JP2015020368A - Resin molded article, manufacturing method thereof, and printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin molded article that reduces color tone changes called surface irregularities that appear on the outer surface corresponding to a boundary between a region having a repeating pattern of a concave and a projection and a region without a pattern on a non-appearance side surface.SOLUTION: A resin molded article includes an appearance surface and a non-appearance surface having a wall thickness of 3.1 mm or less inbetween, a projection of a height of 1 mm or more, and a concave of a height of 0.3 mm or more on at least one of the appearance surface and the non-appearance surface. The non-appearance surface has a pattern repeating region, a transition region, and a non-pattern region adjacent to the projection or the concave. The pattern repeating region has a repeated pattern with a unit shape of one of the projection or concave of a height of 0.01 mm or more and 1 mm or less and a width less than that of the resin molded article. The transition region has a strip of the non-pattern part and a strip of the pattern repeating part with the unit shape.

Description

  The present invention relates to a resin molded product, a manufacturing method thereof, and a printer, and more specifically, a resin molded product by plate-like or box-shaped injection molding in which appearance quality is important, a manufacturing method thereof, and the resin molded product are used. Regarding printers.

  Plate-like or box-shaped resin molded products have rib-like projections for reinforcement and positioning on the non-external surface, and protrusions or depressions such as steps due to ejector pins, and arrows on the external surface to guide the product functions to the user There may be various uneven shapes such as protrusions or depressions in the shape. The appearance surface referred to here is a surface that requires a quality of appearance in order to touch the user's eyes, and the non-appearance surface refers to the back surface of the appearance surface.

  At the time of injection molding, the flow of resin injected into the mold cavity from the injection gate is disturbed by the protrusions or depressions. As a result, an appearance surface corresponding to the back side of the protrusions or depressions on the non-appearance surface, or a portion with a changed color tone called unevenness may occur near the protrusions or depressions on the appearance surface.

  For this unevenness, a method has been proposed in which unevenness can be improved by arranging a repeating pattern of convex portions or concave portions on the non-appearance surface (Patent Document 1).

  In addition, as a means of avoiding color change of the appearance surface, particularly jetting, a molding die provided with a resin flow rate lowering means such as a concavo-convex shape at a location where the resin flow speed increases with respect to the cavity forming the non-appearance surface There has been proposed a method of molding using a material (Patent Document 2).

EP2465658 JP 2001-277303 A

  However, the method of Patent Document 1 improves appearance defects caused by protrusions or depressions on the appearance surface or protrusions or depressions on the non-appearance surface, but due to reasons such as product design and inclined core, the non-appearance surface It is not possible to improve the appearance defect that occurs at the boundary between the repeated pattern region and the non-pattern region of the convex part or concave part. In addition, the method of Patent Document 2 improves appearance defects caused by an increase in resin flow rate such as jetting, but there remains a problem with improvement of unevenness caused by disturbance of resin flow.

  The present invention relates to a resin molded product in which a change in color tone called appearance unevenness that occurs on an appearance surface corresponding to the boundary between a region having a repetitive pattern of convex portions or concave portions on a non-appearance surface and a non-pattern region is reduced, and a method for manufacturing the same. It is to provide. The present invention also provides a printer using the resin molded product.

  The resin molded product that solves the above problems has an external surface and a non-external surface, and a thickness between the external surface and the non-external surface is 3.1 mm or less, and the external surface or the non-external surface In the resin molded product having a protrusion having a height of 1 mm or more or a recess having a height of 0.3 mm or more on at least one of the protrusion, the non-external surface includes the protrusion or the depression, and a repeated pattern region adjacent to the protrusion or the depression. A non-pattern region, and a transition region existing between the repetitive pattern region and the non-pattern region, the repetitive pattern region having a height of 0.01 mm to 1 mm and a width of the resin molded product A transition pattern having at least one of a smaller convex part or concave part as a unit shape, the transition region having a height of 0.01 mm or more and 1 mm or less and a width that is larger than the width of the resin molded product A repeated pattern portion to again projections or recesses of at least one unit shape, and having a non-pattern portion.

