Rotary traction blown film production process

Abstract

A rotary traction blown film production process, in the process of rotary traction, the rotational speed of the bidirectional motor gradually decreases with the increase of the angle between the center axis of the fourth horizontal movable guide roller and the reference direction, and the speed of the bidirectional motor The rotation speed increases with the decrease of the included angle value; when the included angle value is zero, the rotation speed of the bidirectional motor reaches the maximum value; The angle between them depends on the output wind speed of the variable frequency fan at each moment. The invention can alleviate the problem of film being scratched and stretched, and make the film roll obtained by final winding more compact and have more orderly edges.

Description

technical field [0001] The invention belongs to the technical field of plastic film production technology, and in particular relates to a rotary traction blown film production technology. Background technique [0002] When the traditional film blowing machine is produced, the plastic raw material is melted and extruded from the circular extrusion port of the die head to form a cylindrical film bubble, and then the traction nip roll flattens the film bubble into a double-layer film, and the double-layer film bypasses The guide roller is fixed horizontally, and finally the rewinding shaft is used for rewinding. The installation direction of the horizontally fixed guide roller is parallel to the central axis of the rewinding shaft. [0003] However, due to mechanical design, mechanical structure, mechanical processing and other reasons, the thickness of each point of the cylindrical film bubble extruded from the circular extrusion port of the blown film equipment is actually di...

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Problems solved by technology

On the other hand, the above-mentioned twisting process belongs to the back and forth rotation, and when the special motor suddenly changes direction (commutation for short), the film is more likely to be strained

[0009] In order to reduce the degree of the above-mentioned strain or scratch, people design the second horizontal movable guide roller, the third horizontal movable guide roller, and the fourth horizontal movable guide roller as air cushion rollers. There is a fan that sends air to the air-cushion roller. When each horizontal movable guide roller is continuously twisting back and forth around the circular extrusion port, the fan continuously sends air to the air-cushion roller, so that the second horizontal movable guide roller and the third horizontal movable The surface of the guide roller and the fourth horizontal movable guide roller forms an air cushion layer. However, the angle changes continuously during the rotation and traction process, so that the tension of the film will more or less produce a component force along the axial direction of the horizontal guide roller. In addition, due to the air cushion layer, the film will continue to break away from the surface of the second horizontal movable guide roller, the third horizontal movable guide roller, and the fourth horizontal movable guide roller, so the film is easy to move along the second horizontal movable guide roller, the third horizontal movable guide roller, the fourth horizontal movable guide roller The axial direction of the horizontal movable guide roller drifts, and it has not been flattened (flattened along the axis of the guide roller), so that the final film roll is not dense and the edges are not neat (commonly known as "swing edge ")

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