Film blowing machine for heat shrink film production

Abstract

The invention provides a film blowing machine for heat shrink film production. The film blowing machine comprises a feed hopper, an extrusion cylinder, a screw assembly, a driving motor and a die head, the extrusion cylinder comprises a cylinder body, a first end cover and a second end cover; the screw assembly comprises a central rotating shaft, a first material conveying sleeve, a melting reinforcing sleeve, a second material conveying sleeve and a sealing sleeve; the first material conveying sleeve, the melting reinforcing sleeve, the second material conveying sleeve and the sealing sleeve which rotate along with the central rotating shaft are sequentially connected outside the central rotating shaft in a sleeving manner in the axial direction, the sealing sleeve is rotatably connected in a step groove in one side of a second sealing cover, and an end plate used for abutting against the end part of the central rotating shaft is arranged at the end part of the sealing sleeve; and a containing groove formed in the axial direction is further formed in the center of the center rotating shaft, a heating part stretching into the containing groove for heating is fixed in the second end cover, and spiral blades are further arranged outside the first material conveying sleeve, the melting reinforcing sleeve and the second material conveying sleeve. The heating and melting efficiency of plastic particles in the extrusion cylinder can be greatly improved, the uniformity effect of the melted materials can be improved, and meanwhile the maintenance cost is low.

Description

technical field [0001] The invention relates to a film blowing machine, in particular to a film blowing machine for heat shrinkable film production. Background technique [0002] The film blowing machine is to heat and melt the plastic particles and then blow them into a film, and then use the blown heat-shrinkable film to wrap the product or package outside. Exhibition and sale, increase the beauty and sense of value; at the same time, the packaged items can be sealed, moisture-proof, pollution-proof, and protect the goods from external impact, with a certain cushioning property; especially when packaging fragile items, it can prevent containers Scatter when broken; In addition, it can reduce the possibility of product dismantling and stealing; It is suitable for tight packaging and tray packaging of multiple items. Shrink film machines are widely used in glass bottles, styrofoam, cartons, toys, electronics, electrical appliances , stationery, books, records, hardware tool...

AI Technical Summary

Problems solved by technology

[0003] However, in the process of melting plastic particles and extruding them, the existing film blowing machines for heat shrinkable film production not only have low heating efficiency, but also the conveying materials in the extrusion cylinder can only be passively returned and transported by the spiral blades. , and when the intake of additives is increased, the uniformity effect is often poor, and once the screw blades are worn, the screw may need to be replaced as a whole, so the maintenance cost is also high

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