Corrugated Roller Heating Type and Recovery of Condensate

A corrugating roller is a set of heating elements, which are electrically heated, gas fired, oil heated, and ordinary steam heated corrugating rollers, wherein the steam heating is fast due to its high heat transfer rate during heat exchange, and the temperature is stable and easy to control (saturated steam is specific The temperature and total heat content under pressure are fixed and unique characteristics, and can provide the same amount of heat stably within the unit time and unit area. Therefore, it is the best heating method for a continuously produced corrugated board production line.

The condensate recovery system in the conventional steam heating corrugating roller is siphon type. When the corrugating roller is in operation, the base paper is in continuous heat exchange with the base paper. After the latent heat is released, the steam is reduced into condensed water, a layer of water film is formed on the inner wall of the roll and gradually thickened, and the condensed water is continuously discharged by the pressure of the steam through the siphon pipe. This structure is simple and convenient, but the liquid water film formed on the inner wall of the roller is bound to hinder the heat transfer efficiency of the steam. When the corrugating roll stops running, the condensed water will accumulate on the bottom, and the corrugating roll will deform and bend due to the temperature difference between the upper and lower parts. In the early stage of re-operation, a lot of waste products will appear and cause uneven wear of corrugating rollers.

Each characteristic fast heating and condensing water anti-accumulation quick-discharge structure is the main characteristic of high quality corrugating roller products commonly used in the world. The thermal energy groove type condensate recovery system separates the grooves on the inner wall circumference of the corrugating roller so that the condensate flows to the deeper annular groove at one end and is discharged by the siphon pipe. Since the groove makes it difficult to form a water film on the inner wall, it will not accumulate water at the bottom when it is stopped, and the heat exchange area is increased, so the heat transfer efficiency is improved, and the deformation of the corrugating roll at the time of shutdown is avoided.

The drying dynamic system has three arc-shaped valves in one arc groove at one end of the corrugated roller body. During operation, the centrifugal action makes the valve piece stick to the outer wall of the arc groove, the drainage hole is opened, and the condensed water is introduced into the arc groove through the conical surface. Drain hole inside. When shutting down, gravity causes the upper valve plate to close the drainage hole and the lower valve plate opens the drainage hole to achieve no water accumulation at the bottom. Among them, the use of peripheral heating systems is better. Regardless of whether the corrugating roller is in operation or stopped, the high-speed steam flow continuously discharges the condensate due to the effect of steam pressure, and the corrugating roller will not be heated due to condensation. All causes deformation, avoiding abnormal wear of waste paperboard and corrugated rolls and pressure rolls due to the deformation of the corrugating roll when it is stopped and then re-operating, especially on high-speed production lines (the representative German BHS is more representative. ). The evenly divided heating holes on the wall of the roller body increase the area of ​​heat exchange, and the heat transfer efficiency is very good. Various types of corrugating rollers have no problem in China's manufacturing technology, such as peripheral heating systems. Many heating rollers in the plastic industry are such structures, but the promotion of this type of corrugating roller also needs to be supported. Rotary joints.