B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/670
B29D 7/22 (1980.01)
Patent
CA 1067264
ABSTRACT OF THE DISCLOSURE A novel method is provided for making carpet underlay. The method includes the steps of: providing a sheet of elawtomeric material which is adapted to define the carpet underlay; supporting the sheet on supporting means comprised of wire-like mesh material having openings with elongated flat shrip inserted therein; and subjecting the sheet to a controlled heated environment while supporting the sheet on the supporting means; the heated environment causing the sheet to soften and droop around the mesh material with the extent of drooping being limited by the flat strip means and the strip further preventing the sheet from passing through the openings in the mesh material; the heated environment also causing simultaneous expansion and curing of the sheet. In one variant, the supporting means comprises wire-like mesh material having a plurality of undulating members with each adjacent pair of undulating members being held together by a common tie mem- ber with the elongated flat strip means being supported by each undulating member and wherein the sheet, which has been softened and droops, thereby droops around the undulating and tie members. In another variant, the means is in the form of an endless conveyor means, and the heating of the sheet mesh material thereby forms a plurality of U-shaped channels in the upper sur- face of the sheet. By these steps, the heated environment also causes simul- taneous expansion and curing of the sheet. In this way, the carpet underlay is defined having a plurality of cooperating coplanar portions defined by the strip means separated by channels defined by the undulating and tie members.
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