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Paper based (compliant) products can be put into three categories.
Paper - Thin, with a weight up to 200GSM
Card - Heavier with a weight over 200GSM
Board - Thickest here and up to 500+ GSM
Paper, card and board are made from wood pulp which is extracted from the fibres found in wood.
Wood is made up of cellulose fibres which are glued together with a natural product called lignin. In order to make paper pulp, the lignin needs to be removed so that the cellulose fibres can bind together to form paper.
The wood is crushed and the extracted material is 95% water based pulp which looks a bit like milk.
It is then passed through dryers and rollers to achieve the basic quality of paper.
STOCK FORMS.
I also want to show you a table of paper sizes.
I also want to show you a table of paper sizes.
Paper and board comes in sizes that correspond to each other called the International Standards Organization (ISO) system.
The thickness of paper and thin card is measured in microns: a micron is 1/1000th of a millimeter.
PROPERTIES.
As all paper products are made from the same material, what makes them different are their optical and surface properties as well as their weight.
Cellulose is ‘jelly-like’ with translucent (transparent at all) qualities which, when compressed lightly, makes paper that can allow light to pass through it.
Layout paper and tracing paper are examples of this.
To make paper more opaque, the pulp is compressed further making it less translucent, and adding thickness makes it more opaque. Paper can be coloured or have additional layers of materials added to it
color and glossy.
possibility to "see througth" the paper.
smoothes refer. (rough)
strengh and durability are depend on thickness and moisture.
tensile strength (for card).
porosity (how may moisture can take inside).
CHANGING THE FINISH.
coating.
sizing.
laminating.
KEY CONCEPTS.
Cost - Basically people choose paper based on cost which is why newsprint for newspapers is so cheap, but photo paper is expensive.
Finish - This is how the material looks and feels and varies depending on what you are using it for.
Thickness - How thick the paper is, as it gets thicker it becomes card then board.
Strength - How strong the paper is. Newsprint is cheap and doesn’t need to last long but packaging for expensive perfume needs to be much stronger.
Brightness - Basically how white the paper is and, as it reflects light, it will appear brighter.
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