MODIFICATION OF PLAIN WEAVE:

The plain weave may be modified by extending it warp or weft way or both. The extension of the plain weave thus produces a rib effect. A warp rib results from extending the plain weave in the warp direction and a weft rib structure results from extending the plain weave in the weft direction. A matt rib results from extending the plain weave in both directions.
The chart below shows the derivatives/modifications of plain weave :

modifications of plain weave

WARP RIB WEAVE:

These are produced by extending the plain weave in warp wary direction. Fig 3.2 shows the warp rib weaves constructed on regular and irregular basis.

Warp rib Weaves
Warp rib Weaves
At A, B and C are seen regular warp rib weaves and at D, is shown the irregular warp rib weave. E and F show the interlacing of D and A respectively.

WEFT RIB WEAVE:

These are constructed by extending the plain weave in weft direction as shown in Fig.

 In both the warp and weft rib weaves, the appearance of the cloth depends on the respective threadsettings, and to achieve good effects, it is necessary to weave a weft rib with a high number of picks per inch and a comparatively low number of ends per inch. Similarly the warp rib effect can be enhanced with a high number of ends per inch and a comparatively low number of picks per inch. The prominence of the rib can be increased by suitable use of coarse and fine yarns. The dependence of all rib constructions upon the correct thread settings is marked.

The typical constructional particulars for a weft rib structure is given below:
Warp - 2/14s & 36s
Ends/inch - 56
Weft - 18s
Picks/inch - 100
The typical constructional particulars for a warp rib structure is given below:
Warp - 30s cotton
Ends/inch - 126
Weft - 15s cotton
Picks/inch - 38

  Uses:

Rib weaves are used in gross grain cloths, matelasse fabrics, repp cloth which is extensively employed for window blinds in railway carriages and other vehicles, upholstering furniture, and cambric picket handkerchief.

MATT RIB WEAVE:

These weaves are also variously known as hopsack or basket weaves. The matt rib structures result from extending the plain weave in both directions.
The regular and irregular types are shown in Fig.

In case of regular matt weave, the plain weaves are extended equally in the warp and weft directions, where as in case of irregular matt weaves, the plain weave is extended unevenly or irregularly in the warp and weft directions.

Uses:

Matt weave finds extensive uses for a great variety of fabrics such as dress materials, shirtings, sailcloth, duck cloth etc.

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