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Categories: Book printing >> Support Center
Terminology of Paperboard in Book Printing
Origin:Image Printing  Data: 3/5/2011  Keywords: Paperboard in Book Printing

When we design a cover for a printed books, how can we choose the paper or paperboard? Sometimes, we might be confused, especially during cross-culture negotiating and communicating. Here we would like to introduce some terminology, and try to clarify the confusions.

The line of demarcation between paper and paperboard is rather loose. ISO define paper with above 250gsm, or simply as board. However, in some parts of the world the dividing line is placed at 300gsm. There are many anomalies, e.g. blotting papers are often heavier than 300gsm and fluting medium and some liner boards used for corrugated are less than 250gsm. Except for this distinguish, below terms should be listed out the definition.

Backs: The ply that forms the under surface of the sheet.
Caliper: Also called substance, usually measured either in mils or microns.
Furnish: The fiber composition of a paper or board sheet, usually given in percentages.
Grammage: The mass per unit area of the board in gsm.
Liner: The ply that forms the top surface of the sheet, usually a good quality printable layer.
Machine direction (MD) and cross direction (CD): Sometimes called grain and cross grain. The MD is the direction along the sheet as it emerges from the board-making machine and the CD is at right angles to the MD.
Middles: Plies in the middle of the board, frequently of secondary fibers or mechanical pulps.
Ply: One of several layers of fiber that make up a multi-ply board.
Sheet size: The width of a sheet is given first. This is the dimension measured in the CD. For example, 500mm x 750mm means 500mm in the CD and 750mm in the MD.
Underliner: A ply of lower quality than the top surface between the liner and the middles, usually to prevent the grey/brown color of the middles showing through the top liner.

Paperboard can be used as body materials of case for wrapping paper outside, or it can be used to make folding box.

Paperboard used for case in Book Printing JobsPaperboard for Folding box printing

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As a professional book printing factory in China, Image Printing Packaging Ltd focus on book printing and packaging printing mainly for oversea and domestic customers. We are located in Shenzhen city, the book printing and packaging printing industrial center of China and even worldwide. Please be kindly note we offer a wide range of professional customed printing service with aggressive prices
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