Hot-runner mold provided with double layers of runners

Abstract

The invention discloses a hot-runner mold provided with double layers of runners. The mold comprises a runner plate structure, wherein the runner plate structure comprises a transition plate and an air cylinder plate; a first surface-layer runner plate and a first core-layer runner plate are arranged between the transition plate and the air cylinder plate; a first surface-layer melt runner is arranged inside the first surface-layer runner plate; a first core-layer melt runner is arranged inside the first core-layer runner plate; a second surface-layer runner plate and a second core-layer runner plate are further arranged between the transition plate and the air cylinder plate; a second surface-layer melt runner is arranged inside the second surface-layer runner plate; and a second core-layer melt runner is arranged inside the second core-layer runner plate. The mold adopts the design of the double layers of runners, that is, the surface-layer melt runners comprise double layers of runners capable of realizing independent temperature control, and the core-layer melt runners also comprise double layers of runners capable of realizing independent temperature control, so that plastic in different molten states can be injected into a cavity in a layered manner simultaneously, and different materials can be injected on the same bottom preform in a layered manner.

Description

technical field [0001] The invention relates to a hot runner mold, in particular to a hot runner mold with double-layer runners. 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 ot...

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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