1644 Words7 Pages

Introduction
The sewing thread is a key supplying unit for garment industry considering it as an important material. Purpose of sewing thread is to stitch garment or used for decorative purposes. Sewing thread significantly effect on garment production and on its quality. [1] After considering thread’s performance and appearance then major attention is to settle its cost. Thread cost can be define as the cost of actual thread that used in garment production, thread wastages during sewing and unused thread in stock. If the thread is faulty it rises the production cost and causes more threads breakages. [2] So the usage of good quality sewing thread can increase the profit of the garment industry. [1] Moreover, seam failure might occur during*…show more content…*

[4] This class is mostly used for joining two or more plies together and sergeing to stop fabric fraying. [5] The calculation for the consumption of sewing thread has remained matter of attention of the research for last few decades. They have successful developed certain mathematical formulae which help to predict consumption of sewing thread for the stitch classes e.g Mathematical Modelling, Fuzzy logic, Geometrical Modeling, Regression analysis, Taguchi design and Artificial Neural Networking etc [6], [7], [8], [9], [10] Geometrical Model of Stitch Class 504 With the help of projection microscope, profile projector and literature review, it was known that geometry of overlock stitch is three dimensional. The three dimensional shape of stitch class 504 is shown in the Figure [1.1]. Figure 1.1Structure of stitch 504 & its appearance of face & back of*…show more content…*

The length of a stitch is calculated by L= 1⁄SPC whereas L is length of one stitch and SPC is abbreviation of stitches per centimeter. Thickness can be calculated by multiplying the thickness of one ply of the fabric with the number of plies. Figure 1.2 shows the geometry of interlooping of needle thread with lower looper. Figure 1. 2 Geometry of interlooping of needle thread with lower looper The interlooping of the needle thread can be divided into four segments. The part A to B & the part C and D are identical points i.e a quarter circles whose consumption is π/2 〖(r〗_l+2r_u) (as the circumference of circle is 2πr where r the radius of the circle and the circumference of quarter circle is 2πr/4) where r_l is the radius of the lower looper thread, r_u is the radius of the upper thread (needle thread), Moreover, part B to C is a straight line which is equal to the twice the radius of radius lower looper thread 〖 I〗_1= π/2 〖(r〗_l+2r_u)+2r_l+ π/2 〖(r〗_l+2r_u)= π (d_l/2+ d_u )+ d_l= 0.0917/√(〖Ne〗_l )+ 0.1121/√(〖Ne〗_u ) (1.2) Replacing π=3.14 d_u= 1/(28√(〖Ne〗_u )) and d_l= 1/(28√(〖Ne〗_l )) the formula for thread diameter calculation is = 1/(28√Ne), the count of the thread in Tex (direct system) to change it into Ne, English count (direct system) we can use the formula Ne=

[4] This class is mostly used for joining two or more plies together and sergeing to stop fabric fraying. [5] The calculation for the consumption of sewing thread has remained matter of attention of the research for last few decades. They have successful developed certain mathematical formulae which help to predict consumption of sewing thread for the stitch classes e.g Mathematical Modelling, Fuzzy logic, Geometrical Modeling, Regression analysis, Taguchi design and Artificial Neural Networking etc [6], [7], [8], [9], [10] Geometrical Model of Stitch Class 504 With the help of projection microscope, profile projector and literature review, it was known that geometry of overlock stitch is three dimensional. The three dimensional shape of stitch class 504 is shown in the Figure [1.1]. Figure 1.1Structure of stitch 504 & its appearance of face & back of

The length of a stitch is calculated by L= 1⁄SPC whereas L is length of one stitch and SPC is abbreviation of stitches per centimeter. Thickness can be calculated by multiplying the thickness of one ply of the fabric with the number of plies. Figure 1.2 shows the geometry of interlooping of needle thread with lower looper. Figure 1. 2 Geometry of interlooping of needle thread with lower looper The interlooping of the needle thread can be divided into four segments. The part A to B & the part C and D are identical points i.e a quarter circles whose consumption is π/2 〖(r〗_l+2r_u) (as the circumference of circle is 2πr where r the radius of the circle and the circumference of quarter circle is 2πr/4) where r_l is the radius of the lower looper thread, r_u is the radius of the upper thread (needle thread), Moreover, part B to C is a straight line which is equal to the twice the radius of radius lower looper thread 〖 I〗_1= π/2 〖(r〗_l+2r_u)+2r_l+ π/2 〖(r〗_l+2r_u)= π (d_l/2+ d_u )+ d_l= 0.0917/√(〖Ne〗_l )+ 0.1121/√(〖Ne〗_u ) (1.2) Replacing π=3.14 d_u= 1/(28√(〖Ne〗_u )) and d_l= 1/(28√(〖Ne〗_l )) the formula for thread diameter calculation is = 1/(28√Ne), the count of the thread in Tex (direct system) to change it into Ne, English count (direct system) we can use the formula Ne=

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