MH-CHP
MINGHUNG
The thickness control system of this continuous press is a sophisticated and precise closed-loop system. Its working principles and benefits are demonstrated in the following aspects:
1. Real-time Monitoring & Feedback:
High-precision laser distance sensors or radiation-based thickness gauges are installed at the press inlet, within the hot plate sections, and at the outlet.
These sensors continuously measure the real-time thickness of the mat and instantaneously transmit the data to the central control system (PLC/Industrial PC).
2. Intelligent Analysis & Decision-Making:
The central control system compares the received real-time thickness data with the preset process recipe (target thickness, tolerance range).
Based on advanced algorithmic models, the system instantly determines the trend and magnitude of any thickness deviation and calculates the required corrective commands.
3. Precision Execution & Dynamic Adjustment:
Inlet Mat Control: The system precisely controls the initial mat thickness and density distribution entering the press by adjusting the pre-press and forming station, ensuring thickness uniformity from the source.
Hot Plate Pressure & Gap Control: This is the core of thickness control.
Pressure Regulation: Precisely controlled pressure is applied to multiple independently controlled hydraulic cylinders via proportional servo valves, ensuring balanced pressure across different board zones and preventing local over-thickening or thinning.
Gap Regulation: The opening between the upper and lower hot plates in each press section (often dozens of sections) is controlled by precise servo motors or hydraulic servo mechanisms. Based on real-time thickness data, the system dynamically fine-tunes the opening of each section, achieving "micron-level" precision in shaping the board thickness.
Steel Belt Tension Control: Stable steel belt tension is fundamental for smooth board conveyance and consistent thickness. The automatic tensioning system ensures the steel belt does not affect the formed thickness due to slack or over-tightening during operation.
The working principle of the Automatic Continuous Particle Board Press can be summarized as: utilizing high temperature, high pressure, and a precise control system to continuously thermo-set and solidify a loose particle mat into a solid board of specified thickness and density in a constant moving process.
The specific process is as follows:
1. Mat Conveying and Pre-pressing: The loose particle mat formed by the forming station is first conveyed into the press inlet via a conveyor belt. Before entering the main press, it typically passes through a pre-press device. This pre-compresses the mat, expelling most of the air and giving it initial strength to prevent it from being blown apart by the high-speed steel belts at the main press entrance.
2. Continuous Feeding and Pressing: The pre-pressed mat is fed into the main press. It is carried by a massive, continuously circulating steel belt system, sandwiched between the upper and lower high-temperature steel belts. The entire press section is divided into multiple pressure zones (e.g., inlet zone, main pressure zone, pressure-holding zone, pressure-release zone).
3. Zoned Pressing and Heat Transfer:
Inlet Zone: Pressure increases rapidly to quickly compress the mat close to the target thickness.
Main Pressure Zone: The maximum pressure is applied and maintained steadily. Simultaneously, heated platens inside the press, circulating with high-temperature thermal oil or steam, efficiently transfer heat through the steel belts into the mat.
Pressure-Holding Zone: Pressure is appropriately reduced but maintained sufficiently to allow the mat to continue curing under high temperature.
Pressure-Release Zone: Pressure is released in a step-wise, gradual manner, allowing internal steam and residual stresses within the board to dissipate slowly, preventing "blowing" or spring-back deformation of the board.
4. Resin Curing and Forming: Under the combined action of high temperature (typically 180-220°C) and high pressure, the lignin in the wood undergoes some plasticization. Meanwhile, adhesives such as Urea-Formaldehyde (UF) or Melamine-Urea-Formaldehyde (MUF) on the particle surfaces rapidly cure, firmly bonding the loose particles together to form the final particle board with the required physical and mechanical properties.
5. Continuous Discharge and Cooling: The cured board is continuously discharged from the press outlet and enters the downstream cooling star for cooling. Finally, it is cut to length by a saw to become the finished board.
An Automatic Continuous Press is a complex integrated system. Its main components include:
1. Press Frame: A massive steel structure that provides rigid support for the entire press, withstanding the full pressing forces.
2. Steel Belt System: Typically two (upper and lower) endless, heat-resistant special alloy steel belts. They carry and convey the mat through the entire press section while transferring heat from the heating platens to the mat. It is equipped with belt tensioning, guiding, and cleaning systems.
3. Heating Platen System: Installed inside the press frame, behind the steel belts. They circulate high-temperature thermal oil or steam and serve as the "heat source" of the press for heating the platens and the mat.
