| 摘要 |
<p>PURPOSE:To cool the surface of film at its forming by a method wherein cold air is obtained by reusing the waste heat from the heaters of the stock melting zone, of which an extruder consists, as the driving energy source of an absorption- refrigerator. CONSTITUTION:Stock in an extruder 20 is melted in the cylinder 21 with heaters and fed in a die 27. The heat of the heaters is given through heat exchangers 28 to the hot water 32 of an enclosed hot water circulating circuit 31. The hot water 32 flows in a heating pipe 50 so as to heat silica gel Si in the chamber 38 of an absorption-refrigerator 37. The silica gel Si desorbs steam, which flows in a condensing chamber 42 and is condensed with a steam condenser tube 62 and finally falls down to a cold water chamber 41 in water drops. The silica gel Si in a chamber 39 dissipates heat to the cooling water in an endothermic pipe 59, resulting in lowering its temperature. The steam in the cold water chamber 41 is transferred into a steam chamber 45 so as to be adsorbed by the silica gel Si. Accordingly, the temperature of the water in the cold water chamber 41 lowers and, as a result, the cold water in a cold water circuit is cooled and consequently the air 70, which is sucked with a blower fan 69, is cooled through a heat exchanger 66 and blasted through an air directing ring 72 against the surface of film F.</p> |
