All rayon undergoes a careful inspection as it is wound by machine at the Rayon plants of the DuPont Company. The scene shown here is typical of the operations at the plants near Richmond, Virginia and Old Hickory, Tennessee.
Liquid viscose, which is ripened under carefully controlled temperature, is tested at regular intervals in the process of becoming rayon yarn at plants of E.I. du Pont de Nemours & Company. Here the photograph shows the liquid dripping from a tube to determine its viscosity.
Spinnerets are inspected under a microscope to determine surface scratches and to check the minute holes through which viscose solution is forced to form filaments of rayon yarn at plants of E.I du Pont Nemours & Company. Precision checking for quality and uniformity is standard procedure at DuPont rayon plants.
Bobbins of twisted yarn are checked on creel preparatory to winding on beam for weaving. Each individual strand, called an end, must be wound with meticulous care to insure steady feed in high speed weaving operation. Machine at DuPont's $5,000,000 Textile Research Laboratory at Chestnut Run near Wilmington, Delaware is part of production facilities supplementing research in seventeen physical and chemical laboratory units to diversify and improve uses of company's man-made textile fibers.
In addition to constant chemical checks on the process of manufacturing yarn at the viscose rayon plants of E.I du Pont Nemours & Company, scrutiny is also given to such physical characteristics as the uniformity of denier, elongation, elasticity and breaking strength.