The tabbing system described in earlier chapters will hold together strongly almost any straight-edged, flat-faced packaging form (and certain curved-edged, curved-faced forms), but tabs alone will not lock every form tight shut. It is sometimes necessary to add a special lock to the lid or to the base, or both, or to include a glue tab. These extras should not be thought of as compromises, but as important parts of the design, whose inclusion gives strength to an innovative design and so makes it totally practical.
The four most common closures are described on the following pages.
5.1 Glue Tab
Glue gives a ...