JP2007098776A - Mold for seat pad and method for manufacturing the seat pad - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce occurrence of underfill around linear members in molding a seat pad embedding and integrating linear members e.g. wire and frames, by improving the liquid flowing of a foaming raw material into clearances between linear members and the upper mold above the linear members. <P>SOLUTION: A mold for the seat pad has a lower mold 32 forming the front surface 10b side of the pad 10, an upper mold 34 forming the back surface 10a side and a fixing section 38 holding a linear member 12 along the molding face 34a of the upper mold. With the linear member 12 held in the fixing section 38, a foaming raw material U is injected into the mold to foam and fill in order to form a seat pad 10 with the linear member 12 embedded along the back surface 10a of the pad in an integrated form. In the formation of the seat pad 10, two or more recessed grooves 42 extending across the linear member 12 are formed in the longitudinal direction of the linear member 12 on the molding face 34a of the upper mold above the linear member 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a molding die for foam-molding a seat pad mainly used for a vehicle seat and a method for producing a seat pad using the same.

  For example, automobile seats are configured by covering a sheet pad made of a foamed product of a synthetic resin having elasticity such as a flexible polyurethane foam with a skin made of woven or knitted fabric or leather. In such a pad for a sheet, a wire member such as a metal wire or a frame may be embedded for the purpose of attaching the skin to the pad surface, attaching the pad to the vehicle body, and securing (reinforcing) the outer shape of the pad. Yes (see Patent Documents 1 and 2 below).

  FIG. 9 shows an example of this, and a linear member 12 such as a wire is embedded and integrated along the back surface of the sheet pad 10 made of a foamed synthetic resin. This linear member 12 is for sticking the skin 14 to the pad surface, and by locking an engaging member (not shown) attached to the end of the skin 12 on the back side of the pad 10, The epidermis 12 is attached to the surface of the pad 10.

By the way, this type of sheet pad generally uses a molding die having a lower die for molding the pad surface side and an upper die for molding the pad back side, and injects the foaming raw material into the molding die. And then molded by foam filling. At this time, the linear member is embedded along the back surface of the pad so as to be integrated by attaching the linear member along the molding surface of the upper mold in the molding die.
JP 2000-6169 A JP-A-8-322673

  When the linear member is mounted along the molding surface of the upper mold as described above, the flow of the foaming raw material that is foam-filled in the molding die is obstructed by the linear member, and close to the linear member and its upper part. It becomes difficult for the foaming raw material to enter the gap between the upper mold and the upper mold. For this reason, as shown in FIGS. 10 and 11, the thin member 100 may be generated and the linear member 12 may be exposed. When such a lack 100 is increased or a lack range is widened, there is a problem that the linear member 12 is lifted from or detached from the pad body when the skin or the vehicle body is locked.

  In order to solve such a problem, for example, it is conceivable to provide a vent hole in the upper mold. However, in the vent hole, it is necessary to remove the foam waste clogged in the hole after molding. Providing the circular vent hole is not sufficient for improving the liquid flow of the foaming raw material with respect to the gap above the linear member.

  The present invention has been made in view of the above points, and in forming a pad for a sheet in which a linear member such as a wire or a frame is embedded and integrated, the gap between the linear member and the upper mold above the linear member is formed. The object is to improve the liquid flow of the foaming raw material and reduce the occurrence of the lack of thickness around the linear member.

  The sheet pad molding die of the present invention includes a lower mold for molding the front surface side of the pad, an upper mold for molding the back surface side of the pad, and a linear member along the molding surface of the upper mold in the molding die. And holding the linear member in the fixed portion, and injecting the foaming raw material into the mold and filling the foam with the foamed portion, the wire along the back surface of the pad. In a molding die for molding a pad for a sheet in which a linear member is embedded and integrated, a concave groove extending across the linear member is formed on the molding surface of the upper mold above the linear member. A plurality of members are arranged in the longitudinal direction of the member.

  In the sheet pad manufacturing method of the present invention, the linear member is held by the fixing portion in the molding die using the molding die, and then the foaming raw material is injected into the molding die to be foam-filled. Thus, the sheet pad in which the linear member is embedded and integrated along the back surface of the pad is formed.

  According to the present invention, since the concave groove extending across the linear member is provided on the upper mold forming surface above the linear member, the foaming raw material that foams in the mold is the linear member and the upper mold. Since the liquid flow of the foaming raw material around the linear member can be improved, the occurrence of lacking in the vicinity of the linear member is reduced. Further, since the concave groove also serves as an escape portion for air remaining in the mold, the lack of the pad main body is reduced from this point.

