Heated air delivery pipe of plastic stretch blowing machine

Abstract

A heated air delivery pipe of a plastic stretch blowing machine comprises an air delivery pipe with one end connected with an air storage tank and the other end connected with an air blowing valve. The heated air delivery pipe is characterized in that an electric heating device is arranged outside the wall of the air delivery pipe and used for heating the air delivery pipe and air in the air delivery pipe. The air pressurized by an air compressor enters the air storage tank, the air storage tank is connected with the air delivery pipe, the air in the air delivery pipe is blown into a plastic bottle pipe by the aid of the air blowing valve and an air blowing pipe, and the plastic bottle pipe is blown to form a plastic bottle. In order to meet the need of machining a thin-wall plastic container and lead the air blown into the bottle pipe to be hot air, the electric heating device is arranged outside a section of the air delivery pipe and used for heating the air delivery pipe and the compressed air in the air delivery pipe.

Description

technical field [0001] The invention relates to a heated air pipe for a plastic stretch blowing machine, which belongs to the field of plastic machinery. Background technique [0002] PET and other polyesters are used as raw materials to produce hollow plastic containers such as mineral water bottles and oil bottles through injection stretch blowing. In the process of processing, the plastic raw materials are first processed into bottle tubes, and then the bottle tubes are heated. Machine stretch blow molding, the stretch blow molding includes a stretch rod driven by the lifting mechanism, sealing cylinder and blowing system, when the heated bottle tube is placed in the mold, the stretch rod is inserted into the bottle tube , the sealing cylinder is closed to the bottle tube mouth, but the sealing cylinder has a blowing port, the compressed air of the blowing system is blown into the bottle tube, on the one hand, the stretch rod stretches the bottle tube, and on the other ha...

AI Technical Summary

Problems solved by technology

The processed plastic bottle tube is heated by a heater, and the air blown into the bottle is at normal temperature, which varies in height with the change of the ambient temperature. Finally, the plasticity of the inner wall surface will be reduced, the blow length ratio of the bottle is only 1:3.8, the stretch ratio is only 1:2.5, and white spots are prone to appear after blow molding, which has little effect on thick-walled containers, but for thin-walled containers Wall containers, especially retractable plastic containers, such as Chinese patent ZL200920115852.x, special containers such as "disposable self-priming drinking bucket", cannot be blown according to normal temperature air, and cannot meet the ideal product requirements

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