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Resin molded article, method for manufacturing the same, and printer

a resin molded article and printer technology, applied in the field of plate-shaped or box-shaped resin molded articles, can solve the problems of non-uniform section formation due to disturbance of resin flow, inability to satisfactorily suppress resin flow, and inability to sufficiently disturb resin flow,

Inactive Publication Date: 2012-06-21
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The present invention provides a molded article which includes a projecting or recessed portion on a non-exterior surface or a projecting or recessed portion on an ext

Problems solved by technology

However, the formation of the non-uniform section due to disturbance of the resin flow cannot be satisfactorily suppressed.
Accordingly, disturbance of the resin flow occurs only in the thickness direction of the resin molded article, and the resin flow cannot be sufficiently disturbed.
As a result, a non-uniform section appears on the surface of the molded article.
However, when the mold temperature is increased, a long cooling time is required.
Therefore, the molding cycle time increases and the productivity decreases.

Method used

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  • Resin molded article, method for manufacturing the same, and printer
  • Resin molded article, method for manufacturing the same, and printer
  • Resin molded article, method for manufacturing the same, and printer

Examples

Experimental program
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examples

[0067]Examples of the present invention and comparative examples will now be described. As examples of the present invention, the present invention was applied to a document cover, which was a part of a housing of a multifunction printer including a document reading device. FIG. 13 is a perspective view of the multifunction printer including the document reading device to which the present invention was applied. In FIG. 13, a multifunction printer 19 includes a housing 20 that forms a document cover 23 and a main body of the multifunction printer 19. The housing 20 was made of black resin, and the surface thereof was a mirror face. FIG. 14 is a perspective view illustrating the state in which the document cover 23 is opened. In the examples, the present invention was applied to a non-exterior surface 22 of the document cover 23 illustrated in FIG. 14.

First Example

[0068]In the first example, the repeated pattern of projections and / or recesses was formed on the non-exterior surface 22...

tenth example

[0089]A document cover was formed under the same conditions as the conditions of the first example except a recessed portion 403 (see FIG. 16E) was formed on the non-exterior surface 22 by the ejector pin and the cavity instead of the rib 2 (see FIG. 16A) formed in the first example.

eleventh example

[0090]A document cover was formed under the same conditions as the conditions of the first example except an arrow 404 (see FIG. 16F) having a projecting shape that indicates a product function was formed as a projecting portion on the exterior surface 21 in place of the rib 2 (see FIG. 16A) formed on the non-exterior surface 22 in the first example.

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Abstract

A molded article has an exterior surface, a non-exterior surface, and a projecting or recessed portion provided on at least one of the exterior surface and the non-exterior surface. A repeated pattern of projections and / or recesses or a texture face, which serves to disturb the flow of resin, is provided on the non-exterior surface.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to plate-shaped or box-shaped resin molded articles. More specifically, the present invention relates to a plate-shaped or box-shaped resin molded article which is formed by injection molding and required to have a good appearance.[0003]2. Description of the Related Art[0004]An example of a plate-shaped or box-shaped resin molded article includes various projecting or recessed portions. For example, a projecting or recessed portion such as a rib-shaped projecting portion for reinforcing or positioning the resin molded article or a stepped portion formed by an ejector pin may be formed on a non-exterior surface of the resin molded article. In addition, a projecting or recessed portion such as an arrow-shaped portion for introducing a product function to the user may be formed on an exterior surface of the molded article.[0005]Here, the exterior surface is a surface that is visible to the use...

Claims

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Application Information

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IPC IPC(8): B32B3/00B29C33/42
CPCB29C45/0025Y10T428/24355B29L2031/767B29C45/372B29C45/2624B32B3/30B41J29/02Y10T428/24479
Inventor MORIYA, YUTANISHI, AKIRAKODAIRA, KOKI
Owner CANON KK