CN115298390A - Natural fiber cap with undercut - Google Patents

Abstract

The invention relates to a manufacturing part (1) at least for final forming of a preformed cover (100) made of a material (M) containing natural fibers to form an undercut (140), as a first tool in a forming station (10), the preformed cover (100) comprising a top part (130) and a side part (110) surrounding the top part (130), wherein the manufacturing part (1) is adapted to contact an outer side (110) of the preformed cover (100) to final form the preformed cover (100) by applying a First Movement (FM) in an axial direction along a central axis (R) of the manufacturing part (1) and subsequently applying a Second Movement (SM) in a second direction towards the side part (120) of the preformed cover (100), wherein a plurality of side forming elements (2) of the manufacturing part (1) are arranged to apply the Second Movement (SM), applying an external Pressure (PA) to the undercut (140) of the side part (120) on the outer side (110) forming the undercut (140) in the side part (120). The invention also relates to a forming table (10) with such a manufacturing part (1), a forming device (80) comprising such a forming table (10), a final formed lid (100 ') manufactured with such a forming table (10) comprising undercuts (140) and a method (200) of manufacturing such a lid (100') with undercuts (140).

Description

Natural fiber cap with undercut

Technical Field

The present invention relates to a manufactured part as a first tool in a forming table for forming undercuts (undercuts), a forming table with such a manufactured part, a forming device comprising such a forming table, a final formed (endformed) lid manufactured with such a forming table comprising undercuts and a method of manufacturing such a lid with undercuts.

Background

It is desirable to protect citizens and the environment from plastics. Particularly disposable plastic articles such as packaging materials or plastic cutlery and tableware, generate a large amount of waste. In this respect, there is an increasing demand for alternative materials for plastic packaging materials and containers, with which these products can be manufactured from recyclable plastics, materials with a low plastic content or even from plastics-free materials.

The idea of using natural fibres instead of traditional plastics in extrusion processes has existed at least since the early 90's of the 20 th century, see for example EP 0 447 792B1. As with most fiber processing methods, the raw material here is pulp. In principle, the pulp consists of water, natural fibres and a binder, such as industrial starch (potato starch), and has a pulp-like consistency.

Since consumers are interested in a wide variety of naturally compatible products having different sizes, shapes and requirements, and do not necessarily require very large quantities of these products, it is desirable to have a method of manufacturing environmentally compatible molded parts made of natural fibers and the corresponding available machines, so that these products (molded parts) of good quality can be produced efficiently, flexibly and reproducibly.

In the case of container lids, such as for coffee cups and the like, plastic lids often include undercuts to obtain a secure closure of the container to prevent accidental lifting of the container lid and thus accidental leakage of the container contents. When the lid is placed on top of the container and the undercut snaps onto the container in the safe position, the undercut acts as a tactile or acoustic feedback to the user when the lid closes the container by hearing or feeling a click. In the case of using a cap made of natural fiber, the preparation of such an undercut is difficult. There is no tooling technology for a molding machine to make a lid with an undercut that provides such reliable feedback. Therefore, caps made of natural fiber materials cannot replace plastic caps without loss of safety.

Accordingly, there is a need to provide a tooling technique that enables the manufacture of closures from natural fiber materials to provide a common level of security for the closure of containers with such closures.

Disclosure of Invention

It is an object of the present invention to provide a tooling technique that enables the manufacture of a closure from natural fibre materials, providing a common level of security for closing containers having such closures.

This object is achieved by a manufacturing part for use as a first tool in a forming station at least for final forming of a preformed cover made of a material comprising natural fibres, the preformed cover comprising a top and a side surrounding the top, wherein the manufacturing part is adapted to contact an outer side of the preformed cover for final forming of the preformed cover by applying a first movement in an axial direction along a central axis of the manufacturing part and subsequently applying a second movement in a second direction towards the side of the preformed cover, wherein a plurality of side forming elements of the manufacturing part are arranged to apply the second movement, applying an external pressure onto the outer side of the side to form an undercut in the side.

Such undercuts are necessary to provide a reliable tactile or acoustic feedback to the user when closing a container such as a coffee cup to inform the user of an established and safe closing of the container. In order to protect the user, the container containing the hazardous substance (e.g. hot liquid) should be safely closed. After having received the feedback provided by the undercut, the user can ensure that dangerous contents are not touched in an unintended manner (e.g. by spilling hot coffee on their fingers).

