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WO2002040263A1 - Method of sealing at least two portions of two flat bodies - Google Patents

Method of sealing at least two portions of two flat bodies Download PDF

Info

Publication number
WO2002040263A1
WO2002040263A1 PCT/IT2001/000576 IT0100576W WO0240263A1 WO 2002040263 A1 WO2002040263 A1 WO 2002040263A1 IT 0100576 W IT0100576 W IT 0100576W WO 0240263 A1 WO0240263 A1 WO 0240263A1
Authority
WO
WIPO (PCT)
Prior art keywords
elongated element
portions
head
strip
paper
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.)
Ceased
Application number
PCT/IT2001/000576
Other languages
French (fr)
Inventor
Giuseppe Motta
Erminio Diolaiti
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.)
TECNEA ENGINEERING Srl
Original Assignee
TECNEA ENGINEERING Srl
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
Application filed by TECNEA ENGINEERING Srl filed Critical TECNEA ENGINEERING Srl
Priority to AU2002222523A priority Critical patent/AU2002222523A1/en
Publication of WO2002040263A1 publication Critical patent/WO2002040263A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/62—Uniting opposed surfaces or edges; Taping by adhesives
    • 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
    • B65D85/804—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package
    • B65D85/808—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package for immersion in the liquid to release part or all of their contents, e.g. tea bags
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5007—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like characterised by the structure of said adhesive tape, threads or the like
    • B29C65/5035—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like characterised by the structure of said adhesive tape, threads or the like being in thread form, i.e. in the form of a single filament, e.g. in the form of a single coated filament
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5057—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like positioned between the surfaces 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5092—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like characterised by the tape handling mechanisms, e.g. using vacuum
    • 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
    • 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
    • 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
    • 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
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • 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
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • 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
    • B65B29/00—Packaging of materials presenting special problems
    • B65B29/02—Packaging of substances, e.g. tea, which are intended to be infused in the package
    • B65B29/028—Packaging of substances, e.g. tea, which are intended to be infused in the package packaging infusion material into filter bags
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
    • 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
    • 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
    • B29C66/70—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
    • B29C66/71—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 composition of the plastics material of the parts to be joined
    • 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
    • B29K2711/126—Impregnated
    • 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
    • B29L2031/7122—Tea bags
    • 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin

