Resin sheet member and method for manufacturing the same

Abstract

The sheet member 1 has a pair of main surfaces 2a, 2b facing each other. The maximum interval between the pair of main surfaces, that is, the maximum thickness is 40 μm or more and 450 μm or less. The sheet member 1 has a region in which, when viewed from a direction normal to the pair of main surfaces 1a, 1b, a plurality of coherent pattern lines CL are arranged at intervals in a direction opposite to one edge portion 4 and another edge portion 5 opposite to the one edge portion 4, and a pair of coherent pattern lines CL adjacent to each other among the plurality of lines do not cross each other.

Description

TECHNICAL FIELD

[0001] The present application relates to a resin-made sheet member and a manufacturing method thereof. BACKGROUND

[0002] As a manufacturing method of a gasket for fuel cells, which is an example of a resin-made sheet member, it is known that an extrusion-molded thin resin film is formed into a desired shape by press working. Further, in Patent Literature 1, a gasket for fuel cells is manufactured by injection molding.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Laid-Open No. 2016-207445 SUMMARY

[0006] [PROBLEMS TO BE SOLVED BY THE INVENTION]

[0007] A gasket for fuel cells manufactured by press working of an extrusion-molded thin resin film has poor dimensional stability.

[0008] From the viewpoint of miniaturization of fuel cells, the thickness of a gasket for fuel cells is preferably thin. However, the minimum thickness of a gasket for fuel cells manufactured by injection molding disclosed in Patent Literature 1 is 0.2 mm, and there is room for further thinning.

[0009] An object of the present application is to provide a thin resin-made sheet member having good dimensional stability.

[0010] [MEANS FOR SOLVING THE PROBLEMS]

[0011] A first aspect of the present application provides a resin-made sheet member having a pair of main surfaces opposing each other, the maximum interval between the pair of main surfaces, that is, the maximum thickness, being 40 μm or more and 450 μm or less, the resin-made sheet member having a region in which, when viewed from a direction normal to the pair of main surfaces, a plurality of coherent pattern lines are arranged at intervals in a direction opposite to one edge portion and another edge portion opposing the one edge portion, and a pair of adjacent ones of the plurality of coherent pattern lines do not cross each other.

[0012] Specifically, the region is 50% or more of the total area of the pair of main surfaces.

[0013] The reason why the resin sheet member has the region in which the coherent pattern lines appear as described above is that the resin sheet member is not manufactured by the punching processing of the thin resin film after the extrusion molding, but is manufactured by the injection molding described later, that is, the injection molding involved in the manufacturing method of the second aspect of the present application. The resin sheet member of the present application manufactured by the injection molding involved has excellent dimensional stability compared to the resin sheet member manufactured from the thin resin film after the extrusion molding.

[0014] The maximum thickness of the resin sheet member of the present application is 40 μm or more and 450 μm or less, that is, further thinner than the resin sheet member manufactured by the conventional injection molding. Therefore, the resin sheet member of the present application can contribute to the downsizing of the fuel cell when used as a gasket for the fuel cell.

[0015] The second aspect of the present application provides a manufacturing method of a resin sheet member, in which a molding die is prepared, the molding die defines a cavity, the cavity has a product portion in which the resin sheet member is molded, a gate portion which communicates with an injection unit of a molding machine, and a shoulder portion which communicates with the gate portion and communicates with one edge portion of the product portion, the thickness of the shoulder portion is greater than the thickness of the product portion, and the molten resin is supplied from the injection unit of the molding machine to the gate portion, the molten resin flows into the product portion from the one edge portion after filling the shoulder portion, and flows toward another edge portion of the product portion which is opposite to the one edge portion.

[0016] The molten resin flows into the product portion from the one edge portion of the product portion after filling the shoulder portion, and flows toward another edge portion of the product portion which is opposite to the one edge portion. As a result, the resin flow in one direction from the one edge portion toward the another edge portion is generated in the product portion, and the orientation of the resin is uniform in the flow direction. Thus, by making the orientation of the resin uniform, the resin sheet member having excellent dimensional stability is obtained compared to the resin sheet member manufactured from the thin resin film after the extrusion molding.

[0017] The resin sheet member obtained by the manufacturing method of the second aspect of the present application has the orientation of the resin uniform in one direction as described above. Therefore, the resin sheet member has the regions in which a plurality of coherent pattern lines appear at intervals in the direction of the orientation of the resin, that is, the direction opposite to the one edge portion of the product portion and the another edge portion of the product portion which is opposite to the one edge portion (the direction opposite to the one edge portion of the resin sheet member and the another edge portion of the resin sheet member which is opposite to the one edge portion), and the pair of the coherent pattern lines adjacent to each other among the coherent pattern lines do not cross each other.

[0018] The thickness of the shoulder portion can be set to be 1.3 times or more and 24 times or less of the thickness of the product portion.

[0019] The average thickness of the shoulder portion can be set to 300 μm or more and 1200 μm or less.

[0020] Also, the shoulder portion can communicate with the entire area of the inner peripheral portion of the product portion, and the molten resin can flow from the inner peripheral portion to the product portion and toward the outer peripheral portion of the product portion after being filled into the shoulder portion.

[0021] Also, the shoulder portion can communicate with the entire area of the outer peripheral portion of the product portion, and the molten resin can flow from the outer peripheral portion to the product portion and toward the inner peripheral portion of the product portion after being filled into the shoulder portion.

[0022] Also, the outer peripheral portion of the product portion can be composed of a plurality of peripheral portions, the shoulder portion can communicate with one peripheral portion that constitutes a part of the outer peripheral portion of the product portion, and the molten resin can flow from the one peripheral portion that constitutes a part of the outer peripheral portion toward another peripheral portion that opposes the one peripheral portion that constitutes a part of the outer peripheral portion after being filled into the shoulder portion.

[0023] The resin can be a thermoplastic resin having a melt mass flow rate of 10 g / 10 min or more and 300 g / 10 min or less and a heat of fusion of 0 mj / mg or more and 150 mj / mg or less.

[0024] Inventive Effects

[0025] According to the present application, a thinned resin sheet member having a maximum thickness of 40 μm or more and 450 μm or less and good dimensional stability is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic perspective view of a sheet member (gasket for fuel cell) of the first embodiment of the present application.

[0027] Figure 2 is a photograph of a part of Figure 1 .

[0028] Figure 3 is a schematic plan view of a molding die for manufacturing the sheet member of the first embodiment.

