The majority of known polymer materials are electrically insulating.
But there are some of polymers are intrinsically conducting in
nature, However, it is lacking in process ability, and the scope for
manipulation of electrical and mechanical prop
erties is limited. The
method which used to solve this problem is an addition of a
conductive metal filament into a polymer filament yarn. Which can
be directly integrated into a textile, or can be knitted. So we made
a device able to produce this kind of conductive yarns which
depends on melt spinning technique but with the elimination of
necessary pressure for extrusion. And we were able to produce
samples of copper filament coated with polymeric material (low
density polyethylene).
In the past four decades, the woven fabrics has been subject to inordinate
competition which has primarily come from the fashion (short runs),
knitting, and nonwoven segments. The weaving machinery manufacturers answered
the pressure of competitio
n by concentrating on the design of looms that offered relatively
very high speeds. Obviously, to meet the demands of the higher productivity on the loom,
the material characteristics and the quality and efficiency of the preceding processes also
needed to be improved. And this improvement is doing by encapsulate the yarn with size
film before weaving, by the sizing process which considered as the heart of weaving.
this research is aimed to studying the affective factors of sizing, and define the ideal
values of it. This research reffered to the effect of sizing machine speed on yarn size
witting time and then on its coating percent, other side the rollers squeezing pressure of
sizing machine and sizing solution viscosity affect on yarn size coating percent too which
affecting on its resistance toward weaving operation and usage later, because , the success
of sizing process leads to success the following stages like, weaving, finishing, and then,
success in fabric usage.
A newly developed methodology based on image analysis technique has been used to measure fiber openness and the results are compared with those of the traditional method of measurement of fiber openness. The role of different opening process paramete
rs in deciding the openness of fibers obtained by image analysis technique is found to be much higher than that obtained by beaker test method. It is found that the higher speed of opening rollers and higher angle of grid bars improve fiber openness appreciably, but with little deterioration in fiber quality. The higher fiber openness ultimately results into more regular and less imperfect yarn.
With the increase in fiber openness, yarn strength and yarn breaking
elongation increase initially and then decrease. Yarn hairiness almost
unchanged with the increase in fiber openness.
research The aim of this is to find an explicit relationship between the strength of fibers, bundle and
yarns. The CV values of the strength are given as well. This provides a relatively simple method for
estimation of staple yarn strength, while a
voiding some difficulties of an empirical method. The effects of
important factors such as fiber length and thickness, twist and count of yarn are considered. The results
are verified by published data in Mechanical Engineering of Textile Industries and Their Technologies,
Faculty of Mechanical and Electrical Engineering, Damascus University. and also in Al-Kumasiah
company in Damascus city.
This research provides suggestions if we apply it it will help in estimating directly the yarn strength
without manufacturing and suitable testing of the yarn.
