Plain Single Jersey Fabrics Overview
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Questions and Answers

What is the primary function of the sinker during the knock-over process?

  • To adjust stitch length
  • To trap the new yarn (correct)
  • To withdraw the old loop
  • To hold down the new loop

    • Which cam is responsible for altering the stitch length in the needle cam race?

  • Clearing cam (1)
  • Return cam (5)
  • Stitch cam (2) (correct)
  • Upthrow cam (3)

    • What characterizes rib fabrics in knitting technology?

  • They consist of vertical rows of loops meshed in the same direction.
  • They are made with lightweight filament yarn.
  • They are always single jersey knitted fabrics.
  • They have vertical rows of loops meshed in opposite directions. (correct)

    • What is the impact of using lightweight filament yarn in jersey-knit construction?

    <p>They yield smoother surfaces but increase run susceptibility.</p> Signup and view all the answers

    What is the main distinction between plain single jersey knits and rib fabrics?

    <p>Rib fabrics display vertical rows of loops in opposite directions.</p> Signup and view all the answers

    Which of the following is NOT a type of variation for plain single jersey knits?

    <p>Denim</p> Signup and view all the answers

    What defines a plain single jersey fabric?

    <p>It has one side of face stitches and the other of back stitches.</p> Signup and view all the answers

    Which characteristic of plain single jersey fabrics contributes to their economical production?

    <p>Simplicity of stitches and machine.</p> Signup and view all the answers

    What does the term 'knock-over' refer to in the knitting process?

    <p>The descent of the needle to remove the old loop</p> Signup and view all the answers

    What happens during the holding-down process in knitting?

    <p>The sinker holds down the new loop while the needle rises.</p> Signup and view all the answers

    What happens to a plain single jersey fabric when a stitch is broken?

    <p>The wale will disintegrate, causing stitches to undo.</p> Signup and view all the answers

    What is the typical stretching behavior of plain single jersey fabrics?

    <p>Stretch is predominantly crosswise.</p> Signup and view all the answers

    What is a consequence of cutting plain single jersey fabric?

    <p>It curls.</p> Signup and view all the answers

    How does stitch length affect the properties of plain single jersey fabrics?

    <p>It changes rigidity, air permeability, weight, and bursting strength.</p> Signup and view all the answers

    Which of the following features is NOT characteristic of plain single jersey fabrics?

    <p>Stability when cut.</p> Signup and view all the answers

    What is the appearance of the technical face of single jersey fabric?

    <p>It can be recognized by smooth texture and V's in the wales.</p> Signup and view all the answers

    What structure is rib fabric also known as?

    <p>Double jersey structure</p> Signup and view all the answers

    What is the simplest form of rib fabric?

    <p>1 x 1 rib</p> Signup and view all the answers

    Which characteristic of rib fabrics prevents curling at the edges?

    <p>Balanced structure</p> Signup and view all the answers

    What machines are typically used to produce rib knits?

    <p>Circular and V-bed machines</p> Signup and view all the answers

    How does the width of relaxed 1 x 1 rib compare to plain fabric?

    <p>It is wider than plain fabric.</p> Signup and view all the answers

    What happens during the production of rib fabrics that distinguishes it from plain fabrics?

    <p>Two sets of needles are utilized.</p> Signup and view all the answers

    Why is rib fabric considered more expensive to produce than plain fabric?

    <p>It involves more complex knitting techniques.</p> Signup and view all the answers

    Which of the following statements about the rib structure is accurate?

    <p>Rib cannot unravel from the end knitted last.</p> Signup and view all the answers

    What happens to jersey-knit materials due to the needle configuration in the machines?

    <p>They curl at the edges and are unbalanced.</p> Signup and view all the answers

    What can help correct curling issues in jersey-knit fabrics during production?

    <p>Heat setting the fabric during finishing.</p> Signup and view all the answers

    Which machines are typically used to produce single jersey fabrics?

    <p>Flat and circular knitting machines.</p> Signup and view all the answers

    Which step in the knitting process involves freeing the old loop to allow for new yarn to be presented?

    <p>Yarn feeding.</p> Signup and view all the answers

    In the production of plain single jersey fabrics, what role does the sinker serve during the knitting action?

    <p>It holds down the old loop while the needle rises.</p> Signup and view all the answers

    What is one consequence of reducing or increasing the stitch length in fabric production?

    <p>The fabric may look thicker or flimsy.</p> Signup and view all the answers

    What equipment is used to guide yarn from cones to the knitting machine?

