EP3052395B1 - Sack and sack manufacturing method - Google Patents
Sack and sack manufacturing method Download PDFInfo
- Publication number
- EP3052395B1 EP3052395B1 EP14771926.4A EP14771926A EP3052395B1 EP 3052395 B1 EP3052395 B1 EP 3052395B1 EP 14771926 A EP14771926 A EP 14771926A EP 3052395 B1 EP3052395 B1 EP 3052395B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bag
- sections
- cover sheet
- folded
- bag according
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000000463 material Substances 0.000 claims description 69
- 239000004744 fabric Substances 0.000 claims description 23
- 239000004033 plastic Substances 0.000 claims description 16
- 229920003023 plastic Polymers 0.000 claims description 16
- 239000000853 adhesive Substances 0.000 claims description 15
- 230000001070 adhesive effect Effects 0.000 claims description 15
- 238000005520 cutting process Methods 0.000 claims description 14
- 230000003313 weakening effect Effects 0.000 claims description 13
- 239000012943 hotmelt Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 239000002985 plastic film Substances 0.000 claims description 8
- 229920006255 plastic film Polymers 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000004026 adhesive bonding Methods 0.000 claims description 4
- 239000004831 Hot glue Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 229920002994 synthetic fiber Polymers 0.000 claims 2
- 230000001464 adherent effect Effects 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 claims 1
- 239000002131 composite material Substances 0.000 description 13
- 239000005026 oriented polypropylene Substances 0.000 description 8
- 238000004806 packaging method and process Methods 0.000 description 6
- 229920000098 polyolefin Polymers 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000009958 sewing Methods 0.000 description 4
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 2
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000003698 laser cutting Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 206010040954 Skin wrinkling Diseases 0.000 description 1
- 206010041662 Splinter Diseases 0.000 description 1
- 206010053648 Vascular occlusion Diseases 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Images
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
-
- 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
- B65D33/06—Handles
- B65D33/08—Hand holes
-
- 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
-
- 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
- B65D33/16—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
- 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
- B65D2203/00—Decoration means, markings, information elements, contents indicators
- B65D2203/02—Labels
Definitions
- the invention relates to a bag, in particular box bag or box valve bag, with a tubular bag body, wherein the bag body is folded at least one end portion to a bottom and the folded bottom is connected to a cover sheet, and a method for producing such a bag.
- the tubular bag body consists of a tubular material or a flat material joined together at its longitudinal edges.
- Bags with folded bottom usually have a box shape or cuboid shape. They offer optimum material surface utilization, good stacking capacity and, due to the cuboid shape, improved volume utilization. In addition to the box shape, there is still the quasi-box shape, which has a rectangular folded bottom on one side and an end closed by an adhesive, welding or sewing seam on the other side.
- valves are made in the manufacture of the bag on a bottom, which consist of either a hose or a sheet material and inserted between the end flaps of the bag body and optionally folded.
- a bottom consist of either a hose or a sheet material and inserted between the end flaps of the bag body and optionally folded.
- box bags one speaks of box valve bags.
- Box sacks, box valve bags, or quasi-box sacks usually have a capacity of 10, 25 or 50 kg, for certain applications also up to 1000 kg and are used for the packaging of goods, in particular bulk materials.
- Box sacks are nowadays commonly made of plastic films or plastic fabrics.
- Plastic film has no high strength and therefore requires a large material thickness. In addition, it is heat sensitive and not dimensionally stable due to high modulus of elasticity.
- Plastic fabric of monoaxially stretched plastic tape has a high strength and is dimensionally stable, especially when it is coated. By suitable coating the plastic fabric is also very good printable. Compared to plastic film material consumption is significantly lower when using plastic fabric with the same carrying capacity of the bags.
- Sacks of fabric made of monoaxially stretched polymer, in particular polyolefin, preferably polypropylene, tapes, which have one or two sides, have proven outstandingly well in practice thermoplastic material, in particular polyolefin may be coated.
- a bag is from the document WO 95/30598 known.
- the tapes of this fabric are made by stretching polyolefin films 4 to 10 times their original length and cutting the stretched polyolefin film. Alternatively, the film may be cut into strips before drawing and then the strips stretched into ribbons. By the stretching process, the molecular chains are aligned in the ribbon longitudinal direction and have in the direction of stretching about 6- to 10-fold strength over the original state.
- the ribbon width is usually about 1.5-10 mm, the thickness 20-80 microns.
- the ribbons splinter When loaded in the transverse direction, the ribbons splinter, which is why they are woven in round or flat fabric from each other about right-angled warp and weft layers.
- the fabric then has the same high tensile strength in all directions. Sacks made from such a fabric have been proven for billions of times around the world for the packaging of bulk goods of all kinds for many years.
- a coating of melt of preferably the same material as the tapes can be applied and pressed onto the fabric on one or both sides.
- melt coating a lamination of the fabric with plastic film is also provided.
- Such a fabric / film composite has a construction of a fabric of monoaxially drawn polymer tapes, in particular polyolefin or polyester tapes, preferably polypropylene or polyethylene terephthalate tapes, an OPP (Oriented Poly Propylene) film and an intermediate connecting layer of thermoplastic or adhesive ,
- the OPP film may be printed on the fabric facing surface.
- This material structure shows both high strength (through the fabric) and excellent printability (through the OPP film). Since the OPP film is stretched, it also has a very good dimensional stability.
- BOPP films can also be used, which are so-called Biaxially Oriented Poly Propylene films.
- tissue-film composites or films it is expedient to provide an OPP film for the fabric-film composite which (at least) has a film seal layer on its surface facing away from the tissue.
- the fabric of the fabric-film composite on one or both sides with a fabric sealing layer of a thermoplastic To coat plastic.
- the film seal layer and / or the tissue sealing layer has a melting point which is below the crystallite melting point of the tissue band material and the OPP film.
- bag body of multilayer film combined with a cover sheet of multilayer film Bag body of multilayer film combined with a cover sheet of film composite; Bag body of film composite combined with a cover sheet of multilayer film; and bag body of film composite combined with a cover sheet of film composite.
- these embodiments of the bag do not offer the same high strength as the use of a fabric of monoaxially stretched plastic tapes, but this disadvantage can be mitigated by increasing the number of foil layers.
- a cover sheet is applied to the folded end tabs of the bag body and connected in a flat manner to the folded bottom.
- a hot air welding method can be used, in which facing coated surfaces of the folded bottom and the cover sheet heated by hot air to plasticization, pressed against each other and then cooled.
- An alternative bonding method is the surface bonding of the folded bottom and the cover sheet, for example by means of hot melt adhesive.
- woven fabric box bags made of stretched plastic tapes are also advantageous for the retail trade and can be used, for example, for packaging animal feed, etc.
- a handle would be advantageous to facilitate carrying.
- the attachment of the handle should not reduce the carrying capacity of the bag and the handle itself should have a high load capacity and not detach from the bag.
- pamphlet WO 2012/103560 A1 discloses a bag with a tubular bag body having a bottom fold so that the bag has substantially a rectangular bottom.
- the closing of the bag is effected by a releasable connection of at least two overlapping layers of the bottom, whereby an opening of the bag is made possible without destroying the bag material.
- the overlap of the two plies continues beyond the seam to form handles in the areas beyond the seam.
- the document US 2011/0158560 A1 discloses a folding bag, which has embedded in the pocket material grip elements and a band handle.
- the strap handle is mounted inside the folding bag, and the handle elements provide access to this.
- the material for the cover sheet is a web material on which initially the formation of the grip holes takes place, then the folds of the intermediate sections and the outer sections are made and finally by means of cross sections, the cutting of the cover sheets in a repeat length.
- the grip holes are formed by laser perforation, laser cutting or mechanical stamping in the web.
- the topsheet material can be prefabricated off-line and then fed to any box valve bag system without special modifications. Since the thus pre-made cover sheet material has no asymmetrical thick spots, it is good on rolls wound up. Furthermore, it is advantageous in the manufacture of the cover sheet material to fix the intermediate sections at the central section, in particular close to the intermediate fold edges, or to fix the intermediate sections to the outer sections, in particular close to the inner fold edges, to thereby prevent slippage of said sections. This enormously facilitates automatic bag production in packaging machines.
- Another advantage of this embodiment is evident in the use of the bag. Namely, the passage of the fingers through the grip holes is facilitated when the Intermediate sections abut as close to the central section. This is accomplished by adhering the intermediate portions to the central portion, preferably with the adhesive locations proximate the inter-fold edges.
- the intermediate sections adhere to the outer sections, wherein preferably the traps run close to the inner folding edges.
- the traps are formed as a weld, extrusion seam, adhesive line or surface, in particular of hotmelt material, or as a sewing seam. Gluing lines or surfaces can be approximated by a variety of individual glue dots.
- a further advantage is that the folded and thus fixed cover sheet material has no asymmetrical thick areas and is therefore good on reels windable, which enormously facilitates the automatic bag making in packaging machines.
- the intermediate sections are fixed in sections, in particular punctiform, releasably attached to the outer sections.
- the intermediate sections are fixed in sections, in particular punctiform, releasably fixed to the central portion.
- an intermediate section overlaps an outer section and is fixed in sections, in particular punctiform, releasably attached to the outer section.
