Diamond Stars Print defect questions

[brianp-beme]

I know absolutely zilch about the printing process, but I have also have seen/own Diamond Stars with similiar horizontal print lines that come from the semi-high numbers (#85-96). I haven't noticed (and haven't really been looking) for examples in the lower numbers, but if RGold's theory is correct, then it is possible that the following #'s could have print lines, as they all exist in the 1936 print run:

2,4,5,8,9,10,12,16,22,26,30,31, and 73-108

Brian

[steve B]

The presses have guides to help the paper guide evenly into the outfeed stack. The ones above the paper rather than to the sides are either metal bars, or a set of rollers depending on the press. Usually the metal guides are used slowly and never touch the paper, But at higher speeds -More sheets /hour - They might. The wheel kind touches more often, and if the little wheels don't turn well they'll leave drag marks.

A bit of debris at the right spot will also leave drag marks.


And on the infeed side there's often some anti-static material. Usually copper foil sort of spun into a string with bits that stick out. If the sheets aren't actually dry when run through those can also leave drag marks.

There can be more or less anti static material depending on weather.

Typically drag marks will show up across the whole sheet. So for something like cards an entire column would show the marks. The exception would be momentary contact with the outfeed rollers which is usually what looks like a scuffed spot and is usually only in one spot.


Steve B