COOLING DEVICE FOR A BLOW EXTRUDER

摘要

A blow extruder for producing hoses made of plastic material has, at the outlet of its nozzle arrangement for producing hoses, a cooling air nozzle ring which encompasses hoses exiting from the nozzle arrangement and to which air is delivered from a blower. An apparatus for cooling air delivered to the cooling air nozzle ring includes a direct evaporator provided with a refrigeration plant and arranged between the blower and the cooling air nozzle ring. The direct evaporator includes a plate fin element and an injection device for a cooling agent and hot air. The cooling apparatus further includes a regulation device for controlling the temperature of the cooling air by controlling operation of the cooling apparatus.