuration herein, such a problem does not occur.

[0028] (9) In any of the configurations (1) to (8) above, in the joining process, it is preferable to release the hold of the second sheet base material after the first pressing portion has been separated from the first joining portion after the thermal welding of the first joining portion and the second joining portion has been completed.

[0029] In this way, after the first pressing part (heating part) has completed heat welding, the first pressing part separates from the first joint part while the second sheet base material is being held. This avoids the problem of the first joint part moving together with the first pressing part while being attached to the first pressing part by heat. Therefore, the process after heat welding can be carried out smoothly without being complicated.

[0030] (10) In any one of the above configurations (1) to (9), the first sheet base material and the second sheet base material are preferably strip-shaped foamed resin sheets.

[0031] In this way, the first bonding portion and the second bonding portion can be heat-welded appropriately and reliably.

[0032] (11) In any of the above configurations (1) to (10), it is preferable that the first pressing portion is divided into a plurality of portions in the width direction of the first sheet base material, and gaps are formed between the plurality of first pressing portions.

[0033] In this way, there is no need to heat-weld the first sheet base material (first joint) and the second sheet base material (second joint) along the entire width direction, and the amount of energy (electrical energy, etc.) required for heat welding can be reduced.

[0034] (12) In any of the above configurations (1) to (11), the holding surfaces of the front holding portion and the rear holding portion that hold the second sheet material may be parallel to a pressing surface of the second pressing portion that presses the second joint portion.

[0035] In this way, the second sheet material is held by the holding surfaces of the front holding member and the rear holding member in a state where the second sheet material is extended in the same direction, so that the holding operation is reliable.

[0036] (13) In any one of the configurations (1) to (12) above, a holding surface on which the rear holding portion holds the second sheet material is parallel to a pressing surface on which the second pressing portion presses the second joint portion, A holding surface along which the front holding portion holds the second sheet material may be inclined in a direction away from the first pressing portion or may be perpendicular to a pressing surface along which the second pressing portion presses the second joint portion.

[0037] In this way, the holding surface of the rear holding part, which is parallel to the holding surface of the second holding part, and the holding surface of the front holding part are oriented in different directions, so that the length of the entire holding surface in the direction parallel to the holding surface of the second holding part can be shortened, thereby making it possible to make the holding device that constitutes these holding parts more compact.

[0038] (14) In any one of the above configurations (1) to (13), it is preferable that the first sheet material and the second sheet material each have a width dimension of 1100 mm or more and 3500 mm or less.

[0039] When the width direction lengths of both sheet materials are long like this, it is common for wrinkles to easily occur when the first joint portion and the second joint portion are joined; however, according to the configuration of the present invention, it is possible to adequately deal with the occurrence of such wrinkles.

[0040] (15) A second aspect of the present invention devised to solve the above-mentioned problems is a manufacturing apparatus for glass plate packages, the manufacturing apparatus including: a protective sheet production device that produces a protective sheet to be overlaid on a glass plate by pulling out a first sheet base material from a first base material roll and cutting it, and, after production of the protective sheet from the first base material roll is completed, produces a protective sheet to be overlaid on a glass plate by pulling a second sheet base material from a second base material roll and cutting it; a joining device that joins a first joint portion present in a part of the first sheet base material to a second joint portion present at a front end portion in the pull-out direction of the second sheet base material after production of the protective sheet from the first base material roll is completed and before production of the protective sheet from the second base material roll is started; and a holding device that holds the front end portion in the pull-out direction of the second sheet base material after production of the protective sheet from the first base material roll is completed and before joining by the joining device is started, the holding device being configured to hold a region of the second sheet base material forward of the second joint portion in the pull-out direction with a front holding portion, and to hold a region of the second sheet base material rearward of the second joint portion in the pull-out direction with a rear holding portion.

[0041] With this manufacturing apparatus, substantially the same effects can be obtained as with the manufacturing method (1) above. Effect of the Invention

[0042] According to the present invention, since the second sheet base material is appropriately held by the holding portion and joined to the first sheet base material, it is possible to prevent wrinkles from being formed around the joint of the second sheet base material after joining, which allows the subsequent production work of the protective sheet to be carried out smoothly without any hindrance. [Brief description of the drawings]

