Introduction: Knitwear and hoodie factories choosing a PLC batch dyeing machine need to match recipe count, batch weight, temperature curve, chemical dosing, and power requirements to the actual workshop.
A single drum may run a 60 kg sweater batch in the morning and a 200 kg hoodie order in the afternoon, each with a different dye system, temperature curve, and dosing sequence. That mix makes planning more demanding than selecting the largest drum on a quote. Batch weight, recipe storage, heating curve, chemical feeding, and electrical supply must line up before a configuration makes sense. Settle those numbers first, and one machine can cover a wide order book; skip them, and every batch becomes a correction job.
Choosing an industrial knitwear and hoodie dyeing machine starts with the load, not the drum size. Garment dyeing runs after cutting and sewing, so the drum holds finished pieces: a fleece hoodie with a thick body panel, a double-layer hood, ribbed cuffs, and sometimes a drawcord and eyelets; or a wool-blend sweater with an open knit structure and bulky yarn. Those pieces tumble over one another, so the drum must be wide and deep enough for garments to fall freely instead of sitting in a compressed heap. Load weight drives that decision far more than piece count. Rotation speed and liquor ratio determine how the load behaves inside the drum. A 1 to 100 RPM range lets one machine run slow, gentle turns for a wool-blend sweater program and faster turnover for a durable cotton fleece hoodie. The LD series is rated at a 1:2 to 1:8 liquor ratio, which lowers the water and steam use behind each batch. It also means every kilogram of garment competes for less bath, so even distribution in the drum becomes part of the recipe rather than a habit an operator develops over years. Plan around the batch weights your order book actually produces. Temperature planning completes the picture. Reactive, pigment, and sulfur programs for cotton fleece, terry hoodies, and knitted sweaters all run at atmospheric conditions, and the LD series works up to 99°C inside an insulated closed drum, with softener finishing handled in the same vessel. Polyester work that runs above 100°C belongs on different equipment. Separating those orders on paper before sizing anything prevents a surprise later. With that ceiling clear, the drum, drive, and dosing system can be matched to the knitwear you actually process.
A PLC touchscreen is useful when it removes routine decisions from the operator. On a knitwear or hoodie line, the person loading the drum changes between shifts, and small differences in water volume, dosing point, or heat ramp show up later as shade drift between batches. Standard batch control practice, as described in ISA88, treats a recipe as a stored sequence the controller executes the same way every time. In garment dyeing, that sequence has to cover water, heat, chemicals, and time together.
With multi-recipe storage, a factory keeps separate programs for a 180 kg reactive black on cotton fleece, a pigment wash on loopback terry, and a soft shade on a wool-blend sweater, all on the same controller. The machine calculates water volume from the liquor ratio and actual load weight, and flow meter control holds the fill to that number. The operator stops doing bath arithmetic at the machine, and a batch planned at 1:6 stays at 1:6 whether the person running it has ten years on the drum or ten days.
Proportional heating and cooling control how fast the bath moves between setpoints, which matters on knitwear because a fast ramp on a wool blend can damage the surface and a fast cool-down can set creases. Curve chemical dosing adds dye and auxiliaries along a defined ramp instead of dumping them in at the start, and dual chemical feeding runs two streams independently, typically dye and alkali or dye and a leveling agent. Real-time pH monitoring gives a live reading through fixation, where pH drift is a leading cause of shade variation on thick hoodie seams and layered hood panels. Stored recipes remove most operator variation, but shade still depends on dye lot, water quality, and fabric preparation, so a shade check at the start of each lot remains normal practice. If your process needs more than two chemical streams, multitank dosing and an office-side central computer interface may be available as options on the LD series; confirm availability and scope with your supplier so the quote matches the configuration you need.
Model choice follows the load, and the workshop decides whether the model fits. The LD series runs from LD-70 at 850 L and 5.5 kW, through LD-130 at 1500 L and 11 kW, LD-420 at 4200 L and 22 kW, up to LD-510 at 5300 L and 30 kW. Those motor power figures add up quickly once two machines, dryers, and washing equipment share a panel. Bring your connected load, transformer capacity, the voltage and frequency your plant runs on, and the heating capacity you can free up. Footprint is the detail that catches most factories out. LD-510 measures 3350 × 2200 × 2700 mm, LD-420 measures 2850 × 2200 × 2520 mm, LD-130 measures 2000 × 2000 × 2350 mm, and LD-70 measures 1440 × 2045 × 2050 mm. Add clearance for tilting discharge, loading access, chemical tank reach, and walkways. Ceiling height counts too, both for the machine and for whatever lifting equipment moves garment bags to the drum, so measure the actual bay rather than the whole room. Water and drainage deserve the same treatment. A 1:2 to 1:8 liquor ratio keeps consumption low, but the fill rate and drain size still have to support the cycle time you want to run. Note incoming water pressure, holding tank capacity, and whether the drain clears a full bath quickly. Floor loading matters as well, because a loaded 5300 L drum with wet knitwear is a lot of moving weight. These details feed the technical proposal, and they are the hardest ones to change after delivery. The LD series covers an overall batch range of 30 to 300 kg, while the dry load rating for each individual model comes from the technical documentation your supplier issues. Ask for those ratings against your real order sizes, along with delivery schedule, installation support, and spare parts arrangements. An industrial dyeing machine manufacturer can translate these numbers into a concrete configuration, but the quality of the proposal depends on the data you send. When you approach industrial garment dyeing machine manufacturers, provide your batch profile, cycle times, and floor plan.
Knitwear and hoodie dyeing rewards planning because the load is bulky, the fabric varied, and the shade tolerance tight. Settle batch weight, recipe count, temperature curve, chemical dosing, and power before comparing models, and the shortlist narrows fast. LiYing Machinery is a textile dyeing machinery manufacturer, and the LD series is designed around this planning sequence. Garment dyeing machine manufacturers can quote the same drum size with different PLC and dosing packages, so compare proposals on the same batch profile rather than on drum size alone. Stored PLC recipes, proportional heating and cooling, curve dosing, dual chemical feeding, and live pH monitoring take most of the operator variation out of the process. Then check what the building can host. Send LiYing Machinery your batch profile, cycle times, and floor plan, and ask for a configuration built around them.
A：Start from the batch weights you run most often, not the largest order you ever took. Note the typical hoodie or sweater load in kilograms, how many shades run per week, and how long each program occupies the drum. Then match those figures to the LD series spread: 850 L on LD-70, 1500 L on LD-130, 4200 L on LD-420, and 5300 L on LD-510, with a 30 to 300 kg overall batch range across the series. Ask LiYing for each model's dry load rating against your own numbers.
A：The ones that take decisions away from the operator. Multi-recipe storage keeps each program on file, automatic water calculation by liquor ratio sets the fill from load weight, flow meter control holds that volume, proportional heating and cooling follows a defined ramp, curve chemical dosing adds dye and auxiliaries at the right moment, dual chemical feeding runs two streams at once, and real-time pH monitoring shows where the bath sits during fixation. Together they hold a reactive, pigment, or sulfur recipe steady across shifts.
A：Collect the motor power of the models you are weighing — 5.5 kW for LD-70, 11 kW for LD-130, 22 kW for LD-420, and 30 kW for LD-510 — and compare the total against your panel and transformer capacity with the rest of the plant running. Measure the bay rather than the room: LD-510 needs 3350 × 2200 × 2700 mm, plus clearance for tilting unloading, chemical tanks, loading access, and ceiling height. Add water pressure, drain capacity, and floor loading before requesting a quote.
Textile Learner: One stop solution for textiles
