Even though “soft tissue” varies from person to person, and country to country, softness is a strict market request for many specific tissue grades and premium quality productions, such as napkins, towels and hygienic paper. Tissuemakers around the world try to produce tissue paper in order to comply with the end-users feeling and requirements. In order to get the best performances in terms of softness, there are several actions that tissuemakers typically perform:
- Selection of the right cellulose fibers (eucalyptus and northern bleached softwood kraft);
- Selection of the correct ratio short/long fibers (usually 60-70% short, 30-40% long);
- Use of specific production machinery/systems;
- Use of specific blade (such as ceramic) and creping angles;
- Reduction of refining energy;
- Use of specific lotions or additives to chemically modify the hand feeling of the tissue paper;
- Use of Enzymes;
- And many others.
There is another key point which is often forgotten or underestimated: Yankee Cylinder Additives. NCR Biochemical has been studying for many years a combination of specific yankee creping agent, release agent and, if necessary, modifier. Our package is able to increase the softness level of the paper produced by working on the sheet surface. The specific coating programme does not affect the paper mechanical properties and it works in combination with any other action that tissuemakers may take (listed above). Our package is easy-to-manage, it enhances the final result thanks to its synergic effect with other parameters, such as fibers, chemicals and mechanical actions. Our technicians collaborate with tissuemakers to coordinate and sum the actions together, in order to obtain the best softness performances. Several case studies can be reported, such as the one from a mill in North of Europe which we briefly describe here below:
NCR Biochemical wants to be regarded as a benchmark reference point in the international chemical industry
- Tissue machine speed 1380 m/min;
- Toilet grade 21 gsm;
- Crepe ratio 17%;
- Target: to achieve very soft paper on toilet grade 21 gsm;
- Machine setting: everything was set to get the highest softness;
- The Yankee Coating Package was already managed by NCR Biochemical;
- No dosage of softening agent in the mass during the test.
The yankee coating programme plans to use a brand new specific base coating additive (Biofilm 446) dosed at 2 mg/sqm and a new release agent (Biolube 885A) dosed at 9 mg/sqm. Only two products were used because, as it often happens with NCR’s coatings, the modifyer is already present inside the coating additive.
A significant increase of the paper softness was achieved by using the new coating package, comparable to the use of a specific softening additive inserted in the cycle, with a global reduced cost/ton of produced paper. Checking the paper with a microscope, we can notice that, in the paper of the first reel after the blade change, the number of “crepe” (or “waves”) is higher using the new combination of products (Biolube 885A and Biofilm 446) compared with previous standard treatment. Picture 1 and Picture 2 show what described above.
The mechanical strength of the paper sheet was kept unchanged during all production process, while previously, by using softeners in the mass, the value dropped significantly.
NCR Biochemical is able to set this specific coating programme for different type of tissue paper and cycles, adapting the results to customers’ requests.
Our approach to the Yankee Cylinder
We, at NCR Biochemical, are specialized in the production of tissue-making additives that match the latest mechanical innovations. We have been dedicating the last 15 years to develop technologies thus allowing our customers obtain high performances at convenient costs and lowest possible production losses. Thanks to a wide team of chemists, microbiologists, paper makers and engineers, we have developed an holistic and global method to help tissue producers increase their performances.
NCR team studies every element of the cycle and finds out the best solutions combining four key factors: latest chemical technology, knowledge of our experts, in-depth know-how of the applications, innovative dosing equipment. The final and unique goal is to drive customers to success. Our specialized team will always manage the problems of Tissue mills like their own ones.
Our passion for tissue paper brings us close to our customers and makes them satisfied and enthusiastic.
We provide technology, expertise and knowledge; this means our customers get added value