Boorim Textile SolutionsCircular knitting forms fabric on needles arranged around a cylinder. As the needle bed rotates, yarn is fed continuously and loops are created in a spiral path. The result is usually a tube of fabric rather than a flat sheet.
This makes circular knitting especially useful for products where speed, elasticity, comfort, and reduced sewing are important. It is widely used for jersey fabric, rib fabric, socks, hosiery, underwear, T-shirts, sportswear, seamless garments, cuffs, collars, and technical textiles.
Knowledge pill: Circular knitting is a high-speed loop-forming process. Its main advantage is continuous production, but the final quality depends on yarn choice, machine gauge, loop setting, stitch design, and finishing control.
What circular knitting does
Circular knitting creates a fabric tube by forming new loops around the circumference of the machine. Depending on the machine and product, that tube may later be cut open into fabric rolls, cut and sewn into garments, or kept as a shaped tube for socks, hosiery, cuffs, sleeves, or seamless items.
| Feature | Practical meaning |
|---|---|
| Circular needle bed | Needles are arranged around a cylinder or cylinder-and-dial system |
| Continuous courses | Loops are formed row after row as the machine rotates |
| Tubular output | Fabric leaves the machine as a tube, sock, pouch, sleeve, or seamless body |
| High productivity | Many machines run quickly and can use multiple yarn feeds |
| Flexible patterning | Needle selection, colour feeds, tuck, float, and transfer effects can change the fabric |
The technology can make simple commodity jersey as well as complex engineered structures. The important point is matching the machine to the required fabric, not simply choosing the fastest machine.
The circular-knitting loop cycle
A basic circular-knitting cycle follows the same logic as weft knitting:
- Old loop is held: The needle holds the loop from the previous course.
- Needle rises: The old loop moves down the needle stem.
- Yarn is fed: The yarn guide places new yarn into the needle hook.
- Needle descends: The hook draws the new yarn through the old loop.
- Old loop casts off: The previous loop is released into the fabric.
- New loop is retained: The fresh loop stays on the needle for the next course.
On a circular machine, this sequence happens repeatedly around the cylinder. Multiple yarn feeds can increase production speed or enable stripes, patterning, plating, and functional yarn placement.
Machine types and what they are used for
Single jersey circular machines
Single jersey machines use one needle bed. They are fast and efficient for lightweight to medium knitted fabrics. The fabric has a clear technical face and a different technical back.
Common uses include T-shirts, underwear, linings, sportswear, casualwear, and many printed or dyed knit fabrics.
Rib and interlock machines
Rib and interlock structures are made with two needle systems, often using a cylinder and dial. Rib fabrics stretch strongly across the width and recover well. Interlock fabrics are generally smoother, thicker, and more dimensionally stable than single jersey.
These machines are used for collars, cuffs, waistbands, underwear, babywear, polo fabric, casualwear, and higher-stability knit fabrics.
Sock and hosiery machines
Small-diameter circular machines can shape socks, tights, stockings, and similar tubular products. Depending on the setup, machines may create heel pockets, toe areas, ribs, terry cushioning, mesh zones, or jacquard patterns.
The benefit is that the product can be formed close to its final shape, reducing cutting and sewing compared with flat fabric production.
Seamless garment machines
Seamless circular machines can knit body-shaped tubes with zones of different stretch, openness, texture, or compression. This supports products such as activewear, underwear, base layers, compression garments, and body-mapped performance apparel.
Seamless production can reduce sewing operations, but it requires careful design, suitable yarns, and precise machine programming.
