100ton-1680ton FHG Servo Motor Injection Molding Machine - High Efficiency from China Suppliers & Factory
Injection Unit
Injection Unit
Injection Unit — View 01
Injection Unit — View 02
Frequently Asked Questions
What is an Injection Unit in injection molding machines?
The injection unit is the core component responsible for melting plastic material and injecting it into the mold cavity under high pressure. It typically consists of a hopper, barrel, screw, and nozzle working together to deliver precise shots of molten material.
What are the key performance indicators of an injection unit?
Key indicators include injection pressure, injection speed, shot size (capacity), screw diameter, and plasticizing capacity. These parameters determine the machine's suitability for specific materials and product requirements.
How does the screw design affect injection unit performance?
The screw geometry — including its length-to-diameter (L/D) ratio, compression ratio, and flight depth — directly impacts plasticizing efficiency, melt homogeneity, and the ability to process different polymer types. Specialized screws are available for engineering plastics, elastomers, and other materials.
What maintenance does an injection unit require?
Regular maintenance includes cleaning the barrel and screw to prevent material degradation buildup, inspecting the check valve for wear, lubricating moving components, and monitoring temperature control systems. Scheduled preventive maintenance extends the service life of the injection unit significantly.
Can the injection unit be customized for different plastic materials?
Yes. Injection units can be configured with different barrel and screw materials (such as bi-metallic or hardened steel), special coatings, and varied screw geometries to handle a wide range of thermoplastics, including glass-filled, flame-retardant, and high-viscosity engineering resins.
How do I choose the right injection unit size for my application?
Selecting the right injection unit involves evaluating the part weight and volume, required injection pressure, material flow characteristics, and cycle time demands. It is recommended to consult with the machine manufacturer to match the unit's shot capacity and plasticizing rate to your specific production needs.