The term "undercut" means a suitable curved or arcuate shape in a part (lid) that interacts with another part (e.g. a container) when the two parts (container and lid forming a closed container) are joined together. The undercut engages a corresponding counter-shape of the other component or snaps behind a bead or edge of the other component to mechanically secure the one component to the other component. Depending on the characteristics of the respective container, the undercut in the lid may have different shapes within the scope of the invention.

The second movement of the preforming by the side-forming element is directed to the side of the preformed cap, into which the undercut will be introduced. Preferably, the second movement is perpendicular to the outside of the side portion. Since the side part has a shape surrounding the top of the lid, the side forming element has a similar shape, so that preferably the side part is in full contact with the inner side of the side forming element. In the case of a circular cap, the second movement is directed radially towards the central axis of the manufactured part, which is the axis of symmetry of the circular cap.

The term "final-shaped lid" denotes a specific manufacturing step of the final-shaped lid shape. The final forming does not exclude that an additional production step without changing the shape of the lid may be performed after the final forming of the lid. The final shaping also does not limit or exclude any production steps before final shaping takes place. For final shaping of the lid, the lid may be provided as an already existing preform, or the material of the lid may be provided in other forms (e.g. as a sheet) and will be preformed in a preforming station or directly within the forming station.

The lid may have any suitable shape to close the corresponding container, and the container may also have any suitable shape. The cover has a top and sides surrounding the top. A common cover may be circular or rectangular. However, any other shape of lid and container is possible. The manufacturing part and the forming station according to the invention are suitable for forming undercuts on the sides of the lid, not limited to a specific shape of the lid, nor to a specific shape of the undercuts. The material of the cover comprises natural fibres. The material may comprise additional other materials, for example applied as a composite material together with the natural fibres, or applied as an additional layer on top of the natural fibre material. Such layer or layers may be applied to the outside or inside of the cover. In one embodiment, the cover is completely covered by the layers. In one embodiment, the cover may be constructed of a natural fiber material. In any case, the natural fiber material may be impregnated with other materials to increase at least the resistance or impermeability to liquids and/or moisture.

The manufactured part is used as a tool in a forming station. Here, the manufacturing part may be an upper or lower tool in the forming station, depending on the particular forming station and forming process.

The term "moving one tool on top of another" does not imply any direction of movement, in particular that one tool that is not moved is arranged above another tool. The term simply means that the two tools are moved together at least during the forming of the undercut.

The manufacturing component according to the invention provides a tool technique that enables the manufacture of caps from natural fibre materials, providing a common level of security for closing containers with such caps by forming undercuts in the final formed cap.

In one embodiment the side profiled elements are arranged around a central axis, wherein the side profiled elements are suitably profiled to provide free space between adjacent side profiled elements before applying the second movement. The arrangement around the central axis enables the side forming elements to introduce undercuts along the entire side of the preformed cap. The free space enables all the side forming elements to apply a defined external pressure to the entire side of the preformed lid, since the side forming elements have sufficient freedom of movement to fully contact the side without being hindered by mechanical contact between adjacent side forming elements.

In another embodiment the manufactured part comprises at least three side forming elements, preferably four to six side forming elements, more preferably seven to nine side forming elements, even more preferably ten side forming elements. As the number of side forming elements increases, the applied external pressure will be more uniform around the sides of the preformed cap. However, the complexity of the mechanical structure for performing the second movement with all the side forming elements will increase with the number of side forming elements. The above-mentioned specific number of lateral forming elements is a good compromise between the uniformity of the applied external pressure and the effort to establish and maintain the mechanical structure to perform the second movement.

In another embodiment, in case the circular preformed cap has a circumferential side, the second direction is a radial direction towards the central axis and the side forming elements are arranged circularly around the central axis.

In another embodiment, each side forming element comprises an inner side facing the outer side of the preformed cap, wherein each inner side has a profile adapted to the desired shape of the undercut. Preferably, the side-forming elements are suitably shaped to provide an undercut around the side of the preformed lid. An undercut located along the entire side of the lid will provide a very secure closure of the container. The circumferential undercut will provide a safer closure of the container.