[0029] Figure 4 is a sectional view along the IV-IV line of Figure 3 .

[0030] Figure 5 is a schematic plan view of a lower die for explaining orientation of resin at the time of injection molding.

[0031] Figure 6 is a schematic plan view of the sheet member at the time of extraction from the molding die.

[0032] Figure 7 is a sectional view along the line VII-VII of Figure 6 .

[0033] Figure 8 is a sectional view similar to Figure 4 of another example of the molding die usable for manufacturing the sheet member of the first embodiment.

[0034] Figure 9 is a schematic plan view similar to Figure 5 of another molding die (lower die) usable for manufacturing the sheet member of the first embodiment.

[0035] Figure 10 is a schematic plan view of the sheet member at the time of extraction from the molding die of Figure 9 .

[0036] Figure 11 is a sectional view along the line XI-XI of Figure 10 .

[0037] Figure 12 is a schematic plan view similar to Figure 5 of another molding die (lower die) usable for manufacturing the sheet member of the first embodiment.

[0038] Figure 13 is a schematic plan view of the sheet member at the time of extraction from the molding die of Figure 12 .

[0039] Figure 14 is a sectional view similar to Figure 4 of another example of the molding die usable for manufacturing the sheet member of the first embodiment.

[0040] Figure 15 is a schematic plan view of the sheet member at the time of extraction from the molding die of Figure 14 .

[0041] Figure 16 is a sectional view along the line XVI-XVI of Figure 14 .

[0042] Figure 17 is a sectional view similar to Figure 14 showing an alternative of the shoulder portion.

[0043] Figure 18 is a sectional view similar to Figure 14 showing an alternative of the shoulder portion.

[0044] Figure 19 is a schematic perspective view of a sheet member of the second embodiment of the present application.

[0045] Figure 20 is a schematic plan view of a molding die (lower die) usable for manufacturing the sheet member of the second embodiment, similar to Figure 5 .

[0046] Figure 21 is a schematic plan view of the sheet member when taken out of the molding die of Figure 20 .

[0047] Figure 22 is a schematic plan view of another molding die (lower die) usable for manufacturing the sheet member of the second embodiment, similar to Figure 5 .

[0048] Figure 23 is a schematic plan view of the sheet member when taken out of the molding die of Figure 22 .

[0049] Figure 24 is a schematic perspective view of a sheet member of the third embodiment of the present application.

[0050] Figure 25 is a schematic plan view of a molding die for manufacturing the sheet member of the third embodiment.

[0051] Figure 26 is a sectional view along lines XXVI-XXVI of Figure 25 .

[0052] Figure 27 is a schematic plan view of a molding die (lower die) usable for manufacturing the sheet member of the third embodiment, similar to Figure 5 .

[0053] Figure 28 is a schematic plan view of the sheet member when taken out of the molding die of Figure 27 .

[0054] Figure 29 is a sectional view along lines XXIX-XXIX of Figure 28 .

[0055] Figure 30 is a schematic plan view of another molding die for manufacturing the sheet member of the third embodiment.

[0056] Figure 31 is a sectional view along lines XXXI-XXXI of Figure 30 .

[0057] Figure 32 is a schematic plan view of the sheet member when taken out of the molding die of Figure 31is a schematic plan view of the sheet member at the time of extraction from the molding die of

[0058] Figure 33 is a sectional view along the line XXXIII-XXXIII of Figure 32

[0059] Figure 34 is a schematic perspective view of the sheet member of the fourth embodiment of the present application.

[0060] Figure 35 is a schematic plan view of the molding die for manufacturing the sheet member of the fourth embodiment.

[0061] Figure 36 is a sectional view along the line XXXVI-XXXVI of Figure 35

[0062] Figure 37 is a schematic plan view of the molding die (lower die) that can be used for manufacturing the sheet member of the fourth embodiment, similar to Figure 5

[0063] Figure 38 is a schematic plan view of the sheet member at the time of extraction from the molding die of Figure 37

[0064] Figure 39 is a sectional view along the line XXXIX-XXXIX of Figure 38

[0065] Figure 40 is a schematic plan view of the sheet member of the modification of the fourth embodiment.

[0066] Figure 41 is a schematic plan view of the sheet member of another modification of the fourth embodiment.

[0067] Figure 42 is a schematic perspective view of the sheet member of the fifth embodiment of the present application.

[0068] Figure 43 is a schematic plan view of the molding die (lower die) that can be used for manufacturing the sheet member of the fifth embodiment, similar to Figure 5

[0069] Figure 44 is a schematic plan view of the sheet member at the time of extraction from the molding die of Figure 43

[0070] Figure 45 is a schematic perspective view of the sheet member of the modification of the fifth embodiment.

[0071] Figure 46 ​​​​​​​is a schematic perspective view of a sheet member of the sixth embodiment of the present application.

[0072] Figure 47 is a schematic plan view of a molding die for manufacturing the sheet member of the sixth embodiment.

[0073] Figure 48 is a sectional view along Figure 47 line XXXXVIII-XXXXVIII.

[0074] Figure 49 is a sectional view along Figure 48 line L-L.

[0075] Figure 50 is a schematic plan view of a sheet member at the time of extraction from the molding die of Figure 49

[0076] Figure 51 is a schematic perspective view of a sheet member of the seventh embodiment of the present application.

[0077] Figure 52 is a schematic plan view of a molding die for manufacturing the sheet member of the seventh embodiment.

[0078] Figure 53 is a sectional view along Figure 42 line LIII-LIII.

[0079] Figure 54 is a schematic plan view of a molding die (lower die) usable for manufacturing the sheet member of the seventh embodiment, similar to Figure 5

[0080] Figure 55 is a schematic plan view of a sheet member at the time of extraction from the molding die of Figure 49

[0081] Figure 56 is a schematic perspective view of a sheet member of the eighth embodiment of the present application.

[0082] Figure 57 is a schematic plan view of a molding die for manufacturing the sheet member of the eighth embodiment.

[0083] Figure 58 is a sectional view along Figure 57 line LVII-LVII.

[0084] Figure 59 is a schematic plan view of a molding die (lower die) usable for manufacturing the sheet member of the eighth embodiment, similar to Figure 5

[0085] ​​​​Figure 60 is a schematic plan view of a sheet member at the time of taking out from a mold for molding. Figure 59

[0086] Figure 61 is a schematic plan view of a gasket used in the evaluation test.

