Textile Plasma Treatment: Test Surface Effects, Ageing and Durability

A drop of water can disappear quickly on a treated fabric while the finished product still fails. The effect may fade during storage. A coating may peel after washing. The cloth may also lose strength even though its surface looks sound. A useful textile plasma treatment trial must answer each of those questions.

Start with the result the next process or customer needs. The aim might be more even printing or better wetting before coating. Another project may need a lasting water-repellent finish. These are different aims. They do not share one treatment recipe or one test for success.

This guide explains how to turn a surface-treatment claim into a clear trial. It includes original calculations for wetting, retained strength and process energy per area. The example results are invented to explain decisions. They are not reported factory data, recommended machine settings or industry acceptance limits.

Understand what plasma changes

Plasma is a gas that contains charged and reactive species. These include electrons and ions. Electrical energy can create plasma in a treatment system. Its active species can act on the material surface. Plasmatreat's explanation of plasma describes three distinct uses. They are surface cleaning, activation and thin-film coating.

Cleaning removes surface contamination. Activation changes how the surface acts with a liquid or another material. Etching removes material and can change surface texture. Coating deposits a new layer from a supplied precursor. Several effects may occur together. Each still has its own role.

Ask the supplier which effect the proposed process is meant to create. Activation may prepare a surface for an adhesive. That step does not itself provide a finished protective coating. A trial that includes an added finish must identify that finish. Its success cannot all be credited to plasma alone.

The word “surface” describes where treatment acts. It does not promise that every useful fabric property stays unchanged. The surface is part of each fibre, and fibres carry loads within a fabric. Treat strength, handle, colour and the intended function as results to measure.

A study by Klébert and colleagues illustrates the issue. They exposed a particular polyester twill to atmospheric air plasma. Wetting improved, but longer exposure weakened the tested fabric. Further treatment brought little extra wetting benefit. This supports checking both function and damage. It does not set a safe exposure time for other machines or cloth.

Define the material before choosing the settings

“Polyester fabric” is not a complete trial specification. Record the fibre content, yarn type, construction, mass per area, width and face. Identify the dyeing and finishing history, including any coating, softener or handling treatment. Record the lot and its condition when it enters the trial.

A surface process meets the surface actually present. A supplier may have tested clean laboratory cloth. A roll with a production finish can have a different starting surface. If the new route includes cleaning, record that step. Include its resource use when comparing routes. Do not quietly compare cleaned treated fabric with dirty control fabric.

Take matched material for the control and treatment groups. Distribute specimens across the usable width and along the trial length. Preserve their positions in the records. A strip taken only from the centre cannot show whether the edges received the same treatment.

Treat a change of fabric face as a change in the trial. One exposed face does not establish that the reverse face performs equally well. A folded edge, crease or layered area also needs its own assessment. If the product uses both faces, include both in the acceptance plan.

Compare the process route, not just the power label

Low-pressure treatment uses a chamber operated below atmospheric pressure. Atmospheric treatment needs no such chamber. It still needs controlled equipment and a clear process. The Plasmatreat system FAQ describes this type of system. Its guidance lists speed, treatment width and nozzle distance among the key settings.

For a batch chamber, record how the load is placed. Record gas, pressure, treatment stage and time too. Allow for loading, pump-down and unloading when you assess output. A short discharge time does not necessarily mean a short total batch cycle.

For a moving web, record the active width, line speed, gas supply, working gap and passes. Record the generator setting and what that setting measures. Include starts, stops and any sections held near the treatment zone. A steady running sample cannot establish what happens during a line stop.

Do not copy a power value from a paper into a production instruction. Different equipment can distribute energy differently. The gas, geometry, gap, material and exposure pattern also matter. Use the same care in making a fair comparison. Develop the actual process with the equipment specialist.

The same care applies to temperature. A description such as “cold plasma” is not a temperature record for the fabric. Measure the relevant material condition during the trial, using an agreed method. Check for visible marks, distortion and changes that appear only in later use.

Match each claim to the evidence it needs

The test should follow the intended function. A water drop is useful only when its meaning is clear.

AATCC TM79-2025 covers water absorbency for textile materials. AATCC TM197-2022 addresses liquid transport in vertically aligned fabric specimens. Their public scopes describe different measurements. Use the required full method and edition when reporting a standard test.

