Container modifications to minimize defects during reactive polyurethane flow
US9649794B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2016 |
| Grant date | May 16, 2017 |
| Priority date | — |
| Expiry date | Feb 11, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7622
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of reducing the number or size of voids in a polyurethane comprises reacting the formulation components in a container having an inner surface, or having a liner that has an inner surface, that has been modified to reduce the shear forces that normally accompany introduction of such components into a container. This is done by modifying the inner container's or container liner's surface by profiling and/or engraving it, or by including as a liner a mesh. The profiling and/or engraving or mesh serves to alter the formulation's flow dynamics such that the polyurethane has fewer and/or smaller voids, i.e., has a more uniform density, than polyurethanes formed without the modification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.