EP0100016B1 - Opening device for a parallelepiped package for a flowable material - Google Patents

Abstract

Described are opening means on a package for liquid. The pouring spout (3) can be formed by being torn open along a perforated line (8a, 8b) which begins at a starting point (14) below the front tip (17) and which terminates approximately in the middle of the upper end wall (6, 6'). In order to provide an air space of sufficient size above the liquid in the package, and an air entry space at the rearward end of the cut, so that the pouring jet of liquid can be accurately guided in passing over the front tip of the pouring spout, the invention provides that the perforated line (8a, 8b), in the lower triangular portion (13, 13') of the triangular flap, has a bend point (10) from which its path towards the outer, lower starting point (14) is directed markedly more sharply towards the bottom, and that a continuous cut line is provided in the starting point (14).

Description

The invention relates to a parallelepipedic package provided with opening center for flowable filling material with four side walls, a bottom and an upper end wall made of two-sided plastic-coated carrier material, for. B. cardboard, with at least one longitudinal sealing seam running into a pouring spout in at least one side wall and at least one transverse sealing seam in the bottom or the upper end wall, which has on both sides a double layered triangular flap with two oblique embossing lines, the base of which is formed by an end embossing line and the inside of which is connected to the interior of the pack along the base for forming the pouring spout, the pouring spout being able to be formed by tearing along a perforation line which passes through both layers of the triangular flap and which begins at a starting point with a continuous cutting line under the front tip of the pouring spout and after crossing the end stamp line ends approximately in the middle of the upper end wall.

From DE-A-29 28 105, which corresponds to the preamble of claim 1, parallelepipedic packs for milk or juices are known, which are opened in that one of the two triangular tabs folded down onto a side wall and fastened there is released into the plane of upper end wall is set up and pressed flat, after which, for example, a straight cut is made with scissors or is torn along a perforation line across the tip of the triangular tab to form the pouring spout. It is already known for an opening means of such a package to introduce a perforation line, which, however, has to be introduced into the packaging material (plastic-coated cardboard) in such a way that the cardboard nevertheless remains liquid-tight. This is mainly achieved by placing a cover strip in the form of a plastic film on the inside of the perforated area. This sealing measure is understandably complex and undesirable due to the separate material or the additional work step.

When making an opening cut or a line of perforations, it is desirable to cut the cut at the front lower starting point approximately in the middle of the lower triangular position, i.e. H. to arrange the lower layer of the doubled triangular flap under such an inclination that the starting point for the gate is as high as possible, d. H. as close as possible to the upper transverse sealing seam, provided that this is arranged at the top (or on the upper end wall). The reason for this is that the largest possible headspace or air space above the liquid level is obtained immediately after opening. Otherwise the liquid would run out of the opening immediately after the gate.

If the longitudinal seal seam now runs in the side wall in the vicinity of which the triangular flap to be opened is arranged, i. H. if the longitudinal sealing seam runs into the later pouring spout, this results in a more or less obliquely intersecting cutting or tear line which crosses this longitudinal sealing seam and which runs relatively flat. The consequence of this is that the outer lower starting point, from which the gate or tear-off begins, lies relatively high next to the front tip of the pouring spout. This has the disadvantage that the pouring jet follows the cutting or tearing edge along the line crossing the longitudinal sealing seam, so that the pouring jet is not formed and guided solely by the front tip of the pouring spout. The result is disadvantageous spilling because part of the pouring jet runs from the edge at the lower starting point, and this is undesirable. So far, no way has been seen to circumvent this disadvantage, because steeper positioning would immediately result in the entire course of the perforation or cutting line being inclined too much downwards and the necessary headspace above the liquid level not being available when pouring out. In addition, the rear end of this line for tearing off or cutting off the triangular tip to form the pouring spout would then lie so far from the tip of the pouring spout that sufficient air could not flow into the pack during the pouring to compensate for volume. This also results in a disadvantageous pouring effect because the liquid jet begins to pulsate. The end user calls this process "pouring under sloshes".

