scholarly journals Manufacture and Property of Warp-Knitted Fabrics with Polylactic Acid Multifilament

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 65 ◽  
Author(s):  
Tong Yang ◽  
Wei Zhou ◽  
Pibo Ma
Keyword(s):  
Polylactic Acid ◽  
Breaking Strength ◽  
Knitted Fabric ◽  
Knitted Fabrics ◽  
Elongation At Break ◽  
Dyeing Process ◽  
Before And After ◽  
Warp Knitted Fabric ◽  
Different Diameters ◽  
Excellent Color

This study investigates the properties of polylactic acid (PLA) multifilament and its warp-knitted fabrics. Multifilament properties were tested and compared with PET multifilament with different diameters. The 83.3 dtex PLA multifilament was used to knit the fabric, and the fabric properties before and after dyeing were studied. Results showed that the mechanical properties of PLA multifilament were comparable to those of PET. However, PLA had a higher heat shrinkage rate. The dyed PLA warp-knitted fabric has excellent color fastness. Due to the influence of temperature and dye particles during the dyeing process, the breaking strength, air permeability and moisture permeability of the fabric were decreased. On the contrary, the elongation at break, abrasion resistance, anti-pilling properties, drape and crochet value of the fabric were increased.

Investigation of the Two-Bar Warp-Knitted Fabric Structure Effect on Luster Value

2014 ◽  
Vol 9 (2) ◽  
pp. 155892501400900
Author(s):  
Saeed Ajeli ◽  
Zoleykhah Ahmadvand
Keyword(s):  
Diffuse Reflection ◽  
Specular Reflection ◽  
Knitted Fabric ◽  
Knitted Fabrics ◽  
Fabric Structure ◽  
Measuring Surface ◽  
Before And After ◽  
Dark Color ◽  
Points Of View ◽  
Warp Knitted Fabric

Consumer points of view determine economical value of fabrics. Fabric luster plays a momentous role in attracting people's attention, especially for clothing and domestic purposes. Luster is defined by intensity of both specular and diffuse light reflection off of a surface. There are various methods for measuring surface luster. Gloss. Luster is described as the ratio of specular reflection in one angle to diffuse reflection in another angle. Two-bar warp knitted polyester fabrics such as Tricot, Locknit, Satin, reverse Locknit and Sharkskin in three different densities were provided. A mini gloss apparatus was applied to measure fabric specular reflection in the angle of sixty degrees, before and after disperse dying with different colors of white, blue and yellow. Results suggest that luster is a function of knitted fabric type, color and density. Enhancement of technical back luster resulted from longer underlap of the front bar. However, it did not change the technical face luster significantly. Density increased in all knitted fabrics and caused the luster to decrease. Dark color fabrics showed lower luster compared to light ones.

Mechanical Response and Damage Analysis of 3D Multi-Structured Knitted Composite under Quasi-Tensile Loadings

2012 ◽  
Vol 476-478 ◽  
pp. 767-770
Author(s):  
Xi Wen Jia ◽  
Jia Zhi Su ◽  
Yi Zhu Zheng ◽  
Bo Hong Gu ◽  
Bao Zhong Sun
Keyword(s):  
Composite System ◽  
Mechanical Response ◽  
Strain Curve ◽  
Damage Mechanism ◽  
Core Material ◽  
Knitted Fabric ◽  
Knitted Fabrics ◽  
Initiation And Propagation ◽  
Damaged Zone ◽  
Warp Knitted Fabric

The mechanical response and damage mechanism of a 3D multi-structured knitted composite under quasi-tensile loadings are investigated based on experimental results. The multi-structured knitted composite consists of two knitted fabrics with weft double-faced interlock knitted fabric as core material and biaxial warp-knitted fabric as surface layer in the above-mentioned composite system, respectively. The tensile stress against strain curve is obtained to analyze the mechanical behavior. Furthermore, the failure mechanisms of 3D multi-structured knitted composite are discussed from the experimental observations by the initiation and propagation of damaged zone in knitted composites.

