EP1040047B1 - Sac permeable - Google Patents
Sac permeable Download PDFInfo
- Publication number
- EP1040047B1 EP1040047B1 EP96917509A EP96917509A EP1040047B1 EP 1040047 B1 EP1040047 B1 EP 1040047B1 EP 96917509 A EP96917509 A EP 96917509A EP 96917509 A EP96917509 A EP 96917509A EP 1040047 B1 EP1040047 B1 EP 1040047B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sack
- layer
- outer layer
- air
- channels
- 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
Links
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
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.
- DE-1611667 describes a two layer sack in which the outer layer has areas with relatively large holes through which air can escape from the space between the layers. When no air escape is needed, these areas are covered with a sealing patch.
- EP-A-661219 describes a wrapping device having a laminate film including an outer layer and an inner layer. A communication passage is provided at a non-bonded portion by the layers.
- 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 outer layer.
- 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.
- a moisture barrier is used in the sack. It is placed between the inner and outer layer. 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.
- a sack sheath according to Fig. 1 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. During the filling of the sack, air moves through the inner layer 1 to the channels 4 and flows along the channels away from the space between the layers.
- 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 overpressure 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.
- Figure 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. Air escapes in the longitudinal direction of the sack from the channels 4 at the end 7 of the overlap flap.
- 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 11 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.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bag Frames (AREA)
Claims (13)
- Sac perméable avec une couche intérieure perméable à l'air (1) et une couche extérieure (2 ; 2'), les embouchures de ce sac étant fermées de façon à former des fonds, et dans ce sac, la surface extérieure de la couche intérieure (1) comportant des canaux (4) le long desquels l'air qui s'est écoulé à travers la couche intérieure durant le remplissage du sac peut s'échapper depuis l'espace entre les couches, caractérisé en ce qu'il y a une couche de barrière d'arrêt de l'humidité (3) entre la couche intérieure et la couche extérieure, en ce que la couche extérieure (2 ; 2') ne comporte pas de perforations durant le remplissage, et en ce que l'air s'échappe des canaux (4) à partir de l'espace entre la couche intérieure (1) et la couche extérieure (2 ; 2') à partir du bord de ces couches.
- Sac selon la revendication 1, caractérisé en ce que les canaux (4) se trouvent essentiellement dans la direction longitudinale du sac.
- Sac selon la revendication 1 ou 2, caractérisé en ce que le sac est fermé par pliage des extrémités de façon à former un fond plan, et en ce que, sur une extrémité du sac, le volet de recouvrement (6) du côté avant est replié vers le haut, et en ce que, sur l'autre extrémité du sac, le volet de recouvrement est celui du côté arrière.
- Sac selon l'une des revendications 1 à 3, caractérisé en ce qu'une feuille de couverture de fond (8) est fixée au-dessus du fond.
- Sac selon la revendication 4, caractérisé en ce que la feuille de couverture de fond (8) est plus courte que le fond.
- Sac selon la revendication 4 ou 5, caractérisé en ce que la feuille de couverture de fond (8) est fixée avec des lignes d'adhésif dans la direction longitudinale du fond, de telle sorte que la surface de l'extrémité (7) du volet pliée par-dessus ne soit pas adhésive mais constitue au contraire un canal de sortie d'air (11).
- Sac selon la revendication 6, caractérisé en ce que, au niveau de la zone de l'extrémité (7) du volet, se trouve un canal de sortie d'air (11) dans la direction longitudinale du fond.
- Sac selon la revendication 6 ou 7, caractérisé en ce que, dans l'espace entre l'extrémité (7) du volet et le bord du fond, se trouve une ligne interrompue d'adhésif (9.1).
- Sac selon l'une des revendications 4 à 8, caractérisé en ce qu'il y a des perforations (12) sur la feuille de couverture de fond.
- Sac selon les revendications 6 et 9, caractérisé en ce qu'il y a des perforations (12) sur la feuille de couverture de fond au niveau de la zone de l'extrémité du volet latéral plié par-dessus.
- Sac selon l'une des revendications 1 à 10, caractérisé en ce que la couche de barrière d'arrêt de l'humidité (3) est un film non fixé entre la couche intérieure et la couche extérieure.
- Sac selon l'une des revendications 1 à 10, caractérisé en ce que la couche de barrière d'arrêt de l'humidité (3) est fixée à la surface intérieure de la couche extérieure.
- Sac selon l'une des revendications 1 à 12, caractérisé en ce qu'il y a des canaux (5) sur la surface intérieure de la couche extérieure (2').
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/FI1996/000334 WO1997046460A1 (fr) | 1996-06-05 | 1996-06-05 | Sac permeable |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1040047A1 EP1040047A1 (fr) | 2000-10-04 |
EP1040047B1 true EP1040047B1 (fr) | 2004-09-15 |
Family
ID=8556650
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96917509A Expired - Lifetime EP1040047B1 (fr) | 1996-06-05 | 1996-06-05 | Sac permeable |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1040047B1 (fr) |
CZ (1) | CZ293746B6 (fr) |
DE (1) | DE69633414T2 (fr) |
ES (1) | ES2227589T3 (fr) |
WO (1) | WO1997046460A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2201939B1 (es) * | 2003-11-19 | 2005-03-01 | Alberto Egia Quevedo | Saco perfeccionado. |
DE602008001308D1 (de) | 2008-03-10 | 2010-07-01 | Billeruds Ab | Zweischichten-Papiersack |
ES2582611B1 (es) * | 2015-03-13 | 2017-06-07 | Industrias Bolcar, S.A. | Saco multicapa con salida de presión |
ES2658291T3 (es) | 2015-12-21 | 2018-03-09 | Billerudkorsnäs Ab | Saco de papel resistente a la lluvia |
US20190217994A1 (en) * | 2016-03-25 | 2019-07-18 | Yozgat Kraft Torba Sanayi Ve Ticaret Anonim Sirketi | Sack |
DE202017103128U1 (de) * | 2017-05-23 | 2018-08-24 | Bischof + Klein Se & Co. Kg | Entlüftbarer Ventilsack |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3117711A (en) * | 1960-05-30 | 1964-01-14 | Natro Cellulosa S P A | Plastic bag |
DE1611667C3 (de) * | 1967-08-08 | 1979-05-31 | Fardem-Lissner Gmbh, 4040 Neuss | Entlüftbarer Ventilsack |
GB2171390B (en) * | 1985-02-02 | 1989-03-01 | Bischof & Klein | Flexible packaging container for loose filling material |
KR100193465B1 (ko) * | 1993-12-28 | 1999-06-15 | 가타야마 도루 | 포장용구 |
-
1996
- 1996-06-05 DE DE69633414T patent/DE69633414T2/de not_active Expired - Fee Related
- 1996-06-05 WO PCT/FI1996/000334 patent/WO1997046460A1/fr active IP Right Grant
- 1996-06-05 ES ES96917509T patent/ES2227589T3/es not_active Expired - Lifetime
- 1996-06-05 CZ CZ19983899A patent/CZ293746B6/cs not_active IP Right Cessation
- 1996-06-05 EP EP96917509A patent/EP1040047B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CZ389998A3 (cs) | 1999-07-14 |
WO1997046460A1 (fr) | 1997-12-11 |
DE69633414D1 (de) | 2004-10-21 |
DE69633414T2 (de) | 2005-09-22 |
CZ293746B6 (cs) | 2004-07-14 |
EP1040047A1 (fr) | 2000-10-04 |
ES2227589T3 (es) | 2005-04-01 |
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