EP0929455B1 - Process for producing a combination packaging beaker - Google Patents

Abstract

This invention concerns a process for producing a cup-shaped combination packing container (16) which consists of an inner cup-shaped plastic pan (1) which tapers inward moving downward and an outer casing-like plastic part (12) which lies adjacent to and surrounds the inner cup-shaped plastic part (1). The casing-like outer part (12) is pushed over the finished extruded cup-shaped plastic inner part (1) and subsequently affixed to it, which improves the rigidity of the completed container and simplifies production and logistics. Moreover, a combination packing container is disclosed which has a plastic inner part with a recess (19, 19') which stands back inwardly for receiving additional objects (20) between the plastic inner part and the outer part pushed over it

Description

TECHNICAL AREA

The present invention relates to the field of Packagings. It relates to a method for producing a cup-shaped Combination packaging container, which is an internal one cup-shaped, downward tapering plastic inner part and a surrounding the plastic inner part, adjacent, jacket-like outer part includes.

Combination packaging containers of the type mentioned are from earlier Patents of the applicant, EP-B1-0 102 522 or EP-B1-0 408 515, known.

STATE OF THE ART

Stackable combination packaging containers, in which a cup-shaped, usually deep-drawn plastic inner part from a film from an outer part made of a different material, e.g.

Paper, cardboard or other plastic, coated have different advantages: First, through the use of two different materials of the container can be optimally adapted to the respective application. For example, it is a frozen or hot one Package contents are an advantage, an outer part made of one material to use, which has a thermally insulating effect. On the other hand the use of a separate outer part has the advantage that the outer part is separated from the container with pictures, text, Advertising, instructions for use or the like can be printed, which enables a significantly better print quality. Furthermore, the separation of the container in individual fractions significant advantages in waste disposal (Recycling). Finally, the two-ply Construction of the container increased mechanical strength achieve, especially when transporting in multi-layer Container is an advantage.

These and other advantages have led to combination packaging containers as a yoghurt, ice cream or margarine cup or a large and wider in other comparable applications find increasing distribution.

In the production of the previously known combination packaging containers is the coat-like, usually printed Outside part made. With a jacket made of cardboard material we wound a corresponding blank around a mandrel and glued overlapping the side edges. The The outer part is then in the deep-drawing mold of a plastic deep-drawing device inserted. Then in the outer part deep-drawn the plastic inner part like this is described in the already mentioned EP-B1-0 102 522. The deep-drawn plastic inner part connects to this Form-fitting with the outer part to the finished combination packaging container. Suitable additional configurations the outer part such as a fold of the lower edge (12 in Fig. 1 of EP-B1-0 102 522) or a survey in the form a circumferential groove (16 in Fig. 1 of EP-B1-0 102 522) ensure that the positive connection is stable and is permanent and without a bond between the inside and Outside part gets along. To separate the two parts later lightening, additional separating elements like the one in the Desired separation strips in the outer part described in EP-B1-0 408 515 be provided.

The known manufacturing method for Combined packaging container has, although in practice has proven very successful, but also has some disadvantages: direct positive connection from the plastic inner part and the printed, matched to the later container content The outer part of the deep-drawing process is the finished container set for later use. Should therefore for example at a manufacturer of various yoghurt products those necessary for continuous production differently printed yoghurt cups available at the warehouse this requires a considerable amount of space, because the molded cups are stored separately according to species Need to become. Will the cups be in a different place produced and transported to the filling location also increase the transport costs.

Another major disadvantage of the known method lies in the complexity of the machines used. Instead of a simple deep-drawing device in which the cup-shaped Container made from a film by deep drawing specially made for the known process, expensive and complicated machine sets needed, which in a first station, the outer parts made of printed blanks shape and glue the finished outer parts over a transfer station precisely in the special deep-drawing molds use a special deep-drawing device, and the Thermoforming device finally the plastic inner parts in deep-draw the outer parts.

