JP2010151268A - Gasket structure and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gasket structure in which a sealing base material and a gasket are strongly adhered without causing adhesion peeling between the sealing base material and the gasket during molding by a simple structure, and an effective method of manufacturing the same. <P>SOLUTION: In the gasket structure 1, a rubber gasket 3 is integrally fixed to a prescribed portion of the sealing base material 2 via an adhesive layer 4 by vulcanization molding. The gasket 3 includes a gasket body part 3a connected in a bead-like shape with a chevron-shaped cross section, an injection part 3c of a rubber material for molding provided at an appropriate location near a side part of the gasket body part 3a, and an inflow connecting part 3b of the rubber material between the gasket body part 3a and the injection part 3c. Roughening processing is applied to the surface of the connecting part 3b by a die during molding. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gasket structure in which a rubber gasket is integrally fixed to a predetermined portion of a base material to be sealed through an adhesive by vulcanization molding, for example, the entire periphery of a separator constituting a fuel cell stack and a medium opening The present invention relates to a gasket structure in which a gasket is integrally provided around a portion, or a gasket structure in which a cover and a gasket in a hard disk device or the like are integrated, and a method for manufacturing the same.

  As described above, examples of the gasket structure in which the base material to be sealed and the gasket are integrated include the prior art disclosed in Patent Documents 1 to 3. 6 and 7 conceptually show an example of such a gasket structure and a manufacturing method thereof. 6A is a plan view showing a part of the gasket structure in which the base material and the gasket are integrated, FIG. 6B is a cross-sectional view taken along line EE in FIG. c) is a sectional view taken along line FF in (a). FIG. 7 is a sectional view of a portion corresponding to FIG. 6C, which shows how to manufacture the gasket structure by molding.

  A gasket structure 50 shown in FIG. 6 is an annular rubber gasket that follows the shape of the annular groove 51a via an adhesive layer 52 at the bottom of the annular groove 51a formed in a predetermined portion of the base material 51 to be sealed. 53 is integrally fixed by vulcanization molding. The gasket 53 includes a gasket main body portion 53a that is continuous in a bead shape having a cross-sectional angle, a rubber inflow connection portion 53b that protrudes from an appropriate position at the bottom of the gasket main body portion 53a, and a rubber material in the inflow connection portion 53b. And an injecting portion 53c of rubber material at the time of molding, which remains as a burr mark on the inflow base portion (may not be visible).

  An example of manufacturing the gasket structure 50 as shown in FIG. 6 by molding a rubber material will be described with reference to FIG. A mold 60 shown in FIG. 7 is applied to an injection molding method or a transfer molding method, and includes a lower mold 61 and an upper mold 62. The lower mold 61 includes a cavity 61 a that can accommodate the base material 51. The upper mold 62 includes an annular cavity 62a formed so as to correspond to the shape of the gasket 53 and an injection gate 62b of unvulcanized rubber material 53R, and further connects the injection gate 62b and the cavity 62a. An inflow passage 62c for the unvulcanized rubber material 53R is formed to communicate with the cavity 62a. One or more such injection gates 62b and inflow passages 62c are provided along the outer side of the annular cavity 62a.

In the mold 60, first, the base 51 is placed in a cavity 61a formed in the lower mold 61, and an adhesive 52R is applied to the bottom of the annular groove 51a in the base 51, and then the upper mold is applied. The mold 62 is clamped to the lower mold 61. Then, an unvulcanized rubber material 53R is injected into the injection gate 62b from an injection device (not shown), and the injected rubber material 53R reaches the inside of the cavity 62a through the inflow path 62c by the injection pressure. When the cavity 62a is sufficiently filled with the rubber material 53R, the pressure maintaining state is maintained and the rubber material 53R is vulcanized. This vulcanization is performed by heating the mold or by heat held by the unvulcanized rubber material 53R, and the curing of the adhesive 52R is promoted along with this vulcanization. Thereafter, when the mold is removed and the rubber material remaining on the injection gate 62b is cut off, the gasket 53 is integrally fixed to the bottom of the annular groove 51a of the base material 51 to be sealed via the adhesive layer 52 as shown in FIG. A gasket structure 50 is obtained.
JP 2004-76877 A JP 2008-1002 A JP 2008-10297 A

