JP2011201105A - Production method of seat pad and the seat pad - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method of a seat pad, and the seat pad produced by the production method improving mold accuracy by prohibiting an underfill part from generation in the seat pad.SOLUTION: The production method of seat pad to foam-mold the seat pad while allowing discharge of the staying gas G in a mold from the mold partition part PL is characterized in that a mold position of tip of narrowed end section 116b is set in a molding region where a mold partition part PL of foam molding mold lies, in that it has a gas guide installation step for arranging a gas guide 12 with a passage allowing passing a staying gas G in the molding region of narrowed end section 116b so that the staying gas G guided through the passage may head in the direction of mold partition part PL, and in that it performs a foam molding step after the gas guide installation step, wherein the seat pad is prepared with narrowed end sections 116b, 118b narrowed down in wall thickness along with an edge section by means of the mold to form molding surfaces with a plurality of mold members (22, 24, 26).

Description

  The present invention relates to a seat pad manufacturing method and a seat pad, and more particularly to a resin seat pad manufacturing method and a seat pad having an end narrowed portion with a reduced thickness at an end edge portion.

  Resin seat pads are used to form various seats. For example, FIG. 10 shows an overall configuration of a front seat 100 of an automobile formed by covering the seat pads. As shown in the figure, the front seat 100 including the seat pad includes a seat cushion portion 102 for supporting the occupant's buttocks and a seat back portion 104 for supporting the back portion.

  11A and 11B illustrate the configuration of the seat back pad 110 included in the seat back portion 104 as a constituent member of the seat pad. In addition, what has a basic shape is shown for clarification of a figure. The figure (a) has shown the schematic shape seen from back (back side), and the figure (b) has each shown the longitudinal cross-section (II cross section). As shown in the drawing, the seat back pad 110 has a pad main body part 112 whose front side is a backrest part of an occupant, and a flange extending rearward while maintaining a gap between the pad main body part 112 and the back side surface of the pad main body part 112. Part 114 (upper flange part 116, side flange part 118).

  Further, the reinforcing material 111 is present over the entire area of the inner side surface 110a, which is the back side surface of the seat back pad 110 formed by the pad main body portion 112 and the flange portion 114. That is, as will be described later, foam molding is performed in a state where the reinforcing agent 111 is previously disposed on the core mold for molding the inner side surface 110a.

  The upper flange 116 of the flange part 114 extends further downward from the upper thick part 116a extending from the upper end of the pad main body part 112 and the upper thick part 116a, as can be understood from FIG. Thus, the upper end narrowed portion 116b whose thickness is reduced (thickness decreases) is provided.

  Similarly, the side flange 118 also extends from the both side ends of the pad main body 112 to the rear side thick part 118a, and further extends from the side thick part 118a toward the center of the pad main body part 112. It has a side end narrowing part 118b in which the wall thickness decreases. That is, the upper end throttle part 116b having a predetermined width and the side thick part 118a are continuous along the edge of the flange part 114.

  The side flange 118 is formed with an opening 126 having a substantially rectangular shape when viewed from the side. In general, in foam molding of a seat pad in which a narrowed portion is formed at such an edge portion, a gas pool or the like may occur at a corner portion of a thick portion of a front portion of a portion where the thickness is narrowed. In particular, in the formation of the seat pad (seat back pad 110) having the flange portion 114 extending from the pad main body portion 112 as described above, the occurrence of a lacking portion is pointed out.

  The seat back pad 110 is generally molded by a foam mold 20 as shown in FIGS. 12 (a) and 12 (b). In addition, the figure (a) has shown the state which clamped, and the figure (b) has each shown the mold open state. As shown in the figure, the foaming mold 20 includes a lower mold 22, an upper mold 24 that is clamped with respect to the lower mold 22, and a core mold 26 that is driven by a piston cylinder 28. When the foam mold 20 is changed from the mold open state to the mold clamped state of FIG. 5A, a cavity 30 for molding the seat back pad is formed between the molding surfaces of the molds. .

