JP2009134271A - Plastic molded product - Google Patents

Abstract

An object of the present invention is to obtain a product appearance that is less noticeable of dirt such as fingerprints at low cost without undergoing an additional process after molding without losing the aesthetics of the product obtained by the glossy surface as much as possible.
A scanner device 3 includes a document cover 6 on a main body of the scanner device 6 so that the document cover 6 can freely rotate. An uneven pattern 7 is formed on the surface 6a of the document cover 6 by resin molding. The concavo-convex pattern 7 includes a glossy surface 8 and a non-glossy surface 9 that forms the top surface of the convex portion 10 protruding from the glossy surface 8 and is evenly scattered on the glossy surface 8 at a predetermined ratio per unit area. Is formed. Thus, while the glossy surface 8 provides a glossy appearance to the product appearance, the scattered non-glossy surface 9 can effectively make dirt such as fingerprints less noticeable.
[Selection] Figure 1

Description

  The present invention relates to a resin molded product having a glossy surface formed on the surface.

  When a user purchases a product, if there are multiple products with almost the same function and performance, the final product selection tends to be determined by the appearance of the product. It has become an extremely important factor for product differentiation in the market.

  Conventionally, as a technique for obtaining a high-quality appearance in a resin molded product, a method of performing an additional process such as a coating process after molding, or a resin film at the time of molding as shown in Patent Documents 1 and 2, etc. There is a method of decorating the surface of the molded product by inserting the insert.

Further, Patent Document 3 describes a plastic molded product formed so as to have an appearance substantially equivalent to an appearance surface subjected to a coating process by devising parameters such as glossiness and center roughness of the surface of the molded product. ing. In Patent Documents 4 and 5, as a method of decorating the surface of a molded product, a technique for forming a texture pattern or the like on the surface of a molded product without passing through additional steps after molding by forming irregularities on the mold surface. Is described.
JP-A-11-123739 JP 2005-103794 A JP-A-8-90586 JP-A-11-245233 Japanese Patent Laid-Open No. 7-304062

  By the way, when a deep and glossy (glossy) black (also called jet black) called “Piano Black” is adopted for the product appearance, a high-quality product appearance can be obtained, but such a piano. When black is obtained only by resin molding, there is a problem that molding defects such as weld lines are easily noticeable and it is difficult to obtain optimum molding conditions. Moreover, in order to avoid such a problem, the method of performing an additional process after shaping | molding will increase product cost.

  In addition, when piano black is used in the appearance of the product, there is a problem that dirt, particularly fingerprints, are easily noticeable, and the aesthetic appearance peculiar to piano black is easily impaired. However, if the surface of the molded product is made to be a textured surface in order to solve such problems, the glossiness peculiar to piano black is completely lost.

  Therefore, the present invention has been made in view of such a situation, and the problem is that an additional process after molding the appearance of a product in which dirt such as fingerprints is hardly noticeable without losing the aesthetics of the product obtained by the glossy surface as much as possible. It is to obtain at low cost without going through.

  In order to solve the above problems, the resin molded product according to the first aspect of the present invention has a concavo-convex pattern formed on the surface by resin molding, and the concavo-convex pattern includes a glossy surface and the glossy surface. The non-glossy surface further protrudes and is evenly scattered on the glossy surface at a predetermined ratio per unit area.

  According to this aspect, the uneven pattern is formed on the surface of the resin molded product, and the uneven pattern protrudes from the glossy surface and the glossy surface, and is uniformly spotted on the glossy surface at a predetermined ratio per unit area. Since the non-glossy surface is formed, it is possible to make the dirt such as fingerprints effectively inconspicuous due to the non-glossy surface scattered while the glossy surface provides a glossy surface. That is, the non-glossy surface is arranged so as to be evenly scattered at a predetermined ratio per unit area on the glossy surface so as not to impair the glossiness obtained by the glossy surface as much as possible. Note that “evenly” means that the non-glossy surface does not exist in a certain area in the unit area, but is arranged without any deviation over the entire area.

