Plastics material mesh structures
US5269631A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1992 |
| Grant date | Dec 14, 1993 |
| Priority date | — |
| Expiry date | Sep 30, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/184
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A starting material is provided having a rectangular grid of holes and the starting material is stretched in the MD to such an extent that the junctions are not significantly oriented, is stretched in the TD to such an extent that the junctions are not significantly oriented, and is finally stretched in the MD to such an extent that the junction centres thin down by at least 30% and there is significant narrowing down of the junction The resultant MD stretch is substantially greater than the resultant TD stretch. The MD strands, having thinned down and oriented to a substantial degree, cause the orientation to pass into the ends of the junctions and right through the junctions. The junctions increase in length by a ratio of at least about 2.5:1 and narrow down substantially. The ends of the junctions are not stretched more than 100% more than the centres. At each junction there is a thicker, parallel-sided, long zone which is oriented in the MD and has thinned down less than the mid-points of the MD strands so that there is continuous MD orientation running from end to end of the mesh structure. There are no dips in the junctions and the centres of the junctions are not substantial…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.