WPC raw materials - WPC Raw Materials Douglas J. Gardner...

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1 WPC Raw Materials Douglas J. Gardner Professor of Wood Science Acknowledgements • Stephen Faehner – American Wood Fiber • Thomas Dombrowski- Specialty Minerals • David Murdock – Fiber Composites (formerly with Davis Standard) • Bill Sigworth – Chemtura (formerly Crompton)
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2 WPC Raw Materials • Polymers (Thermoplastics) • Wood • Mineral Fillers • Additives Physical form of Thermoplastics •V i r g i n – Pellets – Powders
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3 Thermoplastics • Amorphous –PVC –PS • Crystalline –LDPE –HDPE –PP • Engineering – Nylon –PET Thermoplastic Melt Temperatures • Thermal Limits –Tm<Td • Polyolefins – Poly(styrene) – Poly(ethylene) • HDPE, LDPE – Poly(vinyl chloride) – Poly(propylene) Temperature (C) 0 50 100 150 200 250 PVC PP HDPE LDPE PS Wood Degradation
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4 Thermoplastic Properties The “Big 3” HDPE PP PVC Specific Gravity 0.95 0.91 1.37 Crystallinity, % 70-90 30-40 10-20 Tensile Modulus, MPa 700 1400 3000 Water Abs, % 0.01 0.01 0.24 Resistance to Heat, o C 115 130 75 Burn Rate Slow Slow Self Ext Weatherability (5 Best) 3 2 4 Processing Recycled PP Rope
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5 Processing Recycled Rope First Project 3 step process 1. Shredding 2. Granulation 3. Pelletizing Second Project 1 step process 1. Granulation Identify proper feeder
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This note was uploaded on 12/21/2010 for the course AEWC 430 taught by Professor Dg during the Fall '08 term at University of Maine Orono .

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WPC raw materials - WPC Raw Materials Douglas J. Gardner...

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