JPH0449014A - Fixing method of clip to interior finish material for automobile - Google Patents

Abstract

PURPOSE:To mount clips through a simple process, and to increase the rigidity of an interior finish material while obtaining the interior finish material having degree of freedom of a shape by laying the interior finish material on one mold surface of a split mold, inserting the mounting sections of the clips into holes formed to the other mold surface respectively and closing the mold, and injecting a foamed polyurethane raw material and foam-molding the raw material. CONSTITUTION:The mounting section 7 of a clip 5 is inserted into the hole 11 of a female mold 10, and fixed temporarily. An interior finish material 8 is laid on the mold surface of a male mold 9 by vacuum suction. When the mold is closed and a foamed polyurethane raw material 12 is injected into a cavity, the foamed polyurethane raw material 12 is fluidized in a cavity, also creeps to the periphery of the head section 6 of the clip 5 and is foam- molded. Accordingly, a polyurethane foam layer 3 is formed on the rear of the interior finish material 8 while the head section 6 of the clip 5 is buried and can be fixed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to interior materials for automobiles,
The present invention relates to a method for fixing a clip to a body panel, and particularly to a method for fixing a clip while forming a polyurethane foam layer on the back surface of an interior material.

[Conventional technology]

When fixing heavy-duty automobile interior materials, such as floor carpets, deck carpets, door trims, pillar trims, molded ceilings, etc., to the body panel, it is generally done by pushing the clips fixed to the back of the stiff interior material into the body panel. There is. Taking a floor carpet as an example, the tunnel site, floor surface, part of the rocker, standing walls, etc. have deep drawings, so it is difficult to obtain a shape that fits the shape of the potty panel by integral molding. For this reason, these parts have recently been divided and molded to provide excellent fit. In a subsequent process, these interior materials are fixed in place by fixing a plurality of clips to desired locations using hot melt adhesive and pushing them into mounting holes provided in the body panel.

In addition, compared to general parts, the backing layer resin on the back of the carpet is stretched and becomes thinner, resulting in lower rigidity, so the back side is made of a hard sheet, polypropylene (PP), etc.
Stiffness is increased by attaching sheets, etc.

[Problem to be solved by the invention]

However, in the method of fixing the lip as described above, the lip is fixed with a hot melt adhesive in a post-process, which makes it impossible to simplify the process and has poor productivity. In addition, these interior materials have the above-mentioned sheets attached to them to increase their rigidity, but since they are flat sheets that have been thermoformed, there are restrictions depending on the shape of the reinforced parts, so the rigidity of the above-mentioned parts cannot be satisfied. However, there was a problem in that it could not be obtained, and moreover, it warped due to shrinkage after molding. Furthermore, since the sheet was just pasted on, it was not possible to absorb the beats of the body panel, and it was not possible to obtain a flat surface, resulting in an unsatisfactory appearance.

The present invention has overcome the above-mentioned problems and is an automotive vehicle that allows clips to be attached in a simple process without using adhesives, increases the rigidity of interior materials, and provides interior materials with a high degree of freedom in shape. The purpose of the present invention is to provide a method for fixing a clip to an interior material.

[Means to solve the problem]

The method of fixing a clip to an automobile interior material according to the present invention to achieve the above object is as follows: laying an interior material previously formed into a desired shape on the mold surface of one of the split molds; The attachment parts of the clips are inserted and set into a plurality of holes formed on the mold surface, and then, after the split mold is closed, foamed polyurethane raw material is injected into the cavity and foam molded, A polyurethane foam layer is formed on the back surface of the interior material, and the head of the clip is embedded.

In addition, instead of injecting the foamed polyurethane raw material and foam-molding it to form a polyurethane foam layer on the back side of the interior material, it is possible to inject the foamed polyurethane raw material mixed with glass fiber and foam-molding it to form the polyurethane foam layer on the back side of the interior material. It is effective to form a layer of polyurethane foam mixed with glass fibers.

[For production]

An interior material is laid on one mold surface of the split mold, and the attachment parts of the clips are inserted and set into the plurality of four parts formed on the mold surface of the other mold, and then the split mold is closed. Then, when a predetermined amount of foamed polyurethane raw material is injected into the cavity, the foamed polyurethane raw material foams to form a polyurethane foam layer on the back surface of the interior material, and the head of the clip is embedded and fixed.

Furthermore, when glass fiber is mixed into the polyurethane foam layer, the rigidity can be further improved and thermal dimensional changes can be minimized.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

FIG. 1 is a cross-sectional view of the main parts of a molded product formed by an embodiment of the method of the present invention, showing a state in which it is attached to a body panel.

