Plastic bottles are generally made from raw materials such as polyethylene, polypropylene or polyester added with corresponding solvents, and then processed by processes such as blow molding, extrusion blow molding or injection molding. The eye drop bottle is no exception as a special pharmaceutical packaging container, and its bottle cap is also an injection molding process.
The injection molding process refers to a process in which molten raw materials are pressurized, injected, cooled, and separated to produce semi-finished parts of a certain shape. The injection molding process of the eye drop bottle cap mainly includes 6 stages: mold clamping-filling-(gas assisted, water assisted) pressure holding-cooling-mold opening-demolding.
The injection molding process can use the injection mold to accurately control the wall thickness distribution of the parison, so that the wall thickness of the resulting container is more uniform, avoiding the thinning phenomenon that is easy to occur in the corner part of the general blow molded product, and the weight of the product can be controlled at + 0.1g, the accuracy of the thread can be controlled within 100μM, the mouth size is accurate, and the narrow neck product has high forming accuracy.
The eye drops bottle cap produced by the injection molding process does not require secondary processing and has no joints, which saves the finishing time of the product, no waste is generated during the processing process, and the waste of molding materials is reduced. However, this process has an impact on the operator The skill requirements are high.
The injection molding process is mainly used for the processing of opening products such as bottle caps and effervescent tubes, but the molds are generally more complicated and suitable for the production of small products.
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