Manufacturer’s joint is an even piece of corrugated fiberboard which has been cut, slotted, and scored. It is called box blank. To make a box in some varieties, the two ends of the box blank must be fixed firmly together with tape, staples, or glue. The point where these two ends meet is known as the manufacturer’s joint.
Different Types of Corrugated Joints:
Liquid adhesives are more often than not used to join the two surfaces. Often there is a glue tab, extending along one end of the box blank. This tab is scored and folded to form one corner of the box when joined. The tab can be connected 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 gap between the staples. Not all boxes have manufacturer’s joints. Although the bliss box does not have manufacturer’s joints, most commonly used box styles do have them.