MH-CHP
MINGHUNG
This product is a High‑strength OSB Continuous Press with Directional Pressing System, specially designed for large‑scale, continuous, high‑strength production of oriented strand board (OSB). The equipment combines advanced continuous flat‑pressing technology with a unique directional pressing system, enabling directional pressure application on the mat during travel. This significantly enhances the mechanical properties of OSB panels, especially the balance of strength in longitudinal and transverse directions and overall structural stability.
Oriented Strand Board (OSB) is a high-strength structural wood-based panel made from small-diameter and fast-growing wood, produced through orientation and continuous hot pressing. The continuous press is the core equipment of an OSB production line, directly determining the panel’s mechanical properties, dimensional accuracy, and output. This product innovatively combines continuous flat-pressing technology with a directional pressing system, enabling oriented pressure control during mat pressing. It is an ideal solution for producing high-strength OSB, especially grades OSB/3 and OSB/4.
The high-strength OSB continuous press (directional pressing system) mainly consists of the following systems:
1. High-strength Frame and Framework System
Optimized closed welded frames using finite element analysis, integrally welded from high-strength steel plates, offering extremely high rigidity and fatigue resistance. Frames are arranged at equal spacing and connected by pre-tensioned tie rods, capable of withstanding working pressures up to 10 MPa and thermal expansion compensation. Guide rails on both sides of the frame ensure smooth and precise vertical movement of the upper platen.
2. Directional Pressing System (Core Innovation)
Traditional continuous presses provide only uniform pressure perpendicular to the mat surface. This equipment adds a horizontal component force control system on top of conventional vertical pressing. Multiple independently adjustable pressing modules are arranged beneath the upper platen. Each module contains a hydraulic cylinder and a swing mechanism. Depending on the strand orientation (surface layers longitudinal, core layer transverse, or specific angles), the angle between the resultant force direction and the platen surface (adjustable 0°–30°) can be changed. This applies directional shear and compaction during mat travel, significantly enhancing inter-strand interlocking and bonding strength, thus improving mechanical properties in the target direction. The directional pressing system is linked with the PLC to automatically switch pressing strategies according to the target panel grade.
3. Steel Belt and Drive System
Upper and lower high-strength heat-resistant steel belts (thickness 2–2.5 mm, width 4–9 ft) respectively loop around the upper and lower hot platen assemblies, running cyclically to clamp and convey the OSB mat through the press. The steel belts are tensioned hydraulically and equipped with three-dimensional deviation correction devices, ensuring stable operation with misalignment <5 mm. The drive system uses high‑torque DC or AC variable‑frequency motors with dual drive rollers, achieving maximum operating speeds up to 2500 mm/s.
4. Hot Platens and Heating System
The hot platens are made of forged steel blocks with deep‑hole drilling for thermal oil channels, precision ground to a flatness ≤0.15 mm and surface roughness Ra≤3.2 μm. Along the press length, 12–20 independent temperature control zones are provided, each with its own thermal oil circulation loop and temperature sensor, temperature difference controlled within ±2 °C. Auxiliary temperature regulation channels in the width direction ensure uniform platen surface temperature.
5. Hydraulic and Servo Control System
The hydraulic system uses servo-proportional valves. The total number of hydraulic cylinders is configured according to press width and length (typically 80–200 cylinders). Each cylinder can independently adjust pressure, with response time ≤15 ms and pressure control accuracy ±0.2 bar. In the directional pressing modules, miniature servo cylinders adjust pressing angle and additional lateral forces. The system supports pressure curve programming, allowing real‑time pressure distribution adjustment based on mat density variations.
6. Precision Thickness Control System
Multiple high‑precision laser displacement sensors (accuracy ±0.02 mm) are installed at the press outlet and middle sections to provide real‑time thickness feedback. The control system combines longitudinal zone pressure regulation with transverse micro‑adjustment, keeping thickness tolerance stably within ±0.1 mm. For extra‑thick boards (≥30 mm), a “stepped pressing” mode can be activated to avoid insufficient core densification.
7. Intelligent Control System
Equipped with an industrial PC‑based PLC control system, featuring an HMI touch screen and remote I/O stations. The system contains a dedicated OSB process database (covering different wood species, strand geometries, resin content, target density, etc.), allowing one‑click recall or automatic optimization of process curves.
The working principle of the high‑strength OSB continuous press with directional pressing system can be summarized as: During continuous hot pressing, both vertical pressure and directional horizontal component forces are applied to the mat, enabling oriented strands to achieve better compaction and bonding while maintaining their original orientation.
