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Continuous flat-pressing hot presses (Continuous Press, CP) offer significant and multi-dimensional energy-saving advantages over traditional intermittent multi-daylight hot presses (Multi-Daylight Press, MDP) or single-opening presses. These advantages stem from their continuous production mode, structural design, and advanced control systems.
Continuous Flat Press is a key equipment in woodworking machinery used in the production of man-made boards (such as particleboard, fiberboard, oriented strand board, etc.). It uses a continuous hot pressing process to press the slabs mixed with wood fibers or scraps and adhesives into high-strength, high-density boards.
Ⅰ.Working Principle
The core of the continuous flat hot press is to continuously press the slab through high temperature and high pressure. Its working process is as follows:
1.Feeding: The slab after paving and forming is sent to the entrance of the hot press through a conveyor belt.
2.Preheating and pre-pressing: Before the slab enters the main pressing area, the adhesive is softened by a preheating device and the air is expelled by pre-pressing.
3.Main pressing: The slab enters the pressing area composed of multiple layers of hot pressing plates, and is continuously pressed under high temperature (usually 180-250℃) and high pressure (2-5 MPa) to solidify the adhesive and tightly combine the fibers.
4.Cooling and board discharge: The pressed board is cooled and shaped in the cooling section, and then cut into standard sizes.
Ⅱ.Core Structure and Composition
Hot press plate system: Composed of multiple heating plates, the interior is heated by heat transfer oil or steam to provide uniform temperature.
heating plate for continuous press
continous belt press
Steel belt system: Two circulating steel belts (upper and lower) hold the slabs and run continuously to ensure uniform pressure transmission.
Two circulating steel belts
steel belts
Hydraulic system: Pressure is applied through hydraulic cylinders, and the pressing force in different areas can be adjusted in sections.
hydraulic cylinders for PB/OSB/MDF production line
hydraulic system
Control system: PLC or computer control, real-time monitoring of parameters such as temperature, pressure and speed.
siemens PCL
HMI
Auxiliary equipment: includes paving machines, pre-pressing machines, cooling sections, sawing systems, etc.
paving machine
pre-pressing machine
cooling section
Energy Saving Advantages of Continuous Flat-Pressing Hot Presses vs. Traditional Hot Presses
1. Elimination of Idle Heat Loss (Core Advantage)
Problem with Traditional Presses | Continuous Flat-Press | |
Solution/Advantage | Energy Saving Effect | |
(1)Intermittent production requires the press to repeatedly open and close (each cycle includes: loading → closing/pressurizing → holding/heating → depressurizing/opening → unloading). (2)During opening, loading, and unloading, the high-temperature (200~230°C) press platens are directly exposed to air, losing significant heat through thermal radiation and convection. (3)Massive steel platens and frames continuously dissipate heat during non-pressing periods, requiring extra energy to maintain temperature. | (1)Continuous operation: The mat continuously enters and moves at constant speed between closed press platens, which are always in the closed and pressurized state. (2)No opening/closing action: Completely eliminates the time window where platens are exposed and lose heat. | (1)Heat loss reduced by 30%~50% or more (This is the most significant saving). (2)Eliminates the need for frequent reheating to compensate for temperature drops during opening/closing cycles, drastically reducing the energy required to maintain temperature. |
2. More Precise, Efficient Temperature Control & Heat Utilization
Problem with Traditional Presses | Continuous Flat-Press | |
Solution/Advantage | Energy Saving Effect | |
(1)Temperature distribution across large, single platens can be uneven (especially at edges). (2)Heating systems have slow response times, making it difficult to precisely adjust temperature in real-time based on the mat's position. (3)Long heat transfer paths (from heating medium → platen → mat surface → mat core) result in lower efficiency. | (1)Zone temperature control: Platens are divided lengthwise into multiple independent heating/cooling zones (often dozens). (2)Dynamic temperature adjustment: Each zone can be independently set and precisely controlled, creating an optimized temperature profile: Infeed Zone: Lower temperature preheats the mat, driving off some moisture/VOCs, reducing steam explosion risk. Main Curing Zone: High temperature/pressure ensures rapid resin curing. Outfeed Zone: Gradual cooling sets the board shape, reducing internal stresses and lowering exit temperature. Direct contact heating: High-temperature steel belts/cauls directly contact the mat surfaces, enabling highly efficient heat conduction. | (1)Reduces over-heating: Heat is applied only where and when needed, avoiding energy waste. (2) Increases curing efficiency: Optimized temperature profile allows resins to cure fully in less effective time. (3) Lowers exit board temperature: Reduces subsequent cooling energy consumption |