The object of the invention is therefore to provide a parallelepipedic packing of the type described at the outset, with which the creation of a sufficiently large head space on the one hand, an air inlet space at the rear end of the cut or the line on the other hand and finally and mainly avoiding the too high one Starting point is made possible so that the pouring jet can actually run precisely guided over the front tip of the pouring spout and its adjacent edges.

This object is achieved according to the invention in that the perforation line in the lower triangular position of the triangular lobe has a break point, from which its course towards the outer, lower starting point is directed much steeper towards the floor.

Although it is assumed on the basis of the embodiments described below and predominantly also in the general description that the perforation line is straight, there are also other shapes which form comparatively good opening means, and even these can be provided according to the invention Attach a break point at which it is sufficient if the condition from this break point forward towards the longitudinal seal seam is steeper towards the lower starting point and steeper towards the ground. As a result, the critical starting point is shifted downward away from the front tip of the pouring spout. However, this means that the edge crossing the longitudinal seal seam is drawn so deep that the liquid flowing out through the front tip of the pouring spout no longer follows this line in the form of the pouring jet, and certainly does not attempt to run off over the starting point at the gate. This eliminates the disadvantages found in the prior art. Packs of the type described above are produced as bulk goods in extraordinarily large numbers in short time units, filled and dispensed by machines in which certain tolerances must be permitted. Therefore, care should also be taken to ensure that the beginning line is a cut at the outer lower starting point next to the gate.

The position of the oblique embossing line, which forms the outer edge of the double triangular flap, has already been described at the beginning. If you look from the front onto the package and the pouring spout, then of course two inclined embossing lines run towards each other from the bottom outside to the top center. If you look at the pack from the side and if possible also in a flat state, the description will be easier, because it is sufficient to speak of the only oblique embossing line lying there, especially since the other oblique embossing line in the second layer is directly congruent behind it. Already in the above-described course of the perforation line across the break point, the pack is best viewed from the side in the flat state. Seen from the middle of the pack to the front edge under the pouring spout, the longitudinal seal seam lies on the front outer edge. The longitudinal sealing seam is a double cardboard strip, in which a sealing line is arranged. This makes the longitudinal seal seam liquid-tight. The double-layered cardboard strip that forms the longitudinal sealing seam is somewhat wider than the sealing line itself. The longitudinal boundaries of the longitudinal sealing seam are the end edge on the outside on the one hand, and a border line on the inside, which runs parallel to the longitudinal sealing seam at its inner end. The above-mentioned line crossing the longitudinal sealing seam when cutting or tearing off to create the pouring spout crosses the longitudinal sealing seam at the boundary stamping line, which cuts it at an angle. In this way, a point is defined, a limit point at which the aforementioned break point could just lie towards the longitudinal seal seam. Another point of intersection is the intersection of the perforation line and the oblique line.

It is therefore expedient if the kink lies on a line that runs from the oblique embossing line to the border embossing line between the front side wall and the longitudinal sealing seam. The conditions and advantages mentioned at the outset are met or arise when the kink lies at any point on the line just described, starting at one limit point on the oblique beating line up to the other boundary point, namely on the boundary beating line. It is not expedient to arrange the break point outside this line section of the perforation line defined in this way.

It is also advantageous if, in order to form the cutting line at the starting point, the cutting line is provided through the later separating cut between two pack blanks running one behind the other.

It has already been explained above that with all tolerances in the production of the liquid packs from cardboard, care should nevertheless be taken to ensure that there is a clear cut at the lower, outer starting point. In order to guarantee this, the pattern of the perforation line or its course with the cut end should be carefully prepared and placed correctly when the pack is cut. There is of course a later cut between two consecutive pack blanks. If, according to the invention, the cutting line is now arranged so that it cannot disturb the welding lines in the longitudinal sealing seams, it is nevertheless arranged on the boundary between two longitudinal sealing seams in the area of the blanks in such a way that it runs over this later separating cut, then it is certainly also with The creation of packs with tolerances ensures that there is a clear cut at the starting point of the perforation line.

