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Strapping Terms Break (or tensile) Strength: The amout of force, expressed in pounds, required to break the strap. Elongation: This is the amount of stretch in the strap as force or tension is applied. Elongation is generally retailmailingsupply expressed in the working range which is 40-60% of the break strength.Elongation Recovery: This is the strap''s ability to recover to its original state after tensioning.Shock Resistance: This is the strap''s ability to stretch and return to its original state without breaking when subjected to sudden impact. retailmailingsupply Split Resistance: The strap''s ability to withstand lateral tears. Cushioning Protect contents from vibration, impact or shock. Fragile and/or high value products with extended shipping or storage cycle times (weeks) require different cushioning products than items that are less fragile, medium weight and have shorter shipping and storage cycles. Void Fill space easily in and around the packaged contents while providing retailmailingsupply some basic cushioning. Surface Protection Conforms to a desired shape and prevents marring or scratching.

Polyester is the most rigid of all strapping materials. It elongates significantly less than polypropylene and retains tension over a longer period. Polyester is nick resistant and can be sealed with seals, heat or friction welds. Because polyester offers the greatest strength and highest retained tension of all plastic strapping, it is frequently used on heavy duty loads that need high initial tension along with high retained tension during handling and storage. Common applications are empty cans and bottles, lumber and heavy, rigid palletizing. Polyester has a smooth, shiny finish and is easy to dispose of and recycle.Polypropylene strapping is the most commonly used and least expensive of all strapping materials. It is light and easy to apply and recycle. Characteristics include high elongation and elongation recovery, retailmailingsupply but low retained tension. Polypropylene is an excellent choice for light duty palletizing, unitizing, carton closing and bundling. Because of its embossing (or waffle) pattern, strap thickness is not a useful measurement. A standard 1/2" machine grade strap can be embossed to a thickness of anywhere between .014 and .030, depending retailmailingsupply upon how deep the embossing pattern is. An overly embossed strap will be thicker, but will have a lower break strength. Carton Reinforcement: A 3:1 ratio of strap to carton weight is recommended. For a 100 lb package this could be done with (1) 300lb tensile strap or (2) 150lb straps. Unitizing and Bundling: A 5:1 ration of strap to carton weight is recommended. Palletized Cases: Required Tensile Strength = (Pallet Weight x 1.5) / # of Straps

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