scholarly journals Impact of Repeated Home Laundering on the Cyclic Deformation Performance of Elastane Knitted Sportswear Fabrics

2019 ◽  
Vol 27 (1(133)) ◽  
pp. 91-99
Author(s):  
Vildan Sülar ◽  
Eren Oner
Keyword(s):  
Dimensional Stability ◽  
Cyclic Deformation ◽  
Recovery Time ◽  
Unit Area ◽  
Residual Deformation ◽  
Dimensional Change ◽  
Test Method ◽  
Knitted Fabrics ◽  
Minimum Deformation ◽  
Time Periods

After washing cycles, textiles having minimum deformation, maximum dimensional stability and the same performance of an unused product are major expectations of customers. This study examined the effects of washing cycles on the cyclic deformation of elastane knitted fabrics in detail. 12 knitted fabrics with two different linear densities of viscose yarn and three different polyamide/elastane gimped yarn of two different tightness levels (normal and tight) were used in the experiments. M&S P15A test method were used to evaluate the cyclic deformation of unwashed and washed fabrics (0, 5, 15 and 25 cycles) for four different recovery time periods (0 min, 2 min, 30 min and 24 h). Dimensional change, tightness factor and mass per unit area values were also examined in order to investigate the residual deformation of the fabrics after each washing stages. Consequently, it is determined that the fabrics having 21 tex viscose ground yarn and 78dtex20f elastane gimped yarn with higher setting show less residual extension (%). 5 and 15 washing cycles and a 30 min. recovery time are found significant for all repeated washings.

scholarly journals Effects of the Laundering Process on Dimensional and Physical Properties of Plain and Lacoste Fabrics Made from Modal/combed Cotton Blended Yarns

2017 ◽  
Vol 25 (0) ◽  
pp. 75-81 ◽  
Author(s):  
Ebru Çoruh
Keyword(s):  
Physical Properties ◽  
Dimensional Stability ◽  
Unit Area ◽  
Dimensional Change ◽  
Air Permeability ◽  
Knitted Fabrics ◽  
Bursting Strength ◽  
Expert Analysis ◽  
Fabric Weight ◽  
Loose Medium

In this study, dimensional and some physical properties of plain (single jersey) and lacoste knitted fabrics made from 50/50 modal/combed cotton blended yarns (tex 21 and 15) were investigated. Twelve weft knitted fabrics were produced with two different structures and three different densities (loose, medium, tight). For physical properties, the fabric weight per unit area, fabric thickness, bursting strength, air permeability and dimensional stability were evaluated. We focused on the dimensional stability properties of outwear knitted fabrics. The total dimensional change of the fabric’s dimensions and structural properties were measured and evaluated after ten washing cycles and then flat dried. The results show that the weight per unit area, thickness, air permeability and dimensional stability values are independent of the yarn linear density, fabric structure and fabric density. Statistically evaluated using Design Expert Analysis of variance (ANOVA) software 6.06., test results show that dimensional stability is mostly effective for the bursting strength, air permeability and fabric weight per unit area.

scholarly journals Wet Relaxation of Electrospun Nanofiber Mats

Technologies ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 23 ◽  
Author(s):  
Timo Grothe ◽  
Lilia Sabantina ◽  
Michaela Klöcker ◽  
Irén Junger ◽  
Christoph Döpke ◽  
...  
Keyword(s):  
Dimensional Stability ◽  
Pure Water ◽  
Dimensional Change ◽  
Solid Content ◽  
Relaxation Processes ◽  
Knitted Fabrics ◽  
Nanofiber Mats ◽  
Mat Thickness ◽  
Solution Parameters ◽  
Pan Nanofiber

Electrospinning can be used to produce nanofiber mats. One of the often used polymers for electrospinning is polyacrylonitrile (PAN), especially for the production of carbon nanofibers, but also for a diverse number of other applications. For some of these applications—e.g., creation of nano-filters—the dimensional stability of the nanofiber mats is crucial. While relaxation processes—especially dry, wet and washing relaxation—are well-known and often investigated for knitted fabrics, the dimensional stability of nanofiber mats has not yet been investigated. Here we report on the wet relaxation of PAN nanofiber mats, which are dependent on spinning and solution parameters such as: voltage, electrode distance, nanofiber mat thickness, and solid content in the solution. Our results show that wet relaxation has a significant effect on the samples, resulting in a dimensional change that has to be taken into account for nanofiber mats in wet applications. While the first and second soaking in pure water resulted in an increase of the nanofiber mat area up to approximately 5%, the dried sample, after the second soaking, conversely showed an area reduced by a maximum of 5%. For soaking in soap water, small areal decreases between approximately 1–4% were measured.

scholarly journals Elastomeric Impression Materials: A Comparison of Accuracy of Multiple Pours

2011 ◽  
Vol 12 (4) ◽  
pp. 272-278 ◽  
Author(s):  
Dheeraj Kumar ◽  
Anand U Madihalli ◽  
K Rajeev Kumar Reddy ◽  
Namrataa Rastogi ◽  
NT Pradeep
Keyword(s):  
Clinical Significance ◽  
Dimensional Stability ◽  
Central Hole ◽  
Central Incisor ◽  
Impression Material ◽  
Maxillary Central Incisor ◽  
Dimensional Changes ◽  
The Third ◽  
Impression Materials ◽  
Time Periods

