B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
190/150
B65D 25/54 (2006.01) B29D 23/00 (2006.01) B65D 1/12 (2006.01)
Patent
CA 1255241
ABSTRACT OF THE DISCLOSURE DIMENSIONALLY STABLE THERMOPLASTIC TUBULAR ARTICLES For heat-setting tubular articles (such as can bodies) of an at least partly biaxially oriented crystallisable polymer, preferably a saturated linear polyester such as polyethylene terephthalate, e.g. for thermally processable food containers, a tube of the polymer is fitted over a mandre1 and clamped at its ends to the mandrel at a temperature below the glass transition temperature of the polymer. The tube is then heated, e.g. by inserting a heater into the interior of the mandrel, above the temperature to which it is to be heat-set (at least 60°C above for PET) whereupon it shrinks into contact with the mandrel but is restrained from axial or further radial shrinkage. The tube and mandrel are cooled to below the heat-set temperature and the tube may then be cut into can body sections by knives engaging in circumferential grooves . Contact between the tube and mandrel is released, e.g. by forcing compressed air out through small holes in the mandrel surface to allow the tube and mandrel to be separated. Tubular bodies with one closed end can be heat-set on a mandrel with a correspondingly shaped end.
501674
Butcher Peter E.
Dick David A.
Nicholas James W.
Robinson Melvin E.r.
Staines Glyn
Mb Group Plc
Meredith & Finlayson
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