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The continuous flat-pressing hot-pressing machine is the most valuable gem in the modern wood-based panel industry. It achieves high efficiency, high quality and large-scale production through its core technology of continuous, flat pressing and precise control in different zones. Although its technology is complex, the investment is huge, and the maintenance requirements are high, the significant economic benefits and product quality advantages it brings have made it an indispensable core equipment for large-scale fiberboard/strawboard production lines. Its technology is still evolving, moving towards higher speed, greater intelligence, and more energy-saving and environmentally friendly directions.
Core Concept
Continuous Production: Unlike traditional batch-operated multi-daylight presses, continuous flat presses operate uninterruptedly. Formed fiber mats are fed continuously into the press inlet, undergo heating, pressing, and curing while moving through the press, and emerge as solid panels continuously from the outlet.
Flat Pressing: Pressure is applied perpendicularly to the panel surface, ensuring uniform thickness and smooth, flat surfaces – essential for high-quality MDF.
Hot Pressing: Simultaneously with pressure, heat (typically from oil- or steam-heated platens) is applied to rapidly cure the resin binder (e.g., urea-formaldehyde) and bond the wood fibers.
Technical Advantages
Multi-Daylight Press | Continuous Flat-Press |
Batch production (3-15 min/cycle) | Continuous feeding (1-2 m/min) |
Thickness tolerance ±0.3 mm | Laser real-time monitoring (±0.15 mm) |
Density gradient >15% | Uniform density distribution (<8% gradient) |
High energy consumption (1.8 ton steam/m³) | 30% energy savings (thermal oil system) |
Core Structure and Composition
1.Hot press plate system: Composed of multiple heating plates, the interior is heated by heat transfer oil or steam to provide uniform temperature.
hot press system
accessories for hot press system
2.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
continuous belt press
3.Hydraulic system: Pressure is applied through hydraulic cylinders, and the pressing force in different areas can be adjusted in sections.
Hydraulic system
Hydraulic system for PB/OSB/MDF production line
4.Control system: PLC or computer control, real-time monitoring of parameters such as temperature, pressure and speed.
siemens contronl system PLC
siemens accessories
5.Auxiliary equipment: includes paving machines, pre-pressing machines, cooling sections, sawing systems, etc.
forming machine
pre press machine
Dry rack
sander
Moisture-resistant board
Moisture-resistant board is a specially engineered artificial board designed for humid environments, featuring strong moisture resistance and anti-expansion properties.
1. Core Material:
Typically uses particleboard (also known as chipboard) or medium-density fiberboard (MDF) as the base.
These substrates are made from wood chips, particles, or fibers bonded with adhesive under heat and pressure.
2. Key Advantages:
（1）Excellent Moisture Resistance: Far superior to standard particleboard or MDF. Greatly reduces the risk of swelling, warping, or mold in damp environments (e.g., kitchens, bathrooms, basements).
（2）Eco-Friendliness: Due to added agents, it often has lower formaldehyde emissions, commonly meeting E1 or even E0 standards (varies by brand/product).
（3）Stable Physical Properties: Good load-bearing capacity and screw-holding strength (especially moisture-resistant particleboard), ideal for cabinet structures.
（4）Aesthetic Versatility: Surface finishes mimic wood grain, stone, solid colors, etc., offering attractive looks and easy cleaning.
Moisture content
The moisture content is a key quality control indicator for the core of the board.
Humidity: The ratio of the weight of moisture inside the board to the weight of the dried wood as a whole (%) (MC)
Environmental relative humidity: The percentage of water vapor content in the air (%) (RH)
Importance of moisture content index
1. Stability basis
When the moisture content of wood is greater than 8%, the fiber is in an expanded state and will shrink and deform in a dry environment;
When the moisture content is ≤8%, the internal stress of the board has been pre-released, and the deformation rate is the lowest in a subsequent 40%-60% RH environment.