3. Lower Drive & Hydraulic System Energy Consumption
Problem with Traditional Presses | Continuous Flat-Press | |
Solution/Advantage | Energy Saving Effect | |
(1)Each cycle requires driving massive press frames to perform high-frequency, long-stroke opening/closing movements (hydraulic cylinders). (2)Each closure requires instantaneous build-up of extremely high pressure (>100 bar), subjecting hydraulic systems to severe shock loads. (3)High-pressure oil pumps must be sized for peak power, operating inefficiently at partial load most of the time. | (1)Continuous, uniform motion: Main drive only needs to overcome friction from belts/mats moving between platens. (2)Gradual pressure build-up: Pressure is applied progressively and maintained constantly via cylinders/pads in zones, avoiding severe shocks. (3)VFD/Servo Control: Drive motors and pumps can use efficient VFD control, adjusting power based on actual load. | (1)Drive/hydraulic system electricity consumption reduced by 50%~70% (compared to intermittent presses of equivalent capacity). (2)Smoother equipment operation lowers maintenance costs. |
4. Higher Production Efficiency & Lower Energy Consumption per Unit
Problem with Traditional Presses | Continuous Flat-Press | |
Solution/Advantage | Energy Saving Effect | |
(1)Limited by opening/closing and loading/unloading times, effective pressing time is low (typically <50%). (2)Increasing layers (multi-daylight presses) to boost output results in larger, more energy-intensive equipment. | (1)24/7 continuous production: No loading/unloading pauses, equipment utilization can exceed 95%. (2)High line speed: Can reach over 1000 mm/s (depending on board thickness). (3)Massive single-line capacity: One continuous press line can exceed 500,000 m³/year, far surpassing multi-daylight presses. | (1)Significantly lower energy per tonne of board: Fixed heat losses and auxiliary equipment energy consumption per m³ of product are drastically reduced. (2)Economies of scale: High capacity dilutes unit product energy consumption. |
5. Perfect Synergy with Heat Recovery Systems (Amplifies Savings)
Problem with Traditional Presses | Continuous Flat-Press | |
Solution/Advantage | Energy Saving Effect | |
(1)Exhaust emissions are intermittent and pulsating, complicating heat recovery system design and reducing efficiency. (2)Condensate recovery systems must also adapt to cyclic operation. | (1)Generate a stable, continuous flow of high-temperature exhaust gas (relatively constant temperature and flow rate). (2)Generate a stable, continuous flow of high-temperature, high-pressure condensate. | (1)Enables heat recovery systems (exhaust heat exchange + flash steam recovery) to be designed and operated at maximum efficiency (as described earlier, recovering 60%~80% of waste heat). (2)Recovered thermal energy (hot air, flash steam) can be stably and efficiently supplied to the drying system, maximizing the displacement of primary energy. |
Summary of Energy Saving
1.Overall Energy Reduction: Total energy consumption per unit product (per m³ of OSB/particleboard/MDF) (steam + electricity) reduced by 30%~50%.
2.Steam Consumption Reduction:
(1)Steam consumption of the press itself reduced: 30%~40% (mainly from eliminating idle loss and precise temp control).
(2)With integrated heat recovery, total plant steam consumption reduced: 40%~60% (recovered heat used in drying).
3.Electricity Consumption Reduction:
(1)Press main drive/hydraulic system: Reduced by 50%~70%.
(2)Auxiliary equipment (e.g., fans): Significant savings also due to superior VFD control.
4.Capacity Increase: For comparable equipment size, continuous press output is typically 2~3 times higher or more than multi-daylight presses, offering a massive advantage in energy per unit.
Upgrade your production line now!
We provide global installation support and technical training, 1-year machine warranty, and 24-hour online response - let your OSB production enter a new era of intelligence and low carbonization.
