Title:
PREFORM EXTRUSION MOLDING APPARATUS, METHOD FOR EXTRUSION MOLDING, AND PREFORM
Document Type and Number:
WIPO Patent Application WO/2013/073405
Kind Code:
A1
Abstract:
The present invention addresses the problem of controlling with high productivity and high precision the lamination state of an intermediate layer in the bottom portion of a preform during injection molding of the preform, the preform having a second resin layer laminated into a main material layer. The primary means of the present invention for addressing this problem is a method for injection-molding a test-tube-shaped preform with a second resin layer laminated into a main material layer as an intermediate layer, wherein a main-material resin is supplied for a designated amount of time at a designated supply speed from an outer flow channel and an inner flow channel to a combined flow channel; a second resin is supplied at the same time at a designated supply speed from a middle flow channel to the combined flow channel at a set time within the designated time range when the main-material resin is supplied; a shut-off pin is slid before the second resin is supplied, or after a designated time has elapsed from the start of the supply at least until the supply of the second resin is completed; the tip is placed in a designated location near the open end of the inner flow channel toward the combined flow channel; the opening of the open end is adjusted; and the supply speed of the main-material resin from the inner flow channel to the combined flow channel is reduced to a designated supply speed.
Inventors:
CHIBA JUNICHI
SHIMIZU KAZUHIKO
HOSOKOSHIYAMA HIROSHI
SHIMIZU KAZUHIKO
HOSOKOSHIYAMA HIROSHI
Application Number:
PCT/JP2012/078662
Publication Date:
May 23, 2013
Filing Date:
November 06, 2012
Export Citation:
Assignee:
YOSHINO KOGYOSHO CO LTD (JP)
CHIBA JUNICHI
SHIMIZU KAZUHIKO
HOSOKOSHIYAMA HIROSHI
CHIBA JUNICHI
SHIMIZU KAZUHIKO
HOSOKOSHIYAMA HIROSHI
International Classes:
B29C45/16; B29B11/08; B29C45/76; B29C49/06; B29C49/22
Foreign References:
| JPS6399918A | 1988-05-02 | |||
| JPH0449010A | 1992-02-18 | |||
| JP2002538994A | 2002-11-19 | |||
| JPH05253973A | 1993-10-05 | |||
| JP2005343099A | 2005-12-15 | |||
| JPH06122134A | 1994-05-06 | |||
| JP2004330672A | 2004-11-25 |
Other References:
See also references of EP 2781330A4
Attorney, Agent or Firm:
WATANABE KAZUTOYO (JP)
Kazutoyo Watanabe (JP)
Kazutoyo Watanabe (JP)
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Claims:
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