EP1178933B1 - Thin-walled container and lid, and also a method for making - Google Patents
Thin-walled container and lid, and also a method for making Download PDFInfo
- Publication number
- EP1178933B1 EP1178933B1 EP00914411A EP00914411A EP1178933B1 EP 1178933 B1 EP1178933 B1 EP 1178933B1 EP 00914411 A EP00914411 A EP 00914411A EP 00914411 A EP00914411 A EP 00914411A EP 1178933 B1 EP1178933 B1 EP 1178933B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- container
- lid
- thermoformed
- wall section
- section
- 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.)
- Expired - Lifetime
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Classifications
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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
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
- B65D1/26—Thin-walled containers, e.g. formed by deep-drawing operations
-
- 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
- B65D43/0229—Removable lids or covers without integral tamper element secured by rotation only on the inside, or a part turned to the inside, 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
- 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
- B65D43/00—Lids or covers for rigid or semi-rigid containers
- B65D43/02—Removable lids or covers
- B65D43/0235—Removable lids or covers with integral tamper element
- B65D43/0277—Removable lids or covers with integral tamper element secured by rotation before removal of the tamper element
- B65D43/0281—Removable lids or covers with integral tamper element secured by rotation before removal of the tamper element only on the inside, or a part turned to the inside, 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
- B65D43/00—Lids or covers for rigid or semi-rigid containers
- B65D43/02—Removable lids or covers
- B65D43/0235—Removable lids or covers with integral tamper element
- B65D43/0277—Removable lids or covers with integral tamper element secured by rotation before removal of the tamper element
- B65D43/0283—Removable lids or covers with integral tamper element secured by rotation before removal of the tamper element 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
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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
- B65D2543/00—Lids or covers essentially for box-like containers
- B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
- B65D2543/00425—Lids or covers welded or adhered to the container
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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
- 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
- B65D2543/0049—Contact between the container and the lid on the inside or the outside of the container on the inside, or a part turned to the inside of the mouth of the container
- B65D2543/00509—Cup
-
- 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
- B65D2543/0049—Contact between the container and the lid on the inside or the outside of the container on the inside, or a part turned to the inside of the mouth of the container
- B65D2543/00527—NO contact
-
- 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
- B65D2543/00444—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
- B65D2543/00555—Contact between the container and the lid on the inside or the outside of the container on both the inside and the outside
-
- 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 present invention relates to a container and a lid of thin-walled plastic, which are provided with screw threads.
- the invention also relates to a method of being able to produce such a container and such a lid cheaply.
- Plastic is often a preferred material in connection with packagings, above all thanks to plastic's good barrier properties, i.e. the fact that it is impermeable.
- Liquid-tight plastic packagings of this kind are however relatively expensive if they are provided with threads. It is not possible to manufacture threaded plastic containers cheaply using the prior art. The reason for this is that according to the prior art, injection moulding is used to manufacture such containers. The tools for injection moulding are expensive and complicated to produce, since spark machining is necessary. As a consequence of this, it is attempted to avoid too much machining, which means that the material thickness is often permitted to be greater than the strength actually demands.
- a major advantage of a container according to the invention is that, thanks to the method of manufacture, the sealing face is completely smooth, in contrast to containers which are produced by means of other methods, for example mould blowing, die casting, in which a discontinuity is always formed in the parting line between the mould parts. Thanks to the invention, a smooth sealing face is thus ensured without edges/burrs.
- the container is, except for on the threads 5, rotationally symmetrical (which is not however necessary) around the axis of symmetry 9.
- the closure part 3 also has an annular sealing face 7, which is continuously smooth or devoid of discontinuities.
- the sealing face 7 is arranged rotationally symmetrically around the axis of symmetry 9 and has a normal which is essentially parallel to the axis of symmetry.
- the sealing face 7 is also disposed between the wall section 4 of the container part 1 and an upper wall section 14, which upper wall section 14 has a greater diameter than the wall section 4.
- the free end 13 of the collar 10 has the largest diametrical dimension of the container and thereby providing that the sealing face 7 is arranged inside of said free end 13.
- Fig. 2 shows the lid 20 for the container in Fig. 1.
- the material in the lid is preferably the same as in the related container.
