EP3519312B1 - Ventilsack sowie verfahren und system zur herstellung eines ventilsacks - Google Patents

Ventilsack sowie verfahren und system zur herstellung eines ventilsacks Download PDF

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Publication number
EP3519312B1
EP3519312B1 EP17777023.7A EP17777023A EP3519312B1 EP 3519312 B1 EP3519312 B1 EP 3519312B1 EP 17777023 A EP17777023 A EP 17777023A EP 3519312 B1 EP3519312 B1 EP 3519312B1
Authority
EP
European Patent Office
Prior art keywords
cover strip
strip
wall
valve
bag
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.)
Active
Application number
EP17777023.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3519312A1 (de
Inventor
Andreas Lamkemeyer
Michael Jung
Uwe Köhn
Jakob DERKSEN
Andreas Kleemann
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.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Priority to PL17777023T priority Critical patent/PL3519312T3/pl
Publication of EP3519312A1 publication Critical patent/EP3519312A1/de
Application granted granted Critical
Publication of EP3519312B1 publication Critical patent/EP3519312B1/de
Priority to HRP20202057TT priority patent/HRP20202057T1/hr
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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/14—Valve bags, i.e. with valves for filling
    • B65D31/142—Valve bags, i.e. with valves for filling the filling port being formed by folding a flap connected to a side, e.g. block bottoms
    • 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
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/146—Cutting, e.g. perforating, punching, slitting or trimming using tools mounted on a drum
    • 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
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/262—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement
    • 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
    • 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
    • B31B70/84—Forming or attaching means for filling or dispensing contents, e.g. valves or spouts
    • B31B70/85—Applying patches or flexible valve inserts, e.g. applying film-like valves
    • 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
    • B65B1/00—Packaging fluent solid material, e.g. powders, granular or loose fibrous material, loose masses of small articles, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B1/20—Reducing volume of filled material
    • B65B1/22—Reducing volume of filled material by vibration
    • 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
    • B65B1/00—Packaging fluent solid material, e.g. powders, granular or loose fibrous material, loose masses of small articles, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B1/28—Controlling escape of air or dust from containers or receptacles during filling
    • 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
    • B65B43/00—Forming, feeding, opening or setting-up containers or receptacles in association with packaging
    • B65B43/42—Feeding or positioning bags, boxes, or cartons in the distended, opened, or set-up state; Feeding preformed rigid containers, e.g. tins, capsules, glass tubes, glasses, to the packaging position; Locating containers or receptacles at the filling position; Supporting containers or receptacles during the filling operation
    • B65B43/46—Feeding or positioning bags, boxes, or cartons in the distended, opened, or set-up state; Feeding preformed rigid containers, e.g. tins, capsules, glass tubes, glasses, to the packaging position; Locating containers or receptacles at the filling position; Supporting containers or receptacles during the filling operation using grippers
    • B65B43/465—Feeding or positioning bags, boxes, or cartons in the distended, opened, or set-up state; Feeding preformed rigid containers, e.g. tins, capsules, glass tubes, glasses, to the packaging position; Locating containers or receptacles at the filling position; Supporting containers or receptacles during the filling operation using grippers for 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
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/14—Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
    • B65B51/146—Closing 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
    • 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
    • B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B65B51/30—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
    • B65B51/303—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes reciprocating along only one axis
    • 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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/08—Bags or like containers made of paper and having structural provision for thickness of contents with block bottoms
    • 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
    • B65D33/01—Ventilation or drainage of 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
    • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
    • B31B2150/001—Flexible containers made from sheets or blanks, e.g. from flattened tubes with square or cross bottom
    • 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
    • B31B2160/00—Shape of flexible containers
    • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
    • 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
    • B31B2170/00—Construction of flexible containers
    • B31B2170/20—Construction of flexible containers having multi-layered walls, e.g. laminated or lined
    • 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
    • B65B1/00—Packaging fluent solid material, e.g. powders, granular or loose fibrous material, loose masses of small articles, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B1/04—Methods of, or means for, filling the material into the containers or receptacles
    • B65B1/18—Methods of, or means for, filling the material into the containers or receptacles for filling valve-bags

