CA2829265A1 - Open bag or bag closed on two sides having an end region closed by means of a material strip, method and apparatus for closing a bag - Google Patents

Open bag or bag closed on two sides having an end region closed by means of a material strip, method and apparatus for closing a bag Download PDF

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Publication number
CA2829265A1
CA2829265A1 CA2829265A CA2829265A CA2829265A1 CA 2829265 A1 CA2829265 A1 CA 2829265A1 CA 2829265 A CA2829265 A CA 2829265A CA 2829265 A CA2829265 A CA 2829265A CA 2829265 A1 CA2829265 A1 CA 2829265A1
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CA
Canada
Prior art keywords
base body
starting material
material strip
end region
open
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.)
Granted
Application number
CA2829265A
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French (fr)
Other versions
CA2829265C (en
Inventor
Josef LORGER
Gerold REPNEGG
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.)
Statec Binder GmbH
Original Assignee
Statec Binder GmbH
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Filing date
Publication date
Application filed by Statec Binder GmbH filed Critical Statec Binder GmbH
Publication of CA2829265A1 publication Critical patent/CA2829265A1/en
Application granted granted Critical
Publication of CA2829265C publication Critical patent/CA2829265C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/1691—End- or aperture-closing arrangements or devices using adhesive applied to attached closure elements
    • 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
    • B29C65/5042—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 covering both elements 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
    • B29C66/40—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
    • B29C66/70—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
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • 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
    • B29C66/851—Bag or container making machines
    • B29C66/8511—Bag making 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
    • B65B51/04—Applying separate sealing or securing members, e.g. clips
    • B65B51/046—Applying a closure element to the mouths of bags
    • 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
    • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/005—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for removing material by cutting
    • 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
    • B65B7/02—Closing containers or receptacles deformed by, or taking-up shape, of, contents, e.g. bags, sacks
    • 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
    • B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
    • B29C65/103—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined direct heating both 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
    • B29C65/5064—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 of particular form, e.g. being C-shaped, T-shaped
    • B29C65/5071—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 of particular form, e.g. being C-shaped, T-shaped and being composed by one single element
    • 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
    • B29C65/5064—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 of particular form, e.g. being C-shaped, T-shaped
    • B29C65/5085—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 of particular form, e.g. being C-shaped, T-shaped and comprising grooves, e.g. being E-shaped, H-shaped
    • 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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7234—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
    • 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
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
    • 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
    • B31B70/004—Closing 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
    • B31B70/61—Uniting opposed surfaces or edges; Taping by applying or securing strips or tape
    • 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
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/812—Applying patches, strips or strings on sheets or webs
    • B31B70/8123—Applying strips
    • 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
    • B65B51/16—Applying or generating heat or pressure or combinations thereof by rotary 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
    • 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
    • B65B51/20—Applying or generating heat or pressure or combinations thereof by fluid pressure acting directly on folds or on opposed surfaces, e.g. using hot-air jets
    • 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
    • B65B55/00—Preserving, protecting or purifying packages or package contents in association with packaging
    • B65B55/24—Cleaning of, or removing dust from, containers, wrappers, or packaging ; Preventing of fouling

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Making Paper Articles (AREA)
  • Bag Frames (AREA)

Abstract

Open-mouth bag (4) made of coated or uncoated polyolefin woven fabric, in particular polypropylene or HDPE (high density polyethylene) woven fabric, which forms a substantially tubular main body (23), having a closed first end region (24) and an open second end region (26), or bag (25) closed at two ends, produced from a coated or uncoated, filled open-mouth bag (4) which is closed at one end and is made of polyolefin woven fabric, in particular polypropylene or HDPE woven fabric, having a substantially tubular main body (23). In order to ensure a tight and secure closure and to rule out damage to the main body (23) caused by stitching and possible contamination associated therewith, it is provided that the closed first end region (24) of the open-mouth bag (4) or at least one end region (38) of the bag (25) closed at two ends is formed by a strip-like, coated web of material (14), which has a V-shaped or U-shaped fold in cross section and the legs (27) of which are thermally welded to the tubular main body (23).

