EP0258573B1 - Portable packing bag made of plastic sheet and process for making it - Google Patents

Abstract

The portable packing bag (1) has an approximately rectangular front and rear surface part (9, 10) in each case which are connected laterally by side parts and in the top region by a folding lid part (4), the latter being provided with raised edges and there being a lower-lying trough (4') formed around a small part of the overall height of the packing bag. Provided in the top region of the packing bag (1) is a handle (2) which consists of two essentially identical parts (14, 15), the ends (3, 3') of which parts are attached to the opposite insides of the raised edges (8) of the trough (4') formed by the folding lid part (4). The handle parts (14, 15) can be connected along a seam (16) at the apex of the U to form a bar. The seam (16) may also be formed as a peel-off adhesive region. <IMAGE>

Description

• der an seinem unteren Ende zunächst offen und nach dem Befüllen verschließbar ist und in gefülltem Zustand eine Quaderform annimmt,
• der je einen angenähert rechteckigen Vorder- und Hinterflächenteil aufweist, die durch Seitenteile seitlich und durch ein Falzdeckelteil im Kopfbereich verbunden sind, wobei das Faltdeckelteil mit hochgezogenen Rändern versehen ist und eine um einen geringen Teil der Gesamthöhe des Verpackungsbeutels tieferliegende Mulde ausbildet,
• und der einen Griff aufweist, dessen Enden im Kopfbereich des Verpackungsbeutels entlang den oberen Rändern der Flächenteile befestigt sind.

Weiterhin betrifft die Erfindung ein Verfahren zur Herstellung des mit den Merkmalen gemäß der Erfindung ausgebildeten tragbaren Verpackungsbeutels.The invention relates to a portable packaging bag made of plastic film, in particular for accommodating flexible and / or folded products, such as cellulose diaper pants,

• which is initially open at its lower end and can be closed after filling and assumes a cuboid shape when filled,
• which each have an approximately rectangular front and rear surface part, which are connected laterally by side parts and by a folding lid part in the head area, the folding lid part being provided with raised edges and forming a recess which is lower by a small part of the total height of the packaging bag,
• and which has a handle, the ends of which are fastened in the head region of the packaging bag along the upper edges of the surface parts.

The invention further relates to a method for producing the portable packaging bag formed with the features according to the invention.

From DE-A 33 21341 is a carrier bag made of thermoplastic material with a front and a rear, essentially rectangular section and an arranged between the sections, with these One-piece bottom fold and a handle welded to the bottom end are known, the other end of the bag for inserting objects is open therein and the filled bag has approximately the shape of a cuboid, in which the handle is designed as a loop and with a strip at each end is provided, the length of which corresponds to the width of the sections. Each strip is welded to one of the sections near the respective outer boundary of the fold on the outside of the bag. In the known carrier bag, the externally welded molded parts made of plastic film overlap the upper edge of the carrier bag in a width of several centimeters on the outer sides of the front and rear sections forming the bag. Approximately half of these overlaps have a weld seam that connects the handle parts to the actual bag. In this way, an approximately 2 cm wide, frill-like protrusion made of plastic film, lying loosely against the upper area of the front and rear section, seen from the handle, results below this weld seam.

It is disadvantageous here that the external weld seam and the material strip fastened by it limit the height of the field available for receiving an imprint on the outside of the bag. Furthermore, during transport and stacking, dirt particles can accumulate in the spaces above and below the weld seam between the outer strips and the outside of the bag underneath and adversely affect the aesthetic impression of the packaging. Finally, when such a package is pulled out of a stack, the entire length of the excess projection can be set up and opposed to the pulling-out undesired resistance which can even lead to the handle being torn off. Another disadvantage is that the transverse dimensions of the handle, ie a width transverse to Bag, is always limited to a width that corresponds to the width of the bottom mentioned. It should also be borne in mind that in all cases it is not favorable to specify a closed handle.

The invention is therefore based on the object of specifying a portable packaging bag which is further developed and improved compared to the known carrier bag in that it has no material protrusions on the outside in the area between the actual carrier bag and the attached grip tapes and thus the deficiencies or Imperfections are overcome and eliminated. In addition, it should be structurally possible to increase the transverse dimension of the handle if desired. Furthermore, an alternative handle design, which is advantageous for some applications, is to be achieved using the structural conditions, namely the two-part handle design.

