DE1457232A1 - Carrying bag made of thermoplastic plastic film, as well as process and device for their production - Google Patents

Description

"Carrying bag made of thermoplastic plastic film as well as process and apparatus for making it "The invention relates to a carrier bag as well as Method and device for their production, the carrier bag made of thermoplastic There is plastic and each side of the carrier bag is present on the upper edge of the bag assigned grip hole is provided. The two carrier bag sides are in the The area of the grip flats is reinforced by a one-piece layer of film and the free Edge of the reinforcement is with the associated carrier bag wall on the whole or partially welded length.

It has already been proposed, starting from a gusseted tube, cut open the side folds at their fold line and with the associated carrier bag wall to be welded over the whole or part of the length. Such a carrier bag is thus Reinforced by the side folds in the area of the handle. This reinforcement however, it is only reasonably sufficient if a comparatively thick one Foil is used for the carrier bag. This thick film then affects the area of the upper grip hole looks favorable, but is naohv part in the rest and larger Bag area, because it is unnecessarily thick and therefore wasteful of material.

For making carrier bags from a double gusseted tube to go out, with the gusset after being cut open as a grip edge reinforcement serves and the other gusset forms the bottom of the bag is also disadvantageous, because the winding of the hose into a roll from which the carrier bags takes up a lot of space. A double gusseted tube namely consists of four superimposed layers, namely the lower hose wall, the upper tube wall and the two layers in between for the side folds. It follows that on conventional rolls with a diameter of about 50 cm only a small length of hose can be wound up. This short hose length on a supply roll requires replacement after a comparatively short time a used film roll against a new film roll. This replacement requires and not just that constant readiness of an operator on the film processing machine, but also a lot of time. The disgusting a role usually takes 10 to 15 minutes.

Provided for the production of carrier bags with a grip edge reinforcement of the type described above is assumed to be a double gusset sly, then in practice it is only possible to print on one side of the hose both sides of the hose are printed, then the hose would have to be rotated 180 ° in the printing machine be turned. Attempts in this direction have already been made and it has already been achieved to print a tube on both sides. As a result the short dwell time of a hose run through a printing machine, which must also be turned around to get the smart top on existing printing machines and to print the Schluachumterseite, but leaves in practice with the aforementioned Try only a two-color print because of the aforementioned dwell time of the hose in the printing machine for a drying of four colors is too hrs.

Furthermore, if vo'j one is double. Page. corrugated tube run out becomes difficult, even printing only one sole blank side, because through the side folds the tube side to be printed is not completely flat. Printed the area of the hose between the side folds can also only be used in practice. A soft one is still necessary Counter support to the uneven Approximately equalize the surface of the tube to be printed as a result of the side folds.

The invention is based on the object of addressing these aforementioned disadvantages to be eliminated when manufacturing carrier bags from thermoplastic plastic film. A carrier bag made of thermoplastic material is used to solve this problem with one on the upper edge of the bag, on each side of the bag assigned handle hole, the two carrier bag sides in the area of the handle holes are reinforced by a film layer and the free edges of the film layer with the Carrying bag wall are welded, proposed according to the invention that the upper Edge of each carrier bag side. three and more, in particular consists of three layers of film, which are integral with the wall of the carrier bag and with envelopes, especially inside.

According to the proposal according to the invention, there is thus the e carrying bag in their upper area and in the area of the punch hole punched out on each side three or more layers of film that are integral with the carrying day wall. These three slide. @ layers on each side of the carrying case give a grip edge reinforcement, According to a further inventive feature, a carrier bag consists of double Foil layers and the upper carrying surface narrow edge of each side of the carrier bag consists of four film layers obtained by an envelope, which in particular after are turned inside.

It has been shown that with a carrier bag made of a double layer of film the carrier bag is stronger and more resistant than just a layer of film that has the same thickness as the sum of the two layers of film.

In order to produce the carrier bags according to the invention, in particular can also accommodate a large length of film on a supply roll, which then becomes carrier bags is processed, the carrying bag continues to be on two sides in a simple manner to be printed on, even with a four-color print that was previously practically unattainable, it is proposed according to a further inventive feature that starting of a flat film, the two longitudinal edges of the film are folded inwards, then the edges of the folded wheels continuously with the film wall welded, then the flat film folded over in its central longitudinal axis, then in the stowed the edges of the hose, which is open on one side, the punched holes attached and then the transverse welds with the separation of the finished Carrying bags made from the hose. This pre-determined procedure will Applied in the same way, provided that not from a flaah film, but after a Another feature according to the invention assumed a flat tube will This flat tube then leads to a double-walled carrying bag and a reinforcement of the upper edge of the handle from at least one side of each carrier bag assigned four layers of film.

