Calculating Vessel Payload Capacity from Master Greige Roll Weights
Calculate vessel payload capacity by adjusting greige roll weights for sizing loss, finish pick-up, moisture regain, and core tare volume constraints.
Stenter Frame Shrinkage
Dimensional Alteration
A dimensional alteration refers to the reduction in fabric width or length that occurs during the heat-setting process on a finishing machine. Monitoring stenter frame shrinkage allows the mill to predict the final yield of the fabric after it has been washed or steamed. This value is measured by comparing the dimensions of the fabric as it enters and exits the heating chamber.
Heat Stabilization
Tenter hooks hold the fabric at a specific width while high temperatures lock the synthetic fibres into their new configuration. Because stenter frame shrinkage is controlled by the speed of the overfeed rollers, the technician can adjust the tension to meet the customer specification.
Fibre Reaction
Natural and synthetic fibres respond differently to the dry heat or steam applied within the machine. Excess stenter frame shrinkage can lead to a fabric that is too narrow for the garment patterns, while insufficient shrinkage might result in a garment that deforms after the first home laundering. The dwell time inside the frame must be sufficient for the core of the yarn to reach the glass transition temperature.
Once the fabric cools, the new dimensions remain relatively stable unless subjected to higher temperatures later. Consistent monitoring prevents the over-processing of delicate materials that may become brittle under extreme heat.
Mechanical Limit
Some elasticated fabrics reach a point where no further heat setting can prevent subsequent movement. Stenter frame shrinkage cannot compensate for poor tension control during the earlier knitting or weaving stages.