Device for forming and pressing mouth of container comprising fibres

Abstract

The utility model relates to a device for forming and pressing an opening part of a container (12, 52) comprising fibers, such as paper pulp, which comprises a mould (10, 54) which is used for at least surrounding the outer surface of an opening part area (53) of the container to be formed with the opening part (13, 25, 57) and comprises a structure (11, 55) for forming the opening part; a mandrel for insertion into the opening of the mouth region; and moving means for performing a relative movement between the mold and the mandrel to reduce the distance between the mold and the mandrel and thereby mold and press the mouth.

Description

Technical Field

[0001] The utility model relates to a device and a method for forming and pressing a mouth of a container including fibers according to the following embodiments. Background Art

[0002] When producing containers from fibers such as pulp, high demands are made on the strength and stability of the mouth section. It is known, for example, to subsequently add a mouth made of a different material to a container formed from pulp. The mouth can also be formed by inflating a ball in a container made from pulp. Utility Model Content

[0003] The utility model aims to provide a device and a method, which make it possible to form a shape-stable mouth of a container containing fibers such as pulp.

[0004] This object is achieved by a device and a method according to the following embodiments.

[0005] The device for forming and pressing the mouth of a container including fibers such as pulp according to the utility model comprises a mold for surrounding at least the outer surface of the mouth area of ​​the container to be formed with the mouth, wherein the mold comprises a structure for forming the mouth. In addition, the device comprises a mandrel, which is particularly used to be inserted into the opening, at least temporarily within the mouth area, and a moving device, which is used to implement a relative movement between the mold and the mandrel to reduce the distance between the mold and the mandrel and thus form and press the mouth.

[0006] The fibers may for example be at least partially plant fibers, for example comprising lignin and / or cellulose (ie Cellulose). The pulp may comprise a suspension consisting of water and fibers, for example cellulose, such as paper fibers and / or wood fibers.

[0007] The mouth region and the mouth to be formed and pressed in the mouth region can be considered to belong to the container. The mouth region can be integral with the container and can include the same material as the container. Depending on the container, the mouth region can have an inner diameter of 0.1 cm to 10 cm, for example 1.5 cm to 6 cm. In the case of a barrel, the mouth region can have an inner diameter of up to one meter.

[0008] The mandrel can be arranged in the opening of the mouth region already during the formation of the opening, or even contribute to the formation of the opening, or alternatively can be inserted into the opening only after the formation of the opening.

[0009] The mouth area can be regarded as an original version of the mouth. The original version may, for example, not include threads, support rings and / or snap elements. It can be formed and pressed, for example, by means of the structure of the mold, i.e., forming threads, support rings and / or snap elements.

[0010] Implementing a relative movement may mean that the mold may be designed to be movable by means of a displacement device, whereas the mandrel may be designed to be stationary.

[0011] Alternatively, implementing the relative movement may mean that the mandrel may be designed to be movable by means of a displacement device, while the mold may be designed to be stationary. The mandrel may, for example, be designed in multiple parts, one or several of which may be designed to be movable.

[0012] Alternatively, it can be provided that the relative movement can mean that both the mold and the mandrel can be designed to be movable by means of a displacement device. The mandrel can be designed to be multi-part, one or several of which can be designed to be movable.

[0013] For forming and pressing the mouth, the distance between the mold and the mandrel can be reduced by means of a moving device. It can be provided that the moving device for implementing the relative movement between the mold and the mandrel can further be designed to increase the distance between the mold and the mandrel. For example, after the mouth is made by forming and pressing, the mold and the mandrel can be moved away from each other so that the mouth arranged between the two can be removed. It can be provided that the mandrel can be extracted from the opening of the mouth after the mouth is made. The opening of the mouth can correspond to the opening of the mouth area, which can be formed by forming and pressing with the help of the mold and the mandrel.

[0014] For forming and pressing, the mold and the mandrel can cooperate functionally in such a way that the mouth area arranged between them can be produced as a mouth. The pressure during pressing can be 10000 N / m 2 (0.1 bar) to 100000000 N / m 2 (1000bar), for example, 100000N / m 2 (1 bar) to 10000000 N / m 2 (100 bar), or for example 500000 N / m 2 (5bar) to 5000000N / m 2 (50bar) range.

