JP6192095B2 - Skin material bonding structure for automotive interior parts - Google Patents

Description

  The present invention relates to a skin material bonding structure in an automotive interior part in which a skin material is pressure-bonded and bonded to the surface of a resin core material with a thermoplastic adhesive and pressing pressure, and in particular, a skin material for a terminal portion of the resin core material By carrying out pasting reinforcement, peeling of the skin material from the terminal portion in this type of automobile interior part is prevented.

  FIG. 4 is a cross-sectional view of a conventional automotive interior part such as a door trim. The conventional automotive interior part PA shown in FIG. 1 has a structure in which a skin material 2 is bonded to the surface of a resin core material 1 with a thermoplastic adhesive and pressing pressure. As an interior part for an automobile having such a structure, for example, a door trim described in Patent Document 1 is known.

  The conventional automotive interior part shown in FIG. 4 can be manufactured by the molding method shown in FIGS.

  That is, when the conventional automotive interior part PA shown in FIG. 4 is manufactured, a pair of molds 10A, 10A, 10B, a pair of molds 10A, 10B shown in FIG. 5B is set relatively close as shown in FIG. 5B to set the molding die 10 in a closed state, and in this state, from the gate G of one die 10A to the cavity 11 of the molding die 10. By injecting the molten resin into the resin core material 1 shown in FIG.

  Then, the pair of molds 10A and 10B are relatively moved away from each other as shown in FIG. 5C, so that the molding die 10 is set in the mold open state, and the resin core as shown in FIG. 5D. The skin material 2 is set on the material 1. At this time, the set skin material 2 is arranged such that an adhesive layer (not shown) made of a thermoplastic adhesive on the back side faces the resin core material 1.

  After the setting work of the skin material 2 is completed as described above, the mold 10 is closed by moving the pair of molds 10A and 10B relatively close to each other as shown in FIG. Set to. As a result, the thermoplastic adhesive in the adhesive layer on the back surface of the skin material 2 is melted by the residual heat of the resin core material 1, and the resin core material 1 is formed by the molten thermoplastic adhesive and the pressing pressure of the molding die 10. And the skin material 2 are pressed and bonded together.

  Thereafter, after a predetermined cooling period, as shown in FIG. 6 (f), the pair of molds 10A and 10B are relatively moved away from each other, and the molding mold 10 is set in the mold open state, thereby forming the resin core. The pressure-bonded product of the material 1 and the skin material 2 can be taken out from the molding die 10 as an automobile interior part PA. The automobile interior part PA taken out from the molding die 10 is cut into the outer periphery of the skin material 2 in a separate process as shown in FIG. 6 (f), becomes a final product, and is attached to the inner surface of the door panel of the vehicle body.

  By the way, the conventional automotive interior part PA manufactured as described above (a pressure-bonded product of the resin core material 1 and the skin material 2) is the vicinity of the terminal portion of the resin core material 1 and the bonding portion of the skin material 2. However, there is a problem that a part of the skin material 2 is peeled off, that is, so-called terminal peeling occurs. The reason is that the molten resin injected from the gate G as shown in FIG. 5B is cooled by the molding die 10 as it flows through the cavity 11, so that the resin core shown in FIG. When crimping 1 and the skin material 2, the surface temperature due to the residual heat of the resin core material 1 is reduced in the vicinity of the terminal portion of the resin core material 1 located far from the gate G. Therefore, the adhesive layer on the back surface of the skin material 2 This is considered to be because the thermoplastic adhesive in can not be sufficiently melted by the residual heat.

Japanese Patent Laid-Open No. 9-95134

  The present invention has been made in order to solve the above-mentioned problems, and its purpose is to provide an automotive interior part in which a skin material is pressure-bonded and bonded to the surface of a resin core material with a thermoplastic adhesive and pressing pressure. An object of the present invention is to provide a skin material bonding structure for automobile interior parts, which is suitable for effectively preventing peeling of the skin material from the terminal portion of the automobile interior parts.

