WO1988006092A1

WO1988006092A1 - Process for the manufacture of packs of plastic bags with side seams, said bags forming a block

Info

Publication number: WO1988006092A1
Application number: PCT/EP1988/000106
Authority: WO
Inventors: Hans Reifenhäuser
Original assignee: Stiegler Gmbh Maschinenfabrik
Priority date: 1987-02-14
Filing date: 1988-02-13
Publication date: 1988-08-25
Also published as: DE3704662A1; AU1361588A

Abstract

The packing of bags as a block, and process for the manufacture of packs of plastic bags to form a block, said bags having welded dividing side seams, an approximately sinusoidal carrying edge, pierced handle holes reinforced with strengthening sheets and, on one side of the bag, block-formation sections, detachable by means of a series of perforations which join the bags to the pack and allow them to be torn from it. For manufacture in pairs, a sheet of tubular film (1) is spread flat and cut along its centre, either straight or sinusoidally, to produce the bag, and the two halves of the sheet (1a, 1b) are switched, each being passed to the other's transport track, so that the edges of the opening (11) which had formerly passed only the middle of the transport track now pass along the outer edges; circular sections (6) are cut from the upper layer of the sheet, working from the open upper edge, so that the block-formation sections (9) are formed on the lower layer of the sheet (10b).

Description

description

Process for the production of blocked packs from bags made of plastic film with side seams

The invention relates to a method for producing blocked packs of bags made of plastic film with side separating weld seams, at least partially approximated sinusoidal support edge with grip holes and reinforcing sheets surrounding the latter, which are firmly connected to the plastic film, and to one side of the bag, which can be separated from the bag opening by means of a row of perforations formed blocking section, over which the bags are combined to form the pack and can be torn off, in which a flat tubular film is cut straight or sinusoidally along its center for the pair-wise production of bags, then the reinforcing sheets are intermittently inserted and bonded firmly, then the finger holes are punched and then closed by side welding transverse to the direction of conveyance and separated the bags stacked into packs and the packs are blocked and the hanging holes and di e row of perforations are punched into the blocking section before or after.

The invention further relates to interlocked packs made of plastic film bags produced by the method with a front wall and a rear wall, an at least partially approximately sinusoidal supporting rim,

Side weld seams, punched-in grip holes and the surrounding reinforcing sheets connected to the plastic film and with a blocking section which can be separated above the grip holes via a row of perforations and is formed on the rear wall with at least one Hanging hole through which the bags are connected for packing and can be torn off.

Generic packaging products of the type described above are already in manifold versions on the market, _d arunter ranging tote bags with side seams, thumb hole and glued reinforcement sheet, with straight carrying edge or sinusoidal carrier edge, either in loose packing, see DE-OS 32 22 376 or. blocked to pack according to DE-OS 34 24 748, are formed. Production of bags in pairs by cutting out a strip is described in DE-OS 25 26 014 and DE-AS 19 00 337. The folding over of flat film while leaving a gap for the pair-wise manufacture of bags can be found in DE-GM 79 26 375.

The known packaging products of the type described above have disadvantages both in the manufacturing process and in practical handling. In the case of carrier bags with adhesive sheet reinforcement in particular, these are the use of adhesive for applying the reinforcing sheets for the handle and the partial surface pretreatment of the corresponding side of the film web which is still largely necessary as a result, in order to achieve good adhesion of the adhesive. Both the adhesive and the pre-treatment method are environmentally harmful. The waste cannot be regenerated.

In addition, it is already known in the manufacture of bags with a bottom seam from EP-OS 0136 171 to block them in a region above the grip hole or at the upper opening edge with one side of the bag by placing the counterpart on the side opposite the blocking area is punched out. US Pat. No. 4,562,925 also describes the production of bottom-seam bags in the form of a shirt with side gussets.

The invention has for its object to provide a versatile and economical method for producing side seam bags with grip hole and grip hole reinforcement, - are at least partially formed with a sinusoidal support edge and can be blocked in one layer to pack, so that they can be easily opened and filled on the unblocked front wall.

