In-Plate... Glue is applied to the paper while it is in the fold plate. (See figure 1) The glue head(s) are mounted on the paper stop in the fold plate. This system is used almost specifically for spot gluing. Self-mailers requiring spot gluing can be produced using common letter folds and half folds. This system will have a lower initial cost since the fold plates only need grooves. A groove is necessary for the glue to pass through without being wiped off. Grooved fold rollers are normally not needed since the glue does not contact them.
In-Line... Glue is applied at the register table as the papers flows "in line" to the fold rollers. The glue head(s) are mounted onto a tie bar just before the fold rollers. (See figure 2) You can use an in-line glue system for spot-gluing self-mailers and line-gluing booklets, side seams, etc. These systems require grooves in the fold rollers and the fold plates that accept exposed glue. Some modifications to the sheet guide on the register table may also be needed if a line of glue is required within one inch or less from the left edge of the sheet.
Standard fold rollers can be removed to have grooves machined where needed, then be reinstalled. If multiple groove locations are required, segmented fold rollers should be installed. The segmented fold roller consists of a shaft with numerous roller segments that have individual set screws. It gives the most flexibility to the operator, and the groove can be closed when not in use. This type of system gives the most application capabilities, but also costs more.

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Last Updated January 24, 2005