Product Definition & Structure
Whiteboard paper is a paperboard made primarily from waste paper or wood pulp through multi-layer forming, coating, and calendering processes. Its typical structure includes:
Top Layer: Bleached wood pulp or de-inked waste pulp with high whiteness and smoothness for optimal printing.
Core Layer: Composed of waste pulp or mechanical pulp to provide strength and stiffness.
Bottom Layer: Usually gray or brown to reduce costs and enhance structural stability.
It is classified into gray-bottom whiteboard paper (gray back) and white-bottom whiteboard paper (white back), with the latter preferred for high-end packaging.
2. Core Advantages
2.1 Exceptional Printability
Smoothness: Surface treated via coating and calendering achieves smoothness of 100–200ml/min (Bekk method), ensuring uniform ink transfer and sharp print quality.
Whiteness: Whiteness ≥75% (up to 85% for premium grades), enabling high-color fidelity for vibrant graphics and images.
Ink Absorbency: Moderate absorbency (30–60s/100ml) balances drying speed and print clarity, preventing dot gain or smudging.
2.2 High Strength & Stiffness
Basis Weight: 250–400g/m², thickness 0.3–0.5mm, with longitudinal stiffness ≥100mN·m and transverse stiffness ≥50mN·m for stable packaging formation and anti-bending resistance.
Burst Strength: ≥2.5kPa (GB/T 454), tear resistance ≥10mN (GB/T 455), suitable for transportation and storage.
2.3 Environmental Sustainability
Raw Materials: Contains 30–70% recycled waste paper, reducing virgin wood consumption; some products are FSC-certified for sustainable forest sourcing.
Production Processes: Employs low-energy equipment and wastewater recycling systems. For example, Constant Beauty Packaging uses RTO technology to achieve 99% organic waste gas reduction.
2.4 Cost-Effectiveness
10–20% more economical than white cardboard, ideal for mid-to-low-end packaging needs in daily necessities, food, and electronics.
3. Technical Specifications (Refer to GB/T 10335.4-2004)
|
Indicator |
Unit |
Typical Value |
Test Standard |
|
Basis Weight |
g/m² |
250–400 |
GB/T 451.2 |
|
Thickness |
mm |
0.3–0.5 |
GB/T 451.3 |
|
Whiteness |
% |
≥75 |
GB/T 7974 |
|
Stiffness (Longitudinal) |
mN·m |
≥100 |
GB/T 22364 |
|
Burst Strength |
kPa |
≥2.5 |
GB/T 454 |
|
Tear Resistance |
mN |
≥10 |
GB/T 455 |
|
pH Value |
- |
4.5–8.5 |
GB/T 1545 |
|
Moisture Content |
% |
4–8 |
GB/T 462 |
4. Applications
4.1 Packaging
Food Packaging: Used for pastry boxes, biscuit bags, and fast-food containers, meeting moisture and oil resistance requirements (e.g., Constant Beauty aseptic packaging).
Daily Necessities: Cosmetic boxes, toothpaste boxes, and stationery packaging, leveraging stiffness and printability for brand presentation.
Electronics Packaging: Phone boxes and home appliance liners, providing protection and marketing space.
If you need it. please contact us
WhatsApp business：Ryan Liu(+86)18933510649
email ：02@songhongpaper.com
website:https://www.grayboardpaper.com/
youtube:https://www.youtube.com/@songhongpaper-02
company address:(Factory Building) Hengyu Road 4th, Sandong Digital Park, Huicheng District, Huizhou City, Guangdong Province
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