Description

OPEN BAG OR BAG CLOSED ON TWO SIDES HAVING AN END REGION CLOSED
BY MEANS OF A MATERIAL STRIP, METHOD AND APPARATUS FOR CLOSING
A BAG
FIELD OF THE INVENTION
The present invention relates to a method for closing on one side a tubular starting material comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric, to produce an open bag.
The invention further relates to a method for closing a filled open bag, closed on one side, comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric, having a substantially tubular base body, to produce a bag closed on two sides.
The present invention additionally relates to an apparatus for closing on one side a tubular starting material comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric, to produce an open bag.
The present invention further relates to an apparatus for closing a filled open bag, closed on one side, comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric, having a substantially tubular base body, to produce a bag closed on two sides.
PRIOR ART
In packaging technology open bags are very popular as a result of the flexible type of filling when it is a question of the packing of free-flowing bulk goods of all kinds (fine-grained, coarse-grained, powder, granules, pellets etc.). In this context open bag generally and without restriction to a special material designates a bag having a substantially tubular base
2 body which is only closed in a first end region and open in a second region. The closure of filled open bags made of coated or uncoated polypropylene fabric, where polypropylene like polyethylene belongs to the polyolefins, is principally accomplished by sewing at the present time. A distinction is made here primarily between a simple straight sewing and sewing with overfolding of the open bag. Furthermore, sealing cords or sealing strips can be used. In the sewing machines used a distinction is principally made between single-needle and double-needle sewing machines. The fundamental operating mode is the same in all systems whereby the filled open bag is fed to the sewing machine via an insertion system which typically operates via chains or belts and a conveyor belt located thereunder and is sewn by the interlinking of at least one thread.
A disadvantage of this type of closure consists in the weakening or damaging of the open bag material by needle piercings. An absolute tightness of the closure can therefore barely be ensured which, for example, in the case of very fine-grained filling material has a particularly disadvantageous effect. There is also the risk that the filling material will be contaminated by sewing threads, sealing cords or sealing strips. Sewing with overfolding of the open bag is additionally economically disadvantageous since an increased expenditure of open bag material is required for this purpose as a result of the required greater open bag lengths. Possible thread breaks additionally cause relatively long production standstills. In addition, sewing installations are generally relatively maintenance-intensive and cause a high noise level.
Alternatively to sewing, there is also the possibility of heat sealing the open bag. In this case, the open end region of the filled open bag is usually pressed between jaws which are provided with heating elements whereby a thermal input is ' '
3 accomplished - through the entire open bag material - which results in the heat sealing.
It is problematical to use this method when the region to be heat-sealed is contaminated by filling material. This is frequently the case with powdery filling material with the result that a secure, tight closure is thwarted. Primarily however the polypropylene bag fabric is weakened or damaged by the type of heat sealing described, as is necessarily the case according to the method disclosed in GB 937011 A. In this case plastic bags are sealed by pulling heat-sealable tape over the open end of the bag and pressing against the open end, whereupon the heat sealing then takes place in a heat sealing machine, where the tape is exposed to thermal energy from outside from opposite sides. Quite similarly according to US
4278488 A, the lower side edge of a tubular starting material was closed with a thermoplastic tape, where in this case also the thermal energy was input from outside through the entire material.
The methods described above are also used in the manufacture of open bags, with the associated advantages, where a substantially tubular starting material is closed in an end region.
In this context mention should be made of AT 400831 B which discloses a method for manufacturing a bag having a box-shaped or rectangular end, in which a flat cover sheet is heat-sealed onto a folded, flat base surface of a bag comprising a fabric coated at least on one side of monoaxially stretched polymer tapes. Here the cover sheet also consists of a coated tape fabric. The hot air brings about a heating of the mutually facing coatings as far as plasticizing. The flat cover sheet and the flat bag bottom surface are then drawn through a cooled pair of rollers, whereby the heated coatings are pressed together.
4 OBJECT OF THE INVENTION
It is therefore the object of the present invention to ensure a one-sided closure of a tubular starting material comprising coated or uncoated polyolefin fabric to produce an open bag and a closure for open bags made of coated or uncoated polyolefin fabric, without the aforesaid disadvantages occurring, in particular without the starting material or open bag material being damaged or weakened.
DESCRIPTION OF THE INVENTION
According to the invention, this is achieved whereby a tubular starting material made of coated or uncoated polyolefin fabric, in particular of polypropylene or HDPE ("high density polyethylene", i.e. polyethylene having a high density), or a filled open bag made of coated or uncoated polyolefin fabric, in particular of polypropylene or HDPE fabric, is thermally heat-sealed at an open end to a coated material strip. A tight closure is thereby achieved and possible contamination by thread material, sealing cords or sealing strips is thereby avoided. It is also economically advantageous that a saving of open bag or bag material is achieved compared with the closure by sewing with folding over of the open end region.
In order to achieve an optimal thermal heat sealing, a thermally activatable sealing layer is advantageous. This can be provided, for example, by a coating of the material tape, where the coating can be provided on the most diverse support materials.
Thus, in an open bag made of coated or uncoated polyolefin fabric forming a substantially tubular base body, in particular polypropylene or HDPE ("high density polyethylene") fabric, having a closed first end region and an open second end region =
=

