Roots vacuum pump in paper mill

In small and medium-sized paper mills, most of them use low-speed small paper machines. For example, 1092 single cylinder (double cylinder) round wire machine, 1575 round mesh double cylinder paper machine, 1575 short net double cylinder paper machine, 1575 long net multi-cylinder paper machine, 1760 long net multi-cylinder paper machine. Most of the vacuum pumps that these paper machines used in the past were water ring pumps. With the advancement of technology, energy conservation and environmental protection, in the past ten years, the Roots vacuum pump and the Roots pump have been widely used in the vacuum system of paper machines at home and abroad. Satisfactory results can be obtained by matching the specifications of the machine with the relevant technical requirements of the paper type.rotary_vane_vacuum_pump

The choice of Roots vacuum pumps in the vacuum system of paper machines is based on several reasons:

(1) The effect of vacuum on the pumping speed and paper dryness of different quantitative papers The vacuum degree requirements of different quantitative paper sheets under different dryness. For example, when the basis weight is 24 g/m2, in order to obtain a dryness of 13%, the degree of vacuum must be 160 mmHg, and similarly, when the basis weight is 30 g/m2 and 65 g/m2, a dryness of 15% and 20%, respectively, is obtained. The degrees must be 200 mmHg and 450 mmHg, respectively. As this increases the thickness of the sheet due to the quantitative increase, it is necessary to increase the dryness in order to increase the wet strength of the wet sheet.vacuum-pump-vacuum-thermoforming

(2) Requirements for vacuum system according to the papermaking process From the working characteristics and characteristic curves of the ZBK11 wet four-leaf Roots vacuum pump, it can be clearly seen that the vacuum is in the range of 250-550 mmHg, and the curve is horizontal, and its essence is The pumping capacity of the pump remains essentially the same.

(3) Economical effect of using Roots vacuum pump The performance characteristics of Roots vacuum pump and water ring pump have been described in the previous chapters. What about the economic and technical benefits of the Roots pump and the water ring pump? This is also a concern of the paper industry. Take the practice of paper mills as an example to illustrate the following issues:

Roots vacuum pumps save energy. The Roots vacuum pump is highly efficient and is not generally comparable to a water ring vacuum pump. Rather, it means that the power consumed per unit of pumping capacity (so-called specific power) in the high efficiency zone (with a vacuum in the range of 100-200 mmHg) is much lower than that of the water ring pump. The reason is that the high-efficiency zone of the water ring pump is in the range of 400 mmHg of vacuum. In the paper machine net parts and felts similar to the factory, the vacuum requirements are less than 400mmHg, so the use of the Roots pump is the strength of the pump.Roots_Vacuum_Pump