|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||264/94 ; 264/296 ; 425/525 ; 425/526|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 69 인용 특허 : 0|
A method of making a concave bottom on a blown thermoplastic container. A blowable pre-form is initially expanded against a composite mold surface defined by the end faces of a plurality of concentric tubes surrounding a central actuating rod. The rod and the tubes are initially telescopically positioned to define a composite concave surface, so that a first convex bottom is blown. Subsequently, the rod and tubes are actuated telescopically to progressively invert the convex bottom to a concave shape. The end faces of the tubes may be grooved to define r...
In a method of blow molding a plastic container having one concave wall from a thermoplastic material, by the inflation of a thermoplastic parison interiorly of a blow mold into a blown pre-form having the overall configuration and size of the final container with the exception of the configuration of said one wall, the one wall of the pre-form being generally convex and protruding from the remainder of the pre-form, and said one wall being at a formable temperature, the steps of, in the blow mold and while the pre-form remains inflated, (1) contacting t...