  By the way, in the molding method as described above, after completion of the injection of the rubber material, in order to complete the vulcanization reaction of the rubber material or the curing reaction (adhesion reaction) of the adhesive, the injection is performed from the injection device as described above. A pressure is applied and the pressure is maintained for a certain time. If this holding pressure is not appropriate, the rubber material 53R flows and is fixed to the adhesive 52R and the adhesive 52R even though the portion of the upper mold 62 that contacts the inner surface of the cavity 62a has been vulcanized to some extent. Shear stress is generated at the interface with the rubber material 53R. When the shear stress exceeds the hot strength (adhesive strength in the curing process) of the adhesive 52R, adhesive peeling occurs. When the holding pressure is too strong, the rubber material 53R flows due to the pressure, and when it is too weak, the rubber material 53R flows due to thermal expansion of the rubber material 53R, and shear stress is generated at the bonding interface. Furthermore, if the surface of the mold cavity is treated to reduce the frictional resistance by using a mold surface treatment or using a mold release agent, etc., the fluidity of the rubber material at the time of holding pressure increases, or the thickness of the gasket is reduced. If it cannot be ensured, adhesive peeling due to shear stress is likely to occur.

  In the molding method as described above, since the unvulcanized rubber material 53R is injected at a high pressure from the injection gate 62b, it is applied in the vicinity of the injection gate 62b by the pressure at the time of this injection. A shear stress acts on the adhesive 52 </ b> R, and the adhesive 52 </ b> R peels from the surface of the base material 51 to be sealed in the curing process, so that a sufficient adhesive force may not be obtained.

  Adhesion peeling due to shear stress at the time of holding the pressure or at the time of injection of the rubber material is likely to occur in the vicinity of the injection portion 53c. However, in the case of the gasket structure 50 as described above, the width of a predetermined portion of the base material to which the gasket is to be fixed is limited due to the characteristics of the base material to which the gasket structure 50 is applied. The injection gate 62b is unavoidably provided at a position close to the side of the cavity 62a due to the restriction. Therefore, the range a where the adhesiveness in the vicinity of the injection portion 53c shown by the two-dot chain line in FIG. 6A extends to the gasket main body portion 53a, and this is one factor that deteriorates the sealing performance as the gasket 53. There was.

  Patent Documents 1 to 3 do not intend to solve the above-mentioned specific problems. In particular, in Patent Document 2, the opening of the injection gate has a long diameter along the longitudinal direction of the gasket in view of the fact that the injection property of the rubber material deteriorates due to the injection gate being close to the gasket. It does not mention the problem of adhesion in the vicinity of the gate.

  The present invention has been made in view of the above circumstances, and has a gasket structure that is firmly bonded with a simple structure without causing adhesion peeling between the base material to be sealed and the gasket at the time of molding, and an effective manufacturing method thereof. The purpose is to provide.

  A gasket structure according to a first aspect of the present invention is a gasket structure in which a rubber gasket is integrally fixed to a predetermined part of a base material to be sealed via an adhesive layer by vulcanization molding, and the gasket has a mountain-shaped cross section. A gasket main body portion continuous in a bead shape, an injection portion of a rubber material at the time of molding provided in a position near a side portion of the gasket main body portion, and an inflow connecting portion of the rubber material between the gasket main body portion and the injection portion And the surface of the connecting portion is roughened by a mold during molding.

  In the gasket structure of the present invention, the surface of the gasket main body may be subjected to a roughening process using a mold during molding.

  In the gasket structure of the present invention, the predetermined portion may be a bottom portion of an annular groove formed in a base material to be sealed.

  A method for manufacturing a gasket structure according to a second aspect of the present invention includes a cavity corresponding to a gasket shape including application of an adhesive to a predetermined portion of a base material to be sealed, and a gasket body portion having a cross-sectionally continuous bead shape. After placing the base material to be sealed on the mold, the unvulcanized rubber material is injected into the cavity from the injection gate formed on the mold, and the predetermined base portion of the base material to be sealed is injected. A method for manufacturing a gasket structure in which a rubber material is integrally vulcanized and molded so as to have the above-described gasket shape, wherein the cavity of the mold extends from the injection gate to a portion corresponding to the gasket main body on the side thereof. An inflow path for rubber material is provided, and the inner surface of the inflow path is a roughened surface, and the flow of unvulcanized rubber material in the inflow path after completion of injection into the cavity at the time of molding is formed by the roughened surface. Characterized in that so as to suppress sex.

  In the method for manufacturing a gasket structure according to the present invention, the inner surface of the cavity may be a roughened surface.

