Production process of plastic paste syringes

There are various production processes for veterinary drug packaging, such as injection molding, extrusion blowing, and injection stretch blowing. The veterinary syringe consists of a sleeve, a push rod, a piston, a protective cap, and a positioning ring. So what is its production process?

paste syringe

The veterinary paste syringe is produced by injection molding process, one-time molding, no waste, accurate product size, uniform weight. The production process is as follows:
1. The filling stage
Filling is the first step in the entire injection cycle process. The time starts from when the mold is closed and the injection is started until the mold cavity is filled to about 95%. In theory, the shorter the filling time, the higher the molding efficiency, but in practice, the molding time or injection speed is restricted by many conditions.
2. Pressure holding stage
The function of the holding pressure stage is to continuously apply pressure, compact the melt, and increase the density of the plastic to compensate for the shrinkage behavior of the plastic. During the pressure holding process, the back pressure is relatively high because the mold cavity has been filled with plastic. In the later stage of pressure holding, the material density continues to increase, and the plastic is gradually formed. The pressure holding stage should continue until the gate is solidified and sealed. At this time, the cavity pressure in the pressure holding stage reaches the highest value.
3. Cooling stage
In the injection molding mold, the design of the cooling system is very important. This is because the molded plastic product can only be cooled and solidified to a certain rigidity, and then the plastic product can be prevented from being deformed due to external force after being demolded. Since the cooling time accounts for about 70-80% of the entire molding cycle, a well-designed cooling system can greatly shorten the molding time, improve injection molding productivity, and reduce costs.
4. Demoulding stage
Demoulding is the last link in an injection molding cycle. There are two main ways of demolding: ejector rod demoulding and stripping board demolding. When designing the mold, it is necessary to select an appropriate demolding method according to the structural characteristics of the prefilled syringe to ensure the quality of the product.
The above is the production process of veterinary paste syringes. Any link of filling, holding pressure, cooling and demoulding cannot be ignored. Only by controlling the various production processes can high-quality products be produced.