GB1564720A - Sealing means and packaging machine - Google Patents

Sealing means and packaging machine Download PDF

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Publication number
GB1564720A
GB1564720A GB54144/76A GB5414476A GB1564720A GB 1564720 A GB1564720 A GB 1564720A GB 54144/76 A GB54144/76 A GB 54144/76A GB 5414476 A GB5414476 A GB 5414476A GB 1564720 A GB1564720 A GB 1564720A
Authority
GB
United Kingdom
Prior art keywords
sealing
anvil
webs
tool
sealing tool
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
Application number
GB54144/76A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Multivac Sepp Haggenmueller GmbH and Co KG
Original Assignee
Multivac Sepp Haggenmueller GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE19767606434 external-priority patent/DE7606434U1/en
Application filed by Multivac Sepp Haggenmueller GmbH and Co KG filed Critical Multivac Sepp Haggenmueller GmbH and Co KG
Publication of GB1564720A publication Critical patent/GB1564720A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B65B31/02—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas
    • B65B31/021—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas the containers or wrappers being interconnected
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • 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
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • 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
    • 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
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • 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
    • B29C66/81427—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 ridge, e.g. for making a weakening line; comprising a single tooth
    • 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
    • B29C66/81433—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 being toothed, i.e. comprising several teeth or pins, or being patterned
    • 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
    • B29C66/81433—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 being toothed, i.e. comprising several teeth or pins, or being patterned
    • B29C66/81435—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 being toothed, i.e. comprising several teeth or pins, or being patterned comprising several parallel ridges, e.g. for crimping
    • 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
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81457—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a block or layer of deformable material, e.g. sponge, foam, rubber
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • B29C66/82421—Pneumatic or hydraulic drives using an inflatable element positioned between the joining tool and a backing-up part
    • 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
    • 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
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83541—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws flying jaws, e.g. jaws mounted on crank mechanisms or following a hand over hand movement
    • 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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/843—Machines for making separate joints at the same time in different planes; Machines for making separate joints at the same time mounted in parallel or in series
    • B29C66/8432—Machines for making separate joints at the same time mounted in parallel or in series
    • 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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/849—Packaging machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/14—Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
    • B65B7/162—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by feeding web material to securing means
    • B65B7/164—Securing by heat-sealing
    • 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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages

Description

(54) SEALING MEANS AND PACKAGING MACHINE (71) We, MULTIVAC SEPP HAG GENMULLER KG, of 8941 Wolfertschwenden, Federal Republic of Germany a German Company, do hereby declare the invention, for which we pray that a paitent may be granted to us, and the method by which it is so be performed, to be particularly described in and by the following statement: The invention relates to a sealing means and to packaging machines including them.
A sealing means is known from e.g. German Patent 2,323,409 of the present applicant or from German Patent 1,939,216, in which two tool portions are movable with respect to one anvil to dose onto the work to be sealed, and there is a sealing tool arranged in one of Uie two portions and adapted to be moved onto the work. The other tool portion has an anvil surface against which the sealing tool pushes the work to be sealed during the fonnatiou of the seal. The materials being sealed together are portions of thin materials such as paper or film webs and the effect of the sealing is to enclose a container wholly or partly made up of those webs.
A sealing means of this kind may be used with packaging machines, especially vacuum packaging machines, such as are also known from the above mentioned; printed publications. In these the anvil surface is formed of rubber and has a smooth surface. When the webs or films are sealed the problem arises that a plastics material web or film contacting the anvil adheres to some extent to it after the sealing operation. Such adhesion can be reduced by powdering the plastics material. With goods intended for medical use such as syringes, however, powdering is impossible in view of the required degree of cleanliness.Furthermore, especially for packaging objects of this kind, paper can be used as a cover of the container, and if adhesion of the plastics material to the anvil occurs the fresh seal joints between the paper and plastics are very easily torn.
The reduction or avoidance of adhesion to the anvil is clearly desirable, and accordingly we provide a sealing means in which the anvil, which presses against rhe sealing tool to seal webs of thin packaging material between them, has a resilient contacting surface which is roughened, having protrusions and/o; depressions. When the tool and anvil are pressed together the resilience of the rough surface allows the surface to be compressed so as to produce an effectively substantially smooth surface on the anvil but which exerts uneven pressure on the webs so that the seal formed is peelable. On release of the pressure between the anvil and tool, the surface reverts unevenly to its unstressed condition arid in doing so encourages the release of the webs from the contacting surface of the anvil.This overcomes the common difficulty of the webs adhering to the anvil after sealing and at the same time produces a satisfactory but peelable seal.
Thus according to the invention, there is provided a sealing means for peelably sealing together two webs of packaging material comprising a heatable sealing tool and an anvil arranged for relative reciprocating movement to press together and seal together those webs between them, said anvil having a resilient contacting surface facing said sealing tool, and said sealing tool having a smooth surface facing said contacting surface, and wherein the said resilient contacting surface is rough, being formed of protrusions and/or depressions which cooperate with the smooth sealing surface when the two said surfaces are pressed together, with the webs to be sealed between them, to provide a substantially smooth surface exerting uneven pressure on the webs and on movement apart of the sealing tool and anvil the protrusions and/or depressions are restored to their normal position thereby ensuring disengagement of the packaging material from the said contacting surface.
Preferably, the resilient contacting surface is formed of a multiplicity of depressions and protrusions which are substantially uniformly spaced and discrete, and more preferably the resilient contacting surface is provided with elevated longitudinal and transverse zones and with pyramidal depressions or with indented longitudinal and transverse zones and with pyramidal protrusions.
There is also provided a method of peelably sealing together two webs of packaging material including positioning the webs between a smooth sealing surface of a heatable sealing tool and a resilient contacting surface of an anvil, said sealing tool and anvil being arranged for relative reciprocating movement, pressing together said sealing tool and anvil so as to seal together the webs and moving apart said sealing tool and anvil to release the sealed webs, said resilient contacting surface of the anvil being rough, being formed of protrusions and/or depressions which on pressing together the sealing tool and anvil cooperate to provide a substantially smooth surface exerting during sealing uneven pressure on the webs against the smooth sealing surface and which on moving apart the sealing tool and anvil are restored to their normal position thereby ensuring disengagement of the packaging material from the contacting surface.
A particular embodiment of the invention will now be described with reference to the accompanying drawings, wherein:- Fig. 1 is a sectional view through an embodiment of sealing means, on the line 11-11 of Figure 4, but on a larger scale and showing two portions moved apart; Fig. 2 is a plan view of the surface of the anvil; Fig. 3 is a sectional view through the anvil along line III--III of Figure 2, and Fig. 4 is a packaging machine with the front wall omitted.
Sealing means embodying she invention is to be used in a packaging machine such as that shown in Figure 4. In this, a web 4 of plastics material film is drawn from a roll 3 and guided into a forming station comprising upper and lower portions 6, 7. In this forming station successive containers 8 are formed by forming of the web after heating. The con tainers are then advanced to a filling station which is not shown and then to the sealing means 1. Where the packaging machine is a vacuum packaging machine the sealing means is a vacuum station. At the same time a web 10 which may e.g. be paper or Plastics material is drawn from a roll 9 and advanced to the sealing means 1. The web 10 is laid over the containers 8 in the sealing means and sealed thereto.After the sealing eperation the containers are separated in a separating station which is not shown.
The sealing means 1 is provided with a first and upper tool portion 12 mounted on a machine frame 11 and a second and lower tool portion 13 adapted co be raised and lowered on the frame. In the per tool portion there is provided a heatab sealing tool 14 which seals the webs 4 and 10 to one another by heat sealing at least one of the webs being of plastics material.
The sealing tool 14 is conventionally moved towards the lower tool by means of a pneumatic device 1S and is pulled back into the position shown lin Figure 1 by means of biasing means which are not shown.
At the edges of the side walls of the lower tool portion 13 which are nearest to the webs there is provided an anvil 16 in the form of a resilient strip engaged into a T-shaped recess 17 on the side walls proper. During the sealing operation the web 4 is pushed against the anvil 16 by on the one hand the pressure of the two portions 12, 13 against one another and on the other hand the pressure exerted on the anvil 16 by the sealing tool 14 through a sealing surface 23 of that tool; the webs 4 and 10 are thereby pressed together while a seal is formed between them.
The surface 18 of the anvil 16 which is presented to the web 4 has a roughened surface structure. As shown, this is formed by milling, with elevated linear transverse zones 19 and elevated linear longitudinal zones 20 and pyramidal depressions or recesses 21 formed therebetween and having respective lowest points 22. In the example of embodiment the apex angle a of the pyramid is 90 degrees and the distance a between two successive parallel linear elevations is 0.8mm.