Definitions

  • the invention relates to a valve sack according to the preamble of claim 1, a method for producing a valve sack according to the preamble of claim 11 and a system for producing a valve sack according to the preamble of claim 16.
  • Valve bags are those bags that are completely finished before filling and are later filled via the valve, so that no subsequent closing of the bag is necessary. Such bags can be filled particularly quickly and efficiently in filling machines. Filling goods are often powdery goods such as building materials, especially cement.
  • the documents DE102013000038A1 and DE4303894A1 disclose valve sacks.
  • the documents DE102010028394A1 and DE10232136A1 reveal more sacks.
  • the filling material is often introduced into the sack, in particular blown into it, while being mixed with air. It is therefore necessary that the bag can be deflated.
  • the present invention relates to such valve bags as described in the opening paragraph, which comprise a first and a second wall which are connected to one another by side edges or gussets. At the ends there are floors, via which the two walls are also connected to one another. The walls delimit the interior of the sack, together with the bottoms and possibly together with the side gussets.
  • valve base The valve is arranged in one of the floors; this base can therefore be referred to as the valve base.
  • the other bottom is completely closed, that is, the inside of the sack cannot be reached from the outside via this floor.
  • This floor can also be referred to as valveless floor. Since the sack is suspended and / or set up vertically, at least during filling, with the valve base at the upper end, the end of the sack which comprises the valve base can simply be referred to as "top” or "upper end”. The second end is therefore "below” or it is the "lower end”.
  • ventilation openings are provided in the first and / or in the second wall.
  • the object of the present invention is therefore to propose a generic sack and a production method for such a sack which, in spite of the great ventilation required, offers improved retention of contents. In addition, improved protection against moisture is desirable.
  • At least one channel to be provided on the outside of at least one wall which covers the ventilation openings and which is formed by at least two parallel fastening strips and a cover strip, the cover strip also comprises ventilation openings and wherein the shortest path between the parallel fastening strips along the cover strip is longer than the shortest path along the at least one wall.
  • a channel that covers the ventilation openings is thus formed by a cover strip which is arranged on the outside of at least one wall, and at least two fastening strips with which the cover strip is fastened to the wall. This means that the air that is brought into the interior of the bag with the filling material can initially escape into the channel.
  • the shortest path between the parallel fastening strips that is to say the path across the fastening strips, along the cover strip is longer than the shortest path along the at least one wall.
  • the covering strip is limp between the fastening strips when the area of the wall between the fastening strips is flat.
  • the channel can form a cavity. It is advantageous that the air can flow into this cavity via the ventilation holes, even if the wall arches outward during the filling process.
  • the cavity or the channel can absorb and store a great deal of air from the interior space in a short time and can release it again over a longer period of time, preferably to the environment.
  • the cover strip and / or the parallel fastening strips are made of stretchable material.
  • a cover strip with a stretchable Kick material instead of a sloppy cover strip, a cover strip with a stretchable Kick material.
  • at least one of the fastening strips can comprise a stretchable material.
  • a stretchable material can be elastic or deformable, for example stretchable, as is known, for example, from films that can be elongated under the action of force. Due to the air emerging from the inside of the sack through the ventilation openings, the cover strip and / or the fastening strips can now be stretched so that the channel can provide an enlarged volume compared to the initial state. This again ensures that a large volume of air can be removed from the inside of the sack in a short time.
  • the cover strip comprises a U-shaped fold on at least one of the fastening strips, i. the cover strip is folded over in such a way that its folded outer side is fastened to the wall with the fastening strip. This ensures that the fastening strip can easily bulge without its material being unduly stressed or the covering strip has a z-fold as an alternative or in addition to the u-fold.
  • the valve bag according to the invention can comprise paper, but also a material made of one or more plastics.
  • Plastics can be a film web, but also a fabric made of plastic tapes, in particular made of such plastic tapes that comprise a stretched polyolefin.
  • a plastic in the sense of the invention can also be a fleece material.
  • the aforementioned materials can also be combined.
  • one wall of the sack can comprise two layers, one layer consisting of paper and the other layer consisting of a plastic.
  • the aforementioned materials can also be laminated, laminated or otherwise coated.
  • the cover strip can consist of the same material or the same materials as the sack, but also of at least one different material.
  • the cover strip can be a separate strip, which preferably runs in the longitudinal direction of the bag.
