MH-OSB
MINGHUNG
Core Function: To transform loosely formed, pre-pressed OSB mats into solid panels by applying precisely controlled high temperature and high pressure while the mat moves continuously. This process cures the thermosetting resin (typically PMDI or phenolic) binding the wood strands, resulting in OSB panels with specified thickness, density, mechanical properties, and dimensional stability.
Core Characteristics:
Continuous Operation: Unlike batch presses (which press one panel at a time), continuous flat presses operate uninterruptedly, achieving extremely high production efficiency suitable for large-scale industrial manufacturing.
Flat Pressing: Pressure is applied uniformly to the top and bottom surfaces of the mat via two massive heated platens, producing smooth, flat panel surfaces.
High Pressure & High Temperature: Provides the immense pressure and heat required for OSB curing.
Precise Control: Enables highly accurate zoned control of pressure, temperature, and time (indirectly controlled via press speed), ensuring uniform and stable panel quality.
The continuous flat press is an extremely large and complex system, comprising these core components:
1. Main Frame
Massive welded steel structure forming the press skeleton.
Bears the enormous pressing force (typically thousands or tens of thousands of tons), requiring extremely high rigidity and stability to minimize deflection during pressing.
Includes guidance systems ensuring precise and stable vertical movement of the upper platen.
2. Heated Platen System
Upper Platen: Typically a single massive thick steel plate or a combination of plates, containing dense internal pipe networks for heat transfer fluid circulation. Driven vertically by hydraulic cylinders.
Lower Platen: Similarly massive and thick, fixed to the main frame, also containing heating channels.
Material: High-strength alloy steel, resistant to wear, high temperature, with good thermal conductivity.
Heating Medium Channels: Precisely designed drilled holes or milled grooves ensure uniform heat distribution.
Zoned Heating: Typically divided into multiple independently controlled heating zones along the press length, allowing precise temperature profile control at different pressing stages (prevents surface pre-cure).
3. Steel Belt System
Upper Steel Belt & Lower Steel Belt: Two seamless, endless, special alloy steel belts, wide (matching panel width) and very long (covering the entire press length plus margin).
Function: Protect platen surfaces from wear and contamination; uniformly transfer pressure and heat to the mat; create smooth panel surfaces; convey the mat continuously through the press.
Drive System: Powerful motors drive the main drums, propelling the belts. Speed is adjustable to control pressing time.
Tensioning System: Maintains constant, appropriate belt tension during operation, preventing slippage and misalignment.
Tracking System (Edge Guide): Automatically monitors and adjusts belt path, preventing lateral deviation that could damage equipment.
Support Rolls/Sliders: Densely arranged rolls or low-friction material sliders inside the belts (facing the platens) support the belts, minimizing deformation and running resistance.
Cleaning & Lubrication System: Removes residues (resin, wood particles) from belt surfaces and applies special high-temperature lubricant to reduce friction between belts and platens/support elements.
4. Hydraulic System
High-Pressure Pump Station: Provides massive hydraulic power.
Main Hydraulic Cylinders: Numerous cylinders (dozens or even hundreds), distributed along the press length, drive the upper platen to apply pressure.
Core: Zoned Pressure Control (ZPC):
One of the core technologies of the CFP. Hydraulic cylinders are grouped into multiple independently controlled pressure zones (typically 10-30 or more, along the press length).
Each pressure zone can be independently set and precisely controlled.
Purpose:
Simulate the mat's thickness and density changes during pressing (high pressure needed for initial compression at the inlet, low pressure needed for controlled release at the outlet).
Compensate for mat variations (moisture content, mat uniformity) in real-time by adjusting local pressure, ensuring highly uniform panel thickness and density across the length and width.
Optimize the panel's vertical density profile (typically requiring higher surface density and lower core density).
5. Heating System
Heat Transfer Medium: Primarily high-temperature thermal oil (excellent thermal stability, precise temperature control, up to ~300°C+), less commonly high-pressure saturated steam (lower cost, but slightly inferior temperature control precision and maximum temperature).
Circulation System: Includes heating furnace (fuel oil, gas, or electric), high-temperature circulation pumps, expansion tank, heat exchangers (if needed), complex piping and valve systems.
Zoned Temperature Control: Platens are typically divided into multiple independently controlled temperature zones along the length. This allows setting different temperature profiles (e.g., slightly lower inlet temperature to prevent surface pre-cure, peak curing temperature in the middle zones, controlled cooling near the outlet to aid pressure release). Precise temperature control is vital for resin cure rate, panel properties, and avoiding defects (pre-cured layers, delamination).
