Downproof
Downproof is a high-density woven textile or its performance, used in products that use down or feathers as the filling to prevent feathers from escaping through the outer fabric or lining.
Contents6 sections
Definition and Overview
Downproof is a property that helps prevent the tips and fine barbs of feathers from coming out through gaps in the textile. In general, it is achieved by weaving fine yarns densely and tightening the weave to reduce the paths through which feathers can pass. It is not a specific fiber name or weave structure.
In down jackets and similar items, it is required not only for the outer fabric but also for the inner textile that directly holds the down. Feather leakage is affected not only by the performance of the textile itself, but also by the type of down filling, the seams, and friction during use.
Features
Downproof textiles woven at high density tend to have a relatively smooth surface and a feel of firmness and body. On the other hand, even with the same material, thickness, lightness, suppleness, and luster can vary depending on yarn thickness, density, and finishing.
Because they are often designed to reduce breathability, the tendency for stuffiness inside the garment should be checked based on the overall textile specifications. Some are given water-repellent finishing, but downproof refers to a property related to preventing feather leakage and is not a term for water repellency or waterproofness.
Main Applications
They are mainly used for autumn and winter down jackets, down coats, vests, and lightweight cold-weather wear. Depending on the product design, they are used in the outer fabric, lining, inner bags for down packs, and other areas. For outdoor use, a balance with light weight and durability is also considered.
They are also applied to bedding and miscellaneous goods that use down, but the required performance varies by application. In apparel, friction and bending during wear, and in bedding, long-term compression, should be assumed, and feather leakage should be checked under conditions close to the finished product.
Selection and Handling Notes
When selecting, in addition to material, fabric weight, density, breathability, and hand feel, feather leakage should be checked with a trial sample using the actual down to be filled. Even with high density, feathers may come out through seams or needle holes depending on the down, including thicker quills, and on sewing conditions.
For sewing, adjust the needle size, sewing thread, stitch length, and sewing speed to suit the textile so that excessive needle holes are not made. Puckering and broken ground yarns can also cause feather leakage, so a test seam should be made before sewing.
Shrinkage from washing or drying, changes in finish feel, and shifting of the down vary by specification. Check the washing label and shrinkage rate of the textile, and if product washing will be performed, determine mass-production conditions only after evaluating the dimensions, appearance, and feather leakage after washing.
- If water repellency is required, check the presence and durability of water-repellent finishing separately from downproof performance.
- Select the sewing needle and sewing thread based not only on the textile sample but also on the state with the filling inserted.
- Unroll the fabric before cutting and perform straightening if necessary, then prepare patterns that reflect the shrinkage rate.
Differences from Similar Terms
Down, in general, may refer to a high-density plain weave textile and may be used for downproof applications. However, the weave or textile name down and the performance of preventing feather leakage, downproof, are not necessarily the same. Individual specifications must be checked.
Typewriter cloth is also known as a high-density textile with firmness and body, but not all of it has downproof performance. In addition, calender finishing and ciré finish are processes that press the surface to tighten the weave and may help downproof performance, but the finishing name itself does not guarantee performance.
Frequently Asked Questions
Does downproof textile completely prevent feathers from leaking?
It is a textile intended to reduce feather leakage, but it does not mean that leakage is completely impossible. It is affected by feather quills, holes made by sewing needles, the condition of seams, friction during wear, and other factors. Before mass production, it is important to evaluate the finished product using the actual filling and sewing specifications.
Are downproof and water-repellent finishing the same?
No, they are not the same. Downproof is a property that makes feathers less likely to pass through the textile, while water-repellent finishing is a surface treatment that makes water droplets easier to repel. For outerwear that must handle rain or snow, feather leakage prevention, water repellency, and, when needed, waterproof breathability should be considered separately.
What should be noted when sewing downproof textile?
Because needle holes and broken ground yarns can lead to feather leakage, choose a needle size and sewing thread suitable for the textile and check with a test seam. Making the stitches too fine can also increase needle holes, so adjust while considering strength and appearance. Sewing tests with the filling inserted are also effective.
