Combined taper superposition die head of film blowing machine

Abstract

The invention relates to a combined taper superimposing die head of a film blowing machine. The die head comprises a gas pipe, a core rod, a plurality of runner seats, a die core nozzle and a die lipring, wherein the runner seats are sequentially stacked outside the core rod from bottom to top, and each comprises an upper runner seat and a lower runner sea; the upper runner seat comprises a firstouter ring and a first inner ring, the lower runner seat comprises a second outer ring and a second inner ring, the upper runner seat is provided with a feeding port, a transverse runner and a firstlongitudinal runner, a first annular runner is formed between the lower surface of the first inner ring and the upper surface of the second outer ring, a second longitudinal runner is formed in the outer end of the second outer ring, and a second annular runner is formed between the lower surface of the second outer ring and the upper surface of the first inner ring at the lower runner seat; and ataper spiral runner is formed between the inner surfaces of the first inner ring and second inner ring and the outer surface of the second inner ring at the upper runner seat. The length of the plasticized runner is greatly extended, the plasticizing time of the molten plastic is prolonged, and the plasticization of the molten plastic is more uniform, thereby greatly improving the quality of an extrusion film.

Description

technical field [0001] The invention relates to a die head, in particular to a combined tapered superimposed die head of a film blowing machine. Background technique [0002] The film blowing machine is a device that heats and melts plastic particles and blows them into films. Its main working process is: after the material is plasticized by the extruder, it is extruded into a film tube through a die head, then cooled by an air ring and a water ring, and then introduced into a traction roller for clamping after being stabilized, folded and flattened, and finally Film products with good strength, toughness, opening, moisture resistance, transparency and thermoplasticity are produced by winding machine. [0003] In order to form a multi-layer film at one time, a die head composed of multiple flow channel seats is usually used. The specific structure generally includes air pipes, mandrels, multiple flow channel seats, core nozzles and lip rings. The air pipes are set on the ma...

AI Technical Summary

Problems solved by technology

[0004] Since the above-mentioned die head adopts a bottom-to-top superimposed structure of multiple flow channel seats, due to the limitation of the overall structure, the spiral flow channel on the lower flow channel seat plus the total length of the corresponding secondary flow channel, that is, the plasticizing flow of the lower layer The length of the channel is shorter, and gradually decreases from top to bottom according to the level, which causes the plasticizing time of the molten plastic in the lower layer to be shorter, and the plasticizing time of each layer of molten plastic flowing into the main channel is uneven, resulting in extrusion. The quality of the film is poor

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