  • the cover strip preferably extends over the entire length of the bag.
  • the fastening strips can be adhesive strips such as cold adhesive, hot-melt or dispersion, or extrusion strips.
  • extrusion strips or - in other words - longitudinal extrusion seams offer advantages because they are inexpensive.
  • a fastening strip can, however, also be a joining strip in which the wall and the covering strip are connected to one another by welding or sealing, in particular by ultrasonic, infrared or hot air welding or sealing.
  • the overlap strip can be a separate workpiece.
  • the cover strip can be an area of at least one wall which covers another area of the wall. Such a coverage area can be produced in a very simple and efficient manner by forming a tube from a flat web material. The walls and the cover strip are thus formed in one piece. The overlapping part then only needs to be fastened with two or more fastening strips, which run parallel but are spaced apart in the transverse direction, in order to form said channel.
  • the sack according to the invention has a ventilation capacity of at least 5 m 3 / h, in particular of at least 10 m 3 / h. This venting performance relates to air, but does not deviate significantly from it for other gases either.
  • the shortest path between the parallel fastening strips along the cover strip is at least 3% longer than the shortest path along the at least one wall. In this case, sufficient storage is made available for the air escaping from the inside of the sack, with the slackness of the covering strip being kept small at the same time. This helps in avoiding damage to the Covering strip. Furthermore, it can be provided that the invention provides that the shortest path between the parallel fastening strips along the covering strip is at most 20%, in particular at most 10% longer than the shortest path along the at least one wall.
  • a layer made of a filter material is provided within the channel.
  • This filter material serves as a further filter to further reduce the release of filling material to the environment.
  • the filter material has small pores that offer air permeability, but block the path of filling material particles and dust.
  • the filter material is preferably attached to the covering strip, the filter material preferably covering all of the ventilation openings of the covering strip, which are described in more detail below.
  • the possible ways of attaching the filter material to the cover strip can be the same as those for attaching the cover strip to the wall.
  • At least one fastening strip for the filter material can coincide with a fastening strip for the cover strip. However, it is preferred that the fastening strip for the filter material is spaced apart from the fastening strip for the cover strip, since the production of the sack is then made easier.
  • the filter material can include papers or plastics, these being in particular in the form of fleece.
  • At least one layer of a filter material is provided in the sack interior, the filter material also covering the ventilation openings here.
  • the filter material can be the same as the filter material, as has been described in connection with the cover strip.
  • the types of attachment can also be the same.
  • the filter material can replace the ventilation openings.
  • the at least one wall can comprise at least one cutout in certain regions, which is then completely covered by the filter material.
  • the air permeability of the ventilation openings in the at least one wall is greater than the air permeability of the cover strip.
  • the cover strip is free of ventilation openings and that instead the fastening strips have interruptions through which the air can flow.
  • a combination of both of the aforementioned venting options is also conceivable. If the covering strip has a lower air permeability, in particular a slow escape of the air into the environment is possible, so that the escape of filling material is again reduced.
  • a micro or nano perforation of the covering strip is advantageous in this context.
  • Micro-perforations for example with a density of 10 to 30, in particular 13, ventilation openings per square centimeter (cm 3 ), and nano-perforations, for example with a density of 50 to 100, in particular 64, ventilation openings per square centimeter (cm 3 ), can often be separated from one another distinguish.
  • the perforations can be produced, for example, with essentially conical needles or with essentially cylindrical needles.
  • the ventilation openings are preferably small enough so that no moisture can enter the sack or the channel from the outside. This is usually the case when the vents are smaller than 0.8 mm in diameter.
  • the ventilation openings of the at least one wall are spaced apart from the ventilation openings of the cover strip in the longitudinal direction of the bag. This distance is preferably at least one third of the bag height. It is advantageous that the air from the inside of the sack has to travel a longer distance in order to get into the surroundings. As a result, moisture that could penetrate the channel does not get into the interior of the bag, or at least only very slowly.
  • the ventilation openings can be designed as holes or as slots. Holes are often created by needles, whereas slots can often be created by knives.
  • the slots are provided in the at least one wall. in order to provide a large ventilation capacity here.
  • the ventilation capacity can be increased again if at least two slots are at an angle to one another, in particular at a right angle (90 °).
  • the length of the slots is preferably between 1 mm and 30 mm.
