Metode ekstrakcije brnistre ili žuke (Spartium Junceum L.)

Effects of different extraction methods of the Spanish Broom shoots were measured and compared with the purpose of obtaining composite material. The content of cellulose, lignin, pentosan and ash in the Spanish Broom fibers was determined. SEM analyses were performed.Mjereni su i uspoređeni učinci različitih postupaka maceracije izbojaka brnistre, radi upotrebe prirodnih vlakana u procesu dobivanja kompozitnih materijala. Uspoređeni su FTIR spektri nekih prirodnih vlakana, kao i FTIR spektri vlakana dobivenih različitim postupcima maceracije. U vlaknima brnistre određen je sadržaj celuloze, lignina, pentosana i pepela. Obavljene su SEM analize izbojka brnistre

Alumosilikatni spojevi zeolitnog tipa: sinteza, primjena i mogućnost stvaranja kompozita s celuloznim tekstilijama

Dan je pregled alumosilikatnih spojeva (zeolita), s naglaskom na sintetske, koji se koriste u svrhu dobivanja kompozitnih materijala u kojima je prisutan tekstil. Prikazani su postupci hidrotermalne sinteze alumosilikatnih mikroporoznih spojeva, odnosno mogućnosti dobivanja kompozitnih materijala celuloza - alumosilikat depozicijom zeolita na vlakna i tekstilne materijale, s posebnim osvrtom na mogućnosti primjene mikrovalnog zagrijavanja

TENCEL with a Microbial Barrier for Medical Bras

The goal of the research was to determine the properties of the microbial barrier TENCELr knitted fabrics intended for medical bras. The samples were tested according to a new method developed in the earlier research by the same authors. The most resistant forms of microorganisms of a pathogenic bacterial endospore of the Bacilllus genus were used to investigate microbial barrier permeability. Based on the samples tested and their characteristics, medical bra construction was developed with the aim of reducing irritation for the body part that underwent surgery. The data on the forms and measures were obtained using a 3D body scanner

Polarography Determination of Free Formaldehyde on Treated Cotton Fabrics

Application of compounds which, on textile material, release small quantities of formaldehyde makes it necessary to develop an adequate analytical method. Polarography is one of the possible analytical methods to be used. This paper investigates the possibility of using an indirect DC polarographic method via semicarbazone, with direct extraction of formaldehyde in the polarographic cell. Such a modified polarographic method is highly sensitive and selective, it makes it possible to measure small quantities of formal- hyde, while the maximum sample mass to be measured is around 0.2 g. Disturbances that presumably occur due to the presence of surface active agents on the textile material do not occur in the samples smaller than 0.2 g in 30 ml of the polarographic solution

Nova metoda određivanja barijernih svojstava medicinskog tekstila

U svrhu utvrđivanja svojstava mikrobne barijere razvijena je nova metoda ispitivanja medicinskih tekstilija u suhom stanju. Korištene su aerobne bakterijske spore Geobacillus Stearothermophilus i Bacillus Atrophaeus. Ispitivanja su provedena nakon 1, 10 i 20 ciklusa pranja i sterilizacije na tkanini od mješavine poliesterskih vlakana i pamuka, te tkanini od liocelnih vlakana. Rezultati ispitivanja novom metodom pokazali su da kod celuloznih medicinskih tekstilija dolazi do određene propusnosti bakterija u slučaju kontaminacije ekstremnom količinom aerobnih bakterijskih spora. Dok, materijali korišteni u realnim bolničkim uvjetima, nakon postupka pranja i sterilizacije imaju dobra svojstva mikrobne barijere. Dobiveni rezultati pokazuju da se ispitani celulozni medicinski materijali mogu koristiti kao učinkovita mikrobna barijera

Utjecaj sušenja na fizikalno-mehanička svojstva škrobljene pređe

Analiziran je utjecaj različitih način sušenja škrobljene pamučne konvencionalne pređe na njezina fizikalno-mehanička svojstva. Ispitivanja su provedena na pamučnoj pređi različitih finoća na novokonstruiranom laboratorijskom stroju za škrobljenje. Nakon škrobljenja pređa je sušena na tri načina: konvekcijskim, kontaktnim i mikrovalnim sušenjem. Prema dobivenim rezultatima, način sušenja škrobljene pređe ne utječe bitno na fizikalno-mehanička svojstva pređe. Najveći utjecaj načina sušenja primjetan je kod svojstva dlakavosti pri čemu je ona smanjena u slučaju primjene kontaktnog sušionika. Najveći doprinos mikrovalnog sušenja je u njegovoj ekonomičnosti i jednoličnosti sušenja, dok su postignuti efekti škrobljenja podjednaki efektima postignutima, danas najčešće primjenjivanim, kontaktnim načinom sušenja

Stabilnost dimenzija drva modificiranoga limunskom kiselinom uz različite katalizatore

Small wooden samples of fir (Abies alba Mill.) and beech (Fagus sylvatica L.) were chemically modified by citric acid (CA) as non-formaldehyde cross-linking system reagent and cured by convection heating at three different temperature regimes. Two different CA solutions were used, one with NaH2PO2 and the other with NaH2PO4 as a catalyst. The dimensional stability of the modified wood was determined by the anti-swelling efficiency (ASE) using the water soak/oven dry method. Almost equally large improvement of dimensional stability of wood was attained using NaH2PO4 as when NaH2PO2 was applied as a catalyst.Mali drveni blokovi jelovine i bukovine kemijski su modificirani neformaldehidnim sustavom za umrežavanje – limunskom kiselinom (CA), u trima različitim temperaturnim režimima. Upotrijebljene su dvije otopine limunske kiseline. U jednoj je katalizator bio NaH2PO2, a u drugoj NaH2PO4. Stabilnost dimenzija modificiranog drva određena je tzv. učinkom smanjenja bubrenja (ASE) metodom potapanja u vodi i sušenja do apsolutno suhog stanja. Upotrebom NaH2PO4 postignuto je gotovo jednako poboljšanje stabilnosti dimenzija kao i primjenom NaH2PO2

Extraction Methods of Spanish Broom (Spartium Junceum L.)

Effects of different extraction methods of the Spanish Broom shoots were measured and compared with the purpose of obtaining composite material. The content of cellulose, lignin, pentosan and ash in the Spanish Broom fibers was determined. SEM analyses were performed

Dimensional stability of wood modified by citric acid using different catalysts

Small wooden samples of fir (Abies alba Mill.) and beech (Fagus sylvatica L.) were chemically modified by citric acid (CA) as non-formaldehyde cross-linking system reagent and cured by convection heating at three different temperature regimes. Two different CA solutions were used, one with NaH2PO2 and the other with NaH2PO4 as a catalyst. The dimensional stability of the modified wood was determined by the anti-swelling efficiency (ASE) using the water soak/oven dry method. Almost equally large improvement of dimensional stability of wood was attained using NaH2PO4 as when NaH2PO2 was applied as a catalyst