Improving fiber trapping with a contact surface during the ring twisting of two cotton yarns

2012 ◽  
Vol 82 (3) ◽  
pp. 272-279 ◽  
Author(s):  
Zhigang Xia ◽  
Weilin Xu ◽  
Xungai Wang
Keyword(s):  
Contact Surface ◽  
Plane Surface ◽  
Geometrical Model ◽  
Variation Analysis ◽  
Significance Level ◽  
Yarn Properties ◽  
Cotton Yarns ◽  
Grooved Surface ◽  
Yarn Hairiness ◽  
Plied Yarn

In this study, a geometrical model was introduced to improve the hair trapping via a surface contacting the yarn-twisting triangle during ring twisting of two single yarns. The fiber-trapping improvement with the contact surface was analyzed theoretically. Then, single Ne 80 ring cotton yarns were used to produce two-ply yarns under different ring-twisting conditions, namely conventional twisting, dry twisting of yarns with a plane surface, wet twisting of yarns with a plane surface, dry twisting of yarns with a grooved surface, and wet twisting of yarns with a grooved surface. Plied yarn properties, including yarn hairiness, strength, and irregularity, were tested. The Student Newman Keuls (SNK) test and variation analysis were also carried out in the SPSS program to study the effect of different contact surfaces on related yarn properties; the significance level was 0.05 for the SNK test and variation analysis. The hairiness of plied yarns was significantly reduced when twisting with the plane or grooved surface, especially for the wet twisting cases. This corresponds well with our model on improving fiber trapping.

Comparative study of ring yarn properties spun with static and rotary grooved contact surfaces

2017 ◽  
Vol 88 (16) ◽  
pp. 1812-1823 ◽  
Author(s):  
Hao Yu ◽  
Keshuai Liu ◽  
Chen Jun ◽  
Chiyu Fu ◽  
Zhigang Xia ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Contact Surface ◽  
Surface Friction ◽  
Significant Deterioration ◽  
Spun Yarn ◽  
Yarn Properties ◽  
Static Contact ◽  
Ring Spun Yarn ◽  
Grooved Surface ◽  
Yarn Hairiness

Spinning with a static contact surface is an energy-saving method to reduce spun yarn hairiness; however, the spun yarn irregularity and tensile properties are deteriorated. To prohibit the deteriorations, this paper introduces a rotary grooved surface contacting ring spinning strand within the yarn formation zone. In theory, the modeling analysis of spinning with contact surface is conducted to reveal the prohibition mechanism of yarn irregularity and tensile property deteriorations for a rotary grooved surface. Theoretical analysis results indicated that groove-yarn surface friction could wrap the concentrated hairs onto yarn stem while block inflowing twists to the spinning strangle zone; the rotary grooved surface could reduce twist blockage and hair wrapping concentrations to better the situation after a comparison with the static grooved surface. Then, two kinds of specially-designed grooved cylinders (one was rotatable while the other was static) were used to validate the theoretical analysis. The experimental results showed that, unlike the static grooved cylinder which significantly deteriorated the original yarn unevenness CVm, the rotary achieved significant hairiness reduction without any significant deterioration of other yarn properties. This might be due to the decreased friction and twist propagation for the rotary grooved cylinder contacting the spinning strand. In this case, spinning with a rotary grooved cylinder was preferably applied in the first step to control ring spun yarn hairiness.

Improving spun yarn properties by contacting the spinning strand with the static rod and self-adjustable disk surfaces

2017 ◽  
Vol 88 (7) ◽  
pp. 800-811 ◽  
Author(s):  
Keshuai Liu ◽  
Zhigang Xia ◽  
Weilin Xu ◽  
Yu Hao ◽  
Qiaolin Xu ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Contact Surface ◽  
Ring Spinning ◽  
Modified Method ◽  
Spun Yarn ◽  
Yarn Properties ◽  
Static Contact ◽  
Yarn Hairiness ◽  
Yarn Tenacity ◽  
Good Agreement

To overcome the spun yarn unevenness deterioration and insufficient hairiness reduction for ring spinning with a static contact surface, this study introduced a modified method to improve spun yarn properties by contacting the spinning strand with the static rod and self-adjustable disk surfaces. The mechanism of the improvement of spun yarn properties was theoretically analyzed. Analysis results indicated that the combination of the static rod and self-adjustable disk surfaces could improve the yarn hairiness wrapping force without sever twisting blockage, resulting in a large yarn hairiness reduction and surface tight structure without irregularity deterioration. Correspondingly, the yarn tenacity should also become somewhat enhancement. Then, our theoretical analysis and prediction were validated by conducting such comparative experiments as spinning without a contact surface, spinning with a static rod surface, and spinning with a combination of the static rod and self-adjustable disk surfaces. The experimental results were in good agreement with our theoretical analysis and prediction.

