Complete Product Introduction

1. Product Overview: 4-Station Precision Molding System

The YC-ISBM-4S series represents a significant advancement in injection stretch blow molding technology, incorporating an independent temperature conditioning/pre-blow station beyond traditional three-station designs. This 90° indexed four-station configuration enables unprecedented control over preform temperature gradients and initial shape formation, making it ideal for applications demanding exceptional container clarity, wall thickness uniformity, mechanical properties, and aesthetic quality.

The core advantage of the four-station system lies in its enhanced process control capability. Through dedicated thermal preprocessing, the machine creates optimal stretch blow conditions for various materials and designs, producing plastic containers with superior consistency and performance. Featuring all-servo drive systems, intelligent temperature control, and modular design, it provides customers with a flexible, efficient, and reliable integrated molding solution.

2. Core Technical Advantages

2.1 Optimized Four-Station Design

• 90° Precision Indexing: Rotary table indexes 90° for accurate four-station positioning
• Independent Temperature Station: Second station dedicated to preform temperature adjustment and pre-blow
• Process Separation: Each operation independently controlled, eliminating interference
• Cycle Time Optimization: Balanced four-station design maximizes equipment utilization

2.2 Intelligent Temperature Conditioning/Pre-Blow System (Core Technology of Station 2)

• Multi-Zone Infrared Heating: 8-12 independently controlled infrared heaters
• Temperature Gradient Control: Independent axial and radial temperature adjustment, ±1.5°C control
• Pre-Blow Forming: Low-pressure pre-blow (2-8bar) for preliminary forming and material distribution optimization
• Online Temperature Monitoring: Infrared temperature sensors for closed-loop control
• Adaptive Temperature Algorithm: Automatic parameter adjustment based on material, environment, mold

2.3 Precision Injection System (Station 1)

• Sumitomo (Japan) or Demag (Germany) injection unit
• Closed-loop injection pressure control, ±0.3% accuracy
• Hot runner technology reduces runner waste
• Bottle neck threads formed in single operation to DIN standards
• Multi-point wall thickness control optimizes material distribution

2.4 High-Precision Stretch Blow Molding (Station 3)

• Servo motor-driven stretch rod with programmable speed curves
• Two-stage pressure control: pre-blow + high-pressure blowing
• Blow pressure up to 40bar for high-strength containers
• Stretch position and speed sensors for real-time feedback control
• In-mold pressure monitoring ensures molding quality

2.5 Efficient Ejection System (Station 4)

• Servo-driven ejection mechanism with adjustable speed
• Multi-point multi-stage ejection prevents container deformation
• Optional robot or conveyor automatic part removal
• Automatic counting and defect separation
• Quick mold change system

2.6 All-Servo Drive System

• Table indexing: Servo motor drive, ±0.03° positioning accuracy
• Clamping mechanism: Servo-electric or servo-hydraulic, 40% energy saving
• Injection unit: Servo motor-driven screw, ±0.2% metering accuracy
• Stretch mechanism: Servo control, ±0.1mm speed and position accuracy

2.7 Intelligent Control System

• Siemens S7-1500/TIA Portal fully integrated automation
• 15-inch multi-touch screen with graphical interface
• Recipe management: 100 sets of process parameter storage
• Data traceability: Complete production records and quality tracking
• Remote monitoring & maintenance: IoT connectivity support

3. Four-Station Process Detailed Explanation

Station 1: Precision Injection Molding Plastic pellets are dried and dehumidified before entering the injection unit. Under precise temperature control, material is uniformly plasticized and injected into the mold cavity via screw, forming preforms with accurate neck threads and optimized wall thickness distribution.

Key Technical Parameters:

• Injection speed: 50-300mm/s (multi-stage adjustable)
• Holding pressure: 30-80MPa
• Cooling time: 3-10 seconds
• Neck dimension accuracy: ±0.02mm

Quality Control Points:

1. Preform weight stability: CV value <1.5%
2. Wall thickness uniformity: Critical area thickness variation <5%
3. Crystallinity control: Ensures optimal stretch performance
4. Appearance quality: No bubbles, no splay marks, no contaminants

Station 2: Temperature Conditioning/Pre-Blow (Core Advantage of 4-Station) Preforms rotate 90° to the temperature conditioning/pre-blow station. This unique design allows precise temperature adjustment and preliminary forming before stretch blowing.

Temperature System Features:

• Multi-Zone Heating Control: Independent heating of preform sections creates optimal temperature gradients
• Temperature Uniformity: Combined hot air circulation and infrared radiation heating
• Fast Response: Adjustable heating power for different material requirements
• Energy Efficient Design: Heat recovery system reduces energy loss

Pre-Blow Technical Advantages:

1. Shape Pre-Forming: Low-pressure air provides preliminary expansion, optimizing material distribution
2. Stress Relief: Releases residual injection stresses, improves final container strength
3. Temperature Equalization: Air flow promotes preform temperature uniformity
4. Quality Prediction: Pre-blow process can detect potential defects early

Process Parameter Ranges:

• Heating temperature: 80-120°C (material dependent)
• Heating time: 2-8 seconds adjustable
• Pre-blow pressure: 2-8bar
• Pre-blow time: 1-3 seconds

Station 3: Stretch Blow Molding Temperature-optimized preforms rotate 90° to the stretch blow station. The stretch rod axially stretches the preform at preset speed while high-pressure air enables radial expansion, forming the final container shape.

Stretch Blow Key Technologies:

• Bidirectional Synchronous Control: Stretch speed and blow pressure curves coordinated
• Pressure Stage Control: Low pre-blow → medium forming → high-pressure setting
• Mold Temperature Control: Independent temperature zones
• Forming Monitoring: Real-time pressure, position, temperature monitoring

Quality Advantages:

1. Enhanced Clarity: Optimized temperature gradients reduce crystalline haze
2. Increased Strength: Improved molecular orientation increases mechanical properties 15-25%
3. Wall Uniformity: Thickness distribution CV value <8%
4. Weight Reduction: Additional 5-10% weight reduction compared to non-pre-blow processes

Station 4: Ejection & Finished Product Handling Formed containers rotate to the ejection station where they are smoothly pushed from molds and transferred to subsequent processes.

Ejection System Characteristics:

• Servo-controlled ejection with precise speed and stroke settings
• Vacuum-assisted ejection prevents container deformation
• Automatic air blast cleaning removes mold residues
• Online inspection interface for quality detection integration

Production Cycle Optimization:

• Standard cycle: 10-30 seconds (~12 seconds for 500ml PET bottle)
• Time distribution optimization: Four-station synchronization maximizes efficiency
• Mold change time: Quick change system, ≤25 minutes
• Start-up time: From cold start to stable production ≤30 minutes