What is Paper ?

What is Paper

The raw material is wood, straw, moss and other vegetable materials.

Name of Paper in Printing Language

In the printing industry, the paper is classified according to the first form of the dough - the second dough - the third dough, that is to say according to the form of production. Apart from these, there are also paper types with different characteristics under all kinds of names. Remember what these varieties are and what you will hear the most.
 

Pastry Paper: Cellulose in its composition is very woody.

Pastry paper: The proportion of wood and cellulose in its composition is immediately, almost equal.

Pastry paper: The proportion of wood in its composition is too low for cellulose.

Coated paper: A glossy, matte quality paper with 5% wood in its composition.

Pelur: Very thin and lightweight paper.

Packaging Paper: Paper made from low quality pastry wrapped in thick and heavy materials.

Autocorrection papers: The type of paper that has the same writing in its lower case when it is written in the upper copy.

Aydınger: Slippery, transparent special paper used mostly by architects.

Paper of Ozalit: Paper that is coated with a light-sensitive material, which is used to reproduce pictures and texts from patterns.

Offset Paper Quality
 

Paper is very important to be able to print very well and to achieve very fast print speed. The qualifications sought for paper to be used in offset printing for this are as follows.

The surface should be smooth (not wavy)

The cut must be smooth

It must be cut into paper water

It must be prone to pressure. (In terms of fiber and filling materials)

Nematode should be normal% 60-65

Must be well stocked

It should not be too dusty

 

Loss of "Ph" in Paper on Printin

Paper with a high pH value causes the printing plate to deteriorate. Since the offset is a completely water-operated system, the moisture on the rubber is always in contact with the paper surface. As water is a kind of solvent, acidic rubber in the paper is transferred to the acidic plate in the rubber, which causes the pressure plate to be lubricated, thus causing the PLACANIN FLOW. At the same time, the acidity increases the pH value of the reservoir water by passing through the watering rollers moisturizing the plate and thus the pressurized reservoir water.

 

Rear Leaf of Paper (Pollution)

The ink absorption of the paper is usually related to its surface. The ink thickness on the paper surface is very important. The ability of paper to absorb ink is very important. Often the ink builds up on the paper surface as a result of oxidation. If the surface is low in suction power, inking on paper is very slow and the backing occurs.

Rearrangement; the second layer coming into contact with the inking layer in the printed surface is contaminated with the surface of the paper. This term is confused with the fact that a job that prints dark on the front of the paper is visible behind the paper.

 

Water Direction of Paper

The water of the paper refers to the direction of motion (direction of tissue) from the pulp to the continuous sieve during manufacturing. Because cellulosic fibers extend in this direction and become felted.

The most practical procedure for finding the water direction of a paper is as follows: A piece of paper is folded transversely and longitudinally. The folded areas are slightly moistened and drawn with a nail. After this process, the wavy side of the paper indicates that the water is reversed. Because cellulose fibers are broken in this direction and cause paper to ripple. The other non-rippling side shows the side of the paper where the water is directed. The paper's way of water is extremely important in printing and in the skin.
 

Detecting Paper Water

The paper tapers more smoothly in the direction of the water.
Otherwise, it is more hairy and the curve is torn.
The paper is more tufted in the direction of the water.
When the paper is dehumidified or releases moisture, it extends further in the direction of the water.

 

Control of Paper Quality

The surface of the paper is controlled by visual inspection under hand light and by hand touch.

In order to recognize the cleanliness of the paper, it should be checked with lup by lighting from top and bottom.

The integrity of the paper can be understood by folding it several times and tearing it across its length.

The thickness of the paper is measured by measuring with a micrometer.

It is possible to understand whether the amount of glue in the paper is small or too large, by pulling the lengthwise lines with an ink pen on the paper. If the ink does not spread on the paper and does not penetrate into the back, we can say that the paper is full glue. Thin lines do not spread and do not go backwards, but thick lines are spread and this paper is half glue if it goes back. If both lines go backwards, we can say that there is little glue or no glue.

We know when a piece of paper is passing through the air or by lighting candles underneath. Airless paper will remove many air bubbles when the candle is lit under it.

It is understandable when the paper is lighted, something printed on it is placed and viewed.

It is very important whether the paper is dusty or not. During printing, it will damage the rolls of the machine, so it is checked whether it is dusted by wiping it with a black cloth or wiping the paper to be tested on a black paper.

A surface is wetted to absorb the paper's absorbency. The absorbent paper pulls the water quickly.

The paper is pressed against the surface with a wet fingertip and pulled out quickly to see if the paper will pass through the print.