MUHAMMAD USMAN MAAN 06F-BSTX-003

USMAN ALI GREWAL 06F-BSTX-004

M KASHIF RAZA GUJJAR 06F-BSTX-014

M AHSAN RAZA RIZVI 06F-BSTX-016

SHERAZ ALI BALOCH 06F-BSTX-050

MANSOOR ALI BUKHARI 06F-BSTX-052

Double cloths are those fabrics which consists of two layers of threads that are woven one above the other and stitched together.

These fabrics consists of a minimum of two series of warp threads, and two series of weft threads, face and back.

The upper layer is found by interlacing the face warp threads with the face weft threads, and lower layer by interlacing the back warp threads with back weft threads.

They are also known as two ply fabrics.

There are two objectives in producing double cloth.

i. To enhance the thermal resistance value of the fabric.

ii. To give a good appearance and feel.

Double cloths are classified into following categories, constructed on the principle of;

i. Self thread stitching.

ii. Center thread stitching.

iii.Stitching by thread interchanging.

iv.Cloth interchanging.

v. Single and Double Cloths.

•These fabrics contain only two series of threads in both directions.

Self Thread Stitching

•The stitching of the face cloth layer to the back layer is accomplished by occasionally dropping a face end under a back pick, or by lifting a back end over a face pick or by utilizing both the systems.

Center thread stitching•In these fabrics a third series of threads is introduced either in warp or in weft direction whose entire function is to stitch the two otherwise separate layers of cloth together.

Cloth interchanging

•In these complete cloth layers are made to change places as shown:

Single and Double Cloths

•In these types of cloths the group of threads forming the face are merged together with those of the back to form a single layer at intervals. The face layer is separated from the back wherever a figure is formed.

Self stitched double cloths are constructed by the following methods;

a)Stitching from face to back

b)Stitching from back to face

c)Combination stitching

•In this method the face and back fabrics are stitched together by lowering the face warp below the back weft. The various stages of constructing the design is shown in fig.

The face and back fabrics have been constructed by using a four end irregular sateen weave.

The design of the face and back fabrics are shown at A and B respectively.

A B

The first warp thread of the face fabric stitches with the third pick of the back fabric.

This is constructed as the most suitable stitching point because it is in the middle of the warp float.

The stitching point in the figure C shows the interlacement of all the face warp threads with the back weft threads.

C

A B

The final design of the double fabric is shown at D. The ratio of the face and back threads (warp and

weft) is 1:1.The final design D will require 8 heald shafts by

using divided draft.

D

A B C

D

Industrial Applicationa)Hose pipes

b)Filter cloths

c) Insulation cloths

Other Applications

a) Internal clothsb) Overcoatsc) Heavier fabrics used as outer cloth