Crepe Fabrics Overview
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Questions and Answers

What characterizes the surface of crepe fabrics?

Crepe fabrics are characterized by their roughness and irregularity, producing an irregular and broken surface effect.

How does the twist multiplier relate to crepe yarns?

Crepe yarns have a twist multiplier that ranges from 4.5 to 9.5, making them hard and capable of snarling.

Describe one method for achieving a crepe effect through special finishes.

One method involves subjecting a cotton-polyester blended fabric to chemical and mechanical shrinkage to create a crinkled and rough effect.

What is the role of special woven structures in creating crepe fabrics?

<p>Special woven structures use unique weave designs to impart a rough and irregular appearance to the fabric.</p> Signup and view all the answers

What is meant by 'reversing' in the context of crepe weaves?

<p>'Reversing' refers to taking an irregular motif and flipping it to create a neat crepe effect, requiring double the ends and picks of the base motif.</p> Signup and view all the answers

Explain how crepe fabrics are utilized in the medical field.

<p>Crepe fabrics are used as bandages in the medical field due to their texture and flexibility.</p> Signup and view all the answers

What types of yarns are important for weaving crepe fabrics?

<p>Both hard and soft yarns are important, but crepe yarns, which are hard with a higher twist multiplier, are essential for creating the crepe effect.</p> Signup and view all the answers

How can silk fabrics achieve a crepe effect?

<p>Silk fabrics can achieve a crepe effect by being treated with dilute organic acids, like hydrochloric acid, which create a crushed and abraded look.</p> Signup and view all the answers

How is the crepe weave effect achieved using reverse motifs?

<p>The crepe weave effect is created by flipping the red pattern in a grid and copying the reversed motifs to various sections.</p> Signup and view all the answers

What is the outcome of combining two or more weaves in a design?

<p>Combining weaves produces irregularity, enhancing the crepe effect.</p> Signup and view all the answers

What is the significance of using irregular sateen in creating a crepe weave?

<p>Irregular sateen increases the irregularity of the fabric design, intensifying the crepe effect.</p> Signup and view all the answers

How do you calculate the ends in a crepe weave combining 8-thread sateen and plain weave?

<p>The ends are calculated using the LCM of ends of designs multiplied by the number of designs, which is 16 in this case.</p> Signup and view all the answers

Describe the grid structure for an 8-thread sateen and plain weave combination.

<p>The grid structure consists of 16 x 8 threads, incorporating both the 8-thread sateen and plain weave.</p> Signup and view all the answers

What patterns are used in the example combining 8-thread irregular sateen and 3/1 twill?

<p>The patterns used are an 8-thread irregular sateen on a grid of 8 x 8 threads and a 3/1 twill on a grid of 4 x 4 threads.</p> Signup and view all the answers

In the process of constructing a crepe weave, what is the role of the reversed section?

<p>The reversed section provides contrast and variation, enhancing the overall texture of the weave.</p> Signup and view all the answers

What is meant by the term 'crepe weave effect'?

<p>The crepe weave effect refers to the textured, irregular finish that mimics the qualities of crepe fabric.</p> Signup and view all the answers

What is the formula to determine the total ends when combining two designs?

<p>Ends = LCM of ends of designs x No. of Designs</p> Signup and view all the answers

How do you find the number of picks when combining fabrics?

<p>Picks = LCM of picks of designs</p> Signup and view all the answers

In the example of crepe design using 12 threads irregular sateen and 6 threads standard sateen, what is the total number of ends?

<p>The total number of ends is 24.</p> Signup and view all the answers

What types of weaves are typically used in the superimposition method of crepe design?

<p>Sateen and its derivatives are typically used.</p> Signup and view all the answers

In constructing a crepe weave effect, using a 10-thread irregular satin and plain weave, what is the required number of picks?

<p>The required number of picks is 10.</p> Signup and view all the answers

For a crepe design using 7 threads weft extended sateen, what are the dimensions of the threads?

<p>The dimensions are 14 x 7 threads.</p> Signup and view all the answers

Calculate the ends required for a crepe design combining 6 threads satin with 6 threads sateen.

<p>The ends required are 12.</p> Signup and view all the answers

What is an example of a combination that results in a crepe design using an extension factor?

<p>Combining 7 threads weft extended sateen with 14 threads regular sateen is an example.</p> Signup and view all the answers

What is the LCM of the ends when superimposing an 8-thread regular sateen and a 4-thread standard sateen?

