JP7633675B2 - Automotive interior skin materials - Google Patents

Description

The present invention relates to an automobile interior skin material in which a perforated pattern is formed on synthetic leather that can be suitably used, for example, for seating.

Traditionally, various methods have been used to impart design features, and examples of decorative sheets with hole patterns include those used for automobile seats, automobile interior materials, clothing fabrics, and other covering materials, in which the surface is uneven, with the convex and concave portions being different colors. This involves a covering sheet made of a raised knitted or woven fabric with a pattern of discontinuous holes distributed on the back surface of the covering sheet, on which a base sheet of a different color is laminated and integrated with the covering sheet, the holes are recessed from the surface by the thickness of the covering sheet, and the bottoms of the holes are formed by the base sheet, creating a three-dimensional pattern on the decorative sheet. It is described that the contrast between the bottoms of the holes and the base surface due to the difference in color and material is clearer (Patent Document 1).

In addition, a decorative part is known that is a new design expression that cannot be expressed by stitching (decorative stitching) in which sewing thread is sewn into a skin material, and that includes a base material used in vehicle interior materials and a skin material laminated on the surface of the base material, in which a through hole is formed in the skin material that reaches the base material, and a recess with an opening that is continuous with the through hole is formed in the base material, and the inner surface of the recess is visible from the outside through the through hole. It is described that the surface of the decorative part has a portion that is covered with the skin material and a portion that is not covered with the skin material and exposes the inner surface of the recess provided in the base material, and that the difference in the surface properties of these two portions makes it possible to express a new design that cannot be obtained by applying stitching, etc. (Patent Document 2).

In addition, as a decorative member for a vehicle, for example, a skin provided on a door trim of a vehicle door to improve the design is partially attached to a base material. This decorative member includes a base material and a cover covering one side of the base material, and the cover is provided with a through hole that penetrates in the thickness direction and allows one side to be viewed, and a decorative part that reflects light differently from the design surface of the cover is provided in the part corresponding to the through hole. It is described that a change in the shape and area of the decorative part visible through the through hole can be recognized by the occupant as if the pattern on the design surface of the cover has changed (Patent Document 3).

Publication No. 7-45314 JP 2017-206139 A JP 2020-132117 A

However, in the decorative sheet of Patent Document 1, the bottoms of the holes drilled in the woven fabric mounting sheet become a three-dimensional pattern formed by the base sheet. In other words, although the contrast between the woven fabric and the base surface due to the difference in color and material becomes clearer, the mounting sheet is limited to one in which the bottoms of the holes are clearly visible.

In addition, although the decorative parts in Patent Document 2 can express new designs that cannot be obtained by stitching or the like due to differences in surface properties, they are limited to decorative parts in which the exposed inner surface of the recess provided in the base material is fully visible.

The decorative member of Patent Document 3 is known to have a decorative portion that reflects light differently from the design surface of the cover in the area corresponding to the through hole, and the shape and area of the decorative portion visible through the through hole can be changed to make the occupant perceive a change in the pattern of the design surface of the cover; however, the decorative member is limited to one in which the decorative portion is fully visible.

However, the decorative sheets, decorative parts, and decorative members of the above-mentioned conventional technologies had the problem that they needed to be large enough to see the bottom of the hole or the base material underneath the hole.

The present invention was made in consideration of this technical background, and aims to provide a skin material for automobile interiors that has excellent design properties not available in the prior art due to its skin material configuration.

To achieve the above objective, the present invention provides the following means:

