Influence of Gamma and Electron Radiation on the Strength Characteristics of Nonwoven SMS Materials Based on Polypropylene

Radiation sterilization is widely used to sterilize nonwoven SMS medical products. SMS materials have improved filtering and barrier properties, low bacteriopermeability and, due to these properties, are indispensable for medicine. They are used to make such important health care products as disposable surgical clothing and underwear. As a result of the research carried out, the effect of gamma and electron radiation, in the range of absorbed doses from 15 to 25 kGy, on the strength characteristics of nonwoven SMS materials based on polypropylene with a surface density of 35, 40, 50 g/cm2 was studied. It has been established that the strength characteristics (tensile strength, tensile strength, and tear strength) of nonwoven materials decrease after exposure to ionizing radiation. The higher the density of the material, the more its characteristics decrease after radiation sterilization. It was also found that gamma radiation, due to its nature, has a stronger effect on nonwoven materials based on polypropylene, and leads to a stronger decrease in strength characteristics. In general, for products sterilized by ionizing radiation and made from SMS materials, it is important to control the strength characteristics, primarily, the tensile strength in the transverse direction of the web stuff.

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.992.403 ◽

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.

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The Effect of Polyquinone and Phenol-Phosphite Stabilizer on the Resistance of Polypropylene to Ionizing Radiation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.816.328 ◽

2019 ◽

Vol 816 ◽

pp. 328-332 ◽

Cited By ~ 1

Author(s):

M.S. Lisanevich ◽

Elvina R. Rakhmatullina ◽

Yu.N. Khakimullin ◽

Rezeda Yu. Galimzyanova ◽

R.M. Akhmadullin ◽

...

Keyword(s):

Ionizing Radiation ◽

Medical Devices ◽

Polymeric Materials ◽

Melt Flow Index ◽

Flow Index ◽

Radiation Sterilization ◽

Melt Flow ◽

Medical Products ◽

Degradation Temperature

For polymeric materials intended for the manufacture of disposable sterile medical devices, resistance to sterilization methods is important. For the manufacture of disposable medical products is widely used polypropylene, destructive during radiation sterilization. It is established that the addition of polyquinone leads to a decrease in the destruction of polypropylene, which is manifested in a decrease in the values of the melt flow index and an increase in the degradation temperature of polypropylene of the irradiated compositions.

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Analysis of the effect of ionizing radiation on the properties of bulk nonwoven material

Journal of Physics Conference Series ◽

10.1088/1742-6596/2124/1/012024 ◽

2021 ◽

Vol 2124 (1) ◽

pp. 012024

Author(s):

M S Lisanevich ◽

R Yu Galimzyanova ◽

V V Ivanov

Keyword(s):

Ionizing Radiation ◽

Medical Devices ◽

Dose Range ◽

Nonwoven Material ◽

Breaking Load ◽

Static Field ◽

Wound Dressings ◽

Radiation Sterilization ◽

Nonwoven Materials ◽

Wide Range

Abstract At the moment, there is a wide range of bulky nonwovens for various purposes on the market. One of the important areas of using such materials is healthcare. In particular, bulky nonwoven materials are intended for the manufacture of wound dressings, evacuation kits for newborns. Disposable medical devices of this kind are usually subjected to radiation sterilization. As is known from earlier studies, radiation sterilization significantly affects the performance of nonwovens. In this regard, for nonwoven materials for medical use, an important characteristic is the stability of indicators after exposure to radiation sterilization. As a result of the study of bulk nonwovens Holofiber ® after radiation radiation in the dose range from 20-60 kGy, there were no significant changes in operational performance. The stiffness increased by an average of 3-10%. The stiffness indicators after ionizing radiation according to GOST 24684 also meet the requirements. The value of electrification increased due to an increase in the static field under the action of ionizing radiation. It is worth noting that the values of electrification are within the norm established by GOST 32995. The breaking load varies from 1-5%. Thus, non-woven materials Holofiber ® PROFI, article P 35191, Holofiber ® SOFT, article P 5197, Holofiber ® SOFT, article P 5200 are recommended for the production of medical devices.

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

Journal of Physics Conference Series ◽

10.1088/1742-6596/2124/1/012015 ◽

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.

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The sterilization of surgical rubber gloves and plastic tubing by means of ionizing radiation

Epidemiology and Infection ◽

10.1017/s0022172400038596 ◽

1960 ◽

Vol 58 (4) ◽

pp. 465-472 ◽

Cited By ~ 6

Author(s):

R. Oliver ◽

A. H. Tomlinson

Keyword(s):

Tensile Strength ◽

Ionizing Radiation ◽

Gamma Rays ◽

Radiation Sterilization ◽

British Standard ◽

Practical Applications ◽

Plastic Bags ◽

Plastic Package ◽

Margin Of Safety ◽

Adequate Margin

Threads were infected with the spores of four species of bacteria and put inside rubber gloves which were sealed into plastic bags and irradiated with electrons or gamma rays. A dose of 1·5 Mrad. killed approximately 99·99% of the spores of each species and a dose of 2·5 Mrad. appeared to give an adequate margin of safety for sterilization. Spores were similarly killed inside plastic tubing and within the lumen of hypodermic needles.The tensile strength of the gloves decreased with increasing doses of radiation so that the rough, solution-dipped gloves tested were significantly weaker after 8·0 Mrad., but the smooth gloves tested still complied with the British Standard after 30 Mrad. When vacuum-packed before irradiation, rough gloves were still satisfactory after 16 Mrad., and smooth gloves were apparently unaffected by 30 Mrad.; they could, therefore, be sterilized six and twelve times, respectively.Radiation gives dependable sterilization of rubber gloves, and the use of a sealed plastic package obviates subsequent contamination. The possibility of using disposable radiation-sterilized gloves is discussed, the use of a plastic radiation indicator suggested and the practical applications of radiation sterilization in the hospital considered.

