Warp Knitting Basics

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Questions and Answers

What is primarily formed by wrapping the yarn around the needle in warp knitting?

  • Overlap (correct)
  • Underlap
  • Pillar stitch
  • Course

Which type of bar is used in warp knitting when only underlaps are created?

  • Loop bar
  • Inlay bar (correct)
  • Shog bar
  • Guide bar

When overlap and underlap move in the same direction, what type of fabric is formed?

  • Open lap (correct)
  • Pillar structure
  • Closed lap
  • Inlay fabric

What is the term used for the loops created in warp knitting?

<p>Laps (B)</p> Signup and view all the answers

What happens when only underlaps are used in a multi-guide structure?

<p>Only tie-in occurs (C)</p> Signup and view all the answers

Which stitch is commonly used with other lapping movements in knitting?

<p>Pillar stitch (D)</p> Signup and view all the answers

In warp knitting, what is created by the combination of overlap and underlap moving in opposite directions?

<p>Closed lap fabric (D)</p> Signup and view all the answers

What is the initial structure of a warp knitted fabric composed of?

<p>Stitches and laps (A)</p> Signup and view all the answers

What is the term for the length of yarn linking together the stitches in warp knitted fabrics?

<p>Underlap (C)</p> Signup and view all the answers

Which characteristic is NOT associated with warp knitted fabrics?

<p>Highly stretchable (A)</p> Signup and view all the answers

What fabric structure is created when there is a lack of lateral movement in the guide bars for a few courses?

<p>Warp float (A)</p> Signup and view all the answers

Which of the following characteristics describes the drapability of warp knitted fabrics?

<p>Good drapability (A)</p> Signup and view all the answers

What is produced when closed lap formation occurs in the stitching direction?

<p>Warp knit structure (A)</p> Signup and view all the answers

Which statement accurately describes the versatility of warp knitted fabrics?

<p>They are versatile in pattern effects with yarn. (D)</p> Signup and view all the answers

What effect does the closed lap formation have on the yarns in warp knitted fabrics?

<p>Linked closely without gaps (D)</p> Signup and view all the answers

What is the primary role of guide bar movement in the warp knitted fabric structure?

<p>To maintain the straightness of the warps (C)</p> Signup and view all the answers

What defines the process of warp knitting?

<p>Each knitting needle gets at least one separate yarn. (B)</p> Signup and view all the answers

Which structure is responsible for forming patterns in warp knitted fabrics?

<p>Underlaps (D)</p> Signup and view all the answers

How do the diagonal lines of yarns (underlaps) appear on the back side of warp knitted fabric?

<p>They zigzag in a right and left manner. (D)</p> Signup and view all the answers

What characterizes the technical face of warp knitted fabric?

<p>Clearly defined knit stitches running vertically. (C)</p> Signup and view all the answers

Which feature distinguishes warp knitted fabrics from weft knitted materials?

<p>The recognition of laps in the fabric. (D)</p> Signup and view all the answers

What role do overlaps play in warp knitting?

<p>They feed yarn to a needle in each course. (D)</p> Signup and view all the answers

What does the term 'wales' refer to in the context of warp knitting?

<p>The vertical line of loops in the fabric. (A)</p> Signup and view all the answers

Which of the following statements about warp knitting is incorrect?

<p>The face and back of the fabric have a similar appearance. (B)</p> Signup and view all the answers

What is the effect of only utilizing underlaps in a multi-guide warp knitting structure?

<p>It creates an inlay bar and inlay yarn that do not form loops. (A)</p> Signup and view all the answers

What defines the structure of a warp knitted fabric?

<p>Yarn is wrapped around the needle and drawn through previous loops. (D)</p> Signup and view all the answers

When both overlap and underlap are used together, which type of fabric can be created when they move in the same direction?

<p>An open lap fabric. (A)</p> Signup and view all the answers

What happens when overlap and underlap move in opposite directions in warp knitting?

<p>A closed lap fabric is formed. (D)</p> Signup and view all the answers

In the context of warp knitting, what is the primary function of overlaps?