    <p>Tensioners and guide eyes.</p> Signup and view all the answers

    Which characteristic of jersey-knit fabrics is affected by their construction method?

    <p>They curl at both ends and sides.</p> Signup and view all the answers

    What is the primary advantage of purl-knit machines compared to jersey knit machines?

    <p>Greater versatility in fabric types</p> Signup and view all the answers

    Which type of knitting machine generally has the lowest productivity?

    <p>Purl-knit machines</p> Signup and view all the answers

    What unique design effects can purl-knit machines achieve?

    <p>Custom designs across all fabric types</p> Signup and view all the answers

    Which position indicates that the needle is about to be transferred to the back bed?

    <p>Position 2</p> Signup and view all the answers

    How does the engagement of the front bed slider with the needle hook affect the knitting process?

    <p>It facilitates the transfer of control to the back bed slider</p> Signup and view all the answers

    What occurs during the knocking-over process of the dial needle?

    <p>New loops are drawn through old loops.</p> Signup and view all the answers

    What is the result of the lowest production rate of purl knit fabrics?

    <p>Higher cost per pound of fabric produced</p> Signup and view all the answers

    Which of the following accurately describes the yarn feeding process in purl knitting?

    <p>Yarn is fed differently based on the position of the needle</p> Signup and view all the answers

    What characterizes synchronized timing in knitting?

    <p>Both needles knock over together to produce loops of equal size.</p> Signup and view all the answers

    What is the primary effect of delayed timing in knitting?

    <p>It produces tighter fabric by robbing back some yarn.</p> Signup and view all the answers

    How do the productivity levels of rib-knit machines compare to those of purl and jersey machines?

    <p>Their productivity is higher than purl but lower than jersey</p> Signup and view all the answers

    What is the consequence of using delayed timing in the knitting process?

    <p>The fabric produced is heavier and more rigid.</p> Signup and view all the answers

    Which of the following is NOT a variation of rib knits?

    <p>Purl Rib</p> Signup and view all the answers

    In what application are rib knits commonly used?

    <p>In collars and cuffs of garments.</p> Signup and view all the answers

    What is the original spelling of 'Purl' in reference to purl fabrics?

    <p>Purl was originally spelled as 'pearl'.</p> Signup and view all the answers

    What is the term used for the relationship between the loop forming positions of the dial and cylinder needles?

    <p>Needle Timing</p> Signup and view all the answers

    Study Notes

    Plain Single Jersey Fabrics

    • Single jersey fabric has one side of face stitches and the opposite side of back stitches.
    • Frequently referred to as a single jersey fabric or a plain knitted fabric
    • Simplest weft-knitted structure, produced with one set of needles.
    • Basic structure for hosiery and fully-fashioned knitwear.
    • Easily recognized by its distinct face (smooth) and back (textured/mottled) surfaces.
    • Face has knit stitches, smooth texture.
    • Back has purl stitches, textured and mottled appearance.

    Characteristics of Plain Single Jersey Fabrics

    • Economical to produce with high covering power.
    • Recoverable up to 40% in width after stretching.
    • High production rate; low cost due to simple stitch and machine.
    • Produced on both flat and circular machines.
    • Stretch both crosswise and lengthwise, more crosswise
    • Fabric can be unravelled from either end; broken stitch leads to disintegration/laddering.
    • Unstable, curls when cut.

    Production of Plain Single Jersey Fabrics

    • Fabric produced on flat or circular machines using one set of needles (called jersey machines, plain-knit machines).
    • Circular machines feature a latch needle cylinder and sinker ring.
    • Yarn supplied from cones, positioned on an overhead bobbin stand or a free-standing creel.
    • Fabric, in tubular form, drawn from the needle cylinder via tension rollers, wound onto a fabric-batching roller on the winding frame.

    Knitting Action of Plain Single Jersey Fabrics

    • Sequence of steps for knitting a course:
    1. Tucking: Sinker holds old loop, needle rises.
    2. Clearing: Sinker still forward, clears old loop.
    3. Yarn feeding: Sinker moves back, presents yarn.
    4. Knock-over: Sinker fully back, needle descends to knock loop over.

    Variations of Plain Single Jersey Knits

    • Fleece, Intarsia, jacquard knits, knitted terry, knitted velour, lisle, plaited, silver-pile knits.

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    Weft Knitted Fabrics PDF

    Description

    This quiz explores the characteristics and production of plain single jersey fabrics. It covers the structure, production methods, and unique properties of this basic knitted fabric. Ideal for students and professionals in textile design and apparel manufacturing.

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