Physical testing index of perfusion device

Update:11 Nov 2020

The infusion device is mainly used for the packaging an […]

The infusion device is mainly used for the packaging and storage of high-end drugs, which can reduce the waste of drugs due to the adsorption of the storage and transfer process, especially for expensive biochemical preparations. Avoid repeated suction after using the diluent to reduce the chance of secondary pollution. It is more accurate than medical staff's manual suction of liquid medicine. At present, the world's annual demand for infusion devices is nearly 2 billion.


The increase in the use of infusion devices has attracted more and more manufacturers and prompted them to optimize production processes to improve production efficiency and reduce production costs; however, under the premise of rapid development, we must also pay attention to the product quality of infusion devices.


The infusion device is widely used because of its convenient and quick use, no pollution in the whole process, and cost saving. Manufacturers are also paying attention to the physical testing indicators of the perfusion device while continuously improving the process and increasing production efficiency. The slidability of the rubber piston of the infusion device is one of them. The piston uses the push rod to generate resistance during the travel of the inner wall of the glass needle tube, and detects its use and starts to push the push rod. At a certain speed (drug speed), push the piston to the bottom of the needle tube to stop. (Dose completion) The force value produced during the process. In actual use, too much force will cause difficulty in injection, and too little force will cause dangerous injections too fast or too much.


Comparison of injection blow molding and extrusion blow molding


The difference between extrusion blow molding and injection blow molding is that in injection molding, the mold used for molding must include a male mold and a female mold. The plastic melt is injected into the mold cavity by the injection machine under high pressure. When opening the cavity, the male mold must be removed from the female mold. In extrusion blow molding, an extruder head is used for molding. The blow mold is mainly composed of two halves of a female mold. Generally, a male mold is not needed, and the parison is blown with compressed air.


The characteristics of extrusion blow molding Compared with extrusion blow molding, the characteristics of extrusion blow molding are:


1. Blow molding can form products with very thin wall thickness, which cannot be molded by injection. Blow molding can form products with complex, irregular and integral shapes. When using injection blow molding, after producing two or more pieces, they must be combined together by buckle fitting, solvent bonding or ultrasonic welding.


2. The molecular weight of blow molding grade plastics (such as PE) is much higher than that of injection molding grade plastics. In this way, blow molded products have high impact toughness and high environmental stress cracking resistance, which is very beneficial to the production of large-volume plastics.


3. Since the blow mold is only composed of a female mold, the wall thickness can be changed by simply adjusting the gap between the die orifice of the die or the extrusion conditions, which is very advantageous for products that cannot accurately calculate the required wall thickness in advance. For injection molding, the cost of changing the product wall thickness is much higher.

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