EP1776286B1 - Deep drawing method for producing a lid and apparatus therefor - Google Patents
Deep drawing method for producing a lid and apparatus therefor Download PDFInfo
- Publication number
- EP1776286B1 EP1776286B1 EP05773895.7A EP05773895A EP1776286B1 EP 1776286 B1 EP1776286 B1 EP 1776286B1 EP 05773895 A EP05773895 A EP 05773895A EP 1776286 B1 EP1776286 B1 EP 1776286B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- holding
- sleeve
- shell
- moulding tool
- film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D43/00—Lids or covers for rigid or semi-rigid containers
- B65D43/02—Removable lids or covers
- B65D43/0202—Removable lids or covers without integral tamper element
- B65D43/0225—Removable lids or covers without integral tamper element secured by rotation
- B65D43/0231—Removable lids or covers without integral tamper element secured by rotation only on the outside, or a part turned to the outside, of the mouth of the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2543/00—Lids or covers essentially for box-like containers
- B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
- B65D2543/00018—Overall construction of the lid
- B65D2543/00064—Shape of the outer periphery
- B65D2543/00074—Shape of the outer periphery curved
- B65D2543/00092—Shape of the outer periphery curved circular
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2543/00—Lids or covers essentially for box-like containers
- B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
- B65D2543/00018—Overall construction of the lid
- B65D2543/00259—Materials used
- B65D2543/00296—Plastic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2543/00—Lids or covers essentially for box-like containers
- B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
- B65D2543/00342—Central part of the lid
- B65D2543/00351—Dome-like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2543/00—Lids or covers essentially for box-like containers
- B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
- B65D2543/00444—Contact between the container and the lid
- B65D2543/00481—Contact between the container and the lid on the inside or the outside of the container
- B65D2543/00537—Contact between the container and the lid on the inside or the outside of the container on the outside, or a part turned to the outside of the mouth of the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2543/00—Lids or covers essentially for box-like containers
- B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
- B65D2543/00953—Sealing means
- B65D2543/0099—Integral supplemental sealing lips
Definitions
- the invention relates to a thermoforming process for a deep drawing process for producing a first shell and a molding tool for carrying out the method.
- Such containers are used for storing and transporting small parts of any kind, especially food, such as cream cheese, yogurt and the like, and in the latter of salad compositions that are provided with dressing or to which the dressing must be added.
- a non-generic, as produced by injection molding container discloses the US 5,638,976 , The injection molding process has the advantage that the containers can be produced with a large variety of variants in terms of their geometry. The disadvantage of this manufacturing method lies in the comparatively high unit costs in the production.
- the containers are usually disposed of after the consumption of the contents, only particularly inexpensive to be manufactured containers for this purpose in question, which can be produced from a thermoplastic material by deep-drawing.
- a manufactured from a thermoformed plastic material container with two halves screwed against each other is in the US 3,322,262 and US 5,542,532 described.
- the first half is provided with an external thread and the second half with an internal thread.
- This structural design with two complementary matched threads is manufacturing technology but expensive to manufacture.
- the tightness of the screwed together container is realized solely on the threaded connection, which leads to significant unevenness in the unavoidable manufacturing tolerances during deep drawing. This is particularly unacceptable when packaging food.
- a deep-drawing method for making a cup with a thread and a one-piece mold therefor are known DE 10230001 .
- the invention had the object of developing a deep-drawing process, with the manufacturing technology simple way a thread structure can be introduced into a first shell.
- Another subtask is the development of a device for manufacturing the first trays.
- the object is achieved with a deep-drawing process according to claim 1, wherein using a mold with a rotatably mounted holding sleeve and a pivotable to the holding sleeve in the circumferential direction threaded sleeve, initially driven in a starting position of the holding sleeve and threaded sleeve a film on the mold, the Inserted film for forming a first shell in the mold, clamped and molded, the threaded sleeve brought by spindling in an end position and the shell is stripped from the retaining sleeve.
- the method according to the invention is exclusively the shaping process for creating a shell with a thread located thereon, for example a cover shell.
- the film is preferably acted upon from its upper side with compressed air and nestles against the mold.
- the shell is formed with the threads.
- the threaded sleeve is spindled.
- a process understood similar to a nut and a screw wherein the nut is the first shell and the screw is the threaded sleeve.
- the shell is held during the unwinding of the holding sleeve and / or of the film.
- it is possible to fix the first shell exclusively on the film during unwinding, thereby preventing the shell from rotating with the threaded shell.
- this is particularly problematic for switches or thin materials, since the film can not absorb the forces occurring during unscrewing and it comes to deformation of the first shell. For this reason, it is advantageous to counter the first shell at least additionally with the retaining sleeve.
- the shell can be stripped off the retaining sleeve together with the film.
- the film impressed with the first shells is fed to another conventional punching machine and the shells are cut out of the film.
- a qualitatively even more precise concentric shaping can be achieved if the shell is already punched out of the film on the molding tool before the threaded sleeve is unwound.
- the first shell since it is already released from the film composite prior to unwinding, be fixed exclusively on the retaining sleeve against rotation with the threaded sleeve.
- the holding sleeve is provided with a geometric structure which is formed after the forming process complementary in the first shell and allows a positive power transmission.
- the first shell is completely dissolved out of the film, it is a form cutting process.
- the subtask is achieved by a molding tool for producing a first shell with a stationary retaining sleeve and a sleeve rotatable in the circumferential direction from a starting position to an end position threaded sleeve, wherein in the threaded sleeve contours for forming at least two threads are formed.
- An inner punch is advantageously arranged centrally within the holding sleeve.
- the inner punch serves to shape the inner cup-shaped middle part and, in a particular embodiment, can be used alone or together with the holding sleeve in the axial direction. Be displaceable direction. Due to the displaceability, it is possible to lift the first shell relative to the mold after removal of the threaded sleeve and transported away.
- the threaded sleeve is arranged concentrically around the holding sleeve, so that when unwinding the threaded sleeve rotates symmetrically about the holding sleeve.
- the retaining sleeve should be inside and the threaded sleeve outside.
- the retaining sleeve has a sloping wall portion, in which retaining ribs are arranged.
- the retaining ribs can be aligned in the axial or radial direction of the retaining sleeve.
- the retaining ribs should be as perpendicular as possible to the direction of rotation of the threaded sleeve, so that one of the pivoting movement the threaded sleeve on the shell acting torque is absorbed by the retaining ribs.
- a holding device is arranged around the threaded sleeve, with which the film can be clamped outside of the mold and thereby fixed.
- the holding device may comprise, for example, a fixed punching counter and a lowerable holding plate.
- a holding and punching device may be arranged circumferentially around the threaded sleeve.
- the mold cutting can be carried out particularly advantageously with a holding and punching device comprising a stripper plate, a lowerable knife plate and a threaded sleeve surrounding the concentric fixed knife sleeve, wherein the stripper plate and the knife plate are moved vertically.
- a holding and punching device comprising a stripper plate, a lowerable knife plate and a threaded sleeve surrounding the concentric fixed knife sleeve, wherein the stripper plate and the knife plate are moved vertically.
- the knife sleeve between the threaded sleeve and the stripper plate is arranged.
- the film With the help of the lowerable knife plate, the film, after it has moved over the mold, clamped between the blade plate. Following the forming process and after unwinding the threaded sleeve, the latter is moved upwards, thereby shearing off the film with the knife plate.
- the knife sleeve protrudes slightly relative to the stripper plate during the process of the film, so that a step forms in the film in the transition of the stripper plate to the knife sleeve, which serves for sealing during the shaping process.
- the holding and punching device may comprise a fixed punching counter, a lowerable holding plate and a lowerable on the punch counter strip steel blade.
