JP5719786B2 - Manufacturing method for automobile interior parts and skin materials for automobile interior parts - Google Patents

Description

  The present invention relates to a door trim, a console box, an instrument panel, a glove box lid, a pillar garnish and other automobile interior parts. The present invention also relates to a method for producing a skin material for automobile interior parts.

Since automobile interior parts such as door trims have many opportunities to be touched by the body of the passenger, good touch feeling and cushioning properties are required. Also, automobile interior parts are required to have a considerable rigidity.
Thus, many automobile interior parts employ a structure in which a skin material having flexibility is joined to a core material having rigidity.
That is, a core material having rigidity and a skin material having an outer shape preliminarily formed into a shape such as a door trim and having flexibility are individually manufactured, and both are joined and integrated in a later process.

Here, the skin material is required to have a good touch feeling as described above and to have cushioning properties, and thus has a two-layer structure having a solid layer on the front surface side and a cushion layer on the back surface side. There are many things.
As described above, as a method for forming a skin material preliminarily formed into a door trim or the like and having a solid layer and a cushion layer, a method by slush molding and a method by vacuum forming are known.

Here, the skin material by slush molding is used for automobile interior parts of high-end cars because the number of steps in manufacturing is large and the raw materials are expensive.
For relatively inexpensive automobiles, a skin material by vacuum forming is often employed.

A method for manufacturing a skin material by vacuum forming will be briefly described as follows.
That is, the manufacture of a skin material for automobile interior parts by vacuum forming is roughly divided into a sheet manufacturing process and a forming process.
The sheet manufacturing process is a process for manufacturing a two-layered sheet having a solid layer on the front surface side and a cushion layer on the back surface side.
In this step, a long and flat sheet is produced by known calendar molding or extrusion molding. That is, a raw material is manufactured. Then, the manufactured long sheet is cut into a standard length of about 2 meters.

In the molding process, a standard sheet is heated and softened, placed on the male mold, and air between the sheet and the male mold is sucked from the surface of the male mold to adhere the standard sheet to the male mold. . Thereafter, the sheet is cooled and solidified, and the sheet is removed from the male mold.
Further, by cutting off a portion other than necessary (trim process), a skin material that is preformed into a door trim or the like and that includes a solid layer and a cushion layer is obtained.

JP-A-8-207572

As described above, the skin material obtained by vacuum forming can be manufactured at a lower cost than the skin material by slush molding. However, the market demands cheaper and higher quality automobile interior parts.
Then, when the present inventors examined the problem of the skin material obtained by vacuum forming, the following point was mentioned.
A problem associated with the manufacturing process is that many parts of the sheet are cut off and discarded by the trimming process. That is, the production of the skin by vacuum forming has a poor yield.

Specifically, in vacuum forming, a flat sheet heated and softened is placed on a male mold, and a vacuum is drawn between the two. Therefore, it is necessary to firmly clamp the sheet in a male shape so that air does not leak, and a margin for clamping on the side of the sheet is necessary. In order to prevent air from leaking, a certain amount of cushioning area must be provided between the molded part to be the product and the clamped part.
The clamping margin area and the buffer area are removed by the trimming process. Therefore, the production of the skin by vacuum forming has a poor yield.
Further, since the removed sheet is a laminate of different materials, it is difficult to reuse and must be discarded. Therefore, the production of the skin by vacuum forming has a problem to be improved in terms of effective use of resources.

Further, as a performance problem, there is a problem that the touch feeling and the cushioning property are uniform.
Taking the door trim as an example, the wall surface on the upper side has many chances of being touched by fingers, so that it is necessary that the touch feeling and cushioning properties are good. On the other hand, the lower wall surface corresponding to the foot only has the foot and knee hit through trousers and the like, and there is little opportunity to directly touch the human skin. Therefore, a feeling of touch and cushioning are not necessary, but rather the rigidity of the skin itself is required.
The same applies to the instrument panel. In the vicinity of the driver's seat and the passenger seat, there are many opportunities for the fingers to hit, so it is necessary that the feel and cushioning are good. On the other hand, in the vicinity of the windshield, there are very few opportunities for humans to touch, and a touch feeling and cushioning properties are unnecessary.

On the other hand, since the skin material manufactured by vacuum forming is given a touch feeling and cushioning properties depending on the surface layer and the cushion layer of the sheet warping itself, these cannot be partially changed.
In addition, the skin material manufactured by vacuum forming has a problem that the corner portion is in a deep drawing state and the thickness becomes thin.

