Connection structure of multilayer coextrusion die bodies used for preparing heat shrinking films

Abstract

The invention relates to a connection structure of multilayer coextrusion die bodies used for preparing heat shrinking films. According to the invention, an upper layer of die bodies, a middle layer of a die body and a lower layer of die bodies are sequentially superposed to from a whole; through holes are provided in same parts of a plurality of die bodies at the upper layer and the lower layer; threaded blind holes are provided in same parts of the upper surface and the lower surface of the die body at the middle layer; an upper screw passes through the through holes in the plurality of die bodies at the upper layer, the lower end of the upper screw is connected with a threaded blind hole in the upper surface of the die body at the middle layer, and the upper end of the upper screw is locked by an upper locknut; a lower screw passes through the through holes in the plurality of die bodies at the lower layer, the upper end of the lower screw is connected with a threaded blind hole in the lower surface of the die body at the middle layer, and the lower end of the lower screw is locked by a lower locknut. The upper and lower short screws are respectively connected with the middle die body from two directions, one from top while the other from bottom; therefore, the length of a single screw is reduced, connection strength among all the die bodies is greatly improved, swelling amount of the single screw under the condition of heating is reduced, faying faces between each layer are tight, and leakage of materials in a die is avoided.

Description

technical field [0001] The invention relates to a multi-layer co-extrusion heat-shrinkable film production equipment, in particular to a connection structure of a multi-layer co-extrusion die body used for preparing the heat-shrinkable film. Background technique [0002] Heat-shrinkable high-barrier food packaging film is mainly used in the packaging of cold fresh meat and seafood. [0003] At present, there are many types of heat shrinkable film forming molds on the market. When assembling the multi-layer mold body, a single screw is used to connect it. When it is produced at high temperature, its use effect is not ideal, the screw is easy to be damaged, and the mold layer is easy to leak material, resulting in Production interruption seriously affects the stability of equipment. [0004] How to connect multi-layer molds in a simple and easy way is a technical problem faced by the industry at present. Therefore, it is imminent to improve the existing mold connection method...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many types of heat shrinkable film forming molds on the market. When assembling the multi-layer mold body, a single screw is used to connect it. When it is produced at high temperature, its use effect is not ideal, the screw is easy to be damaged, and the mold layer is easy to leak material, resulting in Production interruption, seriously affecting the stability of equipment

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