Paper and Board Working properties – the way in which each material behaves or responds to external sources
Flexibility
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Amount material bends when a force is applied (stiffness),determined by its thickness and weight
Flexural stiffness is resistance to an external bending force
Handling stiffness is the ability to support its own weight
Printability
How porous a material is and therefore its ability to accept a printed image onto its surface.
Affected by surface properties, such as smoothness or finish, and structural properties, such as bulk or thickness.
Not the same as print quality, which is determined by other factors such as alignment of plates on the machinery.
Biodegradability
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Ability to be broken down by bacteria or other biological means
Most uncoated paper products are biodegradable because they are made from wood pulp
Compostable means that a material can biodegrade in less than 12 weeks.
Weight
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Surface finish
Papers for printing photographs onto are very smooth and glossy to give a crisp, sharp image.
The smoothness or roughness of the paper or board surface.
Papers with a rough finish include…….. because……
Absorbency
The amount of water absorbed by the surface of paper and boards.
Linked to printability (porosity) and the setting rate of water-based adhesives and inks
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How is paper weight measured??
How is it calculated?
What is the difference between paper and board?