With this structure of the surface 18 of the sealing backing 16 the elevations 1% 20 are deformed by pressure of rhe sealing tool 14 into a substantially smooth surface. After completion of the sealing operation the elastic material releases into the original position shown in Figures 2 and 3. We have found that such surface structure avoids adhesion between the web 4 and the anvil 16 or that a potential adhesion is immediately released with release of the pressure between the tool 14 and the anvil, and we have found it possible to produce packages such as formed of a nonpowered lined or coated lower film web and of an upper web consisting of paper, without any risk that the freshly formed joints would be torn by adherence connection between the lower film and the sealing backing.
Alternatively to the milled structure shown in figures 2 and 3 the linear longitudinal and transverse zones could be recessed and the pyramidal zones could be elevated. In this case too an adhesion between the sealing backing and the lower film would be avoided.
The structure shown in figures 2 and 3 comes prising elevated longitudinal and transverse zones and recessed pyramidal portions, however, provides particularly good rigidity, and furthermore the surface thus formed recovers particularly quickly to its original state.
Alternatively to the milled structure it is possible to provide the surface 18 of the anvil 16 as a knurled surface in which merely elongated elevated zones alternate with longitudinally recessed zones. With this em bodiment too, an adhesion between the lower film and the anvil is avoided: This surface, however, does not provide the same rigidity as the embodiment shown in figures 2 and 3 comprsing longitudinal and transverse interconnected elevated zones.
Silicone rubber is particularly well adapted as a material for the anvil 16. In the embodi meat shown the thickness b of the silicone rubber is about 2mm.
WHAT WE CLAIM IS: 1. A sealing means for peelably sealing together two webs of packaging material comprising a heable sealing tool and an anvil arranged for relative reciprocating movement to press together and seal together those webs between them, said anvil having a resilient contacting surface facing said sealing tool, and said sealing tool having a smooth sealing surface facing said contacting surface, and wherein the said resilient co}ltaoting surface is rough, being fonned of protrusions and/or depressions which cooperate with the smooth sealing surface when the two said surfaces are pressed together, with the webs to be sealed between therm, to provide a substantially smooth surface exerting uneven pressure on the webs and on movement apart of the sealing tool and anvil the protrusions and/or depressions are restored to their normal position thereby ensuring disengagement of packaging material from the said c < xncting surface.
2. A sealing means according to claim 1 the e resilient contacting surface is formed of a multiplicity of depressions and protrusions which are substantially uniformly spaced and discrete.
3. A sealing means according to claim 1 or claim 2 wherein the resilient cOD8aceing surface is provided with elevated Xongitudinal and transverse zones and with pyramidal depressions.
4. A sealing means according to claim 1 or claim 2 wherein the resilient contacting surface is provided with indented longitudinal and transverse zones and with pyramidal protrusions.
5. A method of peelably sealing together two webs of packaging material including positioning the webs between a smooth sealing surface of a heatable sealing tool and a resilient contacting surface of an anvil, said sealing tool and anvil being arranged for relative reciprocating movement, pressing together said sealing tool and anvil so as to seal together the webs and moving apart said sealing tool and anvil to release the sealed webs, said resilient contacting surface of the anvil being rough, being formed of protrusions and/er depressions which on pressing together the sealing tool and anvil cooperate to provide a substantially smooth surface exerting during sealing uneven pressure on the webs against the smooth sealing surface and which on moving apart the sealing tool and anvil are restored to their normal position thereby ensuring disengagement of the packaging material from the contacting surface.
6. Sealing means substantially as herein described with reference to and as illustrated in the accompanying drawings.
7. Packaging machine incorporating a sealing means according to any one of the preceding claims.
8. Method of sealing substantially as herein described with reference to and as illustrated in the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. bodiment too, an adhesion between the lower film and the anvil is avoided: This surface, however, does not provide the same rigidity as the embodiment shown in figures 2 and 3 comprsing longitudinal and transverse interconnected elevated zones. Silicone rubber is particularly well adapted as a material for the anvil 16. In the embodi meat shown the thickness b of the silicone rubber is about 2mm. WHAT WE CLAIM IS:
1. A sealing means for peelably sealing together two webs of packaging material comprising a heable sealing tool and an anvil arranged for relative reciprocating movement to press together and seal together those webs between them, said anvil having a resilient contacting surface facing said sealing tool, and said sealing tool having a smooth sealing surface facing said contacting surface, and wherein the said resilient co}ltaoting surface is rough, being fonned of protrusions and/or depressions which cooperate with the smooth sealing surface when the two said surfaces are pressed together, with the webs to be sealed between therm, to provide a substantially smooth surface exerting uneven pressure on the webs and on movement apart of the sealing tool and anvil the protrusions and/or depressions are restored to their normal position thereby ensuring disengagement of packaging material from the said c < xncting surface.
2. A sealing means according to claim 1 the e resilient contacting surface is formed of a multiplicity of depressions and protrusions which are substantially uniformly spaced and discrete.
3. A sealing means according to claim 1 or claim 2 wherein the resilient cOD8aceing surface is provided with elevated Xongitudinal and transverse zones and with pyramidal depressions.
4. A sealing means according to claim 1 or claim 2 wherein the resilient contacting surface is provided with indented longitudinal and transverse zones and with pyramidal protrusions.
5. A method of peelably sealing together two webs of packaging material including positioning the webs between a smooth sealing surface of a heatable sealing tool and a resilient contacting surface of an anvil, said sealing tool and anvil being arranged for relative reciprocating movement, pressing together said sealing tool and anvil so as to seal together the webs and moving apart said sealing tool and anvil to release the sealed webs, said resilient contacting surface of the anvil being rough, being formed of protrusions and/er depressions which on pressing together the sealing tool and anvil cooperate to provide a substantially smooth surface exerting during sealing uneven pressure on the webs against the smooth sealing surface and which on moving apart the sealing tool and anvil are restored to their normal position thereby ensuring disengagement of the packaging material from the contacting surface.
6. Sealing means substantially as herein described with reference to and as illustrated in the accompanying drawings.
7. Packaging machine incorporating a sealing means according to any one of the preceding claims.
8. Method of sealing substantially as herein described with reference to and as illustrated in the accompanying drawings.
GB54144/76A 1976-03-03 1976-12-24 Sealing means and packaging machine Expired GB1564720A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19767606434 DE7606434U1 (en) 1976-03-03 1976-03-03 SEALING STATION

