Refractometric and Gravimetric Monitoring of Cold Pad Batch Alkali Ratios
Refractometric and gravimetric tracking stabilizes cold pad batch alkali ratios, preventing reactive dye hydrolysis and securing shade repeatability.
Optical Refractometry
Light Refraction
Photonic measurement techniques utilize the bending of light as it passes through a liquid to determine the concentration of dissolved solutes. Through optical refractometry, a prism measures the critical angle of refraction at the interface between the glass and the sample. Readings correlate directly to the refractive index, which indicates the purity or strength of chemical solutions in a mill.
Index Determination
Light sources inside the device transmit a beam through a high-index prism into the fluid. In optical refractometry, the portion of light that does not pass into the liquid reflects back to a linear image sensor. The position of the shadow line on this sensor changes as the chemical concentration of the bath fluctuates.
Modern digital units convert this position into a brix or baumé reading for the operator.
Dissolved Solid
Textile finishing lines use these sensors to monitor the application of flame retardants or water repellents. Maintaining a stable reading through optical refractometry ensures that every meter of fabric receives the same level of protection.
Equipment Sensitivity
Opaque or highly turbulent fluids block the light path and prevent a clear reading. If the liquid contains suspended solids like pigments or lint, optical refractometry may produce an average value that does not represent the dissolved chemical state. Frequent cleaning of the prism face is necessary to prevent the buildup of films that distort the light angle.