scholarly journals Influence of electron radiation on the physical and mechanical properties of a nonwoven fabric made using Spunlace technology

2021 ◽  
Vol 2124 (1) ◽  
pp. 012015
Author(s):  
R Yu Galimzyanova ◽  
M S Lisanevich ◽  
Yu N Khakimullin
Keyword(s):  
Mechanical Properties ◽  
Ionizing Radiation ◽  
Relative Elongation ◽  
Physical And Mechanical Properties ◽  
Nonwoven Fabric ◽  
Breaking Load ◽  
Raw Material ◽  
Radiation Sterilization ◽  
Electron Radiation ◽  
Surgical Gowns

Abstract The effect of electron radiation on the physical and mechanical properties of Sontara nonwoven fabric produced using spunlace technology has been studied. The initial raw material for the manufacture of materials using this technology, as a rule, are viscose, polyester, polypropylene and cellulose fibers. Such nonwovens are highly breathable and are therefore used in disposable surgical gowns and suits. Since radiation can be used to sterilize disposable surgical gowns, it is important to assess the resistance to ionizing radiation. It was found that the Sontara brand material is resistant to the effects of ionizing radiation - the physical and mechanical characteristics of the material (breaking load and relative elongation) in the longitudinal and transverse directions of the web do not significantly change when irradiated with absorbed doses up to 60 kGy. It should also be noted that a cloth with a basis weight of 68 g/m2 has a significant smell of strength after radiation sterilization.

scholarly journals Influence of the absorbed dose of radiation radiation on the destruction of polypropylene, depending on the location of the sample to the electron radiator

2020 ◽  
Vol 64 (11) ◽  
pp. 135-142
Author(s):  
Elvina R. Rakhmatullina ◽  
◽  
Rezeda Yu. Galimzyanova ◽  
Maria S. Lisanevich ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ionizing Radiation ◽  
High Temperatures ◽  
Medical Devices ◽  
Absorbed Dose ◽  
Physical And Mechanical Properties ◽  
Special Place ◽  
The World ◽  
Object Of Study ◽  
Surgical Gowns

Currently, polypropylene is one of the most common polymers in the world. Due to its resistance to high temperatures, strength and density, it has found very wide application in the field of medicine. Polypropylene produces medical devices, pharmaceutical packaging, containers, suture threads. But a special place is occupied by non-woven materials based on polypropylene: surgical underwear, surgical gowns. As you know, to sterilize these products using ionizing radiation, which is the most effective of all methods. However, it leads to the destruction of polypropylene, as a result of which its physical and mechanical properties deteriorate. It is also known that the dose of radiation can vary depending on the location of the product in the box. Thus, materials can be degraded to varying degrees depending on the location in the box from the electronic emitter. As the object of study was selected: PP 1562R polypropylene produced by OAO Nizhnekamskneftekhim. It has been established that the location of polypropylene samples upon irradiation has little effect on the degree of their destruction.

The Effect of Radiation Sterilization on the Stress-Strain Properties of Non-Woven Materials -Based on Polypropylene

2020 ◽  
Vol 992 ◽  
pp. 403-408
Author(s):  
Elvina R. Rakhmatullina ◽  
M.S. Lisanevich ◽  
Rezeda Yu. Galimzyanova ◽  
Yu.N. Khakimullin
Keyword(s):  
Ionizing Radiation ◽  
Absorbed Dose ◽  
Breaking Load ◽  
Radiation Sterilization ◽  
Stress Strain ◽  
Cross Direction ◽  
Absorbed Doses ◽  
Single Use ◽  
The Cross ◽  
The Web

Non-woven materials are widely used for the manufacture of disposable medical clothing and underwear. Radiation is widely used to sterilize single-use medical devices. The paper analyzes the effect of ionizing radiation at absorbed doses of 0-60 kGy on the stress-strain properties of medical non-woven spanmelt material based on polypropylene obtained by blow-molding technology. It has been established that ionizing radiation significantly reduces the breaking load and elongation in the machine and cross directions of the web. For this type of material, the most critical is the decrease in strength in the cross direction of the web, primarily because the level of strength in the cross direction of spanmelt materials is generally low. Sterilization by ionizing radiation further reduces strength and leads to the fact that non-woven materials irradiated with an absorbed dose of 50-60 kGy are close to unacceptable values in accordance with the requirements of EN 13975-2011.

