JP2018192706A - Resin molded article - Google Patents

Abstract

To provide a resin molded article which is prone to irregular reflection of complicated light easily on a surface subjected to an embossed pattern and exhibits a high gloss reduction effect.SOLUTION: A resin molded article 10 has: a base portion 11; a plurality of first protrusions 12 constituting an embossed pattern formed on a surface 11A of the base portion 11; and a plurality of second protrusions 13 formed on the surface 11A of the base portion 11 between the plurality of first protrusions 12 and having a smaller height than the first protrusions 12. Each of the second protrusions 13 has a square spindle shape, and an apex angle θ1 of a cross section along a height direction is in a range of 80° to 120°.SELECTED DRAWING: Figure 1

Description

  The technique disclosed by this specification is related with the resin molded product.

  Some resin molded products used for interior parts for vehicles such as automobile instrument panels and door trims are provided with a texture pattern on the surface thereof. In such a resin molded product, if the surface is glossy, the texture to be created by embossing may be impaired. In addition, when the resin molded product is used for parts around the driver's seat of an automobile, the driver may feel dazzling. Therefore, it is required to suppress the gloss of the surface of such a resin molded product.

  In order to suppress the gloss as described above, a technique for processing the surface of a resin molded product is known so that a low gloss portion (a portion with reduced gloss) is formed between the convex portions of the embossed pattern. Such a low-gloss portion is formed by, for example, regularly providing a large number of minute convex portions using a mold having a circular concave portion formed by etching on the resin surface forming surface. Is configured to reduce gloss by scattering. An example of such a technique is described in Patent Document 1 below.

JP2013-139091A

  However, when the minute projections are formed using the mold as described above, the minute projections have a dome shape, and thus there is a problem that the gloss reduction effect due to the irregular reflection of light on the minute projections cannot be sufficiently obtained. It was.

  The technology disclosed in this specification has been completed based on the above-described circumstances, and it is easy to cause irregular reflection of complex light on the surface on which a wrinkle pattern is applied, and exhibits a high gloss reduction effect. An object of the present invention is to provide a molded resin product.

  The resin molded product disclosed in this specification includes a base, a plurality of first protrusions constituting a texture pattern formed on a surface of the base, and a plurality of the first protrusions, A plurality of second convex portions formed on the surface and having a height smaller than that of the first convex portion, each having a polygonal pyramid shape, and an apex angle of a cross section along the height direction of 80 ° to 120 °. A plurality of second convex portions in a range of °.

  The 2nd convex part provided between the 1st convex parts which constitute the above-mentioned grain pattern has a polygonal pyramid shape, and the vertical angle of the section along the height direction is the range of 80 degrees-120 degrees Therefore, as compared with a dome-shaped convex portion without corners, more complicated irregular reflection of light is likely to occur, and the amount of reflected light close to regular reflection can be reduced. Therefore, a higher gloss reduction effect can be exhibited.

  In the resin molded product, the plurality of second convex portions may be provided such that no gap is formed between the adjacent bases. If there is a gap between the bases, light will be reflected near the regular reflection on the surface of the base in the gap, but by reducing such a gap, the amount of reflected light near the regular reflection can be reduced. It can be reduced, and a higher gloss reduction effect can be exhibited.

  In the resin molded product, the plurality of second convex portions may be provided on the entire surface of the base portion between the plurality of first convex portions. By providing the second protrusion on the entire surface of the base between the first protrusions, it is possible to easily cause irregular reflection of more complex light, and to reduce the amount of light that is reflected close to regular reflection. Therefore, a higher gloss reduction effect can be exhibited.

  In the resin molded product, each of the plurality of first protrusions has a height in a range of 100 μm to 200 μm, and each of the plurality of second protrusions has a height in a range of 50 μm to 100 μm. May be. By forming the first convex portion and the second convex portion so as to have the above height relationship, the second convex portion is prevented from deteriorating the appearance and texture of the embossed pattern formed by the first convex portion. Therefore, the gloss reduction effect can be exhibited without reducing the texture due to the embossed pattern. Moreover, the contrast of a wrinkle pattern can be improved by forming the polygonal 2nd convex part by the above height relationships.