4. Hydraulic System: The "power source" of the press. Comprises oil pumps, tanks, control valves, and a large number of hydraulic cylinders. These cylinders are distributed across different pressure zones and, controlled by computer, provide precise, adjustable pressure for each section.
5. Drive System: Includes the main drive rollers and motors that provide power for the continuous and smooth movement of the steel belts.
6. Thickness Control System: One of the core control systems. Includes laser thickness gauges, sensors, and servo valves, etc., to monitor the board thickness in real-time and dynamically adjust hydraulic pressure and platen gap to ensure precise thickness.
7. Central Control System (PLC): The "brain" of the press. Integrates PLCs and industrial computers to set process parameters, monitor the entire press operation, process data, and achieve fully automated control.
8. Infeed and Outfeed Devices: Include the infeed belt interfacing with the forming line, pre-press, discharge rollers, and synchronization devices to ensure smooth mat entry and board exit.
Fully Automated Production: The entire process, from mat feeding, hot pressing, and thickness monitoring to finished product discharge, operates without manual intervention, ensuring extremely high production efficiency and enabling 24/7 continuous operation.
High Precision & Uniformity: Thickness control accuracy can reach ±0.05mm to ±0.15mm, guaranteeing highly consistent thickness across the entire board and between production batches, significantly improving the first-grade yield.
Wide Adaptability: Capable of easily producing particle board, Oriented Strand Board (OSB), Medium-Density Fiberboard (MDF), etc., in various specifications (e.g., thickness from 2mm to over 40mm).
Energy Efficiency & High Output: The continuous pressing process offers higher thermal efficiency and greater output compared to discontinuous presses, leading to significantly lower energy consumption per unit of product.
Intelligent Management: Equipped with a Human-Machine Interface (HMI) for storing multiple product recipes and enabling quick changeovers. The system features fault diagnosis, data logging, and analysis functions, facilitating smart manufacturing.
This equipment is the essential choice for building high-end particle board production lines. It directly delivers:
Higher Product Added Value: Precise thickness is a fundamental requirement for high-end applications like furniture, laminate flooring, and interior decoration.
Lower Raw Material Consumption: Accurate thickness control prevents unnecessary material waste, directly saving costs.
Stronger Market Competitiveness: Stable and superior product quality is the cornerstone for winning orders and building a strong reputation.
Contact us for a free quote today!
Our contacts:
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
The thickness control system of this continuous press is a sophisticated and precise closed-loop system. Its working principles and benefits are demonstrated in the following aspects:
1. Real-time Monitoring & Feedback:
High-precision laser distance sensors or radiation-based thickness gauges are installed at the press inlet, within the hot plate sections, and at the outlet.
These sensors continuously measure the real-time thickness of the mat and instantaneously transmit the data to the central control system (PLC/Industrial PC).
2. Intelligent Analysis & Decision-Making:
The central control system compares the received real-time thickness data with the preset process recipe (target thickness, tolerance range).
Based on advanced algorithmic models, the system instantly determines the trend and magnitude of any thickness deviation and calculates the required corrective commands.
3. Precision Execution & Dynamic Adjustment:
Inlet Mat Control: The system precisely controls the initial mat thickness and density distribution entering the press by adjusting the pre-press and forming station, ensuring thickness uniformity from the source.
Hot Plate Pressure & Gap Control: This is the core of thickness control.
Pressure Regulation: Precisely controlled pressure is applied to multiple independently controlled hydraulic cylinders via proportional servo valves, ensuring balanced pressure across different board zones and preventing local over-thickening or thinning.
Gap Regulation: The opening between the upper and lower hot plates in each press section (often dozens of sections) is controlled by precise servo motors or hydraulic servo mechanisms. Based on real-time thickness data, the system dynamically fine-tunes the opening of each section, achieving "micron-level" precision in shaping the board thickness.
Steel Belt Tension Control: Stable steel belt tension is fundamental for smooth board conveyance and consistent thickness. The automatic tensioning system ensures the steel belt does not affect the formed thickness due to slack or over-tightening during operation.
The working principle of the Automatic Continuous Particle Board Press can be summarized as: utilizing high temperature, high pressure, and a precise control system to continuously thermo-set and solidify a loose particle mat into a solid board of specified thickness and density in a constant moving process.
The specific process is as follows:
1. Mat Conveying and Pre-pressing: The loose particle mat formed by the forming station is first conveyed into the press inlet via a conveyor belt. Before entering the main press, it typically passes through a pre-press device. This pre-compresses the mat, expelling most of the air and giving it initial strength to prevent it from being blown apart by the high-speed steel belts at the main press entrance.
