Package making – Methods – Conforming by stretching or shrinking of cover over contents
Patent
1988-08-02
1989-10-10
Culver, Horace M.
Package making
Methods
Conforming by stretching or shrinking of cover over contents
53450, 53550, 53556, 53389, B65B 1112, B65B 906, B65B 5300
Patent
active
048723029
ABSTRACT:
Articles are stretch wrapped in a plastic film by forming a tube around them from a flat plastic film, sealing the longitudinal edges of the film and then longitudinally stretching the tube to cause it to constrict on the articles being wrapped. The tube is initially of a sufficient diameter to avoid contact with the articles. Both the articles and the tube are conveyed downstream. The tube is fed downstream by a positive transport means which isolates the tube forming operation from any downstream tension. A downstream mechanism pulls on the tube faster than the positive transport means conveys it causing the tube to stretch and constrict on the articles to be wrapped. The tube is closed behind each set of articles and the downstream portion is severed from the upstream portion forming a tube terminus behind one set of articles and in front of the next set. In a preferred version the positive transport means is a sleeve over which the tube passes and through which the articles pass combined with rollers which press the tube against the sleeve and control its forward progress over the sleeve.
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Mersman Jan C.
van Eijsden Cornelis
Borden BV
Culver Horace M.
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