DE2841416A1 - Prismatic container for liq. goods - has upper sealed roll, adhered at central section only, but forming continuous joint - Google Patents

Abstract

The container consists of synthetic-coated cardboard, forming an integral blank, and has a rectangular base and flat sides. The container top is sealed by inwardly folding side flaps, which are integral extensions of the side walls. The upper edges of all side flaps are heat sealed and form a projecting roll, which is folded and fastened to one of the flaps. The roll engages on the flap (6) on chosen areas of the relative surfaces. A central section (12) of the roll engages on the flap to a lesser degree than the remaining sections. The central section is within the outer edge of the roll, to give a continuous seal along that edge.

Description

Prism-shaped container from

plastic-coated cardboard.

The invention relates to a prism-shaped container made of plastic-coated Cardboard formed from a one-piece folded cardboard blank and has a rectangular bottom and a substantially flat side surface.

The container is sealed at the top in that Closure flaps, which represent extensions of the side walls and in one piece the side edges are connected to each other, are curved, with two opposite Closing flap between the two other closing flaps in a position below the other closure flaps are folded in while they are also folded by folding of inclined Fold lines are doubled; thus the others lie Closing flap on top of the container; after that the top margins become more all Closing flaps are heat-sealed and thus form a protruding seam lock or Bead, which consists of four layers of the cutting material and then after is bent down on one of the locking claws and attached to its surface; the angle of the inclined fold lines in the flaps below is chosen so that a container is obtained, the finished top closure of which is essentially lies in a plane perpendicular to the longitudinal axis of the container.

Such "bead" containers or cartons have a very good top seal and are therefore good for liquid products such as milk, juice, water, etc. suitable, but can of course also be used for more viscous products such as yoghurt, jam etc. can be used. The bulge containers are made from rolls of cardboard sheets, those on both sides with a thin layer of a thermoplastic material are coated, whereby the web is printed, for the production of weakened Bending lines are provided with breaks and punched out to form the blanks will. The blanks are glued together in the form of a drum by means of the plastic coating and delivered to the producer of the content in a flattened state; this judges the Open the container and seal the bottom by heat sealing; he makes one open container, which is then filled to a certain level. In the end the top of the container is closed by folding. Well-known containers will be mostly with the formation of a "gable roof" with sloping roof surfaces and one middle protruding seam bar that is heated and clamped between two Sealing jaws is heat-sealed, closed. However, it is also known to be the Bend lines to be produced in such a way that the tabs that the "Roof areas" form, do not form a substantial angle with each other after folding; through this a substantially flat top is created when the bead on a the top flap is folded down and attached to its surface will.

When the container is to be opened to gain access to the contents obtained, the two upper flaps are folded back at one end of the bead and the heat seal of the bead torn about half its length, after which the underlying closure flap of this bead end is unfolded and together with the adjacent areas of the upper closure flaps a pouring spout that is suitable for pouring liquid products. When the top is to be opened by tearing the bead, the bead must be from its folded Standing upright. This applies at least to the part of the bead to be torn open.

In the manufacture of such containers it is not easy to find a sufficient one To achieve control over the adhesion of the bead to the uppermost closure flap, to prevent it from accidentally coming off without it being too difficult or to make arduous to erect the bead. Containers or cartons for milk are made from relatively thick cardboard blanks and the four cardboard layers in the bead make this relatively stiff, since the inherent stiffness of the material creates a relatively large force trying to pull the bead out of its folded position straighten up. Therefore, the use of a hot melt adhesive to attach the Bead not sufficient. A bead that is attached by means of a hot melt adhesive is relatively easy to get up; on the other hand, there is a risk that he himself accidentally releases when handling the container. When the bead by heat-sealing the plastic layer on the bead and on the top surface of the top one Sealing flap is to be attached, it is difficult to control the strength of the weld, because the top gives way when the bead is pressed down.

This problem is less likely to occur at the edges of the container where the Side walls give a certain strength.

It has therefore been proposed to extend the bead so that his top edge is at the edge of the container when the bead is folded down. However, such an extension of the bead is undesirable because it reduces the consumption of cardboard is increased.

The invention is therefore based on the object of providing a container of the to make available the genus mentioned above, in which the bead, which is not higher than usual, folded over onto one of the upper flaps and secure can be attached to it, with the top edges of the container facing his open to form a pouring spout, are well protected. At the same time, consumption should on cardboard are not increased and the bead should be easy to open the container can be straightened up.

This object is achieved according to the invention in that the bead on the closure flap mainly on selected areas of adjacent surfaces of the bead and the uppermost closure flap adheres, with at least one surface of the central portion of the bead has reduced adhesion to the closure tab than the remaining area of the bead.

