MH
MINGHUNG
A 250, 000 cubic meters per year Formaldehyde-Free MDF (Medium Density Fiberboard) production line is a highly automated and technology-intensive complete system. Its core technology involves using formaldehyde-free adhesives (such as MDI - isocyanate glue), which imposes special requirements on equipment and processes. The main equipment is as follows:
1. Raw Material Handling Section
Chipper: Processes logs, branches, or wood chunks into uniform process chips.
Chip Screen & Re-crusher: Screens the chips; qualified chips proceed, oversized chips are re-crushed, and contaminants are removed.
Chip Storage Bin: Stores and buffers chips to ensure continuous and stable production.
wood chipping machine
vibrating screen
stock bin
2. Fiber Preparation Section (Core Section)
Preheating & Digester: Softens and preheats the wood chips.
Defibrator (Refiner): One of the core pieces of equipment. Separates wood chips into wood fibers under high temperature and pressure.
Glue & Wax Blending System: Key equipment for the formaldehyde-free line. Includes:
MDI Storage & Supply System: MDI is moisture-sensitive, requiring dedicated insulated (~40°C) and moisture-proof storage tanks and precise delivery systems.
High-Precision Metering Pumps & Atomizing Injection System: Precisely meters and atomizes MDI glue, then injects it into the fiber pipeline at the defibrator outlet for thorough mixing with fibers. This system must be chemically resistant and clog-free.
Wax System: Adds wax to improve the board's water resistance.
Fiber Drying System: Another key aspect for formaldehyde-free production. Since MDI reacts prematurely with water, a Single-Pass Drying System (Single-Stage Dryer) must be used, different from the two-pass dryer used with aldehyde glue, to prevent adhesive curing inside the pipes. The moisture content of dried fibers must be precisely controlled.
defibrator
gluing machine
MDF fiber drying machine
3. Mat Forming Section
Fiber Metering Bin: Stores dried fibers, providing buffering and metering.
Mechanical or Pneumatic Forming Station: Evenly distributes fibers to form a continuous, consistent-thickness "fiber mat." Forming uniformity directly affects the density distribution and thickness tolerance of the finished board.
4. Pressing & Curing Section
Pre-press: Initially compacts the fluffy "fiber mat" to increase strength for transportation and remove internal air.
Continuous Press: The core and most valuable equipment of the entire production line. The formed mat is fed into the press via a continuously moving steel belt, where it is continuously pressed into boards of the required thickness under set temperature, pressure, and speed. Compared to batch presses, continuous presses offer extremely high production efficiency, more uniform board density, and more stable quality. This is the key technology enabling the annual production capacity of 250, 000 m³.
MDF pre press machine
continuous hot press
5. Finishing & Processing Section
Cooling Star & Turner: Cools and homogenizes the high-temperature boards exiting the press to prevent deformation.
Cross-Cut & Trim Saws: Cuts the continuous board strip into required standard sizes.
Sanding Line: Crucially important. Sands the board surfaces to a calibrated thickness, eliminating press deviations and pre-cured layers, ensuring precise thickness and a smooth, flat surface ready for direct lamination.
Stacking & Packaging System: Automatically stacks, inspects, and packages the finished boards.
dryer rack
cross-cut saw
MDF sanding machine
6. Auxiliary & Support Systems
Energy Plant/Heating Plant: Provides heat required for production (drying, pressing), typically fueled by production waste like bark and sander dust, making it energy-efficient and eco-friendly.
Dust Extraction System: Collects dust generated in various processes, ensuring workshop cleanliness and operational safety.
Central Control System (DCS/PLC): The brain of the production line. A computer-based Distributed Control System automates control of production parameters (temperature, pressure, speed, metering, etc.) throughout the process, ensuring production stability and consistent product quality.
Quality Control Laboratory: Equipped with instruments (e.g., universal testing machine, internal bond tester, formaldehyde chamber) for online and offline testing of physical/mechanical properties and environmental indicators of the product.
energy center
siemens PLC
The production of 18mm Formaldehyde-Free MDF (Medium Density Fiberboard) is a highly automated, technology-intensive, and continuous process. Its core lies in using formaldehyde-free adhesives (such as MDI - isocyanate) and ensuring the board achieves the predetermined physical-mechanical properties and environmental standards. Below is the detailed production process:
1. Raw Material Preparation & Handling
Chipping: Logs, small-diameter wood, or wood residues (e.g., branches, slabs) are fed into a chipper to be processed into uniform wood chips that meet process requirements.
