revcollector..you called it a """double transfer"""...do you mean a ""shifted transfer"" as identified in re-entrys.com..??
Or is that an American/Canadian thing meaning the same thing..??..
SHIFTED TRANSFER Quote:
The basic concept of a shifted transfer involves the plasticity of the soft steel plate under the enormous pressure of the transfer roll in the transfer press. This pressure could range from 8 to 35 tons at the point of contact, depending on the particular press. Under such pressure, the surface of the steel plate actually 'flows' away from the transfer roll in a minute 'wave' as the stamp design is being rocked in. The experience and skill of the siderographer allowed him to apply just the right amount of pressure and at the proper speed in order for this 'wave' to cause a negligible amount of distortion of the plate's surface. The plasticity of the steel at this point usually caused the wave of metal to flatten itself out at the end of each pass of the roll, with no discernible effect on the design. However, despite the skill of the siderographer, sometimes too much pressure was applied too quickly, with the result being a shifted transfer.
Posted 04/23/2015 06:56 am