To achieve this object, the invention teaches in a generic method, .- that the two half-tubes obtained by cutting the tubular film in the middle mutually exchange their conveying paths by deflecting, so that the opening cut edges of the half-tubes previously running in the middle of the conveyor path, which later form the carrying edge , the outer sides of the conveying path are guided along that ^'the obtained by centrally cutting the tubular film web two Halbschläuσhe exchange mutually their conveying paths by deflection, so that the running previously in the center of the conveying path Öffnungssσhnittkanten of the half-tubes forming the subsequent carrying edge, along the outer sides the conveyor track are guided so that the reinforcement sheets are fed from the outside of the conveyor track and welded to the film layers of the half-sleeves from the inside or outside that lie congruently one above the other end film layers are separated from the opening film layer starting from the opening cut edge either in the area of the later bag center or the later bag sides of two successive bag sections in the form of circular sections and thereby the subsequent blocking sections are exposed on the film layer below.

With the same process technology and minor optional additional or omitted steps, the invention enables the production of very differently equipped bags with side seams, which are designed to be torn off to form packs. The process according to the invention offers advantages in terms of both product and process technology compared to known mehodes. These are in particular the environmental friendliness due to the absence of the use of glue and thus also the elimination of surface pretreatment; furthermore the simple handling by applying the i reinforcement sheets from the outside to the au _ß enliegenden in the conveying direction edges of the half tube webs and application of the contact welding, for example with a plurality of point _S chweißflächen the manner of a grid welding. In particular, the invention is characterized by the single-layer blocking in the area of only the back of the bag in connection with the approximately sinusoidal. Design of the support rim with a large filling opening. The blocking can be carried out according to the invention either using the same process technology above the finger hole zone or to the side of the finger hole zone ®. With the method bag can raden with ge ^'or wavy cutting edges are made with sinusoidal edge Trageränd the like starting from a half tube web.

The process technology according to the invention is based in an economical manner on a double-lane production method in which a double-width tubular film - corresponding to the parallel production of two rows of bags at the same time - is used, which can alternatively also be provided with integrated in-line printing. It is of course also possible to carry out the method according to the invention starting from two flat film webs with folding or from two single rolls of tubular or semi-tubular films, optionally pre-printed or with integrable in-line printing. It is also possible to use tubular film with side folds already inserted as later bottom folds and an extruded material-compressed strip for the later wearing area in order to achieve a reinforced wearing zone.

In a further development of the invention, it is provided that after deflection of the half-tubes, the outside straight opening edges or, in the case of sinusoidal outside edges, the inside straight folding edges are aligned by edge control and, in the case of sinusoidal opening edge cuts, are continued offset by half a wavelength, so that the crests and troughs of the two half hoses are guided in parallel. The edge control enables the correct entry, ie parallel guidance and _P ositioning, the half-tubes in the subsequent devices for inserting and welding the reinforcing sheets. When redirecting the

_H a _l bschlauchfolienbahnen is also provided in accordance with the invention that the two film web deflection units for the two half-tubes can be positioned independently of one another, so that the exact position of the bags to be separated later can be controlled, in particular with a sinusoidal opening edge cut, so that the wave troughs and the wave crests run at the same height.

If desired, when the half-tubes continue to run in the direction of the separating welding device, bottom folds are inserted along the fold edges running in the middle of the conveyor path in the continuous flow area of the half-tubes.

This is followed by the discontinuous work area or the processing of the half-tubes into the bags, in which work is carried out intermittently with a progressive advance of the half-tube webs.

The method according to the invention enables, on a receiving traverse, across the two side-by-side grip holes, optionally in a C-cut or kidney, banana. Oval or round shape and the counterpart to be left out of the upper film layer of the half-hoses to the blocking section remaining on the lower film layer and an additional row of perforations for the blocking section running optionally in the lower film layer exactly below the upper film layer and optionally performing these punchings simultaneously. But it is also conceivable

Blocking can also be done like punching holes, hanging holes and tear-off perforation punching the bags in stacked packs.

For bags made of straight film tubes

Opening edge cuts are made and lateral blocking sections and partially sinusoidal Carrier edges are to be obtained, it is provided in a further embodiment of the invention that as counterparts to be cut out for each two blocking sections of a bag, which are arranged on both sides of the finger hole area, _A sections are punched out, each having an arcuate or sinusoidal cutting edge in the center of the later

Have side seam, that is, each extend over the front part of a bag and the rear part of the bag following this. In the event that such a punch is provided, this is done after punching the finger holes. In this embodiment of the bag, it is proposed in a further embodiment of the invention that the blocked packs of bags are punched out in accordance with the desired approximate sinus shape of the carrying edge from the side seams in both upper corners and the hanging holes are punched in the remaining blocking sections ^' on both sides of the center of the bag .

