A hot runner mold

Abstract

The invention discloses a hot runner mold. The hot runner mold comprises a runner plate structure and a spray nozzle structure. The runner plate structure is provided with a surface melt runner and a core layer melt runner. A base comprises an outer surface layer melt passageway, a core layer melt passageway and an inner surface layer melt passageway. Surface layer melt enters the surface layer melt passageway and then enters the outer surface layer melt passageway and the inner surface layer melt passageway of the spray nozzle structure through outlets. Core layer melt enters the core layer melt runner and enters the core layer melt passageway of the spray nozzle structure through an outlet. A discharge port of the core layer melt passageway is located between a discharge port of the outer surface layer melt passageway and a discharge port of the inner surface layer melt passageway. A convergence opening is formed by joining the discharge port of the core layer melt passageway, the discharge port of the outer surface layer melt passageway and the discharge port of the inner surface layer melt passageway. The outer surface layer melt, the core layer melt and the inner surface layer met enter the convergence opening at the same time, then enter an inlet of an injection nozzle and can finally be injected into a mold cavity in a layered manner. The hot runner mold is provided with the multiple layers of runners, different types of molten plastic can be injected into the mold cavity at the same time in a layered manner, and different materials can be injected onto a same bottle blank in a layered manner.

Description

technical field [0001] The invention relates to a hot runner mold. Background technique [0002] With the current wide application of PET (Polyethylene terephthalate) bottles in food, beverage and other packaging industries, the requirements for PET bottles are getting higher and higher. PET has the advantages of strong tensile ductility, toughness, not easy to break, not easy to break, and easy to shape. But it also has the disadvantage of poor gas retention. When filling liquid beverages such as milk and beer, CO 2 It is easily reduced, making the shelf life very short. In order to solve this problem, it is necessary to add a layer of material with good barrier properties in the middle of the wall thickness of the bottle. Such as nylon. Before the bottle is formed, it is necessary to add barrier material to the preform and blow the bottle together to ensure the uniformity of wall thickness, ductility and other physical properties. [0003] Compared with ordinary runn...

AI Technical Summary

Problems solved by technology

The product structure is single, and the mechanical and physical properties of the product are poor

And for multi-cavity molds, its disadvantages are more obvious, the flow channel becomes longer, the processing difficulty increases, the injection flow channel resistance is large, and the temperature change of the plastic is large, which makes the product consistency poor, the product physical properties are poor, often have dissatisfaction, color difference, Phenomena such as flash burrs, deformation, material brittleness, and poor toughness

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