TAPPI TIP 0404-20 provides practical procedures for evaluating key physical characteristics of new press fabrics used in paper machine pressing. The document covers basis weight measurement, air permeability testing, void volume determination during compression cycling, and qualitative pressure-uniformity assessment using carbon impressions.
It includes test scopes, specimen requirements, apparatus guidance, procedures, calculations, reporting requirements, polymer density data, example calculations, impression-ranking references, definitions, keywords, safety information, and related TAPPI references. This PDF is intended for paper mills, press-fabric suppliers, laboratory technicians, engineers, and quality professionals who need consistent methods for comparing press fabric properties.
Application Scope: Laboratory and mill evaluation of press fabrics used for mechanical water removal in paper machine press sections.
