Slush-molded skin material, vehicle interior component, and method for manufacturing skin material

Abstract

To express new designs on a surface of a skin material.SOLUTION: A skin material (30) contains a first resin (R1) as a main component and a second resin (R2) having a lower melting temperature than the first resin (R1), and is molded by powder slush molding. A first resin part (30A) made of the first resin (R1) and a second resin part (30B) made of the second resin (R2) are exposed on the surface of the skin material (30). Fine irregularities (38) forming a grain pattern are formed on the first resin part (30A). The second resin part (30B) is formed smoother than the first resin part (30A).SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a slush molded skin material, a vehicle interior part, and a method for manufacturing the skin material. [Background technology]

[0002] Skin materials that form the surfaces of vehicle interior parts such as instrument panels are known to have fine irregularities such as grain patterns on their surfaces. An example of a skin material with a grain pattern is disclosed in Patent Document 1. Such skin materials are generally molded by powder slush molding. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-78320 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, the shapes and decorations of vehicle interior parts have become more diverse, and new design expressions that cannot be expressed simply by adding a grain pattern are required for the surface materials.

[0005] An object of the present disclosure is to express a new design on the surface of a skin material. [Means for solving the problem]

[0006] In order to achieve the above object, the technique of the present disclosure forms minute irregularities on the surface of a skin material, and also scatters glossy portions on the surface.

[0007] Specifically, a first aspect of the present disclosure is directed to a slush-molded skin material. The slush-molded skin material of the first aspect contains a first resin as a main component and a second resin having a melting temperature lower than that of the first resin. The slush-molded skin material has a surface on which a first resin portion made of the first resin and a second resin portion made of the second resin are exposed. Fine irregularities are formed on the surface of the slush-molded skin material. The irregularities are formed on the first resin portion. The second resin portion is formed smoother than the first resin portion.

[0008] A second aspect of the present disclosure is the slush-molded skin material of the first aspect, wherein the second resin portions are scattered on the surface of the skin material with faces facing in different directions.

[0009] A third aspect of the present disclosure is the slush-molded skin material of the first or second aspect, wherein the temperature difference between the melting temperature of the first resin and the melting temperature of the second resin is 30°C or more.

[0010] A fourth aspect of the present disclosure is the slush-molded skin material of any one of the first to third aspects, wherein the first resin is a polyvinyl chloride resin, and the second resin is an acrylic resin.

[0011] A fifth aspect of the present disclosure is directed to a vehicle interior part including a skin material. In the vehicle interior part of the sixth aspect, the skin material is the slush-molded skin material of any one of the first to fourth aspects.

[0012] A sixth aspect of the present disclosure is directed to a method for producing a resin skin material using powder slush molding. a melting step of supplying a powdered resin raw material, the powdered resin raw material being a mixture of a powder of a first resin as a main component and a powder of a second resin having a lower melting temperature than the first resin, to the molding surface of the slush molding mold heated in the mold heating step, and adhering and melting the powdered resin raw material to form a molten resin layer; a cooling step of cooling and solidifying the molten resin layer formed in the melting step, thereby forming the skin material with a first resin portion made of the first resin and a second resin portion made of the second resin exposed on the surface and with the irregularities transferred to the surface; a demolding step of removing the skin material obtained in the cooling step from the slush molding mold; and a smoothing step of heating the surface of the skin material removed from the slush molding mold in the demolding step to a temperature higher than the melting temperature of the second resin and lower than the melting temperature of the first resin, thereby softening and smoothing the second resin portion. [Effects of the Invention]

[0013] According to the first aspect, the first resin portion and the second resin portion are exposed on the surface of the skin material. Fine irregularities are formed in the first resin portion. These irregularities allow patterns such as grain patterns to be expressed on the surface of the skin material. Furthermore, light incident on the first resin portion is scattered and reflected by the irregularities. As a result, the first resin portion presents a matte surface with reduced gloss. On the other hand, the second resin portion is formed smoother than the first resin portion. As a result, the second resin portion has stronger specular reflection characteristics than the first resin portion, resulting in gloss. Therefore, the second resin portion presents a surface with higher gloss than the first resin portion. In this way, the difference in gloss between the first resin portion and the second resin portion allows new designs to be expressed on the surface of the skin material.

