Stormwater Chambers Thermoformed from Coextruded Sheet Material
OwnerRobert J. DiTullio, Russell L. Herlacheinventors
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Abstract
A thermoformed storm water chamber has an exterior surface formed of first layer having an increased reflectance additive and an interior surface formed of a second layer. The increased reflectance additive is a pigment (other than a black pigment) or may be a mineral component. Optionally, a supplemental ultraviolet and/or antioxidant protection additive is also provided in the first layer. The thickness of the first layer is less than the thickness of the second layer, optionally in a 20%/80% of total thickness ratio. The two layers may be made from the same or different HDPE or blends thereof.
Claims27
A chamber comprising:
- an arch-shaped plastic body formed from a vacuum-molded polyethylene sheet having an exterior surface and an interior surface;
- the exterior surface of the body being a first layer comprising an increased reflectance coating;
- and
- the interior surface of the body being a second layer;
- wherein the first layer and the second layer are coextruded and each comprise a high density polyethylene (HDPE).
(canceled)
-9. (canceled)
A method of manufacturing a chamber, comprising steps of:
- extruding high density polyethylene resin pellets or a blend of different high density polyethylene resin pellets containing an increased reflectance additive from a die to form a continuous web of a first layer;
- extruding high density polyethylene resin pellets or a blend of different high density polyethylene resin pellets from a die to form a continuous web of a second layer;
- joining the first layer and second layer together to form a web;
- cutting the web into sheets;
- heating one of the sheets until the sheet is in a pliable plastic state for thermoforming;
- thermoforming in a vacuum mold, whereby the first layer is located on an exterior surface of the chamber.
A chamber comprising:
- an arch-shaped plastic body formed from a vacuum-molded polyethylene sheet having an exterior surface and an interior surface;
- the exterior surface of the body being a first layer comprising an increased reflectance coating;
- and
- the interior surface of the body being a second layer;
- wherein the first layer and the second layer are coextruded and each comprise a high density polyethylene (HDPE).
(canceled)
Dependencies are inferred from the claim text.