scholarly journals Effects of Draw Ratio and Additive on Knot-Pull Breaking Phenomenon in a Polypropylene Monofilament

2020 ◽  
Vol 76 (12) ◽  
pp. 403-411
Author(s):  
Tatsuma Kunimitsu ◽  
Chisa Ikeda ◽  
Shuntaro Oshima ◽  
Toshifumi Ikaga ◽  
KyoungHou Kim ◽  
...  
Keyword(s):  
Draw Ratio ◽  
Polypropylene Monofilament

Looped suture properties: implications for multistranded flexor tendon repair

2015 ◽  
Vol 40 (3) ◽  
pp. 234-238 ◽  
Author(s):  
R. Haddad ◽  
T. Peltz ◽  
N. Bertollo ◽  
W. R. Walsh ◽  
S. Nicklin
Keyword(s):  
Mechanical Properties ◽  
Flexor Tendon ◽  
Tendon Repair ◽  
Relative Effect ◽  
Flexor Tendon Repair ◽  
Polypropylene Monofilament ◽  
Single Suture ◽  
Biomechanical Strength ◽  
Standard Techniques ◽  
Repair Techniques

Multiple-strand repair techniques are commonly used to repair cut flexor tendons to achieve initial biomechanical strength. Looped sutures achieve multiple strands with fewer passes and less technical complexity. Their biomechanical performance in comparison with an equivalent repair using a single-stranded suture is uncertain. This study examined the mechanical properties of double-stranded loops of 3-0 and 4-0 braided polyester (Ticron) and polypropylene monofilament (Prolene). Double loops were generally less than twice the strength of a single loop. Ticron and Prolene had the same strengths, but Ticron was stiffer. The 4-0 double loops had significantly higher stiffness than 3-0 single loops. Increasing the size of sutures had a larger relative effect on strength than using a double-stranded suture. However, a double-strand loop had a larger effect on increasing stiffness than using a single suture of a larger equivalent size. Looped suture repairs should be compared with standard techniques using a thicker single suture.

Response of fiber diameter to a continuously changing draw ratio in a laser drawing process

2015 ◽  
Vol 86 (10) ◽  
pp. 1074-1083 ◽  
Author(s):  
Munekazu Matoba ◽  
Yutaka Ohkoshi ◽  
Kyoung Hou Kim ◽  
Toshifumi Ikaga
Keyword(s):  
Draw Ratio ◽  
Fiber Diameter ◽  
Drawing Process

scholarly journals Physico-Mechanical Performance Evaluation of Large Pore Synthetic Meshes with Different Textile Structures for Hernia Repair Applications

2018 ◽  
Vol 26 (2(128)) ◽  
pp. 79-86 ◽  
Author(s):  
Pengbi Liu ◽  
Hong Shao ◽  
Nanliang Chen ◽  
Nanliang Cheng ◽  
Jinhua Jiang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hernia Repair ◽  
Mechanical Performance ◽  
Structural Parameters ◽  
Strength Properties ◽  
Open Loop ◽  
Burst Strength ◽  
Patch Application ◽  
Large Pore ◽  
Polypropylene Monofilament

This paper studied the relationship between the textile structure of warp knitted hernia repair meshes and their physico-mechanical properties to solve the problem of hernia patch application evaluation and clear the mechanism of hernia patch structure-performance for clinical application. Six different prototypes of large pore meshes were fabricated, including four kinds of meshes with different pore shapes: H (hexagonal), D (diamond), R (round) and P (pentagonal); and two kinds of meshes with inlays: HL (hexagonal with inlays) and DL (diamond with inlays), using the same medical grade polypropylene monofilament. All meshes were designed with the same walewise density and coursewise density. Then the influence of other structural parameters on the physico-mechanical properties of the meshes was analysed. The physico-mechanical properties of these meshes tested meet the requirements of hernia repair, except mesh DL, whose tear resistance strength (12.93 ± 2.44 N in the transverse direction) was not enough. Mesh R and P demonstrated less anisotropy, and they exhibited similar physico-mechanical properties. These four kinds of meshes without inlays demonstrated similar ball burst strength properties, but mesh HL and DL exhibited better ball burst strength than the others. All in all, uniform structures are expected to result in less anisotropy, and meshes with inlays, to some extent, possess higher mechanical properties. And the ratio of open loop number to closed loop number in a repetition of weave of fabric has marked effect on the physico-mechanical properties. Thus we can meet the demands of specific patients and particular repair sites by designing various meshes with appropriate textile structures.