Screening & Washing: The chips are screened by a chip screen to remove oversized chips (which are sent for re-crushing), fine particles, and impurities (e.g., sand, metal), ensuring only clean, uniform chips proceed to the next stage.
2. Fiber Preparation (Core Section)
Preheating & Steaming: Qualified chips are sent to a preheating/digester bin where they are softened and preheated with saturated steam, making the fiber structure easier to separate.
Defibration/Refining: The softened chips are metered into a defibrator (refiner). Under high temperature and pressure, the chips are frictionally separated into fine wood fibers.
Formaldehyde-Free Resin Application (Critical Step): At the outlet pipeline of the defibrator, the formaldehyde-free adhesive (MDI) is evenly applied to the dispersed fibers through a precise metering and atomizing injection system. Since MDI is sensitive to moisture, this system must be precisely moisture-proof and chemically resistant. Simultaneously, wax emulsion is added to enhance the board's water resistance.
3. Fiber Drying
Single-Stage Drying: Because MDI glue reacts and cures prematurely upon contact with liquid water, a single-pass drying system must be used. The wet fibers are conveyed at high speed through a drying pipe by hot air, rapidly evaporating the moisture. The moisture content of the dried fibers is precisely controlled between 8%-12%. This is a fundamental difference from the two-stage drying system used with aldehyde resins.
4. Mat Forming & Pre-pressing
Forming: The dried fibers are distributed by a mechanical or pneumatic forming station onto a moving steel belt to form a continuous "fiber mat" with consistent thickness and a slightly higher density in the middle than at the edges. The uniformity of forming directly determines the density distribution and thickness deviation of the finished board.
Pre-pressing: The fluffy fiber mat then passes through a pre-press, where it is initially compacted into a blank with certain strength. This process removes internal air, reduces thickness, facilitates transportation, and prevents the mat from being blown apart when entering the main press.
5. Hot Pressing & Curing (Core Forming Section)
Continuous Hot Pressing: The mat is fed into a continuous press—the core equipment of the production line. The mat passes under a continuously moving, heated steel belt where, under set temperature , pressure , and speed, the MDI adhesive rapidly polymerizes, and the wood fibers are permanently bonded under heat and pressure. The continuous press precisely controls the 18mm thickness and ensures extremely uniform board density with smooth surfaces on both sides.
Mat Tracking & Quality Control: An advanced control system monitors and adjusts the pressure and temperature in different zones of the press in real-time, ensuring every part of the board achieves optimal performance.
6. Finishing & Processing
Cooling & Conditioning: The board exiting the press is very hot (over 100°C) and must immediately enter a cooling star and turnover device for forced cooling. This stabilizes the internal structure, prevents deformation, and reduces internal stress.
Trimming & Cutting: The cooled continuous board strip is precisely cut to standard sizes (e.g., 1220mm x 2440mm or 1830mm x 3660mm) by high-speed cross-cut and trim saws, and the rough edges are trimmed off.
Sanding: This is a critical step for ensuring the final product quality. The board passes through a wide-belt calibrating sander with multiple heads (e.g., 6-8 heads) to remove the pre-cured layer, correct minor thickness deviations, and achieve a highly smooth, flat surface ready for subsequent lamination, printing, or direct use.
7. Inspection & Packaging
Quality Inspection: Samples from the finished boards are tested for key indicators including: thickness tolerance, density, Modulus of Rupture (MOR), Modulus of Elasticity (MOE), Internal Bond (IB) strength, thickness swelling upon water absorption, and formaldehyde emission (confirmed to meet formaldehyde-free standards using the chamber method).
Stacking & Packaging: Qualified boards are stacked neatly by an automatic stacker, covered with protective film, secured with strapping, and labeled with specifications, production date, environmental grade etc., before being stored or shipped.
