High-strength PVC blow molding die head

Abstract

The invention relates to a high-strength PVC blow molding die head. The die head is composed of a feeding device, a runner flange, an outer die lower body, a flow dividing cone, a flow dividing comb, a woven flow divider, an outer die upper body, a die core, an adjusting ring, a pressing ring and other parts. A conveyed cylindrical melt is converted into annular fluid to be conveyed through the flow dividing cone, the melt and the like in the annular flow channel can be divided into an inner fluid and an outer fluid to be converged into the upper woven flow divider, the inner annular melt and the outer annular melt separated by the flow dividing comb are evenly divided into multiple paths of spiral fluid again through the woven flow divider, and each paths of internal and external rotating fluid is mutually woven in the flow channel structure of the woven flow divider, and a PVC melt subjected to flow dividing, weaving and confluence continuously flows upwards along a main flow channel. The phenomena of material combining lines and fusion lines during confluence of a traditional PVC die head are eliminated, a high-strength PVC film with uniform thickness, high strength and good glossiness and the like is obtained, and the application requirements of the modern film field can be met.

Description

technical field [0001] The invention relates to the technical field of blow molding equipment, in particular to a PVC blow molding die head. Background technique [0002] Due to the limitation of the internal flow channel of the existing PVC blowing die, the blown PVC film has compound lines and fusion lines at the die outlet, which cannot guarantee the uniform thickness and smooth operation of the PVC film blowing process. In addition, when the folding diameter of the die head is large, due to the disadvantages of PVC itself such as poor thermal stability, poor fluidity and poor plasticizing effect, the strength of the blown PVC film is low, which cannot meet the requirements of modern PVC films. for its high-intensity applications. Contents of the invention [0003] The present invention provides a PVC blow molding die head structure, which solves one or more of the above background technical problems. [0004] In order to achieve the above object, the present inventio...

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Problems solved by technology

[0002] Due to the limitation of the internal flow channel of the existing PVC blowing die, the blown PVC film has compound lines and fusion lines at the exit of the die, which cannot guarantee the uniform thickness and smooth operation of the PVC film blowing process.

In addition, when the folding diameter of the die head is large, due to the disadvantages of PVC itself such as poor thermal stability, poor fluidity and poor plasticizing effect, the strength of the blown PVC film is low, which cannot meet the requirements of modern PVC films. For its high-intensity application requirements

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