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Patent Searching and Data


Title:
METAL DIE FOR INJECTION MOULDING
Document Type and Number:
WIPO Patent Application WO/1979/000235
Kind Code:
A1
Abstract:
A metal die for injection moulding suitable for making synthetic resin cast articles which need to have an isotropic structure, such as lenses and prisms, has a first and a second gate (3, 4) located between a runner (2) and a cavity (1). The first gate (3), the middle part of which is a narrow passage (5), is connected to the second gate (4) through a passage having a cross section smaller than that of the runner (2), and the second gate (4) is connected through a gradually extending passage to cavity (1) having the shape of the shoulder portion of a coat-hanger.

Inventors:
UCHIO S (JP)
Application Number:
PCT/JP1978/000011
Publication Date:
May 03, 1979
Filing Date:
October 25, 1978
Export Citation:
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Assignee:
ASAHI CHEMICAL IND (JP)
UCHIO S (JP)
International Classes:
B29B13/00; B29C33/00; B29C45/00; B29C41/00; B29C45/26; B29C45/27; B29C45/30; B29C45/37; B29C45/77; B29C61/00; B29D11/00; (IPC1-7): B29F1/022; B29D11/00
Foreign References:
JPS3210870Y1
JPS464070B1
Other References:
Shiraishi Junichiro "Shashutsuseikeiyou Kanagata" (1976-12-10) Nikkan Kyogo page 105
Plastics, Vol.14, NO.2, (1963-2) J.D. Bruton (Okano Ryoichi translation) "Derurin Asetaru Jushi no Shashutsuseikeiyou Konagata no Gate Sekkei" page 24
Ogawa Kiyoichi "Plastics Kanagata Binran" (1965-9-25) Seibundou Shinkohsha page 239
Shiraishi Junichiro "Shashutsuseikeiyou Kanagata" (1976-12-10) Nikkan Kogyo, page 99
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