Definitions

  • the present invention relates to a method of sealing at least two portions of two flat bodies.
  • the present invention relates to a method of sealing two portions of a bag for containing an infusion substance, in particular, tea.
  • This ' method has the advantage of employing sheets of porous paper substantially comprising cellulose, which releases no harmful substances when steeped in boiling water, but has the drawback of the staples possibly working loose and, in the worst case scenario, being swallowed by the consumer in the infusion itself.
  • bags produced using this method come apart fairly easily, thus resulting in spillage of part of the product which is rendered unusable in contact with the environment .
  • a second method of manufacturing bags for infusion employs porous sheets impregnated with thermoplastic material, which, on contact with heat-sealing heads on opposite sides of the portions for sealing, melts to seal the superimposed portions as required. Bags of this sort are advantageously made of porous paper impregnated with substances such as polyethylene or polypropylene .
  • the method according to the present invention provides for obtaining bags for infusion made of porous paper substantially comprising cellulose and having no thermoplastic substances, and which ensures perfect sealing of the product inside.
  • the main object, therefore, of the present invention is a method of sealing at least two portions of two flat bodies, as claimed. in Claim 1.
  • a further object of the present invention is a head for use in a system for producing bags for infusion in accordance with the invention.
  • Yet a further object of the present invention is a teabag produced in accordance with the method which is the main object of the present invention.
  • Figure 1 shows a first sealing head for longitudinally sealing a strip of paper containing an infusion product, in particular tea, to form a substantially tubular body;
  • Figure 2 shows the operation by which the tubular body is cut and folded to form a bag containing the infusion product;
  • Figure 3 shows a second sealing head for sealing the bag formed in the Figure 2 step.
  • Figure 1 shows a first sealing head 10 forming part of a system for producing bags containing infusion substances; which system is not described in detail herein, by not being essential to a clear understanding of the present invention.
  • a strip 11 of porous paper material is fed by feed and unwinding means (not shown) in the direction of arrow FI towards sealing head 10; and dispensing means (not shown) intermittently deposit quantities ql, q2, q3 , q4 of infusion product with a predetermined spacing.
  • Folding means (not shown) fold strip 11 in the direction of arrows F2 to form a substantially tubular body 12, which continues traveling towards head 10.
  • a yarn 13 of heat-seal material e.g. polyethylene or polypropylene
  • a yarn 13 of heat-seal material is unwound off a reel 14 by known means not shown, and, by means of a guide member 15, is . run parallel to body 12 in its feed direction, i.e. the direction of arrow FI .
  • a similar elongated element e.g. in the form of a ribbon, may be used in place of yarn 13.
  • the elongated element may be made of polyethylene, polypropylene, material of vegetable origin, or a mixture of these.
  • Yarn 13 is inserted in known manner between the free portions of strip 11 when folding strip 11 in the direction of arrows F2 to form body 12. Together, the longitudinal portions of strip 11 and yarn 13 form a bead 16 for sealing by head 10.
  • Head 10 comprises a sealing device 17; and a countermember 18 located on the opposite side of bead 16 to device 17. In other words, as it is fed in the direction of arrow FI, bead 16 passes between device 17 and countermember 18.
  • countermember 18 is moved towards device 17 in the direction of arrow F3 , perpendicular to the feed direction of body 12.
  • Device 17 may be either a heat-producing or ultrasonic wave-producing device.
  • the cut portion 19 is folded in the direction of arrows F4 to form a bag 20 containing quantities ql, q2 of the infusion product, and having four portions 11, 12, 13, 14, which are sealed as shown in Figure 3.
  • the bottom f of bag 20 is folded, by means not shown, to form two pockets 20a, 20b containing quantities ql, q2 of infusion product respectively.
  • Sealing head 30 comprises a heat-producing or ultrasonic wave-producing device 31; and a countermember 32, which is moved, by means not shown, in the direction of arrow F2, i.e. perpendicular to the feed direction of bag 20.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Packages (AREA)
  • Seal Device For Vehicle (AREA)
  • Cartons (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A method of sealing at least two portions (12, 13) of two flat bodies (20, 20b), characterized by including the steps of: (a) superimposing the at least two portions (12, 13); (b) placing an elongated element (13) of thermoplastic material in contact with at least one of the two portions (12, 13); (c) melting at least one portion of the elongated element (13) to seal the two portions (12, 13) as required.

