DE102012104683B4 - Lid and method for its manufacture - Google Patents

Abstract

Lid (1) for containers, in particular lids (1) for packaging containers, the packaging containers being able to represent cups, bowls or the like, the lid (1) being designed as an attachment lid, snap lid, insertion lid or the like having a peripheral edge (3), wherein the lid (1) is deep-drawn from a paper or paper-like material or formed in a modified process, wherein the inner, a flat surface (2) of the peripheral, downwardly directed edge (3) directly or indirectly adjoins, which are slightly conical can and wherein the edge (3) embossing (4), reels, folds or the like, which extend vertically and / or horizontally and act as locking lugs, characterized in that at the transitions between the lid surface (2) and edge (3) embossing (5) are provided.

Description

The invention relates to a lid for containers, in particular covers for packaging containers, wherein the packaging container can represent cups, bowls or the like, wherein the lid is designed as Aufsetzdeckel, snap lid, Einsetzdeckel or the like with a circumferential, preferably downwardly directed edge.

There are various such lid known, which are thermoformed from plastics. Also known are lids, made of paper or cardboard, in which a frame is placed around a lid surface, or which are produced by means of a deep-pressing process, but then especially vertical wrinkling is observed in the edge region, which leads to a non-tight closing lid.

Often, the use of renewable raw materials is now in the foreground, which is why plastic is sometimes to be dispensed with.

The known paper or cardboard covers also have the serious disadvantage that they must be made of several parts. In addition, wrinkling often occurs, which leads to leaks.

From the WO 2012/046 215 A1 is a deep-drawn lid of the type mentioned, which is screwed into a container.

From the EP 0 639 509 A1 a deep-drawn lid is known which has an inside annular projection for locking the lid on a container.

As a result, the lids are not only expensive to manufacture, but also can not close the container tight. In order to ensure sufficient tightness, further, technically complex and, above all, expensive measures must be taken.

The present invention is therefore an object of the invention to provide a lid made of renewable raw materials, which is able to close a container sufficiently tight.

This object is achieved by the features of the five independent claims.

The lid is deep-drawn from a paper or paper-like material or shaped in a modified process. An encircling, downwardly directed edge directly or indirectly adjoins an inner cover surface which may be slightly conical. The edge has embossments, convolutions, folds or the like, which extend vertically and / or horizontally and act as locking lugs.

When thermoforming such a fibrous material, no wrinkles and kinks are generated which would cause leaks. At most defined embossments, which may also be designed as longitudinal knobs are providable. Deep drawing in relation to the present invention refers to any forming process that alters the fibrous material in shape. It is irrelevant whether this is a classic deep-drawing process, in which the material is drawn by negative pressure in a mold, or whether working with overpressure, stamping or the like. Essential is a wrinkle-free and smooth forming.

As a result, the lid can be very easily placed on a container and holds there by clamping. The edge is often referred to as a frame.

By locking lugs the lid is additionally secured.

At the transitions between the cover surface and the dome and / or dome and edge or cover surface and frame / edge embossments are provided, which preferably extend vertically or radially.

These embossments stabilize and enhance the transitions.

According to the invention can be provided directly or indirectly to the inner lid surface an upwardly directed dome, which may be formed circumferentially.

In this way, an improved stability of the lid can be achieved. Also, an inner sealing surface, which is supported on the inside of the walls of the container is conceivable.

According to the invention it has also proved to be very advantageous if the frame or the dome is designed as a stacking aid.

This prevents the stacking of multiple cover that they deform each other. In addition, it is ensured that the lid does not stick together and are so bad destackable. In addition, this stacking aid also acts as a centering aid when stacking several sealed cups. Slipping the cups against each other is thus avoided.

It is also very advantageous according to the invention if portions of the lid are pressed, expanded, folded over and / or rolled.

This positively influences the stability and shape of the lid.

It is also extremely advantageous according to the invention if the lid has a round, oval, angular or rounded shape.