Another disadvantage of the known method is that achievable axial crush resistance of the finished container. The container usually has - as in Fig. 1 of EP-B1-0 408 515 can be seen - to improve stackability a circumferential paragraph serving as a support shoulder (3 in Fig. 1 of EP-B1-0 408 515). The sales are as a result of the manufacturing process equally in the outer part as well as in the molded plastic inner part. By the sales result despite the inherently stiffening composite structure of the container a weakening of the container wall against axial, i.e. attacking perpendicular to the bottom of the container Compressive forces because the container wall in the area of Paragraph tends to buckle. Such weakening of the container against axial upsetting forces is especially then undesirable if the filled and closed containers on a pallet or the like directly in several layers one above the other to be stacked.

In addition, DE 295 13 093 U discloses a method according to the preamble of claim 1.

PRESENTATION OF THE INVENTION

The object of the present invention is a Process for producing a plastic inner part and shell-like outer part of existing combination packaging container specify which avoids the aforementioned disadvantages and simplification of the production devices, one Reduction of transport and storage costs for the finished Container, and improved stiffness of the container allows in the axial direction.

The task is characterized by the entirety of the features of the claim 1 solved. The essence of the invention is exterior part and separate plastic inner part or form and then both parts together to connect by placing the outer part over the inner part pushed and fixed on the inner part. To this Way it is possible with simple deep-drawing devices To produce non-specific, cup-shaped plastic inner parts, only afterwards if necessary with the corresponding printed or otherwise assembled outer parts be connected to the finished combination container. This will the flexibility in manufacturing increases and warehousing and transportation significantly simplified. At the same time it opens up the possibility that the plastic inner parts directly at Filler of the containers on simplified machines in-line manufactured and then with those in stock specific external parts.

Basically, it is conceivable to use the outer and inner part for education of the combination container to glue together. hereby however, the later separation of the two parts would be made more difficult. In addition, additional adhesive stations would be needed in which the gluing process is carried out. According to the invention The process therefore becomes a cup-shaped one Plastic inner part used, which includes latching means, in which the jacket-like outer part for fixing to the cup-shaped The plastic inner part snaps into place. this has the advantage that the finished combi container by a simple Nesting the two parts can be obtained and that the outer part later very easily separated from the inner part can be e.g. the printed inside of the outer part to read, or around the different types of materials of the container for separate disposal or reprocessing separate from each other.

The method according to the invention is further characterized by this that the locking means one in the bottom area of the cup-shaped plastic inner part arranged circumferential Grip shoulder whose outside diameter is larger than the inside diameter of the lower edge of the jacket-like outer part, that the jacket-like outer part when pushed over over the cup-shaped plastic inner part with its lower edge is pushed so far over the circumferential shoulder that it engages behind the shoulder, that the engaging means still an upper, outwardly projecting edge on the cup-shaped Include plastic inner part, and that the jacket-like Outer part when sliding over the cup-shaped Plastic inner part with its top edge from below pushes the edge and after snapping between the edge and the circumferential shoulder is held. That way achieved a particularly simple fixation of the outer part. At the same time, the jacket-like outer part can be weakened Take up axial compressive forces applied to the container.

The jacket-like outer part can be in different ways getting produced. In a first alternative embodiment is used to manufacture the jacket-like outer part a blank wrapped in a coat, and the side edges are glued together in an overlap area. The outer part can in this way without further measures be pushed over the plastic inner part.

In a second alternative embodiment, the manufacturing cut along the jacket-like outer part two fold lines folded, and the side edges are in glued together in an overlap area. The glued The outer part then lies in a flattened form in front. It can be stacked and transported easily and space-saving and stored. If necessary, the flattened External parts are then stretched tubular and over the Plastic inner part pushed.

The plastic inner part is characterized in that it cup-shaped and tapering towards the bottom, and that locking means are provided on the plastic inner part are in which the jacket-like outer part for fixing on cup-shaped plastic inner part can be detachably engaged.

