What are the characteristics of the gypsum board covering paper production line
2026-04-21
The gypsum board covering paper (protective paper) production line is a long net/stacked net multi cylinder paper production line designed specifically for producing high-strength, high water resistance, and high surface quality industrial protective paper. Its core features include a three-layer composite structure, high strength and high water resistance, high-speed stability, precise quantification, high automation, raw material adaptation to waste paper, energy saving and low consumption, and strict quality.
1、 Product Structure and Raw Material Characteristics (Core)
Three layer composite structure (face core bottom)
Surface layer: bleached wood pulp+deinked pulp (DIP) → high whiteness, smoothness, surface strength, easy printing
Core layer: OCC waste paper long/short fibers → Low cost, high stiffness, high thickness, good filling properties
Bottom layer: OCC short/medium fiber → high bonding strength, anti stripping, resistant to gypsum alkaline corrosion
The main raw material is waste paper (cost reduction+environmental protection)
Surface layer: bleached wood pulp (20% -40%)+office waste paper deinked pulp (60% -80%)
Core/Bottom Layer: 100% Waste Paper Pulp (OCC Carton Paper Classification Utilization)
Key: De ink+thermal dispersion, ensuring a whiteness of 55% -65%, no impurities, and no yellowing
2、 Process and equipment characteristics (key)
Flow box and forming: precise composite of triple layered mesh
Triple layer net former, simultaneous forming of surface layer/core layer/bottom layer, one-time composite
Control the dryness difference to ≤ 1.5%, with strong interlayer bonding, no layering, and no foaming
Banner quantitative difference ≤± 1.5g/m ², uniform thickness
Squeezing: Shoe pressing+double rollers, high-strength dehydration
Two presses (shoe press+double roll), dehydrate to a dryness of 45% -50%
Fiber bonding is tight, high tightness, good wet strength, and reduces drying load
Drying: Multiple cylinder grouping+precise temperature control
30-60 drying cylinders, temperature controlled by zones (80-110 ℃)
Dry degree of 92% -95%, stable size, no deformation, no warping
Surface glue: film transfer glue, strong water resistance
Special KSS-7107 and other sizing agents, film transfer sizing
Core functions: high water resistance, high surface strength, gypsum alkali resistance, anti pilling and powder shedding
Completed: High speed winding+precision rewinding
Vehicle speed: 600-1000m/min (high-speed line)
Automatic correction, tension closed-loop control, no breakage
Retraction accuracy: ± 0.5mm, neat end face, no paper powder
3、 Performance indicators (different from regular paper)
Quantification: 140-220g/m ² (upper paper), 160-250g/m ² (lower paper)
Tensile strength: Longitudinal ≥ 6-8kN/m, transverse ≥ 2.5-3.5kN/m
Wet tensile strength: Longitudinal ≥ 800-1200N/m (resistant to gypsum slurry immersion)
Cobb water absorption (30min): ≤ 25-30g/m ² (high water resistance)
Whiteness: 55% -65% (optical white, stable without yellowing)
Surface strength: ≥ 12-18m/s (no powder shedding, suitable for high-speed gypsum board lines)
4、 Automation and Control (Modern Line Standard)
DCS full process control: flow rate, concentration, vehicle speed, moisture content, temperature, tension
QCS online detection: real-time closed-loop detection of quantitative, moisture, thickness, ash content, and whiteness
Automatic roll change, automatic paper breakage detection, and fault warning
Online monitoring of energy consumption, intelligent regulation of steam/electricity/water
5、 Environmental Protection and Energy Conservation (Industry Trends)
Closed cycle of white water: reuse rate≥ 90%, COD≤600、SS≤80
Waste paper utilization rate ≥ 80%, reducing wood pulp consumption
Shoe pressure+high-efficiency dryer: steam consumption reduced by 8% -12%
Waste heat recovery and variable frequency drive: energy-saving by 15% -20%
6、 Core advantages of production line (summary)
Strong structure: three-layer composite, strong interlayer bonding, no delamination, no fracture
Good water resistance: surface glue+wet strength agent, resistant to gypsum slurry corrosion, no paper decay
