MH-OSB
MINGHUNG
A complete OSB production line is a highly automated system engineering project, mainly comprising the following core machinery:
1. Raw Material Preparation Section:
Stranders (Longwood Flakers): Core equipment. Processes logs, small-diameter wood, branches, etc., directly into narrow, long strands of specified dimensions. It is key to ensuring strand morphology quality.
Strand Screening and Classification System: Recrushes oversized strands and grades them by size via multi-deck screens, separating fine surface-layer material from coarse core-layer material.
2. Drying, Blending, and Storage Section:
Rotary Drum Dryer: Dries the classified strands efficiently and uniformly using high-temperature hot air, precisely controlling moisture content to the process range of 2-4%.
Ring Blender: Uniformly mixes the dried strands with adhesive (typically PMDI isocyanate or MUF melamine-urea-formaldehyde resin) and wax emulsion in a high-speed rotating blender. The excellent waterproofing of PMDI is key to achieving low swelling.
Blended Strand Bins: Store the resin-coated surface and core layer strands, providing a buffer for continuous forming.
dryer
glue sizing system
3. Forming and Pressing Section (Heart of the Line):
Oriented Forming Station: The soul of OSB production. Typically uses multiple forming heads (e.g., 4 heads). Uses dedicated mechanical disc rollers or electrostatic orientation systems to make surface strands orient along the mat length (longitudinal direction) and core strands orient along the mat width (transverse direction), creating a cross-oriented structure that gives OSB its high mechanical properties.
Continuous Press (CP): The hallmark of a modern high-output line. The oriented mat, coated with resin, is continuously conveyed through a heating and pressing zone dozens of meters long by steel belts, curing under precisely controlled temperature (200-220°C) and pressure profiles. Its production efficiency, quality uniformity, and surface quality far exceed those of traditional multi-opening presses.
mat forming machine
continuous hot press
4. Finishing and Sanding/Cutting Section:
Cooling and Flipping Unit: Cools and flips the high-temperature boards (>180°C) after pressing to balance moisture content and internal stress, preventing warping.
Cross-Cut and Trim Saws: Precisely cut the continuous board strand into required panel sizes (e.g., standard 4x8 feet / 1220x2440mm).
Stacking and Conditioning System: Automated stacking provides sufficient conditioning time for the boards to stabilize their properties fully.
Sanding Machine: Finely sands the board surface to remove the pre-cured layer and thickness deviations, achieving a uniform and smooth surface.
dryer rack
cross-cut saw
sander
5. Auxiliary Systems:
Thermal Energy Center (TEC): Uses process waste (bark, fines, sander dust) as fuel to generate thermal energy for the dryer and press, achieving significant energy self-sufficiency and reducing consumption.
Central Control System (PLC + SCADA): The "brain" of across the board automation, monitoring and adjusting all process parameters in real-time to ensure stable production and traceable product quality.
energy center
plc
The OSB production process revolves around the core feature of "orientation":
1. Stranding and Screening: Wood raw material is processed into strands of specified size by stranders, then screened and classified by size.
2. Drying: Different grades of strands are dried separately to the target moisture content.
3. Blending: Dried strands are uniformly mixed with PMDI/MUF adhesive and wax emulsion in the blender.
4. Oriented Forming: Resin-coated strands are formed into a mat with a oriented structure (longitudinal surface layers, transverse core layer) via the oriented forming station.
5. Pre-Pressing and Hot Pressing: The mat is initially compacted by a pre-press, then cured under high temperature and pressure in the continuous press.
6. Cooling and Cutting: The pressed board strand is cooled and then cut to the required dimensions.
7. Conditioning and Sanding: The cut panels are stacked for conditioning, and finally sanded to obtain the finished product.
What Does Swelling Coefficient Mean?
The Swelling Coefficient here specifically refers to "Thickness Swell".
It is the increase in thickness of a panel after absorption of water under specified conditions (typically immersing a sample in water for 24 hours), expressed as a percentage of the original thickness before immersion.
It is the most critical indicator for measuring the water resistance and dimensional stability of wood-based panels, especially OSB and particleboard.