In another embodiment, at least a portion of the surface of the manufactured part for contact with the natural fiber material of the preformed cap is made of a material having reduced friction or adhesion properties. Friction or sticking may be reduced by smoothing the surface of the manufactured part. For this purpose, the manufacturing component may be made of a material whose surface may be polished. Optionally, the manufactured part may be at least partially covered with a lubricious coating. Preferably, at least the inner side of the side profiled elements is made of a material with reduced friction or adhesion properties, or is coated with at least one layer of such a material.

The invention also relates to a forming station comprising at least a first tool and a second tool for final forming of a preformed cover, wherein the manufactured part according to the invention is the first tool, preferably an upper tool, and the second tool, preferably a lower tool, is adapted to carry at least the preformed cover, wherein at least one motor system is adapted to move the first tool on top of the second tool between a first movement and a subsequent second movement, wherein the preformed cover is located between the first movement and the subsequent second movement to move a side forming element of the first tool towards a side of the preformed cover, applying an external pressure onto an outside of the side to form an undercut in the side.

The forming station according to the invention provides a tool technique that enables the manufacture of caps from natural fibre materials, providing a common level of security for closing containers with such caps by forming undercuts in the final formed cap.

The second tool acts as a counterpart to the first tool when the undercut is formed. In one embodiment, the second tool is suitably formed to support at least the inner side of the side portion during application of external pressure to the outer side of the side portion by the side portion forming element, so that the side portion forming element reliably forms the undercut.

In another embodiment, the second tool comprises a counter part supporting the inner side of the side portion, wherein the contour of the counter part is adapted to form the desired shape of the undercut at the inner side of the side portion. With such counter parts the external pressure for forming the undercut can be applied in a more defined and reproducible process compared to tools not comprising such counter parts.

In another embodiment the counterpart member is divided into movable counterpart member elements adapted to be moved towards the central axis in order to be able to easily release the final formed lid after final forming.

In another embodiment, the forming station is adapted to receive a preformed cap from the preforming station. Here, the degree of automation of the production process increases, also leading to a more efficient and faster process.

In another embodiment, the forming station is adapted to pre-form the lid prior to final forming of the pre-formed lid. Here, the number of required processing stations is reduced, enabling a more compact process to be provided.

In another embodiment, the material is provided as a sheet for a preformed cover. The sheet material enables a quasi-continuous production process. Sheet form material can be handled more easily and takes up less space than pulp processes. In another embodiment, the sheet material is provided directly to a forming station where the forming station pre-forms and ultimately forms the lid.

In another embodiment, both the first tool and the second tool are moved by a motor system to place the upper tool on top of the second tool, preferably both tools are moved simultaneously. Moving the two parts results in a reduction of the opening and closing times of the first and second tools of the forming table.

The invention also relates to a forming apparatus comprising a forming station according to the invention and a preforming station, wherein the preforming station is adapted to preform a lid from a material comprising natural fibres, the forming station is adapted to receive the preformed lid from the preforming station and to provide a final formed lid comprising an undercut in a side of the final formed lid. The preforming station as part of the forming apparatus allows to control both the preforming and the final forming production steps in one apparatus, thereby obtaining a better process control and a better final forming quality.

The forming device according to the invention provides a tool technique that enables the manufacture of caps from natural fibre materials, providing a common level of security for closing containers with such caps by forming undercuts in the final formed cap.

In one embodiment, the forming apparatus further comprises a transfer station that conveys the preformed caps to the forming station to form the preformed caps. This also increases the degree of automation of the production process, further resulting in a more efficient and faster process. In a preferred embodiment, the forming apparatus further comprises a stacking station to stack the final formed lids output from the forming station.

In another embodiment, the material is provided as a sheet to a preforming station to preform the cover from the sheet. The sheet material enables a quasi-continuous production process. Sheet form material can be handled more easily and takes up less space than pulp processes.