The interior material 8 for an automobile is composed of a carpet 1 backed with a backing layer 2.

The carpet 1 is made of needle punch carpet, tufted carpet, etc., and the back side of this carpet is made of polyethylene,
It is lined with a backing layer 2 made of a thermoplastic resin such as polypropylene or ethylene vinyl acetate copolymer. Of course, it is also possible to appropriately mix fillers such as calcium carbonate, barium sulfate, talc, and mica into these thermoplastic resins.

3 is a polyurethane foam layer, which is a cushion layer formed by injection foaming of foamed polyurethane raw materials. In the polyurethane foam layer 3, a clip 5 for fixing the interior material 8 to the body panel 4 is insert-molded with its head 6 buried in the polyurethane foam layer 3 and its mounting portion 7 exposed. It is fixed by

A first embodiment of the present invention will be described.

First, a split mold consisting of a male mold 9 and a female mold 10 used in this example will be explained.

As shown in FIG. 2, there are a plurality of holes 11 (only one is shown in the drawing) on the mold surface of one mold, the female mold IO.
are formed at appropriate locations, and the mounting portions 7 of the clips 5 can be inserted into each type 11, respectively.

The other mold, the male mold 9, has a vacuum hole (not shown) that communicates with a vacuum source, and is configured so that the interior material 8 can be placed on the mold surface by vacuum suction.

The vacuum holes may be distributed over the entire surface of the mold so that the entire surface of the interior material 8 is vacuum-adsorbed, or they are distributed only on the peripheral edge of the mold surface so that the peripheral edge of the interior material 8 is vacuum-adsorbed. You can do it like this. Further, in order to set the clip 5 so that it does not move, the depth of each of the holes 11 is set appropriately depending on the total length from the head 6 of the clip 5 to the attachment part 7, and the shape of the hole 11 is It is preferable to adopt a shape that follows the shape of the mounting portion 7 of No. 5. Reference numeral 13 indicates a recess provided in the mold surface of the female mold 10, and the recess 13 is formed in a pattern similar to the pattern of a bead (not shown) of the body panel 4. As a result, when the molded product molded by the method of this embodiment is fixed to the body panel 4, it adheres well to the body panel 4, and the surface of the carpet 1 is kept smooth.

Here, the steps of this example will be explained.

As shown in FIG. 2, the arrowhead-shaped attachment portion 7 of the clip 5 is inserted into the hole 11 of the female mold 10 and temporarily fixed. Also, male type 9
The interior material 8, which has been previously formed into a desired shape using another mold, is placed on the mold surface by vacuum suction with the carpet 1 side facing the mold surface. In this case, the backing layer 2 is on the back side of the carpet 1.
Since it is lined, the interior material 8 has no air permeability, which is convenient for vacuum suction.

The head part 6 of the clip 5 consists of two stages of flange parts 6-1 and 6-2, and the flange part 6-2 on the mounting part 7 side is formed to have a larger diameter than the hole 11 (see Fig. 1). reference). As a result, when the clip 5 is set, the hole 11 is closed, so that the foamed polyurethane raw material can be prevented from flowing into the hole 11.

Next, as shown in FIG. 3, after the male mold 9 and the female mold 10 are closed, a predetermined amount of foamed polyurethane raw material 12 is injected into the cavity from an injection port (not shown), and the foamed polyurethane raw material 12 is poured into the cavity. The foam flows around the head 6 of the clip 5 and is foam-molded. Thereby, the polyurethane foam layer 3 can be formed on the back surface of the interior material 8 and the head 6 of the clip 5 can be buried and fixed at the same time.

Next, a second embodiment of the present invention will be described.

In this embodiment, as shown in FIGS. 4 and 5, the male type 2
This embodiment is different from the first embodiment in that a split mold is used in which a plurality of holes 21 and recesses 23 are formed on the mold surface of 9, and a vacuum suction hole (not shown) is provided in the female mold 20 to communicate with a vacuum source. hand,
The other details are the same as those in the first embodiment, so the explanation thereof will be omitted.

In the first and second embodiments described above, the attachment part 7 of the clip 5 is inserted and set into a plurality of holes formed in the mold surface of one of the molds, but as shown in FIG. When molding the interior material 8 into a desired shape using another mold in advance, the end face of the head 6 of the clip 5 is welded using the thermoplasticity of the backing layer 2 and temporarily pressed, and this is then molded into one mold. It can also be installed by vacuum adsorption.

