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Differences Between HTHP&NTNP Machine

Differences Between HTHP&NTNP Machine

2025-08-11

Differences Between High-Temperature High-Pressure Dyeing Machines and Normal-Temperature Atmospheric-Pressure Dyeing Machines

1. Different Working Conditions


High-temperature high-pressure dyeing machines:
The working temperature is usually above 100℃ (commonly 120-130℃, or even higher), and the working pressure is higher than atmospheric pressure (generally 0.2-0.5MPa, depending on specific temperature requirements). A sealed design is required to maintain the high-temperature and high-pressure environment.


Normal-temperature atmospheric-pressure dyeing machines:
The working temperature is usually from room temperature to 100℃ (mostly the boiling temperature, i.e., 100℃), and the pressure is atmospheric pressure (1 standard atmosphere). There is no need for a sealed and pressure-resistant design; even an open or simply sealed structure can be adopted.


2. Different Applicable Fibers and Dyes


High-temperature high-pressure dyeing machines:
They are mainly used for synthetic fibers (such as polyester, nylon, acrylic, etc.). These fibers have a dense structure and strong hydrophobicity, making it difficult for dyes to penetrate at normal temperature. High temperatures (around 130℃) are needed to intensify the movement of fiber molecular chains and increase the gaps, and they are used in conjunction with disperse dyes (special for polyester), acid dyes (special for nylon), etc., to achieve dyeing.


Normal-temperature atmospheric-pressure dyeing machines:
They are suitable for natural fibers (cotton,flax,wool, silk, etc.) and some regenerated fibers (such as viscose). Natural fibers have strong hydrophilicity. At normal temperature or boiling (100℃), reactive dyes (for cotton,flax), acid dyes (for wool/silk), etc., can complete dyeing through penetration, reaction, or adsorption without the need for high temperature and high pressure.