A flat piece of corrugated fiberboard., which has been cut, slotted and scored., is called box blank. For some box styles, in order to make a box, the two ends of the box blank must be fastened together with tape, staples or glue. The place where these two ends meet is known as the manufacturer's joint.
Liquid adhesives are most often used to join the two surfaces. Often there is a glue tab, extending along one end ofthe box blank. This tab is scored and folded to form one corner of the box when joined. The tab can be joined to either the inside or the outside of the box. If there is no tab, the box must be joined using tape. Item 222 (see Rules and Regulations, Carrier Rules) requires a minimum 1 1/4-inch overlap with adhesive coverage of the entire contact area, and gives specifications for the tape used and the distance between the staples. Not all boxes have manufacturer's joints; for example, the bliss box does not However, most widely used box styles have a manufacturer's joint.
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