EP1040047B1 - Permeabler beutel - Google Patents

Permeabler beutel Download PDF

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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
Application number
EP96917509A
Other languages
English (en)
French (fr)
Other versions
EP1040047A1 (de
Inventor
Valter Sievers
Pentti Rikassaari
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UPM Kymmene Oy
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
Publication of EP1040047A1 publication Critical patent/EP1040047A1/de
Application granted granted Critical
Publication of EP1040047B1 publication Critical patent/EP1040047B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

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)

  1. Permeabler Beutel mit einer luftdurchlässigen Innenschicht (1) und einer Außenschicht (2, 2'), bei dem die offenen Enden zum Bilden von Böden verschlossen sind und bei dem die Außenfläche der inneren Schicht (1) Kanäle (4) aufweist, entlang denen Luft abströmen kann, die während des Füllens des Beutels durch die Innenschicht geströmt ist,
    dadurch gekennzeichnet, dass eine Dampfsperreschicht (3) zwischen Innenschicht und Außenschicht sich befindet, dass die Außenschicht (2, 2') während des Füllens keine Perforation hat und dass die Luft aus den Kanälen (4) aus dem Zwischenraum zwischen der Innenschicht (1) und der Außenschicht (2, 2') aus dem Kantenbereich dieser Schichten entweicht.
  2. Beutel nach Anspruch 1,
    dadurch gekennzeichnet, dass die Kanäle (4) im wesentlichen in der Längsrichtung des Beuteils verlaufen.
  3. Beutel nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass der Beutel durch Falten der Enden verschlossen ist, um einen ebenen Boden zu bilden und dass an einem Ende des Beutels die überlappende Klappe (6) der Vorderseite zuoberst gefaltet ist und am anderen Ende des Beutels die überlappende Klappe der Rückseite.
  4. Beutel nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass ein Bodendeckblatt (8) auf dem Boden zugeordnet ist.
  5. Beutel nach Anspruch 4,
    dadurch gekennzeichnet, dass das Bodendeckblatt (8) kürzer als der Boden ist.
  6. Beutel nach Anspruch 4 oder 5,
    dadurch gekennzeichnet, dass das Bodendeckblatt (8) in Klebstoffstreifen zugeordnet ist, die in Längsrichtung des Bodens so verlaufen, das im Bereich des Endes (7) der auf die Oberseite gefalteten Klappe kein Klebstoff sich befindet, stattdessen aber ein Luftauslaßkanal (11).
  7. Beutel nach Anspruch 6.
    dadurch gekennzeichnet, dass im Bereich des Endes (7) der Klappe ein Luftauslaßkanal (11) sich befindet, der in Längsrichtung des Bodens verläuft.
  8. Beutel nach Anspruch 6 oder 7,
    dadurch gekennzeichnet, dass im Zwischenraum zwischen dem Ende (7) der Klappe und der Kante des Bodens Klebstoff (9.1) in einer unterbrochenen Linie angeordnet ist.
  9. Beutel nach einem der Ansprüche 4 bis 8,
    dadurch gekennzeichnet, dass das Bodendeckblatt Perforationen (12) aufweist.
  10. Beutel nach den Ansprüchen 6 und 9,
    dadurch gekennzeichnet, dass das Bodendeckblatt Perforationen (12) im Bereich des Endes der auf die Oberseite gefalteten Seitenklappe aufweist.
  11. Beutel nach einem der Ansprüche 1 bis 10,
    dadurch gekennzeichnet, dass die Dampfsperreschicht (3) eine freie Folie zwischen der Innen- und der Außenschicht ist.
  12. Beutel nach einem der Ansprüche 1 bis 10,
    dadurch gekennzeichnet, dass die Dampfsperreschicht (3) der Innenfläche der Außenschicht zugeordnet ist.
  13. Beutel nach einem der Ansprüche 1 bis 12,
    dadurch gekennzeichnet, dass Kanäle (5) auf der Innenfläche der Außenschicht (2') zugeordnet sind.
EP96917509A 1996-06-05 1996-06-05 Permeabler beutel Expired - Lifetime EP1040047B1 (de)

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 (2)

Publication Number Publication Date
EP1040047A1 EP1040047A1 (de) 2000-10-04
EP1040047B1 true EP1040047B1 (de) 2004-09-15

Family

ID=8556650

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96917509A Expired - Lifetime EP1040047B1 (de) 1996-06-05 1996-06-05 Permeabler beutel

Country Status (5)

Country Link
EP (1) EP1040047B1 (de)
CZ (1) CZ293746B6 (de)
DE (1) DE69633414T2 (de)
ES (1) ES2227589T3 (de)
WO (1) WO1997046460A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2201939B1 (es) * 2003-11-19 2005-03-01 Alberto Egia Quevedo Saco perfeccionado.
EP2100821B1 (de) 2008-03-10 2010-05-19 Billerud 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)

* 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
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

Also Published As

Publication number Publication date
CZ389998A3 (cs) 1999-07-14
ES2227589T3 (es) 2005-04-01
DE69633414T2 (de) 2005-09-22
DE69633414D1 (de) 2004-10-21
CZ293746B6 (cs) 2004-07-14
WO1997046460A1 (en) 1997-12-11
EP1040047A1 (de) 2000-10-04

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