Peelable Foaming Kraft Paper: Industry Knowledge & Application Guide
Apr 20, 2026
Peelable Foaming Kraft Paper: Industry Knowledge & Application Guide
1. What Is Peelable Foaming Kraft Paper?
Peelable foaming kraft paper (also known as sponge foaming paper) is a specialized release liner designed for polyurethane (PU) sponge foaming production. It is manufactured by laminating a heat-resistant, non-stick PE layer onto a high-strength kraft paper base. The composite structure features a controlled, non-permanent bond between the kraft paper and the PE layer, allowing the two materials to be easily separated after use.
Its core function in sponge production is to act as a carrier and release medium during continuous sponge foaming:
Holds the liquid PU foam mixture evenly on its surface before curing
Prevents the foam from sticking to production lines, molds, or conveyor belts
Ensures smooth peeling post-foaming, protecting the sponge's surface integrity
Improves overall production efficiency and reduces defective rates
2. Key Advantages for Sponge Manufacturers
2.1 Excellent High-Temperature Resistance
Our paper withstands foaming temperatures of 120–180°C without deformation, yellowing, or performance degradation. It maintains dimensional stability under thermal stress, making it suitable for continuous high-speed production lines.
2.2 Superior Peelability & Residue-Free Performance
The specially formulated PE coating ensures clean, effortless peeling from cured PU sponge. No adhesive residue remains on the sponge surface, eliminating the need for secondary cleaning and ensuring a pristine finish.
2.3 High Tensile Strength & Durability
The reinforced kraft paper base provides high wet and dry tensile strength, resisting tearing, stretching, or breaking during unwinding, foaming, and peeling. It is engineered to adapt to high-speed production lines operating at 50–150 m/min.
2.4 Controlled PE-Kraft Separation
A unique feature of our product is the non-permanent bond between the PE layer and kraft paper. After use, the two can be easily separated, supporting more efficient waste sorting and recycling.
2.5 Ultra-Wide Format Capability
One of our key differentiators is the ability to produce rolls with a maximum width of 2500mm, making it ideal for large-format mattress foam production and reducing the need for joining multiple narrow sheets.
2.6 Cost-Effective & Eco-Friendly
Reduces material waste by minimizing defective sponge caused by sticking or tearing
Cuts labor costs by eliminating manual mold cleaning and sponge surface treatment
Supports sustainability with a recyclable kraft paper base, where the PE layer can be stripped for separate processing
3. How It Helps Sponge Factories Cut Costs
3.1 Reduces Defect Rate & Raw Material Waste
Prevents foam adhesion to molds and lines, reducing surface defects (tears, residues) by over 80%
Minimizes scrap from damaged sponge, lowering consumption of raw materials like polyol and isocyanate by 5–10%
3.2 Boosts Production Efficiency
Enables continuous, uninterrupted foaming without mold cleaning downtime
The 2500mm wide format accommodates larger molds, reducing production cycles and labor time
Clean peeling eliminates post-production trimming and cleaning, saving labor hours
3.3 Lowers Labor & Maintenance Costs
Eliminates manual mold cleaning, residue removal, and sponge trimming, cutting labor costs by 15–20%
Protects conveyor belts and molds from foam buildup, extending equipment life and reducing maintenance expenses
3.4 Optimizes Large-Format Production
The 2500mm width is ideal for producing full-size mattress foams without seams or joins
Reduces the risk of leaks or uneven foaming at joints, improving overall product quality and reducing rework
4. FAQ (Frequently Asked Questions)
Q1: What is the temperature range the paper can withstand?
A: Our standard grade handles 120–160°C, while the high-temperature grade withstands 160–180°C, ensuring stability during typical PU foaming processes (140–160°C).
Q2: Can the PE layer transfer to the sponge?
A: No. The PE coating is cross-linked and securely bonded to the kraft base under normal foaming conditions, ensuring no transfer to the sponge surface.
Q3: Is the paper reusable?
A: It is designed for single use in foaming, as the PE layer wears after one application. However, the kraft base is recyclable after the PE layer is stripped off.
Q4: What sizes are available?
A:
Width: Standard widths up to 2500mm (customizable to customer specifications)
Basis weight: 80–180 gsm
Roll length: 500–1000 m/roll (customizable)
Q5: Is it compatible with all PU sponge formulations?
A: Yes. It works with polyether/polyester-based PU foams, soft/hard foams, and open/closed-cell structures, suitable for furniture, bedding, automotive, and packaging sponges.
Q6: How should the paper be stored?
A: Store in a cool, dry, dark environment (temperature: 15–30°C; humidity: 40–60%). Avoid direct sunlight, moisture, and heavy pressure. The shelf life is 6–12 months when unopened.
Q7: Will the paper affect the sponge's physical properties?
A: No. The paper is chemically inert and does not react with PU foam. It only contacts the sponge surface temporarily and peels off completely, leaving no impact on internal structure, density, or hardness.
5. Conclusion
Peelable foaming kraft paper is an indispensable auxiliary material for modern PU sponge production. Our ultra-wide 2500mm format, combined with controlled peelability, high-temperature resistance, and recyclability, delivers significant cost savings, higher efficiency, and better product quality for manufacturers. As the industry moves toward larger-format, high-efficiency, and sustainable production, our specialized foaming paper remains a key enabler for profitable and eco-friendly manufacturing.
