JP2002264696A - Forming method for facing layer of automobile interior equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forming method for a facing layer of an automobile interior equipment capable of forming a second fragile line part without a relief line or laser machining in forming a facing layer in an automobile interior equipment having a back cover part by spray forming. SOLUTION: This method forms the facing layer in the automobile interior equipment having an air back cover part and including a base layer and a facing layer in the vertical section by spray forming. The tear line of the air bag cover part is formed by a first fragile line part formed in the base layer and the second fragile line part formed in the facing layer. In the spray forming facing body layers 35, 36 by a facing layer forming metal mold 29, joints 38 are generated by a plurality of spray processes to form the second fragile line part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a skin layer of an automotive interior article having an airbag cover and having a vertical cross section including a base layer and a skin layer by spray molding.

[0002] In the present specification, an instrument panel (hereinafter abbreviated as "instrument panel") of an airbag mounting type will be mainly described as an example of an automobile interior component having an airbag cover portion, but other components will be described. The same applies to the case where an airbag is mounted on a side door, a pillar, a front / back seat or the like.

[0003]

2. Description of the Related Art In recent years, airbag devices have become standard equipment in instrument panels.

As an instrument panel, there is an instrument panel having a substantially three-layer structure in which a vertical section includes a base material (core material) layer and a skin layer and a foam layer is formed between the two layers (Japanese Patent Application Laid-Open No. 10-50)
0366, JP-A-11-321519, JP-A-11-321519
000-280847). The reason why the foamed layer is formed between the base material layer and the skin layer is mainly from the viewpoint of improving the tactile sensation.

[0005] From the viewpoint of productivity, the skin layer having the above structure is
It may be formed by slash molding (the above-mentioned publication) or spray molding (the above-mentioned publication). These molding methods are:
This is because a layer continuous with the skin layer can be formed using the same mold after forming the skin layer.

[0006] The above-mentioned slush molding uses PVC as a material.
(Polyvinyl chloride) is the mainstream, but its use tends to be restricted in the future from an environmental point of view. For this reason, environmentally friendly polyurethanes which have little to no problem or even olefinic thermoplastic elastomers (TP
O) is inevitable. Also, low-cost spray molding is attracting attention.

On the other hand, a tear line is provided on the airbag cover of the instrument panel so that the bag door is opened (in the manner of a hinged door) when the airbag is activated. The tear line includes a first weak line portion (for example, a break groove or a perforation) formed in the base material layer and a second weak line portion (usually, a relief line (embossed groove)) formed in the skin layer. Was.

The reason why the second brittle line portion is formed on the skin layer is that the skin layer is formed of an elastomer material having a large breaking elongation (200% or more, desirably 400% or more) from the viewpoint of feel (feel). If the second weak line portion is not formed in the skin layer, the skin layer does not break quickly even when the first weak line portion of the base material layer breaks quickly during operation of the airbag, that is, the predetermined amount or more. There is a possibility that the opening time of the bag door may vary as a result as a result of breaking after being extended.

From the standpoint of improving the design, the relief of an automobile interior part (in particular, an airbag cover part of an instrument panel) having an airbag cover part (hereinafter simply referred to as "bag cover part") with a lid part for an airbag. There is an increasing demand for a line (relief groove) -less system.

[0010] For this reason, as an alternative to the relief groove,
A technique for forming a second fragile line portion by performing laser processing or the like from the back surface of the skin layer is known (JP-A-2000-280).
847, etc.).

However, the above-mentioned laser processing increases capital investment costs, running costs, and the like, resulting in an increase in product cost.

In view of the above, the present invention relates to a relief line or laser processing for forming a skin layer of an automotive interior product having a bag cover portion and having a vertical section including a base material layer and a skin layer by spray molding. It is an object of the present invention to provide a method for forming a skin layer of an automobile interior part, which enables formation of a second fragile line portion regardless of the above.

[0013]

DISCLOSURE OF THE INVENTION The method for forming a skin layer of an automobile interior part according to the present invention solves the above objects (objects) by the following constitutions.

One aspect of the present invention has a bag cover portion,
A method of forming a skin layer in a vertical cross section of a car interior product including a base material layer and a skin layer by spray molding,
The tear line of the bag cover portion is composed of a first weak line portion formed on the base material layer and a second weak line portion formed on the skin layer, and at the time of spray molding, a seam is generated by a multi-stage spray process. A second weak line portion is formed.

