WO2001094234A1 - Thin-walled container and method for production thereof - Google Patents
Thin-walled container and method for production thereof Download PDFInfo
- Publication number
- WO2001094234A1 WO2001094234A1 PCT/EP2001/003696 EP0103696W WO0194234A1 WO 2001094234 A1 WO2001094234 A1 WO 2001094234A1 EP 0103696 W EP0103696 W EP 0103696W WO 0194234 A1 WO0194234 A1 WO 0194234A1
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- WO
- WIPO (PCT)
- Prior art keywords
- wall section
- container
- wall
- longitudinal edge
- offset
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/60—Uniting opposed surfaces or edges; Taping
- B31B50/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/431—Joining the articles to themselves
- B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
- B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/346—Making joints having variable thicknesses in the joint area, e.g. by using jaws having an adapted configuration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
- B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
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- 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
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/52—Details
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- 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
- B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
- B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
- B65D85/72—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for for edible or potable liquids, semiliquids, or plastic or pasty materials
- B65D85/80—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for for edible or potable liquids, semiliquids, or plastic or pasty materials for milk
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
- B29C66/7232—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
- B29C66/72327—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of natural products or their composites, not provided for in B29C66/72321 - B29C66/72324
- B29C66/72328—Paper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/832—Reciprocating joining or pressing tools
- B29C66/8322—Joining or pressing tools reciprocating along one axis
- B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
- B29K2711/12—Paper, e.g. cardboard
- B29K2711/123—Coated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/60—Uniting opposed surfaces or edges; Taping
- B31B50/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding
- B31B50/642—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding using sealing jaws or sealing dies
Definitions
- the present invention relates to a thin-walled container made of a flexible base material, which is coated with an ultrasonically weldable flexible layer, the container having a first wall section, a second wall section which is arranged parallel and close to the first wall section and has a longitudinal edge, and comprises a third wall section which is arranged parallel and at least in sections closely fitting to the first wall section, has a longitudinal edge and overlaps the longitudinal edge of the second wall section in the region of its longitudinal edge, the second and third wall sections being along a welding line which runs essentially transversely to the longitudinal edges are welded to the first wall section.
- Such a container is known for example as a folding container for milk from the market.
- a flexible cardboard or a film is used as the base material, the cardboard being covered on both sides with a thin plastic layer.
- the known container is made from a one-piece sheet, which is first brought into a square and tube-like shape. The folding is carried out so that the two longitudinal edges of the sheet overlap and can be glued or welded together. In order to be able to close at least one end of the container in a liquid-tight manner, it is flattened at this end. In the area of the overlap of the longitudinal edges, three layers of the container wall are parallel and at the flattened end close together, whereas outside the overlap in the flattened area two layers of the container wall are arranged parallel to each other and close together. The layers of the container wall are then ultrasonically welded to one another in the flattened section transversely to their longitudinal edges along a welding line, so that this end of the container is closed in a liquid-tight manner.
- the object of the present invention is therefore to develop a thin-walled container of the type mentioned at the outset in such a way that its tightness is ensured for production and over the average life to be expected.
- the leak points are often in the area of the overlap.
- the ultrasonically weldable flexible layer, with which the base material is coated becomes hard during welding and a relatively brittle accumulation of material arises. This creates a zone with less flexibility in the area of the overlap. If there are mechanical loads in this area, such as deformations, bends or bends, form in cracks in the material that has become brittle and thrown up, which lead to the known leaks.
- the welding line is offset at least in the region of the overlap, the material melted during welding and subsequently hardened can be remotely milled from said bending line.
- the bending load - if present - is reduced or even eliminated in this area, which increases the service life of the welds lying in the weld line.
- a section along a bending line is bent in particular by 90 °, preferably by 180 °.
- a 90 ° turn is e.g. desired with a fold, which should result in a flat bottom.
- a turn of 180 ° is e.g. advantageous for closing the container in the upper area.
- the bending line lies in the plane formed by the container wall and possibly at a distance from the welding line by a distance in the opposite direction to the offset.
- the area of the weld seam characterized by an accumulation of material is arranged particularly clearly away from the area loaded by the bend.
- the wall sections are integrally connected to one another by one or more folds, in particular by 180 ° in each case.
- Such a thin-walled container is made of a one-piece material particularly inexpensive and yet liquid-tight due to the offset of the welding line according to the invention.
- the invention also relates to a method for producing a thin-walled container according to one of the preceding claims, which comprises the following steps:
- the welding line is offset in the area of the overlap in a plane lying in the container wall.
- a subordinate claim specifies a corresponding advantageous development of the method according to the invention, by means of which a favorable course of the welding line is achieved.
- the invention also relates to a device for producing a thin-walled container, which has an ultrasonic welding sonotrode and a counter-holder (also called “anvil”) with one during welding of the container facing working edge and also includes a front side facing the container during welding.
- Ultrasonic sonotrodes and counterholders of this type are used primarily for the production of containers for foods such as milk, juices etc.
- the temperature maximum in the workpiece during welding is reached with an ultrasonic sonotrode where the amplitude of the ultrasonic waves introduced into the workpiece reaches its maximum. This position depends on from the position of the working edge facing the container during welding.
- the working edge has an area with an offset essentially parallel to the workpiece plane. This can be implemented easily and inexpensively in the manufacture of the sonotrode, so that the desired shape of the welding line can be produced easily.
- the area with the offset in the front view has a trapezoidal basic shape.
- Such an offset is, on the one hand, easy to manufacture and avoids interruptions in the welding line due to the slowly rising and falling flanks during operation.
- the area with the offset has approximately the length of the overlap.
- the offset of the weld line is limited to the area of the overlap, which has manufacturing advantages in the further processing of the container to be manufactured.
- the amount of the offset depends essentially on the amount of plastic thrown up in the area of the overlap. However, the offset should not be as high as desired for manufacturing-related reasons. In this regard, it has proven to be advantageous for conventional containers (for example milk and juice containers) if the height of the offset is approximately 0.5 to 4 mm.
- the front of the sonotrode and / or the front of the counter-holder has a recess, the depth of the recess or the sum of the depths of the recesses roughly corresponding to the thickness of a wall section of the container to be welded.
- This enables the working edge to also lie close to the workpiece to be welded in the area of the overlap, so that the necessary pressure can be applied to the workpiece in this three-layer area and the energy can be optimally transferred from the sonotrode to the workpiece without crushing which can lead to burns of the material to be welded during welding.
- the invention also relates to a thin-walled container made of a flexible base material, which is coated with an ultrasonically weldable flexible layer, the container having a wall with at least a first wall section, a second wall section which is arranged parallel and close to the first wall section and has a longitudinal edge , and comprises a third wall section, which is arranged parallel and at least in sections closely adjacent to the first wall section, has a longitudinal edge and overlaps the longitudinal edge of the second wall section in the region of its longitudinal edge, the second and third wall sections running along a generally transverse to the longitudinal edges Weld line are welded to the first wall section.
- the weld line face at least in the area of the overlap is offset from a plane which is formed between the first and second or third wall section. In this way, the welding line and the area that is less flexible due to it can also be removed from the immediate vicinity of an existing bending line.