This 250, 000 cubic meters per year NAF (No-Added-Formaldehyde) MDF production line represents the pinnacle of technology, environmental protection, and profitability. Its core advantages are:
1. Cutting-Edge Eco-Technology, Defining New Health Standards
Formaldehyde-Free Core: Uses MDI (isocyanate) or other NAF adhesives, eliminating formaldehyde at the source. Formaldehyde emissions from finished boards are undetectable, far exceeding the world's strictest standards like CARB NAF and EPA NAF.
Green Production: Thermal energy is largely generated by burning wood waste (bark, sander dust) in an energy plant, enabling a circular economy and reducing carbon footprint.
2. High Automation & Intelligence, Ensuring Quality & Efficiency
Foundation for a "Dark Factory": The entire line is automated by a central DCS/PLC control system, with minimal human intervention from chipping to stacking. Ensures high production efficiency and stable annual capacity of 250, 000 m³.
Consistent Quality: Precise metering, blending, forming, and an intelligent continuous press guarantee extremely uniform density distribution, stable physical properties, and minimal thickness deviation in every 18mm board.
Traceability: Production parameters are monitored and recorded in real-time, allowing any quality issue to be traced back to the production batch and exact time.
3. Advanced Process Design, Optimized for NAF Production
Dedicated Blending System: Equipped with chemical-resistant, clog-resistant MDI-specific metering and atomizing injection systems for uniform resin distribution.
Single-Stage Drying: A unique single-pass dryer is employed to prevent MDI pre-curing upon contact with water, a critical process difference from conventional aldehyde-resin lines.
4. Superior Economics & Scale Benefits
Economies of Scale: The 250, 000 m³/year capacity offers significant unit cost advantages and strong market competitiveness.
High Yield: The advanced continuous press and sander line minimize waste and defects, maximizing material utilization.
High-Value Product: Produces premium-priced NAF boards that meet consumer upgrade trends, offering far greater profit margins than standard E-grade boards.
The 18mm thickness is the "sweet spot" for load-bearing and structural strength. Combined with its healthy NAF properties, this board is the material of choice for high-end applications:
1. High-End Home & Custom Furniture
Applications: Shelves and side panels for premium wardrobes/bookcases; substrate for tabletops (dining, desk); entire construction of children's furniture.
Reasons: The 18mm thickness provides excellent MOR (bending strength) and load-bearing capacity, ensuring sturdy, durable furniture resistant to warping. The NAF characteristic ensures a safe home environment for sensitive groups like children and the elderly.
2. Commercial & Public Space Decoration
Applications: Partitions, wall panels, display shelves, and service counter structures in hotels, offices, malls, and schools.
Reasons: Meets the high demands of commercial spaces for durability and fire resistance (when combined with fire-rated veneers). The NAF property guarantees indoor air quality (IAQ) in densely occupied environments and complies with green building certifications .
3. Specialty Demand Sectors
Applications: Furniture, cabinets, and interior décor in medical facilities; laboratory casework; storage cabinets in the food industry.
Reasons: These sectors have extremely stringent requirements for hygiene and safety. NAF MDF completely eliminates a source of formaldehyde pollution, making it a necessity.
4. Electronics, Luxury Retail & High-End Packaging
Applications: Back panels and structural components for high-end electronics (TVs, audio systems); display cases and podiums in luxury stores; packaging inserts for precision instruments.
Reasons: The 18mm thickness provides robust support and protection. The NAF characteristic prevents potential damage from VOCs to sensitive electronics or valuable goods.
5. DIY & Creative Home Projects
Applications: Making shelves, workbenches, and creative furniture in home workshops.
Reasons: Easy to cut, carve, and finish (laminate, paint, print). Its eco-friendly and safe nature gives DIY enthusiasts peace of mind.
Shandong MINGHUNG OSB&MDF Machinery Equipment Manufacturing Co.,Ltd. was founded in 1983, specializes in continuous press solutions for over 40 years.
MINGHUNG is a leading company in the industry of OSB&MDF making machine. With a strongfocus on producing high-quality machinery, we specialize in manufacturing thecomplete production line of Medium density fiberboard (MDF), High densityfiberboard (HDF),Particle board (PB), Oriented strand board (OSB) , Veneerable super strong particle board (LSB),Laminated board and veneer.
