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With the targeted introduction of fillers in testliner or kraftliner products manufacturers can achieve cost benefits and increase capacity manufacturers can achieve cost benefits through increased production or energy savings even at todays full load capacities This also has a continued positive effect on product sustainability. By selecting suitable spherical fillers such as calcium carbonate very positive results can be achieved even at low volumes of between 3 and 6 . Tests have proven the feasibility of increasing production or saving production costs while having as little impact on product quality as possible Increased production output Reduced steam consumption Low impact on strength properties such as the short compression test SCT ring crush test RCT or burst resistance Reduced porosity Bendtsen In contrast to fine papers where high filler volumes some far in excess of 10 lead to increased porosity these results show a more compact structure with reduced porosity. A possible reason for this is the improved drainage capacity of the fibrous suspension in the wire section and a more homogeneous sheet in general with a more uniform starch absorption. Consequently a significant reduction in glue consumption can be expected in the further processing of the product which brings with it additional cost benefits. Significant improvements in brightness whiteness and chromacity were not observed with the volumes used. CASE STUDY Results of practical trials at Thurpapier Model AG Various filler qualities were tested in a two-part practical trial. In the first part 6 and 4 gm of fresh filler was added with a base weight of 100 gm. At a constant production volume it was possible to reduce the steam pressure for the dryer section by 5 and 3 respectively. Strength properties such as SCT RCT or burst resistance did not change significantly. Porosity was reduced by around 5 . WORLD PULPPAPER 49 100 100 Production th Steam Pressure bar Reference - 18 100 100 Production parameter 100 94.1 97.8 93 94 95 96 97 98 99 Trial - 24 Trial - 22 100 100 Short Compression Test CD kNm Ring Crush Test kNm Reference - 18 96.6 97.4 Quality parameter 100 90.0 93.3 89 90 91 92 93 94 95 96 97 98 99 Trial - 24 Trial - 22 100 Burst Strength kPa Air Permeability Bendsten mlmin Reference - 18 94.8 96.6 Quality parameter 100 95.2 95.5 Trial - 24 Trial - 22 100 93 94 95 96 97 98 99 All percentages in the key relate to the determined total ash content