[0087] Figure 62 is a schematic plan view of a comparative example used in the evaluation test. DETAILED DESCRIPTION

[0088] Hereinafter, an embodiment of the present application will be described with reference to the drawings.

[0089] (First Embodiment)

[0090] Figure 1 A resin-made sheet member 1 (hereinafter, simply referred to as sheet member 1) of a first embodiment of the present application is shown. The sheet member 1 of the present embodiment is a gasket for a fuel cell.

[0091] As described later, the sheet member 1 is manufactured by injection molding of a thermoplastic resin.

[0092] The sheet member 1 has two faces, i.e., a pair of main faces la, lb, each of which has a sufficiently large area compared with the other face, which oppose each other. In the present embodiment, the interval between the main faces la, lb, i.e., the thickness THm of the sheet member 1 is constant or uniform. The sheet member 1 (gasket) is thinner than a gasket manufactured by a conventional injection molding. That is, the thickness THm of the sheet member 1 is set to 40 μm or more and 450 μm or less. The thickness THm of the sheet member 1 is preferably set to 50 μm or more and 350 μm or less, and more preferably set to 100 μm or more and less than 200 μm. The thickness THm of the sheet member 1 does not necessarily have to be uniform. That is, different portions of the sheet member 1 can have different thicknesses THm. In the case where the thickness THm of the sheet member 1 is not uniform, the maximum thickness, i.e., the maximum value of the thickness THm (the maximum interval between the main faces la, lb) is set to 40 μm or more and 450 μm or less, preferably 50 μm or more and 350 μm or less, and more preferably 100 μm or more and less than 200 μm.

[0093] The overall shape of the sheet member 1 of the present embodiment is a flat rectangular frame shape, and has a pair of long edge portions 2A, 2B extending in the longitudinal direction of the sheet member 1 and a pair of short edge portions 3A, 3B extending in the lateral direction of the sheet member 1 and connecting the end portions of the long edge portions 2A, 2B, respectively. The sheet member 1 of the present embodiment has an inner peripheral portion 4 and an outer peripheral portion 5 each of which is a rectangular shape when viewed from the direction opposite to the main faces 2a, 2b.

[0094] ​Next, a manufacturing method (injection molding method) of the sheet member 1 of the present embodiment will be described.

[0095] Referring to Figures 3 to 5 In the present embodiment, a molding die 100 for injection molding the sheet member 1 is provided with an upper die 101 and a lower die 102. In the present embodiment, a cavity 103 defined by the upper die 101 and the lower die 102 has one product portion 104, a plurality of (10) gate portions 105, and one shoulder portion 106.

[0096] The product portion 104 is a portion for molding the sheet member 1, and has substantially the same size and shape as the sheet member 1. In particular, the product portion 104 has an inner peripheral portion 104a and an outer peripheral portion 104b corresponding to the inner peripheral portion 4 and the outer peripheral portion 5 of the sheet member 1, respectively. The inner peripheral portion 104a and the outer peripheral portion 104b are each rectangular in plan view. Further, the thickness THp of the product portion 104 is substantially the same as the thickness THm of the sheet member 1. That is, the maximum value of the thickness THp of the product portion 104 is set to 40 μm or more and 450 μm or less, preferably 50 μm or more and 350 μm or less, and more preferably 100 μm or more and less than 200 μm.

[0097] In the present embodiment, the gate portions 105 are arranged on the inner side of the product portion 104 in plan view.

[0098] Each of the gate portions 105 is in fluid communication with an injection unit of a molding machine (not shown) via a spool mechanism 107 provided to the upper die 101. The gate portions 105 are supplied with molten thermoplastic resin from the injection unit of the molding machine. The spool mechanism 107 supplies the thermoplastic resin to the gate portions 105 only in a state where the upper die 101 and the lower die 102 are clamped. Therefore, a trace corresponding to the shape of an outlet hole of the spool mechanism 107 remains in a second non-product portion 109 described later.

[0099] Each of the gate portions 105 is in fluid communication with the shoulder portion 106.

[0100] In the present embodiment, the shoulder portion 106 is arranged on the inner side of the product portion 104 in plan view. The shoulder portion 106 is interposed between the gate portions 105 and the product portion 104. The shoulder portion 106 is rectangular in plan view, and communicates with the entire area of the inner peripheral portion of the product portion 104.

[0101] The thickness THz of the shoulder portion 106 is greater than the thickness THp of the product portion 104. For example, the thickness THz of the shoulder portion 106 is set to be 1.3 times or more and 24 times or less of the thickness THp of the product portion 104, and preferably 2.5 times or more and 10 times or less. Further, the thickness THz of the shoulder portion 106 is set to be equal to or less than the thickness THgr of the gate portion 105. For example, the thickness THz of the shoulder portion 106 is set to be 0.12 times or more and 1.0 times or less of the thickness THgr of the gate portion 105. The thickness THp of the product portion 104, the thickness THz of the shoulder portion 106, and the thickness THgr of the gate portion 105 (average thickness) are set to satisfy the following relation of Expression (1).

[0102] THp < THz < THgr (1)

[0103] The thickness THz of the shoulder portion 106 is set to be 300 μm or more and 1200 μm or less, and preferably 500 μm or more and 1000 μm or less, in terms of average thickness, on the basis of satisfying the above conditions. In the present embodiment, the thickness THz of the shoulder portion 106 is constant, and the average thickness is set to be 500 μm. Further, in the present embodiment, the thickness THz of the shoulder portion 106 is 3 times the thickness THp of the product portion 104.