- bags of the type mentioned above which were closed with the cover sheets according to the invention, due to the high strength of folded bottom and cover sheet not without further open nondestructive. Since the bonding or welding of the cover sheet with the folded bottom can not be easily solved, such sacks are usually opened by the bag body itself is slashed with a sharp object, but in bags made of a fabric of monoaxially stretched polymer ribbon due to its extremely high strength only with Effort is to accomplish. After slitting the bag, there is also the problem of poor handling of the opened bag.
- the invention provides in a further embodiment that the central portion of the cover sheet has at least one tear line defined by cuts, perforations or material weakening, at which tear line the cover sheet can be torn open without aids, by simply pulling the handles apart become.
- the cuts, perforations or material weakening are preferably produced by means of laser cutting or mechanical punching.
- At least one tear line is arranged to extend between the two end flaps. In this configuration, the user gains access to the interior of the bag by tearing the topsheet along the tear line.
- the at least one tear line extends over the entire repeat length of the cover sheet.
- the at least one tear line extends only over part of the repeat length of the cover sheet.
- the at least one tear line can be covered by a releasably adhering to the cover sheet protective tape.
- the protective tape also serves to protect the bag contents from the external environment or to prevent leakage of powdery bag material when the tear line is formed as a perforation or cuts.
- the protective tape has a free end which does not adhere to the cover sheet. This can be accomplished, for example, by providing a release agent or ensuring that the guard band does not come in contact with an adhesive at the free end.
- the cover sheet in the torn-open state not only has a slot-shaped opening, but an opening with a defined width. This can be achieved by providing two tearing lines running parallel to one another in the cover sheet, whereby a strip is torn out of the cover sheet for opening. In order to be able to grasp these strips torn out more easily, the tear-off lines can be formed at one end as cutting lines.
- the bottom of the bag is folded such that end flaps of opposing walls of the bag body are folded together and the end flap of one wall covers the end flaps of the other wall with a cover width a halving line running at half the distance between the two tear lines is offset by half the overlapping width to a center line of the bottom of the bag.
- the cover sheet of a material which is selected from a fabric of plastic tape or a nonwoven plastic material (eg plastic fleece) or a composite of the fabric of plastic tape and the nonwoven Plastic material or a plastic film connected to a network structure, wherein the material optionally at least one side with at least one plastic layer and / or at least one plastic film, eg an OPP film is coated.
- the cover sheet is printable and can therefore serve as a "display" when unopened.
- the cover sheet is made of the same material as the bag body.
- Fig. 1 shows a box valve bag 1 according to the invention in the empty, folded state in plan view.
- the bag 1 comprises a tubular bag body 1a made of one of the above-mentioned materials or composites, which is folded at its two end portions to bottoms 1d, 1e by folding end flaps of the front wall 1b and the back wall 1c to each other with the formation of triangular Eckeinelle.
- the folding of these soils is well known to the skilled person and, for example, in the WO 95/30598 described.
- the trays 1d, 1e assume a rectangular configuration.
- the folded bottom 1 d at the first end of the bag body 1 a is connected by hot air welding or gluing, for example with hot melt adhesive, with a cover sheet 10, which will be described with reference to FIGS Fig. 2 is explained in more detail.
- the folded bottom 1 e at the second end of the bag body is provided with a valve sheet 2 and also connected to a cover sheet 11.
- the cover sheets 10, 11 have a repeat length L and pass preferably of the same material as the bag body 1a. However, any other of the above-mentioned materials may also be used.
- the cover sheets 10, 11 may be provided with a printable coating or a printed film.
- the cover sheet 10 comprises a central portion 10a delimited by two opposing inner fold edges 10b, 10c and two intermediate portions 10d, 10e extending laterally from the inner fold edges 10b, 10c, each intermediate portion 10d, 10e of one of the inner fold edges 10b, 10c and an intermediate fold edge 10f, 10g is limited.
- each intermediate portion 10d, 10e of one of the inner fold edges 10b, 10c and an intermediate fold edge 10f, 10g is limited.
- the cover sheet 10 comprises a central portion 10a delimited by two opposing inner fold edges 10b, 10c and two intermediate portions 10d, 10e extending laterally from the inner fold edges 10b, 10c, each intermediate portion 10d, 10e of one of the inner fold edges 10b, 10c and an intermediate fold edge 10f, 10g is limited.
- the intermediate sections 10d, 10e are turned inwards at the inner folding edges 10b, 10c.
- the outer portions 10h, 10j are folded outwardly at the intermediate folding edges 10f, 10g.
- perforations or material weakening grip holes 12, 13 are formed, which are preferably produced by laser perforation or cutting or mechanical punching.
- perforations or weakening material grip holes 14, 15 are formed in the intermediate portions 10d, 10e.
- the grip holes 12, 13 in the central portion 1a are in the folded state of the cover sheet 10 substantially flush with their adjacent handle holes 14, 15 of the intermediate portions 10d, 10e arranged.
- the intermediate portions 10d, 10e adhere to the central portion 10a by means of adhesion points 16, 17, which are formed in this embodiment linear or as elongated, narrow surfaces which extend close to the insects 10f, 10g.
- the adhesion points 16, 17 are formed as a weld, extrusion seam, adhesive line or surface, in particular of hotmelt material, or alternatively as a sewing seam.
- the intermediate sections 10d, 10e are fixed detachably to the outer sections 10h, 10j by means of fixing sections 18, 19, which are in particular punctiform or small-area.
- the fixing sections are realized by splices, in particular hotmelt splices, or welds.
- the gripping holes 12, 13, 14, 15 having portions of the cover sheet 10 are not from the bag 1 from.
- the user of the bag 1 can easily solve this fixation simply by passing his fingers through the grip holes 12, 13, 14, 15, pulling up while folding up the intermediate sections 10d, 10e and the respective parts of the central section 10a, as in Fig. 3 represented by arrows.
- the cover sheet 10 can be provided with at least one tear line 20 defined by cuts, perforations or material weakening.
- Fig. 5 shows in perspective a portion of the folded topsheet 10 with a tear line 20 formed in the central portion 10a.
- the tear line is shown Covered by a releasably by means of adhesive strips 23, 24 on the cover sheet 10 adhesive protective tape 22.
- the guard band 22 In order for the guard band 22 to be easily peeled off, it has a free end 22a which does not adhere to the topsheet 10, as in FIG Fig. 6 easy to recognize.
- the tear line 20 extends over the entire repeat length L.
- Fig. 7 shows an embodiment of the bag, in which the on the folded bottom 1 d of the bag body 1 a glued or welded cover sheet 10 has two mutually parallel tear lines 20, 21 which define a tear strip in the cover sheet 10 between each other.
- the tear lines are formed at one end for ease of gripping than cutting lines 20a, 21a. So that the end region of the tear strip located between the cut lines 20a, 21a does not adhere to the bag body, a separating means 25 is provided.
- the tear lines 20, 21 do not extend over the entire repeat length L.
- FIG. 8 In a schematic plan view of the folded bottom 1d, end flaps 1f, 1g of opposite walls 1b, 1c of the bag body 1a are folded together, the end flap 1g of one wall 1c covering the end flaps 1f of the other wall 1b with a covering width x ,
- the configuration of folded bottom 1d and cover sheet 10 is such that a halving line h extending half the distance y between the two tear lines 20, 21 is offset by half the overlapping width x to a center line m of the bottom 1d.
- Fig. 9 shows the production of cover sheets 10 from a web-shaped material 30.
- the web-shaped material 30 by laser perforation handle holes 12, 13, 14, 15 are generated.
- two parallel tear lines 20, 21 are also arranged at a distance y from each other, which are formed in end regions as continuous cut lines 20a, 21a.
- the material 30 is provided with a release agent 25 which prevents it from sticking to the bag body.
- the sheet material 30 thus prepared is then folded outwardly along the inner folding edges 10b, 10c and along the intermediate folding edges 10f, 10g, thereby forming the central portion 10a, the intermediate portions 10d, 10e and the outer portions 10h, 10j.
- cover sheets 10 are cut in the predefined repeat length L by means of cross-sections 31, wherein after folding, but before cutting the web material 30 can be wound onto a roll from which it is in a bag confectioning machine for cutting in the repeat length L of the Role is handled.
- Fig. 10 1 shows an embodiment of the folded cover sheet 10 which defines the central portion 10a to be connected to the bag bottom, which is bounded by two opposing inner fold edges 10b, 10c, two intermediate portions 10d, 10e extending laterally from the inner fold edges 10b, 10c, each intermediate portion 10d, 10e is bounded by one of the inner folding edges 10b, 10c and an intermediate folding edge 10f, 10g, and two outer sections 10h, 10j laterally extending from the intermediate folding edges 10f, 10g.
- the intermediate sections 10d, 10e are turned inwards at the inner folding edges 10b, 10c. Unlike the in Fig. 2 illustrated embodiment of the folding of the cover sheet 10 takes place in the embodiment of Fig.
- the outer portions 10h, 10j are folded outwardly at the intermediate fold edges 10f, 10g, again (and in contrast to the embodiment of FIG Fig. 2 ) to the side facing away from the bottom of the bag.
- the outer sections 10h, 10j, as well as the central section 10a, are connected to the folded bottom 1d.
- perforations or material weakening grip holes 12a, 13a are formed, which are preferably produced by laser perforation or cutting or mechanical punching.
- perforations or weakening material grip holes 14, 15 are formed in the intermediate portions 10d, 10e.
- the grip holes 12a, 13a in the outer portions 10h, 10j are in the folded state of the topsheet 10 in FIG Substantially flush with their adjacent handle holes 14, 15 of the intermediate portions 10d, 10e arranged.
