b'If a shoe press has tilt ability, the pressure profile along the length of the shoe can be adjusted for the desired sheet properties.Figure 4. Dynatex II.of the press fabric while maintainingtrended lower than 150 millimetersnip pressure, just like it does with a the necessary water balance aroundover the years, with some shoes beingconventional roll press.This leads to the loop.under half of that length.Likely thea limitation in the linear load that the biggest transformation however is indryer can safely allow before damage EVOLUTION OF SHOE PRESSES IN TISSUE the form of hybrid Tissue machines,occurs, typically around 90-100 kN/m The first shoe presses on Tissueand how they incorporate their shoeon a cast iron Yankee dryer.With machines consisted of a steel shoe,press operation.On these newerthe introduction of stainless steel with the press nipped up against theconcept layouts, the shoe press is notYankee dryers, this load value can Yankee dryer.The shoe lengths in thenipped up against the Yankee like itbe increased to some extent, up to machine direction were, and continuehad been historically, but is ratheraround 150 kN/m safely but not much to be approximately 150 millimeters ormore of a free standing press likemore than this.With a free standing less, which is noticeably shorter thanyoud see in packaging and publicationshoe press, linear loads upwards of shoe presses in coarser paper grades. machines.Instead of pressing up600 kN/m are seen in practice, which Like all other aspects of a Tissueagainst the Yankee, the press hasallows for higher peak pressures in the machine, the shoe presses themselvesa traditional hard counter roll.Thisshoe press nip and higher post-nip have evolved in a variety of ways. free standing type of shoe press cansolids at a given speed.There is then First, not all shoe presses are steelallow for much higher line loads thanthe Tilt feature that some shoe presses anymoresome consist of a polymerica traditional shoe press against thepossess.If a shoe press has tilt ability, block that can conform to a given nipYankee.Because the Yankee is athe pressure profile along the length condition.In addition, the machinethin shelled, heated pressure vessel,of the shoe can be adjusted for the direction lengths of the shoe itself havethe surface will deform from thedesired sheet properties.Keeping a TISSUE TECHNOLOGY INTERNATIONAL95'