DE102015119572A1 - Strapping band, packaged goods and use of the strapping band - Google Patents

Abstract

The invention relates to a strapping for strapping a packaged goods by means of a strapping device having a longitudinal extent and a lateral extent, wherein the longitudinal extent is substantially greater than the lateral extent and the strapping band comprises a plastic, so that by means of a friction welding a firm connection of the strapping with it itself is feasible, wherein the strapping device has a laterally variable height structure and the height structure along the longitudinal extent is substantially constant.

Description

The invention relates to a strapping for strapping a packaged goods by means of a strapping device having a longitudinal extent and a lateral extent, wherein the longitudinal extent is substantially greater than the lateral extent and the strapping band comprises a plastic, so that by means of a friction welding a firm connection of the strapping with it itself is feasible as well as a packaged goods and a use of the strapping band.

Strapping is the securing of packages with a closure band. When strapping the packages are first assembled and folded with the strapping. The band is then tensioned and secured with the aid of a strapping device. Generally, strapping tools are used for tensioning and closing strapping bands and thus securing packages.

In the strapping bands are in particular plastic strapping used. Typically, these plastic strapping tapes are obtained by extrusion, so that subsequently there is a PP tape or PET tape. In particular, when processing extruded plastic strapping straps and then closing the strapping bands, usually the teeth of a tension roller engage in the strapping and pull on this. This will stretch the tape. This is usually followed by a friction closure, which is achieved by means of friction welding. In part, such a closure is also called Reib-Schweiß-Verschluss.

Essentially, two types of strapping are used.

On the one hand, flat, smooth strapping bands, which are obtained directly by means of extrusion. Such strips generally have the disadvantage that at the beginning of the friction-welding process, the strip does not undergo the necessary acceleration in order to realize friction welding as quickly as possible. For this purpose, it has been proposed to grow such strips, so that the strapping device and consequently the components which realize the welding can better grip or a better rubbing takes place.

Furthermore, plastic strapping have established, which after embossing is impressed by means of rolling after the extrusion process. Such a strap is particularly in the 1 shown. The usually embossed pattern looks diamond-shaped and should provide the necessary stability to the band as well as a good attack surface for the friction welding process. A disadvantage of these bands is that especially at the Umreifungsbandkanten Randrauigkeiten (in the figure with reference numerals 105 marked) arise. These can lead to easier fraying of the tape or can damage the packaged goods or injure a user.

The object of the invention is to improve the prior art.

The object is achieved by a strapping for strapping a packaged goods by means of a strapping device having a longitudinal extent and a lateral extent, wherein the longitudinal extent is substantially greater than the lateral extent and the strapping has a plastic, so that by means of a friction welding a firm connection of the strapping is realizable with itself and the strap has a variable lateral height structure, wherein the height structure along the longitudinal extent is substantially constant.

Thus, a plastic strapping band can be provided, in which a friction welding can be completed quickly. In particular, the friction welding can be done much faster than waxed solid strips. Also can be formed by the different lateral height structure recesses. These recesses can form an air cushion, in particular when shooting into a band frame of a strapping device or strapping machine or during friction welding, so that in particular higher accelerations and / or higher speeds as well as better sliding abilities can be realized. Due to the higher (initial) accelerations and the forming air cushion, a higher connection quality can be achieved. In addition, can be dispensed with the addition of wax in such strapping.

Furthermore, a higher stability of the strap itself is achieved by the variable height structure. In addition, due to the variable height structure, the heat generated during friction welding can be better dissipated from the point of friction welding after friction welding, so that in this regard, the friction welding is completed faster.

In contrast to strapping bands with an embossed structure, no additional rolling process is necessary for embossing the structure. In addition, the tape margins can be performed smoothly, so that damage to a packaged goods or injuring an operator occurs less frequently. In addition, frayings at the strip edges can generally be avoided.

Consequently, a strapping band can thus be provided which can be obtained directly by means of an extrusion process. Thus, the production time of such a stable belt can be minimized.

Due to the variable height structure, a resilient property of the band can also be realized, so that the packaged goods are also protected in this respect.

Thus, the above merits have surprisingly set.

The following concept is explained:
A "strapping" is in particular an extruded plastic strapping as described above.

The strapping is generally guided around the packaged goods and stretched by means of a strapping device and connected to itself by friction welding. Due to the fact that thermoplastics in particular are used, the plastic of the strapping band liquefies and forms a firm connection after cooling. Such strapping are delivered for example on rollers and the like.

"Umreifen" refers in particular to the process of securing a packaged goods by means of the strapping band.

