The analysis of dimensional stability of 1x1 RIB Co and Co/LY knitwear

© 2018 Inst. Nat. Cercetare-Dezvoltare Text. Pielarie. All rights reserved. This paper analyzes the impact of knitwear's fiber composition, linear density and finishing of yarn used in the dimensional stability of the 1x1 RIB knitwear made on the same circular knitting machine. Dimensional stability of these samples was analysed by FAST 4 method. Different samples were compared across multiple indicators. The results show that the most stable dyed knitted fabric are made of cotton 96% and 4% of Lycra and of yarn with linear density 19.14 tex. Tightness factor's values in the dry relaxation stood at 17.90, in the wet 18.45, in total 18.73 and 18.59 in air conditioned terms. Knitwear with the highest values of dimensional instability are raw knitted fabric made of 100% CO, and yarn with linear density of 13.39 tex. Tightness factor's values in the dry relaxation stood at 12.16, in the wet 12.36, in total 13.26 and 13.35 in air conditioned terms

Rheological Modeling of Yarn Elongation

Na temelju eksperimentalnih podataka dobivenih za istezanje pređe u standardnim uvjetima ispitivanja, kombinacijom poznatih elementarnih reoloških modela, postavljenih reoloških modela istezanja pređe, izvedene su i riješene odgovarajuće diferencijalne jednadžbe za ispitivane pređe. Time je dobivena ovisnost između jedinične sile (naprezanja) i relativnog istezanja. Modeli su postavljeni za tri vrste pređe: vunena pređa finoće 21 tex prosječnog broja uvoja 1646 m-1 uz koeficijent varijacije 6,78%, pamučna pređa finoće 10 tex prosječnog broja uvoja 1020 m-1 uz koeficijent varijacije 16,7 i pređa od mješavine vuna/PES 76/24% finoće 12,5 tex prosječnog broja uvoja 1080 m-1.Based on the experimental data obtained for yarn elongation in standard test conditions, by combination of known elementary rheological models and established rheological models of yarn elongation, differential equations for the tested yarns were derived and solved. Thereby, the dependence between unit force (stress) and relative elongation was obtained. The models were established for three types of yarn: wool yarn with a count of 21 tex of anaverage twist level of 1,646 m-1 with a variation coefficient of 6.78%, cotton yarn with a count of 10 tex of an average twist level of 1,020 m2 with a variation coefficient of 16.7% and wool/PES blend yarn 76/24% with a count of 12.5 tex and an average twist level of 1,080 min-1

Analysis of the influence of carbon fibers on the electrostatic properties of fabrics intended for the production of protective clothing

The paper examined the electrostatic properties of fabrics, of which three fabrics contain 1-2% carbon fibers in their raw material composition. The electrostatic properties of six fabric samples were compared, of which three fabrics were produced from 100% cotton fibers and three fabrics were produced from polyester, cotton and carbon fibers in the following ratio: sample 1: cotton 75%, polyester 24% and carbon fibers 1%, pattern 2: polyester 54%, cotton 44%, carbon fiber 2%, pattern 3: polyester 66.5%, cotton 32%, carbon fiber 1.5%. Samples 4, 5 and 6 are made of 100% cotton fibers. The surface masses of the tested samples are approximate and range from 201.7 g·m-2 to 210.5 g·m-2. The aim of the work is to compare fabrics that contain admixtures of carbon fibers in their raw material composition in a percentage ratio of 1% - 2% with fabrics that are produced from 100% cotton fibers and that have been processed for the purpose of antistatic, to establish which fabrics and to what extent provide better protection against the accumulation of electrostatic charge and which better absorb it from their surface and drain it through the fabric. The tests were carried out according to the EN ISO 1149-3 standard using the method that measures the discharge of electric charges. The results showed that fabrics containing carbon fibers showed lower values of Er (maximum electric field strength recorded on the device with the sample being tested at the measuring position) and higher values of protection factor S

Defining the memory function for tension and deformation of linear textile products on the basis of their rheological models

