COMPARISON   OF  DIE  CUT  DIFFERENCES

These are examples from stamps printed by Avery Dennison
 
Peak-compare.jpg (8270 bytes) Valley-compare.jpg (8321 bytes)  

Note the half-height die cut at the top and bottom of each stamp. This indicates where the coils are supposed to be sliced and will form a 90 degree angle with the top or bottom edge when cut properly.

The examples to the left are fairly easy to tell.  The examples below are not as easy.
Peak / Valley Valley / Peak
The scan below is provided by Mike Lipson and shows the difficulty in determining P/V or V/P die cuts.
The upper left scan has the half-height die cut only at the top of the stamp and the first occurrence below that is a peak, which would make this a Peak/Valley.  It appears that the stamp above it would have been just the opposite, a Valley/Peak. The lower left scan also is a Peak/Valley because the top half-height die cut has a Peak immediately below it.  The bottom die cut looks like it probably is half-height but there is not enough showing to be sure. PV-VP WashingtonCombo.jpg (45571 bytes) The upper right scan, a Valley/Peak, has a half-height die cut on the bottom, with a Peak immediately above it.  The top die cut appears to be half-height but there is not enough showing to be sure. The bottom right scan, also a Valley/Peak, has a half-height die cut on the top with a Valley right below it and a full Peak at the bottom.

 

BisonDieCut.jpg (33980 bytes)
This scan shows a miscut Bison strip with the half-height die cut plainly seen on the top at left and right.  The strip would be Peak/Valley (P/V) because the first die cut on the left below the half-height die cut is a peak.
 

Determining if a coil is P/V or V/P depends on the position of the full die cuts next to where the half-height die cut is, either on the top and/or bottom of the stamp.  In an ideal situation the slicing roller would cut the half-height die cut exactly in the center, and the slicing rollers would be equal distance apart.  In many cases, as illustrated above, there are examples of less than perfect slicing which leave little of the half-height die cut visible.

Please see Alan Thomson's extensive illustrated articles in the May 2001 Coil Line and the June 2001 U.S. Specialist for more information.  Click here for Alan's Coil Line article in Adobe Acrobat format.

 

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