  Moreover, in the manufacturing method of the gasket structure of this invention, it is desirable for the surface roughness of the roughening process surface in the said metal mold | die to be Ra0.2-10 or Rz0.5-50.

  In the gasket structure according to the first invention, a rubber gasket is integrally fixed to a predetermined portion of the base material to be sealed via an adhesive layer by vulcanization molding. The base material to be sealed and the gasket will not be separated even in the flow of transportation or the like. The gasket structure is brought into an assembly plant such as a fuel cell or a hard disk device as it is, and is fastened integrally with another seal target member, so that the seal target base material and the other seal target member are interposed. A rubber gasket is clamped in a compressed state, and a seal is made between them. Therefore, in the above assembly plant, the work of interposing a separately prepared gasket between the sealing target members is not required, and the efficiency of the assembling work is improved.

  Further, in the gasket structure of the present invention, the surface of the connecting portion is subjected to a roughening treatment by a mold during molding, so that shear due to the flow of the rubber material during holding pressure during molding is performed. The adhesive peeling between the sealing target base material and the gasket due to the stress does not occur, and the gasket is firmly integrated with a predetermined portion of the sealing target base material. In particular, in the vicinity of the rubber material injection portion, the fluidity of the rubber material at the time of the above pressure holding is remarkable, but this fluidity is suppressed by the roughening treatment by the mold at the time of molding, and as a result, the adhesion peeling Even when the injection part and the gasket main body are close to each other, there is no concern that the sealing performance deteriorates due to the adhesion peeling near the injection part. Therefore, even when the width of the predetermined portion of the base material to be sealed to which the gasket is to be fixed is limited, a gasket structure having excellent sealing performance can be obtained.

  When the predetermined portion is the bottom of the annular groove formed in the base material to be sealed, stable fixation and integration between the gasket and the base material to be sealed is achieved. In this case, the width of the predetermined portion is limited by the width of the annular groove, but this gasket structure is not affected by the molding due to such limitation and has a good sealing function. is there.

  According to the method for manufacturing a gasket structure according to the second invention, after applying an adhesive to a predetermined portion of the base material to be sealed, the unvulcanized rubber material is put into the cavity from the injection gate formed in the mold. Since the rubber material is integrally vulcanized and molded so as to form the gasket shape at a predetermined portion of the base material to be sealed, the curing of the adhesive is promoted together with the vulcanization of the rubber material, A rubber gasket is firmly fixed and integrated at a predetermined portion of the base material to be sealed.

  And since the inner surface of the inflow path of the rubber material provided at the side of the cavity of the mold is a roughened surface, the fluidity of the rubber material during molding is suppressed by this roughened surface. Is done. Therefore, at the time of holding pressure after completion of the injection of the rubber material, even if the holding pressure is increased, the generation of shear stress at the interface with the adhesive accompanying the flow of the rubber material is suppressed, and adhesion peeling hardly occurs. Further, even if the holding pressure is weakened, the backflow associated with the thermal expansion of the rubber material is suppressed, and adhesion peeling due to this is less likely to occur. Accordingly, the holding pressure can be easily adjusted, and there is no concern that the sealing performance is deteriorated due to inadequate holding pressure adjustment. Furthermore, even when the rubber material is injected at a high pressure, the roughened surface of the inner surface of the inflow path suppresses the fluidity of the rubber material after completion of the injection into the cavity. Occurrence of shear stress at the interface with the agent is suppressed, and adhesion peeling hardly occurs. Therefore, even when there is a restriction on the width of the predetermined part where the gasket is fixed and integrated, and the distance between the injection gate and the cavity must be reduced, the rubber material and the base material to be sealed in the vicinity of the injection gate Can be secured. In addition, after the molding is completed, the rubber material remaining in the injection gate is pulled and cut and removed in a mold-clamped state, but the inflow path portion is held without being displaced from the mold by the roughened surface. It is easily cut and removed without causing peeling.

When the inner surface of the cavity is also a roughened surface, the fluidized surface of the unvulcanized rubber material in the cavity at the time of molding is suppressed by the roughened surface. Thus, a gasket structure in which the gasket and the base material to be sealed are firmly integrated is obtained. As described above, the adhesive peeling due to the fluidity of the rubber material is less likely to occur over the entire gasket, so that it is possible to perform a mold surface treatment or a release agent treatment for the purpose of improving the releasability.
Incidentally, JP-A-7-214600 and JP-A-2003-287139 disclose examples in which a cavity surface of a molding die is subjected to a roughening treatment. It is not intended to suppress the fluidity of the molding material during molding.

