DE19603371A1 - Bag or container-forming machine - Google Patents

Abstract

The bag forming machine has a flat spreading element (27) aligned parallel to the jaws (23). It is connected to the filling pipe (20) and points radially away from it. The spreading element lies in one plane with the sealing faces (26) of the closed jaws. A longitudinal welding component (22) is allocated to the spreading element in the foil transporting direction and is aligned against the outwardly turned edge of the sleeve.

Description

The inventions relate on the one hand to a tubular bag with a side fold and a flat tubular bag with a longitudinal seam and perpendicular to the longitudinal seam and parallel to each other, the tubular bag on the top and bottom closing transverse seams, and on the other hand a tubular bag machine for Manufacture of tubular bags.

Flat tubular bags of the type described are well known. Are with them the congruent bag surfaces on the parallel to the Longitudinally running edges simply folded over, which creates the flat bag shape is achieved. Gusseted bags are also known.

Tubular bag machines for producing such bags are also known.

The known flat, filled tubular bags of the type described have the Disadvantage that they are unsuitable for a presentation in a tray because they tend to buckle. The buckling mainly takes place in parallel to the transverse seams of the bags standing on their bottom transverse seam, and is then particularly pronounced when a row of fillings arranged one behind the other Bag in a tray is not complete, so that the fill row is supported by one Limitation of the tray does not apply.

Tubular bag machines with a gusset generator are known, in which a gusset in a film tube through a movable gusset cutter is produced. Side gusset plungers which are movable with respect to one another are also known Insert two opposite gussets into the film tube. Such Tubular bag machines produce tubular bags with one side fold or with two Gussets. The tubular bags are in the form of Cross seams welded. The gussets are only in the transverse seams shrink wrapped.

The disadvantage of the known tubular bag machines with a gusset cutter or with two gusset pliers is that the tubular bags produced as a result the gussets are relatively stable against deformation, but for many Areas of application require further stability.  

From US-PS 4,194,438 is a tubular bag machine with an asymmetrical Form shoulder known. The shape shoulder serves the longitudinal seam of a Tubular bag with a rectangular cross-section to the edge of the tubular bag offset to one that runs centrally on one side surface of the tubular bag Avoid longitudinal seam, and thereby the surface of the side surface better for to be able to use product information.

An arrangement for laying the longitudinal seam is also known from US Pat. No. 3,426,499 known in a corner of a rectangular bag.

The devices of U.S. Patent 4,194,438 and U.S. Patent 3,426,499 have the Disadvantage that their longitudinal seams only slightly buckle the corners of the tubular bag prevent.

The invention is based on the task of a flat tubular bag and a Tubular bag with gusset of the type described above and one To find a tubular bag machine for producing a tubular bag, such that the tubular bags in an upright, poorly supported arrangement on the bottom seam a significantly reduced or no longer available Show a crease and that the longitudinal seam does not print the side surfaces disturbs. The tubular bags should also be stabilized without additional parts and with the Tubular bag machine can be manufactured with high machine performance.

The problem is solved according to claims 1, 21 and 25.

The tubular bag machine according to the invention (claim 1) has on its filling tube a parallel to the jaws of the cross welding device, with which Filler pipe connected, radially pointing away from the filler pipe, flat expansion element, which lies in one plane with the sealing surfaces of the closed jaws, and a longitudinal sweat is arranged downstream of the expansion element in the film transport direction Facility.  

The tubular bag machine according to the invention has the advantage that the Tubular bags manufactured with high accuracy with relatively high machine performance can be. The longitudinal welding device heats and presses the area of the Weld. The arrangement of the expansion element in one plane with the Sealing surfaces of the closed jaws serve an exact foil run and one precisely fitting edge-side arrangement of the weld seam. The asymmetrical Form shoulder serves the edge arrangement and thus an undisturbed, as Information area serving side area.

According to claim 21 is on a flat tubular bag of the type described one designed as a longitudinal seam parallel to the edge of the tubular bag Weld seam provided.