  Accordingly, the present invention focuses on the above-mentioned problems of the prior art, and an object of the present invention is to provide an automobile interior product that has a good yield and has a change in feel and cushioning properties. The present invention also proposes a method for manufacturing the skin of the automobile interior part.

The invention according to claim 1 for solving the above-mentioned problem is an automotive interior comprising a core material having rigidity and a skin material covering the surface of the core material, wherein the skin material is injection molded or reacted. It is formed by injection molding, has a skin layer on the front surface side, and has a concavo-convex portion with concavo-convex formed on the back side, and the concavo-convex portion has a different shape and / or distribution of concavo-convex depending on the part. The car interior product is a door trim having an elbow rest, further comprising an upper side wall constituting the upper side of the elbow rest and a lower side wall constituting the lower side of the elbow rest, the skin material The unevenness on the back side of the vehicle interior product is characterized in that the height of the upper side wall portion is lower than that of the elbow rest portion, and the lower side wall portion is lower than that of the upper side wall portion .

The automobile interior product of the present invention uses a skin material formed by injection molding or reaction injection molding (RIM molding). Therefore, a clamp area and a buffer area do not occur in the intermediate product during production, and the yield is high.
In the automobile interior product of the present invention, there is an uneven portion formed with unevenness on the back surface side of the skin material, and the cushioning property is secured by the uneven portion.
Moreover, since the uneven | corrugated | grooved part differs in the shape of an unevenness | corrugation etc. with a site | part, a touch feeling and cushioning properties change with sites. Therefore, it is possible to give a high-class feeling compared to automobile interior parts by vacuum forming.
The “concave / convex shape” is a planar shape or a three-dimensional shape of the unevenness, and includes cases where the size of the individual unevenness is different. Even in the case of a cylindrical shape, it can be said that the “uneven shape” is different if the height is different, and the “uneven shape” is different even if the cross-sectional diameters are different. Of course, when the silhouette is a conical shape, a quadrangular prism shape, or a cylindrical shape, the “uneven shape” is different.
The distribution means, for example, the number per unit area or the degree of dispersion.

The automobile interior part of the present invention is a door trim.
According to the present invention, the uneven shape (specifically, height) on the back surface side of the skin material is different depending on the part, the elbow rest is the highest, the upper side wall is next higher, and the lower side wall is the lowest.
For this reason, the elbow rest is the softest part of human contact, the upper side wall is moderately hard and the lower side wall is less likely to come into direct contact with human skin. The part is hard.

  The invention according to claim 2 is the automobile interior part according to claim 1, wherein the thickness of the skin layer differs depending on the part.

  According to the present invention, a significant difference can be provided depending on the feel and cushioning properties.

  The invention according to claim 3 is the automobile interior part according to claim 1 or 2, wherein the height of the unevenness is lower than the thickness of the skin layer.

  According to the present invention, since the height of the unevenness is lower than the thickness of the skin layer, when the surface is touched, the unevenness is not felt.

According to a fourth aspect of the present invention, there is provided a door trim skin comprising an elbow rest, an upper side wall constituting the upper side of the elbow rest, and a lower side wall constituting the lower side of the elbow rest. the wood, a method of manufacturing by injection molding or reaction injection molding using a mold, and irregularities are provided on the molding surface for molding the molds, the relief, the by regions of the molding surface There is a difference in the shape and / or distribution of unevenness, the height of the unevenness is lower in the upper side wall part than in the elbow rest, and further lower in the lower side wall part than in the upper side wall part, A method for producing a skin material for automobile interior parts, comprising injecting a resin raw material into a mold, solidifying the raw material resin in the mold, and then removing the mold.

  According to the present invention, it is possible to produce a skin material having a change in hardness or the like depending on a part with a high yield.

  The automobile interior product of the present invention can be manufactured with high yield, and the feel and cushioning properties vary depending on the part. Moreover, the manufacturing method of this invention can manufacture efficiently the skin material of the above-mentioned automotive interior goods.

