Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1987-02-05
1990-09-18
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264255, 264270, 264311, B28B 120
Patent
active
049576836
ABSTRACT:
The wall of the pipe section comprises a plurality of superimposed layers, which are formed from plastic and inorganic materials. The layer of inorganic materials forms the central layer, whose wall portions are in each case connected by a connecting layer to a reinforcing layer. While the central layer ensures the dimensional rigidity of the pipe section, the two reinforcing layers, which are made from a fiber-reinforced plastic, ensure the strength of the pipe. This combination of different layers is an inexpensive solution, which only requires that amount of expensive plastic as is required for the strength of the pipe. Through applying a plastic protective layer to the outer circumference of the pipe and a protective layer to the inner circumference of the pipe, the durability of the pipe section is ensured.
REFERENCES:
patent: 3217077 (1965-11-01), Cocke
patent: 4171626 (1979-10-01), Yates et al.
patent: 4183883 (1980-01-01), Blair
patent: 4292364 (1981-09-01), Wesch et al.
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