  Further, by providing a plurality of such grooves in the longitudinal direction of the linear member, it is possible to reduce the lack of thickness without changing the assembly position on the vehicle. That is, instead of providing such a concave groove, the lack of thickness can be reduced by increasing the overall gap between the linear member and the upper mold, but in this case, the pad thickness below the linear member is reduced. The pad surface is increased by the increased thickness when it is assembled to the vehicle. On the other hand, if it is a narrow groove like this invention, the pad surface height at the time of vehicle assembly will hardly be changed by the protrusion formed by it. In addition, if such concave grooves are arranged at an appropriate interval, when the foaming raw material enters the gap between the concave grooves, it becomes a trigger and the surroundings of the liquid of the foaming raw material are also generated around it. Will improve the overall lack of meat.

  Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is an example in which the present invention is applied to the sheet pad 10 shown in FIG. 9 and will be described with reference to FIGS.

  As shown in FIG. 9, the seat pad 10 is a pad used for a seat cushion for supporting a passenger's buttocks in a rear seat of an automobile, and is a three-seater seat cushion pad. The pad 10 for sheet is a metal linear body embedded and integrated along a back body (bottom surface) 10a of a pad main body 11 made of a synthetic resin foam molded body having elasticity such as flexible polyurethane foam. The member 12 is provided. Further, the surface (upper surface) 10b of the pad 10 is covered with an outer skin 14, and the outer skin 14 has an engaging member (not shown) attached to the end thereof by the linear member 12 on the pad rear surface 10a side. The pad 10 is attached by being locked.

  In this embodiment, the linear member 12 is a metal wire (bar-shaped frame), and as shown in FIG. 9, has a frame shape arranged over the entire periphery of the pad 10, and is centered in the vehicle width direction. It is reinforced by two connecting parts 16 at the part.

  As shown in FIG. 1, a molding die 30 for molding the sheet pad 10 is held substantially horizontally and has a concave lower mold 32 that molds the surface 10b side of the pad 10, and the lower mold 32 can be opened and closed. The upper mold 34 is provided to mold the back surface 10 a side of the pad 10, and a cavity 36 as a foaming space is formed between the lower mold 32 and the upper mold 34. The upper die 34 has a fixing portion 38 for holding the linear member 12 along the molding surface (mold inner surface) 34a of the upper die 34 (that is, at a position close to the molding surface 34a) in the cavity 36. Is provided. A plurality of fixing portions 38 are provided on the upper die 34 so as to hold the linear member 12 at a plurality of locations in the longitudinal direction thereof. For example, the fixing portion 38 is formed as a V-shaped engaging portion for positioning the linear member 12. A magnet for adsorbing the linear member 12 can be embedded and configured.

  As shown in FIG. 2, on the molding surface 34a of the upper die 34, a convex portion 40 for molding a skin locking recess 18 (see FIGS. 5 and 6) for hanging and locking the skin 14 on the pad back surface 10a. Is provided. With this convex portion 40, the linear member 12 is shaped so as to be exposed from the pad main body 11 in the skin locking concave portion 18. The convex portions 40 are provided at appropriate intervals at a plurality of locations in the longitudinal direction of the linear member 12.

  As shown in FIGS. 2 to 4, the molding surface 34 a of the upper mold 34 is provided with a concave groove 42 that extends across the linear member 12. The concave groove 42 is a groove extending perpendicularly to the linear member 12, and is formed so as to extend linearly across the linear member 12 on both sides thereof. More specifically, in this example, the concave grooves 42 are formed so that the protrusions 24 formed thereby are formed on the inner side of the downward protruding edge 20 at the front edge of the pad 10 and the center of the back surface 10 a of the pad 10. It is comprised so that it may be provided over between the recessed part 22 to provide (refer FIG. 5).

  Further, as shown in FIG. 4, the concave groove 42 is a U-shaped groove that is concaved upward, and a plurality of the concave grooves 42 are provided at appropriate intervals in the longitudinal direction of the linear member 12. As described above, in the longitudinal direction of the linear member 12, since a plurality of convex portions 40 for forming the skin locking concave portion 18 are provided, the concave groove 42 is formed in the longitudinal direction of the linear member 12. Providing alternately with the convex portions 40 is suitable for preventing the linear member 12 from coming off or floating when the skin 14 is locked.

  Although not particularly limited, for example, when the linear member 12 having a diameter of 4 mm is embedded at a depth E of about 10 mm from the upper mold forming surface 34a, the width A = 3 to 7 mm, the depth The concave grooves 42 having a length B = 3 to 7 mm and a length C = 10 to 50 mm are preferably arranged at a pitch D of about 50 to 100 mm, more preferably about 50 to 70 mm.