And since the said non-glossy surface protrudes rather than the said glossy surface, dirt, such as a fingerprint, does not adhere easily to the said glossy surface. And since such a concavo-convex pattern is formed by resin molding, it is possible to reduce the cost of a resin molded product that does not go through additional steps after molding, while obtaining a glossy appearance on the surface of the molded product and preventing stains such as fingerprints from being noticeable. Can get to.
The resin molded product according to the second aspect of the present invention has a concavo-convex pattern formed on the surface by resin molding, and the concavo-convex pattern is positioned to be recessed from the non-glossy surface and the non-glossy surface, The non-glossy surface is formed by glossy surfaces that are evenly scattered at a predetermined ratio per unit area. According to this aspect, as in the first aspect, while obtaining a glossy surface by the glossy surface, dirt such as fingerprints is effectively made inconspicuous by the non-glossy surface protruding from the glossy surface. Can do.

  The resin molded product according to the third aspect of the present invention is characterized in that in the resin molded product according to the first or second aspect, the non-glossy surface is a textured surface. According to this aspect, since the non-glossy surface is a textured surface, fingerprints and the like attached to the non-glossy surface can be made more inconspicuous.

  The resin molded product according to the fourth aspect of the present invention is the resin molded product according to any one of the first to third aspects, wherein the ratio of the non-glossy surface per unit area is 20% or more and 80% or less. It is characterized by being.

  The present inventor has found by visual evaluation that when the ratio of the non-glossy surface per unit area is less than 20%, fingerprints attached to the glossy surface are easily noticeable. If it exceeds 80%, the glossiness is too low and the glossiness is significantly impaired. Especially when piano black is adopted as the appearance color, the entire surface becomes whitish and cloudy, and the jet blackness peculiar to piano black. Was found to decrease significantly. Therefore, as described above, the ratio of the non-glossy surface per unit area is set to 20% or more and 80% or less, so that it is possible to obtain a product appearance in which dirt such as fingerprints is not noticeable while obtaining glossiness.

  The resin molded product according to the fifth aspect of the present invention is the resin molded product according to any one of the first to fourth aspects, wherein the protrusion height of the non-glossy surface from the glossy surface is 5 μm or more and 40 μm or less. It is characterized by being.

  When the protrusion height of the non-glossy surface is less than 5 μm by visual evaluation, the inventor has almost no irregularities on the surface of the molded article, and the effect of preventing the visibility of dirt such as fingerprints from the non-glossy surface cannot be obtained. When it exceeds 40 μm, it has been found that the side surface area of the convex shape increases, the glossiness is too low, and the glossiness is significantly impaired. Therefore, as described above, by setting the projection height of the non-glossy surface from the glossy surface to 5 μm or more and 40 μm or less, it is possible to obtain a product appearance in which dirt such as fingerprints is hardly noticeable while obtaining a glossy feeling.

  A resin molded product according to a sixth aspect of the present invention is the resin molded product according to any one of the first to fifth aspects, wherein the resin molded product has a closed posture that covers the document table of the scanner device and an opening that opens the document table. The document cover is provided on the main body of the scanner device so that the posture can be changed between the posture and the posture. According to this aspect, in the scanner device, the same operational effects as those of any of the first to fifth aspects can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of a recording apparatus provided with a document cover 6 as a “resin molded product” according to the present invention, more specifically, an inkjet multifunction peripheral (hereinafter referred to as “printer”) 1. FIG. FIG. 2B is a partially enlarged plan view of the surface of the document cover 6, and FIGS. 3A to 3E are diagrams schematically showing a mold etching process.

  As shown in FIG. 1, the printer 1 includes a recording unit 2 having an inkjet printer function at the lower part of the apparatus and a scanner device 3 having a scanning function at the upper part of the apparatus, that is, is configured as a scanner-integrated printer. . An operation unit 4 having operation input elements such as a power button, a print setting button, and a print execution button is arranged on the upper part of the apparatus. An image read by the scanner device 3 by the printer 1 alone is covered by the recording unit 2. Recording can be performed on a recording sheet as an example of a recording material.

  The scanner device 3 is provided with a document cover 6 in a rotatable manner in the apparatus body, and the document cover 6 is rotated to open the document table (not shown) and to close the document table (FIG. 1). ) And the posture changes.

  As shown in FIGS. 2A and 2B, an uneven pattern 7 is formed on the surface 6a of the original cover 6 by resin molding as shown in FIGS. The concavo-convex pattern 7 includes a glossy surface 8 and a non-glossy surface 9 that forms the top surface of the convex portion 10 protruding from the glossy surface 8 and is evenly scattered on the glossy surface 8 at a predetermined ratio per unit area. Is formed. 2A exaggerates the length in the vertical direction (projection direction of the convex portion 10) for the sake of convenience.