Modification of Rabbit Yarn by Milk Protein Grafting and Cross-Linking

2015 ◽  
Vol 10 (4) ◽  
pp. 155892501501000
Author(s):  
Li Jiali ◽  
Zhang Tonghua ◽  
Cheng Lan ◽  
Guo Min
Keyword(s):  
Milk Protein ◽  
Breaking Strength ◽  
Fiber Surface ◽  
Cross Linking ◽  
Knitted Fabric ◽  
Grafting Ratio ◽  
Locus Method ◽  
Graft Modification ◽  
Before And After ◽  
Friction Performance

Rabbit yarn was treated by milk protein grafting and cross-linking to improve its abrasion resistance performance and breaking strength. Grafting ratio and washing fastness of the rabbit yarn after graft modification were tested. The surface morphology of the rabbit yarn before and after graft modification was observed by a scanning electron microscope(SEM). The mechanical properties and friction performances of the treated and untreated rabbit yarns were also tested. The treated yarns were utilized to design and weave rabbit hair-knitted fabric. The anti-pilling resistance of the rabbit hair-knitted fabric was tested by circular locus method; the pills were then counted and weighed. The stiffness of the fabric was observed. Results showed that milk protein could obviously be grafted on the fiber surface, resulting in a rougher surface of the treated fabric than that of the untreated ones. The average grafting ratio is 3.701%. The protein retention ratio of the rabbit yarn treated by milk protein grafting and cross-linking is 99.312%. The breaking strength of the rabbit yarn was enhanced and friction performance improved significantly after treatment. The pilling grade of the fabric significantly improved and the stiffness of the fabric was reduced.

Thermal resistance of polyurethane-coated knitted fabrics before and after weathering

2014 ◽  
Vol 84 (19) ◽  
pp. 2015-2025 ◽  
Author(s):  
Vesna Marija Potočić Matković ◽  
Ivana Salopek Čubrić ◽  
Zenun Skenderi
Keyword(s):  
Thermal Resistance ◽  
Thermal Protection ◽  
Winter Season ◽  
Outdoor Exposure ◽  
Woven Fabrics ◽  
Knitted Fabric ◽  
Knitted Fabrics ◽  
Coated Fabric ◽  
Before And After ◽  
Coated Fabrics

Polyurethane-coated knitted fabrics are of interest because they exhibit several positive properties, they are more stretchable, elastic and comfortable than coated woven fabrics and yet they are little studied. Information of weather durability, as well as thermal properties, is essential to ensure thermal protection for textile materials intended for outdoor use. In the presented research, a series of coated knitted fabrics for protective clothing were developed and exposed to weathering in summer and winter seasons. After three months of outdoor exposure, thermal resistance of all the tested materials decreased by 13% after the summer season and 25% after the winter season. A very good correlation of knitted fabric mass per unit area and thermal resistance of knitted fabric, coated fabric and aged coated fabric occurred. The studied materials experienced a partial degradation of the polyurethane layer, which is not related to the deterioration of the knitted substrate. The presented investigation of thermal resistance of coated fabrics and their dependence on the knitted substrate, as well as the influence of environmental conditions, allows the improvement of coated fabrics with the aim of better thermal protection.

Comparison of methods for measurement of the pressure exerted by knitted fabrics

2016 ◽  
Vol 87 (17) ◽  
pp. 2117-2126 ◽  
Author(s):  
Małgorzata Cieślak ◽  
Agnieszka Karaszewska ◽  
Ewa Gromadzińska ◽  
Izabela Jasińska ◽  
Irena Kamińska
Keyword(s):  
In Vitro Tests ◽  
Knitted Fabric ◽  
In Vitro Test ◽  
Knitted Fabrics ◽  
Weft Knitted Fabric ◽  
In Vivo Tests ◽  
Vitro Test ◽  
Warp Knitted Fabric

The article presents the results of measurements of pressure exerted by two model knitted products – bands with different structure (WI jersey weft-knitted fabric and WII openwork warp-knitted fabric). The tests were carried out with using the I-Scan system (in vivo and in vitro tests) and the STM 579 device (in vitro test). A comparative analysis of the in vivo and in vitro results for the I-Scan method and in vitro results for the I-Scan and STM 579 method was performed. It was found that the pressure values are lower for openwork warp-knitted fabric than for jersey weft-knitted fabric both in the case of the in vitro and in vivo tests, and the values of pressure for the same band are higher in the case of the in vitro tests.