  When the sheet pad 10 is manufactured using the molding die having the above configuration, first, the linear member 12 is attached to the upper die 34 by the fixing portion 38 with the molding die 30 opened. Next, a polyurethane stock solution U as a foaming raw material is supplied to the lower mold 32, and the upper mold 34 is placed on the lower mold 32 and the mold is closed (see FIG. 1). Thereby, the polyurethane stock solution U is foam-filled in the cavity 36, and the sheet pad 10 in which the linear member 12 is embedded and integrated along the pad back surface 10a is formed. And after shaping | molding, the pad 10 for sheets is obtained by opening the upper mold | type 34 and removing.

  At the time of foam filling, in this embodiment, since the concave groove 42 that crosses the linear member 12 is provided in the upper mold forming surface 34a as described above, the polyurethane stock solution U that foams the cavity 36 is It becomes easy to enter the gap 44 between the linear member 12 and the upper mold 34, and the liquid flow around the linear member 12 can be improved. That is, since the space above the linear member 12 is increased by providing the concave groove 42, the polyurethane stock solution U thickened by foaming can easily enter the gap 44. In addition, by arranging such concave grooves 42 at appropriate intervals, when the polyurethane stock solution U enters the gap 44 at the locations where the concave grooves 42 are disposed, this becomes a trigger and the periphery of the locations where the concave portions 42 are disposed. However, the circumference of the polyurethane stock solution U is improved. The concave groove 42 also serves as an escape portion for air remaining in the cavity 36. As described above, the lacking range around the linear member 12 is reduced, and the occurrence rate of the lacking is reduced.

  In the thus obtained sheet pad 10, as shown in FIGS. 5 to 8, a plurality of ridges 24 are formed on the back surface 10 a by the concave grooves 42. If so, it will be crushed when assembled on the vehicle body, so the pad surface height at the time of vehicle assembly will hardly be changed, thus reducing the lack of thickness without changing the basic performance of the seat pad 10 Thus, the linear member 12 can be prevented from coming off or floating when the skin 14 is locked. Note that the protrusions 24 do not necessarily have to be completely formed, and even if a lack of thickness occurs in the protrusions 24 due to the air remaining in the cavity 36, the air in the pad main body 11 can be stored in this portion. The lack of meat can be reduced. In addition, if the protrusions 24 are incompletely formed, it is also preferable in that the pad surface height during vehicle assembly is not changed as described above.

  In addition, although the example applied to the seat cushion pad was demonstrated in the said embodiment, this invention is not limited to this, For example, it can also apply to the back pad which comprises a backrest part. Further, the arrangement and shape of the linear members and the shape and arrangement of the concave grooves can be appropriately changed. Further, the structure of the mold can be similarly applied to a so-called three-part mold having a core mold on the upper mold.

It is sectional drawing of the shaping | molding die of the pad for sheets which concerns on embodiment of this invention. It is a principal part expansion perspective view of the upper mold | type of the same shaping | molding die. It is a principal part expanded sectional view of the same shaping | molding die. It is the IV-IV sectional view taken on the line of FIG. It is the partial perspective view seen from the back surface side of the pad for sheets concerning an embodiment. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is a principal part enlarged plan view of the back surface of the pad for sheets. It is the VIII-VIII sectional view taken on the line of FIG. It is a perspective view of the pad for sheets. It is a principal part top view of the back surface of the pad shape | molded by the conventional manufacturing method. It is the XI-XI sectional view taken on the line of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Sheet pad, 10a ... Back surface, 10b ... Front surface, 12 ... Linear member, 30 ... Mold, 32 ... Lower mold, 34 ... Upper mold, 34a ... Molding surface, 38 ... Fixed part, 42 ... Groove , U ... Polyurethane stock solution (foaming raw material)

Claims (2)

A lower mold for molding the front surface side of the pad, an upper mold for molding the back surface side of the pad, and a fixing portion for holding the linear member along the molding surface of the upper mold in the molding mold. The sheet pad in which the linear member is embedded and integrated along the back surface of the pad by injecting a foaming raw material into the mold and filling the foamed material with the linear member held by the fixing portion. In a mold for molding
A mold for forming a pad for a sheet, wherein a plurality of concave grooves extending across the linear member are arranged in the longitudinal direction of the linear member on the molding surface of the upper mold above the linear member. .   Using the molding die according to claim 1, the linear member is held in the molding die by the fixing portion, and then a foaming raw material is injected into the molding die to be foam-filled. A method for producing a sheet pad, comprising forming a sheet pad in which the linear members are embedded and integrated along.

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