JPH04307210A - Manufacture of internal trim part for automobile - Google Patents

Abstract

PURPOSE:To shorten a process while quickening a time up to press working after the heating process of a base material, and to improve the moldability of the base material and adhesive strength between the base material and a skin material by delaying the cooling of the base material in the manufacture of an internal trim part for an automobile, in which the skin material is stuck on the base material composed of a low-density cellulose mat though wet type paper making and the surface side of the base material and a nonwoven fabric for an adhesive medium is stuck on the rear side of the base material. CONSTITUTION:A time up to press working after the raw fabric M of a base material 11 is heated is quickened by superposing the raw fabric M and a nonwoven fabric 13 for an adhesive medium and heating unifying the raw fabric and nonwoven fabric by not plates 20, 21 when the fabric M is heated, and the heat dissipation of the raw fabric M is inhibited by the heat-insulating action of the non-woven fabric 13 for the previously unified adhevie medium, and the moldability of the base material 11 is improved while the mutual adhesive strength of the base material 11, a skin material 12 and the nonwoven fabric 13 for the adhesive medium is increased.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing interior parts for automobiles using a cellulose-based low-density mat formed by wet paper forming as a base material.

0002

[Prior Art] The general structure of interior parts for automobile body panels is to cover the surface of a base material with shape retention and appropriate rigidity with a skin material with excellent decorative properties and surface feel as desired. Generally, a laminated structure is used in which the laminated structure is integrated with a pad material such as urethane foam interposed therebetween.

[0003] In addition to rigidity, the base material is preferably lightweight and inexpensive since the interior parts are mass-produced.

[0004] As a material that satisfies these requirements, there is a cellulose-based low-density mat formed into a sheet by wet paper-making using recycled paper and thermoplastic resin as raw materials. After this mat is heated, it is molded into a product shape using a cold press mold having a desired shape.

[0005] Also, to attach interior parts to a car body panel, a clip is press-fitted into a mounting hole in the car body panel, but with recent improvements in quality, it has become necessary to prevent the head of the clip from being exposed on the product surface. Recently, a configuration in which a clip mounting seat is integrated on the back side of an interior component, a clip is attached to the clip mounting seat, and is press-fitted to a vehicle body panel has been widely adopted.

[0006] In order to ensure the adhesive strength between the base material and the clip attachment seat, a nonwoven fabric for adhesive medium such as a nonwoven polyester fabric is usually adhered to the back surface of the base material.

[0007] The manufacturing process of the automobile interior parts constructed as described above will be explained based on the chart diagram of FIG. 6 and the drawings of FIGS. 7 to 9. An original mat fabric 1 is compressed and heated between hot plates 2. At this time, the temperature of the hot plate is 200-22
It is heated to around 0°C.

Thereafter, as shown in FIG. 8, the skin material 3 is set on a cold press lower mold 4, and the original fabric 1 heated and softened in the above process is set from above.

[0009] At this time, the skin material 3 has its periphery aligned with the lower mold 4.
It is held by fixing pins 5 provided along the outer periphery of the holder, and a moderate amount of tension is applied thereto.

[0010] Next, the nonwoven fabric 6 for adhesive medium is set on the original fabric 1 by sticking its peripheral edge into the fixing pin 5 to apply tension, and then the cold press upper die 7
is lowered to remove the skin material 3, the base material 1, and the nonwoven fabric for adhesive medium 6.
The three parts are integrated and molded into the desired shape to complete the production of the interior parts.

[0011]

[Problems to be Solved by the Invention] As described above, in the conventional manufacturing method for interior parts, there is a step of heating the original fabric of the base material 1, and a step of heating the base material 1, the skin material 3,
A setting process for each of the adhesive medium nonwoven fabrics 6 is required, and the number of processes is large, resulting in an increase in product cost.

Furthermore, if the setting and pressing are not completed within ten seconds from the end of the heating process of the base material 1 to the pressing process, the base material 1 will cool and the nonwoven fabric 3,
6, and cracks are likely to occur in the base material 1, which is a major cause of product defects.

[0013] Therefore, in order to set within ten seconds,
The reality is that the set is not done by one person, but by multiple workers.

The present invention has been made in view of the above circumstances, and an object of the present invention is to use a cellulose-based low-density mat formed by wet papermaking as a base material, and to improve the surface of the base material. In the manufacturing method of automobile interior parts in which a nonwoven fabric is integrally attached to the back side, the process can be shortened, the setting work can be completed in a short time even by a single operator, and the gap between the base material and the nonwoven fabric can be shortened. An object of the present invention is to provide a manufacturing method for automobile interior parts that can produce high-quality automobile interior parts without delamination.

