Direct-Pressure PET Preform Injection Molding System
The SANTSAI ProPET 400 is engineered for high-volume PET preform production. It combines direct-pressure central clamping, two-stage injection, servo-electric plasticizing, multi-station external cooling and intelligent process monitoring in one integrated production system.
Designed for 96- and 128-cavity mold configurations, the ProPET 400 provides the injection capacity, clamping stability and post-mold cooling performance required for continuous PET preform production.
Direct-Pressure Clamping Unit
The direct-pressure central clamping system applies clamping force evenly across the mold and supports stable, repeatable operation.
A linear-guide structure provides fast and smooth mold movement, while independent high-pressure cylinder support improves clamping stability.
Key features include:
- Direct-pressure central clamping
- Linear-guide mold movement
- Mold movement speed up to 1,000 mm/s
- Clamping-force repeatability of 0.5%
- Independent high-pressure cylinder support
- Optional electric mold opening and closing
- Low-pressure mold protection
- Optional tie-bar pulling device for factories with limited installation height
Two-Stage Injection Unit
The two-stage injection system separates continuous plasticizing from plunger injection. This design supports stable melt preparation, repeatable filling and consistent PET preform quality.
Key features include:
- Independent continuous plasticizing
- Independent plunger injection
- Injection repeatability of 0.1%
- Servo-electric plasticizing
- Energy-efficient barrel heating
- H414 screw with hard-chrome plating
- Reduced black spots
- Easier material cleaning
External Preform Cooling
The ProPET 400 can be equipped with a three- or four-station external preform cooling system. Moving part of the cooling process outside the mold helps reduce in-mold cooling time and supports a shorter production cycle.
The three-axis cooling-plate robot provides a preform take-out speed of up to 5,000 mm/s.
Key features include:
- Three- or four-station external cooling
- Three-axis cooling-plate robot
- Preform take-out speed up to 5,000 mm/s
- Shorter in-mold cooling time
- Automatic coordination with the molding cycle
Servo-Hydraulic Power and Intelligent Control
The high-efficiency servo-hydraulic system provides fast response and stable pressure control. A high-response servo proportional valve supports smooth machine movement and repeatable positioning.
The embedded SPC process monitoring system supports process control, production analysis and quality traceability.
Key features include:
- High-efficiency servo-hydraulic drive
- High-response servo proportional valve
- Positioning repeatability of 0.2 mm
- Low-noise operation
- Embedded SPC process monitoring
- Process control and quality traceability
ProPET 400 Technical Specifications
| Specification | Unit | ProPET 400 |
|---|---|---|
| Screw Diameter | mm | 120 |
| Theoretical Shot Weight | g | 4,630 |
| Clamping Force | t | 420 |
| Clamping Stroke | mm | 700 |
| Mold Thickness | mm | 500–850 |
| Tie-Bar Spacing (H × V) | mm | 930 × 1,020 |
| Maximum Mold Cavities | pcs | 96 / 128 |
| Motor Power | kW | 258.9 |
| Total Installed Power | kW | 403.6 |
| Machine Dimensions (L × W × H) | mm | 9,300 × 4,850 × 2,900 |
Reference Output and Energy Consumption
Reference data based on a 23 g PCO 1881 PET preform with a 96-cavity mold.
| Performance Item | Value |
|---|---|
| Preform Weight | 23 g |
| Number of Cavities | 96 |
| Cycle Time | 9.5 ±0.5 s |
| Theoretical Output | 36,379 pcs/h |
| PET Throughput | 836.7 kg/h |
| Theoretical Daily Capacity | 20 t/day |
| Specific Energy Consumption | 435.7 kWh/t ±5% |
All output and energy-consumption figures are reference values. Actual performance depends on the preform design, resin, mold, cooling system, auxiliary equipment, operating efficiency and process conditions.
Complete PET Preform Production Solution
SANTSAI can configure a complete PET preform production system around the customer’s product and output requirements, including:
- ProPET 400 injection molding system
- Multi-cavity PET preform mold
- Dehumidifying dryer
- Material feeding and conveying system
- Industrial chiller
- Mold cooling system
- External preform cooling robot
- Compressed-air system
- SPC production monitoring
- Preform inspection and downstream handling
Request a Technical Proposal
Please provide the preform drawing, preform weight, neck finish, mold cavities, target cycle time, annual output, resin or rPET ratio, local power supply and factory layout.
SANTSAI will recommend the appropriate machine, mold, cooling and auxiliary-equipment configuration for your project.
