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Sound wave absorption properties of multi-layers of different woven fabric structures
No full textNowadays, acoustic health is a priority issue in homes and offices. To address the problem, a variety of
sound-absorbing materials are used, one of which is woven and nonwoven fabrics. This paper focused
on the sound absorption analysis of two different woven fabric structures as an increasing layer and with
base material nonwoven fabric. The fabrics' sound absorption properties were determined using an
impedance tube across 80–5000 (Hz) frequencies. The result demonstrated that the absorption of sound
energy through plain fabric decreases as the number of layers was increased. On the other hand, in the
case of a sateen fabric structure, the absorption of sound energy increases with the number of layers.
The absorption capabilities of sateen fabrics are particularly impressive in the high-frequency ranges.
The double and triple layers of plain fabric, on the other hand, demonstrate high sound absorption results
at frequencies below 1000 Hz in comparison to sateen fabric
Anthropometry variation during resting positions adopted by bedridden and reduced mobility patients
No full textUsers with reduced mobility, who are bedridden or in wheelchairs for long periods, are prone to several
changes in the main human body systems. Clothing as an essential item for these users, will be in direct
contact with the skin, also for long periods. The adopted posture will influence the interaction with
clothing, and consequently, will have an effect on the body. Understanding these body changes, namely
the changes in anthropometric measurements according to the adopted posture, becomes relevant, given
the impact on total comfort, especially in its ergonomic variable. The objective of this study is to
identify, quantify and compare users body changes for the main resting positions adopted throughout
their day, as a condition of reduced mobility, in particular in the situation of lying down, in dorsal and/or
lateral decubitus, as well as the resting situation in the sitting position
Influence of stretching on liquid moisture transport in knitted fabrics
No full textMoisture management in clothing is defined as the transfer of moisture from human body to the
environment through the clothing [1]. Water vapour and liquid water (perspiration) need to get away
from the human body to outside to keep the body dry. This action should happen immediately to have
the maximal comfort of clothing usage. The aim of work was to investigate the liquid moisture transport
in the knitted fabrics for babies and children clothing. Three variants of fabrics were the objects of the
investigations. Measurement of the properties characterizing the liquid moisture transport in fabrics have
been performed by means of the M290 Moisture Management Tester (SDL Atlas) [1,2]. Fabrics were
tested in the relaxed and stretched state. Stretching of fabrics was realized by using the MMT Stretch
Fabric Fixture device [3]. The percentage of stretch was adjusted at 15 %. On the basis of the results the
knitted fabrics were compared in the aspect of their ability to ensure a physiological comfort. Influence
of stretching on the parameters characterizing the liquid moisture transport in the fabrics was statistically
analyzed and discussed
Exploration and practice of textile and clothing training base construction
No full textIn order to improve vocational education level of local economy. The textile and clothing training base
under Yueda Textile Industry Institute mode was built. The basic situation and construction ideas of the
base were sorted out, the construction contents of the productive practical training base were established,
the main measures of the base construction were defined, and the functions of the base in the aspects of
practical training topics, skill appraisal, talent cultivation and production practice were realized. Further
improved the technical promotion ability of the training base to serve the teachers and students,
enterprise employed and opened to the whole society. The construction of an open training base for
textile and garment skills would provide talent support and technical services for the development of
modern textile and garment industry
Influence of applied illuminance meter on the results of measurements of light intensity in the context of light pollution
No full textW artykule przedstawiono wyniki pomiarów natężenia
oświetlenia dla siedmiu typów luksomierzy z użyciem sześciu źródeł światła
o różnych wartościach temperatury barwowej najbliższej. Pomiary przeprowadzono
w punktach charakterystycznych przy ocenie immisji światła: 1 lx, 2 lx,
5 lx, 10 lx oraz 25 lx. Uzyskane wyniki jednoznacznie wskazują, że w przypadku
stałych warunków oświetlenia, dokładność pomiaru zależy od odpowiedniego
doboru przyrządu pomiarowego, w szczególności jego rozdzielczości. Nie bez
znaczenia pozostaje także charakterystyka widmowa promieniowania emitowanego
przez różne źródła światła.The article presents the results of illuminance measurements for
seven types of luxmeters using six light sources with different values of the
correlated color temperature. The measurements were carried out at the
characteristic points for the assessment of light immission: 1 lx, 2 lx, 5 lx, 10 lx
and 25 lx. The results clearly indicate that in the constant lighting conditions,
the accuracy of the measurement depends on the appropriate selection of the
measuring instrument, in particular its resolution. The spectral characteristics
of the radiation emitted by various light sources are also important
Simulation based development of profiled carbon rovings for concrete reinforcements
No full textTextile reinforcements are increasingly establishing their position in the building industry due to their
high tensile properties and corrosion resistance. However, in contrast to ribbed monolithic steel bars
with a defined form fit effect, the bond force of conventional carbon rovings are transmitted primarily
by an adhesive bond (material fit) between the textile surface and the surrounding concrete matrix.