  • the ventilation openings in the at least one wall are spaced a maximum of half a bag length, in particular a maximum of a third of the bag length, particularly preferably a quarter of the bag length, from the valve base.
  • the air that is introduced into the interior of the sack during filling can escape undisturbed in the upper area. Only when the filling is almost complete does the product level reach these ventilation openings. In this way, a very high ventilation rate is guaranteed for almost the entire filling process.
  • the ventilation openings of the cover strip are at most half a sack length, in particular at most a third of the sack length and particularly preferably a quarter of the sack length, from the valveless bottom. In this way, a good protection against penetrating moisture is achieved, because any moisture that may penetrate has to travel a long way into the inside of the bag.
  • the surface of the sack that is provided with ventilation openings is a maximum of 15% of the total surface of the sack.
  • valve bottom comprises two bottom flaps, the first bottom flap comprising parts of the covering strip, the second bottom flap at least partially covering the first bottom flap when viewed from the outside. This prevents that moisture gets into the channel via the bottom flap and from here on a short way via the ventilation openings in the at least one wall into the interior of the bag. The moisture protection is thus increased.
  • valveless bottom comprises two bottom flaps, the first bottom flap comprising parts of the covering strip, the first bottom flap at least partially covering the second bottom flap as seen from outside the sack. In this way it can be prevented that moisture which penetrates through the ventilation openings into the channel gets into the bag interior via the bottom flap over a short distance. The moisture protection is thus increased.
  • the moisture protection can be further improved if at least one base is covered with a base cover sheet from the outside and / or with an inner bar from the inside of the bag.
  • the stated object is achieved according to the invention in that at least one cover strip is produced on the first or the second wall, with which the ventilation holes are covered, the cover strip being provided with at least one longitudinal fold.
  • the cover strip In order to be able to produce a sack in which at least one channel is provided on the outside of at least one wall which covers the ventilation openings and which is formed by at least two parallel fastening strips and a cover strip, the cover strip also includes ventilation openings and the shortest path between the parallel fastening strip along the cover strip is longer than the shortest path along the at least one wall, the cover strip is provided with at least one fold running in the longitudinal direction. This is, for example, the edge of the cover strip, which is folded once so that the edge area is then designed with two layers. The folded edge is preferably fastened to the wall with the fastening strip.
  • the cover strip is provided with a u-fold and / or with two folds, the two folding directions running in opposite directions. This creates a z-fold. This means that the cover strip is in three layers in the area of the fold.
  • the folds mentioned are preferably produced by guide plates, along which the flat web transported by a transport device, such as transport rollers, is guided.
  • a transport device such as transport rollers
  • pre-break rollers and / or pressure rollers can be provided with which the folded edge is pre-embossed and / or the folded edge that has been formed is fixed again.
  • Vent holes are made in the flat web before it is processed into a tube. Making vent holes at this point is very easy. It can be done, for example, by a roller, the outer circumference of which is fitted with needles and / or knives.
  • the flat web and the cover strip are connected to one another, in particular also before the tube is formed.
  • the covering strip is part of the flat sheet and develops its actual functionality after the tube has been formed by being attached to the wall by two fastening strips.
  • a filter material is applied to the flat web and / or to the cover strip and fastened there.
  • the filter material is preferably in web form and is drawn off and applied from a roll. It is preferably fastened with a dispersion adhesive, with a cold adhesive or with a hot-melt adhesive. It is advantageous if the filter material is applied to the flat web before a tube is formed from the flat web. In this case, the application and attachment of the filter material is particularly simple.
  • the Figure 1 shows the cross section through a first embodiment of a valve bag 1 according to the invention. It comprises a first wall 2, which in the present example represents the rear wall. This first wall is connected via the side edges 3, 4 to the second wall 5, which represents the front wall.
  • the front wall 5 is formed by a first region 6 and a second region 7.
  • the edge 8 of the first region 6 is fastened with a fastening strip 9 to the surface facing the bag interior 10.
  • the strip crossing over the fastening strip 9 forms a cover strip 11 which covers the ventilation holes 12 in the second wall 5.
  • the cover strip 11 is connected with its edge 13 via a fastening strip 14 on the outer surface of the first area 6 of the second wall 5.
  • the outer surface of the cover strip is attached to the first area 6, so that a U-shaped fold 15 or, in the flat state, a double-layer area of the cover strip is formed.
  • a channel 16 is formed, the volume of which can be changed over a very large area.