- FIG. 1 shows a view in the manner of an exploded perspective view of a section of a thin-walled container, a sonotrode and an anvil;
- Figure 2 is a view similar to Figure 1 from a different perspective
- FIG. 3 shows an enlarged detail view from the front of a region of the sonotrode from FIG. 1;
- Figure 4 is a perspective view of the front of the counter holder of Figure 1;
- Figure 5 is a sectional view through the container section of Figure 1;
- Figure 6 is a rear view of the container section of Figure 1.
- an upper section of a thin-walled container has the reference number 10
- a sonotrode for ultrasonic welding has the reference number 12
- a corresponding counter-holder has the reference number 14.
- the container is made from a flexible base material 16, in the present case a thin cardboard. The material is coated on both sides with an ultrasonically weldable flexible plastic which bears the reference symbol 18 in FIG.
- the container could also be made of a plastic material, for example a plastic film. In this case - provided that the plastic can be welded - a special coating could be dispensed with.
- the upper portion 10 of the container comprises a first wall portion 20, a second wall portion 22 and a third wall portion 24. All three wall sections 20, 22 and '24 are connected by folds 26 and 28 by 180 ° together in one piece.
- the second wall section 22 lies closely against the first wall section 20 and is arranged parallel to the latter.
- the same also applies to the third wall section 24, with the exception that this overlaps a longitudinal edge 32 (FIG. 2) of the second wall section 22 in the region of its longitudinal edge 30, that is to say no longer lies closely against the first wall section 20 in this region.
- the overlap formed in the area of the longitudinal edges 30 and 32 of the second wall section 22 and the third wall section 24 bears the reference number 34.
- a cross-hatched weld line 36 runs in the area of the upper section 10 of the container transversely to the longitudinal edges 30 and 32 of the wall sections 22 and 24, along which the plastic coating 18 of the carton 16 at least partially melted, thrown up and hardened again.
- the welding line 36 that is to say the area in which the maximum temperature is reached during the welding process, is offset in the area of the overlap 34 upwards in a trapezoidal manner.
- the offset area like the rest of the welding line, is located in a plane 38 formed by the container wall 20, 22, and 24. That area of the welding line 36 that is offset bears the reference symbol 40.
- the height of the offset 40 depends on the the amount of material thrown up during welding and is usually 0.5 to 4 mm.
- the upper section 10 of the container shown in the drawing is bent over a bending line 42 shown in broken lines by 180 °.
- the bending line 42 also lies in the plane 38 and - apart from the flanks of the area 40 - parallel to the welding line 36. However, it is spaced apart from the welding line 36 by a distance a from the welding line 36, contrary to the “bulge” formed by the offset 40 ,
- the distance a is usually about 0.5 to 5 mm.
- the bending line 42 runs in the area of the overlap 34 due to the offset 40 outside the welding line 36, that is also outside the welded areas.
- the weld seam between the wall sections 20, 22 and 24, which is less flexible due to the material attachment by the melt, is less or not at all stressed by the bending, so that the hardened melt of the plastic coating 18 does not tear due to the bending can. This creates a considerably increased security against leakage of the container at this point.
- Offset 40 removes the center of the melt formation from the bending line 42.
- the sonotrode 12 has a front side 43 facing the upper section 10 of the container during welding, which is rounded in part-circle in cross-section in its upper and lower area, but forms a working edge 44 at the joints of the two areas. In its lateral center, the working edge 44 has an area with an offset 46 drawn up perpendicularly to the sonotrode plane, which has a trapezoidal basic shape in the view shown in FIGS. 1 and 3.
- the upper section 10 of the container is clamped between the working edge 44 of the sonotrode 12 and the front side 48 of the counter holder 14.
- the sonotrode 12 and the counter-holder 14 are arranged so that
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
A thin-walled container is produced from a flexible base material (16), covered with a flexible layer (18) which may be welded by ultrasound. Said container comprises a first wall section (20) and a second wall section (22) which is arranged parallel and close to the first wall section (20) with a longitudinal edge (32). Furthermore a third wall section (24) is provided, which is arranged parallel to and at least partly lies close to the first wall section (20), has a longitudinal edge (30) and at least partly overlaps the longitudinal edge (32) of the second wall section (22) in the region of the longitudinal edge (30) thereof. The second wall section (22) and the third wall section (24) are welded to the first wall section (20) along a weld line (36) running overall transverse to the longitudinal edges (30, 32). The weld line (36) is offset into a plane (38) lying in the container wall in the region of the overlap (34) in the container.
Description
Titel: Dünnwandiger Behälter sowie Verfahren und Vorrichtung zu seiner HerstellungTitle: Thin-walled container and method and device for its production
Beschreibungdescription
Die vorliegende Erfindung betrifft einen dünnwandigen Behälter aus einem flexiblen Basismaterial, welches mit einer Ultraschall-schweißbaren flexiblen Schicht überzogen ist, wobei der Behälter einen ersten Wandabschnitt, einen zweiten Wandabschnitt, der parallel und eng anliegend zum ersten Wandabschnitt angeordnet ist und einen Längsrand aufweist, und einen dritten Wandabschnitt umfasst, der parallel und mindestens abschnittsweise eng anliegend zum ersten Wandabschnitt angeordnet ist, einen Längsrand aufweist und im Bereich seines Längsrandes den Längsrand des zweiten Wandabschnitts überlappt, wobei der zweite und der dritte Wandabschnitt entlang einer im Wesentlichen quer zu den Längsrändern verlaufenden Schweißlinie mit dem ersten Wandabschnitt verschweißt sind.The present invention relates to a thin-walled container made of a flexible base material, which is coated with an ultrasonically weldable flexible layer, the container having a first wall section, a second wall section which is arranged parallel and close to the first wall section and has a longitudinal edge, and comprises a third wall section which is arranged parallel and at least in sections closely fitting to the first wall section, has a longitudinal edge and overlaps the longitudinal edge of the second wall section in the region of its longitudinal edge, the second and third wall sections being along a welding line which runs essentially transversely to the longitudinal edges are welded to the first wall section.
