Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Reshaping running or indefinite-length work
Patent
1975-12-22
1979-05-01
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Reshaping running or indefinite-length work
264119, B29C 1700, D06C 2304
Patent
active
041523890
ABSTRACT:
A method for improving the uniformity in visual appearance of a film-fibril nonwoven sheet of thermoplastic polymer comprising passing said sheet through the nip formed between two rolls, one of which has a hot conductive surface with a specified pattern of bosses and the other of which has a surface with a durometer hardness of at least 70 (Shore D scale); applying a specified pressure to the sheet while heating the pattern areas to fuse the film-fibrils together on the surface of the sheet to form transparent windows in the pattern areas without substantially fusing the film-fibrils in the remaining areas of the sheet.
REFERENCES:
patent: 3478141 (1969-11-01), Dempsey
patent: 3619339 (1971-11-01), Garrett
E. I. Du Pont de Nemours and Company
Lowe James B.
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