In another embodiment, the preforming station applies a pulp process to preform the cover. There is a long-felt need to form products using natural fibers. At present, natural fiber products exist in the market, but the quality and the performance can not meet the requirements of food containers. As with most fiber processing processes, the raw material basis here is pulp. In principle, the pulp consists of water, natural fibres and a binder, such as industrial starch (potato starch), and has a pulp-like consistency. The term "pulp" refers to a fluid substance comprising fibers, here an environmentally friendly degradable fibrous material. The term "liquid" refers herein to the aggregated state of pulp, wherein liquid pulp comprises environmentally degradable fibrous material in the form of fibers. The fibers may be individual fibers, a fiber structure or a fiber group consisting of several fibers bonded together. Fibers represent fibrous materials, whether or not they are present in the pulp as individual fibers, fibrous structures, or groups of fibers. The fibres are dissolved in the liquid solution in such a way, for example as a mixture or suspension of liquid solution and fibre material, that they float in the liquid solution in as equal a concentration as possible, irrespective of the position.

The invention also relates to a final profiled cover made of a material comprising natural fibres, comprising a top and sides surrounding the top and an undercut in the sides, the undercut being formed by a forming table according to the invention, preferably the undercut surrounding the sides.

The material of the final formed cap comprises natural fibers. The material may comprise additional other materials, for example applied as a composite material together with the natural fibres, or applied as an additional layer on top of the natural fibre material. Such layer or layers may be applied to the outside or inside of the cover. In one embodiment, the final shaped cover is completely covered by the layers. The layer of natural fibre material or additional material may be applied before or after final forming of the lid. In one embodiment, the final-shaped cover may be constructed of a natural fiber material. In any case, the natural fiber material may be impregnated with other materials to increase resistance or impermeability to at least liquid and/or moisture.

The final-formed lid according to the invention is derived from a tool technology that enables the lid to be manufactured from natural fibre material, providing a common level of security for closing containers with such lids by forming undercuts in the final-formed lid.

The invention also relates to a method for providing a final shaped cover made of a material comprising natural fibres with a forming table according to the invention having a manufactured part according to the invention as a first tool and a second tool, wherein the preformed cover comprises a top part and a side part surrounding the top part, the method comprising the steps of:

-providing a preformed cover;

-preforming a first movement in an axial direction along a central axis of the manufactured part to contact the outside of the cover using at least a first tool;

-preforming a subsequent second movement in a second direction, wherein the plurality of side forming elements of the first tool are moved towards the central axis of the lid to exert an external pressure on the outside of the side of the lid, thereby forming an undercut in the side to establish the final formed lid; and

-a final shaped cover with undercut at the output side.

The method according to the invention allows to provide a common level of safety for closing containers with such lids by forming undercuts in the final formed lid using tooling techniques capable of manufacturing lids from natural fibre materials.

In one embodiment, the method further comprises the step of preforming the material in a preforming station to provide a preformed cover.

In another embodiment, the method further comprises the steps of:

-transferring the preformed cap from the preforming station to the forming station using a transfer station; and/or

-stacking the final formed lids exiting from the forming station by means of a stacking station.

In another embodiment, the method further comprises the step of providing the material as a sheet to a preforming station for the preforming step.

In another embodiment of the method, the step of preforming the material applies a pulp process.

In another embodiment of the method, the step of preforming the material may be preformed in a forming station prior to final forming of the preformed lid, wherein the forming station may pre-form the function of the pre-forming station, preferably the material is provided as a sheet to the forming station. The forming station may preform the lid in a different manner than the process applied in the preforming station or the process applied in any other station for preforming the lid.

It should be noted that in the context of patent applications, indefinite articles and indefinite digital data such as "one \8230;," "two \8230;" etc. It is generally understood as the minimum data, i.e., "at least one of 8230 \8230;," "at least two of 8230;," "8230;" and so on, unless it is meant that only "exactly one of 8230;" \8230;, "" exactly two of 8230; "and so on, can be clearly seen from the context or from the specific text of a paragraph.

It is understood that the above-described embodiments or features thereof may also be combined with each other in any combination deviating from the claims and the subsequent references in order to provide a solution to the above-described task within the scope of the present invention.

Components that are at least substantially identical in terms of their function in the various figures are denoted by the same reference numerals, so that they do not have to be numbered and explained in all figures.

