B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/760
B29C 47/88 (2006.01) B29C 33/04 (2006.01) B29C 33/76 (2006.01) B29C 35/16 (2006.01)
Patent
CA 1326118
ABSTRACT The invention concerns apparatus for molding thermoplastic tubing, especially ribbed and double walled thermoplastic tubing. In such apparatus a sizing plug, which may be of a cooling plug, is often provided to define the inner wall of the tube. According to the invention a pressured gas is expanded isentropically into the cooling plug through a throttle valve so that the expanding gas cools the plug. Suitably the gas is carbon dioxide which may be vented to the atmosphere. The use of a throttle valve for isentropic expansion of gas to cool the plug, is advantageous at least in that the degree of cooling may be controlled through the degree of throttling of the valve and in that gas may be led into the valve at the temperature of the molding process, rather than through cooling lines which may have localised undesirable cooling effect. The invention also includes providing the plug with a porous outer region for the dissemination of lubricant.
586528
Dennison Associates
Lupke Manfred A. A.
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