Another aspect of the present invention is a method for forming a skin layer in an automobile interior product having a bag cover portion and having a vertical cross section including a base material layer and a skin layer by spray molding. The tear line of the portion is composed of a first weak line portion formed on the base material layer and a second weak line portion formed on the skin layer, and at the time of spray molding, a groove is formed when the skin layer is not cured. It is characterized by forming two weak line portions.

Still another aspect of the present invention is a method for forming a skin layer in an automotive interior product having a bag cover portion and having a vertical cross section including a base material layer and a skin layer by spray molding. The tear line of the portion is composed of a first weak line portion formed in the base material layer and a second weak line portion formed in the skin layer, and at the time of spray molding, a sheet-like reinforcement having a notch portion or a weak processing portion. The second embrittlement line portion is formed by embedding a material and performing molding.

In any of the above inventions, when forming a skin layer of an automotive interior product having a bag cover portion and having a vertical cross section including a base material layer and a skin layer by spray molding,
The second fragile line portion can be formed without using a relief line or laser processing.

That is, the second line of weakness in the skin layer is a seam, a groove, or a non-reinforcing portion (a brittle portion of a reinforcing material).
Can be easily formed simultaneously or simultaneously. Therefore, no special device such as laser processing is required even if the formation of the second line of weakness is performed without a relief line.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a method for forming a skin layer of an automobile interior part according to the present invention will be described with reference to an instrument panel 10 as shown in FIGS.

The instrument panel 10 has a bag cover portion 12 as shown in the figure, and has a vertical section having a base material layer 13 and a skin layer 14.
And a foam layer (cushion layer) 16 is interposed between the two layers 13 and 14. A similar three-layer structure is disclosed in JP-A-11-321519 and JP-A-2000-2000.
-280847.

The tear line 17 of the bag cover 12 is
First fragile line portion 19 formed on base material layer 13 and skin layer 14
And the second weakened line portion 21 formed at the center. In addition, the tear line 17 has a flat H-shape because the bag door portions 18 are double-opened (double-sided open) (see FIG. 1).

Here, the first fragile line portion 19 of the base material layer 13 is
The tear line 17 is formed by a cutout groove (V-shaped groove) at a corresponding portion. Since the bag door portions (hereinafter simply referred to as “door portions”) 18 and 18 are double-opened, hinge grooves 22 are provided between the upper and lower ends of the H-shaped first weakening line portion 19 so as to be easily rotated. Are formed.

The base material layer 13 includes a base material layer main body 13a.
And the base layer bag cover portion 13b are fused and integrated.

The base layer 13 has front and rear mounting walls 23 and 25 on the back side. The rear mounting wall 25 has a base wall 25a integrated with the back surface of the base layer 13 via a triangular plate reinforcing rib 27. And an attachment portion 25b is formed via an integral hinge portion 25c. This is because of the relationship of the die-cutting direction.

Here, usually, the base material layer bag cover 13
b is made of a material that is relatively softer than the base material layer main portion 13a in order to ensure the rotational flexibility and low-temperature flexibility of the bag door portion 18. For example, when the base material layer main body 13a is formed of fiber reinforced polypropylene (PPF), the base material layer bag cover 13b is formed of an olefin-based thermoplastic elastomer (TPO).

(1) The method for forming a skin layer according to one embodiment of the present invention is a method for forming a skin layer 14 (14A, 1A) of the instrument panel 10 having the above-described structure.
In spray forming 4B), a seam (weld) 38 is generated by a plurality of spraying steps to form the second weak line portion 21 (see FIG. 2).

Here, the spray molding is a method of forming a layer molded body (layer) by spraying a skin layer forming material such as two-part urethane on a shaping surface of a molding die using a nozzle or the like. (See Japanese Patent Application Laid-Open No. Hei 10-500366).

Specifically, when the H-shaped second fragile line portion 21 shown in FIG. 3 is formed, the skin layer 14 can be easily and reliably manufactured through the steps shown in FIG.

Here, the first mask jig 3 for covering the door portion side
Second mask jig 3 for covering 2, 32 and instrument panel body side
Prepare 3

However, when a plate-shaped masking jig is used, the second fragile line portion 21 is a closed so-called surrounding line (in the illustrated example, a Japanese character). The size of the first mask jigs 32 may be matched to the hinge portion, but is formed beyond the door hinge portion H in the illustrated example. Forming beyond the hinge portion H can reliably prevent the skin from breaking at the hinge portion.

