Cellulase immobilized on kaolin as a potential approach to improve the quality of knitted fabric

2022 ◽  
Author(s):  
Janaina de Souza Lima ◽  
Ana Paula Serafini Immich ◽  
Pedro Henrique Hermes de Araújo ◽  
Débora de Oliveira
Keyword(s):  
Knitted Fabric ◽  
Potential Approach

A New Technique for Feeding Yarn in a Flat Bed Knitting Machine

1995 ◽  
Vol 209 (2) ◽  
pp. 151-154 ◽  
Author(s):  
P K Choy ◽  
J Atkinson ◽  
T Dias
Keyword(s):  
Dimensional Stability ◽  
Knitted Fabric ◽  
Feed Speed ◽  
Yarn Tension ◽  
Factors Influencing ◽  
Exact Shape ◽  
A New Technique ◽  
Shape And Size ◽  
Significant Factors

The quality of knitted fabric panels is of considerable importance to the knitwear industries. The latest development in flat bed knitting technology improves the efficiency of the production by knitting fully fashioned fabric panels that are to exact shape and size. This greatly reduces the cutting waste and length of time for the making-up process, but garment manufacturers are still facing the difficulty of retaining dimensional stability of the knitted panels. One of the significant factors influencing this undesired property is input yarn tension variation. The analysis of this problem is described and a new method of yarn feeding is also suggested. This method utilizes storage yarn feed to eliminate the undesired effect of yarn feed speed variation and has been applied as a prototype. The results show a promising and satisfactory improvement in the fabric quality.

scholarly journals Image Analysis as a Method of the Assessment of Yarn for Making Flat Textile Fabrics

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Marcin Idzik ◽  
Marek Idzik
Keyword(s):  
Linear Density ◽  
Knitted Fabric ◽  
Test Results ◽  
Knitted Fabrics ◽  
Textile Fabrics ◽  
Yarn Quality ◽  
Computer Aided ◽  
Technological Processing ◽  
Spinning Mill

AbstractDuring the technological processing of staple fibers into yarn drafting, waves are formed which increase the irregularity of yarn linear density and consequently affect the yarn quality. Even a correctly performed technological process does not allow one to completely eliminate yarn faults (thin and thick places, neps) and yarn irregularity. All the yarn imperfections distinctly become apparent in flat textiles made of such a yarn. The quality of the yarn produced should be assessed already in spinning mill, using the results obtained to conclude on the quality of woven or knitted fabrics. Modern metrological laboratories in spinning mills possess Uster Tester 5 (UT5) apparatuses that not only assess the yarn quality with respect to the irregularity of linear density, faults (thin and thick places, neps), or hairiness, but also using the test results obtained make it possible to create a digital image of the predicted appearance of a flat fabric made of the yarn tested. This article presents a computer-aided method of the analysis of the woven and knitted fabric images obtained from UT5 that allows one to assess the significance of particular yarn parameters in the predicted appearance of flat fabrics.

Effect of yarn appearance on apparent quality of weft knitted fabric

2005 ◽  
Vol 96 (5) ◽  
pp. 295-301 ◽  
Author(s):  
D. Semnani ◽  
M. Latifi ◽  
M. A. Tehran ◽  
B. Pourdeyhimi ◽  
A. A. Merati
Keyword(s):  
Knitted Fabric ◽  
Weft Knitted Fabric

Effect of Hot Press Parameters on the Consolidation Quality of Biaxial Knitted Composites from Commingled Yarn

2011 ◽  
Vol 332-334 ◽  
pp. 2069-2073 ◽  
Author(s):  
Qiu Mei Wang ◽  
Xin Yi Hu ◽  
Lei Tan ◽  
Jing Gao
Keyword(s):  
Processing Parameters ◽  
Holding Time ◽  
Void Content ◽  
Knitted Fabric ◽  
Hot Press ◽  
Optimal Processing ◽  
Commingled Yarn ◽  
Fabric Composites ◽  
Commingled Yarns

A GF/PP commingled yarns knitted fabric was processed into laminates composites by hot press and a processing parameters investigation had been carried out to determine the most suitable values of processing pressure, holding time and cooling condition. The consolidation quality was characterized by means of void content and tensile strengths. It was found that the void content decreases while the tensile strength increases with the increasing of holding time, and under the gradually cooling rate with pressure in hot press. Optimal processing conditions for manufacturing of commingled GF/PP biaxial knitted fabric composites were suggested.

scholarly journals Vietnamese EFL Students’ Perceptions of Noticing-Based Collaborative Feedback on Their Writing Performance

2016 ◽  
Vol 9 (5) ◽  
pp. 141 ◽  
Author(s):  
Trang Thi Doan Dang
Keyword(s):  
Learning Styles ◽  
Reciprocal Learning ◽  
Secondary Classrooms ◽  
Learning Achievement ◽  
Writing Performance ◽  
Potential Approach ◽  
Efl Students ◽  
Strong Consensus ◽  
Dependent Learning

<p>It has been theoretically and empirically acknowledged that collaborative feedback is beneficial to learning achievement. However, feedback research remains relatively contentious due to learners’ differing viewpoints on how feedback is best given. Although a large number of studies have explored learners’ perspectives on collaborative feedback, little classroom-based research has promoted noticing through collaborative feedback. To address this, this study aims to infuse noticing-based collaborative correction into secondary classrooms to explore students’ perceptions of such feedback practice on their written output. Forty-one students’ responses to the list of close-ended questionnaires revealed a strong consensus about this potential approach although there are indications that the participants’ dependent learning styles had influenced these findings. An obvious implication of this is that students might benefit from various scaffolding sources, and thus there is a need for teachers to be aware of the influence of reciprocal learning among learners so that the quality of feedback practices may be enhanced.</p>

