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0. Complete issue
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- 1. Application of statistical design of experiments for the optimization of floor tile glaze formulation
- Pages: 5-10
- Sousan Rasouli
- Abstract | Download | View
Abstract
This paper investigates the influence of the various parameters on the quality
of industrial Iranian floor tile glaze by using the experimental designs analysis,
Taguchi Method. A commercial grade of engobe and green body from
one of the national tile companies have been used. Three factors namely:
particle size of glaze slurry, sintering time and temperature were selected
to identify the influence of these factors on the quality of glaze. A Taguchi
L8 Orthogonal Arrays, fractional factorial design, was used to optimize
experimental trials. This approach successfully categorized the effect of each
variable using only 8 experimental trials and identified the most important
variables affecting this glaze making process with the analysis of variance
(ANOVA). The quality control tests of floor tile such as thermal shock resistance,
specking resistance and surface hardness were carried out according
to the existing Iranian standard. The optimized samples were obtained by
factorial design analysis; taking into account coarser particle size, higher
temperature and less time. The optimized sample was counter checked
using Taguchi method and by selecting effective factors in high levels. It
was demonstrated that, the particle size of the slurry is the only significant
parameter and sample with high level in particle size and temperature of
sintering is the best sample according to existing standard of floor tile.
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2. Modeling of deformation phenomena in volume label during its operation
- Pages: 11-17
- Svitlana Sheludko, Olga Ogirko
- Abstract | Download | View
Abstract
BIt was considered in the article the research of physical and mechanical
properties of materials based on PVC film ORACAL and RITRAMA that used
in the production of volume labels. In particular, it was shown the changes of
dependences between linear deformation of printed and unprinted films and
the value of stress with regard to their minimum and maximum values. It
was also established that deformation properties of the films are different in
the transverse and longitudinal directions, which should be considered when
producing labels. It was conducted the modeling of stress-strain state of
volume label when gluing it to the surfaces of various shapes. We considered
the boundary conditions for displacement and stress of labels layer components
with regard to the chemical structure of epoxy resins and their physical
and mechanical characteristics.
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3. Influence of printing speed on production of embossing tools using FDM 3D printing technology
- Pages: 19-27
- Jelena Žarko, Gojko Vladić, Magdolna Pal, Sandra Dedijer
- Abstract | Download | View
Abstract
Manufacturing of the embossing tools customary implies use of metals such
as zinc, magnesium, copper, and brass. In the case of short run lengths,
a conventional manufacturing process and the material itself represent
a significant cost, not only in the terms of material costs and the need
for using complex technological systems which are necessary for their
production, but also in the terms of the production time. Alternatively,
3D printing can be used for manufacturing similar embossing tools with
major savings in production time and costs. However, due to properties
of materials used in the 3D printing technology, expected results of
embossing by 3D printed tools cannot be identical to metal ones. This
problem is emphasized in the case of long run lengths and high accuracy
requirement for embossed elements. The objective of this paper is
primarily focused on investigating the influence of the printing speed on
reproduction quality of the embossing tools printed with FDM (Fused
Deposition Modelling) technology. The obtained results confirmed that
printing speed as a process parameter affects the reproduction quality
of the embossing tools printed with FDM technology: in the case of
deposition rate of 90 mm/s was noted the poorest dimensional accuracy in
relation to the 3D model, which is more emphasised in case of circular and
square elements. Elements printed with the highest printing speed have
a greater dimensional accuracy, but with evident cracks on the surface.
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- 4. Examination of printability parameters of IPA free offset printing
- Pages: 29-37
- Arif Ozcan
- Abstract | Download | View
Abstract
Fountain solution system in offset printing system has significant impacts
on the printing quality and fountain is the indispensable part of this
system. The most important chemical added into the fountain solution
is isopropyl alcohol. Fundamental features of isopropyl alcohol are
reducing surface tension and adjusting and stabilizing pH. However, in
the course of time, the disadvantages of using alcohol have emerged.
In the present study, the quality levels of IPA-based and IPA-free offset
prints were compared. Specially designed test scale printing was carried
out after IPA-based and IPA-free fountain solutions were prepared with
the same ink on matt-coated paper under optimal printing conditions.
Densitometric and spectrophotometric measurements were carried out
on the prints and it was ensured that they were printed in accordance
with ISO-12647-2:2013 offset printing standards. Special test scales that
were printed were read through scale readers and colour profiles were
obtained. Comparisons were carried out on the obtained IPA-free and IPAbased
printing colour gamut. Microscopic images of the smallest dots were
taken and edge sharpening was examined. Print brightness measurements
were carried out for the selected areas on the test scale. The study
practically demonstrated that printing performed by using IPA-free fountain
solution produced a better and wider colour gamut, edge sharpening
was better in the IPA-free systems as the number of prints increased and
the prints made by using IPA-free fountain solution were brighter.
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- 5. Use of nanoparticle binders for paper coatings: A review
- Pages: 39-43
- Bilge Nazli Altay, Steven Bloembergen, Cem Aydemir, Arif Karademir, Paul D. Fleming
- Abstract | Download | View
Abstract
Starch is a biopolymer that is used as a co-binder alongside synthetic
petroleum based latex binders for paper coating applications, though it
causes production downtimes due to the problems during cooking process,
such as gelling; lack of full expansion of starch granules; increase in viscosity
during cooling; bacteria growth in cooked starch and difficulties in viscosity
control during storage. On the other hand, synthetic binders negatively affect
paper recyclability and biodegradability. To overcome these problems, a
new biopolymer binder has been introduced to the paper manufacturing,
being used initially as a partial replacement for petroleum based synthetic
latex polymers. This study reviews the recent developments of nanoparticle
biopolymer binders, referred to as biolatex binders. These binders are
shipped dry and can be dispersed in water without cooking requirement
while improving paper quality and reducing costs of paper manufacturing.
They also provide quality benefits, coater runnability improvements and
new higher solids coating formulations for future product advancements.
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- 6. The characterization of microcapsules printed by screen printing and coating technology
- Pages: 45-56
- Rastko Milošević, Nemanja Kašiković, Tomislav Cigula, Urška Stanković Elesini, Raša Urbas
- Abstract | Download | View
Abstract
Depending on the microcapsules functionality, i.e. encapsulated core
material, nowadays microcapsules are used in various fields of application,
such as in medicine, pharmacy, agriculture, construction industry, chemical
industry, food industry, biotechnology, electronics, as well as in printing
and textile industry. In order to fulfil their basic purpose, microcapsules
have to be transferred onto the target areas of the substrate material
without damage, using different deposition techniques, mostly coating
and printing techniques. The aim of this research is to firstly investigate
the physical characteristics of the two selected fragranced microcapsules,
applied by screen printing and coating technique, and secondly to determine
how their addition in the selected three varnishes affected the basic
characteristics of the prints. Fragranced microcapsules were before printing
and coating adequately premixed with the selected varnish. The research
revealed that the characteristics of the fragranced microcapsules and the
varnishes as well as the used application techniques significantly affected
the behaviour of the fragranced microcapsules and their deposition in
the printed varnish layer as well as on the characteristics of the prints.
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