  When the surface roughness of the roughened surface of the mold is Ra 0.2 to 10 or Rz 0.5 to 50, the fluidity of the rubber material is preferably suppressed. Incidentally, when the surface roughness is less than Ra0.2 or less than Rz0.5, fluidity suppression tends not to be sufficiently exhibited. Further, when the surface roughness exceeds Ra10 or exceeds Rz50, the fluidity suppressing action is too strong and the injectability of the rubber material tends to deteriorate. Examples of such a roughening treatment method for the inner surface of the mold include a shot blasting method using metal beads or glass beads, an electric discharge machining method using electrodes, and a cutting method using a milling machine.

  In the present invention, as the rubber material constituting the gasket, any rubber material selected from NBR, H-NBR, ACM, AEM, FKM, EPDM, VMQ and the like is desirably employed. In addition, as the adhesive constituting the adhesive layer, a thermosetting adhesive is used, and specifically, an epoxy-based, phenol-based, coupling agent-based, imide-based, or rubber glue-based adhesive is desirable. Adopted. This adhesive is cured at the vulcanization temperature at the time of vulcanization molding of the rubber material, and causes a chemical reaction at the interface between the rubber material and the base material to be sealed at the time of curing, so that both the bonded members are firmly integrated. To do.

  The best mode for carrying out the present invention will be described below with reference to the drawings. 1 is a plan view showing an example in which the gasket structure of the present invention is applied to a separator of a fuel cell, FIG. 2 is an enlarged view of a portion A in FIG. 1, and FIG. 3 (a) is an arrow along line BB in FIG. Sectional view, FIG. 3 (b) is a sectional view taken along the line CC in FIG. 2, FIGS. 4 (a), 4 (b), and 4 (c) show the procedure for manufacturing the gasket structure by molding, (a) Sectional drawing shown by the part corresponding to FIG.3 (b), (b) is the DD sectional view taken on the line in (a), (c) is a figure similar to (b) of other embodiment. FIG. 5 is a view similar to FIG. 2 of another embodiment of the gasket structure.

  A gasket structure 1 shown in FIG. 1 is a separator for a fuel cell, and is combined with a polymer electrolyte membrane (not shown) to constitute a fuel cell configuration stack (not shown). The separator as the gasket structure 1 is obtained by integrally fixing a rubber gasket 3 to a predetermined portion of a base material 2 to be sealed via an adhesive layer (see FIG. 3) 4. The base material 2 to be sealed includes a plurality of openings 2a for circulating a medium such as refrigerant, hydrogen, oxygen, etc. at appropriate positions. An annular groove (around the entire periphery of the base material 2 to be sealed and the openings 2a ... 2b) is formed. The bottom of the annular groove 2b is a predetermined portion to which the gasket 3 is integrally fixed. When the gasket 3 is integrally fixed to the annular groove 2b, a plurality of the stacks are tightened to form a fuel cell. Thus, leakage of the medium is prevented.

  The rubber gasket 3 includes a gasket main body portion 3a continuous in a bead shape having a cross-sectional angle, a rubber inflow connecting portion 3b at the time of molding projecting from an appropriate position at the bottom of the gasket main body portion 3a, and the inflow And a rubber material injection portion 3c at the time of molding which remains as a burr mark on the inflow base portion of the rubber material in the connecting portion 3b (which may not be visible). And the surface of the site | part ranging from this connection part 3b to the gasket main-body part 3a is roughened by the metal mold | die at the time of the shaping | molding mentioned later.

  Here, a method for manufacturing the gasket structure 1 by molding will be described with reference to FIGS. 4 (a), 4 (b), and 4 (c). (B) (c) is a sectional view taken along line DD in (a), and shows a state before the rubber material is injected. In FIG. 4, the mold 5 used for the production is applied to the injection molding method or the transfer molding method as described above, and includes a lower mold 6 and an upper mold 7. The lower mold 6 includes an annular cavity 6 a that can accommodate the sealing target substrate 2. The upper mold 7 includes an annular cavity 7a formed so as to correspond to the shape of the gasket 3 and an injection gate 7b of the unvulcanized rubber material 3R, and further connects the injection gate 7b and the cavity 7a. An inflow passage 7c for the unvulcanized rubber material 3R is formed so as to communicate with the cavity 7a. One or more such injection gates 7b and inflow passages 7c are provided along the outer side of the annular cavity 7a.