[0015] The mold can be designed as one-piece or multiple parts. Correspondingly, the structure can be designed as one-piece or multiple parts.

[0016] For example, to form and press a mouth portion having a circular cross-section, the mandrel and die may include a substantially cylindrical cross-section.

[0017] The structure may comprise a thread to be formed and / or a support ring and / or a negative mold of a snap-fit ​​element to be formed.

[0018] The relative movement may include movement of the mold in a direction toward the mandrel or in a direction away from the mandrel. The movement may be arranged to be radial in a direction toward the mandrel or radial in a direction away from the mandrel. In this case, radial may mean relative to the longitudinal axis of the mandrel.

[0019] The relative movement may include movement of the mandrel in a direction toward the mold or in a direction away from the mold.

[0020] The mandrel may include a flat side. For example, the flat side may be a side of a cylinder. When the relative movement between the mold and the mandrel is performed by means of a moving device to reduce the distance between the mold and the mandrel, the mold including the structure may contact the mouth area and the mouth area may be pressed against the flat side, so that the mouth can be formed and pressed.

[0021] The mandrel may comprise at least two radially movable jaws with flat side segment surfaces, wherein for example two radially movable jaws may be provided, each of which may comprise a cylindrical segment of approximately 180°, or wherein for example four radially movable jaws may be provided, each of which may comprise a cylindrical segment of approximately 90°. It is also conceivable that three jaws, each of approximately 120°, are provided. In order to ensure the relative mobility of the jaws, they may each extend (over their entire height) to a degree that is less than 360° / (number of jaws) of the circumference (for example 0.05° to 5° less).

[0022] In an alternative embodiment, the jaws can partially overlap in the circumferential direction at least at their edges. The overlap can be designed to be zipper-like, for example by means of several protrusions along the height. In this way, a protrusion of one jaw can be inserted between protrusions of an adjacent jaw. This can result in at least one jaw, for example all jaws, extending in the circumferential direction by more than 360° / (number of jaws). For example, three jaws can be provided, each of which extends in the circumferential direction by 125°.

[0023] The radially movable jaws can be moved, for example, radially away from the longitudinal axis of the mandrel in order to form and press the mouth.

[0024] When the relative movement between the mold and the mandrel is performed by the moving device to reduce the distance between the mold and the mandrel, the movable jaws can contact the mouth area and press the mouth area against the mold, so that the mouth can be formed and pressed.

[0025] It may happen that parts of the mouth area can be contacted by one of the radially movable jaws without being radially moved away from the longitudinal axis of the mandrel. Therefore, the mandrel can be rotated around its longitudinal axis through an angular range, wherein the angular range may not be equal to the angular size of the cylindrical segment of the jaws. For example, for each angular size of the cylindrical segment of 90°, a rotation of 45°, 135°, 225° or 315° can be provided. By rotating the mandrel, burrs can be avoided in the interior of the mouth. Instead, it can be provided that, after a first forming and pressing process, the radially movable jaws can first be radially moved towards the longitudinal axis of the mandrel, after which the mandrel can be rotated around its longitudinal axis through an angular range, wherein the angular range may not be equal to the angular size of the cylindrical segment of the jaws.

[0026] After the rotation is implemented, the radially movable jaws used to mold and press the mouth can be radially moved away from the longitudinal axis of the mandrel, for example, so that when the relative movement between the mold and the mandrel is implemented with the help of a moving device to reduce the distance between the mold and the mandrel, the movable jaws can contact the mouth area and press the mouth area against the mold, so that the mouth can be molded and pressed.

[0027] At least one inclined surface can be provided on the back side of the flat side segment surface, and the mandrel also includes a strut that can be moved parallel to the longitudinal axis of the mandrel, wherein the at least one inclined surface and the strut together can cause a radial movement of the radially movable jaws. The radially movable jaws can be moved radially away from the longitudinal axis of the mandrel by the at least one inclined surface and the strut together, for example, to form and press the mouth. When the relative movement between the mold and the mandrel is carried out by means of the movement device to reduce the distance between the mold and the mandrel, the movable jaws can contact the mouth area and press the mouth area against the mold, so that the mouth can be formed and pressed. As mentioned above, it can also be provided to rotate the mandrel around its longitudinal axis.