[1] The skin material comprises a skin layer and a layer laminated on the back side of the skin layer,
the surface layer contains one or two resins selected from the group consisting of polyvinyl chloride resins and polyurethane resins,
the layers laminated on the back side of the skin layer are a resin layer and a fiber fabric layer, in that order, and the resin layer laminated on the back side of the skin layer is a layer containing one or two types of resin selected from the group consisting of polyvinyl chloride resins and polyurethane resins;
The fiber fabric layer is a tricot knit fabric,
a thickness t1 of the skin layer is 1/10 to 1/5 of a sum of a thickness t3 of the resin layer laminated on the back side of the skin layer and a thickness t2 of the fiber fabric layer laminated on the back side of the skin layer; and
The thickness t3 of the resin layer is 200 μm to 700 μm,
The thickness t2 of the fiber fabric layer is in the range of 200 μm to 1,500 μm,
the skin material has a plurality of punched cone-shaped holes penetrating from a skin layer on a front side of the skin material to a fiber fabric layer on a back side of the skin material,
The diameter d1 of the hole on the skin layer side is in the range of 0.8 mm to 1.5 mm ,
The side surface of the hole is visible from the skin layer side,
At least one of the surface layer, the resin layer, and the fiber fabric layer has a side surface of the hole that is a different color from any of the other layers;
The different color has a color difference from the surface layer of ΔE*=30 or more.

[2] The skin material for automobile interiors according to claim 1, wherein the cross-sectional color of the resin layer is different from the cross-sectional color of the skin layer, and the cross-sectional color of the fiber fabric layer is similar to the cross-sectional color of the resin layer.

[3] The skin material for automobile interiors according to claim 1, wherein a cross-sectional color of the skin layer, a cross-sectional color of the resin layer, and a cross-sectional color of the fiber fabric layer are different from one another.

In the invention of [1], the side of the hole penetrating the layer laminated on the back side of the skin layer can be seen from the specific type of skin layer, and the side of the hole includes a different color, so that a skin material for automobile interiors with excellent design not found in the prior art can be provided. In other words, the contrast and accent (emphasis) due to the different colors of the side of the hole, which cannot be expressed only by the multiple holes drilled and the arrangement or arrangement of the holes, are added, resulting in an excellent design. In particular, since it is sewn or molded to fit the shape of the seat, door, headrest, ceiling, instrument panel, etc. to form a three-dimensional shape, it is particularly effective on curved surfaces, and furthermore, combined with the respective effects of flat and curved surfaces, a skin material for automobile interiors with excellent design as a whole can be provided.

In the invention [1] , the layers laminated on the back side of the skin layer are, in that order, a resin layer and a fiber fabric layer, and the resin layer is between the skin layer and the fiber fabric layer. A skin material having the above-mentioned specific type of resin layer allows the side of the hole to be fully visible and increases the variety of different colors on the side of the hole, resulting in an even more excellent design.

The inventions [2] to [3] can provide even more variety by appearing in different colors, making them exceptionally excellent designs.

1 is a plan view (front surface) showing one embodiment of an automobile interior covering material according to the present invention. FIG. 2 is a bottom view (reverse side) of the automobile interior covering material shown in FIG. 1 . 2 is a cross-sectional view taken along the line A-A' of the automobile interior skin material shown in FIG. 1. FIG. 2 is a cross-sectional view showing another embodiment of an automobile interior covering material according to the present invention. 1 is a photograph of the surface of an automobile interior covering material of Example 1 . 1 is a photograph of the rear surface of the automobile interior covering material of Example 1 . 1 is a cross-sectional photograph of an automobile interior skin material of Example 1 .

Next, one embodiment of the automotive interior skin material according to the present invention will be described with reference to the drawings.

The skin material 1 for automobile interiors according to the present invention comprises a skin layer 2 and a layer laminated on the back side of the skin layer 2, the skin layer 2 contains one or two resins selected from the group consisting of polyvinyl chloride resins and polyurethane resins, the skin material 1 has a plurality of holes 4 penetrating the skin material 1, the side surfaces 5 of the holes 4 are visible from the skin layer 2 side, and the side surfaces 5 of the holes 4 include different colors (Figs. 1 to 4).

By adopting such a configuration, contrast and accent (emphasis) due to the different colors of the side surfaces 5 of the holes 4, which cannot be expressed by the multiple holes 4 and the arrangement or alignment of the holes 4 alone, are added, resulting in an excellent design, and an automobile interior skin material 1 with excellent design not available in conventional technology can be provided. Since the skin material 1 is sewn or molded to match the shape of the interior material and has a three-dimensional shape, it is possible to provide an automobile interior skin material with excellent design that gives a sense of beauty, especially in combination with the respective effects of flat and curved surfaces depending on the viewing direction from the driver and other users.

