HK1180289B - Container made of a paper material and device for producing a container made of a paper material - Google Patents

Description

The invention relates to a paper cup with a refillable interior, formed by means of a coat at least partially conical and a bottom, the bottom of which is essentially watertightly connected to the interior at the lower end of the coat, the coat being formed by a flat cross-section, the front sides of which are connected in an overlap area, and the inner coat having at least one contour in the perimeter.

The cup is known from German publication DE 10 2004 056 932 A1 as a cup made of a paper material as defined in claim 1. The cup has a circular structure above the ground, formed as a so-called stacked shoulder, designed to hold, when several cups are stacked, the ground roll of an outer shell of the upper cup. The structure is circular around the circumference of the inner cup's mantle and is formed by suspending a ring-shaped stamp, while the inner side of the inner cup is already supported by a spine. The structure is placed on the outer cup, already in a mould, in a mould, which is connected to the inner edge of the inner mantle by a liquid forming a mould.

In the case of a cup with a circular shape, a spindle is placed inside the inner cup by means of a ring-shaped stamp, so that a point on the spindle with a reduced outer circumference is placed adjacent to the area of overlap. In the area of overlap, the spindle placed inside the inner cup thus has a saving to allow the formation of the double thickness of the material in the upper area of overlap when the stack is formed. This allows the spindle to be formed on the outer spindle of the inner cup, the material to be stacked in this area is connected without any overlap. The spindle is placed on the ground without a liquid layer, which is essentially a liquid layer, and thus already in the form of a liquid mantle, on the top of the ground, which is already in the form of a liquid mantle.

The area of overlap is critical when the rolling stock is strongly marked or when using low cost and less malleable materials and leaks may occur in the area of this overlap.

The purpose of the invention is to specify an improved paper cup and an improved method for making such a cup.

According to the invention, this is achieved by means of a cup made of paper material with a filling interior, formed by means of a coat and a bottom at least partially conical, whereby the bottom is connected to the coat at the lower end of the interior with a substantially fluid-tight surface, whereby the coat is formed by a flat cross-section, the front sides of which are connected to each other in an overlap area, and whereby the coat enclosing the interior is at least woven in a perimeter pattern, in which the pattern in the overlap area is not formed.

Surprisingly, by saving the forming or the stacking shoulders in the area of the side seam, i.e. the area of overlap, an improved cup made of paper material can be realized by avoiding leaks in the area of this side seam. This is because in this area of overlap there is no deformation. It can be ensured that the side seam does not open again and the front sides of the coat do not separate again in the area of overlap.

In the continuation of the invention, the pattern extends over the entire circumference of the coat, except for the area of overlap.

In this way the forming can serve as a means of holding another cup and, since the forming is present over the entire circumference of the mantle, with the exception of the area of overlap, very good stacking properties can be achieved.

In the continuation of the invention, the form is curved or deflected adjacent to the area of overlap, with the form, when viewed in the direction of the area of overlap, curved or deflected to either side of the area of overlap towards the bottom of the cup.

Such a curved or curved course of the forming on either side of the area of overlap allows material stresses due to the special structure of the paper material used for cups to be largely avoided or controlled so that they do not lead to irregularly deformed cups. The forming thus does not end abruptly in front of the area of overlap but runs curved or curved towards the bottom of the cup. The curved or curved course of the forming helps to avoid areas of too strong deformation in which the paper material could tear.

In the further development of the invention, the moulding is made in the direction of the area of overlap by a curve in perimeter direction at an angle of 90° to the ground.

This allows good stacking characteristics of the forming to be combined with a deformation-free area at the overlap and the avoidance of excessive material deformation.

In further development of the invention, the pattern is curved in a circular arc.

The circular arc of the moulding curved at 90° on the floor helps to avoid material stresses.

In the further development of the invention, a depth of the molding decreases in a radial direction towards the area of overlap.

In this way, the depth of the molding and thus the required material deformation can be gradually reduced towards the overlap.

In the continuation of the invention, an inner diameter of the coat at the height of the casing is smaller than an inner diameter of the coat at the height of the floor.

This allows for excellent stacking properties, with the forming or stacking shoulders protruding so far into the interior that even tolerances in the formation of the upper cup can be compensated, for example in the area of its floor tray used for stacking.

