A film blowing exhaust device for a blow molding machine

Abstract

The invention discloses a film blowing and air discharging device of a plastic blowing machine. The film blowing and air discharging device comprises an air discharging pipe of which one end extends into a film opening of a film blowing machine, wherein the other end of the air discharging pipe is arranged outside the film opening of the film blowing machine; one section of the other end of the air discharging pipe is inserted into a sleeve; the sleeve is connected with an air discharging opening of an air compressor or an air storage tank at the insertion end of the air discharging pipe; the other end of the sleeve is inserted into a water tank; a cam for driving the air discharging pipe to vibrate is arranged near to a pipeline, which is positioned outside the film opening, of the air discharging pipe and is connected with an output shaft of a driving motor. The sleeve in the film blowing and air discharging device of the plastic blowing machine is sleeved at the end part of the air discharging pipe according to a siphon theory in the physics, so that the air flow amount in the same air flow direction as the discharged air is increased, and negative pressure is formed at a port of the air discharging pipe; therefore, the air discharging power of the air discharging pipe is improved and can discharge pasty colloid attached to the inner wall of the air discharging pipe out of the air discharging pipe, and the pasty colloid is difficultly deposited on the pipe wall.

Description

technical field [0001] The invention relates to a structure of a blow molding machine, in particular to a film blowing exhaust device of the blow molding machine. Background technique [0002] The plastic film blowing machine heats plastic particles through a plastic extruder and extrudes them into the film mouth, then blows air to the lower end of the film mouth to form air bubbles, and then cools the air bubbles through a cooling device to form a tube film. Yet the temperature of its inner surface of the film after cooling is still higher, and its inner surface is easily stuck after the tube film is wound. Therefore, lubricating powder needs to be added in the blowing process, and the gas containing lubricating powder needs to be discharged through the exhaust pipe. The temperature of the gas containing lubricating powder decreases gradually after it is discharged. Since the discharged gas contains moisture in addition to the lubricant, the moisture is changed into moistu...

AI Technical Summary

Problems solved by technology

At present, the continuous production time of plastic foam blowing is generally about 5 hours, which not only affects production efficiency but also increases labor intensity.

Images