| 摘要 |
PURPOSE:To obtain a highly-reliable gum-molded heater having heat-resisting, watertight and adhesive properties by molding in a multiple manner the open-end part of a metal pipe containing a heater therein by the use of several different kinds of gum. CONSTITUTION:The open-end part of a metal pipe 2 containing a heater 3 therein is molded in a multiple manner by several different kinds of gum. It is advisable, for instance, to use the less-water-permeable butyl gum as the stuff for inner mold 1 and the chloroprene gum with excellent adhesiveness and incombustibility as the stuff for outer mold 6. |
