Printing Inside E-Book

Uwe Schulczek

• Herausgeber: Books on Demand
• Kategorie: Wissenschaft und neue Technologien
• Sprache: Englisch

Seitenzahl: 72

Veröffentlichungsjahr: 2020

Beschreibung

For a long time now, consistent change has been observed in the printing industry. Those who still want to successfully be involved nowadays must above all be able to deliver high-quality products in a fast and flexible manner. Besides, cost optimization is a deciding factor. It is frequently observed that due to machine shutdowns, as well as printing technology typographical or technical problems, the printers get into bottleneck situations. Difficulties with delivery and complaints ensue. From this, enormously high costs soon originate, which needs to be caught as soon as possible, optimized against, or in a best-case scenario, eliminated entirely.

Leseprobe

Contents

Introduction

Disclaimer / Disclaimer of Liability

Basics / Prerequisite

1.1 Rollers

1.2 Rubber Blanket

1.3 Plates

1.4 Dampening Water

1.5 Ink

1.6 Substrate

1.7 Varnish

1.8 Powder

Analysis

Specials

3.1 Air Pressure / Pneumatics

3.2 Framing

3.3 Dot Gain

Introduction

For a long time now, consistent change has been observed in the printing industry. Those who still want to successfully be involved nowadays must above all be able to deliver high-quality products in a fast and flexible manner. Besides, cost optimization is a deciding factor. It is frequently observed that due to machine shutdowns, as well as printing technology (typographical) or technical problems, the printers get into bottleneck situations. Difficulties with delivery and complaints ensue. From this, enormously high costs soon originate, which needs to be caught as soon as possible, optimized against, or – in a best-case scenario – eliminated entirely.

Based on my 20-year-old work experience as a printing instructor and service engineer with the worldwide leading Printing Machine Manufacturers, I will describe efficient methods thoroughly, so that the exact sources of error can be localized, and measures can be taken as quickly as possible.

Of course, all maintenance intervals and cleaning work on the machines should be carried out on a regular basis. Unfortunately, due to increasing production pressure and default about cost reduction, this is not always possible. Also, by high spare part and engineer costs of her Machine manufacturers are made some printers not carry out any repair immediately.

If one can limit one’s mistakes and do examinations himself to plan then specific insertions, some costs can be lowered.

The goal: identifying sources of error and mastering the basics of error analysis.

In many cases the exact description and the reaction is already an issue, mostly due to insufficient communication and lacking localization.

In nearly 80% of the problems I have encountered and analyzed the Basics (basic conditions) are not given, understood or followed properly. 20% remain which one cannot influence, and which will always pose a problem.

However, if you yourself can localize only half of these 80% himself and initiate suitable measures, huge sums can be saved.

That's why I have split the book in three segments.

Basics / Prerequisite

Analysis

Specials

The Basics / Prerequisite will be the basic understanding of the influencing factors with printing machines which are most important to me without going too much into detail.

In the chapter Analysis, I will lay out the approach to the containment of the problems, focusing on typographical factors of influence.

In the last part of the book, the Specials, I will then deal with more specific topics applying to printing machines.

I wish you a lot of success and will gladly receive comments and feedback at:

[email protected]

You are also welcoming to visit:

www.druczek-service.de

Do you need some consulting assistants, or you will start new Projects around your printing – factory, feel free for contact me:

[email protected]

Disclaimer / Disclaimer of Liability

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1. Basics / Prerequisite

1.1 Rollers

The rollers of a printing machine are essentially its heart. They are present in every phase of the printing process and should be selected according to the situation.

Conventional ink

Hybrid (mix) of Conventional / UV

UV ink

Therefore, depending on application, the kind or the state of the rollers will change.

Which supplier to select, with which gum mixture and hardness to work, these should be decided individually. I would like to give only one personal statement:

The cheapest suppliers are not always the best choice!

My priority with rollers:

How are they adjusted and how does the surface look?

With the surface, it is important that it is velvety and useable. These are no fissures, damages or similar issues to be seen. It should neither look worn down nor swollen.

Diameter of the roller should correspond with that in the roller scheme, with a leniency of 2 mm in diameter and 0.5 mm in width. The bearings on the roller, including those inside the machine, should be in order.

Caution!This is also valid for Rilsan and chrome rollers, or distributors. Also, their surface is enormously important for the Ink or dampening water transporting.

Everyone knows Rilsan-Rollers, but what is Rilsan and what is its meaning?

Rilsan is a plastic coating made from polyamide (PA11). It is often of microcellular polishing (smooth) and has the following qualities:

resistant against abrasion, ink and chemicals

low ink and moisture absorption

Rilsan, in combination with the gum rollers, has proven to be a good ink flow transmission. Due to the Rilsan coating these rollers have a higher service life than gum rollers.

Every now and then these rollers can tend to “run blank”. This happens if residues from the dampening water in the form of lime, ink leftovers and roller leftovers stick to the coating and essentially seal it.

From this a “lotus effect” originates, which means that the Rilsan cleans itself and transfers no more ink.

Rilsan-coated rollers, distributors and dampening distributors can be cleaned very well with „PRO Gravure Cleaner”. Should the cleaning not do the trick anymore, the Rilsan-coating can be renewed.

I would like to draw attention to the dampening distributor in particular.

It has a microcellular chrome layer around the water; however, capillaries often join. A running dampening distributor affects the production.

The results:

Dot gain increases

Grids or grid courses touch

Framing

Too high dampening water levels

Important!The Dampening chrome roller must be water friendly.

1. Dampening chrome distributor rolls are not water friendly

With a small test, a quick judgement of its state can be made.