[0043] [Figure 1] 1 is a schematic side view showing an overall configuration of a manufacturing apparatus for a glass plate package according to a first embodiment of the present invention. [Diagram 2] 1 is a plan view showing a sheet material supplying device which is a component of a manufacturing apparatus for a glass plate package according to a first embodiment of the present invention. FIG. [Diagram 3]1 is a side view showing a sheet material supplying device which is a component of the manufacturing apparatus for a glass sheet package according to a first embodiment of the present invention. FIG. [Figure 4] 1 is a vertical sectional side view showing a first pressing unit which is a component of the manufacturing apparatus for a glass plate package according to a first embodiment of the present invention. FIG. [Diagram 5] 5 is a bottom view of the first pressing unit in the state shown in FIG. 4, as viewed from below. [Figure 6] 2 is a vertical sectional side view showing a second pressing unit which is a component of the manufacturing apparatus for a glass plate package according to the first embodiment of the present invention. FIG. [Figure 7] 7 is a bottom view of the second pressing unit in the state shown in FIG. 6, as viewed from below. [Figure 8] 7 is a front view of the second pressing unit in the state shown in FIG. 6, viewed from the left side. [Figure 9] FIG. 2 is a side view showing a state in which a cutting step is being performed in the method for producing a glass plate package according to the first embodiment of the present invention. [Figure 10] FIG. 2 is a side view showing a state after the cutting step and before the joining step in the method for producing a glass plate package according to the first embodiment of the present invention. [Figure 11] FIG. 2 is a side view showing a state in which a cutting step is being performed in the method for producing a glass plate package according to the first embodiment of the present invention. [Figure 12] FIG. 2 is an enlarged vertical sectional side view showing a state in which a joining step is being performed in the manufacturing method for a glass plate package according to the first embodiment of the present invention. [Figure 13] FIG. 2 is an enlarged vertical sectional side view showing a state after a joining step in the manufacturing method of the glass plate package according to the first embodiment of the present invention. [Figure 14] FIG. 2 is an enlarged vertical sectional side view showing a state after a joining step in the manufacturing method of the glass plate package according to the first embodiment of the present invention. [Figure 15] FIG. 10 is an enlarged vertical sectional side view showing a state in which a modified example of the joining step is carried out in the manufacturing method for the glass plate package according to the first embodiment of the present invention. [Figure 16]FIG. 4 is a side view showing a sheet material supplying device which is a component of the manufacturing apparatus for a glass sheet package according to the second embodiment of the present invention. [Figure 17] 10 is a side view showing the operation of a sheet material supplying device which is a component of the glass plate package manufacturing apparatus according to the second embodiment of the present invention. FIG. [Figure 18] 10 is a side view showing the operation of a sheet material supplying device which is a component of the glass plate package manufacturing apparatus according to the second embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0044] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a manufacturing apparatus for a glass sheet package and a manufacturing method for a glass sheet package according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0045] [First embodiment] FIG. 1 is a side view showing a manufacturing apparatus 1 for manufacturing a glass sheet package according to a first embodiment of the present invention. As shown in the figure, the manufacturing apparatus 1 includes a protective sheet manufacturing device 2 that produces a protective sheet S by drawing out a first sheet material S1 from a first material roll R1 and cutting it. After finishing the manufacturing of the protective sheet S from the first material roll R1, the protective sheet manufacturing device 2 draws out a second sheet material S2 from a second material roll R2 and cuts it to produce the protective sheet S. Furthermore, the manufacturing apparatus 1 stacks a glass sheet G on the protective sheet S and loads it on a packaging pallet P. Through the above operations, the manufacturing apparatus 1 manufactures a glass sheet package 12. In the following description, the direction perpendicular to the paper surface in FIG. 1 is referred to as the "width direction", the direction of the arrow A in FIG. 1 is referred to as the "right side", and the direction of the arrow B is referred to as the "left side".

[0046] The glass sheet G is obtained by cutting a ribbon-shaped glass continuously formed by a forming device (not shown) at a predetermined length in the longitudinal direction and cutting and removing unnecessary portions at both ends in the width direction. The glass sheet G is used for various displays such as liquid crystal displays and organic EL displays, and as a glass substrate or cover glass for solar cells. The forming device may be one that performs a downdraw method such as an overflow downdraw method or a slot downdraw method, or may be one that performs a method other than the downdraw method, such as a float method. The dimensions of the glass sheet G are, for example, 1000 mm or more and 3500 mm or less on one side.

[0047] The first base material roll R1 and the second base material roll R2 are respectively formed by winding the first sheet base material S1 and the second sheet base material S2 around a core. In this embodiment, foamed resin sheets made of a resin mainly composed of polyethylene are used as the sheet base materials S1 and S2. The width direction dimensions of the sheet base materials S1 and S2 are 1100 mm or more and 3500 mm or less.

[0048] The protective sheet manufacturing apparatus 2 includes a protective sheet cutting device 3 that cuts the sheet base materials S1, S2 pulled out from base material rolls R1, R2 to manufacture the protective sheet S, a pair of first gripping portions 4 and a pair of second gripping portions 5 that are arranged below the cutting device 3 and hold the protective sheet S after it has been cut, and guide members 6, 7 that movably support the gripping portions 4, 5.

[0049] The protective sheet cutting device 3 is configured to cut the sheet materials S1, S2 with its cutting blade 3a while holding a part of the sheet materials S1, S2 with the gripping portions 4, 5, respectively.

[0050] The pair of first gripping portions 4 are configured to grip both widthwise ends of the upper portion of the protective sheet S. The pair of second gripping portions 5 are configured to grip both widthwise ends of the lower portion of the protective sheet S. Each of the gripping portions 4, 5 has a clamp mechanism that grips the widthwise ends of the protective sheet S obtained by cutting the sheet materials S1, S2.

[0051] The guide members 6, 7 include a first guide member 6 that moves the gripping portions 4, 5 toward and away from the packing pallet P in the left-right direction, and a second guide member 7 that moves the first guide member 6 up and down.

[0052] The first guide member 6 is an elongated body that protrudes to the right from the second guide member 7. The first guide member 6 is inclined downward at a predetermined angle with respect to the horizontal direction. The first guide member 6 supports the gripping portions 4, 5 on its upper surface side so that they can slide freely in their longitudinal direction (left-right direction). The first guide member 6 includes a drive mechanism for moving the gripping portions 4, 5 left and right.

[0053] The second guide member 7 is an elongated body extending in the vertical direction. The second guide member 7 is inclined at a predetermined angle with respect to the vertical direction. The second guide member 7 supports one end of the first guide member 6 so as to be vertically movable. The first guide member 6 is supported by the second guide member 7 so as to be perpendicular to the second guide member 7. The second guide member 7 has a drive mechanism for moving the first guide member 6 up and down.