Wherein in order to achieve the object, the present invention provides a skin material laminated structure of automobile interior parts bonded by pressure bonding the skin material to the surface of the resin core member with a thermoplastic adhesive and pressing pressure, the The interior part for automobiles has a flange part on the outer periphery, and the terminal part of the resin core material constituting the flange part has an angle of 5 ° to 45 ° from the back surface to the surface of the resin core material And the inner surface of the automotive interior part is inclined to be inclined, and the thermoplastic adhesive is melted by residual heat at the time of injection molding of the resin core material and the skin material is pressed to the inclined surface. Bonding reinforcement of the said skin material with respect to the terminal part of the said resin core material is performed by crimping | bonding by pressure, It is characterized by the above-mentioned.

  In the present invention, as described above, the terminal portion of the resin core material is located on the inner side of the automobile interior part at an angle of 5 ° to 45 ° from the back surface to the surface of the resin core material. A configuration with an inclined slope was adopted. For this reason, at the time of pressure bonding of the resin core material and the skin material, the press pressure acting on the slope portion is decomposed into a force component parallel to the force component perpendicular to the slope portion, and among these force components, In particular, since the force component perpendicular to the slope portion presses the skin material against the end portion (slope portion) of the resin core material, bonding reinforcement of the skin material to the end portion of the resin core material is performed. Even when the surface temperature due to the residual heat of the resin core material is reduced near the end portion of the resin core material when crimping with the skin material, conventional defects, that is, near the end portion of the resin core material and the skin material In the bonding part, it is possible to effectively prevent a problem that a part of the skin material is peeled off (terminal peeling).

Sectional drawing of the interior component for motor vehicles to which this invention is applied. FIG. 2 is a manufacturing process conceptual diagram showing a manufacturing method of the automobile interior part shown in FIG. 1, wherein (a) in FIG. 2 shows a schematic configuration of a molding die used for the manufacturing, (b ) Shows a mold closing and resin injection step in the molding die, (c) shows a primary mold opening step in the molding die, and (d) shows a skin material setting step in the molding die. FIG. 3 is a manufacturing process conceptual diagram showing a manufacturing method of the automobile interior part shown in FIG. 1, wherein (e) in FIG. 3 shows a crimping / cooling process in the molding die, and (f) is a molding. The secondary mold opening process (product taking-out process) in a metal mold | die is shown. Sectional drawing of the conventional interior part for motor vehicles. FIG. 5 is a manufacturing process conceptual diagram showing a method of manufacturing the conventional automotive interior part shown in FIG. 4, (a) in FIG. 5 shows a schematic configuration of a molding die used for the manufacturing, (B) shows the mold closing and resin injection step in the molding die, (c) shows the primary mold opening step in the molding die, and (d) shows the skin material setting step in the molding die. FIG. 6 is a manufacturing process conceptual diagram showing a method of manufacturing the conventional automotive interior part shown in FIG. 4, wherein (e) in FIG. 6 shows a crimping / cooling process in the molding die, (f) Indicates a secondary mold opening process (product take-out process) in the molding die.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view of an automotive interior part to which the present invention is applied. The automobile interior part PA in FIG. 1 is specifically a door trim mounted on the inside (interior side) of a vehicle door panel, and is a skin material on the surface of the resin core material 1 with a thermoplastic adhesive and pressing pressure. 2 is bonded and bonded together.

  Further, this automobile interior part PA (door trim) has a flange part PA2 extending laterally outward from the vertical wall part PA1 on its outer periphery, and the vertical wall part PA1 and the flange part PA2 are also other than that. Similar to the portion, the structure described above, that is, a structure in which the skin material 2 is pressure-bonded to the surface of the resin core material 1 and bonded together.

  In the automotive interior part PA of FIG. 1, the skin material 2 before being bonded to the resin core material 1 has an adhesive layer (not shown) made of a thermoplastic adhesive on the back side thereof. And the bonding structure of the skin material 2 with respect to the resin core material 1 is specifically the said adhesion | attachment by the residual heat of the resin core material 1 from the time of making the said adhesive layer of the skin material 2 back surface contact the resin core material 1. The thermoplastic adhesive of the layer is melted, and the skin material 2 is pressure-bonded and bonded to the surface of the resin core material 1 with the melted thermoplastic adhesive and pressing pressure.