  The said resin molded product WHEREIN: Each said height of these 2nd convex parts may be made into the range of 50 micrometers-85 micrometers. By making the height of the second convex portion in the above range, it is possible to more reliably prevent the appearance and texture of the texture pattern from being deteriorated.

  In the resin molded product, the base, the plurality of first protrusions, and the plurality of second protrusions may be made of a resin exhibiting black. The reduction in gloss and the improvement in contrast due to the above-described second convex portion can achieve a higher effect in the synthetic resin exhibiting black.

  According to the technology disclosed in the present specification, it is possible to provide a resin molded product that easily causes irregular reflection of complex light on the surface on which a texture pattern is applied, and exhibits a high gloss reduction effect.

Schematic sectional view showing a resin molded product according to Embodiment 1 Sectional drawing which expands and shows a part of the resin molded product of FIG. The top view which expands and shows the 2nd convex part contained in the resin molded product of FIG. Sectional drawing which expands and shows a 2nd convex part The schematic top view which shows the 2nd convex part of the resin molded product which concerns on Embodiment 2. FIG. Schematic sectional view showing the second convex part The figure which shows an instrumental panel as interior material for vehicles

<Embodiment 1>
The first embodiment will be described with reference to FIGS. 1 to 4 and FIG. The instrumental panel 1 according to the present embodiment is configured by a resin molded product 10 having a configuration in which gloss is suppressed, and the resin molded product 10 is made of a synthetic resin (for example, a thermoplastic resin such as polypropylene) and exhibits a black color. It is supposed to be. The resin molded product 10 is used for vehicle interior materials such as door trims and other resin products, in addition to the instrument panel 1 as in the present embodiment.

  As shown in FIG. 7, the instrument panel 1 is disposed directly under the front window 2. That is, the instrument panel 1 is disposed in a position where a relatively large amount of external light is irradiated in the vehicle interior.

  As shown in FIGS. 1 and 2, the resin molded product 10 includes a base 11, a plurality of first protrusions 12, and a plurality of second protrusions 13. The base portion 11 is a portion that forms the basis of the resin molded product 10, and the first convex portion 12 and the second convex portion 13 are formed on the surface 11 </ b> A of the base portion 11. The first convex portion 12 forms a texture pattern on the surface 11 </ b> A of the base portion 11. A plurality of second convex portions 13 are arranged between a plurality of adjacent first convex portions 12.

  Each first convex portion 12 has a trapezoidal cross section along the height direction, and is a height that is a distance between a base end portion (a trapezoid lower base) and an upper surface (a trapezoid upper base). H1 is set in the range of 100 μm to 200 μm. As described above, the first convex portion 12 forms a texture pattern, and the dimensions other than the height are different from each other.

  As shown in FIGS. 3 and 4, each second convex portion 13 has a quadrangular pyramid shape (an example of a polygonal pyramid shape), and a cross section along the height direction forms a triangle. A height H2 that is a distance between the base end (the base of the triangle) and the apex is set to be smaller than the height of the first convex portion 12. Specifically, the height H2 is set in the range of 50 μm to 100 μm, and more preferably in the range of 50 μm to 85 μm. The apex angle θ1 is set in the range of 80 ° to 120 °. The 2nd convex part 13 is provided in the whole surface 11A of the base 11 between the 1st convex parts 12 so that a clearance gap may not be formed between the mutually adjacent bases.

  The 2nd convex part 13 is formed using the shaping | molding die which has a recessed part formed by laser processing. Laser processing can form a concave portion having a more complicated shape as compared with the case where the concave portion is provided in the mold by etching. For example, when a mold having a recess formed by etching is used, it is difficult to form a quadrangular pyramid-shaped convex portion having an apex angle like the second convex portion 13.