The flat tubular bag according to the invention has the advantage that it is filled Condition a significantly reduced buckling behavior parallel to the Shows the fold line running across the seams, since the line running parallel to the longitudinal seam edge weld seam improves the rigidity of the bag. By the edge Welding the top surfaces lying on top of each other is also a shear the top surfaces largely prevented from each other, so that the tubular bag be placed upright in a tray on its bottom side transverse seam can, and also in a not completely filled row a significantly reduced Shows buckling behavior. The edge-side longitudinal seam enables a better one Use of the side surfaces of the tubular bag, e.g. B. by means of continuous, not labeling disturbed by the longitudinal seam.

The tubular bag according to claim 25 has a longitudinal seam and perpendicular to that Longitudinal seam and parallel to each other, the tubular bag on the head side and cross seams on the bottom, and a gusset. On the two in parallel to the longitudinal seam edges of the side gusset of the tubular bag a weld seam is provided. The longitudinal seam runs on the edge.  

The tubular bag with the side gusset is due to its edge welds more stable against deformation than a simple tubular bag with a side gusset. For the production of the tubular bag, a separate feed of Stiffening material not necessary, since only the material of the Foil tube is welded. The tubular bags produced can be relative can be quickly burdened with a filling, for example because they are still warm Welds on the edges of tensile forces parallel to the welds act, can not be wound, and since the welds do not Requirements for tightness must meet. The edge-side longitudinal seam serves an improved use of the side surfaces of the tubular bag as Information area.

In claims 2 to 20, 22 to 24 and 26 to 27 are further advantageous Embodiments of the invention described.

Are a radiant heater and a closing device as longitudinal welding device present (claim 2), it is achieved that the heat input into the Packaging film is done without force. This is advantageous in that the still open longitudinal area of the film tube no impairment of its shape and experiences no retention forces due to its heat absorption. The warmed longitudinal seam is then pressed by applying pressure. This application of pressure can by means of a role that can itself be driven synchronously with the film transport (claim 9), be pressed. If the wheel is driven, the longitudinal seam is distorting Forces minimized. Instead of a wheel, it can also be a relatively simple one Closing device, such as. B. a press beam can be used.

On the tubular bag machine according to the invention, two can analogously to claim 3 Spreading elements can be provided in opposite directions from the fill pipe point away, each expansion element in the film transport direction Radiant heaters and a closing device are arranged downstream. With a Such a configuration of the tubular bag machine are tubular bags with generated two edge welds. The use of two symmetrical, for The central axis of the filling pipe arranged spreading elements also has the consequence that the Forming and frictional forces when generating the edge welds are the same on both sides of the filling tube on the expansion elements, and thus the film run is not disturbed.  

Is the radiant heater at an acute angle to the surface of the fill pipe arranged, and the clear distance between the radiant heater and the filling pipe in the film transport direction (claim 4), so the melting of Plastic is gentler and there is the possibility of a Angle change to change the welding parameters.

A radiation heater oriented in the film transport direction can be used as the radiation heater Longitudinal sealing jaw (claim 5) or infrared radiation coil (claim 6) used will. The efficiency of an infrared radiation coil can be significantly increased and an accurate irradiation zone is achieved if according to claim 7 the infrared radiation coil on three sides from one to the film tube reflective, domed mirror is surrounded.

Is a pair of opposing as a closing device, the weld between their Provided lateral surfaces clamping rollers (claim 8), so the Welding of a melted longitudinal seam solely by the roll pressure respectively. The roles can be independent of the operating mode of the tubular bag machine to be arranged stationary. The roles can also with or without drive be designed. If a drive is provided, the roles are with a Rotational speed to drive, the speed of the film deduction corresponds.

There is no disruptive adhesion of the melted plastic of the film on the outer surfaces of the rollers, if the outer surfaces according to claim 10 Have coating with polytetrafluoroethylene.

As a longitudinal welding device, it is a heat sealing tape running around two rollers provided (claim 11), there is another possibility, a perform a distortion-free welding of a longitudinal seam at the edge. The Heat sealing tape is driven at the same speed as that on the Flow wrapping machine moves the film tube and welds it therefore particularly accurate, since it also has the open longitudinal slot of the film tube stabilized and fixed in place.  

A compact design of the units on the filling pipe is possible, and a more reliable one Film removal is achieved if, according to claim 12, the film removal two has opposite circumferential trigger belt, which is 90 degrees compared to the Spreading element or the spreading elements are offset on the filling tube. The Trigger belt and the spreading elements can even be arranged in one plane, whereby the aggregate pull-off belts and expansion elements achieve their densest construction. In addition, distortion forces on the film tube are compensated for relatively well.

