Transfusion plastic bottle double-color combined cover and injection mold thereof

Abstract

The invention relates to a transfusion plastic bottle double-color combined cover and an exhaust structure of an injection mold thereof, aims to solve the technical problem that air trapping is caused by disorderly flowing of an elastomer body in an injection molding process of the double-color combined cover, and belongs to the technical field of injection molding of medical transfusion plastic bottle double-color combined covers. The transfusion plastic bottle double-color combined cover is characterized in that a central shaft is used as a circle center of the upper part of the elastomer body, a plurality of water stopping grooves which are equally distributed uniformly are formed in a position near the periphery of the elastomer body, reinforcing ribs which are connected with a combined cover body are placed among the water stopping grooves, and space between each water stopping groove and a liquid isolating film and space between each water stopping groove and the inner side wall of an upper cavity are filled with an elastomer body (TPE) material; and in the injection mold of the double-color combined cover, an insert is in sleeve connection with a heat nozzle sleeve, water stopping ribs are placed on a surface, which is connected with the elastomer body, of the insert, the overall dimension of each water stopping rib is matched with the dimensional of a cavity of the corresponding water stopping groove in the elastomer body, and the water stopping ribs and the water stopping grooves not only guide the injection molding elastomer body material to flow orderly, but also guide air in the upper cavity to be discharged from air discharge grooves of an inner side surface and an outer side surface of the insert of the injection mold.

Description

technical field [0001] The invention relates to a two-color combination cap, in particular to a two-color combination cap for a plastic infusion bottle and an exhaust structure of an injection mold thereof, belonging to the technical field of injection molding of a two-color combination cap for a plastic transfusion bottle. Background technique [0002] Medical infusion is one of the important varieties in the pharmaceutical industry, and the plasticization of the packaging of infusion products has become a mainstream trend. The upper cavity of the conventional two-color combination cover is built with TPE elastomer, and the inner side of the lower cavity is connected with the infusion port of the infusion package. The upper cavity and lower cavity of the combination cover are connected up and down to form the combination cover body. ) and elastomer (TPE material) can be molded by one shot. Two-color injection molding simplifies the process steps, reduces the production cos...

AI Technical Summary

Problems solved by technology

However, during the injection molding process of the product, the disordered flow of the elastomer (TPE) body makes the air in the cavity of the elastomer (TPE) body (6) unable to be discharged smoothly, and there is a hidden danger of air trapping

The trapped two-color combination cap will have the following phenomena due to the influence of heat expansion and contraction after high temperature sterilization: it is easy to cause the body of the elastomer (TPE) to separate from the body of the combination cap (PP), and cannot form a whole; When the body is infused, or the elastic body sinks, the elastic body breaks through the arc diaphragm with the resin needle, and falls into the PP material combination cover body; or when the resin needle is pulled out, the elastic body and the resin needle together The PP composite cover body is separated, resulting in liquid leakage

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