- the steel strip knife is a steel strip which has been sharpened on one or both sides and which is annularly closed in the circumferential direction and is formed on its sharpened underside with recesses for remaining webs remaining.
- the holding plate for holding the film and the strip steel blade are two separate components, so that a worn strip steel blade can be exchanged individually in a simple manner. As a result, particularly favorable production costs are possible.
- vent holes are arranged in the retaining sleeve.
- the mold is pressurized from above with compressed air, so that the film conforms to the forming tool and assumes a shell shape. This nestling is supported by the vent holes. It is also possible to connect to the vent holes a vacuum line and suck the film to the forming tool.
- the threaded sleeve sets a travel distance of 10% to 25% of its circumference between the initial and end positions during demoulding.
- the FIG. 1 shows a first shell in the form of a cover shell 1.
- the cover shell 1 has a convex outwardly arched, cup-shaped central part 3, the peripheral wall 29 merges into a retaining edge 4. Between the cup-shaped central part 3 and the retaining edge 4 is gradually the Reduzierbund 5.
- the peripheral wall 29 is provided with a corrugated structure 30, which is also on the inner side 29 a (see FIG. 4 ).
- the retaining edge 4 is provided with a fastening means 47 in the form of a total of four threads 7a, 7b, 7c, 7d, whose contours both on the inner side 6a (see FIG. 3 ) as well as on the outer side 6b of the retaining edge 4 are formed.
- a fastening means 47 in the form of a total of four threads 7a, 7b, 7c, 7d, whose contours both on the inner side 6a (see FIG. 3 ) as well as on the outer side 6b of the retaining edge 4 are formed.
- the threads 7a, 7b, 7c, 7d for example, designed as a bottom shell 2 second shell (see FIG. 7 ) are attached to the lid shell 1.
- the retaining edge 4 is also surrounded to the outside with a circumferential punching edge 49. This has a larger diameter than the cover shell 1, since this example in the manufacture with a in FIG. 12 described holding and punching device 43 is released from a film 23, wherein the holding and punching device 43 surrounds the cover shell 1 like a sleeve.
- FIG. 2 In the side view of FIG. 2 In particular, the course of the threads 7a, 7b, 7d can be seen.
- the thread 7c is not visible in this view, since it is located on the back of the cover shell 1.
- the four threads 7a, 7b, 7c, 7d project outward and are delimited from one another by thread teeth 17a, 17b, 17c, 17d.
- the thread teeth 17a, 17b, 17c, 17d protrude on the inside 6a (see FIG. 3 ) of the retaining edge 4 inwards and form a running surface for complementary formed elements of the bottom shell 2.
- the elements may, for example, as holding wings 11 a, 11 b, 11 c, 11 d according to FIG. 5 be formed.
- each thread 7a, 7b, 7c, 7d On the inlet side 31 of each thread 7a, 7b, 7c, 7d is in each case a threaded inlet 48, which widens like a funnel in the direction of the inlet side 31 to facilitate picking example of a holding wing 11 a, 11 b, 11 c, 11 d enable.
- the thread teeth lying in the direction of rotation 17a, 17b, 17c, 17d on the inlet side 31 are rounded accordingly.
- All threads 7a, 7b, 7c, 7d run at an acute angle of less than 45 ° against the Reduzierbund 5.
- This area represents a clamping area 32, in which, for example, holding wings 11a, 11b, 11c, 11d with their front edge 12 (see FIG. FIGS. 7 to 10 ) in the assembled state of the lid and bottom pan 1, 2 are fixed.
- FIG. 3 shows in a running through the center of the round cover shell 1 cross section, the course and the dimensioning of the threads 7a, 7b, 7d and the arrangement of the seal 8a formed as a sealing seal.
- the inner diameter 18 of the retaining edge 4 is defined by the clearance between two opposing thread teeth 17a, 17b, 17c, 17d. In the FIG. 3 the inner diameter 18 is determined by the distance between the thread teeth 17b, 17d.
- the inside diameter within two opposite threads 7a, 7b, 7c, 7d is referred to as the nominal diameter 15 of the retaining edge 4. In the FIG. 3 For example, the nominal diameter 15 can be seen between the threads 7b, 7d. The nominal diameter 15 is always greater than the inner diameter 18th
- FIG. 4 shows in an enlarged view the area around the retaining edge 4 corresponding to the cutting plane in FIG. 3 ,
- the thread 7a shown in this view has an inner side 6a open and otherwise largely rectangular profile.
- the Reduzierbund 5 is horizontal and thus is substantially perpendicular to the upper portion 34 a of the cup wall 33 (s. FIG. 9 ). Between the Reduzierbund 5 and the peripheral wall 29 is located the sealing cone 8a, which projects beyond the clamping region 32 in the embodiment shown.
- FIG. 5 is a cover shell 1 without circumferential sealing cone 8a shown.
- This embodiment is provided for bottom shells 2, the opening edge 10 is to be closed with a sealing film.
- a sealing cone 8a which in the assembled state of the cover shell 1 and bottom shell 2 under the opening edge 10 of the bottom shell 2 (see FIG. 7 ) engages would push into the over the opening edge 10 stretched sealing film and is therefore unsuitable for such an embodiment.
- FIG. 5 shown embodiment of the cover shell 1 a total of six threads 7a, 7b, 7c, 7d, 7e, 7f, evenly distributed on the inside 6a (see FIG. 3 ) are arranged.
- Such a cover shell 1 can also be screwed onto a bottom shell 2, not shown, with six retaining wings 11 a, 11 b, 11 c, 11 d.
- FIG. 6 shows a further embodiment of the cover shell 1 with a standing perpendicular to the Reduzierbund 5 cylindrical peripheral wall 29.
- the cup-shaped central part 3 was shown without a central cover.
- a toothing is arranged as a corrugated structure 30.
- the corrugated structure 30 does not extend through the peripheral wall 29.
- the outer side 29b of the peripheral wall 29 has rather a smooth surface. Due to the corrugated structure 30 aligned in the axial direction of the cover shell 1, it is possible to record torques acting on the cover shell 1 in the circumferential direction during the production process via the corrugated structure 30 and a complementary formed forming tool 20.
- FIG. 7 is shown as a second shell, a bottom shell 2, with a slightly conical open but substantially cylindrical cup wall 33, which merges in its upper portion 34a in an opening edge 10.
- the lower portion 34b of the cup wall 33 merges into a more tapered base portion 35.
- On the bottom of the bottom shell 2 is closed with a bottom plate 36 on one side.
- the opening edge 10 of the second shell has a fastening means 47 in the form of a total of four evenly outwardly projecting retaining wings 11 a, 11 b, 11 c, 11 d.
- These retaining wings 11a, 11b, 11c, 11d can be formed into correspondingly formed threads 7a, 7b, 7c, 7d, 7e, 7f, as in FIGS FIGS. 1 to 6 represented, engage and fixed by a rotational movement between the cover shell 1 and bottom shell 2 in the threads 7a, 7b, 7c, 7d, 7e, 7f.
- the fixing takes place on the part of the holding wing 11 a, 11 b, 11 c, 11 d in the usually used right-hand threads at the front edge 12th
- the retaining wings 11 a, 11 b, 11 c, 11 d are located in a plane to each other and close up with the plan edge opening 10 from.
- the distance from the outer edge 14 of a holding wing 11 b to the Au ⁇ enkante 14 of the opposite holding wing 11 d is referred to as full circle diameter 16.
- the full circle diameter 16 is selected to be slightly smaller than the nominal diameter 15 of the cover shell 1.
- the outer diameter 19 of the opening edge 10 is measured outside the holding wings 11 a, 11 b, 11 c, 11 d. So that the cover shell 1 can grip over the base shell 2, the outer diameter 19 is selected to be slightly smaller than the inner diameter 18 of the retaining edge 4 (see FIG FIG. 3 ).