2. Prerequisites for moisture-proofing agents to take effect
Moisture-proofing agents must be uniformly infiltrated and cured in low-water-content substrates. If the moisture content is too high (e.g. >12%):
Uneven distribution of moisture-proofing agents → Local moisture-proofing failure
Insufficient curing of adhesives → Decreased structural strength
3. International Standards
According to EN 322 testing standards:
Qualified moisture-proof panels must have a moisture content of ≤8% (applicable in temperate climates)
Tropical and humid regions have stricter requirements (≤6%, such as Singapore SS 554 standard)
Actory Moisture Content Standards for Engineered Wood Boards
Board Type | Factory Moisture Content Range | Testing Standard | Risks of Exceeding Limits | Drying Process Characteristics |
Moisture-Resistant Board | 5%–8% | EN 322 | Moisture-resistant agent failure | Secondary equilibrium kiln drying (55°C constant) |
Edge sealing warping | ||||
Plywood | 6%–10% | ASTM D4442 | Delamination | Veneer dryer (120°C air flow) |
Surface wave deformation | ||||
OSB (Oriented Strand Board) | 4%–12% | ANSI A208.1 | Edge bursting | Drum drying (strand MC ≤20% pre-drying) |
30% reduction in screw-holding strength | ||||
MDF (Medium-Density Fiberboard) | 5%–9% | EN 622-5 | ≥50% strength loss | Flash tube drying (0.5s high-temperature dehydration) |
Hygroscopic expansion | ||||
Particleboard | 6%–10% | EN 312 | Excessive expansion | Ring dryer (gradient moisture control) |
Accelerated formaldehyde emission | ||||
Multi-Layer Solid Wood | 8%–12% | GB/T 34722* | Loose joinery | Steam equilibrium kiln (48h slow-release drying) |
Paint cracking |
Upgrade your production line now!
We provide global installation support and technical training, 2-year machine warranty, and 24-hour online response - let your wood-based panel production enter a new era of intelligence and low carbonization.
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
The continuous flat-pressing hot-pressing machine is the most valuable gem in the modern wood-based panel industry. It achieves high efficiency, high quality and large-scale production through its core technology of continuous, flat pressing and precise control in different zones. Although its technology is complex, the investment is huge, and the maintenance requirements are high, the significant economic benefits and product quality advantages it brings have made it an indispensable core equipment for large-scale fiberboard/strawboard production lines. Its technology is still evolving, moving towards higher speed, greater intelligence, and more energy-saving and environmentally friendly directions.
Core Concept
Continuous Production: Unlike traditional batch-operated multi-daylight presses, continuous flat presses operate uninterruptedly. Formed fiber mats are fed continuously into the press inlet, undergo heating, pressing, and curing while moving through the press, and emerge as solid panels continuously from the outlet.
Flat Pressing: Pressure is applied perpendicularly to the panel surface, ensuring uniform thickness and smooth, flat surfaces – essential for high-quality MDF.
Hot Pressing: Simultaneously with pressure, heat (typically from oil- or steam-heated platens) is applied to rapidly cure the resin binder (e.g., urea-formaldehyde) and bond the wood fibers.
Technical Advantages
Multi-Daylight Press | Continuous Flat-Press |
Batch production (3-15 min/cycle) | Continuous feeding (1-2 m/min) |
Thickness tolerance ±0.3 mm | Laser real-time monitoring (±0.15 mm) |
Density gradient >15% | Uniform density distribution (<8% gradient) |
High energy consumption (1.8 ton steam/m³) | 30% energy savings (thermal oil system) |
Core Structure and Composition
1.Hot press plate system: Composed of multiple heating plates, the interior is heated by heat transfer oil or steam to provide uniform temperature.
hot press system
accessories for hot press system
2.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
continuous belt press
3.Hydraulic system: Pressure is applied through hydraulic cylinders, and the pressing force in different areas can be adjusted in sections.