It is also favorable if the cutting depth of the entire perforation line, including the cutting line, extends from the outside through the outer plastic coating and through the carrier material to its interface on the inner plastic coating. At the beginning, the application of plastic cover strips on the inside of the packaging after introducing the known perforation line was discussed. The disadvantage of this separate sticking of a separate piece of strip was also pointed out. The above measures ensure the necessary tightness, and yet a plastic strip does not need to be placed separately on the perforation area. The perforation line consists of a chain of cuts following the line, which alternate with webs of packing material that have remained in between. The cuts are provided according to the invention in such a way that they pass through the outer plastic coating and through the carrier material, but not through the inner layer, which in most cases is more developed than the outer plastic coating. Practice has shown that perforation lines formed in this way have sufficient weakening and line alignment when torn but ensure adequate tightness during transport.

In order to produce such an opening means on a parallelepipedic pack of the type described in the introduction, a device is provided according to the invention, which is characterized in that a knife having two adjacent planar parts arranged at an angle to one another is attached stationarily over a roller which can be moved away at a certain distance below the cutting edge is and is provided protruding in a space for the coated carrier material. The manufacturing device for a parallelepipedic pack with the correct perforation line was previously not conceivable in specialist circles because the arrangement of a cut or a perforation line with a kink point was not economically possible. It was known that perforation lines of various designs could be introduced into packaging material, but if the tolerances mentioned were observed, a perforation line with a specific kink point in predetermined areas was not possible without excessive effort. However, if, according to the invention, the knife is arranged in the manner described above and is arranged without touching it at a distance from a roller that can be moved beneath it, any desired cutting line can be formed, an exact cutting depth and exact position of the break point can be achieved. Obviously, the position of the break point with respect to the start and end points of the perforation line can be observed very precisely in this way, in which case only the position of the carrier material to be processed relative to the knife, possibly electronically controlled, has to be set.

It is advantageous if the knife is provided so as to protrude through a recess in a movable wiper that is resiliently biased towards the roller. It is very useful to design the perforation line as a straight line or as two straight lines separated by an inflection point. Such knives can be easily manufactured and precisely held, e.g. B. by pinching. So that the packaging material to be processed can be easily removed from the knife after the cut, the scraper is attached, the recess of which encompasses the knife outline to a relatively narrow extent, so that a precise introduction of the cut and detachment of the paper from the knife are possible.

In an advantageous further embodiment of the invention, the roller is movably guided in the recess of a stationary roller guide, and the roller guide has a horizontal section in the region of the knife and a lifting section at both ends of which is directed obliquely downwards from the knife. Due to the stationary arrangement, the roller guide can be arranged exactly at a distance from the knife or its knife carrier, so that in the horizontal section the roller has and maintains an exact distance from the lower knife edge. The lifting sections lead the roll out of engagement with the packaging material, so that the latter can be transported further through the space under the knife when the roll is located in the lifting sections.

It is also advantageous in the invention if the roller is held on a shaft by means of ball bearings, which in turn is held in separate ball bearings in the roller guide, and if the diameter of the roller is larger than the diameter of the ball bearing of the shaft in the roller guide. The roller diameter must be larger than the diameter of the ball bearing in the roller guide so that the roller can come under pressure with the paper and touch the paper. On the other hand, this also results in different peripheral speeds for the roller on the one hand and its ball bearing on the other. This in turn requires the roller to be stored separately and the shaft separately. The measures according to the invention take into account all of these structural details, and any difficulties in making the cut along the perforation line are solved in an advantageous manner.

In a preferred further embodiment of the invention, it is expedient if two cutting devices with knives and rollers, which are connected to one another via a connecting link, are provided at an interval and are driven intermittently. If one arranges the perforation line described in the middle where the longitudinal sealing seam does not protrude in a tab-like manner, then a single cutting device with knife and roller is sufficient. Then, however, at least in the middle of the side wall of the package under the triangular flap with the pouring spout, the user cannot take up larger areas for gripping and tearing off the triangular cone because the triangular cone to be torn off is small. If, on the other hand, you arrange the longitudinal sealing seam from under the pouring spout, the area of the triangular top to be torn off increases because the longitudinal sealing seam can also be used as a gripping surface. But then the double perforation line must be designed so that one half is arranged on one side and the other on the other side of the blank. The distance between them is bridged in the device for producing the opening means by the connecting tab. In the area of both cutting devices, i. H. Knives with a roller that can be moved underneath, the wipers can then again be arranged, the recess of which is close to the knife and as small as possible, so that the paper is held in a defined manner and the cutting depth can be set exactly.

