scholarly journals OPTIMIZING THE ROLE OF INKING UNIT IN OFFSET PRINTING MACHINE

KREATOR ◽  
2021 ◽  
Vol 2 (2) ◽  
Author(s):  
Juliandri . ◽  
Anton Hadiwijaya ◽  
Yessy Yerta Situngkir
Keyword(s):  
Offset Printing ◽  
Printing Process ◽  
Maintenance Schedule ◽  
Potential Problems ◽  
Routine Procedures ◽  
Printing Machine ◽  
Standard Operations

In-depth observations have been made on the printing process using the Heidelberg Speedmaster CD 102 machine. In this process, the ink unit becomes the biggest concern because of its role in the quality of the printout. Observations are made directly in the field on routine procedures carried out and discuss events in the field to identify problems and determine actions. The results of the study indicate that there are several things that must be improved related to the routine maintenance schedule, the technical setup of the inking unit and identification of potential problems as a reference for improving standard operations in the field.Keywords—Inking unit, offset printing machine, speedmaster machine

scholarly journals A Study on the Assessment of Quality of Printed Sheets in Offset Sheet-Fed Printing 

2021 ◽  
Vol 31 (1) ◽  
pp. 41-45
Keyword(s):  
Quality Management ◽  
Total Quality Management ◽  
Quality Parameters ◽  
Low Density ◽  
Total Quality ◽  
Offset Printing ◽  
Pareto Chart ◽  
Printing Process ◽  
Ishikawa Diagram

The quality parameters of printed sheets should be controlled constantly during the sheet-fed offset printing process. This allows the detection of any problems in the initial stages of the printing process. The final control of the quality of printing sheets will eliminate error products before delivering to the costumers. The results of this control should be analyzed continuously. The total quality management (TQM) is an effective method in controlling, doing statistics, and assessing the errors in the offset printing process. Simultaneously, this method delivers the main errors frequently occurred in the printing process. This paper presents the possibility of using some tools of the TQM method such as Pareto chart, Ishikawa diagram, and 5xWhy to analyze and assess the quality of printing sheets in sheet-fed offset printing. The studied results show that the two main errors of the printed sheets are hickeys (occupied 29 %) and low density (occupied 17%). Moreover, the causes of hickey error are analyzed and shown in this paper.

scholarly journals Preventive maintenance features specific to offset printing machines

2021 ◽  
Vol 343 ◽  
pp. 08012
Author(s):  
Emilia Bălan ◽  
Liviu Berculescu ◽  
Răzvan-George Răcheru ◽  
Dorin Vasile Piţigoi ◽  
Lucia Adăscăliţa
Keyword(s):  
Preventive Maintenance ◽  
Offset Printing ◽  
Printing Process ◽  
Machine Performance ◽  
Continuous Quality ◽  
Study Results ◽  
Maintenance Activities ◽  
Printing Processes

In the printing industry, where production never stops, it is very important to continuously maintain machine performance. If a machine breaks down, the production will stop and it will disturb the production process. Therefore, the maintenance system must be managed efficiently to solve those problems. The paper presents the study results on continuous quality improvement of offset printing using preventive maintenance features. Offset printing is a process that involves a multitude of variables, independent and interdependent factors. The offset printing process was analyzed and the factors that have a significant influence on the quality of the process and the products made were identified. The defects that may occur during the printing process and the causes thereof have also been identified and the types of non-conformities of the end products were estabilished. The experimental method was used. The case study was conducted on Manroland 508. For the planning of preventive maintenance activities, the duration of the maintenance works necessary to ensure the proper functioning of the offset printing machines was established. Finally, maintenance activities that would guarantee and continuously improve the quality of the printing processes and the printed products were issued.

scholarly journals Back-trap mottle: A review of mechanisms and possible solutions

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 6426-6447
Author(s):  
Hak Lae Lee ◽  
Hye Jung Youn ◽  
Ming He ◽  
Jiachuan Chen
Keyword(s):  
Coating Layer ◽  
Offset Printing ◽  
Coating Structure ◽  
Paper Substrate ◽  
Coated Paper ◽  
Printing Process ◽  
Coated Papers ◽  
Coating Uniformity ◽  
Color Density

Print mottle is a serious and common uneven printing defect that occurs when printing coated paper by the offset multicolor printing process. It is characterized by a non-uniform appearance in terms of brightness, gloss, or color density that appears mostly in solid printed areas. Back-trap print mottle and water-interference print mottle occur when the quality of the paper substrate, especially the coating layer quality, is not satisfactory. To cope with this quality problem of coated papers, the understanding of the offset printing process, the requirements of coated-paper quality, and the reasons for this problem should be addressed. In this review, the basic process of offset printing and the mechanisms of print mottles were explored, the importance of coating uniformity in both the coating structure and process was reviewed, and the approaches to cope with print mottle were introduced.

scholarly journals PROBLEM RELATED PAPER TENSION AND ITS SOLUTION IN NEWSPAPER PRODUCTION USING WEB OFFSET PRINTING MACHINE

KREATOR ◽  
2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Mawan Nugraha ◽  
A Sarmada ◽  
Ari Dwi Yulianto
Keyword(s):  
Offset Printing ◽  
Printing Process ◽  
Upstream Process ◽  
Related Paper ◽  
Printing Machine ◽  
The Web ◽  
Main Material