The problem underlying the invention is also solved by a method of producing a cup from paper material using the following steps: shaping a flat cut into a essentially conical mantle and connecting the front sides of the cut together in an overlap area, inserting a pot-shaped floor into the conical mantle so that the surrounding pot wall of the floor is essentially parallel to the inside of the conical mantle and inserting a surrounding formulation into the conical mantle without the area of overlap.

The introduction of the circular form is advantageously done before the mantle is connected to the top of the potting soil under the formation of a soil arch. The mantle is only turned around the bottom edge of the top of the potting soil without a solid connection already existing between the mantle and the top of the potting soil. The turning of the bottom end of the mantle is also called a floor roll and is typically done by moving a groove-shaped stump along the bottom edge of the top of the potting soil. This results in a 180° turning of the mantle under the top of the potting soil, resulting in a constant turning of the mantle beyond the top edge of the potting soil.Alternatively, the coat can be connected exclusively to the outside of the potting wall, so that a wrap of the coat in its lower area is eliminated. So before the coat is connected to the ground firmly and fluid-tightly, shifts and distortions can still be balanced and compensated by inserting the forming, while saving the area of overlap.Surprisingly, the invention now manages to compensate for these greater material shifts in the formation of the mold, while saving the overlap area, by forming the mold when the coat is not yet firmly and fluid-tightly connected to the ground.

In the continuation of the invention, the lower part of the conical mantle is wrapped around the potting wall and the circular forming is introduced essentially simultaneously.

For example, the wrapping of the lower area of the conical coat or the so-called floor roll can be done by driving an inner-shaped stamp to the lower end of the coat. In the direction of the cup, the stamp still has a circular ring, which is then driven against the coat from the outside and forms the molding, saving the area of overlap. The formation of the molding can be done by moving the ring axially against the conical coat, but can also be done, for example, by radially delivering several stamps.

In further development of the invention, the lower region of the conical coat is wrapped and the circular form is inserted by suspending a stamp on the lower region of the conical coat parallel to a median longitudinal axis of the conical coat.

The paper material of the coat does not have to be stretched, but folds more or less inwards, while at the same time the height of the cup between the coat and the bottom edge of the floor is shortened. As already shown, this shortening is unevenly spread over the circumference of the cup, since the area of overlap is saved. The resulting material displacements of the coat can be equalized by the fact that the coated ground or coat is simultaneously folded, but the formation is only determined after the formation of the coat, although the formation is made with the fluidity of the coat, and the formation is then determined with the change in the floor.

The invention is further developed by liquid-tight pressing of the pot wall of the floor and the conical mantle after the insertion of the circular form.

The problem underlying the invention is also solved by a device for performing the procedure of the invention, which has a spindle and a stamp for inserting a mold into a conical cover of a cup of paper material, where the spindle has a perimeter section and the stamp has a ring-shaped part forming the mold, the section being broken in the area of overlap on the cover and/or the ring-shaped part of the stamp is left out in the area of overlap on the cover.

The break of the paragraph at the core in the area of overlap reduces the risk of wrinkling in this area, i.e. at the level of the forming to be applied and in the area of the side stitch/overlap.

Further features and advantages of the invention are given by the claims and the following description of preferred embodiments of the invention in connection with the drawings. Fig. 1a first cut-out view of a cup of the invention made of paper material,Fig. 2a second cut-out view of a cup of the invention, whereby the cut-out plane of Fig. 2 is rotated 90° about the central longitudinal axis of the cup relative to the cut-out plane of Fig. 1,Fig. 3a view of a cup of the invention from above,Fig. 4a first process step in the manufacture of the cup of the invention,Fig. 5a second process step in the manufacture of the cup of the invention,Fig. 6a third process step in the manufacture of the cup according to the invention,Fig. 7a fourth process step in the manufacture of the cup according to the invention,Fig. 8a view of the stamp used in the invention process according to Fig. 7a view of the cup according to the invention process according to Fig. 9a view of the cup according to the invention process after the process step in Fig. 7,Fig. 10a section view of a stamp similar to Fig. 8 from the inside,Fig. 11a view of a spindle used in the invention process according to Fig. 4 from the top,Fig. 12a view of the sections A-A in Fig. 11,Fig. 13a view of a ring on the top of the ring in Fig. 12a view of the rings A-A in Fig. 13a view of Fig. 14a view of the rings A-A in Fig. 15a view of the rings A-A in Fig. 13a view of Fig. 15a view of the rings A-A in Fig. 12a view of the rings A-A in Fig. 15a view of Fig. 15a view of the rings A-A in Fig. 13a view of Fig. 15a view of the rings A-A in Fig. 15a view of Fig. 15a view of the rings A-A in Fig. 15a view of Fig. 15a view of Fig. 15a view of the rings A-A in Fig. 15a view of Fig. 15a view of Fig. 15a view of Fig. 15a view of the rings A-A.13 and Fig. 16 an enlarged representation of the detail X from Fig. 15.

