Bleach Processing
Bleach processing is a process that uses chemicals or similar means to partially or completely remove dye color from textile or products, creating a light color tone or a faded appearance.
Contents6 sections
Definition and Overview
Bleach processing is a finishing process that removes color from dyed textile or products after sewing, creating a light tone or a worn-in appearance. Unlike dyeing, which adds color, it acts on the existing dye to change the color.
How the color is removed varies depending on the original dye, the type of fiber, and the processing conditions. It does not always become the intended white, and yellowish or reddish tones may remain, so the finish is confirmed through prior testing.
Features and Appearance
When applied to dark materials, it creates faded light-and-dark effects and a casual look. In addition to making the overall tone lighter, there are also methods that leave irregularity and use differences from piece to piece as part of the design.
Because the fiber surface and dye change through processing, the handfeel may seem softer. On the other hand, depending on the processing conditions and material, strength reduction, fuzzing, and uneven color may occur, and it is not a process that adds functionality.
Main Applications
It is used for casual clothing such as denim pants, jackets, shirts, T-shirts, and sweatshirts, where aging effects and a vintage feel are incorporated into the design. It is relatively easy to create a light impression and is used from spring and summer items to year-round items.
It may be applied at the textile stage or after sewing on the finished product. In product processing, the way the color fades changes at seams, overlapping parts, and folded sections, which is a feature that tends to create a more three-dimensional appearance.
Selection and Handling Notes
Because the finish and durability vary depending on the material, dyeing method, and color before processing, color, handfeel, and shrinkage are checked using samples close to the same conditions as full production. In product processing, accessories and sewing thread are also affected by the processing liquid, so selection is made with chemical resistance and color difference in mind.
With repeated washing, the color may change further. It is necessary to manage the item according to its washing label, such as washing separately, turning it inside out, and avoiding long soaking. Before cutting, fabric is straightened, and the pattern is designed while allowing for dimensional changes after processing.
In sewing, the acceptable range is shared using a sample so that uneven color is not mistaken for a defect. Because the appearance may also change at the edges of the textile and inside and outside seam allowances, sewing tests are carried out including stitch color, seam finishing, and whether fusible interlining is used.
Differences from Similar Terms
Discharge printing usually refers to a technique that removes color from part of a dyed textile to create a pattern, and it is used in combination with the printing process. Bleach processing is a broader term for lightening the entire item or intended areas to create color tone or a used look.
Stone washing and bio processing use friction or enzymes to create fading, color loss, and softness. They are sometimes used together with bleach processing, but they differ in that the main method is to decolorize with chemicals.
Frequently Asked Questions
Does bleach processing cause textile shrinkage?
Whether shrinkage occurs and to what extent depends on the type of fiber, the textile structure, pre-treatment, and the processing conditions. In particular, product processing also involves washing and drying steps, so it is important to check the shrinkage after processing before reflecting it in pattern dimensions and fabric consumption.
Is bleach processing the same as used processing?
No, they do not mean the same thing. Used processing is a general term for finishing that creates the appearance of being worn and washed repeatedly. Bleach processing is one decolorizing method used for that expression, and it may be combined with washing, friction processing, and damage processing.
Do bleach-processed items transfer color?
Even if thorough washing and neutralization are performed after processing, products with dark sections remaining may transfer color through friction or washing. Take care when pairing them with light-colored clothing, bags, or furniture, and check washing fastness and rubbing fastness according to the intended use.