  A method of manufacturing a resin molded product that solves the above problem is a method of manufacturing a resin molded product by molding the above resin molded product using a mold, and the V-shaped and / or balls are formed on the mold. A groove for forming a convex portion or a concave portion is formed by scanning an end mill having a shape.

  A printer that solves the above-described problems is characterized in that the resin molded product described above or the resin molded product manufactured by the method for manufacturing the resin molded product is a document cover.

  According to the present invention, a resin molded article in which a change in color tone called appearance unevenness that occurs on an appearance surface corresponding to the boundary between a region having a repetitive pattern of convex portions or concave portions on a non-appearance surface and a non-pattern region is reduced, and its manufacture A method can be provided. Moreover, according to this invention, the printer using the said resin molded product can be provided.

It is the schematic which shows one embodiment of the resin molded product of this invention. It is the schematic which shows the other embodiment of the resin molded product of this invention. It is the schematic which shows the other embodiment of the resin molded product of this invention. It is the schematic which shows the other embodiment of the resin molded product of this invention. It is the schematic which shows the other embodiment of the resin molded product of this invention. It is the schematic which shows the other embodiment of the resin molded product of this invention. It is the schematic which shows the other embodiment of the resin molded product of this invention. It is the schematic which shows the other embodiment of the resin molded product of this invention. 1 is a perspective view illustrating a printer including a document reading apparatus according to the present invention. FIG. 3 is a perspective view showing a state in which a document cover of the printer according to the invention is opened. It is the schematic which shows the shape of the processus | protrusion or hollow of the non-appearance surface of Examples 7-10.

  Hereinafter, the present invention will be described in detail.

  The resin molded product according to the present invention has an appearance surface and a non-appearance surface, and a thickness between the appearance surface and the non-appearance surface is 3.1 mm or less, and is at least of the appearance surface or the non-appearance surface. In the resin molded product having a protrusion having a height of 1 mm or more or a recess having a height of 0.3 mm or more on one side, the non-external surface has the protrusion or the depression, a repeated pattern region adjacent to the protrusion or the depression, and no A pattern region, and a transition region existing between the repetitive pattern region and the non-pattern region, wherein the repetitive pattern region has a height of 0.01 mm or more and 1 mm or less and a width that is larger than a width of the resin molded product. It has a repetitive pattern having at least one of a small convex part or a concave part as a unit shape, and the transition region is a convex having a height of 0.01 mm or more and 1 mm or less and a width smaller than the width of the resin molded product. Or a repeating pattern portion to at least one of the units shape of the recess, and having a non-pattern portion.

  The unit shape of the repetitive pattern is preferably a quadrangular pyramid.

  FIG. 1 is a schematic view showing an embodiment of the resin molded product of the present invention. FIG. 1A is a schematic view of a resin molded product, and FIG. 1B is a cross-sectional view taken along line A-A ′ in FIG. The resin molded product according to the present invention has an outer surface and a non-outer surface on the front and back sides. FIG. 1 shows a plate-shaped resin molded product having ribs, 1 is a plate-shaped resin molded product, 101 is an external surface having a mirror surface or a textured surface, 102 is a non-external surface, and 2 is a non-external surface of the resin molded product. It is a rib composed of a protrusion protruding from the surface 102. The rib 2, which is a projection that protrudes from a thin, plate-like non-appearance surface, has at least a base portion having a long side and a short side.

  The resin molded product of the present invention has a protrusion having a height of 1 mm or more or a recess having a height of 0.3 mm or more on at least one of the external surface and the non-external surface. In this embodiment, a rib is shown as an example of the protrusion protruding from the non-appearance surface 102 of the resin molded product. However, the base connecting the molded parts is a prism with a prism shape, a cylindrical boss, a spherical protrusion, a cylindrical protrusion or depression with an ejector pin with a circular cross section, and a prismatic shape with an ejector pin with a square cross section. It may be a protrusion or a depression.

  The non-appearance surface 102 exists between the rib 2 that is the protruding protrusion, the repeated pattern region 30 adjacent to the rib 2, the non-pattern region 50, and the repeated pattern region and the non-pattern region. It has a transition region 42.