[0104] The molten thermoplastic resin supplied to the gate portion 105 from the injection unit of the molding machine flows into the shoulder portion 106, but until the shoulder portion 106 is filled with the thermoplastic resin, that is, until the entire volume of the shoulder portion 106 is occupied by the thermoplastic resin, substantially no thermoplastic resin flows into the product portion 104. In a state where the entire volume of the shoulder portion 106 is occupied by the thermoplastic resin, if the molten thermoplastic resin is further supplied to the shoulder portion 106 from the gate portion 105, as shown by the dotted arrows in FIG. 6, the molten thermoplastic resin simultaneously flows from the shoulder portion 106 to the product portion 104. More specifically, as shown by the dotted arrows in FIG. 6, the molten thermoplastic resin flows in one direction from the inner peripheral portion 104a toward the outer peripheral portion 104b of the product portion 104. Figure 5 Figure 5

[0105] ​​The shoulder portion 106 functions as a portion for pre-storing molten thermoplastic resin in order to cause uniform resin flow in one direction into the article portion 104. The thermoplastic resin needs to flow into the entire shoulder portion 106 prior to flowing into the article portion 104. As described above, by setting the thickness THz of the shoulder portion 106 to be thicker than the thickness THp of the article portion 104, the thermoplastic resin flows in this manner. When the flow of the thermoplastic resin into the shoulder portion 106 is completed, the internal pressure of the molding die 100 rises, and the thermoplastic resin can flow from the shoulder portion 106 into the article portion 104, which is thinner. In order to achieve such a uniform flow state of the molten resin, it is preferable to maintain the temperature of the molding die 100 at 20°C or higher and 80°C or lower, and more preferably at 40°C or higher and 80°C or lower. In the present embodiment, the temperature of the molding die 100 is maintained at 40°C or higher and 50°C or lower. In order to maintain the appropriate temperature, a cooling hole can be provided in the molding die 100 (the upper die 101, the lower die 102).

[0106] On the basis of achieving the above-described flow state, the thermoplastic resin has a melt mass flow rate (measurement conditions: JIS K 7210 230°C, 2.16 kg) of 10 g / 10 min or more and 300 g / 10 min or less, a heat of fusion of 0 mj / mg or more and 150 mj / mg or less, and preferably 50 mj / mg or more and 110 mj / mg or less.

[0107] Table 1 below shows examples of thermoplastic resins that can be used.

[0108] [Table 1]

[0109]

[0110] The orientation of the thermoplastic resin is uniform in the flow direction of the thermoplastic resin (the arrow of the dotted line) as described above. In this way, by making the orientation of the thermoplastic resin uniform, a sheet member 1 having excellent dimensional stability is obtained compared to a resin sheet member made of a thin resin film after extrusion molding. Figure 5

[0111] Figure 6 Figure 7 ​​The sheet member 1 is shown as removed from the molding die 100 after the injection molding is completed. A rectangular frame-shaped first non-product portion 108 corresponding to the shoulder portion 106 is formed on the inner side of the sheet member 1, and a second non-product portion 109 corresponding to the gate portion 105 is formed on the further inner side of the first non-product portion 108. The first non-product portion 108 has a thickness THn1 corresponding to the thickness THz of the shoulder portion 106, and the second non-product portion 109 has a thickness THn2 corresponding to the thickness THgr of the gate portion 105. The manufacture of the sheet member 1 is completed by removing the first non-product portion 108 and the second non-product portion 109 by cutting.

[0112] As described above, within the product portion 104 of the cavity 103, the orientation of the thermoplastic resin is uniform in the flow direction of the thermoplastic resin (the arrow of the dotted line), and thus regular coherent pattern lines appear on the sheet member 1. The coherent pattern lines can be observed by irradiating the sheet member 1 with illumination light. Specifically, in the sheet member 1, a plurality of coherent pattern lines CL conceptually shown by the double-dot chain line appear in the product portion 104 of the cavity 103 in the direction of the flow of the thermoplastic resin (the orientation direction of the thermoplastic resin) indicated by the arrow of the dotted line. Figure 5 Figure 5 Figure 1 Figure 2 Figure 1 The photograph is a part of the

[0113] The reason why the sheet member 1 of the present embodiment has the region in which the regular coherent pattern lines CL appear as described above is that the sheet member 1 is not manufactured by the punching processing of the thin resin film after the extrusion molding, but is manufactured by the injection molding as described above. That is, the appearance of the regular coherent pattern lines CL as described above can be said to indirectly prove that the sheet member 1 is manufactured by the injection molding as described above, and thus the orientation of the thermoplastic resin is uniform, and has excellent dimensional stability compared to the resin-made sheet member made of the thin resin film after the extrusion molding.

[0114] ​​​​As described above, since the sheet member 1 (gasket) is manufactured by injection molding in a manner that the orientation direction of the thermoplastic resin is uniform, it has excellent dimensional stability compared to a gasket made of a thin resin film after extrusion molding. Further, the thickness THm of the sheet member 1 (gasket) is 40 μm or more and 450 μm or less, preferably 50 μm or more and 350 μm or less, more preferably 100 μm or more and less than 200 μm, and is further thinned compared to a gasket manufactured by the conventional injection molding. Therefore, by using the sheet member 1 of the present embodiment for a gasket, miniaturization of a fuel cell can be achieved.

[0115] As described above, in the sheet member 1 of the present embodiment, the orientation direction of the thermoplastic resin is uniform, thereby having excellent dimensional stability. However, in the entire region of the sheet member 1, it is not necessarily required that the orientation direction of the thermoplastic resin is uniform. In other words, the entire main surfaces la, lb need not be a region in which a plurality of coherent pattern lines CL are arranged at intervals in the direction in which the inner peripheral portion 4 opposes the outer peripheral portion 5 as described above, and adjacent coherent pattern lines CL do not cross. If such a region is 50% or more, preferably 70% or more, of the total area of the main surfaces la, lb, improvement in dimensional stability due to the uniform orientation direction of the thermoplastic resin can be achieved.

[0116] Figures 8 to 18 A modification of the first embodiment is shown. These embodiments can also be applied to the second to eighth embodiments described later.

[0117] In Figure 8 the modification, the bobbin bush 110 in which the bobbin 110a is formed is attached to the upper mold 101. That is, the molding mold 100 of this modification is a so-called direct bobbin mold. In the case of the present modification, an elongated conical trace corresponding to the bobbin 110a remains in the second non-product portion 109.

[0118] In Figure 9 the modification, the cavity 103 defined by the molding mold 100 is provided with a shoulder portion 106 arranged outside the product portion 104, and a plurality of gate runner portions 105 arranged outside the shoulder portion 106. At the time of injection molding, as shown by the dotted arrows in Figure 9 , the molten thermoplastic resin flows in one direction from the outer peripheral portion 104a toward the inner peripheral portion 104b of the product portion 104. As shown in Figure 10 and Figure 11 , in the sheet member 1 taken out of the molding mold 100 after the completion of injection molding, a first non-product portion 108 corresponding to the shoulder portion 106 is formed outside the product portion 104, and a second non-product portion 109 corresponding to the gate runner portion 105 is formed outside thereof.

