Reasons for uneven thickness of stretch film
PE stretch film is an industrial film packaging product with high tensile strength, high elongation, good self-adhesiveness, and high transparency. It can be used for manual stretch film and machine stretch film, which can be widely used in centralized packaging of various goods. There are thick and thin PE stretch films, and some have uneven thickness. What causes the uneven thickness of the product? I will share with you today. The specific reasons are mainly as follows:
1. The temperature of the die mouth is high or low, and the distribution is uneven, so that the thickness of the stretched film after blow molding is uneven. The temperature of the die mouth of the machine head can be adjusted to make the temperature of the die mouth uniform;
2. Die gap is not uniform, some parts have a larger gap, and some parts have a smaller gap, resulting in more or less extrusion, resulting in inconsistent stretch film thickness, some parts are thin, some parts are thick , At this time, we only need to adjust the gap between the die mouth of the machine head to ensure uniformity everywhere;
3. The inflation ratio and traction ratio are inappropriate, which makes it difficult to control the thickness of the film bubble. The inflation ratio and traction ratio can be adjusted so that the thickness of the stretch film produced is uniform;
4. The air supply volume around the cooling air ring is inconsistent, resulting in uneven cooling effect and uneven thickness of the stretched film. At this time, the cooling device needs to be adjusted to ensure uniform air output from the air outlet;
5. If the traction speed is not constant and constantly changes, this will also cause the thickness of the stretch film produced to be uneven. At this time, check the mechanical transmission device to keep the traction speed constant.
The above is the analysis of the reasons for the uneven thickness of the PE stretch film, I hope it will be helpful to you. If you want to know more information, please pay attention to our website. If you have a demand for stretch film or packing tape products, please contact us or leave a message online.
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