Contact angle can help characterize wetting, but fabric is a porous structure. The test liquid may enter it while the image is being measured. KRÜSS's textile guidance discusses this absorption issue and different measurement arrangements. Agree the method, liquid, timing and sample presentation with the laboratory.

A drop may vanish before the instrument can measure its shape. That is not a precise zero-degree result. Report what happened and the method's limit. A drop may also remain when the test ends. Its absorption time is then unknown, rather than equal to the test period. State these limits in the results.

For a bond, test the actual material pair and joining process. Keep the adhesive and its amount fixed. Keep cure, pressure and conditioning fixed too, unless one is a planned variable. Record where failure occurs. A bond may split at an interface, or the cloth may tear. These are different failures, even when the measured forces are close.

Build time into the test plan

Immediate results describe immediate performance. They do not establish the useful storage life of an activated roll.

In Feitor and colleagues' polyester study, the team tested wetting again after storage. The benefit fell with age, though treated cloth could still wet better than its control. The study shows why time needs testing. It does not set a shelf life for all treated cloth.

Zhang and Fang's printing study also found that storage after treatment affected printing. The public abstract gives a preferred printing window for that study. A factory needs to test its own window. Use the actual fabric, treatment, ink and storage conditions.

Choose test times from the production route. Include the usual delay before the next operation and a credible longer delay. If material may wait over a weekend, test that waiting period. If the customer stores a finished product, include the relevant storage exposure separately.

Keep two time questions distinct. First, how long can treated fabric wait before coating or printing? Second, how long does the final coated or printed product keep working as required? Passing the first question does not answer the second.

Record temperature, humidity, packaging and handling during storage. Keep controls under the same conditions. Use fresh matched specimens where a test changes or consumes the material. Reusing a wetted specimen can mix the effect of the earlier test with the effect of ageing.

Read an original trial without choosing a misleading winner

Consider a fictional woven-fabric project. The team compares untreated cloth with two laboratory settings, A and B. Both settings are approved for the trial. All material comes from the same trial lot. The settings are labels, not instructions for a machine.

The team uses a defined internal drop test for screening. It does not claim that these invented results constitute an AATCC report. Six separate locations are measured for each wetting condition. The values below are the arithmetic means. Strength results are separate means from matched mechanical specimens in one stated direction.

For fresh setting A, the six wetting times are 10, 12, 11, 13, 12 and 14 seconds:

Mean = 72 ÷ 6 = 12 seconds.

The reduction from the fresh control is:

(120 − 12) ÷ 120 × 100 = 90%.

That is a reduction in the measured wetting time. It is not a 90% gain in every aspect of absorbency. It also says nothing by itself about bond strength, comfort or drying.

Setting A's mean rises from 12 to 38 seconds after storage. Compared with the seven-day control, the reduction is:

(120 − 38) ÷ 120 × 100 = 68.3%, rounded.

The stored sample still wets faster than its control. Yet that may be insufficient for the intended process. Before the trial, this fictional team required a mean of no more than 30 seconds after seven days. A fails that criterion, and B at 32 seconds fails it too.

Now calculate the retained maximum force:

A: 665 ÷ 700 × 100 = 95%.

B: 588 ÷ 700 × 100 = 84%.

Assume the project also requires at least 90% retention and an absolute mean of at least 640 N. A passes those two strength checks. B fails both. Its slightly faster fresh wetting does not make it the better production choice.

Neither setting satisfies the whole trial brief. The correct action is to investigate and revise the route, then test again. The team might examine the treatment-to-use delay or a different controlled process. It should not silently discard the seven-day requirement after seeing the results.

These means are only the start of a report. Show the individual results, locations and spread. Repeat promising conditions in independent runs and relevant lots. Six locations on one piece cannot prove how every lot will perform. A small difference may also reflect test variation. Use suitable analysis before claiming that it is statistically proven.

Check strength with the right method and comparison

ISO 13934-1:2013 describes a strip test. It measures maximum force and elongation at that force. Its scope mainly concerns woven fabrics and contains limits for other material types. It is not a default method for every coated, nonwoven or technical textile.

