公开(公告)号：US3558216A

公开(公告)日：1971-01-26

申请号：US3558216D

申请日：1968-09-25

Applicant: AGENCY IND SCIENCE TECHN

Inventor： KUBOTA KATSUYA

IPC: B29C71/00 ,  B29C71/02 ,  G02B5/18 ,  B29D11/00 ,  B32B23/08 ,  B32B27/32

CPC classification number: B29C71/0063 ,  B29C71/02 ,  B29K2023/06 ,  B29K2995/0063 ,  G02B5/1833 ,  G02B5/1847 ,  Y10S359/90 ,  Y10T428/31721 ,  Y10T428/31888

Abstract: A METHOD OF MANUFACTURING POLYETHYLENE DIFFRACTION GRATING IN WHICH A HIGH OR MEDIUM DENSITY POLYETHYLENE FILM HELD BETWEEN CELLOPHANE FILMS OR POLYIMIDE FILMS IS PASSED AT A CONSTANT VELOCITY OVER AND MAINTAINED IN CLOSE CONTACT WITH HEATING ZONE AND COOLING ZONE WHICH ARE MAINTAINED AT PREDETERMINED TEMPERATURES.