The problem is solved in a portable packaging bag made of plastic film of the type mentioned above in that the handle consists of two essentially identical parts, the ends of which are attached to the opposite inner sides of the raised edges of the recess formed by the folded lid part.

The terms "top", "bottom", "vertical", "head part" and the like chosen in the claims and in the following description are based on a filled bag, which is placed in the carrying position and which is usually used individually.

It is a great advantage that the handle ends no longer on the outer sides of the surface parts forming the bag, but on the one formed by the folding lid part Trough are sealed, a transition between these parts is surprisingly achieved without any excess material. Thus, the front and rear surface part of the bag can be used to hold a print in full, no dirt particles can still nest in the externally visible area. Furthermore, the bag can be pulled out of a stack in all directions without obstacles.

In this connection, reference is made to a carrier bag according to US Pat. No. 4,252,269, in which a carrier loop is welded directly onto a gusset which is formed in the folded lid part itself. This embodiment is abandoned. It is disadvantageous in the known embodiment according to US Pat. No. 4,252,269 that the bag cannot be reused after opening and removing the contents and that the connection between the handle and the actual carrying bag proves to be extremely weak. In any case, the handle tore out at both ends if the contents were heavier. Another disadvantage of this known carrier bag is that, although it is stackable and lying on one of its two wide surfaces, it cannot be grasped without a certain effort if only one hand is free. The handle opening is relatively small, so that access requires a certain degree of accuracy. On the other hand, when the handle is horizontal, it is unfavorable insofar as it is not possible to securely grasp the filled carrying bag in passing and to take it off the stack or pull it away in one go.

In further embodiments, the two handle parts are to be regarded as independent elements. They can be completely disconnected, leaving it up to the user to combine the two parts through the handle recesses. The packaging bag can thus have a shape similar to that known from shopping bags. The handle recess can be designed differently. It is also possible to manufacture the handle parts from a relatively stiff plastic material, so that they spring upwards practically in the unloaded state and their use lends itself to itself.

It is also possible to easily detach the two handle parts, in particular by means of a peel adhesive connection. In this case, it is possible to easily separate the two handle parts from one another, but also to glue them back together if desired.

The separate execution of the two handle parts is particularly favorable because the two handle parts are manufactured separately in the course of manufacture and can only be joined together shortly before delivery or after filling.

The separate production or the easy detachability of the two handle parts from one another has the particular advantage that a tearable line of weakness, which runs parallel to the longitudinal edges in the middle of the folded lid, tears open by pulling the handle parts in the opposite direction and releases the inside of the bag. It also has the advantage that the top of the folded lid part is more accessible. This advantage is further exploited in accordance with the invention in that a folding lid part is provided with a pull-out tongue which is surrounded by a perforation or another weakening line or which is glued to the folding lid part in such a way that an opening lies underneath which is in turn made accessible by tearing open the pull-out tongue .

The aim of the aforementioned measures is therefore to facilitate opening and making the bag accessible without reducing the wearing comfort.

Further configurations of the bag according to the invention are provided in accordance with the features of further subclaims.

• Auslegen einer laufenden Folienbahn für den Verpackungsbeutel, mit der Außenseite nach oben
• Zuführen von zwei Griffstreifen parallel zur Folienbahn in Abständen zu deren Mittellinie (y-y), vorzugsweise über separate Folienabläufe
• Herstellen von parallelen Schweißnähten zwischen Griffstreifen und Folienbahn,
• Falten der Folienbahn zur Form eines Halbschlauches mit außenliegenden Griffstreifen, unter Bildung einer Schlaufe
• Einstülpen des Mittelteils zwischen den Griffstreifen zur Ausbildung eines Falzdeckelteils und Flächenteilen mit Hilfe einer Innenfalte mit einer Innenknicklinie und zwei Außenknicklinien, wobei die Schweißnähte der Griffstreifen an die Innenseiten der Falte im Bereich der oberen Faltränder nahe in parallelem Abstand neben den Außenknicklinien zu liegen kommen und somit die Griffstreifen etwa in der Ebene der Flächenteile liegen
• Ausführung der Schweißnähte an den vertikalen Rändern der Seitenteile, diese zu einem Schlauch verbindend,
• Ablängen der bearbeiteten Folienbahn mit den Griffstreifen in Einzelstücke von jeweils einer für einen Beutel erforderlichen Stücklänge.

