Causes of Curly Characteristics
The curling characteristics of Clear Cellophane Round Bottom are mainly due to the combined effects of internal stress of its material and environmental factors. Cellophane usually has a certain directionality. During the production process, such as stretching, drying and other processes, the molecular chains will be aligned in a specific direction, thus generating internal stress. When this internal stress is unbalanced, it will easily cause the round bottom of the cellophane to curl. In addition, changes in ambient humidity have a significant impact on its curl. Cellophane has a certain degree of hygroscopicity. In a high-humidity environment, it will absorb water and swell. The degree of moisture absorption in different parts may be different, which may cause curling. In a low-humidity environment, cellophane may shrink due to loss of water, which will also cause Causes curling.
Effect of curl characteristics on use
Curly Clear Cellophane Round Bottom will bring a lot of inconvenience to its application. In the field of packaging, excessive curling may lead to loose fit, affecting the sealing and aesthetics of the packaging. For example, when used in food packaging, gaps may appear in the curled area, allowing air or moisture to enter and accelerate food deterioration. When used as labels or decorative materials, curling will make it difficult to stick flat, affecting product display and reducing brand image. Moreover, severe curling may cause problems such as paper jams and equipment clogging during processing, reducing production efficiency and increasing production costs.
Suitable storage conditions
In order to reduce the curling phenomenon of Clear Cellophane Round Bottom, the control of storage conditions is crucial. First of all, a relatively stable humidity environment should be maintained. It is generally recommended that the humidity be controlled between 40% and 60%. Warehouse humidity can be adjusted by using a dehumidifier or humidifier to avoid large fluctuations in humidity. Secondly, the temperature also needs to be appropriate to avoid too high or too low temperatures. The ideal storage temperature is around 20℃-25℃. High temperatures may accelerate the aging and deformation of cellophane, while low temperatures may make it brittle. In addition, the cellophane round bottom should be prevented from being squeezed or bent during storage. Try to place it flat or hang it for storage to reduce the impact of external forces on its shape.
preventive and corrective measures
In addition to controlling storage conditions, some measures can be taken to prevent and correct curling. During the production process, process parameters can be optimized, such as adjusting the draw ratio, drying speed, etc., to reduce the generation of internal stress, thereby reducing the possibility of curling. For cellophane round bottoms that have curled, you can use the reverse curling method to correct them, that is, place the curling direction in the opposite direction for a period of time, and use the memory of the material to gradually restore it to a flat shape. Humidification or dehumidification methods can also be used to adjust the moisture content of the cellophane in a targeted manner according to the specific curling conditions to restore it to a relatively flat state. However, this method requires precise control of the humidity change range to avoid excessive moisture absorption or excessive moisture absorption. dry.
