Cup sealing film

The material must be compatible with the cup type. Common structures include PET/CPP for PP cups, PET/PE for PE or paper cups, and Easy-Peel films for consumer convenience. Ensure the thickness is between 38 to 52 microns to prevent tearing while maintaining a high-quality seal.

Verify that the supplier provides FDA (U.S.) or EC 1935/2004 (EU) food-grade certifications. The inks used for printing must be non-toxic, low-migration, and heavy-metal free to ensure no chemical leaching occurs during the heat-sealing process.

You must confirm the roll width (typically 130mm for standard bubble tea cups) and the inner core diameter (usually 76mm). Additionally, ensure the film includes eye-mark sensors (black registration marks) if you are using an automatic sealing machine to ensure precise alignment of the printed design.

Request the optimal sealing temperature range, which usually falls between 160°C and 180°C. The film should provide a hermetic seal that is leak-proof even under pressure, yet allows for a clean straw puncture without shattering the film.

The primary risks include color deviation between digital proofs and physical rolls, and odor issues from uncured inks. To mitigate this, request a pre-production sample and specify the use of Pantone color codes to ensure brand consistency.

Focus on tiered pricing based on the number of colors; more colors require more copperplate cylinders. Negotiate for a waived cylinder fee if the order exceeds a certain volume (e.g., 500 rolls) and ask for a lead time guarantee to avoid stockouts in your local market.

Sealing films are sensitive to heat and humidity. Ensure the supplier uses moisture-proof packaging and reinforced cartons. For shipping to tropical regions, specify stowage away from heat sources on the vessel to prevent the film layers from 'blocking' or sticking together.

Utilize Secured Trading Services on Made-in-China.com to protect your payment until delivery. Always hire a third-party inspector to perform a 'smell test' and a 'sealing test' at the factory before the final balance is paid to ensure the batch meets your specifications.