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Why Do Plate Blocks Like To Curl Up ??

 
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Pillar Of The Community
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Posted 06/27/2016   3:44 pm  Show Profile Bookmark this topic Add jim6092252 to your friends list Get a Link to this Message
I buy albums of plate blocks and even though they have been flat in there all this time when you pull them out they like to curl up. Anything I can do to stop this?
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Posted 06/27/2016   4:27 pm  Show Profile Bookmark this reply Add Petert4522 to your friends list  Get a Link to this Reply
I have the same or similar problem with some plate number coil strips. I put mine in mounts, but with some that still don't work all the time. I do think that part of the problem could be high humidity.

Peter
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4052 Posts
Posted 06/27/2016   5:10 pm  Show Profile Bookmark this reply Add ikeyPikey to your friends list  Get a Link to this Reply
Agreed.

Exposure to humidity.

The gum expands more than the paper, so presto-curlo.

Mounts will hold them flat, but my SWAG (silly wild-assed guess) is that the tendency to curl will always be there, so the possibility of adhesion (to the mount) will always be there, too ... rather like the difference between the albums being kept straight-up or laid-down.

I am not sure that drying (whatever that would mean) would even help - the changes in the gum might not be reversible - but a couple of weeks in a drying book could not hurt.

Cheers,

/s/ ikeyPikey
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Posted 06/28/2016   8:05 pm  Show Profile Bookmark this reply Add sdtom to your friends list  Get a Link to this Reply
I had the same thing happen to me.
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Posted 06/30/2016   2:22 pm  Show Profile Bookmark this reply Add smauggie to your friends list  Get a Link to this Reply
Also, the plates they were printed were not flat most of the time, and I suspect that the printing process may have realigned the paper fibers into more of an arc then flat. Just my SWAG. Love the term, Ikey.
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APS Member #: 222539 AAPE, Maplewood Stamp Club (MN), Northern Philatelic Society, US Philatelic Classics Society, Auxiliary Markings Club, Canal Zone Study Group, Minnesota Postal History Society
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United States
4052 Posts
Posted 06/30/2016   4:28 pm  Show Profile Bookmark this reply Add ikeyPikey to your friends list  Get a Link to this Reply

Quote:
... the plates they were printed were not flat most of the time, and I suspect that the printing process may have realigned the paper fibers into more of an arc then flat ...


I'm thinking that the plates were curved, but the paper path was near-flat.


Quote:
... SWAG. Love the term ...


source: United States Navy. No, I wasn't, but why let a good thing go to waste on the swabbies?

Cheers,

/s/ ikeyPikey
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Pillar Of The Community
3589 Posts
Posted 06/30/2016   5:18 pm  Show Profile Bookmark this reply Add jogil to your friends list  Get a Link to this Reply
Stickney rotary press printed stamps curl more than other stamps because they were made from paper rolls that were wetted and printed on. They were rolled back into rolls after printing, gumming and drying and before perforating in order to season. That is why they have perforator gum breaker lines added to the gum side to try to prevent curling.
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Edited by jogil - 06/30/2016 5:27 pm
Bedrock Of The Community
United States
12128 Posts
Posted 07/01/2016   04:59 am  Show Profile Bookmark this reply Add wt1 to your friends list  Get a Link to this Reply
Another theory about humidity causing stamps to curl. This time from a 1937 newspaper article suggesting the local postal clerk can predict the weather based on whether or not the stamps in his inventory begin to curl up:

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Posted 07/01/2016   5:53 pm  Show Profile Bookmark this reply Add angore to your friends list  Get a Link to this Reply
I would think grain direction would be a variable.
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