The published articles are meant to primarily educate the students in printing to supplement their knowledge in the field of Printing. These are not simple Glossary of printing terms, but to the extent possible every term has been explained in brief so that it can be of some use to the students who appear in some sort of examinations and interviews.
I served the Printing Industry for over 40 years
in various capacities, a major part in an Security Printing Organization. In order not to waste the printing and paper related knowledge which I gained over years, I decided to keep them in public domain for the reason stated in prepara. Most of the illustrations - over 90% - have been generated by me to explain the terms suitably.
While I am not sure to what extent the published content will help, if the content is going to be of use to some one in some manner, I will be greatly satisfied.
Your views may be sent to me (
nrj_1945@yahoo.com) for my record and correction wherever needed.

TOTAL NO OF PRINTING TERMS

POSTED TILL NOVEMBER, 2012

- Over 400 terms-

Click on this line to read from 'A'

Wednesday, November 7, 2012

Alphabet W /2

5. Web Break: In the Web printing machine paper reel will be loaded for printing. They will be loaded for printing taking into consideration the elasticity of paper. The web tension will be set accordingly to ensure that the reel runs smoothly from end to end. While the printing is underway, some times the reel may break and stop printing. The reasons may be many such as web or reel tension set between feeder to delivery end may be faulty, too much thickness variation in the Paper reel where the thin or weak portions can not withstand the web tension set, ripples, holes, wrinkles, wander or tear in the mid or edges of reel, impression pressure between plate and impression cylinders too high or sudden jerk due to voltage fluctuation, too much tacky ink etc, etc. In bigger machines and sophisticated presses, the web printing machines will be attached with Web break detector, which will instantly indicate the location of the breaks so that quickly it can be attended thus minimizing down time.
6. Wire side of Paper: Every paper manufactured has two sides. When the pulp pass over the wire mesh to form sheet of paper, however smoother the wire mesh may be, due to the wire mesh inherent structure, the side of paper on mesh will have roughness compared to the top side of the paper. Thus the bottom side of the paper that is in contact with the wire mesh  during manufacture  is called Wire side which will be slightly rougher and the top side which will be smoother as Felt side. However on coated paper the sides can not be distinguished. In the non coated paper, generally the felt side is preferred for printing as it will have smooth surface. Even on those   coated papers which have  water mark, the readable side of the mark will be felt side and the reverse of the mark side will be the  wire side.
7. Wood free Paper : The Paper is made of Cotton Rags, Cellulose fibers, hemp, esparto, other grasses like bagasse (the fibrous plant) and wood or straw. The  paper made without wood in the pulp  is called mechanical pulp. Those manufactured  purely with chemical pulp i.e cellulose fibers are called Wood Free Paper. The wood contains both cellulose fibers and wooden lignin (a natural component like polymers of the cell walls of the plants) which is naturally inherent in the secondary part of the wood. Though wood is crushed before adding with pulp, most of the lignin is removed allowing only the cellulose fibers in the pulp during the bleaching of the pulp.   The lignin is removed during bleaching process so that the paper manufactured do not turn yellowish in long run. The Newspapers, paperback books and some magazines whose paper will be duller in color are made from paper using mechanical wood i.e paper made without removing the lignin. 
8. Wire Stitching: One of the binding techniques like thread stitching and sewing of books. Wire stitching means fastening the loose leaves of the book with a half an inch or so length steel wires. This is a faster way of fastening the sheets compared to the thread stitching. Most of the weekly and monthly magazines are wire stitched. The wire stitching is carried either at the spine or a few mm away from the back edges of the book. The wire stitching done on the back edge of the book is called side stitching. Two varieties of wires are available for stitching. One is round shaped and the other flat shaped to suit different types of books or magazines. Generally where the books or note books are wire stitched in spine- saddle stitching- they will use round shaped wires. Where the stitching is done on the back edge of the books and magazines or card board boxes –side stitching- the wires are flat shaped. This is done to keep the wires lie flat on the surface so that when they are packed the edges will not be bulgy compared to the front edge. 

9. Warm colour : In color theory there are two groups of colors. They are termed as Warm and Cool Colors. It is generally stated that the color is indicative of the mood. Certain colors are very bright and some are sober. The bright or Warm Colors are Red, Orange, Yellow etc which reflect light or fire. Warm means bit hot. When fire is lit colors like Yellow, Orange and Red flames can be seen. Therefore the brighter colors are grouped as Warm Colors and lighter colors as Cool colors. The Cool colors are Blue, Green, Purple and Magenta etc which has blue tinge on them. 


10. Wrong Font: In typography while composing the matter, by mistake instead of the same font, one or two fonts of some other type may appear in the words. Such non uniform fonts are called wrong fonts. This happens generally when after the matter is printed, and the fonts are distributed back into their boxes the fonts may be put into the wrong boxes which gets mixed up by mistake. 


11. Web Printing: The Printing machine which can print only on continuous rolls of paper and even in emergency trimmed sheets can not be fed into the machine as the configuration of the machine has been designed so. The Web printing machines are attached with sheet converters which can trim the paper to individual sheet size during delivery after printing. The machine is also equipped to slit the bigger rolls to smaller size rolls and then wind them in delivery instead of delivering as single sheets. The Web printing machines can both print one or both sides and are mainly used for News paper printing, high volume printing magazines, Label printing and in Flexographic units where the cartons are printed for packing purposes. The Web machines print much faster than sheet fed presses. 

Read an interesting article on Web Break in the following site :
  
...........Additions to alphabet W to be continued under W/2

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