Injection molding process --- pressure
The pressure in the injection molding process includes plasticizing pressure and injection pressure, which are related to the quality of plasticizing and molding
1. Plasticizing pressure:
The pressure on the melt at the top of the screw when the screw rotates and retreats, also known as back pressure. The size of the back pressure has an effect on the actual temperature of the melt,
The plasticizing efficiency, molding cycle, and the degree of uniform mixing of the warehouse materials all have an impact, generally at 160PSI, and generally rarely higher than 200PSI.
2. Injection pressure
The pressure exerted by the top of the screw on the plastic, the maximum pressure is generally around 1900PSI, and its function is to overcome the plastic flow filling
The flow resistance in the process makes the melt have a certain filling rate and compacts the melt. The injection pressure in the compaction stage is called
Hold pressure. The level of holding pressure directly affects the density, shrinkage and mechanical properties of the bottle cap. The holding pressure is generally 1000-1400PSI.
Injection molding process - time (or cycle is generally around T=5 seconds)
Packaging, storage and use of bottle caps:
⑴, packaging
In a clean and dust-proof environment, use plastic bags that meet food safety and hygiene in cartons, and pack them in prescribed quantities.
And paste the product certificate at the designated position of the packing box.
⑵, storage
Products should be stored in ventilated, dry, odorless, non-toxic and harmless warehouses. The storage period shall not exceed half a year. overtake
If the storage period has passed, it must be re-tested before it can be used.
⑶, use requirements
The brittleness of bottle caps (especially PP caps) increases at low temperatures. When the temperature of the bottle cap storage warehouse is lower than 18°C, the
The bottle cap must be placed in an environment with a temperature higher than 18°C for 24 hours.
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