  Further, the flange portion 114 shown in FIG. 11 is formed in the flange cavity portion 30a between the upper die 24 and the core die 26. An upper mold extending portion 24a extending outward from the upper mold 24 that forms a mold surface of the front end portion (including the upper end narrowing portion 116b) of the flange portion 114, and the flange portion 114 A mold dividing portion PL is formed between opposing surfaces of a core mold extending portion 26a that extends outward from the core mold 26 that molds the tip portion. In other words, there is a mold dividing portion PL capable of exhausting stagnant gas in the region of the flange cavity portion 30a for forming from the upper thick portion 116a which is the tip portion of the flange portion 114 to the upper end throttle portion 116b. is doing.

  As shown in the figure, the reinforcing material 111 is attached in advance to the surface of the core mold 26 so that the reinforcing material 111 is positioned on the back surface of the seat back pad when the foam molding is completed. It is set. The reinforcement member 111 is disposed using a fixing member such as a magnetic seal, for example.

  However, when the flange portion 114 of the seat back pad 110 is formed by the foam molding die 20 as described above, the foamable resin material bypasses the core die 26 and flows into the flange cavity portion 30a. Therefore, the fluidity of the air mixed in the foamable resin material and the carbon dioxide gas generated at the time of foaming is lowered, and in particular, the flow state of the foamable resin material at the corner portion of the flange cavity portion 30a may be poor. is there. As a result, as described above, gas tends to collect on the surface of the portion where the upper thick portion 116a of the flange cavity portion 30a and the side thick portion 118a are formed, and exists at the tips of the end throttle portions 116b and 118b. In some cases, the gas cannot be effectively discharged from the mold dividing part PL to be formed, and a thin portion (thickness) may occur on the surface of the thick portion of the molded product. That is, the staying gas G shown in FIG. 2B and FIG. 8 to be described later remains in the state shown in the figure, and the molding is finished.

  Further, when the opening 126 is formed in the side flange 118 as shown in FIG. 11, the portion from the side thick part 118a to the side end narrowing part 118b forming the opening edge. As for, since it bypasses the core mold and bypasses the opening 126, the fluidity of the foamable resin material at that part is lowered, and the occurrence frequency of the lacking part becomes higher than other parts. Yes.

  When a lacking part occurs, it is necessary to repair the lacking part by applying a build-up process later, so that the molding efficiency and molding accuracy of the seat back pad 110 are reduced. Various techniques for improving the seat pad molding efficiency and molding accuracy have been proposed.

  Patent Document 1 discloses a seat pad manufacturing method that adjusts the flow direction of a foamable resin material when the foamable resin material is allowed to flow into a cavity between an upper mold and a core mold for molding the flange portion 114. It is disclosed. FIG. 13 is a schematic cross-sectional view of the foam molding die 130 disclosed in Patent Document 1. As illustrated, the upper die 132 and the core die 134 are clamped with respect to the lower die 136, and A first cavity 140a for forming the flange portion 114 is formed between the mold 132 and the core mold 134. A reinforcing material 138 is stretched on the core mold 134. A flow direction adjusting fin 142 is formed to protrude from the end of the reinforcing member 138.

  With this flow direction adjusting fin 142, the flow direction of the foamable resin material M is changed outward as indicated by the arrow A, and the flow path is changed so as to more accurately follow the molding surface of the upper mold 132. Thereby, the filling state of the foamable resin material M is improved.

JP 2005-125695 A

  However, according to the seat pad manufacturing method described in Patent Document 1, although the flow direction of the foamable resin material M can be adjusted, air mixed in the foamable resin material M, carbon dioxide gas generated during foaming, or the like The foamable resin material M is made to flow while the gas is contained in the cavity 140 or in the foamable resin material, and it is not configured to avoid the occurrence of a lacking part due to gas discharge or elimination. It is not possible to sufficiently achieve the elimination of the lacking portion at the end of the product. In particular, it is not possible to expect a sufficient improvement in the forming accuracy of the seat pad that has the above-described flange portion that curves backward and has an end throttle portion at the tip.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a seat pad manufacturing method capable of effectively avoiding the occurrence of a lacking portion and enhancing molding accuracy in foam molding of a seat pad. And it is providing the seat pad manufactured by the said manufacturing method.