In addition, in each of the above examples, after closing the split mold,
Instead of injecting foamed polyurethane raw material into the cavity and foaming it, and forming a polyurethane foam layer on the back side of the interior material, glass fiber is mixed into the foamed polyurethane raw material). It is also possible to form a polyurethane foam layer mixed with fibers. In this case, the glass fiber preferably has a thickness of 10 to 50 μm and a length of 1 to 50 mm.

When a polyurethane foam layer mixed with glass fiber is formed, the rigidity of the molded article increases and the thermal dimensional stability also improves.

Furthermore, the clips used in the method of the present invention may be of the shapes shown in FIGS. 7 and 8, in addition to those shown in the above embodiments.

The clip 5a shown in FIG. 7 has a mounting portion 7a having a conical shape, and two flange portions 6a-1 and 6a-2 having a diameter that allows the head portion 6a to be inserted into a hole 11.21 provided in the mold surface. Consisting of When using this clip 5a, if the collar part 6a-2 on the attachment part 7a side is covered with an annular synthetic resin film 14 made of polyethylene, polypropylene, polyurethane, polyester, etc. with a thickness of 10 to 300 μm,
It is possible to prevent the polyurethane raw material 12 from flowing into the large circle formed on the mold surface.

The clip 5b shown in FIG. 8 differs from the clip 5a shown in FIG. 7 only in that the attachment portion 7b is shaped like an arrowhead, and the other parts are the same, so a description thereof will be omitted. moreover,
The clip may have only one flange.

The foamed polyurethane raw material 12 is rigid foamed polyurethane,
[Effects of the Invention] Since the present invention is configured as described above, the foaming ratio is preferably 2 to 5 times. It has a great effect.

(1) Since the clip is set in the hole formed in one of the split molds, the position of the clip will not shift or fall due to the injection pressure of the foamed polyurethane raw material or the foaming pressure during foaming. Moreover, it can be fixed securely.

(2) Since the clip is fixed at the same time as the polyurethane foam raw material is injected and foamed, there is no need to use adhesive in the subsequent process, and the clip can be fixed in a continuous process, significantly increasing productivity.

(3) When glass fiber is mixed into the polyurethane foam layer, the rigidity of the interior material can be uniformly increased.In the case of carpets, the backing layer becomes thinner at the tunnel side and deep-drawn parts of rocker products, increasing the rigidity. It is possible to reinforce the parts where the stiffness has decreased, and it is possible to obtain an interior material with uniformly increased overall rigidity. Also,
By incorporating glass fiber, thermal dimensional changes can be minimized, and an interior material with excellent shape retention and less shrinkage after molding can be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the main part of a molded product molded by the method of the present invention, FIGS. 2 and 3 are cross-sectional views of the main part showing each step of the first embodiment of the present invention, and FIG. and FIG. 5 are sectional views of essential parts showing each step of the second embodiment of the present invention, and FIG. 6 is a sectional view of essential parts showing a state in which a clip is temporarily fixed to an interior material according to a third embodiment of the present invention. , FIG. 7, and FIG. 8 are sectional views showing other examples of the clip used in the present invention. 1...carpet, 2...-backing layer, 3
...Polyurethane foam layer, 4-. Hoty panel, 5.5a, 5b... Clip, 66a, 6b... Head, 77a, 7b... Mounting part, 8... Interior material, 9. 29
・-・Female type, 10.20...Female type, 11.21...
Hole, 12... Foamed polyurethane raw material, 13.23.-
- Concavity, 14...Synthetic resin film. Patent applicant: Hayashi Telempu Co., Ltd.

Claims (1)

[Scope of Claims] 1. Laying the interior material pre-molded into a desired shape on the mold surface of one of the split molds, and attaching clip attachment portions to each of the plurality of holes formed on the mold surface of the other mold. is inserted and set, and then, after closing the split mold, a foamed polyurethane raw material is injected into the cavity to perform foam molding, and a polyurethane foam layer is formed on the back surface of the interior material, and A method for fixing a clip to an automobile interior material, comprising burying the head of the clip. 2. Instead of injecting a foamed polyurethane raw material and foam-molding it to form a polyurethane foam layer on the back side of the interior material, instead of injecting a foamed polyurethane raw material mixed with glass fiber and foaming it, and forming a polyurethane foam layer on the back side of the interior material. 2. The method for fixing a clip to an automobile interior material according to claim 1, wherein a polyurethane foam layer mixed with fibers is formed.