  Reference numeral 3 denotes a repeating pattern of quadrangular pyramid-shaped concave portions provided on the non-appearance surface 102. Reference numeral 31 denotes a unit shape of a repeated pattern of recesses. B is a width in a direction perpendicular to the long side of the rib of the concave portion, and C is a width in a direction parallel to the long side of the rib of the concave portion. The present invention is characterized in that the width of the recess is smaller than the width of the resin molded product in any direction. That is, using FIG. 1, the width B in the direction perpendicular to the long side of the rib of the recess is smaller than the width of the resin molded product when the resin molded product is cut in the direction perpendicular to the long side of the rib. . Further, the width C in the direction parallel to the long side of the rib of the recess is also smaller than the width of the resin molded product when the resin molded product is cut in the direction parallel to the long side of the rib. Thus, if the width of the concave portion is smaller than the width of the resin molded product in any direction, the disturbance of the resin flow due to the convex portion or the concave portion is not only the thickness direction of the resin molded product but also the convex portion or concave portion. The flow that goes around is generated. Therefore, since it is also complicated in the planar direction of the resin molded product, unevenness generated on the back surface of the rib can be reduced.

  In the present embodiment, an example is shown in which the bottom surface of a quadrangular pyramid-shaped recess has a width C in the direction parallel to the long side of the rib of the recess and a width B in the direction perpendicular to the long side of the rib of the recess of 1.2 mm. ing. Preferably, the width C may be any dimension as long as the width C is in the range of 0.1 mm to 1.8 mm and the width B is in the range of 0.1 mm to 1.8 mm.

  Reference numeral 50 denotes a non-pattern area provided on the non-appearance surface 102. The non-pattern area is a flat surface, and is composed of, for example, a flat plate portion.

  Reference numeral 42 denotes a transition area. Reference numerals 43 and 45 denote band-shaped non-pattern portions provided in the transition region. bb1 and bb2 are widths in the short direction of the non-patterned portion provided in the transition region. The widths of the non-pattern portions 43 and 45 in the transition region gradually increase or are constant as they move from the repeated pattern region 30 toward the non-pattern region 50.

  44 and 46 are repetitive strips having a unit shape of at least one of a convex portion or a concave portion provided in the transition region 42 having a height of 0.01 mm to 1 mm and a width smaller than the width of the resin molded product. It is a pattern part. ba1 and ba2 are widths in the short-side direction of the repeated pattern portion provided in the transition region. The width of the repetitive pattern portion of the transition region gradually decreases or is constant as it goes from the repetitive pattern region 30 to the non-pattern region 50.

  The shape of the repeated pattern portion and the non-pattern portion of the transition region is preferably a band shape, a triangle shape, a quadrilateral shape, a polygonal shape, a hollow circular shape, or a hollow elliptical shape.

  In the present invention, the height of the unit shape of the repetitive pattern represents the difference in the unevenness of the repetitive pattern of the convex portion or the concave portion (the distance from the top of the convex portion to the bottom of the recess), specifically, the height indicated by h. That's it. The height h is 0.01 mm or more and 1 mm or less, preferably 0.05 mm or more and 0.5 mm or less.

  The present invention is characterized in that the width of the recess is smaller than the width of the resin molded product in any direction. In other words, using FIG. 1, the width B of the recess is smaller than the width X of the A-A ′ section obtained by cutting the resin molded product. Further, the widths bb1 and bb2 of the non-pattern part provided in the transition region are the same, and the width ba2 of the repeated pattern part provided in the transition region is characterized by being smaller than ba1. In addition, in the transition region, the unit shape of the repeated pattern is constant except when the shape changes due to the non-pattern part.

  As the width of the repeated pattern portion provided in the transition region 42 gradually decreases toward the non-pattern region 50 in this manner, the disturbance of the resin flow gradually decreases, and occurs at the boundary between the repeated pattern region 30 and the non-pattern region 50. Unevenness can be reduced. And the resin molded product which reduced the change of the color tone called the external appearance nonuniformity which generate | occur | produces in the external appearance surface equivalent to the boundary of the area | region which has a repeating pattern of the convex part or recessed part of a non-appearance surface, and a non-pattern area | region can be obtained.