[0014] According to the second aspect, the second resin portions are scattered on the surface of the skin material, with faces facing in different directions. Light hitting the surface of the skin material is reflected in different directions by the scattered second resin portions. This causes differences in brightness in the second resin portions depending on the direction from which the skin material is viewed. As a result, when the direction of light hitting the surface of the skin material or the direction from which the skin material is viewed changes, the surface of the skin material appears to sparkle.

[0015] According to the third aspect, the temperature difference between the melting temperature of the first resin and the melting temperature of the second resin is 30° C. or more. In manufacturing a skin material, when the second resin portion is smoothed by heating the surface of the skin material after molding, if the temperature difference between the melting temperature of the first resin and the melting temperature of the second resin is 30° C. or more, the second resin portion is softened and smoothed without softening the first resin portion, and it is relatively easy to leave fine irregularities in the first resin portion.

[0016] According to a fourth aspect, the first resin is a polyvinyl chloride resin and the second resin is an acrylic resin. Polyvinyl chloride resins are suitable for the first resin portion because they have excellent durability, weather resistance, water resistance, high electrical insulation, and resistance to ultraviolet light. Acrylic resins have a higher melting temperature than polyvinyl chloride resins and are both weather resistant and transparent, making them suitable for the second resin portion, which presents a surface with a higher gloss than the first resin portion.

[0017] According to a fifth aspect, a vehicle interior trim includes the slush-molded skin material of any one of the first to fourth aspects. The slush-molded skin material allows the vehicle interior trim to express new designs due to the difference in gloss between the first resin portion and the second resin portion. This increases the degree of freedom in the design expression of the vehicle interior trim.

[0018] According to a sixth aspect, a powder resin raw material used in powder slush molding is a mixture of a first powder made of a first resin as a main component and a second powder made of a second resin having a melting temperature lower than that of the first resin. This powder resin raw material is then molded into a skin material having a first resin portion made of the first resin and a second resin portion made of the second resin exposed on the surface. The fine irregularities on the molding surface of the slush molding die are transferred to the first resin portion and the second resin portion, respectively. Therefore, when the skin material is removed from the slush molding die, both the first resin portion and the second resin portion have fine irregularities. However, the surface of the skin material is then heated to a temperature higher than the melting temperature of the second resin but lower than the melting temperature of the first resin, thereby softening and smoothing the second resin portion. This allows the second resin portion to have a glossier surface than the first resin portion while retaining the fine irregularities in the first resin portion. This skin material manufacturing method is thus suitable for producing skin materials that can express new designs. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a front view illustrating the approximate left half of an instrument panel to which a decorative panel is attached. [Figure 2] FIG. 2 is a plan view of the decorative panel as seen from the back side. [Figure 3] 3 is a cross-sectional view of the decorative panel and its surroundings taken along line III-III in FIG. [Figure 4A] FIG. 4A is a plan view illustrating an example of how the surface of a decorative panel looks when light strikes it from a first direction. [Figure 4B] FIG. 4B is a plan view illustrating an example of how the surface of the decorative panel looks when light strikes it from a second direction. [Figure 5] FIG. 5 is a cross-sectional view illustrating a slush molding die used to mold the skin material. [Figure 6] FIG. 6 is a cross-sectional view illustrating the state of a mold heating step in the production of a skin material. [Figure 7]FIG. 7 is a cross-sectional view illustrating a state in which the slush molding die is combined with a box. [Figure 8] FIG. 8 is a cross-sectional view illustrating the melting step in the production of the skin material. [Figure 9] FIG. 9 is a cross-sectional view illustrating the cooling step in the production of a skin material. [Figure 10] FIG. 10 is a cross-sectional view illustrating the demolding step in the production of a skin material. [Figure 11] FIG. 11 is a cross-sectional view illustrating the smoothing step in the production of a skin material. [Figure 12] FIG. 12 is a cross-sectional view illustrating the change in the surface condition of the skin material due to the smoothing process. [Figure 13] FIG. 13 is a cross-sectional view illustrating the demolding step and post-treatment in the production of a skin material. DETAILED DESCRIPTION OF THE INVENTION

[0020] Exemplary embodiments will be described in detail below with reference to the drawings. In the following embodiments, a vehicle interior part according to the present disclosure will be described by taking as an example a case where the vehicle interior part is applied to an instrument panel. Note that the drawings are intended to conceptually explain the technology of the present disclosure. Therefore, in the drawings, dimensions, ratios, or numbers may be exaggerated or simplified to facilitate understanding of the technology of the present disclosure.