- the lid 20 comprises a closure part 22, which is provided in a collar-like section with internal threads 26, corresponding to the threads 5 in Fig. 1, and an essentially level lid part 24 with an underside 24A and an upper side 24B.
- the closure part 22 also comprises an annular section/a sealing face 28 which is continuously smooth or devoid of discontinuities and is arranged in a transition zone 30 between the lid part 24 and the closure part 22.
- Both the lid part 24 and the sealing face 28 are disposed rotationally symmetrically around an axis of symmetry 9.
- the sealing face 28 consists of an annular section which projects, i.e. forms a sealing ridge, below the underside 24A of the lid part. This construction provides rigidity at the same time as it leads to effective sealing between the sealing face 28 of the lid and the corresponding sealing face 7 of the container.
- the wall section 32 of the lid has a longer vertical extension than the corresponding upper wall section 14 of the container, due to which the lid can be screwed so far down onto the container that the sealing face 28 of the lid is pressed together with the sealing face 7 of the container, without any risk that the upper edge 12 of the container shall come into contact with the corresponding part 34 of the lid 20.
- the sheet with the formed articles is ejected from the forming tool to be moved to the subsequent punching operation.
- Ejection from the forming tool is normally effected by means of so-called ejectors, which are separate units interacting with the forming tool.
- said ejector tools can be eliminated by using the threads to eject the sheet. This is carried out by rotating the threaded part of each form in the forming tool. This can be achieved either by rotating the entire form area or by only rotating the threaded part.
- the advantage of only rotating the threaded part is that the container part 1 can then be allowed to assume shapes which are not rotationally symmetrical, for example a hexagonal shape, which results in a certain stiffening.
- the invention is not restricted to the embodiments shown, but can be varied within the scope of the following claims. It is perceived for example that the number of thread ridges can be varied within wide limits, all the way from one to a multiplicity. Furthermore, it is perceived that many conceivable shapes other than hexagonal containers 1 can be manufactured according to the method according to the invention, for example triangular, star-shaped etc. In addition, it is perceived that the collar can be arranged to extend a substantial distance, it being possible in an extreme case, with a downwardly directed collar, that the threads would be able to be arranged around the lower part of the container.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Closures For Containers (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
Description
- The present invention relates to a container and a lid of thin-walled plastic, which are provided with screw threads. The invention also relates to a method of being able to produce such a container and such a lid cheaply.
- Plastic is often a preferred material in connection with packagings, above all thanks to plastic's good barrier properties, i.e. the fact that it is impermeable. Another requirement of many packagings, primarily in the food industry, is that they must be liquid-tight in the closure between the lid and container. Liquid-tight plastic packagings of this kind are however relatively expensive if they are provided with threads. It is not possible to manufacture threaded plastic containers cheaply using the prior art. The reason for this is that according to the prior art, injection moulding is used to manufacture such containers. The tools for injection moulding are expensive and complicated to produce, since spark machining is necessary. As a consequence of this, it is attempted to avoid too much machining, which means that the material thickness is often permitted to be greater than the strength actually demands. In addition, in injection moulding joints are formed along the mould parts, joints which require that an extra pressing pressure must be able to be applied to the sealing face in order that the packaging shall not leak, which in turn also results in a need for material reinforcement. An increased material thickness naturally entails increased material consumption, which gives an increase in price.
- In many situations, one is forced owing to cost reasons to compromise with regard to the hermetic closing capacity of the plastic container, with the aim of obtaining a sufficiently low price. Plastic packagings for salads of various types are a typical example in which such a compromise is often made. Thus a plastic container with threads is not used here, but a plastic container closed by a lid with a snap-in fastener. The container and lid are manufactured from thin-walled plastic by means of thermoforming, for example by means of vacuum technology. Containers of this kind occur very frequently thanks to their low price, which is a consequence of the fact that the tools for thermoforming are very cheap, as they can be manufactured by means of conventional, cheap machining methods, for example cutting. In addition, the starting material for the container is cheap and the material consumption low. The material thickness of the starting material is always less in principle than 0.9 mm and more often than not is as thin as approx. 0.3-0.4 mm. The disadvantage of such containers is that the sealing capacity, between a snap-in lid and the container, is not always reliable. Thus there is a risk of such containers leaking, above all when they are exposed to stress or when they are inclined or turned over, which is naturally a major disadvantage.
