EP0126816A1 - Bags, particularly multiwall bags - Google Patents
Bags, particularly multiwall bags Download PDFInfo
- Publication number
- EP0126816A1 EP0126816A1 EP83303018A EP83303018A EP0126816A1 EP 0126816 A1 EP0126816 A1 EP 0126816A1 EP 83303018 A EP83303018 A EP 83303018A EP 83303018 A EP83303018 A EP 83303018A EP 0126816 A1 EP0126816 A1 EP 0126816A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bag
- channel
- ply
- tube
- strip
- 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.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/01—Ventilation or drainage of 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
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/04—Bags or like containers made of paper and having structural provision for thickness of contents with multiple walls
Definitions
- Bags of this type of construction contain a plurality of plies of flexible sheet material, such as paper, laminated to one another in superimposed relation which are formed into a tube having gusseted side-walls interposed between front and back walls, one of which overlaps the other at each bag end.
- One overlapping end in the bag is folded over and sealed against the opposite wall to provide an open ended bag ready for filling, usually with a bulk, granular or powdery material, whereupon the opposite overlapping end is similarly folded over and sealed against the opposite wall thereby to completely seal the packaged material within the bag enclosure.
- the innermost ply was sometimes provided with a moisture impervious plastic coating or an innermost ply of plastic material which was permanently laminated to the innermost paper ply.
- an innermost bag ply of a heat sealable plastic material which is loosely adhered to a contiguous paper ply for manual detachment therefrom and which is heat sealed transversely of the bag at the closed end, the bag closure at said end being otherwise completed by folding over an overlapping wall portion of the outermost plies and sealing against the opposite wall.
- the opposite end of the plastic ply is closed by heat sealing prior to folding over and sealing the overlapping wall portions of the outermost plies at said end.
- the plastic ply is of such length as not to be included in the sealed bag end closures provided by the outermost plies.
- the bag may thus be opened in the outermost plies leaving intact the plastic ply and therein packaged contents. And since the plastic ply is only lightly adhered to the contiguous ply, the outer plies may be torn or.cut away and peeled off of the plastic ply without rupture thereof for removal of a thus completely sealed and impervious plastic ply container of the packaged material. For removal of the packaged contents without contamination, the exterior of this plastic container may be sterilized and the container slit and its contents discharged under wholly sterile conditions in a sterile atmosphere. Examples of such multiwall bag constructions are completely illustrated and described in U.S. Patent Nos. 3,807,626,; 3,910,488; and 4,088,264; whose disclosures are all incorporated herein by reference.
- U.S. Patent No. 3,302,859 which relates to a bag having a longitudinal seam with overlapping margins secured together throughout their length, and where one of the margins has a series of vents therein to allow air to escape from the bag.
- the embodiments disclosed in this patent have no means for preventing material in the bag from entering the space between the overlapping margins and, vice-versa, to prevent contaminants from entering the bag from its external environment, through the air vents. Further, no means are provided to prevent the walls which form the space between the margins from becoming permanently closed together when the margins are being secured at their edges, e.g. by heat sealing.
- a preferred embodiment of this invention described hereinbelow provides such a means. of deaeration.
- air is allowed to escape along a longitudinal seam formed during the production of an inner plastic pouch.
- a spacer of paper or filter-type material such as filter cord is positioned along the length of the pouch between overlapped portions of the plastic pouch forming the seam. Holes are punched or die cut in the seam area material on the inside of the seam, that is, on the side of the seam facing a product,and two longitudinal beads of adhesive are used to join the pouch material to form the seam, the adhesive being positioned on opposite sides of the spacer.
- Air could then travel in the channel along the film overlap between the two beads of adhesives and either out another set of holes in the top portion of the overlap, or the area away from the product, or alternatively, through a heat seal closure which is rendered noncontinuous in that area because of the filter material or paper vent strip incorporated into the seam seal.
- the bag B shown therein consists essentially of front and rear walls 16 and 17, respectively, each of which includes an innermost ply 10 of a heat sealable thermoplastic material, and three outer plies 11-13 inc., made preferably of heavy kraft paper, although other suitable flexible sheet stock may be employed.
