Convolute cores: as used for textile and roller blind tubes.
In the field of cardboard tubes and cores, there are two main varieties. The best known one, which we see in many bathrooms, is the spiral wound core of cardboard tube. You see them in use for toilet tissue and roll. They are suitable for lightweight use. The ones we are focusing on are convolute cores.
Convolute cores have a high beam strength. They are manufactured from a single sheet of cardboard and designed for heavy loads. You usually see them as the cardboard core of your Axminster carpet. On manufacture, the left hand side of the sheet is rolled over to the right hand side of the sheet of cardboard. Unlike spiral core tubes, they do not disintegrate.
They are also suitable for smaller cardboard tubes as well as lengthy ones suitable for carpets or window blinds. Convolute cores can be used in the production of bobbins and cotton reels. The transportation of threads and carpets are kept tightly wound. The walls are thicker compared with their spiral wound equivalents. For travelling over great distances, they are a superior option.
Convolute versus Spiral Cores:
Convolute cores are best for heavy loads;
Spiral cores better for lightweight applications;
Great for small tubes as well as gigantic ones;
The convolute core is more rigid, being made from a single sheet of cardboard;