Description

METHOD OF SEALING AT LEAST TWO PORTIONS OF TWO FLAT BODIES
TECHNICAL FIELD
The present invention relates to a method of sealing at least two portions of two flat bodies.
Purely by way of example, the present invention relates to a method of sealing two portions of a bag for containing an infusion substance, in particular, tea.
The teachings of the present invention may, obviously, be applied to advantage to seal portions of any type of bag or box, of paper or cardboard. ■ BACKGROUND ART In the packaging industry, it is common practice to manufacture bags of porous material containing leaves for infusion, e.g. tea; and each bag has a thread, normally of cotton, to which a label is attached identifying the product in the bag. In practice, there are two basic methods of manufacturing such bags, a first of which comprises folding a sheet of porous paper, and folding and stapling the edges. This 'method has the advantage of employing sheets of porous paper substantially comprising cellulose, which releases no harmful substances when steeped in boiling water, but has the drawback of the staples possibly working loose and, in the worst case scenario, being swallowed by the consumer in the infusion itself. Moreover, bags produced using this method come apart fairly easily, thus resulting in spillage of part of the product which is rendered unusable in contact with the environment , A second method of manufacturing bags for infusion employs porous sheets impregnated with thermoplastic material, which, on contact with heat-sealing heads on opposite sides of the portions for sealing, melts to seal the superimposed portions as required. Bags of this sort are advantageously made of porous paper impregnated with substances such as polyethylene or polypropylene .
Though undoubtedly advantageous as compared with bags produced using the first method, bags produced using this- method have the major drawback of releasing substances into the infusion. DISCLOSURE OF INVENTION
It is an object of the present invention to provide a method of sealing at least two portions of two flat bodies, designed to eliminate the aforementioned drawbacks.
More specifically, the method according to the present invention provides for obtaining bags for infusion made of porous paper substantially comprising cellulose and having no thermoplastic substances, and which ensures perfect sealing of the product inside.
The main object, therefore, of the present invention is a method of sealing at least two portions of two flat bodies, as claimed. in Claim 1.
A further object of the present invention is a head for use in a system for producing bags for infusion in accordance with the invention.
Yet a further object of the present invention is a teabag produced in accordance with the method which is the main object of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be described with reference to the accompanying drawings, which show a non- limiting embodiment of a system illustrating the method which is the main object of the present invention, and in which:
Figure 1 shows a first sealing head for longitudinally sealing a strip of paper containing an infusion product, in particular tea, to form a substantially tubular body;
Figure 2 shows the operation by which the tubular body is cut and folded to form a bag containing the infusion product; Figure 3 shows a second sealing head for sealing the bag formed in the Figure 2 step.
BEST MODE FOR CARRYING OUT THE INVENTION
Figure 1, as stated, shows a first sealing head 10 forming part of a system for producing bags containing infusion substances; which system is not described in detail herein, by not being essential to a clear understanding of the present invention. A strip 11 of porous paper material is fed by feed and unwinding means (not shown) in the direction of arrow FI towards sealing head 10; and dispensing means (not shown) intermittently deposit quantities ql, q2, q3 , q4 of infusion product with a predetermined spacing. Folding means (not shown) fold strip 11 in the direction of arrows F2 to form a substantially tubular body 12, which continues traveling towards head 10.
A yarn 13 of heat-seal material, e.g. polyethylene or polypropylene, is unwound off a reel 14 by known means not shown, and, by means of a guide member 15, is . run parallel to body 12 in its feed direction, i.e. the direction of arrow FI . A similar elongated element, e.g. in the form of a ribbon, may be used in place of yarn 13.
• The elongated element may be made of polyethylene, polypropylene, material of vegetable origin, or a mixture of these.
Yarn 13 is inserted in known manner between the free portions of strip 11 when folding strip 11 in the direction of arrows F2 to form body 12. Together, the longitudinal portions of strip 11 and yarn 13 form a bead 16 for sealing by head 10.
Head 10 comprises a sealing device 17; and a countermember 18 located on the opposite side of bead 16 to device 17. In other words, as it is fed in the direction of arrow FI, bead 16 passes between device 17 and countermember 18.
By known means not shown, countermember 18 is moved towards device 17 in the direction of arrow F3 , perpendicular to the feed direction of body 12.
Device 17 may be either a heat-producing or ultrasonic wave-producing device.
Both heat and ultrasonic waves, whichever is used, at least partly melt yarn 13, which, as stated, forms part of bead 16; and the molten thermoplastic material penetrates the pores of the sheet of paper material defining strip 11, so as to seal one portion perfectly to the other. Figure 2 shows how body 12 is cut to retain quantities ql, q2 (or q3 , q4) of the infusion product inside the cut portion 19.
As shown in Figure 2, the cut portion 19 is folded in the direction of arrows F4 to form a bag 20 containing quantities ql, q2 of the infusion product, and having four portions 11, 12, 13, 14, which are sealed as shown in Figure 3.
More specifically, as shown in Figure 3, the bottom f of bag 20 is folded, by means not shown, to form two pockets 20a, 20b containing quantities ql, q2 of infusion product respectively.
As bag 20 is fed in the direction of arrow FI, systems identical' with those in Figure 1 insert yarn 13 of heat-seal material inside portions 11, 12, 13, 14 to form a bead 21 for sealing by a sealing head 30.
Sealing head 30 comprises a heat-producing or ultrasonic wave-producing device 31; and a countermember 32, which is moved, by means not shown, in the direction of arrow F2, i.e. perpendicular to the feed direction of bag 20.
It should be stressed that, by virtue of the porosity of the material of which strip 11 is. made, the molten material resulting from melting yarn 13 ensures portions 11, 12, 13, 14 are sealed, even if yarn 13 is not inserted between portions 11, 12 on one side and 13, 14 on the other. That is, portions 11, 12, 13, 14 are sealed even if yarn 13 is simply rested on portion 11 or 14, or is inserted between portions 11 and 12 or 13 and 14.
The advantages of the device according to the present invention are as follows :
• - use of strips of paper substantially comprising cellulose, to preserve the original flavour of the infusion product; and
- perfect sealing of the bag, while at the same time eliminating the use of staples, which could work loose and be accidentally swallowed by the consumer in the infusion.

