Papers and Boards Flashcards
Paper stock forms
range from A0 to A8 each size is half the size of the previous each with the same ratio of size lengths
A-RA (Raw format A)
the paper is slightly larger than its respective ‘A’ size so the excessed can be removed to eliminate any bleeding
Paper thickness
measured in GSM (grams per square inch), thicker paper is harder to fold and score
Compliant materials
materials easily scored, folded and cut into a desired shape with very limited tooling
Paper manufacturing (raw material)
wood is broken down into a grey pulp which is bleached while and dried into the desired shape and thickness
recycling/ landfilling papers and boards
easily reconstituted back into wood pulp to be reused in a different application
all natural source allows it to easily biodegrade in landfill
Die cutting / creasing (process)
steel cutting dies and creasing rules are pressed into the sheet material
dies cut through and rules crease the sheet into the desired shape
ejection pins release the cut net which can be assembled into the final product
bending (paper)
stamped out net is placed on folding table a mechanism folds the paper into the final product
often the cutting dies remain in place to hold the net in place and guide folds the the correct place
laser cutting
a laser is used to cut and engrave the board at high speed often used in the prototyping phase or for small scale production
benefits of laser cutting
faster than traditional methods
high repeated accuracy
high level of detail
design is easily edited
screen printing (advantages and disadvantages)
ADVANTAGES
workshop environment
minimal setup costs
DISADVANTAGES
needs a different screen for each colour
very slow
high unit cost
used only for batch production
Flexographic printing (advantages and disadvantages)
ADVANTAGE
simple
low cost
fast drying water based ink speeds up production
low maintenance
DISADVANTAGE
colours must perfectly line up or the colour blurs
high cost printing plates with large tooling costs so suited for higher volumes
Flexographic printing
four colour CMYK process (cyan, magenta, yellow, key(black)
four colours are printed on top of each other in various quantitates to give the desired colour
rollers cover the plate cylinder with ink which is then pressed onto the paper as it rolls past. the plate cylinder has extrusions and cuts matching where colour should and shouldn’t not be concentrated
used in newspapers, comics, packaging carry bags
offset lithographic printing
ink is rolled onto a plate cylinder with the print built onto it. the plate cylinder prints ink onto the offset cylinder which prints the paper
digital printing
a belt system moves a nozzle back and forth across the page as it is fed through it. the nozzle is controlled by a computer which releases precise amounts of different CMYK colour to create the desired image and colour
