How to judge the blow-up ratio of film blowing machine

The blow - up ratio of a film - blowing machine can be judged in the following ways:

1. Based on product specifications

• Measure the film thickness: Use a professional thickness gauge to measure the thickness of the finished film at multiple points. Then, according to the known thickness of the raw material film before blowing, calculate the blow - up ratio using the formula: Blow - up ratio= (finished film width × finished film thickness)÷(raw material film width × raw material film thickness).

• Measure the film width: Use a measuring tool to measure the width of the finished film accurately. At the same time, know the width of the original film, and calculate the approximate blow - up ratio combined with the change in film thickness.

2. Through machine parameters

• Extruder and die settings: Modern film - blowing machines usually have parameter settings for the extrusion volume and die size. By referring to these settings and combining them with the actual size of the produced film, the blow - up ratio can be estimated. However, this method needs to consider the influence of factors such as material rheology and machine operation stability.