The surface layer 2 contains one or two resins selected from the group consisting of polyvinyl chloride resins and polyurethane resins. The surface layer 2 is formed by applying a resin composition containing a suitable amount of plasticizer, heat stabilizer, flame retardant, solvent, pigment, etc., depending on the resin, onto a release paper using a comma coater and then heat treating the resin. The polyurethane resin may be either a solvent-based polyurethane or a water-based polyurethane, and the polyvinyl chloride resin may have a molecular weight within a range that is fluid at room temperature and can be applied in the form of a film. For either resin, the plasticizer, heat stabilizer, and flame retardant may be appropriately selected and used.

The skin layer 2 is preferably in the form of a sheet or film, and the thickness t1 is not particularly limited, but is preferably in the range of 50 μm to 300 μm, and is preferably in a range where the thickness t1 of the skin layer 2 is 1/5 to 2/5 of the thickness t2 of the fiber fabric layer 3. This range of relationship is preferable because it allows the side surface 5 of the hole 4 to be sufficiently visible. In addition, within the range where the relationship between the thickness t1 and the thickness t2 is satisfied, the thickness t2 is preferably in the range of 200 μm to 1,500 μm.

The layer laminated on the back side of the skin layer is preferably a fiber fabric layer 3, and examples of the fiber fabric layer 3 include woven fabric, knitted fabric, nonwoven fabric, etc., but tricot knit fabric is preferred because holes 4 are created. The fiber materials constituting the woven fabric, knitted fabric, nonwoven fabric, etc. are not particularly limited and include natural fibers, synthetic fibers, etc. In addition, color can be imparted to the fiber fabric layer 3 by known methods such as dyed yarn, yarn dyeing with dye (e.g., skein dyeing, cheese dyeing, etc.) or roll dyeing (e.g., liquid flow dyeing, winch dyeing, etc.).

To laminate the fiber fabric layer 3 to the skin layer 2, for example, the above-mentioned resin composition is applied to a release paper using a comma coater, and then the fiber fabric layer 3 is laminated and then heat-treated to form an integrated laminate. It is preferable to nip the layers with a pair of rollers before the heat treatment.

The holes 4 pass through the fiber fabric layer 3 from the skin layer 2. The holes 4 are formed by perforating the skin material 1 with a punching mechanism. That is, the holes 4 are formed by punching with a punching die having a sharp cutting edge, for example, a substantially cylindrical needle. The diameter of the needle is not particularly limited, but is preferably in the range of 0.9 mm to 1.6 mm in consideration of the visibility of the side surface 5 of the punched hole 4 (FIGS. 1 to 4). FIG. 5 is a photograph of the front surface of the skin material for automobile interiors of Example 1 , and it is visible that the side surface 5 of the hole 4 contains a different color. FIG. 6 is a photograph of the back surface of the skin material for automobile interiors of Example 1 .

The diameter d1 of the hole 4 on the skin layer 2 side is preferably set in the range of 0.8 mm to 1.5 mm, and more preferably in the range of 1.0 mm to 1.3 mm. A range in which the diameter d1 of the hole 4 on the skin layer 2 side is 1.00 to 1.3 times the diameter d2 of the hole 4 on the fiber fabric layer 3 side is preferable. This range of relationship is preferable because it allows the side surface 5 of the hole 4 to be sufficiently visible. In addition, within the range in which the relationship between the diameter d1 and the diameter d2 is satisfied, the diameter d2 is preferably in the range of 0.6 mm to 1.3 mm (Figs. 1 to 4).