[0054] The second guide member 7 is supported by being suspended from a base portion 8 arranged above the packing pallet P. The base portion 8 is divided into two parts, a first base portion 9 and a second base portion 10, above and below. The first base portion 9 is installed in a fixed position. The second base portion 10 is supported on the underside of the first base portion 9 so as to be movable in the left-right direction.

[0055] The manufacturing apparatus 1 also includes, as components for manufacturing the glass sheet package 12, a conveying section 13 that conveys the glass sheet G and a packaging section 14 that packages the glass sheet G on a packaging pallet P.

[0056] The transport unit 13 is configured as a transport device including a plurality of glass plate holding units 15 that move the glass plate G. Each glass plate holding unit 15 can move three-dimensionally by a robot arm or other various moving mechanisms. Each glass plate holding unit 15 has a clamping mechanism 16 that can hold the glass plate G. The transport unit 13 holds an upper portion of the glass plate G by the clamping mechanism 16 of the glass plate holding unit 15, and transports the glass plate G so that one main surface of the glass plate G is perpendicular to the moving direction.

[0057] The packaging section 14 includes the above-mentioned protective sheet producing device 2 and a sheet material supplying device 17 that supplies the sheet materials S1, S2 to the producing device 2.

[0058] The packing pallet P arranged in the packing section 14 has a first support surface Pa that supports the main surface of the glass plate G, and a second support surface Pb that supports the lower end of the glass plate G. The first support surface Pa and the second support surface Pb intersect at an angle of 90°. By the operation of the conveying section 13 and the protective sheet manufacturing device 2, the glass plates G and the protective sheets S are stacked alternately in a vertical position on the packing pallet P. In this way, a glass plate package 12 is obtained.

[0059] The sheet base material supplying device 17 has a function of replacing the first base material roll R1 and the second base material roll R2. The sheet base material supplying device 17 includes a support frame 18 that supports the first base material roll R1 and the second base material roll R2 while keeping them apart, and a holding frame 19 that holds the front end S2a in the pull-out direction of the second sheet base material S2 pulled out from the second base material roll R2. The sheet base material supplying device 17 further includes a joining device 20 that joins the first sheet base material S1 related to the first base material roll R1 and the second sheet base material S2 related to the second base material roll R2, a base material cutting device 21 that cuts the first sheet base material S1, and a sensor (not shown) that measures the remaining amount of the first sheet base material S1 in the first base material roll R1.

[0060] In addition, on the path from the sheet material supplying device 17 to the protective sheet manufacturing device 2, various rollers are arranged to smoothly feed and move the sheet materials S1, S2.

[0061] 1 and 2, the support frame 18 includes a pair of support frame members 18a that are disposed opposite each other and are elongated in the left-right direction, and two connecting frame members 18b that are elongated in the width direction and connect the support frame members 18a to each other. The support frame 18 is configured to be driven to rotate around a support shaft 22 by the operation of a drive device (not shown). The support shaft 22 is installed at a fixed position. Each of the support frame members 18a and each connecting frame member 18b is made of, for example, metal.

[0062] A first base material roll R1 and a second base material roll R2 are supported on both left and right ends of the support frame 18. More specifically, the winding core of the first base material roll R1 is rotatably supported by a first shaft portion 18c that connects the right end portions of the pair of support frames 18a. The winding core of the second base material roll R2 is rotatably supported by a second shaft portion 18d that connects the left end portions of the pair of support frames 18a. The support frame 18 performs a reversing operation to swap the positions of the first base material roll R1 and the second base material roll R2 by its rotation.

[0063] The holding frame 19 has a pair of holding frame members 19a disposed opposite each other on the widthwise outer side of the support frame 18. The right ends of these holding frames 19a are rotatably supported by the support shaft 22 and extend toward the left. The left ends of these holding frames 19a are located to the left of the left end of the support frame 18. A second pressing unit 24 extending in the widthwise direction is fixed to the left ends of these holding frames 19a via an auxiliary frame member 19b.

[0064] The holding frame 19 is configured to be rotated by the operation of a drive device (not shown). Each holding frame member 19a and each auxiliary frame member 19b are made of, for example, metal. Each holding frame member 19a and each supporting frame member 18a are arranged in parallel. In this embodiment, the holding frame member 19 and the supporting frame member 18 are configured to be rotated independently, but may be configured to be rotated integrally.

[0065] 2 and 3, the joining device 20 includes a first pressing unit 23 disposed above the first sheet base material S1 pulled out to the right from the first base material roll R1. The joining device 20 also includes the above-mentioned second pressing unit 24 disposed around the front end S2a in the pulling direction of the second sheet base material S2 pulled out to the left from the second base material roll R2. For convenience, the figures show a state in which the second pressing unit 24 holds the front end S2a in the pulling direction of the second sheet base material S2.

[0066] The first pressing unit 23 is configured to be moved up and down by a driving device 25 (air cylinder 25 in the illustrated example) installed at a fixed position. As shown in Fig. 2, a plurality of air cylinders 25 are arranged at intervals along the width direction. Also, as shown in the figure, the first pressing unit 23 is elongated in the width direction and is disposed so as to extend over the entire width direction of the first sheet material S1.

