MINGHUNG
1. Strand Preparation:
Log Debarking & Bucking: Logs are debarked and cut into specific lengths.
Stranding: Logs/billets are flaked into thin wood strands using ring or disk flakers. Strand size is critical (typically 75-150mm long, 15-25mm wide).
Drying: Strands are dried in rotary or belt dryers (using hot gases) to precise moisture content (typically 2-4%) for optimal resin bonding.
Screening: Dried strands are screened to remove fines (dust) and oversized particles. Fines are often burned in the dryer's energy system.
2. Resin Blending & Mat Forming:
Resin & Wax Blending: Strands are blended with liquid resins (typically PMDI - Polymeric Methylene Diphenyl Diisocyanate and/or PF - Phenol Formaldehyde) and emulsified wax (for water resistance) in large blenders.
Oriented Mat Forming (The Key to OSB):
Forming Stations: Multiple forming heads (often 3+) deposit strands onto a moving conveyor belt.
Orientation: Critical technology uses mechanical or electrostatic methods to align strands:
Surface Layers: Strands are predominantly aligned parallel to the panel's length (machine direction).
Core Layer(s): Strands are either randomly oriented or aligned perpendicular to the surface strands (cross-direction). Modern lines often have dedicated cross-orienters.
Multi-Layer Structure: Creates the characteristic 3-layer (face-core-face) or multi-layer cross-ply structure, giving OSB its strength and dimensional stability.
3. Pre-Pressing:
Continuous Belt Press: The loose, layered mat passes through a cold pre-press (single- or multi-opening). This compacts the mat significantly (reducing height by ~50-70%) for easier handling into the hot press and prevents blowout.
4. Continuous Hot Pressing (Heart of the Line):
Steel Belt Continuous Press: The pre-pressed mat enters the massive continuous hot press. Key features:
Heated Steel Belts: Two thick, highly polished steel belts (upper & lower) carry the mat through the press. They are heated (typically 200-230°C / 392-446°F) via hot oil or steam circulating in internal channels.
Hydraulic/Nip Roll System: A series of hydraulic cylinders or nip rolls along the press length apply high, controlled pressure (typically 3-5 MPa / 435-725 psi) across the entire mat surface.
Zoning: The press is divided into multiple pressure and temperature zones. Pressure is highest at the entry (to rapidly compress the mat) and decreases towards the exit. Temperature profiles are precisely controlled.
Process: Under high heat and pressure, the thermosetting resins cure (polymerize) rapidly, bonding the strands into a solid panel in a continuous process. Dwell time is typically 3-6 minutes depending on thickness and speed.
5. Post-Pressing Processing:
Cooling Star: The hot, rigid panel exits the press onto a cooling conveyor (cooling star). Large fans blow ambient or cooled air over both surfaces to set the resin and reduce temperature (prevents blistering, improves handling).
Trimming & Sizing: Panels are trimmed to exact width on both edges and cut to precise length by flying cross-cut saws synchronized with the line speed.
Quality Control: Automated systems (e.g., X-ray density profilers, thickness gauges, visual inspection) monitor panel quality continuously.
Sandling (Optional): Some lines include wide-belt sanders to calibrate thickness or smooth surfaces for specific applications.
Stranding & Stacking: Panels are automatically stacked into bundles.
Bundling & Strapping: Bundles are strapped tightly for stability during transport and storage.
Storage/Finishing: Bundles may be stored or moved to finishing lines for edge sealing, priming, grooving, etc.
Key Technologies & Advantages of Continuous Press Lines:
High Production Speed & Output: Continuous operation enables much higher line speeds (e.g., 1.5-2.5 meters per minute press speed) and annual capacities (e.g., 300,000 to 600,000+ m³/year) compared to multi-opening presses.
Superior Product Quality:
Consistent Density Profile: Precise zone control creates a more uniform density gradient through the panel thickness.
Smooth Surfaces: Highly polished steel belts produce smoother surfaces than platen presses.
Improved Thickness Tolerance: Tighter control over panel thickness.
Reduced Resin Content: Efficient pressing can sometimes allow for slightly lower resin usage while maintaining strength.
Energy Efficiency: Modern continuous presses and dryers recover significant heat for reuse within the plant.
Process Control: Highly automated with sophisticated PLC/DCS systems for precise control over temperature, pressure, speed, and resin application, ensuring consistent quality.
Reduced Labor: High level of automation minimizes manual handling.
---
Major Suppliers of OSB Continuous Press Lines:
Siempelkamp (Germany): Market leader, especially for large-capacity lines (KontiPress series).
Dieffenbacher (Germany): Major competitor, known for CPS continuous presses.
Küsters (Germany - part of Valmet): Specializes in forming and prepress technology, often integrated with others' presses.
MINGHUNG GINZHUO （China）:CPS continuous presses,forming stations and auxiliary equipment. debarking
Custos (Sweden): Offers forming stations and auxiliary equipment.
Andritz (Austria): Supplies refining, drying, and forming equipment.
