Reference Book
screen to the film support. When the emulsion is dry, the backing sheet of the
stencil is removed and normal direct exposure technique is carried out.Automation in screen printing
The basic problem with any hand operated hinged frame screen printing system
is the small number of impressions that can be made per hour. Production is
limited by how rapidly the printer can feed the stock, close the frame, position
the squegee, pull the impression, remove the squegee and deliver the stock.
The development of high speed screen printing presses such as lever action
hand-operated, semiautomatic and automatic units has made the screen printing
process more easy and popular.Special screen printing applications
Cylindrical screens:-They are used to print on long roll materials such as wall
paper or bolt fabrics which require continuously repeating images.
Screen printing on cylindrical surfaces:- It is used to screen print on lables
directly on cylindrical or conical containers such as bottles, cans, and drinking
cups.
Carousal units:- It is a popular method of screening multi colour images on
materials such as T-shirts. It is a wet-on-wet printing method on which printing
of one colour is done directly over anotherwithout waiting the ink to dry.
Practical Activities- Stencil preparation using different photographic methods.
- Prepare an invitation card using screen printing technique.
- Identify basic shapes of squeegee blades available in your lab.
- Identify the chemicals used in screen printing.
Assessment activities - Assignment on latest developments in screen printing.
- Project work - single colour and two colour screen printing on various
substrates.
TE Questions - What is the basic concept of screen printing?
- What are the three type of stencil preparation method?
- What is the primary advantage of photographic stencil?
- What does the term wet on wet printing means?
- What are the major types of fabrics used for stencil preparation in screen
printing process?