EP0958183B1 - Sac hermetique - Google Patents

Sac hermetique Download PDF

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Publication number
EP0958183B1
EP0958183B1 EP96933453A EP96933453A EP0958183B1 EP 0958183 B1 EP0958183 B1 EP 0958183B1 EP 96933453 A EP96933453 A EP 96933453A EP 96933453 A EP96933453 A EP 96933453A EP 0958183 B1 EP0958183 B1 EP 0958183B1
Authority
EP
European Patent Office
Prior art keywords
flap
creasing
flaps
glue
folded
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
EP96933453A
Other languages
German (de)
English (en)
Other versions
EP0958183A1 (fr
Inventor
Pentti Rikassaari
Valter Sievers
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.)
KORSNAES PACKAGING AB
Original Assignee
KORSNAES (PUBL) AB
KORSNAES PUBL AB
Korsnas AB
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 KORSNAES (PUBL) AB, KORSNAES PUBL AB, Korsnas AB filed Critical KORSNAES (PUBL) AB
Publication of EP0958183A1 publication Critical patent/EP0958183A1/fr
Application granted granted Critical
Publication of EP0958183B1 publication Critical patent/EP0958183B1/fr
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
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/18—End- or aperture-closing arrangements or devices using adhesive applied to integral parts, e.g. to flaps

Definitions

  • This invention relates to paper sacks, and applies to the sealing of a paper sack mouth which is closed by glueing.
  • the invention can be utilized for both open-mouth sacks and sleeve valve bags, and it can be realized with conventional sack manufacturing methods.
  • a hose is formed of the paper web and cut into parisons of the desired length, and either one end or both ends are closed to form the bottom. If both ends are closed, a topping-up valve is left on the bottom between the flaps folded one upon another.
  • the bottom is usually closed by first folding inwards the thinner end flaps and, on top of these, the wider side flaps. Before the side flaps are folded, glue sectors are formed; end glue sectors which help attache the side flaps to the end flaps, and side glue sectors which help attache the edge of one side flap to the other side flap.
  • Tightness can be improved also by glueing a separate sealing piece between the flaps. This, however, requires a separate unit for the machine and can therefore not be realized with production lines already in use.
  • US-A-3343748 describes a plastic bag in which cuts are formed in the bottom from the end to the diagonal creasing and a film is placed between the flaps. Also US-A-3439864 describes a plastic bag with corresponding cuts. However, it is also essential that the bottom seal prepared in the way described is not tight.
  • a paper sack according to claim 1 has now been invented.
  • a preferred embodiment of the invention is presented in claim 2.
  • a method for making it is presented in claim 3.
  • the invention can be realized with a bottom machine of a conventional sack production line without any additional units. Extra material is not required.
  • the end of a parison cut from the paper hose is closed with a so-called bottom machine. It is used to form the diagonal creasings (3) from the parison edges (1) to the end (2) and a horizontal centre creasing (4), to fold the end flaps (5) of the bottom inwards along the diagonal creasings, to form the horizontal side creasings (6), to form the necessary end glue sectors (7) and side glue sectors (8) and to fold along the side creasings the side flaps (9 and 9') on top of the end flaps. (For the sake of clarity, all creasings are illustrated by dashed line in Fig.
  • a cut (10) is made on the end flap (5) of the parison inwards from the end (2) of the parison and the side creasing (6), towards the longitudinal axis of the parison, reaching to the diagonal creasing (3).
  • Sharp-pointed additional flaps (11) thus formed on the end flaps (5) are folded outwards along the diagonal creasings (3).
  • the best way to make the cut is by the end of the side creasing (6) perpendicularly to the diagonal creasing.
  • the end glue sector (7) is formed on the inner surface of the side flap and the exterior surface of the end flap so that it reaches from the tip of the additional flap along the exterior edge (12) of the cut, over the inner edge (13) of the cut and along the exterior edge of the end flap to the side creasing (6).
  • the inner edge of the end glue sector is parallel with the longitudinal axis of the parison.
  • the side glue sector (8) is formed on the inner surface of the end of the uppermost side flap (9') so that the aforesaid side flap when folded adheres to the side flap (9) underneath.
  • Additional flaps (11) formed on the bottom cause no disadvantages, and normally they are covered by the bottom piece. In fact, the additional flaps even strengthen and reinforce the sack.
  • the strength of multi-layer sacks according to the invention can be further improved by glueing layers together at certain points.
  • Critical points include especially the end edge and end angles of the bottom of a filled sack.
  • Fig. 1 shows the glue sectors (14) and (15) added between the paper layers to reinforce these areas.
  • the invention can be utilized in the manufacture of one-layer and multi-layer sacks.
  • the sacks are two-layer sacks.
  • the layer ends of multi-layer sacks can be fitted to overlap as appropriate to further improve tightness.
  • Sacks according to the invention can be manufactured with conventional sack production lines already in use.
  • the helical cut (10) can be easily realized with conventional tools with a bottom machine in connection to creasing.
  • the end glue sector (7) can also be easily brushed in the desired shape with conventional distributor rolls. No extra material is required in the production, and the production is not essentially slowed up.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Making Paper Articles (AREA)

