Film Blowing Unit

Abstract

The invention relates to a film blowing device, which includes an inner rotary core, a middle rotary core and an outer rotary core. The film blowing device also includes a middle gear, a planetary gear, an inner ring gear and a driving device. Axially fixed on the middle rotating core, the inner ring gear is set coaxially around the middle gear and keeps its position fixed. The planetary gear is arranged between the middle gear and the inner ring gear and meshes with the middle gear and the inner ring gear at the same time. The gear shaft of the gear is pivotally connected to the inner rotary core and the outer rotary core, and the driving device can drive the inner rotary core and the outer rotary core to rotate in the first direction, and make the middle rotary core rotate in accordance with The second direction opposite to the first direction rotates. The film blowing device of the present invention makes the film tend to be isotropic, and does not cause warping problems, even if jumping occurs, it will not affect the uniformity of film thickness, and only a single driving device can drive the whole device.

Description

technical field [0001] The invention relates to the technical field of polymer material processing and molding devices, in particular to a film blowing device. Background technique [0002] Blow molding is the third most commonly used plastic processing method after extrusion molding and injection molding. Among them, film blow molding is to press the viscous liquid melt from the front end of the screw extruder into the die, so that the melt The body is extruded into a tube embryo shape through the die, and the tube embryo is blown evenly and freely into a film with a larger diameter by using the compressed air from the bottom of the die head, and at the same time, the tubular film is stretched longitudinally during the upward pulling process , then flattened by a herringbone plate, pulled by a traction roller, and finally rolled into a tube. [0003] However, when this traditional film blow molding equipment processes plastics with a high degree of orientation, the blown f...

AI Technical Summary

Problems solved by technology

[0005] Based on this, the present invention provides a film blowing device, which effectively overcomes the problem of uneven film thickness while ensuring the isotropy of the film obtained through it.

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