This is known as Laminating. The sizes of paper and card commonly used follow the ISO Standard - e. A4, A3 etc plus B4, C5 etc. There is also a North America Standard with sizes including letter, legal, ledger, etc.
The most frequently used paper size is A4. A sheet measures by millimetres 8. Common sizes are:. Almost all paper and board has a natural grain which allows the surface to curve and fold more easily in one direction. During paper and board manufacture, most of the fibres line up in the direction of the machine movement.
This gives paper and board its grain which produces similiar effects to the grain in wood. Wet paper will expand more across this grain than along it. Strips of paper cut along the grain will be stiffest and those cut across will curl more easily. This should be considered when involved in some aspects of paper engineering - e.
Activity: If a square of paper is floated on the top of a dish of water, the edges will curl up such that the axis of curl is parallel to the grain direction. The measurement is known as Grammage gms. Ordinary photocopy paper is usually 80gms and thin card is about microns thick and weighs gms to gsm. This is equivalent to two sheets of ordinary paper and is also known as 2-sheet card.
The strength of paper is not determined by its thickness but by the types of fibre and additives used in its production. The difference in paperboard and cardboard cartons lies in how they are constructed. Paperboard is thicker than average paper, but it is still just one layer. Cardboard is three layers of heavy paper, two flat with a wavy one in the middle. Because they have different layers of paper and different weights, these two products cannot be recycled together or in the same way.
While both paperboard and cardboard cartons are recyclable, it is often easier to recycle cardboard. Most communities have recycle programs for cardboard, glass, plastics, and other items.
However, paper recycling and paperboard recycling centers can be difficult for your customers to find. I found both snippets seem to do the same thing. So when to use which? Many thanks. Improve this question. Add a comment. Active Oldest Votes. Improve this answer. Jeremy Odekirk Jeremy Odekirk 3 3 silver badges 13 13 bronze badges.
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