The "Packgut" is in particular the good, which is to be secured with the strapping. For example, cartons, which consist of a lid and a lower part can be closed by means of such a strapping, so that the carton does not open during transport on the one hand and on the other hand can partially raise well. Furthermore, for example, a cardboard or box-like structure can be mounted on a pallet by means of such straps. Also, pipes and the like can be connected to each other by means of such a strapping tape in a dense package size.

A "strapping device" includes in particular manual strapping devices as well as stationary strapping devices. Manual strapping devices, for example, operated by battery and can be used manually independent of location. In stationary devices, in particular, the packaged goods are transported to the re-routing device and the strapping process takes place at a fixed position. Also, strapping devices are known which are pneumatically operated.

In general, strapping tools include a tension unit and a closure unit. The clamping unit ensures that the voltage is impressed so that the connection and securing of the packaged goods is as uniform as possible. The closing unit is responsible in particular for the actual closing process. In the present case, the closing takes place in particular by means of a friction welding unit.

A "longitudinal extent" is understood in particular to mean the elongated extent of the strapping band. As is already clear from the term strapping, it is a flat structure with a certain material thickness and a very large extent in the longitudinal direction. Rolled straps may well have tape lengths of 600m or more, which in this case corresponds to the longitudinal extent of the tape length and thus the 600m or more.

The "lateral extent" is referred to in particular as the width of the strapping band. Typical widths of such straps and thus the lateral extent are between a few millimeters and a few centimeters.

The "plastic" comprises in particular thermoplastic materials which are suitable for extrusion processes and which can be heated and bonded in particular by means of friction welding. Typical plastics are PET (polyethylene terephthalate) and PP (polypropylene). Thus, polyolefins and polyesters are included.

"Friction welding" is understood in particular to mean the process which realizes a friction closure. In particular, this is achieved in that two mutually facing surfaces clampingly surround two sides of the strapping band lying on one another and impart a heat by oscillation, which liquefies the plastic (part), resulting in a firm connection after cooling and thus solidification.

At this point it should be noted that existing strapping bands can also be connectable to one another by means of a heating wedge (also called a heating tongue), by means of ultrasound or by means of a sleeve.

A "height structure" is the structure that results in a profile cut along the lateral extent of the band in a side view. The height structure is characterized in particular by the fact that along the lateral extent the profile and thus the material thickness form different strengths and courses (see, for example, the illustrated height structures in FIG 2 ). In particular, the height structure is through given the shape of the nozzle, which imprints the actual shape of the strapping when extruding the plastic.

For a solid material, the height structure is essentially constant. In the case of strapping bands having a roll-embossed structure, a laterally variable height structure is likewise obtained, this being essentially not constant along the longitudinal extent. Thus, present lateral variable height structure according to the invention has a height change as a function of the lateral extent.

In a further embodiment, the height structure is substantially crenellated and / or wave-shaped. Thus, different implementations of the laterally variable height structure can be provided.

Under crenellated both alternating sawtooth and rectangular functions are included. In addition, the heights and widths may each have different distances.

In the wave-shaped height structure wave trough and wave crest may each be the same or different from each other.

In order to ensure optimal material flow during friction welding, the height structure can be realized with different material thicknesses.

In another embodiment, the height structure may have a height to width ratio of 1: 5, 1: 4, 1: 3, 1: 2, 1: 1, 2: 1, 3: 1, 4: 1, 5: 1. Thus, different strapping bands can be provided for different friction surfaces of the strapping apparatus, which realize the friction welding, which are each optimally adapted to the friction surfaces. In addition, it is therefore possible in particular to work towards cooling and thus rapid connection during friction welding and thus during friction locking.

To prevent fraying at the strip edges of the strap, the strap can be free of surface embossing.

Such "surface embossments" are in particular realized by rollers which are arranged after an extrusion die. In this case, the extruded strap generally passes through the rollers and thus obtains the desired surface structure.

Thus, rolling of an extruded strapping band can be dispensed with and the strapping band used directly. In addition, therefore, the material structure as well as the rolling is not affected.

As already explained, the plastic may be a polyolefin, in particular polyethylene or polypropylene.

In order to be able to provide the most time-effective and energy-optimized production process for the strapping band, the strapping band can be produced by means of an extrusion process.

"Extrusion", also referred to as extruding, is understood in particular to mean extruding, in which viscous and / or curable materials are pressed out under pressure continuously from a shaping opening (extruding die, also referred to as a die or orifice). This generally produces a body with the cross section of the opening in theoretically any length. In the present case, the body is the strapping band.

In a further embodiment, the strapping band is already closed and has a fixed connection established by friction welding, so that a closed strapping band is formed.