  In that respect, since the second convex portion 13 of the present embodiment is formed using a mold having a concave portion formed by laser processing, the second convex portion 13 has an apex angle, and has a predetermined height H2 and apex angle θ1. It has a square pyramid shape.

  Next, the effect of this embodiment will be described. The arrows in FIG. 2 indicate light directed to the second convex portion 13 and reflected light reflected by the surface of the second convex portion 13. If the second convex portion is not provided on the surface 11A of the base portion 11, the surface 11A of the base portion 11 between the first convex portions 12 is a relatively smooth surface. Therefore, the light that has reached the surface 11A is likely to cause reflection close to regular reflection. The more reflected light that is close to specular reflection, the more the surface 11A appears to be more glossy. Therefore, by reducing the amount of light that is close to specular reflection, that is, by scattering light, the gloss of the surface 11A. As a result, the gloss of the resin molded product 10 can be reduced.

  Therefore, in the present embodiment, the plurality of second convex portions 13 are provided on the surface 11 </ b> A of the base portion 11 between the first convex portions 12. Since the second convex portion 13 has a quadrangular pyramid shape, the light reaching the second convex portion 13 causes irregular reflection as indicated by the arrow in FIG. That is, the amount of reflected light close to the regular reflection of the light incident between the first convex portions 12 can be reduced by the second convex portions 13. Thereby, the glossiness of the resin molded product 10 can be reduced.

  In addition, since the instrument panel 1 is disposed in a position in the vehicle interior where a relatively large amount of external light is irradiated, the amount of reflected light that is close to regular reflection when the instrument panel 1 is irradiated with external light. When there are many, there is a possibility that the driver may feel dazzling. As described above, since the resin molded product 10 constituting the instrument panel 1 can reduce the amount of reflected light close to regular reflection by the second convex portion 13, the instrument panel 1 is irradiated with external light. It is possible to reduce the glare that the driver feels when it is performed.

  Here, as described above, when a mold having a concave portion formed by etching is used, the convex portion formed on the surface of the resin molded product has an angle such as the apex angle of the second convex portion 13. It is formed in a dome shape that does not. Since the second convex portion 13 has a quadrangular pyramid shape, it is more likely to cause more complicated irregular reflection of light than the convex portion having a dome shape, and less reflected light is close to regular reflection, and thus higher gloss reduction. The effect can be demonstrated.

  In addition, when there is a gap between the adjacent second convex portions 13, there is a high possibility that reflection close to regular reflection will occur due to the relatively smooth surface 11A. In that respect, since the 2nd convex part 13 is provided so that a crevice may not be formed between mutually adjacent bottom sides, the amount of reflected light near regular reflection can be reduced, and a higher gloss reduction effect can be achieved. It can be demonstrated.

  Even when the second convex portion 13 is provided only on a part of the surface 11A between the first convex portions, there is a high possibility that reflection close to regular reflection occurs due to the relatively smooth surface 11A. Since the second convex portion 13 is provided on the entire surface 11A between the first convex portions, the amount of reflected light close to regular reflection can be reduced, and a higher gloss reduction effect can be exhibited. Can do.

  Further, since the height H2 of the second convex portion 13 is set to be smaller than the height H1 of the first convex portion 12, the appearance of the embossed pattern in which the second convex portion 13 is formed by the first convex portion 12. Can be prevented from lowering. Therefore, the gloss reduction effect can be exhibited without deteriorating the texture due to the texture pattern. Furthermore, the contrast of the embossed pattern can be improved by forming the second projecting portion 13 with the above-described height relationship between the first projecting portions 12 constituting the embossed pattern. In addition, by setting the height of the second convex portion 13 in the range of 50 μm to 85 μm, it is possible to improve the contrast and prevent the appearance and texture of the texture pattern from being deteriorated more reliably.