  As will be described later, the residual heat of the resin core material 1 used for the above-mentioned pressure bonding is that the molten resin softened by heating is injected into the cavity 11 of the molding die 10 and the resin core material 1 is injection molded. It is the heat of the molten resin. Moreover, the press pressure utilized by the said crimping | compression-bonding bonding is a press pressure in the molding die 10 mentioned later.

  Further, in the automobile interior part PA in FIG. 1, the terminal portion of the resin core material 1 (the terminal portion of the resin core material 1 constituting the flange portion PA2 in the example of FIG. 1) is the back surface of the resin core material 1. The slope portion 1A is inclined inwardly of the interior part PA for automobiles at any angle of 5 ° to 45 ° from the surface to the surface, and the skin material 2 is applied to the slope portion 1A by the press pressure. By bonding with, the bonding reinforcement of the skin material 2 to the terminal portion of the resin core material 1 is performed.

  As the thermoplastic adhesive constituting the adhesive layer on the back surface of the skin material 2, for example, an olefin hot melt adhesive (PP, PPC, etc.) having a melting temperature of 100 ° C. to 160 ° C. can be employed. It is not limited to this.

  2 and 3 are manufacturing process conceptual diagrams showing a manufacturing method of the automobile interior part shown in FIG. 1, and (a) in FIG. 2 shows a schematic configuration of a molding die used for the manufacturing. (B) shows the mold closing and resin injection process in the molding die, (c) shows the primary mold opening process in the molding die, and (d) shows the skin material setting process in the molding die. Further, (e) in FIG. 3 shows a pressure bonding / cooling process in the molding die, and (f) shows a secondary mold opening process (product taking-out process) in the molding die.

  The molding die 10 includes a pair of upper and lower dies 10A and 10B, and the upper die 10B is formed with irregularities 11B on the mold surface in accordance with the surface shape of the automotive interior part PA. Concavities and convexities 11A are formed on the mold surface of the side mold 10A in accordance with the shape of the back surface of the automotive interior part PA. Then, by bringing the pair of molds 10A and 10B relatively close to each other as shown in FIG. 2 (b) by a driving device (not shown), the molding mold 10 is set in a mold-closed state and its mold alignment is performed. In the vicinity of the surface, a cavity 11 having a required shape is formed by the irregularities 11A and 11B. Further, in this molding die 10, the outermost peripheral edge of the unevenness 11A formed on the mold surface of the upper mold 10B is a slope so that the terminal portion of the resin core material 1 is the slope portion 1A described above. The mold slope portion 12 has a shape corresponding to the portion 1A.

  When the automobile interior part PA shown in FIG. 1 is manufactured by the manufacturing method of FIGS. 2 to 3, the molding die 10 of FIG. 2 (a) adjusted to a temperature of 20 ° C. to 80 ° C. is used. Is set in a closed state as shown in FIG.

  When the closing of the molding die 10 is completed, a molten resin of, for example, 190 ° C. to 240 ° C. is injected from the gate G of one mold 10A toward the cavity 11 as shown in FIG. The resin core material 1 (see FIG. 2C) is injection molded. The terminal part of the injection-molded resin core material 1 is inclined at an angle of 5 ° to 45 ° with respect to the thickness direction of the resin core material 1 by the mold slope portion 12 of the mold 10B described above. It is formed as a slope 1A (see FIG. 3 (e)). By the way, when the resin core material 1 is completed by this injection molding, heat from the resin melting remains as residual heat in the resin core material 1. The temperature of such residual heat is, for example, 80 ° C to 150 ° C.

  When the injection molding of the resin core material 1 is completed as described above, the pair of molds 10A and 10B are moved away from each other by a predetermined amount as shown in FIG. And the skin material 2 is set on the resin core material 1 as shown in FIG. At this time, the set skin material 2 is arranged such that an adhesive layer (not shown) made of a thermoplastic adhesive on the back side faces the resin core material 1.

  When the setting work of the skin material 2 is completed as described above, the pair of molds 10A, 10B are relatively brought close to each other as shown in FIG. . Accordingly, the thermoplastic adhesive in the adhesive layer on the back surface of the skin material 2 is melted by the residual heat of the resin core material 1, and the molten thermoplastic adhesive and the pressing pressure P of the molding die 10 cause the resin core material 1. And the skin material 2 are pressed and bonded together.

