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Plastic lumber-technology
Plastic lumber-technology
Plastic lumber-technology
Plastic lumber-technology
Plastic lumber-technology
Plastic lumber-technology
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Plastic lumber-technology

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for more downloads visit www.mechanical-online.com

for more downloads visit www.mechanical-online.com

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  • 1. Plastic Lumber Technology
  • 2. Manufacturing Process• Making High Density Polyethylene (HDPE) Product– Material preparation– Grinding into chips– Screw extruder– Melting and Mixing– Molding (finished product)
  • 3. Application: Railroad Ties• More durable than wood• More cost effective in long term• 15 million wood ties replaced yearly• Textured for greater friction• Comparable in weight to wooden ties.
  • 4. Application: Plastic Bridge• Fort Leonard Wood, Missouri (1998)• First plastic bridge to support vehicle traffic• 13,000 lb of recycled plastic• Span of 25 ft• Supports load of 100 lb/ft2• Cost of $31,000• Replaced wooden bridge
  • 5. Physical Characteristics• Less stiffness and less strength than wood underwinter and summer conditions• Becomes brittle at low temperatures• Becomes soft at high temperatures• Less axial strength than natural lumber undercompression, flexure, and tension• Holds conventional wood fasteners well• Comparable weight to wood• Density is between 0.64 and 0.68 g/cc
  • 6. Physical Characteristics• Less stiffness and less strength than wood underwinter and summer conditions• Becomes brittle at low temperatures• Becomes soft at high temperatures• Less axial strength than natural lumber undercompression, flexure, and tension• Holds conventional wood fasteners well• Comparable weight to wood• Density is between 0.64 and 0.68 g/cc

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