It is a perspective view of the door trim of the embodiment of the present invention. It is sectional drawing of the door trim of FIG. FIG. 2 is an exploded cross-sectional view of the door trim of FIG. 1. It is a disassembled perspective view which shows the structural member of the door trim of FIG. 1, and observes the door trim of FIG. 1 from the back side. It is an expanded sectional view of the skin material of the door trim of FIG. FIG. 2 is an enlarged cross-sectional perspective view of the skin material of the door trim of FIG. 1, and the skin material is observed from the back side. It is explanatory drawing which shows the upper side wall part of the door trim of FIG. It is explanatory drawing which shows the elbow rest part of the door trim of FIG. It is explanatory drawing which shows the lower side wall part of the door trim of FIG. It is explanatory drawing which shows the back vertical side wall and front side wall surface of the door trim of FIG. (A) (b) is sectional drawing explaining the effect | action of the door trim of FIG. It is an expanded sectional perspective view which shows other embodiment of a skin material, and observes a skin material from the back surface side. It is an expanded sectional perspective view which shows other embodiment of a skin material, and observes a skin material from the back surface side. It is sectional drawing of the reaction injection mold which shows 1 process of the manufacturing method of the skin material for motor vehicle interior goods of this embodiment.

Embodiments of the present invention will be further described below.
FIG. 1 shows an automobile interior part according to an embodiment of the present invention, and more specifically, a door trim 1.
As shown in FIGS. 2, 3, and 4, the door trim 1 is obtained by bonding a skin material 3 to the surface of a core material 2.
The core material 2 is made by injection molding using a thermoplastic resin such as polypropylene resin (PP resin) or ABS resin as a raw material, and is hard and has considerable rigidity. That is, the core material 2 can maintain the posture independently.

  The skin material 3 is manufactured by injection molding using a thermoplastic resin as a raw material or reaction injection molding using a thermosetting resin such as a urethane resin as a raw material, and has flexibility. That is, the skin material 3 is a sheet preformed to the appearance of the door trim 1, and does not have rigidity, and cannot maintain its original posture by itself.

As shown in FIG. 5 and FIG. 6, the skin material 3 has a skin layer 10 on the front surface side and a concavo-convex portion 11 in which ruggedness is formed on the back surface side.
The skin layer 10 is a dense layer and is a substantially non-foamed layer.
As shown in FIG. 6, the concavo-convex portion 11 is a portion where cylindrical small protrusions 12 are provided at a constant pitch, and functions as a cushion layer.
When the thickness T of the skin layer 10 and the height t of the small protrusion 12 are compared, the thickness T of the skin layer 10 is larger than the height t of the small protrusion 12.
In other words, the skin material 3 has an uneven portion 11 that functions as a skin layer 10 and a cushion layer, but the thickness T of the skin layer 10 is thicker than the thickness t of the cushion layer.

In the present embodiment, the thickness T of the skin layer 10 and the height t of the small protrusion 12 are changed depending on the part.
7 to 10 are explanatory views for explaining a portion of the door trim 1.
As shown in FIGS. 1, 7, 8, 9, and 10, the door trim 1 has a wall shape as a whole. And the elbow rest part 20 is provided in the center part (refer FIG. 8).
The elbow rest portion 20 is a portion that protrudes toward the vehicle inner side with respect to the wall surface. The upper surface 21 of the elbow rest portion 20 is substantially horizontal when the door trim 1 is attached to an automobile.
The upper surface 21 of the elbow holder 20 is a part where the elbow of a driver or the like comes into contact.
The side surface 18 of the elbow rest 20 is gently inclined.

  As described above, the elbow rest portion 20 is provided in the central portion of the door trim 1, and the upper side wall portion 22 in a substantially vertical posture on the upper side of the elbow rest portion 20 (based on the posture attached to the automobile). There is. The upper side wall portion 22 is at a height from the elbow to the shoulder of the rider, and there are many opportunities to touch the arm and shoulder. In other words, there are many opportunities to directly touch human skin. The upper side wall portion 22 is provided with a handle 23 for opening and closing the door.

  Further, on the lower side of the elbow rest portion 20, there is a lower side wall portion 25 in a substantially vertical posture. The lower side wall 25 is at the height from the belly to the foot of the rider and there is an opportunity for a person to touch, but in many cases, the contact is through clothing and the opportunity for the person's skin to touch directly Few. A speaker 26 is provided on the lower side wall portion 25.

  Further, a rear vertical side wall 27 is provided on the rear vertical side surface. The rear vertical side wall 27 is a part which is located on the rear side and constitutes an end side when the door is opened and closed when attached to the automobile. The rear vertical side wall 27 is a part that comes into contact with the door frame when the door is closed.

