Multi-layer plastic film blowing method

Abstract

The invention discloses a multi-layer plastic film blowing method. The method comprises the steps that S1, hot melt adhesive resin of different materials or colors is subjected to melting treatment; S2, a first film bubble is formed in a molten material under the action of gas output by a die head assembly; S3, an anti-blocking agent solution is sprayed on the inner surface of the first film bubble for the first time, and a first film is formed under the action of a first traction assembly; S4, multi-stage heating is carried out on the first film; S5, the first film is aerated and subjected to secondary blow-up treatment, and the anti-blocking agent solution is sprayed on the inner surface of a second film bubble for the second time; and S6, a second film is subjected to online edge cutting, opening, film separating and winding operation, and waste obtained after edge cutting is recycled through a matched recycling device so that the waste can be rotated into a feeding assembly to be secondarily utilized.

Description

technical field [0001] The invention relates to the field of film production. More specifically, the present invention relates to a method for blown film of multilayer plastic film used in the case of film production. Background technique [0002] The production process of the existing three-layer co-extrusion blown film is mainly to feed the material to the touch head of the blow molding machine through three screws, blow up from the core head to form bubbles with a diameter of 3 meters, extend upwards and cool to form film bubbles, and then pass through The curl extends downward, the middle is planed by a running knife, and then unfolded by a stretcher. After unfolding, the second traction is carried out to complete the roll. [0003] It can be seen that in the existing film blowing process, the film bubble is usually not processed after formation. In order to ensure the ductility of the film, usually only the material ratio and raw materials are improved, and no further ...

AI Technical Summary

Problems solved by technology

[0003] It can be seen that in the existing film blowing process, usually no further processing is done after the bubble is formed, in order to ensure the ductility of the film, usually only the ratio of the material , and the raw materials are improved without further processing, so the mechanical properties of the specific material are not well controllable in ductility and shrinkage, which affects the performance of the product and is not conducive to the production of cross-films. poor adaptability

[0004]At the same time, in order to ensure that a certain layer of film has special performance requirements or colors in the prior art, it is usually necessary to add other functional materials to the main material, but now In some processing methods, the usual operation method is to weigh each material according to its weight, mix it fully through a mixer, and then put it directly into a hopper for transportation. Therefore, during the suction process, there is no guarantee The materials are accurately conveyed according to the ratio requirements, which will affect the quality and performance of the later membrane, so the adaptability is too poor

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