Injection Molding Machine Specifications
Comprehensive technical parameters and specifications for high-performance injection molding equipment, including an excellent injection molding machine for sale that meets industry standards.
Understanding the technical specifications of an injection molding machine is crucial for selecting the right equipment for your manufacturing needs. Whether you're looking for a standard model or a specialized injection molding machine for sale, knowing the key parameters ensures optimal performance and product quality.
This detailed guide covers all essential technical conditions, parameters, and standard equipment features of modern injection molding machines, providing valuable insights for anyone considering an injection molding machine for sale.
Key Technical Parameters
| Parameter | Description | Typical Range |
|---|---|---|
| Screw Diameter | Outer diameter of the injection screw | 12mm - 200mm |
| Theoretical Shot Volume | Maximum volume of material that can be injected in one cycle | 16cm³ - 40,000cm³ |
| Shot Weight (PS) | Weight of polystyrene that can be injected (density 1.05g/cm³) | 15g - 38,000g |
| Injection Pressure | Pressure applied to melt in the barrel during injection | 70MPa - 250MPa |
| Injection Stroke | Maximum distance the screw travels during injection | 100mm - 1000mm |
| Screw Speed | Rotational speed of the screw during plasticization | 0 - 300 rpm |
| Barrel Heating Power | Total power of heating elements in the barrel | 2kW - 100kW |
| Clamping Force | Maximum force applied to keep mold closed during injection | 50kN - 50,000kN |
| Tie Bar Spacing (H×V) | Distance between tie bars (horizontal × vertical) | 200×200mm - 2000×2000mm |
| Maximum/Minimum Mold Thickness | Range of acceptable mold thicknesses | 50-300mm to 200-1500mm |
| Mold Opening Stroke | Maximum distance between moving and fixed platens when open | 150mm - 2000mm |
| Maximum Daylight Opening | Maximum distance between platens when fully open | 300mm - 3500mm |
| Ejector Stroke | Maximum distance the ejector system travels | 50mm - 300mm |
| Ejector Force | Maximum force exerted by the ejector system | 5kN - 100kN |
| Number of Ejector Pins | Quantity of hydraulic ejector pins | 2 - 12 |
| Hydraulic Pump Motor Power | Power rating of the hydraulic system motor | 3kW - 150kW |
| Oil Tank Capacity | Volume of the hydraulic oil reservoir | 50L - 2000L |
| Machine Dimensions (L×W×H) | Overall dimensions of the machine | 2×1×1.5m to 10×5×4m |
| Machine Weight | Total weight of the machine | 1000kg - 100,000kg |
| Minimum Mold Size (L×W) | Smallest mold that can be accommodated | 100×100mm to 500×500mm |
| Platen Parallelism | Precision of platen alignment under full clamping force | 0.05mm/m to 0.1mm/m |
When searching for an injection molding machine for sale, these parameters serve as critical selection criteria to match production requirements.
Modern Injection Molding Technology
Today's injection molding machines feature advanced controls, precision engineering, and energy-efficient operation. Whether you're producing small components or large parts, finding the right injection molding machine for sale requires understanding how these technical specifications translate to real-world performance.
The integration of computerized controls with hydraulic or electric systems has revolutionized the industry, providing unprecedented accuracy and repeatability. This makes selecting an appropriate injection molding machine for sale more important than ever to ensure product quality and manufacturing efficiency.
Detailed Parameter Explanations
Screw Length to Diameter Ratio (L/D)
The screw length to diameter ratio, expressed as L/D, represents the ratio between the effective length of the screw's threaded portion and the outer diameter of the injection screw. This critical parameter significantly influences the plasticizing capability and melt quality of the machine.
Typical L/D ratios range from 18:1 to 24:1 for general purpose machines, with specialized applications requiring ratios outside this range. A higher L/D ratio generally provides better plasticization and mixing, which is essential for materials requiring extensive melting or homogeneous mixing of additives. When evaluating an injection molding machine for sale, considering the appropriate L/D ratio for your specific materials is crucial.