or in a bag closed on two sides, made from a coated or uncoated, filled open bag closed on one side, made from polyolefin fabric, in particular polypropylene or HDPE fabric, comprising a substantially tubular base body, it is provided
5 that the closed first end region of the open bag or at least one end region of the bag closed on two sides is formed by a strip-shaped coated material strip, which is folded in a V or U
shape in cross-section and whose leg is thermally heat-sealed to the tubular base body, where the strip-shaped coated material tape consists of a support material, preferably of polyolefin fabric, in particular polypropylene or HDPE fabric, paper or card and is executed with a coating at least on its side facing the tubular base body.
Thermoplastic materials such as polyolefins are suitable as sealing layer for the thermal heat-sealing. These are easy to process and chemically resistant. Polyethylene is such a plastic. According to a further embodiment it is therefore provided that on the side of the material strip facing the tubular base body, the coating of the support material consists of polyethylene.
According to the invention, a closure method is used which avoids damage to or weakening of the polypropylene or HDPE
fabric whereby the energy required for the thermal heat sealing is applied between the layers to be welded and therefore directly to the surfaces to be welded. Specifically in a method for the one-sided closure of a tubular starting material made of coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric to produce an open bag it is provided that a strip-shaped coated or uncoated material strip is folded in a V or U shape in cross-section and drawn over an open first end region of the tubular starting material, where in particular the side of the material strip facing the starting material can be provided with a coating and as a result of the drawing over, an overlap region is formed in '
6 which the V- or U-shaped material strip receives the first end region of the tubular starting material between itself and thermal energy, preferably in the form of a hot gas, particularly preferably in the form of hot air, is introduced, preferably blown, directly into the overlap region, onto the side of the material strip facing the starting material and/or onto the surface of the starting material facing this side of the material strip, and then material strip as well as starting material is pressed together in the overlap region.
Similarly in a method for closing a filled open bag closed on one side made of coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric having a substantially tubular base body to produce a bag closed on two sides, it is provided that a strip-shaped coated or uncoated material strip is folded in a V or U shape in cross-section and drawn over an open first end region of the tubular base body, where in particular the side of the material strip facing the starting material can be provided with a coating and as a result of the drawing over, an overlap region is formed in which the V- or U-shaped material strip receives the first end region of the tubular starting material between itself and thermal energy, preferably in the form of a hot gas, particularly preferably in the form of hot air, is introduced, preferably blown, directly into the overlap region, onto the side of the material strip facing the starting material and/or onto the surface of the starting material facing this side of the material strip, and then material strip as well as base body are pressed together in the overlap region. Since the strip-shaped material strip is only folded before drawing over, among other things, the handling of the material strip is substantially simplified since it can be unrolled conveniently as a strip from a roll.
According to one embodiment, the thermal energy is introduced substantially at the same time as the drawing of the material
7 strip over an open first end region of the tubular starting material or base body.
According to a further embodiment, it is provided that the starting material or the base body are continuously moved further during the closing and the material strip is drawn over the open first end region of the starting material or base body at controllable, preferably synchronous speed in relation to the starting material or base body.
According to a further embodiment, the starting material or the base body is trimmed to a defined length before drawing the material strip over the first end region thereof, wherein preferably the accumulating section strips are conveyed into a collecting container.
According to a further embodiment, it is provided that after the trimming but before introducing the thermal energy the starting material or the base body is cleaned by means of compressed air in the open first end region. In this way, it should be ensured that the heat sealing of the surfaces to be heat-sealed is not adversely affected by impurities such as, for example, bulk material, in particular powdery bulk material or by the residue of starting material or base body material caused by the trimming.
In order to carry out the sealing and material-protecting heat-sealing method according to the invention, an apparatus is proposed which is characterised by low maintenance and a lower noise level compared with known sewing systems. For the closure process according to the invention, in an apparatus for closing on one side a tubular starting material comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE
fabric, to produce an open bag, it is provided that the apparatus comprises a material strip unrolling system for a strip-shaped, material strip and comprises means for folding in a V or U shape in cross-section and drawing the material strip
8 over an open first end region of the starting material and means for introducing thermal energy directly into an overlap region in which the V- or U-shaped material strip receives the first end region of the tubular starting material between itself, onto the side of the material strip facing the starting material and/or onto the surface of the starting material facing this side of the material strip, as well as pressing means for pressing the material strip onto the starting material surface.
Similarly in an apparatus for closing a filled open bag closed on one side comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric, comprising a substantially tubular base body to produce a bag closed on two sides, it is provided that the apparatus comprises a material strip unrolling system for a strip-shaped, material strip, means for folding in a V or U shape in cross-section and drawing the material strip over an open first end region of the base body and means for introducing thermal energy directly into an overlap region in which the V- or U-shaped material strip receives the first end region of the tubular base body between itself, onto the side of the material strip facing the base body and/or onto the surface of the base body facing this side of the material strip, as well as pressing means for pressing the material strip onto the base body surface.
The above apparatus is intended to ensure a continuous closure of tubular starting material or of filled open bags closed on one side. This is achieved by conveying the starting materials or the open bags continuously through the apparatus. According to one embodiment it is therefore provided that the apparatus comprises conveying means for conveying the starting material or base body at constant speed and the material strip unrolling system can be controlled synchronously to this speed, wherein the conveying means preferably include a belt system which fixes the starting material or the base body on the open first
9 end region and leads to the means for folding and drawing over the material strip and away from these.
According to a further embodiment, the conveying means further comprises a conveyor belt system by means of which the preferably horizontal starting material or the preferably vertical base body is conveyed.
