16 HEIMBACHINDUSTRY NEWS
Pulp Paper & Logistics
Photo 5: The right way to position the laminar water jet: at an angle of 100 degrees
fabric and should work at the right distance (photo 5). Result: perfect fabric conditioning – and the highest possible cleanliness.
Position of edge trim nozzles Equally important is the positioning of the edge trim nozzles, where possible located above the last slot of the high- vacuum suction zone. If edge trim
nozzles are to work perfectly, key parameters are correct size, appropriate diameter and flawless functionality. Figures 1 and 2 make clear what’s crucial: Correct nozzle adjustment together with appropriate angles, and the correct position of the ‘twin nozzle’. Its tilt must be observed, the angle towards both machine and cross machine directions.
Photo 6: Primoselect forming fabric (right), shown with two conventional multi-layer forming fabrics, offers minimal fibre carry
Fabric design makes a difference The right choice of forming fabric also plays an important role in forming section hygiene. To this end Heimbach has developed the Primoselect design which is being quickly adopted across all markets and grades. It has numerous benefits, primarily
due to its open structure (Figure 3). The much lower density ensures optimum de-watering, even when a reduced vacuum is applied, and the low void volume reduces water and fibre carrying (Figure 4). The result: A fabric that runs noticeably cleaner than conventional multi-layer forming fabrics (photos 6-8).
Photo 7: Water carry with normal multi-layer forming fabric and water carry with Heimbach’s Primoselect July/August 2017
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