The present invention relates to a device for strapping, using jaws, that allows the grouping together of two or more packets by virtue of the fact that said jaws fasten each of the straps paid out from supply reels, wherein, afterwards, a welding unit joins the two parts of the strap after the subsequently welded straps have been cut in order for same to be available for the next group of packets, wherein the jaws have a region with a knurling that fits into the depressions in the strap at the same time as the appropriate tightening is applied, preventing the formation of notches in the strap, whilst the necessary force applied in order to obtain the same tightness as compared with earlier systems is reduced owing to the fact that the area of contact between the jaws and said strap is increased.
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