Cresent Former Forming Fabric

Designed Specifically for Cresent Former Tissue Paper Machine

With a unique design, Hengta was developed to help tissue-makers increase their productivity and performance. The combination of “High Fiber Support” and “High Drainage Capability” offered by the cresent former forming fabric reflected in benchmark performances on over 100 high speed tissue machines worldwide. It also offers improved sheet formation by reducing both “Pin Holes” and “Fiber Carry Back.” For these reasons Hengta's cresent former forming fabric has received high accolades from many customers.

Crescent Formers is the ultra-fast formation of the sheet. As the furnish is injected via the headbox, the impingement is captured and formed in the fabric instantaneously. Within this ultra-fast forming process, critical sheet quality properties, such as formation, tensile strength and porosity, must be developed. Hengta's research team reveals that the ideal forming fabric for high-speed machines should provide two performance-specific attributes -“Very High Fiber Support” and “High Drainage Capability under hydraulic load.”

Better Drainage

Achieving better drainage is Hengta's top priority throughout its design processes. In this designs, the warp is used as the binding yarn that brings together the sheet side and machine side layers. Because of this weave structure, the design offers immense flexibility to improve sheet side mesh structure and yarn diameter that are critical to ensuring required grade and property. In a common SSB (Shute Supporting Binder) type triple-layer design, by contrast, the weft is used as the binding yarn between sheet side and machine side layers. 

Better Fiber Support

Special design allows for a significant increase the number of shute yarns. One important result of this is enhancement of fiber support properties. While designing the cresent former forming fabric, our R&D team focused on fiber length and orientation.  A key component of the furnish, the length of short fibers ranges from 0.25－1.5mm with an average approximately 0.9mm. Based on the finding that fibers >0.4mm occupy over 96% of all fibers including NBKP (long fibers), the team designed the weft yarn pitch so that the sheet surface can be formed over two weft yarns for fibers >0.4mm Fibers >0.60mm, which occupy over 80% of the total furnish, are formed over three shute yarns. This results in a tissue fabric structure with stable fiber support.

For the paper side, our R&D team designed a long float yarn system (Length: 0.96mm), using a ratio of one sheet side shute to three warp yarns (1/3 structure, also referred to as “Satin Weave”). This long float yarn system greatly improves MD fiber orientation (a key characteristic in tissue paper). This creates a huge advantage in terms of strength in the formed sheet. 

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