|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||264/040.3 ; 264/040.1 ; 264/572|
|발명자 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 15 인용 특허 : 30|
A method is provided for gas-assisted injection molding for forming a hollow product. The mold cavity is prepressurized with fluid prior to injecting the molten material into the mold cavity, and the molten material is injected into the mold cavity against the pressurized fluid to establish a resultant internal counterpressure within the molten material. A pressurized assist-gas is injected into the molten material to form a gas bubble within the molten material. The injection of molten material into the cavity is then controlled in a manner to maintain ...
[ What is claimed is:] [1.] A method of gas-assisted injection molding of molten material into a mold cavity to form a hollow product, wherein the molten material experiences up to a predetermined maximum shrinkage stress when the molten material is constrained within the mold cavity, the method comprising:supplying pressurized fluid to the mold cavity prior to injecting the molten material into the mold cavity;injecting the molten material into the mold cavity against the pressurized fluid to establish a resultant internal melt pressure within the molte...