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Why can't the cling film stick to the metal container?
October 14, 2019Because the metal product is a kind of conductor, it can make the charge on the surface of the wrap film be lost, and the potential difference from the surface of the container disappears, and the wrap film can not stick to the metal container.
The cling film is a plastic packaging product which is usually produced by polymerization using ethylene as a master batch. Generally used for microwave food heating, refrigerator food preservation, fresh and cooked food packaging. It is very common in life and is widely used.
Generally, the plastic wrap is not sticky, but it is sticky. This is because the wrap film is soft and the inside of the cling film has a charge. These charges can cause adsorption between the cling film and the container. This reaction is similar to static electricity. Phenomena, such as rubbed plastics, can attract paper dust so that the wrap film "sticks" to the surface of the object. In this way, the wrap film can prevent the water from dispersing and sealing, and can prevent the food from losing its original scent during storage, isolating the air, and preventing the food from oxidizing.
But the cling film can't stick to the metal container. This is because the metal product is a kind of conductor, which can cause the electric charge on the surface of the wrap film to be lost, and the potential difference from the surface of the container also disappears, so the cling film cannot stick to the metal container. Therefore, the cling film can only be used together with the insulator material to maintain the freshness, because the insulator can retain the electric charge on the surface of the cling film.
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How Manual Cling Film Machines Improve Food Packaging EfficiencySeptember 15, 2025
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