Plastic blown film compounding and manufacturing method

Abstract

The invention discloses a plastic blown film compounding and manufacturing method which comprises the following steps: performing melt extrusion on plastic raw materials by virtue of an extrusion unit, and allowing the raw materials to enter a co-extrusion die head; extruding the melted materials from the co-extrusion die head, performing air inflation, upwards pulling and cooling to form film bubbles, exhausting the film bubbles by virtue of a cooling traction device, and cooling and flattening by virtue of a flattening roller to obtain film; trimming, separating the film into two pieces, performing hot-pressing on each film and a base film unwound by a composite unwinding device by virtue of a composite hot-pressing system, and laminating the film and base film to form a composite film; and winding the finished composite film by virtue of a slitting and winding system. According to the method disclosed by the invention, an adhesive is not adopted, use of a solvent can be effectively avoided, the manufacturing process is simple, and the compound fastness is high.

Description

Technical field [0001] The invention relates to a composite manufacturing method of plastic film blown film. Background technique [0002] At present, in the existing technology, the main film production process is the inflation method; the film composite methods mainly include the following three: extrusion composite, dry composite with solvent adhesive, and composite without solvent adhesive. [0003] The cost of the extrusion compounding method is high, and the thickness of the extruded layer is also limited by the amount of extrusion. At the same time, the energy consumption is high due to the need to melt and extrude the bonding layer. A large amount of solvent discharged during the drying process of solvent adhesive dry composite process will pollute the environment and waste resources; the organic solvent remaining in the composite film will pollute the packaged material during use; drying and maturation consume a lot of energy. When the solvent-free adhesive is compounded ...

AI Technical Summary

Problems solved by technology

[0003] The extrusion compounding method is costly, and the thickness of the extruded layer is also limited by the amount of extrusion. At the same time, due to the need to melt and extrude the adhesive layer, the energy consumption is high

A large amount of solvent discharged during drying of solvent-based adhesive dry composite process will pollute the environment and waste resources; organic solvents remaining in the composite film will pollute the packaged objects during use; drying and curing consume a lot of energy

Solvent-free adhesives are easy to cause quality problems such as composite tunnels due to low initial adhesion when compounding, the compounding fastness is not high, and the compounding equipment is complicated and the investment is high