Puncture resistant material
AssigneeDupont Safety & Construction, Inc.
InventorsDavid F. Erb, Jr., Eric A. Barter
Life of this patent
Estimating the term…
Abstract
A method for making puncture resistant material is made by aggressively twisting high modulus continuous filament polypropylene yarns and weaving the twisted yarns into a tight weave. Batting materials are placed adjacent the woven layer (which may comprise one or more individual woven layers) to form a stack and the stack is needlepunched to form a consolidated material. The material is heat treated and calendared and the finished product may be used in applications where puncture resistance is required, such as in a shoe insole material.
Claims9
A method of making a puncture-resistant fabric, comprising:
- twisting high modulus polypropylene filament yarns;
- weaving said continuous filament yarns to form a tightly woven layer;
- placing a batting material of thermoplastic fibers adjacent said woven layer;
- needlepunching said batting material in a perpendicular direction into the woven layer to form a consolidated material;
- heating said consolidated material above the glass transition temperature of said thermoplastic fibers, partially melting without completely melting the thermoplastic batting fibers, thermally shrinking the fibers and increasing the density of the consolidated material;
- calendaring the consolidated material formed in the heating step to form a puncture-resistant fabric.
Dependencies are inferred from the claim text.