MINGHUNG
As the application fields of wood-based panels continue to expand, market demand for thick panels (e.g., 25mm, 30mm, 40mm and above) is growing rapidly, widely used in heavy-duty packaging, construction formwork, load-bearing furniture, and flooring substrates. However, traditional multi-layer hot presses were originally designed for standard thickness panels (9-18mm), with layer spacing typically ranging from 70 to 110mm, unable to meet the following special requirements for thick board production:
Insufficient Loading Space: Thick mats have large forming thickness (typically 3-5 times the final panel thickness), and the layer spacing cannot accommodate the combined thickness of mat and caul plate
Inadequate Compression Stroke: Thick boards require higher compression ratios and longer hot-pressing strokes; conventional presses have limited opening heights
Difficult Heat Transfer: The core layer of thick panels heats up slowly, requiring longer pressing time and higher temperature uniformity
Higher Pressure Demand: While unit pressure for thick boards is similar to thin boards, total pressure demand increases significantly with board thickness
The large layer spacing multi-layer hot press adopts the flat-pressing method. After forming, thick mats (pre-pressed or non-pre-pressed) are simultaneously fed into each layer of the hot press via the loader. The hydraulic system drives the platens to close quickly to the set pressure. Thanks to the enlarged layer spacing, sufficient clearance exists between the loaded mat and the upper platen, ensuring no interference occurs during the initial closing stage. Under high temperature and high pressure, the adhesive inside the mat softens, melts, flows, penetrates, and fully cures, firmly bonding the fibers or particles together. Holding time depends on board thickness (typically 30-90 seconds per mm of thickness) to ensure the core layer reaches the required curing temperature. After holding, the press opens slowly to release pressure, and the unloader synchronously withdraws the finished boards, completing one working cycle.
1. Frame System
Constructed with high-strength steel plate welded frames or large housing structures with enlarged column cross-sections, offering significantly enhanced overall rigidity and bending strength. Stress-optimized specifically for the greater opening forces and longer load-holding durations of thick panel pressing, ensuring stable and reliable operation under long-term high-load conditions.
2. Large Layer Spacing Heated Platen System
Enlarged Layer Spacing: 200-350mm (compared to 70-110mm in conventional presses), providing ample loading space for thick mats
Thickened Platens: Platen thickness ≥100mm (compared to 80-90mm in conventional designs), offering greater heat capacity and bending rigidity to ensure uniform pressure distribution across large-span platens
Platen Dimensions: Standard size 4×8 ft (1220×2440mm), with larger dimensions available for customized thick panel requirements
Temperature Uniformity: Optimized internal flow channel design ensures surface temperature uniformity within ±3°C
3. Long-Stroke Hydraulic System
Large-Diameter Long-Stroke Main Cylinders: Main cylinder diameter ≥Φ320mm with 30%-50% extended stroke, meeting the compression ratio requirements of thick boards (typically 3:1 to 5:1)
Multi-Cylinder Configuration: 4-8 main cylinders depending on tonnage, with total nominal pressure of 1,200-3,600 tons
Slow Pressure Ramping & Precision Holding: Designed for the slow core heating of thick boards, featuring adjustable ramping speed and long-duration precision pressure holding with pressure fluctuation ≤±0.2MPa during holding phase
Proportional Valve + Servo Control: Enables multi-stage pressure curve control (quick closing—low-pressure venting—pressure ramp-up—holding—stepped decompression)
4. Simultaneous Closing Device
Equipped with tie-rod or hinged type simultaneous closing devices to ensure all platens contact the mats simultaneously. Compensators effectively absorb thickness variations between thick mats, ensuring consistent thickness tolerance across every panel. For thick board production, simultaneous closing is particularly critical, preventing mat misalignment and uneven surface pre-cure caused by sequential closing.
5. Heating System
Thermal Oil Heating (Recommended): Offers high heat capacity and precise temperature control, ideal for the extended holding time of thick boards, with maximum working temperature ≤230°C
Steam Heating (Optional): Suitable for processes requiring faster heating rates
Enhanced internal flow channel design improves heat transfer efficiency and reduces core layer heating time
6. Loading and Unloading System
Equipped with heavy-duty loaders and unloaders featuring stronger pushing force and greater lift stroke. Caulless design allows simultaneous feeding of multiple thick mats, reducing auxiliary time.
1. Optimized Large Layer Spacing for Thick Boards
Layer spacing of 200-350mm provides ample clearance for thick mats, preventing interference between mats and platens during pressing, ensuring safe and smooth production.
2. Superior Thick Board Quality
Simultaneous closing eliminates uneven surface pre-cure, significantly improving the density profile uniformity of thick panels. Core layer bonding strength is high, and modulus of rupture and modulus of elasticity are significantly superior to thick boards produced by conventional presses.
3. Powerful Pressure & Stroke Capability
Large-diameter long-stroke cylinders provide sufficient pressure and compression stroke to accommodate thick boards of various thicknesses (25-60mm) and different density grades.
4. Precise Temperature & Pressure Control
Thermal oil heating combined with precision temperature control ensures thorough curing of the thick board core layer. Servo hydraulic system maintains stable pressure during holding, ensuring thickness accuracy within ±0.3mm.
5. High-Efficiency Batch Production of Thick Boards
The multi-layer structure enables batch pressing even for thick boards, producing multiple thick panels per cycle and significantly reducing unit production costs.
6. Rugged & Durable
Heavy-duty frame and thickened platens withstand the high loads of thick board pressing without deformation, ensuring long service life.
Heavy-Duty Packaging: Large transport pallets, crate base panels, equipment packaging boxes
Construction Formwork: High-strength coated formwork for concrete pouring, bridge formwork
Furniture Manufacturing: Heavy-duty furniture components, table tops, countertops, stair treads
Flooring Substrates: Thick laminate flooring substrates, engineered wood flooring core layers
Vehicle Flooring: High-strength panels for truck beds, container flooring
Specialty Wood-Based Panels: Thick MDF, thick particle board, oriented strand board (OSB), and more
Parameter | Specification |
Nominal Pressure | 1,200 - 3,600 tons (customizable) |
Number of Layers | 4 - 15 layers (customizable) |
Layer Spacing | 200 - 350mm (customizable) |
Platen Size | 4×8 ft (1220×2440mm) or customized |
Platen Thickness | ≥100mm |
Main Cylinder Diameter | ≥Φ320mm |
Main Cylinder Stroke | Extended type (matched to layer spacing) |
Finished Panel Thickness Range | 25 - 60mm (expandable to 80mm) |
Hot Pressing Temperature | ≤230°C |
Platen Unit Pressure | 1.5 - 3.0 MPa |
Holding Time | 30 - 90 s/mm thickness |
Heating Medium | Thermal Oil (preferred) / Steam |
Control System | PLC + Touchscreen (fully automatic) |
Platen Temperature Uniformity | ≤±3°C |
Thickness Tolerance | ≤±0.3mm |
Note: Specifications can be customized according to customer requirements.
For more information, welcome contact us, we will reply you quickly and offer working videos with you.
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