Ein derartiger Behälter ist z.B. als Faltbehälter für Milch vom Markt her bekannt. Als Basismaterial wird bei diesem ein flexibler Karton oder eine Folie verwendet, wobei der Karton beidseitig mit einer dünnen Kunststoffschicht überzogen ist. Der bekannte Behälter ist aus einem einstückigen Bogen hergestellt, der zunächst in eine viereckige und rohrähnliche Form gebracht wird. Die Faltung wird so durchgeführt, dass die beiden Längsränder des Bogens sich überlappen und miteinander verklebt oder verschweißt werden können. Um zumindest ein Ende des Behälters flüssigkeitsdicht verschließen zu können, ist er an diesem Ende flachgedrückt. Im Bereich des Uberlapps der Längsränder liegen somit an dem flachgedrückten Ende drei Lagen der Behälterwand parallel und
eng anliegend aneinander, wohingegen außerhalb des Uberlapps in dem flachgedrückten Bereich zwei Lagen der Behälterwand parallel zueinander und eng anliegend angeordnet sind. Die Lagen der Behälterwand werden nun in dem flachgedrückten Abschnitt quer zu ihren Längsrändern entlang einer Schweißlinie durch Ultraschall miteinander verschweißt, so dass dieses Ende des Behälters flüssigkeitsdicht verschlossen ist .Such a container is known for example as a folding container for milk from the market. A flexible cardboard or a film is used as the base material, the cardboard being covered on both sides with a thin plastic layer. The known container is made from a one-piece sheet, which is first brought into a square and tube-like shape. The folding is carried out so that the two longitudinal edges of the sheet overlap and can be glued or welded together. In order to be able to close at least one end of the container in a liquid-tight manner, it is flattened at this end. In the area of the overlap of the longitudinal edges, three layers of the container wall are parallel and at the flattened end close together, whereas outside the overlap in the flattened area two layers of the container wall are arranged parallel to each other and close together. The layers of the container wall are then ultrasonically welded to one another in the flattened section transversely to their longitudinal edges along a welding line, so that this end of the container is closed in a liquid-tight manner.
Bei dem bekannten Behälter hat sich jedoch herausgestellt, dass er im Laufe seines "Lebens" oftmals im Bereich der ursprünglich flüssigkeitsdichten Verschweißung aufbricht, also undicht wird. Dies insbesondere dann, wenn im Bereich der Verschweißung bei der Weiterverarbeitung und beim späteren Gebrauch eine Biegung oder Abkantung längs einer Biegelinie durchgeführt wird.In the case of the known container, however, it has been found that it often breaks open in the course of its "life" in the area of the originally liquid-tight weld, that is to say it leaks. This is particularly the case when a bend or bend is carried out along a bending line in the area of welding during further processing and later use.
Die vorliegende Erfindung hat daher die Aufgabe, einen dünnwandigen Behälter der eingangs genannten Art so weiter zu bilden, dass seine Dichtheit für die Produktion und über die durchschnittlich zu erwartende Lebensdauer gewährleistet ist.The object of the present invention is therefore to develop a thin-walled container of the type mentioned at the outset in such a way that its tightness is ensured for production and over the average life to be expected.
Diese Aufgabe wird dadurch gelöst, dass die Schweißlinie im Bereich des Uberlapps in einer in der Behälterwand liegenden Ebene versetzt ist.This object is achieved in that the weld line in the area of the overlap is offset in a plane lying in the container wall.
Erfindungsgemäß wurde erkannt, dass die Undichtigkeitsstellen häufig im Bereich des Uberlapps liegen. Einer der Gründe hierfür ist, dass die ultraschall-schweißbare flexible Schicht, mit der das Basismaterial überzogen ist, beim Verschweißen hart wird und eine relativ spröde Materialanhäufung entsteht. Hierdurch wird im Bereich des Uberlapps eine Zone mit geringerer Flexibilität geschaffen. Kommt es nun zu mechanischen Belastungen in diesem Bereich, z.B. Verformungen, Biegungen oder Abkantungen, bilden sich in
dem spröde gewordenen und aufgeworfenen Material Risse, welche zu den bekannten Undichtigkeiten führen.According to the invention it was recognized that the leak points are often in the area of the overlap. One of the reasons for this is that the ultrasonically weldable flexible layer, with which the base material is coated, becomes hard during welding and a relatively brittle accumulation of material arises. This creates a zone with less flexibility in the area of the overlap. If there are mechanical loads in this area, such as deformations, bends or bends, form in cracks in the material that has become brittle and thrown up, which lead to the known leaks.
Erfindungsgemäß wurde nun erkannt, dass dann, wenn die Schweißlinie mindestens im Bereich des Uberlapps versetzt ist, das beim Schweißen geschmolzene und anschließend hart gewordene Material von der besagten Biegelinie ferngeahlten werden kann. Hierdurch wird die Biegebelastung - sofern vorhanden - in diesem Bereich reduziert oder sogar eliminiert, was die Lebensdauer der in der Schweißlinie liegenden Schweißnähte erhöht.According to the invention, it has now been recognized that if the welding line is offset at least in the region of the overlap, the material melted during welding and subsequently hardened can be remotely milled from said bending line. As a result, the bending load - if present - is reduced or even eliminated in this area, which increases the service life of the welds lying in the weld line.
Vorteilhafte Weiterbildungen der Erfindung sind in Unteransprüchen angegeben:Advantageous developments of the invention are specified in the subclaims:
Bei einer Weiterbildung ist ein Abschnitt entlang einer Biegelinie insbesondere um 90°, vorzugsweise um 180° umgebogen. Ein Umbug um 90° ist z.B. bei einer Faltung gewünscht, welche einen flachen Boden ergeben soll. Ein Umbug um 180° ist z.B. zum Verschließen des Behälters im oberen Bereich vorteilhaft.In a further development, a section along a bending line is bent in particular by 90 °, preferably by 180 °. A 90 ° turn is e.g. desired with a fold, which should result in a flat bottom. A turn of 180 ° is e.g. advantageous for closing the container in the upper area.
Bei einer anderen Weiterbildung liegt die Biegelinie in der durch die Behälterwand gebildeten Ebene und ggf. von der Schweißlinie um eine Distanz in entgegengesetzter Richtung zum Versatz beabstandet . Hierbei ist der durch eine Materialanhäufung gekennzeichnete Bereich der Schweißnaht besonders deutlich von dem durch die Biegung belasteten Bereich entfernt angeordnet.In another development, the bending line lies in the plane formed by the container wall and possibly at a distance from the welding line by a distance in the opposite direction to the offset. In this case, the area of the weld seam characterized by an accumulation of material is arranged particularly clearly away from the area loaded by the bend.
Bei einer Weiterbildung der Erfindung sind die Wandabschnitte durch eine oder mehrere Faltungen, insbesondere um jeweils 180°, einstückig miteinander verbunden. Ein solcher dünnwandiger Behälter aus einem einstückigen Material ist
besonders preiswert und aufgrund des erfindungsgemäßen Versatzes der Schweißlinie dennoch flüssigkeitsdicht.In a development of the invention, the wall sections are integrally connected to one another by one or more folds, in particular by 180 ° in each case. Such a thin-walled container is made of a one-piece material particularly inexpensive and yet liquid-tight due to the offset of the welding line according to the invention.
Die Erfindung betrifft auch ein Verfahren zur Herstellung eines dünnwandigen Behälters nach einem der vorhergehenden Ansprüche, welches folgende Schritte umfasst:The invention also relates to a method for producing a thin-walled container according to one of the preceding claims, which comprises the following steps:
a) Anordnen eines einen Längsrand aufweisenden zweiten Wandabschnitts parallel und eng anliegend an einen ersten Wandabschnitt; b) Anordnen eines einen Längsrand aufweisenden dritten Wandabschnitts parallel und zumindest bereichsweise eng anliegend an den ersten Wandabschnitt, derart, dass sein Längsrand zumindest bereichsweise den Längsrand des zweiten Wandabschnitts überlappt; c) Verschweißen der Randabschnitte entlang einer im Wesentlichen quer zu den Längsrändern verlaufenden Schweißlinie .a) arranging a second wall section having a longitudinal edge parallel and closely fitting to a first wall section; b) arranging a third wall section having a longitudinal edge parallel and at least partially closely fitting to the first wall section, such that its longitudinal edge overlaps the longitudinal edge of the second wall section at least partially; c) welding the edge sections along a welding line which runs essentially transversely to the longitudinal edges.
