Shaped article with thermoformed composite sheet
AssigneeE. I. Du Pont de Nemours and Company
InventorDimitri P. Zafiroglu
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Abstract
An improved shaped article comprising a thermoformed composite sheet, which is a layer of thermoplastic polymer attached to a surface of a lightweight conformable fabric, the other surface of the fabric being attached to a layer of rigid foam, provides the article with improved wall thickness uniformity and impact resistance.
Claims4
A shaped article which comprises a thermoformed composite sheet that has an outer layer of thermoplastic polymer attached to a first surface of a relatively lightweight conformable fabric layer, characterized by the composite sheet having a thermoformed area expansion factor of at least 1.5, the conformable fabric amounting to no more than 20% of the weight of the thermoplastic layer, the surface of the fabric opposite the first surface being attached to a layer of rigid foam having a specific volume in the range of 3 to 30 cm.sup.3 /gram and a thickness of at least 2.5 cm and the fabric layer being a nonwoven fabric stitchbonded with elastic threads, or a needled felt or a knitted fabric.
Dependencies are inferred from the claim text.