The Effect of Lithium Alumina Silicate Phases on Elastic Modulus of Porcelain Tiles

2014 ◽  
Vol 92 ◽  
pp. 188-193 ◽  
Author(s):  
Tuna Aydin ◽  
Alpagut Kara
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Liquid Phase ◽  
Bulk Density ◽  
Bending Strength ◽  
Physical And Mechanical Properties ◽  
Raw Material ◽  
Closed Porosity ◽  
Low Viscosity ◽  
Porcelain Tiles

Spodumene, which is a lithium alumina silicate, has been used as a raw material in the production of thermal shock resistant whitewares and sanitarywares. The presence of spodumene results in enhancement of mullitization and imparts better physical and mechanical properties to ceramics. In this study, the influence of Lithium alumina silicate phases on the mechanical properties of standard porcelain stoneware body was investigated. Especially solid-solid reactions were observed between spodumene and quartz or spodumene and clay. These solid-solid reactions bring about a newly formed lithium alumina silicate (LAS) phases. Spodumene allows the development of a low viscosity liquid phase and results in a decrease in closed porosity, also with increase in bulk density, bending strength and elastic modulus.

scholarly journals EFFECTS OF FILLERS ON PROPERTIES OF ONE-PART POLYURETHANE SEALANTS WITH PRESENCE OF A LATENT CURING AGENT

2019 ◽  
Vol 62 (9) ◽  
pp. 60-65
Author(s):  
Kseniya A. Timakova ◽  
Yury T. Panov
Keyword(s):  
Mechanical Properties ◽  
Relative Elongation ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Oil Absorption ◽  
Curing Agent ◽  
Dispersed Filler ◽  
General Complex ◽  
And Performance ◽  
Filled Composite

In this study, the effects of fillers on the technological properties of polyurethane sealants and the physical and mechanical properties of air moisture curing sealants are investigated. The sequence of loading the components in the dissolver, factoring in the presence of a latent curing agent, is demonstrated. It was found that when filling within 20-80 parts weight per 100 parts weight of the pre-polymer, the general complex of physical and mechanical properties remains high. With the introduction of mineral dispersed filler, the tear strength increases, but the relative elongation at break decreases. The increase in the tensile strength occurs up to a certain limit, after which there is a decrease in the strength of the sealant. It was shown that based on the oil absorption value of the fillers, the type and the amount of a filler for the sealant can be evaluated, as oil absorption directly depends on the particle size, surface area and particle shape of the filler. It was observed that for maintaining high physical and mechanical properties of the composite and the optimum viscosity of the sealant, it is preferable to combine two kinds of fillers with different oil absorption. It was established that the application of fillers with high and low oil absorption has a positive effect on the technological and performance properties of sealants. The filler with high oil absorption contributes to the thixotropy of the sealant, while the filler with low oil absorption allows to form a more highly filled composite while preserving the high strength characteristics.

scholarly journals Analysis Physical and Mechanical Of Particle Boards Raw Materials Nipah Fruit Fiber

Teknomekanik ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 14-19
Author(s):  
M Saddikin ◽  
Hendri Nurdin ◽  
Primawati Primawati
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Average Density ◽  
Raw Material ◽  
Average Moisture Content ◽  
Particle Board ◽  
Wood Particles ◽  
Tapioca Flour

The raw materials of the timber industry, especially furniture, are increasingly difficult to obtain in the quantity and quality needed. The development efforts carried out were utilizing Nipah coir waste as a raw material for making particle boards. Particle boards are panel boards made of wood particles or materials containing lignocellulose. Nipah plants contain 27.3% lignin and 36.5% cellulose which has the potential to be used as raw material for particleboard production. This study aims to reveal the physical and mechanical properties of particleboards made from Nipah fruit fibre with adhesive using tapioca flour. The making of particle board is done with a ratio of 90%: 10%, 80%: 20%, 70%: 30%, 60%: 40%, by giving a pressure of 100 kg / cm2. Particle testing is carried out according to the JIS A 5908 standard (2003). From this study, the optimum results were obtained in variations of 60%:40%. The particle physical properties which have an average density value of 1.15 gr / cm3 and an average moisture content of 5.8%. While the mechanical properties obtained by the value of Modulus of Elasticity an average of 21,188.93 kg / cm2. This shows the particle board variations of 60%: 40% produced to meet the JIS A 5908 (2003) standard. Based on the analysis of the quality variations 60%: 40% of particle boards can be recommended as raw materials for interior furniture.

