Plastic article or earthenware shaping or treating: apparatus – Including means advancing continuous length work through...
Patent
1976-05-27
1977-04-12
Spicer, Jr., Robert L.
Plastic article or earthenware shaping or treating: apparatus
Including means advancing continuous length work through...
425505, 425506, 425143, 4251748R, 425324R, 425404, 156494, B29C 1707, B29C 2712
Patent
active
040172295
ABSTRACT:
Apparatus for uniting at least two concentrically extruded tubular films of thermoplastic synthetic resin includes a mandrel located in the innermost of the films and having a leading conical portion and a trailing cylindrical portion to expand the innermost film in transverse direction substantially to the diameter of the outermost film. The mandrel is heated by electromagnetic waves produced by a high-frequency transmitter connected to a high-frequency coil surrounding the tubular films in the region of the mandrel. A temperature sensor connected to the mandrel senses the temperature of the latter and the sensed temperature is transmitted by an ultra shortwave transmitter connected to the sensor and ultra shortwave receiver connected to the high-frequency transmitter to control the latter and to maintain the temperature of the mandrel at a desired constant temperature.
REFERENCES:
patent: 3275725 (1966-09-01), Utz
patent: 3608019 (1971-09-01), Sato et al.
patent: 3677676 (1972-07-01), Hegler
patent: 3726743 (1973-04-01), Reifenhauser et al.
patent: 3754063 (1973-08-01), Schirmer
patent: 3770931 (1973-11-01), Gillistt
Spicer, Jr. Robert L.
Striker Michael J.
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