The proposal for the production of carrier bags from a flat film In contrast to the previous suggestion, starting with a double one Remove the side gusset tube. go, on a supply roll four times the length of Winding up the foil materialo This reduces the changeover times by four times and saved considerable downtime of the device, The proposal of starting from a flat film or from a flat tube, i. e. a hose, which has no gussets can also achieve that in the finished carrier bag Both sides are printed, although the flat film or the flat tube is only on printed on one side This printing on the only necessary one Page now allows four-color printing in practice.

The proposal according to the invention, more appropriate from a flat film Starting from a width or from a flat tube also allows that even the later one The bottom of the bag can be printed because the bottom of the bag is printed is attached to the flat, single-layer film or a single-layer film.

According to a further inventive feature it is proposed that starting with a flat sheet, fold the edges twice. This will result in the later received carrier bag in the area of the upper edge of the carrier bag or the punched grip hole on each side of the carrier bag received a triple layer of film. However, if a single hose is assumed, it is usually no need to fold the edge twice. Usually a simple one is used here Turning over, although double turning is within the scope of the invention and in can be beneficial in certain cases. A double turn would thus be im The punched-out grip hole area on each side of the carrier bag results in six layers of film in the case of double layers of film for the remaining areas of the carrier bag.

The suggestion to start from a flat hose or from one Flaoh foil, allow it, carrier bags with a handle. reinforcement without bottom fold or optionally with a bottom fold.

A device according to the invention for producing the above-described The carrier bag is characterized by a fold * line to turn the longitudinal edges of the flat tube or the flat film and a possibly at it. Closing further folding device for further turning over the through the first envelope already reinforced edges, on it afterward a device that acts preferably on both sides of the reinforced tube edges for longitudinal welding, then the arrangement of a folding triangle with downstream Take-off rollers, followed by a film swivel, a bottom folding device and a grip hole punching device g as well as welding and separating device for cross welding and separating the carrier bags from the hose.

According to the invention, the folding device consists of a Width of the flat film or the flat tube extending horizontally or in the essential horizontally extending sheet metal part of a width that of the folded Width of the flat film or the flat tube corresponds, and one in the direction to the incoming film upwards, preferably at an angle of about 50 to 80 ° angled sheet metal part, the side edges of the sheet metal part angled upwards converging towards the incoming foil, and at the top of the horizontally or essentially horizontally aligned sheet metal part Pressure rollers to hold down the inwardly folded edges of the film or hose.

The Langssohweißvorriohtung consists of advantageous according to the invention arranged on each foil or tube edge, on the upper side and also on the lower side the reinforced foil or tube edges are heated under spring pressure White bar, whereby between the little tails the sweat - @@ lken and the reinforced foil edges Circumferential bands made from a material that cannot be welded at the temperatures used Plastic, in particular made of the material Teflon, are present.

The bottom gusset consists of a hose from the open side introduced plate, the end of which protruding into the tube is a longitudinal one Has dovetail-shaped recess and wherein a horizontally extending RoDe the closed tube edge into the dovetail @ shaped recess to form the bottom fold.

The invention is shown in the drawing with the aid of some exemplary embodiments explained. It is not restricted to the embodiments shown, rather, further modifications within the scope of the invention are possible. It 1 shows a front view of a carrier bag, and FIG. 2 shows a vertical section through the carrying bag according to FIG. 1, according to the line II - II, FIG vertical section through the Tragetasahe according to Fig. 1 according to the line there III - III, Fig. 4 a vertical cream section through a carrying case with double Tragetasohenwandung and upper grip edge on each side of the bag made of i @ overall four layers of film, 5 shows the device essentially schematically for the production of carrier bags, starting from a flat film or a flat one Tube, FIG. 6 shows a section through the flat film which has been folded over twice at the edges corresponding to the line e VI-VI according to FIG. 5o, FIG. 7 shows a section through the one-sided open hose with floor flat and double-folded hose edge in the area the punch hole punch J corresponding to the line VII-VII according to FIG. 5.

The Tragetasohenwandungen 11 and 12 are through the weld 13 and 14 connected to each other. The carrying case also has a base that extends through the Gussets 15 and 16 is formed.

The upper edge of the carrier bag is reinforced in the area of the handle hole 17. According to the invention, the handle edge reinforcement consists of each side of the carrier bag three or more film layers, the three film layers 11, 18, 19 made of the same material exist, are one-piece and have been preserved through the cover.