  In FIG.1 (b), 103 shows the thickness between the appearance surface 101 and the non-appearance surface 102, and when the said thickness 103 is 3.1 mm or less, Preferably it is 0.5 mm or more and 2.8 mm or less. The effects of the present invention are best manifested. When the wall thickness 103 exceeds 3.1 mm, the influence of the disturbance of the molten resin due to the ribs 2 does not reach the appearance surface, and unevenness hardly occurs.

  In the present invention, the unit-shaped convex portion or concave portion of the repeated pattern region is formed from a pyramidal shape, a conical shape, a polygonal column shape, a cylindrical shape, a spherical crown shape, a hemispherical shape, and a conical shape whose side faces are curved surfaces. It may be. Further, the convex portion or concave portion of the transition region may be the same as or different from the shape of the convex portion or concave portion of the unit shape of the repeated pattern region.

  FIG. 2 is a schematic view showing another embodiment of the resin molded product of the present invention. 2A is a perspective view of the resin molded product of the present invention, and FIG. 2B is a cross-sectional view taken along the line D-D ′ of FIG. In the resin molded product shown in FIG. 2, the width bb2 in the short direction of the non-patterned portion 45 provided in the transition region 42 is larger than the width bb1 of the non-patterned portion 43. The width ba2 of the repeated pattern portion 46 provided in the transition region is the same as the width ba1 of the repeated pattern portion 44. Thus, even if the width of the strip-shaped non-pattern portion provided in the transition region gradually increases toward the non-pattern region, the effect of the present invention can be obtained.

  FIG. 3 is a schematic view showing another embodiment of the resin molded product of the present invention. FIG. 3A is a perspective view of the resin molded product of the present invention, and FIG. 3B is an E-E ′ cross section of FIG. This example shows a resin molded product in which the side surface of the repeated pattern of the recesses is a curved surface in FIG.

  FIG. 4 is a schematic view showing another embodiment of the resin molded product of the present invention. 4A is a perspective view of the resin molded product of the present invention, and FIG. 4B is a cross-sectional view taken along line F-F ′ in FIG. This example shows a resin molded product in which the side surface of the repeated pattern of the recesses is a curved surface in FIG.

  FIG. 5 is a schematic view showing another embodiment of the resin molded product of the present invention. Fig.5 (a) is a perspective view of the resin molded product of this invention, FIG.5 (b) is a top view of Fig.5 (a). In the embodiment of FIG. 5, the strip-shaped non-pattern portion 43 and the strip-shaped repetitive pattern portion 44 provided in the transition region 42 are provided in a direction perpendicular to the boundary of the non-pattern region 50. It is a feature. ca1 and ca3 are widths in the short-side direction of the repeated pattern portion 44 at locations in contact with the repeated pattern region. ca2 is the width in the short-side direction of the non-patterned portion 43 at a location in contact with the repeated pattern region. cb1 and cb3 are widths in the short-side direction of the repetitive pattern portion 44 at locations in contact with the non-pattern areas. cb <b> 2 is the width in the short direction of the non-patterned portion 43 at a location in contact with the non-patterned region. The widths ca1 and ca3 and cb1 and cb3 of the repeated pattern portion are the same. The widths ca2 and cb2 of the non-pattern part are the same.

  FIG. 6 is a schematic view showing another embodiment of the resin molded product of the present invention. 6A is a perspective view of the resin molded product of the present invention, and FIG. 6B is a top view of FIG. 6A. In the embodiment of FIG. 6, a pair of short sides provided in the transition region 42 are parallel to each other, and the trapezoidal non-patterned portion 43 made of a quadrilateral having a long long side and the trapezoidal repetitive pattern portion 44 include the non-patterned region 50. It is characterized by being provided in a direction perpendicular to the boundary. The widths ca1 and ca3 of the repeated pattern portion 44 are the same. The widths cb1 and cb3 of the repeated pattern portion 44 are the same. The width cb <b> 1 is smaller than the width ca <b> 1, so that the width of the repeated pattern portion gradually decreases from the repeated pattern region 30 toward the non-pattern region 50. Further, the width cb <b> 2 of the non-pattern portion 43 is larger than the width ca <b> 2 and gradually increases from the repeated pattern region 30 toward the non-pattern region 50.