Defining the memory function for tension and deformation of linear textile products on the basis of their rheological models On the basis of rheological models for yarn elongation, which have been set out for three different kinds of yarns: 100% wool yarn, yarn count = 21 tex (1 tex = 1 g/ 1000 m), average number of torsion Tm = 646 torsion/m, where CV = 6.78%; 100% cotton yam, yarn count = 10 tex, average number of torsion T(m) = 1020 torsion/m, where CV = 16.7% and yarn in the mix 76% wool/ 24% PES, yam count 12.5 tex, average number of torsion T(m) = 1 080 torsion/m, memory functions have been defined for tension and deformation of linear textile products

Influence of relative density on deformation characteristics of plain weave fabrics

69-75The deformation characteristics of fabrics in relation to relative thread density have been studied. On the basis of experimental results and theoretical models, some real mathematical dependence has been set up, which can be used for projecting breakage characteristics of plain weave cotton fabrics. Equations for projecting breaking characteristics have been developed on the basis of fabrics geometrical model in linen weave and practical results. The equations include correction coefficients, depending on the relative density in fabrics. The results show that the relative thread density in fabrics affects their deformation characteristics. The relative thread density, if higher than 1 causes weaker quality parameters and this must be taken into consideration during designing of fabric

Burnout syndrome among special education professionals

The objective of this study was to assess the level of Burnout syndrome (BOS) among special educators in Serbia and to investigate the relationship between demographic characteristics (gender, age, years of working experience, parental status etc.) and syndromic burden. The complexity of problems in working with persons with developmental disabilities, slow rehabilitation process, and frequent discrepancy between the achievable results and parental expectations of children with disabilities, are some of the factors that additionally burden professionals who deal with this delicate population. Data were collected by surveying 129 professionals in six institutions in five cities in Serbia. Each participant filled the questionnaire in voluntarily, anonymous fashion. Data were collected by Maslach Burnout Inventory (adjusted Croatian translation) which measures BOS level presence and with a series of survey questions, which enquired the main demographic information (age, gender, martial status, years of practice, parental status etc.) Respondents gave answers to Maslach Burnout Inventory - Human service survey. According to our findings, a high level of emotional exhaustion was present among 35.7% of examinees, a high level of reduced professional accomplishment was present in 11.6% of examinees, while 1.6% of examinees exhibited elements of depersonalisation. Examinees financial situation proved to be a particularly important factor for Burnout syndrome manifestation. Even though clearly confirmed amongst special educators in Serbia, the Burnout syndrome represents a phenomenon. Possible reflections of such phenomenon are not acknowledged on a wider scale. Even though 92% of the respondents in the conducted study believe that there should be some sort of support program and stress management program for employees, these programs do not exist in any institution for persons with developmental disabilities in Serbia

In relation to NO-System, Stable Pentadecapeptide BPC 157 Counteracts Lidocaine-Induced Adverse Effects in Rats and Depolarisation In Vitro

Recently, the pentadecapeptide BPC 157-induced counteraction of bupivacaine cardiotoxicity has been reported. Medication includes (i) lidocaine-induced local anesthesia via intraplantar application and axillary and spinal (L4-L5) intrathecal block, (ii) lidocaine-induced arrhythmias, (iii) convulsions, and (iv) lidocaine-induced HEK293 cell depolarisation. BPC 157 applications (intraplantar, intraperitoneal, and intragastric) were given (i) immediately after lidocaine, (ii) 10 min after, or (iii) 5 min before. The BPC 157/NO-system relationship was verified with NO-agents, the NOS-blocker L-NAME and the NOS-substrate L-arginine, given alone and/or together, in axillary and spinal intrathecal blocks. BPC 157 applied immediately after lidocaine or 5 min before the application of lidocaine considerably ameliorated plantar presentation. BPC 157 medication considerably counteracted lidocaine-induced limb function failure; L-NAME was counteracted; L-arginine exhibited counteraction when given immediately after lidocaine, but prolongation was seen when given later. Given together, prophylactically or therapeutically, L-NAME and L-arginine (L-NAME + L-arginine) counteracted the other’s response. BPC 157 maintained its original response when given together with L-NAME or L-arginine. When BPC 157 was given together with L-NAME and L-arginine, its original response reappeared. BPC 157 antagonised the lidocaine-induced bradycardia and eliminated tonic-clonic convulsions. Also, BPC 157 counteracted the lidocaine-induced depolarisation of HEK293 cells. Thus, BPC 157 has antidote activity in its own right against lidocaine and local anesthetics