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How can automated packaging equipment be used to achieve cross-strapping (grid-pattern) of cartons? What key considerations should be taken into account when implementing cross-strapping packaging?
Cross-strapping (grid-pattern) case sealing and strapping is a commonly used end-of-line packaging solution in production environments. This method typically employs a strapping machine that uses PP (polypropylene) straps to reinforce cartons. Depending on the application, strapping configurations can vary—some packages require two parallel straps, others use a cross (“+”) pattern, a grid (“井”) pattern, or even an H-pattern (“工” style).
There are two typical layout configurations for implementing grid-pattern case sealing and strapping: a straight-line (inline) layout and an L-shaped layout.
Straight-Line (Inline) Layout for Grid-Strap Packaging: This setup includes one case sealer and two strapping machines arranged in parallel. A lift-and-rotate mechanism rotates the sealed carton by 90° between the two strappers to apply the second strap perpendicular to the first. However, due to inertia after rotation, the carton may not be perfectly centered. In such cases, a side-squaring (or “squaring plate”) device is often required to realign the box; without it, the quality and alignment of the grid strapping may be compromised.
L-Shaped Layout for Grid-Strap Packaging: This configuration also uses one case sealer and two strapping machines—but the strappers are positioned perpendicularly to each other. A right-angle pusher mechanism redirects the carton from the first strapping station into the second at a 90° turn. This is another widely adopted layout for grid-pattern strapping in industrial settings.
SpeedPack – Video Demonstration: Flap-Folding Case Sealer with Grid Strapping, Labeling, and Palletizing