- the bag is gusseted along oppositely disposed side-walls, as at 14, 15, on opposite sides of relatively wide front and rear walls 16, 17.
- the bag B as manufactured is initially open at the top and closed at the bottom with a pinch bottom closure as at 18, described in detail hereinafter.
- the paper plies 11-13 inc. of each wall are securely laminated to one another at the top and base of the bag, while the plastic ply 10 is only lightly adhered to the contiguous paper ply 11 at the top and base of the bag as at 19 and 20.
- the plastic and contiguous paper plies 10, 11 respectively are substantially flush cut in the front and rear walls and in the gussets, and the outer plies 12, 13, are substantially flush cut coincident therewith in the gussets.
- the outer plies 12, 13 are stepped successively downward in the front wall 16 with respect to plies 10, 11, as shown at 21, 22, and are stepped successively upward with respect thereto in the back wall 17, as at 23, 24.
- the outer plies 12, 13, extend beyond or overlap all plies in the gusset and front wall portions of the bag at the open top end, and thus may be folded over and sealed at spaced spots against the corresponding plies in the front wall or on the outermost ply 13 thereof, for which purpose the overlap area is coated with a thermoplastic adhesive, at spaced spots, as at 25, once the bag B is filled. This leaves the bag open to the atmosphere at spaced locations along the seal for the transmission of air from the interior of the bag B as will be made clear hereinafter.
- the outer plies 12, 13 are correspondingly stepped with respect to the, inner plies 10, 11 except in the reverse order as between the back and front walls.
- Closure at the base of the bag to provide the pinch bottom closure 18 is accomplished in two steps.
- the first step consists in applying heat and pressure between the opposite walls of the blank at the lower end, as by means of hot compression rolls or bars. This heat seals the oppositely disposed wall portions of the thermoplastic ply to each'other to provide a sealed closure of the ply at the bottom of the bag.
- a thermoplastic adhesive is then applied to the stepped portions of plies 12, 13 as at 35, 36 and the overlapping portions 27, 28 of the outer plies 12, 13 are folded over against the opposite wall of the bag as shown in FIG.
- a rip cord or tear string 40 is interposed as shown in FIG. 2, between Ply 11 of front wall i6 and ply 13 of rear wall 17, upon folding over and completing the bag closure in the manner above described.
- Air has a tendency to be entrapped within the product bulk packaged in the thermoplastic ply 10 or the bag pouch such as non-fat dry milk during filling of the ply, or air can be entrapped in the area of the ply above the product at the time the plastic ply is sealed.
- any entrapped air in the ply would be pushed against the interior sides thereof, possibly rupturing the seal on the ply and causing contamination of the ply contents.
- Air is allowed to escape along a longitudinal seam 50 formed during the production of the inner ply 10.
- a spacer of paper 52 or filter-type material such as filter cord is positioned along the length of the ply 10 between the overlapped portions 54 and 56 of the plastic ply 10 forming the seam 50.
- Holes 58 are punched or die cut in the same area material on the inside portion 54 of the seam 50, that is, on the side of the seam 50 facing the product and two longitudinal beads of adhesive 60, 62 are used to join the ply portions 54, 56 to form the seam 50;the adhesive being positioned on.opposite sides of the paper spacer 52, which can be joined to the outer ply portion 56 by a line of adhesive 64.
- Air could then travel in the channel 66 along the overlap portions 54, 56 between the two beads of adhesives 62 and 60, through the heat seal closure along the width of ply 10, which is rendered noncontinuous in the area of seam 50 because of the paper vent strip or filter material 52 incorporated into the same seal, and discharged to the atmosphere by way of the spaces between spots 25 of adhesive connecting ply 13 of front wall 16 to ply 12 of rear wall 17.
- the air trapped within ply 10 can be transmitted from the channel 66 out a second set of holes 68 in the overlapped seam ply portion 56 to the atmosphere by way of the spaces between adhesive spots 25, the holes 68 being offset and not in registration with holes 58 in ply portion 54 to reduce the possibility of contamination of the bulk material in ply 10.
