Machine Cleaning Agents
A machine cleaning agent is not applied to fabric; it is applied to the machine. Dye residue and oligomer that build up on vessel walls, heat exchangers, pipework and pump housings come back as spots and shade deviation on the next lot.
Why does the machine get dirty?
Dyeing runs in a closed circuit, so everything in the liquor touches the machine surfaces. Three kinds of residue collect there over time.
The first is dye residue. After dark navy, black and red shades in particular, a thin film stays on the vessel wall; that film redissolves during the next pale shade and transfers onto the cloth.
The second is polyester oligomer. Low molecular weight polyester fragments migrate out of the fibre at HT temperature, lose solubility as the bath cools, and settle on the first cold surface they meet. That is why heat exchangers and filter housings block first.
The third is scale and precipitated auxiliaries. In hard water, calcium salts, silicone residue and broken emulsions all gather on the same surfaces.
When is a boil-out run?
Three situations call for one:
- Shade change. Going dark to pale without a clean, the first pale lot goes off shade. This is planned work, not a reaction to a problem.
- Scheduled maintenance. Oligomer builds gradually, so the clean is run to programme before machine performance drops.
- After a fault. When spots appear on fabric with no obvious cause, the vessel surfaces are among the first places to look.
Frequency depends on machine type and the shade range being run: pending from the client.
How is it applied?
The clean runs on an empty machine with no fabric loaded. The agent is dosed, the temperature raised, circulation held for a set time, then the bath is rinsed out. Recipes that run with alkali dissolve oligomer more readily; the alkali level is set against whatever limit the machine builder gives for the stainless surfaces.
If rinsing is cut short, the agent left behind foams in the next dyeing and disturbs levelness. At least one full rinse follows the clean. Product-specific recommendations are on the product pages: pending from the client.
Can an ordinary washing agent do this job?
It can, but not efficiently. Fabric washing agents are formulated to stop released soil re-depositing on cloth, and in a boil-out there is no cloth. What you need is to lift a bonded film off a hard surface and hold it in suspension until it is drained away. Machine cleaning agents are tuned for that second job.
Product comparison
Comparison
| Product | Description | Dosage | Temperature | Time | Use with alkali |
|---|---|---|---|---|---|
| DK M WASH | Machine cleaning agent | awaiting data | awaiting data | awaiting data | awaiting data |
| DK M WASH CT | Concentrated machine cleaning agent | awaiting data | awaiting data | awaiting data | awaiting data |
Products
- DK M WASH
Machine cleaning agent that strips the dye and oligomer built up on vessel walls, pipework and heat exchangers.
- DK M WASH CT
Concentrated machine cleaning agent that keeps the boil-out short and economical between dark and pale shades.
Common questions
Is a boil-out needed at every shade change?
No. Going from pale to dark, a rinse is usually enough. It is the dark to pale direction, especially after black and navy, that calls for a clean.
How do you spot oligomer build-up?
The first sign is the filter needing cleaning more often. White powdery specks on the fabric and falling heat exchanger efficiency point the same way.
What does the concentrated grade change?
It delivers the same clean at a lower dosage, so shipped and stored volume falls. The conversion is given on the product page: pending from the client.
Other families in this category
Related applications
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Not finding what you need?
We develop custom formulations. Tell us your process, machine type and the result you are after, and the lab will set up a trial and send a sample.