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High-Precision Knife-Over-Roll Coating Line for XPS Board Surface Leveling
This customizable XPS board knife coating line is specifically engineered for applying uniform, precise layers of cementitious mortars, polymer-modified coatings, acrylic renders, primers, or adhesives onto XPS (extruded polystyrene) rigid foam boards. Available in high-precision leveling, stucco-ready mortar, and industrial continuous production configurations.
Unlike spray or roller coating, the knife-over-roll method achieves >95% transfer efficiency with minimal material waste, eliminating overspray—this is especially critical for XPS substrates, which are sensitive to solvent attack. Excess high-viscosity coating is recirculated back to the supply tank, delivering 35-45% material savings compared to spraying.
The system is fully customizable in coating width, thickness range, blade type, board thickness accommodation (3-200mm), and XPS density handling (25-50kg/m³).
Working principle: XPS boards are fed through a precision backing roller, where a doctor blade (comma blade or straight scraper) applies a controlled wet coating layer. The coated boards then pass through a low-temperature drying tunnel (≤60°C to prevent foam deformation), followed by cooling and stacking. The system effectively fills surface pores, hides foam texture, and creates a smooth base for exterior insulation finishing systems (EIFS), decorative renders, or protective layers.
Technical Parameters
Parameter
High-Precision Leveling Model
Stucco-Ready Mortar Model
Industrial Continuous Model
Max board width (customizable)
600 - 1200 mm
600 - 2400 mm
600 - 2400 mm
Board length (customizable)
Unlimited (continuous)
800 - 3000 mm
Unlimited (continuous)
Board thickness range (customizable)
3 - 80 mm
10 - 120 mm
10 - 200 mm
Coating method
Knife-over-roll (doctor blade)
Knife-over-roll
Knife-over-roll
Wet coating thickness (customizable)
0.5 - 10 mm (±0.1mm)
0.3 - 5.0 mm (±0.05mm)
0.5 - 10 mm (±0.1mm)
Coating uniformity
±3% across full width
±3% across full width
±3% across full width
Coating speed (customizable)
1 - 20 m/min
2 - 30 m/min
2 - 30 m/min
Material transfer efficiency
95% - 98%
95% - 98%
95% - 98%
Coating viscosity range
100 - 100,000 cP
2000 - 25,000 cP
100 - 100,000 cP
Blade type (customizable)
Hardened steel / Tungsten carbide
Round-edge / Straight bevel
Hardened steel / Tungsten carbide
Backing roller material (customizable)
Rubber-coated / PU
Silicone (soft) / EPDM (hard)
Silicone / EPDM
Drying method (customizable)
Hot air / IR (≤60°C)
IR + low-temp air (≤55°C)
Hot air / IR multi-zone
Control system
PLC + HMI touchscreen
PLC + HMI touchscreen
PLC + HMI touchscreen
Power supply (customizable)
380V/415V, 50/60Hz, 3-phase
380V, 50/60Hz, 3-phase
380V/415V, 50/60Hz, 3-phase
Typical application
Primer, smooth leveling coat
EIFS base coat, anti-skid coating
Large-scale building panels
Applications
Exterior wall insulation (EIFS): Base coat adhesive mortar onto XPS insulation boards for external facade systems
Low drying cost: Thin, controlled layer cures faster than thick spray coats - reduced energy consumption
Robust construction: Heavy-duty steel frame, corrosion-resistant surfaces for 24/7 operation
PLC control with recipe storage: One-touch settings for different coating types; data logging and remote diagnostics capability
Support and Services
Free process consultation - send your XPS boards and coating material for trial coating
Custom layout design for your production floor
On-site installation and commissioning (customizable support packages)
Operator training program included
Remote troubleshooting via video call, IoT monitoring, or network central controller
18-month warranty on main machine, 12-month on electrical parts
Spare parts availability from regional warehouses
Lifetime technical support via phone, email, or chat
Packing and Shipping
Packing: Anti-rust film + reinforced wooden case for main body and control cabinet; foam padding for fragile components
Standard model lead time: 30-40 days after order confirmation
Custom configuration lead time: 30-60 days (longer for custom widths or dual-head configurations)
Shipping: FOB Shanghai / CIF by sea, air, or rail
Customizable: Export crating, custom labeling, destination port documentation
Frequently Asked Questions
Q1: How much material can I save compared to spraying plaster onto XPS?
A: Typically 35-45% for medium-viscosity plasters. Spraying wastes 30-50% as overspray + bounce-back from rigid foam. Knife coating recirculates >95% of excess. We provide a customizable free test with your XPS and coating before order.
Q2: Will the knife coater crush or deform soft XPS boards (e.g., 25kg/m³)?
A: No. The backing roller is customizable (soft silicone) and the blade gap can be set to a floating mode. Nip pressure is adjustable. For very soft boards, we add a rigid backplate support.
Q3: My coating contains sand or short fibers. Can the machine handle that?
A: Yes. We use a customizable carbide blade (wear-resistant) and an open-gear or screw pump (not a close-tolerance gear pump). Filters are coarser or removable. Recovery trough has a screen to separate large particles before recirculation.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2007
Total Annual:
2000000-3000000
Employee Number:
150~200
Ecer Certification：
Verified Supplier
Dongguan OSMANUV Machinery Equipment Co., Ltd. was established in 2007 and is headquartered in Dongguan, Guangdong Province, a renowned manufacturing hub within the Guangdong-Hong Kong-Macao Greater Bay Area. We are a high-tech enterprise integrating R&D, production, sales, and af... Dongguan OSMANUV Machinery Equipment Co., Ltd. was established in 2007 and is headquartered in Dongguan, Guangdong Province, a renowned manufacturing hub within the Guangdong-Hong Kong-Macao Greater Bay Area. We are a high-tech enterprise integrating R&D, production, sales, and af...