Modern designs often feature barrier screws with optimized L/D ratios to handle a wide range of materials efficiently. This versatility makes a properly specified injection molding machine for sale a valuable asset in diverse production environments.
Shot Volume
Shot volume, also known as injection capacity or maximum shot volume, refers to the maximum volume of material that an injection molding machine can inject in a single cycle under no-load conditions. This parameter defines the machine's processing capability and indicates the maximum size of plastic parts it can produce. When searching for an injection molding machine for sale, understanding the shot volume requirements of your products is essential.
Shot volume is typically expressed in two ways: as the mass (in grams) of polystyrene (with a density of 1.05g/cm³) that can be injected, or as the volume (in cm³) of the molten material. In China, injection molding machine standards specify shot volume in cubic centimeters (cm³).
Standard shot volumes include: 16cm³, 25cm³, 40cm³, 63cm³, 100cm³, 160cm³, 200cm³, 250cm³, 320cm³, 400cm³, 500cm³, 630cm³, 800cm³, 1000cm³, 1250cm³, 1600cm³, 2000cm³, 2500cm³, 3200cm³, 4000cm³, 5000cm³, 6300cm³, 8000cm³, 10000cm³, 16000cm³, 25000cm³, and 40000cm³. Selecting an injection molding machine for sale with the appropriate shot volume ensures efficient production without excessive material waste or insufficient capacity.
It's generally recommended that the actual shot volume for a part should be between 30% and 70% of the machine's maximum shot volume for optimal performance. This range ensures proper plasticization while maintaining cycle efficiency, a key consideration when evaluating any injection molding machine for sale.
Injection Speed
Injection speed refers to the linear velocity of the screw or plunger during the injection phase, typically measured in millimeters per second (mm/s). This parameter directly affects how quickly molten plastic fills the mold cavity, which in turn impacts part quality, surface finish, and cycle time. When evaluating an injection molding machine for sale, considering the required injection speeds for your specific parts is crucial.
Injection rate, another related parameter, represents the maximum volume of material that can be injected per unit time, calculated as the product of the screw or plunger cross-sectional area and its forward velocity, expressed in cubic centimeters per second (cm³/s). High-speed injection is particularly important for thin-walled parts that require rapid filling to prevent premature cooling.
Injection time refers to the duration of the injection phase, from the start of screw advancement to the completion of cavity filling. This time is dependent on both the injection speed and the part volume. Modern machines offer precise control over injection speed profiles, allowing for multi-stage injection with varying speeds in different phases of the filling process.
When selecting an injection molding machine for sale, it's important to match the machine's maximum injection speed capabilities with the requirements of your parts. Typical injection speeds range from 50mm/s to 300mm/s for standard machines, with specialized high-speed machines offering velocities exceeding 500mm/s for demanding applications.
Injection Pressure
Injection pressure is the force applied to the molten plastic in the barrel's cross-sectional area during the injection phase. This pressure is essential to overcome the resistance of molten plastic flow through the nozzle, runner system, and into the mold cavity. When searching for an injection molding machine for sale, ensuring adequate injection pressure for your specific materials and part designs is critical.
The selection of appropriate injection pressure depends on several factors, including the plastic material's viscosity, plasticization method, melt temperature, mold temperature, flow resistance within the mold, and the part's geometry and dimensional requirements. Higher viscosity materials generally require higher injection pressures to ensure proper filling.
Injection pressure is a primary factor influencing part quality, as insufficient pressure can result in incomplete filling, while excessive pressure may cause flash, increased residual stress, or mold damage. Modern injection molding machines offer precise pressure control, often with multi-stage pressure profiles to optimize the filling and packing phases.