  FIG. 7 is a schematic view showing another embodiment of the resin molded product of the present invention. Fig.7 (a) is a perspective view of the resin molded product of this invention, FIG.7 (b) is a top view of Fig.7 (a). The embodiment shown in FIG. 7 (a) is characterized by a shape combining FIG. 5 (a) and FIG. 6 (a). As described above, the strip-shaped non-pattern portion or the repeated pattern portion may be combined with various shapes. In FIG. 7B, ca1, ca2, ca3 and cb1, cb2, and cb3 are the same as ca1, ca2, ca3, cb1, cb2, and cb3 in FIG. 6B. In FIG. 7B, ca1 ', ca2', ca3 'and cb1', cb2 ', cb3' are the same as ca1, ca2, ca3 and cb1, cb2, cb3 in Fig. 5B.

  FIG. 8 is a schematic view showing another embodiment of the resin molded product of the present invention. Fig.8 (a) is a perspective view of the resin molded product of this invention, FIG.8 (b) is a top view of Fig.8 (a). The embodiment of FIG. 8A is characterized in that the shape of the non-patterned region of FIG. 1A is circular and the transition region is a hollow circular shape formed so as to surround the non-patterned region. To do. As described above, even when the unit shape is incomplete due to the non-pattern portion in the transition region, the unevenness can be reduced.

  The method for producing a resin molded product of the present invention is a method for producing a resin molded product by molding the above resin molded product using a mold, and the V-shaped and / or ball-shaped end mill is formed on the mold. By forming a groove, a groove for forming a convex portion or a concave portion is formed.

  Next, the manufacturing method for manufacturing the resin molded product of this invention is demonstrated. The resin molded product of the present invention can be produced by a known injection molding method. The repeating pattern of the convex portion or the concave portion and the convex portion or the concave portion group include, for example, a depression formed in a mold constituting a cavity for transferring the non-appearance surface (the rib is formed by transferring the depression). ) To scan the V-shaped end mill. Thereafter, by scanning the end mill while changing the angle in the scanning direction, a repeating pattern of convex portions or concave portions in which convex shapes having a polygonal pyramid shape are arranged, and convex portions or concave portion groups are formed.

  Moreover, the cone shape and columnar shape whose side surfaces are curved surfaces are formed by substituting the ball end mill for the V-shaped end mill. Furthermore, by processing with two types of ball end mills having different diameters, it is possible to form a cone shape or a columnar shape having two curved surfaces. When this is transferred by injection molding or the like, it is possible to manufacture a resin molded product having convex portions or concave patterns in which pyramid-shaped concave portions are arranged and a convex portion or concave group.

  The present invention has the same effect even when the appearance surface is dark. Further, the appearance surface is not limited to the glossy mirror surface, and the same effect can be obtained even if it is a textured surface.

  The present invention is not limited by the mold temperature. The same effect can be obtained even when the mold temperature is about the glass transition temperature of the resin. The same effect can be obtained even when the mold temperature is sufficiently low.

  As the resin material used in the method for producing a resin molded product of the present invention, for example, a thermoplastic resin or the like is used, and specifically ABS, HIPS, PCABS, or the like can be given.

  The printer of the present invention is characterized in that the resin molded product described above or the resin molded product manufactured by the method of manufacturing a resin molded product is used for a document cover. Examples of the printer include a composite printer.

  Next, an Example is shown and this invention is demonstrated concretely.

Example 1
FIG. 9 is a perspective view of a composite printer provided with a document reading apparatus to which the present invention is applied. Reference numeral 300 denotes a composite printer, and a casing 400 such as a document cover 403 is formed of black resin, and the surface thereof is a mirror surface. FIG. 10 is a perspective view showing a state in which a document cover to which the present invention is applied is opened. In this embodiment, the grid-like ribs 2 are provided inside the outermost peripheral rib 501 of the non-external surface 402 of the document cover shown in FIG. 10, and a repeated pattern of convex portions or concave portions is formed. On the outer side of the outermost peripheral rib 501, similarly to FIG. 1, adjacent repeated pattern regions, transition regions, and non-pattern regions were formed.

