Why do suction cups leave suction cup marks on the surface of glass and how to remove this suction cup mark?

We often encounter suction cup marks on the glass, what is the general reason for this?

1. There are impurities between the suction cup and the glass, such as oil stains or dust and water vapor, which naturally leave marks under pressure.

2. If there are no impurities between the glass and the suction cup, it may also be due to pressing to exhaust air, causing work when pulled up, resulting in a temperature difference and condensation of water vapor!

3. Due to the glass itself, the suction cup position is generally affected by real air sweeping, forming a circle without anti mold powder. After being stored for a long time, this position will be more prone to mold and produce marks than other positions.

4. The general material of the suction cup is nitrile rubber. The suction cup position generates a vacuum, causing friction between the suction cup and the glass. Trace amounts of nitrile rubber remain on the surface of the glass, forming a waterproof layer or similar oil film properties, which can easily produce suction cup marks during secondary processing.

5. When the glass is being loaded, the surface temperature of the glass is still high, and the microcracks are still in an open state. When the suction cup absorbs it, low-temperature compressed air is easy to enter the microcracks and produce condensation water. Causing subsequent glass mold to form marks.

6. In addition, when the Na2O content in the glass itself is too high, similar situations can also occur at the suction cup position.

Regarding the solution:

1. Reduce the surface temperature of the glass

2. Reduce the vacuum degree of the suction cup and reduce the friction between the glass and the suction cup. Simultaneously reducing the water vapor content of compressed air

3. Suction cup surface sleeve

4. Reduce the height of the suction cup and glass, and reduce the stroke.

5. Reduce the Na2O content in glass

6.If the suction cup marks on the processing surface are severe, it is recommended to use the form of grabbing the glass on the opposite side. Generally, the suction cup print is more noticeable after coating.

In addition, there was no suction cup mark on the hollow glass before, but after a few months, it was discovered that there was suction cup mark

Possible reasons for this issue:

1. The power supply of the vacuum pump is disconnected, and when reusing it, the previous rubber strip becomes damp and moldy due to the humid air in the new environment, resulting in adsorption force;

2. The movement of the partition strip. Some poor quality spacers may be sandwiched between two pieces of glass due to displacement during use, and as temperature and humidity change, they may absorb or release some water between the two layers of glass, forming a vacuum state after repeated use.

3. The impact of product storage conditions and transportation processes. If the product is not stored in a cool, ventilated, dry place or if it is bumped, it may also affect the quality of the product.

To avoid this situation, it is recommended to purchase regular brand insulated glass products, while also paying attention to proper storage and transportation