Multi-layer plastics material sheet

Details Multi-layer plastics material sheet Multi-layer plastics material sheet

B - Operations, Transporting

32

B

B32B 3/28 (2006.01)

Patent

CA 2070077

ABSTRACT Thermoplastics material corrugated sheet is provided having two outer layers sandwiching an inner structure, the mass of which is substantially evenly distributed between the outer layers. The sandwiching or laminating process is conveniently carried out from three separate extruders providing a vertical fall of layers which are laminated by the use of at least some of heat pressure, and chill rollers against the vertical layers. On pressing the two outer layers together the inner structure crumples so that it is evenly distributed between the layers and does not form separate lumps which tend to hold the outer layers apart. When the layers have been pressed together they may be heat sealed to close channels between the layers. POLYBOX\10APP

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