[0067] As shown in FIG. 4, the first pressing unit 23 includes a heater 26 as a heating section. In this embodiment, a lower end 27 of the heater 26 corresponds to a first pressing section, and a lower end surface 27a of the first pressing section 27 corresponds to a first pressing surface. The first pressing unit 23 also includes a hollow first box body 28. The heater 26 is disposed on the right side of the first box body 28. The heater 26 and the first box body 28 are fixed to the lower surface of a support substrate 29. The left-right length of the heater 26 is 1 / 3 to 2 / 3 of the left-right length of the support substrate 29. The support substrate 29 is connected to the lower end of the piston rod 25a of the air cylinder 25. The first box body 28 has a rectangular cross section and is made of, for example, metal. A gap 30 is formed between the heater 26 and the first box body 28, but this gap 30 is not necessary if the heat of the heater 26 does not cause the first sheet base material S1 to change quality (thermal melt, etc.) through the first box body 28. Also, a heat insulating material may be provided in the gap 30. For convenience, other figures such as Figs. 1, 2 and 3 show an example in which this gap 30 is not present. Also, in the example shown in Fig. 4, the entire member 26 having the first pressing portion 27 is configured as a heater, but only the lower portion or the lower end portion of the member 26 having the first pressing portion 27 may be configured as a heater.

[0068] The internal space 31 of the first box body 28 is maintained in a negative pressure state by a suction pump (not shown). A plurality of suction holes 32 for sucking the first sheet material S1 are formed in the lower end wall portion 28a of the first box body 28. Therefore, in this embodiment, the lower end wall portion 28a of the first box body 28 corresponds to the first holding portion, and the lower end surface 28b of the first holding portion 28a corresponds to the first holding surface. The first holding surface 28b and the first pressing surface 27a are located on the same plane. The dimension of the suction holes 32 is, for example, 4 mm or more and 10 mm or less. The pitch of the suction holes 32 is, for example, 10 mm or more and 300 mm or less.

[0069] 5 is a bottom view of the first pressing unit 23 as viewed from below. As shown in the figure, the heater 26 and the first box body 28 are divided into a plurality of parts in the width direction, and gaps 33 are formed between the parts along the width direction. The divided heater 26 and the first box body 28 are arranged from one end S1x in the width direction of the first sheet base material S1 to the other end S1y in the width direction. The first box body 28 may be continuous without being divided in the width direction. In this embodiment, the first holding device that holds the first sheet base material S1 is composed of the first box body 28 and a suction pump.

[0070] As shown in FIG. 6, the second pressing unit 24 has a hollow second box 34. The second box 34 has a rectangular cross section and is made of, for example, metal. The internal space 35 of the second box 34 is maintained in a negative pressure state by a suction pump (not shown). A plurality of suction holes 36 are formed in the right part of the lower end wall 34a of the second box 34. A rubber plate-like body 37 is attached to the lower end surface of the region of the lower end wall 34a where the suction holes 36 are formed. A plurality of suction holes 38 are also formed in this rubber plate-like body 37 at the same positions as the above-mentioned suction holes 36. The dimensions of the suction holes 36, 38 are, for example, 4 mm or more and 10 mm or less. The pitch of the suction holes 36, 38 is, for example, 10 mm or more and 300 mm or less. In addition, a heat-resistant rubber plate-like body 39 is attached to the lower end surface of the region of the lower end wall 34a of the second box 34 where the suction holes 36 are not formed. The heat-resistant rubber plate-like body 39 has better heat resistance than the rubber plate-like body 37. For example, fluororubber or silicone rubber can be used as the heat-resistant rubber. In the lower end wall portion 34a of the second box body 34, the left-right length of the region in which the suction holes 36 are formed is 1 / 3 to 2 / 3 of the left-right length (total length) of the lower end wall portion 34a. Therefore, the left-right length of the rubber plate-like body 37 is also 1 / 3 to 2 / 3 of the left-right length of the lower end wall portion 34a, and the left-right length of the heat-resistant rubber plate-like body 39 is also 1 / 3 to 2 / 3 of the left-right length of the lower end wall portion 34a. Furthermore, a plurality of suction holes 40 are formed in the lower portion of the left side wall portion 34b of the second box body 34. In this embodiment, the heat-resistant rubber plate-like body 39 corresponds to the second pressing portion, and the lower end surface 39a of the second pressing portion 39 corresponds to the second pressing surface. Moreover, it is preferable that the left-right dimensions of the first pressing surface 27a and the second pressing surface 39a are substantially the same.

[0071] FIG. 7 is a bottom view of the second pressing unit 24 as viewed from below. FIG. 8 is a front view of the second pressing unit 24 as viewed from the left side. As shown in FIG. 7 and FIG. 8, the second box body 34 is arranged from one end S2x in the width direction of the second sheet base material S2 to the other end S2y in the width direction. Therefore, as shown in FIG. 7, the rubber plate-like body 37 and the heat-resistant rubber plate-like body 39 are also arranged from one end S2x in the width direction of the second sheet base material S2 to the other end S2y in the width direction. In addition, the suction holes 38 of the rubber plate-like body 37 and the suction holes 36 of the lower end wall portion 34a of the second box body 34 are also arranged from one end S2x in the width direction of the second sheet base material S2 to the other end S2y in the width direction. 8, the formation area 34c of the suction holes 40 in the side wall portion 34b of the second box body 34 is also arranged from one end S2x in the width direction of the second sheet base material S2 to the other end S2y in the width direction. In this embodiment, the formation area 34c of the suction holes 40 in the side wall portion 34b of the second box body 34 corresponds to the front holding portion, and the rubber plate-like body 37 corresponds to the rear holding portion. Also, the left end surface 34d of the front holding portion 34c shown in FIG. 6 corresponds to the front holding surface, and the lower end surface 37a of the rear holding portion 37 corresponds to the rear holding surface. The front holding surface 34d and the rear holding surface 37a form a right angle. The rear holding surface 37a and the second pressing surface 39a are located on the same plane. In this embodiment, the second holding device that holds the second sheet base material S2 is composed of the second box body 34, the rubber plate-like body 37, and the suction pump.

