|국가/구분||United States(US) Patent 등록|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 8 인용 특허 : 33|
A system and process for gas assisted plastic injection molding, particularly of hollow tubular components. The plastic material is injected into the mold cavity through an apex of a cone-shaped inlet configuration. After the molding pressure is held for a period of time, gas is injected into the plastic material and pressure is again held for a period of time, a valve member is opened allowing plastic to be expelled into a secondary cavity. The flow of the plastic and gas are controlled in an axial direction in order to prevent turbulence. The gas flow ...
1. A process for injection molding a hollow plastic tubular article comprising the steps of:(a) injecting a quantity of plastic material into a mold cavity to at least substantially fill said mold cavity, the mold cavity having a substantially cone-shaped inlet portion, wall surfaces forming an elongated central portion, and an exit portion, said cone-shaved inlet portion having an apex; (b) injecting pressurized gas into the plastic material in the mold cavity said gas being injected at said apex; (c) holding the pressure of the gas and plastic in the m...