  The non-glossy surface (matte surface) 9 has a gloss level lower than that of the glossy surface 8 and has a gloss level such that the surface is hardly glossy and cannot be recognized as a glossy surface. (So-called textured surface) or the like can be used. The glossiness can be measured by a JIS Z 8741 glossiness measurement method. For example, if a measurement sample having a glossy surface 8 formed on the entire surface 6a is used, the 60 ° specular glossiness of the glossy surface 8 is measured. If a measurement sample in which the non-glossy surface 9 is formed over the entire surface 6a is used, the 60 ° specular gloss of the non-glossy surface 9 can be measured.

  In the example shown in FIG. 2B, the non-glossy surface 9 has a circular shape in a plan view and forms a dimple-like pattern as a whole. A geometric shape, a character shape, or the like may be used, or a checkered pattern or a mesh pattern may be used. In other words, the non-glossy surface 9 does not exist in a certain area in the unit area, and is disposed evenly over the entire area, whereby the glossy surface when viewed in cross section as shown in FIG. 8 and the non-glossy surface 9 may be arranged alternately.

  Thus, the metal mold | die for forming the uneven | corrugated pattern 7 on the molded article surface can be created with the method as shown, for example in FIG. As shown in FIG. 3A, a photocurable resist film 14 is attached to the surface of the mold 13, and a pattern forming film 15 is adhered thereto. The pattern-forming film 15 has a pattern in which a portion corresponding to the glossy surface 8 is transparent and only a portion corresponding to the non-glossy surface 9 is blocked from ultraviolet light.

  Next, as shown in FIG. 3B, when the ultraviolet light is irradiated from above the pattern forming film 15 as indicated by an arrow, the photocurable resist film 14 is cured by the light passing through the pattern forming film 15, Adhere to the mold 13. Next, when the pattern forming film 15 and the photocurable resist film 14 are peeled off, only the cured portion 14a of the photocurable resist film 14 remains as shown in FIG.

  Next, when the etching solution is brought into contact with the mold 13, the portion other than the cured portion 14 a of the photocurable resist film 14 is etched as shown in FIG. 3D, and the concave surface 17 whose surface is minute unevenness is etched. The remaining convex portion 16 is formed. Thereafter, when the cured portion 14a of the photo-curable resist film 14 is removed, a state in which the concave surface 17 having the fine irregularities formed on the surface and the convex surface 18 having the smooth surface is formed as shown in FIG. It becomes.

  By performing injection molding using the mold 13 thus formed, it is possible to obtain the document cover 6 in which the uneven pattern 7 described with reference to FIG. 2 is decorated on the surface of the molded product. As the molding resin, for example, ABS resin or HIPS (high impact polystyrene) can be used. In particular, when HIPS is used, the document cover 6 can be produced at a lower cost.

  Since the uneven pattern 7 is formed by the glossy surface 8 and the non-glossy surface 9 that protrudes from the glossy surface 8 and is evenly scattered at a predetermined ratio per unit area on the glossy surface 8 as described above. While the glossy surface 8 provides a glossy surface on the product surface, the scattered non-glossy surface 9 can effectively make dirt such as fingerprints less noticeable.

  In other words, the non-glossy surface 9 is arranged so as to be evenly scattered at a predetermined ratio per unit area on the glossy surface 8 so as not to impair the glossiness obtained by the glossy surface 8 as much as possible. Moreover, since the non-glossy surface 9 protrudes more than the glossy surface 8, dirt such as fingerprints is difficult to adhere. Such a concavo-convex pattern 7 is formed by resin molding (for example, injection molding), so that the appearance of the product with less glossy fingerprints and the like is obtained with low gloss without going through an additional process after molding. Can get to.

  Next, visual evaluation was performed by changing the ratio of the non-glossy surface 8 per unit area using a black resin. When the ratio of the non-glossy surface 8 per unit area exceeded 80%, the glossiness decreased. However, although the black resin was adopted, the whole became whitish and cloudy, and the jet black feeling peculiar to piano black was hardly obtained. On the other hand, when the ratio is less than 20%, fingerprints attached to the surface are easily noticeable. Therefore, the ratio of the non-glossy surface 8 per unit area is preferably 20% or more and 80% or less.