Claims

1) A method of sealing at least two portions of two flat bodies; the method being characterized by comprising the steps of :
(a) superimposing the at least two portions;
(b) placing an elongated element of thermoplastic material in contact with at least one of said at least two portions; (c) at least partly melting at least one portion of said elongated element to seal said at least two portions as required.
2) A method as claimed in Claim 1, wherein the elongated element is at least partly melted by transferring heat to said elongated element.
3) A method as claimed in Claim 1, wherein the elongated element is at least partly melted by transferring ultrasonic waves to said elongated element.
4) A method as claimed in any one of the foregoing Claims, wherein said elongated element is placed between two of said at least two portions.
5) A method as claimed in any one of Claims 1 to 3, wherein said elongated element is rested on an outer part of one portion. 6) A method as claimed in any one of the foregoing
Claims, wherein said elongated element is in the form of a yarn.
7) A method as claimed in any one of Claims 1 to 5, wherein said elongated element is in the form of a ribbon.
8) A method as claimed in any one of the foregoing Claims, wherein said elongated element substantially comprises polyethylene.
9) A method as claimed in any one of Claims 1 to 7, wherein said elongated element substantially comprises polypropylene .
10) A method as claimed in any one of Claims 1 to 7, wherein said elongated element substantially comprises a material of vegetable origin.
11) A head for use in a system for producing bags for infusion; the head being characterized by comprising means for feeding a strip of paper, and for feeding a heat-sealing elongated element; and heat-producing means.
12) A head as claimed in Claim 11, and also comprising a countermember; said strip of paper, once folded, and said heat-sealing elongated element being fed between said heat-producing means and said countermember. 13) A head as claimed in Claim 12, wherein at least two portions of said strip of paper are sealed by moving said countermember in a direction perpendicular to the feed direction of said strip of paper.
14) A head for use in a system for producing bags for infusion; the head being characterized by comprising means for feeding a strip of paper, and for feeding a heat-sealing elongated element; and ultrasonic wave- producing means. 15) A head as claimed in Claim 14, and also comprising a countermember; said strip of paper, once folded, and said heat-sealing elongated element being fed between said ultrasonic wave-producing means and said countermember.
16) A head as claimed in Claim 15, wherein at least two portions of said strip of paper are sealed by moving said countermember in a direction perpendicular to the feed direction of said strip of paper.- 17) A bag for infusion, characterized by being defined, at least partly, by a folded strip of paper material, and by having at least two portions resting one on the other and sealed to each other by means of an at least partly melted elongated element . 18) A system for producing bags fo infusion, the system being characterized by comprising at least one head as claimed in any one of Claims 11 to 13.
19) A system for producing bags for infusion, the system being characterized by comprising at least one head as claimed in any one of Claims 14 to 16.
PCT/IT2001/000576 2000-11-17 2001-11-16 Method of sealing at least two portions of two flat bodies Ceased WO2002040263A1 (en)

Priority Applications (1)

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AU2002222523A AU2002222523A1 (en) 2000-11-17 2001-11-16 Method of sealing at least two portions of two flat bodies

