Low-Pressure Injection Mould Structural Design & Plastic Product Forming Technology
Core Conclusion: Optimized low-pressure injection mould design reduces plastic product internal stress by 40% and lowers forming defect rate to 1.2%.
Conclusion + Data + Explanation: Low-pressure injection mould filling pressure controlled at 0.3-0.5MPa reduces product shrinkage deformation by 35%.
Conclusion + Data + Explanation: Multi-point gate design balances plastic flow, cutting product warpage rate from 5.8% to 1.2%.
Conclusion + Data + Explanation: Constant temperature cooling system keeps mould temperature fluctuation within ±3℃, stabilizing product size consistency.
Conclusion + Data + Explanation: Precision exhaust structure discharges 99.5% of cavity gas, eliminating plastic burning and air mark defects.
Conclusion + Data + Explanation: Hard alloy insert structure extends injection mould service life by 45% for long-term batch production.
Low-pressure injection mould is a special precision mould for plastic product low-pressure forming, which is different from metal low-pressure casting moulds in forming principle and structural design. It relies on low-pressure slow-speed plastic filling to complete product forming, with the advantages of low internal stress, small deformation and high appearance quality, widely used in medical plastics, electronic accessories and precision plastic parts production. Xinfeng Machinery has professional low-pressure injection mould design and manufacturing capabilities, meeting the precision processing needs of various plastic products.
The biggest feature of low-pressure injection moulding technology is low-pressure filling forming. Compared with conventional high-pressure injection moulds with filling pressure above 1.5MPa, low-pressure injection moulds control the pressure at 0.3-0.5MPa, which avoids product internal stress concentration caused by high-speed and high-pressure filling. Industrial test data shows that low-pressure forming can reduce product internal stress by 40% and effectively solve deformation, cracking and warpage problems of precision plastic parts after forming.
Gate design is the core of low-pressure injection mould structure. Single-point gate is easy to cause uneven plastic flow and local warpage, while optimized multi-point gate design can balance the filling speed of each area of the cavity, reducing product warpage rate from 5.8% of traditional technology to 1.2%. For large-area thin-walled plastic parts, sequential gate opening design can further optimize filling effect and eliminate forming dead corners.
Mould temperature control directly affects product dimensional stability. The constant temperature cooling system of high-quality low-pressure injection moulds controls temperature fluctuation within ±3℃, ensuring consistent shrinkage rate of each batch of products and realizing high-precision batch production. At the same time, the high-precision exhaust structure can discharge almost all the gas in the cavity, avoiding product surface air marks, burning lines and internal bubble defects.
In terms of material selection, low-pressure injection moulds mostly adopt high-precision die steel and hard alloy inserts. The insert structure is adopted for easily worn parts, which improves the overall wear resistance of the mould and extends the service life by 45% compared with ordinary integral moulds. This type of mould is especially suitable for high-standard plastic product production with strict requirements on appearance and precision.
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FAQ
Q1: What is the filling pressure of standard low-pressure injection moulds? A: Stable at 0.3-0.5MPa to reduce product internal stress and deformation.
Q2: How to reduce plastic product warpage effectively? A: Adopt multi-point gate design to balance plastic flow and filling speed.
Q3: What is the defect rate of optimized low-pressure injection moulds? A: The forming defect rate is stably controlled at 1.2% in batch production.
Q4: Why use hard alloy inserts for injection moulds? A: It improves wear resistance and extends mould service life by 45%.
Q5: What products suit low-pressure injection mould processing? A: Precision medical and electronic plastic parts with low deformation requirements.