• Figur 1 schematisiert und teilweise abgebrochen eine Ansicht der Vorrichtung zur Herstellung der Öffnungsmittel an der beschriebenen parallelepipedischen Packung mit Blick in Richtung des Pfeiles 1 in Figur 3,
• Figur 2 eine Vergrößerung des Eingriffsbereichs der Rolle und des Messers mit dem Packstoff, wobei außer dem Messer, der Rolle und dem Packstoff alle wesentlichen Teile abgebrochen bzw. weggelassen sind,
• Figur 3 eine Draufsicht auf die Herstellungsvorrichtung mit dem Messer und der Rolle, wobei auch der durchlaufende Packstoff und der Abstreifer gezeigt sind,
• Figur 4 eine Ansicht der Schneideinrichtung in paarweisem Aufbau mit kleinerem Maßstab unter schematischer Darstellung der örtlichen Zuordnung zu der Perforationslinie im Zuschnitt,
• Figur 5 die Packstoffbahn mit zwei hintereinanderliegenden Zuschnitten zur Bildung der parallelepipedischen Packung zur Darstellung der Anordnung der Perforationslinienteile,
• Figur 6 abgebrochen den Ausgießbereich der Packung gemäß der Erfindung in flachgedrücktem Zustand, wobei gestrichelt darüber der zur Bildung der Ausgußtülle abgerissene Dreieckzipfel dargestellt ist und
• Figur 7 in perspektivischer Darstellung die Draufsicht auf die Ausgußtülle und die diese umgebenden Teile der Packung.

Further advantages and possible uses of the present invention result from the following description of preferred exemplary embodiments in conjunction with the drawings. Show it :

• Figure 1 schematically and partially broken a view of the device for manufacturing the opening means on the described parallelepipedic pack with a view in the direction of arrow 1 in FIG. 3,
• FIG. 2 shows an enlargement of the area of engagement of the roll and the knife with the packaging material, all essential parts having been broken off or left out, apart from the knife, the roll and the packaging material,
• FIG. 3 shows a plan view of the production device with the knife and the roller, the continuous packaging material and the scraper also being shown,
• FIG. 4 shows a view of the cutting device in pairs on a smaller scale, with a schematic representation of the local assignment to the perforation line in the blank,
• FIG. 5 shows the packaging material web with two blanks lying one behind the other to form the parallelepipedic packing to show the arrangement of the perforation line parts,
• Figure 6 broken off the pouring area of the package according to the invention in a flattened state, with the triangular top torn off to form the pouring spout being shown in broken lines and
• 7 shows a perspective view of the top view of the pouring spout and the parts of the pack surrounding it.

For a better understanding of the package, Figure 7 is first explained. There you can see from the parallelepiped pack the two front side wall parts 2 and 2 ', which are connected by the longitudinal sealing seam 4 running into the pouring spout 3 to the welding line 5 to form the front side wall. One can also see the two upper end wall parts 6 and 6 ', which are connected by the transverse sealing seam 7 to form the upper end wall. The lower edges forming the pouring spout 3, which are formed by the perforation line 8, are essential. 6 and 7, this perforation line 8 runs between the tear-off triangular tip 9 and the sides of the packaging material from the transverse sealing seam 7 downward in such a way that the rear straight part 8a is created first, which extends to the break point 10, previously the end embossing line 11 ( Figure 6) and then crosses the diagonal line 12. The kink 10 is therefore in each case in the lower triangular field 13 or 13 'of the double triangular lobe, which is only indicated in FIG. 7. From the break point 10 onwards, the course to the outer, lower starting point 14 is directed much sharper towards the bottom of the package. 6 shows the different inclination of the part 8b of the perforation line 8 thus formed between the points 10 and 14 compared to the other part 8a.

