The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 06, 2004
Filed:
Feb. 21, 2001
Tomoyuki Obara, Ichihara, JP;
Katsuhiko Tada, Ichihara, JP;
Sueki Sugawara, Ichihara, JP;
Shoichi Miura, Kariya, JP;
Hirofumi Yamada, Kariya, JP;
Shigekazu Kumazaki, Kariya, JP;
Other;
Abstract
Blow-molding molds and having parison shutters and for preventing an inflation of the parison toward the outside of the molds and are used in a blow-molding method of the present invention. In other words, a closed space for preventing the parison from inflating out of the molds and are formed by the parison shutters and and a predetermined air is secured in the parison in a frame clamping step (B). In the subsequent mold clamping step (C), the pressure inside the parison starts to be increased when the molds and press the parison , so that the parison can be continuously in contact with the die design surface . Accordingly, since the parison can be uniformly contracted by cooling, molding failure such as streaks and uneven pattern transfer can be avoided, thus obtaining a blow-molded product having good appearance.