B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 3/30 (2006.01) B29C 53/26 (2006.01) B29C 55/02 (2006.01) B29C 55/08 (2006.01) B29C 55/18 (2006.01) B29C 59/04 (2006.01) B32B 3/26 (2006.01) B29C 53/22 (2006.01)
Patent
CA 2126759
A cross laminate of two films, each of which is uniaxially or unbalanced biaxially oriented, the films being arranged so that the major axes of orientation criss-cross each other (steps 1 to 3), is treated in a calendering process in which machine direc- tion ribs are formed which are thicker than the sheet between the ribs and which have a configuration which confers increased re- sistance to bending over a line perpendicular to the rib. The ribs are formed by a combination of passage between grooved rollers ("lateral calendering") (steps 4 and 6), the grooves of which include inclined walls on opposing grooves between which the mate- rial of the laminate is squeezed, longitudinal stretching (step 5) and heat treatment (step 10). In a preferred process a sandwich of two cross-laminates is subjected sequentially to passage between a first set of grooved rollers (step 4), longitudinal stretching (step 5) and passage through a second set of grooved rollers (step 6) in which the undulations created in the first set of rollers are regis- tered with the second set of grooved rollers, followed by heat treatment (step 10), for instance an ironing process. The cross sand- wich is then cooled (step 11) and separated into two cross laminates (step 12).
Fetherstonhaugh & Co.
Rasmussen Ole-Bendt
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