Choose the test that suits the fabric and its specification. Use the same specimen direction, conditioning and test conditions. Compare like with like: a treated wet result and an untreated dry result answer different questions.

Retention alone can mislead. A weak control can give a high retention percentage. Yet the treated cloth may still fall below the required strength. Strong cloth can also pass the absolute limit despite losing a large share of its strength. Check both the final result and the loss due to treatment.

Maximum force is not the only possible concern. Depending on the product, examine elongation, tear behaviour, abrasion, stiffness, colour and appearance. Select those checks because they matter to the garment or next process. A long list of unrelated tests does not make the decision clearer.

Calculate process energy per area carefully

A useful process record connects power to the area moving through the machine. For a simple, fully covered web treatment:

Nominal generator energy per area = P ÷ (w × v).

Here, P is generator power in watts. The treated width w is in metres. Web speed v is in metres per second. The result is joules per square metre. This figure describes the stated setup. It does not measure how much energy each fibre absorbs.

Suppose one fictional unit runs at 600 W over a 1.5 m treated width. The web speed is 20 m/min:

Speed = 20 ÷ 60 = one-third of a metre per second.

Area rate = 1.5 × one-third = 0.5 m²/s.

Nominal energy per area = 600 ÷ 0.5 = 1,200 J/m².

That equals 1.2 kJ/m², or about 0.333 Wh/m². If the same area receives two identical passes, the nominal sum is 2,400 J/m². Do not assume that two passes produce twice the desired surface effect. The material entering the second pass has already been treated.

Keep the face basis clear. This example concerns one pass over one face. With separate units on both faces, identify the power and coverage of each. If you divide combined power by a single-face area, explain that choice.

Exposure time is another record. If a simple uniform treatment zone is 0.25 m long in the travel direction, the nominal passage time is:

0.25 ÷ one-third = 0.75 seconds.

A scanning jet needs a different model. Include its path, overlap and dwell pattern. Equal average energy per area can hide gaps or spots that get too much treatment. Map the spread of treatment as well as calculating its average.

Separate nominal process energy from factory electricity

Suppose the same fictional line runs steadily for 120 minutes. Its gross treated area is:

1.5 m × 20 m/min × 120 min = 3,600 m².

At a constant 0.6 kW generator setting for two hours, nominal generator energy is 1.2 kWh. Suppose 180 m² is rejected, leaving 3,420 m² accepted. The accepted share is 95%, and nominal generator energy per accepted area is about 0.351 Wh/m².

Now suppose a separate meter records 4.8 kWh for the whole treatment run. Its boundary is clear. It includes the share of electricity used by auxiliary equipment and start-up activity for this run. The measured value is:

4.8 ÷ 3,420 = 0.00140 kWh/m², or about 1.40 Wh/m² accepted.

Those two energy figures describe different boundaries. Neither is an error merely because they differ. Report which equipment, operating periods and accepted output each includes. If compressed air comes from a shared plant, explain how its energy is measured or allocated.

A dry treatment stage does not prove that the whole route uses no water or chemicals. Compare the full routes, from preparation through later steps. Each route must deliver the same accepted output and performance. Include gases, added finishes, rejects and rework where relevant. Only measured, comparable routes can support a resource-saving claim.

Test washing and finished-product durability separately

Storage ageing and laundering are different exposures. A surface can survive storage yet lose its function during washing. A finish that passes one wash may still fail the specified care sequence.

ISO 6330:2021 provides domestic washing and drying procedures for textile testing. Its public scope makes clear that a complete test includes both washing and drying. It also notes that changes in the procedure can affect results. State the selected procedure and edition in the report.

Agree the care conditions and assessment stages before testing. Keep detergent, machine type, loading and drying consistent with the selected method. “Washed five times” is incomplete without those details. A chosen laboratory exposure does not prove a lifetime of use. That claim needs its own evidence.

After care, repeat the relevant functional and mechanical checks. For a bonded fabric, assess attachment and the observed failure mode. For a printed fabric, assess the required print properties. For a garment, include dimensions and appearance when these form part of acceptance.

ApparelDiary's fabric shrinkage testing guide explains size checks after care. A surface finish may stay sound while the garment no longer meets its size limits. Keep both decisions in the final report.

