JPH04257407A - Interior part for automobile and forming method of skin material thereof - Google Patents

Abstract

PURPOSE:To facilitate the enfolding operation of a turned-up part and aim at the reduction of the material cost and weight of the interior part concerned by a method wherein no slush foamed layer is adhered to the turned-up part at the peripheral edge of the skin material of slush molding. CONSTITUTION:At the slush molding of foaming resin powder P2, sealing material 41 is extended to the setting site of the turned-up part 16 of skin material 13 in order to form air passage 44 directing from the periphery of a mold 20 to its center between the mold 20 and the sealing material 41, resulting in constituting the structure for removing foaming powder P2 at the turned-up part 16 by blowing air against the air passage 44.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to automotive interior parts such as automotive door trims, and a method for molding skin materials used for interior parts.

0002

[Prior Art] Fig. 5 shows an automobile door trim which is a typical example of an automobile interior part.The automobile door trim 1 consists of a core material 2 which is press-molded into a desired shape, and a surface of the core material 2. It is composed of a pad material 3 that is laminated and integrated into a pad material 3 to provide cushioning properties, and a skin material 4 that covers their outer surfaces. Manufactured by gluing.

[0003] Recently, there has been a trend that good surface appearance and surface feel are required for automotive interior parts.
Therefore, as the skin material 4, a slash molded skin material (usually a slash foam layer 4b on the back side of the slash skin layer 4a) is used.
(consisting of a two-layer laminate) is widely used.

[0004] Furthermore, as described above, as the end treatment of the skin material 4, the peripheral end portion of the skin material 4, that is, the folded portion 5
When the slush molded skin material 4, which is made up of the slush skin layer 4a and the slush foam layer 4b, is thick, the slush molded skin material 4 is thick, so the slush-molded skin material 4 is cumbersome. The problem of interference arises.

As a countermeasure against this problem, for example, as shown in FIG. 6, a powder box 7 filled with foamable resin powder is joined to a slush molding die 6 for molding the skin material 4, and a rotation operation is performed. At the stage of attaching the foamable powder to the upper surface of the slush skin layer 4a attached to the mold 6, a plurality of air blowing pipes 8 are installed in the powder box 7, and a large number of In the process of blowing air onto the mold 6 surface through the air outlet 8a to remove excess foamable powder, the air pressure is adjusted so as to reduce the thickness of the folded portion 5 of the skin material 4, A method is adopted in which the foamable powder in the folded portion 5 is mainly removed.

Further, as shown in FIG. 7, after forming a slush skin layer 4a and a slush foam layer 4b in a slush molding die 6, a portion corresponding to the folded portion 5 of the skin material 4 is pressed with a press tool 9. There is also a well-known method of forming a thinner wall by pressing the same.

[0007]

[Problems to be Solved by the Invention] However, the former method, that is, the piping 8 installed inside the powder box 7
In the method of intensively removing the foamable powder in the folded part 5, the foamed layer 4b in the folded part 5 is
Although the thickness of the folded part 5 is thinner than that of the general part, there is a limit, and it is not an effective measure to reduce the thickness of the folded part 5, but it poses a problem in smooth winding operation, and it also adheres to the folded part 5. The disadvantage is that the foamable powder 4b produced is wasted and there is a lot of material loss.

Furthermore, in the method of removing the foamable powder through the air outlet 8a of the piping 8, it is difficult to apply uniform air pressure, and the thickness of the slush foam layer 4b is uneven, which appears as unevenness on the product surface. It has also been pointed out that it is undesirable in terms of appearance or feel.

In addition, in the latter method using the press tool 9, the pressing must be performed when the slush molding die 6 is cooled and the temperature of the die 6 is below 100°C and above 60°C. The cost of equipment for timing during press processing is large, leading to high costs, and silicone rubber is usually used as the press tool 9, but silicone rubber is not durable, so it must be replaced frequently. This is also a factor leading to high costs.

Furthermore, in the method of thinning the folded part 5 of the skin material 4 using the press tool 9, although the thickness of the folded part 5 becomes thinner, the rigidity increases and the repulsion force increases, so that the folded part 5 is not rolled up. During operation, this repulsive force has a fatal drawback in that a smooth retraction operation cannot be expected.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a slush molded skin made of a laminate of a slush skin layer and a slush foam layer as a skin material for interior parts. In interior parts for automobiles, the peripheral end of the skin material can be easily rolled up, and the peripheral end of the product is thinned to prevent interference with mating parts. An object of the present invention is to provide a method for forming a skin material used for interior parts.

0012

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a core material molded into a desired shape, a core material that is integrally attached to the surface of the core material, and a peripheral end portion facing the back surface of the core material. In an automobile interior part comprising a slush-molded skin material that is folded back and fixed to the slush-molded skin material, the slush-molded skin material is composed of a laminate of a slash skin layer and a slash foam layer, and the folded portion of the skin material is formed into a slush skin layer. It is characterized by being formed of only layers.

