Process for producing a reinforced tube
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United States of America Patent
Stats
-
Jan 22, 1985
Grant Date -
N/A
app pub date -
Jul 14, 1983
filing date -
Jul 21, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Process of making a reinforced tube including extruding a thin walled tube, encircling the tube with a completely closed layer of helically extending strip coated with heat activatable adhesive material. The tube is then passed through a sizing die heated at its entrance to activate the adhesive while subjecting the tube to relatively low internal pressure to bond the tube to the layer of strips. The integrally connected tube and strips are then passed through pinch rolls which close the tube and maintain the pressure upstream from the rolls different from the downstream pressure. Further reinforcing strips and an outer sheath are thereafter provided.
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