The continuous movement of the starting materials or the open bags through the apparatus means that the material strip must be applied to moving starting materials or open bags which necessitates special measures. Therefore a further embodiment provides that the means for folding and drawing over the material strip over the first end region of the starting material or base body comprises a forming shoulder which has a gap through which the open first end region can be guided in a conveying direction. The forming shoulder enables the folding and drawing over of the material strip.
The fact that the starting material or the open bag is moved continuously through the apparatus and therefore also through the forming shoulder requires that the thermal energy should be introduced specifically and at the correct time. Therefore thermal energy is only introduced into an overlap region when this is actually present, i.e. when the V- or U-shaped material strip actually receives the first end region of the starting material or the base body between itself. According to a further embodiment, the means for introducing thermal energy therefore comprise at least one movably disposed air nozzle which can be moved from a rest position into a working position, wherein the at least one air nozzle is disposed in the working position such that substantially parallel to the conveying direction of the starting material or base body, hot gases, preferably hot air, can be blown into the overlap region, onto the side of the material strip facing the starting material and/or onto the surface of the starting material facing this side of the material strip.
According to a further embodiment it is provided that the movement of the at least one air nozzle from the rest position 5 into the working position is accomplished by a pivoting in a vertical plane which lies parallel to the conveying direction of the starting material or base body.
For the heat sealing, in addition to the heating, it is necessary to produce an intimate connection of the surfaces to
10 be welded by pressing these onto one another. Therefore in a further embodiment the pressing means comprise pressing rollers applied directly following the forming shoulder.
A further embodiment provides that the pressing rollers are frictionally connected to the material strip and pull the material strip away from the material strip unrolling system.
In order to ensure a successful welding, it is necessary that the first end region of the tubular starting material or base body is actually located inside the gap of the forming shoulder and does not project over the forming shoulder when the material strip is drawn over the first end region. It is therefore provided according to a further embodiment that the apparatus comprises a trimming device in order to trim the starting material or the base body to a defined, selectable length at the first end region over which the material strip is drawn.
Finally it is provided in a further embodiment that the apparatus comprises a chopping unit in order to cut the material strip in the conveying direction before and after the first end region of the starting material or base body which is drawn over with the material strip. The starting material or the base body can then be conveyed subsequently from the apparatus - without residue of the material strip projecting in
11 or contrary to the conveying direction in the closed first end region.
BRIEF DESCRIPTION OF THE FIGURES
The invention is now explained in more detail with reference to an exemplary embodiment for the closure of a filled open bag closed on one side comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric, comprising a substantially tubular base body to produce a bag closed on two sides. The drawings are exemplary and are intended to present the inventive idea but in no way restrict or even definitively reproduce it.
In the figures:
Fig. 1 shows a schematic diagram of the frontal cross-section and side view of an open bag according to the invention which has an end region closed with a strip-shaped material strip folded into a V shape Fig. 2 shows a schematic diagram of the frontal cross-section and side view of bag closed on two sides whose end regions according to the invention are closed with a strip-shaped material strip folded into a U shape Fig. 3 shows a schematic front cross-sectional view of an end region closed according to the invention of an uncoated and a coated bag or open bag Fig. 4 shows an axonometric view of an apparatus for closing open bags according to the invention comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric, where an open bag is located in the apparatus and the closure process is approximately half completed
12 Fig. 5 shows an enlarged view of Fig. 4 but without support structure and conveyor belt Fig. 6 shows an axonometric detailed view of the region A from Fig. 5 Fig. 7 shows an axonometric view of the forming shoulder Fig. 8 shows an axonometric view of the forming shoulder with material strip drawn thereover Fig. 9 shows a front view of the forming shoulder with material strip drawn thereover and inserted end region of the open bag Fig. 10 shows a section through the forming shoulder along the gap, where the material strip is pulled over and an open end region of the open bag is inserted and the air nozzles are in the working position Fig. 11 shows a further axonometric view of the apparatus without support structure and conveyor belt, where the closure process is completed and the bag now closed on two sides is located in the apparatus.
WAYS FOR IMPLEMENTING THE INVENTION
Figure 1, left, shows a schematic diagram, not to scale, of the frontal cross-sectional view of an end region of an open bag 4 closed according to the invention with a strip-shaped material strip 14 folded into a V shape, having a surface 34. Here the legs 27 of the material strip 14 are thermally heat-sealed to the tubular base body 23 of the open bag 4. Figure 1, right, shows a schematic side view, not to scale, where a closed first end region 24 and an open second end region 26 are indicated.
Compared to this, Figure 2, left, shows the schematic frontal cross-sectional view, not to scale, of a bag 25 closed on two sides 25, having a surface 34, where both end regions according
13 to the invention are closed with a strip-shaped material strip
14 folded in a U shape. Here the legs 27 of the material strip 14 are thermally heat-sealed to the tubular base body 23 of the bag 25. The schematic side view, not to scale, shown on the right in Fig. 2 again shows the two closed end regions 38, 39 of the bag 25 closed on two sides.
Figure 3, left shows in detail a schematic frontal cross-sectional view, not to scale, of a first end region 24, 38, closed according to the invention, of an uncoated tubular base body 23. In particular, the support material 28 of the material strip 14 folded in a U shape and a coating 29 on the side facing the base body 23 can be identified. Figure 3, right, shows the situation for a tubular base body 23 coated on the surface 34 and a V-shaped folded material strip 14.
The invention is explained in the following with reference to the closure process of a filled open bag 4 according to the invention to produce a bag 25 closed on two sides, where the already-closed second end region 39 is also closed according to the invention or with another, known method, e.g. by sewing.
Figure 4 shows an axonometric view of an apparatus for closing open bags according to the invention, comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE
fabric. A filled open bag 4 is conveyed further by a conveyor belt system in a conveying direction 20 vertically and with the open side pointing upwards continuously through the closure apparatus, whose components are held by a support system 1. The conveyor belt system consists of a conveyor belt 15, a conveyor belt motor 18 and a height-adjustable guardrail 22. The conveyor belt 15 is driven by an electric motor which can be controlled via a frequency inverter. The height-adjustable guardrail 22 prevents the filled open bag 4 from falling over and provides coarse guidance of the open bag 4.