- the intermediate sections 10d, 10e adhere to the outer sections 10h, 10j by means of adhesion points 16a, 17a, which in this exemplary embodiment are linear or elongate, narrow surfaces which run close to the inner folding edges 10b, 10c.
- the adhesion points 16a, 17a are formed as a welded seam, extrusion seam, adhesive line or surface, in particular of hotmelt material, or alternatively as a sewing seam.
- the intermediate portions 10d, 10e by means of fixing portions 18a, 19a, which are formed in particular punctiform or small area, releasably fixed to the central portion 10a.
- the fixing portions 18a, 19a are realized by splices, in particular hotmelt splices, or welds.
- the portions of the cover sheet 10 having the grip holes 12a, 13a, 14, 15 do not protrude from the bag 1.
- the user of the bag 1 can easily solve this fixation by simply grasping with his fingers through the grip holes 12a, 13a, 14, 15, pulling up the intermediate sections 10d, 10e and the respective parts of the outer sections 10h, 10j works.
- the bag 1 When lifting the bag 1 by means of the grip holes 12a, 13a, 14, 15, the bag 1 forms a tapered, seen in side view "pointed" shape on the folded bottom 1d, which is why the connection between the cover sheet 10 and the bag body 1a is subject to only a shearing load but no peeling stress. Peel loads would result in peel-off of the topsheet at relatively low forces and are therefore undesirable.
- Fig. 11 shows one of the embodiment of Fig. 10 similar embodiment of the folded cover sheet 10, which differs from the embodiment of Fig. 10 differs in that the width of the intermediate portions 10d, 10e is greater than half the distance between the mecanicfaltkanten 10b, 10c (or in other words is greater than half the width of the central portion 10a).
- the intermediate portion 10d overlaps the intermediate portion 10e.
- the intermediate portions 10d is fixed by means of fixing portions 18b, which are formed in particular punctiform or small area, detachably on the outer portion 10j.
- the fixing sections 18b are realized by splices, in particular hotmelt splices, or welds.
- the remaining configuration of this embodiment of the cover sheet 10 corresponds to that of Fig. 10 Therefore, a repetition of the description can be omitted and instead to the description of the embodiment Fig. 10 is referenced.
- FIG. 10 shows the production of cover sheets 10 from a sheet material 30 in the convolution configuration of FIG Fig. 9 ,
- grip holes 12a, 13a, 14, 15 are generated by laser perforation.
- two parallel tear lines 20, 21 are also arranged at a distance y from each other, which are formed in end regions as continuous cut lines 20a, 21a.
- the material 30 is provided with a release agent 25 which prevents it from sticking to the bag body.
- the sheet material 30 thus prepared is then folded outwardly along the inner folding edges 10b, 10c and along the intermediate folding edges 10f, 10g, thereby forming the central portion 10a, the intermediate portions 10d, 10e and the outer portions 10h, 10j.
- the cover sheets 10 are cut in the predefined repeat length L by means of cross-sections 31, wherein after folding, but before cutting the web material 30 can be wound onto a roll from which it is in a bag confectioning machine for cutting in the repeat length L of the Role is handled.
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- Engineering & Computer Science (AREA)
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Description
Die Erfindung betrifft einen Sack, insbesondere Kastensack oder Kastenventilsack, mit einem schlauchförmigen Sackkörper, wobei der Sackkörper an zumindest einem Endbereich zu einem Boden gefaltet ist und der gefaltete Boden mit einem Deckblatt verbunden ist, sowie ein Verfahren zur Herstellung eines solchen Sackes.The invention relates to a bag, in particular box bag or box valve bag, with a tubular bag body, wherein the bag body is folded at least one end portion to a bottom and the folded bottom is connected to a cover sheet, and a method for producing such a bag.
Der schlauchförmige Sackkörper besteht aus einem schlauchförmigen Material oder einem an seinen Längsrändern miteinander verbundenem Flachmaterial.The tubular bag body consists of a tubular material or a flat material joined together at its longitudinal edges.
Säcke mit gefaltetem Boden weisen zumeist eine Kastenform oder Quaderform auf. Sie bieten eine optimale Materialflächennützung, gutes Stapelvermögen, und wegen der Quaderform verbesserte Volumennutzung. Neben der Kastenform gibt es noch die Quasi-Kastenform, die an einer Seite einen rechteckig gefalteten Boden und an der anderen Seite ein durch eine Klebe-, Schweiß- oder Nähnaht verschlossenes Ende aufweist.Bags with folded bottom usually have a box shape or cuboid shape. They offer optimum material surface utilization, good stacking capacity and, due to the cuboid shape, improved volume utilization. In addition to the box shape, there is still the quasi-box shape, which has a rectangular folded bottom on one side and an end closed by an adhesive, welding or sewing seam on the other side.
Um Kastensäcke automatisch füllen zu können, werden bei der Herstellung des Sackes an einem Boden Ventile eingearbeitet, die entweder aus einem Schlauch oder einem Blattmaterial bestehen und zwischen die Endlappen des Sackkörpers eingelegt und gegebenenfalls mitgefaltet werden. Bei dieser Ausführungsform von Kastensäcken spricht man von Kastenventilsäcken.In order to be able to fill box sacks automatically, valves are made in the manufacture of the bag on a bottom, which consist of either a hose or a sheet material and inserted between the end flaps of the bag body and optionally folded. In this embodiment of box bags one speaks of box valve bags.
Kastensäcke, Kastenventilsäcke, oder Quasi-Kastensäcke haben zumeist ein Fassungsvermögen von 10, 25 oder 50 kg, für bestimmte Anwendungen auch bis zu 1000 kg und werden zur Verpackung von Gütern, insbesondere Schüttgütern, verwendet. Kastensäcke werden heutzutage verbreitet aus Kunststofffolien oder Kunststoffgeweben hergestellt. Kunststofffolie hat keine hohe Festigkeit und benötigt deshalb eine große Materialdicke. Außerdem ist sie hitzeempfindlich und nicht formstabil wegen hohem E-Modul. Kunststoffgewebe aus monoaxial verstreckten Kunststoffbändchen weist eine hohe Festigkeit auf und ist formstabil, besonders wenn es beschichtet ist. Durch geeignete Beschichtung ist das Kunststoffgewebe auch sehr gut bedruckbar. Im Vergleich zu Kunststofffolie ist der Materialverbrauch bei Verwendung von Kunststoffgewebe bei gleicher Tragfähigkeit der Säcke wesentlich geringer. In der Praxis hervorragend bewährt haben sich Säcke aus Gewebe aus monoaxial verstreckten Polymer-, insbesondere Polyolefin-, vorzugsweise Polypropylenbändchen, das ein- oder zweiseitig mit thermoplastischem Kunststoff, insbesondere Polyolefin beschichtet sein kann. Ein solcher Sack ist aus dem Dokument
Zur Erzielung von Staub- und Feuchtigkeitsdichtheit und zur Verhinderung des Verrutschens von Bändchenlagen kann auf das Gewebe ein- oder zweiseitig eine Beschichtung aus Schmelze aus vorzugsweise demselben Material wie die Bändchen aufgetragen und eingepresst werden. Alternativ zur Schmelzebeschichtung ist auch eine Kaschierung des Gewebes mit Kunststofffolie vorgesehen.To achieve dust and moisture proofing and to prevent slippage of tape layers, a coating of melt of preferably the same material as the tapes can be applied and pressed onto the fabric on one or both sides. As an alternative to the melt coating, a lamination of the fabric with plastic film is also provided.
In jüngerer Zeit sind auch Kastensäcke aus Materialverbünden auf den Markt gekommen, wie im österreichischen Gebrauchsmuster Nr. 9643 beschrieben. Ein solcher Gewebe-Folien-Verbund weist einen Aufbau aus einem Gewebe aus monoaxial verstreckten Polymerbändchen, insbesondere Polyolefin- oder Polyesterbändchen, vorzugsweise Polypropylen- oder Polyethylenterephthalatbändchen, einer OPP-(Oriented Poly Propylen)-Folie und einer dazwischenliegenden Verbindungsschicht aus thermoplastischem Kunststoff oder Klebstoff auf. Die OPP-Folie kann auf der dem Gewebe zugewandten Oberfläche bedruckt sein. Dieser Materialaufbau zeigt sowohl hohe Festigkeit (durch das Gewebe) als auch hervorragende Bedruckbarkeit (durch die OPP-Folie). Da die OPP-Folie verstreckt ist, weist sie auch eine sehr gute Formstabilität auf. Vorteilhaft können auch BOPP-Folien verwendet werden, das sind so genannte Biaxially Oriented Poly Propylen Folien. Zur Erleichterung der Verbindung mit anderen Geweben, Gewebe-Folien-Verbunden oder Folien ist es zweckmäßig eine OPP-Folie für den Gewebe-Folien-Verbund vorzusehen, die (zumindest) auf ihrer von dem Gewebe abgewandten Oberfläche eine Foliensiegelschicht aufweist. Aus demselben Grund ist es zweckmäßig, das Gewebe des Gewebe-Folien-Verbunds ein- oder beidseitig mit einer Gewebesiegelschicht aus einem thermoplastischen Kunststoff zu beschichten. Damit bei der Herstellung des Gewebe-Folienverbundes bzw. beim Verbindungsvorgang von Sackkörper und Deckblatt, wobei mindestens eines davon aus dem Gewebe-Folien-Verbund besteht, das Gewebe nicht beschädigt wird, ist es vorteilhaft, wenn die Foliensiegelschicht und/oder die Gewebesiegelschicht einen Schmelzpunkt aufweisen, der unter dem Kristallit-Schmelzpunkt des Gewebebändchen-Materials und der OPP-Folie liegt.More recently, box sacks made of composite materials have come onto the market, as described in Austrian Utility Model No. 9643. Such a fabric / film composite has a construction of a fabric of monoaxially drawn polymer tapes, in particular polyolefin or polyester tapes, preferably polypropylene or polyethylene terephthalate tapes, an OPP (Oriented Poly Propylene) film and an intermediate connecting layer of thermoplastic or adhesive , The OPP film may be printed on the fabric facing surface. This material structure shows both high strength (through the fabric) and excellent printability (through the OPP film). Since the OPP film is stretched, it also has a very good dimensional stability. Advantageously, BOPP films can also be used, which are so-called Biaxially Oriented Poly Propylene films. To facilitate the connection with other tissues, tissue-film composites or films, it is expedient to provide an OPP film for the fabric-film composite which (at least) has a film seal layer on its surface facing away from the tissue. For the same reason, it is expedient, the fabric of the fabric-film composite on one or both sides with a fabric sealing layer of a thermoplastic To coat plastic. In order that the tissue is not damaged in the production of the tissue-film composite or in the bonding process of the sack body and cover sheet, at least one of which consists of the tissue-film composite, it is advantageous if the film seal layer and / or the tissue sealing layer has a melting point which is below the crystallite melting point of the tissue band material and the OPP film.