First, as a pre-process, in order to improve the design and durability of the skin layer 14, that is, the instrument panel 10, a design / protective coating film 28 is applied to the outermost surface side of the skin layer 14 by a painting molding method (in- Mold decorating).
The design / protective coating film 28 is applied to the skin layer forming mold 29 by the design / protection coating 28.
It is formed by spraying a protective paint.

This design / protective coating (design / protective layer) 28
Is usually, but not necessarily, performed to conceal the seam constituting the second line of weakness 21. The layer thickness of the design / protection layer 28 is about 10 to 30 μm, preferably about 20 μm. If the thickness is too thin, the concealing effect of the seam is hardly exerted. If the thickness is too large, the soft feeling of the skin body layers 35 and 36 formed of the elastomer material (polymer elastic body) may be hindered.

As the paint, a paint based on a polymer having good adhesion to the skin body layer 35 is used.
That is, in accordance with the material for forming the skin body layer 35, polyolefin, polystyrene, polyvinyl chloride,
Polyester, polyamide, urethane, chlorinated P
Paints such as E can be used.

Subsequently, the first skin body layer 3 on the instrument panel body side is provided on the back side (the lower side in FIG. 4) of the design / protection layer 28.
5 and the second skin body layers 36 on the door portion side are formed.

In the first step of the spray molding, the first mask jigs 32, 32 are arranged so that the mask boundary coincides with the formation site of the second weak line portion 21 (the site corresponding to the tear line 17).
To form the first skin body layer 35 on the panel body side by spray molding on the non-masked part.

As the second step of spray molding, after the first skin main body layer 35 formed in the first step is semi-cured or cured, the second mask jig 33 masks the panel body side to form the first mask. One of the jigs 32 is removed, and the second skin body layer 36 on the door side is formed on the non-masking portion by spray molding.

As a third step of spray molding, after the second skin body layer 36 formed in the second step is semi-cured or hardened, the first mask in which the second skin body layer 36 has been removed in the second step. In a state where the mask is masked by the jig 32 (while the panel main body side is masked by the second mask jig 33), the other first mask jig 32 is removed, and the other non-masked portion is formed by spray molding on the other side of the door. The second skin body layer 36 is formed. Then, the mask jigs 32 and 33 are removed,
All the skin body layers 35, 36 are cured.

When polyurethane is used as the spray molding material for the skin body layer, the heat curing conditions are as follows:
For example, the temperature is set to 50 to 70 ° C., preferably about 60 ° C.

Here, the joint state of the joints can be adjusted by adjusting the respective spray molding times of the second skin main body layers 36, 36. That is, when the first skin main body layer 35 is semi-cured and the second skin main body layers 36 and 36 are formed by spray molding, the joint (fusion strength) of the seam is strong. Welding strength) is low. It is appropriately selected according to the required joint strength of the joint (required breaking performance of the skin layer).

In the above, in order to prevent the seam from being fused, a step of applying a release agent to at least the seam forming end face of the first skin main body layer 35 after spray forming the first skin main body layer 35. Through the second epidermis body layer 3
Spray-mold 6,36.

The second skin body layer (door side) 36,
Of course, the first skin main body layer (main body side) 35 may be formed later by spray molding alternately first.

The material of the first and second mask jigs 32 and 33 is not particularly limited as long as the material can be masked. However, even if the design / protection coating film 28 is in a semi-dry state, the design / protection coating film may be used. It is desirable to use a material that does not stick to 28. For example, non-polar plastics such as PP and PE can be used.

The spray molding materials for the first and second skin main body layers 35 and 36 may be different kinds of elastomer materials, but usually the same elastomer material is used. For example, use a polyurethane material suitable for spray molding, but use polyolefin, polystyrene, polyvinyl chloride, polyester, polyamide, chlorinated PE
Elastomer prepolymers and the like can be used. When polyurethane is not used, a polyolefin-based elastomer is particularly preferred from the viewpoint of the environment and the viewpoint of weight reduction. The first skin main body layer 35 and the second skin main body layer 36.
When the molding materials of 36 are made of different materials, the bonding strength (joining strength) between the joints can be adjusted by selecting an appropriate material.