The longitudinal seal seam 4 is delimited towards the inside by the border line 15. The section between this boundary line 15 and the bent inclined part 8b of the perforation line 8 is defined as the boundary point 16. If you now draw a straight or curved line from this boundary point 16 (e.g. following the perforation line 8) to the oblique line 12, then it is expedient if the break point 10 between the boundary point 16 and the intersection line of the perforation line 8 with the oblique line 12 lies, including these two limit points 16 and 8/12. In the preferred embodiment of FIG. 6, the break point 10 is located between these two locations, i. H. forward below the oblique embossed line 12 on the one hand and above the limit point 16 on the other.

The meaning of this perforation line course can clearly be seen in FIG. 7. The starting point 14 in the longitudinal sealing seam 4 is in fact arranged lower down in relation to the front tip 17 of the pouring spout 3, so that the pouring jet of the filling material actually pours through the edges of the lower triangular fields 13, 13 ', which run along the section 8b of the perforation line 8, is formed and guided. There is no longer any interference from the starting point 14. Nevertheless, during pouring, air can penetrate into the package through the pouring jet through the upper end of the pouring opening, namely in the area where the end embossing line 11 abuts the perforation line 8, preferably to the right according to FIG. H. above to the cross seal seam 7.

When cutting to form this course of the perforation line 8 shown in FIGS. 6 and 7, the arrangement looks as shown in FIG. The packaging material, generally designated 18, is conveyed in the form of a web in the direction of arrow 19 after it has been led out of the cutting device to be described. The perforation line 8 is therefore already provided. Between the lower first and the upper second blank, the later separating cut 20 is shown, which runs transverse to the conveying direction 19 of the paper web. The longitudinal sealing seam 4 associated with the two adjacent blanks therefore lies above and below the same, the upper blank mainly being provided with reference numbers and described accordingly. The parallelepipedic pack created by the blanks shown in FIG. 5 has not only one longitudinal sealing seam 4 but also a longitudinal sealing seam 4a on the opposite side, each with welding line 5 or 5a. In parallel to this, one can also recognize the boundary stamping line 15, which intersects the oblique stamping line 12 and the transverse sealing seam 7. While the center line later forms the line in the bottom parallel to the direction of the arrow 19 when the package is set up, in addition to the upper transverse sealing seam 7, one can see the two wall parts 6 and 6 'and in front the two side wall parts 2 and 2'.

The perforation line 8 begins with a cut 21 or gate, which bridges the later separating cut 20, so that when the web is cut apart to separate the upper cut from the lower one at the starting point 14, a cut is certainly provided even if the subsequent separating cut in the track slightly above or below the due to tolerances the knife edge comes to rest. From the starting point 14, which is shown in FIG. Intersection point between the perforation line section 8b and the later separating cut 20 is shown, this perforation section 8b extends to the kink point 10. Thereafter, the slope or the angle of the perforation line 8 changes with respect to the direction of arrow 19 and the web edges lying parallel thereto, e.g. B. also those edges that later form the transverse sealing seam 7. This second perforation line section 8a then crosses the oblique embossing line 12, finally the end embossing line 11 and then runs obliquely into the edge which later forms the transverse sealing seam 7.

Because, in the configuration according to these blanks pack the longitudinal sealing seam 4, extends in the pouring spout 3 into 5, the user may tear off a larger Dreieckzi ^p fel 9 whose area (Figure 6) can be seen magnified by the longitudinal sealing seam.

The device for producing the precisely shaped and arranged perforation line 8 is shown in FIGS. 1 to 4, of which FIG. 2 shows the arrangement for achieving the desired depth of cut. One recognizes the packaging material, generally designated 18, the carrier material 22 of which is provided on the outside of the package with the plastic layer 23 made of polyethylene on the top and on the inner side later with the thicker plastic layer 24, also made of polyethylene. The knife, generally designated 25, consists of two flat knife parts 27 and 28 separated by the edge 26, both of which carry comb-like teeth 29 and the continuous knife 30 at the bottom, around the short cuts of the perforation line (mainly in the knife part 28) and the continuous ones To be able to make a cut with the knife part 27. The roller 31 lies at a certain distance from the lower edge 32 of the knife 25, this distance corresponding quite exactly to the thickness of the lower plastic coating 24. In this way it is possible that the depth of cut is equal to the sum of the thickness of the outer plastic layer 23 plus the thickness of the carrier material layer 22.