[0028] The spindle may include hydraulic means cooperating with the radially movable jaws to cause radial movement of the radially movable jaws.

[0029] The mandrel may comprise a toggle lever, at least one toggle lever per radially movable jaw, wherein the interaction of the at least one toggle lever and the radially movable jaw can cause a radial movement of the radially movable jaw. The interaction of the mouth region, the jaws and the mould described above also applies here. It can also be provided that the mandrel can be designed to be rotatable about its longitudinal axis as described above.

[0030] The device may further comprise rotation means for effecting a rotation of the mandrel about its longitudinal axis.

[0031] A method for forming and pressing the mouth of a container comprising fibers, such as pulp, for example using an apparatus as described above or below, comprising: providing a container comprising fibers, such as pulp, having a mouth area, the mouth area comprising an opening, in which a mandrel is at least temporarily arranged; for example inserting the mandrel into the opening; surrounding at least the outer surface of the mouth area of ​​the container where the mouth is to be formed with a mold; and implementing a relative movement between the mold and the mandrel by means of a moving device to reduce the distance between the mold and the mandrel and thereby forming and pressing the mouth.

[0032] Implementing relative movement to reduce the distance may include:

[0033] - radially moving the mould in the direction of the mandrel, for example in the direction of the longitudinal axis of the mandrel, with the central axis being stationary, by means of a moving device, or

[0034] - moving the mandrel in a direction towards the mould, for example radially away from the longitudinal axis of the mandrel, by means of a moving device, wherein the mould is stationary, or

[0035] - moving the mould by means of the moving device in a direction towards the mandrel, for example radially in a direction towards the longitudinal axis of the mandrel, and moving the mandrel by means of the moving device in a direction towards the mould, for example radially away from the longitudinal axis of the mandrel.

[0036] Furthermore, since the method uses the device, the features mentioned with respect to the device in connection with carrying out the relative movement for reducing the distance also apply to the method.

[0037] Furthermore, the method may comprise moving the radially movable jaws of the mandrel away from the longitudinal axis of the mandrel. This applies to an embodiment of the device in which the mandrel may comprise at least two radially movable jaws with flat side segment surfaces, as described further above. Since the method uses the device, features already made in connection with the device with respect to the mandrel with radially movable jaws also apply to the method.

[0038] The method may further include rotating the mandrel through an angular range. For example, it may be configured to move the radially movable jaws of the mandrel toward the longitudinal axis of the mandrel before the rotation. It may be configured to move the radially movable jaws of the mandrel away from the longitudinal axis of the mandrel after the rotation.

[0039] Here, the features already mentioned in connection with the device also apply to the method.

[0040] The method may also include, for example, after forming and pressing the mouth, moving the mold away from the longitudinal axis of the mandrel and / or, when the mandrel comprises radially movable jaws, moving the radially movable jaws of the mandrel towards the longitudinal axis of the mandrel. Thus, the mold and / or the radially movable jaws can be moved out of the mouth area or the formed and pressed mouth. The container comprising fibers, such as pulp, with the formed and pressed mouth can then be supplied, for example, to further processing steps.

[0041] The mandrel can be designed to transport and / or grip the mouth after forming, including the rest of the container, i.e. the entire container, if appropriate. Thus, the mouth can be taken over by other handling devices, for example. When gripping or transporting, the jaws can exert less pressure.

[0042] During the pressing, as much of the liquid fraction as possible of the fibers, for example pulp, can be pressed out, so that the mouth has only a low residual moisture content.

[0043] The mouth may include one, several or all of the following molded parts:

[0044] -Support ring for transporting containers in neck handling;

[0045] - a closing ring for the locking ring of the snap-on closure;

[0046] - a thread for unscrewing the closure;

[0047] - Characters, for example in the form of numbers, marking the die or mandrel used when pressing the mouth.

[0048] For example, the apparatus may have a large number of similar moulds and mandrels so that a large number of mouths may be produced simultaneously.

[0049] In addition to the above-mentioned mold according to the present invention, the device can also include pre-forming molds, in which the basic molded parts of the mouth to be formed are formed (without such high pressure), and then the basic molded parts can be transported to the above-mentioned mold by a handling device. Alternatively, the mouth to be formed in the mold according to the present invention can be formed by an unformed, fiber-containing substance.