The detailed process is as follows:
1. Mat Forming and Preheating
After drying and resin application, OSB strands are formed by directional forming machines into three‑layer or five‑layer structures: surface strands aligned parallel to the production line direction (longitudinal), core strands aligned perpendicular (transverse) or at specific angles. The mat is lightly pre‑compacted by pre‑press rollers and enters the press infeed, where infrared preheating devices raise the mat surface temperature to 80–100 °C.
2. Infeed Guiding and Degassing
After entering the press, the mat first passes through a flexible infeed mechanism that automatically adjusts the opening according to mat thickness. Multiple degassing rollers gradually remove air from inside the mat to prevent bubbles or delamination during hot pressing.
3. Directional Pressing Process
The mat travels clamped between the steel belts and passes through three functional zones:
Preheating and compaction zone (approx. 20% of length): Low pressure (2–4 MPa) preheating raises the mat temperature above 120 °C, softening the adhesive.
Directional pressing zone (core zone, approx. 50% of length): Vertical pressure increases to 6–10 MPa, and the directional pressing system is activated. According to strand orientation, the pressing modules beneath the upper platen generate horizontal component forces either parallel or perpendicular to the production line (maximum lateral force up to 30% of vertical pressure). This process further slips and compacts the longitudinal surface strands, laterally compresses the transverse core strands, significantly increasing inter‑strand contact area and mechanical interlocking, thereby improving modulus of elasticity (MOE) and modulus of rupture (MOR).
Thickness calibration and curing zone (approx. 30% of length): Pressure gradually reduces to 2–3 MPa, temperature maintained at 180–220 °C, allowing full adhesive curing while precisely controlling final thickness and density profile.
4. Cooling and Outfeed
After exiting the press, the board passes through forced air cooling or water‑cooled roller tables, reducing temperature below 80 °C to relieve internal stresses. A transverse flying saw cuts the board to specified lengths before stacking.
Parameter | Specification Range |
Press length | 25 – 50 m (customizable) |
Press width | 4 – 9 ft (approx. 1.22–2.74 m) |
Finished board thickness | 6 – 40 mm (extendable to 50 mm) |
Finished board width | 1220 – 2800 mm |
Finished board length | 2440 – 6000 mm (any custom length) |
Operating speed | 500 – 2500 mm/s |
Daily capacity | 400 – 1200 m³ |
Annual capacity (330 days) | 130,000 – 400,000 m³ |
Board density range | 550 – 850 kg/m³ |
Max vertical working pressure | 10 MPa |
Max lateral component force (directional pressing) | 30% of vertical pressure |
Pressing angle adjustment range | 0° – 30° (angle from vertical) |
Hot platen temperature | 160 – 230 °C (12–20 independent zones) |
Temperature control accuracy | ±2 °C |
Thickness control accuracy | ±0.1 mm |
Longitudinal/transverse MOE ratio | 1:1.5 – 1:2.5 (adjustable) |
Installed power | 3000 – 6000 kW |
Heating method | Thermal oil (mainstream) / steam / electric heating |
Note: The above parameters can be customized according to customer raw materials and product requirements.
1. Significantly improved OSB mechanical properties
The directional pressing system greatly improves the longitudinal/transverse strength ratio, increasing MOE and MOR by 15%–30% compared to conventional continuous presses, especially suitable for OSB/3 and OSB/4 structural grades.
2. Reduced strand consumption and lower cost
Higher compaction efficiency allows achieving the same strength grade with 5%–10% lower board density, saving wood raw material and adhesive, reducing overall cost by approximately 8%–12%.
3. Tight thickness tolerance and flat surface
±0.1 mm thickness control accuracy allows the product to be directly used for high‑requirement laminating or grooving, reducing sanding and increasing yield.
4. High production flexibility
Quick changeover between different thicknesses (6–40 mm), densities (550–850 kg/m³), and strength grades; changeover time less than 30 minutes.
5. Intelligent and traceable
Full‑process data recording and adaptive process control ensure consistent quality for each panel, meeting certification requirements for structural building materials (e.g., EN 300, PS 2, etc.).
6. Energy‑efficient and environmentally friendly
Optimized thermal oil circulation and insulation design reduce heat consumption per unit product by 12%–18%; enclosed exhaust collection system reduces VOC emissions.
Structural‑grade OSB production: OSB/3, OSB/4 grades for load‑bearing components such as timber frame houses, I‑joists, beams, trusses.
Container flooring: Heavy‑duty panels requiring high strength, high bending resistance, and weather resistance.
Industrial packaging: Export crates and pallets for heavy machinery and precision instruments.
Concrete formwork: High‑reuse formwork for concrete pouring.
Automotive industry: Truck flooring, van side panels.
High‑end furniture and shelving: Shelves and table substrates requiring high load‑bearing capacity.
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