In order to achieve the above object, a method of manufacturing a seat pad according to the invention according to claim 1 comprises:
Using a molding die that forms a molding surface with a plurality of mold constituent members, the sheet pad formed with a narrowed end portion along the end edge portion, and a retained gas mold dividing portion in the molding die In the manufacturing method of the seat pad that performs foam molding while allowing discharge from the molding position of the tip portion of the end drawing portion is set to a molding region where the mold dividing portion of the foam molding die exists, A gas derivative having a passage through which the staying gas can pass, disposed in a region where the end restricting portion is formed so that the staying gas guided in the passage is directed toward the mold dividing portion. It has an installation step, and a foam molding step is performed after the gas derivative installation step.

  According to this configuration, since the gas derivative is installed in the end throttle portion so as to go in the direction of the mold dividing portion by the passage formed in the inside thereof, the vicinity of the end throttle portion in which the retained gas is likely to remain. It is possible to eliminate gas accumulation in the thick part. That is, at the time of foam molding, the staying gas can be guided from the thick part side through the passage of the gas derivative to the mold dividing part and discharged from the mold dividing part.

  In addition, the presence of the gas derivative in the end throttle part, which is a space with a reduced thickness, causes a change in the flow of the molten resin in the thick part near the end throttle part where the gas derivative exists, and the wall thickness is reduced. Movement is given to the gas staying in the thick part to guide the gas derivative into the passage.

  Furthermore, there may be a case where molding is performed in a state in which the staying gas induced in the gas derivative passage remains in the passage, but since the staying gas is not exposed on the surface of the final molded product, it is not possible. The occurrence of meat parts is likewise avoided.

  Thereby, it is avoided that the gas remains on the surface of the seat pad and the molding is avoided, and it is effectively prevented that the thin portion is generated in the seat pad. As a result, a seat pad with high molding accuracy can be obtained.

  The seat pad manufacturing method according to claim 2 is the seat pad manufacturing method according to claim 1, wherein the installation position of the gas derivative in the formation region of the end throttle portion is an actual foaming of the seat pad. It is characterized in that it is positioned close to a location where the residual gas remaining frequency recognized by molding is high.

  In the present invention, the arrangement position of the end portion of the gas derivative in the region where the gas derivative is formed can be set to a single, plural, or arbitrary position. However, a person skilled in the art of manufacturing a seat pad has, from experience, sufficiently recognized a portion where the residual gas remains frequently in the molded product corresponding to the design of the seat pad. Therefore, it is possible to more effectively eliminate the occurrence of the thinned portion by installing the gas derivative at the location in the end throttle portion close to the location with such high frequency as in the configuration of this section. It has become.

  The manufacturing method of the seat pad according to claim 3 is the manufacturing method of the seat pad according to claim 1 or 2, wherein the gas derivative is installed in the formation region of the end throttle part of the end throttle part. It was installed so that it might extend over a front-end | tip part from a base end part.

  According to this configuration, it is possible to more effectively achieve the induction of the staying gas from the region where the thick portion near the end throttle portion where the staying gas is likely to remain to the internal passage of the gas derivative.

  The seat pad manufacturing method according to claim 4 is the seat pad manufacturing method according to any one of claims 1 to 3, wherein the gas derivative is formed in a hollow cylindrical shape. According to this configuration, the configuration of the passage inside the gas derivative is obtained by a simple hollow cylindrical form, and the gas in the molding space can be effectively guided to the mold dividing portion with a simple configuration. .

  The method for manufacturing a seat pad according to claim 5 includes the step of disposing a reinforcing material on at least one outer surface of the seat pad according to any one of claims 1 to 4. The gas derivative is installed by bending the reinforcing material at a location located in a molding region of the end restricting portion of the reinforcing material to form a loop-shaped portion.

