China PVC Injection Molding Machine 100ton-800ton - Trusted Suppliers & Factory for High-Quality Production
🔩
01 Injection Unit
Injection Unit — View 1
Injection Unit — View 2
Injection Unit — View 3
❓
Frequently Asked Questions
Q
What is the function of the injection unit in an injection molding machine?
The injection unit is responsible for melting the raw plastic material and injecting it into the mold cavity under high pressure. It consists of a hopper, barrel, screw, and nozzle, working together to deliver precise amounts of molten material with consistent quality.
Q
What materials can the injection unit process?
The injection unit is compatible with a wide range of thermoplastic materials, including PP, PE, ABS, PC, PVC, Nylon, and engineering-grade plastics. The screw and barrel design can be customized to suit specific material properties such as viscosity and processing temperature.
Q
How is injection pressure controlled in the injection unit?
Injection pressure is precisely controlled through a closed-loop hydraulic or servo-electric system. Operators can set and monitor parameters via the machine's control panel, ensuring consistent fill pressure, hold pressure, and back pressure throughout each cycle.
Q
What maintenance is required for the injection unit?
Regular maintenance includes cleaning the screw and barrel to prevent material degradation buildup, inspecting and lubricating moving parts, checking the nozzle tip for wear, and monitoring heater bands for consistent temperature. Scheduled preventive maintenance ensures longer service life and optimal performance.
Q
Can the injection unit be customized for special applications?
Yes. The injection unit can be configured with different screw L/D ratios, barrier screws, mixing elements, or specialized coatings to meet requirements for high-temperature materials, color mixing, or fiber-reinforced plastics. Custom options are available based on production needs.
Q
What are the key performance indicators for evaluating an injection unit?
Key performance indicators include shot weight capacity (g/oz), injection rate (cm³/s), maximum injection pressure (MPa/psi), screw diameter (mm), and plasticizing capacity (kg/h). These parameters determine the unit's suitability for specific product sizes, materials, and production volumes.