Edge Finishing
Edge finishing is a general term for sewing and processing done to prevent the cut edges of textile or the edges of seam allowances from fraying or stretching, and to improve appearance and durability.
Contents5 sections
Definition and Overview
Edge finishing is a treatment applied to fabric edges created by cutting, or to the edges of seam allowances after pieces are sewn together. Its purpose is not only to prevent fraying, but also to improve touch against the skin, thickness, stability after washing, and the appearance of the inside of the product.
Edge finishing is used in almost the same sense as edge treatment. On the other hand, seam allowance finishing often refers mainly to treating the edge of a seam allowance on the inside of a product, and is a narrower term than edge finishing, which also includes finishing visible edges such as hems and necklines.
Position in Product Development
The method of edge finishing is decided at the planning and design stage based on the fabric structure, thickness, tendency to fray, stretchability, washing method, and desired appearance. It is important to clearly specify the treatment method and target areas in the specification sheet, pattern, and sewing instructions, and share them with the sewing factory.
In the process, it may be done after cutting, or on the seam allowances after parts are sewn together. The appropriate sequence also changes depending on how the seam allowance is pressed open or to one side, and whether there is stitching in later processes, so this should be considered together with process design.
- Method of overlocking the seam allowance edge
- Method of folding the edge into a narrow three-fold hem and securing it with stitching
- Method of securing the edge with houndstooth stitching
- Method of intentionally leaving the cut edge visible and controlling fraying through the characteristics of the fabric
Approach and Practical Points
In prototyping, check whether the specified edge finishing is suitable for the fabric. For lightweight fabrics, be careful of seam shrinkage and waviness; for heavyweight fabrics, step-like thickness caused by overlapping seam allowances; and for knits, stretching and seam breakage. The finish changes depending on the combination of fabric, thread, needle, and sewing machine conditions.
For edge finishing visible on the outside, check the stitch width, distance from the edge, how corners are finished, and thread color. For seam allowance finishing, focus on the coverage of the overlock thread, any remaining fraying at the edge, twisting of the seam allowance, and left-right differences. Evaluate samples with washing and wear in mind.
Ordering and Quality Notes
When placing an order, "edge finishing included" alone does not identify the method. Specify the target area, treatment method, seam allowance width, fold width, stitch type and thread color, front and back, and finishing direction in the specification sheet or instruction drawing. For areas where appearance is important, agree on the standard using an approved sample.
For quality inspection, check for fraying at the edge, thread breakage, seam slippage, puckering, waviness, seam allowance catching, and left-right differences. Even for cut-edge specifications, confirm in advance whether changes at the edge due to washing or friction are within an acceptable range, and make it clear that the design is intentional.
Frequently Asked Questions
Are edge finishing and overlocking the same?
No. Edge finishing refers broadly to all treatments that neaten fabric edges and seam allowance edges, and overlocking is one representative method. Three-fold hems, houndstooth stitching, and piping are also used for edge finishing depending on the application and specifications.
Is edge finishing unnecessary for fabrics that do not fray easily?
For fabrics that do not fray easily even when left cut, it may be possible to omit edge finishing. However, changes at the edge caused by washing, friction, and the number of times worn, as well as the touch against the skin and appearance, differ by fabric. Decide after prototyping and washing tests.
How much detail should be included in the specification sheet for edge finishing?
In addition to the target area and treatment method, specify the seam allowance width, fold width, stitch position, thread color, and whether the finished seam allowance should be pressed open or to one side. For areas that affect the visible appearance, sharing instruction drawings and approved samples with the factory helps prevent misunderstandings.