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
Continuous flat-pressing hot presses (Continuous Press, CP) offer significant and multi-dimensional energy-saving advantages over traditional intermittent multi-daylight hot presses (Multi-Daylight Press, MDP) or single-opening presses. These advantages stem from their continuous production mode, structural design, and advanced control systems.
Continuous Flat Press is a key equipment in woodworking machinery used in the production of man-made boards (such as particleboard, fiberboard, oriented strand board, etc.). It uses a continuous hot pressing process to press the slabs mixed with wood fibers or scraps and adhesives into high-strength, high-density boards.
Ⅰ.Working Principle
The core of the continuous flat hot press is to continuously press the slab through high temperature and high pressure. Its working process is as follows:
1.Feeding: The slab after paving and forming is sent to the entrance of the hot press through a conveyor belt.
2.Preheating and pre-pressing: Before the slab enters the main pressing area, the adhesive is softened by a preheating device and the air is expelled by pre-pressing.
3.Main pressing: The slab enters the pressing area composed of multiple layers of hot pressing plates, and is continuously pressed under high temperature (usually 180-250℃) and high pressure (2-5 MPa) to solidify the adhesive and tightly combine the fibers.
4.Cooling and board discharge: The pressed board is cooled and shaped in the cooling section, and then cut into standard sizes.
Ⅱ.Core Structure and Composition
Hot press plate system: Composed of multiple heating plates, the interior is heated by heat transfer oil or steam to provide uniform temperature.
heating plate for continuous press
continous belt press
Steel belt system: Two circulating steel belts (upper and lower) hold the slabs and run continuously to ensure uniform pressure transmission.
Two circulating steel belts
steel belts
Hydraulic system: Pressure is applied through hydraulic cylinders, and the pressing force in different areas can be adjusted in sections.
hydraulic cylinders for PB/OSB/MDF production line
hydraulic system
Control system: PLC or computer control, real-time monitoring of parameters such as temperature, pressure and speed.
siemens PCL
HMI
Auxiliary equipment: includes paving machines, pre-pressing machines, cooling sections, sawing systems, etc.
paving machine
pre-pressing machine
cooling section
Energy Saving Advantages of Continuous Flat-Pressing Hot Presses vs. Traditional Hot Presses
1. Elimination of Idle Heat Loss (Core Advantage)
Problem with Traditional Presses | Continuous Flat-Press | |
Solution/Advantage | Energy Saving Effect | |
(1)Intermittent production requires the press to repeatedly open and close (each cycle includes: loading → closing/pressurizing → holding/heating → depressurizing/opening → unloading). (2)During opening, loading, and unloading, the high-temperature (200~230°C) press platens are directly exposed to air, losing significant heat through thermal radiation and convection. (3)Massive steel platens and frames continuously dissipate heat during non-pressing periods, requiring extra energy to maintain temperature. | (1)Continuous operation: The mat continuously enters and moves at constant speed between closed press platens, which are always in the closed and pressurized state. (2)No opening/closing action: Completely eliminates the time window where platens are exposed and lose heat. | (1)Heat loss reduced by 30%~50% or more (This is the most significant saving). (2)Eliminates the need for frequent reheating to compensate for temperature drops during opening/closing cycles, drastically reducing the energy required to maintain temperature. |
2. More Precise, Efficient Temperature Control & Heat Utilization
Problem with Traditional Presses | Continuous Flat-Press | |
Solution/Advantage | Energy Saving Effect | |
(1)Temperature distribution across large, single platens can be uneven (especially at edges). (2)Heating systems have slow response times, making it difficult to precisely adjust temperature in real-time based on the mat's position. (3)Long heat transfer paths (from heating medium → platen → mat surface → mat core) result in lower efficiency. | (1)Zone temperature control: Platens are divided lengthwise into multiple independent heating/cooling zones (often dozens). (2)Dynamic temperature adjustment: Each zone can be independently set and precisely controlled, creating an optimized temperature profile: Infeed Zone: Lower temperature preheats the mat, driving off some moisture/VOCs, reducing steam explosion risk. Main Curing Zone: High temperature/pressure ensures rapid resin curing. Outfeed Zone: Gradual cooling sets the board shape, reducing internal stresses and lowering exit temperature. Direct contact heating: High-temperature steel belts/cauls directly contact the mat surfaces, enabling highly efficient heat conduction. | (1)Reduces over-heating: Heat is applied only where and when needed, avoiding energy waste. (2) Increases curing efficiency: Optimized temperature profile allows resins to cure fully in less effective time. (3) Lowers exit board temperature: Reduces subsequent cooling energy consumption |
