Multi-layer pex pipe and methods for forming the same
AssigneeReliance Worldwide Corporation
InventorMichael Shane Leo CASAVANT
Life of this patent
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Abstract
The present disclosure relates to a multi-layered PEX pipe where the core layer or center layer is a cross-linked polyethylene PEX which is sandwiched between two stabilized Polyethylene layers that are not cross-linked. The core PEX-a layer is a major proportion of the pipe's cross sectional area and thus is the primary stress-bearing layer of the pipe product. The present disclosure also relates to a method of extruding all layers simultaneously to make a composite PEX pipe.
Claims15
A method of making an elongated tubular element, comprising:
- simultaneously extruding a first layer of resin, a second layer of resin, and a third layer of resin through a die head to form the elongated tubular element having a circular cross-section, wherein the first and third layers of resin comprise non-cross-linkable material and the second layer of resin comprises a cross-linkable material;
- and
- exposing the elongated tubular element to infrared lamps to cross link the second layer of resin of the elongated tubular element.
An elongated tubular element, comprising:
- a first layer of resin having a non-cross-linkable material;
- a second layer of resin having a cross-linkable material, and
- a third layer of resin having a non-cross-linkable material;
- wherein the mass percent of the first and third layers is less than 10%;
- and
- wherein the first, second, and third layers are simultaneously co-extruded through a die head to form the elongated tubular element having a circular cross-section.
A three-layer co-extruded pipe, comprising:
- an elongated tube wall having three layers simultaneously co-extruded together, the three layers from outside within be respectively a color layer, a main PEX layer, and a protective layer.
Dependencies are inferred from the claim text.