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Small-Diameter Tube Products: Choose the Knitting and Make-Up Route First

Author：KUNYUAN Machine Manufacturer TIME：2026-08-28

Tubular-product route map

Draw what happens after the tube leaves the needles

The old article confused an industrial small-diameter circular machine with a hobby spool knitter. A useful replacement starts from the manufacturing route: some products need a stable continuous tube, some need body-size zones or separation, and others are only feedstock for cutting, linking, coating or assembly.

Lay out the finished item, an opened construction sample and the greige tube if available. Mark knitting direction, circumference changes, ends, seams, cut lines, stretch and all downstream operations. The supplier should be able to point to each requirement in the proposed machine or make-up scope.

Avoid forcing every product onto one route merely because its diameter appears similar. Gauge, needle count, bed arrangement, electronic selection, feeds and take-down decide what can be formed repeatably. The size table and boundary samples decide whether that capability is commercially useful.

Continuous-tube route: optimize usable length and end handling

For sleeves, liners or components cut from a tube, define circumference tolerance, usable length, wale alignment, spirality, end waste and the method used to separate pieces. State whether the final product is greige, dyed, coated, bonded or sewn.

Measure at several roll positions because tension and take-down drift can create a tube that passes near the start and fails later. Include roll build and downstream cutting yield in the output figure.

Separated-piece route: connect program, size and end condition

If the machine produces individual pieces or programmed zones, record the separation yarn or mechanism, finished length, welt or opening, and every size-specific file. Identify remaining cuts and seams so a partially complete piece is not marketed as finished.

Run boundary sizes with production yarn. Preserve program revision and the measured garment or component after relaxation, because recovery can shift both length and zone position.

Make-up route: place every cut, join and finish beside knitting time

Time cutting, linking, sewing, closing, washing, blocking, coating and inspection on the same sample family. Add labour skills, tooling and work-in-process limits. Fast knitting cannot improve delivery if a manual join remains the bottleneck.

Define responsibility for defects that appear after assembly. A marked greige sample and operation card help separate tube variation from cutting distortion, seam tension or finishing shrinkage.

Release the product family with explicit configuration changes

Choose the smallest circumference, longest piece, heaviest yarn, most complex zone or strictest tolerance from the sales plan. Record accepted output, stops, waste, make-up time and final dimensions.

List which products share the approved cylinder, needles and program environment, and which require a conversion or another platform. A written exclusion is safer than an informal promise that a future style should also work.

Small diameter tubular knitting machine reference — Identify whether the machine supplies continuous tube or separated pieces.

Tubular knit route and product reference — Mark cut, seam, closure and finishing steps on the physical sample.

Finished small-diameter knit inspection reference — Accept the product after its real downstream route, not at the knitting roll alone.

Tube-route handover

Route	Knitting output	Next operation	Final acceptance
Continuous tube	Length and circumference by roll position	Cut, join, coat or assemble	Usable yield and dimensional tolerance
Separated piece	Programmed length, zone and end	Openings, labels or limited seams	Finished size and separation quality
Body-size garment	Size-linked program and yarn plan	Wash, block and garment make-up	Zone position, fit and recovery
Technical component	Traceable tube lot	Product-specific processing	End-use test owned by named party

Tubular-product route questions

Is a spool knitting machine the same as an industrial small circular machine?

No. The names can be confused online, but their scale, construction, control and applications differ. Identify the exact industrial platform and model.

What determines tube circumference?

Cylinder and needle count matter, but yarn, structure, stitch settings, stretch and finishing also affect the finished measurement.

Can a continuous tube be called seamless?

It may have no longitudinal seam, but cutting, closing, openings or assembly can remain. Describe the complete make-up route.

How should output be reported?

Use accepted final units or usable tube per scheduled hour, with knitting stops, separation or cutting waste and downstream capacity visible.

What is the safest trial range?

Test the product boundaries most likely to change configuration or fail tolerance, not only the easiest middle size.

Conclusion

Choosing a small-diameter machine for tube products is mainly a route-design task. Once continuous knitting, separation, shaping and make-up responsibilities are visible, the mill can select a configuration, measure its real bottleneck and release only the product family that the evidence supports.

Compare the route drawing with the small diameter circular knitting machine range and ask the supplier to mark every conversion, make-up operation and boundary sample in the offer.