B - Operations – Transporting – 31 – B
Patent
B - Operations, Transporting
31
B
271/24, 93/37
B31B 21/02 (2006.01) B31B 19/98 (2006.01) B31B 23/00 (2006.01) B31B 41/00 (2006.01) B65H 45/22 (2006.01) B65H 45/28 (2006.01)
Patent
CA 1190079
METHOD AND APPARATUS FOR FOLDING AND CUTTING ARTICLES FROM A TUBULAR THERMOPLASTIC ENVELOPE ABSTRACT There is provided an apparatus for producing a plurality of longitudinally folded articles from an elongate, continuous, tubular envelope of thermoplastic material. Typically, these articles are bags such as garbage bags. Transverse seals are firstly provided across the tubular envelope at spaced-apart locations, without severing the same, and then folding means are provided downstream of the heat-sealing region, for folding the tubular envelope in a continuous way about a longitudinal line which is usually substantially midway of its width . Severing means are located downstream of the folding means, for severing the tubular envelope transversely at or adjacent the transverse seals, to provide separate, longitudinally folded articles. A further folding means may be downstream of the first-mentioned folding means, in order to provide a second fold about a longitudinal line which is typically substantially mid-way of the width of the tubular envelope in its once-folded condition. A subsequent station may also be provided for folding the severed articles about transverse fold lines, and this can be done once, twice or even more times. The preferred means for continuously folding the tubular envelope includes the provision of a substantially triangular plate having two edges meeting at an apex, with the apex typi- cally located about midway of the width of the tubular envelope, and pointing in the direction in which the envelope is travelling. The envelope is pulled along one surface of the triangular plate, and then is led away from that surface obliquely and around a roller, in order to fold the same about a longitudinal line.
403534
Chandra Satish
Fairbairn Arol B.
Winklareth Paul
Hopley William G.
Union Carbide Canada Limited
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