Common circular-knitted fabrics
| Fabric type | Typical characteristics | Common uses |
|---|---|---|
| Plain jersey | Light, flexible, efficient, may curl at edges | T-shirts, underwear, casualwear |
| Rib | Strong crosswise stretch and recovery | Cuffs, collars, trims, waistbands |
| Interlock | Smoother, thicker, more stable than jersey | Polo shirts, babywear, casualwear |
| Terry loop | Loops on one side add bulk and absorbency | Socks, sweatshirts, towels, comfort fabrics |
| Pique or structured knit | Raised or textured surface | Polo shirts and textured apparel |
| Openwork or mesh | Controlled openings for air flow | Sportswear, ventilation zones, linings |
| Jacquard knit | Needle selection creates pattern or graphics | Patterned apparel, branding, decorative panels |
These names describe useful categories, but actual performance still depends on yarn, gauge, stitch length, finishing, and testing.
Design levers that control performance
Circular-knitted fabric is highly adjustable. Designers and buyers should understand the main levers:
- Machine gauge: Fine gauge creates smoother, lighter fabric; coarse gauge creates heavier or more textured fabric.
- Diameter: Machine diameter affects tube width and production suitability.
- Yarn feed count: More feeders can increase speed or enable stripes and patterning.
- Stitch length: Longer loops usually increase softness and stretch but can reduce stability.
- Yarn type: Cotton, polyester, nylon, wool, viscose, elastane, textured yarns, and blended yarns all behave differently.
- Elastane use: Elastane improves stretch and recovery, but can complicate heat setting, sewing, dyeing, and recycling.
- Finishing route: Dyeing, washing, compacting, brushing, steaming, heat setting, and calendaring can strongly change shrinkage, touch, and appearance.
The same construction can feel very different after finishing. That is why sampling should include the intended finishing process, not just greige fabric evaluation.
Quality control in circular knitting
Circular knitting can produce fabric quickly, so small problems can become large quantities of defective fabric if they are not caught early.
Machine and yarn faults
- Broken yarn or dropped stitches
- Needle lines or vertical streaks
- Uneven loop length
- Oil marks or contamination
- Yarn tension variation
Dimensional faults
- Spirality or twisting after washing
- Excessive shrinkage
- Width variation
- Poor recovery after stretch
- Edge curling in single jersey
Appearance faults
- Barre or shade variation
- Pattern misalignment
- Uneven texture between face and back
- Pilling or surface fuzz
- Snags, pulls, and holes
Useful checks include GSM, width, shrinkage, spirality, stretch and recovery, pilling, colourfastness, seam performance, and garment fit after washing.
Sourcing checklist for buyers
Before ordering circular-knitted fabric or products, clarify:
- Is the product fabric roll, sock, hosiery, seamless garment, cuff, collar, or trim?
- What composition and yarn type are required?
- What GSM, width, gauge, and shrinkage limits are acceptable?
- Is elastane needed, and what recovery is expected?
- Should the fabric be jersey, rib, interlock, terry, mesh, jacquard, or another structure?
- What finishing is required: dyed, printed, brushed, compacted, heat-set, or anti-pilling?
- What tests are required for the end use and market?
- Is the priority price, speed, comfort, durability, dimensional stability, or appearance?
Clear answers prevent a common sourcing mistake: approving fabric that looks good before washing but fails after finishing, sewing, or consumer care.
Sustainability and cost considerations
Circular knitting is efficient because it can produce long continuous tubes or shaped products with relatively little cutting waste. Seamless and sock machines can reduce sewing steps, while high-speed jersey machines can produce large volumes at low unit cost.
The environmental profile still depends on fibre selection, dyeing, finishing, defect rate, energy use, and end-of-life options. Mono-material fabrics may be easier to recycle, while blends with elastane often provide better stretch and comfort but are harder to recycle.
Cost is shaped by yarn price, machine gauge, diameter, pattern complexity, production speed, finishing, quality testing, and waste rate. Simple jersey is usually cost-efficient. Jacquard, mesh, terry, seamless shaping, plating, and elastane-rich products require more development and control.
Fast recall
Circular knitting forms loops around a cylinder to create tubes, rolls, socks, hosiery, trims, and seamless products. Machine type, gauge, yarn, stitch length, patterning, and finishing decide the final performance.