The more precise construction of the cutting device with knife 25 and roller 31 can be seen in the side view from FIG. 1 and in the top view from FIG. A roller guide 34 with a recess 35 located therein is fastened to a roller guide carrier 33 below the plane with the carrier material web 18, here called the paper plane for short. In the stationary roller guide 34, one can see the three sections of the recess 35, namely the horizontal middle section 35a and the lifting sections 35b, which are set on the outside at an angle downward from the knife 25. The ball bearing 36 of the shaft 37 of the roller 31 is guided in this recess 35. The lower paper guide 37 ″ is placed on the stationary roller guide 34 in the form of an externally folded sheet, in which a recess 38 is provided, through which the roller 31 can reach as it moves along the movement according to the double arrow 38 ′.

In the illustration shown below the paper plane in FIG. 1, one has a viewing direction in the transport direction of the paper, i. H. The packaging material 18 moves away from the viewer of FIG. 1 in the direction transverse to the paper plane.

If, in comparison, FIG. 3 is viewed, which is a schematic and partially broken view of the top view of FIG. 1 along the section line 111-111, the direction of view for the lower part of FIG. 1 means the view of FIG. 3 from below in the direction of FIG Paper run, which is also indicated in Figure 3 with the arrow 19.

Above the paper plane, however, FIG. 1 is a view looking in the direction of the arrow 1 in FIG. 3. This changed viewing direction for half above or below the paper plane in FIG. 1 is due to the fact that the essential parts of the invention are quick in this way and become clear from Figure 1.

The paper web 18 can be guided in the direction of the arrow 19 through the space between the lower paper guide 37 "and a stripper 39. This takes place intermittently in such a way that the carrier material web 18 is pushed so far under the knife 25 that the perforation line after the paper web has been pressed in comes to rest in the correct position from below over the knife edge 32. During the movement of the paper web, the roller 31 is located in the lifting areas 35b of the roller guide 34. In the idle state of the paper web, the axis or shaft 37 of the roller 31 is then controlled 3, the roller 31, for example, moves from the position shown in the direction of the arrow 40 to the right under the knife until each point of the knife edge 32 has made the desired incision in the paper web when the roller 31 rolls away the roller 31 is again outside the engagement area of the knife 25 in order to then into the excavation area 35b, e.g. B. on the right in Figure 1.

The wiper 39 is arranged under springs 41 loosely under the knife carrier 42 via springs 41. In order to give the knife edge 32 the correct distance from the roller 31, an adjustment plate 43 of circular, flat shape, as can be seen from FIGS. 1 and 3, is attached under the knife holder 44 and fastened by means of four screws 45. The scraper 39, which is movable in the direction perpendicular to the plane of the paper web 18, therefore presses from above against the paper web 18 or its coated surface 23 and presses the web 18 against the roller 31 with a certain pressure, thus after the engagement of the paper web 18 with the knife 25 this can be pulled out of the paper web correctly and exactly. The compression springs 41 are weak so that the stripper 39 generates only little friction during the movement phase of the paper web 18.

From Figure 3, the recess 46 is also in to see the stripper 39 movably pressing onto the surface of the carrier material 18 (resiliently pretensioned). This recess 46 lies relatively close to the cutting edge 32 lying under the knife parts 27 and 28, ie close to the knife 25 with a small area, so that the paper web 18 is held in a defined manner and the cutting depth can be exactly aligned.

The kink line 26, which can also be seen in FIG. 3, between the two flat knife parts 27 and 28 clearly represents the prerequisite for the later kink point 10 of the perforation line 8. The knife 25 is clamped to a fastening block 49 by screws 47 with a clamping part 48, which in turn over Screws 50 is attached to the top of the knife carrier 42. This is attached to the roller guide carrier 33 by means of screws 51. Under the scraper 39, which projects over the right edge of the paper web 18 in FIG. 3, the roller 31 is shown, which lies in the position shown before its action and is moved in the direction of the arrow 40 in order to introduce the perforation line 8. One can also see in this illustration the shaft 37 of the roller 31 and on the one hand the ball bearing 52 with which the roller 31 is mounted relative to the shaft 37 and on the other hand the ball bearing 53 with which the shaft 37 is guided in the recess 35 of the roller guide 34 . A connecting tab 54 is then also shown on the outside, the function of which is clear from FIG. 4.