[0119] In Figure 12 and Figure 13 In the modification shown in FIG. 10, the gate 105 has a portion opposite to the bobbin mechanism 107 or the bobbin bush 110 on the inner side of the shoulder portion 106, that is, a gate portion 105a into which the molten thermoplastic resin flows. Further, the gate 105 in the present embodiment has a plurality of runners 105b branched from the gate portion 105a and connected to the shoulder portion 106, respectively.

[0120] In Figure 14 In the modification shown in FIG. 11, an overflow portion 112 is provided in the cavity 103 so as to surround the entire area on the outer side of the product portion 106. Thus, as shown in FIG. 12, a third non-product portion 113 is formed so as to surround the entire area on the outer side of the product portion 104 in a state taken out of the molding die 100 after the injection molding. The third non-product portion 113 is removed from the sheet member 1 by cutting, like the first non-product portion 108 and the second non-product portion 109. In the present embodiment, the thickness THo of the overflow portion 112 is set to be the same as the thickness THp of the product portion 106. By providing the overflow portion 112, it is possible to prevent a portion where the thermoplastic resin is not filled locally from being generated in the product portion 106. Figure 15 and Figure 16 In the modification shown in FIG. 11, an overflow portion 112 is provided in the cavity 103 so as to surround the entire area on the outer side of the product portion 106. Thus, as shown in FIG. 12, a third non-product portion 113 is formed so as to surround the entire area on the outer side of the product portion 104 in a state taken out of the molding die 100 after the injection molding. The third non-product portion 113 is removed from the sheet member 1 by cutting, like the first non-product portion 108 and the second non-product portion 109. In the present embodiment, the thickness THo of the overflow portion 112 is set to be the same as the thickness THp of the product portion 106. By providing the overflow portion 112, it is possible to prevent a portion where the thermoplastic resin is not filled locally from being generated in the product portion 106.

[0121] In the modification shown in FIG. 13, the thickness THz is constant in the portion of the shoulder portion 106 on the side of the gate 105, but the thickness THz decreases toward the product portion 104 in the portion of the shoulder portion 106 connected to the product portion 104. In the modification shown in FIG. 14, the thickness THz of the shoulder portion 106 decreases from the portion connected to the gate 105 toward the portion connected to the product portion 104. Figure 17 Figure 18 In the modification shown in FIG. 13, the thickness THz is constant in the portion of the shoulder portion 106 on the side of the gate 105, but the thickness THz decreases toward the product portion 104 in the portion of the shoulder portion 106 connected to the product portion 104. In the modification shown in FIG. 14, the thickness THz of the shoulder portion 106 decreases from the portion connected to the gate 105 toward the portion connected to the product portion 104.

[0122] Hereinafter, the second to eighth embodiments of the present application will be described. As for these embodiments, matters not particularly mentioned are the same as those of the first embodiment. Further, in the drawings of these embodiments, the same reference numerals are attached to elements common or similar to those of the first embodiment.

[0123] (Second Embodiment)

[0124] Figure 19 A sheet member 1 of the second embodiment of the present application is shown.

[0125] The overall shape of the sheet member 1 of the present embodiment is a hexagonal shape, and has six edge portions 11A, 11B, 11C, 11D, 11E, and 11F each in a straight line shape.

[0126] Referring to Figure 20 ​In the molding die 100 of the present embodiment, a shoulder portion 106 of a hexagonal shape is also provided on the outside of the article portion 104 of a hexagonal shape in plan view. Further, two gate portions 105 are provided on the outside of portions of the shoulder portion 106 corresponding to the side portions 11A to 11F, respectively. After the molten thermoplastic resin supplied from the injection molding unit of the molding machine to the gate portions 105 is filled in the shoulder portion 106, as indicated by the dotted arrows in FIG. 1, the molten thermoplastic resin simultaneously flows into the article portion 104 from the shoulder portion 106. More specifically, as indicated by the dotted arrows in FIG. 1, the molten thermoplastic resin flows in one direction from the outer peripheral portion 104b toward the inner peripheral portion 104a of the article portion 104. Figure 20 Figure 20

[0127] Figure 21 The sheet member 1 taken out from the molding die 100 after the injection molding is shown. A first non-article portion 108 of a hexagonal shape corresponding to the shoulder portion 106 is formed on the outside of the sheet member 1, and a second non-article portion 109 corresponding to the gate portions 105 is formed on the outside of the first non-article portion 108.

[0128] In the article portion 104 of the cavity 103, the orientation of the thermoplastic resin is uniform in the flow direction of the thermoplastic resin (dotted arrows in FIG. 1), and thus a plurality of coherent pattern lines CL conceptually indicated by the double-dot chain line in FIG. 1 appear on the sheet member 1. More specifically, in each of the side portions 11A to 11F, a plurality of coherent pattern lines CL arranged at intervals in the direction in which the inner peripheral portion 4 opposes the outer peripheral portion 5 appear. Further, a pair of the coherent pattern lines CL adjacent to each other do not cross. Figure 20 Figure 19

[0129] Figure 22 Figure 23 A modification of the second embodiment is shown. In the modification, the cavity 103 defined by the molding die 100 has the shoulder portion 106 arranged on the inside of the article portion 104, and a plurality of gate portions 105 arranged on the inside of the shoulder portion 106. At the time of injection molding, as indicated by the dotted arrows in FIG. 2, the molten thermoplastic resin flows in one direction from the inner peripheral portion 104a toward the outer peripheral portion 104b of the article portion 104. As shown in FIG. 2, in the sheet member 1 taken out from the molding die 100 after the injection molding, a first non-article portion 108 corresponding to the shoulder portion 106 is formed on the inside of the article portion 104, and a second non-article portion 109 corresponding to the gate portions 105 is formed on the inside of the first non-article portion 108. Figure 22 Figure 23

[0130] (Third Embodiment)

[0131] ​​​​​​​Figure 24 A sheet member 1 of a third embodiment of the present application is shown.

[0132] The sheet member 1 of the present embodiment is circular ring-shaped. In the present embodiment, the sheet member 1 is substantially circular in plan view, but can be elliptical in plan view.