  The thickness of the document cover 403 was 2.3 mm, and the thickness of the rib 2 was 1.2 mm. The document cover 403 is black, and its external surface 401 is a glossy mirror surface. Molding was performed at a mold temperature of 50 ° C., an injection time of 2.5 s, and a resin temperature of 220 ° C. ABS was used as the resin material.

  The shape of the unit shape part constituting the repeated pattern of the recesses formed inside the outermost peripheral rib 501 of the non-appearance surface 402 was a quadrangular pyramid recess, and the pitch p1 (see FIG. 1) was 1.2 mm.

  In addition, a repetitive pattern region, a transition region, and a non-pattern region are formed adjacent to the outside of the outermost peripheral rib 501 and the height h of the unit shape portion of the repetitive pattern region (width 6.0 mm) is set to 0.1 mm. Outside this area, the non-patterned parts (bb1, bb2) and the repeated pattern parts (ba1, ba2) are arranged in the order of bb1, ba1, bb2, ba2 in the transition region (width 6.0 mm), and the widths bb1, bb2, ba2 are arranged. The width ba1 was set to 1.2 mm and 2.4 mm. Further, a non-pattern area (an area other than the repeated pattern area and the transition area) was formed.

(Example 2)
A document cover was molded under the same conditions as in Example 1 except that the thickness of the document cover 403 was set to 3.0 mm.

Example 3
A document cover was molded under the same conditions as in Example 1 except that the thickness of the document cover 403 was 3.1 mm.

Example 4
A document cover was molded under the same conditions as in Example 1 except that the thickness of the document cover 403 was changed to 0.5 mm.

(Comparative Example 1)
A document cover was formed in the same manner as in Example 1 except that the concave group (repeated pattern portion) provided in the transition region was not disposed outside the outermost peripheral rib 501.

(Comparative Example 2)
A document cover was formed in the same manner as in Example 2 except that the concave group (repeated pattern portion) provided in the transition region was not disposed outside the outermost peripheral rib 501.

(Comparative Example 3)
A document cover was formed in the same manner as in Example 3 except that the concave group (repeated pattern portion) provided in the transition region was not disposed outside the outermost peripheral rib 501.

(Comparative Example 4)
A document cover was formed in the same manner as in Example 4 except that the concave group (repeated pattern portion) provided in the transition region was not disposed outside the outermost peripheral rib 501.

  The results of Example 1 to Example 4 and Comparative Example 1 to Comparative Example 4 are shown in Table 1. The numbers in the table represent luminance deviations. The appearance surface near the unevenness is photographed with a CCD camera, and the unevenness deviation is calculated from the obtained luminance data. The larger the value of the deviation is in the minus direction, the poorer the appearance (with unevenness), and the closer to 0, the better the appearance (improving unevenness). When combined with the result of visual evaluation, it is recognized as unevenness when the deviation is −25 or less. ○ of the evaluation item represents unevenness improvement and × represents presence of unevenness.

(Example 5)
Molding was performed under the same conditions as in Example 1 except that h of the unit shape portion constituting the concave group (repeated pattern region and repeated pattern portion) formed outside the outermost peripheral rib 501 was 1 mm.

(Example 6)
Molding was performed under the same conditions as in Example 1 except that h of the unit shape part constituting the concave group (repeated pattern region and repeated pattern part) formed outside the outermost peripheral rib 501 was 0.01 mm.

(Comparative Example 5)
Molding was performed under the same conditions as in Example 1 except that h of the unit shape portion constituting the concave group (repeated pattern region and repeated pattern portion) formed outside the outermost peripheral rib 501 was 1.1 mm.

(Comparative Example 6)
Molding was performed under the same conditions as in Example 1 except that h of the unit shape portion constituting the concave group (repeated pattern region and repeated pattern portion) formed outside the outermost peripheral rib 501 was 0.009 mm.