Typical injection pressures range from 70MPa to 250MPa (approximately 10,000 to 36,000 psi) for most thermoplastic materials. Specialized applications, such as micro-molding or engineering resins with high viscosity, may require pressures exceeding 300MPa. When evaluating an injection molding machine for sale, it's important to consider not just the maximum pressure, but also the machine's ability to maintain stable pressure control throughout the injection cycle.
Plasticizing Capacity
Plasticizing capacity refers to the amount of material that an injection molding machine can melt and prepare for injection within one hour. This parameter is typically specified using polystyrene as a reference material, as it represents a medium difficulty material to plasticize. When considering an injection molding machine for sale, ensuring sufficient plasticizing capacity for your production requirements is essential for maintaining efficient cycle times.
The plasticizing system must consistently provide a sufficient quantity of uniformly melted material within the required cycle time. Proper plasticization ensures that the molten material has uniform temperature and viscosity, which is critical for consistent part quality and dimensional stability.
Plasticizing capacity is influenced by several factors, including screw design, L/D ratio, screw speed, barrel heating capacity, and the thermal properties of the material being processed. Different materials require different plasticizing conditions; for example, engineering resins often require higher temperatures and longer plasticizing times compared to commodity plastics.
When evaluating an injection molding machine for sale, the plasticizing capacity must match or exceed the required injection volume multiplied by the number of cycles per hour. A general rule of thumb is that the plasticizing capacity should be 1.5 to 2 times the maximum required hourly output to account for variations in material and processing conditions. This ensures that the machine can maintain consistent production without being limited by plasticizing capabilities.
Injection Unit Thrust
Injection unit thrust, measured in kilonewtons (kN), is the force provided by the injection unit's hydraulic cylinder to press the injection nozzle against the mold's sprue bushing. This force is essential to create a proper seal that prevents molten plastic from leaking at the nozzle-mold interface during injection and packing phases. When selecting an injection molding machine for sale, ensuring adequate injection unit thrust is vital for maintaining process integrity.
The required thrust depends on several factors, including the injection pressure, the cross-sectional area of the nozzle, and the material's viscosity and processing temperature. Higher injection pressures require greater thrust to maintain a proper seal. As a general guideline, the injection unit thrust should be sufficient to create a contact pressure of at least 10-15 MPa at the nozzle-mold interface.
In addition to adequate thrust, proper sealing also depends on the design and dimensions of both the nozzle and the sprue bushing. These components must be carefully matched to ensure uniform contact pressure and effective sealing.
Injection unit thrust typically ranges from 5kN for small machines to over 200kN for large machines. When evaluating an injection molding machine for sale, it's important to ensure that the thrust capability is appropriate for the intended materials and processing conditions. Insufficient thrust can lead to material leakage, known as "drooling," which causes material waste, cycle disruptions, and potential mold damage.
Modern injection molding machines often feature adjustable injection unit thrust to accommodate different mold designs and processing requirements, adding versatility to the equipment. This flexibility is an important consideration when choosing an injection molding machine for sale that will handle a variety of production needs.
Key Considerations When Selecting Equipment
Production Requirements
Match the machine's capabilities with your specific production needs, including part size, material type, and production volume. An appropriately sized injection molding machine for sale will optimize both quality and efficiency.
Energy Efficiency
Modern machines offer significant energy savings compared to older models. Look for an injection molding machine for sale with variable frequency drives, servo motors, and efficient hydraulic systems to reduce operational costs.
Control Systems
Advanced control systems provide better process repeatability and easier operation. When evaluating an injection molding machine for sale, consider the user interface, programming capabilities, and data collection features.
The right injection molding machine for sale will balance technical capabilities with production needs, providing a reliable platform for manufacturing high-quality plastic components efficiently and cost-effectively.
Ready to Find Your Perfect Machine?
Understanding these technical specifications is the first step toward selecting the ideal injection molding machine for sale that meets your production requirements. Whether you need a small machine for precision parts or a large system for high-volume production, the right equipment will enhance your manufacturing capabilities.
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