[0072] As shown in Figs. 2 and 3, the base material cutting device 21 has a cutting blade 21a arranged above the first sheet base material S1. The cutting blade 21a is held by a driving device (not shown) so as to be movable up and down. The cutting blade 21a is arranged to protrude outward in the width direction from one end S1x and the other end S1y of the first sheet base material S1. The cutting blade 21a is arranged near the left side of the first box body 28 (first holding portion 28a) in the first pressing unit 23. More specifically, the distance L1 between the cutting edge 21aa of the cutting blade 21a and the first box body 28 is 5 mm or more and 30 mm or less. The base material cutting device 21 also has a receiving member 41 arranged below the first sheet base material S1. The receiving member 41 receives a pressing force from the first pressing unit 23 when the first sheet base material S1 is cut by the cutting blade 21a. Therefore, the receiving member 41 is also disposed so as to protrude outward in the width direction from one width end S1x and the other width end S1y of the first sheet base material S1. The receiving member 41 is configured to move forward toward the first sheet base material S1 and move backward toward the retracted position by a drive device (not shown).

[0073] Next, a method for producing a glass plate package carried out using the production apparatus 1 having the above-mentioned configuration will be described.

[0074] This manufacturing method includes a first manufacturing process and a second manufacturing process. In the first manufacturing process, a first sheet material S1 is pulled out from a first material roll R1 and cut to produce a protective sheet S. In the second manufacturing process, after the first manufacturing process, a second sheet material S2 is pulled out from a second material roll R2 and cut to produce a protective sheet S.

[0075] Furthermore, the present manufacturing method includes a holding step, a cutting step, a reversing step, and a joining step, which are steps subsequent to the first manufacturing step and prior to the second manufacturing step.

[0076] The holding step and the cutting step are both performed before the reversing step. Either the cutting step or the holding step may be performed first. Both steps are performed after a sensor detects that the remaining amount of the first sheet base material S1 on the first base material roll R1 has become equal to or less than a predetermined amount.

[0077] In the holding step, a front end portion S2a in the pulling direction of the second sheet material S2 is held by the second pressing unit 24, as shown in FIG.

[0078] In the cutting process, the first sheet material S1 being drawn out from the first sheet material roll R1 is cut at a predetermined position using the first pressing unit 23 and the material cutting device 21. More specifically, in the cutting process, as shown in FIG. 9, the first sheet material S1 is cut by the cutting blade 21a while being clamped between the first pressing unit 23 and the receiving member 41. In this case, the left-right length of the first pressing unit 23 and the left-right length of the receiving member 41 are equal, and the cutting blade 21a is disposed near the left side of the first pressing unit 23. Therefore, in the drawing direction rear end S1b of the drawing side sheet portion S1a of the first sheet material S1 after cutting, the protruding portion S1c to the left side from the first box body 28 has a short length. At this point, the first holding portion 28a of the first pressing unit 23 holds the drawing direction rear end S1b of the drawing side sheet portion S1a of the first sheet material S1 by suction. After this, the receiving member 41 moves backward toward the retracted position. Even when the receiving member 41 moves backward, the pull-out side sheet portion S1a does not sag, and the pull-out direction rear end portion S1b continues to be held by the first holding portion 28a. This state is maintained until the joining process, which is the subsequent process. In this cutting process, the heater 26 of the first pressing unit 23 does not have to be heated, but in this embodiment, the heater 26 is always heated.

[0079] The reversing process is performed after the holding process and the cutting process and before the joining process. In the reversing process, the support frame 18 and the holding frame 19 in the state shown in FIG. 3 rotate 180° simultaneously at the same speed in the direction indicated by the symbol X in the figure. This causes the positions of the first base material roll R1 and the second base material roll R2 to be swapped as shown in FIG. 10. Therefore, in the following description of the second pressing unit 24 after the reversing process, "upper" and "lower" are swapped, and "right" and "left" are swapped, in comparison with the description before the reversing process described above.

[0080] The joining process is performed after the reversing process. The joining process is performed using the joining device 20. More specifically, in the joining process, the first pressing unit 23 and the second pressing unit 24 are moved closer to each other from the state shown in FIG. 10, so that the first sheet base material S1 and the second sheet base material S2 come into contact with each other as shown in FIG. 11 and FIG. 12. In this case, it is preferable that the first pressing unit 23 moves downward, but the second pressing unit 24 may move upward. At this point, as shown in FIG. 12, the first joining portion S1e of the first sheet base material S1 and the second joining portion S2e of the second sheet base material S2 are joined (thermally welded) by the heat of the heater 26. Here, the first joining portion S1e is a portion that comes into contact with the first pressing surface 27a of the heater 26 at the rear end portion S1b in the pulling direction of the pull-out side sheet portion S1a of the first sheet base material S1. The second bonding portion S2e is a portion that contacts the first bonding portion S1e at the front end portion S2a in the pulling direction of the second sheet base material S2. The second bonding portion S2e contacts the second pressing surface 39a of the heat-resistant plate-like body 39. During this thermal welding, it is preferable that a pressing force is applied in the thickness direction to the first bonding portion S1e and the second bonding portion S2e.

