High-temperature And High-pressure Dyeing
High-temperature and high-pressure dyeing is a piece dyed method in which mainly synthetic fibers such as polyester are treated in a high-temperature, high-pressure dyeing machine so that the dye penetrates and fixes inside the fibers.
Contents6 sections
Definition and Overview
High-temperature and high-pressure dyeing is a dyeing method in which the dye liquor is kept at high temperature and high pressure inside a sealed dyeing machine. Dyeing means a method in which the entire fabric is immersed in dye liquor and dyed. It is mainly used for dyeing polyester with disperse dyes.
Because dye does not easily penetrate into polyester fibers at normal temperatures, high-temperature conditions temporarily relax the fiber structure and promote dye diffusion. After dyeing, cooling and washing are performed to remove excess dye.
Features
Fabric processed under suitable conditions tends to achieve bright, even coloration and is well suited to dark shades. Color tone, luster, and surface feel vary depending on the type of fiber, yarn cross-section and thickness, structure, pretreatment, dye, and finishing process.
Because heat, moisture, and tension are applied during dyeing, the width, length, thickness, and hand of the fabric may change. In particular, dimensional and surface control is important for lightweight fabrics, stretch knits, and fabrics combining different materials.
Main Applications
Polyester fabrics dyed by high-temperature and high-pressure dyeing are used for shirts, blouses, dresses, skirts, pants, jackets, linings, sportswear, and more. Applications are not determined by the dyeing method alone; they are judged together with the fabric structure, fabric weight, stretch properties, and finishing process.
Functions such as water absorbency and quick drying, antistatic performance, and water repellency are not properties provided by high-temperature and high-pressure dyeing itself. If such functions are required, confirm the aftertreatment details and wash durability in the fabric specifications.
How to Choose and Handling Precautions
When selecting fabric, check the blend ratio, dyeing method, color number, lot, width, shrinkage rate, and color fastness. Even with the same color number, differences in production lot or material composition may result in variations in color tone and hand. Color matching with trims and contrast fabrics should be confirmed with the actual item.
Before sewing, carry out water washing and trial sewing under the same conditions as mass production, and check shrinkage, twisting, and puckering after washing. For fabrics and auxiliary materials that are easily affected by heat, also pay attention to iron temperature and pressing conditions, and handle according to the care label.
Differences from Similar Terms
High-temperature and high-pressure dyeing is a term indicating a method that uses temperature and pressure during dyeing, and it is not a type of woven or knitted fabric or a material name. Polyester is the representative target material, but not all polyester fabrics are dyed by the same method.
Disperse dyes are dyes mainly used for hydrophobic fibers such as polyester. In contrast, reactive dyes are mainly used for cellulose fibers such as cotton and rayon. Also, piece dyeing refers to the process of dyeing after the fabric has been made, and high-temperature and high-pressure dyeing is one specific method of that process.
Frequently Asked Questions
Does fabric dyed by high-temperature and high-pressure dyeing shrink during washing?
The degree of shrinkage varies depending on the material, structure, knitting or weaving density, whether heat setting or finishing has been applied, and washing conditions. Shrinkage cannot be determined by high-temperature and high-pressure dyeing alone. It is necessary to carry out washing tests before productization and confirm the specified shrinkage rate and finished dimensions.
Do high-temperature and high-pressure dyeing and piece dyeing mean the same thing?
No, they do not mean the same thing. Piece dyeing refers broadly to the process of dyeing after the fabric has been woven or knitted. High-temperature and high-pressure dyeing is one of the methods used for piece dyeing, and is mainly used when dyeing polyester under high-temperature and high-pressure conditions.
Can high-temperature and high-pressure dyeing prevent color transfer?
Color transfer cannot be determined by the dyeing method alone. Washing off excess dye, the choice of dye, and finishing conditions affect wash fastness and rub fastness. For dark-colored items or combinations with light colors, it is important to confirm fastness testing appropriate to the intended application.
