WO1997046460A1 - Sac permeable - Google Patents

Sac permeable Download PDF

Info

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
Application number
PCT/FI1996/000334
Other languages
English (en)
Inventor
Valter Sievers
Pentti Rikassaari
Original Assignee
Upm-Kymmene Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Upm-Kymmene Oy filed Critical Upm-Kymmene Oy
Priority to PCT/FI1996/000334 priority Critical patent/WO1997046460A1/fr
Priority to EP96917509A priority patent/EP1040047B1/fr
Priority to CZ19983899A priority patent/CZ293746B6/cs
Priority to DE69633414T priority patent/DE69633414T2/de
Priority to ES96917509T priority patent/ES2227589T3/es
Publication of WO1997046460A1 publication Critical patent/WO1997046460A1/fr

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

Sac perméable comportant une couche intérieure perméable à l'air (1) et une couche extérieure (2; 2'). Sur la surface externe de la couche intérieure (1) sont ménagées des rainures (4) le long desquelles l'air qui s'est écoulé à travers la couche intérieure au cours du remplissage du sac peut s'échapper de l'espace entre les couches.
PCT/FI1996/000334 1996-06-05 1996-06-05 Sac permeable WO1997046460A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PCT/FI1996/000334 WO1997046460A1 (fr) 1996-06-05 1996-06-05 Sac permeable
EP96917509A EP1040047B1 (fr) 1996-06-05 1996-06-05 Sac permeable
CZ19983899A CZ293746B6 (cs) 1996-06-05 1996-06-05 Prodyšný pytel
DE69633414T DE69633414T2 (de) 1996-06-05 1996-06-05 Permeabler beutel
ES96917509T ES2227589T3 (es) 1996-06-05 1996-06-05 Saco permeable.

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 (1)

Publication Number Publication Date
WO1997046460A1 true WO1997046460A1 (fr) 1997-12-11

Family

ID=8556650

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1996/000334 WO1997046460A1 (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)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2201939A1 (es) * 2003-11-19 2004-03-16 Alberto Egia Quevedo Saco perfeccionado.
EP2100821A1 (fr) 2008-03-10 2009-09-16 Billerud AB Sac en papier deux épaisseurs
EP3184296B1 (fr) 2015-12-21 2017-11-08 BillerudKorsnäs AB Sac en papier résistant à la pluie
US20190217994A1 (en) * 2016-03-25 2019-07-18 Yozgat Kraft Torba Sanayi Ve Ticaret Anonim Sirketi Sack
CN110914166A (zh) * 2017-05-23 2020-03-24 比朔夫+霍莱恩欧洲股份及合伙两合公司 可排气的阀袋

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2582611B1 (es) * 2015-03-13 2017-06-07 Industrias Bolcar, S.A. Saco multicapa con salida de presión

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3117711A (en) * 1960-05-30 1964-01-14 Natro Cellulosa S P A Plastic bag
DE1611667B2 (de) * 1967-08-08 1975-02-27 Lissner, Hans, 4000 Duesseldorf Entlüftbarer Ventilsack
GB2171390A (en) * 1985-02-02 1986-08-28 Bischof & Klein Flexible packaging container for loose filling material
EP0661219A2 (fr) * 1993-12-28 1995-07-05 Packs Co. Ltd. Dispositif d'emballage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3117711A (en) * 1960-05-30 1964-01-14 Natro Cellulosa S P A Plastic bag
DE1611667B2 (de) * 1967-08-08 1975-02-27 Lissner, Hans, 4000 Duesseldorf Entlüftbarer Ventilsack
GB2171390A (en) * 1985-02-02 1986-08-28 Bischof & Klein Flexible packaging container for loose filling material
EP0661219A2 (fr) * 1993-12-28 1995-07-05 Packs Co. Ltd. Dispositif d'emballage

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2201939A1 (es) * 2003-11-19 2004-03-16 Alberto Egia Quevedo Saco perfeccionado.
EP2100821A1 (fr) 2008-03-10 2009-09-16 Billerud AB Sac en papier deux épaisseurs
EP3184296B1 (fr) 2015-12-21 2017-11-08 BillerudKorsnäs AB Sac en papier résistant à la pluie
US20190217994A1 (en) * 2016-03-25 2019-07-18 Yozgat Kraft Torba Sanayi Ve Ticaret Anonim Sirketi Sack
CN110914166A (zh) * 2017-05-23 2020-03-24 比朔夫+霍莱恩欧洲股份及合伙两合公司 可排气的阀袋
US11214407B2 (en) * 2017-05-23 2022-01-04 Bischof + Klein Se & Co. Kg Ventilatable valve bag

Also Published As

Publication number Publication date
ES2227589T3 (es) 2005-04-01
CZ293746B6 (cs) 2004-07-14
EP1040047A1 (fr) 2000-10-04
CZ389998A3 (cs) 1999-07-14
EP1040047B1 (fr) 2004-09-15
DE69633414T2 (de) 2005-09-22
DE69633414D1 (de) 2004-10-21

Similar Documents

Publication Publication Date Title
US5871790A (en) Laminated bag wall construction
US5845995A (en) Bag made of polymer and especially polyolefine fabric and process for producing it
US4811848A (en) Package with a gas-tight package envelope
US20070181459A1 (en) Multi-walled, sack-type packaging
CA2372052C (fr) Sac en papier a parois multiples
US3265287A (en) Iermetically sealed cigarette package with opening feature
RU2065389C1 (ru) Гибкий контейнер
US20090148636A1 (en) Multilayer bag of paper
US4132347A (en) Moisture proof bags provided with blow-in ports and method of manufacturing the same
US4634008A (en) Container made out of a flat material like paper, cardboard, etc. with a ridged-seam closure, especially a parallelepipedal container for liquid and made out of paper, plastic or composite
EP1040047B1 (fr) Sac permeable
US4677007A (en) Thermoplastic sack
US6053400A (en) Container having expanding or contracting end closure
US4026460A (en) Valve type shipping bag
US4364510A (en) Filling valve for a bag or other container
EP1781551B1 (fr) Emballage collectif et un materiau en feuilles, tel que du papier de bureau
WO1999001353A1 (fr) Sac ferme a degarnissage
EP0321850B1 (fr) Récipient d'emballage
JP2933667B2 (ja) 充填包装用複合シート
FI102526B (fi) Läpäisevä säkki
EP0291128A1 (fr) Sac à valve à soupape
EP1433711A1 (fr) Sac fabriqué en un materiau d'emballage souple
JP2017507088A (ja) 袋
CA2008704C (fr) Sac a rebuts avec attache integree
EP3009371B1 (fr) Sac avec soudure longitudinale discontinue

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CZ

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 1996917509

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: PV1998-3899

Country of ref document: CZ

NENP Non-entry into the national phase

Ref country code: CA

WWP Wipo information: published in national office

Ref document number: PV1998-3899

Country of ref document: CZ

WWP Wipo information: published in national office

Ref document number: 1996917509

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: PV1998-3899

Country of ref document: CZ

WWG Wipo information: grant in national office

Ref document number: 1996917509

Country of ref document: EP