Paper manufacture using the "testliner white"


Pre-University Paper, 2009
9 Pages, Grade: 1,0

Excerpt

Table of Contents

List of figures

List of abbreviations

1. First Part: Introduction to the Pulp and Paper Industry, the machines and the usability around the world

2. Second Part: Progress of fabricating the product

3. Dependency on business cycle (early indicator of recession)

Sources

List of figures

Figure 1 Recoverd Paper

Figure 2 Defibration (pulper up 130)

Figure 3: Some refiner

Figure 4 Dry line at head box

Figure 5 Procuced reel

List of abbreviations

Abbildung in dieser Leseprobe nicht enthalten

1. First Part: Introduction to the Pulp and Paper Industry, the machines and the usability around the world

Since the invention of paper in Egypt 3500 BC[1], when it was produced by using the papyrus plant, paper is one of the most important consumer goods of the world.

For example in Germany, the paper consumption is as high as nowhere else in the world. A German citizen wastes round about 236 kg paper per year[2]. With the total waste of the popu-lation of the federal republic you could construct a tower of standard paper size sheets from the earth up to the top of the moon.

The pulp and paper industry produces approximately 393[3] million tons of paper for instance writing paper, industrial paper, pasteboard and cardboard per year. This shows how essential the product paper is. When you think about paper you normally mean writing paper, paper for newspapers or graphic papers for photography or high resolution magazines.

But paper can be used in completely different ways depending on the products:. For exam-ple It is used in the building industry, car manufacturing and other industries; you need it for hygiene products like tissue papers, for car poll filters or for packages for comestibles or any other goods.

Paper appears in different grammages and quality. All these products are produced on several paper machines with different breadth For example there are paper machines in China with a breadth of 20 meters. These plants normally fabricate only one product of one grammages and same quality.

The paper mill I work at, has a machine width of only 4,90 meters. Because of this fact it is comprehensible that one has to produce many different kinds of paper in order to be able to exist on the buyer's market for a longer period of time.

This machine has a technical capacity of 220,000 tons per year and a turnover of 52 Million Euros. There are two major products produced on the PM1: testliner brown, white and plas-terboard liner (grey, ivory and green).

2. Second Part: Progress of fabricating the product

I want to give a short outline of the fabrication paper on a “double fourdrinier machine” using the example of testliner white. Yonder is one of the main products for the packaging industry. The product consists of two plies: A brown underlayment (70 % of the paper) and a white top ply (30 % of the product).

To fabricate paper you need three sorts of raw materials. First of all you need recovered paper or cellulose. Owing to the increased costs it is better to use recovered paper (one ton of recovered paper has a market price of 45-56 €[4], and cellulose has got a market price of 450 – 470 €).

Recovered paper is not qualified for every kind of paper production, because its fibres are more and more destroyed after every recycling progress. But these fibres are important for the sheet formation and resistance of the paper.[5]

Abbildung in dieser Leseprobe nicht enthalten

Figure 1 Recoverd Paper

The second raw material is water. You need lots of water, on average 6-7 litres per one kilo produced paper to defibrate the recovered paper or cellulose.

The last important raw materials are the chemical additives. You need them for the produc-tion progress. For example you need it for the paste application so that the end product is water-repellent. Or in order to abort the frothing of the stock chest water.

In the first step of the production you have to defibrate the recovered paper or cellulose in so called pulpers. These are big tubs filled with hot water and an agitation device. At this junc-ture the fibres are pressed by a centrifugal force on the border of the pulper. The waste mate-rials (for example styrofoam, plastic or scrap) are collected by the pulper rope in the middle of the pulper and transported to the Reject-Section, where the waste materials are collected and later brought to a dumpsite. In this connection it is important that you have a low reject proportion in the recovered paper, because of its high disposal costs.

Abbildung in dieser Leseprobe nicht enthalten

Figure 2 Defibration (pulper up 130)[6]

After the defibration the the pulp (also called slurry) passes through the stock preparation. Here the slurry is cleaned in the “Axial Turbo Separators”, which are huge barrels, where the mixture of water, contaminants and fibres is filtered.

After that the pulp passes the refiners, which can be compared to huge coffee mills. The dif-ference is that you mill the fibres and not coffee. This is a very important operation of the production. Without it the fibres cannot conjoined to each other, because the specification of the paper has to be maintained.

Abbildung in dieser Leseprobe nicht enthalten

Figure 3: some refiner

After having been milled the slurry passes the cleaner – section. The cleaner-section consists of many centrifugal hoppers, which separate the fibres from the contraries.

The pulp is now ready to pass the headbox. Now it is collected in the vat and extruded with high compression onto a moving wire, which the papermaker speaks of “sheet forming”.

Here the water is hoovered by lots of vacuum cleaners at the foils. But this water is recycled and brought back to vet, which you call this the “wire water”. Underneath the wire there are lots of the foils. The difference to other paper mills is that the

Abbildung in dieser Leseprobe nicht enthalten

Figure 4 Dry line at head box[7]

[...]


[1] http://papiergeschichte.freyerweb.at/tafel1.html abgerufen am: 10.06.2009

[2] http://www.ich-habs-papiert.de/facts_papierverbrauch.php abgerufen am: 10.06.2009

[3] http://www.vdp-online.de/pdf/Kompassdeutsch.pdf abgerufen am: 10.06.2009

[4] EUWID Papier und Zellstoff Nr. 21 v. 20.05.2009

[5] „Der kleine Papiermacher“, Dr. Curt Haefener-Verlag GmbH im Auftrag der Fachverbände der Deutschen Papierindustrie e. V.

[6] own photography

[7] own photography

Excerpt out of 9 pages

Details

Title
Paper manufacture using the "testliner white"
Course
Englisch
Grade
1,0
Author
Year
2009
Pages
9
Catalog Number
V448473
ISBN (eBook)
9783668829954
Language
English
Tags
Paper manufacture, testliner, paper industry, pulp and paper, Recoverd Paper
Quote paper
Benjamin Wagner (Author), 2009, Paper manufacture using the "testliner white", Munich, GRIN Verlag, https://www.grin.com/document/448473

Comments

  • No comments yet.
Read the ebook
Title: Paper manufacture using the "testliner white"


Upload papers

Your term paper / thesis:

- Publication as eBook and book
- High royalties for the sales
- Completely free - with ISBN
- It only takes five minutes
- Every paper finds readers

Publish now - it's free