The punch hole 17 can consist of a full punch, The three or more layers of film on each side of the carrier bag are advantageous at the same time with the punched grip hole welded together by a 2o saw. These Swelling at the cutting line is obtained by a glow band Cutting knife.

The Grifflochauatanzung can, as in Fig. 1 in dashed lines is shown to be closed to form a ring. The grip hole is advantageously punched out but from a flat cut part 21, at the end of which each up and Connect semi-circular cuts 22 and 23 towards the inside.

A corresponding assumption is made for the manufacture of the carrier bags wide flat film 24, which is up into a roll. unwinds on an unwinder stand is rotatably mounted. The flat film is guided over a roller 26 and under it a folding device 27, which consists of one extending over the width of the film horizontally or essentially horizontally extending sheet metal part 28 of a width, which corresponds to the umgeschlau genen width of the flat film and one piece on it connected, in the direction of the incoming film upwards, preferably in one Angle of about 50 to 80 unwound sheet metal part 29, the side edges 30, 31 of the upwardly angled sheet metal part 29 in the direction of the incoming film converge. Behind the folding device 27 is at the same level as the essentially horizontally extending sheet metal part 28 is a deflecting roller 32 available.

As a result, the folding device, as can be seen from the drawing, the lands of the flat film turned inwards because in the area of the kink of the Sheet 27, consisting of sheet metal parts 28 and 29, a relaxation of the film takes place.

To prevent the folded edges from turning back, are on of the folding device is assigned to each edge. press roll 33 and 34 available, which are located on axes 35 and 36 ». are stored, with these axes are pivotable about a parallel axis 37, which is connected via a bracket 38 the top of the sheet metal part 28 is mounted. The pressure rollers 33 and 34 are pressed against the folded edges of the flat film by spring pressure.

Following this first folding device 27 there is one in the same Formed folding device 39 available. Through this folding arrangement 39 basically the same structure as the previously described folding device 27, however a smaller width, the folded by the folding device 27 Edges turned over again.

6 shows the film web after it has left the second folding device 39 with the double-folded edges, namely the first on each side of the tube Envelope 4o and the second envelope 41, which corresponds to the envelopes 18 and 19 according to FIG. 2 correspond to the payment.

One with folded edges in the manner described above The flat film then goes into the long welding device. This exists each film edge from an upper sealing bar 42 and a lower sealing bar 43, which e under the pressure of springs 44 to the associated reinforced edges of the Foil web are pressed on from above and below.

These welding bars are heated by known electrical heating devices, which are housed within the white bars. Between the white areas the sealing bars 42 and 43 and the film are each provided with Teflon tapes 45 and 46, respectively. These two Teflon baths each run over pulleys 47 and 48 or 49 and 50 with the film web 24 with. The welding bars 42 and 43 are therefore not directly to the folded film edges to be welded, but between reinforced ones There is a Teflon tape running along the edges and the sealing bar.

The flat film then passes over guide rollers 51 and 52 a folding triangle 53. This folding triangle 53 folds the flat film 24 in its center line around, so that a tube is formed, but on one side, namely on the Side of the edge reinforcements, is open. By the folding triangle shown in FIG the direction of movement of the flat track is angled. It should be understood that too Other folding devices can be provided that just bend the direction of movement cause the continuous flat web 24 and in the same way as the folding triangle 53 fold the wide flat web 24 in its center around the central longitudinal axis and At the same time, lay the resulting hose horizontally again so that the through the folds 4o and 41 folded edges are now in contact with one another takes place in the manner as can be seen from FIG.

Behind the folding triangle there are still continuous take-off rollers 54 and 55 is present and then the tube, which is open on one side, passes through a Foil oscillator 56, which has the task of compensating for movements, and the hose always to be kept tight, especially with regard to the attachment of the punched holes and transverse welds, which will be described later.

A bottom folding device is available in connection with the aviary angle, which consists of a plate inserted into the tube from the open side 58, the end of which protruding into the hose is a longitudinal, dovetail-shaped Has recess 59, and wherein a horizontally extending roller 6o the closed Hose edge into the dovetail-shaped recess 59 of the plate 58 to form the bottom fold 15, 16 inserts.

There is also a spring clip 61 arranged in the hose, the one The closed hose edge is guided after inserting the bottom fold the punch holes 17 are punched out, through one of the contour of the handle hole correspondingly curved heated band 62, which is supported by a correspondingly shaped Slot 61 of a plate 64 engages.

The upper hose wall is in the area of reinforcement by a another plate 65 held at a smaller distance from the lower Schlauohwandung, so that by attaching the punched-out grip holes, this is done immediately with the welding of the foil layers that form the reinforcement, no welding at the cutting line the lower film layers with the upper film layers takes place.