In-depth observations have been made on the web printing process for newspaper production. Observations were made to identify problems related to the tension of the roll paper used in the production of newspapers. The problem of roll-paper tension is observed from the main material, the upstream process (Reelstand Unit), the printing process and its supporting units such as the wetting unit, inking unit and in the folder unit which is a contineous process. From observing the problems in the printing process, the causes and solutions to the problems were identified which were then used as an operating standard reference for the newspaper production using a web offset printing machine.Keywords—web offset printing machine, newspaper, paper tension

scholarly journals Inkjet printing of silk: factors influencing ink penetration and ink spreading

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Saira Faisal ◽  
Muhammad Ali ◽  
Sheraz Hussain Siddique ◽  
Long Lin
Keyword(s):  
Inkjet Printing ◽  
Design Methodology ◽  
Marked Effect ◽  
Fractional Factorial ◽  
Printing Process ◽  
Content Type ◽  
Textile Fabrics ◽  
The Right

Purpose Pretreatment of fabric with a number of chemicals and auxiliaries is a prerequisite for inkjet printing. Owing to the rapidly increasing use of inkjet printing for textile fabrics, the study of the effects of process variables on various characteristics of the resulting print has drawn considerable interest recently. The purpose of this paper is to study the effects of different variables associated with the inkjet printing process on the quality of the resulting print. Specifically, the effects of chemicals and auxiliaries used in the pretreatment of the fabric prior to printing and factors such as steaming time were studies. Design/methodology/approach In the present study, which forms a part of a larger study by the authors, the influence of the nature of thickener, the amounts of thickener, urea and alkali, pH of the pretreatment liquor and the duration of steaming on ink penetration into the printed fabrics and the ink spreading across the fabrics was studied. The nature of ink penetration and ink spreading are known to have pronounced effects on the quality and, in turn, the overall appearance of the resulting print. A set of experiments based on a blocked 25–1 fractional factorial design with four centre points were conducted to evaluate the role of the aforementioned five variables. Ink penetration was quantified on the basis of the principles of Kebulka-Munk theory while ink spreading was analysed by image analysis. Findings Detailed statistical analyses of the experimental data obtained show that different thickeners perform differently and can have a marked influence on ink penetration and ink spreading. In the case of polyacrylic acid-based thickener, changing the levels of the factors has a marked effect on ink penetration and in-turn on ink spreading. In the case of polyacrylamide (PAM)-based thickener, on the other hand, the effect of changing the levels of various factors on the ink penetration and ink spreading is considerably less pronounced. In addition, PAM treated samples exhibited better performance in terms of ink penetration and spreading. Originality/value This study provides useful information for textile printers and highlights the importance of selecting the right type of thickener to make the printing process and the quality of the resulting print more predictable and controllable.

scholarly journals Maintenance Preventive Scheduling of Critical Components in Offset Printing Machine (Case Study : PT. XYZ)

Tibuana ◽  
2021 ◽  
Vol 4 (02) ◽  
pp. 110-119
Author(s):  
Marcy L. Patiapon
Keyword(s):  
Production Process ◽  
Critical Component ◽  
Offset Printing ◽  
Maintenance Schedule ◽  
Machine Maintenance ◽  
Reliability Centered Maintenance ◽  
Critical Components ◽  
Printing Machine ◽  
Component Replacement

Maintenance activities are generally considered as supporting activities in the production process. However, this activity is very important because it contributes directly to the smooth running of the production process and productivity. PT. XYZ is a company engaged in mass media or newspapers since September 8, 2015. In the newspaper production process, PT. XYZ experienced delays in the production process due to damage to the component parts of the printing machine, in which the Offset printing machine is the core printing machine that is always used to print newspapers. Based on data on the frequency of damage during 2020 which was obtained from observations and interviews with operators, damage to machine components for 1 year on the offset printing machine counted 73 times that it was damaged. Thus making the machine stop operating from the effective working time of the machine, which is 264 days/year. This is due to the unavailability of a machine maintenance schedule because the company is still implementing a breakdown maintenance system. Thus the researcher aims to calculate the value of the identified critical components and calculate the effective time of machine operation for scheduling replacement of critical components of offset printing machines using the Reliability Centered Maintenance method. Based on the results of data processing using the Reliability Centered Maintenance method, the contactor component is determined as a critical component where the value of the Risk Priority Number is 72 with an average checking time of 11,250 minutes and component replacement time of 7 times/year. For this reason, it can be concluded that the contactor is a critical component with a damage value of 72 and the scheduling time for component replacement is 7 times in 1 year.

Cognitive Health Counseling 40+

2013 ◽  
Vol 21 (1) ◽  
pp. 24-33 ◽  
Author(s):  
Anne Eschen ◽  
Franzisca Zehnder ◽  
Mike Martin
Keyword(s):  
Outcome Variable ◽  
Pilot Phase ◽  
Subjective Memory ◽  
Cognitive Health ◽  
Health Counseling ◽  
Agents Of Change ◽  
Main Outcome Variable ◽  
Further Development

This article introduces Cognitive Health Counseling 40+ (CH.CO40+), an individualized intervention that is conceptually based on the orchestration model of quality-of-life management ( Martin & Kliegel, 2010 ) and aims at improving satisfaction with cognitive health in adults aged 40 years and older. We describe the theoretically deduced characteristics of CH.CO40+, its target group, its multifactorial nature, its individualization, the application of subjective and objective measures, the role of participants as agents of change, and the rationale for choosing participants’ satisfaction with their cognitive health as main outcome variable. A pilot phase with 15 middle-aged and six older adults suggests that CH.CO40+ attracts, and may be particularly suitable for, subjective memory complainers. Implications of the pilot data for the further development of the intervention are discussed.

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