  Generally, a reinforcing material is stretched on the outer surface of one side of the seat pad, for example, the back surface side of the back surface of the seat back pad or the back surface side of the seat surface of the seat cushion. According to this configuration, the reinforcing material is used. Thus, a gas derivative is formed. That is, the reinforcing material located at the end throttle portion is bent into a loop shape to form a gas derivative, or a loop-shaped portion is formed of the same material as the stretched reinforcing material, and the reinforcing material is It can comprise by arrange | positioning in a corresponding location. Thereby, the installation of the gas derivative can be facilitated and the manufacturing cost can be suppressed.

  The seat pad according to claim 6 is a seat pad that is foam-molded while allowing discharge of staying gas in the mold from the mold dividing portion in a mold that forms a molding surface by a plurality of mold constituent members. A narrowed end throttle part along the part, the end throttle part has a tip part molded in a molding region where a mold split part in the foam molding die exists, A gas derivative having a passage through which the staying gas can pass is disposed in a region where the end throttle portion is formed so that the staying gas guided in the passage is directed toward the mold dividing portion. It is characterized by being foam-molded in a state.

  According to the configuration of this seat pad, the seat pad is completed in a state in which the staying gas in the thick portion near the end throttle portion is accurately removed by the action of the gas derivative in the foam molding process. That is, at the time of foam molding, the stagnant gas is guided from the thick part side through the passage of the gas derivative to the mold dividing part and discharged, and in the thick part near the end throttle part due to the presence of the gas derivative. Due to the change in the flow state of the foamable resin material, the gas staying in the thick portion moves, and is induced to discharge the gas derivative from the passage. As a result, the seat pad has a good molding accuracy with no lacking portion on the surface.

  A seat pad according to a seventh aspect is the seat pad according to the sixth aspect, wherein the pad main body portion extends outward from the pad main body portion and keeps a space between the pad main body portion and the pad main body portion. A flange portion having a wall thickness portion that is bent and extends in the center direction, and an end throttle portion that extends further in the center direction from the wall thickness portion and decreases in thickness toward the edge portion. It is characterized by having.

  It has a flange portion wound on one side (back side) of the pad main body portion as in the present invention, and this flange portion protrudes with a reduced thickness from the thick portion to the end throttle portion. Especially in the seat pad which has, the poor flowability state of the foamable resin material in the molding process is likely to occur in the vicinity of the end throttle portion. Therefore, the seat pad according to the present invention, which is completed by removing the stagnant gas from the thick part in the vicinity of the end throttle part, is a seat pad with high molding accuracy.

  The seat pad according to claim 8 is the seat pad according to claim 6 or 7, further comprising a cloth reinforcing material disposed on inner surfaces of the pad main body portion and the flange portion, and the gas derivative. Is characterized in that it is installed by bending the reinforcing material at a location located in the molding region of the end restrictor of the reinforcing material to form a loop-shaped portion. According to this configuration, since the gas derivative is configured by the reinforcing material formed by the cloth member on the back surface existing in the past, the flexibility of the portion of the seat pad where the gas derivative is installed is also another portion. And uniform.

  According to the present invention, the gas derivative is installed in the end throttle part, so that the retained gas is guided through the gas derivative, further discharged from the mold dividing part, and the retained gas is retained in the gas derivative. Accordingly, it is possible to eliminate the gas accumulation in the thick portion in the vicinity of the end throttle portion where the retained gas is likely to remain. As a result, it is possible to avoid molding with the gas remaining on the surface of the seat pad, and to effectively prevent the occurrence of a lacking portion on the surface of the seat pad. As a result, obtaining a seat pad with high molding accuracy has been achieved.

