HP color laserjet 4500 Manuale Utente
EN
Potential toner cartridge issues 105
6
Toner cracking
When the paper is folded and the crease aligns with a line of text, it is
possible with certain types of paper for the text to break along the line,
giving the appearance of a white line through the text. Papers that do
not meet the smoothness (100-250 Sheffield, 100-500 Bendtsen) or
wax pick (>11 Dennison) are likely to exhibit this effect more than
others.
possible with certain types of paper for the text to break along the line,
giving the appearance of a white line through the text. Papers that do
not meet the smoothness (100-250 Sheffield, 100-500 Bendtsen) or
wax pick (>11 Dennison) are likely to exhibit this effect more than
others.
Toner in the HP LaserJet printers is composed of minute particles of
pigmented plastic material (styrene) and iron oxide. When the toner is
subjected to the fusing temperature, these individual iron-impregnated
plastic particles become part of a larger plastic image on the page.
When the printed page is subsequently folded, the plastic image must
also give, in some fashion, to accommodate the fold. If the print image
has been well-set into the paper, this resulting break in the plastic will
not be apparent. However, if the toner is unable to adequately penetrate
the paper fibers or if, in the process of folding the paper, the paper
fibers behind the toner break away from the page itself, the result will be
a “white line” through the image. There are several ways to minimize
this effect:
pigmented plastic material (styrene) and iron oxide. When the toner is
subjected to the fusing temperature, these individual iron-impregnated
plastic particles become part of a larger plastic image on the page.
When the printed page is subsequently folded, the plastic image must
also give, in some fashion, to accommodate the fold. If the print image
has been well-set into the paper, this resulting break in the plastic will
not be apparent. However, if the toner is unable to adequately penetrate
the paper fibers or if, in the process of folding the paper, the paper
fibers behind the toner break away from the page itself, the result will be
a “white line” through the image. There are several ways to minimize
this effect:
•
Ensure that the paper being used meets all of the specifications
provided in the HP LaserJet Printer Family Print Media Guide; in
particular the smoothness and wax pick.
provided in the HP LaserJet Printer Family Print Media Guide; in
particular the smoothness and wax pick.
•
For the reasons listed earlier, a narrower character-stroke width
might also help.
might also help.
In electrophotographic (laser) printing, using paper that has a laid finish
often causes problems. The surface roughness of the paper is often
responsible for the problems.
often causes problems. The surface roughness of the paper is often
responsible for the problems.
Paper that is stiffer than electrophotographic paper also causes
problems. Stiff papers do not fold well. When stiff paper is folded and a
toner image is applied to the paper’s surface, the problems are even
worse.
problems. Stiff papers do not fold well. When stiff paper is folded and a
toner image is applied to the paper’s surface, the problems are even
worse.