When Do You Need an HTHP Dyeing Machine?
Polyester and many other synthetics only fix disperse dyes above 100 degC, which a sealed, pressurized machine is required to reach. An HTHP overflow dyeing machine moves rope fabric through an overflow-jet nozzle inside a pressure vessel at up to 145 degC and 0.4 MPa.
It is especially suited to high value-added new synthetic fibers and microfiber, and can also carry out scouring, bleaching, preshrinking and alkali reduction. Where a jigger dyes open-width fabric gently, an overflow jet dyeing machine runs fabric in rope form at high speed for larger lots.
If your target is polyester, nylon, polyester-cotton blends, elastic yarns or microfiber in the 50-800 g/m range, this is the HTHP dyeing machine that does the job - and the low liquor-ratio design keeps water, steam and chemical use under control.
Core Parameters & Technical Data
Type: horizontal, designed for high-temperature high-pressure dyeing of open-width woven fabrics in rope form.
Liquor ratio: 1:6-12 - a low liquor-ratio dyeing machine that saves water, steam and dyestuff per batch.
Fabric capacity: up to 250 kg per tube, varying with process and fabric.
Max working pressure: 0.4 MPa; max working temperature: 145 degC.
Fabric speed: up to 600 m/min, for productive rope dyeing.
Nozzle: overflow jet with adjustable gap, available in sizes 60, 75 and 90 mm to match fabric weight.
Main materials: 1Cr18Ni9Ti, 321 or 316L stainless steel.
Control: manual or program control.
Suitable fabrics: polyester, nylon, polyester-cotton blends, microfiber, composite fibers, elastic yarns, new synthetic fibers and various blends, 50-800 g/m.
How to Choose an HTHP Overflow Dyeing Machine
Anchor the choice on the substrate. Polyester, nylon and microfiber need the 145 degC, 0.4 MPa pressure range; cotton-led goods that do not need heat can use an atmospheric machine instead.
Match the nozzle to fabric weight. The 60, 75 and 90 mm overflow-jet nozzles with adjustable gap suit different weights - too tight a nozzle stresses delicate rope fabric, too loose loses jet action.
Compare liquor ratio. The 1:6-12 ratio lowers water, steam and chemical consumption versus older, higher-ratio machines - a direct operating-cost saving.
Decide tube count and capacity against your lot size. Up to 250 kg per tube, so count tubes for your target batch and leave room for growth.
Choose the material grade for your chemistry. 316L stainless steel gives extra corrosion resistance for aggressive dyeing conditions.
Weigh open-width jigger versus rope overflow. Jiggers are gentler on woven face goods; overflow jet dyeing is faster and suits synthetics and microfiber. Pick by fabric, not by habit.
Common Mistakes Buyers Make
Trying to dye polyester on an atmospheric machine. Below 100 degC disperse dyes do not fix, giving weak, fugitive shades. Specify an HTHP machine for synthetics.
Mismatching nozzle size to fabric weight. A nozzle that is too tight on light, delicate rope fabric causes ropes and creasing; too large loses the jet action that levels the shade.
Ignoring liquor ratio. An older, high-ratio machine dyes acceptably but burns water, steam and chemicals every batch - the 1:6-12 ratio is a real cost difference.
Under-rating material grade. For aggressive dyeing conditions, non-316L construction can corrode and stain fabric over time.
Buying without commissioning support. HTHP pressure vessels need correct installation, sealing and operator training - a direct production factory makes the difference.
Why Buy from Wuxi Runda
We are a production factory founded in 2004, located in Qianzhou, Wuxi - inside Jiangsu's dyeing machinery industrial cluster, close to component supply and an experienced skilled workforce.
We cooperate with textile research institutes and technical colleges year-round on dyeing and finishing equipment and processes, and design and develop our own series.
Our HTHP dyeing machine is built for small batches, multiple varieties and low energy consumption, with reliable, stable performance for synthetic and microfiber dyehouses.
Our equipment is exported to Vietnam, India, Bangladesh, Indonesia, Pakistan, Japan, Thailand and other Southeast Asian markets, with complete after-sales service including installation, commissioning, spare parts and operator training.
Frequently Asked Questions
What is the difference between a jigger and an overflow dyeing machine?
A jigger dyes open-width fabric gently on rollers through a small bath; an overflow jet dyeing machine moves rope-form fabric through a nozzle at high speed under pressure. Jiggers suit open-width woven face goods; overflow jet dyeing suits synthetics, microfiber and larger lots.
What temperature and pressure does the HTHP dyeing machine reach?
Max working temperature is 145 degC and max working pressure is 0.4 MPa, which is the range required for disperse dyeing of polyester and other synthetic fabrics.
What is the liquor ratio and fabric capacity?
The machine runs at a liquor ratio of 1:6-12, with fabric capacity up to 250 kg per tube, varying with the process and the fabric. A lower liquor ratio saves water, steam and chemicals per batch.
Which fabrics can it dye?
Polyester, nylon, polyester-cotton blends, microfiber, composite fibers, elastic yarns, new synthetic fibers and various blends from 50-800 g/m. It can also be used for scouring, bleaching, preshrinking and alkali reduction.
What nozzle sizes and materials are available?
The overflow-jet nozzle has an adjustable gap and comes in 60, 75 and 90 mm sizes to match fabric weight. Main materials are 1Cr18Ni9Ti, 321 or 316L stainless steel, with manual or program control.
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