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:
Jun. 17, 2008
Filed:
Aug. 29, 2003
Takahiro Miyata, Okayama, JP;
Katsunori Hatashi, Niigata, JP;
Tatsuya Sunamoto, Kurashiki, JP;
Tadao Yoshikawa, Kurashiki, JP;
Takahiro Miyata, Okayama, JP;
Katsunori Hatashi, Niigata, JP;
Tatsuya Sunamoto, Kurashiki, JP;
Tadao Yoshikawa, Kurashiki, JP;
Kuraray Co., Ltd., Kurashiki-shi, JP;
Abstract
An apparatus for making an inflation film formed by extruding a raw resin in a molten state through a circular die to form a tubular film, and expanding the tubular film by the pressure of a gaseous medium introduced into an inner space thereof, while the tubular film is being cooled. The apparatus includes a cooling ring, at least one air ring coaxial with the circular die, and an adjusting device for adjusting the temperature of a gaseous medium, blown from the air ring, to a range effective to retain the tubular film, then still in a molten phase, in a condition in which the tubular film is inflated. A method for making an inflation film is also disclosed.