Precemented welt
AssigneeRextrude Co.
InventorDaniel C. Harkins, Sr.
Life of this patent
Estimating the term…
Abstract
A precemented welt for shoe construction, and methods of making such a welt. The welt comprises a body section, and a solid adhesive surface layer which can be activated to form a bond. The adhesive does not activate at typical truck trailer temperatures, so the welt material can be easily shipped. In one embodiment, the adhesive comprises an aromatic polyurethane elastomer, which can be activated by heating the welt to a temperature of at least 225° F. for at least 30 seconds.
Claims16
A precemented welt, comprising
- a body member;
- and
- an inactive solid surface layer attached to the body member, comprising an aromatic polyurethane elastomer,
- wherein the solid surface layer and the body member are attached without an organic solvent.
A precemented welt for attachment to a shoe, comprising a body member;
- and
- an inactive solid surface layer attached to the body member,
- wherein the solid surface layer is characterized in that it becomes activated when exposed to a temperature of at least 225° F. for a period of approximately 30 seconds, but not when exposed to air at a temperature less than or equal to 140° F., and, when activated, constitutes an adhesive with sufficient strength to attach the body member to an adjacent material, and
- wherein, the inactive solid surface layer comprises an extruded thermoplastic polymer.
A precemented welt, comprising a body member and an inactive solid surface layer attached to the body member, wherein:
- the solid surface layer comprises an extruded aromatic polyurethane elastomer,
- the solid surface layer is not activated by exposure to air at a temperature less than or equal to 140° F.
A method of producing a precemented welt for a shoe, comprising;
- coextruding an aromatic polyurethane elastomer with a body member material to form a welt comprising an inactive solid surface layer attached to a body member.
A method of attaching a welt to a shoe, comprising
- providing a precemented welt, comprising;
- a body member,
- a solid surface cement layer attached to the body member, having the following properties:
- exposure of the solid surface cement layer to air at a temperature less than or equal to 140° F. does not constitute an activating condition for the layer, and
- the cement layer is in an inactivated state before attachment of the welt to a portion of the shoe,
- positioning the welt against the sole of the shoe,
- exposing the welt to a temperature of at least 225° F. for at least 30 seconds,
- to form a bond between the welt and the shoe having a strength of at least 30 psi.
A method of attaching a welt to a shoe, comprising
- providing a precemented welt, comprising
- a body member,
- a solid surface cement layer attached to the body member, wherein exposing the solid surface cement layer to air at a temperature less than or equal to 140° F. does not constitute an activating condition for the layer,
- positioning the welt against a sole of the shoe, and
- exposing the welt to a temperature of approximately 225° F. for approximately 30 seconds,
- to form a bond between the welt and the shoe having a strength of at least 30 psi.
Dependencies are inferred from the claim text.