Extrusion compound device and technology for high-peeling-strength glue-free composite material

Abstract

The invention discloses an extrusion compound device and technology for a high-peeling-strength glue-free composite material. A base material unreeling device, a polarization treatment device, a compound device body, a reeling device, a co-extrusion extruder and a carrier wave energy guiding device are included. The base material unreeling device, the polarization treatment device, the compound device body and the reeling device are sequentially arranged in the base material conveying direction. The co-extrusion extruder is arranged above the compound device body. A compound area is formed inthe compound device body. An activation area is formed between a die head of the co-extrusion extruder and the compound device body and located above the compound area, and the carrier wave energy guiding device is arranged in the activation area. A base material is subjected to surface polarization treatment through the polarization treatment device, an extruded extrusion film is subjected to activation treatment through the carrier wave energy guiding device, and then the base material and the extrusion film are compounded in the compound device body and finally conveyed to the reeling device to be reeled. Through the extrusion compound device and technology, the high-peeling-strength composite film not containing glue can be prepared, environment friendliness is achieved, toxicity is avoided, and a large number of high-peeling-strength composite films not containing glue can be applied to the food and medicine packaging industry.

Description

technical field [0001] The invention relates to the technical field of manufacturing plastic flexible packaging materials, in particular to an extrusion compounding equipment and process of high peel strength glue-free composite materials. Background technique [0002] In the plastic flexible packaging industry, in traditional packaging materials, in order to have a higher peel strength between the film layers in the packaging material, glue is generally added between the film layers to make them bond together. However, in the actual production process, the solvent in these glues volatilizes and releases toxic substances such as VOC, and due to the good compatibility between the organic solvent and the adhesive, it is difficult for the organic solvent to completely volatilize, so that part of it remains in the final product. When packaging materials are used in food and drug packaging, there is a risk of residual organic solvents migrating to the packaging contents, which wi...

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Problems solved by technology

However, in practical applications, the peel strength of the packaging materials produced by this method is low, and it is often difficult to achieve the ideal state.

[0004] In order to improve the peel strength of the composite packaging material, there are currently two treatment methods: the first is to increase the temperature of the die head, the higher the temperature of the extruded resin when it reaches the composite place, the better the fluidity, and the substrate The better the bonding effect, the higher the peel strength; but in this treatment method, the stability of temperature is difficult to control. When the temperature is too low, the peel strength cannot be improved. Decomposition, it is difficult to form a film or even burnt, resulting in waste products. Therefore, the yield of this processing method is very low

The other is to increase the distance between the extrusion die and the composite roll, that is, to increase the height of the air gap L1, which is equivalent to increasing the oxidation distance. The molten resin is fully oxidized in contact with oxygen in the air at high temperature, resulting in partial polarity group, which is beneficial to the adhesion with the base material and improves the peel strength of the composite material; on the contrary, if the air gap height is too small, the oxidation time is short and the oxidation is insufficient, resulting in low peel strength of the composite material; however, if the air gap The gap height is too large, because the thickness of the extruded resin film is very thin, generally no more than 0.015mm, the cooling rate is too fast, which limits the degree of oxidation reaction, so when this method is used for processing, the peel strength of the composite packaging material is not only Difficult to rise, but will produce a phenomenon of decline

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