Study on the Structure and Property of Ultra-Fine Denier PET Full Drawing Yarn: Effect of Draw Ratio and Take-Up Velocity

2011 ◽  
Vol 217-218 ◽  
pp. 377-382
Author(s):  
Feng Lei Shen ◽  
Guo Qiang Chen ◽  
Jiang Zhong Ding ◽  
Ju Yan Dai ◽  
Xiu Feng Yu
Keyword(s):  
Mechanical Properties ◽  
Crystalline Structure ◽  
Draw Ratio ◽  
Linear Density ◽  
Molecular Chain ◽  
Boiling Water ◽  
Crystalline Size ◽  
Sonic Velocity ◽  
Structure And Property ◽  
Xrd Method

The effect of draw ratio and take-up velocity on the structure and property of the ultra-fine denier PET full drawing yarn (PET-FDY) with monofilament linear density equal to 0.38dTex was studied in this paper. The crystalline structure and crystalline size were determined by XRD method and size was reduced with increase of draw ratio. The orientation of whole molecular chain was determined using sonic velocity method. The mechanical properties and boiling water shrinkage were also examined. Draw ratio had greater influence on the boiling water shrinkage than take-up velocity did.

The Structure and Property of Akund

2019 ◽  
Vol 793 ◽  
pp. 59-63
Author(s):  
Wei Dong Li ◽  
Xuan Li ◽  
Ming Hui Xu
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Thermal Behavior ◽  
Crystalline Structure ◽  
Xrd Analysis ◽  
Cotton Fibers ◽  
Moisture Regain ◽  
Structure And Property ◽  
Ft Ir

The morphology, microfiber structure, crystalline structure, mechanical properties and thermal behavior of the Akund were studied with SEM, FT-IR, TG and XRD analysis, and compared with cotton fibers. Its mechanical properties, moisture content and moisture regain were tested, and its solubility was analyzed in different solutions.

Effect of Heat-Setting Temperature on the Structure and Performance of Ultra-Fine Denier PET Full Drawing Yarn

2011 ◽  
Vol 197-198 ◽  
pp. 1276-1280 ◽  
Author(s):  
Feng Lei Shen ◽  
Guo Qiang Chen ◽  
Jiang Zhong Ding ◽  
Ju Yan Dai
Keyword(s):  
Mechanical Properties ◽  
Tensile Stress ◽  
Crystallite Size ◽  
Crystal Orientation ◽  
Linear Density ◽  
Boiling Water ◽  
Orientation Factor ◽  
Drawing Process ◽  
Heat Setting ◽  
And Performance

The ultra-fine denier PET full drawing yarn (PET-FDY) with monofilament linear density equal to 0.38dTex was produced. During the practical process of ultrafine denier PET-FDY, the yarn should be heat-set at certain temperature following the drawing process in order to improve the mechanical properties and reduce the boiling water shrinkage. The influence of heat-setting temperature on the structure and performance of ultra-fine denier PET FDY was studied in this paper. With heat-setting temperature increasing, crystalline in PET FDY became perfect and crystallite size became bigger. According to the density method, crystallinity was augmented. Crystal orientation factor and overall orientation factor were both increased. The tenacity and tensile stress at 10% strain of PET FDY were increased and the breakage percentage and boiling water shrinkage were reduced with the heat-setting temperature increasing.

The Effect of Yarn Linear Density on Mechanical Properties of Plain Woven Kenaf Reinforced Unsaturated Polyester Composite

2013 ◽  
Vol 465-466 ◽  
pp. 962-966 ◽  
Author(s):  
Mohd Pahmi bin Saiman ◽  
Mohd Saidin Bin Wahab ◽  
Mat Uzir Wahit
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Linear Density ◽  
Unsaturated Polyester ◽  
Composite Panel ◽  
Composite Yarn ◽  
Polyester Composite ◽  
The Impact ◽  
Woven Kenaf

To produce a good quality of dry fabric for reinforced material in a natural-based polymer composite, yarn linear density should be in consideration. A woven kenaf dry fabric with three different linear densities of 276tex, 413.4tex and 759tex were produced. The fabrics with different linear densities were been optimize with the assistance of WiseTex software. The optimized dry fabrics were infused with unsaturated polyester to produce composite panel using vacuum infusion process. The composites properties were tested on the tensile strength, flexural strength and the impact strength. The result shows that the mechanical properties of the composite increased when the yarn linear densities increased.

Influence of alumina whisker or nano-carbon contents on the microstructure and mechanical properties of CuZrTiAlNi refractory high entropy alloy composites

2020 ◽  
Vol 62 (7) ◽  
pp. 678-688
Author(s):  
X. Jiang ◽  
J. Chen ◽  
H. Sun ◽  
Z. Shao
Keyword(s):  
Mechanical Properties ◽  
Load Transfer ◽  
Microwave Sintering ◽  
Fracture Morphology ◽  
Strengthening Mechanism ◽  
Cold Isostatic Pressing ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Structure And Property ◽  
Fine Grain

Abstract High-entropy alloy composites were fabricated by ball milling, cold isostatic pressing and microwave sintering to which were added varied contents of Al2O3 whiskers, La-Ce, and carbon nanotubes-graphene, respectively. The structure and mechanical properties of the composites were investigated by X-ray diffraction, scanning electron microscopy and a microhardness tester. The high-entropy alloy and composites show amorphous phases and some crystalline phases. Accordingly, the addition of the reinforcement phase can refine the grain size. The formation mechanism of the phase is mainly related to the factors of mixing entropy, enthalpy, differences in atomic size, and the structure and property of the elements. The hardness of the composites is higher than that of the alloy (437.5 HV), and those composites reinforced by 0.5 wt.-% nanotubes- 0.5 wt.-% graphene are the highest (593.99 HV). The fracture morphology of the Al2O3 whisker reinforced composite shows a river pattern, indicating brittle cleavage. According to the research results, it can be concluded that the strengthening mechanism of the high entropy alloy composites mainly reflects fine grain strengthening and load transfer, and the toughening mechanism mainly crack bridging and a pulling out of the reinforcing phase.

