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Questions and Answers
What characterizes a closed lap in knitting?
What characterizes a closed lap in knitting?
Which statement is true regarding open laps?
Which statement is true regarding open laps?
What is a disadvantage of double-needle overlaps?
What is a disadvantage of double-needle overlaps?
What is a characteristic of single face fabrics?
What is a characteristic of single face fabrics?
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How many basic lapping variations are present in knitting?
How many basic lapping variations are present in knitting?
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Which fabric structure is a result of using a single needle bar?
Which fabric structure is a result of using a single needle bar?
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What does the underlap between double overlaps resemble?
What does the underlap between double overlaps resemble?
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What is the primary result of using closed laps in terms of fabric properties?
What is the primary result of using closed laps in terms of fabric properties?
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What results from the execution of only overlaps without any underlaps?
What results from the execution of only overlaps without any underlaps?
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Which variation consists of neither overlaps nor underlaps?
Which variation consists of neither overlaps nor underlaps?
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In a 1 & 1 lap (Tricot lap), what is the primary function of the underlaps?
In a 1 & 1 lap (Tricot lap), what is the primary function of the underlaps?
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What is a characteristic feature of a pillar lap stitch construction?
What is a characteristic feature of a pillar lap stitch construction?
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What distinguishes the atlas construction from other stitch variations?
What distinguishes the atlas construction from other stitch variations?
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What term is used to refer to the loops in warp knitting?
What term is used to refer to the loops in warp knitting?
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What are the two main components of a basic warp knit structure?
What are the two main components of a basic warp knit structure?
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How does a longer underlap affect the lateral stability of the fabric?
How does a longer underlap affect the lateral stability of the fabric?
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What happens to the fabric weight when knitting with a longer underlap?
What happens to the fabric weight when knitting with a longer underlap?
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What does the run-in refer to in the context of warp knitting?
What does the run-in refer to in the context of warp knitting?
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How do the size of stitches relate to the run-in duration?
How do the size of stitches relate to the run-in duration?
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What character does the stitch formed have based on the underlap and overlap motions?
What character does the stitch formed have based on the underlap and overlap motions?
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What defines the run-in ratio in warp knitting?
What defines the run-in ratio in warp knitting?
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Study Notes
Knitting Technology: Warp Knit Structures
- Warp knitting involves loops ('laps') formed as warp yarns wrap around needles.
- Loops can be open or closed, depending on overlaps.
- A warp knitted structure is composed of two parts: the stitch (formed by wrapping yarn around a needle and pulling it through the previous loop) represented as an 'overlap'; and the yarn linking the stitches, called the 'underlap'.
- Underlap length is measured in needle spaces.
- A longer underlap results in greater lateral fabric stability and fabric weight. Conversely, a shorter underlap leads to reduced width-wise stability/strength, but increases length-wise stability.
- Yarn consumption during 480 knitted courses is called 'run-in'. A 'rack' is a cycle of 480 knitted courses. Run-in represents yarn consumption for one rack.
- For a given machine and warp: longer run-in produces larger, looser stitches; shorter run-in produces smaller, tighter stitches; the run-in ratio is the ratio of yarn from each warp thread if multiple guide bars are used.
- Stitches can be open or closed, distinguished by the direction of underlap and overlap motions.
- Opposite directions create closed stitches.
- Same direction creates open stitches.
- Closed laps are heavier, more compact, less extensible, and more opaque than open laps constructed from the same yarn and under similar knitting conditions.
Basic Warp Knit Structure Variations
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Five basic lapping variations compose all guide bar movements.
- Overlap followed by an underlap is a closed lap.
- Overlap followed by an underlap in the same direction is an open lap.
- Only overlaps and no underlaps are open-only laps.
- Only underlaps and no overlaps are laying-in laps.
- Neither overlaps nor underlaps are miss-lapping.
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A pillar stitch (chain stitch) involves lapping yarn guides over the same needle.
- These stitches lack lateral connections between wales.
- The stitches are interconnected only in the direction of the wales.
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A fabric is not created with a pillar lap; only chains of disconnected wales occur.
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The 1&1 lap (Tricot lap) involves alternating overlap and underlap motions on two defined needles.
- Underlaps connect courses and wales.
- Simplest structures are formed between adjacent needles.
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Atlas lap differs in that laps continue over two or more courses in one direction, then return in the opposite direction to the starting point.
Single- or Double-needle Overlaps
- Overlap movements are typically across one needle space to avert strain on warp thread and needles from simultaneous knock-off actions.
- Varying tensions on loops negatively influence their appearance.
- Underlap between double overlaps has the appearance of a sinker loop.
Single Bar Structures
- Plain warp knitted structures are produced on a single needle bar.
- Resulting structures are called single-face fabrics.
- Rib and interlock knit structures are made on double needle bars, creating double-face fabrics.
- In single-face structures, stitches are visible on one side (technical face); the other side (technical back) only displays underlaps.
Other Key Concepts
- Underlaps alone cannot form a fabric. They are often combined with other movements.
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Description
Dive into the intricacies of warp knitting with this quiz. Understand the formation of loops, the significance of underlap, and the effects of yarn consumption on fabric stability. Test your knowledge on how these factors contribute to the overall quality and characteristics of knitted fabrics.
