Causes of uneven stretch film thickness-Industry News-Mingye Packing Materials Co.,Ltd

Stretch film has been widely used in various industries. The uneven thickness of the stretch film is one of the main factors affecting product quality. Today Joypack stretch film manufacturer will give you an analysis of the reasons for the uneven thickness of the stretch film. And how to deal with it.

The unreasonable heating temperature setting causes uneven thickness of the stretched film. Since the temperature directly affects the flow pattern of the melt in the die runner and is related to the longitudinal thickness distribution of the product, the heating device and the temperature control device should be checked for damage. Whether the heating temperature is reasonable to ensure the stability of the heating temperature.

The gap of some die buttons is not uniform, the gap of some parts is larger, and the gap of some parts is smaller, resulting in more or less extrusion volume. Therefore, the thickness of the stretched film formed is also different, and some parts are larger. It is thin, and some parts are thick. At this time, we need to adjust the gap of the die buckle of the machine head to ensure uniformity.

The air supply volume around the cooling air ring is inconsistent, resulting in uneven cooling effect, resulting in uneven thickness of the stretched film. At this time, we need to adjust the cooling device to ensure uniform air output from the air outlet. If the pulling speed is not constant , And constantly changing, this will also lead to uneven thickness of the stretched film produced. At this time, check the mechanical transmission to keep the traction speed constant.

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