针织缝合工艺：手工套口 vs 机器套口的权衡取舍

On a knitwear tech pack, the line marked "linking" looks like a single-word spec — and routinely gets one. But that one word determines whether the inside of a sweater shoulder looks like a clean stitch-by-stitch chain that traces the rib, or a folded ridge of trimmed yarn flagged shut with sewing thread. For a premium menswear designer, the seam is one of the first places a buyer judges construction, especially on cuffs, necklines and shoulders that are turned, pushed up, or photographed at flat-lay. This guide breaks down the three linking routes we run at Licheng, what each seam actually looks like in cross-section, what each adds to a quote in USD FOB China, and where on the garment to specify each.

A quick note on terminology before we go: "linking" in the knitwear factory sense means joining two finished knit panels loop-by-loop on a dedicated linker. "Overlock stitching" is the cut-and-sew style seam used on jersey and T-shirts. Many tech packs mix these terms, and many factories will quietly substitute the cheaper option if the spec is loose. Writing the line clearly is the buyer's job.

💬 Sourcing this for an upcoming project? Request a free quote → · MOQ 30 pcs · Sample in 7–15 days · WhatsApp us

A sweater is a stack of panels — front, back, sleeves, and on some styles a separate neckband, placket, pocket bag or shoulder yoke. These panels can be knitted to shape (fully fashioned) or cut from larger pieces (cut-and-sew), but in both cases they need to be joined. The join can be done three ways, and the choice shows on the inside of the garment in a way that is almost impossible to hide.

A premium buyer's eye goes to four places when judging knitwear: the hand of the yarn, the regularity of the stitch, the shoulder seam, and the inside of the neckband. Two of those four are linking decisions. A clean loop-to-loop neckband seam reads "properly made" before any logic about yarn or gauge kicks in. A bulky overlocked neckband reads "value tier" the moment the wearer pulls the sweater over the head.

This is also the seam that drives a meaningful chunk of the FOB cost. Linking is one of the most labor-intensive steps in sweater production and is priced per garment, not per kilogram, which is why a 12GG fine cotton crew with a fully hand-linked neckband can carry $2 of linking labor on a $14 FOB while a 5GG chunky cardigan with overlocked shoulders carries closer to $0.20.

A linker is a circular bed of points (small upright needles) sized to a specific gauge — 7-point, 12-point, 14-point. The operator places each loop from the edge of one panel onto a point, then places the matching loop from the other panel onto the same point. When the machine cycles, a needle pulls a thread of joining yarn through every paired loop in sequence, creating a chain stitch that is structurally identical to the knitting itself.

The defining feature, and the reason linking exists as a separate craft from sewing: the seam is built loop-to-loop, on grain, with no yarn cut and no fabric overlapped. The two panels meet at a single chain of joining yarn that disappears into the knit pattern when the seam is opened flat.

What varies between hand linking and machine linking is who loads the loops onto the points. In hand linking, an experienced operator places each loop individually with a small hook — the operator is the bottleneck and the quality control. In machine linking, the panels are fed in along a guide and the loader hooks loops in groups, faster but slightly less precise on irregular edges. Both produce a true linked seam. Overlock is a different machine entirely and produces a different seam.

This is the premium-tier option and the only one that delivers a true point-for-point chain across the full width of the seam. Every single loop from panel A meets the corresponding loop from panel B on its own point of the linker — a 60-loop edge takes 60 placements. On a fine-gauge cotton crew this can be 200 placements per neckband.

Seam cross-section. A single chain of joining yarn running through paired loops, no yarn cut, no overlap. When you open the seam allowance on the inside, the seam allowance is zero — there is no flap of yarn, just the stitch column ending. The seam direction follows the knit grain exactly.

Visible quality signal. From the outside, the join is invisible on a same-color seam and reads as a single neat stitch on a contrast neckband. From the inside, a hand-linked shoulder shows no bulk, no ridge, and the ribbed pattern continues across the seam unbroken.

