Wyniki wyszukiwania - BazTech

1

A Novel Foam Coating Approach to Produce Abrasive Structures on Textiles

Kenttä Eija, Kumar Vinay, Andersson Petter, Forsström Ulla

Autex Research Journal

|

2022

|

Vol. 22, no. 3

335--342

EN

Abrasive materials are classified as paper, nonwoven, or plastic-based multilayer structures, which are used for different kinds of surface finishing. Currently, the production of abrasive structures on textiles is carried out by spraying a slurry of binder and abrasive particles, e.g., Al2O3 or SiC, with subsequent drying and curing of the binder. The drawback of this production method is the poor runnability of the spraying process. Even small variations in the process parameters may lead to an uneven coating. Therefore, a novel coating approach was developed to produce abrasive structures with foam coating on textile substrates. The foam coating method, which is commonly used in the textile industry, has the potential to produce an even coating layer. The runnability and reliability of the foam coating process are good even with high solids. From a workplace safety perspective, another advantage of foam coating is that there are no airborne particles during the coating process. A polyamide woven cloth was foam coated with an aqueous slurry containing abrasive grains (SiC), a water-based UV-curable acrylate binder, and cellulose nanocrystals (CNCs) to adjust the slurry rheology. Stable abrasive-binder foams were generated from the slurries even at high solids of 50% using an anionic foaming agent. The cloth was foam coated and dried, and the resin was cured with a LED-UV lamp on a pilot scale. It was observed that without the addition of CNC the foam did not stay on the surface of the cloth after coating. CNC acts as a rheology modifier and co-binder, which prevent the foam from penetrating deeper into the pores of the cloth. CNC also acted as a dispersing agent: the slurry was effectively stabilized by the CNC to prevent sedimentation of the abrasive grains. An organic solvent-free composition was introduced by combining CNC with a water-based UV-resin.

2

Cellulose based micro- and nanocomposites

Çetin N. S., Özmen N.

Journal of Achievements in Materials and Manufacturing Engineering

|

2016

|

Vol. 76, nr 1

9--14

EN

Purpose: In this study, the comparative role of micro-and nano- sized cellulose powder in exploring the influence on the mechanical properties of high density polyethylene (HDPE) composites was investigated. Design/methodology/approach: For production of alpha-cellulose and nanocrystalline cellulose, pulp was produced from Turkish pine (Pinus brutia Ten.) sapwood by Kraft pulping technique. Firstly, alpha-cellulose was isolated from Turkish pine pulp. After that, microcellulose and nanocrystalline cellulose were produced from this alpha-cellulose by grinding and acid hydrolysis technique, respectively. In order to compare the effect of micro-cellulose or nanocrystalline cellulose (CNC) as a filler, micro-cellulose or CNC and HDPE composites were produced with 3 different wt% cellulose containing (1.5 and 10 wt%). Findings: The nanocrystalline cellulose-filled HDPE had a significantly higher tensile and impact strength than the micro-cellulose-filled HDPE composites.

3

Ozonation: a green source for oxidized cotton

Maqsood H. S., Wiener J., Baheti V., Eldeeb M., Militky J.

Fibres & Textiles in Eastern Europe

|

2016

|

Vol. 24, no. 1 (115)

19--21

EN

Research was carried out on the oxidation of cellulose by ozone treatment. It is considered as environment friendly in comparison with the existing oxidation methods used in industry for a long time. This treatment is used in different applications such as the scouring / bleaching of cotton fabrics and in improving the properties of Kraft pulp cellulose in the paper industry. In this study, the effect of Ozone treatment on cotton yarn properties was investigated. This investigation can help in obtaining the maximum crystalline percentage of cotton for the production of nano-crystalline cellulose. Two-ply cotton ring spun yarn was treated with ozone gas for different time periods. Yarn tensile properties, wickability, the copper number and physical appearance were observed. It is evident that yarn tensile properties deteriorate drastically after a certain time, while the wickability and copper number increase simultaneously.

PL

Badano oksydacje celulozy za pośrednictwem ozonu. Jest to metoda uważana jako ekologiczna w porównaniu do innych stosowanych w przemyśle metod oksydacji. Tego rodzaju obróbka stosowana jest w różnego rodzaju procesach takich jak odtłuszczanie i bielenie wyrobów bawełnianych oraz dla polepszenia właściwości masy celulozowej w przemyśle papierniczym. W artykule przedstawiono wpływ obróbki ozonem na właściwości przędz bawełnianych. Badania te są przydatne dla uzyskania maksymalnej procentowej zawartości struktur krystalicznych w bawełnie przy produkcji nano-krystalicznej celulozy. Bawełniane przędze obrączkowe poddawano działaniu ozonu w różnych przedziałach czasowych. Następnie badano właściwości wytrzymałościowe zwilżalność, liczbę miedziową i inne właściwości fizyczne. Stwierdzono, że podczas obróbki ozonem właściwości wytrzymałościowe zmniejszają się drastycznie podczas gdy zwilżalność i liczba miedziowa ulegają zwiększeniu.