2. Continuous Feeding and Pressing: The pre-pressed mat is fed into the main press. It is carried by a massive, continuously circulating steel belt system, sandwiched between the upper and lower high-temperature steel belts. The entire press section is divided into multiple pressure zones (e.g., inlet zone, main pressure zone, pressure-holding zone, pressure-release zone).
3. Zoned Pressing and Heat Transfer:
Inlet Zone: Pressure increases rapidly to quickly compress the mat close to the target thickness.
Main Pressure Zone: The maximum pressure is applied and maintained steadily. Simultaneously, heated platens inside the press, circulating with high-temperature thermal oil or steam, efficiently transfer heat through the steel belts into the mat.
Pressure-Holding Zone: Pressure is appropriately reduced but maintained sufficiently to allow the mat to continue curing under high temperature.
Pressure-Release Zone: Pressure is released in a step-wise, gradual manner, allowing internal steam and residual stresses within the board to dissipate slowly, preventing "blowing" or spring-back deformation of the board.
4. Resin Curing and Forming: Under the combined action of high temperature (typically 180-220°C) and high pressure, the lignin in the wood undergoes some plasticization. Meanwhile, adhesives such as Urea-Formaldehyde (UF) or Melamine-Urea-Formaldehyde (MUF) on the particle surfaces rapidly cure, firmly bonding the loose particles together to form the final particle board with the required physical and mechanical properties.
5. Continuous Discharge and Cooling: The cured board is continuously discharged from the press outlet and enters the downstream cooling star for cooling. Finally, it is cut to length by a saw to become the finished board.
An Automatic Continuous Press is a complex integrated system. Its main components include:
1. Press Frame: A massive steel structure that provides rigid support for the entire press, withstanding the full pressing forces.
2. Steel Belt System: Typically two (upper and lower) endless, heat-resistant special alloy steel belts. They carry and convey the mat through the entire press section while transferring heat from the heating platens to the mat. It is equipped with belt tensioning, guiding, and cleaning systems.
3. Heating Platen System: Installed inside the press frame, behind the steel belts. They circulate high-temperature thermal oil or steam and serve as the "heat source" of the press for heating the platens and the mat.
4. Hydraulic System: The "power source" of the press. Comprises oil pumps, tanks, control valves, and a large number of hydraulic cylinders. These cylinders are distributed across different pressure zones and, controlled by computer, provide precise, adjustable pressure for each section.
5. Drive System: Includes the main drive rollers and motors that provide power for the continuous and smooth movement of the steel belts.
6. Thickness Control System: One of the core control systems. Includes laser thickness gauges, sensors, and servo valves, etc., to monitor the board thickness in real-time and dynamically adjust hydraulic pressure and platen gap to ensure precise thickness.
7. Central Control System (PLC): The "brain" of the press. Integrates PLCs and industrial computers to set process parameters, monitor the entire press operation, process data, and achieve fully automated control.
8. Infeed and Outfeed Devices: Include the infeed belt interfacing with the forming line, pre-press, discharge rollers, and synchronization devices to ensure smooth mat entry and board exit.
Fully Automated Production: The entire process, from mat feeding, hot pressing, and thickness monitoring to finished product discharge, operates without manual intervention, ensuring extremely high production efficiency and enabling 24/7 continuous operation.
High Precision & Uniformity: Thickness control accuracy can reach ±0.05mm to ±0.15mm, guaranteeing highly consistent thickness across the entire board and between production batches, significantly improving the first-grade yield.
Wide Adaptability: Capable of easily producing particle board, Oriented Strand Board (OSB), Medium-Density Fiberboard (MDF), etc., in various specifications (e.g., thickness from 2mm to over 40mm).
Energy Efficiency & High Output: The continuous pressing process offers higher thermal efficiency and greater output compared to discontinuous presses, leading to significantly lower energy consumption per unit of product.
Intelligent Management: Equipped with a Human-Machine Interface (HMI) for storing multiple product recipes and enabling quick changeovers. The system features fault diagnosis, data logging, and analysis functions, facilitating smart manufacturing.
This equipment is the essential choice for building high-end particle board production lines. It directly delivers:
Higher Product Added Value: Precise thickness is a fundamental requirement for high-end applications like furniture, laminate flooring, and interior decoration.
Lower Raw Material Consumption: Accurate thickness control prevents unnecessary material waste, directly saving costs.
Stronger Market Competitiveness: Stable and superior product quality is the cornerstone for winning orders and building a strong reputation.
Contact us for a free quote today!
Our contacts:
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
