At present domestic use paper barrel, its structure is a composite multi-layer kraft paper, adopt the volume manufacture process, selection of craft paper quantitative in 250-350 GSM, in order to ensure the paper barrels of strength and rigidity, generally cardboard ring crush strength of the raw materials for quantitative 300 g/m2, burst index is not less than 3.0 kpa, horizontal folding degree is not less than 50 times, moisture content is not more than 10%.

The strength of the drum, in addition to the related to raw materials, and the thickness of the drum and the role in related to the size of the drum axial force. Established in the material cases, lateral pressure strength greater than 4000 n paper drum, puncture strength greater than 10 j.

Paper paper barrel with the size of the barrel distortion of the lateral pressure and is proportional to the diameter, and modulus of elasticity, paper paper barrel barrel is inversely proportional to the thickness and layers, that is, ACTS on the side of the drum pressure, the greater the round Zhou Changyue is big, the drum deformation is larger; Paper barrels of high modulus of elasticity, the layer number and thickness of the deformation is small. Therefore, in the production of paper barrels, to improve the strength, it must increase layer number and thickness of paper drum, when choosing raw materials, should choose cardboard materials of high elastic modulus.

Paper barrels of top and bottom concave ring groove design: to enhance the paper barrels and fixed on the drum, the mouth and roll has a concave ring groove, also known as barrel hoop. Barrel mouth parts on the band called barrel hoop, lower () at the bottom of the barrel under the band called barrel hoop. Barrel hoop on the main functions are: (1) to ensure the strength of the drum, and keep the barrel mouth in roundness. (2) reinforce the closure, can make the barrel and the barrel mouth well location and for the interchange function. (3) the paper barrels of molding equipment (sealing machine). The function of the barrel hoop is fixed barrels and concrete bottom as firm as a whole. So the barrel hoop grooves of the arc shape and size design is reasonable or not, has enormous influence on the quality of paper barrel. Design of barrel hoop too deep and the circular arc is small, easy in the forming process of medium voltage is broken barrel body; Barrel hoop under a shallow and circular radian is too big, will directly affect the bottom structure (the body) and connectivity, and in the process of forming back ShiGang with ring deformation is large, iron roll to the bucket in the volume is relatively small, cardboard and five-layer plywood not firm, so paper barrel hoop up and down in the design of circular arc shape, size, need according to choose the cardboard the intensity and the thickness of the five-layer plywood and process molding equipment is adopted by the many factors such as comprehensive consideration.