A lower swelling coefficient indicates the panel's stronger ability to resist water absorption, swelling, and deformation in humid environments, signifying superior quality.
How is Low Thickness Swell Achieved?
Achieving low thickness swell in OSB is a systematic project that relies on the perfect combination of materials, equipment, and process:
1. Using Highly Water-Resistant Adhesives: Using PMDI (Isocyanate) adhesive is key. PMDI not only has extremely high bond strength, but the cured adhesive film itself is water-insoluble and forms strong chemical bonds with wood molecules, effectively preventing water intrusion and fundamentally reducing swelling caused by adhesive hydrolysis.
2. Adding Efficient Water Repellents: Wax emulsion is applied simultaneously during blending. Wax particles melt during hot pressing and coat the strand surfaces, forming a hydrophobic physical barrier that effectively hinders water penetration.
3. Optimized Pressing Process: A precisely controlled pressing profile (temperature, pressure, time) ensures complete curing of the adhesive, forming a dense and stable mat structure that reduces internal voids capable of absorbing water.
4. High-Quality Strands and Oriented Structure: Uniform strand morphology and a clear oriented structure result in a tighter internal mat structure, reducing water penetration paths. Meanwhile, strong internal bond strength can resist the swelling stress generated after water ingress.
Main Applications
Due to their exceptional stability and durability, low thickness swell OSB is used in applications with extremely high requirements for weather resistance and load-bearing capacity:
1. Wood Frame Construction:
Roof Sheathing: Used as load-bearing roof sheathing, must withstand temperature differences and moisture changes without warping or deformation.
Wall Sheathing: Used as sheathing over wall studs, ensuring flat and stable walls and providing racking strength to the structure.
Flooring: Used as subflooring, requiring extremely high load-bearing capacity and resistance to deformation.
2. Humid Environment Applications:
Container Flooring: Used for flooring in freight containers and truck trailers, needing to withstand the harsh tests of global climatic conditions.
Concrete Formwork: Used as permanent or reusable concrete formwork, must resist the moisture and alkalinity of wet cement.
Outdoor Temporary Structures & Packaging: Used for outdoor temporary facilities and heavy-duty industrial packaging requiring some weather resistance.
3. High-End Furniture and Decoration:
Substrate for Kitchen/Bathroom Furniture: Used for cabinet boxes in kitchens and vanities, especially in damp bathroom environments.
DIY Market & Decorative Moldings: Used for decorative wall panels and moldings that require painting or direct use, where stability is paramount.
Low Swelling, Superior Moisture Resistance: Achieves outstanding dimensional stability and a very low thickness swelling rate (far superior to EN-300 standards) through core technologies: oriented strand forming, precise wax application, and optimized hot pressing curing profiles. Ideal for humid environments.
High Output & Automation: The line employs a high-efficiency continuous dryer, multi-head orienting formers, and an advanced continuous press (or large-format multi-opening press). Integrated with a PLC central control system, it enables fully automated operation, ensuring stable achievement of the 200 m³/day design capacity.
Precision Strand Orientation: Dedicated mechanical or mechanical-airflow forming heads achieve longitudinal orientation for the surface layers and transverse orientation for the core layer, granting the OSB panels high internal bond strength, bending strength, and dimensional stability.
Energy Efficiency & Sustainability: The line design includes a thermal energy center that fully utilizes process waste (bark, sander dust) as fuel to provide heat for drying and pressing, significantly reducing energy consumption and production costs.
Standardization & Flexibility: The output panels perfectly conform to the internationally standard 4x8 feet size, while the line can also be adjusted to produce OSB boards in other thicknesses (e.g., 9mm to 25mm) based on market demand.
Investors planning to establish or upgrade an OSB plant aimed at producing high-quality, low-swelling OSB boards for markets such as standards, wood frame construction, and high-end packaging and decoration.
We provide a complete turnkey project service from planning, design, manufacturing, installation & commissioning, to technical training, ensuring the success of your project.
