WO1997046460A1 - Permeable sack - Google Patents
Permeable sack Download PDFInfo
- Publication number
- WO1997046460A1 WO1997046460A1 PCT/FI1996/000334 FI9600334W WO9746460A1 WO 1997046460 A1 WO1997046460 A1 WO 1997046460A1 FI 9600334 W FI9600334 W FI 9600334W WO 9746460 A1 WO9746460 A1 WO 9746460A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sack
- layer
- channels
- air
- sack according
- Prior art date
Links
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
Definitions
- the invention relates to multi layer sleeve valve sacks. Particularly the invention concerns the escape of air from the sack during the filling of the sack.
- the rate of escape of air through the sack sheath is parallel to the sheath surface area.
- the air permeability of the sheath should be correspondingly improved.
- a sack according to the invention is essentially characterized in that there are channels on the outer surface of the inner layer, along which the air that has moved through the inner layer is allowed to escape from the space between the layers.
- the air permeability of the sheath is essentially improved without perforation of the sack.
- air from the point of view of the invention, can refer to any gas used during the filling stage.
- Channels between the layers also increase the friction between the layers thus adding to sack strength.
- the invention is particularly useful when a moisture barrier is used in the sack. It is placed outside the channels. Depending on the circumstances, the moisture barrier can even be lightly perforated to improve air permeability yet maintaining adequate moisture barrier properties.
- the inner layer is porous and strong sack paper with good air permeability. Paper which is porous enough needs no perforation which means than no material leakage occurs, not even between the layers.
- the outer layer may be of any material suitable for the purpose.
- the channels are preferably made to the paper before the final drying in the process of manufacture, since then the channels do not essentially weaken the paper by breaking the fibres.
- Figure 1 shows the sheath layers of a two-layer sack according to the invention
- Figure 2 shows an alternate embodiment of the sack in Fig. 1 .
- Figure 3 shows a bottom of a sack according to the invention.
- a sack sheath there is an inner paper layer 1 , an outer paper layer 2 and, between these layers, a moisture barrier layer 3.
- the inner layer 1 On the outer surface of the inner layer 1 there are parallel channels 4.
- the inner layer 1 has good air permeability. Its air permeability resistance according to the
- Gurley standard is, e.g., 6 ⁇ 2 s.
- air moves through the inner layer 1 to the channels 4 and flows along the channels away from the space between the layers.
- the basis weight of the inner layer 1 is 90 g m 2
- the thickness of the layer is approx. 70 ⁇ m of which the depth of the channels 4 is, e.g., approx. 15 - 20 ⁇ m.
- the width of the channels is, e.g., 2 - 5 mm and the space between them is, e.g., 1 - 2 mm.
- the moisture barrier 3 is of suitable plastic, such as polyethylene of 10 - 15 ⁇ m. It is adhered only from the mouth regions of the sack to the paper layers 1 and 2 by light dot adhesion.
- the moisture barrier can nevertheless also be a layer laminated on the paper surface.
- the moisture barrier is preferably on the inner surface of the outer layer.
- the moisture barrier can be lightly perforated to improve air permeability.
- suitable perforation quantity is, for example, only 30 - 40 % of what is conventionally used.
- the inner layer may also consist of several sublayers.
- the channels are preferably placed on the outer surface of the innermost sublayer.
- the other sublayers may also be channelled.
- the outer layer is made of paper with strength properties suitable for the purpose.
- the outer layer may also consist of several sublayers.
- the outer layer 2' is made of channelled paper in which the channels 5 are on the inner surface. This way the over- pressure in the channels 4 pushes the moisture barrier film 3 into the channels 5 on the outer layer, and the cross-sectional area of the air flow channel between the film and the inner layer 1 correspondingly grows.
- FIG. 3 shows the bottom of a sack in a filling situation.
- the front side of the sack is folded to the bottom area to form a topmost overlap flap 6.
- a bottom cover sheet 8 is further attached.
- the bottom cover sheet 8 is attached with adhesive seams 9, 9.1 and 10 in the longitudinal direction of the bottom, which seams may be either continuous or broken.
- the bottom cover sheet does not have any adhesive applied to it, as a result of which a channel 1 1 in the longitudinal direction of the bottom is formed at this area, along which channel air is allowed to escape from the bottom ends.
- a channel 1 1 in the longitudinal direction of the bottom is formed at this area, along which channel air is allowed to escape from the bottom ends.
- the bottom cover sheet is preferably made a little shorter than the bottom so that during the filling stage the end 13 of the sheet does not close the air channel of the bottom against the end fold 14 of the bottom.