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000BO000664A ITBO20000664A1 (en) 2000-11-17 2000-11-17 PROCEDURE FOR SEALING AT LEAST TWO FLAPS OF TWO FLAT BODIES
ITBO2000A000664 2000-11-17

Publications (1)

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IT (1) ITBO20000664A1 (en)
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Cited By (5)

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Publication number Priority date Publication date Assignee Title
US7404789B2 (en) * 2002-12-18 2008-07-29 I.M.A. Industria Macchine Automatiche S.P.A. Machine and method for making filter bags for infusion products
US20090263546A1 (en) * 2006-07-31 2009-10-22 Ima Flavour S.R.L. Single-lobe filter bag for infusion products
WO2013117204A1 (en) * 2012-02-10 2013-08-15 Teepack Spezialmaschinen Gmbh & Co. Kg A method for making pouches and a pouch as such
DE102014115977A1 (en) * 2014-11-03 2016-05-04 Melitta Europa Gmbh & Co. Kg Method for producing a bag-shaped filter and filter bag
EP4481112A1 (en) * 2023-06-20 2024-12-25 Billerud Aktiebolag (publ) Ultrasonic sealing of paper or paperboard

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JPS6427928A (en) * 1987-07-24 1989-01-30 Terumo Corp Ultrasonic fusion welding of sheet material
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US5114509A (en) * 1985-05-21 1992-05-19 Battelle Memorial Institute Starch adhesive bonding
JPS6427928A (en) * 1987-07-24 1989-01-30 Terumo Corp Ultrasonic fusion welding of sheet material
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7404789B2 (en) * 2002-12-18 2008-07-29 I.M.A. Industria Macchine Automatiche S.P.A. Machine and method for making filter bags for infusion products
US20090263546A1 (en) * 2006-07-31 2009-10-22 Ima Flavour S.R.L. Single-lobe filter bag for infusion products
EP2522597A1 (en) * 2006-07-31 2012-11-14 Ima Industries S.R.L. Single-lobe filter bag for infusion products.
WO2013117204A1 (en) * 2012-02-10 2013-08-15 Teepack Spezialmaschinen Gmbh & Co. Kg A method for making pouches and a pouch as such
EP2626318B1 (en) * 2012-02-10 2015-01-21 Teepack Spezialmaschinen Gmbh & Co. Kg Infusion bag
CN104334455A (en) * 2012-02-10 2015-02-04 德国蒂派克(Teepack）包装设备有限公司 A method for making pouches and a pouch as such
JP2015506882A (en) * 2012-02-10 2015-03-05 ティーパック スペツィアールマシーネン ゲーエムベーハー ウント カンパニー カーゲーＴｅｅｐａｃｋ Ｓｐｅｚｉａｌｍａｓｃｈｉｎｅｎ Ｇｍｂｈ ＆ Ｃｏ． Ｋｇ Method for forming bag body and bag body
JP2017159960A (en) * 2012-02-10 2017-09-14 ティーパック スペツィアールマシーネン ゲーエムベーハー ウント カンパニー カーゲーＴｅｅｐａｃｋ Ｓｐｅｚｉａｌｍａｓｃｈｉｎｅｎ Ｇｍｂｈ ＆ Ｃｏ． Ｋｇ Method for forming bag body and bag body
US9932136B2 (en) 2012-02-10 2018-04-03 Teepack Spezialmaschinen Gmbh & Co. Kg Method for making pouches and a pouch as such
DE102014115977A1 (en) * 2014-11-03 2016-05-04 Melitta Europa Gmbh & Co. Kg Method for producing a bag-shaped filter and filter bag
EP4481112A1 (en) * 2023-06-20 2024-12-25 Billerud Aktiebolag (publ) Ultrasonic sealing of paper or paperboard
WO2024260983A1 (en) * 2023-06-20 2024-12-26 Billerud Aktiebolag (Publ) Ultrasonic sealing of paper

Also Published As

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ITBO20000664A1 (en) 2002-05-17
AU2002222523A1 (en) 2002-05-27
ITBO20000664A0 (en) 2000-11-17

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