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
A 250, 000 cubic meters per year Formaldehyde-Free MDF (Medium Density Fiberboard) production line is a highly automated and technology-intensive complete system. Its core technology involves using formaldehyde-free adhesives (such as MDI - isocyanate glue), which imposes special requirements on equipment and processes. The main equipment is as follows:
1. Raw Material Handling Section
Chipper: Processes logs, branches, or wood chunks into uniform process chips.
Chip Screen & Re-crusher: Screens the chips; qualified chips proceed, oversized chips are re-crushed, and contaminants are removed.
Chip Storage Bin: Stores and buffers chips to ensure continuous and stable production.
wood chipping machine
vibrating screen
stock bin
2. Fiber Preparation Section (Core Section)
Preheating & Digester: Softens and preheats the wood chips.
Defibrator (Refiner): One of the core pieces of equipment. Separates wood chips into wood fibers under high temperature and pressure.
Glue & Wax Blending System: Key equipment for the formaldehyde-free line. Includes:
MDI Storage & Supply System: MDI is moisture-sensitive, requiring dedicated insulated (~40°C) and moisture-proof storage tanks and precise delivery systems.
High-Precision Metering Pumps & Atomizing Injection System: Precisely meters and atomizes MDI glue, then injects it into the fiber pipeline at the defibrator outlet for thorough mixing with fibers. This system must be chemically resistant and clog-free.
Wax System: Adds wax to improve the board's water resistance.
Fiber Drying System: Another key aspect for formaldehyde-free production. Since MDI reacts prematurely with water, a Single-Pass Drying System (Single-Stage Dryer) must be used, different from the two-pass dryer used with aldehyde glue, to prevent adhesive curing inside the pipes. The moisture content of dried fibers must be precisely controlled.
defibrator
gluing machine
MDF fiber drying machine
3. Mat Forming Section
Fiber Metering Bin: Stores dried fibers, providing buffering and metering.
Mechanical or Pneumatic Forming Station: Evenly distributes fibers to form a continuous, consistent-thickness "fiber mat." Forming uniformity directly affects the density distribution and thickness tolerance of the finished board.
4. Pressing & Curing Section
Pre-press: Initially compacts the fluffy "fiber mat" to increase strength for transportation and remove internal air.
Continuous Press: The core and most valuable equipment of the entire production line. The formed mat is fed into the press via a continuously moving steel belt, where it is continuously pressed into boards of the required thickness under set temperature, pressure, and speed. Compared to batch presses, continuous presses offer extremely high production efficiency, more uniform board density, and more stable quality. This is the key technology enabling the annual production capacity of 250, 000 m³.
MDF pre press machine
continuous hot press
5. Finishing & Processing Section
Cooling Star & Turner: Cools and homogenizes the high-temperature boards exiting the press to prevent deformation.
Cross-Cut & Trim Saws: Cuts the continuous board strip into required standard sizes.
Sanding Line: Crucially important. Sands the board surfaces to a calibrated thickness, eliminating press deviations and pre-cured layers, ensuring precise thickness and a smooth, flat surface ready for direct lamination.
Stacking & Packaging System: Automatically stacks, inspects, and packages the finished boards.
dryer rack
cross-cut saw
MDF sanding machine
6. Auxiliary & Support Systems
Energy Plant/Heating Plant: Provides heat required for production (drying, pressing), typically fueled by production waste like bark and sander dust, making it energy-efficient and eco-friendly.
Dust Extraction System: Collects dust generated in various processes, ensuring workshop cleanliness and operational safety.
Central Control System (DCS/PLC): The brain of the production line. A computer-based Distributed Control System automates control of production parameters (temperature, pressure, speed, metering, etc.) throughout the process, ensuring production stability and consistent product quality.
Quality Control Laboratory: Equipped with instruments (e.g., universal testing machine, internal bond tester, formaldehyde chamber) for online and offline testing of physical/mechanical properties and environmental indicators of the product.
energy center
siemens PLC
The production of 18mm Formaldehyde-Free MDF (Medium Density Fiberboard) is a highly automated, technology-intensive, and continuous process. Its core lies in using formaldehyde-free adhesives (such as MDI - isocyanate) and ensuring the board achieves the predetermined physical-mechanical properties and environmental standards. Below is the detailed production process:
1. Raw Material Preparation & Handling
Chipping: Logs, small-diameter wood, or wood residues (e.g., branches, slabs) are fed into a chipper to be processed into uniform wood chips that meet process requirements.