It is a schematic explanatory drawing which shows the characteristic process of the manufacturing method of the seat back pad which concerns on embodiment of this invention. The enlarged view of the characteristic component part is shown, The figure (a) shows the state before foaming of a foamable resin material, The figure (b) has shown the state after foaming. It is explanatory drawing which shows the example of the formation method of a gas derivative, The figure (a) shows the example which formed the gas derivative of 2 series, The figure (b) shows the example which comprised one gas derivative, respectively. . It is explanatory drawing which shows the example of the formation method of a gas derivative. It is explanatory drawing which shows the formation method of a gas derivative, The figure (a) shows the positioning and bending state of a cloth member, The figure (b) has shown the sewing method, respectively. It is a schematic sectional drawing which shows the state of the gas derivative after the foam molding in embodiment. It is a schematic sectional drawing which shows the cross-sectional structure of the seat back pad which is a manufacturing object. It is explanatory drawing of installation and an effect | action of a gas derivative in the structure shown in FIG. It is explanatory drawing which shows the example of the installation position of a gas derivative. It is a schematic block diagram of the front seat of the motor vehicle as an example using a seat pad. The structure of the seat back pad as an example is shown, wherein FIG. 4A is an explanatory view seen from the rear, and FIG. 4B is a longitudinal sectional view thereof. It is a figure which shows the example of the shaping | molding die which consists of a some mold structure part for forming a seat pad, The figure (a) shows the state clamped, The figure (b) shows the mold open state, respectively. Yes. It is a figure explaining the outline of the manufacturing method of the conventional seat pad.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the element similar to the structural member described in the said FIGS. 11 and 12, and the description is abbreviate | omitted about the same manufacturing process. Further, in the embodiment of the present invention, the case of manufacturing the seat back pad of the seat back portion of the front seat of the automobile among the seat pads will be described as an example, but the method of the present invention is other than the manufacture of the seat back pad. Of course, it is applied to a seat pad.

  FIG. 1 is a diagram showing characteristic steps in the seat pad manufacturing method according to the present invention, which uses a molding die similar to the molding die shown in FIG. 13, and is the same as the molding die shown in FIG. 12 (a). A state where 20 is clamped is shown. In the present embodiment, the molding process that is not specifically described is the same as each known process.

  In the situation shown in FIG. 1, the step of stretching the reinforcing material 111 on the surface of the core die 26 has already been performed, and the molding surface of each die is separated in advance as in the normal molding step. The mold material is applied, and the foamed resin material M is supplied to the outer side molding surface 22a of the lower mold 22 on the mold material. Similar to the mold shown in FIG. 13, the above-described mold dividing portion PL capable of discharging the staying gas to the outside is located at the tip of the flange cavity portion 30a.

  Here, the characteristic matter in the present invention is that the gas is applied to the tip portion of the flange cavity portion 30a, that is, the portion where the upper end throttle portion 116b at the tip of the upper thick portion 116a of the seat back pad to be formed is formed. That is, the derivative 12 is installed.

  The gas derivative 12 has a passage through which the staying gas can pass, and is installed so that the staying gas guided through the passage is directed toward the mold dividing part PL. As described above, the mold dividing portion PL exists in the formation surface region constituting the flange cavity portion 30a, and the gas derivative 12 is present in the region where the upper end narrowed portion 116b reaching the mold dividing portion PL is formed. It will be installed. In addition, the distance between the gas discharge side end of the gas derivative 12 and the mold dividing part PL is preferably within about 15 mm, and more preferably within 5 mm.

  As long as this gas derivative 12 has a passage inside, it is possible to use various materials and various shapes. For example, a cylindrical body is formed from a cloth material, and this is installed. It is also possible to install the fibrous material in the form of a rod and allow the gap between the fibers to function as a gas guiding passage.

  FIG. 2 shows an enlarged view of a portion where the gas derivative 12 is installed. FIG. 2A shows a state before foaming of the foamable resin material M, and FIG. 2B shows an action in the foamed state. FIG. As shown in the figure, the gas derivative 12 is a region in which the upper end narrowed portion 116b at the corner of the flange cavity portion 30a of the mold is formed, and the reinforcing material 111 disposed on the surface of the core die 26. It is provided above. In the present embodiment, the gas derivative 12 is installed in a range slightly longer than the width of the upper end throttle portion 116b, that is, the one end portion 12a slightly protrudes into the region where the upper thick portion 116a is formed. The end portion 12b extends to a position close to the core mold 26.