Drawings

In the figure:

FIG. 1: a forming table according to the invention having a manufacturing part as an upper tool;

FIG. 2: a final form cap with undercut according to the invention;

FIG. 3: the side forming elements (a) prior to the second movement and (b) after the second movement creating the undercut;

FIG. 4: (a) A side view schematic of a mating portion of a second tool and (b) a forming table;

FIG. 5 is a schematic view of: a molding device according to the present invention; and

FIG. 6: according to the present invention there is provided a method of final forming a lid from natural fibre material.

Detailed Description

Fig. 1 shows a forming station 10 comprising a first and a second tool 1, 20 at least for final forming of a preformed cover 100 made of a material M comprising natural fibers, wherein the first tool 1 is an upper tool and the second tool 20 is a lower tool adapted to carry at least the preformed cover 100, wherein at least one motor system 30 is adapted to move the first tool 1 on top of the second tool 20 in a first movement FM followed by a second movement SM, wherein the preformed cover 100 is between the first movement FM followed by the second movement SM to final form the preformed cover 100 to comprise an undercut 140. The manufacturing part 1 establishes a first tool 1 in a forming station 10. Preformed cover 100 includes a top 130 and sides 110 surrounding top 130. The manufacturing component 1 (first tool) is adapted to contact the outer side 110 of the preformed cover 100 to finally shape the preformed cover 100 by applying a first movement FM in an axial direction along the central axis R of the manufacturing component 1. Here, both the first tool 1 and the second tool 20 are moved by the motor system 30 to place the upper tool 1 on top of the second tool 20, preferably both tools 1, 20 are moved simultaneously. Subsequently, a second movement SM in a second direction towards the side 120 of the preformed cover 100 is preformed by the manufactured part 1. The plurality of side forming elements 2 of the manufacturing part 1 are arranged to apply a second motion SM applying an external pressure PA onto the outer side 110 of the side 120 to form an undercut 140 in the side 120. Here, at least a portion of the surface of the production part 1 intended to come into contact with the material M of the preformed cover 100 is made of a material having reduced friction or adhesion properties. The second tool 20 is suitably shaped to support at least the inner side 150 of the side portion 120 during the application of external pressure by the side forming element 2 to the outer side 110 of the side portion 110, so that the side forming element 2 reliably forms the undercut 140. The forming station 10 is adapted to receive a preform lid 100 from the preform station 50. Alternatively, the forming station 10 may be adapted to pre-form the lid 100 prior to final forming of the pre-formed lid 100. The material M may be provided as a sheet for pre-forming the cover 100.

Fig. 2 shows a final shaped cap 100' according to the invention with undercuts 140, which is made of a material M comprising natural fibres. The final-formed lid 100' includes a top portion 130 and a side portion 110 surrounding the top portion 130, the side portion 110 having an exterior side 110 and an interior side 150. The outer side 110 represents the outer side of the top of the cap and the side 120 of the cap 100'. The lid 100' also comprises an undercut 140 in the side 120 formed by the forming table 10 according to the invention. Preferably, the undercut 140 surrounds the side 120. The numbers shown herein for the sides 120, outer sides 110, inner sides 150, and top 130 associated with the final formed lid 100 also apply to the preformed lid 100.

Fig. 3 shows the side forming element 2 (a) before and (b) after the second movement SM for producing the undercut 140. The side profiled elements 2 are arranged around a central axis R, wherein the side profiled elements 2 are suitably profiled to provide a free space 21 between adjacent side profiled elements 2 before applying the second motion SM, see fig. 3a. Here, the manufactured part 1 comprises four side profiled elements 2 arranged symmetrically to each other. Other embodiments may have a different number of side profiled elements 2. In this example, the preformed cover 100 is circular with a surrounding side 110, the second direction for the second movement SM is a radial direction towards the central axis R, and the side forming elements 2 are arranged circularly around the central axis R. Each element 2 comprises an inner side 2i facing the outer side 110 of the side 120, wherein each inner side 2i has a profile adapted to the desired shape of the undercut 140, wherein the shape of the side forming element 2 is adapted to provide that the undercut 140 surrounds the side 120 of the preformed cap 100. At least the inner side 2i of the side profiled element 2 may be made of a material having reduced friction or adhesion properties or coated with at least one layer of such a material.

