Duplex printing curling paper

[David Hare-Scott]

I have a Samsung CLX-6220FX multifunction colour laser which is capable of
manual duplex printing. I am using standard 80gsm white A4 paper. In
single-side operation it rarely jams. The duplex printing works tolerably
well except that in some cases the paper curls after the first pass and then
jams on the second pass. The curl is along the long side of the paper, that
is the long sides curl up (or down) towards each other.

Is this tendency to curl inherent in the type of paper? If so how do I
choose paper that doesn't do it?

Is curling caused by mishandling the paper? If so how do I handle it to
prevent the problem?

If it does curl is it possible to uncurl the paper after the first pass in
some way?

The manual gives no clue on this.

David

 

[Bob Eager]

I have a Samsung CLX-6220FX multifunction colour laser which is capable
of manual duplex printing. I am using standard 80gsm white A4 paper.
In single-side operation it rarely jams. The duplex printing works
tolerably well except that in some cases the paper curls after the first
pass and then jams on the second pass. The curl is along the long side
of the paper, that is the long sides curl up (or down) towards each
other.

Is this tendency to curl inherent in the type of paper? If so how do I
choose paper that doesn't do it?

Is curling caused by mishandling the paper? If so how do I handle it to
prevent the problem?

If it does curl is it possible to uncurl the paper after the first pass
in some way?

Is it related to which way up the paper is placed in the printer?

Years ago I was told, by a photocopier trainer (really) that there was a
right and wrong way up. On the paper I come across (several makes) it's
the right way up if you unwrap the pack with the opening uppermost (as
you usually do!). If you hold the paper between finger and thumb (a good
chunk, say 100 or more sheets) halyway along each long side, the ends
flop down of course. They do it more if it's the 'right' way up.

Try and see if there's any consistency between the 'way up' and the jams
etc.

 

[Elmo P. Shagnasty]

Is this tendency to curl inherent in the type of paper? If so how do I
choose paper that doesn't do it?

Start by trying different brands.

Yes, paper is an extremely important component in the color printing
process. It's not just an incidental; it's probably the single most
important component of the entire process.

Start with bad paper, end with bad results--imaging, feeding, etc.

It's like putting Mexican piss-gas into your Ferrari: yeah, the tank
shows full, and the engine (probably) starts, but...

Combined with the paper is the ink coverage. By definition you're
putting more ink on the paper than a b/w printer, and ink quantity can
also affect curl.

Use a paper that's designed for the color digital process, and see what
the results are.

 

[Joel]

I have a Samsung CLX-6220FX multifunction colour laser which is capable of
manual duplex printing. I am using standard 80gsm white A4 paper. In
single-side operation it rarely jams. The duplex printing works tolerably
well except that in some cases the paper curls after the first pass and then
jams on the second pass. The curl is along the long side of the paper, that
is the long sides curl up (or down) towards each other.

Is this tendency to curl inherent in the type of paper? If so how do I
choose paper that doesn't do it?

Is curling caused by mishandling the paper? If so how do I handle it to
prevent the problem?

If it does curl is it possible to uncurl the paper after the first pass in
some way?

The manual gives no clue on this.

David

Mostly because of the HEAT and ROLLER. I would guess if you put the
papers on a flat surface for 1-2 minutes or so then it should straignten out
(just a wild guess)