Hence, relatively large bonding lengths are needed to transmit the bond forces, which results in an
inefficient material utilization. New solutions involving tetrahedral profiled rovings and braided yarns
promise significant improvements in the bonding behavior of textile reinforcements by creating an
additional mechanical interlock with the concrete matrix, yet maintaining the high tensile properties of
the carbon fibers. In order to increase the transmittable bond force and bond stiffness of the profiled
rovings through a defined roving geometry, a simulation-based development was conducted. Hereby
geometry and material models were developed and tensile tests as well as pull-out tests were simulated.
The results of simulation and characterization enable the optimization of the geometry parameters of the
tetrahedral profiled rovings and braided yarns to achieve better bond and tensile properties
Innovative single and bifurcated coronary stents: from braiding to flexibility
No full textIn this study, single and bifurcated coronary stent samples were fabricated nearly in real use sizes using
variation braiding technology. Fabrication methods of single and bifurcated coronary stents were
introduced and stent diameters, braiding angles, cover factors and flexibility properties of single stents
were evaluated according to their process parameters
Multilevel full factorial design in optimizing polymer type and blend ratio for PLA/PCL and PLLA/PCL electropsun webs
No full textBiopolymers have gained attention for tissue engineering researches in the last decade. Polycaprolactone(PCL), poly(lactic acid) (PLA), and poly(L-lactide) (PLLA) are highly popular biopolymers for scaffoldfabrication due to their biocompatibility and biodegradability. These polymers can be used as blend form to highlight their strengths such as morphological, mechanical, and biological. The blending ratio has an impact on the end product properties so, the structural features of the polymers like molecular weight and viscosity should be considered before surface development. In this study, electrospun fibroussurfaces with various ratios (10/90, 20/80, 30/70, 40/60, and 50/50) of PLA/PCL and PLLA/PCL blends are produced and the effect of polymer type as well as the blending ratio is examined. The findings of the fiber diameter research revealed that depending on the molecular weights of the polymers, the blend ratio has a statistically significant effect on fiber diameter
Natural dyeing of recycled cotton and polyester-cotton blended yarns with chitosan biomordant
Get PDFStudies on recycling and natural dyeing have gained great importance for the textile sector, which creates
the most pollution and causes significant problems. Chitosan and its forms with their versatile properties
are of great importance for many industrial areas from textiles to medicine. In this study, the effects of
different-molecular-weight-chitosans as biomordants on the natural dyeing of recycled cotton and
cotton-polyester yarns were investigated. The colorimetry results showed that while chitosan increased
the yellowness and chroma of the colors, it decreased their redness, it is caused the colors to shift towards
orange-yellow region. This change could be mitigated by changing the conditions under which the
dyeings were conducted. Medium molecular weight chitosan was more effective in these changes than
the low ones. Although there were changes in the angles of the colors, it was observed that the color
strengths increased with the rise of the chitosan concentration. Although higher color strengths were
obtained from dyes without chitosan, the increase in color depths with the increase of chitosan
concentration revealed that chitosan could be used as a mordant. The good washing fastness obtained
were explained by the low color strengths or the strong binding of chitosan and dye to the fiber