MH-CHP
MINGHUNG
1. Double Steel Belt System:
Core Components: Two parallel, endless, highly polished, heat-resistant, high-strength special alloy steel belts (typically several meters wide and tens of meters long).
Function: These two belts form the "mold" surfaces for the panel. The upper and lower belts run synchronously, carrying the formed mat (usually pre-pressed) into the high-temperature, high-pressure zone.
Operation & Support: The belts are driven by large-diameter drive and idler rolls. Inside the press, the belts are supported by densely arranged support rolls or platens (hydrostatic lubrication systems), ensuring they run flat and stable under pressure, preventing sagging and tracking deviation. Precise belt guiding and tensioning systems are critical.
2. Heating System:
Heat Source: Typically uses high-temperature thermal oil (most common, offering uniform and stable temperature) or high-pressure steam as the heat transfer medium.
Heat Transfer: The heat transfer medium circulates through complex channels within the press frame, heating the support rolls or heating platens. Heat is then conducted to the moving steel belts, which in turn heat the pressed mat.
Zoned Temperature Control: The press length is usually divided into multiple independently controlled heating zones. Each zone can be precisely set to a different temperature to meet the mat's requirements during various pressing stages (preheating, plasticizing, curing), optimizing adhesive curing (e.g., UF, PF resins) and panel properties.
3.Pressurizing System:
Power Source: Utilizes powerful hydraulic systems (multiple cylinder groups) to provide pressure.
Zoned Pressurization: The press length is also divided into multiple independent pressure zones (often corresponding to temperature zones). Each pressure zone is controlled independently by one or more hydraulic cylinder groups.
Pressure Profile: Different target pressures can be set for each zone based on process requirements. A common pressure profile is: high pressure at entry (compaction, deaeration) -> moderate pressure reduction in the middle section (preventing over-compaction, controlling density distribution) -> low pressure at exit (calibration, cooling). This is a core technology enabling precise control in double belt presses.
Pressurizing Mechanism: Hydraulic cylinders push the upper movable crossbeam (or frame) downwards, applying pressure uniformly via support rolls or platens to the upper belt. This pressure transfers through the mat to the lower belt. The lower frame is usually fixed. Advanced systems use "frame-type" structures (like synchronous link frames) to ensure extremely uniform pressure distribution across the panel width.
4. Drive System:
Main Drive: Powerful motors drive the main drive rolls (usually entry or exit rolls), propelling both belts synchronously.
Synchronization Control: Sophisticated control systems ensure strict speed synchronization between the upper and lower belts, preventing surface scratches caused by relative sliding.
Speed Adjustment: Press speed (belt line speed) is a key process parameter, requiring precise setting and adjustment based on panel thickness, density, adhesive curing requirements, etc. Speed determines the mat's dwell time (pressing time) in the hot zone.
5. Entry & Exit Systems:
Entry:
Forming & Pre-pressing: Receives the continuous mat strip from the forming station (typically pre-compacted and deaerated in a pre-press).
Mat Detection & Guidance: Precisely detects mat edges to ensure centered entry into the press.
Belt Cleaning & Release Agent Spraying: Cleans belts before entry; sometimes sprays release agent to prevent sticking.
Exit:
Panel Discharge: The continuous pressed panel strip exits the press.
Cooling: Usually followed by a cooling section (e.g., star cooler, rack cooler) to rapidly cool and stabilize the panels, preventing warping.
Belt Cooling & Cleaning: Belts are cooled (e.g., via water-cooled rolls) and cleaned at the exit end, preparing for the next cycle.
6. Automation Control System:
Brain: Central control system based on high-performance PLCs and industrial computers.
Core Functions:
Process Control: Real-time, precise control of belt speed, zoned temperatures, and zoned pressures (forming the pressure profile).
Thickness Control: Real-time thickness monitoring via laser gauges at the exit provides feedback to adjust the exit gap or relevant pressure zones, enabling closed-loop control for minimal thickness tolerance (typically ±0.1~0.2mm).
Synchronization & Tension Control: Ensures synchronous belt running and constant tension.
Data Logging & Monitoring: Records all process parameters for quality traceability and production analysis. Includes comprehensive alarm and safety interlock functions.
HMI (Human-Machine Interface): Provides an intuitive interface for operators to set parameters, monitor status, and handle alarms.
1. Forming & Pre-pressing: Precisely metered and resinated wood fibers/strands are continuously formed into a loose mat by the forming station and fed into a pre-press for initial compaction and deaeration.
2. Feeding: The pre-pressed mat strip is precisely fed into the entry of the double belt press, sandwiched between the upper and lower belts.
3. Pressing:
Pressurization: The mat immediately enters the high-pressure zone for rapid compaction and air expulsion.