The representation in Fig. 1 shows a cup 10 of the invention made of a paper material. The cup 10 is shown in an incomplete state, since the cup can be fitted with a mouthpiece at its upper edge and an outer coat for insulation and stabilization can be placed on the cup 10.

The cup 10 has a generally conical mantle 12 which is connected to a generally top-shaped floor 16 to form a floor frame 14. To form the floor frame 14, an area of the mantle 12 above the floor 16 or its pot wall is surrounded by the pot wall of the floor 16 and then the mantle 12 and the floor 16 are pressed together and also glued or sealed together in the area of this envelope.

The cover 12 of cup 10 has a circumferential mould 18 which is interrupted only in the right section of cup 10 shown in Fig. 1. This area, shown in Fig. 1, forms the area of overlap 20 in which the front sides of a flat section of which the conical cover 12 is made overlap and are sealed or glued together.

The shape 18 is curved downwards towards the area of overlap, towards the floor 16. The shape 18 is curved towards the area of overlap, first in a perimeter direction, then curved in a circular arc until, after an angle of 90°, the shape 18 runs almost parallel to the area of overlap 20 and ends at a height of 16. A curve of this 90° will affect the shape of the mantle, so that no radial curvature is formed on the surface of the material and no curvature can be maintained on the two sides of the mantle.

However, because the mould 18 extends over the entire circumference of the coat 12, except for the area of overlap 20, it can provide a reliable stacking shoulder for identical cups to be stacked. For example, mould 18 may have the floor roll of an unrepresented outer coat of an upper cup or, for example, the floor frame 14 of a respective upper cup on it.

The form 18 is so strongly formed in the radial direction that an inner diameter at the level of form 18 is smaller than an inner diameter at the level of the floor 16. Above the floor 16 a section joins in a direction to the opening of cup 10 and thus slightly decreases in diameter until form 18 is reached. Such a strong forming of the form in the sense of such a significant reduction in cross-section is not necessarily necessary but can be done. Alternatively, from floor 16 upwards a cylindrical section may extend to form 18 or the section between form 18 and floor 16 may increase in diameter upwards.

The representation in Fig. 3 shows a view of cup 10 from above. The cup 10 has its largest diameter at the upper edge of the generally conical mantle 12. The interior of the cup 10 is closed downwards by the floor 16. The floor arc 14 is not visible in the view of Fig. 3 and is therefore only dashed. The molding 18 runs, as shown in Fig. 3, to encircle the entire mantle 12 with the circumference of the overlap area 20. In the area of the overlap 20 the molding 18 is not formed, so that no deformation occurs in this area.

As shown above, the cup 10 can be finished with a mouth coil on the top of the cover 12 and, for example, a generally conical outer coil can be suspended on the cup 10 and fixed there to improve its insulation properties.

The coat 12 in the form of a cone-stump-shaped beaker is now placed on a 22 axis, which has a generally cone-stump-shaped shape similar to the cone-stump-shaped one. A circle is formed in Fig. 24 through the bottom end of the coat, which is provided with a 24th circle, which runs along the bottom of the bottom of the bowl, as in Section 16 of Section 26 of the present Regulation. The top of the coat is arranged on the bottom of the bowl, which is not in the shape of a circle, and is formed by a circle, as in Section 16 of Section 26.