Furthermore, the method for molding the skin material used for interior parts according to the present invention involves joining a powder box filled with resin powder to a slush molding mold, and performing a rotation operation to coat the surface of the mold with resin powder. The slush skin layer is formed by attaching and melting the slush skin layer, and the powder box filled with foamable resin powder is joined to the mold, and a rotation operation is performed to adhere the foamable resin powder to the top surface of the slush skin layer. forming an air passage from the peripheral edge toward the center in the folded part of the layer, and removing foamable resin powder adhering to the top surface of the folded part by blowing air into the air passage; It is characterized by a mold heating and cooling process in which a mold with foamable powder adhered to the slush skin layer is heated and cooled.

[0014]

[Operation] As is clear from the above structure, since the folded part of the skin material is composed of only the slash skin layer,
When the folded part is rolled into the back side of the core material, the repulsive force of the skin material is extremely small, and smooth end processing can be expected.

Furthermore, since the folded portion of the skin material is formed only by the slash skin layer and no slash foam layer is attached, material loss of the foamable powder is small.

In addition, since the folded portion of the skin material is only a slash skin layer and the thickness of the end portion of the peripheral edge of the product is small, interference with the mating part can be prevented and gaps will not occur between the product and the mating part. There is nothing to do.

Furthermore, according to the method of the present invention, when the foamable powder is attached during slush molding, an air passage is formed from the periphery toward the center at the folded part of the slush skin layer, and air is blown into this air passage. In addition, the foamable powder does not have uneven thickness, the thickness of the folded portion can be made uniform, and a simple structure of just forming an air passage is sufficient.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the method for molding automotive interior parts and skin materials according to the present invention will be explained in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing an embodiment in which an automobile interior part according to the present invention is applied to an automobile door trim, and FIG.
3 is a cross-sectional view showing the configuration of a folded part of a skin material of an automobile door trim, and FIGS. 3 and 4 are cross-sectional views showing a slush molding process of a skin material used for a door trim.

First, a door trim will be explained as an example of an automobile interior part according to the present invention. In FIG. 1, an automobile door trim 10 includes a core material 11 press-molded into a desired shape and A pad material 12 such as polyurethane foam that is laminated and integrated on the surface side of the material 11 to provide cushioning properties, and a slush molded skin material 13 that is further laminated on the outer surface of the pad material 12 for the purpose of improving the surface appearance and surface feel. It is roughly structured.

More specifically, slush molded skin material 1
3 is composed of a laminate of two layers, a slash skin layer 14 and a slash foam layer 15 from the surface side, and
A folded portion 16 that is wrapped around and adhered to the peripheral end portion of the skin material 13, that is, the back side of the core material 11, is composed of only the slash skin layer 14, and the slash foam layer 15 is removed.

That is, as shown in FIG. 2, the folded portion 16 at the peripheral edge end portion of the slush-molded skin material 13 is composed only of the slush skin layer 14 and is thin-walled with low rigidity, so that the repulsive force is extremely small. It has the advantage that it can be smoothly rolled up and adhered to the back side of the core material 11, and the end processing work can be performed smoothly.

Furthermore, by making the folded portion 16 thinner, the thickness of the peripheral portion of the door trim 10 can be set to be smaller, thereby preventing interference with the mating part. This can effectively solve the conventional problem that a gap is created between the two and the appearance deteriorates.

In addition, since the folded portion 16 consists of only the slash skin layer 14, the amount of foaming powder can be saved compared to the conventional case in which a slash foam layer is attached to this portion, contributing to cost reduction and weight reduction. .

Next, a preferred embodiment of the process of forming the slush-molded skin material 13 will be explained based on FIGS. 3 and 4.

FIG. 3 shows the process of forming the slush skin layer 14 of the slush molding skin material 13. A powder box 30 filled with resin powder P1 such as PVC resin powder is placed in the slush molding mold 20. After joining via the sealant 31, the mold 20 and the powder box 30 are moved around the rotating shaft 21 provided in the mold 20.
By rotating the resin powder P1, the resin powder P1 is attached to the mold surface of the mold 20, and the slush skin layer 14 is formed by melting the resin powder P1.

Next, as shown in FIG. 4, in succession to the step of forming the slush skin layer 14, a powder box 40 filled with foamable powder P2 prepared by mixing a foaming agent such as azodicarbonamide into PVC resin powder is placed. The foaming powder P2 is attached to the upper surface of the slash skin layer 14 by joining it to the mold 20 with the slash skin layer 14 formed thereon via the sealant 41 and performing a rotation operation.