Flat tubular bags with a fully gusseted side fold can be created be when the expansion element as a double expansion element with a between the Single spreading elements of the double spreading element engaging gusset generator is designed (claim 13). The individual expansion elements can be parallel to each other running, attached to the filler pipe expansion into which one to the filler pipe aligned gusset generator designed as a folding wire engages.

Is a cooling plate inserted into a side fold of the film tube, against which the Welding device acts (claim 14), so both edge welds the side fold are welded against the heat sink. The heat sink serves only to prevent four-layer welding. The welding device works on both sides against the cooling plate. A welding pressure can thus be applied. On each An edge weld is created on the side of the cooling plate. The slide can slide along the heat sink. An adhesion of melted foil art Fabric on the cooling plate can be prevented by the fact that according to claim 15 Cooling plate has an outer layer containing polytetrafluoroethylene. The Cooling plate can also be the gusset generator (claim 16), whereby a separate gusset generator becomes unnecessary. But is still one Double expansion element in the film transport direction of the above gusset generator provided (claim 17), the film run is further stabilized.

Is the format of the filling tube in the film transport direction from one of the form shoulders adapted format at a taper to a reduced format, where the double expansion element or the double expansion elements with the part of the filling tube is or are connected, which has the reduced format and the difference the filler tube radii of the different formats in about two thirds of the radial Expansion of the double expansion element or 1.5 times the radial expansion one of the two double expansion elements corresponds (claim 18), so is the film  hose along the filling pipe in an approximately constant spreading state. in the The film tube runs from the larger format to the smaller one as the filling tube runs Format transported. The double spreading element or the double spreading elements is or are intended for the smaller format and extend approximately as far radially outside that they compensate for the format difference.

If the film take-off is driven continuously (claim 19), then the Radiant heat with a permanently fixed radiant heater with constant Radiant power take place without changing the melting effect in the film. Take-off speed, heating distance, radiation power and cooling behavior the film can be particularly well coordinated. Like Welding conditions are particularly given when analogous to claim 19 the radiant power of the radiant heater is proportional to the speed of circulation of the film deduction.

Is the format of the filling tube in the film transport direction from one of the form shoulders adapted format at a taper to a reduced format, where the expansion element or the expansion elements is connected to the part of the filling tube or are, which has the reduced format, and the difference of Filling tube radii of the different formats in about half the radial extent corresponds to the two expansion elements (claim 20), the film tube is along the filling pipe in an approximately constant spreading state.

In the course of the filling tube, the film tube is changed from the larger format to the transported smaller format. The spreading element or the spreading elements is or are provided on the smaller format and extend approximately as far radially outside that they compensate for the format difference.

The stiffness of the flat tubular bag is further increased if analogous to the claim 22 welding seams are provided on both edges running parallel to the longitudinal seam are.

The rigidity of an edge weld is reduced in one version Claim 23 increased significantly. According to claim 23 is in an edge weld a gusset is provided, the amount of the width of the gusset being at least  corresponds to the amount of half the width of the weld. This is where the Welding four foil areas lying on top of each other. The weld is so relatively thick and stiff. If the width of the gusset is too small, that means clearly less than half the width of a weld, it can happen that the Side gusset cannot be reliably welded. The edge weld can be carried out in a relatively small width because it has no sealing function exercises.

The weld seam on the edge can also be further reinforced if according to Claim 24 an additional film strip is welded to the weld. Of the Film strips can be placed on the outer film surface or, in the case of one welded gusset into which gusset is inserted.

The rigidity of the tubular bag is further increased if analogous to claim 26 The two edges of each of the two side folds running parallel to the longitudinal seam a side fold are provided with a weld seam.

If the longitudinal seam runs in a weld seam on the edge, there is the advantage that only one welding process is sufficient to both the longitudinal seam and the to produce a weld seam at the edge for stiffening the bag.

The stability of the tubular bag is further increased and its free standing is achieved if, analogously to claim 27, the tubular bag as a standing bag with a Stand base is formed.

