Retention & Drainage Analyzer

Model Number

RDA

Features

Retention and Drainage Analyzer makes available to fully automate a paper making process, to describe a paper making facility practically according to the date from automation of paper production processes and measurements of it, to evaluate the effects of an additive in a factory, and to manufacture various kinds of experimental filters, which is applicable to conduct an accurate analysis, to secure a reliability, to save labor costs and test time in a laboratory and quality control service.

Specification

• Mixture Motor Speed : 200 ~ 2500rpm
• Max Vacuum : 500㎜Hg
• Vacuum Flow Capacity : 30ℓ/min
• Paper Sheet Size : 190㎜
• The External Size : H1200 x W640 x D450(Unit:㎜)
• An accessory
  

The following picture is an entire scheming diagram of RDA-HSF.
This picture displays the consecutive pictures of drafting process utilizing the real shape of RDA-HSF

1. Air-pressure cylinder that opens and shuts the peaked cap of paper stock-forming tank.
2. Running part for the mixing treatment of paper stock.
3. Rotative and automatic injector of additive.
4. Paper stock-forming tank.
5. Mixer impeller-typed.
6. Paper-forming tank.
7. Peaked cap of paper stock-forming tank.
8. Lattice that holds forming fabric/wire mesh.
9. Funnel-shaped part that is full of charging water.
10. Drainage Valve.
11. White-water tank.
12. White-water Valve.
13. Data storage computer
14. Control Box.
15. Vacuum Pump.
16. The second valve that connects vacuum tank with pump.
17. The first valve that connects white-water tank with vacuum tank.
18. Vacuum tank.

ⓐ : Entire scheming diagram of RDA-HSF
ⓑ : Picture that shows the mixing treatment of paper stock
ⓒ : Picture that shows the opening peaked cap of paper stock- forming tank.
ⓓ : Picture that shows the opening of paper-forming tank when the forming is completed in the wake of compulsive drainage.
ⓔ : RDA CONTROLLER
ⓕ : PAPER SAMPLE

In order to manage the paper making procedure in an effective way, it is inevitably required to measure and estimate the various changing parameters of process control.
In particular, comprehensive understanding about wet-end part of paper machine (PM), the main decisive stage of important properties of paper and paperboard, is the important key of PM operation.
Appropriate control for this stage with regard to drainage, retention and formation of sheets is very important in terms of productivity and quality of final products.

The existing equipment like CSF tester or DDJ, which generally do not adapt vacuum in dewatering stage, depend entirely on gravity for drainage. However, it is totally different from real PM's condition which use usually vacuum in wet-end part at the suction power of 0.25 bar or more than. Although DDJ can measure the retention of fillers fixed on the fibers, it doesn't realize handsheets. Only the fundamental and special measurement can be done by DDJ. Nevertheless, DDJ is not easy to use, not repeatable (depending on operator) but time-consuming definitely.

KRICT developed a novel handsheet former RDA-HSF (Retention Drainage Analyzer Handsheet Former) with a view to overcome the lots of faults made by existing equipment. Different from FRET, RDA-HSF can provide and control the intensity of turbulence in paper stock introduced into forming tank. By adapting the new agitating system consisted of six impellers, rotating with counter direction each other.

RDA-HSF is also superior to other existing equipments in an aspect of adapting syringe revolver instead of chemical pump as a automatic injector of chemical additives into stock tank. The comparison of performance of chemical additives in wet-end is consisted of measuring drainage, retention properties and formation of paper at the varying addition level and kinds of chemical additives. In case of chemical pump, cleaning of chemical reservoir should be preceded before the change of additives and it cost lots of time and labor consequently. However, by adapting revolver injector for RDA-HSF, disposable syringe can replace the troublesome chemical reservoir and reduction of analyzing time can be accomplished consequently.