High Pile Circular Knitting Machine Technology: Cutting, Shearing and Quality

The ground structure holds the pile system and transmits withdrawal forces. Record its yarn separately from the pile yarn, draw the relationship visible on both fabric faces and mark machine direction. Inspect for lines, weak areas, distortion and exposed ground before cutting or raising changes the appearance. A dense surface can conceal a poor foundation until handling or finishing releases loops.

Measure a labelled full-width strip in the greige condition using the agreed basis. Preserve width, weight, roll position and visible-defect notes. If a repeating line appears, map its interval and circumference before adjusting the machine. The ground assessment should close independently: an attractive pile face is not evidence that the retaining architecture or reverse side is acceptable.

Label the pile yarn by material, count, lot and package condition, then trace its own delivery route. Do not copy the ground-yarn setting or publish a generic tension figure. The required operating window depends on the installed machine, elements, yarn and fabric construction. During the trial, include a package change and controlled restart, marking loose loops, bands, bare patches, contamination or unusual fly on the roll.

Inspect the surface at the machine, after winding and after representative transfer to finishing. Keep one section uncut. If loops pull out during handling, determine whether the evidence points to formation, retention, withdrawal or external contact before changing the cutting stage. The best boundary sample uses the most demanding agreed yarn or surface condition, not only the easiest article produced for a photograph.

State exactly which operation is intended. Cutting can open specified loops; raising can develop fibres from a knitted surface; shearing can level the developed face. They are not interchangeable labels, and their settings belong to the relevant equipment manual and trained process owner. Before processing, mark orientation and roll position on a full-width piece. Keep an adjacent control outside the finishing batch.

After each approved route, inspect cover, levelness, exposed ground, stripes, loose fibre and structural damage. Record process changes rather than allowing a finisher to improve the sample invisibly. A surface fault may be amplified, reduced or created downstream. Paired evidence is what lets the knitting and finishing teams assign responsibility without relying on memory.

Evaluate the finished piece under consistent lighting across usable width and several roll positions. Compare surface uniformity, hand where specified, width, weight and dimensional response with the greige baseline. Add the buyer's relevant durability, shedding or care tests when required, naming the method and acceptance owner. A knitting-machine trial alone does not certify a specialized end use.

Calculate accepted output after cutting loss, finishing loss, rejected sections and rework. Then repeat the approved route with the receiving team and another labelled lot. Store greige control, finished sample, machine record and finishing record under one sample code. Commercial release should state which architecture and process were demonstrated, which options were used and which requested surfaces remain open for trial.