Somit ergeben sich für die Herstellung eines Sackes beispielsweise die folgenden Kombinationsmöglichkeiten: Sackkörper aus mehrschichtiger Folie kombiniert mit einem Deckblatt aus mehrschichtiger Folie; Sackkörper aus mehrschichtiger Folie kombiniert mit einem Deckblatt aus Folienverbund; Sackkörper aus Folienverbund kombiniert mit einem Deckblatt aus mehrschichtiger Folie; und Sackkörper aus Folienverbund kombiniert mit einem Deckblatt aus Folienverbund. Diese Ausführungsformen des Sackes bieten zwar nicht dieselbe hohe Festigkeit wie die Verwendung eines Gewebes aus monoaxial verstreckten Kunststoffbändchen, dieser Nachteil lässt sich aber durch Erhöhung der Zahl der Folienschichten mildern.Thus, for example, the following combination possibilities result for the production of a bag: bag body of multilayer film combined with a cover sheet of multilayer film; Bag body of multilayer film combined with a cover sheet of film composite; Bag body of film composite combined with a cover sheet of multilayer film; and bag body of film composite combined with a cover sheet of film composite. Although these embodiments of the bag do not offer the same high strength as the use of a fabric of monoaxially stretched plastic tapes, but this disadvantage can be mitigated by increasing the number of foil layers.
Zur Erhöhung der Tragfähigkeit des gefalteten Bodens wird auf die gefalteten Endlappen des Sackkörpers ein Deckblatt aufgebracht und flächig mit dem gefalteten Boden verbunden. Zum flächigen Verbinden des Deckblattes mit der Bodenfaltung kann beispielsweise ein Heißluft-Schweißverfahren zum Einsatz kommen, bei dem einander zugewandte beschichtete Flächen des gefalteten Bodens und des Deckblatts durch Heißluft bis zur Plastifizierung erwärmt, aneinander angepresst und anschließend gekühlt werden. Ein alternatives Verbindungsverfahren ist das flächige Verkleben des gefalteten Bodens und des Deckblattes, beispielsweise mittels Hotmelt-Kleber.To increase the carrying capacity of the folded bottom, a cover sheet is applied to the folded end tabs of the bag body and connected in a flat manner to the folded bottom. For flat connection of the cover sheet with the bottom fold, for example, a hot air welding method can be used, in which facing coated surfaces of the folded bottom and the cover sheet heated by hot air to plasticization, pressed against each other and then cooled. An alternative bonding method is the surface bonding of the folded bottom and the cover sheet, for example by means of hot melt adhesive.
Aufgrund Ihrer hohen Tragfähigkeit bei geringem Eigengewicht sind Kastensäcke aus Gewebe aus verstreckten Kunststoffbändchen auch für den Einzelhandel von Vorteil und können beispielsweise für die Verpackung von Tierfutter, etc. verwendet werden. Speziell für solche Anwendungen, prinzipiell natürlich aber auch für alle übrigen Verpackungsanwendungen, bei denen die Säcke händisch getragen werden, wäre ein Griff vorteilhaft, um das Tragen zu erleichtern. Das Anbringen des Griffes soll allerdings die Tragkraft des Sackes nicht verringern und der Griff selbst soll eine hohe Tragfähigkeit aufweisen und sich nicht vom Sack ablösen.Due to their high load-bearing capacity at low dead weight, woven fabric box bags made of stretched plastic tapes are also advantageous for the retail trade and can be used, for example, for packaging animal feed, etc. Especially for such applications, in principle, of course, but also for all other packaging applications in which the bags are carried by hand, a handle would be advantageous to facilitate carrying. However, the attachment of the handle should not reduce the carrying capacity of the bag and the handle itself should have a high load capacity and not detach from the bag.
Der Stand der Technik umfasst diverse Säcke mit Griffen unterschiedlicher Ausgestaltungsformen:
- Die Druckschrift
WO 2004/037663 A2
- The publication
WO 2004/037663 A2
Druckschrift
Das Dokument
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Lösung für das Anbringen eines Griffes an einem Sack zu bieten, wobei dadurch die Tragkraft des Sackes nicht verringert wird und der Griff selbst eine gegenüber dem Stand der Technik erhöhte Tragfähigkeit aufweist. Die Erfindung wird durch die Merkmale des Anspruchs 1 bzw. des Anspruchs 19 gelöst. Der erfindungsgemäße Sack weist hierzu die folgenden Merkmale auf:
- Der Sack besitzt einen schlauchförmigen Sackkörper, wobei der Sackkörper an zumindest einem Endbereich zu einem Boden gefaltet ist und der gefaltete Boden mit einem Deckblatt verbunden ist. Das Deckblatt weist einen durch zwei einander gegenüberliegende Innenfaltkanten begrenzten Zentralabschnitt, zwei sich lateral von den Innenfaltkanten erstreckende Zwischenabschnitte, wobei jeder Zwischenabschnitt von einer der Innenfaltkanten und einer Zwischenfaltkante begrenzt wird, und zwei sich lateral von den Zwischenfaltkanten erstreckende Außenabschnitte auf. Die Zwischenabschnitte sind an den Innenfaltkanten einwärts umgeschlagen, und die Außenabschnitte sind an den Zwischenfaltkanten auswärts umgeschlagen, wobei zumindest die Außenabschnitte mit dem gefalteten Boden verbunden sind und bei Ausführungsformen der Erfindung auch der Zentralabschnitt mit dem gefalteten Boden verbunden ist. In den Zwischenabschnitten und entweder im Zentralabschnitt oder in den Außenabschnitten sind durch Einschnitte, Perforationen oder Materialschwächung definierte Grifflöcher ausgebildet, und die Grifflöcher im Zentralabschnitt sind im gefalteten Zustand des Deckblatts im Wesentlichen bündig zu benachbarten Grifflöchern der Zwischenabschnitte angeordnet.
- The bag has a tubular bag body, wherein the bag body is folded at least one end portion to a bottom and the folded bottom is connected to a cover sheet. The topsheet has a central portion delimited by two opposing inner fold edges, two intermediate portions extending laterally from the inner fold edges, each intermediate portion bounded by one of the inner fold edges and an intermediate fold edge, and two outer portions extending laterally from the interfold edges. The intermediate sections are turned inwards at the inner folding edges, and the outer sections are folded outwards at the intermediate folding edges, wherein at least the outer sections are folded with the outer folding sections folded bottom are connected and in embodiments of the invention, the central portion is connected to the folded bottom. In the intermediate sections and either in the central section or in the outer sections, defined gripping holes are formed by cuts, perforations or material weakening, and the gripping holes in the central section are arranged in the folded state of the cover sheet substantially flush with adjacent gripping holes of the intermediate sections.
Ein Sack mit dem erfindungsgemäß angebrachten Deckblatt bietet die folgenden Vorteile:
- Das Deckblatt ist aus nur einem Stück hergestellt.
- Das Deckblatt integriert seine Grundfunktion der Abdichtung des Bodens mit einer Grifffunktion und Krafteinleitung.
- Die Krafteinleitung erfolgt durch Scherbelastung, es tritt kein Abschälen des Deckblattes vom Sackkörper auf.
- Es existieren vier Grenzflächen zum Sackkörper, wodurch die Krafteinleitung verteilt wird.
- Es stehen vier Materiallagen des Deckblatts für den Griff zur Verfügung, was zu einer enormen Reißfestigkeit und einem angenehm verteilten Gewicht für den Benutzer führt.
- Das Griffmaterial kann bedruckt werden und im ungeöffneten Zustand als "Display" dienen.
- The cover sheet is made of one piece only.
- The cover sheet integrates its basic function of sealing the floor with a handle function and force application.
- The force is introduced by shear stress, there is no peeling of the cover sheet from the bag body.
- There are four interfaces to the bag body, whereby the force is distributed.
- There are four layers of material available for the handle cover, resulting in tremendous tear resistance and a pleasantly distributed weight for the user.
- The handle material can be printed on and serve as a "display" in the unopened state.
