Patent GB-958142-A (GB)
Title: Improvements in and relating to heat-retaining or insulating means for personal or domestic use such as blankets, pads, garments and the like
Inventor: STEPHENAAL MANFRED HARRY
IPC: A47G9/02
Filed: 1961-06-19
Abstract: Flexible, resilient, spongy, foamed polystyrene sheet for a heat-retaining or -insulating means is produced by moulding pre-formed beads of foamed or expanded polystyrene into a block which is then cut into sheets by a knife so as not to seal the surfaces and render them brittle. The sheets are then passed several times through rollers whilst having a continuous jet of steam directed on to their surfaces.ALSO:A heat-retaining or insulating therapeutic pad comprises a layer of flexible, resilient, spongy, foamed polystyrene sheet face-to-face with, but not physically or chemically bonded over its contacting area to, one or more layers of a different resilient or yieldable material, the whole being provided with at least one surface covering layer of woven fabric.  The flexible, resilient polystyrene sheet may be produced by moulding preformed beads of foamed or expanded polystyrene into a block which is then cut into sheets by a knife so as not to seal the surfaces and render them brittle.  The sheets are then passed several times through rollers whilst having a continuous jet of steam directed on to their surfaces.  The polystyrene sheet is associated with a different material such as foamed plastics, e.g. polyurethane, woven woollen fabric or compressed felt, the layers being secured together by adhesive tape at their edges and/or stitching along spaced parallel lines, or quilting.  Both sides may have an outer covering layer, e.g. a cotton fabric on one or both sides, or a cotton fabric on one side and a synthetic resin film (e.g. of polyvinyl chloride) on the other side.  The outer layers may be sewn together at their edges to form a removable or non-removable casing.  The polystyrene layer should be placed adjacent the source of heat to be retained (save only for a thin covering layer).ALSO:A heat-retaining or insulating means for personal or domestic use, such as a blanket, pad, garment which may be a therapeutic pad, seat cover, footwear insole, glove, or tea-cosy, comprises a layer of flexible, resilient, spongy, foamed polystyrene sheet face-to-face with but not physically or chemically bonded over its contacting area to, one or more layers of a different resilient or yieldable material, the whole being provided with at least one surface covering layer of woven fabric.  The flexible, resilient polystyrene sheet may be produced by moulding pre-formed beads of foamed or expanded polystyrene into a block which is then cut into sheets by a knife so as not to seal the surfaces and render them brittle.  The sheets are then passed several times through rollers whilst having a continuous jet of steam directed on to their surfaces.  The polystyrene sheet is associated with a different material such as foamed plastics, woven woollen fabric or compressed felt, the layers being secured together by adhesive tape at their edge and/or stitching along spaced parallel lines, or quilting.  Both sides may have an outer covering layer, e.g. a cotton fabric on one or both sides, or a cotton fabric on one side and a synthetic resin film (e.g. of polyvinyl chloride) on the other side.  In the case of a pad or blanket, for example, the outer layers may be sewn together at their edges to form a removable or non-removable casing.  The polystyrene layer should be placed adjacent the source of heat to be retained (save only for a thin covering layer).  A pad or blanket may comprise one or two polystyrene layers 1/8 -1 inch thick, and adjacent thereto or sandwiched therebetween, one polyurethane wadding-like layer 1/8 -2 inch thick secured together at their edges by adhesive tape and enclosed in a casing comprising on one side a sheet of polyvinyl chloride the edges of which are turned over the edges of the inner layers and on the other side a sheet of cotton of variegated colour and/or pattern the edges of which are turned over the edges of the polyvinyl chloride sheet, all the layers then edge stitched together.  The assembly may also be stitched along spaced parallel lines or quilted.  Folded securing tapes may be sewn to each corner.