JP2603397Y2 - Automotive interior parts - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile interior part such as an automobile door trim, and more particularly to an automobile interior part having excellent rigidity and product appearance.

[0002]

2. Description of the Related Art Normally, various interior parts such as door trims and rear corner trims for automobiles are mounted in the interior of an automobile. In many cases, a skin having a cushioning property and a decorative property is attached to a surface of a core material having rigidity for attachment to a laminated structure.

[0003] As a core material for interior parts, a polyolefin-based composite resin obtained by mixing a wood powder filler or the like with a polypropylene resin or the like is frequently used in view of moldability, cost, and the like. FIG. 8 shows a general structure of a conventional automobile door trim 1. This door trim 1 has a cushion member such as a polyurethane foam on a surface of a core material 2 made of a PP (polypropylene) composite resin material. The core material 2 and the cushion body 3 are satisfactorily joined and fixed because the hot melt film 4 is laminated on one surface of the core material 2.

By the way, in recent years, the door trim 1 for automobiles is often formed into a complicated curved shape due to the molding thereof. It is interposed between. As the material of the reinforcing member 5, a PP composite resin sheet of the same material as the core member 2 is used, or an iron plate or the like formed into a required shape is used.

[0005]

As described above, in the conventional automobile door trim 1, in order to secure the strength of the deep drawing portion, that is, the high deployment ratio portion, the same material as the core material 2 is used.
This is a configuration in which a P composite resin sheet or a reinforcing material 5 such as an iron plate is used. For example, when a PP composite resin sheet of the same material as the core material 2 is used, the thickness of the portion is increased, and It has been pointed out that irregularities occur on the surface, impair the appearance and design of the product, and also require a step of preheating and softening the PP composite resin sheet, thereby lengthening the manufacturing process and increasing the product cost.

Similarly, when an iron plate or the like is attached to the core material 2, the material cost increases, and in addition to the processing cost for forming the iron plate into a required shape, the number of work steps for attaching the iron plate to the core material 2 by mechanical stopping in a post-process is increased. It has been pointed out that such a problem causes a significant increase in cost.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide an inexpensive and high-development portion of a thermoplastic composite resin core material which is thermoformed into a required shape. An object of the present invention is to provide an automobile interior part that can provide a significant cost reduction and a good product appearance by employing an effective reinforcing structure.

[0008]

In order to achieve the above object, the present invention heats and softens a core made of a thermoplastic composite resin sheet with a hot melt, and cold-presses this core and a cushion body. In the interior part for automobiles formed in a required shape by this, a core material (20) is provided between a core material and a cushion body in a high expansion rate portion of the core material.
Characterized in that a mesh made of a high-melting fiber incompatible with the resin component is interposed.

[0009]

[Function] As is clear from the above configuration, as a reinforcing body
By employing a mesh made of a high-melting fiber that is incompatible with the resin component of the core material 20 , the hot melt permeates between the meshes of the mesh and the mesh is made of a softened base material. Since it is embedded inside, strong bonding between the core material and the cushion body can be expected, and the mesh body does not appear as irregularities on the product surface. Further, the use of the mesh body of the high melting point fiber achieves the reinforcing function in the high expansion rate portion of the core material, and also improves the heat resistance.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle interior part according to the present invention;

FIG. 1 is a front view showing an automobile door trim to which the present invention is applied, FIG. 2 is a sectional view showing the structure of the automobile door trim, and FIGS. It is each sectional drawing which shows a press molding process, respectively.

First, in FIGS. 1 and 2, a door trim 10 for an automobile is formed into a required shape, and has a core material 20 having an appropriate shape-retaining property and rigidity for mounting to a vehicle body panel. The cushion body 30 that imparts cushioning properties is press-integrated on the front side, and if desired, the surface side of the cushion body 30 may be integrally covered with a decorative skin material 31.

Further, the door trim 10 for an automobile is usually set such that the armrest portion at the substantially center is bulged toward the interior of the vehicle, so that the core member 20 is set to have a high deployment rate at this portion.

In the present invention, the mesh member 21 of the high melting point fiber is formed along the high expansion rate portion of the core material 20.
It is characterized in that it is interposed between 0 and the cushion body 30.

Therefore, the rigidity is remarkably enhanced by the mesh body 21 of the high melting point fiber, and the heat resistance at this portion is also improved. In comparison, since it is easily buried inside the core material 20, there is an effect that a good product appearance is provided without appearance of unevenness in the product appearance.

Next, based on FIG. 3 and FIG.
The step of pressing the cushion body 30 with the cushion body 30 will be described.

First, as shown in FIG. 3, a PP composite resin sheet S, which is a raw material of the core material 20, is set on a mold surface of a lower mold 40 for cold press molding in a state where the PP composite resin sheet S has been heated and softened to a predetermined temperature in advance.

A hot melt film F is laminated on the surface of the PP composite resin sheet S in consideration of the adhesiveness to the cushion body 30.

Then, a mesh 21 of high-melting-point fibers is inserted in advance in the high expansion rate portion of the PP composite resin sheet S, and a cushion 30 made of polyurethane foam or the like is set from above.

Thereafter, as shown in FIG. 4, the upper die 41 for cold press molding is lowered and the upper and lower dies 40, 41 for cold press molding are engaged and pressed to form the PP composite resin sheet S into a required shape. The core material 20 is obtained by molding, and the cushion body 30 is integrated with one surface side of the core material 20 via the hot melt film F.