Der erfindungsgemäße Sack kann in bestehenden oder nur geringfügig zu modifizierenden Sack-Konfektionieranlagen hergestellt werden, indem:
- ein schlauchförmiger Sackkörper bereitgestellt wird;
- ein Boden an zumindest einem offenen Ende des Sackkörpers durch Falten von Endlappen des Sackkörpers gefaltet wird;
- der gefaltete Boden mit einem Deckblatt verbunden wird, insbesondere mittels Heißluftschweißen oder Kleben;
- wobei das Deckblatt einen durch zwei einander gegenüberliegende Innenfaltkanten begrenzten Zentralabschnitt; zwei sich lateral von den Innenfaltkanten erstreckende Zwischenabschnitte, wobei jeder Zwischenabschnitt von einer der Innenfaltkanten und einer Zwischenfaltkante begrenzt wird; und zwei sich lateral von den Zwischenfaltkanten erstreckende Außenabschnitte aufweist;
- wobei vor dem Verbinden des Deckblatts mit dem gefalteten Boden die Zwischenabschnitte an den Innenfaltkanten einwärts umgeschlagen werden und die Außenabschnitte an den Zwischenfaltkanten auswärts umgeschlagen werden; und
- wobei in den Zwischenabschnitten und entweder im Zentralabschnitt oder in den Außenabschnitten durch Einschnitte, Perforationen oder Materialschwächung Grifflöcher ausgebildet werden, so dass die Grifflöcher im Zentralabschnitt oder in den Außenabschnitten im gefalteten Zustand des Deckblatts im Wesentlichen bündig zu benachbarten Grifflöchern der Zwischenabschnitte angeordnet sind.
- a tubular bag body is provided;
- a bottom is folded at at least one open end of the bag body by folding end flaps of the bag body;
- the folded bottom is connected to a cover sheet, in particular by hot air welding or gluing;
- the topsheet having a central portion bounded by two opposed inner fold edges; two intermediate portions extending laterally from the inner fold edges, each intermediate portion being bounded by one of the inner fold edges and an intermediate fold edge; and two outer portions extending laterally from the inter-fold edges;
- wherein before joining the cover sheet to the folded bottom, the intermediate portions are folded inwardly at the inner folding edges and the outer portions are folded outwardly at the intermediate folding edges; and
- wherein grip holes are formed in the intermediate sections and either in the central section or in the outer sections by cuts, perforations or material weakening, so that the grip holes in the central section or in the outer sections in the folded state of the cover sheet are arranged substantially flush with adjacent handle holes of the intermediate sections.
Bevorzugt ist das Material für das Deckblatt ein Bahnmaterial, an dem zunächst die Ausbildung der Grifflöcher erfolgt, dann die Faltungen der Zwischenabschnitte und der Außenabschnitte vorgenommen werden und schließlich mittels Querschnitten das Abschneiden der Deckblätter in einer Rapportlänge erfolgt. Die Grifflöcher werden durch Laserperforation, Laserschneiden bzw. mechanische Stanzung in der Bahn ausgebildet.Preferably, the material for the cover sheet is a web material on which initially the formation of the grip holes takes place, then the folds of the intermediate sections and the outer sections are made and finally by means of cross sections, the cutting of the cover sheets in a repeat length. The grip holes are formed by laser perforation, laser cutting or mechanical stamping in the web.
Das Deckblattmaterial kann offline vorgefertigt werden und kann dann jeder Kastenventilsackanlage ohne besondere Modifikationen zugeführt werden. Da das solcherart vorgefertigte Deckblattmaterial keine asymmetrischen Dickstellen aufweist, ist es gut auf Rollen aufwickelbar. Weiters ist es vorteilhaft, bei der Fertigung des Deckblattmaterials die Zwischenabschnitte am Zentralabschnitt zu fixieren, insbesondere nahe den Zwischenfaltkanten, oder die Zwischenabschnitte an den Außenabschnitten zu fixieren, insbesondere nahe den Innenfaltkanten, um dadurch ein Verrutschen der genannten Abschnitte zu verhindern. Dies erleichtert die automatische Sackherstellung in Konfektioniermaschinen enorm.The topsheet material can be prefabricated off-line and then fed to any box valve bag system without special modifications. Since the thus pre-made cover sheet material has no asymmetrical thick spots, it is good on rolls wound up. Furthermore, it is advantageous in the manufacture of the cover sheet material to fix the intermediate sections at the central section, in particular close to the intermediate fold edges, or to fix the intermediate sections to the outer sections, in particular close to the inner fold edges, to thereby prevent slippage of said sections. This enormously facilitates automatic bag production in packaging machines.
Ein weiterer Vorteil dieser Ausführungsform zeigt sich im Gebrauch des Sackes. Es wird nämlich das Hindurchführen der Finger durch die Grifflöcher erleichtert, wenn die Zwischenabschnitte möglichst nahe am Zentralabschnitt anliegen. Dies wird erreicht, indem die Zwischenabschnitte am Zentralabschnitt anhaften, wobei vorzugsweise die Haftstellen nahe den Zwischenfaltkanten verlaufen. Derselbe Vorteil wird in einer alternativen Ausführungsform der Erfindung erzielt, bei der die Zwischenabschnitte an den Außenabschnitten anhaften, wobei vorzugsweise die Haftstellen nahe den Innenfaltkanten verlaufen. In einer bevorzugten Ausführungsform sind die Haftstellen als Schweißnaht, Extrusionsnaht, Klebelinie oder -fläche, insbesondere aus Hotmelt-Material, oder als Nähnaht ausgebildet. Klebelinien oder -flächen können durch eine Vielzahl von einzelnen Klebepunkten angenähert werden. Ein weiterer Vorteil ist, dass das gefaltete und solcherart fixierte Deckblattmaterial keine asymmetrischen Dickstellen aufweist und daher gut auf Rollen wickelfähig ist, was die automatische Sackherstellung in Konfektioniermaschinen enorm erleichtert.Another advantage of this embodiment is evident in the use of the bag. Namely, the passage of the fingers through the grip holes is facilitated when the Intermediate sections abut as close to the central section. This is accomplished by adhering the intermediate portions to the central portion, preferably with the adhesive locations proximate the inter-fold edges. The same advantage is achieved in an alternative embodiment of the invention in which the intermediate sections adhere to the outer sections, wherein preferably the traps run close to the inner folding edges. In a preferred embodiment, the traps are formed as a weld, extrusion seam, adhesive line or surface, in particular of hotmelt material, or as a sewing seam. Gluing lines or surfaces can be approximated by a variety of individual glue dots. A further advantage is that the folded and thus fixed cover sheet material has no asymmetrical thick areas and is therefore good on reels windable, which enormously facilitates the automatic bag making in packaging machines.
Damit die die Grifflöcher aufweisenden Abschnitte des Deckblattes nicht vom Sack abstehen, was das Stapeln erschweren würde, wird weiters vorgeschlagen, dass die Zwischenabschnitte abschnittsweise, insbesondere punktförmig, lösbar an den Außenabschnitten fixiert sind. In einer alternativen Ausführungsform der Erfindung sind die Zwischenabschnitte abschnittsweise, insbesondere punktförmig, lösbar am Zentralabschnitt fixiert. In einer Fortbildung dieser alternativen Ausführungsform überlappt ein Zwischenabschnitt einen Außenabschnitt und ist abschnittsweise, insbesondere punktförmig, lösbar an dem Außenabschnitt befestigt. Bei allen Varianten kann der Benutzer des Sackes diese Fixierung leicht lösen, indem er einfach mit den Fingern durch die Grifflöcher hindurchgreift, nach oben zieht und dabei die Zwischenabschnitte und die jeweiligen Abschnitte des Zentralabschnitts oder die Außenabschnitte nach oben klappt. Es hat sich als sehr praktikabel erwiesen, wenn die abschnittsweise Fixierung der Zwischenabschnitte an den Außenabschnitten oder dem Zentralabschnitt mittels Klebestellen, insbesondere Hotmelt-Klebestellen, oder Schweißstellen erfolgt. Dabei können mehrere Fixierungsreihen vorgesehen werden.So that the gripping holes having portions of the cover sheet do not protrude from the bag, which would make the stacking difficult, it is further proposed that the intermediate sections are fixed in sections, in particular punctiform, releasably attached to the outer sections. In an alternative embodiment of the invention, the intermediate sections are fixed in sections, in particular punctiform, releasably fixed to the central portion. In a further development of this alternative embodiment, an intermediate section overlaps an outer section and is fixed in sections, in particular punctiform, releasably attached to the outer section. In all variants, the user of the bag can easily solve this fixation by simply with his fingers through the handle holes, pulls up while the intermediate sections and the respective sections of the central portion or the outer sections folds upwards. It has proven to be very practicable if the section-wise fixing of the intermediate sections on the outer sections or the central section takes place by means of splices, in particular hot-melt splices, or welds. Several fixation rows can be provided.