Fig. 4 shows a schematic view of (a) the counter part 40 of the second tool 20 and (b) the forming table 10 in a side view. The second tool 20 comprises a counter part 40 to support an inner side 150 of the side 120 of the preformed cap 100, wherein the counter part 40 is contoured to form the desired shape of the undercut 140 at the inner side 150 of the side 120. The counterpart 40 is inserted into a movable counterpart element 45 (see fig. 4 a), which counterpart element 45 is adapted to be moved towards the centre axis R in order to release the finally formed lid 100' from the forming station 10 after the final forming.

Fig. 5 shows a forming device 80 according to the invention, comprising a forming station 10 and a preforming station 50 according to the invention. The preforming station 50 is adapted to preform the lid 100 from a material M comprising natural fibers. The forming station 10 is adapted to receive a preformed lid 100 from the pre-forming station 50 and provide a final formed lid 100 'including an undercut 140 in the side 120 of the final formed lid 100'. The forming apparatus 80 further includes a transfer station 60 that conveys the preformed caps 100 to the forming station 10 to form the preformed caps 100, and a stacking station 70 that stacks the final formed caps 100 output from the forming station 10. Here, the material M is supplied as a sheet to the preforming station 50 to preform the cover 100 from the sheet. Alternatively, the preforming station 50 may apply a pulp process to preform the cover 100.

Fig. 6 shows a method 200, which method 200 provides a final shaped cover 100 according to the invention made of a material M comprising natural fibers, with a shaping table 10 according to the invention, wherein a component 1 is manufactured according to the invention as a first tool and a second tool 20, wherein the preformed cover 100 comprises a top part 130 and a side part 110 surrounding the top part 130, the method comprising the steps of: providing 210 a preformed cover 100; performing 220 a first movement FM in an axial direction along the central axis R of the manufactured part 1 with at least a first tool 1 to contact the outer side 110 of the cover 100; preforming 230 a subsequent second movement SM in a second direction, wherein the plurality of side forming elements 2 of the first tool 1 are moved towards the central axis R of the lid 100 to apply an external pressure PA onto the outer side 110 of the side 120 of the lid 100, thereby forming an undercut 140 in the side 120 to establish the final formed lid 100'; and outputting 240 the final formed lid 100 'with the undercut 140 in the side 120, and finally outputting the final formed lid 100' from the forming station 10 by stacking 270 through the stacking station 70. In one embodiment, the method includes the steps of preforming 250 the material M in the preforming station 50 to provide a preformed lid 100 and transferring 260 the preformed lid 100 from the preforming station 50 to the forming station 10 having a transfer station. Here, the material M may be provided 280 to the preforming station 50 as a sheet for the preforming step 250. Alternatively, the preforming step 250 of the material M may apply a pulp process. In a further alternative, the preforming step 250 of the material M may be preformed in the forming station 10 before the final forming of the preformed lid 100, wherein the forming station 10 pre-forms the function of the preforming station 50. In this case, the material M is supplied directly to the forming table 10, for example as a sheet 280, for a first movement of the preforming 220 in the axial direction with the upper tool.

In this connection, it should be expressly pointed out that the features of the solutions described above or in the claims and/or in the figures can also be combined, if necessary, in order to be able to carry out or realize the explained features, effects and advantages in a corresponding cumulative manner.

Reference numerals

1. Manufacturing a component according to the invention (first tool, e.g. upper tool)

2. Side forming element for manufacturing parts

Inside of 2i side forming element

21. Free space between adjacent side profiled elements

10. Moulding table according to the invention

20. Second tools, e.g. lower tools

30. Motor system of forming table

40. Counter-parts of second tools, e.g. ring-shaped parts of second tools

45. Mating part element

50. Preforming table

60. Transfer platform

70. Stacking table

80. Molding apparatus according to the present invention

100. Preformed cover

100' Final Forming Cap according to the invention

110. Outside of covers, e.g. of cover sides

120. Side part of the cover

130. Top of the cover

140. Undercut

150. Inside of the cover side

200. Method 210 of final forming a lid made of natural fiber material using a forming station according to the present invention provides a preformed lid

220. Performing a first movement in axial direction by means of an upper tool

230. Preforming a subsequent second movement in the radial direction by means of a plurality of lateral forming elements of the upper tool

