Defects in polyester dyeing:
During the
dyeing of the polyester disperse, the defects given below can be found: |
(A) listing
1. Due to non-recovery of heat setting:
If the heat
setting is not correct, then the defect may be given below:
(i) Listing of both: Due to this defect
there is a difference between the center and the shade on the shore.
(II) Very much in the fabric. Changes in
dimension
The above
impedance is not unusual heat setting, the heat setting is not complete
(Example: the temperature in each chamber is not the same), the temperature is
low due to the correct steam, the thickness of the fabric which is to be set in
the heat, the heat setting machine speed According to the proportion of mixed
fibers in the fabric, the heat setting can not be done due to non-overflowing
speed.
Check
whether the cloth is properly set is done by checking the below given
procedure.
(i) All the sides in the chamber can do the
test thermal paper or not.
(ii) 100 cm on
cellulose (selvedge) to check the correct over feed Mark a mark and after the
heat set, the mark applied to the display is printed. Generally after heat set,
it is between 95 to 97 cm. (2% to 5%) but it's
over how much over sores. Has been depending on it.
(iii) Determination of Dimensional Stability
of Heat Set Cloth. It should be less than 1%.
2. Listing error can occur even if the
witching is not good. The main reasons for not batching are given below.
(i) Very baked batch
(ii) Loose weighting
(iii) Clothing at the time of weaving
(iv) The width of uneven fabric width.
3. There is no fault in the mix of different
fibers in mixed fabrics, there is no proper twist in the neck. The counting in
the hoarse counting can also cause a lingering flaw.
4. Due to occasional defects in the machine
(such as in beam dyeing machine) I cause listing defects. The main reasons for
this defect are:
(i) The pressure of the flow of fluid inside
and outside the inside is not right.
(ii) Leakage of pressure and closing of
pores, Dod in pump etc.
(B) Poor Color Fastness to Washing & Rubbing:
Although
dips are very hard to wash and rub, but sometimes. In these, there is a
complaint that the colors are not confirmed, some reasons are given below.
(i) To reduce the temperature of the dyeing
character, apply the color to the dyeing character. For example, if we are
dyeing at 130 degree centigrade and we have to put some
colors and then we should reduce the temperature of dyeing otherwise the color
will not be caught.
(ii) Dyeing at a temperature below the
correct temperature.
(III) Do not insert a dispersing agent.
(IV) To be more prone to clothing
(Halriness)
(v) Do not choose the right colors.
(Vi) Thermosol dyeing should have the
ability to absorb the colors on the cloth and the curing should be fine with
it.
(VII) If the color is not fully exposed
during dyeing by carrier method, then there was less hope of coloration and
rubbing in color.
(VIII) Being water hardness also reduces the
convergence of the colors being fixed.
Problem in getting right shade:
Polyester
Differs Getting the right shade during coloring is a lot of hard work. The
reason for this is that under 100 degrees,
the cloth does not own its own road and it is very difficult to check the shed
at 130 degree centigrade, which can result in the
following shade flaws.
1. Shade being light
2. Changes in Tone for Shade
3. Do not meet a similar shade.
4. Show whiteness in the shade
5. Forming stains or rings
The reasons
for the shortages mentioned above are given below:
1. Career in a large amount of career dyeing.
2. Carrying the carrier down from the optimum
temperature or making it dry and dissolve in water
3. Staying steam during carrier dyeing sticks
on.
4. Mostly dyeing, in the dyeing machine, the
mild sheds are in heavy sheds. If dyeing can be done in a light shade after
heavy shade, then the shade can be blamed.
5. If a shade is to be prepared with two or
more colors, then it should be noted that the combination of colors is fine.
6. Color should be doled at a little
temperature - at very low temperature.
7. During the dyeing, the uneven vertebrates
in the temperature can also be the reason for not getting the correct shed.
8. The pH, if not fine, the shade will not get
better
9. If shades of different mills have been used
while making cloth, then the shade will be uneven after dyeing.
10. If there is oily oil in the cloth, then the
shed is not even good.
11. Sometimes the flaw comes from the fault in
the machine.
