Product Introduction
The Bauer fiber classifier operates on a stepped screening principle. A pulp suspension is introduced into the classifier and flows sequentially through four chambers equipped with screens of different mesh sizes. Under the agitation of a stirrer rotating at 580±1 r/min, fibers are retained on the corresponding screens according to their length. By controlling the water flow rate (0-20 L/min) and screening time (0-9999 min), standardized screening is achieved. After screening, the fibers retained on each screen are collected, dried to constant weight, and reported as a mass percentage of the original test sample for each mesh size. The instrument is constructed from 304 stainless steel for corrosion resistance and easy cleaning, with a robust and stable structure and simple operation.

Key Features 
Multi-Standard Strict Compliance Complies with GB/T 2678.1-1993, TAPPI T233 cm-95, and Nordic SCAN M6 methods, meeting different domestic and international testing requirements.
Four-Stage Stepped Screening Four screening chambers arranged in a stepped configuration enable continuous and efficient separation of fibers of different lengths for accurate fiber length distribution analysis.
Wide Adjustable Flow and Time Water flow rate adjustable from 0-20 L/min (display accuracy 0.5%R), and screening time adjustable from 0-9999 min to accommodate different standards and sample needs.
Multiple Screen Combinations Available Factory default medium-long fiber screens (14/28/48/100 mesh), with optional long fiber (10/14/28/48 mesh) or short fiber (28/48/100/150 mesh) combinations.
304 Stainless Steel Construction Main body made of 304 stainless steel for corrosion resistance and easy cleaning, ensuring long service life and sample purity.
Precise Stirrer Speed Control Stirrer speed of 580±1 r/min ensures uniform fiber dispersion during screening, improving accuracy and repeatability.
Large Capacity Design Screen chamber capacity of 10 liters (per stage) accommodates pulp suspensions of varying concentrations.
Robust and Durable Structure Net weight of 130 kg with a solid, stable structure suitable for high-frequency, long-term laboratory use.

Main Technical Specifications 

Recommended Screen Combinations

FAQ
1. What is the difference between the Bauer fiber classifier and a freeness tester?
The Bauer Fiber Classifier separates fibers by physical screening and determines fiber length distribution and weight-average fiber length. The freeness tester evaluates beating degree by measuring the drainage rate of a pulp suspension. Both assess pulp quality from different perspectives and complement each other.
2. How do I select the appropriate screen combination?
Screen selection depends on fiber length: long fiber pulps (e.g., softwood) are best screened with 10/14/28/48 mesh; medium-long fiber pulps (e.g., hardwood) use the factory default 14/28/48/100 mesh; short fiber pulps (e.g., recycled pulp) are recommended with 28/48/100/150 mesh.
3. How should water flow rate and screening time be set?
Flow rate and time should be set according to the standard method adopted. For example, Nordic SCAN M6 specifies a 10g sample, 15min water flow, and 10L/min flow rate. Parameters are flexibly adjustable within the ranges of 0-20 L/min and 0-9999 min.

4. What are the requirements for test water?
Clean tap water or distilled water should be used. Water temperature should be kept constant to avoid affecting fiber morphology. The instrument requires a continuous water source; a stable water supply system is recommended.
5. How are fiber samples processed after screening?
After screening, collect the retained fibers from each screen separately, rinse them into containers, dry to constant weight, and weigh. Report the result as a mass percentage of the original test sample for each mesh size.
6. Does the instrument require regular maintenance?
Clean the screens and chambers promptly after daily use to prevent fiber residue. Periodically check that the stirrer rotates freely and that the screens are not damaged. The 304 stainless steel construction is corrosion-resistant and requires simple maintenance.

After-Sales Service
Established in 2007 and with nearly two decades of experience, Shandong Annimet Instrument Co., Ltd. is a professional manufacturer integrating R&D, production, and sales of laboratory testing and sample preparation equipment. Quality is our foundation. We are your bridge from concept to reality. We deliver more than just instruments — we deliver confidence. This Bauer Fiber Classifier comes with a 12-month warranty and lifetime technical support. Our professional team offers 24/7 service response, free installation guidance, operation training, and fiber screening method consultation. For any inquiries, please contact our customer service team; we are dedicated to providing comprehensive pre-sales, in-sales, and after-sales support. Hotline: 400-9933-057, Email: anmt_test@126.com.