[0050] Furthermore, the device may also comprise a mixer, with which the substance (eg pulp) can be produced. The device may have a pump, with which the substance can be pumped to the mould.

[0051] The mold and / or the mandrel may have holes through which the extruded liquid can escape. The holes may be holes or pores in the material of which the mold and / or the mandrel at least partially consists. Furthermore, channels for venting the liquid may be arranged within the mandrel and / or the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] For better understanding and description, the accompanying drawings exemplarily show aspects and / or embodiments of the present utility model.

[0053] Figure 1 shows a schematic half longitudinal section of a first embodiment of a device for forming and pressing a mouth of a container comprising fibers;

[0054] Figure 2 shows a schematic partial longitudinal section of a second embodiment of a device for forming and pressing a mouth of a container comprising fibers;

[0055] Figure 3A A schematic overhead view of a first arrangement of dies and mandrels for forming and pressing the mouth portion is shown;

[0056] Figure 3B A schematic overhead view showing a second arrangement of the die and mandrel for forming and pressing the mouth portion;

[0057] Figure 3C A schematic overhead view showing a third arrangement of dies and mandrels for forming and pressing the mouth portion;

[0058] Figure 3D A schematic overhead view showing a fourth arrangement of dies and mandrels for forming and pressing the mouth portion;

[0059] Figure 4 a schematic half longitudinal section showing a second embodiment of the device for forming and pressing the mouth of a container comprising fibers in a first arrangement;

[0060] Figure 5 A schematic half longitudinal section of a second embodiment of the device is shown in a second arrangement. DETAILED DESCRIPTION

[0061] Figure 1 A schematic half longitudinal section of a first embodiment of an apparatus for forming and pressing a mouth 13 of a container 12 comprising fibers, such as pulp, is shown.

[0062] In this cross-sectional view, the mandrel 1 comprises a radially movable jaw 6 with a flat side section surface 7, on the back of which two inclined surfaces 8, 9 are arranged, which are arranged one above the other when viewed along the longitudinal axis 2 of the mandrel 1. In this cross-sectional view, the mandrel 1 also comprises a strut 3 that can be moved parallel to the longitudinal axis 2 of the mandrel 1. The surface of the strut 3 facing the jaw 6 comprises two recesses 4, 5, which are arranged one above the other when viewed along the longitudinal axis 2 of the mandrel 1. In the process of moving the strut 3 parallel to the longitudinal axis 2 in the direction 14 into the interior of the container 12, the combined effect of the inclined surfaces 8, 9 and the recesses 4, 5 causes a radial movement of the radially movable jaw 6 in the direction toward the mold 10. Alternatively, the recesses 4, 5 can also have inclined surfaces or rolling bodies for rolling on the inclined surfaces (not shown). In another alternative that is not shown, the mandrel 1 can only include rolling bodies, recesses or inclined surfaces at one height. Two, three or more rolling bodies, recesses or inclined surfaces may be arranged in the circumferential direction.

[0063] A mold 10 including a structure 11 for molding a mouth 13 surrounds at least the outer surface of a container 12 on which the mouth 13 is to be formed.

[0064] By radially moving the jaws 6 in the direction of the mold 10, the distance between the jaws 6 and the mold 10 is reduced and the mouth area of ​​the container 12 can be pressed against the structure 11 of the mold and thus the mouth 13 can be formed or finished. The rest of the container 12 is not necessarily connected to the mouth in this state.

[0065] Guides 72 , 73 for moving the jaws can be seen above and below the jaws 6 .

[0066] In this cross-sectional view, the two threads 64, 65 of the mouth 13 can be seen, as well as the closing ring 66 and the supporting ring 67 of the mouth 13. In a subsequent processing step, an anti-tampering ring of the closure can be placed between the closing ring 66 and the supporting ring 67, which can be at least partially separated from the rest of the closure when the closed container 12 is unscrewed.

[0067] Figure 2 A schematic partial longitudinal section of a second embodiment of a device for forming and pressing a mouth 13 of a container 12 comprising fibers, such as pulp, is shown.