A method for producing the portable packaging bag embodied with features of the invention is characterized by a sequence of working steps as follows:

• Lay out a running film web for the packaging bag, with the outside facing up
• Feeding two grip strips parallel to the film web at intervals from its center line (yy), preferably via separate film drains
• Production of parallel weld seams between the grip strip and the film web,
• Folding the film web into the shape of a half tube with outside grip strips, forming a loop
• Invert the middle part between the grip strips to form a folding lid part and surface parts with the help of an inner fold with an inner fold line and two outer fold lines, the weld seams of the grip strips coming close to the inner folds in the area of the upper fold edges near the outer fold lines and at a parallel distance the grip strips lie approximately in the plane of the surface parts
• Execution of the weld seams on the vertical edges of the side parts, connecting them to a tube,
• Cutting the processed film web with the grip strips into individual pieces each of a piece length required for a bag.

An advantageous embodiment of the method provides, as a further process step before the film web is cut to length, that the two grip strips are welded at their outer edges and that, if necessary, grip recesses and the recesses for forming the side contours are punched out on the grip strips.

Double-layer film material is advantageously used for the main parts of the bag, the outside having a thin-film film which is particularly suitable for applying a color print as the outside film and the inside having a film quality with comparatively very good welding and strength properties.

• Figur 1 einen fertiggestellten Verpackungsbeutel, in perspektivischer Ansicht,
• Figur 2 eine andere Griffausführung des Verpackungsbeutels gemäß Figur 1;
• Figur 3 eine andere Falzdeckelausführung eines Verpackungsbeutels;
• Figur 4 einen ersten Arbeitsschritt zur Herstellung eines Beutels, mit einer ausgelegten endlosen Folienbahn und Zuführen der beiden Griffstreifen über separate, ebenfalls endlose Folienstränge, in perspektivischer Ansicht;
• Figur 5 die Folienbahn mit den Griffstreifen im Schnitt;
• Figur 6 den Zustand eines weiteren Arbeitsschrittes durch Falten der Folienbahn zur Form eines Halbschlauches, in Ansicht von den Schmalseiten her,
• Figur 7 den Zustand nach einem weiteren Arbeitsschritt durch Einstülpen des Mittelteils, ebenfalls in Ansicht von den Schmalseiten her,
• Figur 8 den Zustand nach einem weiteren Arbeitsschritt durch Verschweißung der beiden Griffstreifen, ebenfalls in Ansicht von den Schmalseiten her,
• Figur 9 den Zustand nach einem weiteren Arbeitsschritt, d. h. Ausstanzen der Griffausnehmung und der bogenförmigen Ausnehmungen der Seitenkonturen an den Griffstreifen, in teilweiser Draufsicht auf die Vorderseite des Beutels.

The invention is shown in schematic drawings in several preferred embodiments, further details of the invention and in particular the manufacturing method according to the invention being apparent from the drawing. The figures show in detail:

• FIG. 1 shows a finished packaging bag, in a perspective view,
• Figure 2 shows another handle design of the packaging bag according to Figure 1;
• Figure 3 shows another folding lid design of a packaging bag;
• FIG. 4 shows a first working step for producing a bag, with an endless film web laid out and feeding the two grip strips over separate, also endless film strands, in a perspective view;
• Figure 5 shows the film web with the grip strips in section;
• FIG. 6 shows the state of a further work step by folding the film web into the shape of a half tube, viewed from the narrow sides,
• Figure 7 shows the state after a further step by turning the middle part, also in view from the narrow sides,
• FIG. 8 shows the state after a further working step by welding the two grip strips, likewise in a view from the narrow sides,
• Figure 9 shows the state after a further step, ie punching out the handle recess and the arcuate recesses of the side contours on the handle strips, in partial plan view of the front of the bag.