Publications (1)

Publication Number Publication Date
GB1564720A true GB1564720A (en) 1980-04-10

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GB54144/76A Expired GB1564720A (en) 1976-03-03 1976-12-24 Sealing means and packaging machine

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AT (1) AT372347B (en)
BE (1) BE848929A (en)
DK (1) DK153451C (en)
FR (1) FR2342899A1 (en)
GB (1) GB1564720A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2121351A (en) * 1982-04-13 1983-12-21 Keith Stewart Inflatable structure
DE3427215A1 (en) * 1984-07-24 1986-02-06 Saar-Gummiwerk GmbH, 6619 Büschfeld METHOD AND DEVICE FOR PRODUCING JOINT SEAMS BETWEEN OVERLAPPING PARTS MADE OF ELASTOMERIC OR THERMOPLASTIC MATERIAL
WO2004083039A1 (en) * 2003-03-15 2004-09-30 Wright, Fenn & Co Limited Heat sealing apparatus
CN115743682A (en) * 2022-11-29 2023-03-07 浙江名瑞智能包装科技有限公司 Lunch box air-extracting sealing switching gas transmission mould on box supporting sealing machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019214968A1 (en) * 2019-09-30 2021-04-01 Multivac Sepp Haggenmüller Se & Co. Kg Sealing tool for a packaging machine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR991196A (en) * 1944-04-11 1951-10-01 Improvements to machines for closing multiple blister packs in cellulose acetate and equivalent plastics
CH264471A (en) * 1946-05-30 1949-10-15 Henry Bland Arthur Machine for joining sheets, in particular cellulose sheets.
DE1939216C3 (en) * 1969-08-01 1975-06-12 Kraemer & Grebe Kg, Maschinenund Modellfabrik, 3562 Wallau Device for venting and gassing packs
FR2123901A7 (en) * 1971-02-04 1972-09-15 Grace W R Ltd Vacuum packaging - in sealed thin film envelope with mouth supported by clamp allowing air escape

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2121351A (en) * 1982-04-13 1983-12-21 Keith Stewart Inflatable structure
DE3427215A1 (en) * 1984-07-24 1986-02-06 Saar-Gummiwerk GmbH, 6619 Büschfeld METHOD AND DEVICE FOR PRODUCING JOINT SEAMS BETWEEN OVERLAPPING PARTS MADE OF ELASTOMERIC OR THERMOPLASTIC MATERIAL
WO2004083039A1 (en) * 2003-03-15 2004-09-30 Wright, Fenn & Co Limited Heat sealing apparatus
CN115743682A (en) * 2022-11-29 2023-03-07 浙江名瑞智能包装科技有限公司 Lunch box air-extracting sealing switching gas transmission mould on box supporting sealing machine
CN115743682B (en) * 2022-11-29 2023-06-27 浙江名瑞智能包装科技有限公司 Cutlery box on holding in palm box capper is taken out sealed gas transmission mould that switches

Also Published As

Publication number Publication date
AT372347B (en) 1983-09-26
FR2342899A1 (en) 1977-09-30
DK153451C (en) 1989-01-09
DK153451B (en) 1988-07-18
DK529076A (en) 1977-09-04
FR2342899B1 (en) 1982-11-19
ATA881576A (en) 1981-01-15
BE848929A (en) 1977-03-16

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Effective date: 19951224