Spiral Boning
Spiral boning is an auxiliary material made by forming spirally wound steel wire into a flat strip and inserting it inside a garment to provide support and retain shape while following the body.
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Definition and Overview
Spiral boning is boning made by spirally winding multiple steel wires. It bends relatively easily across the width, and is less likely to stretch or shrink along the length, so it can support the shape of a garment while following the body’s curves.
Boning is a general term for reinforcing materials used in corsets and similar items. Spiral boning is one type of boning, and “boning core” is a broader term. Plastic boning is a separate resin-based material and does not necessarily refer to the same thing.
Placement and Function
It is mainly inserted vertically into the bodice to shape lines such as the bust, waist, side, and center back areas. It helps maintain a raised silhouette that fabric alone cannot easily support, and helps prevent wrinkles, riding up, and curling during wear.
For curved side seams and princess lines, it is a material that can take advantage of its ability to follow the body. On the other hand, where strong straightness or rigid support is needed, a different type of flat, hard boning may be chosen.
- Bodices for bustiers and corsets
- Bridal dresses, stage costumes, formal dresses
- Torso sections of lingerie and garments with shaping support
Materials and Types
Common spiral boning is made of steel, and the surface may be treated for rust prevention. Because the ends can easily damage the fabric, some products come with caps attached in advance, while others require end treatment after cutting.
Boning includes, in addition to spiral steel products, flat steel boning, resin-based plastic boning, and boning tape for sewing in. These are distinguished according to the required support, direction of bending, washing method, and product thickness.
How to Choose and Sewing Precautions
When selecting, confirm the length, width, thickness, bending characteristics, and required holding force of the area where it will be inserted. Make the boning long enough not to interfere with seam allowances or the finishing at the top and bottom ends, and leave extra room above and below so the ends do not touch the skin or outer fabric when worn.
In many cases, boning is inserted into a boning channel or tape. If you sew directly through the boning itself with a needle, it can cause needle breakage or damage, so sew the channel leaving an opening for insertion, then insert the boning at the end and secure the ends firmly.
For steel products, check for possible discoloration or rust caused by washing, sweat, or moisture. For items that will be water-washed, confirm the accessory material specifications and washing test requirements in advance, and if necessary consider a removable design or an alternative material suitable for washing.
Differences from Similar Terms
A bra wire is an arched metal component that supports the lower part of a bra cup. Spiral boning, by contrast, is used vertically in the bodice and serves to shape the torso. Their applications and shapes are different.
Plastic boning is resin boning with light weight and ease of processing. Even products called spiral boning may differ in material and structure, so when placing an order, confirm whether it is steel or resin, as well as the width, thickness, and end specifications.
Frequently Asked Questions
Are spiral boning and plastic boning the same?
No, they are not the same. Spiral boning generally refers to boning made of spirally wound steel wire, while plastic boning is made of resin. However, in sales settings they may be handled under the broader term boning core, so it is important to confirm the material and structure.
Can spiral boning be machine washed at home?
It depends on the product material, end treatment, and the combination with the surrounding fabric. In the case of steel products, consider rust and discoloration caused by moisture, and confirm the specifications in line with the care label. Before mass production, it is reassuring to perform a washing test on the finished product.
Can boning be sewn directly with a sewing machine?
As a rule, do not sew through the boning itself with the sewing machine needle. Because this can lead to needle breakage or deformation of the boning, the usual method is to sew the boning channel first, insert the boning through the opening, and then secure the ends.
