| 摘要 |
An apparatus for the production of a tubular film from thermoplastic material which is thermoplasticized in an upstream extruder. The apparatus includes a die-head, an annular die for the continuous extrusion of a thermoplasticized plastic tube, a device for inflating the plastic tube to a tubular film bubble which is continuously hauled-off, and a cooling air cooling device for internal cooling of the tubular film bubble above the annular die. The cooling air cooling device includes a cooling unit and a circulating unit for the cooling air. The cooling air cooling device has an annular cooling chamber which is provided with a die bottom shaped to conform to the tubular film bubble for the exhaust of the cooling air. The cooling unit includes a heat exchanger with which the circulating unit is combined. The heat exchanger on the one hand is in connection with the interior of the tubular film bubble and is connected on the other hand to a channel system leading to the annular cooling chamber.
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