Contact us：
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
1. Strand Preparation:
Log Debarking & Bucking: Logs are debarked and cut into specific lengths.
Stranding: Logs/billets are flaked into thin wood strands using ring or disk flakers. Strand size is critical (typically 75-150mm long, 15-25mm wide).
Drying: Strands are dried in rotary or belt dryers (using hot gases) to precise moisture content (typically 2-4%) for optimal resin bonding.
Screening: Dried strands are screened to remove fines (dust) and oversized particles. Fines are often burned in the dryer's energy system.
2. Resin Blending & Mat Forming:
Resin & Wax Blending: Strands are blended with liquid resins (typically PMDI - Polymeric Methylene Diphenyl Diisocyanate and/or PF - Phenol Formaldehyde) and emulsified wax (for water resistance) in large blenders.
Oriented Mat Forming (The Key to OSB):
Forming Stations: Multiple forming heads (often 3+) deposit strands onto a moving conveyor belt.
Orientation: Critical technology uses mechanical or electrostatic methods to align strands:
Surface Layers: Strands are predominantly aligned parallel to the panel's length (machine direction).
Core Layer(s): Strands are either randomly oriented or aligned perpendicular to the surface strands (cross-direction). Modern lines often have dedicated cross-orienters.
Multi-Layer Structure: Creates the characteristic 3-layer (face-core-face) or multi-layer cross-ply structure, giving OSB its strength and dimensional stability.
3. Pre-Pressing:
Continuous Belt Press: The loose, layered mat passes through a cold pre-press (single- or multi-opening). This compacts the mat significantly (reducing height by ~50-70%) for easier handling into the hot press and prevents blowout.
4. Continuous Hot Pressing (Heart of the Line):
Steel Belt Continuous Press: The pre-pressed mat enters the massive continuous hot press. Key features:
Heated Steel Belts: Two thick, highly polished steel belts (upper & lower) carry the mat through the press. They are heated (typically 200-230°C / 392-446°F) via hot oil or steam circulating in internal channels.
Hydraulic/Nip Roll System: A series of hydraulic cylinders or nip rolls along the press length apply high, controlled pressure (typically 3-5 MPa / 435-725 psi) across the entire mat surface.
Zoning: The press is divided into multiple pressure and temperature zones. Pressure is highest at the entry (to rapidly compress the mat) and decreases towards the exit. Temperature profiles are precisely controlled.
Process: Under high heat and pressure, the thermosetting resins cure (polymerize) rapidly, bonding the strands into a solid panel in a continuous process. Dwell time is typically 3-6 minutes depending on thickness and speed.
5. Post-Pressing Processing:
Cooling Star: The hot, rigid panel exits the press onto a cooling conveyor (cooling star). Large fans blow ambient or cooled air over both surfaces to set the resin and reduce temperature (prevents blistering, improves handling).
Trimming & Sizing: Panels are trimmed to exact width on both edges and cut to precise length by flying cross-cut saws synchronized with the line speed.
Quality Control: Automated systems (e.g., X-ray density profilers, thickness gauges, visual inspection) monitor panel quality continuously.
Sandling (Optional): Some lines include wide-belt sanders to calibrate thickness or smooth surfaces for specific applications.
Stranding & Stacking: Panels are automatically stacked into bundles.
Bundling & Strapping: Bundles are strapped tightly for stability during transport and storage.
Storage/Finishing: Bundles may be stored or moved to finishing lines for edge sealing, priming, grooving, etc.
Key Technologies & Advantages of Continuous Press Lines:
High Production Speed & Output: Continuous operation enables much higher line speeds (e.g., 1.5-2.5 meters per minute press speed) and annual capacities (e.g., 300,000 to 600,000+ m³/year) compared to multi-opening presses.
Superior Product Quality:
Consistent Density Profile: Precise zone control creates a more uniform density gradient through the panel thickness.
Smooth Surfaces: Highly polished steel belts produce smoother surfaces than platen presses.
Improved Thickness Tolerance: Tighter control over panel thickness.
Reduced Resin Content: Efficient pressing can sometimes allow for slightly lower resin usage while maintaining strength.
Energy Efficiency: Modern continuous presses and dryers recover significant heat for reuse within the plant.
Process Control: Highly automated with sophisticated PLC/DCS systems for precise control over temperature, pressure, speed, and resin application, ensuring consistent quality.
Reduced Labor: High level of automation minimizes manual handling.
---
Major Suppliers of OSB Continuous Press Lines:
Siempelkamp (Germany): Market leader, especially for large-capacity lines (KontiPress series).
Dieffenbacher (Germany): Major competitor, known for CPS continuous presses.
Küsters (Germany - part of Valmet): Specializes in forming and prepress technology, often integrated with others' presses.
MINGHUNG GINZHUO （China）:CPS continuous presses,forming stations and auxiliary equipment. debarking
Custos (Sweden): Offers forming stations and auxiliary equipment.
Andritz (Austria): Supplies refining, drying, and forming equipment.
Contact us：
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
