Extrusion die for producing high molecular weight polyethylene sheet material with breadth between 500 and 2,000mm

Abstract

The invention provides an extrusion die for producing a high molecular weight polyethylene sheet material with a breadth between 500 and 2,000mm, which comprises guiding feeding channel structure main bodies 1, guiding feeding channels 2, adjustment monitoring valves 3, a die group 4, an interflowing body 5, dendritic channels 6 and adjustment plunger valves 7, wherein the guiding feeding channel structure main bodies are arrayed side by side; a plurality of extruders feed to the main bodies 1 respectively; a plurality of channels 2 are arranged in each main body 1; the channels are dispersed at the feed inlet of each main body 1 and are communicated with the die group 4 at the channel discharge end; the paths of the channels are independent mutually and are not communicated with each other; one adjustment monitoring valve 3 is arranged in each channel 2; the diameter of the adjustment monitoring valve is between 16 and 36mm; the die group 4 consists of the interflowing body 5 and a plurality of dendritic channels 6; the dendritic channels 6 are dispersed at the feed inlet of the die group 4 and are communicated with the interflowing body 5 at the channel discharge end; one adjustment plunger valve 7 is arranged in each dendritic channel 6; and the diameter of the adjustment plunger valves is between 9 and 26mm.

Description

technical field [0001] The invention relates to an extrusion die for producing ultra-high molecular weight polyethylene wide sheets. Background technique [0002] One of the important factors in plastic sheet extrusion is the supply of materials. For the extrusion molding of 500-2000mm wide ultra-high molecular weight polyethylene sheet, sufficient melt accumulation and sufficient melt pressure are necessary conditions for molding. Due to the low melt fluidity of ultra-high molecular weight polyethylene, a huge amount of material accumulation is required when producing wide-width sheets, and the conventional feeding method cannot meet the huge amount of propulsion; on the other hand, due to the Affected by a variety of forces, the melt pressure state of the material has changed dramatically, and the pressure of the material at the fusion point at the end of the mold has dropped significantly, making it difficult for the melt to fuse well, and even causing the material to fa...

AI Technical Summary

Problems solved by technology

[0004] Due to the simultaneous feeding of one or more extruders, the feeding volume and initial pressure are greatly increased, sufficient feeding volume and front-end pressure of the mold are ensured, and the feeding structure is divided into interconnected guide feeding channel structures , which greatly reduces the pressure loss caused by the system being too large, and overcomes the defect of poor fluidity of the ultra-high molecular weight polyethylene material melt

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