- the symmetrical distribution of the holding wings 11 a, 11 b, 11 c, 11 d is also according to the plan view FIG. 8 to recognize.
- the symmetrical configuration of each holding wing 11a, 11b, 11c, 11d is clear.
- rounded outer edge 14 extend the leading edge 12 and the trailing edge 13 of each holding wing 11 a, 11 b, 11 c, 11 d at the same angle in the direction of the opening edge 10th
- FIG. 9 represents in a side view, the bottom shell 2.
- a conically opening base portion 35 which merges into the substantially cylindrical, only slightly conically opening, cup wall 33.
- this goes into a gegenkonische wall, which in turn closes with the opening edge 10 and the holding wings arranged thereon 11 a, 11 b, 11 c, 11 d.
- the retaining wings 11a, 11b, 11c, 11d have the same material thickness as the opening edge 10.
- the retaining wings 11a, 11b, 11c, 11d also in a horizontal plane with the opening edge 10 lie.
- the retaining wings 11 a, 11 b, 11 c, 11 d can then also have on their underside a ramp-like bevel, approximated to the thread pitch.
- FIG. 10 shows in a plan view of a bottom shell 2 with four radially projecting from the opening edge 10 retaining wings 11 a, 11 b, 11 c, 11 d.
- the retaining wings 11 a, 11 b, 11 c, 11 d have a relation to that in the FIGS. 8 and 9 embodiment shown on an asymmetric shape.
- the leading edge 12 rises steeply in the radial direction. The angle is about 45 to 60 degrees.
- the leading edge 12 closes a uniformly convex curved common outside and Trailing edge 13, 14, which merges directly into the nearest leading edge 12.
- the shell is in this case a lid shell. 1
- a mold 20 in three different functional positions with a previously formed to a cover shell 1 film 23 shows a fragmentary in a cross section the Figure 11 a to 11 c ,
- FIG. 11 a are an inner punch 39, a holding sleeve 21 and a threaded sleeve 22 in an initial position to each other.
- the threaded sleeve 22 surrounds the outside of the retaining sleeve 21 and the inner punch 39, both of which are arranged rotationally fixed in the mold 20.
- the threaded sleeve 22 is pivotally mounted about the retaining sleeve 21.
- the threaded sleeve 22 has a contour 25 for creating a thread 7a, 7b, 7c, 7d, 7e, 7f formed so that a heated film 23 has adapted according to the shape of the mold 20 and in particular contours 25 of the threaded sleeve 22.
- FIG. 11a With the aid of the multipart molding tool 20, comprising the retaining sleeve 21 and the threaded sleeve 22, it is possible in a first method step according to the FIG. 11a first to form the at least two threads 7a, 7b, 7c, 7d, 7e, 7f and then to free the cover shell 1 of the mold 20. This happens accordingly FIG. 11 b by unscrewing the threaded sleeve 22 relative to the stationary holding sleeve 21 in the direction of movement 37. After unscrewing the threaded sleeve 22 is below the level of Stamped counter 41 depressed and is no longer engaged with the thread 7a.
- the holding device 40 comprises a stationary stamping counter 41 and a holding plate 42, which can be lowered in the direction of the stamping counter 41. For fixing the film 23, this is clamped between the stamping counter 41 and the holding plate 42.
- the holding sleeve 21 is provided in its wall portion 28 with retaining ribs 26, which are particularly well in FIG. 13 are visible.
- the retaining ribs 26 are formed in the peripheral wall 29 of the cover shell 1 as a corrugated structure 30 and allow a positive power transmission.
- FIG. 11c As shown method step, the holding sleeve 21 is moved back together with the inner punch 39 in the axial direction and raised the lowerable holding plate 42, so that the film 23 is released with the therein pronounced cover shell 1 of the mold 20 and can be removed. In further, known to those skilled steps then the cover shell 1 can be dissolved out of the film 23.
- FIG. 12 Various functional positions of a mold for cutting mold 20 are shown in FIG. 12 also shown in a partial cross-section.
- the assembly comprising the centrally located inner punch 39, the retaining sleeve 21 and the therefore pivotable threaded sleeve largely with the in the FIG. 11 shown mold 20 identical.
- the molding tool 20 is concentrically surrounded by a holding and punching device 43 with which the cover shell 1 can be punched directly on the molding tool 20 from the film 23.
- the holding and punching device 43 comprises the immediately adjacent to the threaded sleeve 22 knife sleeve 24, arranged around the knife sleeve 24 Abstreifplatte 44 and located above the stripper plate 44 knife plate 45. Both the stripper plate 44 and the knife plate 45 are vertically movable.
- the shaping of the cover shell 1 in the film 23 takes place according to the position of the molding tool 20 in FIG. 12a , Here, the film is fixed by the lowered in the direction of the stripper plate 44 blade plate 45 by a clamping action. After fixing stripping and knife plate 44, 45 were lowered together, so that forms a step in the film 23 in the transition stripper plate 44 to the knife sleeve 24.
- the threaded sleeve is clearlygespindelt according to the direction of movement 37 and a thread 7a in the cover shell 1 visible.
- the knife sleeve 24 was moved upward, whereby the film 23 is sheared at its entire outer circumference on the blade plate 45.
- the torque transmitted during unwinding onto the film resting loosely on the molding tool 20 is absorbed in this embodiment solely by the corrugated structure 30 formed in the circumferential wall 29 and the retaining ribs 26 complementarily shaped in the retaining sleeve 21, thereby causing the film 23, which has meanwhile become detached, to rotate Cover shell 1 avoided during unwinding.
- retaining ribs 26 can be seen, which allow a holding the already completely dissolved from the film 23 cover shell 1 or support a still holding the film 23 in connection cover shell 1 support.
- the holding ribs 26 are in their axial alignment perpendicular to the direction of movement 37 of the threaded sleeve 22.
- the holding ribs 26 are located in the oblique wall portion 28 of the holding sleeve 21.
- the holding ribs 26 are found after the manufacturing process as a corrugated structure 30 on the finished molded lid shell 1 again.
- the holding sleeve 21 is provided with a plurality of vent holes 27, through which air between the film 23 and mold 20 escape or can be removed.
- FIG. 14 shows a further alternative concerning the holding and supporting device 43 arranged around the forming tool 20 in a partial cross-sectional view for performing the band steel cutting.
- the central assembly of the mold 20 is also here the inner punch 39, the neck sleeve 21 and the threaded sleeve 22 is surrounded.
- the mold 20 is surrounded by the holding and supporting device 43, a fixed punching counterpart 41, a retractable retaining plate 42 and a guided on the holding plate 42 strip steel blade 46 comprises.
- a first process step is accordingly Figure 14a the film 23 moved over the mold 20 and fixed around the mold 20, in which the holding plate 42 is lowered and thereby the lying on the punching counterpart 41 film 23 is clamped.
- FIG. 14c illustrated process step includes lowering the strip steel blade 46 on the film 23, whereby the cover shell 1 is removed from the sheet 23 circumferentially.
- the strip steel blade 46 is formed on its underside at discrete intervals with recesses, so that the cover shell 1 remains connected via residual webs 38 with the film 23. These residual webs 38 break out in a controlled manner in subsequent stacking processes.
- the holding plate 42 is raised and the inner punch 39 together with the holding sleeve 21 down to a uniform level of punching counter 41 and lowered threaded sleeve 22 method ( Figure 14d ). In this position, the film 23 can be removed together with the cover shell 1 in a simple manner horizontally from the mold 20 and the holding and punching device 43.
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Description
Die Erfindung betrifft ein Tiefziehvefahren zum ein Tiefziehverfahren zum Herstellen einer ersten Schale sowie ein Formwerkzeug zum Durchführen des Verfahrens. The invention relates to a thermoforming process for a deep drawing process for producing a first shell and a molding tool for carrying out the method.