Um einen während der Produktion und über seine gesamte Lebensdauer flüssigkeitsdichten Behälter herstellen zu können, wird erfindungsgemäß vorgeschlagen, dassIn order to be able to produce a container that is liquid-tight during production and over its entire service life, the invention proposes that
d) die Schweißlinie im Bereich des Uberlapps in einer in der Behälterwand liegenden Ebene versetzt wird.d) the welding line is offset in the area of the overlap in a plane lying in the container wall.
In einem Unteranspruch ist eine entsprechende vorteilhafte Weiterbildung des erfindungsgemäßen Verfahrens angegeben, durch die ein günstiger Verlauf der Schweißlinie erreicht wird.A subordinate claim specifies a corresponding advantageous development of the method according to the invention, by means of which a favorable course of the welding line is achieved.
Die Erfindung betrifft schließlich auch eine Vorrichtung zur Herstellung eines dünnwandigen Behälters, welche eine Ultraschall-Schweißsonotrode und einen Gegenhalter (auch "Amboss" genannt) mit einer beim Verschweißen dem Behälter
zugewandten Arbeitskante und einer ebenfalls beim Verschweißen dem Behälter zugewandten Vorderseite umfasst.Finally, the invention also relates to a device for producing a thin-walled container, which has an ultrasonic welding sonotrode and a counter-holder (also called "anvil") with one during welding of the container facing working edge and also includes a front side facing the container during welding.
Derartige Ultraschall-Sonotroden und Gegenhalter werden vor allem zur Herstellung von Behältern für Lebensmittel, wie Milch, Säfte etc. verwendet. Das Temperaturmaximum im Werkstück beim Verschweißen wird mit einer Ultraschall- Sonotrode dort erreicht, wo die Amplitude der in das Werkstück eingebrachten Ultraschallwellen ihr Maximum erreicht. Diese Position hängt u.a. von der Position der beim Verschweißen dem Behälter zugewandten Arbeitskante ab.Ultrasonic sonotrodes and counterholders of this type are used primarily for the production of containers for foods such as milk, juices etc. The temperature maximum in the workpiece during welding is reached with an ultrasonic sonotrode where the amplitude of the ultrasonic waves introduced into the workpiece reaches its maximum. This position depends on from the position of the working edge facing the container during welding.
Um nun den bei dem eingangs genannten dünnwandigen Behälter vorgesehenen Versatz der Schweißlinie erzeugen zu können, wird für die in oben genannte Vorrichtung vorgeschlagen, dass die Arbeitskante einen Bereich mit einem Versatz im wesentlichen parallel zur Werkstückebene aufweist. Dieser ist bei der Herstellung der Sonotrode einfach und preiswert zu realisieren, so dass die gewünschte Form der Schweißlinie einfach erzeugt werden kann.In order to be able to generate the offset of the welding line provided for the thin-walled container mentioned at the outset, it is proposed for the device mentioned in the above that the working edge has an area with an offset essentially parallel to the workpiece plane. This can be implemented easily and inexpensively in the manufacture of the sonotrode, so that the desired shape of the welding line can be produced easily.
Bei einer Weiterbildung der erfindungsgemäßen Vorrichtung hat der Bereich mit dem Versatz in der Vorderansicht trapezförmige Grundform. Ein solcher Versatz ist einerseits einfach herzustellen und vermeidet durch die langsam an- und absteigenden Flanken im Betrieb Unterbrechungen der Schweißlinie .In a development of the device according to the invention, the area with the offset in the front view has a trapezoidal basic shape. Such an offset is, on the one hand, easy to manufacture and avoids interruptions in the welding line due to the slowly rising and falling flanks during operation.
Dabei ist vorteilhaft, wenn der Bereich mit dem Versatz in etwa die Länge des Uberlapps hat. Hierdurch wird der Versatz der Schweißlinie auf den Bereich des Uberlapps beschränkt, was fertigungstechnische Vorteile bei der Weiterbearbeitung des herzustellenden Behälters hat.It is advantageous if the area with the offset has approximately the length of the overlap. As a result, the offset of the weld line is limited to the area of the overlap, which has manufacturing advantages in the further processing of the container to be manufactured.
Die Höhe des Versatzes richtet sich im wesentlichen nach der Menge des im Bereich des Uberlapps aufgeworfenen Kunststoffs.
Beliebig hoch sollte der Versatz aber aus im Zusammenhang mit der Weiterverarbeitung stehenden fertigungstechnischen Gründen nicht sein. Als günstig hat sich in dieser Hinsicht für übliche Behälter (z.B. Milch- und Saftbehälter) erwiesen, wenn die Höhe des Versatzes ungefähr 0,5 bis 4 mm beträgt.The amount of the offset depends essentially on the amount of plastic thrown up in the area of the overlap. However, the offset should not be as high as desired for manufacturing-related reasons. In this regard, it has proven to be advantageous for conventional containers (for example milk and juice containers) if the height of the offset is approximately 0.5 to 4 mm.
Weiter ist angegeben, dass die Vorderseite der Sonotrode und/oder die Vorderseite des Gegenhalters einen Rücksprung aufweist, wobei die Tiefe des Rücksprungs bzw. die Summe der Tiefen der Rücksprünge in etwa der Dicke eines Wandabschnitts des zu verschweißenden Behälters entspricht. Dies ermöglicht, dass auch im Bereich des Uberlapps die Arbeitskante dicht am zu verschweißenden Werkstück anliegt, so dass auch in diesem dreilagigen Bereich der notwendige Druck auf das Werkstück aufgebracht und die Energie optimal von der Sonotrode in das Werkstück übertragen werden kann, ohne dass Quetschungen auftreten, die beim Verschweißen zu Verbrennungen des zu verschweißenden Materials führen können.Furthermore, it is stated that the front of the sonotrode and / or the front of the counter-holder has a recess, the depth of the recess or the sum of the depths of the recesses roughly corresponding to the thickness of a wall section of the container to be welded. This enables the working edge to also lie close to the workpiece to be welded in the area of the overlap, so that the necessary pressure can be applied to the workpiece in this three-layer area and the energy can be optimally transferred from the sonotrode to the workpiece without crushing which can lead to burns of the material to be welded during welding.