A portable, filled packaging bag 1 made of plastic film is shown in FIG. 1. The bag 1 has a cuboid shape, this shape can also be given a more or less pronounced cushion shape by bulges, curves and the like, which is essentially determined by its content. The bag 1 has a rectangular front and rear surface part 9 or 10, which are connected by side parts 42, 43. Vertical seams 20, 21 run through the side parts 42, 43, a tubular shape being formed by heat sealing, adhesive bonding or similar known types of connection. Furthermore, the parts 9, 10, 42, 43 are integrally connected to one another by a folding lid part 4 at the upper head region. At the lower, initially open, filling end 34, the bag 1 is closed after machine filling, as is known per se, by a transverse adhesive or weld seam 35.

The folding lid part 4 is provided with raised edges 7, 8 and forms a recess 4 'which is lower by a small part of the total height of the packaging bag. A handle 2, which is designed as a U-bracket, extends over the folding lid part 4. The two ends 3 and 3 'of the handle 2 are in the head region of the bag 1 along the upper, raised edges 8 of the surface parts 9, 10 on their opposite sides, that is, on the raised edges of the trough 4 'formed by the folded lid part 4', attached. Each of the two surface parts 9 and 10 has at the carrying end an inside, with a sealing seam 11, 12 connected handle end 3, 3 'with a handle recess 13.

The handle 2 consists of two identical handle parts 14, 15, which at their outer edges parallel to the axis x - x of the handle recess 13, i. H. in the apex of the U, are firmly connected to each other to form a bracket along a seam 16. The handle ends 3, 3 'are on the cover part 4, namely on the inner sides 5, 6 in the region of the upper edges 8, which are formed between a respective surface part 9, 10 and the folded-in folded cover part 4, by means of heat-sealed seams 11, 12 . They are therefore not on the outside of the side parts 9 or 10, but inside on the upper region of the folding lid part 4 and thus opposite to the trough 4 formed by the folding lid 4 '. This results in the region of the raised edges 8 on the transverse sides of the bag 1, a smooth transition from the surface parts 9, 10 to the handle 2 without excess material.

Furthermore, the surface parts 38, 39 of the handle parts 14, 15 projecting outward from the handle recess 13 on both sides, each with a preferably arcuate recess 18, 19 in the direction of the vertical edges of the surface parts 9, 10 into narrow tongues 22, 23 discontinued.

Furthermore, it is provided in the illustrated embodiment that the part 4 is provided with a tearable weakening line 25 running along the central inner fold 24 or in other areas. This can preferably be formed by a perforation. The Seam 16 can also be designed as a peel-stick area. The two handle parts can thus be detached from one another. Due to the detachability of the two handle parts 3 and 3 ', these can be gripped and pulled apart in the opposite direction. This pulling apart exerts a pull on the weakening line 25, which tears it and thus makes the inside of the bag easily accessible.

The handle consists of two substantially identical handle parts 3, 3 ', which form two overlapping handle part tabs 50, 51 in the apex of the U's. The handle part lobes 50, 51 are connected to one another in an overlapping manner, a peel adhesive area in the form of a strip being inserted between the outer edges of the handle part lobes. The adhesive area extends over the entire length of the handle 2. Peel adhesive strips, peel foils and similar easily detachable plastic surface combinations are known per se. The person skilled in the art can specify various solutions here which enable the two handle parts or handle part tabs 50, 51 to be easily detached. Foil can also be underlaid with a protective strip, so that the two handle flaps 50, 51 are initially simply placed on one another without gluing and are glued to one another only when the customer removes them. The adhesive strip is also designed so that frequent reclosing and reconnection of the two handle parts 3, 3 is possible.

The adhesive areas can be provided as single or multiple strips in corrugated or dotted form. The term "adhesive area" is intended to cover all possible embodiments.

The handle ends 3, 3 'are on the cover part 4, namely on the inner sides 5, 6 in the region of the upper edges 8, between each of a surface part 9, 10 and after folded folding lid part 4 are formed, welded by means of heat-sealed seams 11, 12. The surface portions 38, 39 of the handle portions 3, 3 'projecting from the handle recess 13 on both sides run out with an arcuate extension 18, 19 in the direction of the vertical edges of the surface portions 9, 10 in narrow tongues 22, 23.

