Manufacturing device and using method of multi-layer co-extrusion film

By monitoring membrane bubbles with a laser diameter gauge and an infrared thermal imager, and combining PID algorithms and variable frequency fan control, the problems of membrane layer separation and inaccurate diameter control in the manufacturing of multilayer co-extruded membranes have been solved, thereby improving membrane quality and energy efficiency.

CN122165620APending Publication Date: 2026-06-09NANTONG NKODA POLYURETHANE TECH CO LTD
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Patent Information

Application Number
CN202610283970.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-10
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In the existing multilayer co-extruded film manufacturing process, the film layers are prone to separation, and the diameter of the film bubble is not accurately controlled, which leads to film rupture or poor adhesion, affecting film quality and application reliability.

Method used

A laser diameter gauge and an infrared thermal imager are used to monitor the diameter and temperature of the membrane bubble in real time. The frequency of the fan and the opening of the air valve are dynamically adjusted by combining a PID control algorithm. The diameter of the membrane bubble is controlled by a multi-layer co-extrusion die head and a variable frequency fan. Ultrasonic energy is introduced to promote membrane adhesion.

Benefits of technology

It has achieved a membrane bubble diameter control accuracy of ±0.5%, reduced interlayer peeling and melting, improved membrane adhesion strength, reduced energy consumption by 25%, and solved the problems of membrane rupture and poor adhesion in traditional processes.

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Abstract

The invention discloses a manufacturing device of a multi-layer co-extrusion film, which comprises a blowing machine used for extruding a molten plastic material; the multi-layer co-extrusion die head is used for co-extruding melts of different materials into a multi-layer structure; the sensing detection module is used for monitoring the diameter change of the film bubble and the surface cooling state of the film bubble in real time; the control module is used for receiving a sensor signal and outputting an instruction matrix of fan frequency and air valve opening by applying a PID control algorithm; the wind power control module is used for adjusting the wind power according to the instruction matrix of the fan frequency and the air valve opening degree so as to control the diameter of the film bubble; and the film bubble forming module is used for forming the final film. The invention further discloses a using method of the manufacturing device of the multi-layer co-extrusion film. The problems that in the manufacturing process of the multi-layer co-extrusion film, film layers are prone to being separated, and film breakage or poor adhesion is caused by inaccurate control over the diameter of film bubbles are solved.
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