MH-OSB
MINGHUNG
Definition: An OSB (Oriented Strand Board) continuous press is an automated production line that cures wood strands through continuous high-temperature/pressure processing, utilizing steel belts or roller chains for seamless mat feeding and pressing.
Key Features:
1. Continuous Production: Mat feeding at constant speed (typically 1.5–4 m/min), increasing efficiency by >300% vs. batch presses.
2. High-Precision Control:
Thickness tolerance: ±0.1mm (±0.05mm for advanced models)
Pressure control: ±2%
Temperature uniformity: ±1.5°C (zonal control)
3. Heat Transfer System:
Heat sources: Thermal oil (200–240°C) or steam (180–220°C)
Heating method: Zoned temperature control for resin curing optimization
Working principle and process flow
(1) Directed paving and pre-pressing
Directed paving:
OSB wood chips are divided into surface layer (longitudinally arranged) and core layer (transversely arranged), and are oriented by a special paving machine (such as a mechanical directional head or airflow paving system). The length of the surface layer wood chips is usually 50-100mm, and the core layer wood chips are shorter (20-50mm).
Pre-pressing and shaping:
The paved slab enters the pre-pressing machine (pressure 0.5-1.5MPa), and the air is removed and the direction of the wood chips is initially fixed by mechanical roller pressing or high-frequency pre-pressing to prevent the structure from loosening during the subsequent hot pressing process.
(2) Continuous hot pressing stage
High pressure zone (initial curing):
Temperature 210–230℃, pressure 3.0–5.0MPa, quickly close the slab and activate the adhesive (usually phenolic resin or MDI adhesive), and the surface wood shavings directional structure is initially cured.
Medium pressure zone (plasticization balance):
Temperature 200–220℃, pressure 2.0–3.5MPa, maintain full penetration of the core layer adhesive, and balance the curing rate of the inner and outer layers.
Low pressure zone (setting and stress release):
Temperature 180–200℃, pressure 1.0–2.0MPa, control the final thickness and release internal stress to avoid board warping.
(3) Cooling and post-processing
Cooling section:
The pressed sheet is cooled to below 50°C by a circulating water cooling system to stabilize the sheet size.
Cutting and sanding:
The sheet is cut into standard sheets using a high-speed sawing system, and the surface flatness is adjusted using a sander.
cross-cut saw
It is usually within ±50% of the designed thickness (for example: a press with a calibrated thickness of 15mm can produce plates ranging from 8mm to 22mm).
1. Standard Range:
Conventional: 4–40mm (covers 90% commercial OSB specifications)
Minimum increment: 0.1mm
2. Extreme Capabilities:
Ultra-thin boards: 3mm (requires specialized mat forming & gap control)
Ultra-thick boards: 50mm (dependent on cylinder stroke & heat penetration)
3. Dynamic Adjustment:
Thickness switching time: ≤10 seconds (automated recipe execution)
Tapered thickness: Supports 1:100 gradient slope (e.g., 40mm→20mm over 4m length)
Core Objectives
High-Precision Thickness Control: Produce OSB panels with minimal thickness tolerances across their entire length and width (typically required to reach ±0.1mm or better).
Thickness Adjustability: Ability to quickly and stably switch between producing different target thicknesses for different production batches or even within the same batch.
Continuous Production: Enable uninterrupted processes of mat feeding, pressing, heating, curing, and board discharge, significantly improving production efficiency.
High Quality: Ensure panels have uniform density distribution, strong internal bond strength, and good surface quality while maintaining precise thickness control.
1. Precision Mechanical Frame & Actuation System:
Rigid Frame: Constructed using high-strength steel and optimized design to ensure minimal deformation under immense pressure (up to several thousand tons), providing the foundation for thickness accuracy.
High-Precision Cylinder System:
Multi-Point Synchronous Control: Multiple hydraulic cylinders (or electric servo cylinders) arranged along the length and width of the press. Each cylinder or cylinder group is driven by an independent servo valve and high-response hydraulic system.
Closed-Loop Position/Pressure Control: Each cylinder is equipped with high-precision position sensors (e.g., magnetostrictive transducers) and pressure sensors. The control system continuously monitors and adjusts the position and pressure of each cylinder, ensuring the precise maintenance of the platen gap (i.e., target thickness) and uniform pressure distribution.
