Flat Shoulder Plastic Extrusion Flat Die

Abstract

The invention provides a square shoulder type plastic extrusion flat die head and relates to a sheet material extrusion die head. The square shoulder type plastic extrusion flat die head comprises a first die head assembly and a second die head assembly, wherein an extrusion flow channel is formed between the inner side face of the first die head assembly and the inner side face of the second die head assembly; the extrusion flow channel sequentially comprises a feeding region, a diffusion region, a distribution region and an extrusion region from top to bottom; and the square shoulder type plastic extrusion flat die head is characterized in that the top edge of the diffusion region is a straight-line section; and the top edge of the diffusion region is parallel to a die lip at the bottom end of the square shoulder type plastic extrusion flat die head. The die lip at the bottom end of the square shoulder type plastic extrusion flat die head is the bottom edge of the square shoulder type plastic extrusion flat die head. Compared with the prior art, the square shoulder type plastic extrusion flat die head has the beneficial effects that the structures of the diffusion region and the distribution region of the flat die head are improved so that inner pressure of a flowing smelting body in the die head is more uniform in a transverse direction, and the problem that the die head has clamshell deviation is effectively avoided; and the consistency of the thickness and the physical property of an extruded finished product is good, the slitting and winding effects of the finished product are also very good, and the rejection rate is greatly reduced.

Description

Technical field [0001] The invention relates to a sheet extrusion die, more specifically to a flat-shoulder plastic extrusion flat die. Background technique [0002] In the existing flat extrusion die, the internal flow channel usually includes a feed zone, a diffusion zone, a distribution zone and an extrusion zone, and the entire flow channel is like a coat hanger. However, the existing extrusion flat die head is only suitable for the production of small width sheets. To this end, the applicant improved the existing extrusion flat die head and applied for a patent, its patent number is 201220102959.2, and the name is "wide sheet extrusion flat die head", which includes the first die head Assembly and the second die assembly, an extrusion channel is formed between the inner side of the first die assembly and the inner side of the second die assembly, and the extrusion channel includes a feeding zone, a diffusion zone, The distribution area and the extrusion area are characteri...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the flow channel of the clothes hanger type in the prior art makes the internal pressure of the flowing melt on the die head uneven in the transverse direction, resulting in clamshell deviation in the die head, and the produced product has incomplete thickness in the transverse direction. Consistent shortcomings, provide a flat-shouldered plastic extrusion flat die head, this flat-shouldered plastic extrusion flat die head can make the flowing melt press the die head more uniformly in the lateral direction, and avoid clam shells on the die head The problem of deviation

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