JP2017002974A - Manufacturing method of baseboard integrated gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent that curved regions which cannot exert seal functions due to the lack of heights are formed at both sides in a width direction, in a manufacturing method of a baseboard integrated gasket for molding a flat gasket integrated with a baseboard 1 by coating the baseboard 1 with a liquefied gasket molding material 30.SOLUTION: A mask 10 which is thinner in thickness than a thickness of a flat gasket which should be molded, and has a prescribed molding opening 11 having a prescribed pattern corresponding to a plane shape of the flat gasket is laminated on an upper face of a baseboard 1, a liquefied gasket molding material 30 having an adhesion property to the baseboard 1 is applied over the upper face of the baseboard 1 which is exposed from the molding opening 11 toward an upper face of the mask 10 so that a coating thickness t3 from the upper face of the baseboard 1 becomes thicker than a thickness of the mask 10, and after the molding material 30 is cured, the mask 10 is removed from the baseboard 1 together with a cured matter of the molding material which is formed on the upper face of the mask.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for manufacturing a substrate-integrated gasket composed of a flat gasket integral with a substrate by applying and curing a liquid gasket molding material on the upper surface of the substrate.

  As a kind of sealing component, as shown in FIG. 8, a substrate in which a flat gasket 2 made of a rubber elastic body (rubber material or synthetic resin material having rubber-like elasticity) having a flat upper surface is integrally formed on the upper surface of the substrate 1. There is an integral gasket. FIG. 9 shows a method using a mask and a spray as a typical prior art of a method for manufacturing such a substrate-integrated gasket. That is, in this manufacturing method, the planar shape of the gasket 2 shown in FIG. The substrate 1 is positioned and brought into contact with the lower surface of the mask 100 in which the molding openings 101 having a predetermined pattern corresponding to the substrate 100 are formed, and the gasket-forming liquid rubber 300 is sprayed from above the mask 100 using the spray coating device 200. By separating 1 from the mask 100, a coating layer is formed on the upper surface of the substrate 1 in a predetermined pattern. The flat gasket 2 shown in FIG. 8 is integrated with the substrate 1 simultaneously with molding by crosslinking and curing the coating layer of the liquid rubber by heat or the like.

  However, as shown in FIG. 10, the liquid rubber coating layer 301 adhering to the upper surface of the substrate 1 has a curved surface due to the surface tension of the liquid rubber at the parting (edge) 301a formed by the molding opening 101 of the mask 100. As shown in FIG. 11, the flat gasket 2 obtained by crosslinking and curing the liquid rubber in this shape is formed with regions 2a that do not perform a sealing function due to insufficient height on both sides in the width direction. There is a problem.

  FIG. 12 shows a method using screen printing as another typical prior art for manufacturing a substrate-integrated gasket. That is, in this manufacturing method, the planar shape of the gasket 2 shown in FIG. The substrate 1 is positioned and brought into contact with the lower surface of the mask 100 in which the molding openings 101 having a predetermined pattern corresponding thereto are formed, and the liquid rubber 300 for molding the gasket is supplied onto the screen 400 made of stainless mesh or the like disposed on the upper side of the mask 100. Then, the liquid rubber 300 is pushed out to the mask 100 by the squeegee 500 sliding on the screen 400 and attached to the upper surface of the substrate 1 through the molding opening 101, and then the substrate 1 is separated from the mask 100. A liquid rubber coating layer 301 is formed in a predetermined pattern on the upper surface of the substrate 1. Then, the coating layer 301 is crosslinked and cured by heat or the like, whereby the flat gasket 2 shown in FIG. 8 is integrated with the substrate 1 at the same time as molding (see, for example, Patent Document 1 below).

  However, even in this method, the liquid rubber coating layer 301 adhering to the upper surface of the substrate 1 has a curved raised shape due to the surface tension of the liquid rubber at the parting portion (edge) 301 a formed by the molding opening 101 of the mask 100. Therefore, there was a problem similar to that caused by spraying.

JP 2005-347119 A

  The present invention has been made in view of the above points. The technical problem of the present invention is that of a substrate-integrated gasket that forms a flat gasket integral with a substrate by applying a liquid gasket molding material to the substrate. In the manufacturing method, it is to prevent the formation of curved regions that cannot perform the sealing function due to insufficient height on both sides in the width direction.

The present invention employs the following means in order to solve the technical problems described above.
That is, the manufacturing method of the substrate integrated gasket according to the invention of claim 1 is for forming a predetermined pattern on the upper surface of the substrate which is thinner than the thickness of the flat gasket to be molded and corresponding to the planar shape of the flat gasket. A mask having an opening is stacked, and a liquid gasket molding material having adhesiveness to the substrate is applied from the upper surface of the substrate exposed from the molding opening to the upper surface of the mask. It is applied so as to be thicker than the thickness of the mask, and after the molding material is cured, the mask is separated from the substrate together with a cured product of the molding material formed on the upper surface thereof.