Gauge compatibility. All gauges, 3GG through 14GG. This is the only method that handles 12GG and 14GG fine cotton without distortion.

Cost. Typical industry range $0.80-$2.50 per garment in linking labor depending on gauge and seam length. Higher gauge means more loops per centimeter and more time per seam.

Specify here. Visible necklines (crew, V, mock, turtleneck) on premium product; cuffs and waistbands on fine gauge; shoulder seams on any garment priced as premium; any seam on cashmere, merino or fine-gauge cotton where the inside of the garment will be seen.

Machine linking uses the same linker hardware but accelerates the loading step. An operator loads loops in groups along a guide rather than placing each one by hand. The result is still a loop-to-loop chain, but the loop-to-point alignment is less perfect at edge transitions and the chain occasionally skips a loop on irregular fully fashioned curves.

Seam cross-section. A chain of joining yarn through paired loops, same structure as hand linking, but with occasional micro-irregularities where the loader's placement was approximate. Seam allowance is still effectively zero, with a slight thickening where loops doubled up.

Visible quality signal. From the outside, indistinguishable from hand linking on a same-color seam under normal viewing. Side-by-side at contrast color you can sometimes see the chain riding up a fraction of a loop. From the inside, the seam looks linked rather than sewn, which is the signal most buyers care about.

Gauge compatibility. 5GG through 12GG comfortably. We do not run machine linking at 14GG or on 3GG chunky where the loop size makes group-loading unreliable.

Cost. Typical industry range $0.30-$0.70 per garment. The reason most mid-market sweaters use machine linking is straightforward — it carries 80% of the visual quality of hand linking at a third of the labor.

Specify here. Standard mid-tier product where the inside will not be photographed. Body seams on commercial knitwear. Cuff and hem joins on 7GG-12GG product where the gauge is not at the extremes. Shoulder seams on a product priced in the $15-$25 FOB range.

Overlock is not linking. It is a serger seam — two or three threads wrapping the cut edge of the panel with a chain stitch and a wrapping thread, the same construction used on jersey T-shirts. On knitwear, it is used either because the panels were cut from a larger blank (cut-and-sew construction) or because the buyer's price point cannot carry linking labor.

Seam cross-section. A folded panel edge plus a wrapping thread that encloses both raw edges. There is a visible seam allowance of 3-5mm on the inside of the garment. The wrapping thread runs perpendicular to the knit grain, not along it.

Visible quality signal. From the outside on a same-color seam at 7GG and below, often invisible under normal wear. At 12GG it shows as a slightly compressed ridge along the seam line. From the inside, unmistakably overlocked — folded edge, wrapping thread, and on darker yarns the contrast of overlock thread against the knit body is visible.

Gauge compatibility. Any gauge mechanically, but the visual signal grows worse as gauge gets finer. We do not recommend overlock on visible seams above 7GG for any product positioned as premium.

Cost. Typical industry range $0.10-$0.25 per garment. The cheapest seam option.

Specify here. Hidden seams only — armhole shaping on sleeves that will be covered by a lining, pocket bag joins, internal seams not seen by the customer. Entry-tier product where the price point cannot support linking labor and the inside will not be inspected.

Cost ranges shown are typical industry labor figures, not a Licheng quote — actual per-garment linking labor depends on seam length, gauge, yarn behavior and color, and is broken out as its own line in our quotations.

The most common mistake on a premium tech pack is to write "linking" once at the top of the construction sheet and leave the factory to apply it consistently. In practice, every sweater has multiple seams and they often warrant different methods. The clean way to write it:

• Neckband to body: call out by method explicitly — "full-needle hand linking, matching yarn."
• Shoulder seam: specify hand or machine linking, and add "on grain" so the factory does not substitute a shoulder tape sewn flat.
• Side seams and underarm: for fully fashioned product, specify linking. For cut-and-sew product, overlock is acceptable and the spec should say so.
• Cuffs and waistband: if the rib is knitted separately and attached, this is a linking seam — specify hand for premium, machine for mid-tier.
• Internal/hidden seams (pocket bags, lining attachment): overlock is appropriate.

