1.What is the loss rate of cross-cutting (leveling)?
Theoretically, zero loss is possible. This is because steel coils are weighed, while cut steel plates are calculated based on theoretical weight. If the actual thickness of the steel plate has a negative tolerance, the yield rate can even exceed 100%.
2.What is the loss rate of longitudinal slitting (slitting)?
To achieve width accuracy, the edge threads of the master roll must be trimmed, and this loss is typically 4-8mm. If the equipment condition or operation is unstable, the loss may be even higher.
3.How does the matching degree between the master roll and the finished product dimensions affect the loss rate?
This is the most crucial factor. If the width of the master roll is exactly an integer multiple of the finished product you need, or if the leveling length just avoids the defective ends, the wastage will be very low. Conversely, if there is a lot of "leftover material," the wastage will naturally increase.
4.How does thickness tolerance affect loss rate?
As mentioned in the table, making good use of the negative tolerance of steel coils is a key point in controlling "theoretical loss," and can even allow the yield rate of the leveling process to exceed 100%.
5.What are some suggestions for practical application?
Optimize nesting: While meeting usage requirements, optimize nesting to improve the utilization rate of the master roll, thereby reducing the theoretical waste per unit.
Clarify tolerance requirements: During procurement and processing, discuss the possibility of utilizing negative tolerances with suppliers; this is a common cost control practice in the industry.
Pay attention to edge trimming allowance: During slitting, confirm a reasonable edge trimming allowance with the processor to avoid unnecessary waste.