A METHOD OF, AND APPARATUS FOR, WRAPPING ARTICLES IN A PLASTIC FILM

摘要

A method of wrapping articles in a plastic film. Stretch wrapping film (3) supplied from at least one supply roll (2) is folded and connected to form a tube having a passageway sufficiently large to introduce unit into it and transport it therein, without contacting the tube wall, whereafter the tube is stretched in the longitudinal direction to constrict it and cause it to tautly contact the unit being wrapped. The stretched and constricted tube is closed, possibly sealed and separated in front of and behind the unit being wrapped. A wrapping apparatus comprises a folding and guiding unit which brings the film into a tubular form, and elements connecting the film to form a closed tube. A sleeve member (6) cooperates with positive transport means placed alongside its outer circumference. Drawing means positioned downstream of the positive-transport means are movable in the direction of film transport at a higher velocity than that of the positive-transport means. The machine further comprises a clamping mechanism (4), optionally a sealing mechanism, a separating mechanism and transport means. The transport means are interrupted approximately at the level of the downstream end of the sleeve member, with the upstream portion of the transport means extending through the sleeve member down to at least the downstream end thereof.