Grundsätzlich können Säcke der eingangs genannten Art, die mit den erfindungsgemäßen Deckblättern verschlossen wurden, aufgrund der hohen Festigkeit von gefaltetem Boden und Deckblatt nicht ohne weiters zerstörungsfrei geöffnet werden. Da die Verklebung oder Verschweißung des Deckblattes mit dem gefalteten Boden nicht ohne weiteres gelöst werden kann, werden derartige Säcke meist dadurch geöffnet, dass der Sackkörper selbst mit einem scharfen Gegenstand aufgeschlitzt wird, was aber bei Säcken aus einem Gewebe aus monoaxial verstreckten Polymerbändchen aufgrund seiner überaus hohen Festigkeit nur mit Mühe zu bewerkstelligen ist. Nach dem Aufschlitzen des Sackes besteht außerdem das Problem der schlechten Handhabbarkeit des geöffneten Sackes.Basically, bags of the type mentioned above, which were closed with the cover sheets according to the invention, due to the high strength of folded bottom and cover sheet not without further open nondestructive. Since the bonding or welding of the cover sheet with the folded bottom can not be easily solved, such sacks are usually opened by the bag body itself is slashed with a sharp object, but in bags made of a fabric of monoaxially stretched polymer ribbon due to its extremely high strength only with Effort is to accomplish. After slitting the bag, there is also the problem of poor handling of the opened bag.
Um diese Probleme zu überwinden, sieht die Erfindung in einer weiteren Ausführungsform vor, dass der Zentralabschnitt des Deckblattes zumindest eine durch Einschnitte, Perforationen oder Materialschwächung definierte Aufreißlinie aufweist, an welcher Aufreißlinie das Deckblatt ohne Hilfsmittel aufgerissen werden kann, bevorzugt, indem einfach die Griffe auseinandergezogen werden. Die Einschnitte, Perforationen oder Materialschwächung sind bevorzugt mittels Laserschneiden oder mechanischem Stanzen hergestellt.In order to overcome these problems, the invention provides in a further embodiment that the central portion of the cover sheet has at least one tear line defined by cuts, perforations or material weakening, at which tear line the cover sheet can be torn open without aids, by simply pulling the handles apart become. The cuts, perforations or material weakening are preferably produced by means of laser cutting or mechanical punching.
Wenn der Boden so gefaltet ist, dass Endlappen von einander gegenüberliegenden Wänden des Sackkörpers zueinander gefaltet sind, wobei der Endlappen der einen Wand den Endlappen der anderen Wand mit einer Überdeckungsbreite überdeckt, wird zumindest eine Aufreißlinie so angeordnet, dass sie den überdeckenden Endlappen nicht überlagert. Damit ist es für einen Benutzer einfach, nach dem Aufreißen des Deckblattes die übereinander liegenden Endlappen des Sackkörpers voneinander zu trennen und so Zugang zum Sackinneren zu erlangen.When the bottom is folded such that end flaps of opposing walls of the bag body are folded toward each other, with the end tab of one wall covering the end flaps of the other wall with a cover width, at least one tear line is arranged so as not to overlie the overlapping end flaps. Thus, it is easy for a user to separate after tearing the cover sheet, the overlapping end tabs of the bag body from each other and thus gain access to the bag interior.
Wenn der Boden so gefaltet ist, dass Endlappen von einander gegenüberliegenden Wänden des Sackkörpers zueinander gefaltet sind, wobei die Endlappen einander aber nicht überdecken, so wird bevorzugt zumindest eine Aufreißlinie so angeordnet, dass sie zwischen den beiden Endlappen verläuft. Bei dieser Konfiguration erlangt der Benutzer durch Aufreißen des Deckblattes entlang der Aufreißlinie unmittelbar Zugang zum Sackinneren.If the bottom is folded such that end flaps of opposing walls of the bag body are folded toward each other but the end flaps do not overlap one another, then preferably at least one tear line is arranged to extend between the two end flaps. In this configuration, the user gains access to the interior of the bag by tearing the topsheet along the tear line.
Um über einen möglichst großen Bereich des Sackbodens Zugang zum Sackinneren zu erlangen, kann vorgesehen werden, dass sich die zumindest eine Aufreißlinie über die gesamte Rapportlänge des Deckblattes erstreckt.In order to gain access to the interior of the bag over the largest possible area of the bag bottom, it can be provided that the at least one tear line extends over the entire repeat length of the cover sheet.
Bei manchen Anwendungen ist nur ein kleiner Zugang zum Sackinneren erwünscht, oder man möchte - bei Vorsehen mehrerer Aufreißlinien - vermeiden, dass ein Teil des Deckblattes vollständig abgerissen wird. In diesen Fällen ist es vorteilhaft, wenn sich die zumindest eine Aufreißlinie bloß über einen Teil der Rapportlänge des Deckblattes erstreckt.In some applications, only a small access to the bag interior is desired, or one would like to avoid - with the provision of several tear lines - that a part of the cover sheet is completely torn off. In these cases, it is advantageous if the at least one tear line extends only over part of the repeat length of the cover sheet.
Um das unabsichtliche Aufreißen des Deckblattes an den Aufreißlinien zu verhindern, kann die zumindest eine Aufreißlinie von einem lösbar am Deckblatt anhaftenden Schutzband abgedeckt sein. Somit muss vor dem Aufreißen des Deckblattes zunächst das Schutzband abgezogen werden. Anschließend kann die Aufreißlinie durch Auseinanderziehen der Griffe geöffnet werden. Das Schutzband dient auch dazu, den Sackinhalt vor der äußeren Umgebung zu schützen bzw. ein Auslaufen pulverigen Sackmaterials zu verhindern, wenn die Aufreißlinie als Perforation oder durch Einschnitte ausgebildet ist. Um das Schutzband zum Abziehen leichter ergreifen zu können, ist vorgesehen, dass das Schutzband ein freies Ende aufweist, das nicht am Deckblatt anhaftet. Das kann beispielsweise durch Vorsehen eines Trennmittels oder Sicherstellen, dass das Schutzband am freien Ende nicht mit einem Kleber in Berührung kommt, bewirkt werden.In order to prevent the unintentional tearing of the cover sheet on the tear lines, the at least one tear line can be covered by a releasably adhering to the cover sheet protective tape. Thus, before tearing the cover sheet first the guard band subtracted from. Subsequently, the tear line can be opened by pulling the handles apart. The protective tape also serves to protect the bag contents from the external environment or to prevent leakage of powdery bag material when the tear line is formed as a perforation or cuts. To be able to grasp the protective tape for peeling easier, it is provided that the protective tape has a free end which does not adhere to the cover sheet. This can be accomplished, for example, by providing a release agent or ensuring that the guard band does not come in contact with an adhesive at the free end.
Insbesondere zur Entnahme von Schüttgut ist es vorteilhaft, wenn das Deckblatt im aufgerissenen Zustand nicht nur eine schlitzförmige Öffnung, sondern eine Öffnung mit einer definierten Breite aufweist. Dies kann erreicht werden, indem zwei parallel zueinander verlaufende Aufreißlinien im Deckblatt vorgesehen werden, wodurch zum Öffnen ein Streifen aus dem Deckblatt herausgerissen wird. Um diesen herauszureißenden Streifen leichter ergreifen zu können, können die Aufreißlinien an einem Ende als Schnittlinien ausgebildet sein. In einer bevorzugten Ausführungsform des mit zwei Aufreißlinien im Deckblatt ausgestatteten Sackes, wobei der Boden des Sackes so gefaltet ist, dass Endlappen von einander gegenüberliegenden Wänden des Sackkörpers zueinander gefaltet sind und der Endlappen der einen Wand den Endlappen der anderen Wand mit einer Überdeckungsbreite überdeckt, ist eine im halben Abstand zwischen den beiden Aufreißlinien verlaufende Halbierungslinie um die halbe Überdeckungsbreite zu einer Mittenlinie des Sackbodens versetzt.In particular, for the removal of bulk material, it is advantageous if the cover sheet in the torn-open state not only has a slot-shaped opening, but an opening with a defined width. This can be achieved by providing two tearing lines running parallel to one another in the cover sheet, whereby a strip is torn out of the cover sheet for opening. In order to be able to grasp these strips torn out more easily, the tear-off lines can be formed at one end as cutting lines. In a preferred embodiment of the bag provided with two tear lines in the cover sheet, the bottom of the bag is folded such that end flaps of opposing walls of the bag body are folded together and the end flap of one wall covers the end flaps of the other wall with a cover width a halving line running at half the distance between the two tear lines is offset by half the overlapping width to a center line of the bottom of the bag.
Um ausreichende Festigkeit des Deckblatts am erfindungsgemäßen Sack zu erzielen, wird vorgeschlagen, das Deckblatt aus einem Material zu fertigen, das ausgewählt ist aus einem Gewebe aus Kunststoffbändchen oder einem Nonwoven-Kunststoffmaterial (zB Kunststoffvlies) oder einem Verbund aus dem Gewebe aus Kunststoffbändchen und dem Nonwoven-Kunststoffmaterial oder einer mit einer Netzstruktur verbundenen Kunststofffolie, wobei das Material optional zumindest einseitig mit zumindest einer Kunststoffschicht und/oder zumindest einer Kunststofffolie, z.B. einer OPP-Folie beschichtet ist. Das Deckblatt ist bedruckbar und kann dadurch im ungeöffneten Zustand als, "Display" dienen.In order to achieve sufficient strength of the cover sheet on the bag according to the invention, it is proposed to produce the cover sheet of a material which is selected from a fabric of plastic tape or a nonwoven plastic material (eg plastic fleece) or a composite of the fabric of plastic tape and the nonwoven Plastic material or a plastic film connected to a network structure, wherein the material optionally at least one side with at least one plastic layer and / or at least one plastic film, eg an OPP film is coated. The cover sheet is printable and can therefore serve as a "display" when unopened.
