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Continuous Hot Press for Fireproof Board Substrates & Class A Flame Retardant Certification

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Continuous Hot Press for Fireproof Board Substrates & Class A Flame Retardant Certification

Continuous Hot Press for Fireproof Board Substrates & Class A Flame Retardant Certification

Fireproof Board Substrate: Inorganic materials (e.g., calcium silicate, magnesium oxide) or flame-retardant modified wood fiber cores, formed under high temperature/pressure for construction fire barriers.
Continuous Hot Press: Automated equipment using steel belts for continuous conveyance, with zoned pressure and heating for curing substrates.
Class A Certification: Highest fire rating under China’s GB 8624 standard, requiring non-combustibility (strict thresholds for heat release, smoke density, toxic gas).

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Model:
MH-CHP
Brand:
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Product Description

Continuous Hot Press for Fireproof Board Substrates & Class A Flame Retardant Certification

Ⅰ. Fireproof Board Substrates

1. Substrate Types

Inorganic Substrates (Dominant):

Calcium Silicate Board: Quartz powder (45%) + Lime (33%) + Cement (15%) + Pulp fiber (7%)

Magnesium Oxide Board: MgO + MgCl₂ + Plant fibers (requires surface sealing)

Glass-MgO Board: MgO + Fiberglass mesh (high strength)

Organic substrates (flame-retardant modification)

Flame-retardant particleboard: Wood chips + phosphorus-nitrogen type flame retardant (addition amount 8-15%)

Flame-retardant MDF: Wood fibers impregnated with zinc borate/aluminum hydroxide (impregnation concentration ≥ 12%)

2. Standard Dimensions

Parameter	Standard Range	Customization
Thickness	6mm, 9mm, 12mm	4mm(ultra-thin)-25mm
Width	1220mm, 1250mm	800-1500m
Length	2440mm, 2750mm	1200-3660mm

II. Production Process of Flame-Retardant Particleboard Base Material

PB生产流程图

1. Raw Material Preparation

Wood fragmentation:Fast-growing forest wood (poplar/cedar) is debarked, sliced, and screened to produce 20-40mm long and 0.2-0.5mm thick particle boards.

Drying:The drum dryer reduces the moisture content of the particle boards from 40-60% to 2-4% (temperature 120-140℃, to avoid carbonization).

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2. Application of Flame Retardants

Types of Flame Retardants:

Liquid type: Ammonium phosphate solution (concentration 15-20%)

Powder type: Polyphosphate ammonium (APP) + Aluminum hydroxide (ATH) compound (ratio 1:1)

Application method:

Liquid: Ammonium phosphate solution (15-20% conc.) sprayed at 10-12% dosage

Powder: APP+ATH blend (1:1 ratio) mixed with UF resin (25-30% of resin solids)

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3. Blending & Forming

Resin System:Modified UF resin (50-55% solids) + retardant, total adhesive 8-10% of dry flakes

Layered Forming:

Surface: Fine flakes (<0.3mm, 40% for smoothness)

Core: Coarse flakes (>1mm, 60% for stability)

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4. Pressing

Pre-pressing:cold-pressed at 1-1.5MPa for 30s to 50% target thickness

Continuous Hot Pressing:

Parameter	Surface Layer	Core Layer
Temperature	180-185℃	170-175℃
Pressure	3.5-4.0MPa	2.8-3.2MPa
Time	20-25 sec/mm	(e.g., 240-300s for 12mm)

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5. Post-processing

Cooling & Conditioning: Roller cooling to <50℃, humidity adjusted to 8-10%

Curing: Stacked in climate chamber (25±2℃) for 48-72 hours

Sanding: Double-side calibrated to ±0.15mm tolerance

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Ⅲ.Conversion to Fireproof Board

1. Surface Treatment:

Coating with melamine resin + aluminum hydroxide filler (25-35g/㎡)

2. Decorative Lamination:

Layer	Material	Thickness
Wear Layer	Sb₂O₃-containing overlay	0.08-0.15mm
Decorative Layer	Flame-retardant printed paper	0.12-0.18mm
Core	Treated substrate	6-25mm
Balance Layer	Phenolic-impregnated kraft	0.3-0.5mm

3. Hot Pressing:

Pressure: 8-12MPa

Temperature: 140-160℃

Time: 25-40 seconds/mm thickness

4. Post-Processing:

UV-cured scratch-resistant coating (3-5μm)

Surface texturing for stone/wood grain

Ⅳ.Key Performance Standards

Fire Rating (GB A-class): Heat release ≤2.0MJ/kg, smoke density ≤15

Physical Properties: Thermal conductivity 0.15-0.25W/(m·K), flexural strength ≥15MPa

Ⅴ. Critical Role of Hot Press in Class A Certification

5.1 Precision Temperature Control:

Flame retardants (e.g., aluminum hydroxide, phosphorus-nitrogen compounds) activate within specific ranges (180-220°C). Zoned heating ensures core-layer reaction without under/overburning.

5.2 Uniform Pressure Penetration:

High-pressure zones (>5MPa) force molten retardants into substrate pores, creating dense fire barriers to block oxygen diffusion.

5.3 Structural Integrity Assurance:

Constant-pressure curing eliminates internal stress, preventing post-cooling cracks (which compromise fire resistance) and ensuring structural stability during combustion tests.

Ⅵ. Technical Requirements for Class A Certification

6.1 Retardant Compatibility:

Press components (e.g., chrome-plated belts) must resist acid/alkali corrosion from retardants.

6.2 Low-Smoke Emission Design:

Negative-pressure exhaust systems remove volatile decomposition gases during pressing, reducing smoke density in later combustion.

6.3 Process Traceability:

Temperature/pressure curves must be recorded to verify activation conditions for certification audits.

Ⅶ. Certification Value

Regulatory Compliance: Mandatory for interior applications (especially high-rises/public spaces).

Performance Edge: Certified substrates achieve 1-3 hours fire resistance (EN 13501-2).

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MINGHUNG clients MINGHUNG plywood machine

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Shandong MINGHUNG Wood Machinery Co.,Ltd is one famous manufacturer of plywood machine in China, located in Linyi city.

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Continuous Hot Press for Fireproof Board Substrates & Class A Flame Retardant Certification

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