6. Infeed & Discharge Systems
Infeed Conveyor: Usually a steel belt or heavy roller table matching the press width, feeding the mat smoothly and centered into the press inlet.
Inlet Seals/Scrapers: Prevent mat debris from entering the press interior and damaging belts or platens.
Discharge Conveyor: Receives the hot green board and transports it quickly away from the press for cooling.
Outlet Seals/Exhaust: Large volumes of steam and volatiles generated during pressing must be effectively extracted (typically connected to dust collection and exhaust treatment systems), while preventing ambient air ingress affecting the temperature field.
7. Lubrication System
Sprays special high-temperature synthetic lubricant between the steel belts and platens/support elements, and onto support rolls.
Significantly reduces friction, protects belt and platen surfaces, and lowers drive power consumption.
8. Control System
Brain: Highly automated, based on industrial PCs, PLCs, or DCS.
Functions:
Coordinates all subsystems (hydraulic pressure zones, belt speed, temperature zones, lubrication, infeed/discharge).
Sets and monitors pressing process parameters (target thickness, pressure setpoints per zone, temperature setpoints per zone, belt speed/pressing time).
Real-time data acquisition, display, logging, and alarm generation.
Fault diagnostics and safety interlock protection.
Communication and coordination with other line sections (forming, pre-press, finishing).
9. Auxiliary Systems
Cooling System: For hydraulic oil and critical components.
Safety Devices: Emergency stop buttons, safety light curtains, over-pressure protection, over-temperature protection, belt break detection, etc.
Monitoring Devices: Thickness scanners (online or at exit), belt position sensors, temperature/pressure sensors, etc.
Dual-Temperature Zone Control in Continuous Panel Presses refers to a technical solution for independently and precisely controlling the temperature of the press's upper and lower heating plates (or platens).
Specifically, it encompasses the following key points:
1. Independent Control of Upper/Lower Platen Temperatures:
Traditional presses might have a single temperature setting or linked control for both platens (with minimal difference).
The core of dual-temperature control is that the upper heating plate (typically contacting the panel's top surface) and the lower heating plate (typically contacting the panel's bottom surface) each have an independent temperature control system (including temperature sensors, control valves, actuators, etc.).
Operators or automated systems can set distinct target temperatures for the upper and lower platens.
2. Control Objectives:
Optimize Heat Transfer: Heat needs to transfer simultaneously from both surfaces into the core of the mat within the press. Dual-temperature control allows flexible adjustment of the heat supply intensity to each surface based on the mat structure (e.g., asymmetry, surface layers), material properties (e.g., thermal conductivity differences), adhesive curing requirements, and the press's inherent heat transfer characteristics (where upper/lower platens may naturally differ in efficiency).
Prevent Surface Pre-Curing/Scorching: In certain scenarios (e.g., producing thin boards, using fast-curing adhesives, or using temperature-sensitive surface materials like decorative paper, impregnated paper), uniform or excessively high platen temperatures can cause the mat surface to cure prematurely (pre-curing) or scorch before the core fully cures. Dual-temperature control allows reducing the temperature on the sensitive surface(s).
Ensure Core Curing: While preventing surface issues, sufficient core temperature must be achieved for complete adhesive curing. Adjusting the temperature on one or both sides allows better balancing of the temperature gradient between the surface and core.
Accommodate Different Product Structures: When producing overlaid panels (e.g., melamine-impregnated paper overlaid boards), the overlay side typically requires lower temperatures to prevent damage, while the substrate side may need higher temperatures for bonding strength. Dual-temperature control is key for achieving this asymmetric heating.
Compensate for Equipment Variations: In large presses, inherent temperature differences between upper and lower platens may exist due to structure, piping length, or heat loss. Dual-temperature control can actively compensate for these differences, ensuring consistent temperature uniformity across the entire width for both surfaces.
3. Implementation:
Independent Heat Transfer Media Circuits: Typically, the upper and lower platens have separate circuits for circulating heat transfer media (usually thermal oil or steam).
Independent Temperature Sensors: Temperature sensors (e.g., thermocouples) are installed on both the upper and lower platens within each heating zone (presses are usually divided into multiple zones along their length).
Independent Control Valves: Each circuit (upper and lower plate per zone) has an independent regulating valve (e.g., steam proportional valve, thermal oil three-way mixing valve) to control the flow rate or temperature of the media entering that circuit.