Aus einer Kombination einer ersten Schale, beispielsweise einer Deckelschale, mit einer zweiten Schale, beispielsweise einer Bodenschale, entsteht ein Behältnis, bei dem in zusammengefügten Zustand die erste Schale von außen an die zweite Schale angreift, wobei die zweite Schale mit einem kreisrunden Öffnungsrand ausgebildet ist, und bei dem die erste Schale mit einem Halterand die zweite Schale überragt. Solche Behältnisse dienen zum Aufbewahren und zum Transport von Kleinteilen jeder Art, insbesondere auch von Lebensmitteln, wie beispielsweise Frischkäse, Joghurt und dergleichen, und bei letzterem auch von Salatkompositionen, die mit Dressing versehen sind oder zu denen noch das Dressing zugegeben werden muss. Ein gattungsfremdes, da im Spritzgussverfahren hergestelltes Behältnis, offenbart die
Da die Behältnisse üblicherweise nach dem Aufbrauchen des Inhalts entsorgt werden, kommen nur besonders preisgünstig zu fertigende Behältnisse für diesen Einsatzzweck in Frage, die sich aus einem thermoplastischen Material im Tiefziehverfahren herstellen lassen.Since the containers are usually disposed of after the consumption of the contents, only particularly inexpensive to be manufactured containers for this purpose in question, which can be produced from a thermoplastic material by deep-drawing.
Ein aus einem tiefgezogenen Kunststoffmaterial gefertigtes Behältnis mit zwei gegeneinander verschraubbaren Hälften ist in der
Ein Tiefziehverfahren zum Herstellen einer Schale mit einem Gewinde und ein einteiliges Formwerkzeug dafür sind bekannt aus
Herkömmliche widerverschließbare Behältnisse, beispielsweise für Joghurt, mit möglichst einfachen und preiswerten Verschluss- oder Verriegelungsmitteln verfügen über eine Bodenschale mit zugehöriger Deckelschale, wobei die Deckelschale im Bereich des Öffnungsrandes über eine so genannte Deckelschürze mit Rastelementen verfügt, die unter den Schalenrand greifen. Beim Öffnen des Behältnisses wird die Deckelschürze über den Öffnungsrand gezogen. Hierzu muss unter die Deckelschürze gegriffen und die Schnappverriegelung gelöst werden, um den Deckel abnehmen zu können. Dieses ist nicht nur unhandlich, sondern es besteht auch die Gefahr, dass die Finger mit dem Behälterinhalt in Kontakt kommen.Conventional resealable containers, for example for yogurt, with as simple and inexpensive closure or locking means have a bottom shell with associated lid shell, the lid shell has in the region of the opening edge on a so-called lid skirt with locking elements that engage under the shell edge. When opening the container, the lid skirt is pulled over the opening edge. To do this, grasp under the cover apron and release the snap lock to remove the cover. This is not only unwieldy, but there is also the danger that the fingers come into contact with the container contents.
Demzufolge lag der Erfindung die Aufgabe zugrunde, ein Tiefziehverfahren weiterzubilden, mit dem auf fertigungstechnisch einfache Weise eine Gewindestruktur in eine erste Schale eingebracht werden kann.Accordingly, the invention had the object of developing a deep-drawing process, with the manufacturing technology simple way a thread structure can be introduced into a first shell.
Eine weitere Teilaufgabe bestehent in dem Entwickeln einer Vorrichtung zum Herstellen der ersten Schalen.Another subtask is the development of a device for manufacturing the first trays.
Die Aufgabe wird erfindungsgemäß mit einem Tiefziehverfahren gemäß Anspruch 1 gelöst, wobei unter Verwendung eines Formwerkzeuges mit einer drehfest angeordneten Haltehülse und einer zu der Haltehülse in Umfangsrichtung verschwenkbaren Gewindehülse, bei dem zunächst in einer Ausgangsstellung von Haltehülse und Gewindehülse eine Folie über das Formwerkzeug gefahren, die Folie zum Ausbilden einer ersten Schale in das Formwerkzeug eingebracht, geklemmt und ausgeformt wird, die Gewindehülse durch Ausspindeln in eine Endstellung gebracht und die Schale von der Haltehülse abgestriffen wird.The object is achieved with a deep-drawing process according to
Bei dem erfindungsgemäßen Verfahren handelt es sich ausschließlich um den Formgebungsprozess zum Erstellen einer Schale mit einem daran befindlichen Gewinde, beispielsweise einer Deckelschale. Nach dem Positionieren der Folie über dem Formwerkzeug wird die Folie vorzugsweise von ihrer Oberseite mit Druckluft beaufschlagt und schmiegt sich an das Formwerkzeug an. In diesem Arbeitsgang wird die Schale mit den Gewindegängen geformt. Um die Schale von dem Formwerkzeug, insbesondere von den Konturen der Gewindegänge, zu lösen, wird die Gewindehülse ausgespindelt. Hierunter wird ein Vorgang vergleichbar mit einer Mutter und einer Schraube verstanden, wobei die Mutter die erste Schale und die Schraube die Gewindehülse darstellt. Durch Herausschrauben der Schraube aus der Mutter beziehungsweise der Gewindehülse aus der ersten Schale verliert die Gewindehülse den Kontakt zu der ersten Schale und gibt diese dadurch frei, so dass die erste Schale nach oben von dem Formwerkzeug abgehoben werden kann.The method according to the invention is exclusively the shaping process for creating a shell with a thread located thereon, for example a cover shell. After positioning the film over the mold, the film is preferably acted upon from its upper side with compressed air and nestles against the mold. In this operation, the shell is formed with the threads. To loosen the shell of the mold, in particular of the contours of the threads, the threaded sleeve is spindled. Below this is a process understood similar to a nut and a screw, wherein the nut is the first shell and the screw is the threaded sleeve. By unscrewing the screw from the nut or the threaded sleeve from the first shell, the threaded sleeve loses contact with the first shell and thereby releases it, so that the first shell can be lifted upwards from the molding tool.
In einer bevorzugten Ausführung des Verfahrens wird die Schale während des Ausspindelns von der Haltehülse und/oder von der Folie gehalten. Grundsätzlich ist es möglich, die erste Schale während des Ausspindelns ausschließlich über die Folie zu fixieren, um dadurch zu verhindern, dass die Schale mit der Gewindehülle mitdreht. Dieses ist jedoch insbesondere bei Weichen oder dünnen Materialen problematisch, da die Folie die beim Ausspindeln auftretenden Kräfte nicht aufnehmen kann und es zu Deformationen an der ersten Schale kommt. Aus diesem Grund ist es vorteilhaft, die erste Schale zumindest zusätzlich auch mit der Haltehülse gegenzuhalten.In a preferred embodiment of the method, the shell is held during the unwinding of the holding sleeve and / or of the film. In principle, it is possible to fix the first shell exclusively on the film during unwinding, thereby preventing the shell from rotating with the threaded shell. However, this is particularly problematic for switches or thin materials, since the film can not absorb the forces occurring during unscrewing and it comes to deformation of the first shell. For this reason, it is advantageous to counter the first shell at least additionally with the retaining sleeve.
Bei dem vorstehend beschriebenen Verfahren kann die Schale zusammen mit der Folie von der Haltehülse abgestreift werden. In einem weiteren Schritt wird die mit den ersten Schalen eingeprägte Folie einer weiteren üblichen Stanzmaschine zugeführt und die Schalen aus der Folie herausgetrennt.In the method described above, the shell can be stripped off the retaining sleeve together with the film. In a further step, the film impressed with the first shells is fed to another conventional punching machine and the shells are cut out of the film.
