LINDER GmbH

In the case of our Hotmelt polyester strapping, the polyester yarns are tied together by HotMelt glue. Optimum system strength is attained when used with galvanized metal buckles. This type of strapping is also referred to as “WG strapping.” LINDER as a producer of Hotmelt polyester strapping provides you competent service, best quality and long-term experience.

As there are many different terms for “glued polyester strapping”, confusion is often the result when trying to find the right product. Many suppliers are referring to “HM”, meaning “Hotmelt” – hot-glue-strapping. Polyester filaments are not woven but glued together using hot glue. The standard terminology for this product is “Polyester Strapping”. Due to the many filaments which can be seen through the glue when stretching the strapping, many suppliers also call it filament-band of filament-structure-strapping. The very first strapping bands of this kind were called “WG”, standing for “Weather Guard”. What remained from that term are the letters “WG” contained in the item number. So the item number always contains the kind of strapping and also gives information as to the width and the tensile strength. A WG50, for example stands for a 16 mm glued filaments strapping with a length of 850 m and 450 daN linear tensile strength. The WG55 stands for a glued 16mm polyester strapping – other than the WG 50, it is the Heavy Duty type with a linear tensile strength of 600 daN and 600 m length.

As polyester strapping offers similar values in tensile strength, it has already replaced steel strapping in some areas. With a 25 mm filament-strapping (e.g. WG58), a tensile strength of up to 1000 daN can be achieved. In terms of elongation, polyester strapping nearly catches up on steel strapping, as well. Additionally, it has the advantage of lower cost as well as that it does not rust. Only the handling requires a little more effort: While steel strapping can be sealed easily via notching, a metal clamp is needed for polyester strapping. For glued filament strapping galvanized tightening buckles are necessary. Here, the threading process can be described as rather costly compared to steel strapping, especially for beginners.

Besides the fact that glued polyester strapping does not rust and also is inexpensive compared to steel strapping- regarding the strapping itself as well as the strapping device, it offers an additional advantage: the tensioning can be adjusted any time. This is also a reason why this product is of great interest and very popular among the timber processing industry. During storage wood loses a lot of humidity and therefore also volume. Every other strapping band would loosen in time and could not be adjusted – polyester strapping can.

For those customers who are beginners with strapping/packaging, LINDER is offering strapping sets which should make the first steps easier. When purchasing one of the sets you can be sure to have thought of everything. Thus, a set always consists of a strapping dispenser, strapping band in different dimensions and therefore different tensile strengths, metal clamps as well as a strapping device.

Our premium PET and PP strapping can be used with either manual devices or on fully automated machines. All common strap dimensions we can usually deliver directly. Most of our PET quality strap type are manufactured in our modern production facilities in Germany near Hamburg. Further dimensions we are happy to produce according to your individual requirements.

With many manufacturers equipping their strapping machines with a range of core retainers, our product program of course also includes different core diameters.

Additionally, LINDER as a strapping producer offers you the special option of getting your PET strapping custom printed from orders of just a single pallet. In addition to providing advertising space, personalized printing also functions as a packaging seal. With increasingly demanding security requirements this can be a significant advantage.

PP-Polypropylene-Strapping, also called PP strap, is the simplest type of strapping among plastic strapping bands and is mostly applied with automatic strapping machines. Most automatic strapping machines offer a core holder for core dimensions of 200 mm. Strapex machines use 280 mm. Moreover, PP strap is also available on a 406 mm core, which are partly used for fully automatic pallet-strapping devices, but are especially used with manual strapping devices. In that process the large roll of PP strap is set onto the dispenser cart and the strap is normally applied with battery-powered strapping devices.

PP strap is also available in dispenser boxes; there are 1,000m in one dispenser which are used with plastic buckles which eliminates the need for a strapping device.

With regard to PP strap, we can distinguish between embossed and smooth design. Some strapping machines require smooth strap, though. Signode calls their strap “Dylastic Band”.

LINDER PET strapping in comparison to the PP strapping distinguishes itself by clearly higher strength. Further the stretch is lower (higher elongation) and the stiffness is higher - even under hot, humid conditions – the latter contributes to the fact that PET strapping, also called polyester strapping or polyethylenterephthalat strapping can be processed more easily, because it can be pushed under a pallet quickly.