Control System: A central control system (e.g., PLC/DCS) receives temperature signals from all sensors, compares them to their respective setpoints, and uses control algorithms (like PID) to independently adjust the opening of the corresponding control valves, achieving precise, independent regulation of upper and lower platen temperatures.
4. Process Optimization Parameters
Parameter | High-Temp Zone | Mid-Temp Zone | Impact |
Temperature Range | 210–230°C | 180–200°C | Surface cure speed vs. core penetration |
Pressure Gradient | High (>3.5 MPa) | Medium (2.5–3 MPa) | Reduces surface porosity |
Dwell Time Distribution | 30–40% | 60–70% | Insufficient time causes weak core curing |
Resin Compatibility | MDI Resin | PF/MUF Resin | Matches resin curing windows |
"Dual-Temperature Zone Control" in continuous panel presses is an advanced thermal management technology. By independently monitoring and controlling the temperature of the upper and lower press platens, it enables:
Finer Temperature Gradient Management: Meeting the needs of asymmetric mat structures (especially overlaid panels).
Prevention of Surface Defects: Effectively avoiding surface pre-curing and scorching.
Guaranteed Core Curing Quality: Optimizing heat transfer to ensure complete adhesive curing in the core.
Improved Product Quality and Consistency: Achieving more uniform and consistent panel physical/mechanical properties and surface quality.
Enhanced Production Flexibility: Adapting to a wider variety of product specifications and process requirements.
We are China professional factory and supplier of OSB board making machine, MDF/HDF making machine and Flakeboard/Particleboard making machine. Whatever which size, thickness, capacity you want to make, and whatever what kinds of raw materials do you use, our professional team can offer a suitable and good solution for you.
From A to Z, from Raw materials to the final wood based panel, we can offer you all necessary machinery. including: Wood chipper, Strander, Disc chipper, Ring flaker, Rotary drum dryer, Vibrating screener, Glue dosing and applying system, Refiner, Mat frorming line, Continuous pre-press, synchronous Cross-cut saw, Multi-layers Hot press /Continuous single layer hot press, Auto edge trimming machine line，Sanding line，etc.
Call +86 18769900191, +86 15805496117, +86 18954906501 or 【Live Chat】
Get a productivity upgrade plan within 24h
Core Function: To transform loosely formed, pre-pressed OSB mats into solid panels by applying precisely controlled high temperature and high pressure while the mat moves continuously. This process cures the thermosetting resin (typically PMDI or phenolic) binding the wood strands, resulting in OSB panels with specified thickness, density, mechanical properties, and dimensional stability.
Core Characteristics:
Continuous Operation: Unlike batch presses (which press one panel at a time), continuous flat presses operate uninterruptedly, achieving extremely high production efficiency suitable for large-scale industrial manufacturing.
Flat Pressing: Pressure is applied uniformly to the top and bottom surfaces of the mat via two massive heated platens, producing smooth, flat panel surfaces.
High Pressure & High Temperature: Provides the immense pressure and heat required for OSB curing.
Precise Control: Enables highly accurate zoned control of pressure, temperature, and time (indirectly controlled via press speed), ensuring uniform and stable panel quality.
The continuous flat press is an extremely large and complex system, comprising these core components:
1. Main Frame
Massive welded steel structure forming the press skeleton.
Bears the enormous pressing force (typically thousands or tens of thousands of tons), requiring extremely high rigidity and stability to minimize deflection during pressing.
Includes guidance systems ensuring precise and stable vertical movement of the upper platen.
2. Heated Platen System
Upper Platen: Typically a single massive thick steel plate or a combination of plates, containing dense internal pipe networks for heat transfer fluid circulation. Driven vertically by hydraulic cylinders.
Lower Platen: Similarly massive and thick, fixed to the main frame, also containing heating channels.
Material: High-strength alloy steel, resistant to wear, high temperature, with good thermal conductivity.
Heating Medium Channels: Precisely designed drilled holes or milled grooves ensure uniform heat distribution.
Zoned Heating: Typically divided into multiple independently controlled heating zones along the press length, allowing precise temperature profile control at different pressing stages (prevents surface pre-cure).
3. Steel Belt System
Upper Steel Belt & Lower Steel Belt: Two seamless, endless, special alloy steel belts, wide (matching panel width) and very long (covering the entire press length plus margin).
Function: Protect platen surfaces from wear and contamination; uniformly transfer pressure and heat to the mat; create smooth panel surfaces; convey the mat continuously through the press.