The open first end region 38 is additionally fixed by means of an electrically driven belt system 2 and guided to those components of the apparatus where the actual closure process takes place or where the open first end region 38 is prepared for the closure, see Fig. 5. Furthermore, the belt system 2 guides the open first end region 38 away from these components again. The belt system 2 is driven by means of its own motor 17 and can also be controlled by means of frequency inverters. At the same time, the belt speed is synchronously adapted to the speed of the conveyor belt 15. The typical working range of the belt speed which is at the same time the throughput speed of the open bag 4 lies between 8 and 20 m/min.
The open bag 4 is initially guided through a continuously running trimming device 3 where it is trimmed by means of two knife blades to a defined selectable height. The accumulating section strips are transported, for example, by means of compressed air nozzles and baffles integrated in the trimming device 3 or vacuum suction into a collecting container provided for this purpose. Optionally the open first end region 38 to be heat-sealed or sealed subsequently is then cleaned by means of nozzles (not shown).
After exit from the trimming device, the actual closure process begins, this being started by means of a sensor 10 for detection of open bags, see Fig. 6. In this case, a coated or uncoated material strip 14 is used, which can also be designated as rider cord. In the exemplary embodiment described, a coated material tape 14 is assumed as an example in the following, whose support material 28 can be constructed of polypropylene fabric, card or paper, in particular Kraft paper. Here a tear-proof paper whose cellulose fibres are obtained by the so-called Kraft process is designated as Kraft paper.

