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Category: Knitting

Everything about Knitting process of Knitted Fabrics.

  • How Circular Knitting Works: The Seamless Secret Behind Your Favourite Knits

    How Circular Knitting Works: The Seamless Secret Behind Your Favourite Knits

    Welcome back to Knitted Fabric.in! We’ve talked a lot about different types of knitted fabrics, their unique qualities, and how they’re finished. But have you ever wondered how many of your everyday knitwear items – from T-shirts and innerwear to socks and activewear – are made in a continuous, seamless tube? The answer lies in a fascinating process called circular knitting.

    Understanding the machinery behind the fabrics you love is incredibly insightful. Let’s pull back the curtain and explore the ingenious world of circular knitting.

    What is Circular Knitting?

    At its simplest, circular knitting is a method of knitting fabric in a continuous, tubular form, without any seams. Unlike flatbed knitting machines that produce flat pieces of fabric (which then need to be cut and sewn together), circular knitting machines create a seamless “tube” of fabric, much like knitting a long sock or a continuous sleeve on large, round needles.

    This technique is incredibly efficient and is the backbone of mass production for many knitted garments worldwide, including a significant portion of the knitwear produced in India.

    Circular Knitting Machine diagram

    The Core Components of a Circular Knitting Machine

    To understand how it works, let’s look at the main parts of a typical circular knitting machine:

    1. Needle Cylinder: This is the heart of the machine. It’s a rotating cylinder (or sometimes a rotating cam box with stationary needles) that holds a large number of knitting needles arranged in a perfect circle.
    2. Needles: These are specialized latch needles (most common) or sometimes compound needles. Each needle moves independently up and down within its slot in the cylinder.
    3. Cams: These are stationary metal tracks that guide the needles’ movement. As the needle cylinder rotates, the needles ride up and down these cam tracks, performing the actions required to form loops.
    4. Yarn Feeders: These are mechanisms that supply yarn to the needles as they knit. A circular knitting machine can have multiple yarn feeders, allowing several courses (rows) of knitting to be formed simultaneously, dramatically increasing production speed.
    5. Sinkers: Small metal elements located between the needles. They assist in holding down the fabric loops as new loops are formed, ensuring consistent stitch formation.
    6. Fabric Take-down: Located below the knitting area, this system (usually rollers) gently pulls the newly formed fabric tube downwards, preventing it from bunching up and maintaining proper tension.

    How the Magic Happens: The Step-by-Step Process

    The process of circular knitting is a continuous dance of needles and yarn, forming loops one after another:

    1. Yarn Feeding: Yarn from cones is fed through tension guides to the yarn feeders, which present the yarn to the needles.
    2. Needle Movement – Raising: As the needle cylinder rotates, the cam tracks guide individual needles upwards. The hook of each needle rises above the old loop it’s holding, and the latch (a small movable part on the needle) opens up.
    3. Yarn Laying: The yarn feeder lays a new segment of yarn into the open hook of the raised needle.
    4. Needle Movement – Drawing Down: The cam then guides the needle downwards. As it descends, the old loop (which was held by the latch) slides up the needle stem and pushes the latch closed.
    5. Loop Formation: The newly laid yarn is pulled through the old loop. As the needle continues its downward movement, the old loop casts off, and the new loop is held securely by the needle’s hook.
    6. Fabric Take-down: The newly formed row of interlocked loops (a “course”) adds to the fabric tube, which is then gently pulled downwards by the take-down rollers.

    This entire sequence happens at incredible speeds, with hundreds or even thousands of needles working simultaneously to produce a seamless fabric tube. Because there are multiple yarn feeders around the circumference, several rows of knitting are being formed at any given moment, leading to very high production rates.

