Load Security Best Practices: Applying Tension and Edge Protection

Plastic strapping is a flexible banding material used to secure goods for storage and transport. It stabilizes loads when applied with correct tension, combined with edge protection, to prevent damage and strap indentation on fragile or irregular cargo.

Plastic strapping (also called polymer strapping or banding) is a common load restraint material used throughout warehousing and transportation to bundle items, stabilize palletized goods, and secure irregular or fragile shipments. For beginners, the two most widely used materials are polypropylene (PP) and polyester (PET). PP is lightweight, economical, and suited for light-to-moderate holding requirements; PET offers higher tensile strength and better elongation recovery, making it preferable for heavier or long-haul shipments. The effectiveness of plastic strapping depends not just on material selection, but critically on correct tensioning, sealing, and the use of edge protection—especially for delicate, irregularly shaped, or high-value cargo.

Why edge protection matters:

When straps are tensioned, they concentrate compressive force along narrow contact lines. Without an interface, strap edges can dig into packaging, straps can cut into product corners, and fragile goods can deform or crack. Corner protectors (edge boards), also called edge protectors or edge guards, distribute the strap pressure over a wider surface, reducing local stress and preventing strap indentation. They also prevent straps from sliding sideways on unstable products and help keep tension uniform across the load.

Components and basic tools:

• Strap material: PP (polypropylene) for economical, light-duty; PET (polyester) for medium-to-heavy duty and low elongation loss over time.
• Strap widths: common widths include 12 mm, 16 mm, 19 mm, and 25 mm; wider straps spread force better and reduce indenting.
• Sealing methods: heat-weld (common with PET), friction-weld, seal (metal crimp) closures, or buckles depending on strap and tool.
• Tensioning tools: manual or battery-powered tensioners, pneumatic tensioners, and combination tools that tension and seal.
• Edge protection: cardboard or plastic corner protectors sized to span the strap width and the package corner; rigid edge boards for stacked pallets; custom-formed protectors for irregular shapes.

Standardized operational procedure — applying tension with edge protection

• Assess the load: Identify fragility, center of gravity, irregularities, and packaging strength. Determine strap material and width based on load weight, surface, and transit conditions.
• Select edge protection: Use corner protectors for pallet corners, U-shaped edge boards for stacked layers, or molded protectors for cylindrical and irregular shapes. Ensure the protector’s length covers the strap contact area and that it has sufficient rigidity to distribute forces.
• Position straps and protectors: Place edge protectors under or over the strap contact points before tensioning. For pallet loads, position protectors on all corners and consider intermediate protectors for fragile case layers.
• Apply initial tension: Hand-feed the strap around the load and pull snug to remove slack. Use a tensioner to apply controlled tension—enough to immobilize the load but not so much as to deform packaging or product.
• Seal or weld: Depending on strap type and sealing method, secure the strap with a seal, weld, or buckle while maintaining tension. With PET, a heat or friction weld often gives the most reliable, low-profile joint.
• Check and adjust: Inspect the strap-to-protector contact for even compression. Re-tension if necessary, and ensure edge protectors are seated flat and haven’t been forced into product corners.
• Final verification: Confirm load immobility by attempting slight lateral and vertical movement. Document tension settings and materials used if required for freight claims or compliance.

Best practices and operational tips (beginner-friendly)

• Always use edge protection on fragile, soft, or irregular products and on high-tension applications. Cardboard or plastic corner protectors are inexpensive insurance against damage.
• Match strap width and material to the application. Wider PET straps reduce point pressure versus narrow PP straps.
• Use calibrated tensioning equipment and follow manufacturer tension recommendations rather than relying on perceived tightness. Battery or pneumatic tensioners provide consistent, repeatable results for higher-volume operations.
• Distribute straps evenly: for palletized loads, typical patterns include two to four straps along lengthwise and crosswise axes, plus top-to-bottom straps for tall or unstable stacks.
• Where multiple straps pass over a single corner protector, stagger them slightly or use longer protectors so compression is distributed along each strap’s contact area.
• Consider internal bracing or dunnage for highly irregular loads in addition to strapping to reduce localized stress points.

Examples

• Glass panes shipped on a pallet: Use PET strapping with rigid cardboard L-edge boards placed at each vertical corner. Apply evenly spaced straps across the stack at low-to-moderate tension and use additional vertical support or cradles to prevent tilt.
• Machinery with protruding parts: Use molded plastic edge protectors that conform to contours, and strap through designated lift points or around base frames. Avoid direct contact between strap edges and painted or machined surfaces.
• Irregular boxes or soft packages: Place wider edge protectors and consider double-layered protection where strap pressure would otherwise cause puncture or denting.

Common mistakes to avoid

• Over-tensioning: Applying excessive tension can crush packaging, distort product, or cause straps to snap during transit. Avoid using tension levels based on muscle memory; use calibrated tools and documented settings.
• Skipping edge protection: Not using corner protectors on fragile or soft products leads to strap indentation, product damage, and increased claims.
• Incorrect strap selection: Using PP where PET is needed (long-distance, heavy load) can cause strap elongation and load shift. Conversely, over-specifying straps can add unnecessary cost.
• Poor sealing: Improper welds, twisted seals, or loose buckles allow strap loosening. Ensure sealing process matches strap type and tool capability.
• Inadequate inspection: Failing to re-check straps after tensioning and sealing can miss loose or partially seated protectors that will compromise security in transit.

Safety and compliance notes

Always follow tool manufacturers’ safety instructions and wear appropriate PPE when tensioning and cutting straps. For regulated cargo, ensure strapping and sealing practices meet carrier or industry standards and document material choices and applied tension where required for claims or audits.

Summary

Plastic strapping is an economical, versatile load restraint when properly matched to cargo type and applied with consistent tension. Corner protectors and edge boards are essential companions to strapping when protecting fragile or irregular goods: they redistribute strap pressure, prevent strap indentation, and help maintain load stability. Adopting standardized procedures—assessing the load, specifying correct strap materials and widths, placing edge protection, applying calibrated tension, and sealing correctly—reduces product damage, freight claims, and rework.