- a paper vent strip or a strip of a filtering medium as a spacer 52 substantially precludes material in the ply 10 from entering the seam channel 66 and vice-versa, from contaminants entering the ply 10 through openings 58.
- the strip 52 also avoids blockage of channel 66 by preventing opposed portions 54, 56 of the plastic seam 50 from adhereing to each other during heat sealing of the seam.
- vent strip 52 is applied to a plastic pouch inside of a multi-wall paper bag, it will be understood that the invention has application to a plastic pouch standing alone.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bag Frames (AREA)
Abstract
A multiwall bag having an interior plastic pouch (10) formed from a sealed plastic tube having a longitudinal seam (50) comprising overlapping tube margins (54, 56) sealed together by two spaced seals (60, 62) to provide a channel (66), one of the tube margins being formed with openings (58) providing communication between the interior of the tube and the channel to permit escape of air from the tube. A strip of materials (52) is disposed along the length of the channel to prevent the overlapping tube margins (54, 56) from adhering to each other between the spaced seals (60, 62).
Description
- Bags of this type of construction contain a plurality of plies of flexible sheet material, such as paper, laminated to one another in superimposed relation which are formed into a tube having gusseted side-walls interposed between front and back walls, one of which overlaps the other at each bag end. One overlapping end in the bag is folded over and sealed against the opposite wall to provide an open ended bag ready for filling, usually with a bulk, granular or powdery material, whereupon the opposite overlapping end is similarly folded over and sealed against the opposite wall thereby to completely seal the packaged material within the bag enclosure. Also, in such bags as heretofore produced, the innermost ply was sometimes provided with a moisture impervious plastic coating or an innermost ply of plastic material which was permanently laminated to the innermost paper ply.
- All such conventional bag constructions were objectionable for the packaging of comestibles, such as dry powdered milk, eggs or the like, in that during handling and shipment the bag exteriors become highly contaminated with dust, bacteria and other contaminating substances, to the extent that it becomes extremely difficult, if not impossible to prevent contamination of the packaged material when the bag is opened to discharge the contents.
- In an effort to prevent such contamination, it has become common practice to manually insert into an open ended paper bag a separate plastic pouch, and then after the pouch within the bag is filled, the pouch itself is manually tied closed at its open end and pushed down into the bag so that it does not interfere with closure of the bag itself, usually accomplished by sewing the closure. This practice is objectionable in that it requires that the bag and pouch components be separately produced and the components manually assembled,' which is unduly expensive. Also the manual tying of the pouch when filled and subsequent closure of the bag proper retards the closure operations. In addition, the manual handling of the plastic pouch in the bag and pouch assembly and tying operations as well as the subsequent untying to discharge the contents, are sources of potential contamination.
- Accordingly, in order to eliminate these highly objectionable features, it has been proposed to provide an innermost bag ply of a heat sealable plastic material, which is loosely adhered to a contiguous paper ply for manual detachment therefrom and which is heat sealed transversely of the bag at the closed end, the bag closure at said end being otherwise completed by folding over an overlapping wall portion of the outermost plies and sealing against the opposite wall. Also when the bag is filled with a comestible or the like, the opposite end of the plastic ply is closed by heat sealing prior to folding over and sealing the overlapping wall portions of the outermost plies at said end. The plastic ply is of such length as not to be included in the sealed bag end closures provided by the outermost plies. The bag may thus be opened in the outermost plies leaving intact the plastic ply and therein packaged contents. And since the plastic ply is only lightly adhered to the contiguous ply, the outer plies may be torn or.cut away and peeled off of the plastic ply without rupture thereof for removal of a thus completely sealed and impervious plastic ply container of the packaged material. For removal of the packaged contents without contamination, the exterior of this plastic container may be sterilized and the container slit and its contents discharged under wholly sterile conditions in a sterile atmosphere. Examples of such multiwall bag constructions are completely illustrated and described in U.S. Patent Nos. 3,807,626,; 3,910,488; and 4,088,264; whose disclosures are all incorporated herein by reference.