  With this configuration, it is possible to more effectively achieve the retention gas G from the upper wall portion 116a in the vicinity of the upper end throttle portion 116b where the retention gas is likely to remain to the internal passage of the gas derivative 12. That is, due to the presence of the gas derivative 12, the gas G staying in the molding region is guided to the mold dividing part PL side along the passage in the gas derivative 12 or along the gas derivative 12, and is discharged through the mold dividing part PL. Is done.

  This means that the gas accumulation in the molding region of the upper thick portion 116a in the vicinity of the upper end narrowed portion 116b where the staying gas G tends to remain is eliminated. At the time of foam molding, the stagnant gas G flows from the upper thick part 116a side through the passage in the gas derivative 12 and is guided to the mold dividing part PL, and the upper end narrowed part 116b which is a narrow space By installing the gas derivative 12 at the position where it is formed, a change occurs in the flow of the foamable resin material in the upper thick portion 116a formation region in the vicinity of the upper end throttle portion 116b, that is, what is a normal flow? Since different turbulent flows, changes in the flow speed, and the like occur, the gas G staying in the upper thick portion 116a is moved to guide the gas derivative 12 to the passage. The staying gas G not only passes through the passage of the gas derivative 12 but also passes along the outer surface of the gas derivative 12.

  Further, there is a state in which the molding is performed with the staying gas G remaining in the passage in the gas derivative 12. By such various phenomena, it is possible to prevent the lacking portion from appearing on the surface of the final molded product, that is, the surface of the upper thick portion 116a. Even in actual trial production, the thinned portion is almost certainly eliminated by the manufacturing method in which the gas derivative 12 according to the present invention is installed, and a seat pad with high molding accuracy is obtained.

  3 to 5 show a preferred method for forming the gas derivative 12. FIGS. 3A and 3B show an example in which a cloth member made of the same material as that of the reinforcing material 111 is used. For example, the cloth material 11 cut into a tape having a width of several centimeters is bent. The gas derivative 12 is formed by forming a loop-shaped portion. In FIG. 6A, two gas derivatives 12-1 and 12-2 are formed by forming two loops. FIG. 4B shows a case where one gas derivative 12 is formed in one loop.

  The cloth material 11 on which such a gas derivative 12 is formed can be separately installed by various methods such as pasting or stitching the cloth material 11 to a predetermined position of the reinforcing member 111 where the upper end narrowed portion 116b is formed. It is also possible to directly form a loop-like portion at the corresponding edge of the upper end restricting portion 116b of the integral reinforcing member 111.

  FIG. 4 is a diagram showing an example of a method for forming the gas derivative 12 shown in FIG. 3, and four positioning holes 13-1 to 13-4 are formed in the tape-like cloth material 11 in advance. As shown in the figure, the positioning holes 13-1 to 13-4 are set to be slightly wider between the positioning holes 13-1 and 13-2 and between 13-3 and 13-4 (as will be described later). A loop-shaped portion is formed between them.

  FIGS. 5A and 5B show a process of forming a loop portion (gas derivative 12) using the cloth material 11 of FIG. As shown in FIG. 5A, first, the cloth material 11 is bent into a wave shape while aligning the positions of the four positioning holes 13-1 to 13-4. That is, it is curved while creating two peaks so that two loop-shaped gas derivatives 12 are formed. Then, in this positioned state, sewing is performed along the sewing line L as shown in FIG. 4B to form two loop-shaped parts (gas derivatives 12-1 and 12-2). In the present embodiment, the height of the loop-shaped portion is set to about 20 mm. That is, the size of the loop-shaped portion can be adjusted by adjusting the arrangement relationship of the positioning holes 13. In this way, by forming a plurality of loop-shaped gas derivatives 12, it is possible to suppress the collapse and deformation of at least some of the loops and more reliably exhibit the function of gas induction.