Dynamic Compensation: Capability to compensate in real-time for deviations caused by thermal expansion, frame elastic deformation, mat thickness variations, etc.
2. Advanced Measurement & Sensing Systems:
Online Thickness Measurement: Non-contact, high-precision thickness gauges (e.g., laser scanners, microwave gauges, X-ray gauges) installed at the press entrance, key internal positions (sometimes), and exit. These devices continuously scan the thickness profile of the mat or panel.
Pressure Distribution Measurement: Integration of pressure-sensing mats or pressure-sensitive paper technology may be used for calibration and verification of pressure uniformity.
Temperature Monitoring: Densely arranged thermocouples precisely monitor the temperature in each zone of the heated platens.
Position/Displacement Sensors: Used for direct measurement of cylinder position and platen spacing.
3. Intelligent Multivariable Integrated Control System:
Core Controller: Utilizes high-performance PLCs or dedicated industrial control computers with powerful real-time processing capabilities.
Multivariable Coupled Control Algorithms: This is the most critical technology. The system must simultaneously and coordinately control:
Platen Gap/Position (Primary Control Variable): Directly determines thickness.
Pressure: Affects density distribution and internal bond strength.
Temperature: Affects resin curing rate and heat transfer efficiency.
Feed Speed: Affects pressing time (degree of cure).
Model Predictive Control (MPC) / Adaptive Control: Advanced control systems utilize physical models (heat transfer, material rheology, curing kinetics) and real-time sensor data to predict future states and proactively adjust control parameters. They automatically adapt to changes in mat characteristics (moisture content, density, mat formation uniformity).
Feedforward & Feedback Control:
Feedback Control: Uses data from the exit thickness gauge to make real-time micro-adjustments to the setpoints at the press entrance or directly adjust platen gap/pressure.
Feedforward Control: Utilizes mat thickness profile information detected by the entrance gauge to proactively adjust the platen gap setpoints for corresponding zones, actively compensating for mat non-uniformity.
Zoning Control:
Thickness Zoning: The press width (typically perpendicular to the running direction) is divided into multiple control zones (e.g., every 100mm). The control system can independently fine-tune the platen position in each zone to correct lateral thickness deviations (e.g., edge thickening).
Temperature Zoning: Heated platens are also divided into multiple temperature control zones to ensure uniformity along both the length and width.
4. Efficient and Uniform Heating System:
Thermal Oil or Steam Heating: High-temperature heat transfer fluid circulates through precisely machined channels within the heated platens.
Zoned Temperature Control: Each temperature zone has independent flow control valves and temperature sensors for precise thermal management. Uniform heating is crucial for rapid and even resin curing, indirectly influencing thickness stability (uniform curing shrinkage).
5. Flexible and Rapid Thickness Adjustment Mechanism:
Pre-Set Recipes: Store optimized "recipes" containing the full set of process parameters (pressure, temperature, speed, gap, etc.) for different target thicknesses.
Automatic Switching: Upon operator selection of a recipe, the control system automatically adjusts the position setpoints of all zones to the new thickness requirement and synchronizes changes to related process parameters.
Dynamic Following: During continuous operation, the platen gap smoothly adjusts in real-time based on commands for changing target thickness (e.g., when producing panels with tapered thickness).
Synchronization: Ensures all zoned cylinders move quickly and synchronously to new target positions, preventing damage to the panel.
Exceptional Product Quality: Minimal thickness tolerance, uniform density distribution, stable and excellent physical-mechanical properties.
High Production Flexibility: Rapid switching between different thickness specifications, even enabling production of customized or tapered-thickness panels.
Reduced Raw Material Consumption: Precise thickness control translates to reduced sanding allowance, saving valuable wood fiber.
Increased Production Efficiency & Output: Continuous operation, short changeover times, high equipment utilization.
Reduced Energy Consumption: Optimizing process parameters (pressure, temperature, time) minimizes energy waste.
Lower Rejection Rate: High-precision real-time control enables rapid correction of deviations, preventing batch defects.
Primarily used in large-scale, high-efficiency, high-quality OSB production lines, meeting increasingly stringent requirements for dimensional accuracy and performance in construction (structural), packaging, and furniture manufacturing. Thickness precision is absolutely critical, especially when producing high-end structural OSB (e.g., I-joist webs).
Start Your Order Process Easily: Get a Detailed Quote & Global Shipping Options!