Comparative Evaluation of Yarn Hairiness by Different Methods

1988 ◽  
Vol 58 (8) ◽  
pp. 477-479 ◽  
Author(s):  
G. Viswanathan ◽  
V. G. Munshi ◽  
A. V. Ukidve ◽  
K. Chandran
Keyword(s):  
Comparative Evaluation ◽  
Statistical Distribution ◽  
The Other ◽  
Hair Length ◽  
Cotton Yarns ◽  
Yarn Hairiness

Using a rapid yarn hairiness tester, the Shirley yarn hairiness meter, this work has confirmed that for cotton yarns, the statistical distribution of the number of protruding ends of different lengths is exponential. The study indicates that, compared to the other hair length settings available on the hairiness meter, the recommended 3 mm hair length is suitable and advantageous. Further there is a high correlation between the Shirley hairiness meter and two other hairiness indices, the modified Jedryka and the Digital fibrograph, considered in this work.

Reducing Yarn Hairiness in a Modified Ring Spinning Yarn Path by Various Offsets

2011 ◽  
Vol 331 ◽  
pp. 493-497
Author(s):  
Xu Zhong Su ◽  
Wei Dong Gao ◽  
Ting Ting Wu ◽  
Xin Jin Liu ◽  
Yun Zhang
Keyword(s):  
Critical Region ◽  
Breaking Force ◽  
Ring Spinning ◽  
Fiber Tension ◽  
Yarn Properties ◽  
Spun Yarns ◽  
Spinning Process ◽  
Spinning Triangle ◽  
Yarn Hairiness ◽  
The Right

Spinning triangle is a critical region in the spinning process of yarn. Its geometry influences the distribution of fiber tension in the spinning triangle and the properties of spun yarns, such as the yarn breakage and hairiness. In this paper, the relationships between the spinning angle and yarn properties especially the yarn hairiness were investigated under various horizontal offsets. The properties of spun yarns produced by the modified system were evaluated and analyzed. Both left diagonal and right diagonal yarn arrangements were examined. The results indicate that the right diagonal yarn path leads to reduce yarn hairiness but the left diagonal yarn path leads to increase yarn hairiness; the breaking force of yarn changes little; yarn evenness deteriorates slightly with the changes of offset.

Yarn and fabric properties in a modified ring spinning system considering the effect of the friction surface of the false-twister

2019 ◽  
Vol 90 (5-6) ◽  
pp. 572-580 ◽  
Author(s):  
Rong Yin ◽  
Xiao-Ming Tao ◽  
Bin-gang Xu
Keyword(s):  
Surface Roughness ◽  
Friction Surface ◽  
Experimental Results ◽  
Material Surface ◽  
Ring Spinning ◽  
Knitted Fabrics ◽  
Yarn Properties ◽  
Cotton Yarns ◽  
The Relationship

This paper experimentally studies the relationship between the friction surface of a false-twisting unit and the quality of cotton yarns produced by a modified ring spinning system, with the adoption of the single friction-belt false-twister. The friction surface of the false-twisting unit, as a key twisting component, has been studied in terms of material, surface roughness, hardness and diameter, as well as the interaction between these factors and resultant yarn properties, with particular attention to yarn imperfections. Experimental results showed that the false-twisting unit with a short interactive path demonstrated significant reduction of yarn imperfections, especially yarn neps. With the optimal false-twisting unit, performances of the modified yarns and their knitted fabrics were evaluated and compared with the conventional ones.

scholarly journals Synthesis of Corn Starch Derivatives and Their Application in Yarn Sizing

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1251
Author(s):  
Stana Kovačević ◽  
Ivana Schwarz ◽  
Suzana Đorđević ◽  
Dragan Đorđević
Keyword(s):  
Corn Starch ◽  
Raw Material ◽  
Hydroxyethyl Methacrylate ◽  
Yarn Properties ◽  
Cotton Yarns ◽  
Starch Derivatives ◽  
Environmental Contribution ◽  
Fabric Production ◽  
Lower Size ◽  
Yarn Surface

The use of synthesized natural starches for the sizing process in fabric production is primarily an environmental contribution. Synthesized corn starch is environmentally friendly and productive, showing good results in cotton yarn sizing. Acrylamide (AA) and 2-hydroxyethyl methacrylate (HEMA) were applied for the grafting process of corn starch, and the initiators azobisisobutyronitrile (AIBN), potassium persulfate (KPS), and benzoyl peroxide (BP) were chosen to form the grafted monomers more effectively. The application of synthesized corn starch has been confirmed, especially with the AIBIN initiator in the grafting process of HEMA onto starch. The FTIR analysis confirmed that new and efficient products for sizing cotton yarns based on natural raw material (corn) were developed. The research showed that the synthesized corn starch improved physical-mechanical yarn properties and abrasion resistance and reduced yarn surface hairiness. Ultrasonic desizing of yarn and the use of a lower size concentration led to better results than desizing by washing, and the Tegewa numbers confirmed that the desizing process was successful.