  According to the above method, the liquid gasket molding material is continuously applied from the upper surface of the substrate exposed from the mask molding opening to the upper surface of the mask, and the gasket molding material is applied to the upper surface of the substrate in the mask molding opening. Since this layer thickness is larger than the thickness of the mask, it is continuous with the coating layer of the gasket molding material applied to the upper surface of the mask, and the parting portion along the mask molding opening is not formed. For this reason, the bulging surface by surface tension is not formed along the opening for shaping | molding of a mask. Then, after the molding material is cured, when the mask is separated from the substrate, the cured product of the molding material formed on the upper surface of the mask breaks from the cured product of the molding material bonded to the upper surface of the substrate at the molding opening of the mask. However, since it is separated together with the mask, the flat gasket made of a cured product of the molding material bonded to the upper surface of the substrate in the opening for molding the mask has a flat upper surface up to its edge.

The present invention may further employ the following means in order to solve the above technical problem.
That is, the manufacturing method of the substrate integrated gasket according to the invention of claim 2 is the manufacturing method of the substrate integrated gasket having the above structure (invention 1), along the edge of the mask forming opening on the upper surface of the mask. In addition, a liquid storage groove is formed.

  In this way, the cured product of the molding material applied in the mask reservoir groove is in a state of being fitted into the reservoir groove and applied between the mask reservoir groove and the molding opening. Since the cured product of the molding material is formed thin, when the mask is separated from the substrate after the molding material is cured, the cured product of the molding material formed on the upper surface of the mask is broken along the thin part. It is easily separated from the flat gasket made of a cured product of the molding material bonded to the upper surface of the substrate at the mask molding opening.

  According to a third aspect of the present invention, there is provided a method for manufacturing a substrate-integrated gasket according to the above-described method for manufacturing a substrate-integrated gasket (Claim 1 or 2), wherein the mask is made of a material that is not bonded to the gasket molding material. It is a feature.

  If it does in this way, when the hardened | cured material of the molding material formed in the upper surface of a mask is removed with a mask, a mask can be repeatedly used by isolate | separating this hardened | cured material from a mask.

  According to the method for manufacturing a substrate-integrated gasket according to the present invention, a parting portion along the mask forming opening is not formed in the process of applying the molding material, so that the flat gasket formed integrally with the substrate is formed on both sides in the width direction. An area where the sealing function cannot be achieved due to insufficient height is not formed, and a product having excellent sealing properties can be obtained.

It is explanatory drawing which shows the state before application | coating by spraying in preferable embodiment of the manufacturing method of the board | substrate integrated gasket which concerns on this invention. It is explanatory drawing which shows the process in which an application layer is formed by spraying in preferable embodiment of the manufacturing method of the board | substrate integrated gasket which concerns on this invention. It is explanatory drawing which shows the state which hardened the application layer in preferable embodiment of the manufacturing method of the board | substrate integrated gasket which concerns on this invention. In preferred embodiment of the manufacturing method of the board | substrate integrated gasket which concerns on this invention, it is explanatory drawing which shows the state isolate | separated from the board | substrate with the hardened | cured material of the molding material formed in the upper surface. In other preferable embodiment of the manufacturing method of the board | substrate integrated gasket which concerns on this invention, it is explanatory drawing which shows the state before application | coating by screen printing. It is explanatory drawing which shows the process in which an application layer is formed by screen printing in other preferable embodiment of the manufacturing method of the board | substrate integrated gasket which concerns on this invention. In other preferable embodiment of the manufacturing method of the board | substrate integrated gasket which concerns on this invention, it is explanatory drawing which shows the state in which the coating layer was formed by screen printing. An example of a substrate-integrated gasket is shown, in which (A) is a plan view and (B) is a cross-sectional view along B-B ′ in (A). It is explanatory drawing which shows the process in which a coating layer is formed in the upper surface of a board | substrate by spraying in a prior art. In prior art, it is explanatory drawing which shows the state which formed the application layer on the upper surface of the board | substrate by spraying. It is explanatory drawing which shows the board | substrate integrated gasket manufactured by the prior art. It is explanatory drawing which shows the process in which a coating layer is formed in the upper surface of a board | substrate by screen printing in a prior art.