The coat 12 is then suspended on the spine 22 as shown in Figure 5 until, as shown in Figure 6, a pot face of floor 16 is parallel to an inner face of floor 12. When this condition is reached, a two-piece stamp 28 is moved towards the lower end of the coat 12. A first, pot-shaped part 30 of the two-piece stamp 28 has a circularly formed groove 32 which takes up the lower edge of floor 12 and turns it around 180°, thus reversing the area of the coat 12 edge, which is above the lower edge of the pot face of floor 16 and below the top face of floor 16.The condition of this lower part of mantle 12 after this so-called ground roll is shown in Fig. 7 and Fig. 9. As can be seen, the lower part of mantle 12 is surrounded by the pot face of floor 16, but is only on the outside of the pot face of this one, whereas on the inside there is still a distance between the overturned part of mantle 12 and the pot face of floor 16.

A second part 34 of the 28 stamp is formed in the form of a ring and is intended for the formation of the 18th mould; this second part 34 is pushed simultaneously with the first part 30 of the top shape from below against the mantle 12 which is mounted on the thorn 22. However, an inner diameter of the 34 stamp is approximately the thickness of the paper material of the middle 12 larger than the outer diameter of the 24th circular section of the thorn 22 and thereby presses the 12th coat into the radially outside of the 24th circular section of the thorn 22 and thus forms the mould inside 18. The suspension of the two-part stamp 28 takes place in an axial direction parallel to the 36th of the coat 12 in the middle 12th of the coat 12 in the shape of a ring, so that after the first 12th or 12th round of the coat 12 has been fully rotated, the second part of the coat 12 is placed on the 18th or 12th edge of the coat 12 and the second part of the coat 12 is placed on the 18th or 12th edge of the coat 12 in the middle of the coat 18 and the second part of the coat 12 is placed on the 18th edge of the coat 12 in the middle of the coat 12thorn.

As shown in Figure 8, the inner diameter of the second ring section 34 has a 38 extension, which, when the second ring section 34 of the stamp 28 is raised, radially extends outside the area of overlap on coat 12, ensuring that no deformation occurs in the area of overlap 20 as shown in Figure 7, where in the area of the coat 38 a distance lies between the outside of the coat 12 on the coat 20 and the inner circumference of the ring 34, so that no deformation occurs in the area of overlap 20 on the coat 12 and therefore no deformation occurs.

The diagram in Fig. 10 shows a view of a possible design of slot 38 from the centre-long axis 36. slot 38 of the ring-shaped section 34 of Fig. 8 has straight, essentially perpendicular to the circumference side edges. In the alternative design according to Fig. 10, it can be seen that the side edges 40 of slot 38 are not straight but rather curved in a circular manner, with the width of the slot decreasing from top to bottom. When the second 34 ring-shaped section of the stamp 28 is moved, the formation 18 is thus given a 20 on either side of the overlap area, parallel to the ground, and then curved at an angle of 20° to the ground.

In Figure 9, the cup 10 is then shown in the state after the two-part stamp 28 has been removed from the lower part of the mantle 12 again parallel to the mid-long axis 36 and the thorn 22 has also been removed. In this state, the cup 10 is only partially finished. To make the cup 10 waterproof, the floor cover still needs to be formed by pressing the overturned section of the mantle 12 from the inside against the pot wall of the floor 16 and then the three adjacent layers of the mantle 12 and the floor 16 are welded, pressed and/or sealed together.

The representation in Fig. 11 shows the thorn 22, which was only schematically shown in Fig. 4 to 7, in a view from above.

The cylindrical section 24 of the spine 22 and the paragraph 26 are formed on a ring 50 forming the lower end of the spine 22 and the paragraph 26 does not run over the entire circumference of the ring 50 but is not formed in a sub-area of the circumference, this sub-area being then in the area of overlap 20 on the mantle 12.

Fig. 13 shows the ring 50 in a top view. In a region 52 the paragraph 26 is not formed and the ring 50 therefore has a mantle area in this region corresponding to the section of a mantle area of a cone stump. Section 52 is clearly visible in the view of the cutting plane A-A shown in Fig. 15. The circular cylindrical section 24 is also interrupted in region 52.The formation of the area 52 and the area 54 at the ring 50 is also shown in the figure 14 and the circular area 24 ends at the beginning of the two areas 54 and the area 54 forms a gradual transition to area 52. The provision of area 52 at the thorn 22 can ensure that the formation 18 is not formed in the area of overlap 20 and thus gives the beaker formation shown in Figure 2.

