MY PROFILE

Name : Abdullah Al Mahfuj.Department : Textile. Program : B Sc in Textile Engineering .ID : 142014007Green University of Bangladesh .

Name of My Presentation

Crimp & Crimp Interchange

LETS START WITH MYJOURNEY....

• Crimp• Crimp%• Crimp ratio

• Crimp amplitude • Take Up %

• Effect of crimp of yarn on fabric properties

• Crimp interchange

Crimp • woven fabric made of two sets of yarns - warp

yarns and weft yarns. Warp and weft yarns are interlaced with each another and form fabric sheet.

• When warp and weft yarn interlace in fabric they follow a wavy path. This waviness of yarn is called crimp.

Crimp%Crimp%: crimp percentage is defined as the mean difference between the straightened thread length and the distance between the ends of the thread while in cloth which is expressed as a percentage. Where, l= Straightened thread length P= crimped length

Crimp ratio: Crimp ratio is the ratio of the yarn length to the fabric length produced from that yarn.

Crimp amplitude: In cloth geometry, the term crimp amplitude is used. Crimp amplitude refers to the extent to which threads are defected from the central place of the cloth.

Take up%

• Take up % or crimp rigidity is a measure of the ability of a textured yarn to recover from stretch.

The difference between length of yarn in the fabric after weaving, expressed as a percentage of the length of the yarn before weaving, is called take up %.

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LpLT

EFFECT OF CRIMP OF YARN ON FABRIC PROPERTIES

RESISTANCE TO ABRASION: With the increase of crimp %, the abrasion resistance will also increase

SHRINKAGE: With the increase of crimp %, shrinkage of fabric will decrease.

FABRIC COSTING: With the increase of crimp%, fabric costing will also increase.

FAULTS IN FABRIC: If there is variation of crimp in the threads then the following faults may be found in fabric;

A) Reduction in strength may occur, and B) Stripes will be seen in yarn dyed cotton fabric.

FABRIC DESIGN: To achieve satisfactory appearance and required shape in finished fabric control of crimp in warp and weft yarn is necessary..

FABRIC STIFFNESS: If crimp is increased then stiffness of fabric will decrease.

ABSORBENCY: With the increase of crimp % absorbency of the fabric will increase.

DIMENSIONAL STABILITY: Dimensional stability will decrease with the increase of crimp%.

FABRIC HANDLE: If crimp is increased then the fabric will be soft in handle.

DYE TAKE-UP: With the increase of crimp the take-up percentage of dye-uptake will also increase.

Crimp interchange A parameter which is significant for the structure of the fabric

and also for the pore shape and size.

When the fabric is loaded there is often a change in the ratio of the crimp of the warp and weft system.

This change is referred to as crimp interchange.