A pallet does not become a demanding strapping job simply because it is heavy. A dense, square load with firm edges may travel more predictably than a lighter stack of cartons that settles, leans, or leaves the strap running across an unsupported corner. That is why a PET strap should never be selected from gross weight alone. The buyer first needs a usable portrait of the packed load: what can move, what can deform, where the strap touches, and what the shipment will experience after it leaves the line.
The result of this assessment is a short, testable specification rather than a weight-to-size shortcut. It should identify the candidate strap, number and position of loops, joining method, application setting, edge protection, and the conditions under which the package was approved.
Build a Load Portrait Before Looking at Strap Sizes
Gross load weight establishes the scale of the task, but it does not describe how the load behaves. Record the packed weight, pallet dimensions, center of gravity, stacking pattern, surface hardness, and transport route before comparing strap grades.
Decide What the Strap Must Prevent
Rigid loads such as blocks, tiles, pipes, and lumber resist compression but may have abrasive contact points. Cartons, textiles, and baled goods can settle after tensioning. PET is valuable for many medium- and heavy-duty loads because controlled elongation can absorb shock and help retain restraint as a load moves.
Rigid and edge-sensitive loads
Confirm corner protection and strap abrasion resistance before increasing tension. A stronger strap will still fail if a sharp edge cuts it.
Compressible or settling loads
Apply enough tension to stabilize the unit without crushing it, then verify retained tension after a dwell period.
Mixed pallets
Treat the weakest package and the least stable layer as design constraints rather than averaging the load.
Turn Movement Risk into a Restraint Requirement
Do not divide the pallet weight by the number of straps and call the result a specification. Strap forces depend on acceleration, friction, geometry, orientation, and the way each loop shares load. Use a qualified packaging method or customer requirement to establish the needed restraint, then apply a documented safety margin.
Account for joint efficiency
A friction weld or seal normally develops less strength than the unjoined parent strap. The approved joint value, not the catalog break figure alone, controls the loop.
Allow for unequal load sharing
Straps rarely carry exactly equal force. Corner geometry, tool positioning, and package movement can concentrate force in one loop.
Create a Candidate Window from the Load Profile
The published Zhuori PET range establishes what can be supplied, but the first shortlist should come from the package. Set a lower boundary from the required restraint and joint performance, then set an upper boundary from carton compression, tool capacity, corner pressure, and handling practicality. A candidate outside either boundary should be removed before the trial, even if its catalog strength appears attractive.
Keep two nearby candidates when the load data are uncertain. Trialling a sensible lower and upper option reveals whether the package is limited by strap capacity, surface pressure, joint consistency, or load construction. It is more informative than testing one oversized grade and declaring it successful.
Choose Two Candidates for the First Trial
A narrow, lighter grade may suit carton reinforcement or compact bundles when the package surface is protected. Wider and thicker grades are normally considered as load severity, contact area, and required break force increase. Very heavy, rigid, abrasive, or high-temperature loads may require a steel comparison rather than an automatic PET recommendation.
Write the Application Method into the Specification
Selection is incomplete until the intended equipment is named. Record the tool model, approved width and thickness window, joint type, target setting, and coil format. This prevents purchasing from substituting a roll that has a suitable headline strength but cannot feed, grip, cut, or weld consistently on the line. For an automatic machine, include camber and winding quality; for a portable tool, confirm that the tension and weld programs cover the proposed grade.
Treat the closure as part of the strap
The loop can only retain the force carried through its weld, seal, or buckle. Approve the closure made by the real tool, not a parent-strap figure copied from a data sheet.
Keep the operator decision simple
The work instruction should state the approved program and visual acceptance points. Operators should not have to invent settings for each pallet.
Design the Contact Points around the Package
Use corner boards or protectors where the strap crosses vulnerable cartons, coated surfaces, or sharp edges. Keep straps square to the load and prevent them from migrating into gaps. Load stability measures such as interlocking layers, anti-slip sheets, and stretch wrapping should support the strap rather than forcing it to correct a poor pallet pattern.
Approve the Package at Its Most Difficult Condition
A trial should reproduce the least forgiving version of the shipment: the highest permitted weight, weakest carton, sharpest approved edge, longest storage dwell, and normal production speed. Move the package with the same forklift contacts and restraint arrangement expected in service. Examine strap position and package shape after dwell, then repeat the check after handling. Approval belongs to that defined package, not to every load with a similar gross weight.
State the approval boundary
Describe which load family, weight range, pallet pattern, route, dwell time, and handling sequence the result covers. Link that boundary to the approved strap code and tool program so procurement cannot apply the decision to a materially different shipment.
Reopen the decision when the load changes
A new pallet pattern, route, product surface, tool, or supplier grade can invalidate the earlier result even when shipment weight is unchanged.
Conclusion
The right PET strap is selected through a load-system decision, not a simple weight label. Begin with load behavior, calculate or establish the required restraint, correct for joint performance and unequal sharing, then confirm tool compatibility and pallet protection. Guangzhou Nansha District Youjian Plastic Co., Ltd. can use the actual load details to narrow PET strapping for different load weights within the published size range, but representative package testing remains the release gate.
For repeat orders, keep an approved sample and specification revision with the packaging record. Review the setup when the product, pallet pattern, route, carrier, tool, protector, or strap grade changes. That discipline prevents a selection that worked once from being applied beyond the conditions that originally supported it.
FAQ
Can PET strapping be chosen only by pallet weight?
No. Weight is necessary, but rigidity, settling, edges, route, strap count, joint strength, and application tension also affect performance.
Does a wider PET strap always solve a heavy-load problem?
No. Width can increase capacity and contact area, but tool compatibility, thickness, joint efficiency, and load geometry must also be correct.
How much safety margin should be used?
There is no universal percentage for every shipment. Use applicable customer or transport requirements and validate the complete package under representative conditions.
When should steel remain under consideration?
Keep steel in the comparison for unusually heavy, rigid, sharp-edged, high-temperature, or rule-controlled applications where PET has not been validated.
Post time: Oct-15-2026
