Flexible, tear resistant composite sheet material and a method for producing the same
US4894280A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1987 |
| Grant date | Jan 16, 1990 |
| Priority date | — |
| Expiry date | Dec 21, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/696
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A flexible tear resistance composite sheet material is disclosed comprising a web of thermoplastic microfibers with from 35 to 80 percent by weight of staple fibers homogeneously dispersed throughout the web. The composite is subjected to a sufficient quantity of heat and pressure such that the thermoplastic microfibers at least partially melt and compact into a contiguous sheet with the intact staple fibers being dispersed therein. Located throughout the sheet are a plurality of voids which act as tear stops. The resulting material has a void volume of about 33 to about 55 percent and a machine direction slit trapezoidal tear resistance greater than or equal to 1.7 kg per 100 g/m.sup.2 equivalent basis weight. Also disclosed herein is a process for making the composite sheet material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.