Durch den Transport der Folie zu einer räumlich entfernt liegenden Stanzmaschine kommt es jedoch zu einer weiteren Abkühlung der Folie und der darin bereits ausgeformten ersten Schalen, so dass ein Heraustrennen nicht konzentrisch um die vorgesehene Form der ersten Schale sondern versetzt dazu erfolgt. Dieser Nachteil tritt besonders bei Materialien mit hohem materialbedingten Schrumpfen in den Vordergrund, beispielsweise bei Polypropylen (PP). Das Material PP weist bei Abkühlung eine unregelmäßig auftretende Schrumpfung von ca. 2 % auf. Weniger kritisch ist ein zeitverzögertes Heraustrennen bei Polysterol (PS), welches kalkulierbar um maximal 0,5 % schrumpft.By transporting the film to a spatially remote punching machine, however, there is a further cooling of the film and the first shells already formed therein, so that a separation is not concentric about the intended shape of the first shell but offset it. This disadvantage is particularly important for materials with high material shrinkage in the foreground, for example in polypropylene (PP). The material PP is included Cooling an irregular shrinkage of about 2%. Less critical is a time-delayed separation in polystyrene (PS), which shrinks calculable by a maximum of 0.5%.
Für stark schrumpfende Materialien ist es daher vorteilhaft, wenn die erste Schale unmittelbar auf dem Formwerkzeug nach dem Ausspindein der Gewindehülse aus der Folie gestanzt wird. Dieses reduziert in erheblichem Maße die Ausschüsse, da nunmehr eine exakte Ausrichtung der Schale zu dem Stanzwerkzeug möglich ist und ein Zwischentransport von dem Formgebungswerkzeug zu dem Stanzwerkzeug entfällt.For strongly shrinking materials, it is therefore advantageous if the first shell is punched directly on the mold after Ausspindein the threaded sleeve of the film. This reduces the committees to a considerable extent, since now an exact alignment of the shell is possible to the punch and an intermediate transport from the forming tool to the punch deleted.
Einen qualitativ noch präzisere konzentrische Formgebung lässt sich erreichen, wenn die Schale auf dem Formwerkzeug bereits vor dem Ausspindeln der Gewindehülse aus der Folie gestanzt wird. Hierbei kann die erste Schale, da sie vor dem Ausspindeln bereits aus dem Folienverbund gelöst ist, ausschließlich über die Haltehülse gegen Mitdrehen mit der Gewindehülse fixiert werden. Hierzu ist die Haltehülse mit einer geometrischen Struktur versehen, die nach dem Formgebungsprozess komplementär in der ersten Schale ausgebildet ist und eine formschlüssige Kraftübertragung ermöglicht.A qualitatively even more precise concentric shaping can be achieved if the shell is already punched out of the film on the molding tool before the threaded sleeve is unwound. Here, the first shell, since it is already released from the film composite prior to unwinding, be fixed exclusively on the retaining sleeve against rotation with the threaded sleeve. For this purpose, the holding sleeve is provided with a geometric structure which is formed after the forming process complementary in the first shell and allows a positive power transmission.
Sofern die erste Schale vollständig aus der Folie herausgelöst wird, handelt es sich um ein Formschneideverfahren.If the first shell is completely dissolved out of the film, it is a form cutting process.
Es hat sich alternativ hierzu jedoch auch als günstig erwiesen, die erste Schale nur teilweise aus der Folie zu stanzen und Reststege zwischen der Folie und der Schale stehen zu lassen. Bei diesem Verfahren handelt es sich um das Bandstahlschneiden. Hierbei werden zumindest teilweise noch Kräfte von der Folie während des Ausspindelns aufgenommen und dennoch sehr präzise konzentrische Teile gefertigt. Die Reststege werden in nachfolgenden Stapelverfahren durchbrochen. Ein wesentlicher Vorteil sind die geringeren Herstellungskosten gegenüber dem Formschneiden. Ein Nachteil gegenüber dem Formschneiden liegt in den möglicherweise verbleibenden, nicht vollständig ausgebrochenen Reststegen mit gefahrenträchtigen Schnittkanten.As an alternative, however, it has also proved to be favorable to punch the first shell only partially out of the film and to leave residual webs between the film and the shell. This method is band steel cutting. In this case, at least some of the forces are still absorbed by the film during unwinding and still made very precise concentric parts. The remaining webs are broken in subsequent stacking processes. One a significant advantage is the lower manufacturing costs compared to the form cutting. A disadvantage compared with the shape cutting lies in the possibly remaining, not completely broken residual webs with dangerous cut edges.
Die Teilaufgabe wird durch ein Formwerkzeug zum Herstellen einer ersten Schale mit einer feststehenden Haltehülse und einer zu der Haltehülse in Umfangsrichtung aus einer Ausgangsstellung in eine Endstellung verschwenkbaren Gewindehülse gelöst, wobei in der Gewindehülse Konturen zum Ausformen von mindestens zwei Gewindegängen ausgebildet sind.The subtask is achieved by a molding tool for producing a first shell with a stationary retaining sleeve and a sleeve rotatable in the circumferential direction from a starting position to an end position threaded sleeve, wherein in the threaded sleeve contours for forming at least two threads are formed.
Vorteilhafterweise ist zentrisch innerhalb der Haltehülse ein Innenstempel angeordnet Der Innenstempel dient der Formgebung des inneren topfartigen Mittelteils und kann in einer besonderen Ausführungsform alleine oder zusammen mit der Haltehülse in axialer. Richtung verschiebbar sein. Aufgrund der Verschiebbarkeit ist es möglich, nach dem Ausspindeln der Gewindehülse die erste Schale gegenüber dem Formwerkzeug anzuheben und abzutransportieren.An inner punch is advantageously arranged centrally within the holding sleeve. The inner punch serves to shape the inner cup-shaped middle part and, in a particular embodiment, can be used alone or together with the holding sleeve in the axial direction. Be displaceable direction. Due to the displaceability, it is possible to lift the first shell relative to the mold after removal of the threaded sleeve and transported away.
Vorzugsweise ist die Gewindehülse konzentrisch um die Haltehülse angeordnet, so dass sich beim Ausspindeln die Gewindehülse symmetrisch um die Haltehülse dreht. Dabei sollte die Haltehülse innen liegen und die Gewindehülse außen.Preferably, the threaded sleeve is arranged concentrically around the holding sleeve, so that when unwinding the threaded sleeve rotates symmetrically about the holding sleeve. The retaining sleeve should be inside and the threaded sleeve outside.
In einer günstigen Ausführungsform weist die Haltehülse einen schrä-, gen Wandabschnitt auf, in welchem Halterippen angeordnet sind. Dabei können je nach Winkel des schrägen Wandabschnitts die Halterippen in axialer oder radialer Richtung der Haltehülse ausgerichtet sein. In jedem Fall sollten die Halterippen möglichst rechtwinklig zu der Drehrichtung der Gewindehülse stehen, so dass ein aus der Schwenkbewegung der Gewindehülse auf die Schale wirkendes Drehmoment durch die Halterippen aufgefangen wird.In a favorable embodiment, the retaining sleeve has a sloping wall portion, in which retaining ribs are arranged. Depending on the angle of the inclined wall section, the retaining ribs can be aligned in the axial or radial direction of the retaining sleeve. In any case, the retaining ribs should be as perpendicular as possible to the direction of rotation of the threaded sleeve, so that one of the pivoting movement the threaded sleeve on the shell acting torque is absorbed by the retaining ribs.
Für den reinen Formgebungsprozess reicht es aus, wenn um die Gewindehülse eine Haltevorrichtung angeordnet ist, mit welcher die Folie außerhalb des Formwerkzeugs geklemmt und dadurch fixiert werden kann. Die Haltevorrichtung kann beispielsweise eine feststehende Stanzgegenlage und eine absenkbare Halteplatte umfassen.For the pure molding process, it is sufficient if a holding device is arranged around the threaded sleeve, with which the film can be clamped outside of the mold and thereby fixed. The holding device may comprise, for example, a fixed punching counter and a lowerable holding plate.
