Process and apparatus for producing rubber hose with textile thr

Details Process and apparatus for producing rubber hose with textile thr Process and apparatus for producing rubber hose with textile thr

1976-07-20

1978-09-05

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

156149, 264 89, 264 90, 264103, 264173, 264236, 264347, 425114, B29D 2305

Patent

active

041120310

ABSTRACT:
Rubber hose with textile thread reinforcing is produced by extruding an inner tube of rubber material, cooling the extruded tube, applying a covering of textile thread over the inner tube and then extruding an outer layer of rubber material over the textile layer. Just before the outer layer is extruded on the inner tube it is heated by subjecting it to an ultrahigh frequency field. The outer layer is extruded on under a vacuum so that the inner tube which has been softened by the UHF heating is supported by the resulting pressure differential. The resulting hose is then vulcanized. By reason of the preheating of the inner tube, the inner and outer rubber layers are at approximately the same temperature and hence vulcanized equally. The application of a vacuum during the second extrusion has the further advantage of avoiding air inclusions between the inner and outer rubber layers.

REFERENCES:
patent: 2525662 (1950-10-01), Freeman
patent: 2888954 (1959-06-01), Gates
patent: 3051992 (1962-09-01), Bradley
patent: 3310447 (1967-03-01), Matthews
patent: 3627610 (1971-12-01), Guelich et al.
patent: 3824141 (1974-07-01), Miller et al.
patent: 3883384 (1975-05-01), Hopkins
patent: 3988189 (1976-10-01), Sullivan

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