Gateless molding
OwnerDale Groveinventor
Life of this patent
Estimating the term…
Abstract
Method and apparatus for forming an article from a molten plasticized resin using an injection molding machine by (a) forming a mold cavity having a first region for producing a molded part and a second, distinctive region for receiving a plasticised resin; (b) injecting into the second region a volume of plasticized resin for the article to be formed in the first region of the mold cavity; (c) applying pressure to plasticized resin to move it at least in part from the second region to the first region; and (d) maintaining pressure on the plasticised resin in the first region until the article is formed and stresses are relieved.
Claims15
A method of forming a gateless article from a material using a molding machine, comprising the steps of:
- (a) forming a mold cavity having a first region for producing a molded part and a second, distinctive region including a gate for receiving said material;
- (b) injecting into said second region through a plurality of gates a volume of said material for the article to be formed in said first region of said mold cavity;
- (c) applying pressure to said material to move it beyond said gate from said second region into said first region;
- whereby said article does not have any gating marks;
- and
- wherein the volume of said second region is controlled by a movable insert of said machine.
A method of forming a gateless article from a material using a molding machine, comprising the steps of:
- (a) forming a mold cavity having a first region for producing a molded part and a second, distinctive region including a gate for receiving said material;
- (b) injecting into said second region through said gate a volume of said material for the article to be formed in said first region of said mold cavity;
- (c) applying pressure to said material to move it beyond said gate from said second region into said first region;
- whereby said article does not have any gating marks;
- and
- wherein the volume of said second region is controlled by a movable insert of said machine and the injection of said material is through a sidewall of said mold cavity with an edge-gate for a hot runner.
Apparatus for forming a gateless article form a moldable material, comprising;
- (a) means for forming a mold cavity having a first region for producing a molded part and a second distinctive region for receiving said moldable material through a gate;
- and
- (b) means for injecting through said gate into said second region of a volume of material to be molded in said first region;
- wherein said cavity is formed by a first member in contact with a first platen and a second member mounted on a movable platen, said second member surrounds an insert mounted on said movable platen and said second member is spring loaded.
The method of forming a gateless article from a material using a molding machine having first and second mold platens, comprising:
- (a) forming a mold cavity having a first region adjoining a second region containing a gate for the injection of said material into said second region;
- (b) injecting into said second region a volume of material through said gate;
- and
- (c) forcing said material from said second region into said first region beyond said gate;
- whereby said material forced into said first region does not have any gating marks;
- wherein the injection of said material is through an edge-gate for a hot runner and is through a sidewall of said mold cavity.
Dependencies are inferred from the claim text.