The thickness of each of the skin main body layers 35 and 36 is about 0.6 to 1.0 mm, preferably about 0.8 mm. If it is too thin, it is difficult to obtain a sufficient soft touch, and if it is too thick, the thickness of the foam layer becomes relatively thin, which leads to an increase in the weight of the instrument panel as a whole.

FIG. 5 shows the first and second mask jigs.
As shown in (A) and (B), the edge is a skin layer (skin body layer)
35A (35B) may be shaped to be thinner.
FIG. 5 shows only a main part (seam part).

In FIG. 5, the first mask jig 32A (or 3
The back side of the edge of 2B) is a part cut off at a right angle on the contact side with the design / protective coating film 28. When masking is performed with the first mask jig 32A (or 32B) and the first skin main body layer forming material is spray-coated, the first skin main body layer forming material flows and the notch portion of the first mask jig 32A. Penetrates and hardens. Therefore, the first skin body layer 35A
A thin portion is formed near the joint (second weak line portion) 38A (or 38B) of (or 35B).

Subsequently, a second mask jig 33A (or 33B) provided with a projection capable of masking the whole (FIG. 5 (A)) or a part (FIG. 5 (B)) of the thin portion is provided at the edge. The second skin layer forming material 36A (or 36B) having a thin portion can be formed by spray-coating the second skin layer forming material using the material.

As described above, if the first mask jig 32A (or 32B) and the second mask jig 33A (or 33B) are used, the second weak line portion (seam) is formed at the same time when the skin body layers 35 and 36 are formed. ) A thin portion can be formed in the first skin main body layer 35 near 21, and the second weak line portion 2 of the skin layer 14 can be formed.
1, it is easier to secure the breakability (tearability),
As a result, the opening characteristics of the bag door can be improved.

When the thin portion is formed, the thickness of the thin portion 35a (or 35b) in the first skin main body layer 35A (or 35B) depends on the breaking performance (bag development) required for the skin layer 14A (or 14B). It is set appropriately according to the performance and the barrier property against the foamed layer.

The shapes of the first and second mask jigs are not limited to those shown in the drawings, and various other shapes may be used as long as a thin portion can be formed on the first skin body layer. be able to.

For example, with the flat H-shaped thin wall body (three-dimensional mask jig) corresponding to the tear line set on the design / protection layer or the mold cavity surface, the skin main body layer (or skin layer) is sprayed. Molding. Then, if the three-dimensional mask jig is removed in an uncured state in which fluidity still remains in the skin main body layer (or the skin layer), the skin main body layer (or the like) is closed so as to close the gap formed by the three-dimensional mask jig. Or the skin layer) material is closely fused to form a second fragile line portion consisting of a seam.

(2) Another method of forming a skin layer according to the present invention is to form the skin layer 114 (or 114A) of the instrument panel 10 by spray molding.
The groove 40 (or 40A) is formed to form the second fragile line portion 21 when A) is not cured.

As a means for forming the groove 40 (or 40A), a method using a convex pressing jig 42 as shown in FIG.
In addition, there is a method of locally injecting a fluid such as hot air or cold air (or water) from the fluid ejector 44 to promote the hardening of the skin layer, that is, the skin body layer 37A.

The temperature of the ridge pressing jig and the type and temperature of the fluid used for the fluid ejecting means are changed according to the type of the skin layer forming material. That is, when the skin layer forming material is a thermosetting polymer base, a heated ridge pressing jig or hot air or a hardening agent (for example, an active hydrogen compound in the case of polyurethane) is used. It is desirable to quickly fix the groove shape using a cooled ridge pressing jig or cold air (or water).

In addition to the above-mentioned means, it is possible to use ultrasonic waves, high-frequency waves, etc., but these require expensive equipment.

In the present embodiment, the groove 40 of the skin layer 37 to be formed is usually continuous (linear), but may be intermittent (perforated). Also, grooves (recesses) 40 and 40A
Is not limited to a V-shape as shown in the figure, but a U-shape.
It may be rectangular or the like.

When the skin layer forming material is a urethane material, the temperature of the hot air is about 50 to 100 ° C., preferably 7 to 100 ° C.
0 ° C.

The depth of the groove 40 (40A) is the same as described above.
It is set appropriately according to the breaking performance (bag deployment performance and barrier property against the foamed layer) required for the skin layer.

