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Reduction in Fibre Loss at Drum Thickener

Description

This case study depicts how the optimised size of screening mesh as per process and quality improves the efficiency of the screening system and reduction in fibre losses.

Implementing Industry

Rama Pulp & Papers Limited (Rama Pulp) is engaged in manufacturing various types of papers, mainly cultural and specialty grades. It is a medium scale industry, established in 1980. Products manufactured are Absorbent Kraft Paper & OTC (One Time Carbon) with present capacity of 40 TPD paper production.

Implemented technology / technique

BEFORE:

  • In the previous process, at thickener, the pulp slurry is adjusted for the consistency before processing to next step. 

  • The accept from the thickener proceeds to thickener chest while the reject is passed through the screen with 40 mesh size, due to large mesh size a significant amount of fibre with fines also passes through the screen and reaches to pulper and results in reprocessing of fibre to various production steps leading to the reduction in strength of the fibre as well as increasing reprocessing cost.

  • The presence of fibre in recirculating streams also results in problem of biofouling and unnecessary TSS increase in the filtrate.

AFTER:

  • Industry has installed the screen with 60 mesh size, because of which the fibres leading to pulper has been reduced significantly (the actual quantity is not accounted). 

  • It reduces recirculation and increase in fibre strength by avoiding continuous reprocessing of the fibre thus results in improved paper quality

Economic benefits

The fibre recovery and utilisation in paper making results in reduction in production cost (quantification   is in progress).

Contact details 

Mr. A. K. Sharma (Director); a.k.sharma@ramapulp.com