Piedmont 150 plate scratch(es) progress

[Luke]

I'd love to see this have its own thread.

Doesn't really seem possible logically (imo) that the Print Scratches could be "gear streaks". The scratches sometimes stretch the length of the sheet diagonally, and they make abrupt changes of direction. Definitely interested to hear more about the gear streaks, but unless I'm not fully understanding the term, I don't think that's what we are looking at here.

[SetBuilder]

Originally Posted by Luke

I'd love to see this have its own thread.

Doesn't really seem possible logically (imo) that the Print Scratches could be "gear streaks". The scratches sometimes stretch the length of the sheet diagonally, and they make abrupt changes of direction. Definitely interested to hear more about the gear streaks, but unless I'm not fully understanding the term, I don't think that's what we are looking at here.

The streaks go diagonally in a straight line. Something that would happen when you have paper between two spinning cylinders, and one cylinder is spinning faster than the other with pressure on one side.

A helix of ink around a cylinder is created - like a spinning barber shop pole.



If the stripes were ink, they would produce diagonal lines on a piece of paper.

[Luke]

I'm not trying to be argumentative, just interested in the idea and would like to understand it better. Here are the two main reasons why I don't think we are looking at "gear streaks"

1. The lines are definitely not "straight". They follow a general direction but are not a straight line.

2. The Plate Scratches follow the exact same pattern every time. For two of the Plate Scratch patterns, there are two different sheets with the exact same pattern on the back, but a completely different set of fronts. The backs allow us to re-create what the sheet looks like, which Pat has done.

If it was just a random malfunction of the press, I can't imagine that the pattern would be exactly the same every time.

[SetBuilder]

Originally Posted by Luke

I'm not trying to be argumentative, just interested in the idea and would like to understand it better. Here are the two main reasons why I don't think we are looking at "gear streaks"

1. The lines are definitely not "straight". They follow a general direction but are not a straight line.

2. The Plate Scratches follow the exact same pattern every time. For two of the Plate Scratch patterns, there are two different sheets with the exact same pattern on the back, but a completely different set of fronts. The backs allow us to re-create what the sheet looks like, which Pat has done.

If it was just a random malfunction of the press, I can't imagine that the pattern would be exactly the same every time.

Note: I edited my post above to add the barber shop illustration. Apologies if you replied before you saw it.

1. They're straight, but sometimes shaky. I've seen most of the photos posted on this thread and the shaky lines could possibly be due to vibration. They're definitely straight lines more often than not.

2. Do you mean that the lines appear on the backs only and not on the front? I think this is because the last stop (or first) on the press was the printing plate for the back design.

[Luke]

No. The term "gear streaks" sounds like they are random streaks on a sheet.

The Plate Scratches are a pattern that was repeated over and over on each sheet.

Pat has stacks of the same player with the same exact Plate Scratch on the back.

[SetBuilder]

Originally Posted by Luke

No. The term "gear streaks" sounds like they are random streaks on a sheet.

The Plate Scratches are a pattern that was repeated over and over on each sheet.

Pat has stacks of the same player with the same exact Plate Scratch on the back.

Well, I think it's more explanatory than "plate scratch," since the printing plates were relief and not intaglio. A scratch on a relief plate would be void of ink.

[Pat R]

Hi Manny,

The gear streak information is interesting thanks for posting about them.

I agree with Steve and Luke I don't think that's what caused the
plate scratch marks. From what I understand the gear streaks
wouldn't be repetitive and the plate scratches are. As Luke pointed
out the same exact scratch can be found on the same subject multiple
times and on some sheets they same exact scratch can be found on
two different subjects.

Konetchy Group.jpg
Konetchy Group Front.jpg

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Doyle-Stone Front.jpg