economic impact of the hybrid screening in the print runs of offset sheet

Economic Impact of the Hybrid Screening in the Print Runs of Offset SheetIgnacio Villalba / Manuel Vacas

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Economic Impact of the Hybrid Screening in the

Print Runs of Offset Sheet

oIgnacio Villalba Romero. Instituto Tecnológico y Gráfico TajamarC/ Pío Felipe, 12 28038 — Madrid. Office T-09. Ph.: 0034 91 477 25 00. [email protected] Vacas Galán. ORYMU GRAPHIC ARTS C/ Ruiz de Alda, 3-5. 28320 Pinto -Madrid. Ph.: 0034 91 691 40 13. [email protected]


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Reasons for this research

The goal of this work is to clarify the economic impact which implies the Hybrid ScreeningUsage (XM) in comparison with Conventional Screening Usage (AM)

in Offset sheet printing.

Orymu Graphic Arts, is the largest Offset sheet printing company in Spain.

Orymu´s offer is one of the most competitive in comercial printing in Europe.

El Instituto Tecnológico y Gráfico Tajamar traines and advices

Graphic Arts Sector companies

The Quality Department detected the lack of research concerning the screening matter

Orymu´s experts believe that there should be less ink consumptionUsing Hybrid Screening than conventional screening

The need of researching both screenings methods arised.


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Work FlowSTATEMENT HYPOTHESISSTATEMENT HYPOTHESIS

RESEARCH OBJECTIVESRESEARCH OBJECTIVES

WORK METHODOLOGY WORK METHODOLOGY SECONDARY SOURCES SUPPORT

SECONDARY SOURCES SUPPORT

PRIMARY SOURCES: EMPIRICAL DATA OBTAINED

PRIMARY SOURCES: EMPIRICAL DATA OBTAINED

EMPIRICAL COMPARISONEMPIRICAL COMPARISON

CONCLUSIONS GOALS ACHIEVEDCONCLUSIONS

GOALS ACHIEVED

HYPOTHESISASSESSED

HYPOTHESISASSESSED


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1. Hypothesis

“The job with hybrid screening involves a saving of ink with regards to conventional screening with similar resolution and visual appearance”


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2. Main Objective

• To determine and quantify the cost ink decrease which implies the use of hybrid screening (XM) faced with conventional screenings (AM) in the productive process in offset printring companies.


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2.1. Secondary Objectives

• To check the true stability of the XM screening

• To compare visually the printing result of conventional screening images with the same images printed with hybrid screening.

• To find and assess the variables which usually affect the graphic production process in a conventional printing company.


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3. Methodology


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4. Secondary Sources

• We looked for information related to the research and we found as follows: – The Lisi & Baitz (2006) studies proved

the use of frequency modulation screening reduced the ink consumption during the printing by 22%.

– Agfa-Gevaert N.V presents its SUBLIMA screening with the advantages of using the AM & FM screening.


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5. Experiment development• It was based in a print run which

allowed the ink compsumtion comparison in two test screened in a different way.

• The print conditions were the same.• The samples were cut and weighed to

evaluate the consumptions.


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5.1. Print Test Features


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5.2. Print Test45 cm. (17,7 inch)

35,7 cm. (14,1 inch)


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5.3. Materials used

• Agfa SUBLIMA XM 240 lpi screening.(minimum dot size 21 micron)

• Conventional screening of 175 lpi.• Matt Coated paper of 115 gsm/m2

• Printed in large format Mitsubishi press four colors 5G format 96 x 132 cm. (37,8 x 52 inches.)


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103,1 x 91,6 cm. (40,6 x 36,1 inches) 103,1 x 91,6 cm. (40,6 x 36,1 inches)


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5.4. CTP Linearity


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5.5. Plates generation

• Lastra LT2 thermal positive plates• Platesetter Agfa Xcalibur VLF 7 • ISO Coated v2 (ECI)• Composition: Adobe® InDesign® • PDF/X-1a:2001 Files• Agfa ApogeeX workflow • Agfa DQS (Digital Quick Streep) system


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5.6. Measure of dot gains

• Mitsubishi Central Color System press adjustment


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5.7. Color measurement: conditions

• In accordance with 12647-2 standard.• In dry conditions.• Using spectrophotometer X-Rite 530.• On black background.


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5.8. Color Measurement


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Comparison againstISO 12647-2

CYAN 1,51 MAGENTA 1,56 YELOW 1,40 BLACK 2,03

Lab (12647-2) 54/-36/-49 46/72/-5 88/-6/90 16/0/0

Test Lab 54,70/-36,40/-48 46,27/72,62/-3,59 84,82/-3,74/92,68 13,34/-1,14/0,01

∆E 1.27 1.56 4.73 2.88


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5.9. Second print. Dot gain matching


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5.9. Color measurement


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5.10. Samples cut and weighing

• Cut using a POLAR 137E trimmer• Printed sheets and non-printed sheets were cut.• Samples of 10 sheets set against each other, 5

from up side and 5 from down side, from screening XM and screening AM.

• 15 samples were obtained from each screening type and 15 from non-printed paper.

• The samples were weighed on a very precise Bel Engineeriing Mark 0.01 balance


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6. Results


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Consumptions per 10 sheets of 480x387 mm format.

Extrapolating:


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7. Conclusions• A company with a printing volume close to

100 millons sheets per year and with an ink compsuntion of around 25.000 kg, could reach an ink saving near the 20%.

• The ink charges are considered between 200 and 340%.

• For example, in the publishing market of graphic color edition, where the text and the white areas covers a high percentage of the printed surface; a saving within 5 and 10% could be achieved.


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8. Reasoned Hypothesis

Thank you for listening

economic impact of the hybrid screening in the print runs of offset sheet

Business

hybrid screening involvesa

sublima screening

lpi screening

fm screening

print runs of offsetsheetall

use of hybrid screening

print runs of offset

conventional screening