Basis weight, CD varying
Carefully check headbox variables and slice setup. 1. Eliminate headbox shower water pressure pulsations that can disturb both MD and CD profiles. 2. Adjust headbox variables to obtain optimum flow pattern. 3. Check condition of slice screws and adjust slice. 4. Check for a warped slice or a dirty slice lip. 5. Check for poor […]
Consistency varying
1. Mills should have double stock regulation so that consistency changes do not affect the quality of the stock fed to machine. — the proportions of stocks should not vary if the consistency to the proportioning system is constant for each stock component. 2. Where consistency to regulators varies by such an amount that the […]
Basis weight (CD) variations
1. An off-machine basis weight profiler is the minimum tool that should be considered today. (a) use profiler with composite and superimposed profiles. — determine stability of variations shown as this indicates degree of correction that may be achieved. (b) adjust the slice. — always adjust using manufacturer’s restrictions on deviations between screws to avoid […]