Drive System: Powerful motors drive the main drums, propelling the belts. Speed is adjustable to control pressing time.
Tensioning System: Maintains constant, appropriate belt tension during operation, preventing slippage and misalignment.
Tracking System (Edge Guide): Automatically monitors and adjusts belt path, preventing lateral deviation that could damage equipment.
Support Rolls/Sliders: Densely arranged rolls or low-friction material sliders inside the belts (facing the platens) support the belts, minimizing deformation and running resistance.
Cleaning & Lubrication System: Removes residues (resin, wood particles) from belt surfaces and applies special high-temperature lubricant to reduce friction between belts and platens/support elements.
4. Hydraulic System
High-Pressure Pump Station: Provides massive hydraulic power.
Main Hydraulic Cylinders: Numerous cylinders (dozens or even hundreds), distributed along the press length, drive the upper platen to apply pressure.
Core: Zoned Pressure Control (ZPC):
One of the core technologies of the CFP. Hydraulic cylinders are grouped into multiple independently controlled pressure zones (typically 10-30 or more, along the press length).
Each pressure zone can be independently set and precisely controlled.
Purpose:
Simulate the mat's thickness and density changes during pressing (high pressure needed for initial compression at the inlet, low pressure needed for controlled release at the outlet).
Compensate for mat variations (moisture content, mat uniformity) in real-time by adjusting local pressure, ensuring highly uniform panel thickness and density across the length and width.
Optimize the panel's vertical density profile (typically requiring higher surface density and lower core density).
5. Heating System
Heat Transfer Medium: Primarily high-temperature thermal oil (excellent thermal stability, precise temperature control, up to ~300°C+), less commonly high-pressure saturated steam (lower cost, but slightly inferior temperature control precision and maximum temperature).
Circulation System: Includes heating furnace (fuel oil, gas, or electric), high-temperature circulation pumps, expansion tank, heat exchangers (if needed), complex piping and valve systems.
Zoned Temperature Control: Platens are typically divided into multiple independently controlled temperature zones along the length. This allows setting different temperature profiles (e.g., slightly lower inlet temperature to prevent surface pre-cure, peak curing temperature in the middle zones, controlled cooling near the outlet to aid pressure release). Precise temperature control is vital for resin cure rate, panel properties, and avoiding defects (pre-cured layers, delamination).
6. Infeed & Discharge Systems
Infeed Conveyor: Usually a steel belt or heavy roller table matching the press width, feeding the mat smoothly and centered into the press inlet.
Inlet Seals/Scrapers: Prevent mat debris from entering the press interior and damaging belts or platens.
Discharge Conveyor: Receives the hot green board and transports it quickly away from the press for cooling.
Outlet Seals/Exhaust: Large volumes of steam and volatiles generated during pressing must be effectively extracted (typically connected to dust collection and exhaust treatment systems), while preventing ambient air ingress affecting the temperature field.
7. Lubrication System
Sprays special high-temperature synthetic lubricant between the steel belts and platens/support elements, and onto support rolls.
Significantly reduces friction, protects belt and platen surfaces, and lowers drive power consumption.
8. Control System
Brain: Highly automated, based on industrial PCs, PLCs, or DCS.
Functions:
Coordinates all subsystems (hydraulic pressure zones, belt speed, temperature zones, lubrication, infeed/discharge).
Sets and monitors pressing process parameters (target thickness, pressure setpoints per zone, temperature setpoints per zone, belt speed/pressing time).
Real-time data acquisition, display, logging, and alarm generation.
Fault diagnostics and safety interlock protection.
Communication and coordination with other line sections (forming, pre-press, finishing).
9. Auxiliary Systems
Cooling System: For hydraulic oil and critical components.
Safety Devices: Emergency stop buttons, safety light curtains, over-pressure protection, over-temperature protection, belt break detection, etc.
Monitoring Devices: Thickness scanners (online or at exit), belt position sensors, temperature/pressure sensors, etc.
Dual-Temperature Zone Control in Continuous Panel Presses refers to a technical solution for independently and precisely controlling the temperature of the press's upper and lower heating plates (or platens).
Specifically, it encompasses the following key points:
1. Independent Control of Upper/Lower Platen Temperatures:
Traditional presses might have a single temperature setting or linked control for both platens (with minimal difference).
The core of dual-temperature control is that the upper heating plate (typically contacting the panel's top surface) and the lower heating plate (typically contacting the panel's bottom surface) each have an independent temperature control system (including temperature sensors, control valves, actuators, etc.).