  FIG. 6 shows the upper end throttle portion in a state where the gas derivative 12 according to the above-described embodiment is actually installed on the reinforcing material 111 stretched on the core mold 26 and the foam formation of the seat pad is finished. A schematic longitudinal section of the portion 116b is shown. As shown in the drawing, the molding is completed in a state where the foamable resin has entered the gas derivatives 12-1 and 12-2. Although not shown in the drawing, the staying gas that causes the lacking part on the surface of the thick part is discharged from the gas derivative 12 to the mold dividing part PL, and is formed while being held in the gas derivative 12. Residual gas remaining on the surface of the thick portion, which causes the occurrence of the lacking portion, is eliminated. Therefore, the completed seat pad is a seat pad having a good molding accuracy with no lacking portion on the surface.

  Further, as in the present embodiment, the gas derivative 12 is configured by the reinforcing material 111 formed by the cloth member on the back surface side of the seat pad that has been conventionally installed, so that FIG. Even if the gas derivative 12 remains in the state as shown in FIG. 5, the flexibility of the seat pad at that portion does not change from that at other portions.

  Next, FIG. 7 is a cross-sectional view taken along the line II-II of the seat back pad 110 shown in FIG. 13A. As shown in the figure, the thickness of the side flange 118 of the seat back pad 110 is also reduced. Since the side end throttle portion 118b is present, it is necessary to prevent the occurrence of a lacking portion due to gas accumulation in the side thick portion 118a in the vicinity of the side end throttle portion 118b. Similarly, an embodiment in which a gas derivative 12 is installed is shown.

  As shown in the figure, in the present embodiment, the gas derivative 12 is installed in the side end throttle portion 118b on the right side in the drawing. The configuration and installation method of the gas derivative 12 are the same as those described with reference to FIGS.

  FIG. 8 is a schematic enlarged view of a portion where the gas derivative 12 is installed in the side end narrowing portion 118b. In the mold formed by the formation surfaces of the upper mold 24 and the core mold 26 (the mold dividing section PL is In the located region), the side thick portion 118a and the side end narrowed portion 118b are formed. As shown in the drawing, the gas derivative 12 is installed in the side end throttle portion 118b that exists further in the distal direction of the side thick portion 118a.

  Due to the presence of the gas derivative 12, the staying gas G pushed by the foamable resin material M that is foamed and flows flows to the gas derivative 12 side and enters the internal passage of the gas derivative 12. 12 flows to the mold division part PL side and is discharged. Further, it stays in the gas derivative 12 as it is to finish the molding, and it is avoided that a thin portion is generated by the residual gas in the side thick portion 118a in the vicinity of the side end throttle portion 118b. Note that the action of the staying gas G being moved without remaining in the side thick part 118a is the same as that described in the embodiment of FIG.

  FIG. 9 is a seat pad (seat back pad 110) manufactured by the method of the present invention, and the arrangement position of the derivative 12 in the end diaphragm portion is indicated by a broken line. In the present embodiment, for example, the upper end throttle part 116b and the side end part throttle part 118b formed continuously along the edge of the upper flange 116 and the side flange 118 of the seat back pad 110. It is installed in multiple places. The installation position of the gas derivative 12 is preferably a place recognized by a person skilled in the art of manufacturing a seat pad as a place where the occurrence of a lacking portion is a high rule of thumb. In other words, there is a tendency for a portion where a thin portion is likely to occur in the molded product corresponding to the design of the seat pad, so by installing the gas derivative 12 at that location, it is possible to more effectively eliminate stagnant gas. Can be performed. For example, as shown in FIG. 9, a side wall thickened portion 118a in the vicinity of the side end narrowed portion 118b in the portion where the opening 126 exists is empirically found to have a thinned portion. It is preferable to arrange them with priority. Specifically, it is preferably within 30 mm from the side thick part 118a.

