Multi-layer co-injection blow molding method for preparing container and blow molding runner structure of multi-layer co-injection blow molding method

Abstract

According to the multi-layer co-injection blow molding method for preparing the container and the blow molding runner structure of the multi-layer co-injection blow molding method, the multi-runner hot runner is arranged, and the hot runner bears multiple layers of blow molding raw materials; a blow molding opening is formed in one side of the hot runner, blow molding raw materials in the hot runner are received, collected at the blow molding opening and enter a mold for blow molding, a plurality of runners are arranged in the hot runner, the lengths of the runners are different, the material flow velocity difference is formed, the materials flow into the mold after being collected into the blow molding opening, and then blow molding operation is conducted. According to the multi-layer co-injection blow molding method for preparing the container and the blow molding runner structure of the multi-layer co-injection blow molding method, circulation of multiple layers of materials is carried out through the multi-runner plate, so that the circulation time difference of different materials in the runner is enlarged, the cooling time of the formed materials of different layers is different, the blow-molded structures are not the same any more after the materials are collected to a mold, the outer layer flowing time is long, and the blow molding efficiency is improved. The flowing time in the blow molding opening is prolonged, the cooling time is also prolonged, the molding is earlier than that of the inner layer material, and the components of the inner layer material are not influenced.

Description

technical field [0001] The invention relates to a multi-layer co-injection blow molding method for preparing a container and a blow molding runner structure thereof. Background technique [0002] The medicine container is the storage terminal of the medicine, which carries the medicine. Therefore, the container not only has the function of carrying the medicine, but also needs to store the medicine in a sealed manner. Therefore, many bottles need to adopt multi-layer material structures, and the existing technology uses co-extrusion injection molding Multi-layer injection molding is carried out in a multi-layer injection molding method. The multi-layer injection molding raw materials are collected into the mold through the flow channel, and are cooled and formed. In this way, the injection molded container has more burrs, and the multi-layer materials are more molten with each other, which is not suitable for medical pharmaceutical containers. The injection molding process h...

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Problems solved by technology

[0002] The medicine container is the storage terminal of the medicine, which carries the medicine. Therefore, the container not only has the function of carrying the medicine, but also needs to store the medicine in a sealed manner. Therefore, many bottles need to adopt multi-layer material structures, and the existing technology uses co-extrusion injection molding Multi-layer injection molding is carried out in a multi-layer injection molding method. The multi-layer injection molding raw materials are collected into the mold through the flow channel, and are cooled and formed. In this way, the injection molded container has more burrs, and the multi-layer materials are more molten with each other, which is not suitable for medical pharmaceutical containers. The injection molding process has a small application range and is not suitable for small-sized pharmaceutical containers. The pharmaceutical containers are generally molded by blow molding, which can ensure the smooth inner wall of the container. Pooling can cause the inner walls of multiple layers of the container to melt into each other, or form multiple layers that interfere with each other, affecting the final shape

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