PET strap comes on a 406 mm core. It is green and available in strapping ranges of 9 - 25 mm. With a 19x1.27 mm PET-Strapping band, for example, a tensile strength of approx. 1,100 kg per cycle can be achieved. Hence, PET strap is especially interesting as an alternative to steel strapping. It has the clear advantage that it can be used much more efficiently than for example polyester-yarn-strapping. PET-Strapping does not need to be threaded into metal seals but can easily be tensioned and welded with the help of a battery-powered strapping device. Thanks to a so-called friction-lock, the two ends of the PET-strapping are rubbed and pressed against each other at the same time welding them together that way.

Other than band width and thickness we distinguish between smooth and embossed PET strapping: Embossed means that the strapping gets an embossment, along which the strength is measured. This is how the nominal band thickness is reached and yet material is saved which allows for a lower price but also results in a lesser tensile strength as compared to the smooth strapping.

Steal strapping is perfectly matching strappings of very heavy, sharp-edged and/or hot packages.

The variety of types of steel strapping are the result of combining four basic product characteristics:

• Dimension: The wider and thicker the steel strapping, the greater the breaking load
• Corrosion protection
• Elongation
• Winding: ribbon or oscillated winding.

Packaging steel strapping is also called strap iron or simply steel strapping. There are numerous variations which can be arranged roughly according to the following criteria: Dimension, quality grade, winding and corrosion prevention. There is steel strapping in widths from 12.7 to 31.75 mm and thicknesses from 0.38 to 1.0 mm. The broader and thicker the tape, the higher is the tensile strength.

Another parameter influencing the tensile strength of the steel strapping is its "quality grade". A simple plain strapping can be distinguished from quality strapping and high-performance strapping. Plain steel strapping is a more or less untreated steel strapping, where the edges are deburred after rolling and cutting. The elongation level is at 3-6% and the tensile strength is about 700-800 N / mm². When steel strapping is treated further, it is called quality strapping. Here the edges are not only deburred, but also rounded. The elongation level is at 6-8% and the tensile strength is higher - approx. 850 N / mm². High-performance steel strapping shows the highest values with regard to elongation and tensile strength. Here the breaking elongation is at about 14% and the strength approx. 1,050 N / mm².

In the matter of rust protection three levels can be distinguished for quality-packaging steel strapping and high-performance strapping: blued, black-coated and zinc-coated. Blued steel strapping means that the strapping was heat-treated which protects against corrosion. Strapping on the other two protection levels is coated with a varnished layer. The black-coated steel strapping has a coverage of approx. 3 microns, the zinc-coated or galvanized strapping is covered with approx. 6 microns.

Finally, steel strapping differs in the type of winding - there are oscillated or ribbon coils. With the oscillated coils the strapping is wrapped in several layers. This means that a coil is about three times wider than the width of the steel strap itself. The dispenser carts for stack winding coils normally have a lid which one unscrews, sets the steel strapping then on an axis and shuts the lid again. The ribbon coils, also called disc winding strapping, is wrapped in single layers, so the ribbon coil is as wide as the steel strapping itself. In the dispenser cart for ribbon coils, the roll is simply put inside from the top; then the strapping can be unrolled with the help of a ball bearing.

Strapping devices for either PP or PET strapping come in three basic types: manual, pneumatic power tool and battery-powered tools.

Using a manual strapping device, strapping bands are tensioned by means of a handle or lever and then closed/sealed with a metal seal or buckle. This procedure can either be done with two separate tools (cheapest version) – a tensioner and a sealer – or it can be combined in one tool. The most comfortable way is to use a magazine device or – tool where the next seal automatically "postslides" after every strapping cycle.

For users doing a lot of strapping cycles, the investment in a battery-powered strapping device pays off. Tensioning and welding of strapping bands is done the same way with every battery-powered tool: The tensioning is done by means of a tension roller, which has a toothed belt drive transporting the strapping. Then a so-called “friction-welding-method” or “rub-press-method” is used: The two ends of the strapping band are rubbed and pressed against each other at the same time which welds them together. Strap joining is performed by melting the plastic strap material through friction-inducted heat.