Die Erfindung betrifft auch einen dünnwandigen Behälter aus einem flexiblen Basismaterial, welches mit einer ultraschallschweißbaren flexiblen Schicht überzogen ist, wobei der Behälter eine Wand mit mindestens einem ersten Wandabschnitt, einem zweiten Wandabschnitt, der parallel und eng anliegend zum ersten Wandabschnitt angeordnet ist und einen Längsrand aufweist, und einem dritten Wandabschnitt umfaßt, der parallel und mindestens abschnittsweise eng anliegend zum ersten Wandabschnitt angeordnet ist, einen Längsrand aufweist und im Bereich seines Längsrandes den Längsrand des zweiten Wandabschnitts überlappt, wobei der zweite und der dritte Wandabschnitt entlang einer insgesamt quer zu den Längsrändern verlaufenden Schweißlinie mit dem ersten Wandabschnitt verschweißt sind.The invention also relates to a thin-walled container made of a flexible base material, which is coated with an ultrasonically weldable flexible layer, the container having a wall with at least a first wall section, a second wall section which is arranged parallel and close to the first wall section and has a longitudinal edge , and comprises a third wall section, which is arranged parallel and at least in sections closely adjacent to the first wall section, has a longitudinal edge and overlaps the longitudinal edge of the second wall section in the region of its longitudinal edge, the second and third wall sections running along a generally transverse to the longitudinal edges Weld line are welded to the first wall section.
Für einen solchen Behälter wird vorgeschlagen, dass die Schweißlinie mindestens im Bereich des Uberlapps gegenüber
einer Ebene versetzt ist, die zwischen erstem und zweitem bzw. drittem Wandabschnitt gebildet ist. Auf diese Weise kann ebenfalls die Schweißlinie und der durch sie weniger flexible Bereich aus der unmittelbaren Nähe einer etwa vorhandenen Biegelinie herausgenommen werden.For such a container, it is proposed that the weld line face at least in the area of the overlap is offset from a plane which is formed between the first and second or third wall section. In this way, the welding line and the area that is less flexible due to it can also be removed from the immediate vicinity of an existing bending line.
Nachfolgend wird ein Ausführungsbeispiel der Erfindung unter Bezugnahme auf die beiliegende Zeichnung im Detail erläutert. In der Zeichnung zeigen:An exemplary embodiment of the invention is explained in detail below with reference to the accompanying drawing. The drawing shows:
Figur 1 eine Ansicht in der Art einer perspektivischen Explosionsdarstellung eines Abschnitts eines dünnwandigen Behälters, einer Sonotrode und eines Gegenhalters ;FIG. 1 shows a view in the manner of an exploded perspective view of a section of a thin-walled container, a sonotrode and an anvil;
Figur 2 eine Ansicht ähnlich Figur 1 aus einer anderen Perspektive;Figure 2 is a view similar to Figure 1 from a different perspective;
Figur 3 eine vergrößerte Detailansicht von vorne eines Bereichs der Sonotrode von Figur 1;FIG. 3 shows an enlarged detail view from the front of a region of the sonotrode from FIG. 1;
Figur 4 eine perspektivische Ansicht der Vorderseite des Gegenhalters von Figur 1;Figure 4 is a perspective view of the front of the counter holder of Figure 1;
Figur 5 eine Schnittansicht durch den Behälterabschnitt von Figur 1 ; undFigure 5 is a sectional view through the container section of Figure 1; and
Figur 6 eine Rückansicht des Behälterabschnitts von Figur 1.Figure 6 is a rear view of the container section of Figure 1.
In Figur 1 trägt ein oberer Abschnitt eines dünnwandigen Behälters das Bezugszeichen 10, eine Sonotrode zum Ultraschallschweißen das Bezugszeichen 12 und ein entsprechender Gegenhalter ("Amboss") das Bezugszeichen 14.
Wie besonders gut aus Figur 5 ersichtlich ist, ist der Behälter aus einem flexiblen Basismaterial 16 hergestellt, im vorliegenden Fall einem dünnen Karton. Beidseitig ist das Material mit einem ultraschall-schweißbaren flexiblen Kunststoff überzogen, der in Figur 5 das Bezugszeichen 18 trägt. Alternativ könnte der Behälter auch aus einem Kunststoffmaterial, z.B. einer Kunststofffolie hergestellt sein. In diesem Fall könnte - die Schweißbarkeit des Kunststoffs vorausgesetzt - auf einen speziellen Überzug verzichtet werden.In FIG. 1, an upper section of a thin-walled container has the reference number 10, a sonotrode for ultrasonic welding has the reference number 12 and a corresponding counter-holder (“anvil”) has the reference number 14. As can be seen particularly well from FIG. 5, the container is made from a flexible base material 16, in the present case a thin cardboard. The material is coated on both sides with an ultrasonically weldable flexible plastic which bears the reference symbol 18 in FIG. Alternatively, the container could also be made of a plastic material, for example a plastic film. In this case - provided that the plastic can be welded - a special coating could be dispensed with.
Der obere Abschnitt 10 des Behälters umfasst einen ersten Wandabschnitt 20, einen zweiten Wandabschnitt 22 und einen dritten Wandabschnitt 24. Alle drei Wandabschnitte 20, 22 und' 24 sind durch Faltungen 26 und 28 um jeweils 180° einstückig miteinander verbunden. Der zweite Wandabschnitt 22 liegt eng am ersten Wandabschnitt 20 an und ist parallel zu diesem angeordnet. Gleiches gilt auch für den dritten Wandabschnitt 24, mit der Ausnahme, dass dieser im Bereich seines Längsrandes 30 einen Längsrand 32 (Figur 2) des zweiten Wandabschnitts 22 überlappt, in diesem Bereich also nicht mehr eng am ersten Wandabschnitt 20 anliegt. Der im Bereich der Längsränder 30 bzw. 32 des zweiten Wandabschnitts 22 bzw. des dritten Wandabschnitts 24 gebildete Überlapp trägt das Bezugszeichen 34.The upper portion 10 of the container comprises a first wall portion 20, a second wall portion 22 and a third wall portion 24. All three wall sections 20, 22 and '24 are connected by folds 26 and 28 by 180 ° together in one piece. The second wall section 22 lies closely against the first wall section 20 and is arranged parallel to the latter. The same also applies to the third wall section 24, with the exception that this overlaps a longitudinal edge 32 (FIG. 2) of the second wall section 22 in the region of its longitudinal edge 30, that is to say no longer lies closely against the first wall section 20 in this region. The overlap formed in the area of the longitudinal edges 30 and 32 of the second wall section 22 and the third wall section 24 bears the reference number 34.
Wie besonders gut aus den Figuren 1 und 6 ersichtlich ist, verläuft im Bereich des oberen Abschnitts 10 des Behälters quer zu den Längsrändern 30 bzw. 32 der Wandabschnitte 22 bzw. 24 eine kreuzschraffiert dargestellte Schweißlinie 36, entlang der der Kunststoffüberzug 18 des Kartons 16 zumindest bereichsweise angeschmolzen, aufgeworfen und wieder verhärtet ist. Hierdurch sind die Wandabschnitte 20, 22 und 24 entlang dieser Schweißlinie 36 miteinander verbunden.