(3) Still another method of forming a skin layer according to the present invention, as shown in FIG. 8, is to form a fragile processing portion (a U-shaped notch portion) when spray forming the skin layer 214 of the instrument panel 10 having the above configuration. A) sheet-like reinforcement 46 with 48)
Is embedded and molded to form a second fragile line portion.

That is, the sheet-like reinforcing member 46 (FIG. 9) on which the brittle processing portion 48 was formed was placed on the skin layer forming mold 29 on which the design / protective coating film 28 was formed, and the reinforcing member 46 was placed thereon. In this state, the skin layer forming material is spray-formed to form the skin main body layer 39.

In the illustrated example, the bag door is one-sided, and the cutout 48 is substantially U-shaped in plan view.

The mode of the fragile processing section is not limited to the notch section 48. For example, a cut portion, a thermally degraded portion, or a fragile adhesion portion corresponding to a tear line shape may be formed on a sheet (flexible plate) or a net.

Then, after the skin layer 14 and the like are formed by spraying, the skin layer forming mold 29 with the skin layer remaining (not released) is used as a female mold, not shown, as in the prior art. The mold for forming the base material layer, which is used for forming the material layer and the base material layer remains (not released), is used as a male mold, and after closing the mold, the foam layer material is injection-molded. As shown, an instrument panel 10 consisting essentially of a base material layer 13, a foam layer 16 and a skin layer 14 is manufactured.

The instrument panel 10 is used with an airbag device M assembled and mounted on an actual vehicle.

The airbag device M basically comprises an airbag 52, an inflator 54 for inflation gas flowing into the airbag 52, and a bag case 56 for integrating those members. The bag case 56 holds the inflator 54, and a diffuser can 58 that guides the inflation gas flow into the airbag 52 is integrated with the airbag 52.

The front and rear walls 56 of the bag case 56
The front and rear mounting walls 23 and 25 formed on the back surface of the base material layer 13 are inserted into and engaged with a and 56b to form an airbag device assembly, which is mounted on a vehicle body (actual vehicle) via a bracket (not shown).

When an impact load of a predetermined value or more is applied to the vehicle body, the tear line 17 of the bag cover 12 is broken as described below, the door is opened, and the airbag is quickly inflated / deployed.

First, when the airbag body 52 is inflated,
The base material layer 13 is pressed from the back side (lower part). At this time, the first fragile line portion 19 in which the V-shaped cutout of the base material layer 13 is formed.
After the first weak line portion 19 formation site is broken, the stress concentrates on a portion (minimum cross-section portion) of the foam layer 16 where the distance from the bottom of the second weak line portion 21 is shortest, The crack line in the longitudinal direction is the second weak line portion 21 (seam or groove etc.)
Run towards the tip of the. The tip of the crack line is the second weak line portion 2 of the skin layer 14 (skin body layers 35 and 36).
1, the second fragile line portion 21 of the skin layer 14 is fragile compared to the other skin layers 14, so that stress is concentrated and the amount of elongation of the skin layer 14 is reduced to the original value. The skin layer 14 breaks (tears) long before the elongation (%) is reached. Therefore, even without a relief line,
Even if the fragile line portion is not formed by a special post-treatment using a laser or the like, the skin layer does not extend and the completely open state of the bag door portion is not delayed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an instrument panel (instrument panel) as an example of an automobile interior component to which the method of the present invention is applied.

FIG. 2 is a sectional view of a main part taken along line 2-2 in FIG. 1;

FIG. 3 is a plan model diagram showing an arrangement relationship of a mask jig in a method of forming a skin layer of an automobile interior product according to one of the present invention.

FIG. 4 is a process end view (4 in FIG. 3) in the case where a second fragile line portion formed of a seam is formed on the skin layer by the same mask jig.
-4 line position)

FIG. 5 is a process cross-sectional view when forming a second weak line portion when another mask jig is used (only a joint position portion).

FIG. 6 is a cross-sectional view of a model in which a groove constituting a second weak line portion formed of a groove is formed in a skin layer using a convex pressing jig.

FIG. 7 is a cross-sectional view of a model in the case where a groove constituting the second line of weakness is formed by local injection of a fluid.

FIG. 8 is a cross-sectional view of a model in which a second fragile line portion is formed on a skin layer using a sheet-like reinforcing material having a fragile treatment portion.

