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 ( for my record and correction wherever needed.



- Over 400 terms-

Click on this line to read from 'A'

Thursday, September 20, 2012

Alphabet- K

1. Kiss Impression : A delicate printed impression, just heavy enough to be seen. This term is attributed more while printing thin paper in which the impression from the back side should not be visible on the back side which will tarnish the look on the backside print material. Also in normal paper if a heavy impression is given, the image will slightly appear smudged at the edges. Therefore it is essential that the lightest possible impression that will transfer ink to a substrate should be given. The standard procedure for quality printing by Offset is to set gap between the blanket and impression cylinder in such a manner that the blanket transfer the image just by touching the top layer of the paper, at the same time effecting perfect print image. This is also the case in Letterpress process, where the relief on the blocks, plates or fonts should just touch the paper and not press them too hard to show some amount of embossed image on the backside, especially while printing sensitive carbon less paper stocks. By saying Kiss Impression it is to be understood that the image transfer should be made with ideal impression, neither too hard to smudge or show up the image on back, nor inadequate not to show the image itself. Clean print image created while applying the least amount of pressure possible A harder impression might produce smudged ink around the edges of the printed areas. A lighter amount of pressure would not adequately transfer the image. It is therefore a delicate balance to achieve. A very light printing impression, with just enough pressure to create an image and transfer of ink to the paper,  a term used to signify ideal impression pressure when printing by the letterpress processor when printing pressure sensitive carbon less papers.

2. Kiss Cut: Usually referring to cutting to size or shape of self-adhesive labels. The release liner  backing paper will be the carrier  of the self adhesive labels and till the labels are peeled off from the release liner backing paper, they will not loose their adhesiveness. Therefore the adhesive labels attached to the release liner backing paper  will be either printed to particular design or remain non printed and cut to different shapes or sizes meant for actual use. Since the adhesive paper can not be removed from the release liner  backing paper and then cut to size or printed with some matter, the pre printing or pre cut to specific shape should be done only when they still remain on release liner backing paper to enable the self-adhesive label to be peeled away leaving the base sheet intact whenever needed. The Pre cut shape/ size is effected with specially prepared cutting dies in such a manner that the adhesive label alone is cut leaving the release liner  backing  paper unaffected. This is called the Kiss cut. 

3. Key line: The thin lines that are drawn in an artwork or design to indicate the correct size, shape for placement of deign elements including images and text matter on to the layout. In simple word it is a guide plate for the layout artists for final positioning of the texts and images in correct position and contain thin line in blue indicating positions as stated. 

4. Kraft Paper : A tough and strong paper used for packing purposes. They are also used as wrapping paper, carry bags, sack bags, and large envelopes. This paper is made of both bleached or unbleached and with long-fiber. They are produced with smooth base on one side, while the other side will be multiple ribbing for handling without slipping. Since they are made of wood pulp, they come in different brownish shade only. Of late the Kraft papers are also supplied laminated or varnish coated on one side to add strength to the paper.
5. Kaolin : A white colored mineral substance also called clay is used as an additive and filler and added along with the pulp during manufacturing of the paper.
6. Kerning : The narrowing of space between two characters so that they remain closer and take less space on the page. Some times closing the space also makes their appearance better. However note that the kerning is not possible on the manually composed typographic metal fonts or photo mechanical processes like Lino and Mono Types, and will be possible only on image setters and computer aided type setting processes.  By kerning the space between characters can be either increased or decreased.

7. Key Plate : The black printing plate that is used as a guide for the other plates in the color printing process as it usually has the most detail of the print matter. All other plates are aligned to this plate.
8. K & N ink receptivity: This is related to the testing of the paper meant for printing. The K & N factor indicates the oil absorbency of the paper or penetration test. By this test, a special white pigment non drying colored oil or ink called K & N ink is smeared on the surface of the paper and allowed to remain on the surface for a specified time, and under specified conditions. Thereafter the ink is wiped out of the surface of the paper with cellulose wading ( cotton like substance) and the different degrees of color depth of the ink stains as absorbed into the paper is measured by a special instrument.
9. Kelvin temperature: The temperature of the light rays are measured for short listing the suitable light source and their usage for colour separation. The color temperature of a light source is the temperature of an ideal black that radiates light of comparable hue to that of the light source. Generally the Kelvin temperature are found indicated on the light sources procured. The factor is indicated as Ko. The bright sunshine measures 5000 Ko which is rated as cool color. Xenon lamps have more than 6500 Kelvin temperature, Arc lamps up to 5000 K, and color photographic Tungsten lamps some thing around 3500 which is thus form the order of preferred lamp sources by the process dept. Low colour temperature implies warmer colors which is towards yellowish shade. Since the UV light is the best required light for photographic purposes, the process department prefers only cooler colour temp lights which is bend towards Bluish shade. 
10. Knock out: When some text matter or an art with lines, large dots, circles, boxes etc is to be printed over a colored background, the best way to produce the desired color is to first reverse the area or mask ( make as non print area) the area where such insertions will be needed and then print in the said blank areas the matter in desired color and desired shade. The process is referred to as knocking out. This can be explained as process of masking or knocking out background colours out an image or shape or object and then print them. 

............Additions to alphabet K to be continued under K/2

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