Für den Fall, dass mit dem Formwerkzeug das Formschneiden oder Bandstahlschneiden durchgeführt werden soll, kann anstelle der Haltevorrichtung eine Halte- und Stanzvorrichtung umfänglich um die Gewindehülse angeordnet sein.In the event that the mold cutting or band steel cutting is to be performed, instead of the holding device, a holding and punching device may be arranged circumferentially around the threaded sleeve.
Das Formschneiden kann besonders vorteilhaft mit einer Halte- und Stanzvorrichtung durchgeführt werden, die eine Abstreifplatte, eine absenkbare Messerplatte und eine die Gewindehülse konzentrisch umgebende feststehende Messerhülse umfasst, wobei die Abstreifplatte und die Messerplatte vertikal verfahrbar sind. Vorzugsweise ist die Messerhülse zwischen der Gewindehülse und der Abstreifplatte angeordnet.The mold cutting can be carried out particularly advantageously with a holding and punching device comprising a stripper plate, a lowerable knife plate and a threaded sleeve surrounding the concentric fixed knife sleeve, wherein the stripper plate and the knife plate are moved vertically. Preferably, the knife sleeve between the threaded sleeve and the stripper plate is arranged.
Mit Hilfe der absenkbaren Messerplatte wird die Folie, nachdem sie über das Formwerkzeug gefahren ist, zwischen der Messerplatte geklemmt. Im Anschluss an den Formgebungsprozess und nach dem Ausspindeln der Gewindehülse wird diese nach oben verfahren und schert dabei die Folie mit der Messerplatte ab.With the help of the lowerable knife plate, the film, after it has moved over the mold, clamped between the blade plate. Following the forming process and after unwinding the threaded sleeve, the latter is moved upwards, thereby shearing off the film with the knife plate.
Besonders günstig ist es, wenn die Messerhülse gegenüber der Abstreifplatte während des Verfahrens der Folie geringfügig vorsteht, so dass sich in der Folie eine Stufe im Übergang der Abstreifplatte zu der Messerhülse ausbildet, die der Abdichtung während des Formgebungsprozesses dient.It is particularly favorable if the knife sleeve protrudes slightly relative to the stripper plate during the process of the film, so that a step forms in the film in the transition of the stripper plate to the knife sleeve, which serves for sealing during the shaping process.
Sofern der Formgebungsprozess mit dem Bandstahlschneiden ergänzt werden soll, kann die Halte- und Stanzvorrichtung eine feststehende Stanzgegenlage, eine absenkbare Halteplatte und ein auf die Stanzgegenlage absenkbares Bandstahlmesser umfassen. Bei dem Bandstahlmesser handelt es sich um einen einseitig oder beidseitig geschärften Bandstahl, der in Umfangsrichtung ringförmig geschlossen und auf seiner geschärften Unterseite mit Ausnehmungen zum Verbleib von Reststegen ausgebildet ist. Die Halteplatte zum Halten der Folie und das Bandstahlmesser sind dabei zwei voneinander getrennte Bauteile, so dass ein verschlissenes Bandstahlmesser auf einfache Art und Weise einzeln ausgetauscht werden kann. Hierdurch werden besonders günstige Produktionskosten möglich.If the forming process is to be supplemented with the band steel cutting, the holding and punching device may comprise a fixed punching counter, a lowerable holding plate and a lowerable on the punch counter strip steel blade. The steel strip knife is a steel strip which has been sharpened on one or both sides and which is annularly closed in the circumferential direction and is formed on its sharpened underside with recesses for remaining webs remaining. The holding plate for holding the film and the strip steel blade are two separate components, so that a worn strip steel blade can be exchanged individually in a simple manner. As a result, particularly favorable production costs are possible.
Besonders vorteilhaft ist es, wenn in der Haltehülse Entlüftungsbohrungen angeordnet sind. Während des Tiefziehens wird üblicherweise das Formwerkzeug von oben mit Druckluft beaufschlagt, so dass sich die Folie an das formgebende Werkzeug anschmiegt und eine Schalenform annimmt. Dieses Anschmiegen wird durch die Entlüftungsbohrungen unterstützt. Es auch möglich an die Entlüftungsbohrungen eine Unterdruckleitung anzuschließen und die Folie an das formgebende Werkzeug anzusaugen.It is particularly advantageous if vent holes are arranged in the retaining sleeve. During deep drawing usually the mold is pressurized from above with compressed air, so that the film conforms to the forming tool and assumes a shell shape. This nestling is supported by the vent holes. It is also possible to connect to the vent holes a vacuum line and suck the film to the forming tool.
In einer besonders günstigen Ausführungsform legt die Gewindehülse zwischen Ausgangs- und Endstellung bei der Entformung einen Verfahrweg von 10 % bis 25 % ihres Umfanges zurück.In a particularly favorable embodiment, the threaded sleeve sets a travel distance of 10% to 25% of its circumference between the initial and end positions during demoulding.
Die Erfindung wird nachfolgend anhand von 14 Zeichnungsfiguren näher erläutert. Es zeigen dabei die
- Fig. 1:
- eine perspektivische Außenansicht auf eine erste Schale als Deckelschale mit umlaufendem Dichtkegel;
- Fig. 2:
- eine Seitenansicht der ersten Schale gemäß
Fig. 1 ; - Fig. 3:
- einen Querschnitt der ersten Schale gemäß
Fig. 1 ; - Fig. 4:
- einen ausschnittsweise vergrößerten Querschnitt von Halterand, Reduzierbund, Dichtkegel und topfförmigem Mittelteil der ersten Schale als Deckelschale;
- Fig. 5:
- eine perspektivische Außenansicht auf eine erste Schale als Deckelschale ohne Dichtkegel;
- Fig. 6:
- eine perspektivische Außenansicht auf eine erste Schale als Deckelschale mit ausschließlich innenliegender Riffelstruktur;
- Fig. 7:
- eine perspektivische Außenansicht auf eine zweite Schale als Bodenschale mit symmetrisch geformten Halteflügeln;
- Fig. 8:
- eine Draufsicht auf die zweite Schale gemäß
Fig. 7 ; - Fig. 9:
- eine Seitenansicht auf die zweite Schale gemäß
Fig. 7 ; - Fig. 10:
- eine Draufsicht auf eine zweite Schale als Bodenschale mit asymmetrisch geformten Halteflügeln;
- Fig. 11a-c:
- einen teilweisen Querschnitt durch ein Formgebungswerkzeug in verschiedenen Funktionsstellungen;
- Fig. 12a-c:
- einen teilweisen Querschnitt durch ein Formgebungswerkzeug in verschiedenen Funktionsstellungen zum Formschneiden;
- Fig. 13:
- eine teilweise Draufsicht auf das Formgebungswerkzeug gemäß
Fig. 12a-c ; - Fig. 14a-d:
- einen teilweisen Querschnitt durch ein Formgebungswerkzeug in verschiedenen Funktionsstellungen zum Bandstahlschneiden.