In the skin material 1 for automobile interiors of the present invention, the side surface 5 of the hole 4 can be seen from the skin layer 2 side. The color of the side surface 5 of the hole 4 includes different colors, and in the present invention, the different colors include layers of different colors among the layers constituting the skin material 1, and ΔE* calculated from the color measurement results at a viewing angle of 10 degrees using a D65 light source in the CIE (International Commission on Illumination) L*a*b* color system is 30 or more. On the other hand, if ΔE* is less than 30, it is difficult to recognize the different color at a glance. In this application, Δ is used to mean delta, and ΔE* means delta E* and means color difference. In order to include different colors in the color of the side surface 5 of the hole 4, the resin contained in the skin layer 2 may be blended with a pigment by kneading it into it, and the fibers constituting the fiber fabric layer 3 may be dyed by a known method using dyes according to the type of fiber or using dyes that are dyed using original fibers. In this case, the cross-sectional color of the skin layer 2 and the cross-sectional color of the fiber fabric layer 3 are measured under the above-mentioned conditions using a D65 light source so that the ΔE* is 30 or more. In this way, the cross-sectional color of the skin layer 2 and the cross-sectional color of the fiber fabric layer 3 become the color of the side surface 5 of the hole 4, so that the former color and the latter color are in a different color relationship, resulting in an automobile interior skin material 1 in which the side surface 5 of the hole 4 includes different colors.

It is also preferable that the cross-sectional color of the skin layer 2 and the cross-sectional color of the fiber fabric layer 3 are different colors. This allows for a clear change in the appearance of the different colors, resulting in an exceptionally excellent design.

In addition, the layers laminated on the back side of the skin layer are preferably a resin layer 6 and a fiber fabric layer 3, in that order. That is, a resin layer 6 is provided between the skin layer 2 and the fiber fabric layer 3, and the resin layer 6 contains one or two resins selected from the group consisting of polyvinyl chloride resins and polyurethane resins. By adopting such a configuration, the side surface 5 of the hole 4 can be sufficiently visually recognized, and the side surface 5 of the hole 4 has an increased variety of different colors, resulting in a more excellent design (FIGS. 4 and 5). FIG. 7 is a cross-sectional photograph of Example 1 in which a resin layer 6 is provided between the skin layer 2 and the fiber fabric layer 3, the skin layer 2 is black, and the resin layer 6 and the fiber fabric layer 3 are orange. The skin layer 2 and the fiber fabric layer 3 are different colors, and the resin layer 6 and the fiber fabric layer 3 are the same color.

In addition, it is preferable that the thickness t1 of the skin layer 2 is in a range that satisfies the relationship of 1/10 to 1/5 of the sum of the thickness t3 of the resin layer 6 and the thickness t2 of the fiber fabric layer 3 (FIG. 4). By setting the thickness t1 in this range, the skin material 1 having the specific type of resin layer 6 between the skin layer 2 and the fiber fabric layer 3 and having the thickness relationship between the skin layer 2, the resin layer 6, and the fiber fabric layer 3 in the specific range allows the side surface 5 of the hole 4 to be fully visible, and the side surface 5 of the hole 4 can be made in a greater variety of different colors, resulting in an even more excellent design.

The resin layer 6 is formed by applying a resin composition containing a foaming agent, a plasticizer, a heat stabilizer, a flame retardant, a solvent, a pigment, etc., appropriately depending on the resin, onto the skin layer 2 using a comma coater, and then heat-treating the resin composition. The resin layer 6 may be two or more layers, and may have different compositions. When the skin layer 2 contains a polyvinyl chloride resin, the resin layer 6 is preferably foamed, and the resin layer 6 and the fiber fabric layer 3 are preferably laminated via an adhesive layer. The adhesive layer is made of a resin containing a plasticizer, a heat stabilizer, a flame retardant, a pigment, etc. The plasticizer, heat stabilizer, and flame retardant may be appropriately selected and used.

The thickness of the resin layer 6 is preferably in the range of 200 μm to 700 μm, within the range in which the thickness t1 of the skin layer 2 satisfies the relationship between the thickness t3 of the resin layer 6 and the thickness t2 of the fiber fabric layer 3. It is also preferable to laminate the fiber fabric layer 3 to the resin layer 6 via an adhesive layer. When the skin layer 2 contains a polyvinyl chloride resin, for example, a polyvinyl chloride resin can be used as the adhesive layer. On the other hand, when the skin layer 2 contains a polyurethane resin, for example, a polyurethane resin can be used as the adhesive layer.