  In the example of FIG. 4B, the range extending to the inner surface of the inflow path 7c of the upper mold 7 and the partial inner surface of the cavity 7a is the roughened surface 7d. 4C, in addition to the example of FIG. 4B, the entire inner surface of the cavity 7a is a roughened surface 7e. As described above, the roughened surfaces 7d and 7e have a surface roughness of Ra 0.2 to 10 or Rz 0.5 to 50, as described above, a shot blast method using metal beads or glass beads, an electric discharge machining method using electrodes. It is formed by a cutting method using a milling machine.

  In the mold 5, first, the base material 2 to be sealed is disposed in a cavity 6 a formed in the lower mold 6, and an adhesive 4 </ b> R is applied to the bottom of the annular groove 2 b of the base material 2 to be sealed. The upper die 7 is clamped and joined to the lower die 6 above. In this case, an adhesive 4R may be applied to the bottom of the annular groove 2b before the sealing target substrate 2 is disposed in the cavity 6a. Then, the unvulcanized rubber material 3R is injected into the injection gate 7b from an injection device (not shown), and the injected rubber material 3R reaches the inside of the cavity 7a through the inflow path 7c by the injection pressure.

  When all the cavities 7a are sufficiently filled with the rubber material 3R, the pressure is maintained and the rubber material 3R is vulcanized. This vulcanization is performed by heating the mold or by heat held by the unvulcanized rubber material 3R, and the curing of the adhesive 4R is promoted along with this vulcanization. In this pressure holding state, the fluidity of the rubber material 3R is suppressed by the frictional resistance of the roughened surface 7d. Thereafter, if the rubber material remaining on the injection gate 7b is cut out and removed, as shown in FIGS. 1 to 3, the bottom of the annular groove 2b of the base material 2 to be sealed is made of rubber via the adhesive layer 4 The gasket structure 1 to which the gasket 3 is integrally fixed is obtained.

  In the molding process, as described above, the unvulcanized rubber material 3R is injected from the injection gate 7b at a high pressure. Further, the adhesive 4R may be peeled off from the surface of the base material 2 to be sealed due to the holding pressure at the time of holding pressure, and sufficient adhesive force may not be obtained. Since the injection pressure or holding pressure of the unvulcanized rubber material 3R decreases as the distance from the injection gate 7b increases, the influence on the adhesive force is reduced in a region above a certain range. In FIG. 2, a range b indicated by a two-dot chain line is shown as a range in which sufficient adhesive force may not be obtained due to the influence of the injection pressure or holding pressure of the unvulcanized rubber material 3R. The entire surface is roughened. And the said roughening process surface 7d of the upper metal mold | die 7 is formed in the site | part corresponding to this range b.

  As described above, since the inner surface of the upper mold 6 including the inflow path 7c from the injection gate 7b and into the cavity 7a is the roughened surface 7d, the unvulcanized rubber is brought into the high pressure state from the injection gate 7b. Even when the material 3R is injected and the holding pressure is increased during holding, the fluidity of the rubber material 3R is suppressed. Due to the fluidity suppressing action of the rubber material 3R, the shear stress generated at the interface between the adhesive 4R and the rubber material 3R fixed to the adhesive 4R is reduced. Therefore, by setting the surface roughness of the roughened surface 7d as described above, this shear stress can be prevented from exceeding the hot strength of the adhesive 4R, thereby preventing the adhesion peeling at the interface. It becomes difficult to occur. Further, after the molding is completed, the rubber material remaining on the injection gate 7b is pulled and cut and removed in a mold-clamping state, but the inflow path 7c portion is held without being displaced from the mold 5 by the roughened surface 7d. Therefore, the gasket 3 can be easily cut and removed without causing the gasket 3 to peel off. Furthermore, at the time of holding pressure, the shear stress generated by the holding pressure when the holding pressure is too strong and the back flow accompanying the thermal expansion of the rubber material 3R when it is too weak is weakened by the fluidity suppressing action of the rubber material 3R. Therefore, delicate adjustment of the holding pressure is not required, and the production efficiency can be improved.

