Split-type material storage die head in two-layer two-spiral channel

Abstract

The invention discloses a split-type material storage die head in a two-layer two-spiral channel. In the split-type material storage die head, melt mixing is even, double-layer melt temperature is uniform, temperature loss is small and the die head is contained by two-layer melt, and seam is removed. The split-type material storage die head comprises a die head outer barrel, an upper end cover, a lower end cover, an inner core, an outer core, a centre rod, a flow guide sleeve, a die and a pushing mechanism. The die head is characterized in that a split-flow core sleeve fixedly connected with the upper end cover is mounted on the outer core; a split-flow hole corresponding to a feed hole of the die head outer barrel is formed in the split-flow core sleeve; two outer spiral channels are arranged on the outer core; two inner spiral channels are arranged on the inner core; the starting points of the two outer spiral channels and the starting points of the two inner spiral channels are symmetrically arranged for 180 degrees respectively; two guide channels corresponding to a split-flow cone of the split-flow hole and used for connecting two sides of the split-flow cone with two outer spiral channels on the outer core are arranged on the outer core; and flow guide through holes communicated with the two inner spiral channels on the inner core are respectively formed in the tail ends of the two guide channels.

Description

technical field [0001] The invention belongs to the field of machinery for producing blow-molded products, and in particular relates to a double-layer double-helix flow channel internal split storage die head. Background technique [0002] With the wide application of large-volume (above 200L) blow molding products in petrochemical, railway transportation, storage and other industries, the demand for them is increasing, and the requirements for their quality are also getting higher and higher. The existing material storage die for producing blow molding products has the following problems: 1. The interior of the material storage die is formed by a simple conical double helix structure, and the molten material enters the double layer formed by the inner and outer cores of the mold through the inlet. After the cavity, when the inner and outer mandrels are surrounded, they will meet at one or two places, forming two seams on one side or both sides. The molten material cannot fl...

AI Technical Summary

Problems solved by technology

The existing material storage die for producing blow molding products has the following problems: 1. The interior of the material storage die is formed by a simple conical double helix structure, and the molten material enters the double layer formed by the inner and outer cores of the mold through the inlet. After the cavity, when the inner and outer mandrels are surrounded, they will meet at one or two places, forming two seams on one side or both sides. The molten material cannot flow uniformly at 360°, so it cannot be fully and evenly mixed. Layer seams cannot be staggered, resulting in very low strength at the seams

2. The storage die is equipped with an outer runner, and through the outer runner, the inner and outer double-layer melts are divided, and then enter the inner and outer cavity respectively. The structure of the outer runner makes the inner and outer melts The temperature loss is large and the loss between the two is uneven, resulting in inconsistent temperature of the inner and outer melts, large temperature loss and high energy consumption; inconsistent density, which seriously affects the quality of blow molding products

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