Operators or automated systems can set distinct target temperatures for the upper and lower platens.
2. Control Objectives:
Optimize Heat Transfer: Heat needs to transfer simultaneously from both surfaces into the core of the mat within the press. Dual-temperature control allows flexible adjustment of the heat supply intensity to each surface based on the mat structure (e.g., asymmetry, surface layers), material properties (e.g., thermal conductivity differences), adhesive curing requirements, and the press's inherent heat transfer characteristics (where upper/lower platens may naturally differ in efficiency).
Prevent Surface Pre-Curing/Scorching: In certain scenarios (e.g., producing thin boards, using fast-curing adhesives, or using temperature-sensitive surface materials like decorative paper, impregnated paper), uniform or excessively high platen temperatures can cause the mat surface to cure prematurely (pre-curing) or scorch before the core fully cures. Dual-temperature control allows reducing the temperature on the sensitive surface(s).
Ensure Core Curing: While preventing surface issues, sufficient core temperature must be achieved for complete adhesive curing. Adjusting the temperature on one or both sides allows better balancing of the temperature gradient between the surface and core.
Accommodate Different Product Structures: When producing overlaid panels (e.g., melamine-impregnated paper overlaid boards), the overlay side typically requires lower temperatures to prevent damage, while the substrate side may need higher temperatures for bonding strength. Dual-temperature control is key for achieving this asymmetric heating.
Compensate for Equipment Variations: In large presses, inherent temperature differences between upper and lower platens may exist due to structure, piping length, or heat loss. Dual-temperature control can actively compensate for these differences, ensuring consistent temperature uniformity across the entire width for both surfaces.
3. Implementation:
Independent Heat Transfer Media Circuits: Typically, the upper and lower platens have separate circuits for circulating heat transfer media (usually thermal oil or steam).
Independent Temperature Sensors: Temperature sensors (e.g., thermocouples) are installed on both the upper and lower platens within each heating zone (presses are usually divided into multiple zones along their length).
Independent Control Valves: Each circuit (upper and lower plate per zone) has an independent regulating valve (e.g., steam proportional valve, thermal oil three-way mixing valve) to control the flow rate or temperature of the media entering that circuit.
Control System: A central control system (e.g., PLC/DCS) receives temperature signals from all sensors, compares them to their respective setpoints, and uses control algorithms (like PID) to independently adjust the opening of the corresponding control valves, achieving precise, independent regulation of upper and lower platen temperatures.
4. Process Optimization Parameters
Parameter | High-Temp Zone | Mid-Temp Zone | Impact |
Temperature Range | 210–230°C | 180–200°C | Surface cure speed vs. core penetration |
Pressure Gradient | High (>3.5 MPa) | Medium (2.5–3 MPa) | Reduces surface porosity |
Dwell Time Distribution | 30–40% | 60–70% | Insufficient time causes weak core curing |
Resin Compatibility | MDI Resin | PF/MUF Resin | Matches resin curing windows |
"Dual-Temperature Zone Control" in continuous panel presses is an advanced thermal management technology. By independently monitoring and controlling the temperature of the upper and lower press platens, it enables:
Finer Temperature Gradient Management: Meeting the needs of asymmetric mat structures (especially overlaid panels).
Prevention of Surface Defects: Effectively avoiding surface pre-curing and scorching.
Guaranteed Core Curing Quality: Optimizing heat transfer to ensure complete adhesive curing in the core.
Improved Product Quality and Consistency: Achieving more uniform and consistent panel physical/mechanical properties and surface quality.
Enhanced Production Flexibility: Adapting to a wider variety of product specifications and process requirements.
We are China professional factory and supplier of OSB board making machine, MDF/HDF making machine and Flakeboard/Particleboard making machine. Whatever which size, thickness, capacity you want to make, and whatever what kinds of raw materials do you use, our professional team can offer a suitable and good solution for you.
From A to Z, from Raw materials to the final wood based panel, we can offer you all necessary machinery. including: Wood chipper, Strander, Disc chipper, Ring flaker, Rotary drum dryer, Vibrating screener, Glue dosing and applying system, Refiner, Mat frorming line, Continuous pre-press, synchronous Cross-cut saw, Multi-layers Hot press /Continuous single layer hot press, Auto edge trimming machine line，Sanding line，etc.
Call +86 18769900191, +86 15805496117, +86 18954906501 or 【Live Chat】
Get a productivity upgrade plan within 24h
