The core is a necessary part during production of thermal paper rolls. There are several types of cores used in paper rolls. Basically, they are divided into 2 types according to the material. They are paper cores and plastic cores.
1. Paper core
Paper cores are produced through rolling paper material with glue. They can roll into different sizes. The inner core diameter for thermal paper roll is 13mm, 16mm and 25mm. The thickness of a core is usually at least 3mm to make it strong. Thus the popular sizes are 13x19mm, 16x24mm, 25x34mm.
2. Plastic core
Plastic core is produced within mould. Unlike the paper core, they can not be rolled into different thickness. Their sizes are normally fixed.
Two types of plastic cores are used for thermal paper rolls. One is plastic solid core. The other is honeycomb core.
13x17mm plastic solid core
13x22mm honeycomb core
Plastic cores can be in different colors like white, black, yellow, green, blue, etc.
Last not the least, with the development of technology, cores can be eliminated both for production and usage. Coreless thermal paper rolls are now on the trend. It decreases the production cost and save space for merchant.