Quantifying Longitudinal Dyeing Tailing Gradients in High Speed Continuous Finishing Lines
Dynamic replenishment dosing calibrated to dyestuff substantive affinity factors eliminates longitudinal tailing across high-speed continuous pad dye lines.
Shore Hardness
Indentation Resistance Measurement
Mechanical resistance of rubber and polymeric materials to indentation determines the pressure distribution across squeezed roller nips. This property, measured as shore hardness, describes the hardness of squeeze rollers used in textile pad mangles and coating machines. It affects the quantity of chemical finish or dye solution left on the fabric.
Durometer Testing Operation
Testing involves pressing a standardized steel indenter into the surface of the elastomer under a calibrated spring force. The shore hardness value is read directly from the dial of a durometer, representing the depth of the indentation. A higher number indicates a harder rubber compound that will compress less under load.
Liquid Extraction Efficiency
Mangle nip dynamics rely on the compression of rubber rollers to squeeze out excess liquid from wet fabric webs. When the shore hardness of the roller is too high, the contact area in the nip decreases, leading to uneven moisture extraction and chemical distribution. Adjusting the hardness allows operators to control the wet pick-up percentage of the fabric.
Roller Maintenance Routine
Periodic measurement along the length of the roller ensures that the rubber has not hardened due to age or chemical exposure. This routine prevents edge-to-center pressure variations that could cause shade variation or uneven finishing.