Polypropylene strapping
Material and Properties
Polypropylene strapping is an extruded thermoplastic strap manufactured from polypropylene resin. It is the most widely used strapping material for general-purpose packaging applications due to its low cost, light weight, and ease of application. PP strapping is available in smooth and embossed surface finishes. Embossed strapping provides better grip in seals and buckles, while smooth strapping feeds more consistently through automatic strapping machines.
Width and Break Strength Selection
- 3/8 inch (9.5 mm) is used for light-duty bundling of small packages, newspapers, and cartons where minimal holding force is needed. Break strengths in this width range from approximately 130 to 300 lbs.
- 1/2 inch (12.7 mm) is the most common width, accounting for the majority of PP strapping applications. Available in multiple thicknesses from 0.015 to 0.031 inch, with break strengths from 300 to 600 lbs depending on thickness. Suitable for palletizing cartons, bundling products, and general shipping.
- 5/8 inch (15.9 mm) provides the widest PP strap for heavier loads, offering higher break strengths and greater load contact area for reduced cutting into soft or compressible products.
Elongation and Tension Retention
Polypropylene strapping has the highest elongation at break of any strapping material, typically 15-25%. This high elongation allows PP strapping to stretch and absorb impacts during transportation, acting as a shock absorber for the load. However, PP strapping experiences tension relaxation over time, losing approximately 50% of applied tension within the first hour. This makes PP strapping best suited for loads that are rigid and will not settle or shift during transit, rather than loads that compress or require sustained high tension.
Hand Grade vs. Machine Grade
- Hand-grade strapping is wound on 16x6 inch or 16x3 inch cores designed for use with manual tensioners, sealers, and battery-powered combination tools. Roll lengths typically range from 5,400 to 9,000 feet.
- Machine-grade strapping is wound on 8x8 inch or 9x8 inch cores designed for automatic and semi-automatic strapping machines. Roll lengths typically range from 9,000 to 18,000 feet depending on width and thickness.
Sealing Methods
PP strapping is sealed using friction-weld seals (on automatic machines), heat seals, or metal seals and buckles (for manual and battery-powered tools). Friction-weld sealing is the most common method on automatic machines, producing a strong joint without requiring consumable seals or buckles.
Specifications
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Related Products
Automatic Strapping Machines
Fully automatic strapping machines deliver high-throughput, inline pallet and bundle strapping with consistent tension, sealing, and cutting. These systems process up to 8 straps per minute using 1/2" to 5/8" PET strapping with variable frequency drive tensioning and vibration weld sealless joints via the GT41 N strapping head.
Composite Strapping
Composite strapping manufactured from high-tenacity polyester yarns with a polymer coating, available in both cord and woven configurations. Designed as a safe, lightweight alternative to steel strapping for heavy-duty load securing. Widths range from 1/2 to 1-1/2 inch with break strengths from 1,070 to 6,125 lbs. Composite strapping weighs approximately 75% less than steel, produces no sharp edges, does not rust or corrode, and absorbs shock and vibration during transit. Secured with wire buckles or metal seals rather than requiring specialized sealing tools.
Hand Strapping Tools
Hand strapping tools provide versatile and reliable solutions for strapping various packages, ensuring efficiency and ease of use. Suitable for different applications, these tools feature adjustable settings and ergonomic designs for consistent and secure strapping.
Polyester Strapping
Polyester (PET) strapping for medium to heavy-duty load securing applications where high break strength and superior tension retention are required. Available in widths from 1/2 to 1-1/4 inch with thicknesses from 0.020 to 0.050 inch and break strengths from 600 to 5,000 lbs. PET strapping retains applied tension significantly better than polypropylene, making it the preferred choice for loads that settle, compress, or shift during transit. Serves as a lighter, safer, and corrosion-free alternative to steel strapping for many heavy-duty applications.
Semi-Automatic Strapping Machines
Semi-automatic strapping machines automatically tension, seal, and cut straps while the operator positions the strap around the load. These systems process 15 to 40 straps per minute using 1/2" to 5/8" strapping with variable frequency drive tensioning and the GT41 N vibration weld strapping head.
Tabletop Strapper
Tabletop and light-duty strapping machines handle smaller packages, cases, and light bundles with cycle rates up to 20-30 straps per minute. These compact units use 1/2" to 3/4" PET straps with vibration welded joints via the GT41 N strapping head, operating on standard 120V single-phase power.