Flexible PVC biogas storage bags making machine with hot air welding

How to make flexible pvc biogas bag?You will learn from this video.
1.Cutting the PVC fabric in the right size and shape
2.Joint each piece by hot air welding machine
Finally you will get the PVC tube bag.This PVC bladder tube bag not only applied in biogas storage,but also used as flexible water storage tank,inflatable PVC tube parts of inflatable boat,castle,tent etc.
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