- One further problem that has been encountered with bags of this type is that air can be entrapped within the product bulk package in the bag pouch such as non-fat dry milk, or air can be entrapped in the area of the pouch above the product at the time the plastic pouch is sealed. Upon stacking of the bags, any entrapped air in the pouch would be pushed against the interior sides of the pouch, rupturing the seal on the pouch and causing contamination of the pouch contents.
- One solution to this problem is disclosed in U.S. Patent No. 3,302,859, which relates to a bag having a longitudinal seam with overlapping margins secured together throughout their length, and where one of the margins has a series of vents therein to allow air to escape from the bag. The embodiments disclosed in this patent, however, have no means for preventing material in the bag from entering the space between the overlapping margins and, vice-versa, to prevent contaminants from entering the bag from its external environment, through the air vents. Further, no means are provided to prevent the walls which form the space between the margins from becoming permanently closed together when the margins are being secured at their edges, e.g. by heat sealing.
- Accordingly, to allow proper stackability and to prevent rupture of the pouch seal, as much air as practicable should be allowed to freely escape from the pouch and bag, without loss of the pouch contents and without exposure of the pouch contents to contamination. A preferred embodiment of this invention described hereinbelow provides such a means. of deaeration.
- The invention is defined in the claims.
- In a preferred embodiment of the invention described hereinbelow, air is allowed to escape along a longitudinal seam formed during the production of an inner plastic pouch. A spacer of paper or filter-type material such as filter cord is positioned along the length of the pouch between overlapped portions of the plastic pouch forming the seam. Holes are punched or die cut in the seam area material on the inside of the seam, that is, on the side of the seam facing a product,and two longitudinal beads of adhesive are used to join the pouch material to form the seam, the adhesive being positioned on opposite sides of the spacer. Air could then travel in the channel along the film overlap between the two beads of adhesives and either out another set of holes in the top portion of the overlap, or the area away from the product, or alternatively, through a heat seal closure which is rendered noncontinuous in that area because of the filter material or paper vent strip incorporated into the seam seal.
- The invention will now be further described, by way of illustrative and non-limiting example, with reference to the accompanying drawings, wherein: ..
- FIGURE 1 is a perspective view of a multiwall bag embodying thepresent invention;
- FIGURE 2 is a longitudinal cross-sectional view of the bag of FIGURE 1, taken substantially along the plane indicated by line 2-2 of FIGURE 1;
- FIGURE 3 is a cross-sectional view taken substantially along the plane indicated by line 3-3 of FIGURE 2;
- FIGURE 4 is a partial perspective view, with portions broken away for purposes of illustration, of the seam area of the inner pouch bag contained within the multiwall bag of FIGURE 1;
- FIGURE 5 is a perspective view of an alternative embodiment of a multiwall bag constructed in accordance with the present invention;
- FIGURE 6 is a cross-sectional view of the bag of FIGURE 5 taken substantially along the plane indicated by line 6-6 of FIGURE 5;
- FIGURE 7 is a cross-sectional view taken substantially along the plane indicated by line 7-7 of FIGURE 6.