At this time, the shape of the sealing material 41 is as shown in FIG.
As shown in FIG.
An extension part 43 is provided that extends to a set location, and a clearance of 3 to 5 mm is formed between this extension part 43 and the mold 20. Then, use this clearance as the air passage 44.
Use this to blow air from the periphery toward the center.

Therefore, the air from the air supply pipe 45 is blown into the air passage 44, and the air is blown from the peripheral edge of the mold toward the center, so that the air is blown into this part, that is, the folded part 16 of the skin material 13. At the corresponding locations, all the foamable powder P2 adhering to the upper surface of the slush skin layer 14 is removed and collected into the powder box 40. Note that reference numeral 46 in the figure indicates an air outlet for discharging internal air to the outside.

Thereafter, the mold 20 in which the foamable powder P2 adhering to the upper surface of the slush skin layer 14 has been formed is heated and cooled to form the skin material 13 shown in FIG. As shown, the folded part 16
The foamable powder P2 is not attached to the layer, and the layer is composed only of the slush skin layer 14.

As described above, according to the steps shown in FIGS. 3 and 4, the skin material 13 having the folded portion 16 formed only by the slash skin layer 14 can be easily and reliably formed by simply changing the shape of the sealing material 41. This has the advantage that the folded portion 16 can be reliably made thinner without requiring large-scale equipment.

[0032]

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

(1) According to the automobile interior parts according to the present invention, the folded portion at the peripheral edge of the skin material is composed of only the slash skin layer, and when the folded portion is rolled into the back side of the core material, the folded portion of the skin material is The repulsive force is extremely small, and smooth winding operation can be expected, which has the effect of significantly improving work efficiency.

(2) According to the automobile interior parts according to the present invention, since the foamable powder is not attached to the folded portion of the peripheral edge of the skin material, the foamable powder can be saved, which contributes to cost reduction and weight reduction. It has the effect of being able to.

(3) According to the automobile interior parts according to the present invention, since the folded portion of the peripheral edge of the skin material is composed of only the slash skin layer, there is no thick folded portion or uneven thickness folded portion as in the conventional case. Compared to those that use the same, it is possible to prevent interference with the mating parts, and there is no gap between the mating parts and the appearance is favorable.

(4) According to the method for molding a skin material according to the present invention, it can be carried out using a molding apparatus having a simple configuration in which an air passage is formed between the mold and the sealing material from the peripheral edge toward the center. , since it does not require large-scale equipment, it has the effect of being able to be implemented at low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of an automobile door trim, which is an embodiment of an automobile interior component according to the present invention.

FIG. 2 is a cross-sectional view showing the end treatment process of the automobile door trim shown in FIG. 1;

FIG. 3 is a cross-sectional view showing a slash skin layer forming step in the step of forming the skin material of the automobile door trim shown in FIG. 1;

4 is a sectional view showing a step of forming a slush foam layer in the step of forming a skin material of the automobile door trim shown in FIG. 1; FIG.

FIG. 5 is a sectional view showing the structure of a conventional automobile door trim.

FIG. 6 is a sectional view showing a conventional method for thinning a folded portion of a skin material.

FIG. 7 is a sectional view showing a conventional method for thinning a folded portion of a skin material.

[Explanation of symbols]

10 Automotive door trim 11 Core material 13 Slash molded skin material 14 Slash skin layer 15 Slash foam layer 16 Folding part 20 Slash molding mold 21 Rotation axis 30 Powder box 31 Sealing material 40 Powder box 41 Sealing material 44 Air passage P1 Resin powder P2 Foaming resin powder

Claims (2)

[Claims] Claim 1: A core material (11) formed into a desired shape, and a slush molding that is integrally adhered to the surface of the core material (11), and the peripheral end portion is folded back and fixed to the back side of the core material (11). In an automobile interior part consisting of a skin material (13),
The slush-molded skin material (13) is composed of a laminate of a slush skin layer (14) and a slush foam layer (15), and the folded portion (13) of the skin material (13)
16) is formed only of a slash skin layer (14). 2. A method for molding a skin material (13) for use in automobile interior parts according to claim 1, wherein a powder box (30) filled with a resin powder (P1) is placed in a slush molding mold (20). A step of forming a slush skin layer (14) in which the resin powder (P1) is adhered and melted to the surface of the mold (20) by joining and performing a rotation operation, and a powder box (40) filled with the foamable resin powder (P2). ) to the mold (20) and perform a rotation operation to adhere the foamable resin powder (P2) to the upper surface of the slash skin layer (14),
In the folded part (16) of the slash skin layer (14), an air passage (44) is formed from the peripheral edge toward the center, and by blowing air into this air passage (44), the upper surface of the folded part (16) is A step of forming a slush foam layer (15) to remove the adhered foamable resin powder (P2), and heating and cooling the mold (20) with the foamable powder (P2) adhered on the slash skin layer (14). A method for molding a skin material, comprising heating and cooling a mold (20).