DD292188A5 - U-FOAMED CLOSURE OF BAND MATERIAL FOR BAG AND TOWEL - Google Patents

Abstract

For U-shaped Verschluszklammern for bags and hoses made of bandfoermigem material consisting of a clamp base (7) and two legs (4), and in which the leg ends of the clip are bent outwards auszen and so forming a connecting web (2) through which the clip is detachably connected in a strand, forming when removing the individual staples from the strand at the separation point cutting burrs that protrude beyond the bandwidth of the clip, which damage the sealed packaging and other packaging can occur. To avoid this, the bandwidth in the region of the leg ends (6) over a portion (3) of the legs (4) and over the connecting web (2) on both sides almost parallel reduced. It is thereby achieved that the leg ends (6) bent to the outside are uniformly within the band width on the outside of the legs (4), without a cutting burr extending beyond the band width. Fig. 1 {Verschluszklammer; Bag; Hoses; Damp ground; Leg; Connecting web; bandwidth; Leg ends; Schneidgeraet; band-shaped material}

Description

For this 2 pages drawings

Field of application of the invention

The invention relates to a U-förmiqe terminal clip made of strip material for bags and tubes.

Characteristic of the known prior art

The closure clip consists of a clip base and two legs, the ends of which are bent outward and form a separable connecting web with the leg ends of adjacent brackets. To seal a packaging wrapper, the portion of the bag or tube (eg, a stuffed sausage casing) shirred into a plait is inserted into the clip, which in turn is held in the die corresponding to the clip base. Then the legs of the clip are cut off from the staple strand with the aid of a closing punch moved against the die, and the wrapped plait is bent around the braid so that the braid is closed by the staple. The leg ends are pressed against the outer sides of the legs.

When separating the individual staples from the band-shaped strand, cutting burrs are produced at the separation point in the region of the connecting web. These can protrude after closing and pressing the leg ends of the leg outer sides in particular laterally beyond the bandwidth of the clip, if the band, before the entire clip including the connecting web is approximately constant, as was the case with previously used Verschlußklammem (DE-PS 1078495, DE-OS 2606658 and DE-OS 3148757). This creates the risk that the sealed packaging, such as the shell of a sausage, is injured. In addition, there is a risk that bui further processing, z. B. when cooking, other packaging will be injured. Finally, in cases where the sealed sausage is sealed in an evacuated secondary packaging, it may be injured by the divider, which has often caused the user to cut the sealed sausage closure clip into the secondary packaging prior to packaging. This extra effort is time consuming and costly.

Therefore, in the case of the closure clip strand known from DE-OS 1761 616, the connecting web approximately symmetrically to the ideal parting line on a two-sided arcuate constriction, which reduces the bandwidth on both sides. As a result, the lateral protrusion of burrs of the cutting edges should be avoided at the outwardly bent leg ends after closing. This has also been largely achieved, so that it was no longer necessary in many cases, for. B. before a secondary packaging to cut the sealing clip of the sausage.

However, it has been shown that the bent leg ends are not always pressed as part of the connecting web by the Verschließstempel centrally to the bandwidth on the outer sides of the legs. Rather, it sometimes comes when closing to a slight tilting, so that the leg ends are pivoted slightly to the side. They then protrude laterally over the adjacent leg. The required avoidance of over the bandwidth protruding ridges were therefore not achieved with sufficient certainty.

Object of the invention

The aim of the invention is to increase the utility value properties of closure clips of the generic type in a cost effective manner.

Explanation of the essence of the invention

The invention has for its object to provide a staple closure for bags and tubes, which ensures a reliable closure and has no over the bandwidth protruding ridges to develop. This object is achieved according to the invention in that in a closure clip as part of a band-shaped closure clip strand, the reduction of the bandwidth of the leg ends also extends over each of a subsequent end of the leg portion and in the region of reduced bandwidth, the outer edges of the ends and portions of Legs approximately parallel. Due to their parallel boundary, the narrower legs can be guided during the closing in the separating and closing punch - for example with the aid of the lateral edges of a groove or such recess. The closing movement of the legs is not hindered, but their lateral Ausst pivoting (center offset) safely avoided. At the same time, the separating and closing punch also acts directly on the legs laterally next to the bent leg ends and closes the clamp. In addition - in contrast to known closure clips - the bandwidth is also reduced at the kinks of the leg ends and therefore the pressing of the leg ends when closing a lesser bending resistance is opposed. This has an especially significant effect on thick strip material and is also significant, especially with regard to the shortness of the leg ends to be bent and the correspondingly small lever arms, as well as the secure guidance of the leg ends in the punch. As a result, the bent leg ends are also pressed closer to the legs, which further reduces the risk that the closure clip causes damage later. In the same direction acts in the narrower band area higher surface pressure during closing, which almost completely pushes the outer cutting degree.