' The material strip 14 is placed or drawn over the cut edge 36 of the first end region 38. To this end, the material tape 14, which is drawn off from a material strip unrolling system 7 is guided via a forming shoulder 8 downwards in the direction of 5 the open bag 4 so that the material strip 14 surrounds the open first end region 38 of both sides extending substantially parallel to the conveying direction 20 of the open bag 4 and a coated side of the material strip 14 points in the direction of the open bag surface 34, see Fig. 5 and Fig. 6. Here the 10 coating 29 of the material strip 14 on the side pointing in the direction of the open bag surface 34 is formed from a material which is suitable for thermal heat sealing with the open bag surface, such as for example polyethylene. The material strip 14 can be uncoated on its other outer side, i.e. the outer side
15 of the material strip 14 is formed by the support material 28, as shown in Fig. 3. Alternatively to this, the material strip 14 can have the same coating 29 on the outside as the side facing the open bag surface 34. However, it is also feasible that the material strip 14 has a different coating on its outer side, in order for example to meet visual or other demands.
Figure 7 shows the forming shoulder 8 in detail in an axonometric view obliquely from below. The forming shoulder consists of two parts which are mirror-symmetrical with respect to a plane spanned by the conveying direction 20 of the open bag 4 and the direction in which the open side of the open bag 4 is pointing (i.e. vertically upwards). The two parts form a gap 31 by means of which the material strip 14 is folded and through which the open first end region 38 is conveyed.
On this matter Fig. 8 also shows the forming shoulder 8 in detail but with material strip 14 drawn thereover. The surfaces flanking the inlet opening for the open bag 4 are convex and designed to slope from top to bottom in the conveying direction 20. This on the one hand enables nestling of the material strip 14 against the forming shoulder 8 and on the other hand a
16 problem-free introduction of the open bag 4 into the forming shoulder 8 so that the material strip 14 is placed or drawn over the cut edge 36 of the first end region 38.
An overlap region 30 is thus formed in which the material strip 14 receives the open first end region 38 in a V or U shape between itself. This overlap region 30 can be clearly seen in Fig. 9 in a frontal view (when viewed in the conveying direction 20) of the forming shoulder 8 with folded and drawn over material strip 14 and inserted open bag 4.
At the same time as the drawing of the material strip 14 over the forming shoulder 8, air nozzles 6 are pivoted by means of a hydraulic stamp 16 from a rest position 32 (compare Fig. 11) into a working position 33 (see in particular Fig. 10). In this position, the air nozzles 6 are disposed such that they have a defined selectable distance of typically 2 to 8 mm from the forming shoulder 8. In the illustrated exemplary embodiment, a total of two air nozzles 6 are provided, where respectively one air nozzle is located on each side extending substantially parallel to the conveying direction 20 of the open bag 4. The outlet openings 37 of the air nozzles 6 point slightly towards one another and in the pivoted state in the conveying direction 20 of the open bag 4, see Fig. 6 or Fig. 10. The outlet openings 37 are each located at the end of a substantially rectangular knee, which adjoins respectively one perpendicular pipe in the working position 33, through which hot air is supplied. The outlet openings 37 of the air nozzles 6 are also bevelled, similarly to the contour of the forming shoulder 8, see Fig. 6, Fig. 10 and Fig. 11, which favours the pivoting.
Hot compressed air or other suitable hot gases are blown in via the air nozzles 6 into the overlap region 30 in which the material strip 14 receives the open first end region 18 in a V
or U shape between itself. By this means thermal energy is therefore applied without transfer through the support material
17 28 of the material strip 14 or through the open bag 4 between and therefore onto to the surfaces 29, 34 to be joined so that these start to melt. Depending on whether the surfaces to be joined are coated or uncoated, the respective coating or the material of the base body or the support material begins to melt. The compressed air or suitable gases are heated by means of a controllable air heater 5. The energy input can in this case be specifically varied by means of the gas temperature and/or the pressure - and therefore by means of the blown-in amount of gas.
The molten surfaces 29, 34 of the open bag 4 and the material strip 14 are then pressed onto one another by pressing rollers 9 applied directly after the forming shoulder 8 whereby the sealing or heat-sealing process is ended. That is, the legs of the material strip 14 are now thermally heat-sealed to the base body of the open bag 4.
