EP1053184B1 - Close sack with air exhaustion - Google Patents
Close sack with air exhaustion Download PDFInfo
- Publication number
- EP1053184B1 EP1053184B1 EP98925654A EP98925654A EP1053184B1 EP 1053184 B1 EP1053184 B1 EP 1053184B1 EP 98925654 A EP98925654 A EP 98925654A EP 98925654 A EP98925654 A EP 98925654A EP 1053184 B1 EP1053184 B1 EP 1053184B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sack
- layer
- inner layer
- air
- flaps
- 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.)
- Expired - Lifetime
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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
- 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
- B65D31/14—Valve bags, i.e. with valves for filling
- B65D31/142—Valve bags, i.e. with valves for filling the filling port being formed by folding a flap connected to a side, e.g. block bottoms
Definitions
- the invention relates to paper sacks and applies to valve sacks equipped with barrier films, their manufacture and application. Sacks according to the invention can be used particularly for storing products that must be packaged as tightly as possible.
- valve sacks of paper When manufacturing valve sacks of paper, a tube is formed of the paper webs and cut into pieces of desired length, the ends are closed to form the bottom by first folding inwards the thinner end flaps and, on top of these, the wider side flaps. In all ends except the valve end, the side flaps are attached to the end flaps.
- the valve end can be supplemented with a separate paper-formed valve piece.
- the valve can comprise a closing flap which after the filling of the sack is folded and attached over the valve mouth to the bottom of the sack.
- Moisture-proof valve sacks have been manufactured from paper coated with plastic film or by placing a loose plastic film between paper layers.
- a preferred plastic has been polyethylene.
- valve sacks A problem with valve sacks is that when the sack is being filled air must be allowed to escape from the sack. This is a problem particularly in the case of sacks equipped with barrier films. Therefore the barrier film of these sacks has usually been perforated, which substantially impairs the barrier properties of the film.
- a multilayer sack can be made to be air permeable during the filling also as presented in the application publication FI-A-945831. Then the inner layer is of paper with good air permeability and has channels on its outer surface. During the filling of the sack the air that gets entrapped between the layers moves through the channels to the ends of the sack where it is allowed to escape. The ends of the sack blank mouth are end to end in this sack. This structure is nevertheless not adequately tight for all applications. Furthermore, in practise this sack always requires a separate bottom cover sheet.
- GB-A-623313 discloses a close sack with a multiply tubular mantle. On both ends of the mantle there is a plain bottom with end flaps folded inwards and side flaps folded on top the end flaps. The side flaps are adhesively secured together at both ends of the sack. The flaps of the multiply tubular mantle are superimposed such that they assume a staggered relation in the bag tubing machine. Further, a tongue is provided which extends inward beyond the other plies of the valve sack and forms a flexible projection. A recess is formed complimentary to the tongue which is closed by the folds of the bottom portion of the sack.
- a sack according to the invention can utilize a barrier film completely impermeable to air and moisture, yet during the filling of the sack air exhaustion from the sack is efficient. Also the sack bottoms are very tight due to the overlap structure.
- a sack according to the figures is made of a three-layer material. Innermost is an inner layer (1) of paper, outside of which is an air-impermeable barrier layer (2) and outermost an outer layer (3) of paper.
- cuts (4) are formed from the ends thus forming the side flaps (5) and the end flaps (6).
- the blank is slightly longer than in the region of the end flaps (6).
- the figures also show the transverse side creases (7) and the diagonal end creases (8) of the bottom along which the blank is folded to form a plane bottom, as well as the fold creases (9) along which the bottom is folded against the mantle.
- the inner layer (1) and the outer layer (3) can be of sack paper suitable for the purpose (strength e.g. 95 g / m2).
- the barrier layer (2) can be of suitable plastic film (e.g. HDPE).
- the barrier layer (2) is attached at both ends to the inner layer (1) with a transverse spot-glueing (10) and to the outer layer (3) with a transverse glueing (11) which in this case is also a spot-glueing.
- the glueings help in the alignment of the layers and they also strengthen the sack since stress is directed more evenly to all layers.
- the ends of the layers are graded to be of different length so that at the upper end of the blank on the front side of the mantle the inner layer (1) is the longest and the outer layer (3) the shortest, and on the back side the inner layer is the shortest and the outer layer the longest.
- the inner layer (1) is the shortest and the outer layer (3) the longest, and on the back side the inner layer is the longest and the outer layer the shortest.
- the grading of the material enables each material to be attached to each other in the bottom structure.
- the inner layer (1) is slightly longer than the barrier film (2) and the outer layer (3).
- the inner layer (1) is slightly shorter than the barrier layer (2) and the outer layer (3).
- a valve piece (12) of paper is attached to one of the ends of the upper end of the blank. Its lower edge is placed in the region of the side crease (7) and its upper edge reaches slightly above the side flaps (5).
- the valve piece (12) is glued to the end flap (6) from both sides slightly outside the cut (4) with a longitudinal glue line (13).