This can be closed any container.

According to the invention it has also proved to be very advantageous if the lid has a height between 5 and 30 millimeters, preferably between 8 and 20 millimeters.

At this height, the lid has a very good torsional rigidity and thus ensures a secure closure of the container.

A method for producing a lid made of paper or paper-like material according to the invention is when a flat blank is deep-drawn and so first a dome or, if no dome is provided, a peripheral edge is formed.

As a result, the basic shape of the lid is formed. The use of the deep drawing process avoids wrinkles or kinks.

In this case, a part of the dome formed by deep drawing is folded outwards and thus formed the edge.

This can be created with a relatively simple process step, a stable lid.

According to the invention, radii and embossments for stabilizing the transitions are provided in the region of the transitions between the cover surface and the dome and / or the dome and the edge or cover surface and frame / rim.

The radii avoid fractures of the material. The application of embossing can serve to stabilize the lid, but also provide a secure hold on a container. The embossments often run vertically, but can also be horizontal or inclined.

Another very advantageous method step is also present when multi-layered areas of the lid are pressed.

As a result, not only the shape of the lid is determined, but also multi-layered places of the lid joined together.

Another possibility for producing a lid made of paper or paper-like material according to the invention also exists if a groove is formed in a flat blank in the area of the mandrel to be formed, thus forming the dome or a shoulder for the dome.

The formation of the channel determines a rough shape of the lid and indicates both dome and rim. The channel can be designed as a stamping. The channel serves to make the lid easier to shape.

It is extremely advantageous if the dome and / or the edge is radially pressed or expanded and thus brought into the final shape.

By pressing or expanding the dome and the rim is finally formed and shaped.

In the following the invention will be illustrated with reference to several embodiments.

• 1 ein Schaubild eines ersten Deckels mit Deckelfläche und nach unten gerichtetem Rand,
• 2 einen Schnitt durch eine Variante dieses Deckels,
• 3 ein Schaubild eines weiteren Deckels mit Deckelfläche, Dom und nach unten gerichtetem Rand/Zarge,
• 4 einen Schnitt durch eine Variante dieses Deckels,
• 5 eine schematische Abfolge einer ersten Möglichkeit zur Herstellung eines solchen Deckels,
• 6 eine schematische Abfolge einer zweiten Möglichkeit zur Herstellung eines solchen Deckels, und
• 7 eine schematische Abfolge einer dritten Möglichkeit zur Herstellung eines solchen Deckels.

Showing:

• 1 a diagram of a first lid with lid surface and downwardly directed edge,
• 2 a section through a variant of this cover,
• 3 a diagram of another lid with lid surface, Dom and downwardly directed edge / frame,
• 4 a section through a variant of this cover,
• 5 a schematic sequence of a first way of producing such a lid,
• 6 a schematic sequence of a second way of producing such a lid, and
• 7 a schematic sequence of a third way of producing such a lid.

With reference number 1 is in 1 a lid with a lid surface 2 and a circumferential, downwardly directed edge / frame 3 designated.

The lid is made in one piece from paper, cardboard, cardboard or other paper-like material. Essential in such a paper-like material is that a large amount of fiber is included.

These materials are usually biodegradable and / or are made from renewable raw materials, so that the environmental balance of these materials compared to common plastics for plastic lids significantly better.

In this context, it is also conceivable that polymers, in particular biopolymers are used as binders for the fibers.

The cover materials can be coated on at least one side, impregnated or even painted to produce a good resistance to the container fillers.

Also, a lamination with a very thin polymer film is conceivable.

In addition, the lid material can also be printed on at least one side, be equipped with patterns, information or other designs.

In the lid edge 3 can be a partial or circumferential imprint 4 be attached, which can dig under an edge of the packaging container, not shown, and so the lid 1 attached to the container.

The imprint 4 often runs horizontally and is inward to the lid surface 2 directed towards. But it is also conceivable that the embossing 4 defined vertically, obliquely or even helically.