Screening & Washing: The chips are screened by a chip screen to remove oversized chips (which are sent for re-crushing), fine particles, and impurities (e.g., sand, metal), ensuring only clean, uniform chips proceed to the next stage.
2. Fiber Preparation (Core Section)
Preheating & Steaming: Qualified chips are sent to a preheating/digester bin where they are softened and preheated with saturated steam, making the fiber structure easier to separate.
Defibration/Refining: The softened chips are metered into a defibrator (refiner). Under high temperature and pressure, the chips are frictionally separated into fine wood fibers.
Formaldehyde-Free Resin Application (Critical Step): At the outlet pipeline of the defibrator, the formaldehyde-free adhesive (MDI) is evenly applied to the dispersed fibers through a precise metering and atomizing injection system. Since MDI is sensitive to moisture, this system must be precisely moisture-proof and chemically resistant. Simultaneously, wax emulsion is added to enhance the board's water resistance.
3. Fiber Drying
Single-Stage Drying: Because MDI glue reacts and cures prematurely upon contact with liquid water, a single-pass drying system must be used. The wet fibers are conveyed at high speed through a drying pipe by hot air, rapidly evaporating the moisture. The moisture content of the dried fibers is precisely controlled between 8%-12%. This is a fundamental difference from the two-stage drying system used with aldehyde resins.
4. Mat Forming & Pre-pressing
Forming: The dried fibers are distributed by a mechanical or pneumatic forming station onto a moving steel belt to form a continuous "fiber mat" with consistent thickness and a slightly higher density in the middle than at the edges. The uniformity of forming directly determines the density distribution and thickness deviation of the finished board.
Pre-pressing: The fluffy fiber mat then passes through a pre-press, where it is initially compacted into a blank with certain strength. This process removes internal air, reduces thickness, facilitates transportation, and prevents the mat from being blown apart when entering the main press.
5. Hot Pressing & Curing (Core Forming Section)
Continuous Hot Pressing: The mat is fed into a continuous press—the core equipment of the production line. The mat passes under a continuously moving, heated steel belt where, under set temperature , pressure , and speed, the MDI adhesive rapidly polymerizes, and the wood fibers are permanently bonded under heat and pressure. The continuous press precisely controls the 18mm thickness and ensures extremely uniform board density with smooth surfaces on both sides.
Mat Tracking & Quality Control: An advanced control system monitors and adjusts the pressure and temperature in different zones of the press in real-time, ensuring every part of the board achieves optimal performance.
6. Finishing & Processing
Cooling & Conditioning: The board exiting the press is very hot (over 100°C) and must immediately enter a cooling star and turnover device for forced cooling. This stabilizes the internal structure, prevents deformation, and reduces internal stress.
Trimming & Cutting: The cooled continuous board strip is precisely cut to standard sizes (e.g., 1220mm x 2440mm or 1830mm x 3660mm) by high-speed cross-cut and trim saws, and the rough edges are trimmed off.
Sanding: This is a critical step for ensuring the final product quality. The board passes through a wide-belt calibrating sander with multiple heads (e.g., 6-8 heads) to remove the pre-cured layer, correct minor thickness deviations, and achieve a highly smooth, flat surface ready for subsequent lamination, printing, or direct use.
7. Inspection & Packaging
Quality Inspection: Samples from the finished boards are tested for key indicators including: thickness tolerance, density, Modulus of Rupture (MOR), Modulus of Elasticity (MOE), Internal Bond (IB) strength, thickness swelling upon water absorption, and formaldehyde emission (confirmed to meet formaldehyde-free standards using the chamber method).
Stacking & Packaging: Qualified boards are stacked neatly by an automatic stacker, covered with protective film, secured with strapping, and labeled with specifications, production date, environmental grade etc., before being stored or shipped.