[0133] Reference Figures 25 to 27 In the molding die 100 of the present embodiment, a shoulder portion 106 that is circular ring-shaped is also provided on the inner side of the article portion 104 that is circular ring-shaped in plan view. Further, a single gate runner portion 105 that is cylindrical is provided on the inner side of the shoulder portion 106. The entire area of the inner side of the shoulder portion 106 communicates with the gate runner portion 105. The molten thermoplastic resin supplied to the gate runner portion 105 from the injection molding unit of the molding machine flows into the article portion 104 from the shoulder portion 106 at the same time after filling the shoulder portion 106, as shown by the dotted arrows in Figure 27

[0134] Figure 28 and Figure 29 A sheet member 1 removed from the molding die 100 after completion of injection molding is shown. A first non-article portion 108 that is circular ring-shaped corresponding to the shoulder portion 106 is formed on the outer side of the sheet member 1, and a second non-article portion 109 that is cylindrical corresponding to the gate runner portion 105 is formed on the outer side of the first non-article portion 108. The first non-article portion 108 and the second non-article portion 109 are removed, thereby completing the manufacture of the sheet member 1. However, it is also possible to use the first non-article portion 108 and the second non-article portion 109 as they are without removing them from the sheet member 1. In the case where the first non-article portion 108 and the second non-article portion 109 are not removed from the sheet member 1, these portions become thick wall portions having a thickness THn1, THn2 thicker than the interval (thickness THm) between the main faces 1a, 1b. Such thick wall portions are 50% or less of the total area of the sheet member 1, which is preferable in terms of ensuring dimensional stability by aligning the orientation of the thermoplastic resin in the portions other than the thick wall portions of the sheet member 1. It is possible to use the sheet member 1 from which the first non-article portion 108 and the second non-article portion 109 are not removed as a finished product, which is the same for the modified example of the present embodiment described later and other embodiments and modified examples thereof. The second non-article portion 109 is removed from the sheet member 1, but it is also possible to use the first non-article portion 108 as it is without removing it from the sheet member 1 as a finished product.

[0135] In the article portion 104 of the cavity 103, the orientation of the thermoplastic resin is aligned in the flow direction of the thermoplastic resin (dotted arrows in Figure 27 , whereby a thick wall portion 1a1 having a thickness THn1 thicker than the interval (thickness THm) between the main faces 1a, 1b appears on the sheet member 1. Figure 24 ​A plurality of coherent pattern lines CL are conceptually shown by double-dot chain lines. Specifically, a plurality of coherent pattern lines CL are arranged at intervals in a direction in which the inner peripheral portion 4 opposes the outer peripheral portion 5. Further, a pair of the coherent pattern lines CL adjacent to each other do not cross.

[0136] Figures 30 to 33 A modification of the present embodiment is shown.

[0137] In Figure 30 and Figure 31 , the gate portion 105 protrudes more upward in the drawing than the product portion 104 and the shoulder portion 106. Further, the lower mold 102 has a cylindrical portion 102a protruding upward in the drawing in a portion that defines the gate portion 105. Therefore, as shown in Figure 32 and Figure 33 , the second non-product portion 109 in this modification has a shape that protrudes upward in the drawing from the sheet member 1 and the first non-product portion 108 and has a cylindrical recess formed at a lower end.

[0138] (Fourth Embodiment)

[0139] Figure 34 A sheet member 1 of a fourth embodiment of the present application is shown.

[0140] The sheet member 1 of the present embodiment is flat and rectangular. The outer peripheral portion 5 of the sheet member 1 has a pair of straight edge portions 5a, 5b opposing each other, and a pair of straight edge portions 5c, 5d opposing each other and connecting end portions of the straight edge portions 5a, 5b.

[0141] Referring to Figures 35 to 37 , in the molding die 100 in the present embodiment, the shoulder portion 106 of a certain width is provided in a portion of the product portion 104 corresponding to the straight edge portion 5a. A single gate portion 105 is provided on a side of the shoulder portion 106 opposite the product portion 104. Molten thermoplastic resin supplied from a molding machine injection unit to the gate portion 105 flows into the product portion 104 simultaneously with the shoulder portion 106 after filling the shoulder portion 106, as shown by the dotted arrow in Figure 37 . More specifically, as shown by the dotted arrow in Figure 37 , the molten thermoplastic resin flows in one direction from a portion of the outer peripheral portion 104b of the product portion 104 corresponding to the straight edge portion 5a toward a portion corresponding to the straight edge portion 5b.

[0142] Figure 38 and Figure 39The sheet member 1 is shown after injection molding is completed and removed from the molding mold 100. A first non-product portion 108, which is an elongated rectangle corresponding to the shoulder portion 106, is formed on the straight edge portion 5a side of the sheet member 1. A second non-product portion 109, which corresponds to the gate / sprue portion 105, is formed on the side of the first non-product portion 108 opposite to the sheet member 1.

[0143] Within the product section 104 of the cavity 103, the orientation of the thermoplastic resin is in the flow direction of the thermoplastic resin ( Figure 37 The dashed arrow (aligned with the line) appears on piece 1, thus appearing on piece 1. Figure 34 Multiple coherent pattern lines CL are conceptually represented by double-dotted lines. Specifically, multiple coherent pattern lines CL appear at intervals in the direction opposite to the straight edge 5a and the straight edge 5b. Furthermore, adjacent pairs of these coherent pattern lines CL do not intersect.

[0144] Figure 40 and Figure 41 A variation of the fourth embodiment is shown.

[0145] exist Figure 40 The modified example shown has multiple through holes 1c formed on the sheet member 1.

[0146] exist Figure 41 The modified example shown has multiple cuts 1d formed on the sheet member 1, extending from the straight edge 5b to the straight edge 5a and terminating within the sheet member 1.

[0147] You can also Figure 40 Such through holes, Figure 41 Such cuts are made in sheet member 1 in other embodiments besides the fourth embodiment.

[0148] (Fifth implementation method)

[0149] Figure 42 The sheet component 1 of the fifth embodiment of the present invention is shown.

[0150] The sheet component 1 in this embodiment and the fourth embodiment ( Figure 34 Like the sheet member 1 in the fourth embodiment, it is a flat rectangle, but it is longer and thinner. That is, the straight edge portions 5a and 5b, which are part of the outer peripheral portion 5, are also sufficiently longer than the straight edge portions 5c and 5d, which are part of the outer peripheral portion 5.

[0151] Reference Figure 43In the molding die 100 of the present embodiment, an elongated rectangular shoulder portion 106 of a certain width is provided in the portion of the product portion 104 corresponding to the straight edge portion 5a. A plurality of gate portions 105 are provided on the side of the shoulder portion 106 opposite the product portion 104. The molten thermoplastic resin supplied from the injection molding unit of the molding machine to the gate portions 105 flows in one direction from the portion of the product portion 104 corresponding to the straight edge portion 5c toward the portion corresponding to the straight edge portion 5b after filling the shoulder portion 106.