From the figure 13 it can be seen that the width B1 of section 52 is approximately the same as the width of each of the transition sections 54 and this allows a smooth, gradual transition from section 26 and the circular section 24 to section 52. This smooth, gradual transition in turn ensures that during the deformation of the paper material of the coat 12 no excessive material stresses occur or the paper material even tears during the formation of the form 18 as was done, section 52 is located in the process step according to Figures 6 and 7, i.e. the shaping of the form of the outer part of the 38 outer cylinder in the ring-shaped part of the stamp 18, 34 versus 28.

Claims (13)

1. A cup made of paper material and having a fillable interior, which is formed by means of an at least partially conical tubular wall (12) and a bottom wall (16), wherein said bottom wall (16) is joined to said tubular wall (12) in the region of the lower end of said interior in a substantially liquid-tight manner, wherein said tubular wall (12) is formed from a planar blank, whose end regions are bonded to each other in an overlap region (20), and wherein said tubular wall (12) delimiting said interior comprises at least one deforming entity (18) extending in the peripheral direction, characterized in that said deforming entity (18) is not formed in said overlap region (20).
2. The cup made of paper material according to claim 1, characterized in that said deforming entity (18) extends along the entire periphery of said tubular wall (12) with the exception of said overlap region (20).
3. The cup according to claim 1 or 2, characterized in that said deforming entity (18) has a bent or curved extension in the vicinity of said overlap region (20), wherein said deforming entity (18), as seen in the direction toward said overlap region (20), extends respectively on both sides of said overlap region (20) forming a bend or curve directed toward said bottom wall (16) of said cup (10).
4. The cup according to claim 3, characterized in that said deforming entity (18) extends, in the direction toward the overlap region (20) in relation to an extension in the peripheral region, curved through an angle of 90 degrees directed toward said bottom wall (16).
5. The cup according to claim 3, characterized in that said deforming entity (18) is curved to form an arc of a circle.
6. The cup according to any one of the preceding claims, characterized in that a depth of said deforming entity (18) in the radial direction diminishes in a direction toward said overlap region (20).
7. The cup according to claim 6, characterized in that said depth of said deforming entity (18) diminishes down to zero.
8. The cup according to any one of the preceding claims, characterized in that an inside diameter of said tubular wall (12) at the level of said deforming entity (18) is smaller than an inside diameter of said tubular wall (12) at the level of said bottom wall (16).
9. A method for the fabrication of a cup made of paper material, comprising the following steps: shaping a planar blank to a substantially conical tubular wall (12) and joining the end regions of said blank to each other in an overlap region (20), inserting a pot-type bottom wall (16) into said conical tubular wall (12), so that the peripheral pot-shaped wall of said bottom wall (16) rests against the interior surface of said conical tubular wall, and incorporating a peripheral deforming entity (18) in said conical tubular wall except in said overlap region (20).
10. The method according to claim 9, characterized in that the process of wrapping the lower region of said conical tubular wall (12) around said pot-shaped wall and the process of incorporating said peripheral deforming entity (18) take place substantially simultaneously.
11. The method according to claim 9 or 10, characterized in that the process of wrapping the lower region of said conical tubular wall (12) and the process of incorporating said peripheral deforming entity (18) is carried out by pushing a plunger (28) onto said lower region of said conical tubular wall (12) in parallel to a longitudinal center axis (36) of said conical tubular wall (12).
12. The method according to any of claims 9 to 11, characterized by pressing said pot-shaped wall of said bottom wall (16) and said conical tubular wall (12) together in a liquid-tight manner after the step involving the incorporation of said peripheral deforming entity (18).
13. A device for carrying out the method according to any one of claims 9 to 12, comprising a mandrel (22) and a plunger (28) for the purpose of incorporating a deforming entity (18) in a conical tubular wall (12) of a cup made of paper material, wherein said mandrel (22) includes a step (26) extending in the peripheral direction and said plunger (28) includes an annular portion (34) for the purpose of forming said deforming entity, wherein said step (26) of said mandrel (22) is discontinued in the region that comes to rest on the overlapping (20) of said tubular wall (12) of the cup, and said annular portion (34) of said plunger (28) has a recess in the region (52) of said overlapping (20) on said tubular wall (12), characterized in that transition zones (54) adjoin on both sides of said region (52), in which zones said step (26) is configured with an increasing depth away from said region (52) so that said transition zones (54) form a gradually extending transition to the region (52).