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Effects of radiation sterilization on the properties of nonwoven medical devices

Butlerov Communications ◽

10.37952/roi-jbc-01/20-64-11-127 ◽

2020 ◽

Vol 64 (11) ◽

pp. 127-134

Author(s):

Maria S. Lisanevich ◽

◽

Reseda Yu. Galimzyanova ◽

Ildar N. Musin ◽

◽

...

Keyword(s):

Ionizing Radiation ◽

Medical Devices ◽

Human Life ◽

Low Cost ◽

Absorbed Dose ◽

Nonwoven Material ◽

Radiation Sterilization ◽

Nonwoven Materials ◽

Wide Range ◽

Materials Used

Currently, there is a tendency for a significant increase in production and expansion of areas of application of nonwoven materials (NM), which are used in almost all areas of human life. Such properties of NMs as hydrophilicity or hydrophobicity, air permeability, good barrier and strength indicators at a relative low cost allow them to be effectively used for medical purposes. Nonwovens for medical use (NMMN) are considered. The most important stage in the final processing of medical devices made of NM is radiation sterilization. The influence of the absorbed dose and the type of ionizing radiation on the properties of NMMN of various designs: obtained by spunlace technology, by spunbond-meltblown-spunbond technology, and laminated nonwoven material has been studied. As a result of the conducted research, it was recommended: to sterilize NM with an electron beam, to control the consumer properties of medical devices from NM to check the quality of products after sterilization by assessing the change in the strength index with elongation, additionally to assess for laminated NM – water resistance, spunlace – absorption. In the production of nonwoven materials, various polymers are used, which have correspondingly different resistance to radiation sterilization. Some materials, for example, based on polypropylene, degrade when exposed to radiation, and the level of technical characteristics of the material is significantly reduced. It is also possible for autooxidative reactions initiated by radiation to occur in polymers, which can continue for a long time after irradiation of articles. To use these materials in radiation sterilized medical devices, it is necessary to have an understanding of the effect of ionizing radiation in a wide range of sterilizing doses on the materials used in these devices.

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Microstructure and physical properties of composite nonwovens produced by incorporating cotton fibers in elastic spunbond and meltblown webs for medical textiles

Journal of Industrial Textiles ◽

10.1177/15280837211004287 ◽

2021 ◽

pp. 152808372110042

Author(s):

Partha Sikdar ◽

Gajanan S Bhat ◽

Doug Hinchliff ◽

Shafiqul Islam ◽

Brian Condon

Keyword(s):

Tensile Strength ◽

Physical Properties ◽

Composite Structures ◽

High Surface ◽

High Surface Area ◽

Barrier Properties ◽

Cotton Fibers ◽

Adult Care ◽

Medical Textiles ◽

Improved Performance

The objective of this research was to produce elastomeric nonwovens containing cotton by the combination of appropriate process. Such nonwovens are in demand for use in several healthcare, baby care, and adult care products that require stretchability, comfort, and barrier properties. Meltblown fabrics have very high surface area due to microfibers and have good absorbency, permeability, and barrier properties. Spunbonding is the most economical process to produce nonwovens with good strength and physical properties with relatively larger diameter fibers. Incorporating cotton fibers into elastomeric nonwovens can enhance the performance of products, such as absorbency and comfort. There has not been any study yet to use such novel approaches to produce elastomeric cotton fiber nonwovens. A hydroentangling process was used to integrate cotton fibers into produced elastomeric spunbond and meltblown nonwovens. The laminated web structures produced by various combinations were evaluated for their physical properties such as weight, thickness, air permeability, pore size, tensile strength, and especially the stretch recovery. Incorporating cotton into elastic webs resulted in composite structures with improved moisture absorbency (250%-800%) as well as good breathability and elastic properties. The results also show that incorporating cotton can significantly increase tensile strength with improved spontaneous recovery from stretch even after the 5th cycle. Results from the experiments demonstrate that such composite webs with improved performance properties can be produced by commercially used processes.

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The Structure and Mechanical Properties of Hemp Fibers-Reinforced Poly(ε-Caprolactone) Composites Modified by Electron Beam Irradiation

Applied Sciences ◽

10.3390/app11125317 ◽

2021 ◽

Vol 11 (12) ◽

pp. 5317

Author(s):

Rafał Malinowski ◽

Aneta Raszkowska-Kaczor ◽

Krzysztof Moraczewski ◽

Wojciech Głuszewski ◽

Volodymyr Krasinskyi ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Electron Beam ◽

Impact Strength ◽

Flexural Modulus ◽

Natural Fibers ◽

High Energy ◽

Electron Radiation ◽

Elongation At Break ◽

Hemp Fibers

The need for the development of new biodegradable materials and modification of the properties the current ones possess has essentially increased in recent years. The aim of this study was the comparison of changes occurring in poly(ε-caprolactone) (PCL) due to its modification by high-energy electron beam derived from a linear electron accelerator, as well as the addition of natural fibers in the form of cut hemp fibers. Changes to the fibers structure in the obtained composites and the geometrical surface structure of sample fractures with the use of scanning electron microscopy were investigated. Moreover, the mechanical properties were examined, including tensile strength, elongation at break, flexural modulus and impact strength of the modified PCL. It was found that PCL, modified with hemp fibers and/or electron radiation, exhibited enhanced flexural modulus but the elongation at break and impact strength decreased. Depending on the electron radiation dose and the hemp fibers content, tensile strength decreased or increased. It was also found that hemp fibers caused greater changes to the mechanical properties of PCL than electron radiation. The prepared composites exhibited uniform distribution of the dispersed phase in the polymer matrix and adequate adhesion at the interface between the two components.

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