Digital BW, The Print

Is there a mathematical relationship between a paper's Weight, expressed in GSM (grams per square meter?) and Thickness, expressed in Mil?

http://www.paper-paper.com/weight.html

Mark
http://www.stillrivereditions.com

On Jan 7, 2010, at 9:11 AM, Havanai wrote:

> Is there a mathematical relationship between a paper's Weight,  
> expressed in GSM (grams per square meter?) and Thickness, expressed  
> in Mil?
>

>>Is there a mathematical relationship between a paper's Weight,  
expressed in GSM (grams per square meter?) and Thickness, expressed in  
Mil?

That would require that all papers have the same density. Since they  
do not, there is no simple conversion factor.

C. D. Tobie
Global Product Technology Mngr.
Digital Imaging & Home Theater
Datacolor.com
CDTobie@...

On Jan 7, 2010, at 6:11 AM, "Havanai" <k.kramer@...> wrote:

> Is there a mathematical relationship between a paper's Weight,  
> expressed in GSM (grams per square meter?) and Thickness, expressed  
> in Mil?


[Non-text portions of this message have been removed]

Hi Havanai:

Weight and thickness are two separate items. Think about a piece of  
foam vs. a piece of steel-they can be the same thickness but a very  
different weight. Some papers are more dense than others. You can get  
a sense of the mil vs. gsm by checking the specs of a few papers that  
you are familiar with.

For example, many semi-gloss papers are similar to Epson's Ultra  
Premium Photo Paper Luster, and a search on Amazon.com will lead to  
these specs:
# 240 g/m2 weight
# 10 mil thickness, 97% opacity

Atlex.com has gsm and thickness listings on many of its papers.

You can convert mm (millimeters) to mil since those are both thickness  
units. 1 mil is 1/1000 of an inch, and 1 mil = 0.0254 millimeters.

Hope that helps.

All the best,

Andrew
---------------------------------------------------
Andrew Darlow
Editor, The Imaging Buffet
http://www.imagingbuffet.com
Author, 301 Inkjet Tips and Techniques:
An Essential Printing Resource for Photographers - http://www.inkjettips.com


On Jan 7, 2010, at 9:11 AM, Havanai wrote:

> Is there a mathematical relationship between a paper's Weight,  
> expressed in GSM (grams per square meter?) and Thickness, expressed  
> in Mil?
>
>
> __._,





[Non-text portions of this message have been removed]

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Cdtobie <CDTobie@...> wrote:
 
> That would require that all papers have the same density. Since they  
> do not, there is no simple conversion factor.

Just to make things even more interesting, there is a 3rd independent attribute that affects our paper experience (printer feeding, curl control, etc), and that is stiffness.

For example, Generations Alise Natural is much stiffer than the slightly heavier and thicker Velvet Fine Art:

 VFA  260 gsm, 19 mil 
 GAN  250 gsm, 16 mil


Regards,
Clayton


Info on black and white digital printing at    
http://www.cjcom.net/digiprnarts.htm
I-Trak 2.1   http://www.cjcom.net/itrak.htm