ARAMID–NYLON 6.6 HYBRID CORDS AND INVESTIGATION OF THEIR PROPERTIES

2012 ◽  
Vol 85 (2) ◽  
pp. 180-194 ◽  
Author(s):  
Berrin Yilmaz
Keyword(s):  
Mechanical Properties ◽  
Linear Density ◽  
Thermally Stable ◽  
High Modulus ◽  
Synthetic Yarn ◽  
Product Property ◽  
High Fatigue ◽  
High Elongation ◽  
Low Modulus ◽  
Twist Level

Abstract Hybrid cords of two different polyamide yarns, poly(p-phenylene terephthalamide; aramid) and poly(hexamethylene adipamide; nylon 6.6) have been investigated. Aramid is a high-tenacity, high-modulus, low-elongation, and thermally stable yarn material. Nylon 6.6 is a high-elongation, low-modulus, high-fatigue-resistant, and good adhering synthetic yarn. The combination of these two different synthetic yarns enables hybrid cords with a diversified range of mechanical properties. The hybrid cord product property diversification is achieved by proper combination of different cord-forming properties of individual plies, such as linear densities, twist levels, ply numbers, treating conditions, and so forth. The effect of linear densities, twist level of plies, and twist level of cabled cord and ply number on the cord properties and also cord performance have been summarized. Aramid yarn having an 1100 linear density has been combined with nylon 6.6 yarn with a different linear density, ranging from 940 to 2100, to form hybrid cord structures. Twisting of aramid and nylon 6.6 yarns has been kept between 150 and 450 twists per meter, while the ply number of aramid and nylon 6.6 yarns has been varied as one and two plies by keeping the total ply number of the cord as three.

Influences of melt-draw ratio and annealing on the crystalline structure and orientation of poly(4-methyl-1-pentene) casting films

RSC Advances ◽  
2016 ◽  
Vol 6 (67) ◽  
pp. 62038-62044 ◽  
Author(s):  
Ai-ping Ma ◽  
Li-yang Xu ◽  
Bo Yin ◽  
Ming-bo Yang ◽  
Bang-hu Xie
Keyword(s):  
Crystalline Structure ◽  
Lamellar Structure ◽  
Draw Ratio ◽  
Slit Die

Poly(4-methyl-1-pentene) casting films with a row-nucleated lamellar structure were extruded through a slit die followed by stretching using a chill roll.

Strain Electrometry Studies of Aluminum

CORROSION ◽  
1970 ◽  
Vol 26 (3) ◽  
pp. 99-104 ◽  
Author(s):  
HENRY LEIDHEISER ◽  
ELSIE KELLERMAN
Keyword(s):  
Mechanical Properties ◽  
Steady State ◽  
Ionic Strength ◽  
Dissolved Oxygen ◽  
Stress Corrosion ◽  
Stress Corrosion Crack ◽  
Boiling Water ◽  
Sodium Tartrate ◽  
Rate Of Decay

Abstract The potential of aluminum wires immersed in an electrolyte was followed after abrupt straining of 1.5–12%. The maximum potential achieved after straining in 0.1M NaCl decreased with decrease in pH and the rate of decay to the initial steady-state value was independent of pH over the range of 1.5–6.5. The presence of dissolved oxygen in the solution increased the rate of decay to the steady-state value. The different potential behavior of untreated wires, wires heated in boiling water, and anodized wires was attributed to different mechanical properties of the oxide. The strain electrometry curves were identical in solutions of NaCl, Na2SO4, sodium tartrate, and Na2Cr2O7 of equal ionic strength. The pertinence of the results to the behavior of aluminum exposed at the tip of a growing stress corrosion crack is discussed.

Modification of Cotton Yarns for Smart Socks Production

2019 ◽  
Vol 800 ◽  
pp. 331-335
Author(s):  
Ieva Bake ◽  
Vineta Afanasjeva ◽  
Silvija Kukle
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Linear Density ◽  
Sol Gel ◽  
Antimicrobial Properties ◽  
Mean Value ◽  
Cotton Yarn ◽  
Yarn Strength ◽  
Prototype Development ◽  
Cotton Yarns

The functionality of textiles can be complimented by using a wide variety of modification technologies. This study focuses on textile modification with sol-gel technology as a part of smart sock prototype development. Zinc acetate dehydrate (ZAD) is integrated in sol synthesis and used as modifier thus improving modified cotton yarn mechanical properties and also can prolong time between washing, taking into account modifiers antimicrobial properties. Four hanks of pure cotton yarns with length of 300 m, where modified with silica-based sol with 7,5 wt% ZAD as a modifier. As a part of this study tensile strength and elongation of yarn was determined and changes in liner density were observed. Average yarn linear density increases by 19 % and linear density for knitted samples increases by 2,6 %. Therefore, yarn strength for 80 % of modified samples shows mean value of 2,32 N, that is 17 % higher than unmodified samples.

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