[0068] In this cross-sectional view, the mandrel 15 comprises a radially movable jaw 21 with a flat side section surface 20, and a rod 17, to which two toggle levers 18, 19 are connected. In a process in which the rod 17 is moved in a direction 22 into the interior of the container 12 parallel to the longitudinal axis 16 of the rod 17, the toggle levers 18, 19 cooperate with the jaw 21 to cause a radial movement of the radially movable jaw 21 in the direction toward the mold 10.

[0069] By radially moving the jaws 21 in the direction of the mold 10, the distance between the jaws 21 and the mold 10 is reduced and the mouth area of ​​the container 12 can be pressed against the structure 11 of the mold 10 and thus the mouth 13 can be formed or finished. Guides 74, 75 for the movement of the jaws can be seen above and below the jaws 21.

[0070] The mold 10 and the structure 11 correspond to Figure 1 The molds and structures in.

[0071] In this cross-sectional view, the two threads 68, 69 of the mouth 21 can be seen, as well as the closing ring 70 and the support ring 71 of the mouth 13. In a subsequent processing step, an anti-tampering ring of the closure can be placed between the closing ring 70 and the support ring 71, which can be at least partially separated from the rest of the closure when the closed container 12 is unscrewed.

[0072] Figure 3A A schematic top view of a first arrangement of a mold and a mandrel for forming and pressing a mouth is shown. The mold comprises two parts 23, 24, which surround a mouth 25 of a container comprising fibers such as pulp. For the sake of clarity, only four exemplary radially movable jaws 26, 27, 28, 29 of the mandrel are shown.

[0073] The radial movement of the jaws 26-29 can be achieved, for example, by Figure 1 and 2 The elements of the embodiments shown in FIG. Figure 3A In the embodiment of the present invention, the jaws 26-29 are radially moved away from the longitudinal axis 34 of the mandrel. The distance between the die and the jaws 26-29 can thereby be reduced, so that the mouth 25 can be formed by pressing against the structure of the die (not shown).

[0074] The portion of the mouth 25 that is not contacted by the four jaws 26-29 by radial movement away from the longitudinal axis 34. Therefore, the mandrel can be rotated around its longitudinal axis by an angular range, wherein the angular range may not be equal to the angular size of the cylindrical segments of the jaws 26-29. By rotating the mandrel, burrs on the interior of the mouth 25 can be avoided.

[0075] Figure 3B A schematic top view of a second arrangement of the die and mandrel for forming and pressing the mouth 25 is shown. The radial movement of the jaws 26 to 29 away from the longitudinal axis 34 has been stopped and the mandrel has been rotated 45° clockwise 35 about the longitudinal axis 34.

[0076] Generally speaking, the inner mold and / or outer mold 1, 23, 24, 26-29 can be rotated by an angle relative to the mouth 13, 25 to be formed between two pressing processes, and the angle is designed so that in the second pressing process, one mold part abuts such a position, which is arranged between the two mold parts in the first pressing process.

[0077] Figure 3C A schematic top view of a third arrangement of the die and mandrel for forming and pressing the mouth is shown. After the 45° clockwise rotation 35 around the longitudinal axis 34 is completed, the jaws 26-29 are radially moved away from the longitudinal axis 34 again and the mouth 25 can be formed by pressing against the structure of the die again.

[0078] The position of the two parts 23, 24 of the mould does not change.

[0079] Figure 3D A schematic top view of a fourth arrangement of the die and mandrel for forming and pressing the mouth is shown. After forming and pressing the mouth 25, i.e., after the mouth is made, for example, one part 23 of the die can be radially moved in a direction 48 away from the longitudinal axis 34, and another part 24 of the die can be radially moved in a direction 49 away from the longitudinal axis 34 to form a certain distance from the mouth 25. In addition, the jaws 26-29 can each be radially moved in a direction 44, 45, 46, 47 towards the longitudinal axis 34 to also form a certain distance from the mouth 25. Figure 3D Also visible are the flat side segment surfaces 40, 41, 42, 43 of the respective jaws 26-29.

[0080] If the threads are to be molded by a rotating die or a rotating mandrel, the FIG. 3A to FIG. 3D However, people can correspondingly replace this (these) mold or mandrel with other mold or mandrel to carry out the second pressing process.