The imprints 4 may be attached in sections.

Instead of the imprints 4 can the edge 3 also at his from the top surface 2 facing away from a curl, Umfalzung or the like, which is preferably directed inward and serves as a latching device.

The edge 3 can be, starting from the lid surface 2 , conically widening.

At the transition between the lid surface 2 and edge 3 can further, preferably radially extending embossments 5 be provided, which strengthen the transition and stabilize. In this context is also a variant of the imprints 5 conceivable as they are in 2 is shown. The embossing runs here 5 essentially along the circumference of the lid area 2 and can be a defined distance to the transition between the lid surface 2 and edge 3 taking. The imprint 5 can also be arranged in sections.

By means of these embossings it can also be prevented that the deep-drawn shape regresses again. It is also conceivable that these imprints 5 can serve as a spacer or stacking aid.

The transition itself has a radius, so that the material load at the transition is kept as low as possible.

As in 3 shown, can be a lid 31 also a circulating cathedral 36 respectively.

Such a lid 31 revolves around its lid surface 32 an upward wall 33 on, which has a radius on the lid surface 32 followed. This wall 33 forms part of the cathedral.

The wall 33 extends between 0.5 and thirty, preferably up to ten millimeters upwards. Thereafter, a second wall extends outside 34 approximately parallel to it down and forms in about the top surface 32 protruding part of an edge 35 ,

The edge 35 can turn one or more imprints 37 have a latching of the lid 31 allow on one edge of the container.

The two walls 33 and 34 make up in the over the lid area 32 towering section of the cathedral 36 ,

The cathedral 36 gives the lid 31 not only a very high stability, but can also serve as a stacking aid, which is a deforming several stacked lid 31 can also prevent as a successive gluing together lid 31 when unstacking. In addition, the cathedral 36 serve as a centering aid for stacked containers to be stacked on top of each other. An undesirable slippage of these containers against each other is avoided.

The two walls 33 and 34 can be directly adjacent to each other or at a distance from each other.

At the transitions between the sections radii are provided by imprints 38 strengthened and stabilized.

The material used is fiber-containing raw materials, such as fiber form.

Overall, all variants of the cover according to the invention are one-piece, wrinkle-free cover that can dispense with plastics at least in so far as they are not needed to form a barrier layer.

Due to the wrinkle-free configuration, it is possible that the lid tightly close the respective container.

Various forms of the lid are conceivable. For example, lids can be provided for round, oval, angular or other containers.

The cathedral 36 can be provided circumferentially or at least over a partial area.

As a barrier layer but also biopolymers, waxes or the like can be used.

All lids according to the invention are produced in one piece by deep drawing.

Thermoforming in relation to the present invention refers to any forming process which alters the material in shape. It is irrelevant whether this is a classic deep-drawing process, in which the material is drawn by negative pressure in a mold, or whether working with overpressure, stamping or the like. Essential is a wrinkle-free and smooth forming.

Essentially, three variants are conceivable, but not exclude variations and combinations.

In the first variant, a lid surface is first deep-drawn from a flat blank, to which either a wall 33 or just an edge 3 followed.

Subsequently, the imprints 4 or. 37 attached, which can serve as locking lugs to a container, not shown.

In addition, then can still imprints 5 or. 38 directly in the area of the transition, which reinforce the transition.

A pressing can be carried out mainly in the radial direction to the edge 3 or the wall 33 align.

Subsequently, a part of the wall 33 be turned outwards, which then the wall 34 and the edge 35 forms.

It is also conceivable, as in 6 shown, in a modification thereof, not the wall 34 move to the outside, but to deepen the lid surface by a deep drawing step in the lid.

A pressing can be provided again after the folding to the wall 34 to align and smooth any bumps. Wrinkles, as they occur in classic deep-pressing are not generated in the present method.

However, the use of thermoformable material is necessary.