- Referring now to the drawings in detail, wherein like numerals indicate like elements throughout the several views, the bag B shown therein consists essentially of front and
rear walls innermost ply 10 of a heat sealable thermoplastic material, and three outer plies 11-13 inc., made preferably of heavy kraft paper, although other suitable flexible sheet stock may be employed. The bag is gusseted along oppositely disposed side-walls, as at 14, 15, on opposite sides of relatively wide front andrear walls - The bag B as manufactured, is initially open at the top and closed at the bottom with a pinch bottom closure as at 18, described in detail hereinafter. The paper plies 11-13 inc. of each wall are securely laminated to one another at the top and base of the bag, while the
plastic ply 10 is only lightly adhered to thecontiguous paper ply 11 at the top and base of the bag as at 19 and 20. - As best shown in FIG. 2, the plastic and
contiguous paper plies outer plies outer plies front wall 16 with respect toplies back wall 17, as at 23, 24. In the back wall, therefore, theouter plies outermost ply 13 thereof, for which purpose the overlap area is coated with a thermoplastic adhesive, at spaced spots, as at 25, once the bag B is filled. This leaves the bag open to the atmosphere at spaced locations along the seal for the transmission of air from the interior of the bag B as will be made clear hereinafter. - At the bottom of the bag, the
outer plies inner plies pinch bottom closure 18 is accomplished in two steps. The first step consists in applying heat and pressure between the opposite walls of the blank at the lower end, as by means of hot compression rolls or bars. This heat seals the oppositely disposed wall portions of the thermoplastic ply to each'other to provide a sealed closure of the ply at the bottom of the bag. A thermoplastic adhesive is then applied to the stepped portions ofplies portions 27, 28 of theouter plies outer bag plies thermoplastic ply 10, as at 39, so that if the bag is subsequently opened at the bottom by slitting only theouter plies - In order to assure opening the bag in this manner, a rip cord or
tear string 40, is interposed as shown in FIG. 2, betweenPly 11 of front wall i6 andply 13 ofrear wall 17, upon folding over and completing the bag closure in the manner above described. - Air has a tendency to be entrapped within the product bulk packaged in the
thermoplastic ply 10 or the bag pouch such as non-fat dry milk during filling of the ply, or air can be entrapped in the area of the ply above the product at the time the plastic ply is sealed. Upon stacking of the bags B, any entrapped air in the ply would be pushed against the interior sides thereof, possibly rupturing the seal on the ply and causing contamination of the ply contents. - Air is allowed to escape along a
longitudinal seam 50 formed during the production of theinner ply 10. A spacer ofpaper 52 or filter-type material such as filter cord is positioned along the length of theply 10 between the overlappedportions plastic ply 10 forming theseam 50.Holes 58 are punched or die cut in the same area material on theinside portion 54 of theseam 50, that is, on the side of theseam 50 facing the product and two longitudinal beads of adhesive 60, 62 are used to join theply portions seam 50;the adhesive being positioned on.opposite sides of thepaper spacer 52, which can be joined to theouter ply portion 56 by a line ofadhesive 64. Air could then travel in thechannel 66 along theoverlap portions adhesives ply 10, which is rendered noncontinuous in the area ofseam 50 because of the paper vent strip orfilter material 52 incorporated into the same seal, and discharged to the atmosphere by way of the spaces betweenspots 25 of adhesive connectingply 13 offront wall 16 toply 12 ofrear wall 17. - Alternatively, as shown in bag B' (FIGURES 5 to 7), wherein the identical numerals are used to indicate the identical elements utilized in bag B (FIGURES 1 to 4), the air trapped within
ply 10 can be transmitted from thechannel 66 out a second set ofholes 68 in the overlappedseam ply portion 56 to the atmosphere by way of the spaces betweenadhesive spots 25, theholes 68 being offset and not in registration withholes 58 inply portion 54 to reduce the possibility of contamination of the bulk material inply 10. - In any event, the use of a paper vent strip or a strip of a filtering medium as a
spacer 52 substantially precludes material in theply 10 from entering theseam channel 66 and vice-versa, from contaminants entering theply 10 throughopenings 58. Thestrip 52 also avoids blockage ofchannel 66 by preventingopposed portions plastic seam 50 from adhereing to each other during heat sealing of the seam. - While in the preferred embodiment of the invention described above the
vent strip 52 is applied to a plastic pouch inside of a multi-wall paper bag, it will be understood that the invention has application to a plastic pouch standing alone.
Claims (14)
1. A bag formed from a sealed plastic tube having a longitudinal seam comprising overlapping tube margins sealed together by two spaced seals to provide a channel, one of the tube margins being formed with openings providing communication between the interior of the tube and the channel to permit escape of air from the tube, and a strip of material disposed along the length of the channel to prevent the overlapping tube margins from adhering to each other between the spaced seals.