- Fig. 1:
- an external perspective view of a first shell as a cover shell with circumferential sealing cone;
- Fig. 2:
- a side view of the first shell according to
Fig. 1 ; - 3:
- a cross section of the first shell according to
Fig. 1 ; - 4:
- a fragmentary enlarged cross-section of retaining edge, Reduzierbund, sealing cone and cup-shaped middle part of the first shell as a cover shell;
- Fig. 5:
- an external perspective view of a first shell as a cover shell without sealing cone;
- Fig. 6:
- an external perspective view of a first shell as a cover shell with only internal corrugated structure;
- Fig. 7:
- an external perspective view of a second shell as a bottom shell with symmetrically shaped retaining wings;
- Fig. 8:
- a plan view of the second shell according to
Fig. 7 ; - Fig. 9:
- a side view of the second shell according to
Fig. 7 ; - Fig. 10:
- a plan view of a second shell as a bottom shell with asymmetrically shaped retaining wings;
- Fig. 11a-c:
- a partial cross section through a forming tool in different functional positions;
- Fig. 12a-c:
- a partial cross section through a forming tool in various functional positions for cutting molds;
- Fig. 13:
- a partial plan view of the forming tool according to
Fig. 12a-c ; - Fig. 14a-d:
- a partial cross section through a forming tool in different functional positions for steel strip cutting.
Die
Der Halterand 4 ist mit einem Befestigungsmittel 47 in Form von insgesamt vier Gewindegängen 7a, 7b, 7c, 7d versehen, deren Konturen sowohl auf der Innenseite 6a (siehe
Der Halterand 4 ist außerdem nach außen mit einem umlaufenden Stanzrand 49 umgeben. Dieser weist einen größeren Durchmesser auf als die Deckelschale 1, da dieser bei der Herstellung beispielsweise mit einer in
In der Seitenansicht der
Auf der Einlaufseite 31 eines jeden Gewindeganges 7a, 7b, 7c, 7d befindet sich jeweils ein Gewindeeinlauf 48, der sich in Richtung der Einlaufseite 31 trichterartig aufweitet, um eine leichtere Aufnahme beispielsweise eines Halteflügels 11 a, 11 b, 11 c, 11 d zu ermöglichen. Darüber hinaus sind die in Drehrichtung liegenden Gewindezähne 17a, 17b, 17c, 17d auf der Einlaufseite 31 entsprechend abgerundet.On the
Alle Gewindegänge 7a, 7b, 7c, 7d laufen unter einem spitzen Winkel von unter 45° gegen den Reduzierbund 5 aus. Dieser Bereich stellt einen Klemmbereich 32 dar, in welchem beispielsweise Halteflügel 11a, 11 b, 11 c, 11 d mit ihrer Vorderkante 12 (s.
Die
Der Innendurchmesser 18 des Halterandes 4 ist definiert durch den lichten Abstand zweier gegenüberliegender Gewindezähne 17a, 17b, 17c, 17d. In der
Zwischen dem Reduzierbund 5 und der Umfangswand 29 des topfartigen Mittelteils 3 ist der in Richtung der Unterseite 9 vorstehende Dichtkegel 8a sichtbar, der geschlossen um das topfartige Mittelteil 3 verläuft. In zusammengefügtem Zustand von Deckelschale 1 und einer Bodenschale 2 stößt der Dichtkegel 8a von innen gegen einen Öffnungsrand 10 (
Die
Der Reduzierbund 5 verläuft waagerecht und steht damit im Wesentlichen senkrecht zu dem oberen Abschnitt 34a der Becherwand 33 (s.
In der
Darüber hinaus weist die in
Die
In der
Der Öffnungsrand 10 der zweiten Schale weist ein Befestigungsmittel 47 in Form von insgesamt vier gleichmäßig nach außen ragenden Halteflügeln 11 a, 11 b, 11 c, 11 d auf. Diese Halteflügel 11a, 11 b, 11 c, 11 d können in entsprechend ausgebildete Gewindegänge 7a, 7b, 7c, 7d, 7e, 7f, wie in den
Die Halteflügel 11a, 11 b, 11 c, 11 d befinden sich zueinander in einer Ebene und schließen nach oben plan mit dem Öffnungsrand 10 ab.The retaining
Der Abstand von der Außenkante 14 eines Halteflügels 11 b zu der Au-βenkante 14 des gegenüberliegenden Halteflügels 11 d wird als Vollkreisdurchmesser 16 bezeichnet. Der Vollkreisdurchmesser 16 ist geringfügig kleiner gewählt als der Nenndurchmesser 15 der Deckelschale 1. Der Außendurchmesser 19 des Öffnungsrandes 10 wird außerhalb der Halteflügel 11a, 11 b, 11 c, 11d gemessen. Damit die Deckelschale 1 über die Bodenschale 2 greifen kann, ist der Außendurchmesser 19 geringfügig kleiner gewählt als der Innendurchmesser 18 des Halterandes 4 (vergleiche
Die symmetrische Verteilung der Halteflügel 11 a, 11b, 11 c, 11d ist auch der Draufsicht gemäß
Die
Die
In den nachfolgenden
Ein Formwerkzeug 20 in drei unterschiedlichen Funktionsstellungen mit einer bereits zu einer Deckelschale 1 ausgeformten Folie 23 zeigt ausschnittsweise in einem Querschnitt die
In der
Mit Hilfe des mehrteiligen Formwerkzeuges 20, umfassend die Haltehülse 21 und die Gewindehülse 22, ist es möglich, in einem ersten Verfahrensschritt gemäß der
Während der in
Ein Verdrehen der in der Folie 23 ausgeformten Deckelschale 1 wird zusätzlich zu der Haltevorrichtung 40 durch die Haltehülse 21 verhindert. Hierfür ist die Haltehülse 21 in ihrem Wandabschnitt 28 mit Halterippen 26 versehen, die besonders gut in
In einem letzten, in
Verschiedene Funktionsstellungen eines Formwerkzeugs 20 zum Formschneiden werden in der
Das Formwerkzeug 20 ist jedoch mit einer Halte- und Stanzvorrichtung 43 konzentrisch umgeben, mit welcher die Deckelschale 1 unmittelbar auf dem Formwerkzeug 20 aus der Folie 23 gestanzt werden kann.However, the
Die Halte- und Stanzvorrichtung 43 umfasst die unmittelbar an die Gewindehülse 22 angrenzende Messerhülse 24, die um die Messerhülse 24 angeordnete Abstreifplatte 44 und die oberhalb der Abstreifplatte 44 befindliche Messerplatte 45. Sowohl die Abstreifplatte 44 als auch die Messerplatte 45 sind vertikal verfahrbar.The holding and punching
Die Formgebung der Deckelschale 1 in der Folie 23 erfolgt gemäß der Stellung des Formwerkzeugs 20 in
In der
Abschließend wird, wie in
In der teilweisen Draufsicht der
Die Haltehülse 21 ist mit mehreren Entlüftungsbohrungen 27 versehen, durch welche zwischen Folie 23 und Formwerkzeug 20 befindliche Luft entweichen oder abgezogen werden kann.The holding
Die
Die zentrale Baugruppe des Formwerkzeugs 20 stellt auch hier der Innenstempel 39, die Halehülse 21 und die Gewindehülse 22 dar. Umgeben ist das Formwerkzeug 20 von der Halte- und Stützvorrichtung 43, die eine feststehende Stanzgegenlage 41, eine absenkbare Halteplatte 42 und ein an der Halteplatte 42 geführtes Bandstahlmesser 46 umfasst.The central assembly of the
In einem ersten Verfahrensschritt wird entsprechend
Anschließend wird, wie in
Ein weiterer in
Nach dem Ausstanzen der Deckelschale 1 aus der Folie 23 wird die Halteplatte 42 angehoben und der Innenstempel 39 zusammen mit der Haltehülse 21 nach unter bis auf ein einheitliches Niveau von Stanzgegenlage 41 und abgesenkter Gewindehülse 22 verfahren (
Claims (21)
- Thermoforming process for producing a first shell (1, 2), for example a cover shell (1), using a moulding tool (20) having a holding sleeve (21), which is arranged in a rotationally fixed manner, and a threaded sleeve (22) which is pivotable in the circumferential direction with respect to the holding sleeve (21), wherein contours (25) for forming at least two threads (7a-7f) are formed in the threaded sleeve (22), wherein- in a starting position of the holding sleeve (21) and the threaded sleeve, (22), a film (23) is moved over the moulding tool (20),- in order to form the shell (1, 2), the film (23) is introduced into the moulding tool (20), clamped and formed,- the threaded sleeve (22) is moved into an end position by screwing out, and- the shell (1, 2) is stripped from the holding sleeve.