  • This channel also includes ventilation openings 17 so that the air that has entered the channel from the inside of the bag can escape into the environment.
  • the covering strip 11 can be delimited from the area 7 of the front wall 5 by the fastening strip 9.
  • a filter material 18 is preferably provided, which is fastened to the cover strip via two fastening strips 19.
  • the Figure 2 shows a further exemplary embodiment of a valve bag 1 according to the invention.
  • a z-shaped fold 21 is provided in this exemplary embodiment, which is created by producing a double fold.
  • the z-shaped fold is characterized by the fact that three layers are formed here. Even if in the Figure 2 it can be seen that the z-shaped fold 21 is arranged in the area of the fastening strip 14, so the z-shaped fold can be arranged at any position between the fastening strip 9 and the fastening strip 14.
  • Several z-shaped folds 21 are also conceivable.
  • the cover strip 11 of the valve bag 1 even comprises a Z-shaped fold 21 and a U-shaped fold 15.
  • the Figure 3 shows a further configuration option which can also be combined with all of the other exemplary embodiments disclosed in this patent application.
  • the covering strip 11 is fastened to the area 6 of the front wall with a third fastening strip 22.
  • This third fastening strip 22 divides the channel 16 into a first partial channel 23 and a second partial channel 24, with the ventilation openings 12 from Guide the inside of the sack 10 into the first partial channel 23.
  • the ventilation openings 17 lead from the second sub-channel 24 into the environment. So that the air can now also pass from the first partial channel 23 into the second partial channel 24, the fastening strip comprises at least one interruption.
  • the at least one interruption is preferably so long that the ventilation capacity of the bag is not impaired.
  • the cover strip 11 is designed as a separate workpiece. It is therefore not formed in one piece with part of the front wall 5.
  • This separate cover strip 11 is attached to the front wall 5 of the valve bag via the two attachment strips 9, 14.
  • the cover strip 11 comprises U-shaped folds 15 on its two edges.
  • the front wall 5 and the rear wall 2 of the valve bag 1 can already have been produced as a tube, for example by a blown film extrusion process or a circular weaving process.
  • a tube can also be made from a flat web in which the two side areas have been turned over to form an overlap and in which the overlapping edges are connected by a joint seam.
  • FIG. 5 now shows some steps of a method according to the invention for producing a valve bag.
  • a flat web 50 is first unwound from an unwinding device (not shown). This is followed by the introduction of ventilation openings 17, which is again not shown.
  • These ventilation openings are preferably not introduced continuously in the longitudinal direction of the flat web, but rather in cycles.
  • a roller can roll on the flat web, the peripheral surface of which is only partially covered with needle, cutting or punching tools.
  • it can be provided that such a roller is brought into contact with the flat web 50 at the points at which the ventilation openings 17 are to be introduced.
  • an adjustment mechanism can be provided which brings the roller into contact with the flat web in cycles.
  • the flat web preferably runs over a counter roller.
  • the ventilation openings 12 can be made in the flat web 50.
  • a roller 51 is shown with which individual, short cuts are produced in the flat web 50.
  • the circumferential surface 52 of the roller 51 is covered with knives 53, two adjacent knives at an angle to one another, in particular a right angle.
  • An adjustment mechanism can also be provided for the roller 51, which brings the roller into contact with the flat web in cycles.
  • the adjustment mechanism for the roller 51 works independently of the adjustment mechanism mentioned in the preceding paragraph, since the ventilation openings 12 and 17 are preferably introduced offset in the transport direction of the flat web.
  • the flat web 50 is covered with a filter material 55, which is attached to the flat web 50.
  • This filter material can be applied to the flat web in web form.
  • the filter material can be made available as a roll and unwound within an unwinding device.
  • the filter material is already provided with two lateral adhesive strips in its roll form.
  • two adhesive traces 56, 57 are applied to the flat web and / or to the web-shaped filter material, the ventilation openings 17 lying completely within these adhesive traces.
  • the adhesive traces can comprise a dispersion adhesive, a hot melt adhesive or a cold glue; but they can also comprise an extrudate. In the latter case, plastic is converted into a melt form in an extruder and applied in this form as traces through nozzles.
  • the flat web and the web-shaped filter material are joined together, which is indicated by the arrows 58, and - for example by means of a pair of press rollers - are pressed together and optionally also cooled.
  • the filter material 55 can also be applied to the flat web in the form of a slip, the filter material being at least dimensioned such that it completely covers the ventilation openings 17 concentrated on a surface section.
  • Ready-made slips can be used to provide the filter material in slip form. It is preferred, however, if the filter material is also present in roll form and is separated into slips of paper by a separating tool, for example a cutting tool.
  • Adhesive traces are now preferably applied to the flat web 50, a circumferential adhesive tracing being generated so that the air that is to pass through the filter material cannot escape through a gap in the adhesive tracing.