[0152] Figure 44 The sheet member 1 taken out from the molding die 100 after the completion of injection molding is shown. An elongated rectangular first non-product portion 108 corresponding to the shoulder portion 106 is formed on the side of the straight edge portion 5a of the sheet member 1, and a second non-product portion 109 corresponding to the gate portions 105 is formed on the side of the first non-product portion 108 opposite the sheet member 1.

[0153] Figure 45 The sheet member 1 of the modified example of the present embodiment is shown. A semicircular cutout le and a rectangular cutout If are formed in the straight edge portion 5c of the sheet member 1.

[0154] (Sixth Embodiment)

[0155] Figure 46 The sheet member 1 of the sixth embodiment of the present application is shown.

[0156] The sheet member 1 of the present embodiment is semicircular. The outer peripheral portion 5 of the sheet member 1 has a pair of circular edge portions 5e, 5f opposite each other, and a pair of straight edge portions 5g, 5h connecting the end portions of the circular edge portions 5e, 5f.

[0157] Reference Figure 47 and Figure 48 In the molding die 100 of the present embodiment, a semicircular shoulder portion 106 of a certain width is provided in the portion of the product portion 104 corresponding to the circular edge portion 5e. A single gate portion 105 of a semicircular cylindrical shape is provided on the side of the shoulder portion 106 opposite the product portion 104. The molten thermoplastic resin supplied from the injection molding unit of the molding machine to the gate portion 105 flows in one direction from the portion of the product portion 104 corresponding to the circular edge portion 5e toward the portion corresponding to the circular edge portion 5f after filling the shoulder portion 106.

[0158] Figure 49 and Figure 50The sheet member 1 taken out from the molding die 100 after the injection molding is shown. A first non-product portion 108 in a circular ring shape corresponding to the shoulder portion 106 is formed on the side of the circular arc edge portion 5e of the sheet member 1. A second non-product portion 109 in a semicircular column shape corresponding to the gate portion 105 is formed on the side opposite to the sheet member 1 of the first non-product portion 108.

[0159] In the product portion 104 of the cavity 103, the orientation of the thermoplastic resin is uniform in the flow direction of the thermoplastic resin, and thus a plurality of coherent pattern lines CL conceptually indicated by double-dot chain lines appear on the sheet member 1. Figure 46

[0160] (Seventh Embodiment)

[0161] Figure 51 The sheet member 1 of the seventh embodiment of the present application is shown.

[0162] The outer peripheral edge portion 5 of the sheet member 1 of the present embodiment has four edge portions like the fourth and fifth embodiments. Specifically, the outer peripheral edge portion 5 of the sheet member 1 has a pair of relatively short straight edge portions 5i, 5j opposite to each other, a relatively long straight edge portion 5k connecting these straight edge portions 5i, 5j, and a curved edge portion 5m opposite to the straight edge portion 5k.

[0163] Referring to Figures 52 to 54 In the molding die 100 in the present embodiment, an elongated rectangular shoulder portion 106 is provided in the portion of the product portion 104 corresponding to the straight edge portion 5k. A plurality of gate portions 105 are provided on the side opposite to the product portion 104 of the shoulder portion 106. The molten thermoplastic resin supplied from the injection unit of the molding machine to the gate portions 105 flows into the product portion 104 simultaneously with the shoulder portion 106 after being filled in the shoulder portion 106, as shown by the arrows of the dotted lines in Figure 54 More specifically, the molten thermoplastic resin flows in one direction from the portion of the outer peripheral edge portion 104b of the product portion 104 corresponding to the straight edge portion 5k toward the portion corresponding to the curved edge portion 5m.

[0164] Figure 55 The sheet member 1 taken out from the molding die 100 after the injection molding is shown. A first non-product portion 108 in a circular ring shape corresponding to the shoulder portion 106 is formed on the side of the circular arc edge portion 5e of the sheet member 1. A second non-product portion 109 in a semicircular column shape corresponding to the gate portion 105 is formed on the side opposite to the sheet member 1 of the first non-product portion 108.

[0165] ​(Eighth Implementation)

[0166] Figure 56 The sheet component 1 of the eighth embodiment of the present invention is shown.

[0167] When viewed from the relative directions of the main surfaces 1a and 1b, the sheet member 1 of this embodiment and the fourth and fifth embodiments ( Figure 34 , Figure 42 Like the first embodiment, it is rectangular, with the outer perimeter 5 having a pair of straight edges 5a, 5b and another pair of straight edges 5c, 5d connecting these two pairs of straight edges 5a, 5b. (Fourth and fifth embodiments) Figure 34 , Figure 42 In contrast to the flat sheet member 1 of the present embodiment, the sheet member 1 of this embodiment is curved and has a curved surface. In this embodiment, the sheet member 1 is curved only in the direction in which the straight edges 5a and 5b are opposite to each other. However, the sheet member 1 may also be a three-dimensional curved surface.

[0168] Reference Figures 57 to 59 In the molding die 100 of this embodiment, a long, narrow rectangular shoulder 106 of a certain width is provided on the part of the product portion 104 corresponding to the straight edge portion 5a. Multiple gate / sprue portions 105 are provided on the side of this shoulder 106 opposite to the product portion 104. Molten thermoplastic resin supplied from the injection molding unit of the molding machine to the gate / sprue portions 105 fills the shoulder 106, as... Figure 59 As indicated by the dashed arrow, the material flows simultaneously from the shoulder 106 into the product section 104. More specifically, as... Figure 59 As indicated by the dashed arrow, the molten thermoplastic resin flows in one direction from the portion of the outer peripheral portion 104b of the product portion 104 corresponding to the straight edge portion 5a toward the portion corresponding to the straight edge portion 5b.

[0169] Figure 60 The sheet member 1 is shown after injection molding is completed and removed from the molding mold 100. A first non-product portion 108, which is an elongated rectangle corresponding to the shoulder portion 106, is formed on the straight edge portion 5a side of the sheet member 1. A second non-product portion 109, which corresponds to the gate / sprue portion 105, is formed on the side of the first non-product portion 108 opposite to the sheet member 1.