Outstanding cost-effectiveness among all battery-powered strapping devices features our new hand tool model LST 270. Ergonomically balanced for one-hand operations enables the tool strap tensioning and welding simply by pressing a button. An optimized user control allows the preselection of four operation modes “automatic”, “semiautomatic”, “manual” and “soft” (last mode for a gentle strapping of fragile packages). Status indication and all settings are ensured comfortable via keypad with integrated digital display unit. The LST 270 is suitable for processing of PP and PET strap ranged from 9 to 16 mm strap width and assure safe closures up to 2,750 N strap tension. A weight of only 3.7 kilograms and a very high maximum strap tension speed up to 16 m/min allows rapid and handy working. Thanks to a hanging driving wheel layout the LST hand tool can be open very easy and simple under tension.  To ensure a long-life service, low maintenance costs and solid performance the LST 270 is fitted with a brushless strapping and welding motor and also a lithium-ion battery without memory effect.

Strapping devices with pneumatic control are used a lot less than battery-powered ones as they cannot be used as flexibly (they rely on compressed air supply). However, where constant tension power is needed or where there is a great volume to be packed and strapped, pneumatic control-devices are often a good choice since they do not require a battery which in turn would have to be charged regularly.

Among strapping devices for steel strapping one can differentiate between two types depending on the supporting surface available: Steel strapping devices for round packs and for flat packs. With round packs there is no or a very small supporting surface available. For this kind of strapping only steel-strapping-devices are suitable, therefore, there is no chance of using PET- or PP-strapping.

Regarding tensioning devices for polyester strapping, also called reel tensioners, various available types differ mainly in their width or their processing quality. The standard types are tensioning devices for 10-19 mm strapping width which can be used for Polyester strapping (glued, woven, composite) and PP-strap as well as for some PET strap. The next grade then is from 25-40mm or even up to 50mm. The standard tensioning device for lashing is the LS Lash HD, which is very solid but also light in weight, thanks to the aluminum it is made of.

In contrast to our LINDER polyester textile strapping, the polyester yarns are not glued but instead crosswoven. This results in the strapping being less easily severed by sharp-edged packaging goods, and so is often used for strapping of split wood for example. Following the weaving process, our woven strapping is further refined with cold glue. Thus it becomes stiffer and enables greater system strengths when used in conjunction with metal buckles. Due to the resultant smoother surface in comparison with Hotmelt polyester strapping, the use of phosphated buckles in place of galvanized buckles is recommended. LINDER as producer of woven strapping offers highest strapping quality and all required accessories.

We as a strapping producer will assist you with great experience and know-how.

Woven Strapping Band consists of polyester filaments and distinguishes itself from the glued polyester filaments-band (Hot-Melt-Band) which is widely known. The tensile strength values of both (Hot-Melt versus Woven Strapping Band) are the same, and yet it happens that ordinary polyester strapping breaks in some cases, whereas woven strapping remains stable. This is due so the structure of woven strapping which cannot be severed by sharp-edged goods. This is why woven strapping is extremely popular for example among customers who need do bundle sharp-edged sawn timber.

During the work with woven strapping attention needs to be paid to the seals: To reach optimal stability, phosphated tightening buckles need to be used (as opposed to the known zinc coated metal seals used with the glued polyester strapping). Due to the glue of the normal polyester strapping and the (wax-like feeling) surface, the strapping band sticks to the galvanized metal clamps in the most optimal way. As woven strapping is made without the use of glue, it needs a buckle with a roughened surface to let strapping and buckle stick to one another properly. This is the case with phosphated tightening buckles.

Other than mentioned, we also offer Strapping-Sets in our online-shop which consist of a solid strapping device, a package of galvanized metal clamps, a high-grade dispenser including a tray and a hand brake as well as 2 roles woven strapping band. Ordering this complete set, you can be sure that every component you need is included and also that you have effected an economy comparing this offer to purchasing in single orders.