bottling

[sweisens]

We have just gotten a double web press, and are looking to run 64 page sigs on it. The problem is the inner pages twist when folding. we can correct this with the software we have, but we need to get the bottling factor from a ppi. Does anyone have the formula? We run an Esko scope 7 system. Thanks in advance for the help.

 

[rich apollo]

No, but strippers used to fold down a sig and then punch it through with a pin/needle to determine creep. I reckon the same thing would work for bottling.

 

[sweisens]

Thanks Rich, we will look into this option.

 

[DavidMa]

When we run a double in-feed 32 pager, we will get a folded sig off the web and do what Rich said.
Then just plug the numbers in where you need them.
We use Esko Suite 7 as well and been doing it this way for years. Works well and easy to do.

good luck,
David

 

[sweisens]

do you put the numbers in the sig? What do you use for a bottling factor?

 

[rich apollo]

For bottling you'd have to punch it top and bottom (on the face) and measure the difference, wouldn't you?

 

[sweisens]

fast impose swings the pages using 2 factors. One is put in the bottling tab on the sig. the other is a factor in the impose itself. What I have done is counted the right angle folds on a printed sample. Then added that number in the sig. When I make the impose I add a bottling factor. In the paperwork from Esko, the example of this factor is 1.2. With hole numbers in the sig (1 for outside spreads, & 16 for center spread). it swings the pages by inches. In experementing, I add .0026 to the factor and get about .0625 swing on the center spread. On the outside spread the swing is .004. this will work for this stock. We use many stocks and would have to use trial and error to find the correct factor for each stock. I was wondering what numbers you use in the sig. and the factor used with it.