Barbed tape

Barbed tape was invented in Germany during the First World War as an extreme measure in the conditions of a shortage of wire. In the same period, the Frenchman Bruno suggested wrapping the barbed wire around the drum and quickly mounting the barbed spiral in the field using long poles. Subsequently, barbed wire spiral barriers were called the Bruno Spiral .

After the First World War in the 1930s, the German inventor Horst Dannert invented a new type of barbed tape, he wound a high-strength wire in the form of a spiral, and at the right moment quickly turned it along the line on which it was necessary to create an obstacle. He nailed the resulting barbed spiral fence to the ground with long steel pegs. Thanks to the spring properties, the high-strength wire independently held the shape of a spiral without the aid of poles.

During World War II, from 1940-1941, Dannert's wire began to be imported into the UK. The demand was so great that there was not enough high-alloy wire, and they began to produce it from a less durable wire (yellow Dannert). In the 1960s, barbed tape twisted into a spiral was often used to enclose military installations, prisons, and psychiatric hospitals. The barbed tape had a significant drawback: it could easily be cut with ordinary scissors.

In order to complicate the cutting of barbed tape, in the early 1980s they began to reinforce it with a wire, first by twisting around the wire, and then by looping the barbed tape onto a reinforcing wire. Such reinforced barbed tape combined the cutting properties of barbed tape and the strength of the wire. There was even a patent dispute between two European companies that claimed this invention and offered it on the market under the brands: “Man Barrier” and “Razor Ribbon”.

In the early 2000s, the CIS countries gradually began to switch from using reinforced twisted barbed tape (ASKL) to reinforced barbed tape (AKL), made by compressing a stamped barbed tape onto a wire core. The reason for the transition is the higher protective properties of the rolled reinforced barbed tape.

Two types of reinforced barbed tape are known:

• from the reinforced twisted barbed tape (the tape is twisted around a reinforcing wire) - ASKL,
• from rolled reinforced barbed tape (barbed tape is rolled onto a reinforcing wire) - AKL.

The sealed barbed tape has the best protective properties due to the fact that the tape cannot be cut with scissors and separated from the reinforcing wire, making the spiral fence not prickly. A spiral of reinforced barbed tape (ASKL, or AKL) is obtained by screwing it onto a drum. To increase the protective properties, the turns of the spiral in 3-11 places are connected using wire, tape or metal staples. When this spiral is stretched, an insurmountable cylindrical piercing-cutting fence is formed.

Currently, such barbed barriers made of reinforced barbed tape are known:

• in the form of a volume spiral of various diameters;
• a flat safety barrier made of reinforced barbed tape in the form of a flat spiral;
• a mobile safety barrier (MBB) made of a three-dimensional spiral, which special forces stretch along the ground in order to quickly limit unwanted movement in a certain direction;
• spiky spikes for the fence of reinforced barbed tape;
• mesh of reinforced barbed tape with rhombic cells.

Given the fact that barbed tape barriers can be used under physical loads and in the open, it is very important that their service life is maximized.

To improve the quality and service life of barriers in the production of tape, a wire core with spring properties that is resistant to deformation is used. For the reinforced barbed tape produced in the CIS countries, high-carbon wire rope GOST 7372-79, EN 10264-2, DIN 2078, high-carbon wire GOST 9850-72, DIN 48200, high-carbon spring wire GOST GOST 9389-75, EN 10270-1 are usually used. Barbed tape is usually made of rolled galvanized low-carbon steel GOST 14918-80, GOST 19904-90, EN 10346.

An equally important condition for the efficiency and service life of spiral barbed-cutting barriers is the method of fastening adjacent turns of reinforced barbed tape, which also prevents the deformation of barriers. It is enough to connect spiral safety barriers with diameters of 450-700 mm with three to five staples around the circumference at equidistant points, on a spiral from 800 mm to 950 mm, a seven-cob way of attaching coils is better, spiral barriers with a coil diameter of 1250-1500, nine or eleven-cob way.

When using low-carbon wire in the manufacture of spiral safety barriers, as well as in the manufacture of spiral barriers with fewer brackets, the degree of galvanizing of the materials from which the barriers are made becomes less important, since the barriers can become unusable from deformation long before they are subject to corrosion .

Galvanization of materials additionally increases the service life of barriers, in some cases, in addition to galvanizing, they are coated with a polymer coating to paint the fence of a certain color. The polymer coating effectively protects the barbed tape from the effects of acid fumes and salt spray.

Galvanization of materials is important when using products from reinforced barbed tape in places where salt water gets on it. Seawater can cause significant damage even to a good zinc coating. To protect thorny barriers from aggressive environments, they are coated with a polymer coating that does not interact with salts and most acids.

Since the wire has a larger diameter than the thickness of the barbed tape, it is the barbed tape that first of all needs reliable protection against corrosion. The optimum degree of zinc coating for the wire is 80-120 g / m2, for barbed tape in the range of 140-290 g / m2.

The use of high alloy wire also significantly increases the resistance of the reinforcing wire to corrosion processes.