In the case of half-tubular webs cut open in a wave shape, blocking on one side is made possible according to the invention in that the top of the wave crests of the upper film layer is punched out with a straight cut edge.

A particular advantage of the method according to the invention. It can be seen that while the side seams are being welded, the new bags to be separated, which are already stacked neatly on top of the pack, are simultaneously separated by means of a tape or point blocking with the while the side seams are being welded in the area of the blocking section Packs can be welded (blocked). This procedure according to the invention has the advantage that the resulting bag is still held in a more precisely defined position by the separating welding device and thus the blocking position can also be defined and the blocking can be carried out. Since the interlocking section is kept as small as possible for material and waste reasons, precise positioning is required. In addition, the interlocking weld must always be outside of the l Row of tear perforations.

After reaching the desired number of bags per pack, these are assigned to one of the storage devices

_G gripping device detected and connected to a downstream

5 punch position advanced. Here, those die cuts that have not yet been made are made in accordance with the desired ones

Pocket shape, for example the subsequent punching of the Sinsu shape with a two-leg punch for

Carrier bags with two interlocking sections on the side of the

10 reinforcement sheets, as well as the associated hanging holes and, if necessary, tear-off perforations, unless this has already been done in connection with the cut-out of the cutout.

15 With the method according to the invention, in particular, bags with a sinus shape carrying edge can also be produced economically, the method allowing the height of the sinus shape to be variably adjusted by appropriate positioning. This means that not only the upper edge of the bag can be shaped

20 but also the width of the material waste can be determined at the same time.

Various “products” can be produced with the method according to the invention. These are in particular 25 generic packs of blocks made of bags with an approximately sinusoidal carrying edge, in which the one or two blocking sections protruding integrally with the rear wall projecting beyond the front carrying edge have the shape of circular sections.

30

In a preferred embodiment is on both sides of the

\ Gripping hole each a blocking section over a _t- shaped support edge of the front of the bag over. In another version, the are in the side corner area

-, r exposed blocking sections partially stamped out to form an approximately sinusoidal support edge. The method according to the invention and the products according to the invention are explained below by way of example with reference to the drawing. They show a schematic representation

Figure 1 is a perspective view of a blocked pack with Sinusr ndbeuteln

Figure 2 View of a bag with side blocking sections

Figure 3 View of a bag with side

"Blocking sections with recessed corners

FIG. 4 shows a schematic illustration to explain a method for producing blocked packs according to the invention from bags with side seams

FIG. 5 shows a schematic representation of the process sequence for producing bags according to FIGS. 4 and 5.

The interlocked pack 100 according to FIG. 1 contains a plurality of carrying bags 10 with a sinusoidal carrying edge 11. The bag 10 consists of thermoplastic plastic film and has the front wall 10a, the rear wall 10b and the welded side seams 2 produced by separation welding, a bottom folding edge 3 and, if necessary an inserted bottom fold 13. The grip holes 4 are reinforced by reinforcing sheets 5, for example made of plastic film, which surround the grip holes on the inside by welding to the front wall and the rear wall. The front wall 10a has one above the grip hole area 4 by punching one.

Sectional resulting section edge 61. Practically the top of the wave crest has just been cut off. The counterpart to the cut off part of the front 10a forms on the back 10b the blocking section 9, with which the bags 10 are connected in one layer to the pack 100 by spot or tape welding. The interlocking section 9 is parallel to the section edge 61 with the row of perforations 7 provided and along this the bag 10 can be torn from the blocking section 9. For the presentation and use of the pack 100 further hanging holes 8 are provided in Verblockungssabschnitt 9, at least one _A ufhängeloch 8, on which the packing 100 is, for example, suspended from wickets or hooks. The foremost bag 10 can then be filled by easy access on the open edge 61 of the front and opening and after filling from the block along the. Perforation row 7 are deducted. The bags according to Figure 1 can also without

10 reinforcement sheet 5 and instead be formed with an extrusion-thickened support edge. It is also possible to weld the reinforcement sheets 5 to the outside of the bag 10.