- As an example, US 5,628,417 shows a plastic container with a plastic lid, with a threaded closure, which is manufactured according to a conventional forming method, with separable mould parts. Both the container and lid will therefore be relatively thick-walled and will have edges/burrs which obstruct sealing in the areas of the joints between the mould parts.
- A threaded cap for a bottle is known from 4,099,903, which cap is manufactured by moulding of a plastic film on a tool. Following moulding, the tool is rotated so that the cap can be released from it. The shape of the cap is specially adapted for bottles, which bottles are manufactured according to other, known methods.
- From US 3290418 there is known a thermo-formed container and lid made from thin-walled plastic, which partly eliminates some of the problems mentioned above. However, the method for producing the known container is complex, i.a. requiring the use of a flexible insert. Moreover the known container uses the upper free end of the collar of the container to achieve an annular sealing face, which implies numerous disadvantages, e.g. difficulties in obtaining a smooth sealing surface.
- The aim of the present invention is to eliminate or at least minimize the above problems, which is achieved by means of a container and a lid according to
claim 1. - By means of the method used for manufacturing the container, the great advantage is gained that an impermeable container with hermetically closing lid can be manufactured at very low cost in relation to existing plastic containers. In addition, they can be manufactured in a recyclable material and are easy to compress following use, which are further advantages.
- A major advantage of a container according to the invention is that, thanks to the method of manufacture, the sealing face is completely smooth, in contrast to containers which are produced by means of other methods, for example mould blowing, die casting, in which a discontinuity is always formed in the parting line between the mould parts. Thanks to the invention, a smooth sealing face is thus ensured without edges/burrs.
- The invention also relates to a method of manufacture of the container and/or lid according to the above, thermoforming being used, a thin-walled plastic material being used as the starting material.
- The invention will be described below with reference to the figures, in which:
- Fig. 1
- shows a container according to a preferred embodiment of the invention,
- Fig. 2
- shows a lid according to a preferred embodiment of the invention,
- Fig. 3
- shows the container in Fig. 1 with the lid in Fig. 2,
- Fig. 4
- shows an alternative lid for the container in Fig. 1,
- Fig. 5
- shows a container with a lid according to a second embodiment of the invention,
- Fig. 6
- shows a container with a lid according to a third embodiment of the invention,
- Fig. 7
- shows a container with a lid according to a fourth embodiment of the invention,
- Fig. 8
- shows a container with a lid according to a fifth embodiment of the invention,
- Fig. 9
- shows a container with a lid according to a sixth embodiment of the invention,
- Fig. 10
- shows a container with a lid according to a seventh embodiment of the invention,
- Fig. 11
- shows an alternative execution, which is specially intended for large pots, a container with a lid being shown in principle from the side,
- Fig. 12
- shows a container with lid according to Fig. 11 seen from above, and
- Fig. 13
- shows an alternative execution, in principle according to Fig. 11, but also intended for smaller pots.
- Fig. 1 shows a thin-walled container with a
container part 1, an essentially levelbottom section 2 which passes via a corner area into awall section 4, together with aclosure part 3. The material for the container is synthetic, preferably a polymer material, and even more preferredly a preferably recyclable plastic material, e.g. polystyrene, polypropylene, polyethylene, polyethylene terephthalate, or polyvinyl chloride. The criteria for the choice of material are that the material shall be suitable for thermoforming under pressure or vacuum, and that it shall be approved for use in packagings for food, medicines etc., at least in cases where such application areas are current. The container is thin-walled, with a material thickness (t). - According to the invention, the
closure part 3 comprises threads 5. In the preferred embodiment shown in Fig. 1, the threads 5 are arranged in acollar 10 in the upper section of the container. The collar here forms a section directed downwards which, at a distance, encloses the upper part of thecontainer part 1, due to which theclosure part 3 forms a stiffening section for the container. Between thecollar 10 and thecontainer part 1 is theuppermost face 12 of the container, which face can be level and mainly horizontal, or can form an acute angle between thecollar 10 and thecontainer part 1. The threads 5 are hollow, since the container is manufactured by thermoforming, which means that the hollow reverse sides of the threads are visible on the inside/reverse of the collar. Due to this, the threads 5 are also deformable to a certain extent, which can be positive for the fit and sealing between the container and lid. The threads 5 are arranged such that each imaginary sectional face through thecollar 10 and parallel to a line ofsymmetry 9 usually comprises at least onethread ridge 5A. However, in certain cases the threads can be distributed in such a way that certain cross-sections do not pass through any thread ridge. Between thethread ridges 5A thecollar 10 has asmaller diameter 5B. Thefree end 13 of the collar has the greatest diameter of the container. - In the main, the container is, except for on the threads 5, rotationally symmetrical (which is not however necessary) around the axis of