The tubular bag according to the invention and the Tubular bag machine according to the invention using exemplary embodiments depicting figures described in more detail. It shows:

Fig. 1 extending in a side view of a flat tubular bag with at both extending parallel to the centrally disposed longitudinal seam edges of the tubular bag welds;

Fig. 2 in a section along the flat tubular bag of Fig. 1;

FIG. 3 is a section analogous to Figure 2 a flat tubular bag having an axis extending in the peripheral weld seam longitudinal seam, and each having a gusset in a peripheral weld.

FIG. 4 in a section analogous to FIG. 2, the flat tubular bag of FIG. 3, but with an additional film strip in the edge-side weld seams;

Fig. 5 is a perspective view of folding a tubular bag with two sides and in each case the two edges of the two extending parallel to the centrally disposed longitudinal seam welds;

Fig. 6 in a section along the tubular bag of Fig. 5;

Figure 7 is a perspective view of a stand capable tubular bag with gussets and edge-side welding seams.

Fig. 8 is a horizontal section of a filling tube with a film tube of a verti cal tubular bag machine, with two double expansion elements, and each with a gusset engaging in a double expansion element for producing a tubular bag according to Fig. 5 or Fig. 7;

Fig. 9 in a side view the principle of a bagging machine for the generation supply of a bag similar to FIG. 1 with an asymmetrical forming shoulder for forming a planar film web into a film tube, a tapered filling tube, two flat expanding elements, enclosed in a vertical plane with the sealing surfaces of, circumferential jaws of a cross welding device, as well as with radiant heaters and sealing devices directed against the deflected hose edges;

Fig. 10 is a side view of the tubular bag machine of Fig. 9 rotated by a right angle in the horizontal plane, and

Fig. 11, in a section as an infrared radiation spiral out with a mirror stalteter radiant heater.

A flat tubular bag 1 has an edge-side longitudinal seam 2 and transverse seams 3 , 4 which run perpendicular to the longitudinal seam 2 and parallel to one another and which close the tubular bag 1 at the top and bottom ( FIG. 1, FIG. 2). Welded seams 7 , 8 are provided on the two edges 5 , 6 of the tubular bag 1 , which run parallel to the longitudinal seam 2 , which give an tubular bag 1 set up on the bottom transverse seam 4 an additional stiffness against buckling. The longitudinal seam 2 runs at the edge 5 of the tubular bag 1 . In the case of the weld seams 7 , 8 and the transverse seams 3 , 4 , the inner surfaces of the film 9 are welded to one another.

In a further exemplary embodiment ( FIG. 3), a side fold 10 , 11 is provided on each of the two weld seams 7 , 8 on the edge. The amount of the width of a side fold 10 , 11 roughly corresponds to the amount of the width of a weld 7 , 8 . For the purpose of further stiffening, a film strip 12 , 13 made of weldable plastic can additionally be welded into the side folds 10 , 11 ( FIG. 4).

The tubular bag machine 14 ( FIG. 9, FIG. 10) for producing flat tubular bags 1 has a supply roll 15 and deflection rolls (schematized by a deflection roll 16 ) for feeding a flat film web 17 to an asymmetrical shaped shoulder 18 . A film take-off 19 transports the film web 17 . A filling tube 20 receives the film web 17 which has been formed into a film tube 21 . The flat tubular bags 1 are filled through the filling tube 20 .

The longitudinal seam 2 of the film tube 21 is formed by means of a longitudinal welding device 22 , which contains a radiation heater 28 and a closing device 29 . The transverse seams 3 , 4 of the flat tubular bags 1 are produced with circumferential jaws 23 of a cross-welding device 24 and separated from the film tube 21 with cutting blades 25 as a separating device.

Aligned parallel to the sealing surfaces 26 of the jaws 23 and in a plane with the sealing surfaces 26 of the closed jaws 23 , flat expanding elements 27 are provided which are connected to the filling tube 20 and point radially away from the round filling tube 20 . The spreading elements 27 deflect the edges 5 , 6 of the film tube 21 . Radiation heaters 28 act on these edges 5 , 6 in order to melt the edges 5 , 6 . In the film transport direction, each radiation heater 28 is followed by a closing device 29 for pressing the melted edges 5 , 6 together .