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
A complete OSB production line is a highly automated system engineering project, mainly comprising the following core machinery:
1. Raw Material Preparation Section:
Stranders (Longwood Flakers): Core equipment. Processes logs, small-diameter wood, branches, etc., directly into narrow, long strands of specified dimensions. It is key to ensuring strand morphology quality.
Strand Screening and Classification System: Recrushes oversized strands and grades them by size via multi-deck screens, separating fine surface-layer material from coarse core-layer material.
2. Drying, Blending, and Storage Section:
Rotary Drum Dryer: Dries the classified strands efficiently and uniformly using high-temperature hot air, precisely controlling moisture content to the process range of 2-4%.
Ring Blender: Uniformly mixes the dried strands with adhesive (typically PMDI isocyanate or MUF melamine-urea-formaldehyde resin) and wax emulsion in a high-speed rotating blender. The excellent waterproofing of PMDI is key to achieving low swelling.
Blended Strand Bins: Store the resin-coated surface and core layer strands, providing a buffer for continuous forming.
dryer
glue sizing system
3. Forming and Pressing Section (Heart of the Line):
Oriented Forming Station: The soul of OSB production. Typically uses multiple forming heads (e.g., 4 heads). Uses dedicated mechanical disc rollers or electrostatic orientation systems to make surface strands orient along the mat length (longitudinal direction) and core strands orient along the mat width (transverse direction), creating a cross-oriented structure that gives OSB its high mechanical properties.
Continuous Press (CP): The hallmark of a modern high-output line. The oriented mat, coated with resin, is continuously conveyed through a heating and pressing zone dozens of meters long by steel belts, curing under precisely controlled temperature (200-220°C) and pressure profiles. Its production efficiency, quality uniformity, and surface quality far exceed those of traditional multi-opening presses.
mat forming machine
continuous hot press
4. Finishing and Sanding/Cutting Section:
Cooling and Flipping Unit: Cools and flips the high-temperature boards (>180°C) after pressing to balance moisture content and internal stress, preventing warping.
Cross-Cut and Trim Saws: Precisely cut the continuous board strand into required panel sizes (e.g., standard 4x8 feet / 1220x2440mm).
Stacking and Conditioning System: Automated stacking provides sufficient conditioning time for the boards to stabilize their properties fully.
Sanding Machine: Finely sands the board surface to remove the pre-cured layer and thickness deviations, achieving a uniform and smooth surface.
dryer rack
cross-cut saw
sander
5. Auxiliary Systems:
Thermal Energy Center (TEC): Uses process waste (bark, fines, sander dust) as fuel to generate thermal energy for the dryer and press, achieving significant energy self-sufficiency and reducing consumption.
Central Control System (PLC + SCADA): The "brain" of across the board automation, monitoring and adjusting all process parameters in real-time to ensure stable production and traceable product quality.
energy center
plc
The OSB production process revolves around the core feature of "orientation":
1. Stranding and Screening: Wood raw material is processed into strands of specified size by stranders, then screened and classified by size.
2. Drying: Different grades of strands are dried separately to the target moisture content.
3. Blending: Dried strands are uniformly mixed with PMDI/MUF adhesive and wax emulsion in the blender.
4. Oriented Forming: Resin-coated strands are formed into a mat with a oriented structure (longitudinal surface layers, transverse core layer) via the oriented forming station.
5. Pre-Pressing and Hot Pressing: The mat is initially compacted by a pre-press, then cured under high temperature and pressure in the continuous press.
6. Cooling and Cutting: The pressed board strand is cooled and then cut to the required dimensions.
7. Conditioning and Sanding: The cut panels are stacked for conditioning, and finally sanded to obtain the finished product.
What Does Swelling Coefficient Mean?
The Swelling Coefficient here specifically refers to "Thickness Swell".
It is the increase in thickness of a panel after absorption of water under specified conditions (typically immersing a sample in water for 24 hours), expressed as a percentage of the original thickness before immersion.
It is the most critical indicator for measuring the water resistance and dimensional stability of wood-based panels, especially OSB and particleboard.
