Introduction of Beating and Freeness Tester

Beating and Freeness Tester is used for the determination of the drainability of a pulp suspension in water in terms of the Schopper-Riegler (SR) number.
The Schopper-Riegler test is designed to provide a measure of the rate at which a dilute suspension of pulp may be dewatered. It has been shown that the drainability is related to the surface conditions and swelling of the fibres, and constitutes a useful index of the amount of mechanical treatment to which the pulp has been subjected
In principle, this method is applicable to all kinds of pulp in aqueous suspension. However, in practice, the Schopper-Riegler test provides acceptable results only if a sufficiently dense mat of fibres is formed on the wire screen. For this reason, the test is not recommended for some extremely short-fibred pulps, such as those from well-beaten hardwoods, as most of the fibres will pass through the wire screen, resulting in anomalous reduction of the SR number. The most reliable results are obtained within the range of 10 to 90 SR number.

Advantages

1. non-corrosive
2. low maintenance
3. Easy to use and clean
4. Stainless steel
5. Robust design

Principle

Draining, through a fibre mat formed during the test on a wire screen, of a given volume of pulp in aqueous suspension into a funnel provided with a bottom and a side orifice. Collection of the discharge from the side orifice in a measuring cylinder, graduated in Schopper-Riegler numbers.

Standards

ISO 5627-1, GB/T 3332, QB/T 1054

FAQs

1. What is the Schopper-Riegler number scale?
   The scale on which a discharge of 1 000 ml corresponds to a SR number of zero and zero discharge to a SR number of100.
2. What is ‘stock’ in pulp beating freeness test?
   aqueous suspension of disintegrated pulp.