Flat Cord

Definition and Overview

Flat cord is a cord finished in a flat, tape-like shape, unlike round cord with a round cross section. In addition to functions such as tying, threading, and tightening, it can also serve as a design accent by making use of its visible width. In apparel, it is a secondary material often used as a drawcord for the waist or hood.

“Flat tape” is sometimes treated as another name for flat cord. However, flat tape generally can also refer to all kinds of narrow tapes, so distinguish between tape mainly used for sewing and flat cord used for threading or tying by checking the application and specifications.

Materials and Structure

Materials include cotton, polyester, nylon, and others. Cotton tends to give a natural texture, while synthetic fibers are suitable for applications that consider relatively light weight and durability. Depending on the material, thread thickness, density, and finish, stiffness, slipperiness, luster, and dimensional change after washing will differ.

Structures include those made as narrow woven fabric, those made as knitted fabric, and those made by braiding threads into a flat finish. Woven flat cord tends to hold its shape well, while knitted and braided flat cord changes in softness and elasticity depending on the structure.

• Woven: shape is likely to remain stable, and the appearance is relatively firm.
• Knitted: soft, and depending on the structure, may feel stretchy.
• Braided: thickness, flexibility, and surface feel can be adjusted by the way the threads are braided.

How to Read Width and Dimensions

Flat cord is generally specified by width in millimeters. Because of its flat shape, it is difficult to judge by diameter alone as with round cord, so in addition to width, it is important to check thickness, stiffness, and cross-sectional shape. Even with the same width, thickness and density change how easily it passes through holes such as eyelet washers and the size of the knot.

In specifications, state the finished width, required length, end treatment, and combination with the holes or cord stoppers it will pass through. For applications that gather fabric, confirm the slipperiness when pulled and the required strength through prototypes as well.

Main Applications

In apparel, it is used for hoodie and blouson hoods, pants and skirt waists, and waist marking on dresses. Because the flat surface is visible, it is also suitable for decorative uses such as color accents or showing printed or woven patterns.

In bags and pouches, it is used for drawstrings to close openings, handles, and details that show knots. Depending on the application, consider the load during pulling, how it feels against the hand, and friction with hardware or holes.

Selection and Handling Notes

When selecting, check the width, thickness, strength, and texture required for the application, as well as stretch and shrinkage. Flat cord that stretches easily may change the cinching position at the waist or hood. When washing or product washing will be performed, check in advance the color difference from the main textile, shrinkage difference, and whether color transfer occurs.

The cut ends may fray depending on the structure of the woven, knitted, or braided cord. Choose a finishing method suitable for the material and specifications, such as folding the end and sewing it down, covering it with a cord end, or heat treatment. Because heat treatment may cause melting or discoloration depending on the material, a prior test is always necessary.

• Check that the inner size of the threading opening matches the width and thickness of the flat cord.
• When using a cord stopper, confirm retention and ease of passage with the actual item.
• For applications that form knots, check slipperiness and resistance to coming undone.
• Check shrinkage, color fading, and fraying after washing according to product conditions.

Frequently Asked Questions

How should flat cord and round cord be used differently?

Flat cord is suited to waist cords, hood cords, and designs that show knots, making use of its wider appearance. Round cord passes through holes more easily and gives a more three-dimensional, cord-like impression. Choose based on the dimensions of the threading opening, required strength, ease of tying, and the overall design of the product.

How should the width of flat cord be chosen?

First, check the width and thickness that will pass smoothly through the inner size of the threading opening, eyelet washer, cord stopper, and so on. Next, consider the load during pulling, the size of the knot, and the presence you want to show. It is important to confirm not only the specified width, but also the ease of threading due to thickness and stiffness through prototypes.

What should be done if the end of flat cord frays?

Methods include sewing the end in, folding it over to finish it, or attaching a cord end. Heat treatment may be possible for synthetic fibers, but depending on the material and processing, melting, hardening, or discoloration may occur. Before mass production, confirm the finish and durability with the actual flat cord.