POF (Polyolefin) shrink film is widely used in commodity packaging due to its advantages of high transparency, good toughness, environmental friendliness and uniform shrinkage. However, in actual packaging operations, various problems often occur due to factors such as improper operation, equipment parameters mismatch or film quality, which affect packaging efficiency and appearance. This article summarizes several common problems and provides simple and guiding solutions for reference.
1. Film Breakage During Shrinkage
Performance: The film cracks or breaks during the shrinkage process, resulting in unqualified packaging and material waste.
Causes: ① The temperature of the shrink oven is too high, causing the film to melt and break; ② The film has defects such as pinholes, impurities or poor toughness; ③ The product has sharp edges or corners, which scratch the film during packaging; ④ The tension of the film is too large during feeding, leading to excessive stretching.
Solutions: ① Appropriately reduce the temperature of the shrink oven and test to find the optimal temperature range; ② Check the quality of the film, and stop using the film with obvious defects; ③ Polish the sharp edges and corners of the product before packaging, or use protective sleeves for local wrapping; ④ Reduce the tension of the film feeding device to avoid excessive stretching of the film.
2. Poor Adhesion After Shrinkage
Performance: The film does not fit closely with the product after shrinkage, and there is a gap, which cannot play a good role in fixing and protecting the product.
Causes: ① The temperature of the shrink oven is too low, and the film cannot be fully shrunk; ② The speed of the conveyor belt is too fast, and the film does not have enough time to shrink; ③ The shrinkage rate of the selected POF film does not match the product requirements; ④ The surface of the product is contaminated with oil, dust and other impurities, affecting the fit between the film and the product.
Solutions: ① Gradually increase the temperature of the shrink oven until the film can shrink fully; ② Reduce the speed of the conveyor belt to extend the heating time of the film; ③ Select POF shrink film with appropriate shrinkage rate according to the shape and size of the product; ④ Clean the surface of the product before packaging to remove oil and dust.
3. Fogging on Film Surface
Performance: After shrink packaging, the surface of the film appears foggy, which reduces the transparency and affects the display effect of the product.
Causes: ① The temperature of the shrink oven is too high, causing thermal degradation of the film; ② The cooling system after shrinkage is not working properly, and the film cannot be cooled and shaped in time; ③ The humidity in the workshop is too high, and water vapor adheres to the film surface; ④ The quality of the film is poor, and the additives are incompatible.
Solutions: ① Adjust the oven temperature to the appropriate range to avoid overheating of the film; ② Check and maintain the cooling system to ensure that the film is quickly cooled and shaped after shrinkage; ③ Control the humidity in the workshop, and use dehumidification equipment if necessary; ④ Replace with high-quality POF shrink film from regular manufacturers.
4. Deviation During Film Feeding
Performance: During the packaging process, the POF shrink film deviates to one side, resulting in uneven wrapping of the product, and even failure to complete the packaging normally.
Causes: ① The film roll is not installed correctly, and the center of the film roll is not aligned with the packaging machine; ② The guide roller of the packaging machine is skewed or worn; ③ The tension of the film is uneven on both sides; ④ The surface of the guide roller is contaminated, resulting in uneven friction.
Solutions: ① Correctly install the film roll, adjust the position to ensure that the center of the film roll is aligned with the packaging machine; ② Check and correct the guide roller, replace the worn guide roller; ③ Adjust the tension device to ensure that the tension on both sides of the film is consistent; ④ Clean the surface of the guide roller to remove dirt and ensure smooth operation.
Conclusion
Most problems of POF shrink film in actual packaging are related to equipment parameters, operation methods and film quality. By mastering the above common problems and corresponding solutions, and combining with actual operations to adjust and optimize, we can effectively improve the packaging quality and efficiency. In addition, choosing high-quality POF shrink film and doing a good job in daily maintenance of packaging equipment are also important guarantees for reducing packaging problems.
As a professional POF film manufacturer, BRJ adheres to "quality first, precision manufacturing". We produce high-quality POF shrink films with uniform thickness, excellent toughness, high transparency and stable shrinkage. Supported by advanced equipment, strict full-process quality control and professional R&D, BRJ films effectively avoid quality-related packaging issues. Choose BRJ for reliable POF films and worry-free packaging!