In this work the tensile properties and structural characteristics of polypropylene filaments, produced by melt spinning from two different polymers; polymer with the low melt flow index (a plastic grade polymer used for production of cast and injected products) and polymer with the high melt flow index (a fibre grade polymer used for production of textile fibres) are presented. The goal of our research was to optimize the melt spinning of filaments spun from the plastic-grade polymer (recycled polymer).
COBISS.SI-ID: 2321776
In our research the use of 100% recycled polypropylene from separately colected packaging waste for manufacturing of monofilaments was studied. Monofilaments were spun from the virgin polymer, from the blends of 85%/15% and 50%/50% virgin/recycled polymer. It was established that with adding the recycled polymer to the virgin polymer, the crystallinity and average molecular orientation were lowered, which influenced the tensile properties of monofilaments. As-spun monofilaments produced from blends are porous, brittle, rigid and have high tendency to break.
COBISS.SI-ID: 2250096
In the present paper, the microvoid systems of poly(ethylene terephthalate) PET and poly(propylene) PP fibres were studied after subjugation to different treatments. PP fibres were spun from two different polymers and drawn at different temperatures, whereas PET fibres were treated in different media. The form factors found for PET and PP fibres were rather high; for PP fibres between 2 and 5 and for PET fibres up to 8. Physical treatment of fibres caused modifications to the microvoid system (shape and content of voids) and increases fibre inhomogeneity.
COBISS.SI-ID: 2351728
The aim of the study is to determine ink dot formation by three different microscopic methods, optical microscopy (OM), scanning electron microscopy (SEM), and confocal laser scanning microscopy (CLSM). The main goal of the research was to evaluate the applicability of CLSM as a nondestructive method for three-dimensional visualization in the analysis of ink dot formation on UV ink jet prints. The authors showed that the CLSM technique can be used to rapidly assess the dot profile without physical sectioning.
COBISS.SI-ID: 2219888
The influence of addition of „master batch“ (MB) to the recycled polymers was evaluated. Thin plastic plates were produced from the reycled polypropylene, low-density and high-density polyethylene chips, made from the separatelly colected waste packaging, with and without the addition of 4% MB. The analyses have shown that the color uniformity of plates increased with the addition of MB, which resulted in the higher quality of UV ink-jet prints. The best print quality was determined at polypropylene plates. The addition of MB has some negative influence on the tensile properties of plates.
COBISS.SI-ID: 2171760