In particular, it is characterized in that the latching means one arranged in the bottom area of the plastic inner part encircle the shoulder, the outside diameter is larger than the diameter of the lower edge of the jacket-like Outside part, and that the locking means continue to be one upper, outwardly projecting rim on the cup-shaped Plastic inner part, in particular in the form of a sealing flange, include, against which edge the jacket-like outer part when sliding over the cup-shaped plastic inner part with its upper edge.

In a particularly preferred embodiment Improve the stackability in the bottom area of the cup-shaped Plastic inner parts a circumferential, inwardly projecting Paragraph provided. The circulating paragraph forms the upper limit of a circumferential retreat, which is bounded at the bottom by the circumferential shoulder. At the same time, the evasion will initiate Upsetting forces in the jacket-like outer part are relieved.

Further refinements of the method result from the dependent claims.

BRIEF EXPLANATION OF THE FIGURES

Fig. 1

in teilweise geschnittener Ansicht ein bevorzugtes Ausführungsbeispiel für ein erfindungsgemässes Kunststoffinnenteil;

Fig. 2

in teilweise geschnittener Ansicht ein bevorzugtes Ausführungsbeispiel für ein Aussenteil, welches mit einem Kunststoffinnenteil gemäss Fig. 1 gemäss dem Verfahren nach der Erfindung zu einem Kombi-Verpackungsbehälter verbunden werden kann;

Fig. 3

in teilweise geschnittener Ansicht einen fertigen Kombi-Verpackungsbehälter, wie er sich aus den Teilen gemäss Fig. 1 und 2 ergibt;

Fig. 4

in teilweise geschnittener Ansicht einen Stapel mit zwei Behältern der in Fig. 3 dargestellten Art,

Fig. 5

einen vergrösserten Ausschnitt aus Fig. 4;

Fig. 6, 7

in der Draufsicht zwei verschiedene, flach gefaltete und fertig verklebte Aussenteile mit Aufreisshilfen (Grifflappen, Perforation) für den Einsatz im erfindungsgemässen Verfahren; und

Fig. 8

ein Aussenteil gemäss Fig. 6 oder 7 beim Drüberschieben über ein Kunststoffinnenteil gemäss Fig. 1;

The invention will be explained in more detail below on the basis of exemplary embodiments in connection with the drawing.
Show it

Fig. 1

in a partially sectioned view a preferred embodiment for an inventive plastic inner part;

Fig. 2

in a partially sectioned view a preferred embodiment for an outer part which can be connected to a plastic inner part according to FIG. 1 according to the method according to the invention to form a combination packaging container;

Fig. 3

in a partially sectioned view of a finished combination packaging container as it results from the parts according to FIGS. 1 and 2;

Fig. 4

in a partially sectioned view a stack with two containers of the type shown in Fig. 3,

Fig. 5

an enlarged section of Fig. 4;

6, 7

in plan view two different, flat-folded and fully glued outer parts with tear-open aids (grip tabs, perforation) for use in the method according to the invention; and

Fig. 8

an outer part according to FIG. 6 or 7 when pushed over a plastic inner part according to FIG. 1;

WAYS OF CARRYING OUT THE INVENTION

Fig. 1 shows a partially sectioned representation a plastic inner part, as it is for the inventive Method is suitable. The figure half to the left of the dash-dotted center line shows the longitudinal section, the right half of the figure is an uncut side view. The cup-shaped plastic inner part 1 is shown in the Example simply conical with a Bottom 9 tapering diameter. It becomes explicit pointed out that the simple conical cup is only one Embodiment represents, and that within the scope of the invention Of course, other stackable shapes such as four, six or otherwise polygonal or mixed square round Shapes are conceivable.

