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 Process Flow

The process flow of this production line is meticulously designed to ensure optimal efficiency and the highest quality from log to finished panel. The core innovation is the seamless integration of flame retardant treatment into the traditional OSB manufacturing process.

1.  Raw Material Preparation Section

      Debarking & Chipping: Logs are first debarked using a drum debarker (bark adversely affects glue bonding and panel appearance). Debarked logs are then fed into a disc chipper to produce wood chips of required size.

      Stranding & Screening: The wood chips are fed into a large ring flaker to produce strands of specified dimensions. The output strands are graded by a multi-deck screen. Qualified strands proceed; oversized strands are recirculated for re-flaking; fines can be used as fuel.

2.  Drying & Blending Section (Core of Flame Retardant Treatment)

      Drying: Qualified surface and core strands are conveyed pneumatically to separate rotary drum dryers. The goal is to reduce the moisture content from 40%-60% to a precise, low level (typically 2%-4%), which is critical for subsequent bonding quality.

      Resin & Flame Retardant Blending: This is the core stage for producing Flame Retardant OSB. Dried strands are sent to separate blenders for surface and core layers.

          Resin Blending: Inside the blender, atomized isocyanate resin is evenly sprayed onto the strands.

          Synchronous Flame Retardant Application: Key Step: Simultaneously, a high-precision metering system sprays eco-friendly liquid flame retardant onto the strands. This online synchronous application ensures uniform distribution and maximum penetration of both resin and retardant into the strands.

3.  Forming & Pre-pressing Section

      Oriented Forming: The blended surface and core strands are sent to a multi-head orienting former. Via mechanical or electrostatic orienting devices, surface strands are aligned along the panel's length, while core strands are laid randomly or cross-oriented. This grants the OSB panel its high mechanical strength along the length.

      Mat Pre-pressing: The loose, formed mat is lightly compressed by a continuous pre-press. This gives the mat initial strength for safe transportation to the main press without breaking.

4.  Pressing & Finishing Section

      Hot Pressing: The pre-pressed mat enters the "heart" of the line – the continuous flat press. Under high temperature (200-220°C) and pressure, the resin cures rapidly, bonding the strands firmly. The heat also facilitates the reaction between the flame retardant and wood fibers, forming a stable fire-resistant layer. The continuous press ensures stable pressure and temperature, resulting in panels with uniform density and a smooth surface.

     Cooling & Conditioning: The hot panels exiting the press are immediately cooled by a star cooler or roller cooler to stop chemical reactions, stabilize dimensions, and prevent warping. Cooled panels are stacked for conditioning, allowing the resin to reach final strength.

      Trimming & Sanding: The conditioned, rough-edged panels are trimmed to standard width by a double-end trimming saw. They are then sanded by a wide-belt sander to achieve precise thickness and a smooth surface.

      Quality Control & Packaging: Finally, panels are graded on an automatic inspection station. Qualified products are automatically stacked, packaged, and stored.

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 Main Production Equipment 

Section	Equipment Name	Function & Description
Raw Material Prep	Drum Debarker	Efficiently removes bark from logs, ensuring strand cleanliness.
	Disc Chipper	Chips logs into uniform wood chips for stranding.
	Ring Flaker	A core machine that transforms wood chips into ideal-sized strands.
	Multi-deck Screen	Precisely grades strands by size into face, core, and waste fractions.
Drying & Blending	Rotary Drum Dryer	Dries face and core strands efficiently and uniformly. Often paired with a energy plant using wood waste as fuel.
	Pneumatic Conveying System	Safely and efficiently transports dried strands to blenders, preventing blockages and fire hazards.
	Blender	Core Equipment. Includes separate blenders for face and core layers. Ensures uniform coating of resin and flame retardant via high-speed rotation.
	Flame Retardant Dosing System	Critical Equipment. Includes storage tank, pump, and precision flow meters for accurate retardant addition.
Forming & Pre-press	Orienting Former	Core Technology Equipment. Aligns strands via throwing wheels or electrostatic charge, determining the panel's mechanical properties.
	Continuous Belt Pre-press	Applies initial compression to the loose mat, increasing density and strength for safe transfer into the main press.
Pressing & Finishing	Continuous Flat Press	The most critical and expensive equipment. Applies consistent heat and pressure via continuous steel belts for high-efficiency, high-quality panel formation.
	Star Cooler / Roller Cooler	Rapidly cools panels to fix dimensions and improve stability.
	Double-end Trimming Saw	Automatically and precisely trims both edges of the panel to final width.
	Calibrating Wide-belt Sander	Sands top and bottom surfaces to achieve precise thickness tolerance and a smooth finish.
Auxiliary Systems	Central Control System	Based on PLC and industrial computers, it monitors and adjusts all line parameters in real-time for automated production.
	Dust Extraction & Environmental System	Collects dust and exhaust gases from various stages, ensuring a clean plant and compliant emissions.
	Energy Plant (Thermal Oil System)	Utilizes bark, sander dust, and trim ends as fuel to generate heat for dryers and the press, significantly reducing energy costs.

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 Core Technologies & Features

1.  Efficient Flame Retardant Treatment System:

      Features an advanced Online Flame Retardant Application System that precisely adds eco-friendly Phosphorus-Nitrogen based flame retardants simultaneously with resin blending after drying.

      Ensures even mixing and deep penetration into the wood fibers, guaranteeing the final boards achieve Chinese GB B1 level or international standards like Class B, with high fire resistance.

2.  Precise Oriented Forming Technology:

      Utilizes a multi-stage orienter to align surface strands along the panel's length (via mechanical or electrostatic methods) while the core strands are randomly or cross-oriented.

      This technology gives the OSB panels high Modulus of Elasticity (MOE) and tensile strength along the length, offering superior mechanical properties compared to ordinary particleboard.

3.  High-Precision Continuous Press:

      Equipped with a large-scale continuous flat press, providing stable and consistent pressure and temperature control.

      Ensures uniform density distribution, smooth surface, and high Internal Bond (IB) strength for the 15mm panels, while significantly boosting production efficiency.

4.  High Automation & Intelligent Control:

      The entire line is monitored by a central PLC and computer system, enabling full automation from raw material dosing and process parameters (temperature, pressure, speed) to final cutting.

      The user-friendly Human-Machine Interface simplifies operation, displays real-time data, and provides fault diagnostics, reducing dependence on skilled labor and ensuring product consistency and stability.

5.  Energy-Saving & Eco-Friendly Design:

      The heat required for the press is supplied by an efficient thermal oil heater or steam boiler, which can be fueled by biomass (sander dust, trim ends) generated during production, reducing energy costs.

      Advanced dust removal and exhaust gas treatment systems ensure emissions meet environmental regulations.

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 Applications

  Building Construction: Roof sheathing, Wall sheathing, Floor base (for wood-frame construction).

  Interior Decoration: Fire-resistant partitions, Ceiling substrates, Cabinet carcasses.

  Packaging Industry: Heavy-duty crates and pallets requiring fire-resistant properties.

 Others: Exhibition stands, Furniture substrates.

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 Our Advantages

  Turnkey Project: Provides a one-stop service including plant planning, equipment manufacturing, installation & commissioning, operator training, and after-sales support.

  Customized Solutions: Flexible line configuration can be adjusted according to client requirements for output, panel specifications (thickness, density), and special processes.

  Quality Assurance: Core components from internationally renowned brands ensure long-term stable operation and final product quality that meets or exceeds industry standards.