INJECTION DEVICE AND SCREW - SUMITOMO HEAVY INDUSTRIES

Title:

INJECTION DEVICE AND SCREW

Document Type and Number:

WIPO Patent Application WO/2016/152858

Kind Code:

A1

Abstract:

[Problem] To provide an injection device that suppresses screw whirling and reduces friction between a screw and a cylinder. [Solution] An injection device having a cylinder for heating a mold material and a screw that is rotatably provided inside the cylinder, wherein: the screw has a rotating shaft, a helical flight projecting from the outer circumference of the rotating shaft, and a helical dividing flight dividing the groove formed by the flight, and conveys the mold material from the upstream side to the downstream side along the rotating shaft as a result of rotation of the rotating shaft; the flight has a variable-diameter flight section in which the crest height in a downstream-side end section is lower than the crest height in an upstream-side end section; and the upstream end of the dividing flight is positioned on the upstream side of the downstream end of the variable-diameter flight section.

Inventors:

FUKUMURA HIDEO (JP)
ISHIDA HIRONOBU (JP)

Application Number:

PCT/JP2016/058995

Publication Date:

September 29, 2016

Filing Date:

March 22, 2016

Export Citation:

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Assignee:

SUMITOMO HEAVY INDUSTRIES (JP)

International Classes:

B29C45/60; B29B7/42; B29C45/47; B29C45/54; B29C48/595

Foreign References:

JPH07100873A	1995-04-18
JP2013035234A	2013-02-21
JPH0285119U	1990-07-03
JPS6190509U	1986-06-12
JPS5919133A	1984-01-31
JP2005096119A	2005-04-14

Other References: