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what are gripper cracks (usa stamps) ?  
 

 
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Valued Member
United States
50 Posts
Posted 09/13/2017   9:36 pm  Show Profile Bookmark this topic Add StampsInWV3 to your friends list Get a Link to this Message
please show me some gripper cracks examples. Why do they happen ?
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United States
864 Posts
Posted 09/13/2017   10:12 pm  Show Profile Bookmark this reply Add dudley to your friends list  Get a Link to this Reply
See this thread:

http://goscf.com/t/15988
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Pillar Of The Community
United States
5535 Posts
Posted 09/13/2017   10:19 pm  Show Profile Check Petert4522's eBay Listings Bookmark this reply Add Petert4522 to your friends list  Get a Link to this Reply
Gripper cracks happen on coil stamps. Most coil stamps are printed by a press that uses a cylinder with two plates attached to it. The plates are held to the cylinder by means of grippers that hold the plates down at the ends. These plates have small spaces in them that the grippers can hold. Because of the stress that the grippers exert on the plates, cracks can develop where the grippers are located.
In general the "gripper cracks" can occur mainly on the stamps immediately to the left and the right of the joint- or seam line.

Peter
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Edited by Petert4522 - 09/13/2017 10:20 pm
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