symmetry 9. Theclosure part 3 also has anannular sealing face 7, which is continuously smooth or devoid of discontinuities. In the preferred embodiment, the sealingface 7 is arranged rotationally symmetrically around the axis ofsymmetry 9 and has a normal which is essentially parallel to the axis of symmetry. The sealingface 7 is also disposed between thewall section 4 of thecontainer part 1 and anupper wall section 14, whichupper wall section 14 has a greater diameter than thewall section 4. Hence, thefree end 13 of thecollar 10 has the largest diametrical dimension of the container and thereby providing that the sealingface 7 is arranged inside of saidfree end 13. - Fig. 2 shows the
lid 20 for the container in Fig. 1. The material in the lid is preferably the same as in the related container. Thelid 20 comprises aclosure part 22, which is provided in a collar-like section withinternal threads 26, corresponding to the threads 5 in Fig. 1, and an essentiallylevel lid part 24 with anunderside 24A and anupper side 24B. Theclosure part 22 also comprises an annular section/a sealingface 28 which is continuously smooth or devoid of discontinuities and is arranged in atransition zone 30 between thelid part 24 and theclosure part 22. Both thelid part 24 and the sealingface 28 are disposed rotationally symmetrically around an axis ofsymmetry 9. The sealingface 28 consists of an annular section which projects, i.e. forms a sealing ridge, below theunderside 24A of the lid part. This construction provides rigidity at the same time as it leads to effective sealing between the sealingface 28 of the lid and the corresponding sealingface 7 of the container. - The
closure part 22 also comprises an essentiallyvertical wall section 32, which is arranged rotationally symmetrically around the axis ofsymmetry 9 and arranged concentrically inside the outer, collar-like, threaded part of the closure part, with the lid'suppermost part 34 in between. Thewall section 32 passes advantageously directly into the annular section/sealingface 28, i.e. so that the lower part of the wall section will form one side wall in the sealing ridge. It is also advantageous here that thewall section 32 is mainly smooth, i.e. without deformation notches, a closing force being able to be led directly down into the sealingface 28, when a container is closed with thelid 20. - Fig. 3 shows the container according to Fig. 1 with the lid according to Fig. 2, with a couple of aspects which are important for sealing to be emphasized. The
wall section 32 of the lid has a radius smaller than that produced by the corresponding,upper wall section 14 of the container on the corresponding vertical distance. This means that, when the lid is applied to the container, agap 40 is formed between thewall sections lid 20 on thecontainer 1. Complete sealing is achieved by means of the sealing faces 7 and 28, when thelid 22 presses these against one another by means of itsthreads 26 interacting with the threads 5 of thecontainer 1. For the sealing faces 7 and 28 to seal fully against one another, thewall section 32 of the lid has a longer vertical extension than the correspondingupper wall section 14 of the container, due to which the lid can be screwed so far down onto the container that the sealingface 28 of the lid is pressed together with the sealingface 7 of the container, without any risk that theupper edge 12 of the container shall come into contact with thecorresponding part 34 of thelid 20. - Fig. 4 shows an
alternative lid 20 for the container in Fig. 1, which lid is formed so that theannular section 28, i.e. the sealingface 28 of the lid, projects below theunderside 24A of the lid only in the area adjacent to the annular section. The remaining part of the lid'sunderside 24A, i.e. the more centrally oriented section, is arranged on the other hand at a level which lies below theannular section 28. - Fig. 5 shows a second embodiment of the lid and container, in which the annular section/sealing
face 7 of thecontainer 1 has a sealing ridge, the inner side wall of which passes directly into thewall section 4 of the container part. In this embodiment, thelid 20 on the other hand has alevel sealing face 28 with a normal which is disposed parallel in the main to the axis ofsymmetry 9. It is naturally also conceivable that both the container and the lid have sealing ridges arranged against one another. This figure also illustrates that it is possible to arrange the lid and container without any gap between their adjacent, essentiallyvertical wall sections - Fig. 6 shows a third embodiment of the lid and container, in which the container is formed with a
