Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Patent
1988-07-01
1990-02-06
Robinson, Ellis P.
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
428155, 428212, 428220, 428343, 428354, 428355, 428500, 428502, 428516, 428906, 428913, 156183, 156184, 156196, 156210, D06N 704
Patent
active
048987620
ABSTRACT:
Film-backed pressure-sensitive adhesive tape that resembles conventional creped paper-backed masking tape but can be torn cleanly with the fingers, is prepared by extruding an isotactic polypropylene film, passing it through the nip between a rubber roll and a water-cooled embossed steel roll at a temperature and rate such that predominantly crystalline film is obtained. The embossed roll imparts a ridge-and-valley configuration to one surface of the film, valleys extending crosswise of the tape and having a depth greater than half the total film thickness. When the smooth face of the film is coated with pressure-sensitive adhesive, the resultant tape can be torn readily, using only the fingers, in a straight line crosswise of the tape. When subjected to a stretching force in the machine direction (at right angles to the ridges and valleys), the tape elongates uniformly without "necking down." A specific embodiment of this invention is a sterilization indicator tape made with the above described film.
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Brown Josephine S.
Sipinen Alan J.
Boeder Jennie G.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Robinson Ellis P.
Ryan P. J.
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