  Referring to FIG. 3 (e), the end portion of the resin core material 1 is located on the inner side of the automobile interior part PA at an angle of 5 ° to 45 ° from the back surface to the surface of the resin core material 1. The slope portion 1A is inclined. For this reason, when the resin core material 1 and the skin material 2 are pressure-bonded as described above, the press pressure P acting on the slope portion 1A is decomposed into a force component P2 parallel to the force component P1 perpendicular to the slope portion 1A. Is done. Among these force components P1 and P2, in particular, the force component P1 perpendicular to the inclined surface portion 1A presses the skin material 2 against the end portion (inclined surface portion 1A) of the resin core material 1, whereby the end portion of the resin core material 1 is obtained. Bonding reinforcement of the skin material 2 is performed. Therefore, when the resin core material 1 and the skin material 2 are pressure-bonded, even if the surface temperature due to the residual heat of the resin core material 1 is reduced in the vicinity of the end portion of the resin core material 1, In the vicinity of the terminal portion of the resin core material 1 and the bonding portion of the skin material 2, a problem that a part of the skin material 2 is peeled off (terminal peeling) hardly occurs.

  By the way, when the inclination angle of the slope portion 1A (terminal portion) of the resin core material 1 is less than 5 °, the force component P1 perpendicular to the slope portion 1A becomes too small, and a part of the skin material 2 is peeled off. Conventional defects cannot be effectively prevented. On the other hand, if the inclination angle of the inclined surface portion 1A of the resin core material 1 exceeds 45 °, the end portion (inclined surface portion 1A) of the resin core material 1 becomes too acute, resulting in insufficient strength. For these reasons, the inclination angle of the slope portion 1A of the resin core material 1 is limited to the range of 5 ° to 45 ° as described above.

  After the pressure bonding of the resin core material 1 and the skin material 2 is completed as described above, a pair of molds 10A and 10B are relatively moved with a predetermined cooling period as shown in FIG. When the molding die 10 is set in an open state, the pressure bonded product of the resin core material 1 and the skin material 2 can be taken out from the molding die 10 as an automobile interior part.

  The automotive interior part PA taken out from the molding die 10 is cut into the outer periphery of the skin material 2 in a separate process as shown in FIG. 3 (f), becomes a final product, and is attached to the inner surface of the door panel of the vehicle body. At this time, for example, in the automobile interior part PA shown in FIG. 4 manufactured by the conventional manufacturing method shown in FIGS. 5 and 6, when viewed from the side, the skin material 2 shown in FIG. The laminated structure of the skin material 2 and the resin core material 1 can be seen in the cut by the outer periphery cut, and the appearance is poor. On the other hand, in the automobile interior part PA of FIG. 1 manufactured by the manufacturing method of the present embodiment shown in FIGS. 2 and 3, the skin shown in FIG. 3 (f) when viewed from the side. The laminated structure of the skin material 2 and the resin core material 1 cannot be seen in the cut surface formed by cutting the outer periphery of the material 2, and the skin material 2 crimped onto the slope portion 1A can be seen.

1 Resin Core Material 1A Slope (resin core end)
2 Skin material 10 Mold 10A, 10B A pair of molds 11 Cavity 11A, 11B Concavity and convexity 12 Mold slope PA Automotive interior parts (for example, door trim)
PA1 Longitudinal wall PA2 Flange G Gate P Pressing pressure P1 of molding die Force component perpendicular to the slope of the resin core P2 Force component parallel to the slope of the resin core

Claims (1)

A skin material bonding structure for interior parts for automobiles, in which a skin material is pressed and bonded to the surface of a resin core material with a thermoplastic adhesive and pressing pressure,
The automotive interior part has a flange portion on its outer periphery,
The end portion of the resin core material constituting the flange portion is an inclined surface inclined inward of the automobile interior part at an angle of 5 ° to 45 ° from the back surface to the surface of the resin core material. And the thermoplastic adhesive is melted by the residual heat during the injection molding of the resin core material, and the skin material is pressure-bonded to the inclined surface portion by the press pressure to the terminal portion of the resin core material. A skin material bonding structure for interior parts for automobiles, wherein the skin material is reinforced for bonding.

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