Figure 2 shows the upper part of a carrier bag with another embodiment of the handle area. Here, the two handle parts 14, 15 are not connected to each other, but stand up like a handle on a shopping bag. To carry the bag, the two handle parts 14, 15 are pulled against one another and gripped together by the handle recesses 13. This embodiment can also be described below. Easy to make process. This embodiment has the advantage that the top of the folding lid part 4 is easily accessible. This in turn leads to a further embodiment, which is shown in detail in FIG. 3.

According to FIG. 3, the folding lid part 4 has a larger tear-open tongue 61 which can be pulled upwards in the form of a tab fastened on one side. The contour of the tear-open tongue 61 is surrounded by a line of weakness 62. The tear-open tongue itself can be gripped, for example, by a corresponding punch cut in the area of the apex 63. Since the folding lid part 4 is accessible through practically its entire surface through the two unconnected handle parts 2 ', 3', in contrast to embodiments in which a U-shaped handle is present, tear-open tongues according to FIG. 3 can easily be provided.

Instead of a tear-open tongue, a tear-open area can also be provided, as is the case with other pack shapes, is provided for example for handkerchief boxes.

The plastic film web 26 used for the front surface part 9, the folding lid part 4 and the rear surface part 10 is made of a preferably two-layer composite film with a thin film film particularly suitable for applying a color print as the outer film and a comparatively good, supporting inner film having sweat and strength properties, e.g. B. made of a polyethylene film layer. The use of such multilayer composite films, which is known per se, gives the advantageous possibility of making a selection from different materials, each with properties which are particularly adapted to their intended use. The outer layer can be opaque and, for example, can be provided with a print on its outer surface. The inner layer can be transparent or opalescent and equipped with greater strength than the outer layer of the composite film.

It is also provided that the handle parts 3, 3 'are made of a clear, single-layer plastic film of comparatively high tear strength.

Figures 4 to 9 show in detail the steps of the manufacturing process and thus show the emergence of the packaging bag designed according to the invention.

According to FIGS. 4 and 5, an “endless” film web 26 is first rolled off a roll (not shown) and pulled over a machine table. At the same time, two grip strips 36, 37 are laid out and placed parallel to the film web 26 at intervals from their center line y - y, preferably also via separate endless film runs 27, 28. Continuous production takes place simultaneously with these first work steps the parallel heat seal welds 11 and 12.

FIG. 5 shows a view from the narrow side or in section of the position and arrangement of the film web 26 and the grip strips 36, 37 and the weld seams 11 and 12 connecting them together.

Now, as a further step, the film web 26 is folded into the shape of a half-tube with outside grip strips 36, 37, as shown in FIG. 6. This results in a loop 33 in the apex area of the semi-tubular film. Then, in a further continuous or discontinuous mechanical work step, the middle part between the side parts 9 and 10 is turned inwards and thus the folded cover part 4 is formed between the grip strips 36, 37. This results in a pronounced inner fold 24 with an inner fold line 29 and two outer fold lines 30 and 31. The seams 11, 12 of the grip strips 36, 37 are pressed against the inner sides 5, 6 of the fold 24 in the area of the upper outer fold lines 30, 31 in a tight, folded parallel distance to it. Thus, the grip strips 36, 37 come to lie on the inside of the folding cover part 4 approximately in a plane parallel to the two surface parts 9, 10.

In a further step, the vertical weld seams 20, 21 are placed on the vertical edges 40, 41 and the side parts 42, 43, whereby the parts of the film lying on top of one another are connected to form a tube.

In a subsequent step (FIGS. 7 to 9), the two grip strips 36, 37 are connected at their outer edges by a surface sealing seam 16 and the grip recess at the same time or subsequently 13 and the arcuate recesses 18, 19 are punched out to form the side contours on the grip strips 36, 37, so that the grip 2 results. The processed web is then cut into lengths required for individual packs.

In the described embodiment of the bag (cf. FIG. 2), as an alternative to the previously described work step, the two grip strips 36, 37 can be placed one on top of the other, a peel-adhesive area being printed at the location of the seam 16 before being placed on top of one another. Simultaneously or subsequently, the handle recess 13 and the arcuate recesses 18, 19 are punched out to form the side contours on the handle strips 36, 37, so that the handle parts 3 and 4 result. The processed web is then cut into lengths required for individual packs.

