Real Time Size Add on Sensing and Adaptive Squeeze Control in High Speed Bast Warp Sizing
Real time microwave sensing and adaptive squeeze roll pressure tuning stabilize bast warp size add-on to maximize loom efficiency and cut yarn breaks.
Shore a Rubber Durometer
Measurement Instrument
Measurement of material resistance to indentation uses a standardized gauge to evaluate the hardness of elastomeric materials. Technicians use the Shore a rubber durometer to test the squeegee and pressure rollers used in textile processing. This handheld device utilizes a hardened steel rod to penetrate the rubber surface under a spring-loaded force.
It provides a numeric value that indicates the suitability of the roll for sizing and finishing applications.
Industrial Calibration
Squeeze rollers with incorrect hardness values alter the distribution of the liquid paste applied to the flax yarns. A soft roller produces a wider contact area with lower peak pressure, whereas a hard roller generates a narrow zone with high pressure. The gauge must be applied directly to the roll surface at multiple points to check for uniform hardness across the entire cylinder length.
Regular testing is required because continuous heat and chemical exposure from the sizing bath cause the rubber to harden and degrade over time. Maintaining a consistent roll hardness ensures that the squeeze pressure is evenly distributed, which prevents thick and thin spots in the starch coating of the yarn sheet.
Compliance Standard
The mill technician records these hardness values on the roll maintenance log before starting any new production run. The buyer check sheet requires that all roll hardnesses fall within a specified range, typically between sixty and seventy units. Divergences from this range lead to uneven sizing pickup and subsequent fabric quality issues.
Accurate calibration using the Shore a rubber durometer is mandatory for factories producing premium linen for export.