- a line (13) is further marked along which the valve piece is folded together with the side flap (5) along the side crease (7).
- the side flaps (5) of the front side are folded open along the fold crease (9) at the same time folding the end flaps (6) inwards along the end creases (8).
- the sides of the valve piece (12) are folded inwards in the region of the side creases (7) and glue lines (15) are formed on top of the folded sides from the edge of the fold inwards. In the region of the double end edge of the valve piece (12) the glue line (15) is slightly wider. After this, the side edges of the valve piece (12) are folded open again, and they adhere tightly to the end flap (6) to the inner layer of the side flaps (5).
- glue lines are formed with which the bottoms are closed.
- end glue lines (16.1) are formed from the outer surface of the end flap (6) from the side crease (7) to the inner surface of the side flap reaching to its end.
- side flap (5.2) to be on top where the inner layer (1) is the shortest, similar but shorter end glue lines (16.2) are formed.
- the end glue lines (16.2) are united along the edge of the inner layer (1) with a thinner inner side glue line (17).
- a thin outer side glue line (18) reaching from one end to the other is formed on the inner side.
- the end glue lines (16.1) and (16.2) and the inner side glue line (17) are naturally formed on top of the valve piece.
- each paper layer (1) and (3) is glued longitudinally to the sack against themselves (grading) with glue seams (17) and (18).
- the graded barrier layer (2) is not longitudinally glued to itself but it is cross glued with spot-glueing to the paper layers.
- the barrier layer can be glued by a cheap process glueing; no expensive and staining special glues are required.
- the bottom structure is completely tight towards the inside of the sack except for the valve which has a fill opening between the outer layer of the end flap (6) and the valve piece.
- the material inside presses the end flap (6) firmly against the valve piece (12).
- the valve mouth can also be further closed by a separate closing strip attached over the mouth against the bottom. Due to the overlap structure of the materials, the bottom is completely covered with an intact barrier film (2).
- the outer surface of the inner layer (1) can be fluted, but a smooth-surface paper will also work.
- Air exhaustion is very efficient when the air flows on both sides of the sack to both ends of the sack.
- No bottom cover sheet is required to form the exhaust air channel or to increase sack strength.
- the sacks can be manufactured with tube and bottom machines of conventional sack production lines, with additions to enable the necessary cuts, overlappings and glueings. No extra material is needed.
- the sack is particularly suitable for use with materials that need to be protected from the moisture of outside air as well as possible (cocoa, for example) or with materials the leaking of which from the sack must be prevented as well as possible (chemicals harmful to the environment, for example).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bag Frames (AREA)
- Cartons (AREA)
Description
A multilayer sack can be made to be air permeable during the filling also as presented in the application publication FI-A-945831. Then the inner layer is of paper with good air permeability and has channels on its outer surface. During the filling of the sack the air that gets entrapped between the layers moves through the channels to the ends of the sack where it is allowed to escape. The ends of the sack blank mouth are end to end in this sack. This structure is nevertheless not adequately tight for all applications. Furthermore, in practise this sack always requires a separate bottom cover sheet.
Thus in the bottom structure each paper layer (1) and (3) is glued longitudinally to the sack against themselves (grading) with glue seams (17) and (18). The graded barrier layer (2) is not longitudinally glued to itself but it is cross glued with spot-glueing to the paper layers. Thus the loose unglued film structure enables air exhaustion from the ends of the bottom, but since overlapped forms a moisture barrier to the bottom structure. The barrier layer can be glued by a cheap process glueing; no expensive and staining special glues are required.
Claims (5)
- A close sack with a multilayer tubular mantle, on both ends of which mantle there is a plane bottom with end flaps (6) folded inwards and side flaps (5.1, 5.2) folded on top of the end flaps, wherein the inner surface of the side flap (5.2) on top is glued against the outer surface of the side flap (5.1) underneath, characterized in that the mantle comprises an air-permeable but dust-filtering inner layer (1) of paper, outside of which a separate air-impermeable barrier layer (2) and outside of that one or several outer layers (3) of paper, in that at one of the ends of one bottom a valve piece (12) is attached to the end flap (6), in that in the side flap (5.1) underneath in the bottom, the inner layer (1) is longer than the barrier layer and the outer layer (3) is shorter than the barrier layer (2); in the side flap (5.2) on top, the inner layer (1) is shorter than the barrier layer (2) and the outer layer (3) is longer than the barrier layer (2);
the inner surface of the inner layer (1) of the side flap (5.2) on top is glued against the outer surface of the inner layer (1) of the side flap (5.1) underneath with an inner side glue line (17); and
the inner surface of the outer layer (3) of the side flap (5.2) on top is glued against the outer surface of the side flap (5.1) underneath with an outer side glue line (18), thus enabling air to escape from the area between the inner layer (1) and the barrier layer (2) in the bottom to the area between the side flaps (5.1, 5.2) and out from there through the ends of the bottom; and
in that the inner layer (1) of the side flaps (5.1, 5.2) is glued to the end flaps (6) respectively to the valve piece (12) with glue seams (16.1, 16.2), so that the gluing of the bottom ends with seams (16.1, 16.2) closes and tightens the bottom. - A sack according to claim 1, characterized in that air is allowed to escape through both ends of the bottom.
