| http://www.w3.org/ns/prov#value | - The three layers are advanced from the supply station 73 to an alignment station 79 comprising preferably a support roll 80 followed by 2 nip rollers 82 and 84 for longitudinally aligning the layers 24, 26 and 28 prior to their generally horizontal advancement to an extrusion station 86 which may comprise, for example, a quantity of molten plastic material such as vinyl chloride or the like.
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