  The results of Example 5 to Example 6 and Comparative Example 5 to Comparative Example 6 are shown in Table 2.

  Examples 7 to 10 were carried out by changing the protrusions or depressions on the non-appearance surface in various ways. A schematic view of the shape of the protrusions or depressions on the non-appearance surface is shown in FIG.

(Example 7)
The document is subjected to the same conditions as in the first embodiment except that the rib 2 (see FIG. 11A) of the non-external surface 402 implemented in the first embodiment is a boss 600 having a circular cross section (see FIG. 11B). A cover was molded.

(Example 8)
The original document is subjected to the same conditions as in the first embodiment except that the rib 2 (see FIG. 11A) of the non-appearance surface 402 implemented in the first embodiment is a connection claw 601 having a square cross-sectional shape (FIG. 11C). A cover was molded.

Example 9
The same conditions as in Example 1 except that the rib 2 (see FIG. 11A) of the non-external surface 402 implemented in Example 1 is a protrusion 602 (see FIG. 11D) formed by an ejector pin and a cavity. The original cover was molded with

(Example 10)
The same conditions as in Example 1 except that the rib 2 (see FIG. 11 (a)) of the non-external surface 402 implemented in Example 1 was a recess 603 (see FIG. 11 (e)) formed by an ejector pin and a cavity. The original cover was molded with

(Comparative Example 7)
A document cover was molded in the same manner as in Example 7 except that the concave group provided in the transition region was not formed on the non-appearance surface 402.

(Comparative Example 8)
A document cover was molded in the same manner as in Example 8 except that the concave group provided in the transition region was not formed on the non-appearance surface 402.

(Comparative Example 9)
A document cover was formed in the same manner as in Example 9 except that the concave group provided in the transition area was not formed on the non-appearance surface 402.

(Comparative Example 10)
A document cover was molded in the same manner as in Example 10 except that the concave group provided in the transition region was not formed on the non-appearance surface 402.

  Table 3 shows the results of Example 7 to Example 10 and Comparative Example 7 to Comparative Example 10. Moreover, the schematic of the protrusion or the hollow of the external appearance surface or non-appearance surface of Example 1, Example 7 to Example 10 is shown in FIG.

(Example 11)
A non-pattern part (bb1, bb2) and a repetitive pattern part (ba1, ba2) are arranged in the order of the width bb1, ba1, bb2, ba2 of the unit shape part in the transition region formed outside the outermost peripheral rib 501. Molding was performed under the same conditions as in Example 1 except that the widths bb1, ba1, and ba2 of the shape portions were 1.2 mm and bb2 was 2.4 mm.

(Reference Example 1)
A non-pattern part (bb1, bb2) and a repetitive pattern part (ba1, ba2) are arranged in the order of the width bb1, ba1, bb2, ba2 of the unit shape part in the transition region formed outside the outermost peripheral rib 501. Molding was performed under the same conditions as in Example 1 except that bb2, ba1, and ba2 of the shape portion were 1.2 mm and bb1 was 2.4 mm.

  The results of Example 11 and Reference Example 1 are shown in Table 4.

(Example 12)
As shown in FIG. 6, a non-pattern part (ca2-cb2) and a repetitive pattern part (ca1-cb1, ca3-cb3) are formed in a transition region formed outside the outermost peripheral rib 501 and ca1, ca2, Molding was performed under the same conditions as in Example 1 except that ca3 was 1.2 mm, cb1 and cb3 were 0.6 mm, and cb2 was 2.4 mm.

(Reference Example 2)
As shown in FIG. 6, a non-pattern part (ca2-cb2) and a repetitive pattern part (ca1-cb1, ca3-cb3) are formed in a transition region formed outside the outermost peripheral rib 501 and ca1, ca2, Molding was performed under the same conditions as in Example 1 except that ca3 was 1.2 mm, cb1 and cb3 were 1.5 mm, and cb2 was 0.6 mm.

  The results of Example 12 and Reference Example 2 are shown in Table 5.