2. A multiwall bag of tubular form, adapted to be sealed at opposite ends thereof, comprising
opposed walls including
a plurality of contiguous outer plies of paper and an innermost ply of heat sealable plastic material,
said plastic ply being transversely heat sealed to form a closure over a zone adjacent each of said opposite ends, and
said plastic ply having deaeration means for allowing trapped air within said sealed plastic ply to escape from the interior thereof to relieve pressure on said plastic ply closures, said deaeration means including
a longitudinal seam formed by overlapping spaced side edges of said plastic ply joined along spaced lines providing an unsecured channel portion therebetween through which air is adapted to be conveyed from the interior of said sealed plastic ply,
a plurality of openings in the innermost, overlapped side edge of said plastic ply forming said seam for providing communication between the interior of said sealed plastic ply and said channel, and
means disposed in said channel for inhibiting commodity material housed within said sealed plastic ply of said bag from entering said channel and the opposed portions of said overlapped end edges of said ply forming said channel from adhering to each other.
3. A multiwall bag in accordance with Claim 2 wherein said prevention means includes
a paper strip disposed in said channel between said spaced lines of joinder.
4. A multiwall bag in accordance with Claim 2 wherein said inhibiting means includes
a strip of a filtering medium disposed in said channel between said spaced lines of joinder.
5. A multiwall bag in accordance with Claim 2 including
a second set of a plurality of openings extending through the outermost, overlapped end side of said plastic ply forming said seam and the contiguous paper plies in one of said opposed walls in communication with said channel.
6. A multiwall bag in accordance with Claim 2 wherein said inhibiting means extends across at least one of said transversely heat sealed zones forming a closure at one end of said plastic ply.
7. A multiwall bag in accordance with Claims 3 or 4 wherein said strip and channel extends across at least one of said transversely heat sealed zones forming a closure at one end of said plastic ply.
8. A muliwall bag in accordance with Claim 5 wherein said inhibiting means includes
a paper strip disposed in said channel between said spaced lines of joinder.
9. A multiwall bag in accordance with Claim 5 wherein said inhibiting means includes
a strip of filtering medium disposed in said channel between said spaced lines of joinder.
10. A multiwall bag in accordance with Claim 2 wherein said lines of joinder are formed by lines of an adhesive.
11. A multiwall bag in accordance with Claim 3 or 4 wherein said strip is secured to the outermost, overlapped side of said plastic ply,
12. A multiwall bag in accordance with Claim 8 wherein said lines of joinder are formed by lines of an adhesive.
13. A multiwall bag in accordance with Claim 8 or 9 wherein said strip is secured to the outermost, overlapped side edge of said plastic ply.
14. The method of making a vented bag from a web of plastic material comprising forming a series of vents in one side margin of the web, placing a strip of material along the length of the other side margin of the web, forming the web into a tube by bringing the side margins into overlapping relation and sealing them together by two spaced seals on opposite sides of the vents and the strip of material to provide a channel communicating with the interior of the bag by way of the vents to permit escape of air from the tube, the strip of material preventing the overlapping tube margins from adhering to each other between the spaced seals, and sealing one end of the tube.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP83303018A EP0126816A1 (en) | 1983-05-25 | 1983-05-25 | Bags, particularly multiwall bags |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP83303018A EP0126816A1 (en) | 1983-05-25 | 1983-05-25 | Bags, particularly multiwall bags |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0126816A1 true EP0126816A1 (en) | 1984-12-05 |
Family
ID=8191169
