Wyniki wyszukiwania - Biblioteka Nauki

1

Bending Behaviour of LLDPE Monofilaments Depending on Cold Drawing and Composition of the LLDPEs

100%

Kolgjini B. , Schoukens G. , Shehi E. , Kiekens P.

|

2013

|

tom Vol. 21, no. 4 (100)

23--30

EN

The behaviour of the pile layer of artificial turf is an important element for the performance of artificial turf. As a top layer, it is constantly under deformation, with the most possible being bending . The bending behaviour of monofilaments of linear low density polyethylene (LLDPE) is strongly influenced by the processing parameters, the type of polymer, and geometrical factors, which in combination with each other seem to have a strong influence on the behaviour of the final product. From the results obtained, the use of octene instead of hexene as a monomer yields better results for resilience due to a higher concentration of intrafibrillar tie molecules for the same degree of DSC crystallinity of the LLDPEs. The increase in the final cross section of monofilaments based on the same LLPDPEs resulted in a decrease in the intrafibrillar tie molecules due to a slower cooling after melt extrusion.

PL

Badania dotyczyły obróbki wykańczalniczej jedwabiu naturalnego. Mikrostruktura jedwabiu była badana za pomocą skaningowej mikroroskopii elektronowej, a właściwości mechaniczne testowane były klasyczną zrywarką firmy Instron, podczas gdy strukturę krystaliczną analizowano za pomocą spektroskopii w podczerwieni (FTIR) oraz rozproszenia promieniowania rentgenowskiego. Wyniki pozwoliły wytypować najlepszą w danych warunkach metodę obróbki.

2

Study of the weavability of elastane based stretch yarns on air-jet looms

100%

De Meulemeester S. , Van Langenhove L. , Kiekens P.

|

tom Vol. 9, no. 2

54--60

EN

Elastane yarns are often used to produce stretch fabrics on knitting machines as well as rapier weaving machines. On air-jet weaving looms their use is still limited. That is why the objective of this paper is to investigate the weavability of elastane based stretch yarns on air-jet looms. Bobbins of elastane were woven on an air-jet loom and a distinction of the bobbins in three categories was made according to the most important production processes for elastane yarn: core twist, core spun and air covered. Yarn properties such as linear density, elongation at break and Air Index value were determined, weaving tests were performed and properties of the resulting fabric were determined.

3

An approach to the 'ProKNIT' system and its value in the production of weft-knitted fabrics

100%

Gravas E. , Kiekens P. , Van Langenhove L.

|

2005

|

tom Vol. 5, no. 4

220--227

EN

'ProKNIT' is the result of a project based on the consideration that knitted fabrics shrink in both directions, or that some of them shrink in one direction but expand in another. This shrinkage and extension is not proportional; it varies greatly depending on the type of knitted fabric. However, one value that always changes by increasing upon fabric shrinkage is the fabric's weight. Increases in weight from shrinkage will not only increase the cost of production but may also affect the final product in a number of ways. Therefore, a program that would help to avoid problems of this nature could be created which would predict the weight of the knitted fabrics in different relaxed conditions, by using appropriate variables such as knitting machine gauge, yarn count, type of fabric, fabric loop length, tightness factor and courses & wales per unit length, but would not be too difficult to operate. This is how 'proKNIT' came about. The first part of the word 'pro' derives from the Greek meaning 'before'; therefore, the name of the system appropriately refers to the estimations made before a knitting fabric is produced.

4

Possibilities to measure the concentration of sodium dithionite in textile applications by means of amperometric sensors

88%

Westbroek P. , Govaert F. , Gasana E. , Temmerman E. , Kiekens P.

|

tom Vol. 1, no. 1

30--38

EN

By using linear sweep voltammetry and chronoamperometry at a rotating disc electrode it was found that sodium dithionite can be oxidised at several electrode materials. At platinum, palladium, glassy carbon and gold an oxidation reaction was observed that showed promising characteristics for analytical purposes and sensor development. The limiting current signal at a potential of +0.3 V vs. SSE is proportional to the concentration of sodium dithionite, the electrode reacts almost immediately on a change of concentration of sodium dithionite and experimental proof is given that the electrode is stable for at least 3 days without recalibration. The electrode can be calibrated by a one point calibration because the calibration curve is linear and goes through the origin.

5

Influence of heat treatment on the bending behaviour of LLDPE monofilaments

75%

Kolgjini B. , Schoukens G. , Kola I. , Rambour S. , Shehi E. , Kiekens P.

|

2014

|

tom Vol. 14, no. 3

187--199

EN

It is known that artificial turf surfaces based on LLDPE monofilaments have the potential to replace natural turf surfaces used for several sport surfaces. Even though the production parameters have a strong influence on the behaviour of monofilaments and indirectly on the final product, the effect of heat treatment at different stages of the production lines is not studied in detail. Therefore, the influence of heat treatment during the production of monofilaments was investigated. This investigation includes a study of the mechanical properties such as tensile testing and bending behaviour and morphological analyses by employing DSC measurements. The results show that the applied heat treatment has a strong influence on the bending behaviour even though the classical studied morphology structures do not show significant changes. Heat treatment influences quite importantly the characteristics of the non-crystalline part of the monofilaments and results in better long-term properties, such as resilience, deformation recovery and fibrillation resistance.