(Example 13)
As shown in FIG. 8, the non-pattern part (bb1, bb2) and the repeated pattern part (ba1, ba2) are formed in the transition region formed inside the outermost peripheral rib 501 and the widths bb1, ba1, bb2, Molded under the same conditions as in Example 1 except that they are arranged in the order of ba2, the widths bb1, bb2, and ba2 of the unit shape portions are 1.2 mm, ba1 is 2.4 mm, and the shape of the non-pattern area is circular. did.

(Reference Example 3)
As shown in FIG. 8, the non-pattern part (bb1, bb2) and the repeated pattern part (ba1, ba2) are formed in the transition region formed inside the outermost peripheral rib 501 and the widths bb1, ba1, bb2, Molded under the same conditions as in Example 1 except that they are arranged in the order of ba2, the widths bb1, bb2, and ba1 of the unit shape portions are 1.2 mm, ba2 is 2.4 mm, and the shape of the non-pattern area is circular. did.

  The results of Example 13 and Reference Example 3 are shown in Table 6.

  As described above, the occurrence of unevenness can be improved by the recess groups provided in the transition region.

  The present invention provides an original cover of an original reading apparatus, an original cover of a composite printer equipped with the original reading apparatus, and a resin molded product that requires a dark design surface in a resin casing of various apparatuses. It can be widely applied to resin molded products that require a highly functional surface that is not permitted.

DESCRIPTION OF SYMBOLS 1 Resin molded product 2 Rib 3 Repetitive pattern of recessed part 30 Repeated pattern area 31 Unit shape which comprises the repeated pattern of recessed part 42 Transition area | region 43 No-pattern part 44 Repeat pattern part 45 Non-pattern part 46 Repeat pattern part 50 Non-pattern area 101 Appearance Surface 102 Non-appearance surface 300 Composite printer 400 Main body of composite printer 401 Appearance surface of molded product 402 Non-appearance surface of molded product 403 Document cover 501 Outermost peripheral rib 600 Boss 601 Claw 602 Step height of projection formed by ejector pin and cavity 603 Indentation step formed by ejector pin and cavity

Claims (7)

  A protrusion having a height of 1 mm or more on at least one of the external surface or the non-appearance surface, and having a thickness between the external appearance surface and the non-appearance surface of 3.1 mm or less. In the resin molded product having a recess having a height of 0.3 mm or more, the non-appearance surface includes the protrusion or the recess, a repeated pattern region adjacent to the protrusion or the recess, a non-pattern region, and the repeated pattern region. The transition pattern area exists between the non-pattern areas, and the repetitive pattern area has at least one of a convex part or a concave part having a height of 0.01 mm to 1 mm and a width smaller than the width of the resin molded product. A transition pattern having a unit shape, wherein the transition region has a height of 0.01 mm to 1 mm and a width that is at least one of a convex portion or a concave portion that is smaller than the width of the resin molded product. A repeated pattern portion in units shape, a resin molded article characterized by having a non-pattern portion.   2. The resin molded product according to claim 1, wherein the shape of the repeated pattern portion and the non-pattern portion of the transition region is a band shape, a triangle shape, a quadrilateral shape, a polygonal shape, a hollow circular shape, or a hollow elliptical shape.   The resin molded product according to claim 1 or 2, wherein the unit shape of the repetitive pattern is a quadrangular pyramid.   4. The resin molding according to claim 1, wherein the width of the non-pattern part of the transition region is gradually increased or constant as it goes from the repetitive pattern region to the non-pattern region. 5. Goods.   4. The resin molding according to claim 1, wherein the width of the repetitive pattern portion of the transition region is gradually reduced or constant as it goes from the repetitive pattern region to the non-pattern region. Goods.   A method for producing a resin molded product, wherein the resin molded product according to claim 1 is molded using a mold, wherein the mold is scanned with a V-shaped and / or ball-shaped end mill. A method for producing a resin molded product, comprising forming a groove for molding a recess.   A printer, wherein the resin molded product according to any one of claims 1 to 5 or the resin molded product manufactured by the method for manufacturing a resin molded product according to claim 6 is a document cover.

Images