HTHP Horizontal Single Vessel Yarn Dyeing Machine

What is an HTHP Horizontal Single Vessel Yarn Dyeing Machine

• It's a type of dyeing equipment used for dyeing yarn packages, hanks, cones etc., under high temperature (often up to ~140 C) and elevated pressure.

• Horizontal single vessel means the dyeing chamber is one vessel laid out horizontally (or with tubes), not vertical, and all dyeing happens in that vessel.

• Used especially for synthetic fibers like polyester, nylon, also cotton, silk, wool etc.

• Key aims include uniform dyeing, low liquor ratio (MLR), energy/water/chemical savings, better process control.

Core Operating Principles

1. Liquor Circulation: Dye liquor is circulated through/around yarn packages or carriers, often in a reversible manner (intoout & outtoin) to ensure even penetration of dye.

2. High Temperature & Pressure: To facilitate dye uptake, especially for synthetics, dyeing is done at elevated temperatures (up to approx. 140C) and pressure (several bars, e.g. ~46 kg/cm). This ensures faster kinetics, better fixation of dyes.

3. Low Liquor Ratio: Because dye liquor is expensive (chemicals, water, energy), these machines are designed for low liquor ratio (sometimes as low as 1:5 up to 1:7 etc.) meaning less water/volume of dye solution per weight of yarn.

4. Heat Management: Heating is typically via steam, sometimes indirect heating (heat exchangers), and cooling is with water. Good machines include efficient heat exchangers to reduce heat losses.

5. Safety and Automation: Lid locking mechanisms (often pneumatic), safety interlocks for temperature, pressure, level, etc. Many machines have PLC or microprocessor control, touchscreen panels, sampling ports.

6. Variable Loading / Dummies / Carriers: To manage yarn density inside packages, to adjust for different batch sizes and maintain uniformity, many machines use dummy carriers or variable loading to optimize the liquor ratio and flow.

Typical Features (from manufacturers in India, for Horizontal / Tubular HTHP Yarn Dyeing Machines)

Below are features commonly offered, based on Indian machines: