Patent ID: 9649794
Date: 2017-05-16
CPC Classifications: B29C,B29D,B29K,B29L

Claim:
1. A method of reducing the number or size of voids in a polyurethane formed in situ in a container, comprising forming a flow of at least two reactive polyurethane formulation components from a component source such that at least a portion of the flow contacts an inner surface of a liner of the container, the inner surface being (1) modified over at least 25 percent thereof by either (a) profiling features, said profiling features each having an average height-to-surface measurement ranging from 0.5 mm to 20 mm; or (b) engraving features, said engraving features having a depth-to-surface measurement ranging from 0.1 mm to 0.3 mm; the profiling or engraving features being repeated at intervals that range from 2 to 5 times the height-to-surface or depth-to-surface measurement, respectively; wherein an added surface area of the inner surface of the liner is at least 25 percent greater as compared to a smooth inner liner without the profiling features or the engraving features; or (2) a mesh or having a mesh interposed between the inner surface and the component source, wherein the mesh has an average pore diameter ranging from 1 mm to 40 mm; under conditions such that a polyurethane is formed, the polyurethane having fewer or smaller voids than a polyurethane formed under identical conditions but without a modified inner surface.