Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1990-10-31
1992-09-01
Ryan, Patrick J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
428323, 428324, 428480, 428516, B32B 702
Patent
active
051437783
ABSTRACT:
An improved laminated structural material; an improved method of forming a relatively rigid structural article such as a pallet; and an improved structural article using the invention laminated structural material. The invention article is formed by separately extruding relatively thin outer skin layers of a 25% talc filled polyethylene material and a relatively thick central core layer of an essentially virgin polyethylene material; bonding the layers together to form a composite laminate strip including the relatively thin talc filled outer skins and the thick central core layer of virgin polyethylene; severing the strip to form upper and lower sheets; heating the upper and lower sheets in an oven to place them in a flowable condition; delivering the upper and lower sheets respectively to upper and lower molds carried by upper and lower platens of a press; vacuum forming the upper and lower sheets respectively to the upper and lower molds; and thereafter bringing the platens of the press together to selectively knit or fuse the upper and lower sheets together to form the article. The article produced by the invention methodology costs only slightly more than an article formed of virgin polyethylene material and yet has vastly superior stiffness characteristics as compared to the virgin polyethylene article while retaining substantially all of the superior impact characteristics of the virgin polyethylene article.
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Evans Elizabeth
Ryan Patrick J.
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