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83303018A Withdrawn EP0126816A1 (en) | 1983-05-25 | 1983-05-25 | Bags, particularly multiwall bags |
Country Status (1)
Country | Link |
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EP (1) | EP0126816A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9002330U1 (en) * | 1990-02-28 | 1990-05-03 | Bischof Und Klein Gmbh & Co, 4540 Lengerich | Flexible packaging container in the form of a sack or bag made of plastic film |
DE4033499A1 (en) * | 1990-10-20 | 1992-04-23 | Silver Plastics Gmbh & Co Kg | Production of thermoplastic valve bags - overlapping perforated longitudinal edges of plastic film, strip of fibres and fused strip of same polymer and welding together by rollers |
EP0795482A2 (en) * | 1996-03-12 | 1997-09-17 | Fuji Techno Co., Ltd. | Food product packaging bag |
EP0920899A1 (en) * | 1997-11-25 | 1999-06-09 | Harry George Rhodes | Filtration assembly |
WO2007085390A1 (en) * | 2006-01-26 | 2007-08-02 | Mondi Packaging Ag | Multilayer paper sack |
WO2018215560A1 (en) * | 2017-05-23 | 2018-11-29 | Bischof + Klein Se & Co. Kg | Ventilatable valve bag |
WO2023075712A1 (en) * | 2021-11-01 | 2023-05-04 | Bangkok Polysack Co., Ltd. | A bag with ventilation strips for ventilating and protecting moisture access into the bag |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2593328A (en) * | 1948-07-13 | 1952-04-15 | John W Meaker | Perforated multiple ply bag |
GB1016476A (en) * | 1962-06-20 | 1966-01-12 | Sicedison Spa | Plastics bag |
US3302859A (en) * | 1964-12-21 | 1967-02-07 | Bemis Co Inc | Bag |
US3439869A (en) * | 1968-02-08 | 1969-04-22 | Dow Chemical Co | Vented bag |
DE1536367A1 (en) * | 1966-07-14 | 1969-12-11 | Windmoeller & Hoelscher | Sacks, in particular made of plastic film |
-
1983
- 1983-05-25 EP EP83303018A patent/EP0126816A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2593328A (en) * | 1948-07-13 | 1952-04-15 | John W Meaker | Perforated multiple ply bag |
GB1016476A (en) * | 1962-06-20 | 1966-01-12 | Sicedison Spa | Plastics bag |
US3302859A (en) * | 1964-12-21 | 1967-02-07 | Bemis Co Inc | Bag |
DE1536367A1 (en) * | 1966-07-14 | 1969-12-11 | Windmoeller & Hoelscher | Sacks, in particular made of plastic film |
US3439869A (en) * | 1968-02-08 | 1969-04-22 | Dow Chemical Co | Vented bag |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9002330U1 (en) * | 1990-02-28 | 1990-05-03 | Bischof Und Klein Gmbh & Co, 4540 Lengerich | Flexible packaging container in the form of a sack or bag made of plastic film |
EP0444261A1 (en) * | 1990-02-28 | 1991-09-04 | Bischof und Klein GmbH & Co. | Flexible packaging container in the form of a bag or pouch, made from plastic film |
DE4033499A1 (en) * | 1990-10-20 | 1992-04-23 | Silver Plastics Gmbh & Co Kg | Production of thermoplastic valve bags - overlapping perforated longitudinal edges of plastic film, strip of fibres and fused strip of same polymer and welding together by rollers |
EP0795482A2 (en) * | 1996-03-12 | 1997-09-17 | Fuji Techno Co., Ltd. | Food product packaging bag |
EP0795482A3 (en) * | 1996-03-12 | 1997-11-12 | Fuji Techno Co., Ltd. | Food product packaging bag |
US6398830B1 (en) | 1997-11-25 | 2002-06-04 | Pal Adhesive Products Limited | Filtration assembly |
EP0920899A1 (en) * | 1997-11-25 | 1999-06-09 | Harry George Rhodes | Filtration assembly |
EP1291066A2 (en) * | 1997-11-25 | 2003-03-12 | Harry George Rhodes | Filtration assembly |
EP1291066A3 (en) * | 1997-11-25 | 2003-08-06 | Harry George Rhodes | Filtration assembly |
WO2007085390A1 (en) * | 2006-01-26 | 2007-08-02 | Mondi Packaging Ag | Multilayer paper sack |
WO2018215560A1 (en) * | 2017-05-23 | 2018-11-29 | Bischof + Klein Se & Co. Kg | Ventilatable valve bag |
CN110914166A (en) * | 2017-05-23 | 2020-03-24 | 比朔夫+霍莱恩欧洲股份及合伙两合公司 | Valve bag capable of exhausting air |
US11214407B2 (en) | 2017-05-23 | 2022-01-04 | Bischof + Klein Se & Co. Kg | Ventilatable valve bag |
AU2018272943B2 (en) * | 2017-05-23 | 2023-11-16 | Bischof + Klein Se & Co. Kg | Ventilatable valve bag |
WO2023075712A1 (en) * | 2021-11-01 | 2023-05-04 | Bangkok Polysack Co., Ltd. | A bag with ventilation strips for ventilating and protecting moisture access into the bag |
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