  Moreover, when attached to a motor vehicle, there is a front side wall surface 30 at a portion located on the front side. The front side wall surface 30 is a part facing the side surface of the instrument panel when the door is closed, and there are very few opportunities for people to touch it.

As described above, the door trim 1 is roughly divided into the elbow rest portion 20, the upper side wall portion 22, the lower side wall portion 25, the rear vertical side wall 27, and the front side wall surface 30, and the thickness T of the skin layer 10 and the small protrusions. The height t of 12 is changed for each of the sections.
That is, the opportunity for human skin to touch is different for each section. Therefore, in the door trim 1 of the present embodiment, the height t of the small protrusion 12 is increased to increase the soft feeling in the part where the human skin is frequently touched, and the height t of the small protrusion 12 is the part where the human touch is small. Or the small protrusion 12 itself is eliminated to increase the rigidity of the skin material 3.

  The thickness T of the epidermis and the height t of the small protrusion 12 for each part are as shown in the following table.

In the door trim 1 of the present embodiment, the elbow rest 20 that has the highest chance of being touched by human skin increases the height t of the small protrusion 12 to enhance cushioning. Further, the elbow rest 20 has a thinner skin material 3 than other parts.
That is, when a human elbow (not shown) contacts the upper surface 21 of the elbow rest 20 of the door trim 1, the small protrusion 12 is compressed and deformed, and the small protrusion 12 of the skin material 3 is as shown in FIG. It will be in the state shrunk like FIG.11 (b) from a natural state, and the surface of the skin material 3 will sink entirely. Therefore, the user feels softness and cushioning.
The skin layer 10 on the surface of the skin material 3 is a dense layer, substantially non-foamed, and the thickness T of the skin layer 10 is thicker than the height t of the small protrusions 12. It is difficult to deform itself.
On the other hand, since the concavo-convex portion 11 is a portion where the cylindrical small protrusions 12 are provided at a constant pitch, the stress applied to each small protrusion 12 is higher than the stress received by the skin layer 10. The small protrusion 12 is deformed and contracted by receiving a strong stress.
The skin layer 10 receives a force in the upward direction from the individual small protrusions 12. As described above, the thickness T of the skin layer 10 is thicker than the height t of the small protrusions 12. The surface does not wave or uneven.

  Similarly, when the person touches the upper side wall portion 22, the small protrusion 12 sinks, and the user feels softness and cushioning. However, the upper side wall portion 22 is smaller than the elbow rest portion 20. Since the height t is low, the softness and cushioning properties are low. However, instead, it can give the user a sense of rigidity.

  Similarly, when the person touches the lower side wall portion 25, the small protrusion 12 sinks, and the user feels softness and cushioning. However, the lower side wall portion 25 includes the elbow rest portion 20 and the upper side wall portion 22. Since the height t of the small protrusions 12 is lower than that, the softness and cushioning properties are low. However, instead, the user can be given a stronger sense of rigidity and feel a sense of stability.

On the other hand, the rear vertical side wall 27 and the front side wall surface 30 do not have the small protrusions 12, so that they do not feel softness or cushioning when touched by people, but these parts are less likely to be touched in the first place. Therefore, there is no particular adverse effect.
On the contrary, it is assumed that these areas are scratched by a strong contact such as an object being pinched or an object, but since the amount of deformation when the object hits is small, scratches and the like are unlikely to occur.

As described above, the door trim 1 according to the present embodiment is provided with the tall small protrusion 12 at a part where the person is likely to touch, and is provided with the short small protrusion 12 at a part where the person is unlikely to touch. The small protrusions 12 are omitted from the parts where the human touch is extremely rare.
As described above, it is desirable to appropriately change the portion where the small protrusion 12 is provided according to the property of the automobile interior product.
For example, when the present invention is adopted for an instrument panel, it is desirable to provide a small small protrusion 12 in the vicinity of the driver's seat and the passenger seat because there are many opportunities to hit with fingers. On the other hand, in the vicinity of the windshield, there is very little opportunity for human touch, and a touch feeling and cushioning properties are unnecessary. Therefore, a small small protrusion 12 is provided or the small protrusion 12 is omitted.

