Apparatus and method for extruding single and multiple layers of plastic
OwnerVijay Anandinventor
Life of this patent
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Abstract
A method and apparatus for extruding single or multiple layers of plastic on an electrical conductor without having to adjust the concentricity of layers every time the tooling is changed to make different sizes.
Claims32
In an extrusion apparatus for continuously forming a sheath of plastic material comprising a main body, a die and tip assembly, and at least a first coating material introduction port, the improvement comprising at least a second coating material introduction port, a first coating material flow adjustment means, and a second coating material flow adjustment means, wherein
- said first coating material introduction port and said first coating material flow adjustment means comprising a first coating material section of said extrusion apparatus wherein said first coating material flow adjustment means is located downstream from said first coating material introduction port and upstream from said die and tip assembly;
- said second coating material introduction port and said second coating material flow adjustment means comprising a second coating material section of said extrusion apparatus wherein said second coating material flow adjustment means is located downstream from said second coating material introduction port and upstream from said die and tip assembly;
- and
- said first and said second coating material flow adjustment means being located upstream from said second coating material introduction port relative to said tip and die assembly.
A method for extruding multiple layers of material to form multiple layers of material, comprising the steps of:
- (a) providing a first material in a molten state;
- (b) forming said first molten material into a first generally tubular sheath;
- (c) adjusting the concentricity of the wall thickness of said first sheath;
- (d) introducing said concentric first sheath to a die and tip assembly;
- (e) extruding said concentric first sheath;
- (f) providing a second material in a molten state simultaneous to providing said first material;
- (g) forming said second molten material into a second generally tubular sheath;
- (h) adjusting the concentricity of the wall thickness of said second sheath;
- (i) introducing said concentric second sheath to a die and tip assembly;
- and
- (j) extruding said concentric second sheath over said concentric first sheath.
Dependencies are inferred from the claim text.