The transverse welds 13, 14 then take place with an intermediate one Trennsohnitt 66 so that the tote bag is ready.

It should be noted that the bottom folding device is also behind the handle hole punching device may be appropriate.

Expectations :

Claims (10)

P a t e n t a n s p r ü c h e: 1. Carrying bag made of thermoplastic Plastic with one on the upper carrier bag wheels, each carrier bag wall assigned handle hole, the two carrier bag walls in the area of the handle holes are reinforced by a film layer and the free edges of the film layer with the The wall of the carrier bag is welded so that it is not that the upper edge of the carrier bag of each carrier bag side (11, or 12) consists of three and more, in particular three film layers (11, or 12 and 18, 19) are made in one piece with the wall of the carrier bag and by envelopes, especially inwards are. 20 carrier bag according to claim 1, d a d u r a h g e n nz e i c h n e t that the double layer of film and the upper edge of the carrier bag of each Carrying bag wall made of four film layers obtained by an envelope, in particular exists inside. 3. A method for producing carrier bags according to claim 1, d a It is indicated that, starting from a flat film (24), the both longitudinal edges of the foil turned inwards, then the edges of the. folded edges continuously welded to the film wall, -then the flat film is folded over in its central longitudinal tube, then in the reinforced tube edges the one-sided open hose the Grifflo ¢ house punchings (17) attached and then the transverse welds (13, 14) with the separation of the finished carrier bags (lo) is made from the hose open on one side. 4. A method for producing carrier bags according to claim 1, d a d u r a h g e k e n nn n n e i c h n e t that starting from a flat tube knocked the two longitudinal edges of the tube inwards, then the edges of the folded wheels are continuously welded to the film wall, then the tube is folded in its central longitudinal axis and then in the reinforced one The hose edges of the hose, which is open on one side, @ Bracht and the transverse weld (13, 14) with the separation of the finished carrier bags is carried out by the hose open on one side. 5. The method according to claim 3, d a d u r c h g e k e n nz e i a h n e t that the longitudinal edges of the flak film are turned inwards twice, then the double edge wrap is continuously welded to the film wall, then the flat film is folded along its central longitudinal axis and along the reinforced edges of the hose, which is then open on one side, the grip hole punchings (17) are attached and the transverse weld (13, 14) with the separation of the finished carrier bag from the hose is open on one side. 6. The method according to claims 3 to 5, d a d u r c h g e k e n n z e i c h ne t that before or after making the punched handle holes (17) the bottom folds (15, 16) are inserted on the closed edge of the hose. 7. Apparatus for carrying out the method according to the claims 3 to 6, g e k e n n n z e i c h n e t, by a folding device (27) for turning over the longitudinal edges of the flat tube or the flat film and one if necessary, n subsequent folding device (27) for further turning the edges already reinforced by the first envelope, followed by a preferably engaging device on both sides of the reinforced tube edges (42, 43) for longitudinal welding, then the arrangement of a folded @ triangle (53) with downstream take-off rollers (54, 55), followed by a film sender (56), a bottom folding device (57) and a grip hole punching device (62, 63), as well as welding and cutting device for cross welding (1), 14) and cutting (66) the carrier bags from the hose. 8, device according to claim 7, d u r e h g e n nz e i c h n e t, that the folding device (27) consists of one extending over the width of the flat film (24) or the flat hose extending horizontally or essentially horizontally Sheet metal part (28) of a width that corresponds to the folded width of the flat film or the Flat hose and an in Direction oncoming Slide up, preferably angled at an angle ... of about 50 to 80 ° Sheet metal part (29), the side edges (3o, 31) of the sheet metal part angled upwards (29) converge towards the incoming film, and at the top of the horizontally or essentially horizontally aligned sheet metal part (28) pressure rollers (33, 34) for holding down the inwardly folded film or tube edges are arranged. 9. Apparatus according to claim 7, d a d u r c h g e k e n nz e i e h n e; t that the longitudinal welding device consists of at the top and bottom the reinforced edges of the film or hose are heated under spring pressure Welding bars a (42, 43), between the welding surfaces of the welding bars and of the reinforced foil edges circumferential bands made at the temperatures used non-weldable plastic are present. 10. The device according to claim 7, d a d u r c h g e k e n nz e i c h n e t that the bottom folding device (57) consists of one of the open hose side introduced plate (58), the end of which protruding into the hose has a longitudinal, has sohwalbenschwanzformige recess (59) and wherein a horizontally extending Roll (60) the hose edge into the dovetail-shaped recess to form the Insert bottom folds (15, 16).