The radiant heaters 28 are designed as longitudinal sealing jaws 30 and are oriented in the film transport direction. They are arranged parallel to the surface of the filling tube 20 . Instead of a longitudinal sealing jaw 30 can be used as radiant heater 28 also oriented in the film transport direction, are just infrared radiation coil 31 used (Fig. 11). For better radiation direction, the infrared radiation coil 31 can be surrounded on three sides by a curved mirror 32 reflecting on the film tube 21 .

Two pairs of opposing rollers 34 , which clamp the weld seams 7 , 8 between their lateral surfaces 33 , function as the closing device 29 . The rollers 34 are driven at a rotational speed which corresponds to the take-off speed of the film tube 21 through the film take-off 19 . The outer surfaces 33 of the rollers 34 are provided with a layer 35 containing polytetrafluoroethylene in order to prevent the melted plastic film from adhering to the outer surfaces 33 .

The film trigger 19 has two counter-rotating trigger straps 36 which are offset by 90 degrees with respect to the expansion elements 27 on the filling tube.

The spreading elements 27 can also be designed to produce a flat tubular bag analogous to FIG. 3 as a double spreading element 37 ( FIG. 8), each with a side gusset generator 41 that engages between the individual spreading elements 38 , 39 of each double spreading element 37 and is configured as a folding wire 40 . Tubular bags analogous to FIGS. 5 and 7, elements 38 , 39 are produced by means of further disputed individual spreading elements.

The tubular bag machine 14 is operated continuously. The film take-off 19 is operated continuously, as is the rotation of the jaws 23 about their axes 42 ( FIG. 10). The radiant power of the radiant heater 28 is proportional to the rotational speed of the film take-off 19 , so that the amount of heat introduced into the weld seams 7 , 8 is independent of the machine power.

In order to keep the radial tension of the film tube 21 approximately constant, the format of the filling tube 20 is tapered in the film transport direction from a format 43 adapted to the shape shoulder 18 from a taper 44 to a reduced format 45 , the expansion elements 27 being part of the filling tube 20 are connected, which has the reduced format 45 , and the difference between the filler pipe radii of the different formats 43 , 45 corresponds to the radial extent of an expansion element 27 .

The asymmetrical shape shoulder 18 has two collar-chest parts 46 , 47 of different lengths ( FIG. 9). The longer collar-breast part 47 extends beyond the median plane of the shaped shoulder 18 through the longitudinal axis 48 of the shoulder sleeve 49 and the center of the collar-neck part 50 , ie the tip 51 of the longer collar-breast part 47 has a greater radial distance from the longitudinal axis 48 . In this way, the foil regions forming the longitudinal seam 2 lie on one another.

A tubular bag 101 with gussets 110 , 111 has a longitudinal seam 102 and perpendicular to the longitudinal seam 102 and parallel to one another, the tubular bag 101 closing the top and bottom side transverse seams 103 , 104 ( Fig. 5, Fig. 6). Welded seams 107 , 108 are provided on each of the two edges 105 , 106 of a side gusset 110 , 111 of the tubular bag 101 which run parallel to the longitudinal seam 102 and which give an tubular bag 101 set up on the bottom transverse seam 104 an additional rigidity against buckling. The longitudinal seam 102 runs centrally between the edges 105 and 106 of the tubular bag 101 .

In another exemplary embodiment ( FIG. 7), the longitudinal seam 102 runs in a weld seam 107 on the edge. Here the inner surfaces of the film are welded together along the edge 105 . This tubular bag 101 , manufactured on a vertical tubular bag machine and designed with a stand 109 , has a minimal film requirement. Two weld seams 107 , 108 are provided on each of the two side folds 110 , 111 . The amount of the width of a weld seam 107 , 108 corresponds to a fraction of the width of a side fold 110 , 111 . For the purpose of further stiffening, a film strip made of weldable plastic could additionally be welded onto the weld seams 107 , 108 .