- A sack according to claim 1 or 2, characterized in that air is allowed to escape through both ends of the sack.
- A sack according to claim 3, characterized in that air is allowed to move in the area between the inner layer (1) and the barrier layer (2) on both sides of the sack to both ends of the sack.
- A sack according to one of the claims 1 to 4, characterized in that the barrier layer (2) is glued to the inner layer (1) or the outer layer (3) at the ends of the mantle with a transverse spot glueing (10/11).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI972664 | 1997-06-19 | ||
FI972664A FI103269B1 (en) | 1997-06-19 | 1997-06-19 | Closure bag with deaeration |
PCT/FI1998/000490 WO1999001353A1 (en) | 1997-06-19 | 1998-06-09 | Close sack with air exhaustion |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1053184A1 EP1053184A1 (en) | 2000-11-22 |
EP1053184B1 true EP1053184B1 (en) | 2003-05-07 |
Family
ID=8549098
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98925654A Expired - Lifetime EP1053184B1 (en) | 1997-06-19 | 1998-06-09 | Close sack with air exhaustion |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1053184B1 (en) |
CZ (1) | CZ291930B6 (en) |
DE (1) | DE69814470T2 (en) |
ES (1) | ES2193530T3 (en) |
FI (1) | FI103269B1 (en) |
WO (1) | WO1999001353A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3184296B1 (en) | 2015-12-21 | 2017-11-08 | BillerudKorsnäs AB | Rain resistant paper sack |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI111617B (en) * | 2000-01-28 | 2003-08-29 | Korsnaes Packaging Ab | A closure bag and a method of making a closure bag |
ES2201939B1 (en) * | 2003-11-19 | 2005-03-01 | Alberto Egia Quevedo | PERFECTED SACO. |
ES2212925B1 (en) * | 2004-03-31 | 2005-05-01 | Star Sack, S.L. | BAGS WITH IMPROVED INCORPORATED FILTER. |
DE102006050461B4 (en) * | 2006-10-20 | 2009-07-09 | Mondi Ag | valve bag |
DE202014000194U1 (en) | 2014-01-10 | 2015-04-14 | Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh | paper bags |
ES2568555B1 (en) * | 2014-10-29 | 2017-01-24 | Industrias Bolcar, S.A. | Multilayer bag with pressure outlet |
US20190217994A1 (en) * | 2016-03-25 | 2019-07-18 | Yozgat Kraft Torba Sanayi Ve Ticaret Anonim Sirketi | Sack |
DE202017103128U1 (en) | 2017-05-23 | 2018-08-24 | Bischof + Klein Se & Co. Kg | Ventable valve bag |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB623313A (en) * | 1947-04-29 | 1949-05-16 | Paper Sacks Ltd | Improvements in and relating to multiply valve sacks |
DE2319672C3 (en) * | 1973-04-18 | 1986-02-13 | Wilhelmstal-Werke Gmbh Papiersackfabriken, 7590 Achern | Multi-layer sack |
DE2615543C2 (en) * | 1976-04-09 | 1984-08-23 | Bischof Und Klein Gmbh & Co, 4540 Lengerich | Cross-bottom valve bag made of staggered paper layers |
-
1997
- 1997-06-19 FI FI972664A patent/FI103269B1/en not_active IP Right Cessation
-
1998
- 1998-06-09 WO PCT/FI1998/000490 patent/WO1999001353A1/en active IP Right Grant
- 1998-06-09 EP EP98925654A patent/EP1053184B1/en not_active Expired - Lifetime
- 1998-06-09 CZ CZ19994589A patent/CZ291930B6/en not_active IP Right Cessation
- 1998-06-09 ES ES98925654T patent/ES2193530T3/en not_active Expired - Lifetime
- 1998-06-09 DE DE69814470T patent/DE69814470T2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3184296B1 (en) | 2015-12-21 | 2017-11-08 | BillerudKorsnäs AB | Rain resistant paper sack |
Also Published As
Publication number | Publication date |
---|---|
FI103269B (en) | 1999-05-31 |
CZ9904589A3 (en) | 2001-08-15 |
FI972664A0 (en) | 1997-06-19 |
FI972664A (en) | 1998-12-20 |
EP1053184A1 (en) | 2000-11-22 |
WO1999001353A1 (en) | 1999-01-14 |
DE69814470D1 (en) | 2003-06-12 |
FI103269B1 (en) | 1999-05-31 |
DE69814470T2 (en) | 2004-03-18 |
CZ291930B6 (en) | 2003-06-18 |
ES2193530T3 (en) | 2003-11-01 |
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