Re: [Origami] GSM vs LBS and variations. Help!
On Tue, Jan 12, 2016 at 10:55 AM, Anna wrote: > > 2016-01-11 22:26 GMT+01:00 Rob Hudson : > > Can someone explain how lbs associate to gsm?: > > Basically they don't. The gsm are grams per square meter and therefore > give you the density of the paper. > Technically this is not exactly density, but, having units of mass per unit area, is a property called "grammage": https://en.wikipedia.org/wiki/Grammage (Proper density would be mass per unit volume. There is, apparently, something called "area density" which exists for 2-dimensional objects... and paper is thin, but not quite THAT thin...) > The lbs are the pounds per ream. A ream is (most often but not always) > 500 standard-sized sheets, and different types of paper have different > standard sheet sizes. So this measurement unit is nuts, because it > tells you exactly nothing about the paper. This entry at Wikipedia: https://en.wikipedia.org/wiki/Paper#Types.2C_thickness_and_weight has some useful tidbits including reference to the oddness with US paper "weights": "In the United States, the weight assigned to a paper is the weight of a ream, 500 sheets, of varying "basic sizes", before the paper is cut into the size it is sold to end customers." And I have to agree with Anna, this is pretty crazy! I can't quite imagine why anyone let this go on for so long and didn't find a way to standardize. I suspect anyone in the trade just learns what the weights mean for all the different kinds of papers, and that if one needs to be absolutely unambiguous, one talks about grammage! The "Grammage" page goes into some more detail on it, and has a chart with the basis weights of different kinds of US papers, for reference. Anne
Re: [Origami] GSM vs LBS and variations. Help!
2016-01-11 22:26 GMT+01:00 Rob Hudson : > Can someone explain how lbs associate to gsm?: Basically they don't. The gsm are grams per square meter and therefore give you the density of the paper. The lbs are the pounds per ream. A ream is (most often but not always) 500 standard-sized sheets, and different types of paper have different standard sheet sizes. So this measurement unit is nuts, because it tells you exactly nothing about the paper. No idea why it is still used, must have something to do with wrong ideology. On this page you can find a converter that takes the size of the paper into account to convert to gsm: http://www.stillcreekpress.com/paper-weight-conversion-tool/ Nice Greetings Anna from Vienna, Austria
Re: [Origami] GSM vs LBS and variations. Help!
> On Jan 11, 2016, at 3:26 PM, Rob Hudson wrote: > > Can someone explain how lbs associate to gsm?: Personally I like to use 24 lb. text weight over 20 lb. especially for modulars. I find the tension is a better with the very slightly thicker 24 lb. I do not fold 60lb. I find that too thick. It is like a light weight cardstock, which I do not find good for origami. They say 60 lb is cover weight. 90 lb is cardstock. Leslie I also found a conversion chart at coastal print.com, though I am not sure if is makes it more confusing or if it is helpful.
Re: [Origami] GSM vs LBS and variations. Help!
In searching online, I find the metric (gsm) notation to be consistent, but I'd like to be able to do a conversion to foldable paper in LBS units. Can someone explain how lbs associate to gsm?: Thanks! Rob Here is a link to a conversion calculator and the related formulas http://okpaper.com/calculators/lbs-to-gsm OriFUN to all Dianne
[Origami] GSM vs LBS and variations. Help!
Hi all, I've been trying to figure how thick paper will be by glancing at the packaging in the store, but it seems like there's a difference (at least as they're expressed in US units, lbs) among brands and types. Some things listed as "65 lbs" seem to be foldable paper; others feel more like card stock. The description on the packaging is generally inconsistent. I find myself sneaking the shrink wrap off to feel the paper. In searching online, I find the metric (gsm) notation to be consistent, but I'd like to be able to do a conversion to foldable paper in LBS units. Can someone explain how lbs associate to gsm?: Thanks! Rob