Die Schweißlinie 36, also jener Bereich, bei dem während des Schweißvorganges die maximale Temperatur erreicht wird, ist dabei jedoch im Bereich des Uberlapps 34 nach oben hin trapezartig versetzt. Der versetzte Bereich befindet sich dabei wie auch der Rest der Schweißlinie in einer durch die Behälterwand 20, 22, und 24 gebildeten Ebene 38. Jener Bereich der Schweißlinie 36, der versetzt ist, trägt das Bezugszeichen 40. Die Höhe des Versatzes 40 hängt von der beim Verschweißen aufgeworfenen Materialmenge ab und beträgt in der Regel 0,5 bis 4 mm.As can be seen particularly well from FIGS. 1 and 6, a cross-hatched weld line 36 runs in the area of the upper section 10 of the container transversely to the longitudinal edges 30 and 32 of the wall sections 22 and 24, along which the plastic coating 18 of the carton 16 at least partially melted, thrown up and hardened again. As a result, the wall sections 20, 22 and 24 are connected to one another along this welding line 36. The welding line 36, that is to say the area in which the maximum temperature is reached during the welding process, is offset in the area of the overlap 34 upwards in a trapezoidal manner. The offset area, like the rest of the welding line, is located in a plane 38 formed by the container wall 20, 22, and 24. That area of the welding line 36 that is offset bears the reference symbol 40. The height of the offset 40 depends on the the amount of material thrown up during welding and is usually 0.5 to 4 mm.
Nach dem Verschweißen wird der in der Zeichnung dargestellte obere Abschnitt 10 des Behälters um eine strichpunktiert dargestellte Biegelinie 42 um 180° umgebogen. Die Biegelinie 42 liegt dabei ebenfalls in der Ebene 38 und - bis auf die Flanken des Bereichs 40 - parallel zur Schweißlinie 36. Sie ist jedoch von der Schweißlinie um eine Distanz a entgegen der durch den Versatz 40 gebildeten "Ausbuchtung" von der Schweißlinie 36 beabstandet. Die Distanz a beträgt üblicherweise ungefähr 0,5 bis 5 mm.After welding, the upper section 10 of the container shown in the drawing is bent over a bending line 42 shown in broken lines by 180 °. The bending line 42 also lies in the plane 38 and - apart from the flanks of the area 40 - parallel to the welding line 36. However, it is spaced apart from the welding line 36 by a distance a from the welding line 36, contrary to the “bulge” formed by the offset 40 , The distance a is usually about 0.5 to 5 mm.
Wie aus den Figuren 1 und 6 ersichtlich ist, verläuft die Biegelinie 42 im Bereich des Uberlapps 34 aufgrund des Versatzes 40 außerhalb der Schweißlinie 36, also auch außerhalb der verschweißten Bereiche. Auf diese Weise wird die Schweißnaht zwischen den Wandabschnitten 20, 22 und 24, die aufgrund der Materialanhäfung durch die Schmelze weniger flexibel ist, durch das Umbiegen weniger oder sogar überhaupt nicht belastet, so dass die hart gewordene Schmelze des KunststoffÜberzugs 18 durch das Umbiegen nicht reißen kann. Hierdurch wird eine erheblich erhöhte Sicherheit gegenüber einer Undichtigkeit des Behälters an dieser Stelle geschaffen .As can be seen from FIGS. 1 and 6, the bending line 42 runs in the area of the overlap 34 due to the offset 40 outside the welding line 36, that is also outside the welded areas. In this way, the weld seam between the wall sections 20, 22 and 24, which is less flexible due to the material attachment by the melt, is less or not at all stressed by the bending, so that the hardened melt of the plastic coating 18 does not tear due to the bending can. This creates a considerably increased security against leakage of the container at this point.
Es sei jedoch hier ausdrücklich darauf hingewiesen, dass die erfindungsgemäßen Vorteile auch bereits bei einem geringeren
Versatz 40 erhalten werden können. Wesentlich ist, dass durch den Versatz 40 der Schweißlinie 36 das Zentrum der Schmelzebildung aus der Biegelinie 42 herausgenommen wird.However, it should be expressly pointed out here that the advantages according to the invention are already at a lower level Offset 40 can be obtained. It is essential that the offset 40 of the welding line 36 removes the center of the melt formation from the bending line 42.
Der in den Figuren 1 und 6 dargestellte Versatz 40 der Schweißlinie 36 wird durch eine besondere Gestaltung der Sonotrode 12 ermöglicht, welche nun erläutert wird:The offset 40 of the welding line 36 shown in FIGS. 1 and 6 is made possible by a special design of the sonotrode 12, which is now explained:
Die Sonotrode 12 weist eine beim Verschweißen dem oberen Abschnitt 10 des Behälters zugewandte Vorderseite 43 auf, welche in ihrem oberen und unteren Bereich im Querschnitt teilkreisförmig abgerundet ist, an den Stoßstellen der beiden Bereiche jedoch eine Arbeitskante 44 bildet. In ihrer lateralen Mitte weist die Arbeitskante 44 einen Bereich mit einem senkrecht zur Sonotrodenebene hochgezogenen Versatz 46 auf, der in der in den Figuren 1 und 3 dargestellten Ansicht trapezförmige Grundform hat.The sonotrode 12 has a front side 43 facing the upper section 10 of the container during welding, which is rounded in part-circle in cross-section in its upper and lower area, but forms a working edge 44 at the joints of the two areas. In its lateral center, the working edge 44 has an area with an offset 46 drawn up perpendicularly to the sonotrode plane, which has a trapezoidal basic shape in the view shown in FIGS. 1 and 3.
In der insgesamt ebenen Vorderseite 48 des Gegenhalters 14 findet sich ein Rücksprung 50 mit in der Draufsicht ebenfalls trapezförmiger Grundform (vergl . Figur 4) . Die Tiefe des Rücksprungs 50 in der Vorderseite 48 des Gegenhalters 14 entspricht in etwa der Dicke des Wandabschnitts 24. Es sei an dieser Stelle ausdrücklich darauf hingewiesen, dass ein solcher Rücksprung auch in der Sonotrode und auch in Kombination mit dem besagten Versatz vorhanden sein könnte. Eine solche Kombination ist jedoch fertigungstechnisch aufwendiger und daher kostenintensiver. Auch könnte die Vorderseite der Sonotrode insgesamt eben und diejenige des Gegenhalters mit einer Arbeitskante mit entsprechendem Versatz ausgebildet sein.In the overall flat front 48 of the counter-holder 14 there is a recess 50 with a basic shape that is also trapezoidal in plan view (see FIG. 4). The depth of the recess 50 in the front 48 of the counter-holder 14 corresponds approximately to the thickness of the wall section 24. At this point it should be expressly pointed out that such a recess could also be present in the sonotrode and also in combination with the said offset. However, such a combination is more complex in terms of production technology and therefore more expensive. The front of the sonotrode as a whole could also be flat and that of the counter holder with a working edge with a corresponding offset.
