Static molds – Including static filling means in contact with mold cavity
Patent
1979-06-20
1981-02-24
Flint, Jr., J. Howard
Static molds
Including static filling means in contact with mold cavity
425572, 425542, 425808, B29F 1022, B29C 100, B29D 1100
Patent
active
042522943
ABSTRACT:
PCT No. PCT/JP78/00011 Sec. 371 Date June 25, 1979 Sec. 102(e) Date June 20, 1979 PCT Filed Oct. 25, 1978, PCT Pub. No. WO 79/00235 PCT Pub. Date May 3, 1979.
A Mold for injection molding suitable for the production of those molded synthetic resin articles such as lenses and prisms which are required to be homogeneous and isotropic, in which first and second gates (3, 4) are provided between runner (2) and cavity (1), said first gate (3) having a cross-sectional area smaller than that of runner (2) and connecting to second gate (4); said second gate (4) extending from first gate (3) with the width progressively increasing in a form simulating the shoulder part of a coathanger to meet cavity (1) and having constriction (5) provided halfway to the cavity.
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Shiraishi Jimichiro, "Shashutsuseikeijou Kavagata", pp. 105 & 99, (1976-12-10), (applicant).
Japan Plastics, vol. 14, No. 2, (1963-2), p. 24, (applicant).
Asahi Kase Kogyo Kabushikia Kaisha
Flint, Jr. J. Howard
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