Surface quality: smooth, stable whiteness, no powdering, easy to print, suitable for decoration
Stable high: high speed, low breakage, uniform banner, small tolerance
Cost advantages: mainly based on waste paper, low energy consumption, high yield rate
Strong adaptability: compatible with gypsum board production lines at speeds of 120-200mm/min
1、 Product Structure and Raw Material Characteristics (Core)
Three layer composite structure (face core bottom)
Surface layer: bleached wood pulp+deinked pulp (DIP) → high whiteness, smoothness, surface strength, easy printing
Core layer: OCC waste paper long/short fibers → Low cost, high stiffness, high thickness, good filling properties
Bottom layer: OCC short/medium fiber → high bonding strength, anti stripping, resistant to gypsum alkaline corrosion
The main raw material is waste paper (cost reduction+environmental protection)
Surface layer: bleached wood pulp (20% -40%)+office waste paper deinked pulp (60% -80%)
Core/Bottom Layer: 100% Waste Paper Pulp (OCC Carton Paper Classification Utilization)
Key: De ink+thermal dispersion, ensuring a whiteness of 55% -65%, no impurities, and no yellowing
2、 Process and equipment characteristics (key)
Flow box and forming: precise composite of triple layered mesh
Triple layer net former, simultaneous forming of surface layer/core layer/bottom layer, one-time composite
Control the dryness difference to ≤ 1.5%, with strong interlayer bonding, no layering, and no foaming
Banner quantitative difference ≤± 1.5g/m ², uniform thickness
Squeezing: Shoe pressing+double rollers, high-strength dehydration
Two presses (shoe press+double roll), dehydrate to a dryness of 45% -50%
Fiber bonding is tight, high tightness, good wet strength, and reduces drying load
Drying: Multiple cylinder grouping+precise temperature control
30-60 drying cylinders, temperature controlled by zones (80-110 ℃)
Dry degree of 92% -95%, stable size, no deformation, no warping
Surface glue: film transfer glue, strong water resistance
Special KSS-7107 and other sizing agents, film transfer sizing
Core functions: high water resistance, high surface strength, gypsum alkali resistance, anti pilling and powder shedding
Completed: High speed winding+precision rewinding
Vehicle speed: 600-1000m/min (high-speed line)
Automatic correction, tension closed-loop control, no breakage
Retraction accuracy: ± 0.5mm, neat end face, no paper powder
3、 Performance indicators (different from regular paper)
Quantification: 140-220g/m ² (upper paper), 160-250g/m ² (lower paper)
Tensile strength: Longitudinal ≥ 6-8kN/m, transverse ≥ 2.5-3.5kN/m
Wet tensile strength: Longitudinal ≥ 800-1200N/m (resistant to gypsum slurry immersion)
Cobb water absorption (30min): ≤ 25-30g/m ² (high water resistance)
Whiteness: 55% -65% (optical white, stable without yellowing)
Surface strength: ≥ 12-18m/s (no powder shedding, suitable for high-speed gypsum board lines)
4、 Automation and Control (Modern Line Standard)
DCS full process control: flow rate, concentration, vehicle speed, moisture content, temperature, tension
QCS online detection: real-time closed-loop detection of quantitative, moisture, thickness, ash content, and whiteness
Automatic roll change, automatic paper breakage detection, and fault warning
Online monitoring of energy consumption, intelligent regulation of steam/electricity/water
5、 Environmental Protection and Energy Conservation (Industry Trends)
Closed cycle of white water: reuse rate≥ 90%, COD≤600、SS≤80
Waste paper utilization rate ≥ 80%, reducing wood pulp consumption
Shoe pressure+high-efficiency dryer: steam consumption reduced by 8% -12%
Waste heat recovery and variable frequency drive: energy-saving by 15% -20%
6、 Core advantages of production line (summary)
Strong structure: three-layer composite, strong interlayer bonding, no delamination, no fracture
Good water resistance: surface glue+wet strength agent, resistant to gypsum slurry corrosion, no paper decay
Surface quality: smooth, stable whiteness, no powdering, easy to print, suitable for decoration
Stable high: high speed, low breakage, uniform banner, small tolerance
Cost advantages: mainly based on waste paper, low energy consumption, high yield rate
Strong adaptability: compatible with gypsum board production lines at speeds of 120-200mm/min
