Upload
praveen-mds
View
223
Download
0
Embed Size (px)
Citation preview
8/7/2019 Methods of Image Planning & Assembly_1
1/13
METHODS OF IMAGE PLANNING
& ASSEMBLYHand assembly
Negative assembly to Gold rod with plastic interleave
Peelable membrane substrates
Conventional +ve assembly
8/7/2019 Methods of Image Planning & Assembly_1
2/13
HAND ASSEMBLY
Hand assembly is also called as stripping
In olden days the films are obtained from the
camera department and these output films are
assembled according to the size of themachine/substrate in Planning department
There they do all the pre make-ready processes
involved in platemaking with respect to film.
8/7/2019 Methods of Image Planning & Assembly_1
3/13
8/7/2019 Methods of Image Planning & Assembly_1
4/13
STRUCTURE OF AHAND ASSEMBLED FORM
8/7/2019 Methods of Image Planning & Assembly_1
5/13
NEGATIVE FILM ASSEMBLYWITH GOLD
ROD
Golden rod is not a metal rod. It is a kind of
paper.
Golden rod paper is the most popular image
assembly material used for preparing negativeplates
It serves as a mask to protect the nonimage areas
of the press plate
The colour of the paper limits passage of actiniclight (light that exposes a coating or emulsion)
Widely used for single colour and book work
under negative processing. Not suitable for
precise register work.
8/7/2019 Methods of Image Planning & Assembly_1
6/13
PROCESSING WITH GOLDEN ROD PAPER
8/7/2019 Methods of Image Planning & Assembly_1
7/13
PROPERTIES OF GOLDEN ROD PAPER
True golden rod paper is yellow in colour
Many papers called golden rod are orange, serves
better to block actinic light
Red papers are also available and are best forblocking light
Golden rod paper will change size appreciably if
there is more than a 20% change in relative
humidity The thickness can vary from 0.004in0.005in
(~90 gsm)
It can be either single side coated or double side
coated material
8/7/2019 Methods of Image Planning & Assembly_1
8/13
DISADVANTAGES WITH GOLDEN ROD
Due to change in relative humidity the size of the
material gets changed this is the major
disadvantage with Golden rod papers
This thickness variation can cause gap betweenthe film and the press plate during exposure in
the vacuum frame
If a problem develops with gaps around the edges
of the halftone before exposure in a vacuum
frame, contact can often be improved by laying a
sheet of 0.0005in cellophane over the plate before
drawing up vacuum
8/7/2019 Methods of Image Planning & Assembly_1
9/13
PEELABLE MEMBRANE SUBSTRATES
8/7/2019 Methods of Image Planning & Assembly_1
10/13
CONVENTIONAL +VE ASSEMBLY
This process uses reverse principle from negative
assembly with golden rod paper.
Here we use transparent sheets as a supporting
materials for the film Stripping a positive film over a transparent sheet
8/7/2019 Methods of Image Planning & Assembly_1
11/13
WORKING OF +VE FILM
8/7/2019 Methods of Image Planning & Assembly_1
12/13
PLATE EXPOSURE IN APRINTING DOWN
FRAME
8/7/2019 Methods of Image Planning & Assembly_1
13/13
ADVANTAGES
These transparent sheets used for assembly can
be reused
Good stability due to the resistance of the
material These are plastic materials, wont expand much
due to change in relative humidity