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Old 07-18-2006, 12:17 PM   #1
PeterArnel
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Default 170 gsm

can any one convert this into American speak for me. I have an American client who needs to know what weight of art paper this is
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Old 07-18-2006, 01:11 PM   #2
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Quote:
Originally Posted by PeterArnel
can any one convert this into American speak for me. I have an American client who needs to know what weight of art paper this is
This site gets pretty technical (it actually explains how the calculations are made). But I believe it shows cover stock with a basis weight of 63 as being equivalent to 170 gsm. (Cover stock is probably close to art paper.)

The problem is that the area changes by stock type here — that is, a mill sheet of cover stock is usually 20 X 26 inches; of book stock, 25 X 38 inches; bond, 17 X 22 inches; and sheet newsprint, 24 X 36 inches. That is the source of basis weight.

You guys have it easy, with every weight expressed per square meter!


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Old 07-18-2006, 01:28 PM   #3
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hey
I remember large post (21 x (???) 21ibs - 85gsm
I am not that much older
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Old 07-21-2006, 01:01 PM   #4
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mmmmmmmmmm
Thats not right its the weight of a sheet 1000m x 1000m - thats what the M2 means
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Old 07-21-2006, 02:23 PM   #5
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Peter:

it's the weight of a sheet 1000 m x 1000 m

That's not right either: although the area of a sheet of A0 is 1 m^2, the ratio of the height to the width has to be 2^1/2. The solution to the problem is a height of (2^1/4) m and a width 1/(2^1/4) m, so their product is 1 m^2.

   
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Old 07-21-2006, 02:43 PM   #6
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Michael
Sorry I need to concentrate 1000 sheets SRA2 (450 x 640mm) 100 gsm = 28.8 kg/s
the formula is 450/1000 x 640/1000 *100 = 28.8
100 gsm is the weight in grammes of a piece of paper that is 1m x 1m
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Old 07-21-2006, 03:23 PM   #7
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Peter:

This is a quote from the guide to ISO paper sizes (you probably know it).

'The ISO RA0 format has an area of 1.05 m² and the ISO SRA0 format has an area of 1.15 m²'

SRA2 has the same relation to SRA0 as A2 has to A0 (1/4); so if your paper has a basis mass of 100 g/m^2, 1000 sheets of SRA2 paper (mass of one sheet 1.15*100/4 g) must be approx. 115/4 kg. (The 'approx.' is because the size of untrimmed sheets is rounded to centimetres, not millimetres.) I make 115/4 = 28.75. Excellent agreement!

   
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Old 07-22-2006, 12:21 AM   #8
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OK Michael
BUT it standards for grammes per square meter gm2 or gsm -
so on a day to day basis you can calculate the cost of a1000 sheets of SRA2 paper
450/1000 X 640/1000 x 100 = 28.8kg @ £500 a metre tonne = £14.4 all i need to do is remember the tonne rate of paper which in the UK on arts is about £700 per tonne for 115 - 190 gsm £710 for under 115 gsm and £730 for 200 gsm (board wights) and above
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Old 07-22-2006, 07:42 AM   #9
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Peter:

which in the UK on arts is about £700 per tonne for 115 - 190 gsm £710 for under 115 gsm and £730 for 200 gsm (board wights) and above

It seems rather curious that the price is slightly higher for 200 g/m^2 and above; the higher charge for thinner paper I can understand. Incidentally, years ago, 200 g/m^2 was the borderline for board in the UK, but 250 g/m^2 elsewhere.

I've been meaning to ask why you seem always to use SRA sizes rather than RA; you must have a good reason, because you're adding about 9% to your paper costs.

   
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Old 07-22-2006, 09:30 AM   #10
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Michael
I am about to review the sizes = but RA sizes dioesnt allow for bleed
ie Grip 10 bleed 3 job 210 bleed 3 blled 3 job 210 colour bars 10 edge 10 =450 ish RA2 430
The reason that 200 is higher - I need some notice of this
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