[0021] <<Embodiment>> The instrument panel 1 shown in Fig. 1 is a panel including an instrument panel on which various devices such as an engine tachometer and a speedometer are mounted, and is disposed in the front part of the vehicle compartment. The instrument panel 1 is supported by an instrument panel reinforcement (not shown) extending in the vehicle width direction and attached to the vehicle body. The instrument panel 1 constitutes a dashboard that separates the engine compartment from the vehicle compartment.

[0022] One side of the instrument panel 1 in the left-right direction (the right side not shown in FIG. 1) corresponds to the driver's seat, and the other side (the left side shown in FIG. 1) corresponds to the passenger seat. A glove compartment 3 is attached to the instrument panel 1 below the portion corresponding to the passenger seat in an openable and closable manner. A panel mounting portion 5 is provided above the glove compartment 3 on the instrument panel 1.

[0023] The panel mounting portion 5 is formed in a horizontally long recess extending in the vehicle width direction. A decoration panel 7 is fitted into the panel mounting portion 5. The decoration panel 7 covers the opening of the panel mounting portion 5 and is fixed to the instrument panel body. The decoration panel 7 is an example of a vehicle interior accessory. The decoration panel 7 adds a design accent to the interior of the automobile.

[0024] -Decoration panel configuration- As shown in FIGS. 2 and 3, the decorative panel 7 includes a base material 10 and a skin material 30.

[0025] The base material 10 is a resin plate-like object that serves as the base of the decorative panel 7. The base material 10 is formed, for example, by injection molding. Examples of materials for the base material 10 include polypropylene (PP) and acrylonitrile butadiene styrene (ABS). The base material 10 includes a main plate portion 12 and a side wall portion 14. The main plate portion 12 is formed in the shape of a horizontally long strip. The main plate portion 12 has a surface that faces the interior of the vehicle cabin.

[0026] A plurality of mounting projections 16 (two mounting projections 16 in the example shown in FIG. 2) are integrally formed on the back surface of the main plate portion 12. The mounting projections 16 are located approximately in the middle of the base material 10 in the vertical direction. Each of the plurality of mounting projections 16 has a base portion 18 and an engaging claw 20. The base portion 18 is formed in a box shape that is open in one direction. The engaging claw 20 is formed on the back side of the base portion 18.

[0027] The engaging claws 20 are formed with tongues 22. The tongues 22 have claw portions 24 on one side. The tongues 22 are surrounded by U-shaped slits 26 and are relatively flexible. Engagement holes 6 are formed in the bottom surface of the panel mounting part 5 at locations corresponding to the engaging claws 20. The decorative panel 7 is attached to the panel mounting part 5 by inserting each engaging claw 20 into the corresponding engaging claw 20 while bending the tongues 22, and engaging the engaging claws with the periphery of the engagement holes 6.

[0028] The side wall portion 14 is provided around the entire outer periphery of the main plate portion 12. The side wall portion 14 extends from the outer periphery of the main plate portion 12 to the back side. The side wall portion 14 constitutes the peripheral portion of the base material 10. A plurality of protrusions 28 are formed on the end surface located on the back side of the side wall portion 14. The plurality of protrusions 28 are provided at intervals from one another in the circumferential direction of the side wall portion 14. Each protrusion 28 is used to fasten the covering material 30 to the base material 10.

[0029] -Skin material composition- The skin material 30 is a slush-molded skin material, and is formed, for example, by powder slush molding. The skin material 30 is both flexible and extensible. The skin material 30 has a main surface portion 32 and a fastening piece 34. The main surface portion 32 of the skin material 30 covers the surface of the base material 10. Specifically, the main surface portion 32 covers the surface of the main plate portion 12 and the outer peripheral surface of the side wall portion 14 of the base material 10 when tension is applied.

[0030] A plurality of fastening pieces 34 are provided at intervals from one another on the outer periphery of the main surface portion 32. A fastening hole 36 is formed in each of the plurality of fastening pieces 34. Each fastening piece 34 is folded back to the back side of the base material 10 and abuts against the end face of the side wall portion 14. The protrusions 28 on the side wall portion 14 are inserted into the fastening holes 36 of each fastening piece 34. As a result, the covering material 30 is hooked onto the peripheral edge portion of the base material 10 and is tightly attached to the surface of the base material 10 due to the tension applied to the covering material 30.