3. Lower Drive & Hydraulic System Energy Consumption
Problem with Traditional Presses | Continuous Flat-Press | |
Solution/Advantage | Energy Saving Effect | |
(1)Each cycle requires driving massive press frames to perform high-frequency, long-stroke opening/closing movements (hydraulic cylinders). (2)Each closure requires instantaneous build-up of extremely high pressure (>100 bar), subjecting hydraulic systems to severe shock loads. (3)High-pressure oil pumps must be sized for peak power, operating inefficiently at partial load most of the time. | (1)Continuous, uniform motion: Main drive only needs to overcome friction from belts/mats moving between platens. (2)Gradual pressure build-up: Pressure is applied progressively and maintained constantly via cylinders/pads in zones, avoiding severe shocks. (3)VFD/Servo Control: Drive motors and pumps can use efficient VFD control, adjusting power based on actual load. | (1)Drive/hydraulic system electricity consumption reduced by 50%~70% (compared to intermittent presses of equivalent capacity). (2)Smoother equipment operation lowers maintenance costs. |
4. Higher Production Efficiency & Lower Energy Consumption per Unit
Problem with Traditional Presses | Continuous Flat-Press | |
Solution/Advantage | Energy Saving Effect | |
(1)Limited by opening/closing and loading/unloading times, effective pressing time is low (typically <50%). (2)Increasing layers (multi-daylight presses) to boost output results in larger, more energy-intensive equipment. | (1)24/7 continuous production: No loading/unloading pauses, equipment utilization can exceed 95%. (2)High line speed: Can reach over 1000 mm/s (depending on board thickness). (3)Massive single-line capacity: One continuous press line can exceed 500,000 m³/year, far surpassing multi-daylight presses. | (1)Significantly lower energy per tonne of board: Fixed heat losses and auxiliary equipment energy consumption per m³ of product are drastically reduced. (2)Economies of scale: High capacity dilutes unit product energy consumption. |
5. Perfect Synergy with Heat Recovery Systems (Amplifies Savings)
Problem with Traditional Presses | Continuous Flat-Press | |
Solution/Advantage | Energy Saving Effect | |
(1)Exhaust emissions are intermittent and pulsating, complicating heat recovery system design and reducing efficiency. (2)Condensate recovery systems must also adapt to cyclic operation. | (1)Generate a stable, continuous flow of high-temperature exhaust gas (relatively constant temperature and flow rate). (2)Generate a stable, continuous flow of high-temperature, high-pressure condensate. | (1)Enables heat recovery systems (exhaust heat exchange + flash steam recovery) to be designed and operated at maximum efficiency (as described earlier, recovering 60%~80% of waste heat). (2)Recovered thermal energy (hot air, flash steam) can be stably and efficiently supplied to the drying system, maximizing the displacement of primary energy. |
Summary of Energy Saving
1.Overall Energy Reduction: Total energy consumption per unit product (per m³ of OSB/particleboard/MDF) (steam + electricity) reduced by 30%~50%.
2.Steam Consumption Reduction:
(1)Steam consumption of the press itself reduced: 30%~40% (mainly from eliminating idle loss and precise temp control).
(2)With integrated heat recovery, total plant steam consumption reduced: 40%~60% (recovered heat used in drying).
3.Electricity Consumption Reduction:
(1)Press main drive/hydraulic system: Reduced by 50%~70%.
(2)Auxiliary equipment (e.g., fans): Significant savings also due to superior VFD control.
4.Capacity Increase: For comparable equipment size, continuous press output is typically 2~3 times higher or more than multi-daylight presses, offering a massive advantage in energy per unit.
Upgrade your production line now!
We provide global installation support and technical training, 1-year machine warranty, and 24-hour online response - let your OSB production enter a new era of intelligence and low carbonization.
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com