Textile Starch
Modified thinboiling starches like acid-modified,
oxidized and ethylated are used in the textile industry.
Yarn. The yarn can be woven or knitted. The warp
will be in the loom for a long time and needs to be strong. Filling
yarns (weft) are inserted by the shuttle on the loom to weave the fabric.
The filling yarns do no require the same strength.
Creel. For each yarn in the warp an end-cone is loaded
on the creel and the yarn is pulled of the cone during weaving. The
yarn is tied to the yarn already in the creel. The yarns are tied onto
the beam and the winder is set to wind the desired amount of warp. The
yarn is wrapped round the warpbeam and the beam is loaded onto the shlasher.
Slasher The wound beams are loaded into the frame
for the slasher. The job of the slasher is to coat the warp yarns with
sizing to give them added strength to withstand the punishment of weaving.When
all the beams are loaded, the yarn is tied to the yarn already in the
slasher. The starch for the sizing is cooked.The warp is mechanically
pulled through the sizing, dried, and wound onto a big metal beam that
will go into the loom. The starch is applied very hot. The starch keeps
the yarn straight and strong and makes it stand the stress of weaving.
The yarn is feed through the heddles and the loom is about to be ready
for weaving.
Desizing.Cloth as it comes from the loom has to be
treated in a series of processes known as finishing operations. There
are removal of impurities - includes desizing - and application of various
chemicals, dyes, softeners, etc. Size is a mixture of substances
that is applied to the warp thread before weaving. The size forms a
coating around the surface of the thread before weaving. This coating
provides the lubrication and prevents the breakage of warp thread during
the weaving operation. Desizing removes the size after weaving.
A starch size is removed by enzymatic desizing with amylase. In general
cellulosic fibres, cotton, rayon and blend of these with synthetic
fibres such as polyester, is sized with starch based sizes. Starch has
good sizing properties on cellulosics and is economical.
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Slasher The wound beams are loaded into the frame
for the slasher. The job of the slasher is to coat the warp yarns with
sizing to give them added strength to withstand the punishment of weaving.When
all the beams are loaded, the yarn is tied to the yarn already in the
slasher. The starch for the sizing is cooked.The warp is mechanically
pulled through the sizing, dried, and wound onto a big metal beam that
will go into the loom. The starch is applied very hot. The starch keeps
the yarn straight and strong and makes it stand the stress of weaving.
The yarn is feed through the heddles and the loom is about to be ready
for weaving.
Desizing.Cloth as it comes from the loom has to be
treated in a series of processes known as finishing operations. There
are removal of impurities - includes desizing - and application of various
chemicals, dyes, softeners, etc. Size is a mixture of substances
that is applied to the warp thread before weaving. The size forms a
coating around the surface of the thread before weaving. This coating
provides the lubrication and prevents the breakage of warp thread during
the weaving operation. Desizing removes the size after weaving.
A starch size is removed by enzymatic desizing with amylase. In general
cellulosic fibres, cotton, rayon and blend of these with synthetic
fibres such as polyester, is sized with starch based sizes. Starch has
good sizing properties on cellulosics and is economical.
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