METHOD TO FORM A STACKING SHOULDER INTO THE SIDEWALL OF A CUP WITH A ROTATING TOOL

Abstract

The present invention relates to a method for the production of a container having a bottom and a first sidewall attached to the bottom, wherein a stacking shoulder is formed into the first sidewall by means of a form tool and a mandrel, wherein the form tool reciprocates along its center axis from a remote position to a forming position.

Claims

1.-10. (canceled)

10. A container produced by a process comprising the steps of: providing a form tool and a mandrel; providing a first sidewall of said container around said mandrel; moving said form tool from a remote position away from said first sidewall to a forming position around a lower portion of said first sidewall to form a stacking shoulder into said first sidewall; and rotating said form tool around a central axis at least temporarily during the forming of said stacking shoulder.

11. A system for producing a container having a bottom, a first sidewall attached to said bottom and a stacking shoulder formed into said first sidewall, said system comprising: a mandrel having a cylindrical shape and a forming means provided on an outer surface of said mandrel, said mandrel being configured to generally conform to a lower portion of said first sidewall of said container; and a form tool having a cylindrical shape and an opening providing an inner surface generally conforming to said first sidewall of said container, said form tool comprising a forming means on said inner surface corresponding to said forming means on said mandrel and configured to form said stacking shoulder into said first sidewall; wherein said form tool is configured to selectively move between a remote position and a forming position where said form tool is positioned around a lower portion of said first sidewall; wherein said form tool is configured to rotate while in said forming position.

12. The system of claim 11, wherein said forming means on said form tool comprises a step.

13. The system of claim 11, wherein said forming means on said mandrel comprises an indentation.

14. The system of claim 11, wherein said forming means of said form tool extends around an entire circumference of said inner surface of said form tool.

15. The system of claim 14, wherein said forming means of said mandrel extends around an entire circumference of said outer surface of said mandrel.

16. The system of claim 11, wherein said form tool is configured to continuously rotate while in said forming position.

17. The system of claim 16, wherein said mandrel is rotationally static when said form tool is in said forming position.

18. The system of claim 11, wherein said mandrel is configured for having a blank of material wrapped around said mandrel to form said first sidewall of said container.

19. The system of claim 18, wherein said first sidewall of said container includes an overlapping side seam formed by wrapping said blank of material around said mandrel, wherein said form tool rotates in a direction against an outer edge of said side seam when in said forming position.

20. The system of claim 11, wherein said form tool plastically deforms said first sidewall of said container to form said stacking shoulder when said form tool is positioned in said forming position.

Description

DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

[0017] The inventions are now described in further detail according to FIGS. 1 to 5. These explanations do not limit the scope of protection. The description applies to all subject matters of the present invention likewise.

[0018] FIG. 1 is a fragmentary sectional side view of two cups stacked together in accordance with one embodiment of the present invention;

[0019] FIG. 1A is an enlarged sectional view of a portion of the cups in balloon A of FIG. 1;

[0020] FIG. 2 is a fragmentary sectional side view of two cups stacked together in accordance with another embodiment of the present invention;

[0021] FIG. 2A is an enlarged sectional view of a portion of the cups in balloon B of FIG. 2;

[0022] FIG. 3A is a partial side perspective view of a mandrel in accordance with one embodiment of the present invention;

[0023] FIG. 3B is a side perspective view of a form tool in accordance with one embodiment of the present invention;

[0024] FIG. 4A is a sectional side perspective view of a form tool, mandrel and cup, illustrating the form tool moving from a remote position to a forming position in accordance with one embodiment of the present invention;

[0025] FIG. 4B is a sectional side perspective view of a form tool, mandrel and cup, illustrating the first sidewall of the cup being deformed in accordance with one embodiment of the present invention;

[0026] FIG. 4C is a sectional side perspective view of a form tool, mandrel and cup, illustrating the form tool moving from a forming position to a remote position in accordance with one embodiment of the present invention; and

[0027] FIG. 5 is a partial schematic sectional view of a cup first sidewall illustrating an overlapping side seam in accordance with one embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0028] The invention will now be described with reference to the drawing figures, in which like reference numerals refer to like parts throughout. For purposes of clarity in illustrating the characteristics of the present invention, proportional relationships of the elements have not necessarily been maintained in the drawing figures.

[0029] The following detailed description of the invention references specific embodiments in which the invention can be practiced. The embodiments are intended to describe aspects of the invention in sufficient detail to enable those skilled in the art to practice the invention. Other embodiments can be utilized and changes can be made without departing from the scope of the present invention. The present invention is defined by the appended claims and the description is, therefore, not to be taken in a limiting sense and shall not limit the scope of equivalents to which such claims are entitled.

