Pulp Technology

Cooking Technologies

Lenzing Technik provides process technology, equipment and services for the sulfite as well as for the sulfate (Kraft) pulp industry.

Cooking Technologies

Technology for production of paper grade pulp.


  • Improves yield, pulp homogeneity, strength and bleachability
  • Increases pulp production without additional digesters
  • Reduces production costs
  • Accepts bad chip quality
  • Applicable for retrofits and green-field installations

In detail

Continuous batch cooking (CBC) combines the advantages of batch operation with the continuous preparation of cooking liquors. The basic concept is to prepare all the process-related liquors in the tank farm using different tank-to-tank circulation loops.

CBC is the only displacement technology allowing a consistent and even alkali profile throughout the impregnation and cooking steps. Quick heating to temperature and the unique alkali profile are the main keys for the significantly reduced cooking cycle time and for improvement in pulp quality.

VISCBC is the process for dissolving grad pulp manufacture implementing steam pre-hydrolysis followed by a neutralization step. CBC’s special liquor management shortens the cooking cycle time and boosts capacity while improving pulp quality and yield. Quality benefits extend to pulp homogeneity, strength properties and bleachability.

CBC utilizes minimum equipment, thus saving investment costs and simplifying operation and process control. Separate digester circulation systems and circulation heat exchangers are no longer required.

The specialists of Lenzing Technik have extensive know-how in design, engineering, construction and optimization of digester plants. Their experience in combination with the company's competence in project management and contracting ensures superior project realization.

Discontinuous cooking technology for production of viscose grade pulp.


  • Excellent pulp quality
  • Reduced energy consumption
  • Low production cost
  • Accepts bad chip quality

In Detail

The VISBATCH® process is the latest technology for the manufacture of dissolving grade pulp according to the sulphate process.

This discontinuous process has been energy- and process-optimised. Furthermore, this process has been successfully solved the environmental problems, such as air (odour) and water pollution (prehydrolysate), commonly encountered in this field.

Raw pulp produced by the VISBATCH® process features highest quality in terms of bleachability and further processing. The process itself is characterised by the wide number of wood species which can be used.


… and components

Automated periodic measurement of extinction of sulfite cooking liquor in the digester.


  • Optical transmission measurement
  • Measuring range: 10 - 50 extinction points
  • Accuracy: +/- 0.5 points per calibration
  • Sampling frequency: maximum 3 per minute including sample preparation

In detail

In sulfite pulping, the extinction of the cooking liquor is a key factor in determining the end point of the cooking process, and therefore, in observing the quality of the desired product.

TRACK 510 is impressive due to its exceptionally high rate of automation for continuous measurement of the rate of extinction of the sulfite cooking liquor. What makes this device unique is the continuous detection of the extinction rate of the sulfite cooking liquor.

With TRACK 510, product quality can be improved as a result of constantly recording actual values. It is also possible to incorporate the data in a DCS and there is no need to take samples by hand, to name just some of the most important advantages.

The main advantages of the automated system are frequent sampling, accurate measuring and possible integration into the DCS.


  • Feasibility studies
  • Consulting services
  • Process engineering
  • Basic and detail engineering
  • Project management
  • Supervision of erection
  • Startup assistance and commissioning
  • After sales service
  • Training


Lenzing Technik GmbH
Werkstraße 2
4860 Lenzing

Phone: +43 (0) 7672 701-0
Fax: +43 (0) 7672 968-58