Method of manufacturing shrinkable tubing with integral tear str

Details Method of manufacturing shrinkable tubing with integral tear str Method of manufacturing shrinkable tubing with integral tear str

1998-11-06

2000-04-04

Sells, James

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 86, 156252, B32B 3116

Patent

active

060456418

ABSTRACT:
A method of continuously forming a packaging sleeve of heat-shrinkable thermoplastic with an integral tear strip, the sleeve comprising a flattened tube having a first wall and second wall connected along parallel first and second lines of connection; lines of weakness formed in the first and second walls proximate to one of the lines of connection; the lines of weakness and the line of connection defining tear strip zones therebetween; a reinforcing-levering band in the tear strip zones formed by welding superimposed portions of the first and second walls; the reinforcing levering band being disposed parallel to the lines of weakness and in combination with the zones and lines of weakness establishing a tear strip for opening the sleeve.

REFERENCES:
patent: 3259235 (1966-07-01), Sowle
patent: 3260358 (1966-07-01), Gottily et al.
patent: 3679048 (1972-07-01), Fujio
patent: 4963418 (1990-10-01), Isaka et al.

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