Double lockstitch (Basic stitch type 301):

Advantages:

Ø  Lower thread consumption than double chain stitch

Ø  Same seam strength on the upper and lower sides

Ø  Good seam strength owing to interlocking in the middle of the material (but not as strong as with the chain stitch)

Ø  Easy tying of the seam end by reverse sewing

Ø  No seam impressions on thin woven fabrics

Disadvantages:

Ø  Considerable mechanical stress on the sewing thread when forming the stitch.

Ø  Lower productivity owing to bobbin changing ( standstill and handling times)

Bartack :

Ø  Double lock stitch for separate tying of the start and the end of seams

Ø  Double lock stitch for tying belt loops, for example.

Ø  Double lock stitch bar tacks for strengthening jeans pockets for example.

Double chain stitch (Basic stitch type 401):

Advantages:

Ø  High seam stretching and high seam strength.

Ø  Little mechanical stress on the sewing thread when forming the stitch

Ø  The chain can safely run out without material – even at high sewing speeds

Ø  Only marginal displacement puckering owing to interlocking of the needle thread and bobbin thread on the underside of the material being sewn.

Ø  High productivity owing to large thread supply ( no spooling necessary)

Disadvantages:

Ø  Twice the sewing thread consumption compared with double lockstitch

Ø  Thick underside of seam-impressions possible on thin woven fabrics

Ø  Seam opening in the event of skipped stitches.

Zig-Zag Stitch (Stitch types 304 and 404) :

Ø Exists as both double lockstitch and double chain stitch

Ø  Primarily used in the corsetry sector

Ø  Optimum stitch for decorative seams.

Overlock Stitch (Basic stitch type 501) :

Advantages :

Ø  High seam stretching for edge trimming seams

Ø  Excellent stretching properties

Ø  Saving of working steps if a safety stitch type is used

Ø  Needle thread determines the strength of the seam,while looper threads ensure good seam appearance and softness.

Ø  Little mechanical stress on the sewing thread when forming the stitch

Ø  High sewing speeds possible.

Ø  High productivity thanks to large thread supply (no spooling necessary)

Disadvantages :

Ø  Very high sewing thread consumption.

Flatlock Stitch (Basic stitch type 601 ) :

Advantages :

Ø  High stretching properties

Ø  Flat seams with no marks through the material on knitwear.

Ø  Decorative seams if a textured thread is used.

Disadvantages:

Very high sewing thread consumption (example: 4 needle threads,4 looper threads, 1 face thread)

I am Very interested in blogging. Its my passion and hobby. I like playing different games also. The above i only about my leisure time. I am a Wash technician working in Kenpark Bangladesh PVT. Ltd. I passed from Daffodil International University with a certificate of B.Sc in Textile Engineering.

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