Folding Carton Style Guide

Quad Lock Bottom

Also known as the Double Lock or Ear Hook Bottom style, the Quad Lock Bottom is manually assembled. Like the 1-2-3 style, this closure style is almost always employed as a bottom closure, often paired with the top tuck closure (as shown). In a square configuration, both lock tabs engage with a shared set of lock slots, as illustrated in Fig. 3.

Category: Tubes
Description: Component Parts and Detailing for a Tube
Subcategory: Tubes With Combination Closure
Style ID: 1502