Creeping perfect bound books.

[QUALPRINTER]

Hoping to get some opinions on the best way to creep a perfect bound book specifically dealing with image crossovers. We've got a good handle on the calculation, but are now trying to compensate for the bend in the book. So if you were to open a book and force it to be flat on a table the crossovers look great. But most readers would open it and allow the natural bend of the pages. In this way the crossovers seem to be off.

 

[MacTwidget]

Our shop calls this a "visual crossover" situation. If you have a 1/4" hinge score.... On the left-facing page move the image 3/8" to the left. Do the same for the right-facing page moving the image to the right.
The only drawback is that you have to export/print your pages one at a time.

 

[QUALPRINTER]

Mac,
We're doing something similar but only needing to use 1/4, but this would be for Inside Cover and page 1. I'm more interested in compensating for "visual crossovers" on say p25 of an 80 page book.

 

[MacTwidget]

If your are running 16-pg signatures creep is negligible so the same method would apply throughout the book. The reason I use 3/8" instead of 1/4" is to take into account the hinge plus the bend/roll of the page as it is opened. I have found that this works almost perfectly.

 

[naplajoie2000]

Creep is not what we call it. Crossovers are handled individually by subject matter for us. 1/4" hinge score we pull out a standard 1/8" on both left and right hand pages. If the subject is locked (tied to a page element on one of the pages) or would cut off a portion of an image that would be visually a problem, we adjust and may pull one page more and the other less adding up to the 1/4" pull. On IFC/p1 and last page/BC crossovers we pull out 1/4" both ways to clear the hinge score and hold back all inks 3/16" from spine for glue trap. Works for us on most all our perfect bound books, and we do alot of them.

 

[QUALPRINTER]

Crossovers are handled individually by subject matter for us. 1/4" hinge score we pull out a standard 1/8" on both left and right hand pages.

Thanks for the feedback Guys. naplajoie2000 this move looks like it right up our alley. We'll be trying this on the next project!