In addition, it has been found that when the distance between adjacent non-glossy surfaces 9 (pitch: indicated by symbol h in FIG. 2B) is 1 mm or less, dirt such as fingerprints is effectively inconspicuous.
In addition, when the protrusion height of the non-glossy surface 9 from the glossy surface 8 is less than 5 μm, the surface of the molded product is almost free of irregularities, and the effect of preventing the visibility of dirt such as fingerprints by the non-glossy surface 9 cannot be obtained. On the other hand, when it exceeds 40 μm, the side surface area of the convex portion 10 is increased, the glossiness is excessively lowered, and the glossiness is remarkably impaired. Therefore, it is desirable that the protrusion height of the non-glossy surface 9 from the glossy surface 8 (indicated by the symbol d in FIG. 2A) is 5 μm or more and 40 μm or less.

  The glossiness of the glossy surface 8, the glossiness of the non-glossy surface 9, the difference between the glossiness of the glossy surface 8 and the glossiness of the non-glossy surface 9, etc., depends on the resin material used, resin color, molding conditions, etc. This is a matter that can be determined by evaluating the glossiness of the surface of the molded article and the difficulty of conspicuous dirt (particularly fingerprints) after appropriate selection. The glossiness of the non-glossy surface 9 is lower than the glossiness of the glossy surface 8. Insofar as any value is possible.

<< Other Examples >>
Next, another embodiment will be described with reference to FIG. The concave / convex pattern 7 ′ shown in FIGS. 4 (A) and 4 (B) is formed by resin molding in the same manner as the concave / convex pattern 7 described with reference to FIG. The non-glossy surface 9 is formed by the glossy surface 8 that forms the bottom surfaces of the recesses 11 that are evenly scattered at a predetermined rate per unit area. 4A exaggerates the length in the vertical direction (depth of the recess 11) for convenience.

  The non-glossy surface (matte surface) 9 has a gloss level lower than that of the glossy surface 8 and has a gloss level that is almost glossless and cannot be recognized as a glossy surface. (So-called textured surface) or the like can be used. In this embodiment, the glossy surfaces 8 that are evenly scattered on the non-glossy surface 9 have a circular shape in plan view, and form a dimple-like pattern as a whole.

  Also in this embodiment, the concave / convex pattern 7 ′ is formed by the non-glossy surface 9 and the glossy surface 8 located in a recess from the non-glossy surface 9 as described above. In addition, the non-glossy surface 9 can effectively make dirt such as fingerprints inconspicuous.

1 is a perspective view of a printer provided with a document cover according to the present invention. (A) is a sectional view of the document cover, (B) is a partially enlarged plan view of the surface of the document cover. (A)-(E) are the figures which showed the etching process of the metal mold | die typically. (A) is a sectional view of a document cover according to another embodiment, (B) is a partially enlarged plan view of the surface of the document cover.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inkjet printer, 2 recording part, 3 scanner apparatus, 4 operation part, 5 manuscript stand, 6 manuscript cover, 7 uneven pattern, 8 glossy surface, 9 non-glossy surface, 10 convex part, 11 concave part, 13 mold, 14 light Curable resist film, 15 pattern forming film, 16 convex portion, 17 concave surface, 18 convex surface

Claims (6)

It has a concavo-convex pattern formed by resin molding on the surface,
A resin molded product, wherein the uneven pattern is formed by a glossy surface and a non-glossy surface that protrudes from the glossy surface and is evenly scattered on the glossy surface at a predetermined ratio per unit area. It has a concavo-convex pattern formed by resin molding on the surface,
The concavo-convex pattern is formed by a non-glossy surface and a glossy surface that is recessed from the non-glossy surface and is evenly scattered at a predetermined ratio per unit area on the non-glossy surface. Resin molded product.   The resin molded product according to claim 1 or 2, wherein the non-glossy surface is a textured surface.   4. The resin molded product according to claim 1, wherein a ratio of the non-glossy surface per unit area is 20% or more and 80% or less. 5.   5. The resin molded product according to claim 1, wherein a protrusion height of the non-glossy surface from the glossy surface is 5 μm or more and 40 μm or less. 6.   6. The scanner device according to claim 1, wherein the resin molded product is capable of changing its posture between a closed posture that covers the document table of the scanner device and an open posture that opens the document table. 7. A resin molded product characterized by being a document cover provided on the main body.

Images