[0081] At this time, the region S2f in front of the second joint S2e in the pulling direction of the second sheet base material S2 is held by suction by the front holding portion 34c, and the region S2g in the rear of the second joint S2e in the pulling direction is held by suction by the rear holding portion 37. These holding by suction are performed in the holding step described above. Also, the region S1g in the rear of the first joint S1e in the pulling direction of the rear end portion S1b of the pull-out side sheet portion S1a of the first sheet base material S1 is held by suction by the first holding portion 28a. This holding by suction is performed in the cutting step described above. In this embodiment, the second pressing surface 39a and the rear holding surface 37a are located on the same plane, but in order to reliably apply a pressing force in the thickness direction to the first joint S1e and the second joint S2e, the rear holding surface 37a may be located 5 to 20 mm below the second pressing surface 39a. For the same reason, the first holding surface 28b may be positioned above the first pressing surface 27a by the same length. Either one of these two measures may be adopted, or both may be adopted.

[0082] After that, as shown in FIG. 13, the first holding portion 28a of the first pressing unit 23 is released from the suction, and the first pressing unit 23 and the second pressing unit 24 are separated, so that the first holding surface 28b and the first pressing surface 27a are separated from the first sheet base material S1. After that, as shown in FIG. 14, the front holding portion 34c and the rear holding portion 37 of the second pressing unit 24 are released from the suction, and the second sheet base material S2 is separated from the front holding surface 34d, the rear holding surface 37a, and the second pressing surface 39a. At this point, it is preferable to remove the hanging portion S2h of the second sheet base material S2 by cutting. As a result, the pull-out side sheet portion S1a of the first sheet base material S1 and the second sheet base material S2 are connected by thermal welding, so that the second sheet base material S2 can be pulled out from the second base material roll R2 and supplied to the protective sheet manufacturing device 2. After that, the second manufacturing process can be performed using the second base material roll R2.

[0083] In addition, when the remaining amount of the second sheet base material S2 falls below a predetermined amount as a result of the second production process being carried out, the second base material roll R2 and the second sheet base material S2 are regarded as the first base material roll R1 and the first sheet base material S1, and the new base material roll and sheet base material are regarded as the second base material roll R2 and the second sheet base material S2, and the same processes as those already described are repeatedly carried out.

[0084] According to the first embodiment having the above configuration, the following advantageous effects can be obtained.

[0085] In the joining step, the region S2f in front of the second joint S2e in the pulling direction and the region S2g in the rear of the pulling direction are held by the front holding portion 34c and the rear holding portion 37, respectively, so that wrinkles are unlikely to occur in the regions of the second sheet base material S2 held by these and between these holding regions (above the second pressing surface 39a). In this state, the second joint S2e and the first joint S1e are joined (thermally welded), so that wrinkles are prevented from forming around the heat-welded portion after joining. As a result, twisting of the second sheet base material S2 when pulling out the second sheet base material S2 from the second base material roll R2 after joining is prevented, and the subsequent production work of the protective sheet S (the work in the second production step) is performed smoothly without any hindrance.

[0086] Since the first sheet base material S1 is cut in the cutting process before the reversing process, in the subsequent reversing process, the first sheet base material S1 is not pulled out from the first base material roll R1, and the first base material roll R1 and the second base material roll R2 are replaced with each other. This prevents the first sheet base material S1 from getting in the way during reversing, making the reversing process more efficient and simple, and simplifying the configuration of the reversing device for carrying out the reversing process.

[0087] In the reversing step, since there is no need to perform the reversing operation of the heater 26, wiring for heating and the like can be simplified.

[0088] After the first sheet material S1 is cut in the cutting process, the protruding portion S1c of the pull-out direction rear end portion S1b of the pull-out side sheet portion S1a protruding from the first holding portion 28a is short, so that problems such as poor joining caused by the protruding portion S1c getting in the way in the subsequent joining process are avoided.

[0089] The second pressing portion 39 is formed of a plate-like body made of heat-resistant rubber, which prevents problems such as damage to the second pressing portion 39 due to heat. Moreover, the cushioning properties of the second pressing portion 39 allow the first bonding portion S1e and the second bonding portion S2e to be pressed evenly over the entire surfaces, thereby obtaining an appropriate bonding state and thereby suppressing the occurrence of wrinkles.

[0090] Since the second pressing portion 39 does not hold the second joint S2e, it is not necessary to form suction holes in the heat-resistant rubber plate-like body 39, and poor joining due to the presence of suction holes does not occur. Also, by not processing the heat-resistant rubber plate-like body 39 to provide suction holes, a decrease in durability can be prevented.

[0091] In the joining process, after the first joining portion S1e and the second joining portion S2e are thermally welded together and the first pressing portion 27 (heater) is separated from the first joining portion S1e, the second sheet base material S2 is released from its hold, thereby avoiding a problem in which the first joining portion S1e, which is attached to the first pressing portion 27 by heat, tries to move together with the first pressing portion 27. Therefore, the process after the thermal welding is carried out smoothly without being complicated.

[0092] The first holding portion 27 (heater) is divided into multiple portions in the width direction, and gaps 33 are formed between the multiple first holding portions 27. This eliminates the need to thermally weld the first joint portion S1e and the second joint portion S2e over the entire width direction, thereby reducing the amount of electrical energy required for thermal welding.

