Casting die head with novel structure

Abstract

The invention discloses a casting die head with a novel structure. The casting die head comprises a die head seat, wherein a feeding die opening is formed in the top of the die head seat; a discharging die opening is formed in the bottom of the die head seat, and the discharging die opening is of a long-strip-hole structure extending left and right; a multi-stage runner communicating the feeding die opening with the discharging die opening is formed in the die head seat, the multi-stage runner is of a runner structure with more than two stages which are sequentially arranged from top to bottom, and comprises a first-stage runner communicating with the feeding die opening and a last-stage runner communicating with the discharging die opening; wherein the previous stage of runner is divided into two parts to form the next stage of runner with opposite directions; and the last stage of runner communicates with the discharging die opening through a gradually-changed narrow and flat runner extending left and right, and the last stage of runner is a cavity runner with a small upper part and a large lower part. The extrusion pressure of melt in the die head can be changed more easily, the requirements for equal pressure drop and isochronism are met, the uniformity of the melt is improved, the uniformity of a thin film extruded and formed by the discharging die opening is effectively improved, and the thickness deviation is reduced.

Description

technical field [0001] The invention relates to a flow-casting die head, in particular to a new-type flow-casting die head. Background technique [0002] The casting die is the core molding part of the casting film production equipment. Its function is to make the plastic melt from the extruder be well distributed in the flow channel of the die, so that it can be uniformly extruded from the die at a certain speed, and passed through The cooling roll is cooled and formed to obtain a film product with uniform thickness. [0003] However, there are still some deficiencies in the existing casting dies. The first is that the runner distributes the melt not uniform enough; the second is that the equal pressure drop cannot be fully satisfied; The time spent in the die is equal). The above deficiencies will lead to the unsatisfactory uniformity of the extruded and formed film, especially the film with a thickness of 0.1-0.3mm, resulting in waste of materials. Therefore, it needs ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new type of structural casting die, to solve one or more technical problems in the prior art, at least provide a beneficial choice or create conditions

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