Handpiece body of three-layer coextrusion film blowing unit

Abstract

The invention relates to a handpiece body of a three-layer coextrusion film blowing unit. The handpiece body of the three-layer coextrusion film blowing unit comprises a spiral body, an inner die head, a middle die head, an outer die head, a mouth die and a pressing plate, wherein the spiral body, the inner die head, the middle head, the outer die head, the mouth die and the pressing plate are orderly distributed from left to right along the length direction, the spiral body is arranged in the middle of the handpiece body, and comprises two parts which are a vertical portion and an extension portion, the lower portion of the extension portion outwardly extends, a first spiral slot is arranged on the outer wall of the vertical portion, an axial connecting hole is inwardly arranged on the lower end of the vertical portion of the spiral body, and a first feeding channel is inwardly arranged on the top end of the axial connecting hole in the axial direction. The handpiece body of the three-layer coextrusion film blowing unit can achieve to process composite packing films such as low-density polyethylene (LDPE), high-density polyethylene (HDPE), linear low density polyethylene (LLDPE), ethylene vinyl acetate (EVA) and the like, is beneficial for high speed composite, uses multiple colors to print, and is excellent in composite effect, high in product quality, convenient in maintenance and repair and long in service life.

Description

technical field [0001] The invention relates to mechanical processing equipment, in particular to a machine head body of a three-layer co-extruded film blowing unit. Background technique [0002] The head of a multi-layer co-extrusion blown film machine usually includes a mandrel, an outer die, an inner die, an extrusion sleeve and an inlet die. There are blowing passages connected between the mandrel and the inner die. A discharge channel is provided between the outgoing die head and the internal die head. However, in the existing multi-layer co-extrusion film blowing machine head, the extrusion sleeve is provided with a certain number, and the extrusion material of the several number The axial direction of the mandrel is sequentially stacked on the outside of the mandrel, and the die head is correspondingly arranged on the outside of the extrusion sleeve. In this scheme, each layer of film material is compounded in a layer-by-layer manner. The channel lengths of the layer...

AI Technical Summary

Problems solved by technology

[0002] The head of a multi-layer co-extrusion blown film machine usually includes a mandrel, an outer die, an inner die, an extrusion sleeve and an inlet die. There are blowing passages connected between the mandrel and the inner die. A discharge channel is provided between the outgoing die head and the internal die head. However, in the existing multi-layer co-extrusion film blowing machine head, the extrusion sleeve is provided with a certain number, and the extrusion material of the several number The axial direction of the mandrel is sequentially stacked on the outside of the mandrel, and the die head is correspondingly arranged on the outside of the extrusion sleeve. In this scheme, each layer of film material is compounded in a layer-by-layer manner. The channel lengths of the layers of film materials are quite different, which makes the distribution of film materials in each layer difficult to be uniform, and each extrusion sleeve is assembled layer by layer in the axial direction of the mandrel, which has the disadvantage of cumbersome assembly.

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