This 250, 000 cubic meters per year NAF (No-Added-Formaldehyde) MDF production line represents the pinnacle of technology, environmental protection, and profitability. Its core advantages are:
1. Cutting-Edge Eco-Technology, Defining New Health Standards
Formaldehyde-Free Core: Uses MDI (isocyanate) or other NAF adhesives, eliminating formaldehyde at the source. Formaldehyde emissions from finished boards are undetectable, far exceeding the world's strictest standards like CARB NAF and EPA NAF.
Green Production: Thermal energy is largely generated by burning wood waste (bark, sander dust) in an energy plant, enabling a circular economy and reducing carbon footprint.
2. High Automation & Intelligence, Ensuring Quality & Efficiency
Foundation for a "Dark Factory": The entire line is automated by a central DCS/PLC control system, with minimal human intervention from chipping to stacking. Ensures high production efficiency and stable annual capacity of 250, 000 m³.
Consistent Quality: Precise metering, blending, forming, and an intelligent continuous press guarantee extremely uniform density distribution, stable physical properties, and minimal thickness deviation in every 18mm board.
Traceability: Production parameters are monitored and recorded in real-time, allowing any quality issue to be traced back to the production batch and exact time.
3. Advanced Process Design, Optimized for NAF Production
Dedicated Blending System: Equipped with chemical-resistant, clog-resistant MDI-specific metering and atomizing injection systems for uniform resin distribution.
Single-Stage Drying: A unique single-pass dryer is employed to prevent MDI pre-curing upon contact with water, a critical process difference from conventional aldehyde-resin lines.
4. Superior Economics & Scale Benefits
Economies of Scale: The 250, 000 m³/year capacity offers significant unit cost advantages and strong market competitiveness.
High Yield: The advanced continuous press and sander line minimize waste and defects, maximizing material utilization.
High-Value Product: Produces premium-priced NAF boards that meet consumer upgrade trends, offering far greater profit margins than standard E-grade boards.
The 18mm thickness is the "sweet spot" for load-bearing and structural strength. Combined with its healthy NAF properties, this board is the material of choice for high-end applications:
1. High-End Home & Custom Furniture
Applications: Shelves and side panels for premium wardrobes/bookcases; substrate for tabletops (dining, desk); entire construction of children's furniture.
Reasons: The 18mm thickness provides excellent MOR (bending strength) and load-bearing capacity, ensuring sturdy, durable furniture resistant to warping. The NAF characteristic ensures a safe home environment for sensitive groups like children and the elderly.
2. Commercial & Public Space Decoration
Applications: Partitions, wall panels, display shelves, and service counter structures in hotels, offices, malls, and schools.
Reasons: Meets the high demands of commercial spaces for durability and fire resistance (when combined with fire-rated veneers). The NAF property guarantees indoor air quality (IAQ) in densely occupied environments and complies with green building certifications .
3. Specialty Demand Sectors
Applications: Furniture, cabinets, and interior décor in medical facilities; laboratory casework; storage cabinets in the food industry.
Reasons: These sectors have extremely stringent requirements for hygiene and safety. NAF MDF completely eliminates a source of formaldehyde pollution, making it a necessity.
4. Electronics, Luxury Retail & High-End Packaging
Applications: Back panels and structural components for high-end electronics (TVs, audio systems); display cases and podiums in luxury stores; packaging inserts for precision instruments.
Reasons: The 18mm thickness provides robust support and protection. The NAF characteristic prevents potential damage from VOCs to sensitive electronics or valuable goods.
5. DIY & Creative Home Projects
Applications: Making shelves, workbenches, and creative furniture in home workshops.
Reasons: Easy to cut, carve, and finish (laminate, paint, print). Its eco-friendly and safe nature gives DIY enthusiasts peace of mind.
Shandong MINGHUNG OSB&MDF Machinery Equipment Manufacturing Co.,Ltd. was founded in 1983, specializes in continuous press solutions for over 40 years.
MINGHUNG is a leading company in the industry of OSB&MDF making machine. With a strongfocus on producing high-quality machinery, we specialize in manufacturing thecomplete production line of Medium density fiberboard (MDF), High densityfiberboard (HDF),Particle board (PB), Oriented strand board (OSB) , Veneerable super strong particle board (LSB),Laminated board and veneer.
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