A lower swelling coefficient indicates the panel's stronger ability to resist water absorption, swelling, and deformation in humid environments, signifying superior quality.
How is Low Thickness Swell Achieved?
Achieving low thickness swell in OSB is a systematic project that relies on the perfect combination of materials, equipment, and process:
1. Using Highly Water-Resistant Adhesives: Using PMDI (Isocyanate) adhesive is key. PMDI not only has extremely high bond strength, but the cured adhesive film itself is water-insoluble and forms strong chemical bonds with wood molecules, effectively preventing water intrusion and fundamentally reducing swelling caused by adhesive hydrolysis.
2. Adding Efficient Water Repellents: Wax emulsion is applied simultaneously during blending. Wax particles melt during hot pressing and coat the strand surfaces, forming a hydrophobic physical barrier that effectively hinders water penetration.
3. Optimized Pressing Process: A precisely controlled pressing profile (temperature, pressure, time) ensures complete curing of the adhesive, forming a dense and stable mat structure that reduces internal voids capable of absorbing water.
4. High-Quality Strands and Oriented Structure: Uniform strand morphology and a clear oriented structure result in a tighter internal mat structure, reducing water penetration paths. Meanwhile, strong internal bond strength can resist the swelling stress generated after water ingress.
Main Applications
Due to their exceptional stability and durability, low thickness swell OSB is used in applications with extremely high requirements for weather resistance and load-bearing capacity:
1. Wood Frame Construction:
Roof Sheathing: Used as load-bearing roof sheathing, must withstand temperature differences and moisture changes without warping or deformation.
Wall Sheathing: Used as sheathing over wall studs, ensuring flat and stable walls and providing racking strength to the structure.
Flooring: Used as subflooring, requiring extremely high load-bearing capacity and resistance to deformation.
2. Humid Environment Applications:
Container Flooring: Used for flooring in freight containers and truck trailers, needing to withstand the harsh tests of global climatic conditions.
Concrete Formwork: Used as permanent or reusable concrete formwork, must resist the moisture and alkalinity of wet cement.
Outdoor Temporary Structures & Packaging: Used for outdoor temporary facilities and heavy-duty industrial packaging requiring some weather resistance.
3. High-End Furniture and Decoration:
Substrate for Kitchen/Bathroom Furniture: Used for cabinet boxes in kitchens and vanities, especially in damp bathroom environments.
DIY Market & Decorative Moldings: Used for decorative wall panels and moldings that require painting or direct use, where stability is paramount.
Low Swelling, Superior Moisture Resistance: Achieves outstanding dimensional stability and a very low thickness swelling rate (far superior to EN-300 standards) through core technologies: oriented strand forming, precise wax application, and optimized hot pressing curing profiles. Ideal for humid environments.
High Output & Automation: The line employs a high-efficiency continuous dryer, multi-head orienting formers, and an advanced continuous press (or large-format multi-opening press). Integrated with a PLC central control system, it enables fully automated operation, ensuring stable achievement of the 200 m³/day design capacity.
Precision Strand Orientation: Dedicated mechanical or mechanical-airflow forming heads achieve longitudinal orientation for the surface layers and transverse orientation for the core layer, granting the OSB panels high internal bond strength, bending strength, and dimensional stability.
Energy Efficiency & Sustainability: The line design includes a thermal energy center that fully utilizes process waste (bark, sander dust) as fuel to provide heat for drying and pressing, significantly reducing energy consumption and production costs.
Standardization & Flexibility: The output panels perfectly conform to the internationally standard 4x8 feet size, while the line can also be adjusted to produce OSB boards in other thicknesses (e.g., 9mm to 25mm) based on market demand.
Investors planning to establish or upgrade an OSB plant aimed at producing high-quality, low-swelling OSB boards for markets such as standards, wood frame construction, and high-end packaging and decoration.
We provide a complete turnkey project service from planning, design, manufacturing, installation & commissioning, to technical training, ensuring the success of your project.
Whatsapp: +8618769900191 +8615589105786 +8618954906501
Email: osbmdfmachinery@gmail.com