15 FIGS. 2 and 3 show further preferred configurations of the bag according to the invention and blocked packing, starting from a bag 10 with an originally straight carrying edge 11. The side seam bag has a grip hole reinforcement in which the reinforcing sheet 5 is preferably flush with the supporting edge

20 11 closes, in contrast to the example of FIG. 1. The blocking section 9 is provided on both sides of the grip hole 4 in the upper corner region of the bag, i.e. there are two interlocking sections and a hanging hole 8 is provided in each interlocking section. To the bag 10 after the

25 Separation from packing to give an approximately sinusoidal carrying edge, is the front 10a of the bag with arcuate cut-out edges 61 in the corner area, which the

Release the blocking section 9 of the rear wall, designed and parallel to the cut-out edge 61, for example the 30 rows of perforations 7 are provided, along which the bag 10 can be separated from the packing and the blocking sections.

«

FIG. 3 shows a further development of the bag 10 according to FIG. 35 2, in which the blocking area 9 is made by punching out the

Corner areas 9a was reduced from the outset. In Figure 3, the bag 10 is shown in a slightly opened function. FIG. 4 schematically shows the process sequence for producing the side seam bag 10 with a sinus support edge 11 according to the example of FIG. 1. For the manufacture of bags in pairs, a flat tubular film 1 for the double-lane production process is assumed. The tubular film 1 fed continuously via the station I is then cut open in the middle at the separating cutting station II, the opening cut edges 11 forming the later carrying edges of the bags. In the exemplary embodiment according to FIG. 4, a sinusoidal separating cut is carried out, as a result of which the two half-tubes 1a, 1b are formed. Since it is particularly necessary to manipulate along the opening cut edges 11 in order to produce the desired bags, it is advantageous to redirect them via two folding stations III in such a way that the previously right half-tubular web la then continues on the left and the previously left half-tubular web lb continues on the right, whereby the Opening cut edges 11 now run along the outer sides of the device and the conveyor track and are thus easily accessible for manipulation. The previously folded edges 3 now run in the middle of the conveyor track. After the deflection, floor folds can be inserted directly in a floor insertion station IV, which is not shown in more detail, at the bottom folding edges. Up to this point, funding has been continuous. The following. ' Station V is used to feed the reinforcement sheets 5, for which purpose di half-tubes are opened from the outside by guide plates, the reinforcement sheets 5 are inserted from the sides and are bonded securely to the upper and lower foil layers of the two half-tubes by contact welding. Depending on the design of the bag, the reinforcing sheet 5 is positioned in the region of the opening cut edge 11.

Next follows a punching station VI, in which, for example, a receiving cross-piece, which extends across the two half-tubes, with the various punching units for

Handle holes and section 6 to be separated from the upper film layer 10a of the half-tubes with circular section shape, in order to expose the blocking section on the lower film layer. In the next station, a receiving crossbeam with punching units can be provided for the row of perforations running on the lower film layer, which delimits the blocking section, and possibly for the hanging holes. The punching units mounted on the receiving traverses are interchangeable and adjustable and can therefore be adapted to different bag designs.

When the method for producing bags with a sinus edge is carried out, only a minimal drop for the blocking edge, measured by the film width, is obtained, since at a sinus height of approx. 80 to 90 mm the blocking section has a width of approx. 25 to 30 mm, which only needs to be considered once for two bags. Real waste in the manufacture of the bags is only the cut-off part of the top film in station VI, which is negligible but can be regenerated. The carrying bag or bag can be hung in blocked packs and is easily accessible and fillable. The height of the sine edge can be varied in the proposed method up to about 110 mm with the same machine equipment.

If bags are to be produced in accordance with the design of FIGS. 2 and 3, the process sequence is varied as shown in FIG. 7. The tubular film 1 is in the station

II cut open straight so that straight opening cut edges

11 are guided on the outside of the conveyor track. In the

Station VI is to punch the grip hole 4 and in the subsequent station Via from the upper film layer 10a

Kreisabsσhni, tt6 punched out with sinusoidal cutting edge 61.

The punch used for this extends over the later side seam and includes the front part and the rear part of the successive bags, the supporting edge or the opening cut edge 11 running straight.

This is followed by station VIII

Jig welding station with the interlocking device is combined. Still during the welding of eitennaht _S 2 is blocked in the area 9, that is, is held while the bag still in precise position by the sealing bar, the resting already on the uppermost packing bag is locked in Verblockungsabschnitt 9 in exact position.