  • the described procedures for applying filter material can also be used if the ventilation openings 12 are to be covered with a filter material.
  • the Figure 7 shows the areas 6 and 7 which have already been turned over and which are now fastened to one another with the fastening strips 9 and 14.
  • there are two extrusion nozzles which introduce at least one molten plastic material in the form of at least two parallel tracks between the areas 6 and 7 and thus delimit the channel 16.
  • at least one pressing device for example a pressure roller
  • the areas 6 and 7 can be connected to one another along the fastening strips 9 and 14, so that a permanent and durable connection can be generated.
  • At least one cooling device can be provided in order to be able to cool the fastening strips, in particular if they were created under the action of heat.
  • the cooling device can be comprised by the pressing device.
  • pressure rollers can be cooled.
  • a valve sack 101 - referred to as a "sack" for short - can now be seen, which preferably consists of a tube according to the exemplary embodiments of Figures 1 to 7 is made.
  • this hose is separated into hose pieces, a bottom opening is formed on both ends and this bottom opening is then closed to form a bottom.
  • the bottoms of which only one bottom 102 can be seen, are shaped as cross bottoms.
  • a sack end is drawn up during manufacture, forming a bottom rectangle and two bottom triangles 103.
  • the side flaps 104 and 105 are then folded over so that they partially overlap.
  • a base cover sheet 106 is preferably fixed on the base that has already been created, this preferably being connected to both base triangles 103 and to both side tabs 104 and 105.
  • the bottom 107 which is not visible, is designed similar to the bottom 102, but before the side flaps 104 and 105 are folded over, a valve 108 is placed on one of the two bottom triangles and fastened there so that the side flaps are folded over the valve.
  • a valve label can be placed on one of the bottom triangles and fastened there, which forms the valve 108 by folding over the side flaps.
  • the optional bottom cover sheet is then only connected to the valve and not to the bottom triangle below.
  • the valve 108 creates an access to the inside of the sack from the surroundings and therefore offers the possibility of filling the sack with a filling material from the outside.
  • valve 108 is designed to be closable in order to allow moisture to penetrate and parts of the filling material to escape during subsequent storage after filling to reduce.
  • the base 107 can be referred to as a valve base, while the base 102 may be referred to as a valveless base.
  • the second wall 5 continues into the side flap 104, which is preferably folded over the side flap 105.
  • the wall 5 comprises the channel 16 which is delimited by the fastening strips 9 and 14, the fastening strip 9 being shown with a broken line since it is not visible in a finished sack.
  • the ventilation openings 17 are arranged closer to the valveless floor than the ventilation openings 12. The distance between the ventilation openings 17 and the floor 102 is preferably a maximum of a third, preferably a maximum of a quarter, in particular a fifth of the total bag length L.
  • the ventilation openings 17 are arranged closer to the valve base than the ventilation openings 12.
  • the distance between the ventilation openings 12 and the base 107 is preferably a maximum of a third, preferably a maximum of a quarter, in particular a fifth of the total bag length L.
  • the Figure 9 shows the section IX - IX through the bag 101 (see Figure 8 ). Sections through the floors 102 and 107 can now be seen. In the valveless base 102, the folding sequence of the side flaps 104 and 105 can be seen in particular. Since the section IX-IX also forms a section through the channel 16, the side flap 104 appears to have three layers, since in addition to the relevant parts of the areas 6 and 7, the filter material 18 can also be seen. The side flap 104 is on the inside, ie it was folded over before the side flap 105 was folded over. Therefore, the side flap 105 is on the outside.
  • the channel 16 Due to the bottom cover sheet 106, the channel 16 is not or hardly accessible via the tab 105, so that almost no moisture can penetrate into the sack via the bottom 102. Should this be the case, it should Only diffuse moisture over the entire length of the sack in order to reach the inside of the sack.
  • the valve base 107 comprises the side flaps 109 and 110, the side flap 109 being designed analogously to the side flap 105. Accordingly, the side flap 110 is designed analogously to the side flap 104. In contrast to the base 102, the side flap 110 in the case of the base 107 is first folded over, ie it is on the inside. The side flap 109 thus forms the outer flap. Since the valve 108 is also arranged below the side flap 110 and - at least when filling - presses the individual layers of the side flaps onto one another, it is avoided that parts of the filling material get into the channel 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Making Paper Articles (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)
  • Packages (AREA)
EP17777023.7A 2016-09-27 2017-09-27 Ventilsack sowie verfahren und system zur herstellung eines ventilsacks Active EP3519312B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL17777023T PL3519312T3 (pl) 2016-09-27 2017-09-27 Worek zaworowy i sposób i układ wytwarzania worka zaworowego
HRP20202057TT HRP20202057T1 (hr) 2016-09-27 2020-12-22 Vreća sa ventilom i postupak i sustav za proizvodnju vreće sa ventilom