[0031] Fine irregularities 38 are formed on the surface of the skin material 30. These irregularities 38 form a grain pattern as shown in FIGS. 4A and 4B. The skin material 30 is made of a resin composition containing a first resin R1 as a main component and a second resin R2 as an additive. The first resin R1 is a polyvinyl chloride resin. The second resin R2 is an acrylic resin. The acrylic resin functions as a tactile feel improver that improves the tactile feel of the skin material 30.

[0032] The melting temperature of the second resin R2 is lower than that of the first resin R1. The temperature difference between the melting temperatures of the first resin R1 and the second resin R2 is preferably 30°C or more and 200°C or less. In the skin material 30 of this example, the melting temperature of the acrylic resin is approximately 80°C to 120°C, and the melting temperature of the polyvinyl chloride resin is approximately 170°C.

[0033] A first resin portion 30A made of a first resin R1 and a second resin portion 30B made of a second resin R2 are exposed on the surface of the skin material 30. The first resin portion 30A occupies most of the surface of the skin material 30. Asperities 38 forming a grain pattern are formed on the first resin portion 30A. Light incident on the first resin portion 30A is scattered and reflected by the asperities 38. This gives the first resin portion 30A a matte surface with reduced gloss.

[0034] The second resin portion 30B has surfaces facing in different directions and is scattered like particles on the surface of the skin material 30. The second resin portion 30B is formed smoother than the first resin portion 30A. This gives the second resin portion 30B a stronger specular reflection characteristic than the first resin portion 30A, resulting in a glossy surface. Therefore, the second resin portion 30B has a glossier surface than the first resin portion 30A. Thus, there is a difference in gloss between the first resin portion 30A and the second resin portion 30B.

[0035] Light that strikes the surface of the skin material 30 is reflected in different directions by the scattered second resin portions 30B. This causes differences in brightness in the second resin portions 30B depending on the direction from which the skin material 30 is viewed. For example, as shown in FIG. 4A, when light strikes the surface of the decorative panel 7 from the rear left side, a difference in brightness occurs in the second resin portions 30B compared to when light strikes the surface of the decorative panel 7 from the rear right side, as shown in FIG. 4B (second resin portions 30B with higher brightness are indicated by white circles in FIGS. 4A and 4B).

[0036] When the direction of light shining on the surface of the decorative panel 7 or the direction from which the decorative panel is viewed changes, the difference in brightness of the second resin portion 30B causes the surface of the skin material 30 to appear sparkling. The content of the second resin R2 is adjusted according to the degree of sparkle desired for the surface of the skin material 30. For example, the content of the second resin R2 is preferably 4 to 23 parts by weight, more preferably 5 to 22 parts by weight, and even more preferably 7 to 20 parts by weight, relative to 100 parts by weight of the resin composition that constitutes the skin material 30.

[0037] -Method of manufacturing skin material- The skin material 30 is manufactured using a powder slush molding method. A shell-shaped slush molding die 100 shown in Figure 5 is used to mold the skin material 30. The slush molding die 100 is configured so that it can be attached to and separated from a raw material storage box 110.

[0038] The slush molding die 100 has a concave die body 102 and a flange portion 104. The inner surface of the die body 102 forms a molding surface 106 that molds the surface of the skin material 30. Fine irregularities 108 are formed on this molding surface 106. The irregularities 108 are used to form a grain pattern on the skin material 30. The flange portion 104 is provided around the entire periphery of the die body 102.

[0039] The method for manufacturing the skin material 30 includes a mold heating step, a melting step, a cooling step, a demolding step, and a smoothing step.

[0040] First, a mold heating step is performed. In this mold heating step, the slush forging mold 100 is heated. Specifically, as shown in Fig. 6, the slush forging mold 100 is carried into a heating furnace 200 with the molding surface 106 facing downward. The slush forging mold 100 is then heated to a predetermined heating temperature, for example, 180°C to 270°C, by upper and lower first heaters 202 provided in the heating furnace 200. The heated slush forging mold 100 is then carried out of the heating furnace 200.