Zum Verschweißen wird der obere Abschnitt 10 des Behälters zwischen der Arbeitskante 44 der Sonotrode 12 und der Vorderseite 48 des Gegenhalters 14 verklemmt. Dabei werden die Sonotrode 12 und der Gegenhalter 14 so angeordnet, dass
For welding, the upper section 10 of the container is clamped between the working edge 44 of the sonotrode 12 and the front side 48 of the counter holder 14. The sonotrode 12 and the counter-holder 14 are arranged so that
Claims
Patentansprücheclaims
1. Dünnwandiger Behälter (10) aus einem flexiblen Basismaterial (16) , welches mit einer ultraschallschweißbaren flexiblen Schicht (18) überzogen ist, wobei der Behälter eine Wand mit mindestens einem ersten Wandabschnitt (20) , einem zweiten Wandabschnitt (22) , der parallel und eng anliegend zum ersten Wandabschnitt1. Thin-walled container (10) made of a flexible base material (16), which is coated with an ultrasonically weldable flexible layer (18), the container having a wall with at least a first wall section (20), a second wall section (22), which is parallel and close to the first wall section
(20) angeordnet ist und einen Längsrand (32) aufweist, und einem dritten Wandabschnitt (24) umfaßt, der parallel und mindestens abschnittsweise eng anliegend zum ersten Wandabschnitt (20) angeordnet ist, einen Längsrand (30) aufweist und im Bereich seines Längsrandes (30) den Längsrand (32) des zweiten Wandabschnitts (22) überlappt, wobei der zweite (22) und der dritte Wandabschnitt (26) entlang einer insgesamt quer zu den Längsrändern (30, 32) verlaufenden Schweißlinie (36) mit dem ersten Wandabschnitt (20) verschweißt sind, dadurch gekennzeichnet, dass die Schweißlinie (36) im Bereich des Uberlapps (34) einen Abschnitt (40) aufweist, der in einer in der Behälterwand (20, 22, 24) liegenden Ebene (38) versetzt ist .(20) is arranged and has a longitudinal edge (32), and comprises a third wall section (24) which is arranged parallel and at least in sections closely fitting to the first wall section (20), has a longitudinal edge (30) and in the region of its longitudinal edge ( 30) overlaps the longitudinal edge (32) of the second wall section (22), the second (22) and the third wall section (26) along a welding line (36), which is generally transverse to the longitudinal edges (30, 32), with the first wall section ( 20) are welded, characterized in that the weld line (36) in the region of the overlap (34) has a section (40) which is offset in a plane (38) lying in the container wall (20, 22, 24).
2. Dünnwandiger Behälter (10) nach Anspruch 1, dadurch gekennzeichnet, dass ein Abschnitt entlang einer Biegelinie (42) insbesondere um 90, vorzugsweise umd 180 Grad umgebogen ist.2. Thin-walled container (10) according to claim 1, characterized in that a section along a bending line (42) is bent in particular by 90, preferably by 180 degrees.
3. Dünnwandiger Behälter (10) nach Anspruch 2, dadurch gekennzeichnet, dass die Biegelinie (42) in der durch die Behälterwand (20, 22, 24) gebildeten Ebene (38) und ggf. von der Schweißlinie in entgegengesetzter Richtung zum Versatz (40) beabstandet liegt.
Dünnwandiger Behälter (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Wandabschnitte (20, 22, 24) durch eine oder mehrere Faltungen (26, 28) , insbesondere um jeweils 180 Grad, einstückig miteinander verbunden sind.3. Thin-walled container (10) according to claim 2, characterized in that the bending line (42) in the plane (38) formed by the container wall (20, 22, 24) and possibly from the welding line in the opposite direction to the offset (40 ) is spaced. Thin-walled container (10) according to one of the preceding claims, characterized in that the wall sections (20, 22, 24) are integrally connected to one another by one or more folds (26, 28), in particular by 180 degrees in each case.
Verfahren zur Herstellung eines dünnwandigen Behälters nach einem der vorhergehenden Ansprüche, welches folgende Schritte umfaßt : a) Anordnen eines einen Längsrand (32) aufweisenden zweiten Wandabschnitts (22) parallel und eng anliegend an einen ersten Wandabschnitt (20) ; b) Anordnen eines einen Längsrand (30) aufweisenden dritten Wandabschnitts (24) parallel und zumindest bereichsweise eng anliegend an den ersten Wandabschnitt (20) , derart, dass sein LängsrandA method of manufacturing a thin-walled container according to any one of the preceding claims, comprising the steps of: a) arranging a second wall section (22) having a longitudinal edge (32) in parallel and closely fitting against a first wall section (20); b) arranging a third wall section (24) having a longitudinal edge (30) parallel and at least partially closely fitting to the first wall section (20) such that its longitudinal edge
(30) zumindest bereichsweise den Längsrand (32) des zweiten Wandabschnitts (22) überlappt; c) Verschweißen der Wandabschnitte (20, 22, 24) entlang einer insgesamt quer zu den Längsrändern(30) overlaps the longitudinal edge (32) of the second wall section (22) at least in regions; c) welding the wall sections (20, 22, 24) along a total transverse to the longitudinal edges
(20, 32) verlaufenden Schweißlinie (36), dadurch gekennzeichnet, dass d) die Schweißlinie (36) im Bereich des Uberlapps (34) in einer in der Behälterwand (20, 22, 24) liegenden Ebene (38) versetzt wird.(20, 32) extending welding line (36), characterized in that d) the welding line (36) is offset in the region of the overlap (34) in a plane (38) lying in the container wall (20, 22, 24).
Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass ein Abschnitt entlang einer vorzugsweise in der Ebene (38) liegenden Verformungslinie (42) mechanisch verformt, insbesondere umgebogen wird.Method according to Claim 5, characterized in that a section is mechanically deformed, in particular bent, along a deformation line (42) which is preferably in the plane (38).
Vorrichtung zur Herstellung eines dünnwandigen Behälters (10) nach einem der Ansprüche 1 bis 4, welche eineDevice for producing a thin-walled container (10) according to one of claims 1 to 4, which a
Ultraschall-Schweißsonotrode (12) und einen Gegenhalter (14) mit einer beim Verschweißen dem Behälter (10) zugewandten Arbeitskante (44) und einer ebenfalls beim
Verschweißen dem Behälter (10) zugewandten Vorderseite (48) umfaßt, dadurch gekennzeichnet, dass die Arbeitskante (44) einen Bereich (46) mit einem Versatz im wesentlichen parallel zur Werkstückebene (38) aufweist .Ultrasonic welding sonotrode (12) and a counter-holder (14) with a working edge (44) facing the container (10) during welding and also with Welding includes the front (48) facing the container (10), characterized in that the working edge (44) has a region (46) with an offset substantially parallel to the workpiece plane (38).
8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass der Bereich (46) mit dem Versatz in der Vorderansicht eine trapezförmige Grundform hat.8. The device according to claim 7, characterized in that the area (46) with the offset in the front view has a trapezoidal basic shape.
9 . Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass die Länge des Bereichs (46) mit dem Versatz in etwa der Breite des Uberlapps (34) entspricht.9. Apparatus according to claim 8, characterized in that the length of the area (46) with the offset corresponds approximately to the width of the overlap (34).
10. Vorrichtung nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, dass die Höhe des Versatzes (46) ungefähr 0,5 bis 4 mm beträgt.10. Device according to one of claims 7 to 9, characterized in that the height of the offset (46) is approximately 0.5 to 4 mm.