Hydraulic system
Hydraulic system for PB/OSB/MDF production line
4.Control system: PLC or computer control, real-time monitoring of parameters such as temperature, pressure and speed.
siemens contronl system PLC
siemens accessories
5.Auxiliary equipment: includes paving machines, pre-pressing machines, cooling sections, sawing systems, etc.
forming machine
pre press machine
Dry rack
sander
Moisture-resistant board
Moisture-resistant board is a specially engineered artificial board designed for humid environments, featuring strong moisture resistance and anti-expansion properties.
1. Core Material:
Typically uses particleboard (also known as chipboard) or medium-density fiberboard (MDF) as the base.
These substrates are made from wood chips, particles, or fibers bonded with adhesive under heat and pressure.
2. Key Advantages:
（1）Excellent Moisture Resistance: Far superior to standard particleboard or MDF. Greatly reduces the risk of swelling, warping, or mold in damp environments (e.g., kitchens, bathrooms, basements).
（2）Eco-Friendliness: Due to added agents, it often has lower formaldehyde emissions, commonly meeting E1 or even E0 standards (varies by brand/product).
（3）Stable Physical Properties: Good load-bearing capacity and screw-holding strength (especially moisture-resistant particleboard), ideal for cabinet structures.
（4）Aesthetic Versatility: Surface finishes mimic wood grain, stone, solid colors, etc., offering attractive looks and easy cleaning.
Moisture content
The moisture content is a key quality control indicator for the core of the board.
Humidity: The ratio of the weight of moisture inside the board to the weight of the dried wood as a whole (%) (MC)
Environmental relative humidity: The percentage of water vapor content in the air (%) (RH)
Importance of moisture content index
1. Stability basis
When the moisture content of wood is greater than 8%, the fiber is in an expanded state and will shrink and deform in a dry environment;
When the moisture content is ≤8%, the internal stress of the board has been pre-released, and the deformation rate is the lowest in a subsequent 40%-60% RH environment.
2. Prerequisites for moisture-proofing agents to take effect
Moisture-proofing agents must be uniformly infiltrated and cured in low-water-content substrates. If the moisture content is too high (e.g. >12%):
Uneven distribution of moisture-proofing agents → Local moisture-proofing failure
Insufficient curing of adhesives → Decreased structural strength
3. International Standards
According to EN 322 testing standards:
Qualified moisture-proof panels must have a moisture content of ≤8% (applicable in temperate climates)
Tropical and humid regions have stricter requirements (≤6%, such as Singapore SS 554 standard)
Actory Moisture Content Standards for Engineered Wood Boards
Board Type | Factory Moisture Content Range | Testing Standard | Risks of Exceeding Limits | Drying Process Characteristics |
Moisture-Resistant Board | 5%–8% | EN 322 | Moisture-resistant agent failure | Secondary equilibrium kiln drying (55°C constant) |
Edge sealing warping | ||||
Plywood | 6%–10% | ASTM D4442 | Delamination | Veneer dryer (120°C air flow) |
Surface wave deformation | ||||
OSB (Oriented Strand Board) | 4%–12% | ANSI A208.1 | Edge bursting | Drum drying (strand MC ≤20% pre-drying) |
30% reduction in screw-holding strength | ||||
MDF (Medium-Density Fiberboard) | 5%–9% | EN 622-5 | ≥50% strength loss | Flash tube drying (0.5s high-temperature dehydration) |
Hygroscopic expansion | ||||
Particleboard | 6%–10% | EN 312 | Excessive expansion | Ring dryer (gradient moisture control) |
Accelerated formaldehyde emission | ||||
Multi-Layer Solid Wood | 8%–12% | GB/T 34722* | Loose joinery | Steam equilibrium kiln (48h slow-release drying) |
Paint cracking |
Upgrade your production line now!
We provide global installation support and technical training, 2-year machine warranty, and 24-hour online response - let your wood-based panel production enter a new era of intelligence and low carbonization.
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