The pressing rollers 9 are frictionally connected to the material strip 14 and function at the same time as drawing of the material strip 14 from the material strip unrolling system 7. The pressing rollers 9 are driven by means of an electric motor 19 which can be controlled by means of frequency inverters, see Fig. 5 and run at synchronous speed to the belt system 2.
After the pressing rollers 9, another sensor 12 is attached which starts the chopping unit 11 comprising two blades, which is placed thereafter, see Fig. 6. The chopping unit 11 initially cuts the material strip when viewed in the conveying direction 20 before the already-closed first end region 38, see Fig. 6. This minimizes or avoids protrusion of the material strip 14 beyond the closed cutting edge 36 or the first end region 38 in the conveying direction. After the belt system 2 has conveyed the open bag 4 through the chopping unit 11, the material strip 14 is cut after the closed first end region 38
18 when viewed in the conveying direction 20, see Fig. 11. Thus, the bag 25 now closed on two sides can be conveyed unhindered from the closure machine. The accumulating section strips are transported for example by means of compressed air nozzles and baffles or vacuum extraction into a collecting container provided for this purpose.
Furthermore, the withdrawal of material strip with the pressing rollers 9 is stopped by means of the sensor 12 and the pivoting process of the air nozzle 6 from the working position 33 (compare Fig. 6) into the rest position 32 (compare Fig. 11) is started. Figure 11 shows that in the exemplary embodiment the air nozzles 6 pivot vertically upwards so that the pivoting process takes place in a vertical plane, which lies parallel to the conveying direction 20 of the open bag 4.
Depending on the chemical composition and the thermal material properties of the open bag 4 or the surface thereof 34 and the material strip 14 or its coating 29, the speed of the belt system 2, the temperature and the pressure or the amount of blown-in hot gases and the exact position of the air nozzles 6 in the pivoted state with respect to the forming shoulder 8 are crucial for the closure process. In addition, external influences such as ambient temperature, air humidity and impurities, particularly dust can affect the heat-sealing process. The closure process can be controlled and adapted in this respect by means of control elements which are mounted in the switchgear cabinet 13 shown in Fig. 4.
The closure of a substantially tubular starting material comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric is accomplished in exactly the same way as for the production of an open bag 4 and is not shown additionally. In this case, instead of the filled open bag 4 a tubular starting material comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric =
19 appears in the exemplary embodiment shown, of which an open first end region 24 is closed with the material strip 14 according to the invention. In this case, it can possibly be favourable to convey the starting material horizontally. In this case, the spatial arrangement of the apparatus must be adapted. In particular, the positioning of the trimming device 3, the air nozzles 8 in the working position 33, the forming shoulder 8, the pressing rollers 9 and the chopping unit 11 must be selected so that the horizontally conveyed starting material is trimmed at an open first end region 24, inserted into the forming shoulder 8, drawn over with the material strip 14 and heat-sealed and conveyed out from the apparatus again.
In another embodiment also not shown extra, the material strip 14 can be additionally sewn, in order to meet particular stresses.
With the invention presented, it is also feasible to close an already-closed end region 24 of an open bag 4 or a bag 25 closed on two sides comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric with a coated or uncoated material strip 14 according to the invention a second time. That is, in this case the material strip 14 would be drawn over a closed first end region 24, 38 and thermally heat-sealed with this. For example, an already-sewn end region could be reliably sealed or a first end region 24, 38 already closed according to the invention could be additionally reinforced.
It is understood that during the manufacture of open bags 4 comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric, the one-sided closure according to the invention can also be applied when the tubular starting material additionally comprises material for an inner bag.
Likewise filled open bags 4 comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric, ' can be closed according to the invention to produce bags closed on two sides 25 according to the invention if the substantially tubular base body 23 comprises an inner bag.

