The coated stocks print up to 400 lines per inch screen images.
Laser printing : 300 to 600 dots per inch.
Screen printing : 45- 85 lines per inch.
However there is no such fixed resolution % stipulated in the case of Digital Images.
3. RGB: The Colored images formed by the Digitally generated images are based on the additive color theory whose basic colours are Red, Green, Blue which further creates secondary and tertiary colors. The Red, Green, Blue color space approximates the way the human eye works and produce all other colors visible to the eyes. The three additive colors Red, Green and Blue are therefore nicknamed as RGB.
4. Rainbow Printing: Read under Prismatic Printing
5. Rainbow Fountain : Putting different colors of ink in the same fountain with a small stopper in between each color to prevent them getting mixed up in the ink fountain itself, and then supplying the ink to the roller chain including oscillation roller which merge the colour edges to form a pattern of Rainbow . The Ink duct that carries more than two colour ink is called Rainbow Fountain. Read the function in detail under Prismatic printing.
6. Rag Paper : The good quality of paper for printing is made with high content of cotton rags, cotton clothes or cotton linters. The paper made with such pulp is called Rag Papers. The fibers on the Rag paper are longer than the wood pulp paper and therefore Cotton Rag made paper is viewed as more durable paper. The Rag paper is also called Acid free paper because their Ph is neutral. Normal paper like newsprint, note book paper, paper used on computer printers etc are mostly made of the cellulose fibers or wood pulp. Paper used for printing the Currencies are made with pure cotton and linen pulp and this will indicate how important is the Rag paper. One of the biggest advantage of using Rag paper is the that it does not disintegrate easily. This is one unique quality of the 100 % pure Rag paper used for printing the Currencies. For other printing purposes where durability is important 10 to 25 % Rag content Paper is supplied.
7. Recycled Paper : The Paper manufactured by reprocessing the discarded, old and used paper is called the Recycled Paper. Paper recycling is the process of converting the waste paper into new paper recovering fibers from them. The Recycled Paper is used in many areas including use as writing, typing, photo copying, Newsprint Papers and for making gift articles, Paper trays, Egg baskets, Greeting cards, Cover papers, Corrugated Boards etc. The Recycled paper is also used for making tissue and sanitary papers. Since converting the Recycling the Paper into high quality paper is a costly process, the Recycled paper is used for limited purposes as stated above .
Which are the paper that are used for recycling to convert them as re usable paper ? The Paper trimmings from the Presses, the waste and torn paper from the paper mills and printed material like News Papers, Magazines etc which are however bleached to remove the inks from them before re using for manufacturing white paper.
However the trimmings from the 100 % rag content paper from the Currency note manufacturing paper mills are re-pulped in the mills itself and mixed in small proportions with the good pulp for making paper. The reason for mixing in small proportion is that the recycled paper will have shorter fibers length compared to the longer fiber paper manufactured, and more % of the recycled paper will reduce the strength and alter the other properties of the paper.
The contaminated material such as paper used for food packing, plastic, metal, and other trash, etc are to be separated from the waste paper load collected from various sources as they can not form pulp for manufacturing the paper.
Contaminated paper and printed paper waste which cannot be recycled are composted, burned for energy in industries where industrial boilers are in operation etc and or land filled.
The waste paper load that includes the Corrugated boards and Kraft paper are sorted to separate them as the pulp made with them will not produce durable writing paper. More over originally made with wood pulp, they will cause Off shade instead of white paper. On an average only 70-75 % of the paper waste is converted as re usable paper for above said purposes.
The few steps involved in recycling process are:
Collection from various sources
Waste paper segregated as printing paper and corrugated boards and Kraft papers.
Sorted paper lots crushed or trimmed to pieces
Adding certain chemicals the trimmed lots are thoroughly washed and pulped
The Pulp is filtered through sieved screens of various size holes to remove un noticeable plastic and other impurities
The Paper thus filtered is colored with dyes to make colored paper or if white paper is to be produced, they are bleached. Depending upon the paper manufactured, the processing is arranged with suitable chemicals and materials.
Once the pulp is ready it is pressed into the Paper making machine and Paper made.
alphabet R to be continued under R/2