[0093] Since the front holding surface 34d of the front holding portion 34c and the rear holding surface 37a of the rear holding portion 37 are arranged at a right angle, the second pressing unit 24 can be made compact.

[0094] FIG. 15 shows a modified example of the first embodiment, illustrating a state in which the joining process is performed using the joining device 20. As shown in the figure, in this modified example, the front holding portion 34c and the rear holding portion 37, which respectively hold the pull-out direction front region S2f and the pull-out direction rear region S2g of the second sheet base material S2 by suction, are arranged on the same plane. In detail, a plurality of suction holes 42 are formed in the right part of the upper end wall portion 34a of the second box body 34, similar to the left part, and the front holding portion 34c, which is made of a rubber plate-like body similar to the rear holding portion 37 and has a plurality of suction holes 43 formed therein, is attached to the upper end surface of the formation area of ​​these suction holes 42. Therefore, the front holding portion 34c and the rear holding portion 37, which have the same structure, are arranged on both the left and right sides of the second pressing portion 39. In this case, the second pressing surface 39a, the front holding surface 34d, and the rear holding surface 37a are arranged on the same plane. In this modification, in order to reliably apply a pressing force in the thickness direction to the first joint S1e and the second joint S2e, the front holding surface 34d and the rear holding surface 37a may be positioned 5 to 20 mm below the second pressing surface 39a. Since the other configurations are the same as those of the first embodiment described above, the same reference numerals are used in Fig. 15 to denote components common to both, and the description thereof will be omitted.

[0095] 16 illustrates a second embodiment of the present invention. The main difference between this second embodiment and the first embodiment described above is that an extension member 44 extending downward is fixed to each of a pair of support frame members 18a arranged opposite to each other in the support frame 18, and the lower ends of these extension members 44 are connected by a roller member 45 extending in the width direction. Two extension members 44 are fixed to one support frame member 18a. In addition, in this second embodiment, the cutting process is not performed before the reversing process.

[0096] According to the configuration of the second embodiment, the support frame 18 and the holding frame 19 in the state shown in FIG. 16 are rotated 180° in the direction indicated by the arrow Z in the figure to perform the inversion process, so that the first sheet base material S1 drawn out from the first base material roll R1 is stretched over the two roller members 45 as shown in FIG. 17. After that, as shown in FIG. 18, the first pressing unit 23 and the second pressing unit 24 are brought close to each other to bring the first joint portion S1e of the first sheet base material S1 into contact with the second joint portion S2e of the second sheet base material S2. As a result, the first joint portion S1e and the second joint portion S2e are thermally welded. At this time, the pressing member 46 is pressed against one of the roller members 45 via the first sheet base material S1 to prevent slack from occurring at the cut portion of the first sheet base material S1. In this state, the cutting blade 47 is moved downward to cut the first sheet base material S1. Thereafter, the first pressing unit 23 and the second pressing unit 24 are moved away from the first sheet base material S1 and the second sheet base material S2, respectively. This makes it possible to pull out the second sheet base material S2 from the second base material roll R2 and supply it to the protective sheet production device 2.

[0097] Although an embodiment of the present invention has been described above, the embodiment of the present invention is not limited to this, and various modifications are possible without departing from the gist of the present invention.

[0098] For example, in the above embodiment, the sheet base materials S1, S2 are foamed resin sheets, but other sheets that can be thermally welded, such as non-foamable resin sheets, may be used.

[0099] In the above embodiment, the first sheet base material S1 and the second sheet base material S2 are thermally welded together using the heater 26, but the sheet base materials S1 and S2 may be joined together using an adhesive such as double-sided tape without using the heater 26. In this case, the adhesive may be applied or attached to the opposing surfaces of either or both of the first bonding portion S1e and the second bonding portion S2e before the joining step. Furthermore, when the heater 26 is not used in this manner, the sheet base materials S1 and S2 may be sheets that cannot be thermally welded together.

[0100] In the above embodiment (first embodiment), the second pressing portion 39 is a plate-like body made of heat-resistant rubber, and the rear holding portion 37 is a plate-like body made of rubber, but at least one of them may be made of resin, etc., and they may have other shapes such as a rod-like body instead of a plate-like body.

[0101] In the above embodiment, one holding portion for holding the second sheet material S2 is provided on each side of the second pressing portion 39, but two or more holding portions may be provided on one or both sides of the second pressing portion 39.

[0102] In the above embodiment, one holding portion for holding the first sheet material S1 is provided on one side of the first pressing portion 27, but one or more holding portions may be provided on both sides of the first pressing portion 39.

[0103] In the above embodiment (first embodiment), the front holding surface 34d is arranged at a right angle to the rear holding surface 37a, but it may be arranged at an incline.

