Internal Dropleg (IDL) Disc Filter

Beloit Corp. announces the development of an internal dropleg (IDL) disc filter that reduces installation and operating costs compared to conventional dropleg disc filters. Developed to provide paper manufacturers with technology that reduces overall cost per ton of pulp, the IDL disc filter reduces the capital investment and operating energy costs for both saveall and disc thickening applications. The IDL disc filter meets these objectives by eliminating the need for elevated placement, eliminating large deaerating filtrate chests, reducing piping requirements and reducing pumping energy.

The filter uses a patented principle of short internal droplegs, which are curved extensions between the disc sectors, and an open core centershaft. Because clear and cloudy filtrates discharge directly into separate core ponds, a more precise split between the cloudy and clear filtrate portions is achieved. With conventional dropleg disc filters, cloudy and clear filtrates mix in the core channel, reducing the clarity and volume of clear water and limiting the speed of the machine. The sharper split of filtrates that is achieved with an IDL disc filter results in higher quality and a larger volume of clear water, as well as faster rotation speed for increased filter capacity.

Since the IDL disc filter does not require external droplegs to generate vacuum, it can be installed anywhere. This feature can be very beneficial for projects with considerable space limitations, such as expansion rebuilds of older paper machines.

Beloit Corp., 500 Lake Cook Rd., Suite 350, Deerfield, IL 60015. Tel: 847-236-6700; Fax: 847-236-6701.