wall section 4 which passes into abottom section 2, which bottom section is essentially rounded, i.e. the container lacks an essentially level bottom section. The embodiment is intended thereby to illustrate that the overall shape of the container is not of importance to the invention. It is also evident from Fig. 6 that complete sealing between the lid and container can be obtained when thewall section 32 of the lid has a smaller outward inclination relative to the axis ofsymmetry 9 than that produced by the container'scorresponding wall section 14A on the corresponding vertical distance. This means that, when the lid is applied to the container, agap 40 tapering downwards is formed, thewall sections upper edge 12 of the container and thelid 34, as in Fig. 3, so that less precision is required in manufacturing and better flexibility is also otherwise obtained, except in those cases when double sealing is desired. - Fig. 7 shows a fourth embodiment of the lid and container, in which the
collar 10 of the container forms a section directed upwards, so that it constitutes an extension of the container. Thecollar 10 is here internally threaded to receive a lid. Thecollar 10 has a greater diameter than thewall section 4 and the sealingface 7 is disposed in between in the same way as in Fig. 1. Thecollar 10 can also (not shown) have a section directed downwards, which encloses the threaded part at a distance. Thelid 20 is threaded externally, but nevertheless has a collar-like part 39, which is directed downwards from theupper part 34 of the lid and which encloses the threaded part at a distance, for the sake of stiffening and gripping ability. In this embodiment also thelid 20 has awall section 32, the lower end of which passes in the main directly into theannular sealing part 28. - Fig. 8 shows a fifth embodiment of the lid and container, in which the sealing
face 7 of the container consists of theuppermost face 12 of the container. Anupper wall section 14 is thereby lacking above the sealing face. Thecollar 10 is otherwise formed in the same way as in Fig. 1. On thelid 20, the sealingface 28 consists of an annular section, which is positioned radially outside, and preferably above, theunderside 24A of the lid part. The sealingface 7 of the container has a sealing ridge, the inner wall of which passes directly into thewall section 4. Thewall section 32 provides stiffening, which in certain cases is necessary for sealing between the container and lid to remain satisfactory. - Fig. 9 and 10 show two further embodiments for obtaining sealing between the
lid 20 andcontainer 1 at theuppermost face 12 of the lid. In Fig. 9, this is achieved by disposing anannular groove 41 in thesurface 12 of thecontainer 1. Thelid 20 is provided in a corresponding manner with anannularly projecting part 43, which on threading in is intended to be pressed into thegroove 41, two annular sealing sections being obtained, since the wall sections in thegroove 41 and the projectingpart 43 respectively are somewhat inclined. In addition, a similar sealing face is obtained in the transition between theupper face 12 of the container and itswall section 4, where the downwardly directedwall section 32 of the lid will lie. In Fig. 10, sealing is achieved by thelid 20 being provided in its upperannular face 34 with a projectingpart 45 intended to interact with theupper face 12 of the container part, which also forms the actual sealing face. - Fig. 11 and 12 show that the
container 1 andlid 10 can be formed with asmall lug perforation line 49 to facilitate opening of the seal. Furthermore, Fig. 11 and 12 show that larger pots can be provided advantageously with twist grips 51, 53. Thetwist grip 51 in thelid part 20 is formed as a number of projecting devices, which form a kind of bubbles 51. Foursuch bubbles 51 are best affixed in the lid part. The opening and closing direction respectively for the lid are also preferably impressed. In a corresponding manner,cavities 53 are disposed in thebottom section 2 of thecontainer 1, which form twist grips. Both thebubbles 51 and thecavities 53 are adapted in terms of size to be ergonomically correct for being gripped by means of the fingers. - Fig. 13 shows a variant of a
container 1 with alid 20, formed with twist grips 51, 53, in accordance with the principles which are evident from Fig. 11 and 12. This execution is however intended more for smaller containers, the twist grips 51, 53 not being executed as separate elements but at best on the lid consisting of an elongated ridge-shaped part, which extends diametrically a substantial distance of the lid's diameter and thetwist grip 53 in the bottom section of thecontainer 1 consisting correspondingly of an elongated recess, which also extends a substantial part of the diametrical distance, so that theridge 51 can be gripped with a thumb-finger grip and therecess 53 by one or more fingers being placed inside this, following which the lid can simply be screwed up. Furthermore, it is shown that with a form of this kind, no gripping collar around the threaded closure is necessary. Thus it is shown in the figures that theupper surface 34 of the lid part also constitutes its outermost part. Theseal container 1 andlid 20 is altogether formed essentially in accordance with what is shown in Fig. 3, and is thus also arranged rotationally symmetrically in this execution. It is shown that the outer edge of the lid and the outer edge of the container part are disposed coaxially, which can be an advantage in certain circumstances.