[0041] Next, a melting step is carried out. In this step, powdered resin raw material RM is supplied to the molding surface 106 of the slush molding die 100 heated in the die heating step, and is allowed to adhere and melt, thereby forming a molten resin layer 40. The supply of powdered resin raw material RM to the molding surface 106 of the slush molding die 100 is carried out by rotating the assembly 120 of the slush molding die 100 and the raw material storage box 110.

[0042] 7, the heated slush molding die 100 is first placed with the molding surface 106 facing downward, and the flange 104 is placed over the periphery of the opening of the raw material storage box 110. Then, the flange 104 of the slush molding die 100 is clamped with a clamping jig (not shown) provided on the raw material storage box 110 side, and a sealant 115 is sandwiched between the mating surfaces of the flange 104 of the die 100 and the raw material storage box 110 to seal them.

[0043] In this way, the slush molding die 100 is joined by fixing the flange portion 104 to the raw material storage box 110. A powdered resin raw material RM is stored inside the raw material storage box 110. The powdered resin raw material RM is the raw material of the resin composition that forms the skin material 30, and is a mixture of powder of a first resin R1 (polyvinyl chloride resin) as the main component and powder of a second resin R2 (acrylic resin) as an additive.

[0044] Next, as shown in Fig. 8, the joined body 120 formed by joining the slush molding die 100 and the raw material storage box 110 is rotated 180° around a horizontal rotation axis 123 by a rotation device (not shown). In this way, the powdered resin raw material RM stored in the raw material storage box 110 is supplied to and adhered to the molding surface 106 of the slush molding die 100. The powdered resin raw material RM adhered to the molding surface 106 is heated and melted by the mold temperature, forming a molten resin layer 40 (shown by a dashed line in Fig. 8) that will become the skin material 30.

[0045] Furthermore, the joined body 120 of the slush molding die 100 and the raw material storage box 110 is rotated 180° by a rotation device to return it to its original position before the rotation. When the joined body 120 is returned to its original position, the powder resin raw material RM falls into the raw material storage box 110 and is collected. In this example, the joined body 120 is rotated 360° in one direction only once, but the joined body 120 may be rotated 360° two or more times, or the joined body 120 may be rotated alternately in different directions.

[0046] Next, a cooling step is performed. As shown in Fig. 9, in the cooling step, the molten resin layer 40 formed in the melting step is cooled and solidified to form the skin material 30. On the surface of the skin material 30 formed in this manner, a first resin portion 30A made of the first resin R1 and a second resin portion 30B made of the second resin R2 are exposed, and the irregularities 108 on the molding surface 106 of the slush molding die 100 are transferred to the surface. At this stage, fine irregularities 38 are formed on both the first resin portion 30A and the second resin portion 30B.

[0047] Next, the clamping of the flange portion 104 by the clamping jig is released, and the slush forging die 100 is removed and separated from the raw material storage box 110. The cooling step may be performed after the slush forging die 100 has been separated from the raw material storage box 110. Next, the demolding step is performed. As shown in Figure 10, in the demolding step, the skin material 30 obtained in the cooling step is peeled off and removed from the slush forging die 100.

[0048] Next, a smoothing step is performed. In the smoothing step, the surface removed from the slush molding die 100 in the demolding step is heated to soften and smooth the second resin portion 30B. Specifically, as shown in Fig. 11, the skin material 30 removed from the slush molding die 100 is attached to and held in a holding jig 125 with the surface facing outward. Then, the surface of the skin material 30 held in the holding jig 125 is heated by a second heater 300.

[0049] At this time, the heating temperature of the surface of the skin material 30 is higher than the melting temperature of the first resin R1 but lower than the melting temperature of the second resin R2, for example, about 120°C. When the surface of the skin material 30 is heated to such a temperature, the first resin portion 30A does not melt, but the second resin portion 30B does. By doing so, only the second resin portion 30B is softened and smoothed, as shown in FIG. 12. Meanwhile, the first resin portion 30A is left with unevenness 38 forming a grained pattern.

[0050] 13, the skin material 30, whose second resin portion 30B has been smoothed in the smoothing step, is removed from the holding jig 125. Then, the excess portion 31 of the skin material 30 is cut and removed.

[0051] In this manner, the skin material 30 can be manufactured.