FIG. 4 shows the two arrangements with rollers 31 and 31 'which can be moved next to one another via the stroke H in the direction of the double arrow 40'. Both roller devices are connected to one another and to the drive 55 via the connecting lugs 54. The paper web 18 with the perforation line 8 or its mirror image 8 'on the left side can again be seen; with the kink 10 or 10 'and the cut or gate 21 to be introduced through the knife section 27 with the knife 30.

After advancing the paper web 18 under the cutting and rolling device, the web is stopped when the knife 25 is in the correct position over the blanks, and then the drive 55 moves both rollers 31 and 31 'to the left from the position shown in FIG , d. H. thus in the opposite direction to arrow 40. The cut for perforation line 8 is made by passing over the knife area.

Claims (9)

1. A parallelepipedic pack provided with opening means, for filling material which is capable of flow, having four side walls, a bottom and an upper end wall (6, 6') of carrier material (22), for example cardboard, which is coated with plastics material (23, 24) on both sides, at least one longitudinal sealing seam (4, 5) which extends into a pouring spout (3) in at least one side wall (2, 2') and at least one transverse sealing seam (7) in the bottcm or the upper end wall (6, 6'), which at each of its two sides has a respective doubled triangular flap which has two inclined embossing lines (12) and the base of which is formed by an end embossing line (11) and the interior of which communicates with the interior of the pack along the base to form .the pouring spout (3), wherein the pouring spout (3) can be formed by tearing open along a perforated line (8, 8a, 8b) which passes through the two layers of the triangular flap and which begins at a starting point (14) having a continuous line (21), under the front tip (17) of the pouring spout (3), and terminates after crossing the end embossing line (11) approximately in the middle of the upper end wall (6, 6'), characterised in that in the lower triangular layer (13, 13') of the triangular flap, the perforated line (8, 8a, 8b) has a bend point (10) from which its path to the outer lower starting point (14) is directed distinctly more steeply towards the bottom.

2. A pack according to claim 1 characterised in that the bend point (10) lies on a line which extends from the inclined embossing line (12) to the boundary embossing line (15) between the front side wall (2, 2') and the longitudinal sealing seam (4).

3. A pack according to claim 1 or claim 2 characterised in that, to form the cut line (21) in the starting point (14), the cut line (21) is provided to pass through the subsequent severing cut (20) between two successive pack blanks (Figure 5).

4. A pack according to one of claims 1 to 3 characterised in that the depth of cut of the entire perforated line (8) including the cut line (21) extends from the outside through the outer plastics coating (23) and through the carrier material (22) as far as the interface thereof at the inner plastics coating (24) (Figure 2).

5. Apparatus for the production of the parallelepipedic pack according to one of claims 1 to 4 characterised in that a blade (25) having two adjacent flat portions (27, 28) which are arranged at an angle relative to each other is disposed in a stationary position above a roller (31) movable past the cutting edge (32) at a given spacing beneath same, and is provided to project into a space for the coated carrier material (18) (Figure 1).

6. Apparatus according to claim 5 characterised in that the blade (25) is provided to project through an opening (46) in a movable stripper (39) which is resiliently biased (41) towards the roller (31).

7. Apparatus according to claim 5 or claim 6 characterised in that the roller (31) is guided movably in the opening (35) of a stationary roller guide (34) and that the roller guide (34) has a horizontal portion (35a) in the region of the blade (25) and at the two ends thereof it has a respective lifting-off portion (35b) directed inclinedly downwardly away from the blade (25) (Figure 1).

8. Apparatus according to one of claims 5 to 7 characterised in that the roller (31) is mounted by means of ball bearings (52) on a shaft (37) which in turn is held in separate ball bearings (53) in the roller guide (34) and that the diameter of the roller (31) is larger than the diameter of the ball bearing (53) of the shaft (37) in the roller guide (34) (Figure 3).

9. Apparatus according to one of claims 5 to 8 characterised in that two cutting devices which are connected together by way of a connecting bar (54), with blade (25) and roller (31), are disposed at a spacing and are driven intermittently (Figure 4).

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