Knitting technology Multithread chain stitch Presented by Pragati

Knitting technology Multithread chain stitch Presented by : Pragati rastogi

Class 400 multithread chain stitches FEATURES � The 400 class is the second most frequently used stitch type. q Two components of threads are used, one is needle thread and other is looper thread. q Eyed loopers are used. q Interlacing & interlooping processes are used. q The 400 class requires an upper and a lower thread and use a looper to carry the lower thread and form a thread loop on the underside of the fabric. q Stitch 401 is the simplest kind member of class 400 and stitch 406 is most commonly used member of class 400.

Machines producing 400 Class do not back tack although stitches can be condensed to secure the ends of the threads.

Stitch properties q Appearance q Durability � Compared to the 100 class the 400 classis more durable and used extensively on apparel. q Extensibility

Application areas �Used for woven as well as knitted fabrics and garments. �High quality button hole making and button attaching process. �For trims and components attachment. �Rib collars and cuffs attachment. �Assembly of high-end tailored garments.

ADVANTAGES: q. Strength & extensibility, Chain stitch uses almost twice as much thread as lockstitch, making the stitches extensible and stronger. q. Reduces seam pucker as the stitch is set underneath the fabric rather then between the fabric layers. q. All these factors contribute to increased production. DISADVANTAGES: Runback: the seams can unravel or runback easily if the threads are cut or one of them is damaged. The seam can also runback from the finished end. To reduce this problem the seam should be over-sewn or bar-tacked

The most common stitches in this class �The 401 or two thread chain stitch. � 402 or cording stitch. �Stitch type 404. �Stitch type 406 &407.

The 401 or two thread chain stitch �It is also called double locked chain stitch. �Its appearance is the same as the 101 with a flat straight thread formation similar to a lock stitch on the face of the fabric and a loop on the underside. �The 401 can be unravelled, but only if the looper thread is pulled in the direction the stitches were formed

The 401 machines are capable of operating at very high speeds. These chain stitch machines often use multiple needles to produce parallel rows of stitching. The loop formation of the chain stitch elongates when extended; thus it is used for seams that require elasticity, such as setting sleeves and attaching elastic. This stitch type is also well suited to automated sewing equipment such as automatic seamers.

uses �Knit seaming, woven lap seams etc.

Stitch type 402 or cording stitch �It is used primarily for stitching permanent creases. �It uses two needle threads that produce two parallel rows of stitching on the face of the fabric. �A looper thread travels between the two needl e threads on the back of the fabric creating a ridge or crease between the needle threads on the face. �Used in sportswear where a crease needs to be maintained or on the back of the gloves.

Stitch type 404 �It is similar in appearance to a 304 stitch in the sense that it is also a zigzag stitch except the difference that it is formed as a chain stitch and contains 1 loops on one side. �More elastic than 401.

Stitch type 406 & 407 Features �They are known as bottom cover stitches. �They appear as 2 or 3 rows of parallel “lock stitching” on the face of the fabric while a looper thread connects the rows on the back. �The 406 stitch uses 2 needle threads and 1 looper thread like a 402 except that it does not ridge up. �Stitch type 407 is very much similar to 406 except that it uses three needle threads and has even more stretch.

uses �They are used to cover seam or unfinished edges on the inside of garments and to keep them flat. �produces flat, comfortable seams on �necklines of T-shirts bottom felling of Tshirts, or on binding of men‘ s brief. �The primary use of 407 is to attach elastic to undergarments , which require maximum stretch.

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