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
Definition: An OSB (Oriented Strand Board) continuous press is an automated production line that cures wood strands through continuous high-temperature/pressure processing, utilizing steel belts or roller chains for seamless mat feeding and pressing.
Key Features:
1. Continuous Production: Mat feeding at constant speed (typically 1.5–4 m/min), increasing efficiency by >300% vs. batch presses.
2. High-Precision Control:
Thickness tolerance: ±0.1mm (±0.05mm for advanced models)
Pressure control: ±2%
Temperature uniformity: ±1.5°C (zonal control)
3. Heat Transfer System:
Heat sources: Thermal oil (200–240°C) or steam (180–220°C)
Heating method: Zoned temperature control for resin curing optimization
Working principle and process flow
(1) Directed paving and pre-pressing
Directed paving:
OSB wood chips are divided into surface layer (longitudinally arranged) and core layer (transversely arranged), and are oriented by a special paving machine (such as a mechanical directional head or airflow paving system). The length of the surface layer wood chips is usually 50-100mm, and the core layer wood chips are shorter (20-50mm).
Pre-pressing and shaping:
The paved slab enters the pre-pressing machine (pressure 0.5-1.5MPa), and the air is removed and the direction of the wood chips is initially fixed by mechanical roller pressing or high-frequency pre-pressing to prevent the structure from loosening during the subsequent hot pressing process.
(2) Continuous hot pressing stage
High pressure zone (initial curing):
Temperature 210–230℃, pressure 3.0–5.0MPa, quickly close the slab and activate the adhesive (usually phenolic resin or MDI adhesive), and the surface wood shavings directional structure is initially cured.
Medium pressure zone (plasticization balance):
Temperature 200–220℃, pressure 2.0–3.5MPa, maintain full penetration of the core layer adhesive, and balance the curing rate of the inner and outer layers.
Low pressure zone (setting and stress release):
Temperature 180–200℃, pressure 1.0–2.0MPa, control the final thickness and release internal stress to avoid board warping.
(3) Cooling and post-processing
Cooling section:
The pressed sheet is cooled to below 50°C by a circulating water cooling system to stabilize the sheet size.
Cutting and sanding:
The sheet is cut into standard sheets using a high-speed sawing system, and the surface flatness is adjusted using a sander.
cross-cut saw
It is usually within ±50% of the designed thickness (for example: a press with a calibrated thickness of 15mm can produce plates ranging from 8mm to 22mm).
1. Standard Range:
Conventional: 4–40mm (covers 90% commercial OSB specifications)
Minimum increment: 0.1mm
2. Extreme Capabilities:
Ultra-thin boards: 3mm (requires specialized mat forming & gap control)
Ultra-thick boards: 50mm (dependent on cylinder stroke & heat penetration)
3. Dynamic Adjustment:
Thickness switching time: ≤10 seconds (automated recipe execution)
Tapered thickness: Supports 1:100 gradient slope (e.g., 40mm→20mm over 4m length)
Core Objectives
High-Precision Thickness Control: Produce OSB panels with minimal thickness tolerances across their entire length and width (typically required to reach ±0.1mm or better).
Thickness Adjustability: Ability to quickly and stably switch between producing different target thicknesses for different production batches or even within the same batch.
Continuous Production: Enable uninterrupted processes of mat feeding, pressing, heating, curing, and board discharge, significantly improving production efficiency.
High Quality: Ensure panels have uniform density distribution, strong internal bond strength, and good surface quality while maintaining precise thickness control.
1. Precision Mechanical Frame & Actuation System:
Rigid Frame: Constructed using high-strength steel and optimized design to ensure minimal deformation under immense pressure (up to several thousand tons), providing the foundation for thickness accuracy.
High-Precision Cylinder System:
Multi-Point Synchronous Control: Multiple hydraulic cylinders (or electric servo cylinders) arranged along the length and width of the press. Each cylinder or cylinder group is driven by an independent servo valve and high-response hydraulic system.
Closed-Loop Position/Pressure Control: Each cylinder is equipped with high-precision position sensors (e.g., magnetostrictive transducers) and pressure sensors. The control system continuously monitors and adjusts the position and pressure of each cylinder, ensuring the precise maintenance of the platen gap (i.e., target thickness) and uniform pressure distribution.