ABSTRACT Aim The aim of the present study is to compare the various elastomeric impression materials in terms of accuracy and dimensional stability, with respect to obtaining multiple casts from a single elastomeric impression at various times of pours. Materials and methods Three master dies were prepared for the impression making, two of these were made of brass containing a central hole with undercuts. The third die simulated a conventionally prepared typodont maxillary central incisor. Three elastomeric impression materials were chosen for the study. Each impression was poured at various time periods. Casts thus obtained were evaluated under a traveling microscope to evaluate various dimensional changes. Results Addition silicones provided dies which were shorter in height and bigger in diameter. Polyethers provided dies which were shorter in both height and diameter. Condensation silicones showed insignificant changes from the master die at the immediate pour but deteriorated rapidly after that in subsequent pours. Conclusion None of the impression material showed a consistent behavior up to the fourth pour. They occasionally showed deviation from the pattern, but all these values were statistically insignificant. Polyethers showed lesser ability than both the addition silicones as well as the condensation silicones to recover from induced deformation. Clinical significance Addition silicones as well as the condensation silicones have better ability to recover from induced deformation when compared to polyether. How to cite this article Kumar D, Madihalli AU, Reddy KRK, Rastogi N, Pradeep NT. Elastomeric Impression Materials: A Comparison of Accuracy of Multiple Pours. J Contemp Dent Pract 2011;12(4):272-278.

Dynamic moisture sorption and dimensional stability of furfurylated wood with low lignin content

Holzforschung ◽  
2019 ◽  
Vol 74 (1) ◽  
pp. 68-76
Author(s):  
Tiantian Yang ◽  
Erni Ma ◽  
Jinzhen Cao
Keyword(s):  
Relative Humidity ◽  
Dimensional Stability ◽  
Furfuryl Alcohol ◽  
Lignin Content ◽  
Moisture Sorption ◽  
Dimensional Change ◽  
Poplar Wood ◽  
Sorption Coefficient ◽  
Dimensional Changes ◽  
Sinusoidal Shape

AbstractDegradation of lignin occurs naturally in wood due to the influence of microorganisms or photic radiation. To improve the properties of wood with low lignin content, furfuryl alcohol (FA) at the concentration of 25% was used to modify poplar wood (Populus euramericana Cv.) after partial delignification. Moisture sorption and dimensional stability of the samples were investigated under dynamic conditions where the relative humidity (RH) was changed sinusoidally between 45% and 75% at 25°C. Both the moisture content (MC) and the tangential dimensional change varied with a sinusoidal shape similar to the RH. Hygroscopicity and hygroexpansion increased after delignification, while furfurylation led to an inverse impact by reducing MC, dimensional changes, amplitudes of MC and dimensional changes, moisture sorption coefficient (MSC), and humidity expansion coefficient (HEC). After delignification and further furfurylation, the MC and the dimensional changes were reduced by about 20%, and the maximum drop in amplitudes of MC and dimensional changes was about 30%, while the MSC and the HEC decreased by over 15%. In addition, the furfurylated wood with low lignin content exhibited lower sorption hysteresis and swelling hysteresis.

scholarly journals Changes of the Knitted Fabric Properties due to Exposure to Outdoor Natural Weathering

2014 ◽  
Vol 9 (4) ◽  
pp. 155892501400900
Author(s):  
Ivana Salopek Cubric ◽  
Vesna Marija Potocic Matkovic ◽  
Zenun Skenderi
Keyword(s):  
Heat Resistance ◽  
Unit Area ◽  
Raw Materials ◽  
Weather Conditions ◽  
Natural Weathering ◽  
Knitted Fabric ◽  
Summer Period ◽  
Knitted Fabrics ◽  
Vertical Density ◽  
Single Jersey

In order to investigate the changes of knitted fabric properties due to exposure to outdoor natural weathering, a series of single jersey fabrics made from different raw materials was produced. The fabrics were exposed to summer weather conditions in duration of three months. The exposure of knitted fabrics to outdoor natural weathering in the summer period affected all investigated properties, namely, structural properties, tensile properties and heat resistance. The most significant changes were: the vertical density increased up to 31%, the mass per unit area increased up to 26%, the breaking force decreased in both directions for up to 54% and the heat resistance decreased up to 18%.

The Effect of Heat-Setting Conditions on the Performance Characteristics of Warp Knitted Spacer Fabrics

2016 ◽  
Vol 11 (3) ◽  
pp. 155892501601100 ◽  
Author(s):  
Gözde Ertekin ◽  
Arzu Marmarali
Keyword(s):  
Closed Form ◽  
Dimensional Stability ◽  
Unit Area ◽  
Air Permeability ◽  
Performance Characteristics ◽  
Surface Layers ◽  
Heat Setting ◽  
Compression Set ◽  
Setting Process ◽  
Spacer Fabrics

Spacer fabrics can be produced by using weaving or nonwoven techniques besides warp and weft knitting processes. Warp knitted spacer fabrics are produced by using polyester multifilament and monofilament yarns for surface layers and spacer yarn, respectively. After knitting process, surface layers of these fabrics are in the closed form. Then these fabrics are subjected to a heat-setting treatment in order to increase their structural stability and to achieve an open form with holes. In this study, it is aimed to investigate the effect of heat-setting conditions on the performance characteristics of the warp knitted spacer fabrics. Mass per unit area, thickness, air permeability, compressibility, dimensional stability and compression set properties were measured and evaluated statistically in order to determine the effects of heat-setting conditions such as temperature, duration of heat-setting and stretching (the tension applied to the samples during heat-setting) on the performance characteristics. The results revealed that, heat-setting process has significant effect on all measured performance characteristics of the samples. After heat-setting process, air permeability and compressibility values increases while mass per unit area and compression set values decreases.

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