240. Output final formed cover

250. Preforming the lids in a preforming station

260. Transferring caps from a preforming station to a forming station with a transfer station

270. Stacking the final formed covers output from the forming table by a stacking table

280. Providing a natural fiber material as a sheet

D undercut depth

Center shaft of R cover

PA axial pressure

M Natural fiber Material

FM first movement

SM second motion

Motion of RM to release final form cap from second tool

Claims (27)

1. A manufacturing part (1) for use as a first tool in a forming station (10) for at least final forming of a preformed cover (100) made of a material (M) comprising natural fibres, the preformed cover (100) comprising a top part (130) and a side part (110) surrounding the top part (130), wherein the manufacturing part (1) is adapted to contact the outer side (110) of the preformed cover (100) for final forming of the preformed cover (100) by applying a First Movement (FM) in an axial direction along a centre axis (R) of the manufacturing part (1) and subsequently applying a Second Movement (SM) in a second direction towards the side part (120) of the preformed cover (100), wherein a plurality of side forming elements (2) of the manufacturing part (1) are arranged to apply the Second Movement (SM) applying an external Pressure (PA) onto the outer side (110) of the side part (120) for forming an undercut (140) in the side part (120).

2. Manufacturing part (1) according to claim 1,

it is characterized in that the preparation method is characterized in that,

the side profiled elements (2) are arranged around a central axis (R), wherein the side profiled elements (2) are suitably profiled to provide free spaces (21) between adjacent side profiled elements (2) before applying the Second Motion (SM).

3. Manufacturing part (1) according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the manufactured part (1) comprises at least three side forming elements (2), preferably four to six side forming elements (2), more preferably seven to nine side forming elements (2), even more preferably ten side forming elements (2).

4. Manufacturing part (1) according to one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

in case of a circular preformed cap (100) having a surrounding side (110), the second direction is a radial direction towards the central axis (R) and the side forming elements (2) are arranged circularly around the central axis (R).

5. Manufacturing component (1) according to one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the side profiled elements (2) each comprise an inner side (2 i) towards the outer side (110) of the side portion (120), wherein each inner side (2 i) has a profile adapted to the desired shape of the undercut (140).

6. Manufacturing part (1) according to claim 5,

it is characterized in that the preparation method is characterized in that,

the side forming element (2) is suitably shaped to provide an undercut (140) around the side (120) of the preformed lid (100).

7. Manufacturing component (1) according to one of the preceding claims,

it is characterized in that

At least a portion of the surface of the manufactured part (1) intended to come into contact with the material (M) of the preformed cover (100) is made of a material having reduced friction or adhesion properties.

8. Manufacturing part (1) according to claim 7,

it is characterized in that

At least the inner side (2 i) of the side profiled element (2) is made of a material with reduced friction or adhesion properties, or is coated with at least one layer of such a material.

9. Moulding station (10) comprising at least a first and a second tool (1, 20) for final moulding of a preformed lid (100), wherein the manufactured part (1) according to one of the preceding claims is a first tool, preferably an upper tool, and the second tool (1, 20), preferably a lower tool, is adapted to carry at least the preformed lid (100), wherein at least one motor system (30) is adapted to move the first tool (1) on top of the second tool (20) between a First Movement (FM) and a subsequent Second Movement (SM), wherein the preformed lid (100) is between the First Movement (FM) and the subsequent Second Movement (SM) to move a side forming element (2) of the first tool (1) towards a side (120) of the preformed lid (100), applying an external pressure onto an outer side (110) of the side (120) to form an undercut (140) in the side.

10. Moulding station (10) according to claim 9,

it is characterized in that the preparation method is characterized in that,

the second tool (20) is suitably shaped to support at least the inner side (150) of the side part (120) during application of external pressure to the outer side (110) of the side part (110) by the side forming element (2), so that the side forming element (2) can reliably form the undercut (140).

11. Moulding station (10) according to claim 9 or 10,

it is characterized in that the preparation method is characterized in that,

the second tool (20) comprises a counterpart (40) supporting the inner side (150) of the side portion (120), wherein the contour of the counterpart (40) is adapted to the desired shape of the undercut (140) formed at the inner side (150) of the side portion (120).

12. Moulding station (10) according to claim 11,

it is characterized in that the preparation method is characterized in that,

the counterpart (40) is divided into movable counterpart elements (45), the counterpart elements (45) being adapted to be moved towards the central axis (R) in order to release the final formed lid (100') after the final forming.