9 is a model plan view of the sheet-like reinforcing member in FIG.

[Explanation of symbols]

12 Instrument panel (automobile interior parts) 14, 14A, 14B, 114, 114A, 214 Skin layer 19 First weak line portion 21 Second weak line portion 28 Design / protective layer (design / protective coating film) 32 First mask Jig 33 Second mask jig 35, 35A, 35B First skin main body layer 36, 36A, 36B Second skin main body layer 38 Seam 40 Groove 42 Convex pressing jig 44 Fluid ejector 46 Sheet reinforcing material

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) B29C 41/22 B29C 41/22 B29L 31:58 B29L 31:58 (72) Inventor Hiroshi Suyama Nishi-Kasugai-gun, Aichi Prefecture (1) Nagata, Kasuga-machi, Ochiai-gai, Toyoda Gosei Co., Ltd. (72) Inventor Tatsuo Yamada, 1-Daigachi, Ogai-gai, Kasuga-cho, Nishi-Kasugai, Aichi No. 1, Nagahata, Ochimachi, Toyoda Gosei Co., Ltd. (72) Inventor Akira Nakajima 2192-30 Mitakacho, Mitake-cho, Kani-gun, Gifu Prefecture Tokai Kasei Kogyo Co., Ltd. 2192-30 Tokai Kasei Kogyo Co., Ltd. F-term (reference) 3D044 BA11 BB01 BC03 BC13 3D054 AA14 BB09 BB23 FF02 FF17 FF18 4F205 AD11 AF10 AG21 AH25 AH26 GA05 GB01 GB13 GB19 GB27 GC04 GF03 GF25 GF46 GN11

Claims (12)

[Claims] 1. A method of forming a skin layer of an automotive interior product having an airbag cover portion and having a vertical cross section including a base material layer and a skin layer by spray molding, wherein the tear line of the airbag cover portion is formed by spray molding. It is composed of a first weak line portion formed on the base material layer and a second weak line portion formed on the skin layer. In the spray molding, a seam is generated by a multi-stage spray process to form the second line. A method for forming a skin layer of an automobile interior part, comprising forming a fragile line portion. 2. The method according to claim 1, wherein the spraying step is performed using a masking jig. 3. The method according to claim 2, wherein a groove is formed along the second line of weakness. 4. A spray molding method (in-m
4. The method for forming a skin layer of an automobile interior component according to claim 1, wherein the decorating is applied. 5. The method for forming a skin layer of an automobile interior part according to claim 1, further comprising a step of applying a release agent to an end face of the seam between the plurality of spraying steps for generating the seam. . 6. A method of forming a skin layer in an automotive interior product having an airbag cover portion and having a vertical section including a base material layer and a skin layer by spray molding, wherein a tear line of the airbag cover portion is formed. It comprises a first line of weakness formed in the base material layer and a second line of weakness formed in the skin layer. In the spray molding, the groove is formed when the skin layer is not cured. A method for forming a skin layer of an automobile interior part, comprising forming a second fragile line portion. 7. The method for forming a skin layer of an automobile interior part according to claim 6, wherein the shaping of the groove is performed by using a ridge pressing jig. 8. The method for forming a skin layer of an automobile interior product according to claim 7, wherein the shaping of the groove is performed by locally spraying a fluid for accelerating the curing of the skin layer. 9. The method for forming a skin layer of an automobile interior part according to claim 6, wherein a painting molding method is applied to said spray molding. 10. A method of forming a skin layer in an automotive interior product having an airbag cover portion and having a vertical cross section including a base material layer and a skin layer by spray molding, wherein a tear line of the airbag cover portion is formed. It is composed of a first line of weakness formed in the base material layer and a second line of weakness formed in the skin layer. At the time of the spray molding, a sheet-like reinforcing material having a fragile treatment portion is embedded. A method for forming a skin layer of an automobile interior part, wherein the second weakened portion is formed by molding. 11. An automobile interior part having an airbag cover part, wherein a skin layer of the airbag cover part is integrally formed by spray molding including a skin layer of an interior part main body part, An automobile interior product characterized in that a skin layer has a seam corresponding to a tear line (a portion to be broken). 12. The automobile interior product comprises a skin layer, a base material (core material) layer, and a foam layer disposed between the base material layer and the skin layer. Claim 11
Automotive interior goods as described.