  The installation position of the gas derivative 12 is not limited to such an arrangement, and any position such as a single place, a plurality of places, and installation at predetermined intervals is possible.

  In addition, this invention is not limited to the structure as described in each said embodiment, A various deformation | transformation is possible within the range of the summary of invention. For example, the seat pad subject to the method of the present invention is not limited to the seat pad of the front seat of an automobile, but the seat back pad of the seat back part of the rear seat of the automobile, and further, an aircraft, a ship, a train A seat pad such as

  Further, in the above-described embodiment and each drawing, the sheet pad has been described as an example in which the thickness decreases relatively steeply from the thick portion and shifts to the end throttle portion, but the thickness gradually increases from the thick portion. The present invention can also be applied to a seat pad that decreases and gradually moves to the end diaphragm portion.

  Further, as the material of the gas derivative 12, a fibrous material such as cloth is exemplified, but a resin material simply formed into a hollow cylinder may be used. It is also possible to use a porous member that allows gas to pass through, such as a sponge.

DESCRIPTION OF SYMBOLS 11 Cloth member 12 Gas derivative 13 Positioning hole 20 Foaming mold 22 Lower mold 24 Upper mold 24a Upper mold extending part 26 Core mold 26a Core mold extending part PL Mold dividing part 111 Reinforcing material 116a Upper thick part 116b Upper part End throttle part 118a Side thick part 118b Side end throttle part M Expandable resin material G Residual gas

Claims (8)

Using a molding die that forms a molding surface with a plurality of mold constituent members, the sheet pad formed with a narrowed end portion along the end edge portion, and a retained gas mold dividing portion in the molding die In the manufacturing method of the seat pad that performs foam molding while allowing discharge from
The molding position of the tip portion of the end drawing portion is set in a molding region where the mold dividing portion of the foam mold is present,
A gas derivative having a passage through which the staying gas can pass is disposed in a region where the end throttle portion is formed so that the staying gas guided in the passage is directed toward the mold dividing portion. A gas derivative installation step,
A method of manufacturing a seat pad, comprising performing a foam molding step after the gas derivative installation step. The installation position of the gas derivative in the molding region of the end throttle is as follows:
The seat pad manufacturing method according to claim 1, wherein the seat pad is positioned close to a location where the residual gas has a high residual frequency, which is recognized by actual foam molding of the seat pad. Installation of the gas derivative in the molding region of the end throttle portion is as follows:
The seat pad manufacturing method according to claim 1, wherein the seat pad is installed so as to extend from a proximal end portion of the end throttle portion to a distal end portion.   The method of manufacturing a seat pad according to any one of claims 1 to 3, wherein the gas derivative is formed in a hollow cylindrical shape. A step of disposing a reinforcing material on at least one outer surface of the seat pad;
5. The gas derivative according to claim 4, wherein the gas derivative is installed by bending the reinforcing material at a position located in a molding region of the end throttle portion of the reinforcing material to form a loop-shaped portion. Manufacturing method for seat pad. In a mold that forms a molding surface with a plurality of mold constituent members, in a seat pad that is foam-molded while allowing discharge of staying gas in the mold from the mold dividing part,
Having a narrowed end throttle along the edge,
The end drawing portion has a tip portion that is molded in a molding region where a mold dividing portion in the foam mold is present,
A gas derivative having a passage through which the staying gas can pass is disposed in a region where the end throttle portion is formed so that the staying gas guided in the passage is directed toward the mold dividing portion. The seat pad is characterized by being foam-molded in a state of being. The pad body,
A thick part that extends outward from the pad main body part and is bent and extends in the center direction of the pad main body part while maintaining a space between the pad main body part and the center from the thick part. A flange portion having an end throttle portion that extends in the direction and decreases in thickness toward the edge portion;
The seat pad according to claim 6, further comprising: A cloth reinforcing material disposed on the inner surface of the pad main body and the flange,
8. The gas derivative is installed by forming a loop portion by bending the reinforcing material at a location located in a molding region of the end throttle portion of the reinforcing material. The seat pad described in 1.

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