It is of course readily possible to omit the seam 16, so that two separate, non-connected handle parts 14, 15 are created. It is also possible to cover the peel adhesive strip with a protective film, so that there is initially no connection between the grip strips 36, 37 in the area of the seam 16.

Then the known filling of the bags takes place after inflating and filling the contents. Subsequently, the bottom part 32 is closed by a transverse surface sealing seam 35.

The sequence of work steps mentioned is very advantageously suitable for the largely continuous and online production of the packaging bags 1 described. The production takes place at comparatively low production costs and on conventional production facilities or machines.

Claims (10)

1. Portable packing bag (1) made of plastic film, in particular for holding flexible and/or folded products, such as disposable nappy pants,

- which is initially open at its lower end (34) and can be closed after filling, and takes on a cuboid shape in the filled state,

- which has one approximately rectangular front surface section and rear surface section (9, 10) each which are connected together at the sides by side sections and are connected in the top region by a folded lid section (4), the folded lid section (4) being provided with raised edges and forming a trough (4′) which is deeper by a small proportion of the total height of the packing bag,

- and which has a handle (2), the ends (3, 3′) of which are fastened along the upper edges of the surface sections in the top region of the packing bag,
characterised in that the handle (2) consists of two substantially identical sections (14, 15), the handle ends (3, 3′) of which are attached to the opposing inner sides of the raised edges (8) of the trough (4′) formed by the folded lid section (4).

2. Packing bag according to Claim 1, characterised in that the handle sections (14, 15) are joined along a seam (16) in the apex of the U to form a stirrup.

3. Packing bag according to Claim 1, characterised in that the two handle sections (14, 15) are not connected together, or are connected together so as to be readily detachable, above the folded lid section (4).

4. Packing bag according to Claim 1, characterised in that the two handle sections (14, 15) are connected or can be connected together by means of a seam (16) which is designed as a peel-stick area.

5. Packing bag according to Claim 1 or 4, characterised in that the folded lid section (4) is provided with a tearable line of weakness (25) which runs in the middle of the folded lid section (4) parallel to the longitudinal edges (8).

6. Packing bag according to Claims 1 to 4, characterised in that the folded lid section is provided with a pull tab (61) which is surrounded by a line of weakness (62) or an adhesive strip.

7. Packing bag according to at least one of the preceding Claims, characterised in that the surfaces of the handle sections (14, 15) which project outwards from a handle recess (13) on both sides with one preferably arcuate recess (18, 19) each are designed opening out into narrow tongues (22, 23) towards the vertical edges of the surface sections (9, 10).

8. Packing bag according to one of the preceding Claims, characterised in that the handle (2) is made of a transparent plastic film of comparatively high tear strength.

9. Process for producing portable packing bags according to Claim 1, characterised by the following process steps:

- laying out a continuous film web (26) for the packing bag (1), with the outside on top,

- supplying two handle strips (36, 37) parallel to the film web (26) spaced apart from the centre line (y-y) thereof, preferably via separate film outlets (27, 28),

- producing parallel bonded seams (11, 12) between handle strips (36, 37) and the film web (26),

- folding the film web (26) into the form of a half-tube with the handle strips (36, 37) lying on the outside, forming a loop (33),

- folding in the middle section between the handle strips (36, 37) to form a folded lid section (4) and surface sections (9, 10) with the aid of an inner fold (24) with an inner fold line (29) and two outer fold lines (30, 31), with the bonded seams (11, 12) of the handle strips (36, 37) coming to lie on the insides (5, 6) of the fold (24) in the region of the upper fold edges (7 and 8) close and at a parallel distance next to the outer fold lines (30, 31) and the handle strips (36, 37) thus lying approximately in the plane of the surface sections (9, 10),

- forming the bonded seams (20, 21) on the vertical edges (40, 41) of the surface sections (9, 10), joining them into a tube,

- cutting the film web (26) with the handle strips into individual pieces each of a piece length required for one bag (1).

10. Process according to Claim 9, characterised in that the following is inserted as a further process step before the cutting into lengths of the film web (26):

- bonding of the two handle strips (36, 37) on their outer edges, optionally cutting out the handle recess (13) and the recesses (18, 19) for forming the side contours on the handle strips (36, 37).

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