Foshan Danqi Paper Products Co., Ltd. takes you to learn about the design of the concave ring groove on the upper and lower parts of the iron hoop paper bucket:

To enhance the strength of the paper drum, it is fixed on the drum with a concave ring groove rolled at the lower mouth, also known as a drum hoop. The pole clamp at the barrel mouth is called the upper barrel clamp, and the lower (bottom) barrel clamp is called the lower barrel clamp.
The main functions of the upper barrel hoop are:
① Ensure the strength of the paper bucket and maintain the roundness of the bucket mouth.
② Strengthening the closure device can ensure good positioning and interchangeability between the lid and the mouth of the barrel.
③ Position the mold of the paper barrel forming equipment (sealing machine). The function of the lower barrel hoop is to fix the barrel body and the plywood into a solid whole. Therefore, the shape and size design of the circular arc of the barrel hoop groove have a great impact on the quality of the paper barrel. The designed barrel hoop groove is too deep and has a small arc curvature, which makes it easy to crush the barrel body during the molding process; If the groove of the lower barrel hoop is too shallow and the arc curvature is too large, it directly affects the connection between the bottom structure of the barrel (and the barrel body), and during the process of forming and sealing the bottom, the deformation of the steel strip ring is large, and the amount of iron plate rolled to the barrel body is relatively small, resulting in a weak bond between the cardboard and the plywood. Therefore, when designing the arc shape and size of the upper and lower hoops of the paper barrel, various factors such as the strength of the selected cardboard, the thickness of the plywood, and the equipment used during the process of forming should be comprehensively considered.