Title:
RESIN MOLDING AND ITS MOLD
Document Type and Number:
Japanese Patent JPS54153866
Kind Code:
A
Abstract:
PURPOSE: To cast a resin into corness of difficult casting with certainty and to prevent defective products, e.g. insufficient filling, by casting the resin into the cavity while sucking the air through the suction holes of a mold.
CONSTITUTION: The resin 8 is cast into the cavity 3 while sucking the air from the cavity 3 which sucking the air from the cavity 3 between the top and the bottom forces 2 and 1 through the suction holes 7 at the corners 6a to 6e by the vacuum pump 9. The resin 8 is cast into the corners 6a to 6e of difficult casting with certainty because of the suction through the holes 7. Thus, the high-speed casting is possible without causing insufficient filling or pinholes.
Inventors:
YOSHIZAWA TOSHINORI
INOMATA FUJIHIKO
KUROSAWA HIROSHI
INOMATA FUJIHIKO
KUROSAWA HIROSHI
Application Number:
JP6107478A
Publication Date:
December 04, 1979
Filing Date:
May 24, 1978
Export Citation:
Assignee:
HITACHI LTD
International Classes:
B29C33/00; B29B7/00; B29C39/00; B29C39/10; B29C39/42; H01L21/56; H01L21/70; H05K3/00; (IPC1-7): B29C6/00; H01L21/70; H05K3/00
Domestic Patent References:
| JPS4967824A | 1974-07-01 | |||
| JPS5117983A | 1976-02-13 | |||
| JPS5080375A | 1975-06-30 |