[0170] Within the product section 104 of the cavity 103, the orientation of the thermoplastic resin is in the flow direction of the thermoplastic resin ( Figure 59 The dashed arrow (aligned with the line) appears on piece 1, thus appearing on piece 1. Figure 56 Multiple coherent pattern lines CL are conceptually represented by double-dotted lines. Specifically, multiple coherent pattern lines CL appear at intervals in the direction opposite to the straight edge 5a and the straight edge 5b. Furthermore, adjacent pairs of these coherent pattern lines CL do not intersect.

[0171] (Evaluation Test)

[0172] An evaluation test for verifying the dimensional stability of the gasket 4 of the first embodiment was performed. Six samples were used in this evaluation test. As shown in Table 1, samples S1, S2 were samples cut out from the long side portion 2A of the gasket 1 of the embodiment (Example). As shown in Table 1, samples S3 to S6 were samples cut out from the thin resin film 200 after extrusion molding (Comparative Example). Samples S3, S4 were elongated in the flow direction of the resin in extrusion molding (MD direction), and samples S5, S6 were elongated in the direction orthogonal to the MD direction (TD direction). Figure 61 Figure 62

[0173] The samples S1 to S6 were left in an environment of 80°C for 3 days, and the initial length and the length after 3 days were measured. The results of the evaluation test are shown in Table 2 below.

[0174] [Table 2]

[0175]

[0176] In the samples S1, S2 of the Example, the shrinkage in either of the long side direction and the short side direction was less than 0.6%, and, in contrast, in the samples S3 to S4 of the Comparative Example, the shrinkage in either of the MD direction and the TD direction exceeded 0.8%. The test results show that the gasket 1 of the present embodiment manufactured by injection molding has superior dimensional stability compared to the gasket made of the thin resin film after extrusion molding.

[0177] The present application can be applied to a gasket for other batteries such as a nickel-hydrogen battery, and other resin-made thin sheet members such as a separator, in addition to the gasket for a fuel cell.

[0178] Explanation of Reference Numerals

[0179] 1: Resin-made thin sheet member (sheet member);

[0180] 1a, 1b: Main surface;

[0181] 1c: Through hole;

[0182] 1d, 1e, 1f: Cutout;

[0183] 2A, 2B: Long side portion;

[0184] 3A, 3B: Short side portion;

[0185] 4: Inner side peripheral portion;

[0186] 5: Outer side peripheral portion;

[0187] ​​5a, 5b, 5c, 5d: straight line edge portion

[0188] 5e, 5f: circular arc edge portion

[0189] 5g, 5h: straight line edge portion

[0190] 5i, 5j, 5k: straight line edge portion

[0191] 5m: curved edge portion

[0192] 11A, 11B, 11C, 11D, 11E, 11F: edge portion

[0193] 100: molding die

[0194] 101: upper die

[0195] 102: lower die

[0196] 102a: cylindrical portion

[0197] 103: cavity

[0198] 104: product portion

[0199] 104a: inner side peripheral portion

[0200] 104b: outer side peripheral portion

[0201] 105: gate portion

[0202] 105a: gate portion

[0203] 105b: runner portion

[0204] 106: shoulder portion

[0205] 107: bobbin

[0206] 108: first non-product portion

[0207] 109: second non-product portion

[0208] 110: bobbin bushing

[0209] 110a: bobbin

[0210] 112: overflow portion

[0211] 113: third non-product portion

Claims

1. A resin sheet member having a pair of main surfaces opposing each other, a maximum thickness between the pair of main surfaces is 40 μm or more and 450 μm or less, both of the pair of main surfaces are flat, the resin sheet member has a region in which a plurality of linear coherent pattern lines arranged at intervals in a direction opposite to one edge portion and another edge portion opposite to the one edge portion appear when viewed from a direction normal to each of the pair of main surfaces, and a pair of the linear coherent pattern lines adjacent to each other do not cross each other, the resin sheet member is formed by injection molding of a thermoplastic resin, and in molding of the resin sheet member, orientation of the thermoplastic resin is uniform in a flow direction of the thermoplastic resin, whereby the plurality of linear coherent pattern lines appear.

2. The resin sheet member according to claim 1, wherein the region is 50% or more of a total area of the pair of main surfaces.

3. The resin sheet member according to claim 1, wherein a melt mass flow rate of the thermoplastic resin is 1 g / 10 min or more and 300 g / 10 min or less, and a heat of fusion is 0 mj / mg or more and 150 mj / mg or less.

4. A method of manufacturing the resin sheet member according to any one of claims 1 to 3, a molding die defining a cavity is prepared, the cavity having a product portion in which the resin sheet member is molded, a gate portion communicating with an injection unit of a molding machine, and a shoulder portion communicating with the gate portion and communicating with one edge portion of the product portion, the shoulder portion having a thickness greater than a thickness of the product portion, molten resin is supplied from the injection unit of the molding machine to the gate portion, and the molten resin flows into the product portion from the one edge portion after completely filling the shoulder portion, and flows toward another edge portion of the product portion opposite to the one edge portion.

5. The method of manufacturing the resin sheet member according to claim 4, wherein the thickness of the shoulder portion is 1.3 times or more and 24 times or less of the thickness of the product portion.

6. The method of manufacturing the resin sheet member according to claim 4, wherein an average thickness of the shoulder portion is 300 μm or more and 1200 μm or less.

7. The method of manufacturing the resin sheet member according to any one of claims 4 to 6, wherein the shoulder portion communicates with an entire region of an inner peripheral portion of the product portion, the molten resin flows into the product portion from the inner peripheral portion after filling the shoulder portion, and flows toward an outer peripheral portion of the product portion.

8. The method of manufacturing the resin sheet member according to any one of claims 4 to 6, wherein the shoulder portion communicates with an entire region of an outer peripheral portion of the product portion, the molten resin flows into the product portion from the outer peripheral portion after filling the shoulder portion, and flows toward an inner peripheral portion of the product portion.

9. The method of producing a resin sheet member according to any one of claims 4 to 6, wherein the outer peripheral portion of the product portion is composed of a plurality of edge portions, the shoulder portion communicates with one edge portion that constitutes a part of the outer peripheral portion of the product portion, the molten resin flows from the one edge portion toward another edge portion opposite to the one edge portion that constitutes a part of the outer peripheral portion after filling the shoulder portion.

10. The method of producing a resin sheet member according to any one of claims 4 to 6, wherein the resin is a thermoplastic resin having a melt mass flow rate of 10 g / 10 min or more and 300 g / 10 min or less, and a heat of fusion of 0 mj / mg or more and 150 mj / mg or less. ​ ​

Images