scholarly journals Estudo da produção de pavers para pisos intertravados utilizando resíduos de blocos de concreto

2021 ◽  
Vol 42 (1) ◽  
pp. 21
Author(s):  
Vasni Oliveira da Silva Junior ◽  
Victor Mateus Pavão ◽  
André Camacho Pontremolez ◽  
Bruno de Medeiros Costa ◽  
Gerson Cendes Saragosa ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Precast Concrete ◽  
Physical And Mechanical Properties ◽  
Raw Material ◽  
Technical Knowledge ◽  
Concrete Blocks

This work presents part of a study whose main objective is to observe the behavior of the physical and mechanical properties of the materials (raw material) and of products made for the civil construction from the precast concrete industry, such as concrete blocks and pavers for interlocking floors. Through the investigation, was identified the potential of using the concrete blocks waste of the production as aggregates added to the concretes utilized to produce pavers. Thus, it is expected that this work contributes as a basis for obtaining scientific and technical knowledge regarding the materials and procedures that must be adopted for the manufacture of pavers, allowing their production for commercialization.

scholarly journals Willow wood (Salix alba) as a raw material for pulp production

2005 ◽  
Vol 59 (7-8) ◽  
pp. 175-179
Author(s):  
Bojana Klasnja ◽  
Sasa Orlovic ◽  
Nenad Radosavljevic ◽  
Miroslav Markovic
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Populus Deltoides ◽  
Chemical Properties ◽  
Physical And Mechanical Properties ◽  
Raw Material ◽  
Poplar Wood ◽  
Salix Alba ◽  
Pulp Production ◽  
Sulphate Pulp

The properties of willow wood (structural-physical and mechanical properties and chemical composition) were investigated to determine the parameters of the technological process of semichemical and sulphate pulp manufacture. The experimental material was willow wood Salix alba cl. 107/65/7. Semichemical and sulphate pulp were obtained in the laboratory. The yield, chemical properties and physical-mechanical properties of the obtained intermediate products intended for paper manufacture, were determined. The properties of poplar wood Populus deltoides Bartr. cl.725, were studied and its pulp production performed with the aim of comparison.

High-Effective Lightweight Aggregate Obtained from Glass-Containing Waste

2020 ◽  
Vol 787 (12) ◽  
pp. 66-71
Author(s):  
H.N. Mammadov ◽  
◽  
I.H. Suleymanova ◽  
B.M. Tahirov ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Strength Class ◽  
Physical And Mechanical Properties ◽  
Lightweight Aggregate ◽  
High Strength ◽  
Raw Material ◽  
Material Base ◽  
Current Standard ◽  
Iron And Steel

The properties of high-strength artificial porous aggregate from glass-containing waste of metallurgical productions are described. The developed technology makes it possible to expand the raw material base for the production of aggregates for light concrete. Granulated slags of metallurgical productions – the main (M0>1) slags of the Novokuznetsk Iron and Steel Plant and acid (M0<1) slags of the Gorky plant are studied. According to the results of studies, it was found that the optimal swelling interval for acidic slags is 1000–1100оC, and for basic slags-1100–1150оC. A high – strength artificial porous aggregate-slag gravel with a bulk density of 340–780 kg/m3 and a compressive strength in the cylinder of 2.8–12.3 MPa was obtained. The main physical and mechanical properties of the resulting aggregate, which meets the requirements of the current standard GOST 9757–90 “Gravel, crushed stone and sand. Artificial porous”, were studied. The aggregate obtained is almost twice as strong as the known aggregate of expanded clay gravel. With the use of porous gravel and sand, light concrete of strength class B7,5–B40 and a density of 1100–1600 kg/m3 was obtained.

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