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Under the action of a certain temperature and pressure over a period of time, adjacent layers of plastic film may sometimes adhere to each other; if high winding resistance is observed, it indicates that the roll film has blocked. When the curing temperature in the curing room is too high, the roll film is also prone to blocking and must be rewound before normal use. These phenomena indicate that packaging materials have tackiness; in fact, this tackiness is caused by the thermal motion of chain segments. Causes of Plastic Film Tackiness If the ambient temperature is above the T