  Moreover, although the resin molded product 10 consists of a synthetic resin which exhibits black, the reduction | decrease of the glossiness and the improvement of contrast by the 2nd convex part 13 can acquire a higher effect in the synthetic resin which exhibits black.

<Embodiment 2>
Next, Embodiment 2 will be described with reference to FIGS. The resin molded product 100 according to the present embodiment has a second convex portion 113 having a configuration different from that of the second convex portion 13 of the first embodiment. In addition, the description which overlaps about the structure, an effect | action, and effect similar to the said Embodiment 1 is abbreviate | omitted.

  Each 2nd convex part 113 in this embodiment has hexagonal pyramid shape (an example of polygonal pyramid shape), and the cross section along the height direction has comprised the triangle. A height H3 that is a distance between the base end portion and the apex is set to be smaller than the height of the first convex portion 12. Specifically, the height H3 is set in the range of 50 μm to 100 μm, and more preferably in the range of 50 μm to 85 μm. The apex angle θ2 is set in the range of 80 ° to 120 °. The 2nd convex part 113 is provided in the whole surface 11A of the base 11 between the 1st convex parts 12 so that a clearance gap may not be formed between the mutually adjacent bases.

  Thus, by making the 2nd convex part 113 into a hexagonal pyramid shape, compared with the 2nd convex part 13 of Embodiment 1, it is easy to raise | generate the irregular reflection of more complicated light, and there are few reflected lights near regular reflection. , Higher gloss reduction effect can be exhibited. Moreover, compared with the 2nd convex part 13, the contrast of a wrinkle pattern can be improved more.

<Other embodiments>
The scope of the technology disclosed by this specification is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the scope of the technology disclosed by this specification. .

  (1) The shape of the second convex portion 13 may be a polygonal pyramid shape other than a quadrangular pyramid shape and a hexagonal pyramid shape. Moreover, the front-end | tip part of the 2nd convex part 13 may be roundish.

  (2) The second convex portion 13 may have a slight gap between adjacent bases, and may not be provided on the entire surface 11 </ b> A of the base 11 between the first convex portions 12.

  (3) The resin molded product 10 is not limited to one made of a resin exhibiting black, and may be made of a resin other than black. However, the 2nd convex part 13 can exhibit a higher effect in the resin molded product which consists of resin which exhibits a dark color.

  (4) The scope of application of the technology disclosed in this specification is not limited to vehicle interior materials, and can be applied to, for example, vehicle interior materials and residential interior materials other than vehicles. Further, the present invention can also be applied to resin products other than interior materials such as housings for electrical appliances.

  DESCRIPTION OF SYMBOLS 1 ... Instrument panel, 2 ... Front window, 10 ... Resin molded article, 11 ... Base part, 11A ... Surface, 12 ... 1st convex part, 13, 113 ... 2nd convex part

Claims (6)

The base,
A plurality of first protrusions constituting a texture pattern formed on the surface of the base;
Between the plurality of first protrusions, a resin molded product including a plurality of second protrusions formed on the surface of the base and having a height smaller than the first protrusions,
Each said 2nd convex part is a resin molded product which has a polygonal pyramid shape, and the vertex angle of the cross section along a height direction is the range of 80 degrees-120 degrees.   The resin molded product according to claim 1, wherein the plurality of second convex portions are provided such that no gap is formed between the bottoms adjacent to each other.   The resin molded product according to claim 1, wherein the plurality of second protrusions are provided on the entire surface of the base portion between the plurality of first protrusions. The height of each of the plurality of first protrusions is in the range of 100 μm to 200 μm,
4. The resin molded product according to claim 1, wherein each of the plurality of second protrusions has a height in a range of 50 μm to 100 μm. 5.   The resin molded product according to claim 4, wherein the height of each of the plurality of second convex portions is in a range of 50 μm to 85 μm.   The resin molded product according to any one of claims 1 to 5, wherein the base, the plurality of first protrusions, and the plurality of second protrusions are made of a resin exhibiting black.

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