As already described earlier, the container and lid are manufactured by thermoforming, which is a very cost-effective method. In connection with thermoforming, also for cost reasons, a tool is designed commercially in such a way that a number of articles can be manufactured simultaneously. Thus a relatively large sheet is fed to the tool, which after suitable heating is moved forward to the tool containing a multiplicity of forms, following which the plastic sheet is sucked in by means of a vacuum, for example, and takes on the contours according to the respective form. Thanks to the forming method, optimal material utilization is achieved, i.e. roughly the same material thickness is obtained overall. It should however be understood that a certain thinning/displacement of material can occur, for example corner areas often have a somewhat smaller material thickness (often approx. 20% smaller) than sections close by, since the corner sections are furthest away from the sheet at the start of forming. This phenomenon can however be more or less eliminated in a known manner by means of special auxiliary tools, which displace the plastic material in the desired manner on forming. Following this, a certain cooling takes place to stabilize the shaped article. - In the next stage, the sheet with the formed articles is ejected from the forming tool to be moved to the subsequent punching operation. Ejection from the forming tool is normally effected by means of so-called ejectors, which are separate units interacting with the forming tool. According to the present invention, said ejector tools can be eliminated by using the threads to eject the sheet. This is carried out by rotating the threaded part of each form in the forming tool. This can be achieved either by rotating the entire form area or by only rotating the threaded part. The advantage of only rotating the threaded part is that the
container part 1 can then be allowed to assume shapes which are not rotationally symmetrical, for example a hexagonal shape, which results in a certain stiffening. To produce articles according to Figures 11 - 13, it is necessary to rotate only the threaded part, since thetwist grip parts - In certain cases, good sealing between the container and lid can cause a slight excess pressure to be formed inside the container when it is closed, in which case the container may acquire a slightly swollen appearance. So that this is not interpreted as the contents of the container having fermented, the bottom section can be formed curved slightly inwards from the start, so that it becomes more level when the container is closed. Alternatively, the container can be placed on an upwardly curving, supporting base when it is closed.
- The invention is not restricted to the embodiments shown, but can be varied within the scope of the following claims. It is perceived for example that the number of thread ridges can be varied within wide limits, all the way from one to a multiplicity. Furthermore, it is perceived that many conceivable shapes other than
hexagonal containers 1 can be manufactured according to the method according to the invention, for example triangular, star-shaped etc. In addition, it is perceived that the collar can be arranged to extend a substantial distance, it being possible in an extreme case, with a downwardly directed collar, that the threads would be able to be arranged around the lower part of the container.
Claims (29)
- Thermoformed container and lid of thin-walled plastic, with a material thickness (t) of between 0.1 and 2.0 mm, the container (1) comprising a bottom section (2) and a wall section (4), and a closure part (3), the closure part (3) comprising threads (5) and an annular sealing face (7) and the lid (20) comprising a closure part (22) and a lid part (24) with an underside (24a) and an upper side (24b), the closure part (22) comprising threads (26) and an annular sealing face (28) arranged to interact with said sealing face (7) of the container (1) to seal against each other, characterized in that the free end (13) of the collar (10) of the container (1) has the largest diametrical dimension of the container (1) and that the closure part (22) of the lid (20) comprises a stiffening wall section (32) which extends downwards from an upper face (34) of the lid and which wall section (32) is arranged inside said threads (26).
- Thermoformed container according to claim 1, characterized in that the material thickness for the threads (5) is essentially the same as the material thickness for the container part (1).
- Thermoformed container according to claim 1, characterized in that said annular sealing face (7) is devoid of discontinuities.
