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Title:
INJECTION-MOLDED ARTICLE
Document Type and Number:
Japanese Patent JPH071495
Kind Code:
A
Abstract:

PURPOSE: To obtain a resin-molded article good in shape and quality without causing any strain that may curve side walls of the molded article by providing thin-wall recesses in the peripheral edge portion of a bottom wall of the same in a vessel-shaped injection-molded article which is formed of a bottom wall and side walls and whose upper face is open.

CONSTITUTION: A case 11 made of resin, which is injection-molded into a vessel shape, consists of a rectangular bottom wall 12 and respective side walls 13 to 16 provided at four sides of the bottom wall 12 and standing in an orthogonal direction from respective side edges thereof, and they are formed into one body. Recesses 17 provided inside the bottom wall 12 to make the thickness (a) thereof thinner are formed discontinuously at predetermined intervals along the side edges of the bottom wall. By forming the thin-wall recesses 17, which accelerate cooling speed, at joint portions between the bottom wall 12 and each of the side walls 13 to 16, where cooling is slowest, shrinkage of the side wall 13 to 16 by cooling occurs almost simultaneously from the upper side edge portions and from the lower side edge portions at the time of air cooling of the case 11 after mold release. By this method, the resin-molded article good in shape and quality can be obtained without causing any strain to the respective side walls 13 to 16.


Inventors:
SAKAI TAKAKAZU
Application Number:
JP14443993A
Publication Date:
January 06, 1995
Filing Date:
June 16, 1993
Export Citation:
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Assignee:
KANSEI KK
International Classes:
B29C45/26; B29D22/00; B29C45/00; B29L22/00; (IPC1-7): B29C45/00; B29C45/26; B29D22/00
Attorney, Agent or Firm:
Honda Kodaira (3 outside)