Film blowing die head

Abstract

The invention discloses a film blowing die head. The film blowing die head comprises a base, wherein a plurality of feeding holes are formed in the outer side surface of the base; each feeding hole isprovided with two sub-runners in the base in an extending manner; each sub-runner is provided with a discharging hole; a plurality of through holes are formed in the top of the base; each through hole communicates with the corresponding discharging hole; in the vertical direction of the outer side surface of the base, two adjacent feeding holes are distributed in a vertically staggered manner, sothat a plurality of layers of sub-runners which are vertically staggered and do not interfere with each other are formed in the base; each feeding hole is provided with a first sub-runner and a second sub-runner in the base in an extending manner; a first discharging hole and a second discharging hole are respectively formed in one end of each first sub-runner and one end of each second sub-runner; the centers of the first discharging holes and the second discharging holes are respectively M1 and M2; the center of the base is M3; M1, M2 and M3 are positioned on the same horizontal line; the distance between M1 and M3 is L1; the distance between M2 and M3 is L2; and L1 is equal to L2. According to the film blowing die head, the internal space of the base is fully utilized; the base has thecharacteristics of being easy to machine, high in production efficiency and good in rigidity; and due to the symmetry of the runners, the deformation of a die can be reduced, the precision of a product is improved, and the pressure is reduced.

Description

technical field [0001] The invention relates to a plastic pipe extrusion die, in particular to a film blowing die head. Background technique [0002] The traditional extrusion die is equipped with an internal cooling channel on the side of the internal feed port, but due to the limitation of the thickness of the material, the cooling channel cannot be set too large, so the internal feed port is changed to a side feed port, and the mold's The center is provided with the largest cooling channel, such as the structure disclosed in US Patent Document No. US7811073B. [0003] U.S. Patent Document No. US7811073B discloses a multi-melt channel film die head suitable for continuous production of single-layer or multi-layer tubular films made of thermoplastic polymers on 22010.10.12, including a melt supply unit that provides polymer melts , melt inlet opening, at least two melt channels in the form of annular slits, the two melt channels and the central axis of the film die are arr...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a blown film die head with better rigidity, uniform feeding, easy processing, and effectively solve the traditional uneven feeding, so as to overcome the deficiencies in the prior art

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