[0030] FIGS. 1 and 2 show two cups 1 stacked together; i.e. one cup is inserted into another cup. Each cup comprises in the present case a first, here inner sidewall 3, which is optionally provided with a rolled rim 2 at its upper edge. At the opposite edge, a bottom 6 is connected to sidewall 3, for example by gluing and/or sealing. The inner sidewall 3 is produced from a blank, which is rolled around a mandrel and hence brought into its here conical shape. As can be particularly seen from FIG. 5, two edges of the sidewall 3, which overlap, are connected to each other by a side seam 14. Around the first sidewall 3 a second sidewall 4 may be provided. This second sidewall 4 may be smaller, i.e. comprises a smaller axial extension than the first sidewall. The second sidewall can comprise a 3-dimensional shape, so that air gaps may be formed between the first and the second sidewall. As already mentioned, particularly during transportation and prior to their use the cups 1 are stacked together; i.e. one cup is inserted into another cup. In order to improve destacking prior to use, the first sidewall 3 comprises a stacking shoulder 5 on which here the sidewall of the inserted cup rests. In one embodiment, the second sidewall 4 rests partially on the stacking shoulder 5 and consequently limits the extent by which the upper cup can be inserted into lower cup and hence improves destacking. Contrary to the embodiment according to FIG. 1, in the embodiment according to FIG. 2, the second sidewall may rest entirely on the stacking shoulder 5.

[0031] FIG. 3B shows the form tool 7, which is utilized to insert the stacking shoulder 5 into the first sidewall 3. In the present case, this form tool 7 may be provided with a continuous, circular shape. As can be particularly seen from FIG. 3B, on its inner surface, the form tool 7 comprises forming means 8, here in the shape of a step, which cooperates with a corresponding forming means at the mandrel 9, as can be seen from FIG. 3A and thus forms the stacking shoulder 5. The step 8 extends around the entire circumference of the inner circumference of the form tool 7.

[0032] Reference is now made to FIGS. 4A-4C, which shows the three productions steps for the formation of the stacking shoulder 5 according to one embodiment of the present invention. As already mentioned, for the formation of a stacking shoulder 5, a mandrel 9 is provided, which can be stationary and around which the material of the first sidewall 3 is wrapped. This mandrel 9 comprises at its lower end means 10; here an indentation, which is utilized to form the stacking shoulder 5. The indentation 10 typically extends continuously around the entire outer circumference of the mandrel 9. In a first step, depicted in FIG. 4A, the form tool 7 is displaced from the depicted remote position to its forming position, which is depicted in FIG. 4B. In this position, the forming means 8 of the form tool 7 cooperate with the forming means 10 of the mandrel 9 and hence deform the sidewall 3 of the cup plastically, so that it comprises the stacking shoulder 5. As depicted by arrow 11, the form tool 7 rotates at least while it is in its forming position. However, it will be appreciated, that the forming tool 7 may rotate continuously, even in its remote position. In one embodiment, the speed of rotation is between about 600 and about 800 rpm. The forming tool 7 may remain in its forming position only for a very small period of time and is then moved back into its remote position as depicted in FIG. 4C.

[0033] FIG. 5 shows schematically the first sidewall 3 and its overlap region 12, in which the edges of the sidewall 3 are attached to one another by the seam 14. Also shown schematically is the rotation of the form tool 7 depicted by arrow 11. It can be clearly seen, that according to an embodiment of the inventive method, the direction of rotation, here clockwise, is against the outer edge 13 of the side seam 14.

[0034] From the foregoing, it will be seen that this invention is one well adapted to attain all the ends and objects hereinabove set forth together with other advantages which are obvious and which are inherent to the structure. It will be understood that certain features and sub combinations are of utility and may be employed without reference to other features and sub combinations. This is contemplated by and is within the scope of the claims. Since many possible embodiments of the invention may be made without departing from the scope thereof, it is also to be understood that all matters herein set forth or shown in the accompanying drawings are to be interpreted as illustrative and not limiting.

[0035] The constructions and methods described above and illustrated in the drawings are presented by way of example only and are not intended to limit the concepts and principles of the present invention. Thus, there has been shown and described several embodiments of a novel invention. As is evident from the foregoing description, certain aspects of the present invention are not limited by the particular details of the examples illustrated herein, and it is therefore contemplated that other modifications and applications, or equivalents thereof, will occur to those skilled in the art. The terms having and including and similar terms as used in the foregoing specification are used in the sense of optional or may include and not as required. Many changes, modifications, variations and other uses and applications of the present construction will, however, become apparent to those skilled in the art after considering the specification and the accompanying drawings. All such changes, modifications, variations and other uses and applications which do not depart from the spirit and scope of the invention are deemed to be covered by the invention which is limited only by the claims which follow.