Calculating Electronic Card Setup Fees and Loom Hour Output Surcharges
Electronic card fees cover digital hook mapping while loom hour output surcharges adjust metre costs for reduced insertion speed and lower shed efficiency.
Beam Change Downtime
Production Interval
Production intervals represent the total non-productive hours required to remove an empty warp cylinder and install a full one on a weaving machine. When beam change downtime occurs, the loom remains idle. This period includes the physical transport of heavy beams and the precise alignment of the warp sheet.
Mechanical Adjustment
Mechanical adjustments involve the calibration of let-off motions and tension controls to match the specific properties of the new linen warp. Technicians must verify that the beam is centered and that the flange width matches the loom specifications. Because linen yarn lacks the elasticity of cotton, the beam change downtime period often includes careful manual threading of the dropper bars and reed.
Any misalignment at this stage causes immediate warp breakage upon restart. Standardizing such movements reduces variability between shifts. Large Chinese linen mills often employ dedicated knotting teams who operate independently of the weavers to ensure the beam change downtime remains within the planned maintenance window.
Efficiency Impact
Efficiency impacts are measured by comparing the frequency of beam replacements against the total meters of fabric produced per shift. High-density fabrics require more frequent changes because the increased yarn thickness reduces the total length wound onto a standard beam. Mills minimize beam change downtime by utilizing automatic knotting machines or preparing spare harnesses away from the loom.