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A Presentation on Seam And Seam Classes
16

Seam and Seam classes

Jan 13, 2017

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Engineering

Razib Sheikh
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Page 1: Seam and Seam classes

A Presentation onSeam And Seam Classes

Page 2: Seam and Seam classes

Khulna University of Engineering & Technology

Prepared by,Md. Razib Sheikh

ID. 1221025Final Year Student

Department Of Textile Engineering, KUET.

Page 3: Seam and Seam classes

Seam• The line along which a number of layers of fabrics are joined is

called the seam. Seam can be created in sewing of fabrics or by joining of fabrics in any other alternative way(Welding, Fusing, Moulding, Adhesive).

• In other words, Seam is the combination of stitch which makes line to join two ply of fabric.

• The seam which is created by sewing of fabrics, known as stitched seam.

• Seam is used as functional purpose(e.g. strength, security etc.). Sometimes used as decorative purpose.

Page 4: Seam and Seam classes

Seam Characteristics Seam strength: Seam strength should be equal to or a little bit

lower than the strength of the fabric in both direction. Elasticity: The elasticity of seams should be equal to or greater

than the elasticity of the fabric. Durability: The Durability of seam should be equal to duration of

the use of the garment. Security: During the wearing of the garment there should have

guarantee so the for normal reasons the will not be opened due to the opening or breaking of the thread.

Comfort: The seam of some garment( e.g. underwear, undergarment) should have comfort feel.

Some special characteristics e.g. water proof of seam should have, as for required garments.

Page 5: Seam and Seam classes

Seam Quality ParametersThough the stitch types chosen for a seam depend on the functional or aesthetic requirements of the seam, seam quality can be measured based on the following parameters:1. Seam size:

It is measured with seam depth, seam length and seam width.2. Seam slippage strength:

It is the amount of force required to pull out a total of ¼” of the opposing sets of yarns perpendicular to the seam line.

3. Seam strength:It is the force required to break open the seam either by breaking the thread or by breaking the sewn material.

Page 6: Seam and Seam classes

Seam classesAccording to BS 3870-1:1991, the eight seam classes are following: • Class 1 – Superimposed seam.• Class 2 – Lapped seam.• Class 3 – Bound seam.• Class 4 – Flat seam.• Class 5 – Decorative/Ornamental seam• Class 6 – Edge finishing/neatening seam.• Class 7 – Applied seam.• Class 8 – Others. Fig: Different types of seam

Page 7: Seam and Seam classes

Class 1 – Superimposed seam• This is the most common & mostly used

seam for joining fabrics. In this seam, two plies of fabric are placed on one another perfectly & then the fabrics are sewn.

• Most commonly used.• The sewn edges of the fabrics remain in

the same side. • It has over 50 variations.• This class of seam can be sewn a variety of

m/c. e.g. Lock stitch, overlock machine.Uses:• Mostly used in inside seam like as shirts,

pants, trousers & children wears .

Fig: Class 1 – Superimposed seam

Page 8: Seam and Seam classes

Class 2 – lapped seam• This type of seam is achieved with two or

more pieces of fabric over lapping each other.

• Two sewn ends of the fabric are in opposite direction.

• Mostly two needle chain stitch m/c is used.

• Seam under this class is very strong.• At least two line of stitching are used.Uses:• This class of seam is not mostly used for

sewing garments. This seam is used in sewing jeans pants, lunges etc.

Fig: Class 2- lapped seam

Page 9: Seam and Seam classes

Class 3 – Bound seam• A bound seam is one piece of fabric

encompassing the raw edge of another piece of fabric. This produces a neat edge on a seam exposed to view or to wear.

• The purpose of bound seam is to finish an edge of garment.

• Some time used as decorative purpose.• The binder fabric may be different colors.• There are 18 variation of bound seam.Uses:• Used in sewing men’s underwear, pants,

sleeping suits, Neckline of a T-shirt, yoke joint in the shirt waist band.

Fig: Class 3 – Bound seam

Page 10: Seam and Seam classes

Class 4 – Flat seam• Flat seam are constructed by

having two pieces of fabric meet precisely at their edges.

• Seam thickness is comparatively less.

• Zigzag stitch may be produced. • Edge should be cleaned before

sewing to avoid fraying.Uses:• This seam is widely used in under

garments & in knitted items. 

Fig: Class 4 - flat seam

Page 11: Seam and Seam classes

Class 5 – Decorative/Ornamental Seam• This type of seam is made by making one or

more adjacent stitch lines in one or more layer of fabric. The fabric which we used that would be folded in several times and then according to the under side of the folded part of the fabric stitch can be produced.

• This seam type consists of a minimum of one component.

• Multi needle sewing m/c is used.- • Seam under this class are produced only

for decorative purpose.Uses:• Used in pant or other dresses, Cartains, Table

cloths, Furniture wears, Decorative ladies wears etc.

Fig: Class 5 – Decorative/Ornamental Seam

Page 12: Seam and Seam classes

Class 6 – Edge neatening seam• The seam of class-6- is called edge neatening

which is used to holds the edge of the fabric such that the yarns of the fabric can not open easily.

• All the over Lock stitch is edge neatening class seam.

• It can be made by overlock m/c.- • Extensively used.Uses:• Mostly used knitted garments and hemming. • To protect the fabric edge such that the warp

yarn of the fabric can not easily open. • Serging trouser panels, flys, facings, etc.

Fig: Class 6-Edge neatening

Page 13: Seam and Seam classes

Class 7 – Applied Seam• This seam class involves seams that

require the addition of another component onto the edge of a piece of fabric e.g., elastic braid onto the edge of ladies briefs. This type of seam requires two components.

• They are mainly used to a decorative material to an edge of seam such as lace-elastic.

• Similar to lapped (class-2) but the joined component is extended limited on both sides from sewn line.

Uses:• Joining of lace, elastic braid to shirts of

young people, ladies briefs etc.

Joining of lace

Joining of elastic braid

Fig: Class 7 – Applied Seam

Page 14: Seam and Seam classes

Class 8 – Others

• This seam class consists of one piece of fabric that is turned in on both edges. The edge of fabric is sewn by folding in various ways.

• It is most commonly seen in belt loops or bets for which a folder can be attached to the machine. This type of seam requires only one component.

Fig: Seam class 8

Page 15: Seam and Seam classes

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Page 16: Seam and Seam classes

Thanks