Multi-layer co-extrusion film-blowing die head capable of automatically controlling and stabilizing diameter of female film

Abstract

The invention relates to a multi-layer co-extrusion film-blowing die head capable of automatically controlling and stabilizing the diameter of a female film, which belongs to the technical field of the extrusion film-blowing equipment for production of multi-layer plastic films. The multi-layer co-extrusion film-blowing die head comprises a die body which consists of a multi-layer die head and a finish die, a core rod, a finish die core rod, a flow channel in the die head and an air inlet / exhaust duct, and is characterized in that the die body is provided with an infrared probe facing a female film for detection and an infrared reflecting mirror used for receiving and reflecting infrared rays, the infrared probe is connected with an electromagnetic valve, the electromagnetic valve is connected with an air pump and an air pipe, the air inlet / exhaust duct is connected with the air pipe and an exhaust pipe; the inner wall of the finish die is of a trumpet shape with a smaller upper diameter and a larger lower diameter, and the outer wall of the finish die core rod matched with the finish die is of a trumpet shape with a smaller upper diameter and a larger lower diameter. The invention can automatically adjust, control and stabilize the diameter of the female film, thereby completely preventing the phenomenon of breakage in the secondary expansion of the female film. The diameter of the die head can be reduced significantly, thereby reducing the manufacturing cost; the heat dissipation is reduced, thereby saving the energy, and the roundness of the finish die can be adjusted rapidly and conveniently.

Description

Technical field [0001] The invention belongs to the technical field of extrusion blown film equipment for making multilayer plastic films, and specifically relates to a multilayer co-extrusion blown film die head capable of automatically controlling and stabilizing the diameter of the mother film. Background technique [0002] The multi-layer superimposed die head, or multi-layer co-extrusion blown film die head, one of the existing extrusion blown film equipment for making multi-layer plastic films, cannot be used for the diameter of the primary mother film during the production process. Monitoring, so that the circle diameter of the mother film often changes, the existence of this defect directly affects the secondary expansion of the mother film, and the reduction of the circle diameter of the mother film will affect the quality of the second expansion of the mother film; the circle diameter of the mother film changes Larger, the mother film will break and become waste film du...

AI Technical Summary

Problems solved by technology

But this technical scheme is that the bolt (7) acts on the metal block (4), and each metal block (4) is not connected, so it is necessary to adjust the roundness of the die opening by adjusting all the metal blocks (4) , such an operation is not only labor-intensive and time-consuming, but also difficult to adjust

Another disadvantage of the existing multi-layer co-extrusion blown film die head is that the diameter of the parent film at the multi-layer superposition die is the same as the diameter of the parent film at the die outlet, so the entire die diameter is large. Not only the materials are expensive, but also the entire surface area is large, so the heat dissipation is fast and the energy consumption is large

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