| 摘要 |
The invention is directed to open-channel extrusions of plastic materials. In one aspect, an open-channel tubing is formed by extruding a first plastic material forming an elongate tube having the open channel; and extruding a second plastic material filling the open channel such that the second plastic material forms a weak bond with the first plastic material, and the weak bond is then selectively broken or dissolved to yield the open channel in the first plastic material. The first and second plastic materials are different from one another and each comprises at least one of polyester, polyethylene, nylon, polyurethane, HDPE, plastic elastomers (TPE) and Kraton. The first and second plastic materials are preferably extruded at about the same time. In another aspect, at least one of the first and second plastic materials may be doped with an additive to form the weak bond. The process of the invention may further comprise the step of mechanically stripping or removing the second plastic material from the first plastic material, chemically dissolving the second plastic material using a chemical solvent, or separating the second plastic material in a thermal melting process. Mechanically stripping the second plastic material may further comprise pressuring or evacuating the extruded elongate tube. To chemically dissolve the second plastic material, the first plastic material may include an aramid plastic, the second plastic material may include a styrene plastic, and the chemical solvent may be acetone or MEK. High and low-temperature plastics may be used to separate in the thermal melting process.
|