  Hereinafter, a preferred embodiment in which the method for producing a substrate-integrated gasket according to the present invention is applied to the production of the substrate-integrated gasket shown in FIG. 8 will be described with reference to the drawings. First, as shown in FIG. 1, a mask 10 is overlaid on the upper surface 1 a of the substrate 1. A spray application device 20 is disposed on the upper side of the mask 10. As shown in FIG. 8, the substrate 1 is made of a metal plate having a rectangular frame shape with rounded corners.

  The mask 10 has a wall thickness t1 that is thinner than the wall thickness t2 (see FIG. 4) of the flat gasket 2 to be molded on the upper surface of the substrate 1, and has a predetermined pattern corresponding to the planar shape of the flat gasket 2. 11 and made of a material having no adhesion to a cured product of a liquid rubber material described later. In addition, a liquid reservoir groove 12 is formed on the upper surface 10a of the mask 10 along the edge of the molding opening, and the chipping portion 13 between the molding opening 11 and the liquid reservoir groove 12 is slightly smaller than the upper surface 10a of the mask 10. Is formed low. The spray coating device 20 has a required number of spray nozzles 21 facing downward.

  Then, as shown in FIG. 2, a liquid rubber material 30 having adhesiveness to the substrate 1 is sprayed and applied from the spray nozzle 21 of the spray application device 20. At this time, the coating thickness t3 from the upper surface of the substrate 1 is applied so as to be thicker than the thickness t1 of the mask 10. The liquid rubber material 30 corresponds to a liquid gasket molding material.

  By doing so, a continuous coating layer 31 of the liquid rubber material 30 is formed from the upper surface 10 a of the mask 10 to the upper surface of the substrate 1 exposed from the molding opening 11 of the mask 10. In this case, a parting portion along the edge portion 11a of the molding opening 11 is not formed, that is, a bulging surface due to surface tension is not formed along the edge portion 11a of the molding opening 11.

  Next, the coating layer 31 thus formed is cured by heating at a predetermined temperature and a predetermined time, or by irradiation with ultraviolet rays when the liquid rubber material is of an ultraviolet curable type. As shown in FIG. 3, the cured product 32 of the coating layer is a film cured in a state of covering the product portion 32 a that is bonded to the upper surface of the substrate 1 in the molding opening 11 and the upper surface 10 a of the mask 10. 32b, a fitting portion 32c cured in a state of fitting with the liquid reservoir groove 12 in the liquid reservoir groove 12 of the mask 10, and a product portion 32a and a fitting portion 32c on the chipping portion 13 of the mask 10. The constricted portions 32d hardened in a constricted shape are formed continuously with each other, there is no parting along the edge 11a of the molding opening 11, and the upper surface is flat. Yes.

  Next, as shown in FIG. 4, when the mask 10 is peeled from the upper surface 1 a of the substrate 1, the cured product portion 32 a is bonded to the upper surface of the substrate 1 and cured in the liquid reservoir groove 12 of the mask 10. The constricted portion 32d is broken so as to be torn off by the razor portion 13 of the mask 10 (in other words, the edge portion 11a of the molding opening 11) between the fitting portion 32c. For this reason, the cured product on the mask 10, that is, the portion from the film-like portion 32b to the constricted portion 32d is broken along the relatively thin constricted portion 32d, and from the product portion 32a to the mask 10 as a burr 32 ′. Then, the substrate-integrated gasket shown in FIG. 8 comprising the substrate 1 and the product portion 32a (flat gasket 2) integrally molded on the upper surface of the substrate 1 can be taken out.

  Further, at this time, the burr 32 ′ on the mask 10 is hardened in a non-adhering state with the mask 10, but is fitted to the liquid reservoir groove 12 of the mask 10 in the fitting portion 32 c, so that the mask 10 The burr 32 ′ can be easily removed from the product portion 32 a together with the mask 10, while breaking the constricted portion 32 d when peeling the substrate from the substrate 1.

  As described above, since the upper surface of the cured product 32 shown in FIG. 3 is flat without a parting portion along the edge portion 11a of the molding opening 11, the burr 32 ′ is used as the mask 10. The product portion 32a (flat gasket 2) integrated with the substrate 1 after being removed together has a flat upper surface up to both edges, that is, a region where the sealing function cannot be achieved due to insufficient height on both sides in the width direction. Is not formed, and a sufficient seal width is secured. For this reason, the width of the flat gasket 2 and, consequently, the planar size of the substrate 1 can be reduced by the amount that the region that cannot perform the sealing function is not formed.

  Moreover, since the burr 32 ′ removed from the product portion 32 a together with the mask 10 is not bonded to the mask 10, it can be easily separated from the mask 10. For this reason, the mask 10 can be used repeatedly.

  FIGS. 5 to 7 show a case where the liquid rubber material 30 is applied to the substrate 1 by the screen printing device 40 as another preferred embodiment of the method for manufacturing a substrate-integrated gasket according to the present invention. is there.