<p>The LCM of the ends is 8.</p> Signup and view all the answers

In the example of superimposing a 4-thread standard sateen and a 6-thread standard sateen, what is the LCM of the picks?

<p>The LCM of the picks is 12.</p> Signup and view all the answers

When constructing a crepe weave with a 10-thread irregular sateen and a 5-thread irregular sateen, what is the required number of ends?

<p>The required number of ends is 10.</p> Signup and view all the answers

What kind of threads does a woven structure involving a 6-thread standard extended sateen and a 12-thread irregular sateen require?

<p>It requires 12 ends and 12 picks.</p> Signup and view all the answers

How does the move number of a 10-thread regular sateen affect the overall threading when constructing a crepe weave?

<p>The move number affects the arrangement of threads but the number of ends remains 10.</p> Signup and view all the answers

For a crepe weave made by superimposing a 12-thread irregular sateen on a 6-thread standard sateen, what is the LCM of the ends?

<p>The LCM of the ends is 12.</p> Signup and view all the answers

What is the necessary LCM for the ends when combining a 10-thread regular sateen with move number 7 and another 10-thread irregular sateen?

<p>The necessary LCM for the ends is 10.</p> Signup and view all the answers

What is the significance of calculating the LCM for both ends and picks in crepe weave constructions?

<p>Calculating the LCM ensures that the threads align properly during the weaving process.</p> Signup and view all the answers

Study Notes

Crepe Fabrics

  • Crepe fabrics are characterized by roughness and irregularity
  • They avoid stripes, lines, or geometrical structures, creating an irregular surface effect.
  • Crepe fabrics are often made from a combination of two or more weave designs.
  • Sateen weaves are commonly used to create the crepe effect.
  • Crepe fabrics are used in medical applications (bandages) and in silk weaving (covering emery rollers).
  • Fine crepe fabrics are also used for garments (dressings).

Methods of Producing Crepe Fabrics

  • Crepe effect can be achieved in various ways:
    • Using crepe yarns
    • Applying special finishes
    • Using special woven structures

(1) By Using Crepe Yarns

  • A range of hard and soft yarns are used in weaving.
  • The hardness of the yarn depends on the twist multiplier.
  • Regular weaving yarns have a twist multiplier between 2.5 and 4.5.
  • Crepe yarns have a higher twist multiplier (4.5 to 9.5).
  • Crepe yarns are hard and prone to snarling, adding a rough, irregular texture to the fabric due to over-twisting and snarling.

(2) By Applying Special Finishes

  • Crepe effects can be created on regular woven fabrics by using special mechanical or chemical processes.
  • For example, chemical and mechanical shrinkage can be used to create a crinkled and rough texture in cotton-polyester blends.
  • Similarly, dilute organic acids (like hydrochloric acid) can be applied to silk fabrics for a crushed and abraded appearance.
  • An embossed crepe effect occurs when the fabric is pressed between engraved cylinders under high pressure.

(3) By Using Special Woven Structures

  • A special weave pattern is created to produce a rough, irregular look in the fabric.
  • Common methods include:
    • Reversing
    • Combining weaves
    • Superimposing weaves

(i) Crepe By Reversing

  • An irregular motif is chosen as the basis.
  • The selected motif is then reversed.
  • The number of ends and picks needed is double the amount of the original motif.
  • This method results in neat crepe effects.
  • Examples provided involve reversing patterns.

(ii) Crepe By Combination of Weaves

  • Two or more weaves are combined within the same design to produce irregularities.
  • At least one weave needs to be irregular for a stronger crepe effect; ideally both should be.
  • Sateen weaves are frequently used in creating this irregularity.
  • Specific examples provided show how to combine weaves to produce crepe.

(iii) Crepe By Superimposition of Weaves

  • One weave is placed on top of another to create a crepe effect.
  • Sateen weave designs and their variations are commonly superimposed, but different weaves can also be combined for desired results.
  • The number of threads required for this method equal the least common multiple (LCM) of both weaves.
  • Several examples for constructing crepe based on superposition approach are presented.

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Crepe Weaves PDF

Description

This quiz delves into the characteristics and production methods of crepe fabrics. Discover the unique properties that define crepe, including the variety of yarns used and their applications in textiles and medical fields. Test your knowledge on how crepe fabrics are woven and finished.

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