    Types of Circular Knitting Machines

    Circular knitting machines come in various configurations, each suited for different types of fabrics:

    • Single Jersey Machines: These machines have one set of needles and produce single-sided fabrics like the classic T-shirt material. They are very fast but the fabrics can curl at the edges and may be prone to spirality.
    • Double Jersey Machines (e.g., Rib, Interlock, Pique): These machines have two sets of needles (one in the cylinder and one in a dial above it). This allows them to create more complex, often reversible, and more stable fabrics like rib knits, interlocks, and pique. They are slower than single jersey machines but produce fabrics with better dimensional stability and less curl.
    • Jacquard Machines: These are advanced circular knitting machines that can create intricate patterns and designs by individually selecting needles to knit or miss stitches, allowing for complex fabric aesthetics.
    • Fleece Machines: Designed to produce fabrics like fleece and French terry, often with special attachments for brushing or loop creation.

    Advantages of Circular Knitting

    The widespread use of circular knitting stems from its numerous benefits:

    • High Production Speed: Multiple yarn feeders and continuous operation allow for very fast fabric production, crucial for meeting market demands.
    • Seamless Construction: Produces fabrics in a tubular form, eliminating side seams in garments like T-shirts, vests, and socks, which enhances comfort and reduces manufacturing steps (no need to sew side seams).
    • Cost-Effective: High output combined with reduced sewing needs can lead to lower production costs per metre or per garment.
    • Stretch and Comfort: The inherent nature of knitting creates stretchy, comfortable fabrics, which is further enhanced by the relaxed tubular process.
    • Versatility: Capable of producing a wide range of fabric types, weights, and structures (jersey, rib, interlock, fleece, etc.).

    The Role of Circular Knitting in Your Wardrobe

    Next time you pull on your favourite T-shirt, a comfy pair of track pants, or a seamless inner vest, take a moment to appreciate the unsung hero: the circular knitting machine. Its ability to rapidly produce high-quality, comfortable, and seamlessly structured fabrics is what makes so many of our everyday garments possible.

    Understanding these processes not only deepens your appreciation for textiles but also helps you make informed choices about the quality knitted fabrics you bring into your life.

    Stay curious and keep knitting with Knitted Fabric.in!

  • What are Knitted Fabrics – Understand in Detail

    What are Knitted Fabrics – Understand in Detail

    At its core, a knitted fabric is a textile structure created by interlocking loops of yarn. Unlike woven fabrics, where two sets of threads (warp and weft) cross each other at right angles, knitting uses a single yarn (or multiple yarns) to form a series of connected loops. This unique loop structure is what gives knitted fabrics their distinctive properties.

    The Knitting Process: Forming Loops

    The fundamental unit of a knitted fabric is the loop, also called a stitch. The process involves forming new loops and pulling them through existing loops. This can be done manually with knitting needles (hand knitting) or, more commonly, on sophisticated knitting machines.

    Imagine a single yarn. In knitting, this yarn is bent into a loop. Then, another section of the same yarn (or a different yarn) is pulled through that first loop, forming a new loop. This process repeats, with each new loop interlocking with the previous one, creating a continuous fabric.

    • Course: A row of loops formed horizontally across the fabric.
    • Wale: A column of loops formed vertically along the length of the fabric.

    Key Characteristics of Knitted Fabrics

    The looped structure of knitted fabrics gives them several important characteristics:

    1. Elasticity and Stretch: This is the most defining feature. Because the yarn follows a meandering, looped path, knitted fabrics can stretch significantly in various directions (often in all four directions: lengthwise, crosswise, and on the bias). This makes them incredibly comfortable and form-fitting, allowing for freedom of movement.
    2. Drape: Knitted fabrics tend to drape beautifully, conforming to the body’s contours or falling softly. This is a result of their inherent flexibility.
    3. Softness: The looped construction generally makes knitted fabrics feel softer and less rigid than woven fabrics.
    4. Breathability: The open nature of the loops allows for good airflow, making many knitted fabrics breathable and comfortable to wear.
    5. Wrinkle Resistance: Knitted fabrics are generally less prone to wrinkling compared to woven fabrics because the loops can easily flex and return to their original shape.
    6. Insulation (Warmth): The spaces within the looped structure can trap air, providing good insulation and warmth, which is why knitted fabrics are popular for sweaters and winter wear.
    7. Run/Laddering Potential: A notable disadvantage of some knitted fabrics (especially weft knits) is their tendency to “run” or “ladder” if a loop is broken, as the continuous yarn can unravel.

