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Old 05-10-2006, 06:02 AM   #1
ktinkel
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Default Against the grain

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Originally Posted by donmcc
The problem is that there are different basis sizes for printing papers.
All so, which is why I said it was confusing. I use a reference to look up the dimensions, but rely on printers anyway — as there are issues of grain to worry about as well.

   
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Old 05-10-2006, 11:18 AM   #2
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Grain Direction
U have to be very careful - fast running laser have to have long grain paper
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Old 05-10-2006, 01:29 PM   #3
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Quote:
Originally Posted by PeterArnel
Grain Direction
U have to be very careful - fast running laser have to have long grain paper
Not just laser — any printing. I just had the unpleasant experience of reading a book in which the pages had been made the wrong way. The pages kept trying to curl in toward the spine.

Weird and very unpleasant, especially as the text ran too close to the spine, so I really had to work to keep the book open far enough to read.

It was from a no-name publisher, probably someone using a small printer rather than a book printer, but you would think someone along the line would have known how the pages were sitting on the form.

   
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Old 05-10-2006, 01:35 PM   #4
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Kathleen
as a printer its areal problem - regardless on how many pages to view u print the grain direction has to go accross the sheet (long grain) because if the sheet stretches - u can pack underneath the blanket to changed the print length to get fit - if its short grain - it will stretch across the cylinders and u cannot compensate- Grain direction howover is important for covers if they are perfect bound -
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Old 05-10-2006, 02:55 PM   #5
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Peter:

Perhaps these are naive qustions, but in which direction do the majority of fibres lie? I've always assumed that it's in the (paper) machine direction. The second question is how does one establish the machine direction from a piece of cut paper?

   
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Old 05-11-2006, 04:05 AM   #6
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I'm quite sure that grain long is the direction of the paper-making web.

Not sure about your second question, but if it means how do you tell the direction of the grain, there are several ways.

Take a newspaper, or other cheap paper and tear it. One direction tears cleanly, and the other direction tears jagged. The clean tear is on the direction of the grain. This also works on better papers, but is less pronounced.

Or, wet the corner of the paper. It curls with the grain.

Or, fold the paper both ways. It will fold sharper with the same pressure in one direction. That is the direction of the grain.
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Old 05-11-2006, 08:11 AM   #7
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Don:

I'm quite sure that grain long is the direction of the paper-making web

If you are using the 'grain' of paper in the same way as one talks about wood, the fibres lie predominantly in the machine direction (I think). I've seen paper machines in operation, but I never thought to inquire about the preferred orientation of the fibres. I am familiar with tear strengths of paper, which is greatest across the fibres.

   
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Old 05-11-2006, 09:58 AM   #8
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I agree. The process involves wood (or other) pulp travelling in a liquid, and it just makes sense that the fibres would tend to run in the direction the fluid flows.

I guess no one here has ever run a Fourdrinier machine to be able to give a definitive answer.
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Old 05-11-2006, 11:42 AM   #9
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Isnt this agreat site - mmmmmmmmmm
Grain direction
When u buy paper it is always long grain ie on a sheet 450 x 640 the grain goes along the long edge (if you want it short grain then u have to buy it 640 x 900 and cut it in half) - so when the paper is under impression and stretches it will become say 451 x 640 - in the old days when we print one or two colours at a time u would put packing under the blanket to increase the circumfrance and deal with the stretch - with short gain it would stretch accross the cylinder and u have know place to go. These days grain direction matter on anything that goes througth a laser or perfect bound cover where the grain should go down and not across.
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Old 05-12-2006, 08:08 AM   #10
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Quote:
Originally Posted by PeterArnel
When u buy paper it is always long grain
Over here (NA) the merchants will sell paper either grain long or grain short. (On most sizes, possibly on the largest sizes it will only come grain long.)
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