TUBE STRUCTURE FOR HOT WATER CIRCULATION IN HEATING MAT

摘要

Heating mat (1) comprises mat substrate (3) having grooves (2) and a resin tube having inside hole (4) through which hot water can be circulated, the resin tube pressed into the grooves. The tube has a multiple tube structure. The first and fifth tube members (9, 13) are formed from a crosslinked polyethylene. The second and fourth tube members (10, 12) are formed from an adhesive resin. The third tube member (11) is formed from polyvinyl alcohol. The crosslinked polyethylene has a low hardness, so that fitting operation thereof can be easily carried out.