[0015]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a base material formed into a desired shape by thermoforming a cellulosic low-density mat formed into a sheet shape by wet papermaking; In the method for manufacturing an automobile interior part in which a skin material attached to the front side of the base material and a nonwoven fabric for adhesive medium attached to the back side of the base material are laminated and integrated, the raw material of the base material is A process of stacking the fabric with a nonwoven fabric for an adhesive medium and heating and integrating it with a hot plate, and forming the original fabric of the base material with the nonwoven fabric for an adhesive medium integrated in the above process and the skin material into the desired shape using a cold press mold. The method is characterized by comprising a step of laminating and integrating the two.

[0016]

[Function] As is clear from the above structure, when heating the base material, in order to heat and integrate the adhesive medium nonwoven fabric onto the back side of the base material, the material is set in the press mold by placing the material on the surface. Only the material and base material are required, and the conventional work of setting the adhesive nonwoven fabric in a press mold can be eliminated.

Furthermore, since one side of the heated base material is adhered with the nonwoven fabric for adhesive medium, the cooling rate of the base material can be slowed down due to the heat insulating effect of this nonwoven fabric for adhesive medium, improving moldability and improving the nonwoven fabric. Increases adhesion to.

Furthermore, since the base material and the nonwoven fabric attached to the back side of the base material are crimped in two steps: a heating process and a pressing process, the bond between the base material and the back side nonwoven fabric is further strengthened.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing interior parts for automobiles according to the present invention will be explained in detail with reference to the accompanying drawings.

FIG. 1 is an overall perspective view showing a trunk lid trim manufactured by applying the method of the present invention, FIG. 2 is a sectional view showing the trunk lid trim attached to a trunk lid panel, and FIGS. 3 to 5 are illustrations of the present invention. FIG. 3 is a cross-sectional view showing each step of the invention method.

The structure of a trunk lid trim 10 manufactured by applying the method of the present invention will be explained with reference to FIGS. 1 and 2.

This trunk lid trim 10 includes a base material 11 that is lightweight, inexpensive, and has appropriate rigidity, a nonwoven fabric 12 that is attached to the surface side of the base material 11 to provide decorative properties, and a base material 11, and the clip mounting seat 1
It is composed of a three-layer structure of adhesive medium non-woven fabric 13 that ensures an attachment strength of 4.

More specifically, from the viewpoint of resource saving, the base material 11 is formed into a sheet by wet paper-making using recycled paper and impregnating the recycled paper with a thermoplastic resin such as polypropylene resin or polyethylene resin. By thermoforming the cellulose-based low-density mat, it is formed into a desired shape and desired rigidity, and the skin material 12
In consideration of adhesion to the base material 11, a nonwoven fabric made of synthetic fibers such as polypropylene or polyethylene that is compatible with the base resin used for the base material 11 is used.

Next, it is desirable that the adhesive medium nonwoven fabric 13 has a high melting point, and a high melting point polyester fiber nonwoven fabric is used in this embodiment.

In order to attach the trunk lid trim 10 to the vehicle body side, the elastic fitting piece 15a of the resin clip 15 attached to the clip attachment seat 14 attached to the back side of the trunk lid trim 10 is attached to the trunk lid panel 16.
By press-fitting into the mounting hole 17 of the product, it is possible to reliably mount the mounting tool without exposing it to the surface of the product.

Next, a method for manufacturing the trunk lid trim 10 will be explained in detail based on FIGS. 3 to 5.

First, as shown in FIG.
The raw fabric M of the base material 11 and the adhesive medium nonwoven fabric 13 are set between them, and heated and compressed between the hot plates 20 and 21 to heat and soften the raw fabric M and adhere it to one side of the raw fabric M. The medium nonwoven fabric 13 is integrated. At this time, the temperature of the hot plates 20 and 21 is adjusted to 200 to 220°C.

Thereafter, as shown in FIG. 4, after the skin material 12 is set in the cold press lower mold 30, the original fabric M with the nonwoven fabric 13 heated and compressed in the above step is set above it. At this time, the outer edge of the skin material 12 is connected to the fixing pin 31.
The skin material 12 is held in a state where appropriate tension is applied thereto.

Thereafter, as shown in FIG. 5, the upper mold 32 for cold press is lowered, and the upper mold 3 for cold press
0,32 to integrate the skin material 12, base material 11, and adhesive medium nonwoven fabric 13, and mold them into a desired shape.

