Under the term tube winding, 3 ways of winding can be summarized: straight winding, conical winding and spiral winding.
The process is as follows. First, ranging from 2 to max 30 cardboard plies are glued together, depending on the desired tube wall thickness and strength. These are spirally wound on a mandrel and fastened by means of 1 or 2 rubber belts.
Thereafter the tube is cut to the desired length. The crush value (the force required to crush the tube) of the tubes is strongly influenced by the type of paper and the number of plies. Nevertheless, the type of adhesive can also have an influence on the crush value. Crush values are determined after thorough drying of the tubes.
The tubes must have a high initial strength otherwise deformation occurs during the stacking and the storing of the tubes. The initial strength is dependent on the moisture content of the tube and the setting speed of the adhesive.