The conical wall 2 of the cup-shaped plastic inner part 1 is in the example shown at the top by a sealing flange 3 limited, by means of which the cup is closed can be. This can be done, for example, by sealing an aluminum foil. But there are also others Edge shapes conceivable, such as in the left Half of Fig. 1 from EP-B1-0 102 522 are reproduced. The wall 2 of the cup is from the upper edge or sealing flange 3 starting, down to the floor area without Heel trained throughout. Only directly in the floor area a circumferential rear pull 5 is provided, the top through an inwardly projecting, circumferential paragraph 4 is limited, its function later in connection with Fig. 4 and 5 will be explained in more detail. Towards floor 9 is the rear pull 5 by an outwardly projecting, encircling shoulder 8 which delimits directly into the ground 9 merges and forms an annular bead. The Evasion 5 itself is divided into two rear sections 6 and 7, of which the upper rear section 6 is substantially cylindrical, and the lower rear section 7 easily is designed to open towards the bottom.

This configuration of the floor area has several essentials Advantages: On the one hand, paragraph 4 becomes a support shoulder provided the defined nesting of the cups allows. On the other hand, with the rear pull 5 "Spring base" realized, i.e. the floor 9 can become when it occurs move axial compressive forces in the axial direction. This property is for the rigidity of the combi container of importance, which will be discussed in more detail below becomes. Finally, the geometry of the Behind that the plastic inner part 1 without the Use of complex sliding molds to be deep-drawn can if a plastic material with increased shrinkage behavior such as. Polypropylene (PP) is used because of the deep-drawn cups despite the drawdown 5 due to the Take shrinkage out of a solid deep-drawing mold without any problems leaves.

The bottom 9 of the plastic inner part 1 can be different be trained. Regarding the possibilities here referred to EP-B1-0 102 522. In the present example the 1, the bottom 9 has an outer contact surface 11, which surrounds a central retracted base part 10 in a ring shape.

According to the method according to the invention, first a Plastic inner part 1 of the type shown in Fig. 1 by Thermoforming from a plastic film or another suitable Manufacturing process manufactured. The finished mug then with a jacket-like outer part 12, as shown by way of example in FIG. 2, into one Combined packaging container connected by the outer part 12 like a cuff from below over the cup-shaped plastic inner part 1 is pushed and fixed to the inner part. This has the particular advantage that only the one to be packed Product coordinated, product-specific printed External parts that fold easily and save space have to be kept in stock while the (non-specific) Plastic inner parts directly at the Bottler or elsewhere on simple deep-drawing devices manufactured and then with the outer part be united.

The jacket-like outer part 12 can be made of different materials exist and manufactured in different ways his. With regard to the possibilities, see EP-B1-0 102 522 and EP-B1-0 408 515. The outer part becomes 12-what is often the case - from a blank from the outside and / or inside printed cardboard material, so the blank, for example, wrapped in a sheath on a mandrel and then the side edges in an overlap area 13 glued together. Of course you can for the outer part 12 for better separation of the plastic inner part 1 also a predetermined dividing strip with grip tabs and corresponding Perforation lines are provided as shown in EP-B1-0 408 515 is described.

The fixation of the jacket-like outer part 12 on the cup-shaped Plastic inner part 1 is preferably made by a releasable snap. As a snap on the plastic inner part 1 the upper edge or the sealing flange work 3 and the circumferential shoulder 8 with the one above Hinterzug 5. The outer diameter of the shoulder 8 is (slightly) larger than the inside diameter of the bottom edge 15. The height of the outer part 12 in the axial direction is somewhat less than the (axial) distance between the bottom of the Sealing flange 3 and the shoulder 8.

To form the combination packaging container 16 or 19 ', such as he is shown in Fig. 3 and in Fig. 5 in an enlarged The cladding-like outer part 12 can be seen 2 as far as the plastic inner part 1 according to Fig. 1 pushed until it with the upper edge 14 on the bottom of the sealing flange 3 At the same time the glides Lower edge 15 of the outer part 12 over the shoulder 8, the yields resiliently due to material and geometry and their Outside diameter reduced. Simultaneously with the toasting the upper edge 14 on the sealing flange is the lower edge 15 slid over shoulder 8 and has it again released so that the shoulder 8 in its starting position jumps back into place. The jacket-like outer part 12 is so between the sealing flange 3 and the shoulder 8 on the Plastic inner part 1 detachably fixed.

