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In article <1992Sep28.130819.8722@unlinfo.unl.edu> jaffe@hoss.unl.edu
(David Jaffe) writes: 

> [printing the same sheet of paper twice crinkles it]

This is because of the high temperatures in the laser printer driving
off moisture from the paper. Ask your paper supplier for some paper
with a higher moisture content. Also you could have a service engineer
check your printer; the heater (used to fuse toner to the paper) might
be set too high.

--
Chris Lilley
---------------------------------------------------------------------------
Technical Author, ITTI Computer Graphics and Visualisation Training Project
Computer Graphics Unit, Manchester Computing Centre, Manchester, UK
Internet:   lilley@cgu.mcc.ac.uk        Janet:   lilley@uk.ac.mcc.cgu
Voice:      +44 (0)61 275 6095          Fax:     +44 (0)61 275 6040
---------------------------------------------------------------------------

[]

	"I can print double-sided by first printing the odd pages, then
	putting the output back into the input tray, and printing the
	even pages.  But when I do this I get a very high percentage of
	crinkled pages.  What can I do to avoid this?"

Wait an hour before printing the even pages, and flip through the pages
(expose them to air) a few times while you wait.  The first pass heats
the paper and drives out the moisture.

  -=- Andrew Klossner  (andrew@frip.wv.tek.com)
                       (uunet!tektronix!frip.WV.TEK!andrew)

In article <1992Sep28.130819.8722@unlinfo.unl.edu> jaffe@hoss.unl.edu (David Jaffe) writes:
<I have a postscript laser printer (TI Microlaser Plus).  I can print
<double-sided by first printing the odd pages, then putting the output back into
<the input tray, and printing the even pages.  But when I do this I get a very
<high percentage of crinkled pages.  (The first time through, the output is 
<fine.  But the second time through, crinkling occurs.)  What can I do to avoid
<this?  The only thing I can think of is to use a different kind of paper.

You are a victim of the paper curl on the first pass.  I too have the problem
with the Apple LaserWriter IINT.  The cure is to run it through backwards.
(Tail first)  OK, so you can't do it normally.  So, to get the curl fixed,
run the paper through the printer upside-down, backwards, printing blank
pages.  This can be done by telling to printer to print x number of blank
pages.  Then you can print the other side of the paper, since the bad curl
will have been straightened out.

With groff output, I can print the output upside down, removing the blank pass.
-- 
      harvard\                          spool.cs.wisc.edu!astroatc!vidiot!brown
Vidiot  ucbvax!uwvax..........!astroatc!vidiot!brown
      rutgers/            INTERNET:vidiot!brown%astroatc.UUCP@spool.cs.wisc.edu
                                   brown@wi.extrel.com

jaffe@hoss.unl.edu (David Jaffe @ University of Nebraska - Lincoln) once wrote....
>I have a postscript laser printer (TI Microlaser Plus).  I can print
>double-sided by first printing the odd pages, then putting the output back into
>the input tray, and printing the even pages.  But when I do this I get a very
>high percentage of crinkled pages.  (The first time through, the output is 
>fine.  But the second time through, crinkling occurs.)  What can I do to avoid
>this?  The only thing I can think of is to use a different kind of paper.
>What kind is best for this purpose?

This is often caused by damp paper.  Keep the paper in it's original 
wrapping, and in a "heated" cupboard.  Just putting an ordinary light
bulb in the cupboard is enough to keep things dry.

>
>David Jaffe (jaffe@hoss.unl.edu)
>University of Nebraska - Lincoln

----
Graeme Hart                                     Telephone:  64 4 3829124  
graeme@hart.actrix.gen.nz                       Snail Mail: PO Box 11865    
                                                            Wellington       
                                                            New Zealand

In article <1860@shaman.wv.tek.com> andrew@frip.wv.tek.com writes:
<[]
<
<	"I can print double-sided by first printing the odd pages, then
<	putting the output back into the input tray, and printing the
<	even pages.  But when I do this I get a very high percentage of
<	crinkled pages.  What can I do to avoid this?"
<
<Wait an hour before printing the even pages, and flip through the pages
<(expose them to air) a few times while you wait.  The first pass heats
<the paper and drives out the moisture.

Doesn't work too well with my LaserWriter IINT.  The main problem is the
wait...an hour?  Can't get much work done waiting an hour.  The second
problem is that the curl that was created in the paper tends to stay.

But, I have created a method of working around the problem and I haven't
had a crinkle yet.  I've had the stupid printer pull in more sheets than
it should, but never a crinkle.

My cure takes on two forms.  One depends on the document being formatted
with groff (a troff source), the other works with non-groff PostScript.
All of these methods work with the Chris Lewis psxlate program (part of
his psroff suite of programs).

Here are the scripts that I use for groff PostScript:

program name: printthem
***** CUT HERE *****
#! /bin/csh
if ( $#argv == 0) then
	echo "No file name given, please re-enter command with file to print."
	exit
endif
echo -n "Number of "
grep Pages: $argv[1]
psxlate -2rB < $argv[1] | lp
echo " "
echo "Press return when paper placed into tray for second side."
set a=($<)
upsxlate -2B < $argv[1] | lp
***** CUT HERE *****

program name: upsxlate
***** CUT HERE *****
#!/bin/csh
sed -e "/1 -1 scale/s/scale/scale 612 PL translate 180 rotate/" | psxlate $*
***** CUT HERE *****

Here is what happens with the scripts.  It is real simple.  The first half,
the even half, are printed first.  The paper prints in the top tray, face
down.  After printing, the paper is lifted from the top tray and dropped
into the feeder tray.  No turning on any axis.  Then the odd pages are
printed...feet first...again in the top output tray.  The result is double-
sided output in order.

The key is the printing of the second side, feet first.  By printing upside-
down, the curled side isn't fed into the tray.  The side that comes out last
isn't curled.  So, I print in the opposite direction.  Obviously this only
works with groff output.  But, if you are always using the same package,
you should be able to find the right section of the PostScript output and
change the code to be able to flip it around.

Now, if you can't print in reverse, the other trick is to shove the paper
through, feet first...printing blank sheets to fix the curl.  Then you can
print the other half, top first.  Here is the simple script for that:

***** CUT HERE *****
#!/bin/csh -f
cat > blank.page.ps << EOF
%!
save
/#copies $1 def
showpage
restore
EOF
lp blank.page.ps
***** CUT HERE *****

I call the program "blank.page" and on the command line the number of pages
that need to be sent through the printer is added, like:

	blank.page 5

After doing the above, the curl is removed from the leading edge, which was
the trailing edge when sent through blank.

I know that this eats up printer mechanical time, so that I why I looked
into printing the second side right away, upside down.

I hope this helps, at least one other person.
-- 
      harvard\                          spool.cs.wisc.edu!astroatc!vidiot!brown
Vidiot  ucbvax!uwvax..........!astroatc!vidiot!brown
      rutgers/            INTERNET:vidiot!brown%astroatc.UUCP@spool.cs.wisc.edu
                                   brown@wi.extrel.com