Running a Machine Trial with Your Own Material Before You Order

Decide the question before you ship anything

A trial should answer one or two concrete questions, written down and agreed with the supplier by email. Examples:

• Can this circular knitting machine produce our 30/1 combed cotton single jersey at our target weight and width without excessive holes?
• Can this ring frame spin our blend at our twist and count with acceptable end breaks?
• Will this stenter reach our residual shrinkage target at our line speed?

A vague request such as "please test our yarn" usually produces a nice-looking sample run at whatever settings suit the demo machine.

What to send

Enough material, from one lot. Ask the supplier how much they need for set-up plus the run itself; set-up and adjustment can consume a meaningful share. Send material from a single production lot and set aside part of the same lot. If the trial sample later disappoints, you can test the set-aside material to see whether the problem was the input.

Specification sheet. For yarn: count, fibre and blend, twist level and direction, package type and any lab data you have. For fibre: length, fineness and finish. For fabric: construction, weight, width and fibre content. If you are trialling finishing equipment, include the chemical recipe you use or intend to use. For loom trials, the same details that belong in a weaving machinery enquiry apply.

A reference sample. A piece of the product you are trying to match, produced on your existing equipment or by your customer's approved supplier, gives everyone a target.

Packing that protects the material. Fibre and yarn absorb moisture and can be crushed or contaminated in transit. Seal packages and label each with lot number and contents.

Customs treatment of trial material and returned samples differs by country; check with your forwarder or customs broker before shipping.

Pin down the configuration being tested

This is the step buyers most often skip. Ask the supplier to state, in writing, the exact build of the demonstration machine:

• Model and year of the demonstration unit.
• Gauge, diameter, working width, number of feeders or spindles as applicable.
• Key components that vary by order: drafting system, needle or hook type, cam or sinker set, nozzles, heating method, drives.
• Control software version.

Then compare it line by line with the machine you would actually order. Where they differ, ask the supplier how the difference is expected to affect your result, and note the answer.

Record the settings, not just the result

Ask for a settings sheet signed or emailed by the supplier's technician, covering every adjustable parameter used to make the sample: speeds, drafts, twist, tensions, stitch length, temperatures, dwell times, chemical concentrations. Ask also for a note of how many attempts or adjustments were needed before the sample was produced, and for photos or short video of the machine running your material.

Without this sheet you cannot reproduce the result, cannot compare it with a second supplier's trial, and cannot write it into a contract later as a performance condition.

Judging the samples

Visual judgement has a place but needs discipline. Compare trial samples with your reference sample side by side under the same light. For colour, AATCC EP9 sets out a procedure for judging colour difference visually against a standard, which is a better basis than looking at a sample under office lighting.

Physical properties need a laboratory. Textile properties change with temperature and humidity, so samples should be conditioned before testing. ISO 139 defines the standard atmosphere for conditioning and testing textiles for physical and mechanical properties, and an alternative atmosphere the parties may agree to use. For yarn strength, ISO 2062 covers single-end breaking force and elongation at break using a constant-rate-of-extension tester, and it describes more than one test method. Ask your lab which method it uses, and use the same lab and method for every supplier you compare.

Test enough material. A single swatch or a few metres of yarn may not reveal faults that occur at intervals. Ask for samples taken at the start, middle and end of the run.

Shipping samples back. Request that samples are packed flat or on their original packages, sealed, labelled with the settings sheet reference, and not pressed, washed or finished unless that is part of the trial. Ask the supplier to keep a duplicate set in case of loss.

Why one configuration does not stand in for another

Machine settings change yarn and fabric properties, sometimes strongly. In a published study at Daffodil International University, researchers ran 103 tex jute yarn on a converted ring spinning frame at spindle speeds between 5,000 and 9,000 rpm, holding draft and twist constant, and found that spindle speed significantly affected strength, elongation, yarn breakage and productivity, leading them to identify an optimum speed (Miazi, Mahabubuzzaman and Kabir, DIU Journal of Science and Technology). That is one setting on one material; a different drafting system, gauge, needle type or heating method can shift results further.

So a successful trial on a 30-inch, 28-gauge demonstration machine tells you little about how a 34-inch, 24-gauge machine will perform the same with your yarn. Even a precisely named build, such as the 34-inch 108-feeder double-jersey series, still needs the offered gauge and fabric output matched to a defined sample. Retrofits raise the same issue: a top-drive four-roller compact-spinning device is a conversion for an existing ring frame, and its published description calls for a frame-specific engineering review before expecting a particular yarn result. If your order differs from the demo build, either ask for a trial on a matching configuration, or write the trial result into the purchase contract as an acceptance condition to be re-verified at the factory acceptance test.

Where listed equipment already points to a trial

Several machines in the directory publish data that only a trial can turn into a buying decision. The YQ800DS draw-texturing machine gives a base arrangement and heater lengths, but its listing notes that stable output and yarn quality depend on an agreed material and process trial. The SJ758 rapier loom names paper cord, nylon filament and mat grass as intended materials while its two parameter blocks conflict, so a trial on your material and fabric structure settles what the paperwork cannot. The AirMax glove range and the WLT-7F X1 sock machine both publish speeds that are not pairs-per-shift figures. The WSF200A precision winder describes active unwinding as both present and optional, which the quotation must resolve before a yarn-handling trial means anything.

Cost and time

Whether a trial is free, charged, or credited against an order is a matter for negotiation with each supplier; no published industry norm was found for this page, so ask for terms in writing before shipping material. Allow time for material transit both ways, the supplier's demo-machine schedule and your laboratory's turnaround.

Sources

1. "ISO 139:2005 – Textiles – Standard atmospheres for conditioning and testing", NSAI Standards Store (Ireland), accessed 2026-11-04. View source
2. "ISO 2062:2009 – Textiles – Yarns from packages – Determination of single-end breaking force and elongation at break using constant rate of extension (CRE) tester", NSAI Standards Store (Ireland), accessed 2026-11-04. View source
3. "EP9 – Visual Assessment of Color Difference of Textiles" (AATCC EP9-2025), AATCC (Association of Textile, Apparel & Materials Professionals), accessed 2026-11-04. View source
4. Md. Osman Ghani Miazi, A. K. M. Mahabubuzzaman, Md. Mazedul Kabir, "Effect of Spindle Speed on Textile Properties and Productivity of Fine Jute Yarn", DIU Journal of Science and Technology, Vol. 4, Issue 2, Daffodil International University, accessed 2026-11-04. View source