[0081] Figure 4 A schematic half longitudinal section of a second embodiment of an apparatus for forming and pressing a mouth of a container 52 comprising fibers, such as pulp, in a first arrangement is shown. A mandrel 50 having a flat side surface 58 surrounding a longitudinal axis 51 is placed in the container 52. A mold 54 comprising a structure 55 for forming a mouth surrounds at least the outer surface of a mouth region 53 of the container 52 to be formed with the mouth. In the first arrangement shown, the mold 53 is at a distance from the outer surface of the mouth region 53. In this case, the mold 53 is arranged in a mold extension 59. In the illustration, the mold extension 59 extends around the mouth region 53 and a portion of the neck region of the container 52. Alternatively, the mold extension 59 can also extend to the bottom of the container 52 (not shown).

[0082] Figure 5 A schematic half longitudinal section of a second embodiment of the device in a second arrangement is shown. The mold 54 is moved in a direction 56 radially toward the longitudinal axis 51, whereby the distance between the mold 54 and the mandrel 50 is reduced, and the mouth region 53 of the container 52 (see Figure 4 ) is pressed against the structure 53 of the mold 54, and the mouth portion 57 can thus be formed or completed.

[0083] In the illustration of the half longitudinal section, the two threads 60, 61 of the mouth 57 as well as the closing ring 62 and the supporting ring 63 of the mouth 57 can be seen. In a subsequent processing step, a tamper-proof ring of the closure can be placed between the closing ring 52 and the supporting ring 63, which can be at least partially separated from the rest of the closure when the closed container 52 is unscrewed.

Claims

1. A device for forming and pressing the mouth of a container comprising fibers, characterized in that The device comprises: - a mold (10, 54) for surrounding at least the outer surface of a mouth region (53) of the container (12, 52) where the mouth (13, 25, 57) is to be formed, wherein the mold (10, 54) has a structure (11, 55) for molding the mouth (13, 25, 57); - a mandrel (1, 15, 50) intended to be inserted into the opening, at least temporarily within the mouth region (53); - a moving device for carrying out a relative movement between the mold (10, 54) and the mandrel (1, 15, 50) so as to reduce the distance between the mold (10, 54) and the mandrel (1, 15, 50) and thus to shape and press the mouth (13, 25, 57).

2. The device according to claim 1, characterized in that The structure (11, 55) comprises a negative mold of a thread to be formed and / or a support ring and / or a snap-fit ​​element to be formed.

3. The device according to claim 1 or 2, characterized in that: The relative movement includes movement of the mold (10, 54) in a direction toward the mandrel (1, 15, 50) or in a direction away from the mandrel (1, 15, 50).

4. The device according to claim 1 or 2, characterized in that: The relative movement includes movement of the mandrel (1, 15, 50) in a direction toward the mold (10, 54) or in a direction away from the mold (10, 54).

5. The device according to claim 1 or 2, characterized in that: The mandrel (1, 15, 50) includes flat sides.

6. The device according to claim 1 or 2, characterized in that: The mandrel (1, 15) comprises at least two radially movable jaws (6, 21, 26, 27, 28, 29) having flat side segment surfaces (58).

7. The device according to claim 6, characterized in that Two radially movable jaws are provided, each comprising a 180° cylindrical section.

8. The device according to claim 6, characterized in that Four radially movable jaws (26, 27, 28, 29) are provided, each of which comprises a 90° cylindrical section.

9. The device according to claim 6, characterized in that At least one inclined surface (8, 9) is respectively arranged on the back side of the flat side segment surface, and the spindle (1) also includes a support rod (3) that can move parallel to the longitudinal axis of the spindle (1), wherein the combined action of the at least one inclined surface (8, 9) and the support rod (3) can cause radial movement of the radially movable jaw (6).

10. The device according to claim 6, characterized in that The spindle (1, 15) comprises a hydraulic device, which acts together with the radially movable jaws (6, 21, 26, 27, 28, 29) to cause radial movement of the radially movable jaws (6, 21, 26, 27, 28, 29).

11. The device according to claim 6, characterized in that The spindle (15) comprises a toggle rod (18, 19), each radially movable jaw (21) being connected to at least one toggle rod (18, 19), wherein the joint action of the at least one toggle rod (18, 19) and the radially movable jaw (21) can cause radial movement of the radially movable jaw (21).

12. The device according to claim 1 or 2, characterized in that The device also comprises rotation means for effecting a rotation of the spindle about its longitudinal axis (34).

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