2- Types And Properies Of Paper, Card And Boards Flashcards
Grams per square meter (gsm)
Paper thick ices is measured in gsm, which is weight in grams of a whole square meter of paper.
Microns
Card thickness is measure in microns. A micron is 1/1000th of a millimetre.
What are the main factors taken into account when choosing a paper or board:
Cost Finish Brightness (whiteness) Strength Thickness
What are the three main ways of achieving the different properties of appear and card:
Coating added to the surface. For example, China clay or chalk, which is sprayed on to the surface to give it a smoother finish.
Sizing agent which improves the ability of the paper/card to accept ink by sealing the absorbency of the surface. The coating and sizing applied straight after the brightness of the surface.
Laminating- sticking together layers of thinner card to achieve a board. A whole range of different boards can be made.
Paper is sold by weight up to… when it is called a board.
220 gsm
How many microns are there in a mm?
1000
How many microns is a typical birthday card?
300
Virgin paper
Appear that is just made from wood pulp with no recycled paper added.
What are the advantages and disadvantages of recycling paper?
Advantages:
-kinder to environment. Energy saving due to less raw material being processed. Companies like to be seen as ‘greener’ these days.
Disadvantages:
Harmful chemicals used to the environment (e.g. bleach sometimes used to make paper white). Not as strong as virgin paper. More expensive to make than virgin paper.
What materials can you make paper from?
Wood pulp, corn, straw p, cotton and hemp.
What percentage of all paper does virgin paper make up?
90%
See page 21
See page 21
Finish
Adding a property to a board.
Strength
The resistance to bending or lateral pressure.
Cartonboard
Is a multilayered or laminated material with three or more layers (plies). Usually has a white coating on one or both surfaces to make it easier to print on.
Coatings
Aluminium foil for insulation or as a bacterial barrier for food products.
Plastic for waterproofing.
Greaseproof paper. For example, for baking cups for cupcakes.
Wax coating for waterproofing. For example for a takeaway coffee cup.
Brightness
The level of optical whiteness
How can cartonboard become waterproof?
Combine it with plastics
What are the four basic types of cartonboard?
Solid bleached board
Solid unbleached board
Folding boxboard
And White lined chipboard
Solid bleached board (SBB)
Highest quality white top printable surface
Can be used for perfumes, chocolates, cigarettes
Solid unbleached board (SUB)
Brown, very strong
Can be used for drinks
Folding boxboard (FBB)
White top layer with cream bottom layer
Can be used for toys and games
White lined chipboard (WLC)
Recycled board with a white top surface
Detergent powers
