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Twinwall plastic most commonly refers to two exterior plastic sheets that are connected with a plastic support layer to create parallel channels. This design adds both impact toughness and the ability to support weight. Twinwall plastic may also be used to describe a pipe that has a smooth interior with exterior air filled ridges. [3]
Lumber prices. Presently there is a healthy lumber economy in the United States, directly employing about 500,000 people in three industries: Logging, Sawmill, and Panel. [62] Annual production in the U.S. is more than 30 billion board feet making the U.S. the largest producer and consumer of lumber. [62]
Particleboard with veneer. Particle board, also known as particleboard or chipboard, is an engineered wood product, belonging to the wood-based panels, manufactured from wood chips and a synthetic, mostly formaldehyde-based resin or other suitable binder, which is pressed under a hot press, batch- or continuous- type, and produced. [1]
The Weyerhaeuser Company (/ ˈ w ɛər h aʊ z ə r / WAIR-how-zər) is an American timberland company which owns nearly 12,400,000 acres (19,400 sq mi; 50,000 km 2) of timberlands in the U.S., and manages an additional 14,000,000 acres (22,000 sq mi; 57,000 km 2) of timberlands under long-term licenses in Canada. [4]
In this way the log is peeled into sheets of veneer, which are then cut to the desired oversize dimensions, to allow it to shrink (depending on wood species) when dried. The sheets are then patched, graded, glued together and then baked in a press at a temperature of at least 140 °C (284 °F), and at a pressure of up to 1.9 MPa (280 psi) (but ...
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Manufacturers claim plastic lumber is more environmentally-friendly and requires less maintenance than wood/plastic composites or rot-resistant wood. [2] Commercially available polyvinyl chloride fiberglass composite lumber sold for decking meets stringent fire code standards. [3] Plastic lumber can displace wood timber (as harvested by forestry).
[citation needed] PSL can be made from any wood species, but Douglas fir, southern pine, western hemlock, and yellow poplar are commonly chosen [9] because of their superior strength. The product is manufactured as a 12-by-12-inch (300 mm × 300 mm) or 12-by-18-inch (300 mm × 460 mm) billet in a rectangular cross-section, which is then ...