It is preferable that the cross-sectional color of the skin layer 2 and the cross-sectional color of the resin layer 6 are similar colors. In this case, the cross-sectional color of the fiber fabric layer 3 is different from the cross-sectional color of the skin layer 2. It is also preferable that the cross-sectional color of the skin layer 2 and the cross-sectional color of the resin layer 6 are different colors. In this case, the cross-sectional color of the fiber fabric layer 3 is different from or similar to the cross-sectional color of the skin layer 2. It is also preferable that the cross-sectional color of the resin layer and the cross-sectional color of the fiber fabric layer are similar colors. In this case, the cross-sectional color of the fiber fabric layer 3 is different from the cross-sectional color of the skin layer 2. It is also preferable that the cross-sectional color of the resin layer and the cross-sectional color of the fiber fabric layer are different colors. In this case, the cross-sectional color of the fiber fabric layer 3 is different from or similar to the cross-sectional color of the skin layer 2. In this way, the appearance of different colors gives more variation, making it possible to achieve an exceptionally excellent design.

In the present invention, the similar colors have a ΔE* value of 20 or less, calculated from color measurement results at a viewing angle of 10 degrees using a D65 light source in the CIE (International Commission on Illumination) L*a*b* color system. Conversely, if the ΔE* value is 20 or more, it becomes difficult to recognize the colors as similar at a glance.

It is preferable to provide a surface treatment layer on the surface side of the skin layer 2 of the present invention. The surface treatment layer can be any polyurethane resin, not limited to solvent-based or water-based, but polycarbonate-based polyurethane is preferable because it has excellent hydrolysis resistance and light resistance, and either solvent-based or water-based polyurethane can be used. The thickness of the surface treatment layer is preferably in the range of 5 μm to 40 μm, and can be formed, for example, by coating using a gravure roll.

Next, specific examples of the present invention will be described, but the present invention is not limited to these two-layer and three-layer skin materials.

<Composition, materials used, etc.>
Surface layer A: 100 parts by weight of solvent-based polyurethane
Dimethylformamide 30 parts by weight
Methyl ethyl ketone 30 parts by weight
Pigment (choose appropriately)
Skin layer B: 100 parts by weight of polyvinyl chloride
Plasticizer 85 parts by weight
Heat stabilizer 4 parts by weight
Flame retardant (antimony trioxide) 3 parts by weight
Pigment (choose appropriately)

Fabric layer: Tricot knitted with 167T/48f polyester fiber yarn (density: 38 courses/inch, 46 wales/inch, thickness: 0.6 mm)

Resin layer: 85 parts by weight of polyvinyl chloride
Plasticizer 50 parts by weight
Heat stabilizer 2 parts by weight
Foaming agent 2 parts by weight
Flame retardant (antimony trioxide) 10 parts by weight
Pigment (choose appropriately)

Adhesive layer A: 100 parts by weight of polyvinyl chloride
Plasticizer 65 parts by weight
Heat stabilizer 2 parts by weight
Flame retardant (antimony trioxide) 5 parts by weight
Pigment (choose appropriately)
Adhesive layer B: 100 parts by weight of solvent-based polyurethane
Crosslinking agent 8 parts by weight
Dimethylformamide 20 parts by weight
Methyl ethyl ketone 20 parts by weight
Flame retardant (phosphorus-based) 25 parts by weight
Pigment (choose appropriately)

Surface treatment layer: Polycarbonate-based polyurethane (solvent-based) 70 parts by weight
Polycarbonate-based polyurethane (solvent-based) 30 parts by weight
Solvent (choose appropriately)

<Reference Example 1>
A resin liquid obtained by adding a pigment to the above-mentioned formulation of the skin layer A and making it black was applied to a release paper using a comma coater so that the coating thickness was 200 μm, and then dried at 180° C. for 1 minute to form a skin layer. A fiber fabric layer dyed red was overlaid on the obtained skin layer, and then the fiber fabric layer was laminated by nipping and pressing with a nip roll. Next, a punching die equipped with a cylindrical needle having an outer diameter of 1.3 mm was used to punch from the skin layer side to form a hole penetrating the fiber fabric layer from the skin layer, and a skin material for automobile interior was obtained. The diameter of the hole on the skin layer side and the diameter on the fiber fabric layer side were 1.0 mm and 0.8 mm, respectively. The color measurement result ΔE* was 51.36, and the skin material was evaluated as "◎" and passed.