[0030] The method of the present invention consists of the above steps,
Since the adhesive medium nonwoven fabric 13 is integrated when heating the original fabric M of the base material 11, it is possible to eliminate the work of setting the adhesive medium nonwoven fabric 13 in an appropriate position while applying tension to the lower mold 30 for pressing. It is expected that production yield will improve by shortening the process.

[0031] By reducing the number of steps, the base material 11
The time from the end of heating the original fabric to the press processing can be shortened, and since the adhesive medium nonwoven fabric 13 is attached to the back side of the original fabric M of the base material 11, it may be difficult to cool the original fabric M. During cold press molding, a considerable amount of residual heat remains in the raw fabric M, so that not only good moldability can be obtained, but also strong adhesion to the skin material 12 can be expected.

Furthermore, in the method of the present invention, the adhesive medium nonwoven fabric 13 is pressed and integrated with the original fabric M of the base material 11 in a heating process, and is also pressed in a cold press molding process, and is subjected to two crimping processes. Therefore, as shown in Table 1, the bonding strength between the base material 11 and the adhesive medium nonwoven fabric 13 is strengthened compared to the conventional one.

[0033]

[Table 1]

[0034]

[Effects of the Invention] As explained above, the method of the present invention has the following special effects.

(1) In order to integrate the nonwoven fabric for adhesive medium to be attached to the back side of the base material during the heating process of the original fabric of the base material, the troublesome work of setting the nonwoven fabric for adhesive medium on the lower press mold while applying tension is necessary. It has the effect of improving production efficiency by shortening the number of processes because it can be done in a short time even by one person.

(2) It is possible to eliminate the work of setting the nonwoven fabric for adhesive medium in the lower mold of the press, it is possible to hasten the process from the end of heating the base material to press processing, and the nonwoven fabric for adhesive medium can be placed on the back side of the original base material. Since the cooling of the base material can be delayed, there is considerable residual heat in the base material during the press integration process of the base material and skin material, and there is no cracking during molding, resulting in excellent molding. This has the effect of not only providing good properties but also providing strong bonding strength between the base material and the skin material.

(3) Since the bonding between the base material and the nonwoven fabric for adhesive medium is carried out in two steps: a heating process and a pressing process, the bonding strength between the base material and the nonwoven fabric for adhesive medium is higher than that of conventional ones. This reinforcement has the effect of increasing the attachment strength of clip attachment seats and the like attached to the back surface of interior parts.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view showing a trunk lid trim manufactured by the method of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a cross-sectional view showing one step of the method of the present invention, which shows a step of heat-pressing a base material and a nonwoven fabric for an adhesive medium.

FIG. 4 is a cross-sectional view showing one step of the method of the present invention, showing the step of setting the skin material and base material material into a press mold.

FIG. 5 is a cross-sectional view showing one step of the method of the present invention, showing a step of integrally pressing the base material and the skin material.

FIG. 6 is a chart diagram illustrating a conventional manufacturing process for interior parts.

FIG. 7 is a cross-sectional view showing a heating process of a base material, showing a conventional method for manufacturing interior parts.

FIG. 8 is a cross-sectional view showing a process of setting materials into a press mold, showing a conventional method for manufacturing interior parts.

FIG. 9 is a cross-sectional view showing an integral pressing process, showing a conventional method for manufacturing interior parts.

[Explanation of symbols]

10 Trunk lid trim 11 Base material 12　Skin material 13 Nonwoven fabric for adhesive medium 14 Clip mounting seat 20, 21 Hot plate 30 Lower mold for cold press 31 Fixing pin 32 Upper mold for cold press M Original fabric

Claims (1)

[Claims] 1. A base material (11) formed into a desired shape by thermoforming a cellulose-based low-density mat formed into a sheet by wet paper-making, and a base material (11) that is adhered to the surface side of this base material (11). In the method for manufacturing an automobile interior part, which comprises laminating and integrating a skin material (12) and a nonwoven fabric for adhesive medium (13) attached to the back side of the base material (11), the base material (11) Layer the original fabric with the nonwoven fabric for adhesive medium (13),
A step of heating and integrating with a hot plate (20, 21), and a step of cold pressing the base material (11) with the nonwoven fabric for adhesive medium (13) integrated in the above step and the skin material (12). 1. A method for manufacturing interior parts for automobiles, comprising the steps of laminating and integrating them into a desired shape using molds (30, 32).