[0052] -Features of the embodiment- In the skin material 30 of this embodiment, the first resin portion 30A and the second resin portion 30B are exposed on the surface of the skin material 30. Fine irregularities 38 are formed in the first resin portion 30A. These irregularities 38 allow a grain pattern to be expressed on the surface of the skin material 30. On the other hand, the second resin portion 30B is formed to be smoother than the first resin portion 30A. This creates a difference in gloss between the first resin portion 30A and the second resin portion 30B, allowing a new design to be expressed on the surface of the skin material 30.

[0053] In the skin material 30 of this embodiment, the second resin portions 30B are scattered on the surface of the skin material 30, with the surfaces facing in different directions. As a result, when the direction of light shining on the surface of the skin material 30 or the direction from which the skin material 30 is viewed changes, the surface of the skin material 30 appears to sparkle.

[0054] In the skin material 30 of this embodiment, the temperature difference between the melting temperature of the first resin R1 and the melting temperature of the second resin R2 is 30° C. or more. In manufacturing the skin material 30, when the second resin portion 30B is smoothed by heating the surface of the skin material 30 after molding, if the temperature difference between the melting temperature of the first resin R1 and the melting temperature of the second resin R2 is 30° C. or more, the second resin portion 30B can be softened and smoothed without softening the first resin portion 30A, and it is relatively easy to leave fine irregularities 38 in the first resin portion 30A.

[0055] In the skin material 30 of this embodiment, the first resin R1 is a polyvinyl chloride resin, and the second resin R2 is an acrylic resin. Polyvinyl chloride resin has excellent durability, weather resistance, and water resistance, as well as high electrical insulation and resistance to ultraviolet light, making it a suitable material for the first resin portion 30A. Acrylic resin has a higher melting temperature than polyvinyl chloride resin and is both weather resistant and transparent, making it a suitable material for the second resin portion 30B, which presents a glossier surface than the first resin portion 30A.

[0056] The decorative panel 7 of this embodiment includes the above-described skin material 30. The skin material 30 allows new designs to be expressed on the decorative panel 7 due to the difference in gloss between the first resin portion 30A and the second resin portion 30B. This increases the degree of freedom in the design expression of the decorative panel 7.

[0057] In the method for manufacturing the skin material 30 of this embodiment, a powdered resin raw material RM used in powder slush molding is prepared by mixing a powder of a first resin R1 as the main component with a powder of a second resin R2 having a melting temperature lower than that of the first resin R1. This powdered resin raw material RM is then molded into a skin material 30 having a first resin portion 30A made of the first resin R1 and a second resin portion 30B made of the second resin R2 exposed on the surface. The fine asperities 108 on the molding surface 106 of the slush molding die 100 are transferred to the first resin portion 30A and the second resin portion 30B. Therefore, when the skin material 30 is removed from the slush molding die 100, both the first resin portion 30A and the second resin portion 30B have the fine asperities 38. The surface of the skin material 30 is then heated to a temperature higher than the melting temperature of the second resin R2 but lower than the melting temperature of the first resin R1, thereby softening and smoothing the second resin portion 30B. This allows the second resin portion 30B to have a glossier surface than the first resin portion 30A, while leaving fine irregularities 38 on the first resin portion 30A. In this way, this manufacturing method for the skin material 30 is suitable for manufacturing skin materials 30 that can express new designs.

[0058] Other Embodiments In the above embodiment, the first resin R1 is a polyvinyl chloride resin, and the second resin R2 is an acrylic resin. However, this is not limiting. For example, the first resin R1 and the second resin R2 may be a combination of polyurethane (PU), polyethylene (PE), polypropylene (PP), acrylic butadiene styrene (ABS resin), polycarbonate (PC), and polyethylene terephthalate (PET). The key is that the melting temperature of the second resin R2 is lower than that of the first resin R1, and the second resin portion 30B is formed smoother than the first resin portion 30A by softening it through a heat treatment after molding the skin material 30.

[0059] In the above embodiment, the acrylic resin contained in the skin material 30 as the second resin R2 functions as a tactile feel improver, but this is not limitative. The second resin R2 does not have to be contained in the skin material 30 in order to function as a tactile feel improver or other modifying aid.

