| 摘要 |
<p>In a pipe insulating jacket comprising a hollow cylinder made of a soft foamed material and an outer sleeve with abutting edges parallel to the axis of the pipe, the improvement wherein the outer sleeve is formed by a metal foil carrying a heat-softenable coating on its inside, the inside of the metal foil being bonded throughout to the surface of the soft foamed material and in proximity to the abutting edges being welded to itself along its upwardly bent edges. Advantageously the foam is closed-cell crosslinked polyethylene of a bulk density of about 30 kg/m3, the coating is unfoamed uncrosslinked polyethylene about 30 mu thick, and the metal foil is an aluminum foil about 18 mu thick carrying on its outside a foil of heat-softenable polyester about 5 to 20 mu thick.</p> |
