Other fastening and fastening elements
Introduction
Load securing elements are tapes or straps provided with hooks and tensioners that are used to secure cargo or luggage during transport.
The material that is usually used is polypropylene due to its low cost, although due to its low maximum possible load, its use is not recommended for security applications. The higher-cost polyester restraints "Polyester (polymer)") are validated for much more professional use.
Polyester fastening
To reduce expansion during use, fasteners are typically stressed after manufacturing. To increase the density of the surface and improve the resistance of the material to dirt, it is subjected to an impregnation process. The standard width is 25, 35, 50 and 75 mm and its breaking stress ranges between 250 and 10,000 daN "Newton (unit)") (1 Decanewton = 10 Newton).
The hardware is sewn with safety seams and along with them a textile tape is also sewn with the characteristics of the fastening (material, breaking stress, validation standard).
Tension closure
The simplest fasteners are secured with a cast metal closure. The closure consists of a deviating rib and a ribbed presser jaw. The tape can slide in one direction, but not in the opposite direction due to the locking of the presser jaw.
Ratchet
With the help of ratchets "Ratchet (mechanics)") elasticities "Elasticity (solid mechanics)") of up to 500 daN are generally achieved. However, there are special ratchets (DoTension) that can reach 1000 daN. High-end ratchets are made of stainless steel or reinforced with zinc. In professional loads (for trucks) 3 types of ratchets are used: long lever ratchets, short lever ratchets and heavy load ratchets. Additionally, ratchets are divided into three groups based on the direction in which the force occurs to create the initial elasticity: the tractor ratchet, the shock ratchet, and the multiple ratchet (tractor and shock).
Final hardware
Depending on the field of application, the fasteners are provided with different types of hardware. The most common are pointed hooks, pointed hooks with closure, triangles (hanger, eye), triangle hooks, claw hooks, frame hooks and flat hooks.