<p>To form the structural loops in the fabric. (D)</p> Signup and view all the answers

What is a common characteristic of the yarn laps referred to in warp knitting?

<p>They represent the wrapping structure around loops made by guides. (C)</p> Signup and view all the answers

What type of stitch is known as a pillar stitch in warp knitting?

<p>A stitch that requires additional lapping movements to create fabric. (C)</p> Signup and view all the answers

How does the shape and direction of guides affect the formation of warp knitted fabrics?

<p>They determine the type and strength of the stitches formed. (C)</p> Signup and view all the answers

What is a key characteristic of the face of warp knitted fabric?

<p>It generally has vertically running knit stitches. (A)</p> Signup and view all the answers

How do underlaps contribute to the design possibilities in warp knitting?

<p>They influence the extent and direction of pattern effects. (B)</p> Signup and view all the answers

Which statement accurately represents the yarn supply process in warp knitting?

<p>Every knitting needle is supplied with at least one separate yarn. (C)</p> Signup and view all the answers

What distinguishes the back side of warp knitted fabric from its face?

<p>Diagonal lines of yarns run in a zigzag manner. (A)</p> Signup and view all the answers

What is the primary function of overlaps in warp knitting?

<p>To link yarns and form loops more evenly. (D)</p> Signup and view all the answers

In what way do overlaps and underlaps in warp knitting affect fabric appearance?

<p>They jointly create texture patterns and varying visual effects. (A)</p> Signup and view all the answers

What is the significance of recognizing laps in a knitted fabric?

<p>It is the most important factor for distinguishing warp knits. (C)</p> Signup and view all the answers

What role does the guide bar play in warp knitted fabric formation?

<p>It only feeds yarn to the same needle throughout a course. (D)</p> Signup and view all the answers

What is primarily produced by lateral movement of yarns across the needles in warp knitted fabrics?

<p>Underlap (D)</p> Signup and view all the answers

Which of the following correctly describes a characteristic of warp knitted fabrics?

<p>Rigid to elastic (B)</p> Signup and view all the answers

What structure is formed when there is neither overlap nor underlap in a warp knitted fabric?

<p>Warp float (A)</p> Signup and view all the answers

What is the role of guide bars in the context of warp knitting?

<p>To hide color warps at the back (B)</p> Signup and view all the answers

Which statement best explains the concept of closed lap formation in stitching direction?

<p>It connects stitches without leaving gaps. (B)</p> Signup and view all the answers

Which of the following is NOT a characteristic of warp knitted fabrics?

<p>Highly stretchable in all directions (C)</p> Signup and view all the answers

What is the effect of using overlapping and underlapping in warp knitting?

<p>It provides texture and pattern variation. (D)</p> Signup and view all the answers

In the context of warp knitting, what does underlapping primarily contribute to?

<p>Stability of fabric structure (B)</p> Signup and view all the answers

Flashcards

Warp Knitting

A stitch forming process where yarns run parallel to fabric selvedge.

Wales

Vertical lines of loops in a warp knitted fabric.

Courses

Horizontal lines of loops in warp knitted fabric.

Overlap

The loop portion seen in warp knitted fabrics.

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Underlap

Diagonal lines of yarns in warp knit fabric's backside.

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Warp Knit Fabric Distinction

Easily identified by different appearances on the front and back (face and back).

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Overlap Knitting (Point diagram)

Guide bar feeds yarn to same needle in each course (row).

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Technical Face/Back

Different appearances on the front and back side of a warp knit fabric.

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Warp Knitted Laps

Loops in warp knitting; warp yarns wrap around needles to create loops.

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Inlay Bar/Yarn

Guide bar with underlaps only. Warp yarns don't form loops.

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Open Lap Fabric

Fabric formed when overlap and underlap move in the same direction.

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Closed Lap Fabric

Fabric formed when overlap and underlap move in opposite directions.

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Pillar Stitch

A stitch, not a fabric, often used in conjunction with other movements.

