What are the factors causing water leakage at the bottom of the paper cup after it is formed?

1. The pressure of the knurling wheel is too small

During the paper cup forming process, the pressure of the knurled wheel is crucial to the sealing of the bottom of the paper cup. If the pressure of the knurling wheel is too small, the paper at the bottom and the cup wall cannot be tightly combined, and water leakage may easily occur. The solution is to increase the pressure of the knurling wheel appropriately to ensure that the paper at the bottom of the paper cup and the cup wall can be fully bonded to form a seal.

2. The knurling pattern is smoothed.

The texture on the knurled wheel is used to increase friction and adhesion at the bottom of the paper cup. If the knurling pattern is worn flat, the bonding effect at the bottom of the paper cup will be greatly reduced, leading to water leakage problems. The solution is to regularly check the texture status of the knurled wheel and replace or re-engrav it if necessary to maintain the effective working condition of the knurled wheel.

3. The vortex hearth furnace is too high and needs to be adjusted appropriately.

The vortex bottom furnace plays the role of heating and fusion during the forming process of the bottom of the paper cup. If the position of the vortex bottom furnace is too high, the heat cannot be effectively transferred to the bottom of the paper cup, causing the bottom to be bonded weakly and causing water leakage problems. The solution is to adjust the position of the vortex bottom furnace according to the specific situation so that it can effectively heat the bottom of the paper cup and ensure strong bonding.

4. The heating furnace temperature is too low

The temperature of the heating furnace has a direct impact on the bonding effect at the bottom of the paper cup. If the temperature of the heating furnace is too low, the hot melt glue at the bottom of the paper cup cannot be fully melted, resulting in weak adhesion and easy leakage. It is generally recommended to adjust the temperature of the heating furnace to between 250-300 degrees Celsius, which can ensure that the hot melt adhesive is fully melted, the bottom is firmly bonded, and it is not easy to leak.

In summary, the reasons for water leakage at the bottom of paper cups after forming mainly include insufficient pressure on the knurling wheel, wear of the knurling pattern, improper position of the vortex bottom furnace, and too low temperature of the heating furnace. By appropriately increasing the pressure of the knurling wheel, regularly maintaining the knurling wheel, adjusting the position of the vortex bottom furnace and controlling the temperature of the heating furnace, the problem of water leakage at the bottom of the paper cup can be effectively solved and the quality and use experience of the paper cup can be improved.