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102016218626 2016-09-27
DE102016220428.9A DE102016220428A1 (de) 2016-09-27 2016-10-18 Ventilsack sowie Verfahren und System zur Herstellung eines Ventilsacks
PCT/EP2017/074538 WO2018060275A1 (de) 2016-09-27 2017-09-27 Ventilsack sowie verfahren und system zur herstellung eines ventilsacks

Publications (2)

Publication Number Publication Date
EP3519312A1 EP3519312A1 (de) 2019-08-07
EP3519312B1 true EP3519312B1 (de) 2020-11-11

Family

ID=61564334

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17777023.7A Active EP3519312B1 (de) 2016-09-27 2017-09-27 Ventilsack sowie verfahren und system zur herstellung eines ventilsacks

Country Status (12)

Country Link
US (1) US11401076B2 (hr)
EP (1) EP3519312B1 (hr)
CN (1) CN109996737B (hr)
BR (1) BR112019006122B1 (hr)
DE (1) DE102016220428A1 (hr)
DK (1) DK3519312T3 (hr)
ES (1) ES2837756T3 (hr)
HR (1) HRP20202057T1 (hr)
HU (1) HUE052065T4 (hr)
PL (1) PL3519312T3 (hr)
PT (1) PT3519312T (hr)
WO (1) WO2018060275A1 (hr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202018006418U1 (de) 2018-06-15 2020-05-06 Greif-Velox Maschinenfabrik Gmbh Ventilsackabfüllvorrichtung
EP3581500A1 (de) 2018-06-15 2019-12-18 GREIF-VELOX Maschinenfabrik GmbH Ventilsackabfüllvorrichtung

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Also Published As

Publication number Publication date
US11401076B2 (en) 2022-08-02
PL3519312T3 (pl) 2021-05-17
US20200122893A1 (en) 2020-04-23
HUE052065T4 (hu) 2021-08-30
EP3519312A1 (de) 2019-08-07
HRP20202057T1 (hr) 2021-03-05
ES2837756T3 (es) 2021-07-01
WO2018060275A1 (de) 2018-04-05
HUE052065T2 (hu) 2021-04-28
CN109996737A (zh) 2019-07-09
BR112019006122A2 (pt) 2019-06-18
PT3519312T (pt) 2020-12-28
BR112019006122B1 (pt) 2022-11-16
DE102016220428A1 (de) 2018-03-29
CN109996737B (zh) 2021-11-12
DK3519312T3 (da) 2021-02-08

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