Structure and Properties of Double-Filament Tri-Component Combined Yarn

2014 ◽  
Vol 1035 ◽  
pp. 101-105
Author(s):  
Yi Qiang Gao
Keyword(s):  
Abrasion Resistance ◽  
Manufacturing Process ◽  
Breaking Strength ◽  
Structure And Properties ◽  
Breaking Elongation ◽  
Yarn Properties ◽  
Yarn Structure ◽  
Yarn Hairiness

Manufacturing process of combined yarn with different filament size and cotton roving has been discussed. It shows that filament feeding point has some effect on combined yarn structure and yarn properties. If the filaments are fed from different sides of the cotton strand, they usually wrap the strand in parallel. If the filaments are fed from the same side of the strand, they wrap the strand crossed more often. Filament feeding point has an effect on yarn hairiness while it affects yarn breaking strength, yarn breaking elongation and abrasion resistance slightly. Yarn property weight is determined by subjective empowerment and Borda method is used to analyze yarn property. It has proved that if the filaments are fed from different sides of the cotton strand, the filament-roving space is set at 4mm respectively; the combined yarn shows the best.

scholarly journals The Effect of Humidified Air on Yarn Properties in a Jet-Ring Spinning System

Tekstilec ◽  
2020 ◽  
Vol 63 (4) ◽  
pp. 294-304
Author(s):  
Ekrem Gulsevincler ◽  
◽  
Mustafa Resit Usal ◽  
Demet Yilmaz ◽  
◽  
...  
Keyword(s):  
Relative Humidity ◽  
Pure Water ◽  
Air Conditioner ◽  
System A ◽  
Yarn Properties ◽  
Atmospheric Relative Humidity ◽  
Yarn Hairiness ◽  
Air Nozzle ◽  
Yarn Tenacity ◽  
Humidified Air

In this study, the effect of 100% atmospheric relative humidity on yarn properties was investigated using jet-ring nozzles and compared with the yarn properties of yarns produced with air operated jet-ring nozzles under normal conditions. As a humidification system, a pneumatic conditioner, also known as a lubricant, was used in pneumatic systems. This conditioner was connected just before the pneumatic distributor that supplies air to the nozzles. The tube in stage 2 of the conditioner was filled with pure water at room temperature (25 °C ± 2 °C). The air conditioner dose was adjusted to 100% atmospheric relative humidity. The use of humidified air to jet-ring nozzles had a slight positive effect on all yarn properties (yarn hairiness, yarn irregularity, yarn elongation and yarn tenacity). According to the results, it resulted in a 1% to 3% improvement in yarn quality. This study is the first example and an original study in this field, as there is no study using humidified air in existing jet-ring air nozzle studies. It was proven in this study that humidified air results in a slight improvement in yarn properties.

Research on the Performance Comparison of Several Solid Poly-Acrylic Acid Sizes

2014 ◽  
Vol 1048 ◽  
pp. 98-103
Author(s):  
Yan Qin Shen ◽  
Hai Liang Wu ◽  
Dan Zhou ◽  
Yi Chen Tang
Keyword(s):  
Acrylic Acid ◽  
Performance Indicators ◽  
Reduction Rate ◽  
Great Difficulty ◽  
Performance Comparison ◽  
Rate Reduction ◽  
Film Forming ◽  
Cotton Yarns ◽  
Yarn Hairiness ◽  
Poly Acrylic Acid

Size plays an important role in sizing. The sort of size is various, and its various performance indicators are not comprehensive, so it brings very great difficulty to sizing workers. Through a large number of experiments, LX-6, PAM, SFB, LM, FY five kinds of solid poly-acrylic acid size of various performances had been tested, contrasted and analyzed. Meanwhile, the film-forming ability, and the adhesion of pure cotton roving and polyester-cotton roving were tested. Moreover, we did experiments on polyester cotton yarns, which were sized with these five kinds of size, and the sized yarn hairiness reduction rate, moisture regain, enhancement rate, reduction rate and other performance indicators had been tested, contrasted and analyzed. Results provide reference for the use of these five kinds of size.

Influence of Spinning Speed at Self-Twist Spinning System on Yarn Quality

2011 ◽  
Vol 332-334 ◽  
pp. 560-563 ◽  
Author(s):  
Hong Cui ◽  
Chong Wen Yu
Keyword(s):  
Cross Sectional ◽  
Yarn Quality ◽  
Yarn Twist ◽  
Yarn Hairiness ◽  
Yarn Tenacity ◽  
Plied Yarn ◽  
Spinning Speed ◽  
Sectional Shape ◽  
Different Characteristics ◽  
Twist Spinning

The effect of spinning speed on yarn quality at self-twist spinning system was investigated. The yarns were assessed for different characteristics using objective tests. The results show that yarn hairiness of self-twist yarn increases with the increase of spinning speed and yarn tenacity and extension decrease with increment of spinning speed. The results also show that yarn irregularity, yarn imperfections and yarn twist level have no obvious changes with the increasing in spinning speed. Furthermore, the longitudinal and cross-sectional shape of self-twist yarn were observed and the pictures show that S-twist and Z-twist zone have almost the same structure as the two-plied yarn at ring spinning system and no twist zone has an approximately 45mm length which can influence the strength of the self-twist yarn.

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