REFERENCE LIST
1 Support structure 2 Belt system for guiding and fixing the open bag 3 Trimming device 4 Filled open bag comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric 5 Air heater 6 Air nozzles 7 Material strip unrolling system 8 Forming shoulder 9 Pressing rollers 10 Sensor 11 Chopping unit 12 Sensor 13 Switchgear cabinet with control elements 14 Material strip 15 Conveyor belt 16 Hydraulic stamp 17 Motor for belt system 18 Motor for conveyor belt 19 Motor for pressing rollers
20 Conveying direction
21 Deflecting roller
22 22 Height-adjustable guide rail
23 Tubular base body
24 First end region of open bag
25 Bag closed on two sides
26 Second end region of open bag
27 Leg of material strip
28 Support material
29 Coating
30 Overlap region
31 Gap
32 Rest position
33 Working position
34 Surface of the open bag or the bag closed on two sides
35 Surfaces of the forming shoulder
36 Cutting edge
37 Outlet openings of the air nozzles
38 First end region of the bag closed on two sides
39 Second end region of the bag closed on two sides

Claims (14)

23
1. Method for closing a tubular starting material on one side to produce an open bag (4) or for closing a filled open bag (4) closed on one side, comprising a tubular base body (23) to produce a bag (25) closed on two sides, wherein a strip-shaped, coated or uncoated material strip (14) is folded in a V or U shape in cross-section and drawn over an open first end region (24, 38) of the tubular starting material or base body (23), wherein in particular the side of the material strip (14) facing the starting material or base body (23) can be provided with a coating (29) and as a result of the drawing over an overlap region (30) is produced in which the V- or U-shaped material strip (14) receives between itself the first end region (24, 38) of the tubular starting material or base body (23), characterized in that the tubular starting material or the base body (23) consists of coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric and that thermal energy, preferably in the form of a hot gas, particularly preferably in the form of hot air is introduced, preferably blown, directly into the overlap region (30) on the side of the material strip (14) facing the starting material or base body (23) and/or onto the surface of the starting material or base body (23) facing this side of the material strip (14), and then material strip (14) and starting material or base body (23) are pressed together in the overlap region (30), wherein the introduction of the thermal energy takes place at the same time as the drawing of the material strip (14) over the open first end region (24, 38) of the tubular starting material or base body (23).
2. The method according to claim 1, characterized in that the starting material or the base body (23) are continuously moved further during the closing and the material strip (14) is drawn over the open first end region (24, 38) of the starting material or base body (23) at controllable, preferably synchronous speed in relation to the starting material or base body (23).
3. The method according to one of claims 1 to 2, characterized in that the starting material or the base body (23) is trimmed to a defined length before drawing the material strip (14) over the first end region (24, 38) thereof, wherein preferably the accumulating section strips are conveyed into a collecting container.
4. The method according to claim 3, characterized in that after the trimming but before introducing the thermal energy the starting material or the base body (23) is cleaned by means of compressed air in the open first end region (24, 38).
5. Apparatus for closing on one side a tubular starting material comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric, to produce an open bag (4) or for closing a filled open bag (4) closed on one side, comprising coated or uncoated polyolefin fabric, in particular polypropylene or HDPE fabric, comprising a tubular base body (23) to produce a bag (25) closed on two sides, wherein the apparatus comprises a material strip unrolling system (7) for a strip-shaped, material strip (14) and comprises means (8) for folding in a V or U shape in cross-section and drawing the material strip (14) over an open first end region (24, 38) of the tubular starting material or base body (23), characterized in that the apparatus comprises means (6) for introducing, at the same time as drawing over the material strip (14), thermal energy directly into an overlap region (30) in which the V- or U-shaped material strip (14) receives the first end region (24, 38) of the tubular starting material or base body (23) between itself, onto the side of the material strip (14) facing the starting material or base body (23) and/or onto the surface of the starting material or base body (23) facing this side of the material strip (14), as well as pressing means (9) for pressing the material strip (14) onto the starting material surface or base body surface.
6. The apparatus according to claim 5, characterized in that the apparatus comprises conveying means (2, 15, 17, 18, 22) for conveying the starting material or base body (23) at constant speed and the material strip unrolling system (7) can be controlled synchronously to this speed, wherein the conveying means (2, 15, 17, 18, 22) preferably include a belt system (2) which fixes the starting material or the base body (23) on the open first end region (24, 38) and leads to the means (8) for folding and drawing over the material strip (14) and away from these.
7. The apparatus according to claim 6, characterized in that the conveying means (2, 15, 17, 18, 22) further comprises a conveyor belt system (15, 18, 22) by means of which the preferably horizontal starting material or the preferably vertical base body (23) is conveyed.
8. The apparatus according to one of claims 5 to 7, characterized in that the means (8) for folding and drawing over the material strip (14) over the first end region (24, 38) of the starting material or base body (23) comprises a forming shoulder (8) which has a gap (31) through which the open first end region (24, 38) can be guided in a conveying direction (20).
9. The apparatus according to claim 8, characterized in that the pressing means (9) comprise pressing rollers (9) applied directly after the forming shoulder (8).
10. The apparatus according to claim 9, characterized in that the pressing rollers (9) are connected frictionally to the material strip (14) and draw the material strip (14) from the material strip unrolling system (7).
11. The apparatus according to any one of claims 5 to 10, characterized in that the means for introducing thermal energy comprise at least one movably disposed air nozzle (6) which can be moved from a rest position (32) into a working position (33), wherein the at least one air nozzle (6) is disposed in the working position (33) such that parallel to the conveying direction (20) of the starting material or base body (23), hot gases, preferably hot air, can be blown into the overlap region (30), onto the side of the material strip (14) facing the starting material or base body (23) and/or onto the surface of the starting material or base body (23) facing this side of the material strip (14).
12. The apparatus according to claim 11, characterized in that the movement of the at least one air nozzle (6) from the rest position (32) into the working position (33) is accomplished by a pivoting in a vertical plane which lies parallel to the conveying direction (20) of the starting material or base body (23).
13. The apparatus according to one of claims 5 to 12, characterized in that this comprises a trimming device (3) in order to trim the starting material or the base body (23) to a defined, selectable length at the first end region (24, 38) over which the material strip (14) is drawn.
14. The apparatus according to one of claims 5 to 13, characterized in that the apparatus comprises a chopping unit (11) in order to cut the material strip (14) in the conveying direction (20) before and after the first end region (24, 38) of the starting material or base body (23) which is drawn over with the material strip (14).
CA2829265A 2011-03-07 2011-08-31 Open bag or bag closed on two sides having an end region closed by means of a material strip, method and apparatus for closing a bag Active CA2829265C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ATGM127/2011 2011-03-07
AT0012711U AT12257U1 (en) 2011-03-07 2011-03-07 OFFENSACK WITH A MEDIUM-BONDED FINISHED END AREA
PCT/EP2011/065045 WO2012119667A1 (en) 2011-03-07 2011-08-31 Open-mouth bag or bag closed at two ends having an end region closed by means of a web of material, process and device for closing a bag

Publications (2)

Publication Number Publication Date
CA2829265A1 true CA2829265A1 (en) 2012-09-13
CA2829265C CA2829265C (en) 2018-10-23

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AT (1) AT12257U1 (en)
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ES2525836T3 (en) 2014-12-30
BR112013022393A2 (en) 2016-12-06
WO2012119667A1 (en) 2012-09-13
CA2829265C (en) 2018-10-23
AT12257U1 (en) 2012-02-15
BR112013022393B1 (en) 2020-06-23
EP2683617A1 (en) 2014-01-15
EP2683617B1 (en) 2014-10-01

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