In this embodiment, glass mesh, vinylon, cotton cloth,
Soup fiber or natural fiber and a resin impregnated with resin to increase the fiber strength and use a structure with a stiffness. Use a basis weight of 50 to 200 g / m ² and use a mesh of 16 mesh or less. are doing.

At the time of the press molding, the mesh body 21 of the high-melting-point fiber digs into the heat-softened PP composite resin sheet S to maintain the strength of the PP composite resin sheet S at the time of press molding. Since the hot melt film F penetrates between the meshes of the mesh body 21 of the high melting point fiber, good adhesion between the core material 20 and the cushion body 30 can be achieved, and the mesh body 21 is embedded in the PP composite resin sheet S. Also, there is no occurrence of unevenness in the product appearance.

It should be noted that even if slight irregularities occur, they can be absorbed by the cushion 30 made of polyurethane foam or the like.

Finally, although not shown, the cushion body 3
By covering and adhering a skin material 31 having excellent decorative properties to the front side of the vehicle door 0, the automobile door trim 10 shown in FIGS. 1 and 2 is obtained. Thus, the vehicle door trim 10 according to the present invention is provided.
According to the above, the mesh structure 2 of the high melting point fiber is particularly used as a reinforcing structure of the PP composite resin sheet S which is a material in consideration of resource saving.
The inventor has found that the adoption of No. 1 enhances the breaking strength by about 50% as compared with the type not using the mesh body 21.

This is apparent from the results of the measurement of the actual breaking strength (MIN value) shown in Table 1. For this measurement, measurement points 1, 2, and 3 in the right specification front door trim shown in FIG. 5, measurement points 1, 2, and 3 in the left specification front door trim shown in FIG. 6, and measurement points in the left specification rear door trim shown in FIG. Tests 1 and 2 were carried out for a comparative example (conventional product without a patch) and a product of the present invention (glass patch type, vinylon patch type).

[0026]

[Table 1] As is clear from Table 1, in the comparative example, both the front door trim and the rear door trim have low strength in the high deployment rate portion (armrest portion rear end portion) and cannot meet the requirements.

On the other hand, in the product of the present invention, the strength is increased by almost 50%, and the overall evaluation satisfies the market requirements.

As described above, the high melting point fiber mesh 21
According to the reinforcing structure adopting the above, the mechanical strength is improved by about 50%, the rigidity is remarkably enhanced, and particularly, by using the mesh body 21 of the high melting point fiber, the heat resistance is improved, and the thermal deformation is also prevented. The hot melt film F has a mesh structure and does not hinder the adhesiveness of the hot melt film F, and does not appear as irregularities on the product surface by being cut into the PP composite resin sheet S. Has an effect that it can be finished very well.

In this embodiment, the step of pressing the core material 20 and the cushion body 30 and then covering the skin material 31 in a separate step has been described.
If the core material 20 is preliminarily laminated with the skin material 31, the cushion body 30 and the skin material 31 can be integrated with the surface side of the core material 20 when the core material 20 is pressed.

[0030]

As described above, the automotive interior parts according to the present invention have the following special effects.

(1) During cold press molding of a thermoplastic composite resin sheet, a mesh of high melting point fiber such as glass fiber, staple fiber, vinylon fiber or the like is interposed between a core material and a cushion body to perform press integration. With this configuration, there is no breakage or transparency even in the high expansion rate portion of the core material, and sufficient strength is obtained.
Strength is increased by 50%.

(2) Since the reinforcing material is composed of a mesh of high-melting-point fibers, the mesh does not bite into the thermoplastic composite resin sheet, so that it does not appear as irregularities on the product surface, and the hot melt film is adhered. It does not affect the properties, so there is no defect such as floating of the cushion body, good product appearance can be obtained, and since it is a mesh body of high melting point fiber, the heat resistance of this part also improves, and thermal deformation Also has the effect of being able to prevent it beforehand.

[Brief description of the drawings]

FIG. 1 is a front view showing an automobile door trim to which the present invention is applied.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a cross-sectional view showing a press forming step of the automobile door trim shown in FIG. 1 and showing a set state of materials.

FIG. 4 is a cross-sectional view showing a press molding step of the automobile door trim shown in FIG. 1 and showing a state at the time of press molding.

FIG. 5 is a front view of a front door trim of a left-side specification showing measurement points of a breaking strength test.

FIG. 6 is a front view of a right-side specification front door trim showing measurement points in a fracture strength test.

FIG. 7 is a front view of a rear door trim of a left-side specification showing measurement points of a breaking strength test.

FIG. 8 is a sectional view showing a configuration of a conventional automobile door trim.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Automobile door trim 20 Core material 21 Mesh body 30 Cushion body 31 Skin material 40 Lower mold for cold press molding 41 Upper mold for cold press molding SPP composite resin sheet F Hot melt film

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60J 5/00 B60R 13/02

Claims (1)

(57) [Scope of request for utility model registration] A core material (20) made of a thermoplastic composite resin sheet with a hot melt is heated and softened to obtain a core material (2).
0) and the cushion body (30) are formed into a required shape by cold press forming, wherein the core material (20) and the cushion are provided in a high expansion rate portion of the core material (20). Resin component of core material (20) between body (30)
Interior parts for automobiles, wherein a mesh body (21) made of a high-melting fiber incompatible with the above is interposed.