The area with reduced adhesion should preferably not be up to extend to the outer edge of the bead.

This creates a contiguous one along the outer edge of the bead Sealing preserved.

The desired selective adhesion can be achieved by a heat-activated Paint adhesive can be obtained on one or both adjacent surfaces of the bead and the closure flap is applied, the central surface of the bead and / or the corresponding area on the sealing flap is free of paint adhesive.

Alternatively, the adhesion can be achieved by heat sealing or heat welding the outer plastic layer of the corresponding adjacent surfaces of the bead and the closure flap. In this case, the decreased adhesion in the desired area by applying an adhesive or release agent can be achieved that the plastic coating in the area of one or both Surfaces covered.

A polyamide resin, for example, can be used as a paint adhesive, which is used in Alcohols or aromatics can be dissolved. The paints can contain plasticizers and must have a great affinity for polyethylene, which is preferred as an outer coating is plastic material used on the container.

Other resins such as polyester and melamine resins can also be used will.

If desired, the article of the invention can be used together be with: 1) a stronger embossing of the fold line between the upper edge area (Bead area) and the remainder of the closure flap onto which the bead is folded, 2) heat sealing the bead in an inclined position in which it is against the Closing flap is ajar, and / or 3) additional pressure rails that are not on act on the bead, but only on the locking tabs on both sides of the bead.

The container according to the invention has a bead that is securely in place in the folded position, with the edges of the bead well protected at the same time are. Even so, the seal that holds the bead in its folded position can be easily vomited by touching the flap to which the bead is attached, applies a downward force.

In the following an embodiment of the invention is based on the figures explained in more detail.

Fig. 1 shows the upper part of one provided with crimps or embossments Blank to be set up to form a container according to the invention; Fig. 2 is a vertical section through the top of a finished container according to FIG of the invention with a folded bead.

The fragment of a plastic-coated one with fold lines and punched Cardboard blank 1, which is shown in Fig. 1, forms the upper part of an unsealed one Container. During the production of the container from the blank 1, this is along of the vertical bending lines 2 made by folding, folded and the edge 3 is heat sealed to the opposite edge 3 '. After that, that will not shown lower part folded and heat-sealed in the usual way on a mandrel, so that the blank 1 is formed into an open container with the desired Contents, such as milk, up to fold line 8 between the container part (part B) and the flaps 4, 5, 6 and 7 (part A) can be filled. After filling the one-piece closure flaps are bent along the lines 8, the Closure lobes 5 and 7 are bent under the closure lobes 4 and 6 while they are doubled at the same time along the embossed lines 9, and are along other fold lines 1o folded in the usual way.

The angle of the inclined line 9 is chosen so that the upper closure flaps 4 and 6 and the underlying flaps 5 and 7 essentially in a horizontal position Are in position when the container is sealed and closed.

In addition, as shown in Fig. 2, the bead is down on the flat top surface folded and fastened in this position, creating the top essentially despite the fact that the inherent rigidity of the material tends to erecting the top latch, and particularly the bead, remains flat.

The surfaces of the closure flaps 4, 5, 6 and 7 above the folding or Bending line 1o are given the corresponding reference numbers provided with a dash designated. These areas are heat sealed to one another by means of baking and form the bead or rabbet lock of the container. It is common for the top margins or surfaces 5 'and 7' of the underlying closure flaps 5 and 7 that they have a have upper edge that is slightly from the center to the adjacent edges 4 ' and 6 'drops. It is also customary that the remaining edge parts or surfaces 4 ' and 6 'are approximately the same length and slightly, e.g., 5 to 6 mm, above the top edge the edge areas 5 ', 7' of the closure flaps 5 and 7 protrude. However, at the illustrated blank of the closure flap 6 or, better, its edge area 6 'much shorter than that of the closure flap 4; actually he knows Closing flap 6 has approximately the same length as the flaps 5 and 7. Due to the The fact that the upper edge of the rims 5 'and 7' is beveled becomes another very small step 11 at the junctures between the edge 6 'and the edges 5 'and 7' formed. If this level is to be increased, the drop can or the slope of the upper edge of the edges 5 'and 7' can be made steeper.

Due to the shortening of the closure flaps 6 or, better, their edge areas 6 ', the edge of this closure flap takes a protected position on the underside of the folded bead, the opening of the container to form a pouring spout at the same time is facilitated.