Claims (3)

  1. Sac en papier hermétique avec un fond fermé par collage, qui a des volets terminaux (5) pliés vers l'intérieur le long du froncement diagonal et des volets latéraux (9, 9') pliés sur le dessus des volets terminaux le long du froncement latéral horizontal (6) et dans lequel les volets latéraux sont fixés au volet terminal (5) avec des secteurs de collage terminaux (7) et un secteur de collage latéral (8) est constitué sur la surface intérieure de l'extrémité du volet latéral le plus haut (9') de sorte que le volet latéral précité lorsqu'il est plié adhère au volet latéral (9) au-dessous, caractérisé en ce que le volet terminal (5) a une découpe (10) qui s'étend du froncement latéral (6) jusqu'au froncement diagonal (3), que le volet supplémentaire (11) ainsi constitué sur le volet latéral (9, 9') a été plié ouvert avant que le volet latéral n'ait été plié contre le volet terminal et que les secteurs de collage terminaux (7) vont du volet latéral (9, 9'), en passant par le bord intérieur (13) de la découpe et le long du bord extérieur du volet terminal (5), au froncement latéral (6).
  2. Sac selon la revendication 1, caractérisé en ce que la découpe (10) s'étend de l'extrémité du froncement latéral (6) perpendiculairement au froncement diagonal (3).
  3. Procédé de fabrication d'un sac en papier hermétique, le procédé incluant la constitution d'un tuyau à partir d'une bande de papier, le découpage du tuyau en paraisons, le pliage de volets terminaux (5) vers l'intérieur le long du froncement diagonal et sur le dessus de ces volets latéraux (9, 9') le long du froncement latéral horizontal (6) et la fixation des volets latéraux au volet terminal (5) avec des secteurs de collage terminaux (7) et constituant un secteur de collage latéral (8) sur la surface intérieure de l'extrémité du volet latéral le plus haut (9') et le pliage et le collage du volet latéral précité au volet latéral (9) au-dessous, caractérisé en ce qu'une découpe (10) s'étendant du froncement latéral (6) au froncement diagonal (3) est constituée sur le volet terminal (5), que le volet supplémentaire (11) ainsi constitué est plié ouvert avant que le volet latéral (9, 9') ne soit plié contre le volet terminal et que les secteurs de collage terminaux (7) vont du volet latéral (9, 9'), en passant par le bord intérieur (13) de la découpe et le long du bord extérieur du volet terminal (5), vers le froncement latéral (6).
EP96933453A 1995-10-10 1996-10-09 Sac hermetique Expired - Lifetime EP0958183B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI954823 1995-10-10
FI954823A FI107601B (fi) 1995-10-10 1995-10-10 Tiivistetty säkki
PCT/FI1996/000531 WO1997013698A1 (fr) 1995-10-10 1996-10-09 Sac hermetique

Publications (2)

Publication Number Publication Date
EP0958183A1 EP0958183A1 (fr) 1999-11-24
EP0958183B1 true EP0958183B1 (fr) 2003-02-19

Family

ID=8544166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96933453A Expired - Lifetime EP0958183B1 (fr) 1995-10-10 1996-10-09 Sac hermetique

Country Status (7)

Country Link
EP (1) EP0958183B1 (fr)
CZ (1) CZ292591B6 (fr)
DE (1) DE69626326T2 (fr)
ES (1) ES2193263T3 (fr)
FI (1) FI107601B (fr)
PT (1) PT958183E (fr)
WO (1) WO1997013698A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI109290B (fi) * 1997-03-18 2002-06-28 Upm Kymmene Oy Venttiilisäkki
GB2331287B (en) * 1998-02-23 1999-10-13 Phillips Westhill Limited Packaging container for loose materials

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1221614A (en) * 1916-12-21 1917-04-03 Joseph Vicknair Paper bag.
US3343748A (en) * 1966-04-25 1967-09-26 Union Carbide Corp Seal barriers for thermoplastic bags
US3439864A (en) * 1967-09-05 1969-04-22 Union Carbide Corp Sift-proof industrial bag

Also Published As

Publication number Publication date
FI954823A0 (fi) 1995-10-10
DE69626326D1 (de) 2003-03-27
WO1997013698A1 (fr) 1997-04-17
EP0958183A1 (fr) 1999-11-24
DE69626326T2 (de) 2004-03-04
CZ292591B6 (cs) 2003-10-15
CZ104998A3 (cs) 1999-06-16
FI107601B (fi) 2001-09-14
FI954823A (fi) 1997-04-11
ES2193263T3 (es) 2003-11-01
PT958183E (pt) 2003-06-30

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