- the overlap flap of the back side of the sack is folded topmost to the bottom area, which allows the air to escape from both ends of the sack.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/FI1996/000334 WO1997046460A1 (en) | 1996-06-05 | 1996-06-05 | Permeable sack |
ES96917509T ES2227589T3 (en) | 1996-06-05 | 1996-06-05 | PERMEABLE SACK. |
DE69633414T DE69633414T2 (en) | 1996-06-05 | 1996-06-05 | PERMEABLE BAG |
EP96917509A EP1040047B1 (en) | 1996-06-05 | 1996-06-05 | Permeable sack |
CZ19983899A CZ293746B6 (en) | 1996-06-05 | 1996-06-05 | Permeable sack |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/FI1996/000334 WO1997046460A1 (en) | 1996-06-05 | 1996-06-05 | Permeable sack |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997046460A1 true WO1997046460A1 (en) | 1997-12-11 |
Family
ID=8556650
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI1996/000334 WO1997046460A1 (en) | 1996-06-05 | 1996-06-05 | Permeable sack |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1040047B1 (en) |
CZ (1) | CZ293746B6 (en) |
DE (1) | DE69633414T2 (en) |
ES (1) | ES2227589T3 (en) |
WO (1) | WO1997046460A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2201939A1 (en) * | 2003-11-19 | 2004-03-16 | Alberto Egia Quevedo | Coating layer, has head part provided with holes, and bottom part covered with strip that is inserted into central part of holes, where strip is in contact with front side of filter |
EP2100821A1 (en) | 2008-03-10 | 2009-09-16 | Billerud AB | Two-ply paper sack |
EP3184296B1 (en) | 2015-12-21 | 2017-11-08 | BillerudKorsnäs AB | Rain resistant paper sack |
US20190217994A1 (en) * | 2016-03-25 | 2019-07-18 | Yozgat Kraft Torba Sanayi Ve Ticaret Anonim Sirketi | Sack |
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 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2582611B1 (en) * | 2015-03-13 | 2017-06-07 | Industrias Bolcar, S.A. | Multilayer bag with pressure outlet |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3117711A (en) * | 1960-05-30 | 1964-01-14 | Natro Cellulosa S P A | Plastic bag |
DE1611667B2 (en) * | 1967-08-08 | 1975-02-27 | Lissner, Hans, 4000 Duesseldorf | Ventable valve bag |
GB2171390A (en) * | 1985-02-02 | 1986-08-28 | Bischof & Klein | Flexible packaging container for loose filling material |
EP0661219A2 (en) * | 1993-12-28 | 1995-07-05 | Packs Co. Ltd. | Wrapping device |
-
1996
- 1996-06-05 EP EP96917509A patent/EP1040047B1/en not_active Expired - Lifetime
- 1996-06-05 DE DE69633414T patent/DE69633414T2/en not_active Expired - Fee Related
- 1996-06-05 CZ CZ19983899A patent/CZ293746B6/en not_active IP Right Cessation
- 1996-06-05 ES ES96917509T patent/ES2227589T3/en not_active Expired - Lifetime
- 1996-06-05 WO PCT/FI1996/000334 patent/WO1997046460A1/en active IP Right Grant
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3117711A (en) * | 1960-05-30 | 1964-01-14 | Natro Cellulosa S P A | Plastic bag |
DE1611667B2 (en) * | 1967-08-08 | 1975-02-27 | Lissner, Hans, 4000 Duesseldorf | Ventable valve bag |
GB2171390A (en) * | 1985-02-02 | 1986-08-28 | Bischof & Klein | Flexible packaging container for loose filling material |
EP0661219A2 (en) * | 1993-12-28 | 1995-07-05 | Packs Co. Ltd. | Wrapping device |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2201939A1 (en) * | 2003-11-19 | 2004-03-16 | Alberto Egia Quevedo | Coating layer, has head part provided with holes, and bottom part covered with strip that is inserted into central part of holes, where strip is in contact with front side of filter |
EP2100821A1 (en) | 2008-03-10 | 2009-09-16 | Billerud AB | Two-ply paper sack |
EP3184296B1 (en) | 2015-12-21 | 2017-11-08 | BillerudKorsnäs AB | Rain resistant paper sack |
US20190217994A1 (en) * | 2016-03-25 | 2019-07-18 | Yozgat Kraft Torba Sanayi Ve Ticaret Anonim Sirketi | Sack |
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 |
Also Published As
Publication number | Publication date |
---|---|
CZ293746B6 (en) | 2004-07-14 |
DE69633414D1 (en) | 2004-10-21 |
EP1040047A1 (en) | 2000-10-04 |
EP1040047B1 (en) | 2004-09-15 |
CZ389998A3 (en) | 1999-07-14 |
ES2227589T3 (en) | 2005-04-01 |
DE69633414T2 (en) | 2005-09-22 |
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