<Reference Example 2>
In Reference Example 1 , the colors of the surface layer and the fiber fabric layer were changed. That is, a surface material for automobile interiors was obtained in the same manner as in Reference Example 1 , except that a pigment was used in the formulation of the surface layer A to make it light gray, and a fiber fabric layer dyed orange was used as the fiber fabric layer. The color measurement result ΔE* was 49.02, and the surface material was evaluated as "◯" and passed.

<Reference Example 3>
In Reference Example 1 , the color of the fiber fabric layer was changed. That is, a skin material was obtained in the same manner as in Reference Example 1 , except that a fiber fabric layer dyed in ocean gray was used as the fiber fabric layer. The color measurement result ΔE* was 35.79, and the skin material was evaluated as "◯" and passed.

Example 1
The resin liquid obtained by adding a pigment to the above-mentioned formulation of the skin layer B and making it black was applied to the release paper with a comma coater so that the coating thickness was 200 μm, and then dried at 180 ° C for 1 minute to form a skin layer. Next, the resin liquid obtained by adding a pigment to the above-mentioned formulation of the resin layer and making it orange was applied to the skin layer with a comma coater so that the coating thickness was 400 μm, and then dried at 165 ° C for 1 minute to form a resin layer. Furthermore, the liquid obtained by the above-mentioned formulation of the adhesive layer A was applied to the obtained resin layer with a comma coater, and a fiber fabric layer dyed orange was superimposed, and then the fiber fabric layer was laminated by nipping with a nip roll, and dried at 180 ° C for 1 minute. In this way, a foamed resin layer was provided between the skin layer and the fiber fabric layer. Next, a punching die equipped with a cylindrical needle having an outer diameter of 1.3 mm was used to punch from the skin layer side to form a hole penetrating the fiber fabric layer from the skin layer, and a skin material for automobile interior was obtained. The diameter of the hole on the skin layer side was 1.0 mm and the diameter on the fiber fabric layer side was 0.8 mm. The color measurement result ΔE* was 74.75, and the skin material was evaluated as passing with a grade of "◎".

Example 2
In Example 1 , the colors of the resin layer and the fiber fabric layer were changed. That is, a resin liquid in which a pigment was added to the resin layer to make it yellow was used on the skin layer, and a fiber fabric layer dyed yellow was used, and other than that, a skin material for automobile interiors was obtained in the same manner as in Example 1. The color measurement result ΔE* was 60.02, and the skin material was evaluated as "◎" and passed.

Example 3
In Example 2 , the colors of the skin layer and the resin layer were changed. That is, a skin material for automobile interiors was obtained in the same manner as in Example 2 , except that a resin liquid was used in which the skin layer B was formulated to have a yellow color by adding a pigment, and the resin layer on top of the skin layer was formulated to have a blue color by adding a pigment. The color measurement result ΔE* was 66.5, and the skin material was evaluated as "◎" and passed.

Example 4
In Example 3 , the color of the skin layer was changed. That is, a skin material for automobile interiors was obtained in the same manner as in Example 3 , except that a pigment was used in the formulation of skin layer B to make it red. The result of color measurement, ΔE*, was 42.22, and the skin material was evaluated as "good" and passed.

Example 5
In Example 1 , the colors of the skin layer, resin layer, and fiber fabric layer were changed. That is, a skin material for automobile interiors was obtained in the same manner as in Example 1, except that a pigment was added to the formulation of the skin layer B to make it blue, a pigment was added to the formulation of the resin layer on top of the skin layer to make it red, and a fiber fabric layer dyed red was used. The color measurement result ΔE* was 63.02, and the skin material was evaluated as "◎" and passed.

<Comparative Example 1>
In Reference Example 1 , the color of the fiber fabric layer was changed. That is, a fiber fabric layer dyed black was used as the fiber fabric layer, and other than that, a skin material for automobile interiors was obtained in the same manner as in Reference Example 1. The color measurement result ΔE* was 2.86, and the skin material was evaluated as "x" and failed.

