Horizontal injection molding machine ProPET 400

servo-hydraulicservo-electricfor PET

Overview
The SANTSAI ProPET 400 is a direct-pressure PET preform injection molding system engineered for high-volume PET preform production. It is designed for 96- and 128-cavity molds and integrates direct-pressure central clamping, two-stage injection, servo-electric plasticizing, multi-station external preform cooling and embedded SPC process monitoring to deliver stable, repeatable and efficient PET preform production.

Main capabilities

• Direct-pressure central clamping with linear-guide mold movement for even clamping force and fast, smooth mold action
• Two-stage injection: independent continuous plasticizing plus independent plunger injection for stable melt preparation and repeatable filling
• External preform cooling (three- or four-station) with a three-axis cooling-plate robot to reduce in‑mold cooling time and shorten cycle
• High-speed preform handling with preform take-out speeds up to 5,000 mm/s
• High-efficiency servo-hydraulic drive with high-response servo proportional valve for smooth motion and precise pressure/position control
• Embedded SPC process monitoring for production analysis, process control and quality traceability
• Designed for multi-cavity molds (96 / 128) to support high theoretical outputs

Direct-Pressure Clamping Unit — Key features

• 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/closing
• Low-pressure mold protection
• Optional tie-bar pulling device for limited installation height

Two-Stage Injection Unit — Key features

• 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 and easier material cleaning

External Preform Cooling — Key features

• Three- or four-station external cooling options
• 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 — Key features

• High-efficiency servo-hydraulic drive
• High-response servo proportional valve
• Positioning repeatability of 0.2 mm
• Low-noise operation
• Embedded SPC process monitoring for process control, production analysis and traceability

Complete PET Preform Production Solution

• ProPET 400 injection molding system
• Multi-cavity PET preform mold (96 / 128 cavities)
• 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

Technical specifications (selected)
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 = 23 g PCO 1881 preform, 96-cavity)
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%

Notes
All output and energy-consumption figures are reference values; actual performance depends on preform design, resin (or rPET ratio), mold, cooling system, auxiliary equipment, operating efficiency and process conditions.