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The Coated, Uncoated and Wove Papers
This blog follows on in the series of blogs pertaining to the process of paper making.

By the final step of the paper making process, the papers are not yet coated. The coated papers have a thin layer of material for example china clay, either on one side or on the both sides, to produce a more suitable surface for a higher resolution print. Uncoated papers are very seldom utilized for screens above 150 lpi, as this type of paper is not really suitable for this application.

Polishing by calendering may be performed for both coated and uncoated papers. There are several types of coated papers: matt, semi-matt or silk, and gloss. Gloss papers are the best on optical density for a printed image.

The paper is processed onto reels if it is required for printing applications. The fibers within the paper principally run in the machine. In general, these sheets are cut "long grain", for example: the grain is parallel to the longer length of the sheet.

Fourdrinier-type machines produce woven papers. A pattern, which has similar density in the paper grain, is created by the wire mesh, which transports the web. Appropriate rollers in the next stages of the machine can create wire patterns, which imitate the hand made laid paper.

When it is made by hand in a mould of rows of bamboo or metal wires, woven papers do not display "laidlines", which are small lines left on paper. These lines are very close to each other, they move perpendicular to the "chainlines" that are further apart. Handmade papers display "deckle edges", or feathery and rough borders.

Follow the journey of papers and get to know more about papers in our next blogs.

by Mary and Ali
 
 
 
 
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