At the same time, the upper edge 14 is through the sealing flange 3 and the lower edge 15 covered by the shoulder 8 protectively. This is advantageous if, for example, a jacket-like one Outer part 12 made of moisture-sensitive cardboard material to be used. It is also possible to Protection of the edges to provide a fold, as this is from the EP-B1-0 102 522 is known. Depending on the design of the coat-like Outer part 12 compared to the cup-shaped plastic inner part 1 can be a more or less tight fit of the External part 12 can be reached on the inner part.

As can be seen from Fig. 2, the outer part 12 has a largely smooth outer surface without debilitating paragraphs or Like. For this reason, the outer part 12 is in the Able to absorb relatively large axial pressure forces. Corresponding can the outer part 12 in the finished combination packaging container Catch 16 axial compressive forces on the floor 9 and act the sealing flange 3 of the plastic inner part. A The "spring base" already mentioned above plays an important role in this. If axial pressure is applied to the plastic inner part 1 of the combination packaging container 16, shifts the bottom 9 resiliently towards the sealing flange 3 until the shoulder 8 on the lower edge 15 of the jacket-shaped outer part 12 presses. Pushes the outer part 12 at the same time its upper edge 14 to the sealing flange 3, the axial Pressure largely introduced into the jacket-shaped outer part 12 and caught there. This way the stiffness of the combination packaging container 16 compared to the previously known containers significantly increased, so that the filled Containers in several without additional aids Layers can be stacked on top of each other.

The function of the circumferential paragraph 4 when stacking several combination packaging containers 16, 16 'is from the 4 and 5 clearly. The parts of the second combination packaging container 16 'are with the same reference numerals - however in a deleted form - provided like the corresponding Parts of the first combination packaging container 16. At Stacking the containers 16 and 16 'together is supported upper second container 16 ', which is also a jacket-like outer part 12 ', a cup-like plastic inner part 1', rear sections 6 ', 7', a shoulder 8 ', a footprint 11 ', a shoulder 4' and a retracted bottom part 10 ' comprises, with its contact surface 11 'on the paragraph 4 of the first container 16. The inwardly projecting paragraph 4 or 4 'ensures that an outer part 12 or 12' with smooth outer surface can be used. The stack height, i.e. the increase in height by stacking two Containers 16, 16 'depends largely on the height of the rear pull 5 from. The height of the rear pull 5 and thus also the stack height increases, increases at paragraph 4, 4 ' the inside diameter. This makes it possible to include the outside diameter the shoulder 8, 8 '. The shoulder 8, 8 'is then further over the lower edge 15 of the engaged Outside part 12, 12 'in front, whereby the locking function and Protection of the lower edge 15 can be improved.

It has already been mentioned above that this is for manufacturing a corresponding cut to the outer part 12, 12 ' wrapped in a coat, and the side edges in one Overlap area 13 are glued together. The emerging tubular outer part is direct in this way ready to slide over the plastic inner part 1, 1 '. In other cases, however, it is desirable for space-saving Storage and transportation of the outer parts in flattened form To have form in the present. This is achieved if - how 6 and 7 can be seen - for the production of the jacket-like Outer part 12 is a cut along two fold lines 24, 25 or 26, 27 folded and the side edges in one Overlap area 13 are glued together. The Fold lines 24, 25 and 26, 27 can expediently embossed into the material during the production of the blank become.

6 and 7 are at the overlap area 13 of the outer part 12 additional tear aids are provided. A grip tab located at the top of the overlap area 17 can be pulled down by hand to do this To separate outer part 12 at overlap area 13. The Splitting is facilitated by the fact that the overlap area 13 bounded on one side by a perforation 18 which is also in the making of the blank in the material can be introduced. In the example in FIG. 6 one of the fold lines (24) also forms the other boundary line of the overlap area 13 and acts similarly like a perforation and supports the tearing process. in the In contrast to the example in FIG. 7, the overlap region 13 is located in the middle between the fold lines 26, 27. According to FIG. 8 are the outer parts 12 of FIG. 6 or 7 in the same Pushed from the bottom 9 over the plastic inner part 1, as already described above. differences arise only insofar as the flat folded 6 and 7 before sliding over the plastic inner part 1 is first stretched tubular Need to become.