According to the invention, the container can despite the fact that the bead securely adheres in a flattened position, can be opened easily. This is based on the fact that on the central surface 12 of the edge region 4 'of the closure flap 4 and / or on the surface 13 of the closure flap 6, on which the middle surface 12 is folded, an adhesive or release agent is applied. This adhesive, that is applied on top of the outer plastic coating reduces the Adhesive effect obtained when the bead and the top surface of the closure flap 6 are heated and pressed against each other. The adhesive can be sticking of the areas in question completely, or preferably quite a bit generate weak adhesion by pressing down the closure flap 6, such as indicated by the arrow 14 in Fig. 2, can be easily broken. How one can be seen in the figure, the surface 12 preferably does not extend to The outer edge of the closure flap 4 and the surface 13 should also be arranged in such a way that that the outer edge of the closure flap extends beyond the surface 13 also. This will create a good bond along a narrow line along the outside edge of the bead received.

The adhesive can be selected from a large number of substances be. The face 13 lies on the outside of the container (i.e. on the back of the blank according to FIG. 1, in which the cut from the side which later forms the inside of the container). It is therefore beneficial to if the surface 13 is made of a suitable printing ink or printing ink, preferably a bright color, and is applied when the blank is printed. Preferably, however, an adhesive in the form of a known organosiloxane rubber is used used with a high molecular weight, which is predominantly a polymer of dimethylsiloxane with the general formula (CH3) contains 2SiO2. These siloxane rubbers are made by Rochow in "Chemistry of the Silicones" and US Pat. No. 2,448,556.

Corresponding selective adhesion can be achieved by means of a heat-activated Paint adhesive can be achieved in a pattern that is complementary to the pattern of the Abhäsionsmittel is applied, whereby the surfaces 12 and 13 from the paint adhesive remain free. The lacquer adhesive can be applied to exactly the desired areas using a printing process applied in the same way as the complementary adhesive layers. The paint adhesive can be used alone or in combination with an adhesive coating will.

The present invention provides a container for milk and the like Liquid products are available that make it possible, without increased consumption of cardboard, lay the bead flat on the flat upper flap to create a flat To reach top. The bead is firmly glued in the folded position, can however, it can be easily erected when the container is to be opened.

At the same time, the edges that appear after opening the container are the Form a pouring spout, well protected. This makes it obvious hygienic and get aesthetic benefits.

In summary, a container made of plastic-coated cardboard described with a top closure of the "gable type" commonly used on sales containers used for milk; however, the 'roof' is flattened and lies in one plane, which is substantially perpendicular to the longitudinal axis of the container; consequently is the gable disappeared. The protruding sealing bead in the middle part of the roof is folded onto one of the roof surfaces and glued to it. The liability is at least in an area that is in the middle part of the bead, preferably within its outer edge, is arranged, reduced. Although a reliable adhesion of the bead in flat fold Position is obtained, the bead can thereby easily be in a vertical position to open the container to be folded back, and the edges that after opening The container's spout is protected from dirt and other contaminants protected. Blank page

Claims (4)

Claims 1 Prism-shaped container made of plastic-coated Cardboard box, which is formed from a one-piece folded blank and a rectangular one Has bottom and substantially flat side walls, with the container at the top End by folding in flaps that form extensions of the side walls and are integrally sealed along their side edges, two opposite one another Closure flap between the other two closure flaps in a position below the other closure- ..,, - -. - these ~ tr lobes are turned in while / qleicntalis are doubled by folding along inclined fold lines, being the other closure lobes on top of the container, after which the top Edges of all closure flaps are heat sealed and a protruding one Form the bead, which consists of four layers of the blank material and the bead is then folded down onto one of the flaps and onto its surface is attached, the angle of the inclined fold lines in the lower flap is chosen to provide a container with substantially the finished upper surface thereof lies in a plane perpendicular to the longitudinal axis of the container, characterized in that that the bead on the closure flap (6) mainly in selected areas the adjacent surfaces of the bead and the uppermost closure flap adheres, at least one area in the central portion of the bead opposite the remainder of the bead has reduced adhesion to the closure flap. 2. Container according to claim 1, characterized in that the surface (12, 13) with reduced adhesion lies within the outer edge of the bead, whereby a continuous seal is obtained along the outer edge of the bead. 3. Container according to claim 1 or 2, characterized in that the Bead glued to the closure flap by means of a heat-activated lacquer adhesive on one or both of the adjacent surfaces of the bead and the fastener lobe is applied, the middle area of the bead and / or the corresponding The surface of the closure flap is free of paint adhesive. 4. A container according to claim 1 or 2, wherein the bead is thereby attached to the Closure flap is glued that the outer plastic coating of each adjacent surfaces of the bead and closure flap are heat sealed, characterized in that the area of one or both surfaces on which the Adhesion is reduced by a layer of an adhesive or release agent that covering the plastic coating is reduced.