Washing Agents
Greige fabric does not reach the dyehouse clean. It carries spin finish, machine oil, size residue and handling soil. Washing agents emulsify those residues into the bath so the dye can meet the fibre evenly.
What does a washing agent remove?
On knitted goods the load is mostly spin finish and machine oil; on wovens it is size residue and weaving oil. Handling soil, dust and finger marks sit on top of that. What they share is that water repels them, so hot water alone will not lift them off the surface.
A washing agent runs three mechanisms at once. It lowers surface tension so water reaches the soil, it takes oil into micelles, and it then keeps the released soil in the bath instead of letting it settle back on the cloth.
Before dyeing or after?
Both, for different reasons.
A pre-dye wash belongs to pre-treatment. It runs alongside bleaching and desizing, and its aim is even absorbency across the piece. Skip it and the oily areas take less dye, which shows up as unlevelness in the finished shade.
A post-dye wash removes unfixed dye and process residue. In reactive dyeing that job goes to a separate product class, the washing-off agents; in disperse and direct dyeing a general-purpose washing agent usually covers it.
Why is foam a problem?
In exhaust machines foam interferes with fabric circulation. Foam building up inside a jet stops the rope running cleanly, sets crease marks, and in bad cases makes the pump draw air.
Foam behaviour depends on the machine. An agent that behaves in a high liquor ratio HT vessel can foam in a short-liquor jet. Product choice is therefore not settled on detergency alone; whether an antifoam has to run with it is decided up front.
|
Machine |
Foam tolerance |
Note |
|---|---|---|
|
Short-liquor jet |
Low |
Antifoam is in most recipes |
|
Overflow |
Medium |
Judged together with circulation speed |
|
Rope / HT vessel |
Medium |
Foam falls away as temperature rises |
|
Pad, continuous |
Low |
Foam in the trough spoils pick-up |
What changes on blends?
A cotton/polyester blend carries two separate soil groups: the natural wax on the cotton and the spin finish on the polyester. They do not dissolve the same way. Washing agents built for blends therefore carry more than one surfactant and cover a wider range of soil than a single-component product.
Polyester adds oligomer. Oligomer is not soil but a fragment of the polyester itself that migrates to the surface at HT dyeing temperature. What the washing agent has to do is keep it suspended in the liquor until the bath is dropped, before it cools and deposits.
Product comparison
Comparison
| Product | Description | Suitable fibres | Foam | Dosage | Temperature |
|---|---|---|---|---|---|
| DK WASH CT | Foaming washing agent | awaiting data | awaiting data | awaiting data | awaiting data |
| DK WASH 2K | General-purpose washing agent | awaiting data | awaiting data | awaiting data | awaiting data |
| DK WASH PG 40 | Washing agent for natural and synthetic blends | awaiting data | awaiting data | awaiting data | awaiting data |
| DK WASH PG 50 | Washing agent for natural and synthetic blends | awaiting data | awaiting data | awaiting data | awaiting data |
Products
- DK WASH 2K
General-purpose textile washing agent that takes spin finish and handling soil into the bath in pre-treatment.
- DK WASH CT
Foaming washing agent that emulsifies soil off greige cloth where foam itself works as a carrier in the machine.
- DK WASH PG 40
Washing agent for natural and synthetic blends, emulsifying residues of different chemistry in one bath.
- DK WASH PG 50
Washing agent for blends, with higher detergency on lots that carry a heavy load of synthetic spin finish.
Common questions
Why make a foaming washing agent at all?
In some processes foam is wanted. In garment washing and on open-width machines the foam carries soil mechanically off the surface. The decision follows the machine: the same product causes trouble in a closed jet.
Is a washing agent the same as a wetting agent?
No. A wetting agent speeds up how fast water penetrates the fabric, and its effect is measured in seconds. A washing agent emulsifies released soil and holds it in the bath. Some products do both, but what you ask of them differs.
What pH should the wash bath run at?
It follows the soil. Oil and wax saponify more readily in alkali, while on dyed cloth high alkali can shift shade. Working ranges for the Derin Kimya products are given on the product pages: pending from the client.
Other families in this category
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Guides on these products
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.