Dynamic Compensation: Capability to compensate in real-time for deviations caused by thermal expansion, frame elastic deformation, mat thickness variations, etc.
2. Advanced Measurement & Sensing Systems:
Online Thickness Measurement: Non-contact, high-precision thickness gauges (e.g., laser scanners, microwave gauges, X-ray gauges) installed at the press entrance, key internal positions (sometimes), and exit. These devices continuously scan the thickness profile of the mat or panel.
Pressure Distribution Measurement: Integration of pressure-sensing mats or pressure-sensitive paper technology may be used for calibration and verification of pressure uniformity.
Temperature Monitoring: Densely arranged thermocouples precisely monitor the temperature in each zone of the heated platens.
Position/Displacement Sensors: Used for direct measurement of cylinder position and platen spacing.
3. Intelligent Multivariable Integrated Control System:
Core Controller: Utilizes high-performance PLCs or dedicated industrial control computers with powerful real-time processing capabilities.
Multivariable Coupled Control Algorithms: This is the most critical technology. The system must simultaneously and coordinately control:
Platen Gap/Position (Primary Control Variable): Directly determines thickness.
Pressure: Affects density distribution and internal bond strength.
Temperature: Affects resin curing rate and heat transfer efficiency.
Feed Speed: Affects pressing time (degree of cure).
Model Predictive Control (MPC) / Adaptive Control: Advanced control systems utilize physical models (heat transfer, material rheology, curing kinetics) and real-time sensor data to predict future states and proactively adjust control parameters. They automatically adapt to changes in mat characteristics (moisture content, density, mat formation uniformity).
Feedforward & Feedback Control:
Feedback Control: Uses data from the exit thickness gauge to make real-time micro-adjustments to the setpoints at the press entrance or directly adjust platen gap/pressure.
Feedforward Control: Utilizes mat thickness profile information detected by the entrance gauge to proactively adjust the platen gap setpoints for corresponding zones, actively compensating for mat non-uniformity.
Zoning Control:
Thickness Zoning: The press width (typically perpendicular to the running direction) is divided into multiple control zones (e.g., every 100mm). The control system can independently fine-tune the platen position in each zone to correct lateral thickness deviations (e.g., edge thickening).
Temperature Zoning: Heated platens are also divided into multiple temperature control zones to ensure uniformity along both the length and width.
4. Efficient and Uniform Heating System:
Thermal Oil or Steam Heating: High-temperature heat transfer fluid circulates through precisely machined channels within the heated platens.
Zoned Temperature Control: Each temperature zone has independent flow control valves and temperature sensors for precise thermal management. Uniform heating is crucial for rapid and even resin curing, indirectly influencing thickness stability (uniform curing shrinkage).
5. Flexible and Rapid Thickness Adjustment Mechanism:
Pre-Set Recipes: Store optimized "recipes" containing the full set of process parameters (pressure, temperature, speed, gap, etc.) for different target thicknesses.
Automatic Switching: Upon operator selection of a recipe, the control system automatically adjusts the position setpoints of all zones to the new thickness requirement and synchronizes changes to related process parameters.
Dynamic Following: During continuous operation, the platen gap smoothly adjusts in real-time based on commands for changing target thickness (e.g., when producing panels with tapered thickness).
Synchronization: Ensures all zoned cylinders move quickly and synchronously to new target positions, preventing damage to the panel.
Exceptional Product Quality: Minimal thickness tolerance, uniform density distribution, stable and excellent physical-mechanical properties.
High Production Flexibility: Rapid switching between different thickness specifications, even enabling production of customized or tapered-thickness panels.
Reduced Raw Material Consumption: Precise thickness control translates to reduced sanding allowance, saving valuable wood fiber.
Increased Production Efficiency & Output: Continuous operation, short changeover times, high equipment utilization.
Reduced Energy Consumption: Optimizing process parameters (pressure, temperature, time) minimizes energy waste.
Lower Rejection Rate: High-precision real-time control enables rapid correction of deviations, preventing batch defects.
Primarily used in large-scale, high-efficiency, high-quality OSB production lines, meeting increasingly stringent requirements for dimensional accuracy and performance in construction (structural), packaging, and furniture manufacturing. Thickness precision is absolutely critical, especially when producing high-end structural OSB (e.g., I-joist webs).
Start Your Order Process Easily: Get a Detailed Quote & Global Shipping Options!
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