Optimizing parameters for continuous electrospinning of polyacrylonitrile nanofibrous yarn using the Taguchi method

2017 ◽  
Vol 48 (3) ◽  
pp. 559-579 ◽  
Author(s):  
Chang-Mou Wu ◽  
Ching-Hsiang Hsu ◽  
Ching-Iuan Su ◽  
Chun-Liang Liu ◽  
Jiunn-Yih Lee
Keyword(s):  
Principal Component Analysis ◽  
Taguchi Method ◽  
Flow Rate ◽  
Draw Ratio ◽  
Principal Component ◽  
Quality Characteristics ◽  
Optimal Parameters ◽  
Signal To Noise ◽  
Multiple Quality Characteristics ◽  
Nanofibrous Yarn

In this study, the Taguchi method, analysis of variance, and principal component analysis were used to design the optimal parameters with respect to different quality characteristics for the continuous electrospinning of polyacrylonitrile nanofibrous yarn. The experiment was designed using a Taguchi L9(34) orthogonal array. The Taguchi method is a unique statistical method for efficiently evaluating optimal parameters and the effects of different factors on quality characteristics. The experimental results obtained by this method are more accurate and reliable than one-factor-at-a-time experiments. The control factors discussed in this work include the draw ratio, nozzle size, flow rate, and draw temperature. The quality characteristics taken into consideration are fiber diameter, fiber uniformity, and fiber arrangement. The parameters to optimize the different quality characteristics were obtained from the main effect plot of the signal-to-noise ratios, after which analysis of variance and confidence intervals were applied to confirm that the results were acceptable. Multiple quality characteristics were analyzed by principal component analysis from the normalized signal-to-noise ratios and the principal component score. Combining the experimental and analysis results, the optimum parameters for multiple quality characteristics were found to be a draw ratio of 2.0, a nozzle number of 22 G, a flow rate of 7 ml/h, and a draw temperature 120℃.

scholarly journals Investigating the draw ratio and velocity of an electrically charged liquid jet during electrospinning

RSC Advances ◽  
2019 ◽  
Vol 9 (24) ◽  
pp. 13608-13613 ◽  
Author(s):  
Chenhui Ding ◽  
Hong Fang ◽  
Gaigai Duan ◽  
Yan Zou ◽  
Shuiliang Chen ◽  
...  
Keyword(s):  
Draw Ratio ◽  
Theoretical Calculations ◽  
Liquid Jet ◽  
Electrically Charged

Theoretical calculations and experiments were performed to determine the draw ratio and velocity of an electrospinning jet.

Geometrical and Optical Properties of Irregular Fibers as a Function of Draw Ratio

2008 ◽  
Vol 57 (4) ◽  
pp. 343-354 ◽  
Author(s):  
A. A. Hamza ◽  
T. Z. N. Sokkar ◽  
M. A. EL-Bakary ◽  
A. M. Ali ◽  
M. A. El-Morsy
Keyword(s):  
Optical Properties ◽  
Draw Ratio

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.

The Sequential Analysis of Film Deformation Behavior during Successive Biaxial Stretching Process

2013 ◽  
Vol 747 ◽  
pp. 611-614 ◽  
Author(s):  
Yoshiyuki Kushizaki ◽  
Masayoshi Tokihisa ◽  
Hideki Tomiyama ◽  
Toshiro Yamada
Keyword(s):  
Constitutive Equation ◽  
Deformation Behavior ◽  
Draw Ratio ◽  
Sequential Analysis ◽  
Machine Direction ◽  
Material Constants ◽  
Biaxial Stretching ◽  
Experimental Deformation ◽  
Stretching Ratio ◽  
Stretching Process

The deformation behavior of Polypropylene (PP) film during successive biaxial stretching process which consists of machine direction (MD) stretching process with a roll drawing and transverse direction (TD) stretching with a tentering was analyzed sequentially by using a finite element method (FEM). In order to analyze it, stress-strain curves of casted PP film and uni-axially oriented PP film in MD were measured and fitted into the constitutive equation that the authors developed previously, respectively, and then, material constants for both films were obtained. Deformation behavior during successive biaxial stretching were calculated by applying the constitutive equation with the material constants of casted PP film for MD stretching and uni-axially oriented PP film in MD for TD stretching, respectively. Analytical conditions were the draw ratio of 5 for MD analysis and the stretching ratio of 9.5 for TD analysis. The authors also experimentally measured the thickness of film during and after MD and TD stretching using a pilot plant under the same conditions as analytical condition. Calculated results were able to express qualitatively the experimental deformation behavior of PP film such as the neck-in phenomena during MD stretching and the change of film thickness during MD and TD stretching.

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