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48 Print media specifications
Surface roughness
Surface roughness of papers can affect print quality, feeding, and
fusing (toner adhesion). If paper is very smooth, background particles
are more easily seen and sheets tend to stick together and create
multiple feeds. Very rough papers can degrade transfer of toner onto
the page, causing jagged edges or toner scatter. Fusing (toner
adhesion) can also be drastically reduced on very rough papers.
Roughness is usually measured using an air leak method such as the
Sheffield method. Typical Sheffield values for different paper surfaces
are:
l around 120 to 150 for xerographic grades (wove or regular
finishes)
l around 40 to 60 for very smooth laser or coated grades
l around 250 to 300 for cockle finishes
l greater than 350 for traditional linen and laid finishes
Composition (furnish)
Composition (furnish) is the mixture of various materials, such as
fiber, filler, sizing materials, and other additives, used to make the
paper stock. Fillers such as calcium carbonate, clay, or talc are
added to paper to fill in the spaces between fibers.
For optimum performance of your HP LaserJet printer, use paper
made from 100% chemical wood pulp and/or cotton fiber. Recycled
paper, made with no more than 5% groundwood, is also acceptable.
To ensure that paper of a special fiber composition will work correctly
in your printer, test it before purchasing large quantities.
Note Avoid using print media containing materials that melt, vaporize, offset,
discolor, or release undesirable emissions when exposed to 205° C
(401° F) for 0.1 second (0.2 second for HP Color LaserJet printers).
Curl
Curl is curvature or wave in a sheet of paper before or after printing.
Sheets might curl before printing if they are exposed to humid
conditions or very dry conditions. Residual stresses in the sheet or
high moisture content can also affect the level of curl after printing.
Good process control by the paper manufacturer and proper paper
storage and handling will minimize curl problems.