    Types of Knitted Fabrics

    Knitted fabrics are broadly classified into two main categories based on how the loops are formed:

    1. Circular Knitting

    • How it works: In circular knitting, loops are formed horizontally across the fabric using a single yarn (or multiple yarns at different feeders). Think of hand knitting – you’re essentially doing circular or weft knitting.
    A functional circular knitting machine
    A functional Circular Knitting Machine
    • Characteristics:
      • Highly stretchy and elastic.
      • Softer and more pliable.
      • Can unravel easily if a yarn breaks (prone to runs).
      • Can be made on flat or circular knitting machines.
    • Common Types of Weft Knits:
      • Jersey Knit (Plain Knit/Single Knit): The most common type. It has a distinct “V” pattern on the front (technical face) and horizontal loops (purl stitches) on the back (technical back). It curls easily at the edges when cut. Used for T-shirts, dresses, underwear.
      • Rib Knit: Characterized by visible vertical ribs on both sides, created by alternating knit and purl stitches in the same row. Offers excellent crosswise stretch and recovery. Used for cuffs, collars, waistbands, and fitted garments.
      • Interlock Knit: A type of double knit that looks like two jersey fabrics knitted together. Both sides appear identical with a smooth, lengthwise ribbed texture. It’s thicker, more stable, and less stretchy than single jersey, with good shape retention. Used for polo shirts, dresses, and activewear.
      • Purl Knit: Has a textured, bumpy surface on both sides, making it reversible. It has good lengthwise and crosswise stretch but is less common due to slower production. Often used for sweaters and scarves.
      • French Terry: A knit fabric with loops on one side (usually the inside for absorbency) and a smooth surface on the other. Popular for sweatshirts and casual wear.
      • Fleece: A brushed knit fabric (often originally jersey or French terry) that has a soft, fuzzy pile on one or both sides for warmth.

    2. Warp Knitting

    • How it works: In warp knitting, multiple yarns are used, with each yarn having its own needle. Loops are formed vertically along the length of the fabric in a zigzag or diagonal pattern.
    A Warp Knitting Machine
    A Warp Knitting Machine
    • Characteristics:
      • Less stretchy than circular knits, but still elastic.
      • More stable and run-resistant (less likely to unravel if a yarn breaks).
      • Often produces denser fabrics.
      • Generally produced at higher speeds on specialized machines.
    • Common Types of Warp Knits:
      • Tricot: A very common warp knit with lengthwise ribs on the front and crosswise ribs on the back. It’s smooth, lightweight, and durable. Used for lingerie, swimwear, athletic wear linings, and automotive interiors.
      • Raschel: This type of warp knit can produce a wide range of fabrics, from fine laces and mesh to heavy carpets and industrial textiles. It often features openwork designs and intricate patterns.
      • Milanese Knit: Known for its fine diagonal rib pattern on the face and a diagonal structure on the reverse. It’s lightweight, soft, and run-resistant, often used for gloves and apparel where a smooth, flowing drape is desired.

    Applications of Knitted Fabrics

    Due to their versatility and unique properties, knitted fabrics are used in a vast array of products:

    • Apparel: T-shirts, sweaters, dresses, leggings, activewear, hosiery, socks, underwear, swimwear, hats, scarves.
    • Home Textiles: Blankets, throws, upholstery, curtains (some types).
    • Technical Textiles: Medical bandages, protective gear, automotive textiles, geotextiles.

    Understanding the differences between knitted and woven fabrics, and the various types of knits, is crucial for anyone involved in textile production, design, or even just choosing quality fabrics for personal use.