[0104] In the above embodiment, the glass plates G and protective sheets S are loaded in a vertical position (inclined position) on the packing pallet P to form the glass plate package 12. However, these G and S may also be loaded in a horizontal position (laid flat). [Explanation of symbols]

[0105] 1. Glass sheet packaging manufacturing equipment 2. Protective sheet manufacturing equipment 12 Glass plate packaging 20 Bonding equipment 26 Heater (heating part) 27 First holding part 27a First pressing surface 28a Lower end wall 28a First holding part 28b First holding surface 34c Front retainer 34d Front retaining surface 37 Rear holding part 37a Rear retaining surface 39 Second holding part 39a Second holding surface G Glass plate P Packing pallet R1 First base material roll R2 Second base material roll S Protective Sheet S1 First sheet base material S1a Pull-out sheet part of the first base material S1b Rear end of the sheet part on the pull-out side in the pull-out direction S1e first joint S2e second joint S1g Rear area of ​​the first sheet material in the pull-out direction S2 Second sheet base material S2a Front end of second sheet base material in the pull-out direction S2f Front area of ​​the second sheet base material in the pull-out direction S2g Rear area of ​​second sheet base material in pulling direction

Claims

1. a first production step of producing a protective sheet to be overlaid on a glass plate by pulling out a first sheet base material from a first base material roll and cutting it; A second production step of producing a protective sheet to be overlaid on a glass plate by pulling out a second sheet base material from a second base material roll and cutting it after the first production step; a joining step of joining a first joint portion present in a part of the first sheet base material and a second joint portion present in a front end portion in a pulling direction of the second sheet base material, the joining step being performed after the first manufacturing step and before the second manufacturing step; a holding step of holding a front end portion of the second sheet material in the pulling direction after the first manufacturing step and before the joining step; A method for manufacturing a glass plate package comprising: A method for manufacturing a glass plate packaging body, characterized in that in the holding process, a region of the second sheet material that is forward of the second joint in the pulling-out direction is held by a front holding portion, and a region of the second sheet material that is rearward of the second joint in the pulling-out direction is held by a rear holding portion.

2. The method for manufacturing a glass plate package as described in claim 1, characterized in that in the joining process, a first pressing portion abutting the first joint portion and a second pressing portion arranged between the front holding portion and the rear holding portion and abutting the second joint portion are arranged opposite each other, and the first joint portion and the second joint portion are sandwiched and joined between the first pressing portion and the second pressing portion.

3. The method for manufacturing a glass sheet package according to claim 2 , further comprising a reversing step of switching positions of the first base material roll and the second base material roll after the holding step and before the joining step.

4. The method for manufacturing a glass plate package according to claim 3, further comprising a first holding portion arranged in parallel with the first pressing portion and holding a rear region of the first sheet material in the pulling-out direction relative to the first joint portion.

5. a cutting step of cutting the first sheet material and separating a pull-out side sheet portion from the first sheet material after the first manufacturing step and before the inverting step, The method for manufacturing a glass plate packaging body described in claim 4, characterized in that the first joint is present at the rear end of the pull-out side sheet portion in the pull-out direction during the cutting process, and the first holding portion holds the area of ​​the first sheet material rear of the first joint in the pull-out direction after cutting and separating the first sheet material and before the inversion process.

6. The first pressing portion has a heating portion, and the second pressing portion does not have a heating portion, The method for manufacturing a glass plate package according to claim 3 , wherein in the joining step, the first joining portion and the second joining portion are thermally fused by the heating portion.

7. The method for manufacturing a glass sheet package according to claim 6, wherein the second pressing portion is made of heat-resistant rubber.

8. The method for manufacturing a glass plate package according to claim 6 or 7, characterized in that, in the holding step, the second pressing portion does not hold the second joint portion.

9. The manufacturing method of a glass plate package according to claim 6 or 7, characterized in that in the joining process, after the thermal welding of the first joint portion and the second joint portion is completed and the first pressing portion is separated from the first joint portion, the holding of the second sheet material is released.

10. 8. The method for manufacturing a glass plate package according to claim 6, wherein the first sheet material and the second sheet material are strip-shaped foamed resin sheets.

11. The method for manufacturing a glass plate package according to claim 6 or 7, characterized in that the first pressing portion is divided into a plurality of portions in the width direction of the first sheet base material, and gaps are formed between the plurality of first pressing portions.

12. The method for manufacturing a glass plate package described in any one of claims 2 to 7, characterized in that the respective holding surfaces by which the front holding portion and the rear holding portion hold the second sheet base material are parallel to a pressing surface by which the second pressing portion presses the second joint portion.

13. a holding surface on which the rear holding portion holds the second sheet material is parallel to a pressing surface on which the second pressing portion presses the second joint portion, The manufacturing method of a glass plate package according to any one of claims 2 to 7, characterized in that a holding surface on which the front holding portion holds the second sheet material is inclined in a direction away from the first holding portion or is perpendicular to a holding surface on which the second holding portion holds the second joint portion.

14. The method for manufacturing a glass plate package according to any one of claims 1 to 7, characterized in that the first sheet material and the second sheet material each have a width dimension of 1100 mm or more and 3500 mm or less.

15. a protective sheet production device that produces a protective sheet to be overlaid on a glass plate by pulling out a first sheet base material from a first base material roll and cutting it, and that produces a protective sheet to be overlaid on a glass plate by pulling out a second sheet base material from a second base material roll and cutting it after finishing production of the protective sheet from the first base material roll; a joining device that joins a first joining portion present in a part of the first sheet base material and a second joining portion present in a front end portion in a pulling direction of the second sheet base material after finishing the production of the protective sheet from the first base material roll and before starting the production of the protective sheet from the second base material roll; a holding device that holds a front end portion of the second sheet base material in the unwinding direction after the production of the protective sheet from the first base material roll is completed and before the joining by the joining device is started; A manufacturing apparatus for a glass plate package comprising: The holding device is configured to hold a region of the second sheet material that is forward of the second joint in the pulling-out direction with a front holding portion, and to hold a region of the second sheet material that is rearward of the second joint in the pulling-out direction with a rear holding portion.

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