US 5,846,466 AGranted

Method for forming a laminate structural molding

AssigneeIdemitsu Petrochemical Co., Ltd.

InventorsTomokazu Abe, Satoshi Matsumoto, Toshifumi Shimazaki

Life of this patent

Estimating the term…

Loading patent…

Abstract

A die for injection molding for charging molten resin onto a surface material set on the cavity surface is disclosed. The die comprises direction changing means for changing the direction of flow of the molten resin charged through the gate to directions along the surface of the surface material. The direction changing means may be a substantially conical direction changing member for changing the direction of flow of the molten resin. Since the direction changing means can change the direction of flow of the molten resin charged into the die, which is completely closed or slightly open, to directions along the surface of the surface material, the molten resin does not strike the surface material. Thus, damage to the surface material in the neighborhood of the gate can be prevented, and the surface material can be protected against the collision with molten resin which is at a high temperature and under a high pressure.

Claims12

Dependent claims

A method of forming a laminate structural molding including the steps of:

positioning a layer of surface material in a die cavity, said die cavity being formed by a pair of die halves having opposed, spaced apart, faces, wherein said positioning step includes placing said surface material against said exposed face of a first said die half so that said surface material has an exposed surface located adjacent said exposed face of a second said die half;
positioning said die halves apart from each other a predetermined distance so that said second die half exposed face and said surface material are spaced apart a predetermined first distance;
injecting a resin into said die cavity and onto said exposed surface of said surface material through a supply bore formed in said second die half, wherein said resin is deposited on said surface material through an opening formed in said exposed face of said second die half and wherein said injection of said resin into said cavity is controlled by a valve secured to said second die half, said valve having a valve head which is cooled, said valve head having a first position in which said valve head is located in said opening formed in said exposed face of said second die half so as to close said opening and a second position located in said cavity formed by said die halves so as to open said opening and said valve head is formed with an outwardly extending surface so that during said resin injection step, said valve head directs said resin flow laterally away from said opening and from said exposed surface of said surface material located adjacent said opening;
and
compressing said first and second die halves together so that said surface material exposed surface and said second die half exposed face are spaced apart a second distance less than said first distance.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/668,564Filed 19 Jun 1996 · division
Priority: JP 5-13844110 Jun 1993
Granted: 8 Dec 1998
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B29C 45/28
Sprue channels ; Runner channels or runner nozzles: closure devices therefor
B29C 45/14836
Incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles: preventing damage of inserts during…
B29C 45/2806
Closure devices therefor: consisting of needle valve systems
B29C 45/561
Using mould parts movable during or after injection, e.g. injection-compression moulding: injection-compression moulding