Can the separating welding apparatus Station VIII also includes a tray collecting device for products manufactured by .the separating welding and separated bags 10, wherein the separation welding means are arranged directly downstream of a rotating Nahtkühleihrichtung, for example, rotating ^'rods, in which the still hot welded side seams of the bag are incident and cool individually until they can no longer seal with the bags in the pack. During this cooling phase, the next bag width is already pulled forward by the welding device and placed on the pack and during the next cycle of separation welding, the placed bag is welded to the pack in the blocking area.

After reaching the desired number of bags per pack, the blocked pack is removed from the storage position directly behind the separation welding device. For the formation of the bags or packs according to FIGS. 2 and 3, a punching station for the blocked pack is then provided after the separating welding station VIII, in which at least the hanging hole pair punching in the two lateral blocking areas, the tear-off perforation punching, if not previously done in the via station , and the punching of the sinus corners can be made simultaneously. These punching tools can also be variably adjusted due to their positioning and can therefore be adapted to different bag formats and designs.

Claims

1.SP atent claims 5

1. Method for producing blocked packs from bags made of plastic film with side separating weld seams, at least partially approximating sinusoidal carrying edge

Handle holes and these surrounding reinforcement sheets bonded to the plastic film, and one over the

10 bag opening protruding by means of a perforation row separable on one side of the bag

Blocking section, via which the bags are combined to form the pack and can be torn off from it, in which a flat tubular film lies in pairs along its center

1 ^ Making bags is cut straight or sinusoidally, then the reinforcing sheets are inserted intermittently and firmly connected, then the handle holes are punched and then cut across by welding

Direction of conveyance closed the side seams and the bags 0 separated into packs stacked and the packs are blocked and the suspension holes and the perforation row are punched in the blocking section before or after, characterized in that the by

Cutting the tubular film web (1) obtained two

25 half-tubes (la, lb) mutually through their conveyor tracks

Swap the redirection so that the previously in the middle of the

Opening cut edges (11) of the conveyor track

Half hoses, which form the later carrying edge, along the

Outside of the conveyor track that the

30 reinforcement sheets (5) from the outside of the conveyor and fed to the film layers (10a, 10b)

Half hoses (la, lb) are welded from the inside or outside i, that from the congruent one above the other

Foil layers (10a, 10b) from the overhead foil layer (10a)

35 starting from the opening cut edge either in the area of the later bag center or the later bag sides two successive bag sections (6) in the form of circular sections are separated and the subsequent blocking sections (9) are exposed on the film layer (10b) below.

2. The method according to claim 1, characterized ^" in that in the case of half-tubes with straight opening cut edges, the sections (6) for bags each having two blocking sections (9) which are arranged on the side of the grip hole, each with an arcuate or sinusoidal cut edge in the center be rigged to the later side seam of a bag.

3. The method according to claim 1, characterized in that in the case of sinusoidally cut half-tube webs, the top of the wave crests of the upper film layer (10a) is punched out with a straight cutting edge.

4. The method according to claim 2, characterized in that the blocked packs (100) of bags (10) according to a desired approximate sinus shape of the support edge (11) starting from the side seams punched out in both upper corners and the ... hanging holes (8) are punched into the remaining interlocking sections (9) in the area of the center of the bag.

5. The method according to any one of claims 1 to 4, characterized in that after the deflection of the half-hoses (la, lb), the parallel guidance in the conveying direction and positioning with an outside edge extending edge (11) of the half-hoses scanning edge control and the sinusoidal separation cut Semi-tubular webs are continued offset by half a wavelength, so that the crests and troughs of the two half-tubes are guided synchronously. Λ ς

6. Blocked packs of bags made of plastic film with a front wall and a rear wall, an at least partially approximated sinusoidal supporting edge, side weld seams, punched-in grip holes and surrounding them with the plastic film; connected reinforcement sheets and with a blocking section which can be separated above the grip holes via a row of perforations and is formed on the rear wall and has at least one hanging hole via which the bags are connected for packing and can be torn off, characterized in that the one or more ^' over the front carrying edge (11 ) protruding blocking sections (9) integrally formed with the rear wall have the shape of circular sections.

7. Blocked packing according to claim 6, characterized in that on both sides of the grip hole (4) each a blocking section (9) over an arcuate support edge (11a) protrudes from the front of the bag.

8. Blocked packing according to claim 7, characterized in that in the lateral corner area the exposed blocking sections are partially stamped out to form an approximately sinusoidal support edge.