- Thermoformed container according to claim 3, characterized in that the sealing face (7) is disposed rotationally symmetrically around an axis of symmetry (9).
- Thermoformed container according to claim 4, characterized in that the normal to said sealing face (7) is arranged essentially parallel to said axis of symmetry (9).
- Thermoformed container according to claim 1, characterized in that said threads (5) are arranged in a collar (10), preferably arranged in the upper section of the container.
- Thermoformed container according to claim 6, characterized in that essentially each sectional area through the collar (10) parallel to the line of symmetry (9) comprises at least one thread ridge (5a).
- Thermoformed container according to claim 6, 7 or 8, characterized in that said collar (10) forms a section directed downwards, the uppermost face (12) of the container consisting of material which lies between the collar section (10) and the container part (2, 4).
- Thermoformed container according to claims 3 and 8, characterized in that the sealing face (7) consists of the uppermost face (12) of the container.
- Thermoformed container according to claims 3 and 8, characterized in that the collar section (10) is externally threaded to receive a lid, and that it encloses the sealing face (7) and preferably an upper part of the wall section (4), a stiffening closure part (3) being formed.
- Thermoformed container according to claim 6, characterized in that said collar (10) is internally threaded to receive a lid, and that it forms a section directed upwards, so that it forms an extension of the container.
- Thermoformed container according to claim 4, characterized in that the sealing face (7) is arranged on a sealing ridge, preferably between said wall section (4) and an upper wall section (14).
- Thermoformed container according to claim 12, characterized in that the wall section (4) passes in the main directly into the sealing ridge.
- Thermoformed lid according to claim 1, characterized in that the material thickness of the threads (5) is essentially the same as the material thickness for the lid part (24).
- Thermoformed lid according to claim 1, characterized in that the closure part (22) comprises a sealing face (28) arranged in a transition zone between the lid part (24) and the closure part (22).
- Thermoformed lid according to claim 15, characterized in that the sealing face (28) is arranged rotationally symmetrically around an axis of symmetry (9).
- Thermoformed lid according to claim 16, characterized in that said sealing face (28) consists of an annular section, which projects below the underside (24a) of the lid part, at least in the area adjacent to said annular section (28), so that a transition zone (30) is formed, which creates stiffening.
- Thermoformed lid according to claim 17, characterized in that said wall section (32) passes in the main directly into said annular section (28).
- Thermoformed lid according to claim 18, characterized in that said wall section (32) extends a substantial distance between said annular section (28) and the upper part (34) of the lid.
- Thermoformed lid according to claim 19, characterized in that the threads (26) are arranged in a collar, which extends downwards from said upper part (34), and which at a distance encloses said wall section (32).
- Thermoformed lid according to claim 15, characterized in that said sealing face (28) consists of an annular section, which projects outside, and preferably above, the underside (24a) of the lid part.
- A thermoformed container and lid according to claim 1, characterized in that the lid and container are each provided with a lug (47A, 47B), which is intended for welding together.
- Thermoformed container according to claim 22, characterized by a perforation line (49) for being able to tear off said lugs (47A, 47B).
- Thermoformed container according to claim 5, with a lid according to claim 18, characterized in that the wall section (32) of the lid has a smaller outward inclination relative to the vertical plane than a corresponding wall section (14) of the container.
- Thermoformed container according to claim 5, with a lid according to claim 18, characterized in that the wall section (32) of the lid has the same outward inclination relative to the vertical plane as a corresponding wall section (14) of the container.
- Thermoformed container and lid according to claim 24, characterized in that the wall section (32) of the lid has a longer vertical extension than a corresponding wall section (14) of the container, due to which the lid can be screwed onto the container so that said annular section (28) of the lid is pressed together with the sealing face (7) of the container.
- Method for the manufacture of a container and/or lid according to any of the above claims, wherein, a thin-walled plastic material in sheet form being used as the starting material, and thermoforming by means of vacuum or pressure is used in connection with manufacture, characterized in that the ready-formed pieces are first punched and then rotated out of the forming tool.
- Method for the manufacture of a container and/or lid according to any of the above claims, wherein, a thin-walled plastic material in sheet form being used as the starting material, and thermoforming by means of vacuum or pressure is used in connection with manufacture, characterized in that the threaded part of each form in the forming tool is disposed rotate ably, so that the ready-formed piece(s) can be ejected together with the sheet from the tool by said part being rotated, the ready-formed piece being lifted straight up out of the form.