Heating & Curing: Moving at the set speed under the defined temperature and pressure profiles, the mat heats up. Heat plasticizes the wood and rapidly cures the adhesive, bonding the strands/fibers into a solid panel.
Calibration: In the middle/exit section, pressure reduces but is maintained, the belt gap is fixed, and the panel is precisely pressed to the target thickness while curing completes.
4. Panel Discharge: The cured continuous panel strip exits the press.
5. Cooling & Finishing: Panels enter the cooling section, followed by sawing (cross-cutting, trimming), sanding, stacking, and other finishing steps.
1.Extremely High Productivity: Continuous operation, no idle time. Production speed depends on thickness and curing time (line speeds can exceed 1000 mm/s). Massive single-line capacity (annual output up to hundreds of thousands of cubic meters).
2.Superior Panel Quality:
Minimal Thickness Tolerance: Closed-loop thickness control ensures highly uniform panel thickness.
Uniform Density Distribution: Continuous pressing and optimized pressure profiles result in a more rational and uniform density gradient from surface to core.
Excellent Surface Quality: Highly polished belts impart smooth, flat surfaces.
Stable Physical/Mechanical Properties: Precise and stable control of temperature, pressure, and time guarantees high consistency between batches.
3.Energy Saving & Reduced Consumption:
High Thermal Efficiency: Continuous operation minimizes significant heat losses associated with opening/closing multi-opening presses. Thermal oil systems are highly efficient.
Reduced Adhesive Consumption: More uniform density and curing allow for optimized resin application.
4.High Automation Level: Highly automated process reduces manual intervention, lowers labor intensity, and improves production stability.
5.Flexibility: Changing speed and pressure/temperature profiles allows relatively easy production of different thicknesses and densities on the same press (though thickness range is limited).
6.Relatively Compact Footprint: Compared to multi-opening presses and their loading/unloading systems of equivalent capacity, continuous presses extend in length with a fixed width, potentially enabling more compact layouts.
The Fully Automated Continuous Double Steel Belt Press is the absolute core of modern large-scale wood-based panel production lines, widely used for:
Particleboard Lines
MDF/HDF (Medium/High-Density Fiberboard) Lines
OSB (Oriented Strand Board) Lines
Hardboard Lines
Some Non-Wood Panels: Gypsum board, laminate flooring substrate, insulation board, etc.
Contact us for a free quote today!
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
1. Double Steel Belt System:
Core Components: Two parallel, endless, highly polished, heat-resistant, high-strength special alloy steel belts (typically several meters wide and tens of meters long).
Function: These two belts form the "mold" surfaces for the panel. The upper and lower belts run synchronously, carrying the formed mat (usually pre-pressed) into the high-temperature, high-pressure zone.
Operation & Support: The belts are driven by large-diameter drive and idler rolls. Inside the press, the belts are supported by densely arranged support rolls or platens (hydrostatic lubrication systems), ensuring they run flat and stable under pressure, preventing sagging and tracking deviation. Precise belt guiding and tensioning systems are critical.
2. Heating System:
Heat Source: Typically uses high-temperature thermal oil (most common, offering uniform and stable temperature) or high-pressure steam as the heat transfer medium.
Heat Transfer: The heat transfer medium circulates through complex channels within the press frame, heating the support rolls or heating platens. Heat is then conducted to the moving steel belts, which in turn heat the pressed mat.
Zoned Temperature Control: The press length is usually divided into multiple independently controlled heating zones. Each zone can be precisely set to a different temperature to meet the mat's requirements during various pressing stages (preheating, plasticizing, curing), optimizing adhesive curing (e.g., UF, PF resins) and panel properties.
3.Pressurizing System:
Power Source: Utilizes powerful hydraulic systems (multiple cylinder groups) to provide pressure.
Zoned Pressurization: The press length is also divided into multiple independent pressure zones (often corresponding to temperature zones). Each pressure zone is controlled independently by one or more hydraulic cylinder groups.
Pressure Profile: Different target pressures can be set for each zone based on process requirements. A common pressure profile is: high pressure at entry (compaction, deaeration) -> moderate pressure reduction in the middle section (preventing over-compaction, controlling density distribution) -> low pressure at exit (calibration, cooling). This is a core technology enabling precise control in double belt presses.
Pressurizing Mechanism: Hydraulic cylinders push the upper movable crossbeam (or frame) downwards, applying pressure uniformly via support rolls or platens to the upper belt. This pressure transfers through the mat to the lower belt. The lower frame is usually fixed. Advanced systems use "frame-type" structures (like synchronous link frames) to ensure extremely uniform pressure distribution across the panel width.
4. Drive System:
Main Drive: Powerful motors drive the main drive rolls (usually entry or exit rolls), propelling both belts synchronously.