In a further aspect, the object is achieved by a packaged goods, in particular concrete parts, bricks, pipes or boxes, this packaged goods being secured by means of a previously described strapping band. Thus, packaged goods can be provided, which are secured by means of a Kunststoffumreifungsbandes. With these packaged goods, in particular a rattling on the strip edges is avoided, so that it is also ensured during or after the transport that the packaged goods continue to be secured by the strapping band.

In another aspect, the object is achieved by the use of the above-described strapping for strapping a packaged goods.

Furthermore, the invention will be explained in more detail with reference to the prior art and to exemplary embodiments. Show

1 a highly schematic top view of a strapping band with embossed diamond structure according to the prior art and

2a -H different embodiments of a Umreifungsbandsprofils, wherein in the figures a.) To f.) A structure height is shown enlarged and the thickness of the respective Umreifungsbandes is represented by the corresponding line thickness.

From the prior art strapping are known, which after an extrusion process an embossed structure 103 was imprinted in the form of rhombuses. Such embossed structures 103 are impressed by a rolling process by means of two rollers, which structurally structure the strapping band. In particular, in the edge regions can Randrauigkeiten to the joined Rautenecken 105 arise. Such Randrauigkeiten can lead to fraying and thus Aufribungen in packaged goods such as concrete parts or bricks. This Aufribbelungen in turn can lead to injury to an operator.

Basically has a strapping band 101 and thus also an inventive strapping band 101 an elongated extent, in this case longitudinal extent 107 called, up. In contrast to this longitudinal extension 107 is the lateral extent 109 very small. In the present case, the longitudinal extent is between 100m and 800m and the lateral extent between 0.5cm and 5cm.

There were different straps 101 produced by PET plastics. In addition, now the strapping band 101 along its lateral extent 109 cut. In the following, the cut edges (line thickness corresponds to the material thickness) are now considered in a side view (see 2 ).

In a first alternative ( 2a ) has the strapping band 101 a uniform rectangular structure, with the band edges 111 offset from each other.

In a further alternative ( 2 B ), the height structure is angular and irregular.

In the third alternative ( 2c ) the height structure is wavy.

In the fourth alternatives ( 2d ) is given a crenellated height structure, with some additional material 215 reinforcement, increase and stabilization.

In the next alternatives ( 2e ), the height structure has different structural heights 211 and different structure widths 213 on.

In the following illustrated alternative of the invention ( 2f ), the height structure is wavy, but has additional material 215 on.

The last two alternatives are particularly suitable for the strapping process. In 2g.) alternates the material thickness and in 2h.) Overlap thickened material areas, whereby a particularly stable strapping band is provided.

The in the 2a -H illustrated straps 101 are each placed around 5 concrete pipes and tightened by means of a strapping device and friction welded, so that the concrete pipes give a tight package, which with the strapping bands 101 is secured.

LIST OF REFERENCE NUMBERS

101

 strapping

103

 embossed structure

105

 Randrauhigkeiten

107

 longitudinal extent

109

 lateral expansion

211

 structure height

213

 structure width

215

 additional material

Claims (10)

Strapping band ( 101 ) for strapping a packaged goods by means of a strapping device with a longitudinal extent ( 107 ) and a lateral extent ( 109 ), wherein the longitudinal extent is substantially greater than the lateral extent and the strapping band comprises a plastic, so that in particular by means of a friction welding firm bonding of the strapping with itself is feasible, characterized by a laterally variable height structure, wherein the height structure along the longitudinal extent is essentially constant. Strap according to claim 1, characterized in that the height structure is substantially crenellated and / or wave-shaped. Strap according to one of the preceding claims, characterized in that different material thicknesses are realized by means of the height structure. Strapping band according to one of the preceding claims, characterized in that the height structure has a height-to-width ratio of 1: 5, 1: 4, 1: 3, 1: 2, 1: 1, 2: 1, 3: 1, 4: 1 and / or 5: 1. Strapping according to one of the preceding claims, characterized in that the strapping is free of surface embossing. Strap according to one of the preceding claims, characterized in that the Plastic is a polyolefin, in particular polyethylene or polypropylene. Strap according to any one of the preceding claims, characterized in that it is produced directly by means of an extrusion process. Strapping according to one of the preceding claims, characterized by a friction welding, so that a closed strapping band is formed. Packaged goods, in particular concrete parts, bricks, pipes or boxes, characterized in that this packaged goods is secured by means of a strapping band according to one of the preceding claims. Use of a strapping band according to one of claims 1 to 9 for strapping a packaged product.

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