The height when the small protrusions 12 are provided is not limited, but is preferably a height exceeding 0.05 mm and not more than 1.5 mm.
That is, when the height of the small protrusion 12 is 0.05 mm or less, it is difficult to feel cushioning properties even if a person touches it. In addition, when the height of the small protrusion 12 is 0.05 mm or less, an uneven shape may appear on the surface. On the other hand, when the height of the small protrusion 12 exceeds 1.5 mm, the small protrusion 12 may be buckled, and there is a concern that a feeling of hip folding may occur.
The recommended range of the height of the small protrusion 12 is 0.2 mm to 0.9 mm. The most recommended range is from 0.3 mm to 0.8 mm.

  In addition, it is recommended that the height of the small protrusion 12 be less than 3 times, more desirably less than 2 times the cross-sectional diameter, for the purpose of preventing the above-described buckling. Considering the area ratio, it is recommended that the height of the small protrusion 12 be less than 3 times, more desirably less than 2 times the square root of the area.

The absolute value of the cross-sectional diameter of the recommended small protrusion 12 is 0.3 mm to 1 mm, and the more recommended range is 0.5 mm to 0.8 mm.
That is, when the cross-sectional diameter of the small protrusion 12 is large, the small protrusion 12 is difficult to compress and deform, and the cushioning property is inferior.
On the other hand, when the cross-sectional diameter of the small protrusion 12 is 0.3 mm or less, the push-up stress from the small protrusion 12 side to the skin layer 10 side becomes high, and an uneven pattern may be raised on the surface of the skin layer 10. is there.

  Further, the distribution ratio of the small protrusions 12 should be changed according to the requirement of cushioning properties, but the ratio of the small protrusions 12 per unit area is preferably about 1/4 to 4/5. . That is, the proportion of the small protrusions 12 (the proportion of the convex portion) may be larger than the other portion (the proportion of the concave portion).

  The shape of the small protrusion 12 is not limited to a cylindrical shape, but a conical shape such as the small protrusion 35 shown in FIG. 12, a truncated cone shape, or a small protrusion 36 shown in FIG. It may be an irregular shape.

The manufacturing method of the skin material 3 is based on injection molding or reaction injection molding.
More preferably, the skin material 3 is manufactured by reaction injection molding.
That is, as shown in FIG. 14, the RIM mold 37 is used, and the mixed raw material is injected from the mixing head 40 into the cavity 38 of the RIM mold 37.
That is, the RIM mold 37 is constituted by a lower mold 42 and an upper mold 43 as shown in FIG. 14, and a molding cavity 38 is formed between them.
In the present embodiment, the surface of the lower mold 42 molds the surface side of the skin material 3, and the surface of the upper mold 43 molds the back surface side of the skin material 3.
Therefore, in this embodiment, there is an unevenness (not shown) for forming the small protrusion 12 on the cavity surface of the upper mold 43.

Then, as shown in FIG. 14, the mixed raw material is injected from the mixing head 40 with the lower mold 42 and the upper mold 43 closed. The raw material to be injected is, for example, a mixture of polyisocyanate and polyol, and the raw material advances the urethane reaction inside the RIM mold 37 and is cured (solidified). Thereafter, the lower mold 42 and the upper mold 43 are opened, and the skin material 3 is removed.
Further, the cover material 3 is bonded to the core material 2 separately prepared, and the core material 2 is covered with the skin material 3, thereby completing the door trim 1.

  In the embodiment described above, the skin material 3 is manufactured by reaction injection molding using a urethane resin as a raw material, but a thermoplastic resin such as a vinyl chloride resin (PVC resin) or a thermoplastic olefin resin (TPO resin) is used as a raw material. The skin material 3 may be manufactured by injection molding.

As an example of the present invention, a door trim skin material 3 in which the thickness T of the skin layer 10 and the thickness of the concavo-convex portion 11 (height t of the small protrusion 12) are different was formed. The raw material used was PVC, and the manufacturing method was injection molding. The barrel temperature at this time was 180 degrees Celsius, and the mold temperature was 60 degrees Celsius.
As a comparative example, a skin material having no small protrusions 12 was molded. These skin materials were attached to the core material 2 to complete the door trim.

And the surface hardness of each door trim was measured. The measurement of hardness was based on JIS G0202, Rockwell hardness, and the hardness by C scale was measured.
The results are shown in the following table.