Reference list

1 flat tubular bag
2 longitudinal seam
3 cross seams at the top
4 bottom seams on the bottom
5 , 6 edge
7 , 8 weld
9 slide
10 , 11 gusset
12 , 13 film strips
14 tubular bag machine
15 supply roll
16 deflection roller
17 film web
18 shape shoulder
19 film deduction
20 filling tube
21 film tube
22 longitudinal welding device
23 cheek
24 cross welding device
25 cutting knives
26 sealing surface
27 expansion element
28 radiant heater
29 closing device
30 longitudinal sealing jaw
31 infrared spiral
32 mirrors
33 lateral surface
34 roll
35 layer
36 trigger straps
37 double expansion element
38 , 39 single expansion element
40 folding wire
41 gussets
42 axis
43 larger format
44 rejuvenation
45 smaller format
46 , 47 collar-chest part
48 longitudinal axis
49 shoulder sleeve
50 collar-neck part
51 top
101 tubular bag with side gusset
102 longitudinal seam
103 , 104 cross seam
105 , 106 margin
107 , 108 weld
109 stand
110 , 111 gusset

Claims (27)

1. flow pack machine with a supply roll and deflection rollers for feeding a flat film web to an asymmetrical shape shoulder, the collar-chest parts of the shape shoulder are of different lengths and the longer collar-chest part over the through the longitudinal axis of the shoulder sleeve and the middle of the collar-neck part outgoing middle plane of the form shoulder is led out with a
Film take-off for transporting the film web, a filling tube for receiving the film web formed into a film tube, a longitudinal welding device for producing a longitudinal seam on the film tube, baking a transverse welding device for producing transverse seams and with a separating device for severing the film tube, characterized in that a parallel to the jaws ( 23 ) aligned, connected to the filling tube ( 20 ), radially from
Is provided filling tube (20) off-oriented flat expanding element (27), that the spreading element (27) (26) of the closed jaws (23) lies in a plane with the sealing surfaces, and that in sheet transport direction of the expansion element (27) arranged downstream of the longitudinal welding device ( 22 ) is provided, which is directed against the deflected hose edge ( 5 , 6 ). 2. A tubular bag machine according to claim 1, characterized in that the longitudinal welding device ( 22 ) contains a radiant heater ( 28 ) and a closing device ( 29 ), the closing device ( 29 ) being in particular a roller ( 34 ). 3. A tubular bag machine according to claim 2, characterized in that two expansion elements ( 27 ) are provided, which point away from the filling tube ( 20 ) in opposite directions, and that each expansion element ( 27 ) in the film transport direction has a radiation heater ( 28 ) and a closing device ( 29 ) are subordinate. 4. flow pack machine according to claim 2 or claim 3, characterized in that the radiant heater ( 28 ) is arranged at an acute angle to the surface of the filling tube ( 20 ), and that the clear distance between the radiation heater ( 28 ) and the filling tube ( 20 ) reduced in the film transport direction. 5. A tubular bag machine according to claim 2, claim 3 or claim 4, characterized in that a longitudinal sealing jaw ( 30 ) oriented in the film transport direction is provided as the radiation heater ( 28 ). 6. A tubular bag machine according to claim 2, claim 3 or claim 4, characterized in that a straight infrared radiation coil ( 31 ) is provided as the radiation heater ( 28 ) and is oriented in the film transport direction. 7. A tubular bag machine according to claim 6, characterized in that the infrared radiation coil ( 31 ) is surrounded on three sides by a curved mirror ( 32 ) reflecting on the film tube ( 21 ). 8. tubular bag machine according to claim 2, characterized in that as a Ver closing device ( 29 ) a pair of opposing, the longitudinal seam ( 2 , 102 ) between its lateral surfaces ( 33 ) clamping rollers ( 34 ) is provided. 9. tubular bag machine according to claim 8, characterized in that the rollers ( 34 ) are driven at a rotational speed which corresponds to the take-off speed of the film take-off ( 19 ). 10. A tubular bag machine according to claim 7 or claim 8, characterized in that the outer surfaces ( 33 ) of the rollers ( 34 ) have a layer ( 35 ) containing polytetrafluoroethylene. 11. flow pack machine according to claim 1, characterized in that as Longitudinal welding device a heat sealing tape running around two rolls is provided. 