How can I prevent condensation or water stains on the surface of calendered PVC shrink film when using water cooling?

When using water to cool the calendered PVC shrink film, preventing condensation or water stains on its surface is a key step to ensure product quality and neat appearance. Here are some effective measures to prevent condensation or water stains:

Control water temperature
Maintain appropriate water temperature: Make sure the temperature of the cooling water is not too low to avoid the rapid formation of condensation on the surface of the PVC film. Generally, the water temperature should be slightly higher than the ambient temperature or match the surface temperature of the PVC film to reduce condensation caused by temperature differences.

Optimize cooling methods
Use spray or mist cooling: Compared with direct immersion or large-area water flushing, spray or mist cooling can distribute cooling water more evenly and reduce condensation problems caused by local overcooling.

Adjust the spray angle and intensity: Make sure that the spray water can evenly cover the surface of the PVC film, while avoiding excessive water flow directly impacting the film surface, causing a sudden drop in local temperature.

Enhance ventilation
Improve ventilation conditions in the cooling area: Add ventilation equipment, such as fans or exhaust fans, to accelerate air flow in the cooling area, reduce humidity, and reduce the formation of condensation.
Keep air flowing: Make sure there are no obstructions around the cooling area so that air can flow smoothly and reduce humidity accumulation.

Preheating treatment
Preheat the PVC film: Before cooling, preheat the PVC film appropriately to make its surface temperature closer to the cooling water temperature, thereby reducing condensation caused by temperature differences.

Use anti-condensation agent
Add anti-condensation agent to cooling water: Some anti-condensation agents can reduce the surface tension of water and reduce the formation of condensation water. However, it is necessary to choose anti-condensation agents that are harmless to PVC films and follow the correct method of use.

Regular inspection and maintenance
Regularly check the cooling system: Make sure that the cooling system is operating normally without water leakage or blockage. Clean impurities and dirt in the cooling water in time to keep the water clean.
Maintain cooling equipment: Perform regular maintenance and maintenance on cooling equipment such as sprinkler heads and pipes to ensure that they are in good condition and avoid condensation problems caused by failures.

Drying treatment
Drying treatment after cooling: Use a hot air dryer or other drying equipment to dry the cooled PVC film to remove residual moisture and condensation on the surface.

By controlling water temperature, optimizing cooling methods, strengthening ventilation, preheating, using anti-condensation agents, regular inspection and maintenance, and drying, etc., condensation or water stains on the surface of calendered PVC shrink film can be effectively prevented when using water cooling. The implementation of these measures will help improve product quality and appearance neatness to meet market demand and customer requirements.