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What characterizes the surface of crepe fabrics?
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?
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.
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?
What is the role of special woven structures in creating crepe fabrics?
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What is meant by 'reversing' in the context of crepe weaves?
What is meant by 'reversing' in the context of crepe weaves?
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Explain how crepe fabrics are utilized in the medical field.
Explain how crepe fabrics are utilized in the medical field.
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What types of yarns are important for weaving crepe fabrics?
What types of yarns are important for weaving crepe fabrics?
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How can silk fabrics achieve a crepe effect?
How can silk fabrics achieve a crepe effect?
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How is the crepe weave effect achieved using reverse motifs?
How is the crepe weave effect achieved using reverse motifs?
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What is the outcome of combining two or more weaves in a design?
What is the outcome of combining two or more weaves in a design?
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What is the significance of using irregular sateen in creating a crepe weave?
What is the significance of using irregular sateen in creating a crepe weave?
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How do you calculate the ends in a crepe weave combining 8-thread sateen and plain weave?
How do you calculate the ends in a crepe weave combining 8-thread sateen and plain weave?
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Describe the grid structure for an 8-thread sateen and plain weave combination.
Describe the grid structure for an 8-thread sateen and plain weave combination.
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What patterns are used in the example combining 8-thread irregular sateen and 3/1 twill?
What patterns are used in the example combining 8-thread irregular sateen and 3/1 twill?
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In the process of constructing a crepe weave, what is the role of the reversed section?
In the process of constructing a crepe weave, what is the role of the reversed section?
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What is meant by the term 'crepe weave effect'?
What is meant by the term 'crepe weave effect'?
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What is the formula to determine the total ends when combining two designs?
What is the formula to determine the total ends when combining two designs?
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How do you find the number of picks when combining fabrics?
How do you find the number of picks when combining fabrics?
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In the example of crepe design using 12 threads irregular sateen and 6 threads standard sateen, what is the total number of ends?
In the example of crepe design using 12 threads irregular sateen and 6 threads standard sateen, what is the total number of ends?
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What types of weaves are typically used in the superimposition method of crepe design?
What types of weaves are typically used in the superimposition method of crepe design?
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In constructing a crepe weave effect, using a 10-thread irregular satin and plain weave, what is the required number of picks?
In constructing a crepe weave effect, using a 10-thread irregular satin and plain weave, what is the required number of picks?
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For a crepe design using 7 threads weft extended sateen, what are the dimensions of the threads?
For a crepe design using 7 threads weft extended sateen, what are the dimensions of the threads?
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Calculate the ends required for a crepe design combining 6 threads satin with 6 threads sateen.
Calculate the ends required for a crepe design combining 6 threads satin with 6 threads sateen.
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What is an example of a combination that results in a crepe design using an extension factor?
What is an example of a combination that results in a crepe design using an extension factor?
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What is the LCM of the ends when superimposing an 8-thread regular sateen and a 4-thread standard sateen?
What is the LCM of the ends when superimposing an 8-thread regular sateen and a 4-thread standard sateen?
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In the example of superimposing a 4-thread standard sateen and a 6-thread standard sateen, what is the LCM of the picks?
In the example of superimposing a 4-thread standard sateen and a 6-thread standard sateen, what is the LCM of the picks?
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When constructing a crepe weave with a 10-thread irregular sateen and a 5-thread irregular sateen, what is the required number of ends?
When constructing a crepe weave with a 10-thread irregular sateen and a 5-thread irregular sateen, what is the required number of ends?
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What kind of threads does a woven structure involving a 6-thread standard extended sateen and a 12-thread irregular sateen require?
What kind of threads does a woven structure involving a 6-thread standard extended sateen and a 12-thread irregular sateen require?
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How does the move number of a 10-thread regular sateen affect the overall threading when constructing a crepe weave?
How does the move number of a 10-thread regular sateen affect the overall threading when constructing a crepe weave?
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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?
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?
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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?
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?
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What is the significance of calculating the LCM for both ends and picks in crepe weave constructions?
What is the significance of calculating the LCM for both ends and picks in crepe weave constructions?
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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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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.