Hot-air stenter family

Published specifications

Values below come from the maintained catalogue record. The guide review date does not renew an earlier specification: read the dated source notes and confirm a current, matched configuration before comparing products.

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A stenter usually closes a dyeing and finishing route, taking wet cloth and sending it on dry, set and at width. Yonglitong's process description lists the modules a line can hold: entry and exit devices, padding, hot-air circulation, cooling, weft straightening, chambers, overfeed, width adjustment and moisture extraction. Your quotation should say which of these you are buying and show them together on one layout drawing. [1]

1. Infeed and wet stage

   State how the cloth arrives, in rope, open width or on a batch, and whether a padder or other wet step comes before the frame. Give the moisture it carries in.

2. Edges, pinning and transport

   Name the edge opening, stripping and detection parts, the pin or clip transport, the straightener, the overfeed range and how width is set, all for your actual cloth.

3. Heated chambers

   Choose the heat source, number of chambers, nozzle and circulation layout, the running recipe and where the extraction scope ends.

4. Cooling and delivery

   Describe how the cloth is cooled and handed to the next stage, which appearance or handle limits apply and what room operators need around the exit.

• Overfeed window of −30% to +80%, adjustable per side.

The entry sheet allows overfeed anywhere from −30% to +80% as cloth moves from the upper overfeed roller onto the pin chain. The left and right overfeed rates have their own settings. For knitted goods, jets of compressed air uncurl the edges, an edge stripper follows, and an E+L system tracks the selvedge.

Have the quoted machine's overfeed range and mechanism written into the offer, together with the reference speeds the percentage is calculated from and the way an operator adjusts it. The range tells you what the hardware allows. The shrinkage your cloth ends up with depends on the fabric and the recipe you run.

Feed your own cloth through entry and pinning and watch the edges at the settings you plan to use in production. Ask for the compressed-air demand, the controls, the sensor make and the tasks left to the operator. The sheet says detection works on all materials and colours, so test it on your darkest and most awkward shades. [2]

Inside the oven, hot air travels through internal ducts that lift out, a circulation box and a set of nozzles. The oven sheet draws two heating layouts, one gas-fired and one using thermal oil or medium-pressure steam. They are alternatives, so pick the one your mill can supply.

Once the heat source is chosen, ask for its thermal duty and the fuel, steam or oil conditions it needs, the number and length of chambers, the temperature schedule, the circulation and extraction layout and how staff reach the ducts to clean them. The drawings carry no airflow, evaporation or heat-capacity figures, so those have to come in the offer.

A separate burner page gives a 40:1 adjustment ratio and mentions an optional burner. That ratio measures how far the flame turns down, and it says nothing about the energy use of the whole frame. The electrical-power line on that page is garbled. Ask for the current burner datasheet and a full machine load and utility schedule. [3] [4]

The YLT158 is the one model name tied to this range, through a China Textile News exhibition report from 16 October 2024. In it, the company manager says knit handling was added to a frame meant for woven goods: reduced tension, extra overfeed and a mechanical weft straightener.

The report describes modular PLC control and two geared drive motors run by inverters or by servo control. When you order a YLT158, write the revision and the chosen drive into the contract. For any other machine in the range, ask whether either drive is offered at all.

Working width, running speed, chamber count and energy per unit of output are absent from the report. Agree them in the offer and check them in your fabric trial. [5]

Yonglitong publishes subsystem detail but no complete datasheet for the range. Ask for each figure below tied to the exact model, fabric route and options, which also lets you set offers from different makers side by side. [1] [2] [3] [4]

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Set pass marks for your fabric and its end use before the run, then repeat the same run when the frame is installed. [1] [2] [3] [5]

1. Describe the incoming lot

   Write down blend, construction, width, weight per square metre, moisture on entry and how the cloth was prepared.

2. Freeze the recipe

   Note padding if used, speed, overfeed, width and transport settings, chamber temperatures, airflow, extraction, cooling and delivery.

3. Judge the finished cloth

   Condition the samples, then check width, dimensional stability, straightness, appearance and handle at agreed points along and across the piece. Keep labelled pieces for later.

4. Count good output and utilities

   Log accepted metres, rejects, stops and run time. For an energy comparison, fix the meters, the system boundary, the warm-up period and the output figure energy is divided by.

5. Repeat at handover

   Run the same acceptance test on site with the approved fabric, recipe and samples, and name who corrects any shortfall and who provides training, maintenance and spare-parts support.