Roll-by-roll Cutting
Roll-by-roll cutting is a management method that, in principle, cuts the same product or the same combination of parts from one roll of fabric, helping prevent color and hand-feel differences between rolls from being mixed within a product.
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Definition and Overview
Roll-by-roll cutting is the idea of cutting the required parts within the range of fabric wound as one roll. Because dyeing and finishing conditions can vary slightly from roll to roll, the front body, back body, sleeves, and other parts of the same product are not taken from different rolls.
It is mainly used at the stages of fabric ordering, production instructions, spreading, and cutting. In some cases, the fabric supplier requests roll-by-roll allocation as a precaution, and the purchaser plans not only the required yardage but also quantities that allow the product to be completed within each roll.
Why It Is Necessary
Even with fabric of the same product number and color name, differences in processing lot, greige fabric, dye, finishing, and other factors can cause slight variations in hue, shade, luster, and hand feel when the roll changes. If the difference is visible between adjacent parts, it affects the product's appearance.
In products that undergo washing processes such as denim, even with roll-by-roll cutting, the degree of fading and fading marks caused by washing may differ from part to part. Roll-by-roll cutting is not a way to eliminate post-processing differences; it is a basic management method for reducing the effects of differences between rolls.
Checks Required at Ordering and Cutting
Simply dividing the required number of garments by the effective length of one roll does not determine whether roll-by-roll cutting is possible. In addition to the yardage required by size, fabric direction, grain, pattern matching, and cutting loss, the fabric defects identified during inspection are taken into account to calculate how many garments can be cut from each roll.
When placing an order, share with the fabric supplier or sewing factory that cutting must be done by roll, the areas where color differences cannot be tolerated, and the required number of garments and size breakdown. Confirming the actual roll length, effective width, whether the roll can be split, and how leftover fabric will be handled in advance also helps reduce misunderstandings.
- Indicated roll length and the effective length actually usable for cutting
- Fabric width and usable width including selvage
- Defect locations such as damage, stains, and uneven color, and the deduction length
- Required yardage based on pattern direction, nap, grain, and pattern matching
- Remaining fabric by roll and combinations by size
Differences from Similar Terms
Roll-by-roll cutting, one-roll cutting, roll allocation cutting, and one-roll allocation are used almost interchangeably in practice. In general, they all mean not taking parts of the same product across multiple rolls.
Lot management is the practice of handling fabric produced under the same period or conditions together, and it applies to multiple rolls. Roll-by-roll cutting is different in that it considers differences between rolls even within the same lot and manages cutting on a per-roll basis. Random-length rolls refer to a state in which roll lengths are not uniform, and this is not the same as roll-by-roll cutting itself.
Frequently Asked Questions
Is roll-by-roll cutting always necessary?
It may be required for solid-colored items where roll differences are noticeable, fabric with a surface effect, or specifications in which parts appear continuous within the same product. On the other hand, the necessity depends on fabric characteristics, product specifications, and acceptable quality levels, so confirm the supplier's notes and production standards.
What if one roll cannot provide the required number of garments?
One option is to adjust production quantity or size allocation so that it can be completed within each roll. If adjustment is difficult, discuss in advance with the fabric supplier and sewing factory whether the material can be used in less noticeable other parts, how to confirm roll differences, and how to handle leftover fabric, and record this in the cutting instruction sheet.
Can we cut across rolls if they are from the same lot?
Even within the same lot, differences in color and hand feel between rolls may not be completely eliminated. Therefore, if the fabric supplier instructs roll allocation, plan on the premise that cutting will be done within a single roll. If crossing rolls is unavoidable, lay the actual materials side by side and check for differences before deciding whether to use them.