11. Vorrichtung nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, dass die Vorderseite der Sonotrode und/oder die Vorderseite (48) des Gegenhalters (14) einen Rücksprung (50) aufweist, wobei die Tiefe des Rücksprungs (50) bzw. die Summe der Tiefen der Rücksprünge in etwa der Dicke eines Wandabschnitts (20, 22, 24) des zu verschweißenden Behälters (10) entspricht .11. The device according to one of claims 7 to 10, characterized in that the front of the sonotrode and / or the front (48) of the counter-holder (14) has a recess (50), the depth of the recess (50) or The sum of the depths of the recesses corresponds approximately to the thickness of a wall section (20, 22, 24) of the container (10) to be welded.
12. Dünnwandiger Behälter aus einem flexiblen Basismaterial, welches mit einer ultraschall-schweißbaren flexiblen Schicht überzogen ist, wobei der Behälter eine Wand mit mindestens einem ersten Wandabschnitt, einem zweiten Wandabschnitt, der parallel und eng anliegend zum ersten Wandabschnitt angeordnet ist und einen Längsrand aufweist, und einem dritten Wandabschnitt umfaßt, der parallel und mindestens abschnittsweise eng anliegend zum ersten Wandabschnitt angeordnet ist, einen Längsrand
aufweist und im Bereich seines Längsrandes den Längsrand des zweiten Wandabschnitts überlappt, wobei der zweite und der dritte Wandabschnitt entlang einer insgesamt quer zu den Längsrändern verlaufenden Schweißlinie mit dem ersten Wandabschnitt verschweißt sind, dadurch gekennzeichnet, dass die Schweißlinie mindestens im Bereich des Uberlapps gegenüber einer Ebene versetzt ist, die zwischen erstem und zweitem bzw. drittem Wandabschnitt gebildet ist .
12. Thin-walled container made of a flexible base material, which is coated with an ultrasonically weldable flexible layer, the container having a wall with at least a first wall section, a second wall section which is arranged parallel and close to the first wall section and has a longitudinal edge, and a third wall section, which is arranged parallel and at least in sections closely fitting to the first wall section, a longitudinal edge and in the area of its longitudinal edge overlaps the longitudinal edge of the second wall section, the second and third wall sections being welded to the first wall section along a welding line running generally transversely to the longitudinal edges, characterized in that the welding line is at least in the area of the overlap with respect to a plane is offset, which is formed between the first and second or third wall section.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10027735.7 | 2000-06-05 | ||
DE10027735A DE10027735C1 (en) | 2000-06-05 | 2000-06-05 | Thin-walled container, e.g. folded milk container, has overlapping wall sections that can be ultrasound welded transverse to their longitudinal edges, with offset section in area of overlap |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001094234A1 true WO2001094234A1 (en) | 2001-12-13 |
Family
ID=7644709
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/003696 WO2001094234A1 (en) | 2000-06-05 | 2001-03-31 | Thin-walled container and method for production thereof |
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DE (1) | DE10027735C1 (en) |
WO (1) | WO2001094234A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2006041377A1 (en) * | 2004-10-15 | 2006-04-20 | Tetra Laval Holdings & Finance S.A. | A method and an apparatus in ultrasonic sealing |
US7665276B2 (en) | 2003-11-24 | 2010-02-23 | Tetra Laval Holdings & Finance S.A. | Apparatus for sealing a package |
CN107000872A (en) * | 2014-10-31 | 2017-08-01 | Sig技术股份公司 | Device, particularly for closing by the head zone with the food containers being made by the laminate of scraping and the fringe region folded |
US10543665B2 (en) | 2014-10-31 | 2020-01-28 | Sig Technology Ag | Container precursor, in particular for the manufacture of a food container, from a laminate with a plastic gas and aroma barrier and a peeled edge region, which is partially folded back on itself |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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ATE403541T1 (en) | 2001-11-20 | 2008-08-15 | Josef Gmeiner | DEVICE AND METHOD FOR ULTRASONIC CONNECTING A MULTI-LAYER MATERIAL WEB |
DE10214405A1 (en) | 2002-03-30 | 2003-10-09 | Herrmann Ultraschalltechnik | Welding thin materials ultrasonically, e.g. for sealing food packaging film, includes a projection that moves into a recess in welding tool |
DE10227502B4 (en) * | 2002-06-19 | 2005-10-13 | Mars Incorporated | Process for the production of thin-walled containers made of film webs and production equipment for carrying out the process |
SE528872C2 (en) * | 2005-07-08 | 2007-03-06 | Tetra Laval Holdings & Finance | Cross-sealing device and method |
DE102010039003B4 (en) * | 2010-08-06 | 2014-01-16 | Telesonic Holding Ag | Device for welding and embossing thin-walled workpieces by means of ultrasound |
DE102014015959A1 (en) | 2014-10-31 | 2016-05-19 | Sig Technology Ag | Device, in particular for closing a head region of a food container, of a laminate with peeled and partially self-folded edge region |
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US5924267A (en) * | 1995-01-14 | 1999-07-20 | Sig Combibloc Gmbh | Process and a device for closing filled folded-carton packages |
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- 2000-06-05 DE DE10027735A patent/DE10027735C1/en not_active Expired - Lifetime
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US4609107A (en) * | 1984-04-16 | 1986-09-02 | Andrew McG. Martin | Easy open and reclosable bag having a separable reclosure tie |
US5924267A (en) * | 1995-01-14 | 1999-07-20 | Sig Combibloc Gmbh | Process and a device for closing filled folded-carton packages |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7665276B2 (en) | 2003-11-24 | 2010-02-23 | Tetra Laval Holdings & Finance S.A. | Apparatus for sealing a package |
WO2006041377A1 (en) * | 2004-10-15 | 2006-04-20 | Tetra Laval Holdings & Finance S.A. | A method and an apparatus in ultrasonic sealing |
CN107000872A (en) * | 2014-10-31 | 2017-08-01 | Sig技术股份公司 | Device, particularly for closing by the head zone with the food containers being made by the laminate of scraping and the fringe region folded |
JP2017538628A (en) * | 2014-10-31 | 2017-12-28 | エスアイジー テクノロジー アーゲー | Device for closing, in particular the head region, of a food container formed from a laminate having edge regions that are skived and folded |
CN107000872B (en) * | 2014-10-31 | 2019-07-12 | Sig技术股份公司 | Device, especially for closing the head zone with the food containers made of the laminate of the fringe region of scraping and folding |
US10543665B2 (en) | 2014-10-31 | 2020-01-28 | Sig Technology Ag | Container precursor, in particular for the manufacture of a food container, from a laminate with a plastic gas and aroma barrier and a peeled edge region, which is partially folded back on itself |
US10870508B2 (en) | 2014-10-31 | 2020-12-22 | Sig Technology Ag | Device, in particular for closing a top portion of a food container, consisting of a laminate with a peeled and folded-back edge region |
Also Published As
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DE10027735C1 (en) | 2001-10-25 |
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