Diagnose failures before changing the recipe

If the centre passes while one edge fails, first check the specimen map. Then review coverage, alignment, web handling and material differences. Raising power everywhere may damage the region that passed. It may also leave the gap in coverage unchanged.

If fresh wetting is good but aged performance fails, review the delay and storage records. Check that controls and treated samples had equal exposure. Do not label every loss “hydrophobic recovery.” First check for contamination during handling or changes in the test method.

If wetting passes but bonding fails, inspect the complete joining process. Check the adhesive, cure, pressure and material pair, then examine the failure surface. Wetting can support bonding, but it is not a bond acceptance test.

If strength falls, preserve the failed samples and process records. Review exposure, local treatment and thermal history with the specialist. Do not keep increasing treatment simply because the fresh water-drop result still improves.

Keep the machine's specified guarding and extraction in place during trials. Follow its operating controls too. The cited Plasmatreat FAQ, for example, requires extraction for its system. Follow the instructions for the actual equipment and materials. A laboratory demo cannot replace the factory's operating procedure.

Separate plasma from an added finish

If the route adds a finish, compare four groups. Use untreated cloth, plasma only, finish only, and plasma followed by finish. Keep the fabric and relevant processing conditions comparable. This design helps show whether the two steps work better together.

Suppose only the combined route passes a bond test. That supports further work on the combination. It does not prove which chemical mechanism caused the result. In another trial, the finish-only group may also pass. Before adding plasma, compare how long each result lasts and how steady it is. Compare total resource use too.

The groups still need valid controls. The combined route may use a different cure temperature or coating amount. Either change could help explain the result. Identify them as planned factors, or hold them constant. A comparison with several hidden changes cannot isolate the contribution of plasma.

Common questions about textile plasma trials

Can a successful polyester trial qualify wool or cotton?

No. A result belongs to the tested material and process. Different fibres, constructions and existing finishes create different starting conditions. Define the intended benefit for the new material and test it with its own matched control. A successful exposure time for polyester is not a tested setting for wool.

Does a low water contact angle prove better comfort?

No. It describes one aspect of wetting under a stated test. The garment's intended comfort claim needs suitable evidence for the properties involved. Water uptake, liquid movement and drying are separate questions. A single surface measurement cannot stand in for all three or for a wearer assessment.

Can plasma replace an existing preparation step?

Treat replacement as a process-development question. Test final quality under both the new route and the current route. Check every role of the step you plan to remove. The first wetting test may miss some of its effects. Accept the change only when it meets the full product and process needs.

Release a defined process window

Approve a range that the results support. One successful setting from one afternoon is not enough. State which material, machine setup and operating limits are covered. State the longest tested wait before the next step and the tested storage conditions.

Link each result to its roll and fabric face. Record the test location, time and process version too. Record exceptions and the response to a failed check. Review changes to the finish, fabric construction or machine setup. Check whether the old approval still applies.

ApparelDiary's quality assurance and quality control guide explains how these roles fit together. The process needs clear, controlled instructions. Testing checks the cloth that the process produces.

Plasma treatment earns its place when the whole product meets the brief. Cost and output must also be repeatable. A sound trial links the surface test to the next process. It checks retained fabric properties and how long the result lasts. That gives the factory more to act on than a striking water-drop result alone.

References and technical guidance

• Plasmatreat: What is plasma? Surface activation, cleaning and coating.

• Klébert and colleagues: Degradation phenomena on atmospheric air plasma treatment of polyester fabrics; author manuscript.

• Plasmatreat: System and process FAQ.

• AATCC TM79-2025: Absorbency of Textiles; public scope.

• AATCC TM197-2022: Vertical Wicking Rate of Textiles to Specified Distances; public scope.

• KRÜSS: Wetting and coating of textiles.

• Feitor and colleagues: Evaluation of Aging in Air of Poly (Ethylene Terephthalat) in Oxygen Plasma.

• Zhang and Fang: Aging of surface properties of polyester fabrics treated with atmospheric pressure plasma for inkjet printing; published abstract.

• ISO 13934-1:2013: Fabric maximum force and elongation using the strip method; public scope.

• ISO 6330:2021: Domestic washing and drying procedures for textile testing; public scope.