The Axial Warp-Knitted Fabric and its Reinforced Composite

2011 ◽  
Vol 332-334 ◽  
pp. 837-840
Author(s):  
Yi Hua Bu ◽  
Yan Feng ◽  
Hua Wu Liu
Keyword(s):  
Mechanical Properties ◽  
Woven Fabrics ◽  
Advanced Materials ◽  
Knitted Fabric ◽  
Knitted Fabrics ◽  
Unique Structure ◽  
Reinforced Composite ◽  
And Performance ◽  
Warp Knitted Fabric ◽  
Composite Reinforcement

The structure and performance of the axial warp-knitted composite were introduced, including bi-axial and multi-axial organizations. According to the unique structure of this fabric, the mechanical properties and the advantages as a composite reinforcement were compared with regular staple woven fabrics. The advantages of composites reinforced by bi-axial and multi-axial knitted fabrics were discussed and the applications of such advanced materials were briefly presented.

Pilot Study of PET/Bamboo Charcoal Warp-Knitted Fabric

2012 ◽  
Vol 184-185 ◽  
pp. 1090-1093 ◽  
Author(s):  
Jia Horng Lin ◽  
Ching Wen Lin ◽  
Chin Mei Lin ◽  
Yi Chang Yang ◽  
Ting Ting Li ◽  
...  
Keyword(s):  
Far Infrared ◽  
Air Permeability ◽  
Weft Yarn ◽  
Knitted Fabric ◽  
Bamboo Charcoal ◽  
Health It ◽  
Warp Yarn ◽  
Knitted Fabrics ◽  
Far Infrared Ray ◽  
Warp Knitted Fabric

In recent years, as improvement of human living life, people begin to focus on themselves health. It is certain that bamboo charcoal has many properties, including water purification, deodorization, anion release and far-infrared ray radiation. This study aims to prepare PET/BC warp-knitted fabric composed of polyester yarn (PET) as warp yarn and bamboo charcoal polyamine yarn (BC) as weft yarn using Velcro Crochet Machine. Afterwards, air permeability, elastic resilience and far-infrared ray emissivity of resulting knitted fabric were discussed by changing weft yarn type. Result shows that, for knitted fabrics, weft yarn type cannot affect the elastic resilience; yet PET weft yarn makes air permeability decreasing.

scholarly journals The Comfort Properties of Two Differential-Shrinkage Polyester Warp Knitted Fabrics

2016 ◽  
Vol 16 (2) ◽  
pp. 90-99 ◽  
Author(s):  
Qing Chen ◽  
Xuhong Miao ◽  
Haiwen Mao ◽  
Pibo Ma ◽  
Gaoming Jiang
Keyword(s):  
Evaluation System ◽  
Subjective Evaluation ◽  
Knitted Fabric ◽  
Polyester Yarn ◽  
Mechanical Pressure ◽  
Knitted Fabrics ◽  
Vapour Permeability ◽  
Fabric Handle ◽  
Differential Shrinkage ◽  
Warp Knitted Fabric

AbstractSingle-layered warp knitted fabrics were produced by the 60D/36F (containing 36 filaments) polyester yarn with differential shrinkage (DS) property in this study. Due to the differential shrinkage property, the fabric becomes curly and bulkier, simulating cotton fabric in terms of its appearance and fabric handle. The performance and appearance of these DS polyester warp knitted fabrics were evaluated objectively and subjectively. The testing results demonstrated that the DS polyester warp knitted fabric had better abrasion property, worse pilling resistance due to the mechanical property of polyester yarn when compared with 100% cotton warp knitted fabric. Meanwhile, lower water vapour permeability and air resistance were found for DS polyester warp knitted fabric resulting from the dense structure of yarn shrinkage after heat-moisture treatment. Besides, the fabric handle was evaluated by Kawabata evaluation system and subject to trial under dry and wet fabric condition. DS polyester warp knitted fabrics provide better recovery under low stress mechanical pressure. The subjective evaluation result shows that the warp knitted fabrics made of DS polyester had similar handle against cotton warp knitted fabric in terms of prickle, smooth, comfort and dry feeling in both dry and wet testing conditions.

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