On fine-gauge product positioned as premium menswear, our recommendation is hand linking on the four visible seams (neckband, two shoulders, optionally cuffs) and machine linking on the body. This is where the cost-to-signal ratio is best — the buyer sees and touches the seams that are hand-linked, and the body seams that are machine-linked are invisible to a normal inspection.

The sample is when the linking spec is honored or quietly downgraded. Three things to check:

First, request a labeled seam cross-section photograph of the neckband and shoulder during sampling. We provide this on request — a side-on macro shot of the seam after the sweater has been off the machine for 24 hours so the yarn has relaxed. Hand-linked seams photograph as a single chain along the knit grain; overlock photographs as a folded edge with wrapping thread.

Second, look at the inside of the neckband and the inside of the shoulder seam at the sample stage. The neckband should pass over the head without a thick ridge dragging against the cheek. The shoulder seam should lie flat against the trapezius with no ladder of wrapping thread visible.

Third, confirm in writing which method will be used in bulk. A common scenario is that a sample is hand-linked to win approval and bulk shifts to machine linking to hit the costed FOB. This is not necessarily wrong — machine linking at 7GG can be a perfectly reasonable production decision — but the buyer should know it is happening.

We run both hand and machine linkers in our Dongguan facility and route work to whichever method matches the spec. Our gauge range of 3GG-18GG covers everything from chunky cable knits (where 3GG hand linking is required) through to 14GG fine cotton polos (where 14GG hand linking is again the only option that produces a clean neckband). For 5GG-12GG product, which is the bulk of menswear sweater volume, both hand and machine linking are available and we will quote both lines if the buyer is comparing price points.

A common pattern we see with premium menswear designers is a tech pack that specifies hand linking on the neckband, both shoulders and cuffs, and machine linking on the body — that combination gives the inside-of-garment signal a premium buyer expects while keeping the FOB inside the $18-$28 band where most independent menswear lives. We also publish per-garment linking labor as a separate line in quotations so the buyer can see the cost of the spec and adjust before approving.

Linking is also one of the seams where AQL inspection findings cluster — open loops, dropped loops at the chain start, or substituted overlock on a hand-linked spec. We include linking specifically in our pre-shipment inspection sampling and call out any deviation from the approved spec before goods leave the factory.

The linking spec is one of the cheapest tech-pack changes a designer can make that genuinely moves a sweater between price tiers in the buyer's eye. Specifying hand linking on the visible seams of a premium product adds $1-2 of FOB labor and changes how the inside of the garment reads on first inspection. Specifying overlock on a sweater positioned as premium saves $1 and tells every buyer who turns the neckband the actual tier of the product. The method is the message — make sure the spec on the tech pack matches the message you want the seam to send.

---

If you're planning a real project around any of the points above, we'd be glad to take a quick look. Send a short brief and we'll come back within one business day with a practical direction, MOQ + lead time estimate, and a sample plan if it makes sense.

→ [Request a free quote](/request-quote) · [WhatsApp us](https://wa.me/8615170244792) · info@lcgarment.cn

• Common Sweater Quality Problems and How to Avoid Them
• Fully Fashioned vs Cut-and-Sew Knitwear
• How to Prepare a Sweater Tech Pack
• How to Read a Knitwear Quotation: FOB Price Breakdown for Buyers
• Sweater Quality Control Checklist for B2B Buyers

• Men's Periwinkle Blue Crew Neck Sweater Cotton Cashmere Blend Raglan Sleeve Spring Casual
• Men's Smart Grey Cable Knit Half Zip Sweater Merino Wool Neck
• Men's Light Blue Spring Summer Fine Knit Polo