<Comparative Example 2>
In Example 3 , the color of the resin layer was changed. That is, a skin material was obtained in the same manner as in Example 3 , except that a resin liquid in which a pigment was added to the resin layer formulation to make it yellow was used on the skin layer. The color measurement result ΔE* was 17.63, and the skin material was evaluated as "x" and failed.

As is clear from Table 1, the vehicle interior materials of Examples 1 to 5 exhibited excellent design properties, with the easily visible different colors being included in the colors of the side surfaces of the holes, whereas in Comparative Examples 1 and 2, it was difficult to say that a distinct different color was visible on the side surfaces of the holes.

<Evaluation method for skin material>
The skin material was evaluated comprehensively by colorimetry and visual inspection. The surface layer and the fiber fabric layer were measured using NF555 manufactured by Nippon Denshoku Industries Co., Ltd. (D65 light source) to obtain the L*, a*, and b* values. The side of the hole in the resin layer was measured using VSS7700 manufactured by Nippon Denshoku Industries Co., Ltd. (D65 light source) which can measure the color of a circle with a diameter of 30 μm to obtain the L*, a*, and b* values. The color difference ΔE* was calculated from the respective L*, a*, and b* values. Next, the covering material was placed on a desk, and the surface of the covering material, as well as the holes and the sides of the holes, were visually observed from five directions, namely directly above the covering material, diagonally upward from the front, diagonally upward from the rear, diagonally upward from the right, and diagonally upward from the left, in comparison with Comparative Example 1. A color difference ΔE* of 50 or more indicated a clearly discernible different color, a color difference ΔE* of 30 or more and less than 50 indicated a discernible different color, and a color difference ΔE* of less than 30 indicated only a faint color or no discernible color at all. Therefore, the covering material was evaluated according to the following judging criteria. A judgement of "◯" or more was deemed to be a pass.
(Judgment criteria)
"◎": Color difference ΔE* is 50 or more.
"Good": Color difference ΔE* is 30 or more and less than 50.
"X": Color difference ΔE* is less than 30.

The automotive interior skin material of the present invention can be used effectively for seat covers, doors, ceilings, instrument panels, etc.

1. Skin material (skin material for automobile interiors)
2: Skin layer 3: Fiber fabric layer 4: Hole 5: Side of hole 6: Resin layer d1: Diameter of hole on skin layer side d2: Diameter of hole on fiber fabric layer side t1: Thickness of skin layer t2: Thickness of fiber fabric layer t3: Thickness of resin layer

Claims (3)

The skin material includes a skin layer and a layer laminated on a back surface side of the skin layer,
the surface layer contains one or two resins selected from the group consisting of polyvinyl chloride resins and polyurethane resins,
the layers laminated on the back side of the skin layer are a resin layer and a fiber fabric layer, in that order, and the resin layer laminated on the back side of the skin layer is a layer containing one or two types of resin selected from the group consisting of polyvinyl chloride resins and polyurethane resins;
The fiber fabric layer is a tricot knit fabric,
a thickness t1 of the skin layer is 1/10 to 1/5 of a sum of a thickness t3 of the resin layer laminated on the back side of the skin layer and a thickness t2 of the fiber fabric layer laminated on the back side of the skin layer; and
The thickness t3 of the resin layer is 200 μm to 700 μm,
The thickness t2 of the fiber fabric layer is in the range of 200 μm to 1,500 μm,
the skin material has a plurality of punched cone-shaped holes penetrating from a skin layer on a front side of the skin material to a fiber fabric layer on a back side of the skin material,
The diameter d1 of the hole on the skin layer side is in the range of 0.8 mm to 1.5 mm ,
The side surface of the hole is visible from the skin layer side,
At least one of the surface layer, the resin layer, and the fiber fabric layer has a side surface of the hole that is a different color from any of the other layers;
The different color has a color difference from the surface layer of ΔE*=30 or more. The skin material for automotive interiors according to claim 1, wherein the cross-sectional color of the resin layer is different from the cross-sectional color of the skin layer, and the cross-sectional color of the fiber fabric layer is similar to the cross-sectional color of the resin layer. The skin material for automotive interiors according to claim 1, wherein the cross-sectional color of the skin layer, the cross-sectional color of the resin layer, and the cross-sectional color of the fiber fabric layer are different from each other.

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