Although it is known to guide a closure clip during V6rschließens form-fitting manner in the separating and Verschließwerkzeugen, with the aid of a band of the single - staple almost completely encircling rib, which is received by corresponding grooves in Verschließstempel and the die. It is disadvantageous that the rib stiffens the clip and thereby increases the required closing pressure; Furthermore, the fact that in the region of the unsupported projecting into the groove rib when closing no pressure on the clamp is applied, so that uneven bending and flow processes in the clip when closing the result. An excitation, in the manner according to the invention, to guide only the ends of a staple separated by severing from a strand and thereby achieve the advantageous effects set out above, could not be deduced from this. Also, other publications can not provide such a suggestion, because they suggest - to achieve another goal - a change in the band thickness and not the bandwidth.

Furthermore, according to the invention, the reduction of the bandwidth is between 5 and 40%, preferably between 10 and 30%.

A preferred embodiment of the invention is that at the bottom of the strip material at the transition from the staple leg to the connecting web ever a gutter or U-shaped impression is attached, With this U-shaped embossing in addition to the erfir to the invention closure clip advantages are obtained, the are described in known Vorveröffentlichungen.

A further preferred embodiment of the invention is that in a closure clip according to the invention, which has said U-shaped indentations, on the bottom or top of the connecting web between the U-shaped indentations in the longitudinal direction a hollow curvature is provided, in the middle of the Band thickness is even lower than in the area of the U-shaped impressions. Although known closure clips already have a hollow curvature on the upper side of the connecting web. However, this hollow curvature is longer than the distance between the mutually facing boundaries of the U-shaped impressions. Therefore arises between the U-shaped impression and the outlet of the curvature of a smaller band thickness than in the region of the center of the curvature, ie at the later separation point. As a result, there is a risk that during winding and unwinding of the staple strand to a role an arbitrary bending between the individual closure clips at that point smallest band thickness, ie in the U-shaped impression occurs. However, it is desirable that the staple strand bends during winding in the middle of the connecting web so that when unwinding a staple without kink in the U-shaped indentations exists. With such kinks in the U-shaped indentations there is a risk that the inserted in the feed in dia die clip is jammed and no perfect closure can be brought about.

By inventively proposed preferred attachment of the hollow curvature on the bottom or top between the U-shaped indentations ensures that ^! n the center of the connecting web, a desired bending point is formed and it is avoided that arise during winding and unwinding of the staple strand kinks on the U-shaped indentations. The fact that the strip thickness in the middle of the hollow curvature is less than in the region of the U-shaped embossment is additionally achieved that, also due to the reduced bandwidth according to the invention, the smallest cross-section of the strip material is present at the separation point. As a result, the often resulting in leafy form abrasion in the separation process is largely avoided, while with thicker overall cross-section of such abrasion, especially in food packaging, occasionally occurs in an undesirable manner.

-3- 292 108

Exemplary embodiments

The invention is explained below with reference to the drawings in detail. Show it

Fig. 1: a closure clip strand in perspective view;

Fig. 2a: a modified closure clip strand in side view;

Fig. 2 b: a cross section of the closure clip strand in Fig. 2a;

Fig. 3: (a and b) further modifications of the closure clip strand in one of the Figure 2 a corresponding side view.

4 shows a closing device in side view;

Fig. 5: an associated Verschliaßstempel in the middle cross-section;

Fig. 6: the closing device of Figure 4 in perspective and in the sectional plane of Figure 5 cut representation. and Fig. 7 is an illustration, corresponding to Fig. 6, of a closing device for closing the sealing ring according to the invention.

1, the ends 6 forming the connecting webs 2 (compare FIG. 2) of the legs 4 and in each case a small section 3 of the legs 4 are reduced in the bandwidth parallel to the longitudinal axis of the closure clip strand. The side surfaces 6a of the ends 6 and the side surfaces 3a of the sections 3 of the legs 4 are parallel to each other. The (later) separation point 2 a in the connecting web 2 is indicated by the dashed line. The clip bottom is designated 7.

Figs. 2 a; 3 a and 3 b show the closure clip strand 1 of FIG. 1 with U-shaped indentations 11 other transition of

Leg 4 to the connecting web 2. In Fig. 2, the locking clip strand 1 of Fig. 2 a; 3 a and 3 b with the side surfaces 3 a

of the bandwidth-reduced portion 3 shown in section.

As can be seen Fig. 2 a, the material cross-section 12 in the middle of the connecting web 2 is greater than the material cross-section 13 in the region of the U-shaped impressions 11. When winding and unwinding of the closure clip strand 1, however, at one of the U-shaped impressions 11th bend.