12. Tubular bag machine according to claim 1, characterized in that the film take-off ( 19 ) has two counter-rotating take-off belts ( 36 ) which are offset by 90 degrees relative to the expansion element ( 27 ) or the expansion elements ( 27 ) on the filling tube ( 20 ). 13. Tubular bag machine according to claim 1 or claim 3, characterized in that the spreading element (27) is designed as Doppelspreizelement (37) with one of said Doppelspreizelementes (37) engaging between the Einzelspreizelemente (38, 39) gusseted generator (41). 14. A tubular bag machine according to claim 13, characterized in that a cooling plate ( 40 ) is inserted into a side fold ( 10 , 10 a, 11 , 11 a) of the film tube ( 21 ), against which the welding device ( 29 ) acts. 15. tubular bag machine according to claim 14, characterized in that the Cooling plate has an outer layer containing polytetrafluoroethylene. 16. A tubular bag machine according to claim 14 or claim 15, characterized in that the cooling plate ( 40 ) of the gusset generator ( 41 ). 17. A tubular bag machine according to claim 13, characterized in that in addition to the double spreading element ( 27 ) in the film transport direction protruding side gusset generator ( 23 , 13 ) is provided. 18. A tubular bag machine according to claim 13, characterized in that the format of the filling tube ( 20 ) in the film transport direction from one of the shape shoulder ( 18 ) adapted format ( 43 ) on a taper ( 44 ) to a reduced format ( 45 ) is tapered that the Double expansion element ( 27 ) or the double expansion elements ( 27 ) is or are connected to the part of the filling tube ( 20 ) which has the reduced format ( 45 ) and that the difference between the filling tube radii of the different formats ( 43 , 45 ) is approximately two thirds of the radial extent of the double spreading element ( 27 ) or 1.5 times the radial extent of one of the two double spreading elements ( 27 ) corresponds. 19. Tubular bag machine according to claim 1 or claim 12, characterized in that the film take-off ( 19 ) is driven continuously. 20. A tubular bag machine according to claim 1 or claim 3, characterized in that the format of the filling tube ( 20 ) in the film transport direction from one of the shape shoulder ( 18 ) adapted format ( 43 ) tapers to a taper ( 44 ) to a reduced format ( 45 ) is that the expansion element ( 27 ) or the expansion elements ( 27 ) is or are connected to the part of the filling tube ( 20 ) which has the reduced format ( 45 ) and that the difference between the filling tube radii of the different formats ( 43 , 45 ) corresponds approximately to half the radial extent of the expansion element ( 27 ) or the radial dimensions of the two expansion elements ( 27 ). 21. Flat tubular bag with a longitudinal seam and perpendicular to the longitudinal seam and parallel to each other, the tubular bag closing head and bottom side transverse seams, characterized in that a longitudinal seam ( 2 ) has a weld seam ( 7 , 8 ) on the edge ( 5 , 6 ) of the tubular bag ( 1 ) is provided. 22. A tubular bag according to claim 21, characterized in that weld seams ( 7 , 8 ) are provided on both edges ( 5 , 6 ) running parallel to the longitudinal seam ( 2 ). 23. A tubular bag machine according to claim 21 or claim 22, characterized in that a side fold ( 10 , 11 ) is provided in at least one edge weld ( 7 , 8 ), the amount of the width of the side fold ( 10 , 11 ) being at least the amount corresponds to half the width of the weld seam ( 7 , 8 ). 24. A tubular bag machine according to claim 21, claim 22 or claim 23, characterized in that an additional film strip ( 12 , 13 ) is welded to at least one weld seam ( 7 , 8 ). 25. tubular bag with a longitudinal seam and perpendicular to the longitudinal seam and parallel to one another, transverse sealing seams closing the tubular bag on the head side, and with a side fold, characterized in that on both edges parallel to the longitudinal seam ( 102 ) edges ( 105 , 106 ) of the side fold ( 110 , 111 ) of the tubular bag ( 101 ) each have a weld seam ( 107 , 108 ) and that a weld seam ( 107 ) is designed as a longitudinal seam ( 102 ). 26. A tubular bag according to claim 25, characterized in that the two edges ( 105 , 106 ) of a side fold ( 110 , 111 ) with a weld seam ( 107 , 108 ) on two side folds ( 110 , 111 ) running parallel to the longitudinal seam ( 102 ). are provided. 27. A tubular bag according to claim 25 or claim 26, characterized in that the tubular bag ( 101 ) is designed as a stand-up pouch with a stand-up base ( 109 ).