  Also in this embodiment, first, as shown in FIG. 5, the mask 10 is overlaid on the upper surface 1 a of the substrate 1. Further, the mask 10 is thinner than the thickness t2 (see FIG. 4) of the flat gasket 2 to be molded on the upper surface of the substrate 1 and corresponds to the planar shape of the flat gasket 2 as described above. It has a predetermined pattern of molding openings 11 and is made of a material that does not adhere to the cured product of the liquid rubber material 30. A screen 41 in the screen printing apparatus 40 is disposed on the upper side of the mask 10.

  The screen 41 is made of stainless mesh or the like and is stretched horizontally on a frame (not shown). Then, a liquid rubber material 30 for forming a gasket having adhesiveness to the substrate 1 is supplied on the screen 41, and then, as shown in FIG. The liquid rubber material 30 is pushed out through the texture of the screen 41 while the screen 41 is pressed against the upper surface of the mask 10 by the squeegee 42. By doing so, a continuous coating layer 31 made of the liquid rubber material 30 extruded from the screen 41 is formed from the upper surface 10a of the mask 10 to the upper surface 1a of the substrate 1 exposed from the molding opening 11 of the mask 10. The

  At this time, since the squeegee 42 that pushes out the liquid rubber material 30 moves horizontally on the screen 41, the height of the upper surface of the coating layer 31 is higher than the upper surface 10 a of the mask 10, and thus the upper surface of the substrate 1. The coating thickness t3 from is thicker than the wall thickness t1 of the mask 10, and the upper surface of the coating layer 31 is flat. Accordingly, as shown in FIG. 7, the coating layer 31 is not formed with a parting portion along the edge 11a of the molding opening 11, that is, due to surface tension along the edge 11a of the molding opening 11. No bulging surface is formed.

  Next, as described above, the coating layer 31 thus formed is heated at a predetermined temperature and a predetermined time, or when the liquid rubber material is of an ultraviolet curable type, irradiation with ultraviolet rays is performed. To cure. Also in this case, as shown in FIG. 3, the cured product 32 of the coating layer covered the product portion 32 a cured in a state of being bonded to the upper surface of the substrate 1 in the molding opening 11 and the upper surface 10 a of the mask 10. The film portion 32b cured in the state, the fitting portion 32c cured to be fitted in the liquid reservoir groove 12 in the liquid reservoir groove 12 of the mask 10, and the product portion 32a on the chipping portion 13 of the mask 10. The constricted portion 32d which is hardened in a constricted shape between the fitting portion 32c and the fitting portion 32c is formed continuously, and there is no parting portion along the edge portion 11a of the molding opening 11, and the upper surface Is flat.

  Therefore, as shown in FIG. 4, by peeling the mask 10 from the upper surface 1 a of the substrate 1, the constricted portion 32 d is broken so as to be torn off by the razor portion 13 of the mask 10 (in other words, the edge portion 11 a of the molding opening 11). However, by separating the burr 32 ′ from the product portion 32 a together with the mask 10, the product portion 32 a (flat gasket 2) integrated with the substrate 1 can be taken out.

  In the embodiment described above, the spray device 20 or the screen printing device 40 is used to apply the liquid rubber material 30, but application by roll transfer using a roll coating device or a dip coating device is also used. A coating method using can also be employed.

DESCRIPTION OF SYMBOLS 1 Board | substrate 2 Flat gasket 10 Mask 11 Molding opening 11a Edge part 12 Reservoir groove 13 Beveling part 20 Spray coating apparatus 30 Liquid rubber material (liquid gasket molding material)
31 coating layer 32 cured product 32a product part 32b film-like part 32c fitting part 32d constricted part 32 'burr (cured product of molding material formed on the upper surface of the mask)
40 Screen printing device

Claims (3)

  On the upper surface of the substrate, a mask having a predetermined pattern corresponding to the flat shape of the flat gasket is overlapped with a mask thinner than the thickness of the flat gasket to be molded, and the substrate exposed from the molding opening is overlaid. A liquid gasket molding material having adhesiveness to the substrate is applied from the upper surface to the upper surface of the mask so that the coating thickness from the upper surface of the substrate is thicker than the thickness of the mask, and the molding material is cured. Thereafter, the mask is separated from the substrate together with a cured product of the molding material formed on the upper surface of the mask.   2. The method for producing a substrate-integrated gasket according to claim 1, wherein a liquid reservoir groove is formed on an upper surface of the mask along an edge portion of the molding opening of the mask.   3. The method of manufacturing a substrate-integrated gasket according to claim 1, wherein the mask is made of a material that is not bonded to the gasket molding material.

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