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US 4,826,423 AGranted
Construction of thermoplastic tubes with tubular ribs by helical winding upon a mandrel
AssigneeChevron Research Company
InventorsEric E. Kemp, James H. Miller, Leonard F. Sansone
Life of this patent
Estimating the term…
Abstract
An apparatus for the production of reinforced tubes by helical winding of thermoplastic strips and reinforcing members on a rotating mandrel, comprises a dual orifice extrusion die means capable of extruding a plastic strip in several different widths while simultaneously feeding a reinforcing member to the rotating mandrel.
Claims4
In an apparatus for producing a tube by helical winding, the combination comprising:
- a rotating mandrel around which said tube is formed by helical winding;
- a dual orifice extrusion die means,
- a. which is capable of directing and continuously extruding a thermoplastic strip to said rotating mandrel in overlapping or abutting relationship between the edges of adjacent turns of said thermoplastic strip around said mandrel,
- b. which is capable of continuously feeding a tubular rib to said rotating mandrel in the same helical period as said thermoplastic strip,
- c. comprising a strip due means for said thermoplastic strip which is capable of effecting extrusion of said thermoplastic strip in several different widths by means of a multiplicity of fixed strip die orifices of different sizes,
- d. comprising a tubular rib die means capable of extruding said tubular rib in one or more sizes by means of a multiplicity of fixed crosshead die orifices of different sizes, and
- e. the flow of thermoplastic material is diverted to one crosshead die orifice and to one strip die orifice by valve means;
- and
- means for controlling the relative longitudinal motion of said dual orifice extrusion die means with respect to said mandrel.
6 more elements
In an apparatus for producing a tube by helical winding, the combination comprising:
- a rotating mandrel around which said tube is formed by helical winding;
- a dual orifice extrusion die means,
- a. which is capable of directing and continuously extruding a thermoplastic strip to said rotating mandrel in overlapping or abutting relationship between the edges of adjacent turns of said thermoplastic strip around said mandrel,
- b. which is capable of continuously feeding a tubular rib to said rotating mandrel in the same helical period as said thermoplastic strip,
- c. comprising a strip die means for said thermoplastic strip which is capable of effecting extrusion of said thermoplastic strip in several different widths by means of several movably interchangeable strip die orifices of different width and/or height to accommodate the manufacture of tubes of different helical periods and/or strip layer thickness,
- d. comprising a tubular rib die means capable of extruding said tubular rib in one or more sizes by means of several movably interchangeable crosshead die orifices of different size to accommodate various supporting hose diameters, and
- e. said rib and strip die means are connected to separate thermoplastic supply ports;
- and
- means for controlling the relative longitudinal motion of said dual orifice extrusion die means with respect to said mandrel.
6 more elements
Dependencies are inferred from the claim text.