PROCESS AND MOULD FOR MANUFACTURING THERMAL INSULATORS

The invention relates to a process and mould for manufacturing the thermal insulators for the pipes conveying the heating medium from the thermal stations to the consumers. The process consists in manufacturing a cylindrical insulator body provided with a central bore of the same diameter as the pipe it is to be mounted on, by wrapping a 2 ... 3 mm thick expanded polyurethane protective cloth or some textile material, said cloth being fastened with the fastening nails equipping the inner mould cylinder, followed by closing the lateral sides of the mould and introducing an external expanded polyurethane protective cloth which fits tight the inner side of the lateral walls due to the polyurethane elasticity, and a mixture comprising uniformly comminuted expanded polyurethane waste and polyethylene flakes (a mixture in a ratio of 60 % polyurethane and 40 % polyethylene, the amounts being expressed in units of mass) is introduced into the gap formed between the two cloths, said mixture constituting the core, followed by closing the mould cover and subjecting the mould to a thermal treatment for heating at 150 ... 160 degree C, followed by free cooling, then opening the mould and removing the insulator body therefrom, said insulator body being mountable on the pipe. According to the process, the mould (1) for manufacturing the thermal insulator comprises a support plate having mounted thereon an inner sheet metal cylinder (6), provided with a partitioning wall and an axle with some semicylindrical lateral walls swinging thereon and an upper cover for closing the mould. Inventia se refera la un procedeu si la o matrita pentru realizarea unor izolatori termici, pentru conductele ce transporta agentul termic, de la centrale la beneficiari. Procedeul consta in realizarea unui corp izolator, cilindric, avand o gaura centrala, de diametrul conductei pe care se monteaza, prin infasurarea unei panze de protectie din poliuretan expandat avand o grosime de 2...3 mm sau un material textil, panza care se fixeaza in niste cuie de prindere, cu care este prevazut cilindrul interior al matritei, dupa care se inchid partile laterale ale matritei si se introduce o panza exterioara de protectie, din poliuretan expandat, care se va mula pe interiorul peretilor laterali, datorita proprietatii elastice a poliuretanului, iar in golul format intre cele doua panze, se introduce un amestec din deseuri de poliuretan expandat, maruntit uniform, si fulgi de polietilena (amestec in proporti