In the case of the example of FIG. 4 (c), the inner surface of the upper mold 7 has a rough surface in which the entire surface of the cavity 7a is set to the same surface roughness in addition to the roughened surface 7d. FIG. 5 shows a gasket structure 1 </ b> A molded using such an upper mold 7. The gasket structure 1A obtained in this way is such that the gasket 3 and the base material 2 to be sealed are firmly fixed and integrated. In addition, since the gasket 3 and the base material 2 to be sealed can be firmly fixed and integrated as described above, the mold surface treatment or the release agent treatment performed for the purpose of improving the releasability can be performed. Efficiency can be further improved.
The other configurations in FIG. 4C and FIG. 5 are the same as those in FIG. 4B and FIG. 2, respectively.

  In the above embodiment, the predetermined portion where the gasket 3 of the base material 2 to be sealed is integrally fixed is the bottom of the annular groove 2b. However, the flat portion having no restriction on the effective width without such an annular groove. It may be. Moreover, although the example applied to the separator of the fuel cell has been described, the present invention can also be applied to a hard disk device and other devices that are provided for distribution in a state where the sealing target base material and the gasket are integrally fixed. it can.

It is a top view which shows the example which applied the gasket structure of this invention to the separator of the fuel cell. It is an enlarged view of the A section in FIG. (A) is the BB arrow directional cross-sectional view in FIG. 2, (b) is CC sectional view taken on the line in FIG. (A) (b) (c) shows the point which manufactures the gasket structure body by molding, (a) is a sectional view shown by a portion corresponding to FIG. 3 (b), (b) is D in (a). -D arrow sectional drawing, (c) is a figure similar to (b) of other embodiment. It is a figure similar to FIG. 2 of other embodiment. The example of the conventional gasket structure is shown, (a) is a top view which shows a part of the gasket structure, (b) is the EE arrow sectional view in (a), (c) is (a). The FF line arrow directional cross-sectional view in is shown. It is sectional drawing which shows the point which manufactures the conventional gasket structure by shaping | molding by the part corresponding to FIG.6 (c).

Explanation of symbols

1, 1A gasket structure 2 base material to be sealed 2b annular groove (predetermined part)
DESCRIPTION OF SYMBOLS 3 Gasket 3a Gasket body part 3b Inflow connection part of rubber material 3c Injection part of rubber material 3R Unvulcanized rubber material 4 Adhesive layer 4R Adhesive 5 Mold 7 Upper mold (mold)
7a Cavity 7b Injection gate 7c Inflow path 7d Roughening surface 7e Roughening surface

Claims (6)

A gasket structure in which a rubber gasket is integrally fixed to a predetermined portion of a base material to be sealed through an adhesive layer by vulcanization molding,
The gasket includes a gasket main body portion that is continuous in a bead shape having a cross-sectional angle, an injection portion of a rubber material that is provided at an appropriate position near a side portion of the gasket main body portion, and a gap between the gasket main body portion and the injection portion. A gasket structure having a rubber material inflow connecting portion, and a surface of the connecting portion is subjected to a roughening treatment by a mold during molding. The gasket structure according to claim 1,
Furthermore, the surface of the said gasket main-body part is roughened with the metal mold | die at the time of shaping | molding, The gasket structure characterized by the above-mentioned. In the gasket structure according to claim 1 or 2,
The gasket structure according to claim 1, wherein the predetermined portion is a bottom portion of an annular groove formed in a base material to be sealed. Application of adhesive to a predetermined portion of the base material to be sealed, and placement of the base material to be sealed on a mold having a cavity corresponding to a gasket shape including a gasket main body portion having a cross-sectionally continuous bead shape. After that, an unvulcanized rubber material is injected into the cavity from an injection gate formed in the mold, and the rubber material is integrally vulcanized and molded so as to have the gasket shape at a predetermined portion of the base material to be sealed. A method for manufacturing a gasket structure,
The cavity of the mold is provided with a rubber material inflow path from the injection gate to a portion corresponding to the gasket main body on the side, and the inner surface of the inflow path is a roughened surface. A method for producing a gasket structure, characterized in that the fluidity of an unvulcanized rubber material in an inflow path after completion of injection into a cavity at the time of molding is suppressed by a surface treatment surface. In the manufacturing method of the gasket structure according to claim 4,
Furthermore, the manufacturing method of the gasket structure characterized by making the inner surface of the said cavity into the roughening process surface. In the manufacturing method of the gasket structure according to claim 4 or 5,
A method for producing a gasket structure, wherein the surface roughness of the roughened surface of the mold is Ra 0.2 to 10 or Rz 0.5 to 50.

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