Therefore, Fig. 3a shows the closure clip strand 1 of Fig. 2a with a hollow curvature 14 at the bottom of the

Connecting web 2 between the U-shaped impressions 11 and Fig. 3 b with a hollow curvature 16 at the top of the

Connecting web 2 between the U-shaped impressions 11. When winding and unrolling the Verschlußk'ammerstrang bends only in the middle of the connecting web 2, the later separation point 2a.

Now follows the description of the closing device. The die 8, of which only the upper part of interest is shown in FIG. 4, has a trough-shaped recess 22 which, at the beginning of a closing operation, receives a closure clip 30, which is already closed in FIG

Abutment forms. A corrugation 24 at the bottom of the recess 22 holds the closure clip 30 during the

Closing process in the desired position when it begins with the cutting of the closure clip 30 from a strip of adjoining clips (Figure 1); For this purpose, the cutting edges 25 and 26 act together (on Verschließstempel).

The Verschließstempel 9 is movable in the direction of arrow 28 (which may be a pivoting movement with großtim swivel radius). In Figures 4; 6 and 7, the Verschpresstempel 9 has its lower end position-at the end of a closing - achieved.

The active surface 29 of the Verschiioßstempels 9 is, as can be seen Figure 4, concave. In the active surface 29, a groove 10 is incorporated, whose depth in the middle (at 31) is greatest and decreases towards the ends; in the example to zero. The largest depth of the groove is less than the thickness of the legs 4 of the closure clip 30; it only reaches the (smaller) thickness of the ends 6 at its outlet.

Fig. 5, which shows only the Verschließstempel 9, can see the cross section of the groove 10, which is rounded in the corners 32. In practice, when it comes to the sealing of sausages, in which the end of a sausage and the beginning of the next sausage are closed simultaneously, two closing devices of the type shown one behind the other, so arranged in the plane next to each other, so that left next to the in Fig. 5 Verschließstempel 9 shown another, mirror-image formed Verschließstempel (with the associated die) is located. Between both punches is a certain gap through which a cutting knife can be moved through. The drawings show the closing devices on an enlarged scale: The width of the Verschließstempels 9 shown in Fig. 5 is for example 13mm, the width of the groove 10.5mm.

After severing a closure clip 30 from the staple strand - or before closing it - the closure clip 30 has an upwardly open U-shape with diverging legs 4, followed by the ends 6 angled to the horizontal. These are detected during the closing of the groove 10 and guided laterally in this. Upon further stroke of Verschließstempels 9 bend the legs 4 to the packaging pigtail 5, with the ends 6 firmly on the

Apply outside of the legs 4, which finally results in the form shown in Figures 4 and 6. In Fig.6 is within

the closed closure clip 30 of the cut packaging pigtail 5 a sausage casing o. Like. Indicated. The closure clip 30 in FIG. 7 is that described above in which the width of the ends 6 and a subsequent part of the legs 4 are reduced. Correspondingly reduced is the width 10. The both sides of the groove 10 located portions of the active surface 29 of the Verschließstempels 9 act at least at the end of Verschließvorganges directly on the shoulders 4 a of the closure clip 30, which following the sections 3 reduced width of the itself subsequent sections are formed full width. The drawing shows that the ends 6 (of lesser width) have been pressed as parts of the former connecting web 2 centrally against the outer surface of the legs 4.

Claims (6)

1. U-shaped closure clip made of strip material for bags and tubes, consisting of a clip base and two legs, the ends of which are bent outwards, with the leg ends of adjacent brackets form a separable connecting web and have a reduced bandwidth on both sides, characterized in that the Reduction of the bandwidth also via one of the ends (6) subsequent section (3) of the legs (4) and extends in the region of reduced bandwidth, the side surfaces (6a, 3a) of the ends (6) and portions (3) of the legs ( 4) are approximately parallel. 2. Closure clip according to claim 1, characterized in that the bandwidth between 5 and 40%, preferably between 10 and 30%, is reduced. 3. Closure clip according to claim 1 and 2, characterized in that at the bottom of the strip material at the transition from the clip legs to the connecting web (2) each have a U-shaped embossment (11) is mounted, 4. Closure clip according to claim 3, characterized in that the connecting web (2) between the U-shaped indentations (11) in the longitudinal direction of a hollow curvature (14; 16), in the middle of the strip thickness (cross-section 15) is less than in Bt eich the U-shaped imprint (11). 5. Closure clip according to claim 4, characterized in that the hollow curvature (14) on the underside of the connecting web (2) is mounted. 6. Closure clip according to claim 4, characterized in that the hollow curvature (16) on the upper side of the connecting web (2) is mounted.