| 摘要 |
<p>The invention presents to the art a novel, improved shoe stiffener which comprises co-extruded layers of plastics film. The shoe stiffener comprises co-extruded layers of plastics film, a first of the layers comprising an ionomeric material and providing a main body of the stiffener and a second layer comprising a plastics material which does not adhere to a fusion press under conditions normally encountered therein during bonding of a shoe stiffener to a shoe upper. Nylon 6 is the preferred second layer plastics material. The co-extrusion product replaces fabric backed shoe stiffeners in which flaws induced in the film by the fabric may provide notches from which cracks in the material can propagate.</p> |
