|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||264/572 ; 264/161 ; 264/3287 ; 264/3288|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 35 인용 특허 : 6|
A method and apparatus for injection molding plastic articles with gas-assistance wherein the injected molten plastic is depressurized by a controlled amount prior to gas injection to facilitate the penetration of the gas into the molten plastic within the article-defining cavity of the mold.
In an apparatus for injection molding, a method of injection molding a plastic article with gas-assistance, the method comprising the steps of: injecting a pressurized charge of molten plastic through a flow path having a volume at least partially defined by a movable part of the apparatus and into an article-defining cavity of a mold; then depressurizing the molten plastic in the flow path by a controlled amount after the injection step by moving the movable part; then introducing a charge of gas pressurized at a predetermined level into the molten plas...