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Is it easy for a 12oz Paper Water Cup to deform or leak after it is filled with drinks?

2025-05-16

The anti-leakage and anti-deformation ability of a 12oz Paper Water Cup is closely related to its material and production process. High-quality 12oz Paper Water Cups usually use single-sided PE coating technology. The PE film on the inner wall is smooth and dense, which can effectively block liquid penetration. If the coating thickness meets the standard and the bonding process between the cup body and the bottom of the cup is strict, such as seamless bonding through high-temperature hot melting, then the paper cup is not prone to leakage when filled with regular drinks.

However, if there are process defects at the seams, such as insufficient hot melting temperature or uneven bonding, liquid penetration at the gap may occur, causing leakage. In addition, the stiffness of the paper is also a key factor affecting the anti-deformation ability. High-quality paper cups usually use high-weight base paper, and the cup wall has a high stiffness, and can still remain upright after being filled with 400 ml of liquid. If the paper weight is too low or the cup body structure is not designed properly, the cup body may bend or deform due to gravity after being filled with liquid, especially when hot drinks are filled, the softening of the cup wall due to heat will aggravate this phenomenon.

The type, temperature and chemical properties of the beverage directly affect the anti-leakage and anti-deformation properties of the paper cup. High-temperature liquids will accelerate the oxidation process of the PE film and may release trace amounts of carbonyl compounds, but qualified products that meet national standards can still maintain sealing. However, if the paper cup is dedicated to cold drinks, filling it with hot drinks will cause the wax layer to melt, which will cause leakage.

Condensation water is easily formed on the outer wall of the cup body. If the paper is too absorbent or not treated with moisture-proof treatment, it may cause the bottom of the cup to absorb water and soften, which will cause deformation. Ethanol has extremely strong permeability. Experiments show that in the simulation test of 65% ethanol solution, 47 out of 80 batches of paper cups leaked. Therefore, it is strictly forbidden to use paper cups to hold alcoholic beverages. Long-term immersion in highly acidic beverages may corrode the PE film, but the risk of short-term use is low.

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