[0060] In the above embodiment, the skin material 30 is attached to the base material 10 without using an adhesive, but this is not limited to this. For example, the skin material 30 may be attached to the base material 10 by bonding its outer periphery to the side wall portion 14 or the back surface of the base material 10 using an adhesive.

[0061] In the above embodiment, the decorative panel 7 has been described as an example of a vehicle interior part according to the present disclosure, but the present disclosure is not limited to this. The technology of the present disclosure can also be applied to other vehicle interior parts, such as an instrument panel body, a console box lid or door trim, and a pillar trim. Furthermore, the technology of the present disclosure can also be widely applied to products other than vehicle interior parts, such as home appliances and furniture, as long as they are configured to include the skin material 30.

[0062] As described above, preferred embodiments have been described as examples of the technology of the present disclosure. However, the technology of the present disclosure is not limited to these, and can be applied to embodiments in which appropriate modifications, substitutions, additions, omissions, etc. are made. It will be understood by those skilled in the art that various modifications are possible to the above-described embodiments without departing from the spirit of the technology of the present disclosure, and that such modifications also fall within the scope of the technology of the present disclosure.

[0063] Note that the above descriptions such as "first," "second," etc. are merely used to distinguish the terms to which they are attached, and do not limit the number or order of the terms. Furthermore, the use of "to" in the above-described ranges of values ​​means a range that includes the values ​​before and after it. In other words, if X and Y are used as substitutes for numerical values, then "X~Y" indicates a range of "greater than or equal to X and less than or equal to Y." [Industrial Applicability]

[0064] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for a slush-molded skin material, a vehicle interior part including the same, and a method for manufacturing a skin material. [Explanation of symbols]

[0065] RM powder resin raw material R1 First Resin R2 2nd resin 7. Decoration panels (vehicle interior parts) 30 Skin material (slush molding skin material) 30A 1st resin part 30B 2nd resin part 38 Unevenness 40 Molten resin layer 100 Slush Molding Mold 106 Molding surface 108 Unevenness

Claims

1. A first resin (R1) as a main component; a second resin (R2) having a melting temperature lower than that of the first resin (R1), a slush-molded skin material having a surface on which a first resin portion (30A) made of the first resin (R1) and a second resin portion (30B) made of the second resin (R2) are exposed, and on which fine irregularities (38) are formed, The irregularities (38) are formed on the first resin portion (30A), the second resin portion (30B) is formed smoother than the first resin portion (30A); A slush-molded skin material characterized by:

2. The slush-molded skin material according to claim 1, The second resin portions (30B) have surfaces facing in different directions and are scattered on the surface of the skin material (30). A slush-molded skin material characterized by:

3. The slush-molded skin material according to claim 1, the temperature difference between the melting temperature of the first resin (R1) and the melting temperature of the second resin (R2) is 30°C or more; A slush-molded skin material characterized by:

4. The slush-molded skin material according to claim 1, the first resin (R1) is a polyvinyl chloride resin, The second resin (R2) is an acrylic resin. A slush-molded skin material characterized by:

5. An interior part for a vehicle having a skin material (30), The skin material (30) is a slush-molded skin material (30) according to any one of claims 1 to 4. A vehicle interior part characterized by:

6. A method for manufacturing a resin skin material (30) using a powder slush molding method, comprising the steps of: a mold heating step of heating a slush molding mold (100) having a molding surface (106) on which fine irregularities (108) are formed; a melting step of supplying a powdered resin raw material (RM) containing a mixture of powder of a first resin (R1) as a main component and powder of a second resin (R2) having a melting temperature lower than that of the first resin (R1) onto the molding surface (106) of the slush molding mold (100) heated in the mold heating step, and adhering and melting the powdered resin raw material (RM) to form a molten resin layer (40); a cooling step of solidifying the molten resin layer (40) formed in the melting step by cooling, thereby forming the skin material (30) in which a first resin portion (30A) made of the first resin (R1) and a second resin portion (30B) made of the second resin (R2) are exposed on the surface and the irregularities (108) are transferred to the surface; a demolding step of removing the skin material (30) obtained in the cooling step from the slush molding die (100); a smoothing step of heating the surface of the skin material (30) removed from the slush molding die (100) in the demolding step to a temperature higher than the melting temperature of the second resin (R2) and lower than the melting temperature of the first resin (R1) to soften and smooth the second resin portion (30B), A method for producing a skin material comprising the steps of:

Images