The principle of injection molding of syringe Th […]
The principle of injection molding of syringe
The principle of injection molding of the perfusion device is to add powder or powdered plastic to the hopper of the injection machine, where the plastic is heated and melted to maintain the flow condition, and then written into a closed mold under a certain pressure and set by cooling After that, the molten plastic solidifies and becomes the required plastic part.
The advantages of the injection molding of the infusion device are that the molding cycle is relatively short, the production power is relatively high, and the automated production is simply completed. It has a wide customary scale and can form plastic parts with messy shapes and accurate scales.
In the preparation before molding, the plastic needs to be preheated and boring to prevent the appearance of the plastic parts from having defects or degradation after molding, which affects the appearance and connotation quality of the plastic parts. When changing the material or changing the product, the cylinder cleaning is required. The injection molding process of the perfusion device includes: feeding, plasticizing, film filling, pressure maintaining and shrinking, cooling and demolding after the gate is frozen. After the injection molding technology of the infuser is completed, post-processing of the plastic parts is carried out. Because the plasticization is uneven or the crystallization, orientation, and cooling and heating of the plastic in the cavity are not uniform, some internal stress inevitably exists inside the plastic part, which then causes the plastic part to deform or crack during use. Therefore, you should find a way eliminate.
At present, with the continuous improvement of relevant laws and regulations in the pharmaceutical industry, the pharmaceutical industry continues to develop steadily. Prefilled syringes occupy an important position in pharmaceutical packaging due to their own characteristics and unique advantages.
Pre-filled syringes need to meet the following three requirements:
1. In order to ensure that the medicine is not damp or deteriorated during the validity period, the pre-filled syringe has good sealing and barrier properties, and can prevent the influence of light, heat, water vapor, oxygen, etc. on the medicine.
2. The inner wall of the tube sleeve of the pre-filled syringe is in direct contact with the drug, and the bottle-making material must meet the requirements of the drug packaging to ensure the safety of the drug.
3. The size and structure of the pre-filled syringes should meet the requirements of the pharmaceutical company's filling machine and the requirements of the high-speed automatic filling machine. Pre-filled syringes have the advantages of light weight, high strength, not easy to break, easy to transport, good sealing performance, moisture resistance, hygiene, and meet the special requirements of drug packaging. An excellent medicinal packaging container.
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