Synchronization Control: Sophisticated control systems ensure strict speed synchronization between the upper and lower belts, preventing surface scratches caused by relative sliding.
Speed Adjustment: Press speed (belt line speed) is a key process parameter, requiring precise setting and adjustment based on panel thickness, density, adhesive curing requirements, etc. Speed determines the mat's dwell time (pressing time) in the hot zone.
5. Entry & Exit Systems:
Entry:
Forming & Pre-pressing: Receives the continuous mat strip from the forming station (typically pre-compacted and deaerated in a pre-press).
Mat Detection & Guidance: Precisely detects mat edges to ensure centered entry into the press.
Belt Cleaning & Release Agent Spraying: Cleans belts before entry; sometimes sprays release agent to prevent sticking.
Exit:
Panel Discharge: The continuous pressed panel strip exits the press.
Cooling: Usually followed by a cooling section (e.g., star cooler, rack cooler) to rapidly cool and stabilize the panels, preventing warping.
Belt Cooling & Cleaning: Belts are cooled (e.g., via water-cooled rolls) and cleaned at the exit end, preparing for the next cycle.
6. Automation Control System:
Brain: Central control system based on high-performance PLCs and industrial computers.
Core Functions:
Process Control: Real-time, precise control of belt speed, zoned temperatures, and zoned pressures (forming the pressure profile).
Thickness Control: Real-time thickness monitoring via laser gauges at the exit provides feedback to adjust the exit gap or relevant pressure zones, enabling closed-loop control for minimal thickness tolerance (typically ±0.1~0.2mm).
Synchronization & Tension Control: Ensures synchronous belt running and constant tension.
Data Logging & Monitoring: Records all process parameters for quality traceability and production analysis. Includes comprehensive alarm and safety interlock functions.
HMI (Human-Machine Interface): Provides an intuitive interface for operators to set parameters, monitor status, and handle alarms.
1. Forming & Pre-pressing: Precisely metered and resinated wood fibers/strands are continuously formed into a loose mat by the forming station and fed into a pre-press for initial compaction and deaeration.
2. Feeding: The pre-pressed mat strip is precisely fed into the entry of the double belt press, sandwiched between the upper and lower belts.
3. Pressing:
Pressurization: The mat immediately enters the high-pressure zone for rapid compaction and air expulsion.
Heating & Curing: Moving at the set speed under the defined temperature and pressure profiles, the mat heats up. Heat plasticizes the wood and rapidly cures the adhesive, bonding the strands/fibers into a solid panel.
Calibration: In the middle/exit section, pressure reduces but is maintained, the belt gap is fixed, and the panel is precisely pressed to the target thickness while curing completes.
4. Panel Discharge: The cured continuous panel strip exits the press.
5. Cooling & Finishing: Panels enter the cooling section, followed by sawing (cross-cutting, trimming), sanding, stacking, and other finishing steps.
1.Extremely High Productivity: Continuous operation, no idle time. Production speed depends on thickness and curing time (line speeds can exceed 1000 mm/s). Massive single-line capacity (annual output up to hundreds of thousands of cubic meters).
2.Superior Panel Quality:
Minimal Thickness Tolerance: Closed-loop thickness control ensures highly uniform panel thickness.
Uniform Density Distribution: Continuous pressing and optimized pressure profiles result in a more rational and uniform density gradient from surface to core.
Excellent Surface Quality: Highly polished belts impart smooth, flat surfaces.
Stable Physical/Mechanical Properties: Precise and stable control of temperature, pressure, and time guarantees high consistency between batches.
3.Energy Saving & Reduced Consumption:
High Thermal Efficiency: Continuous operation minimizes significant heat losses associated with opening/closing multi-opening presses. Thermal oil systems are highly efficient.
Reduced Adhesive Consumption: More uniform density and curing allow for optimized resin application.
4.High Automation Level: Highly automated process reduces manual intervention, lowers labor intensity, and improves production stability.
5.Flexibility: Changing speed and pressure/temperature profiles allows relatively easy production of different thicknesses and densities on the same press (though thickness range is limited).
6.Relatively Compact Footprint: Compared to multi-opening presses and their loading/unloading systems of equivalent capacity, continuous presses extend in length with a fixed width, potentially enabling more compact layouts.
The Fully Automated Continuous Double Steel Belt Press is the absolute core of modern large-scale wood-based panel production lines, widely used for:
Particleboard Lines
MDF/HDF (Medium/High-Density Fiberboard) Lines
OSB (Oriented Strand Board) Lines
Hardboard Lines
Some Non-Wood Panels: Gypsum board, laminate flooring substrate, insulation board, etc.
Contact us for a free quote today!
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
