junker1984
Senior Member
- Joined
- 2010
- Posts
- 1,299
- Geo
- US, Midwest
A "caved" cylinder, as we call it, is simply the damage caused by (a) a group of sheets being pulled through the machine while mainly on impression, if a machine had expectations, it was expecting only the one sheet the squeeze was set for. But, if due to an inoperable barrier asssembly or, say a deactivated double sheet detector, an unexpected group of sheets got pulled in, the hollow, web support of the cylinder surface gets crushed, causing low areas of damage or (b) an object large enough to spread out pressure (like a blanket bar) falls in between cylinders not only causing the image of that object, but also, again, crushing the webbing of the cylinder.