13. Moulding station (10) according to one of claims 9 to 12,

it is characterized in that the preparation method is characterized in that,

the forming station (10) is adapted to receive a preform lid (100) from the preform station (50).

14. Moulding table (10) according to one of claims 9 to 12

It is characterized in that

The forming station (10) is adapted to preform the lid (100) prior to final forming of the preformed lid (100).

15. Moulding table (10) according to one of claims 9 to 14

It is characterized in that the preparation method is characterized in that,

the material (M) is provided as a sheet for pre-forming the lid (100).

16. Moulding station (1) according to one of claims 9 to 15,

it is characterized in that the preparation method is characterized in that,

both the first tool (1) and the second tool (20) are moved by a motor system (30) to place the upper tool (1) on top of the second tool (20), preferably both tools (1, 20) are moved simultaneously.

17. A forming device (80) comprising a forming table (10) according to one of the claims 9 to 16 and a preforming table (50), wherein the preforming table (50) is adapted to preform a lid (100) from a material (M), the material (M) comprising natural fibers, and the forming table (10) is adapted to receive the preformed lid (100) from the preforming table (50) and to provide a final formed lid (100 ') comprising undercuts (140) within the sides (120) of the final formed lid (100').

18. The molding apparatus (80) of claim 17,

it is characterized in that the preparation method is characterized in that,

the forming device (80) further comprises a transfer station (60) for transferring the preformed caps (100) to the forming station (10) for forming the preformed caps (100), and preferably further comprises a stacking station (70) for stacking the final formed caps (100') output from the forming station (10).

19. Moulding device (80) according to one of claims 17 or 18,

it is characterized in that the preparation method is characterized in that,

the material (M) is supplied as a sheet to a preforming station (50) to preform the lid (100) from the sheet.

20. Moulding device (80) according to one of claims 17 or 18,

it is characterized in that the preparation method is characterized in that,

the pre-forming station (50) applies a pulp process to pre-form the lid (100).

21. A final shaped cap (100 ') made of a material (M) comprising natural fibers, said final shaped cap (100') comprising a top (130) and sides (120) and undercuts (140) surrounding the top (130) in the sides (120) formed by the forming table (10) according to one of claims 9 to 16, preferably the undercuts (140) surround the sides (120).

22. A method (200) for providing a final shaped cover (100') made of a material (M) comprising natural fibers, having a shaping table (10) according to any one of claims 9 to 16 and a manufactured part (1) according to one of claims 1 to 8, as first and second tools (20), the preformed cover (100) comprising a top portion (130) and a side portion (110) surrounding the top portion (130), comprising the steps of:

-providing (210) a preformed cover (100);

-preforming (220) a First Movement (FM) in an axial direction along a central axis (R) of the manufactured part (1) with at least a first tool (1) to contact the outer side (110) of the cover (100);

-a subsequent Second Movement (SM) of the preform (230) in a second direction, wherein the plurality of side forming elements (2) of the first tool (1) are moved towards the central axis (R) of the cap (100) to apply an external Pressure (PA) onto the outer side (110) of the side (120) of the cap (100) to form an undercut (140) in the side (120) to form the final formed cap (100'); and

-outputting (240) the final formed lid (100') with the undercut (140) in the side (120).

23. The method (200) according to claim 22, further comprising the step of preforming (250) the material (M) in a preforming station (50) to provide a preformed cover (100).

24. The method (200) of claim 23, further comprising the steps of:

-transferring (260) the preform lid (100) from the preform station (50) to the forming station (10) using a transfer station (60); and/or

-stacking (270) the final formed caps (100') output from the forming station (10) by means of a stacking station (70).

25. The method (200) according to claim 23 or 24, further comprising the step of providing (280) the material (M) as a sheet (M) to the preforming station (50) for the preforming step (250).

26. The method (200) according to claim 23 or 24, wherein the step of preforming (250) the material (M) applies a pulp process.

27. The method (200) according to claim 23, wherein the step of preforming (250) the material (M) is able to be preformed in the forming station (10) before the final forming of the preformed cover (100), wherein the forming station (10) is able to perform the function of the preforming station (50), preferably the material (M) is provided to the forming station (10) as a sheet.

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