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| A plastic pallet is formed from recycled plastic lumber by melting sections of runners and cross members and contacting them to join other runners and cross members to form a pallet. A simple low cost pallet fabrication machine has been developed. The machine consists of an assembly table, cross members for supporting and moving pallet runners in a vertical direction, a support table for a pallet cross member, hot plates moveable in a vertical direction and in a horizontal direction for insertion between the runners and the cross member, and a force bar moveable in a vertical direction for applying a force to the runners, hot plates, and cross member. A simple process (versus injection molding or thermoforming) for producing a plastic pallet from recycled lumber has been developed in which the runners are placed on a support bar and raised in a vertical direction, a cross member is placed on a support table, hot plates are inserted between the runners and cross member, pressure is applied by means of a force bar, and a portion of the runners and cross member is melted. Afterwards, the hot plate is withdrawn by raising the runners and hot plate and the molten section of the runners and cross member are brought in contact to join the runners and cross member. The developed process is less expensive than injection molding or thermoforming processes. Field testing performed on such plastic pallets shows excellent performance versus wood pallets.recycling plastic continues United States great need increased utilization recycled products extruded known lumber Plastic similar shape texture wood counterpart Recycled features benefits pallet industry large amounts hardwood softwood 45 billion feet 1995 37% total production federal government increasingly concerned environmental impact continued consumption price rise segments looking alternative post-consumer good introduced injection molded thermoformed pallets mainly virgin molding expensive Alternatively pieces fastened metallic screws bolts present stress points fracture failure separation problems addresses inexpensive reliable joining durable overall objectives development device summary elements claims summarized below Summary machine runners cross members 1) cross-member 2) maintaining least essentially transverse relation 3) hot plate positioned heating melting simultaneously portion top bottom spaced apart respect pneumatic vertical movement unit down direction parallel along Finally (vertical) inserted withdrawn surfaces heated molten state pressure application applies layered assembly melts contact weld bond welding assemblies base assembler table four legs ends sides jointed fasteners nuts modular construction permanent structure Welding suited runs The current effective solid plastics welds steps loading separating gap 4) inserting 5) contacting first second opposite 6) temperature sufficient either 7) 8) 9) withdrawing 10) region further aided force |
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