Um Sortenreinheit des Deckblatts mit dem Sackkörper und dadurch gute Recycelbarkeit des ganzen Sackes zu erreichen, ist es vorteilhaft, wenn das Deckblatt aus dem gleichen Material gefertigt ist wie der Sackkörper.In order to achieve purity of the cover sheet with the bag body and thereby good recyclability of the whole bag, it is advantageous if the cover sheet is made of the same material as the bag body.
Die Erfindung wird nun anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnungen näher erläutert.
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Fig. 1 zeigt einen erfindungsgemäßen Sack im gefalteten Zustand in Draufsicht. -
Fig. 2 zeigt das erfindungsgemäße Deckblatt im gefalteten Zustand in einer perspektivischen Ansicht. -
Fig. 3 zeigt den erfindungsgemäßen Sack im befüllten Zustand in der Perspektive. -
Fig. 4 zeigt den erfindungsgemäßen, gefüllten Sack beim Hochheben in der Perspektive. -
Fig. 5 zeigt das erfindungsgemäße Deckblatt in einer perspektivischen Teilansicht von der Stirnseite. -
Fig. 6 zeigt einen Endbereich des erfindungsgemäßen Sackes mit einem aufgebrachten Deckblatt mit Aufreißlinie und Schutzband. -
Fig. 7 zeigt eine Teilansicht eines erfindungsgemäßen Sackes mit einem aufgebrachten Deckblatt mit zwei Aufreißlinien. -
Fig. 8 zeigt einen Ausschnitt des Bodens des Sackes vonFig. 7 . -
Fig. 9 zeigt ein bahnförmiges Material zur Herstellung erfindungsgemäßer Deckblätter. -
Fig. 10 zeigt eine alternative Ausführungsform des erfindungsgemäßen Deckblatts im gefalteten Zustand in einer perspektivischen Ansicht. -
Fig. 11 zeigt eine alternative Ausführungsform des erfindungsgemäßen Deckblatts im gefalteten Zustand in einer perspektivischen Ansicht. -
Fig. 12 zeigt ein alternatives bahnförmiges Material zur Herstellung erfindungsgemäßer Deckblätter.
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Fig. 1 shows a bag according to the invention in the folded state in plan view. -
Fig. 2 shows the cover sheet according to the invention in the folded state in a perspective view. -
Fig. 3 shows the bag according to the invention in the filled state in perspective. -
Fig. 4 shows the filled bag of the invention when lifting in perspective. -
Fig. 5 shows the cover sheet according to the invention in a perspective partial view of the front side. -
Fig. 6 shows an end portion of the bag according to the invention with an applied cover sheet with tear line and protective tape. -
Fig. 7 shows a partial view of a bag according to the invention with an applied cover sheet with two tear lines. -
Fig. 8 shows a section of the bottom of the bag ofFig. 7 , -
Fig. 9 shows a sheet-like material for the production of cover sheets according to the invention. -
Fig. 10 shows an alternative embodiment of the cover sheet according to the invention in the folded state in a perspective view. -
Fig. 11 shows an alternative embodiment of the cover sheet according to the invention in the folded state in a perspective view. -
Fig. 12 shows an alternative web-shaped material for the production of cover sheets according to the invention.
Der gefaltete Boden 1d am ersten Ende des Sackkörpers 1a ist durch Heißluftschweißen oder Kleben, z.B. mit Hotmelt-Kleber, mit einem Deckblatt 10 verbunden, das nachfolgend unter Bezugnahme auf die
Wie in
Im Zentralabschnitt 10a sind durch Einschnitte, Perforationen oder Materialschwächung definierte Grifflöcher 12, 13 ausgebildet, die vorzugsweise durch Laserperforation oder -schneiden oder mechanisches Stanzen erzeugt werden. In gleicher Weise sind in den Zwischenabschnitten 10d, 10e durch Einschnitte, Perforationen oder Materialschwächung definierte Grifflöcher 14, 15 ausgebildet. Die Grifflöcher 12, 13 im Zentralabschnitt 1a sind im gefalteten Zustand des Deckblatts 10 im Wesentlichen bündig zu ihren benachbarten Grifflöchern 14, 15 der Zwischenabschnitte 10d, 10e angeordnet.In the
Die Zwischenabschnitte 10d, 10e haften am Zentralabschnitt 10a mittels Haftstellen 16, 17 an, die in diesem Ausführungsbeispiel linienförmig bzw. als langgestreckte, schmale Flächen ausgebildet sind, die nahe den Zwischenfaltkanten 10f, 10g verlaufen. Die Haftstellen 16, 17 sind als Schweißnaht, Extrusionsnaht, Klebelinie oder -fläche, insbesondere aus Hotmelt-Material, oder alternativ dazu als Nähnaht ausgebildet.The
Weiters sind die Zwischenabschnitte 10d, 10e mittels Fixierungsabschnitten 18, 19, die insbesondere punktförmig bzw. kleinflächig ausgebildet sind, lösbar an den Außenabschnitten 10h, 10j fixiert. Die Fixierungsabschnitte werden durch Klebestellen, insbesondere Hotmelt-Klebestellen, oder Schweißstellen realisiert. Dadurch stehen die die Grifflöcher 12, 13, 14, 15 aufweisenden Abschnitte des Deckblattes 10 nicht vom Sack 1 ab. Der Benutzer des Sackes 1 kann diese Fixierung leicht lösen, indem er einfach mit den Fingern durch die Grifflöcher 12, 13, 14, 15 hindurchgreift, nach oben zieht und dabei die Zwischenabschnitte 10d,10e und die jeweiligen Teile des Zentralabschnitts 10a nach oben klappt, wie in
Damit sich der Sack 1 am gefalteten Boden 1d öffnen lässt, kann das Deckblatt 10 mit zumindest einer durch Einschnitte, Perforationen oder Materialschwächung definierten Aufreißlinie 20 versehen sein.
Wie in
In den Außenabschnitten 10h, 10j sind durch Einschnitte, Perforationen oder Materialschwächung definierte Grifflöcher 12a, 13a ausgebildet, die vorzugsweise durch Laserperforation oder -schneiden oder mechanisches Stanzen erzeugt werden. In gleicher Weise sind in den Zwischenabschnitten 10d, 10e durch Einschnitte, Perforationen oder Materialschwächung definierte Grifflöcher 14, 15 ausgebildet. Die Grifflöcher 12a, 13a in den Außenabschnitten 10h, 10j sind im gefalteten Zustand des Deckblatts 10 im Wesentlichen bündig zu ihren benachbarten Grifflöchern 14, 15 der Zwischenabschnitte 10d, 10e angeordnet.In the
Die Zwischenabschnitte 10d, 10e haften an den Außenabschnitten 10h, 10j mittels Haftstellen 16a, 17a an, die in diesem Ausführungsbeispiel linienförmig bzw. als langgestreckte, schmale Flächen ausgebildet sind, die nahe den Innenfaltkanten 10b, 10c verlaufen. Die Haftstellen 16a, 17a sind als Schweißnaht, Extrusionsnaht, Klebelinie oder -fläche, insbesondere aus Hotmelt-Material, oder alternativ dazu als Nähnaht ausgebildet.The
Weiters sind die Zwischenabschnitte 10d, 10e mittels Fixierungsabschnitten 18a, 19a, die insbesondere punktförmig bzw. kleinflächig ausgebildet sind, lösbar am Zentralabschnitt 10a fixiert. Die Fixierungsabschnitte 18a, 19a werden durch Klebestellen, insbesondere Hotmelt-Klebestellen, oder Schweißstellen realisiert. Dadurch stehen die die Grifflöcher 12a, 13a, 14, 15 aufweisenden Abschnitte des Deckblattes 10 nicht vom Sack 1 ab. Der Benutzer des Sackes 1 kann diese Fixierung leicht lösen, indem er einfach mit den Fingern durch die Grifflöcher 12a, 13a, 14, 15 hindurchgreift, nach oben zieht und dabei die Zwischenabschnitte 10d, 10e und die jeweiligen Teile der Außenabschnitte 10h, 10j nach oben klappt. Dabei ergreift der Benutzer vier Deckblattlagen, so dass aufgrund der gleichmäßigen Kraftverteilung beim Hochheben die Grifflöcher nicht ausreißen. Beim Hochheben des Sackes 1 mittels der Grifflöcher 12a, 13a, 14, 15 bildet der Sack 1 am gefalteten Boden 1d eine zulaufende, in Seitenansicht gesehen "spitze" Form aus, weshalb die Verbindung zwischen dem Deckblatt 10 und dem Sackkörper 1a nur einer Scherbelastung unterliegt, aber keiner Schälbelastung. Schälbelastungen würden zu einem Ablösen des Deckblattes bei relativ geringen Kräften führen und sind daher unerwünscht.Furthermore, the
Claims (21)
- A bag (1), in particular a box bag or a box valve bag, comprising a tubular bag body (1a), wherein the bag body is folded into a bottom (1d, 1e) at least at one end region and the folded bottom (1d, 1e) is connected to a cover sheet (10, 11), wherein the cover sheet (10) comprises a central section (10a) delimited by two interior folding edges (10b, 10c) located opposite to each other; and two outer sections (10h, 10j); wherein optionally in addition the central section (10a) is connected to the folded bottom (1d), wherein in the central section (10a) or in the outer sections (10h, 10j), grip holes (12, 13, 12a, 13a) defined by incisions, perforations or a weakening in the material are formed, characterized in that the bag (1) comprises two intermediate sections (10d, 10e) extending laterally from the interior folding edges (10b, 10c), wherein each intermediate section (10d, 10e) is delimited by one of the interior folding edges (10b, 10c) and an intermediate folding edge (10f, 10g); wherein the outer sections (10h, 10j) extend laterally from the intermediate folding edges (10f, 10g); wherein the intermediate sections (10d, 10e) are turned inwards on the interior folding edges (10b, 10c), and the outer sections (10h, 10j) are turned outwards on the intermediate folding edges (10f, 10g), wherein at least the outer sections (10h, 10j), are connected to the folded bottom (1d), wherein, in the intermediate sections (10d, 10e) grip holes (14, 15) defined by incisions, perforations or a weakening in the material are formed, and, in the folded condition of the cover sheet (10), the grip holes (12, 13, 12a, 13a) in the central section (10a) or in the outer sections (10h, 10j) are arranged essentially flush with adjacent grip holes (14, 15) of the intermediate sections (10d, 10e).
