Cupstock base paper is a high-grade, uncoated paperboard specifically engineered for the production of PE-coated packaging. Made from 100% virgin wood fibers, it provides a pure, strong, and consistent substrate. Its key characteristics include high intrinsic stiffness, and superior smoothness, which are essential for optimal converting performance during cup manufacturing and subsequent extrusion coating.
This base paper is the critical raw material for creating final cupstock, found in beverage cups for coffee, tea, and soft drinks, as well as food containers. It must meet stringent food safety and purity standards.
ChinaPaper supplies a reliable range of cupstock base papers with controlled porosity and specific grammages (e.g., 150-320gsm), offering a dependable foundation for high-quality, leak-proof finished packaging.
Item | Details |
Classification | Cupstock Base Paper/Uncoated Cupstock Base Paper |
Material | 100% Virgin Wood Pulp |
Color | White or Brown |
Top Brightness | ≥77.0 % |
Edge Wicking | ≤2.0 kg/㎡ |
Grammage | 150–320gsm |
Size | 700×1000mm, 787×1092mm, 889×1194mm or width >600mm in roll size, custom size, etc. |
Packaging | PE-wrapped, 4-corner protector, Strong export pallets |
Loading | 16–18 tons/20FT ; 25 tons/40FT |
Certificates | ISO, FSC, SGS,FDA |
Cupstock base paper serves as the essential substrate for PE-coated paperboard, primarily used to manufacture a wide range of single-use food and beverage containers.
As the core material for disposable cups, it provides the fundamental stiffness and strength. Its controlled porosity ensures excellent adhesion of the PE coating, creating a reliable liquid barrier for coffee cups, tea cups, soft drink cups, and milkshake cups.
This paper is engineered to meet the demands of food containers requiring grease and moisture resistance. It forms a sturdy base for coating, used in soup bowls, noodle boxes, salad containers, and French fry cups, ensuring integrity with hot or oily contents.
The paper's high purity and consistent quality make it suitable for frozen dessert packaging. It provides a stable, food-safe base for producing single-serving ice cream cups, yogurt pots, and other dairy product containers.
With growing demand for eco-friendly solutions, this base paper is increasingly used as a substrate for PLA or water-based barrier coatings. It is also specified for higher-grammage formats requiring extra rigidity, such as large-size meal boxes and bucket-style packaging.
Produced under FDA and FSC Chain of Custody
Strict moisture control before packing
Uniform grammage tolerance and caliper consistency
Each batch inspected for brightness, stiffness, and ply-bond strength
Stable supply with full traceability
PE-wrapped for moisture protection
Four-corner protectors for shock resistance
Strong export pallets suitable for long-distance shipping
Stretch film wrapping or metal strapping available upon request
Fumigation-free pallets optional
20FT/40FT container loading plans available
Cupstock base paper is a high-quality, uncoated paperboard specifically engineered as the primary raw material for producing PE-coated cupstock.
In paper cup machines, cupstock is fed from large rolls. The machine performs several automated steps:
Printing (if not pre-printed): The blank cupstock is printed with designs.
Die-cutting: It is cut into precise fan-shaped "cup blanks."
Forming: The blank is rolled into a cylinder.
Side Sealing: The seam is heated and pressed to seal the PE layers together.
Bottom Sealing: A pre-cut bottom disc is attached by melting the PE coating to create a leak-proof seal.
Rim Curling: The top rim is rolled for strength and comfort.
The entire process relies on the consistent quality, stiffness, and heat-seal performance of the cupstock.
Cupstock paper (both base paper and the final coated product) is primarily made from 100% virgin wood fibers, sourced from responsibly managed forests. Using virgin fibers is crucial for ensuring hygiene, food safety, strength, and consistency.
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