There are currently two types of cup lid materials, namely PP and PS. They both undergo special production processes, including injection molded lids and blister lids.

Our common cup lid sizes are 62mm, 70mm, 80mm and 90mm. The packaging method is 50 pieces per piece, and each piece is packaged independently. Additionally, they can be sold bundled with paper cups, providing an attractive option for retail.

For paper cup proofing orders, the entire mold series in our paper cup machine meets the needs of most paper cup customers.

In response to the market needs of different customers at home and abroad, we have designed a matching test for cup lids. Test liquids such as carmine, coffee and milk tea are used and examined at precise test temperatures between 70 and 80 degrees Celsius.

Lid fit test: Our precision-engineered lids seamlessly wrap around the edge of the paper cup, ensuring a secure fit without any risk of falling off. The capping process is accompanied by a distinctly crisp sound. To ensure that the lid fits the cup perfectly, rotate the cup body 360 degrees. After disassembling, we checked that there was no obvious deformation of the paper cup curling edge, which further confirmed the matching degree of our product and the lid.

Pour test: Carefully pour 70-80 degree liquid into the cup, two-thirds of the way up the cup. Tilt the paper cup at a 45-degree angle for 10 seconds and carefully inspect the inner seams for leaks. More than 3 drops are considered unqualified. To improve the quality of the product, the cup filled with coffee is also tilted 45 degrees for 15 minutes. Then remove the cap and check to make sure there are no deformed edges or accidental drips.

Tilt and Rotation Test: Injecting precisely measured 70-80 degree liquid into two-thirds of the cup, a nuanced tilt at a 45-degree angle is executed, coupled with a deliberate rotation spanning 20 seconds. A vigilant record of the ensuing dripping scenario is maintained, and any occurrence exceeding 3 drops is swiftly categorized as substandard.

Swing Test: With two-thirds of the cup housing 70-80 degree liquid, the paper cup undergoes a strategic 20-second shake in both X and Y directions. A meticulous assessment is conducted, and the detection of more than 3 drops unequivocally signals non-compliance.

Lid Test: Elevating the lid, delicately attached to a coffee-filled cup, with a single hand, initiates a controlled vertical shake sequence performed thrice. The discernment here is acute – any untimely detachment of the lid renders it unsatisfactory.

Push Test: A gradual and deliberate push, once, to an upright coffee-filled cup forms the crux of this examination. A prerequisite for compliance is the unwavering adherence of the lid under this carefully orchestrated pressure.

Re-closing the Lid: The final phase entails letting the coffee-filled cup sit undisturbed for a stipulated 20-minute duration. This passive re-closing evaluation ensures the lid’s sustained integrity under real-world conditions.

Cup Squeezing Test: A halfway hold of the paper cup, with subsequent pinching of the cup’s body by one-third inward, sets the stringent parameters for this assessment. The non-negotiable criterion is that the cup lid must exhibit steadfastness and refrain from dislodging.

Bumping Test: Concluding the battery of tests involves subjecting two paper cups to a controlled up-and-down motion, executed 10 times consecutively. Through this rigorous examination, any lapses in lid adherence become unequivocally evident

The primary objective of paper cup and lid testing is to ensure that the performance, quality, safety, and reliability meet expected standards. The testing purposes include:

  • Leak-proof performance test
  • Heat resistance test
  • Cold resistance test
  • Ease of opening test
  • Material safety testing
  • Environmental performance testing
  • Packaging stability testing

These tests ensure that cup and lid products meet customer expectations, comply with relevant regulations, and perform well in the market.