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1. (WO1979000235) METAL DIE FOR INJECTION MOULDING
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000235 International Application No.: PCT/JP1978/000011
Publication Date: 03.05.1979 International Filing Date: 25.10.1978
IPC:
B29C 45/27 (2006.01) ,B29D 11/00 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
C
SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; AFTER- TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
45
Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
17
Component parts, details or accessories; Auxiliary operations
26
Moulds
27
Sprue channels
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
D
PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
11
Producing optical elements, e.g. lenses or prisms
Applicants:
Inventors:
Priority Data:
77/12721525.10.1977JP
Title (EN) METAL DIE FOR INJECTION MOULDING
(FR) MATRICE METALLIQUE POUR LE MOULAGE PAR INJECTION
Abstract:
(EN) 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.
(FR) Une matrice metallique pour le moulage par injection convenant a la fabrication d"articles moules en resine synthetique qui doivent presenter une structure isotrope, telle que des lentilles et des prismes, comprend un premier orifice et un second orifice (3, 4) situes entre une tubulure d"admission (2) et une cavite (1). Le premier orifice (3), dont la partie mediane consiste en un passage etroit (5), communique avec le second orifice (4) par l"intermediaire d"un passage qui presente une section plus petite que celle de la tubulure d"admission (2), et le second orifice (4) communique, par l"intermediaire d"un passage qui s"elargit progressivement, avec la cavite (1) qui a la forme de la partie formant epaule d"un cintre.
Designated States:
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)