Structures of plastics material

Details Structures of plastics material Structures of plastics material

1989-06-28

1990-09-04

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

1562735, 1562755, 1563046, 264236, 264248, 264250, 264265, 264310, 264347, 425506, 425507, B29C 7102, B29C 7104, B29C 6502

Patent

active

049542990

ABSTRACT:
Large fittings or other structures are made by rotationally moulding a first component 18 of polyethylene and joining cylindrical pups 20, 22, 24 of polyethylene to the component by butt fusion joints 26, 28, 30. The structure within the boundary 50 is irradiated with gamma radiation followed by post-heating to remove free radicals. The extremities of the pups are shielded to prevent irradiation. Their capability to be joined to polyethylene pipes 12, 14, 16 by butt-fusion joints 32, 34, 36 is unimpaired. The irradiation introduces cross-linking to give improved properties such as impact resistance and stress crack resistance and to bring the fitting within the specification for polyethylene pipe for natural gas distribution. The joints 26, 28, 30 are made using differential heating of the ends to be joined to compensate for differences in melt flow index. Alternatively, the component 18 is slightly irradiated to lower its MFI before the pups are joined to it.

REFERENCES:
patent: 3576933 (1971-04-01), Bates
patent: 3809737 (1974-05-01), Rogers et al.
patent: 3989787 (1976-11-01), Scott, Jr. et al.
patent: 4056421 (1977-11-01), Jarvis
patent: 4318763 (1982-03-01), Bieler et al.
patent: 4555379 (1985-11-01), Marihger et al.
patent: 4863536 (1989-09-01), Heidenhaih et al.
patent: 4877562 (1989-10-01), Wilson et al.

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