- A bag according to claim 1, characterized in that the intermediate sections (10d, 10e) adhere to the central section (10a), with the adhesive spots (16, 17) preferably extending in close proximity to the intermediate folding edges (10f, 10g) or that the intermediate sections (10d, 10e) adhere to the outer sections (10h, 10j), with the adhesive spots (16a, 17a) preferably extending in close proximity to the interior folding edges (10b, 10c).
- A bag according to claim 2, characterized in that the adhesive spots (16, 17, 16a, 17a) are designed as a welded seam, an extrusion seam, a pasted line or area, in particular of a hot-melt material, or as a sewn seam.
- A bag according to any of the preceding claims, characterized in that the intermediate sections (10d, 10e) are detachably fastened (18, 19) to the outer sections (10h, 10j) in a sectional, particularly punctiform manner, or that the intermediate sections (10d, 10e) are detachably fastened (18a, 19a) to the central section (10a) in a sectional, particularly punctiform manner.
- A bag according to any of claims 1 to 3, characterized in that an intermediate section (10d, 10e) overlaps an outer section (10j, 10h) and is detachably fastened (18, 19) to the outer section (10j, 10h) in a sectional, particularly punctiform manner.
- A bag according to claim 4 or 5, characterized in that the sectional fixation (18, 19) of the intermediate sections to the outer sections is effected via adhesive joints, in particular hot-melt adhesive joints, or welded joints.
- A bag according to any of the preceding claims, characterized in that the central section (10a) comprises at least one tear line (20, 21) defined by incisions, perforations or a weakening in the material.
- A bag according to claim 7, characterized in that the bottom (1d, 1e) is folded such that end flaps (1f, 1g) are folded toward each other from walls (1b, 1c) of the bag body (1a) located opposite to each other, with the end flap (1g) of one wall (1c) covering the end flap (1f) of the other wall (1b) with an overlap width (x), and at least one tear line (20, 21) does not overlay the covered end flap (1g).
- A bag according to claim 7, characterized in that the bottom (1d, 1e) is folded such that end flaps (1f, 1g) are folded toward each other from walls (1b, 1c) of the bag body (1a) located opposite to each other, with the end flaps (1f, 1g) not covering each other, and at least one tear line (20, 21) extends between the two end flaps (1f, 1g).
- A bag according to any of claims 7 to 9, characterized in that the at least one tear line (20, 21) extends across the entire repeat length (L) of the cover sheet (10).
- A bag according to any of claims 7 to 9, characterized in that the at least one tear line (20, 21) extends merely over part of the repeat length (L) of the cover sheet (10).
- A bag according to any of claims 7 to 11, characterized in that the at least one tear line (20, 21) is covered by a protective band (22) detachably adherent to the cover sheet.
- A bag according to claim 12, characterized in that the protective band (22) has a free end (22a) which does not adhere to the cover sheet (10).
- A bag according to any of claims 7 to 13, characterized in that two tear lines (20, 21) extending parallel to each other are provided.
- A bag according to claim 14, characterized in that the tear lines (20, 21) are designed on one of their ends as cutting lines (20a, 21a).
- A bag according to claim 14 or 15, characterized in that the bottom (1d, 1e) is folded such that end flaps (1f, 1g) are folded toward each other from walls (1b, 1c) of the bag body (1a) located opposite to each other, with the end flap (1g) of one wall (1c) covering the end flap (1f) of the other wall (1b) with an overlap width (x), characterized in that a bisector (h) extending at half a distance (y) between the two tear lines (20, 21) is offset by half the overlap width (x) toward a centre line (m) of the bag bottom.
- A bag according to any of the preceding claims, characterized in that the cover sheet (10) is manufactured from a material selected from a fabric made of small plastic bands or a nonwoven synthetic material (e.g. a synthetic spun bond material) or a compound of the fabric made of small plastic bands and the nonwoven synthetic material or a plastic film connected to a network structure, the material optionally being coated with at least one synthetic layer and/or at least one plastic film, e.g., an OPP film, at least on one side.
- A bag according to any of the preceding claims, characterized in that the cover sheet (10) is produced from the same material as the bag body (1a).
- A process for the production of a bag (1), comprising:providing a tubular bag body (1a),folding a bottom (1d, 1e) at least at one open end of the bag body (1a) by folding end flaps (1f, 1g) of the bag body,connecting the folded bottom (1d, 1e) to a cover sheet (10), in particular by means of hot-air welding or gluing;characterized in that:the cover sheet (10) comprises a central section (10a) delimited by two interior folding edges (10b, 10c) located opposite to each other; two intermediate sections (10d, 10e) extending laterally from the interior folding edges (10b, 10c), wherein each intermediate section (10d, 10e) is delimited by one of the interior folding edges (10b, 10c) and an intermediate folding edge (10f, 10g); and two outer sections (10h, 10j) extending laterally from the intermediate folding edges (10f, 10g);wherein, prior to connecting the cover sheet (10) to the folded bottom (1d, 1e), the intermediate sections (10d, 10e) are turned inwards on the interior folding edges (10b, 10c) and the outer sections (10h, 10j) are turned outwards on the intermediate folding edges (10f, 10g), wherein, in the intermediate sections (10d, 10e) and either in the central section (10a) or in the outer sections (10h, 10j), grip holes (14, 14; 12, 13; 12a, 13a) are formed by incisions, perforations or a weakening in the material so that, in the folded condition of the cover sheet (10), the grip holes (12, 13; 12a, 13a) in the central section (10a) or in the outer sections (10h, 10j) are arranged essentially flush with adjacent grip holes (14, 15) of the intermediate sections (10d, 10e).
- A process according to claim 19, characterized in that the material of the cover sheet (10) is a web material (30) on which, initially, the formation of the grip holes (12, 13, 12a, 13a, 14, 15) is carried out, then the foldings of the intermediate sections (10d, 10e) and of the outer sections (10h, 10j) are performed and, finally, the cover sheets (10) are cut off at a repeat length (L) via transverse sections (31), wherein the web material (30) preferably is wound onto a roll after folding, and is unwound from the roll for being cut at the repeat length.
- A process according to claim 19 or 20, characterized in that the intermediate sections (10d, 10e) are connected to the central section (10a) via adhesive spots (16, 17) or that the intermediate sections (10d, 10e) are connected to the outer sections (10h, 10j), the adhesive spots (16, 17, 16a, 17a) preferably being designed as a welded seam, an extrusion seam, a pasted line or area, in particular of a hot-melt material, or as a sewn seam.
Priority Applications (1)
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EP14771926.4A EP3052395B1 (en) | 2013-10-04 | 2014-09-24 | Sack and sack manufacturing method |
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PCT/EP2014/070361 WO2015049139A1 (en) | 2013-10-04 | 2014-09-24 | Bag and bag-production method |
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BR102016014915B1 (en) * | 2016-06-23 | 2019-06-11 | Starlinger & Co Gesellschaft Mbh | PACKAGING TYPE BAG OR CATERPILLAR |
WO2018229598A1 (en) * | 2017-06-11 | 2018-12-20 | Siddharth LOHIA | Gripping element for block-bottom bag and method of providing thereof |
CN110227877A (en) * | 2019-02-13 | 2019-09-13 | 中山市海迪威电器有限公司 | Sealed stainless steel container welding process for liquid storage |
CN113650275A (en) * | 2021-07-28 | 2021-11-16 | 佛山市弘禾新材料科技有限公司 | Preparation device and preparation method of antibacterial waterproof fresh-keeping bag |
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FI45539C (en) * | 1967-01-24 | 1972-07-10 | Suominen Heikki S | Plastic bag with bracket or hanger. |
GB1419651A (en) * | 1973-01-09 | 1975-12-31 | Sengewald K H | Method for manufacturing carrier bags |
WO2004037663A2 (en) * | 2002-10-24 | 2004-05-06 | Lionel Nicholas Mantzivis | Bag with handle |
US20110158560A1 (en) * | 2009-12-29 | 2011-06-30 | Sca Hygiene Products Ab | Internal strap handle bag |
WO2012103560A1 (en) * | 2011-02-03 | 2012-08-09 | Herwig Worff | Bag |
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AR097912A1 (en) | 2016-04-20 |
ES2645430T3 (en) | 2017-12-05 |
RU2016111937A (en) | 2017-11-13 |
BR112016006425B1 (en) | 2022-04-19 |
WO2015049139A1 (en) | 2015-04-09 |
CN105636873B (en) | 2018-06-22 |
PH12016500540B1 (en) | 2016-06-13 |
CN105636873A (en) | 2016-06-01 |
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