The thermoformable material can, for improved thermoforming properties, be moistened and / or heated or have a high moisture content.

Another procedure, which, however, leads to the same product can be designed such that in a flat blank first a circumferential groove is impressed, which finally the cathedral 36 will form.

This groove is then deepened by a deep drawing process so that it corresponds to the height of the dome.

Subsequently, the blank or partially formed lid is still pressed radially and vertically around the dome, the edge / frame and the lid surface completely form.

When pressing directly all necessary imprints can be attached.

Claims (12)

Lid (1) for containers, in particular lids (1) for packaging containers, the packaging containers being able to represent cups, bowls or the like, the lid (1) being designed as an attachment lid, snap lid, insertion lid or the like having a peripheral edge (3), wherein the lid (1) made of a paper or paper-like material deep-drawn or in one of them is formed modified process, with an inner lid surface (2) of the peripheral, downwardly directed edge (3) directly or indirectly connects, which can be slightly conical and wherein the edge (3) embossing (4), convolutions, folds or Has the same, which extend vertically and / or horizontally and act as locking lugs, characterized in that at the transitions between the lid surface (2) and edge (3) embossments (5) are provided. Lid (1) for containers, in particular lids (1) for packaging containers, the packaging containers being able to represent cups, bowls or the like, the lid (1) being designed as an attachment lid, snap lid, insertion lid or the like having a peripheral edge (3), wherein the lid (1) is deep drawn from a paper or paper-like material or formed in a modified process, with an inner cover surface (2) directly or indirectly adjoins an upwardly directed dome (36), which may be formed circumferentially and to which the peripheral, downwardly directed edge (3) directly or indirectly connects, which may be slightly conical and wherein the edge (3) embossments (4), convolutions, folds or the like, which extend vertically and / or horizontally and as Locking lugs act, characterized in that at the transitions between the cover surface (2) and dome (36) and / or dome (36) and edge (3) embossments ( 38) are provided. Cover after Claim 1 , characterized in that the edge (3) is designed as a stacking aid. Cover after Claim 2 , characterized in that the edge (3) and / or the dome (36) are designed as stacking aid. Lid according to one of the preceding claims, characterized in that portions of the lid (1, 31) are pressed, expanded, folded over and / or rolled. Lid according to one of the preceding claims, characterized in that the lid (1, 31) has a round, oval, angular or rounded shape. Lid according to one of the preceding claims, characterized in that the lid (1,31) has a height of between five and thirty millimeters, preferably between eight and twenty millimeters. A method for producing a cover of paper or paper-like material according to one of Claims 1 . 3 . 5 to 7 , characterized in that a flat blank is deep drawn and so a peripheral edge (3) is formed and that in the edge (3) embossments (4), reels and / or folds are introduced, which extend vertically and / or horizontally and as locking lugs act and that in the area of the transitions between the lid surface (2) and edge (3) radii are provided and embossments (5) are attached to stabilize the transitions. A method for producing a cover of paper or paper-like material according to one of Claims 2 . 4 to 7 , characterized in that a flat blank is deep drawn and so first a dome (36) is formed and then a part of the formed by deep drawing dome (36) folded outwards and so an edge (3) is formed and that in the edge (3 ) Embossments (4), reels and / or folds are introduced, which extend vertically and / or horizontally and act as locking lugs and that in the region of the transitions between the cover surface (2) and dome (36) and / or dome (36) and edge (3) radii are provided and embossments (5, 38) are applied to stabilize the transitions. Method according to Claim 8 or 9 , characterized in that multi-layered areas of the lid (1, 31) are pressed. A method for producing a cover of paper or paper-like material according to one of Claims 2 . 4 to 7 , characterized in that in a flat blank in the region of the dome to be formed (36) formed a groove and so the dome (36) and / or a shoulder for the dome is formed. Method according to Claim 11 , characterized in that the dome (36) and / or the edge (3) is radially pressed or expanded and thus brought into the final shape.

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