- Method according to claim 28, characterized in that the finished piece is punched out of the material in sheet form following ejection from the forming tool.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9901415 | 1999-04-21 | ||
SE9901415A SE518637C2 (en) | 1999-04-21 | 1999-04-21 | Thermo-shaped container and lid made of thin-walled plastic and method of making the container and lid |
PCT/SE2000/000404 WO2000064771A1 (en) | 1999-04-21 | 2000-03-01 | Thin-walled container and lid, and also a method for making |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1178933A1 EP1178933A1 (en) | 2002-02-13 |
EP1178933B1 true EP1178933B1 (en) | 2007-01-03 |
Family
ID=20415290
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00914411A Expired - Lifetime EP1178933B1 (en) | 1999-04-21 | 2000-03-01 | Thin-walled container and lid, and also a method for making |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1178933B1 (en) |
AT (1) | ATE350293T1 (en) |
AU (1) | AU3579400A (en) |
DE (1) | DE60032763T2 (en) |
SE (1) | SE518637C2 (en) |
WO (1) | WO2000064771A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD1035446S1 (en) | 2022-11-18 | 2024-07-16 | Reynolds Presto Products Inc. | Container with lid |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7063231B2 (en) * | 2003-06-06 | 2006-06-20 | S. C. Johnson Home Storage, Inc. | Container including a bowl and a lid each having interfitting lips |
US7523839B2 (en) * | 2004-04-08 | 2009-04-28 | The Glad Products Company | Ventable spin lock container |
DE102004039814A1 (en) * | 2004-08-12 | 2006-02-23 | Huhtamaki Alf Zweigniederlassung Der Huhtamaki Deutschland Gmbh & Co. Kg | Container with lid |
JP7101516B2 (en) | 2018-03-30 | 2022-07-15 | 株式会社吉野工業所 | Container with lid |
GB2584452A (en) * | 2019-06-04 | 2020-12-09 | Paccor Packaging Gmbh | Packaging system |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3290418A (en) * | 1960-10-12 | 1966-12-06 | Harold E Best | Method and mold for making thinwalled containers |
US3759652A (en) * | 1969-05-22 | 1973-09-18 | Klm Co | Molding apparatus for making thermoformed articles |
FR2348115A1 (en) * | 1976-04-15 | 1977-11-10 | Petrov Zafir | CLOSING CAP FOR BOTTLES, ITS PRODUCTION PROCESS AND MOLDING CORE FOR THE STAMPING DIE USED FOR THIS PRODUCTION |
US4934547A (en) * | 1987-02-10 | 1990-06-19 | Helena Laboratories Corporation | Specimen collection container and non-removable cover |
US6170691B1 (en) * | 1997-10-02 | 2001-01-09 | M & M Industries, Inc. | Open-head container and lid assembly |
-
1999
- 1999-04-21 SE SE9901415A patent/SE518637C2/en not_active IP Right Cessation
-
2000
- 2000-03-01 AU AU35794/00A patent/AU3579400A/en not_active Abandoned
- 2000-03-01 EP EP00914411A patent/EP1178933B1/en not_active Expired - Lifetime
- 2000-03-01 AT AT00914411T patent/ATE350293T1/en not_active IP Right Cessation
- 2000-03-01 DE DE60032763T patent/DE60032763T2/en not_active Expired - Lifetime
- 2000-03-01 WO PCT/SE2000/000404 patent/WO2000064771A1/en active IP Right Grant
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD1035446S1 (en) | 2022-11-18 | 2024-07-16 | Reynolds Presto Products Inc. | Container with lid |
Also Published As
Publication number | Publication date |
---|---|
SE9901415L (en) | 2000-10-22 |
SE9901415D0 (en) | 1999-04-21 |
WO2000064771B1 (en) | 2000-12-21 |
WO2000064771A1 (en) | 2000-11-02 |
AU3579400A (en) | 2000-11-10 |
ATE350293T1 (en) | 2007-01-15 |
EP1178933A1 (en) | 2002-02-13 |
DE60032763D1 (en) | 2007-02-15 |
SE518637C2 (en) | 2002-11-05 |
DE60032763T2 (en) | 2007-11-08 |
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