- Thermoforming process according to Claim 1, wherein the shell (1, 2) is held by the holding sleeve (21) and/or by the film (23) during the screwing out process.
- Thermoforming process according to Claim 1 or 2, wherein the shell (1, 2) is stripped from the holding sleeve (21) together with the film (23).
- Thermoforming process according to Claim 1 or 2, wherein the shell (1, 2) is punched from the film (23) on the moulding tool (20) after the threaded sleeve (22) has been screwed out.
- Thermoforming process according to Claim 1, wherein the shell (1, 2) is punched from the film (23) on the moulding tool (20) before the threaded sleeve (22) has been screwed out.
- Thermoforming process according to Claim 4 or 5, wherein the shell (1, 2) is punched entirely from the film (23).
- Thermoforming process according to Claim 4 or 5, wherein the shell (1, 2) is punched partially from the film (23) and residual webs (38) remain between the film (23) and the shell (1, 2).
- Moulding tool (20) for carrying out the process according to one of Claims 1 to 7, having a holding sleeve (21), which is arranged in a rotationally fixed manner, and a threaded sleeve (22) which is screwable from a starting position into an end position in the circumferential direction with respect to the holding sleeve (21), wherein contours (25) for forming at least two threads (7a, 7b, 7c, 7d, 7e, 7f) are formed in the threaded sleeve (22).
- Moulding tool according to Claim 8, wherein an inner punch (39) is arranged centrally within the holding sleeve (21).
- Moulding tool according to Claim 9, wherein the inner punch (39) and/or the holding sleeve (21) are movable in the axial direction.
- Moulding tool according to one of Claims 8 to 10, wherein the threaded sleeve (22) is arranged concentrically around the holding sleeve (21).
- Moulding tool according to one of Claims 8 to 11, wherein the holding sleeve (21) has an inclined wall section (28) in which holding ribs (26) are arranged.
- Moulding tool according to Claim 12, wherein the holding ribs (26) are oriented in the axial or radial direction of the holding sleeve (21).
- Moulding tool according to one of Claims 8 to 13, wherein a holding device (40) is arranged around the threaded sleeve (22).
- Moulding tool according to Claim 14, wherein the holding device (40) comprises a fixed stamping abutment (41) and a lowerable holding plate (42).
- Moulding tool according to one of Claims 8 to 13, wherein a holding and stamping device (43) is arranged circumferentially around the threaded sleeve (22).
- Moulding tool according to Claim 16, wherein the holding and stamping device (43) comprises a stripping plate (44), a lowerable cutter plate (45) and a fixed cutter sleeve (24) concentrically surrounding the threaded sleeve (22), wherein the stripping plate (44) and the cutter plate (45) are vertically displaceable.
- Moulding tool according to Claim 17, wherein the cutter sleeve (24) is arranged between the threaded sleeve (22) and the stripping plate (44).
- Moulding tool according to Claim 16, wherein the holding and stamping device (43) comprises a fixed stamping abutment (41), a lowerable holding plate (42) and a steel strip cutter (46) that is lowerable onto the stamping abutment (41).
- Moulding tool according to one of Claims 8 to 19, wherein ventilation holes (27) are arranged in the holding sleeve (21).
- Moulding tool according to one of Claims 8 to 20, wherein the threaded sleeve (22) covers a displacement travel, which corresponds to 10% to 25% of its circumference, between the starting and end positions.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004039814A DE102004039814A1 (en) | 2004-08-12 | 2004-08-12 | Container with lid |
PCT/EP2005/008779 WO2006018239A1 (en) | 2004-08-12 | 2005-08-12 | Receptacle comprising a lid |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1776286A1 EP1776286A1 (en) | 2007-04-25 |
EP1776286B1 true EP1776286B1 (en) | 2013-06-19 |
Family
ID=35169626
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05773895.7A Not-in-force EP1776286B1 (en) | 2004-08-12 | 2005-08-12 | Deep drawing method for producing a lid and apparatus therefor |
Country Status (7)
Country | Link |
---|---|
US (1) | US20070187408A1 (en) |
EP (1) | EP1776286B1 (en) |
CA (1) | CA2576591A1 (en) |
DE (1) | DE102004039814A1 (en) |
EA (1) | EA010245B1 (en) |
MX (1) | MX2007001771A (en) |
WO (1) | WO2006018239A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011051402A1 (en) | 2011-06-28 | 2013-01-03 | Rpc Bebo-Plastik Gmbh | Method of making a thermoformed article and such article |
DE102016119818B3 (en) * | 2016-10-18 | 2017-09-14 | Marbach Werkzeugbau Gmbh | Multi-part packaging |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7037497U (en) * | 1971-01-07 | Illig A Maschinenbau | Device for the production of objects such as lids and bases made of thermoplastic plastic film | |
US3322262A (en) * | 1965-06-01 | 1967-05-30 | Leaming Plastics Inc | Moisture-tight container |
DE1704804B2 (en) * | 1967-12-15 | 1975-05-22 | Josef Krauss Und Rudolf Lensing Maschinenfabrik Gmbh, 5000 Koeln | Method and device for the production of plastic threaded caps for bottles and other containers |
US3782574A (en) * | 1970-08-20 | 1974-01-01 | R Rumble | Tamperproof closure for containers |
JPS58220703A (en) * | 1982-06-18 | 1983-12-22 | Toumei Kagaku Kogyo Kk | Mold device |
JPH0948444A (en) * | 1995-08-09 | 1997-02-18 | Chugoku Pearl Hanbai Kk | Container with fitting cover |
US5542532A (en) * | 1995-10-27 | 1996-08-06 | Mitchell; David C. | Compact disc holder |
US5638976A (en) * | 1995-11-15 | 1997-06-17 | Arnold; Bruce Douglas | Container with rotatable locking lid |
SE518637C2 (en) * | 1999-04-21 | 2002-11-05 | Christer Ljungqvist | Thermo-shaped container and lid made of thin-walled plastic and method of making the container and lid |
DE10230001A1 (en) * | 2002-07-03 | 2004-01-22 | Sig Technology Ltd. | Lids for composite beverage cartons, as well as tools and methods for producing such a lid, and composite beverage cartons provided therewith |
-
2004
- 2004-08-12 DE DE102004039814A patent/DE102004039814A1/en not_active Withdrawn
-
2005
- 2005-08-12 EP EP05773895.7A patent/EP1776286B1/en not_active Not-in-force
- 2005-08-12 CA CA002576591A patent/CA2576591A1/en not_active Abandoned
- 2005-08-12 EA EA200700218A patent/EA010245B1/en not_active IP Right Cessation
- 2005-08-12 US US11/660,120 patent/US20070187408A1/en not_active Abandoned
- 2005-08-12 WO PCT/EP2005/008779 patent/WO2006018239A1/en active Application Filing
- 2005-08-12 MX MX2007001771A patent/MX2007001771A/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
US20070187408A1 (en) | 2007-08-16 |
CA2576591A1 (en) | 2006-02-23 |
DE102004039814A1 (en) | 2006-02-23 |
EA010245B1 (en) | 2008-06-30 |
MX2007001771A (en) | 2007-09-11 |
EP1776286A1 (en) | 2007-04-25 |
EA200700218A1 (en) | 2007-06-29 |
WO2006018239A1 (en) | 2006-02-23 |
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