A hot runner mold with double-layer runners

Abstract

The invention discloses a hot runner mold with double-layer runners, which includes a runner plate structure; the runner plate structure includes a transition plate and a cylinder plate; a first The surface layer flow channel plate and the first core layer flow channel plate; the inside of the first surface layer flow channel plate is provided with the first surface layer melt flow channel; the first core layer flow channel plate is provided with the first core layer melt material flow channel; A second surface layer flow channel plate and a second core layer flow channel plate are provided between the transition plate and the cylinder plate; a second surface layer molten material flow channel is provided in the second surface layer flow channel plate; the second core layer flow channel plate The channel plate is provided with a second core melt flow channel. The present invention adopts a double-layer flow channel design, that is, the surface melt flow channel is provided with a double-layer flow channel that can realize independent temperature control; the core layer melt flow channel is also provided with a double-layer flow channel that can realize independent temperature control, which can simultaneously Different molten plastics are injected into the cavity layer by layer, so that different materials can be injected layer by layer on the same preform.

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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