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0. Complete issue
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1. Online Workflow Puzzle
- Pages: 5-9
- Thomas Hoffman-Walbeck, Richard Adams
- Abstract | Download | View
Abstract
We are presenting an online workflow puzzle, which runs in a browser.
The player can put together puzzle pieces to pre-defined production
chains. Extensive online help supports the player in laying out the
puzzle pieces correctly. The puzzle is based on the process-resource
model, which is also the basis of the Job Definition Format. This
paper explains the game as well as implementation strategy.
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2. An investigation on skeleton-based top-down modelling approaches of complex industrial product
- Pages: 11-21
- Claudio Ciaccioli, Anna Eva Morabito
- Abstract | Download | View
Abstract
In industry, today’s approach to assembly design is still largely based on a
bottom-up approach which, in contrast with the most advanced top-down
techniques, is unfit to deal with very large and complex products. The
reason for this lies in the high number of relationships to be established
between parts and in the lack of a high-level control of the assembly
design. This makes the management of design changes a labor-intensive
process and the capture of design intent difficult to achieve. The paper,
referring to the most advanced research fields of Concurrent Engineering
and Knowledge-Based Engineering, focuses on a top-down modelling
approach based on skeleton, which constitutes the most natural but still
scarcely exploited way to attain a high reactivity to design modifications.
Through the application of suitable methodologies, such as that one for
a SKeLeton geometry–based Assembly Context Definition (SKL-ACD), the
skeleton is also able to capture and codify assembly process engineering
information since the early phases of the product development process.
With the purpose of promoting the knowledge of these skeleton-based
modelling techniques, that have a great relevance for training professional,
technical and mechanical engineers, this paper implements the SKLACD
methodology to an industrial case study in order to identify, with
a unique and repeatable workflow, the reference geometrical entities
and the mutual relationships to embed into the product skeleton. The
skeleton types and the related fields of use are also described, placing
particular emphasis on problems or shortcomings still not resolved,
especially in consideration of the need to assist the designer in defining
the impact of a parameter on assembly modification and in avoiding
loops while defining formulas. A new tool, in the form of a multilayer
graph, is finally proposed that is able to display and differentiate
clearly the formulas, the design parameters and the impact of their
modification on skeleton entities and members of the assembly.
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3. Aiming for G7 Master Compliance
through a Color Managed Digital
Printing Workflow (CMDPW):
Comparison of Compliance with
Output Device Profile (ODP) vs.
Device Link Profile (DLP)
- Pages: 23-35
- Haji Naik Dharavath
- Abstract | Download | View
Abstract
The purpose of this applied research was to determine the influence of
device link profile (DLP) in the color reproduction aimed at the G7 master
compliance. The quality of digital color printing is determined by these
influential factors: screening method applied, type of printing process, ink
(dry-toner or liquid-toner), printer resolution and the substrate (paper).
For this research, only the color printing attributes such as the G7 colors
hue and chroma, gray balance, and overall color deviations were analyzed
to examine the significant differences that exist between the two output
profiles [Output Device Profile (ODP) vs Device Link Profile (DLP)]. These are
the color attributes which are monitored and managed for quality accuracy
during the printing. Printed colorimetry of each profile from the experiment
was compared against G7 ColorSpace GRACoL 2013 (CGATS21-2-CRPC6) in
CIE L* a* b* space using an IDEAlliance (Chromix/Hutch Color) Curve 4.2.4
application interface with an X-Rite spectrophotometer with an i1iO table.
The measured data of each profile were run through this application (Curve
4.2.4). The data were analyzed by using the Verify Tool of the Curve 4.2.4
application to determine the pass/fail of G7 master compliance levels using
G7 ColorSpace tolerances (G7 Grayscale, G7 Targeted, and G7 Colorspace).
Analyzed data from the experiment revealed that the printed colorimetric
values of each profile (G7 Grayscale, G7 Targeted, and G7 Colorspace)
are in match (aligned) with the G7 master compliance levels (reference/
target) colorimetric values (G7 Grayscale, G7 Targeted, and G7 Colorspace).
Therefore, the press run was passed by the Curve 4 application for both
the profiles used/tested towards aiming for G7 master compliance.
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4. Optimization of flexographic
print properties on ecologically
favorable paper substrates
- Pages: 37-44
- Tamara Tomašegović, Jesenka Pibernik, Sanja Mahović Poljaček, Anđela Madžar
- Abstract | Download | View
Abstract
Nowadays, the attention in many industries is shifting towards the problem
of waste overproduction and production of the waste in general. This study
aimed to find an alternative approach to the production of packaging
which will be environmentally friendly and at the same time optimal in
terms of the print quality. This was accomplished by using the minimal
needed amount of material for the production of packaging and adjusting
the parameters of the flexographic printing process to achieve the desired
visual impression of the print. The designed motive for the packaging
was printed on five different recycled papers, following the guidelines
of sustainable design. Printing was performed on each recycled paper
with different printing pressures (50N, 150N, and 400N). Smoothness
was measured on each paper; and for every printed sample, colorimetric
measurements and thickness of the lines in positive and negative were
measured. Print contrast for each print was calculated, and microscopy of
fine printed elements was performed. All chosen papers except one had
average smoothnes of up to 3.2 s (the smoothest paper had the average
smootheness value of 54.72 s). Smoothness results influenced the printed
line widths. Specifically, when increasing the printing pressure, a significant
deformation of the line width has occured on all papers except the smoothest
one (deformations of the lines printed in positive were up to 400 μm for
rough papers compared to maximum of 60 μm for lines printed on the
smoother paper). Similar results were obtained for the lines printed in
negative. Furthermore, legibility of the printed typographic elements of 4pt
size was significantly influenced by the smoothness of the paper. Elements
printed on the smoothest paper have displayed the negligible deformations
when changing the printing pressure. For other papers, elements in positive
were optimally printed by 50 N pressure, and elements in negative by the
pressure of 400 N. The results of this research have enabled the optimization
of the flexographic printing process when using each of the five types of
recycled papers. Furthermore, the presented qualitative and colorimetric
parameters of the prints enabled the assessment of the applicability of
used papers as printing substrates for ecologically favorable packaging.
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