Where a reusable box will be strapped on every shipment, the strap path is part of the design. Left to the packer, the band goes wherever it is easiest to reach, which is usually the place the box resists worst. A defined path costs nothing at tooling stage and removes a recurring damage mechanism.
What a strap path is
A channel, recess or reinforced band running vertically up the box at the points where the strap will pass. Its job is to hold the band in position and to give it a surface designed to carry the load. It does not have to be elaborate – a formed recess in the side wall is often enough.
Where the paths go
Vertically, at the positions the strap will occupy given the pallet pattern. That means deciding the pattern first, which is the useful part: it forces the two to be designed together rather than discovered to be incompatible later.
What it needs to survive
The strap load, repeated application, and whatever the box meets in washing and handling. A recess that deforms after five trips is worse than no recess, because the band then sits in a distorted channel and bears unevenly.
Corner versions
Where the strap turns a corner, the path has to carry the load around the turn rather than into it. That means a reinforced vertical corner, which also happens to be the feature that helps most with the impact damage described in where to put the strap.
What it costs
A recess or channel is a tooling feature, so it is close to free per unit and shows up in the tooling cost. Against a consumable protector bought on every load, it usually pays back quickly on a high-frequency lane. On a low-frequency lane the consumable may be the better answer.
Where the paths belong
Vertically, at the points the band will occupy once the pattern is fixed. That forces the pattern and the box to be designed together, which is the useful part of the exercise. A path drawn before the pattern exists gets drawn in the wrong place.
Where a box is used on more than one pallet format, it needs a path for each, or a reinforced band wide enough to cover both. The second is cheaper and slightly less good; which one is right depends on how many formats the lane uses.
What it costs and when it is worth it
A channel or recess is a tooling feature, so it is close to free per unit and shows up once in the tooling cost. Against a consumable protector bought on every load, it usually pays back within a year on a frequent lane and not at all on an occasional one.
Where a box is used across several lanes with different patterns, a single wide reinforced band is more flexible than a narrow path per pattern, and slightly less good at each. The choice depends on how many patterns the fleet has to serve.
Checking it after tooling
Band one load and look at where the strap sits relative to the channel. Where the band has ridden out of the path, the path is too shallow or the tension is too high. Both are fixable, but the earlier the check happens the cheaper it is.
What we can do
We build PP corrugated turnover boxes and can form strap channels into the side walls and reinforced corners at tooling stage. Send us the pallet pattern and we will place them where the band will actually go.