Basically, for the present combination packaging container all materials and dimensions are used already in the publications EP-B1-0 102 522 and EP-B1-0 408,515. It is particularly preferred that plastic inner part 1 or 1 'by deep drawing from a To produce PP film, and for the outer part 12 or 12 'cuts made of printed cardboard material with or without predetermined separation strips to use. If the outer part 12 or 12 ' Made from a plastic, it is for a simplified Processing advantageous to use the same material as for the plastic inner part 1, 1 '.

NAME LIST

1,1 '

Plastic inner part (cup-shaped)

2

wall

3

sealing flange

4,4 '

Paragraph (all round)

5

Evasion (all around)

6,6 ', 7,7'

Behind tension section

8,8 '

Shoulder (all around)

9

ground

10.10 '

retracted bottom part

11.11 '

Footprint (all around)

12.12 '

Outer part (jacket-like)

13

overlapping region

14

Upper edge (outer part)

15

Lower edge (outer part)

16.16 '

Combined packaging containers

17

gripping tab

18

perforation

24, .., 27

fold line

Claims (8)

1. Process for producing a combination packaging beaker (16, 16'), which has an internal beaker-shaped plastics inner part (1, 1') tapering towards the bottom and an external sleeve-type outer part (12, 12') surrounding and abutting with the plastics inner part (1, 1'), the sleeve-type outer part (12, 12') being pushed onto the ready-moulded beaker-shaped plastics inner part (1, 1') and then fixed to the beaker-shaped plastics inner part (1, 1'), wherein the beaker-shaped plastics inner part (1, 1') used has locating means (3, 8) in which the sleeve-type outer part (12, 12') releasably locates so as to fix it to the beaker-shaped plastics inner part (1, 1), which locating means comprise a top, outwardly projecting ridge on the beaker-shaped plastics inner part (1, 1') so that when the sleeve-type outer part (12, 12') is pushed up over the beaker-shaped plastics inner part (1, 1') its top edge (14) hits the ridge from underneath, characterised in that the locating means further comprise a circumferentially disposed shoulder (8, 8') in the base region of the beaker-shaped plastics inner part (1, 1'), the external diameter of which is bigger than the internal diameter of the bottom edge (15) of the sleeve-type outer part (12), and when the sleeve-type outer part (12, 12') is pushed up over the beaker-shaped plastics inner part (1, 1') its bottom edge (15) is pushed far enough past the peripheral shoulder (8, 8') to locate behind the shoulder (8, 8') and once located, the outer part (12, 12') is retained between the edge and the peripheral shoulder (8, 8').
2. Process as claimed in claim 1, characterised in that the top edge of the beaker-shaped plastics inner part (1, 1') is provided in the form of a sealing flange (3).
3. Process as claimed in one of claims 1 or 2, characterised in that a sleeve-type outer part (12, 12') is used, which is made from a plastics material, in particular a plastics film of the same material as the plastics inner part (1, 1').
4. Process as claimed in one of claims 1 or 2, characterised in that a sleeve-type outer part (12, 12') is used, which is essentially made from paper or board material.
5. Process as claimed in one of claims 3 or 4, characterised in that the sleeve-type outer part (12, 12') has print applied to the external and/or internal face.
6. Process as claimed in one of claims 1 to 5, characterised in that the sleeve-type outer part (12, 12') is made by winding a cutting to form a sleeve and bonding the side edges to one another in an overlap region (13).
7. Process as claimed in one of claims 1 to 5, characterised in that the sleeve-type outer part (12, 12') is made by folding a cutting along two fold lines (24, 25 or 26, 27) and bonding the side edges to one another in an overlap region (13).
8. Process as claimed in claim 7, characterised in that one of the fold lines (24) simultaneously forms a boundary line of the overlap region (13) and the overlap region is bounded by a perforation (18) at the other side.

Images