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Subsequent courses/wales

Stitches in warp knitting; subsequent rows or paths of yarn.

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Closed lap

A warp knitting structure where yarns move in a way that produces a closed or overlapping stitch.

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Warp float

A warp knitting technique where yarns move without crossing other yarns.

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Guide bar movement

Lateral movement of yarns controlled by guide bars in warp knitting.

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Warp knitted fabric characteristics

Warp knitted fabrics are versatile, rigid-to-elastic, non-raveling, and have good air/water permeability, crease/dimensional stability, and strength.

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What is a lap in warp knitting?

A loop formed by a warp yarn wrapping around a needle.

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What are the two main components of a warp knitted structure?

The stitch itself, formed by yarn wrapping around a needle, and the movement of the yarn to create the loop.

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What is an overlap in warp knitting?

The wrapping of the yarn around a needle to form a loop.

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What is an underlap in warp knitting?

A diagonal movement of the yarn on the back side of the fabric.

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What is a pillar stitch?

A stitch used in warp knitting that acts as a foundation for other stitches.

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What happens when overlap and underlap move in the same direction?

They form an open lap fabric.

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What happens when overlap and underlap move in opposite directions?

They form a closed lap fabric.

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What is an inlay bar?

A guide bar that only creates underlaps, so the warp yarns don't form loops.

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Technical Face vs. Back

Warp knit fabrics have distinct appearances on the front (face) and back (backside) due to the underlaps.

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Open Lap vs. Closed Lap

Two types of warp knit structures based on how overlap and underlap move. Open: same direction, Closed - opposite directions.

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Overlap Only

A warp knitting technique where the guide bar only feeds yarn to the same needle in each course (row), creating overlapping loops.

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Inlay Bar

A guide bar in warp knitting that only creates underlaps, so the warp yarns don't form loops.

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What is the purpose of a guide bar in warp knitting?

Guide bars control the lateral movement of yarns across the needles, determining the overlap, underlap, and overall structure of the warp knitted fabric.

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Study Notes

Warp Knitting Basics

  • Warp knitting is a stitch-forming process where yarns are supplied parallel to fabric selvedge (wales).
  • Every knitting needle has at least one yarn.
  • Yarns are deflected laterally between needles to connect stitches.
  • Knitted loops are formed by drawing new yarn loops through existing loops.
  • Warp knit fabric structure has different appearances on the face and back.
  • Face has clearly defined knit stitches, generally vertical, slightly angled.
  • Back has diagonal yarn lines (underlaps) that run in a zigzag pattern.
  • Underlaps are crucial for pattern effects and easily identify warp knits.

Warp Knitted Fabric Structure

  • Figure 14.1 shows warp knit fabric structure (face).
  • Figure 14.2 shows warp knit fabric structure (back).
  • Figure 14.3 shows overlap and underlap in warp knitted fabric.
  • Figure 14.4 illustrates warp knitted fabric formation.
  • Overlaps are the yarn portions wrapping around a needle.
  • Underlaps are the yarn portions linking stitches in a lateral movement.

Warp Knitted Laps

  • Loops are called 'laps' due to yarn wrapping around needles.
  • Warp knit structure has two parts: stitch formation (yarn wrapping) & linking stitches (underlap).
  • Overlap is where yarn wraps around needle.
  • Underlap connects stitches, yarn movement is lateral.
  • Different combinations of overlap and underlap influence fabric structure.

Overlap, Underlap, and Fabric Types

  • Overlap only: Needle knits a chain of stitches (e.g., pillar stitch).
  • Underlap only: Cannot form a fabric, often used alongside other lapping movements.
  • Overlap with underlap: Produce open or closed lap fabrics depending on movement direction.
  • Fabric can be rigid to elastic.
  • Easily adaptable to pattern effects with multiple yarns.
  • Resistant to tearing.
  • Good air permeability.
  • Good crease resistance.
  • Excellent dimensional stability and strength.
  • Excellent for a variety of design possibilities.

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