As a result, the skin material (Example) having the small protrusions 12 had a lower surface hardness and was softer than the skin material (Comparative Example) that did not have the small protrusions 12. From this point, it can be seen that the skin material (Example) having the small protrusions 12 is excellent in cushioning properties.
Moreover, as the shape of the small protrusion 12, a cylindrical shape and a conical shape were prototyped, and it was found that an improvement in cushioning properties was observed in both cases.

Further, when attention is paid to the thickness T of the skin layer 10 and the thickness of the concavo-convex portion 11 (height t of the small protrusions 12), those having the same thickness tend to have undulations on the surface.
From this point, it can be said that the thickness T of the skin layer 10 is desirably thicker than the thickness of the uneven portion 11 (the height t of the small protrusion 12).

As a second example, an instrument panel skin material having a different thickness T of the skin layer 10 and different thicknesses of the concavo-convex portions 11 (height t of the small protrusions 12) was molded. In addition, the raw material used urethane and the manufacturing method was based on reaction injection molding. The raw material temperature at this time was 40 degrees Celsius for both polyisocyanate and polyol. The temperature of the RIM mold 37 was 37 degrees Celsius.
As a comparative example, a skin material having no small protrusions 12 was molded. By attaching these skin materials to the core material, an instrument panel was completed.

And the surface hardness of each instrument panel was measured. The measurement of hardness was based on JIS G0202, Rockwell hardness, and the hardness by C scale was measured.
The results are shown in the following table.

  As a result, even when the instrument panel is used as an example, the skin material (example) having the small protrusion 12 has a lower surface hardness and is softer than the skin material (comparative example) having no small protrusion 12. Met. From this point, it can be seen that the skin material (Example) having the small protrusions 12 is excellent in cushioning properties.

When attention is paid to the thickness T of the skin layer 10 and the thickness of the concavo-convex portion 11 (height t of the small protrusions 12), the concavo-convex portion 11 is larger than those having the same thickness and the thickness T of the skin layer 10. When the thickness (height t of the small protrusion 12) is thicker, the surface tends to be uneven.
From this point, it can be said that the thickness T of the skin layer 10 is desirably thicker than the thickness of the uneven portion 11 (the height t of the small protrusion 12).
On the other hand, even when the thickness of the concavo-convex portion 11 (height t of the small protrusions 12) was extremely small, there was a tendency for the surface to be uneven.
From this point, it is recommended that the thickness of the concavo-convex portion 11 (the height t of the small protrusion 12) is more than 0.05 mm.

DESCRIPTION OF SYMBOLS 1 Door trim 2 Core material 3 Skin material 10 Skin layer 11 Uneven part 12 Small protrusion 20 Elbow rest part 21 Upper surface 22 Upper side wall part 25 Lower side wall part 27 Back vertical side wall 30 Front side wall surface 35 Small protrusion 36 Small protrusion

Claims (4)

In an automotive interior comprising a core material having rigidity and a skin material covering the surface of the core material, the skin material is formed by injection molding or reaction injection molding, and a skin layer is formed on the surface side. Yes, there is uneven portion which irregularities are formed on the back surface side, the uneven portion is all SANYO having a different shape and / or distribution of unevenness by site,
The automotive interior product is a door trim having an elbow rest, and further includes an upper side wall constituting the upper side of the elbow rest and a lower side wall constituting the lower side of the elbow rest, and the back surface of the skin material The interior of the vehicle is characterized in that the unevenness on the side is lower in the upper side wall than in the elbow rest, and lower in the lower side than the upper side .   2. The automobile interior part according to claim 1, wherein the skin layer has a different thickness depending on a part.   The automobile interior part according to claim 1 or 2, wherein the height of the unevenness is lower than the thickness of the skin layer. Injecting the skin material of the door trim, which is an automobile interior part having an elbow rest, an upper side wall constituting the upper side of the elbow rest, and a lower side wall constituting the lower side of the elbow rest using a mold a method of manufacturing by a molding or reaction injection molding,
Concavities and convexities are provided on the molding surface to be molded of the mold, and the irregularities have a difference in shape and / or distribution of the irregularities depending on the region of the molding surface.
The unevenness is lower in the upper side wall than in the elbow rest, and lower in the lower side than the upper side.
A method for producing a skin material for automobile interior parts, comprising pouring a resin raw material into the mold, solidifying the raw material resin in the mold, and then removing the mold.

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