B - Operations – Transporting – 65 – B
Patent
B - Operations, Transporting
65
B
156/2.5
B65B 11/12 (2006.01)
Patent
CA 1302859
TITLE OF THE INVENTION: A METHOD OF, AND APPARATUS FOR, WRAPPING ARTICLES IN A PLASTIC FILM ABSTRACT OF THE DISCLOSURE A method of wrapping articles in stretch wrapping plastic film and appropriate apparatus for practicing this method are disclosed. An article to be wrapped is surrounded by a plastic film by forming the film into a tube around the article and sealing the longitudinal edges of the film in such a way that the tube does not contact the surrounded article. The tube and article are then conveyed along the axis of the tube and at a point downstream from the tube sealing a portion of this tube is longitudinally stretched causing it to constrict on the article. The stretching tension is preferably isolated from the tube forming and sealing such that the tube may be formed in a continuous manner. The stretched and constricted portion of the tube is closed in front of and behind the article being wrapped and then separated behind the wrapped article. Of course, either the initial end of the tube or the separation behind the previous article provides a tube terminus in front of each article. These tube terminuses may be clamped and heat sealed. This procedure can be affected by an apparatus having means for supplying and discharging the articles to be wrapped, means for supplying the plastic film and forming it into a non-contacting tube about the articles to be wrapped and sealing the longitudinal edges of the tube, means for stretching the tube in a longitudinal direction and means for separating the stretched and constricted tube portion from the unstretched portion. The stretching operation is conveniently affected by a combination of a sleeve over which the tube passes and through which the article to be wrapped passes, a positive-transport means, such as rollers, which cooperate with the outer surface of the sleeve to give the tube a certain forward velocity and a means downstream of the sleeve which can transport a portion of the tube downstream at a rate faster than the output of the positive-transport means.
573635
Mersman Jan Cornelis
Van Eijsden Cornelis
Borden (nederland) B.v.
Macrae & Co.
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