Easy tear masking tape

Details Easy tear masking tape Easy tear masking tape

1987-07-27

1988-11-01

Thibodeau, Paul J.

Stock material or miscellaneous articles

Sheet, web, or layer weakened to permit separation through...

428167, 428172, 428343, 428906, B32B 330

Patent

active

047819570

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."

REFERENCES:
patent: 4397905 (1983-08-01), Dettmer et al.
patent: 4537809 (1985-08-01), Ang et al.

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