Immunoferritin localization of intracellular antigens in positively stained frozen sections

1978 ◽  
Vol 36 (2) ◽  
pp. 168-169
Author(s):  
K. T. Tokuyasu
Keyword(s):  
Surface Tension ◽  
Water Surface ◽  
Thin Layers ◽  
The Other ◽  
Positive Staining ◽  
Frozen Sections ◽  
The Past ◽  
Ultrathin Frozen Sections ◽  
Definition Of

During the past investigations of immunoferritin localization of intracellular antigens in ultrathin frozen sections, we found that the degree of negative staining required to delineate u1trastructural details was often too dense for the recognition of ferritin particles. The quality of positive staining of ultrathin frozen sections, on the other hand, has generally been far inferior to that attainable in conventional plastic embedded sections, particularly in the definition of membranes. As we discussed before, a main cause of this difficulty seemed to be the vulnerability of frozen sections to the damaging effects of air-water surface tension at the time of drying of the sections.Indeed, we found that the quality of positive staining is greatly improved when positively stained frozen sections are protected against the effects of surface tension by embedding them in thin layers of mechanically stable materials at the time of drying (unpublished).

Lithography below 100 nm

1983 ◽  
Vol 41 ◽  
pp. 96-99
Author(s):  
L. D. Jackel
Keyword(s):  
Spatial Distribution ◽  
Electron Beam ◽  
Electron Scattering ◽  
Electron Beam Lithography ◽  
Substrate Material ◽  
Local Electron ◽  
Electron Dose ◽  
Positive Resist ◽  
Exposure Process

Most production electron beam lithography systems can pattern minimum features a few tenths of a micron across. Linewidth in these systems is usually limited by the quality of the exposing beam and by electron scattering in the resist and substrate. By using a smaller spot along with exposure techniques that minimize scattering and its effects, laboratory e-beam lithography systems can now make features hundredths of a micron wide on standard substrate material. This talk will outline sane of these high- resolution e-beam lithography techniques.We first consider parameters of the exposure process that limit resolution in organic resists. For concreteness suppose that we have a “positive” resist in which exposing electrons break bonds in the resist molecules thus increasing the exposed resist's solubility in a developer. Ihe attainable resolution is obviously limited by the overall width of the exposing beam, but the spatial distribution of the beam intensity, the beam “profile” , also contributes to the resolution. Depending on the local electron dose, more or less resist bonds are broken resulting in slower or faster dissolution in the developer.

Convergent Beam Electron Diffraction

1978 ◽  
Vol 36 (3) ◽  
pp. 304-315
Author(s):  
G. Lehmpfuhl
Keyword(s):  
Electron Diffraction ◽  
Diffraction Pattern ◽  
Crystal Surface ◽  
Diffraction Spot ◽  
Crystal Thickness ◽  
Large Area ◽  
Electron Microscopic ◽  
Additional Information ◽  
Microscopic Investigations

Introduction In electron microscopic investigations of crystalline specimens the direct observation of the electron diffraction pattern gives additional information about the specimen. The quality of this information depends on the quality of the crystals or the crystal area contributing to the diffraction pattern. By selected area diffraction in a conventional electron microscope, specimen areas as small as 1 µ in diameter can be investigated. It is well known that crystal areas of that size which must be thin enough (in the order of 1000 Å) for electron microscopic investigations are normally somewhat distorted by bending, or they are not homogeneous. Furthermore, the crystal surface is not well defined over such a large area. These are facts which cause reduction of information in the diffraction pattern. The intensity of a diffraction spot, for example, depends on the crystal thickness. If the thickness is not uniform over the investigated area, one observes an averaged intensity, so that the intensity distribution in the diffraction pattern cannot be used for an analysis unless additional information is available.

Observability of Very Thick Specimen by Using Transmission Scanning Electron Microscope

1971 ◽  
Vol 29 ◽  
pp. 26-27
Author(s):  
K. Shibatomi ◽  
T. Yamanoto ◽  
H. Koike
Keyword(s):  
Electron Microscope ◽  
Image Quality ◽  
Scanning Electron Microscope ◽  
Chromatic Aberration ◽  
Image Contrast ◽  
Objective Lens ◽  
Thick Specimen ◽  
Transmission Electron ◽  
Scanning Electron

In the observation of a thick specimen by means of a transmission electron microscope, the intensity of electrons passing through the objective lens aperture is greatly reduced. So that the image is almost invisible. In addition to this fact, it have been reported that a chromatic aberration causes the deterioration of the image contrast rather than that of the resolution. The scanning electron microscope is, however, capable of electrically amplifying the signal of the decreasing intensity, and also free from a chromatic aberration so that the deterioration of the image contrast due to the aberration can be prevented. The electrical improvement of the image quality can be carried out by using the fascionating features of the SEM, that is, the amplification of a weak in-put signal forming the image and the descriminating action of the heigh level signal of the background. This paper reports some of the experimental results about the thickness dependence of the observability and quality of the image in the case of the transmission SEM.

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