WO2001070580A2 - Foldable inner sack - Google Patents

Foldable inner sack Download PDF

Info

Publication number
WO2001070580A2
WO2001070580A2 PCT/FI2001/000283 FI0100283W WO0170580A2 WO 2001070580 A2 WO2001070580 A2 WO 2001070580A2 FI 0100283 W FI0100283 W FI 0100283W WO 0170580 A2 WO0170580 A2 WO 0170580A2
Authority
WO
WIPO (PCT)
Prior art keywords
sack
mantle
paper
folded
removable
Prior art date
Application number
PCT/FI2001/000283
Other languages
French (fr)
Other versions
WO2001070580A3 (en
Inventor
Valter Sievers
Pentti Rikassaari
Original Assignee
Korsnäs 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 Korsnäs Ab filed Critical Korsnäs Ab
Priority to AU2001248400A priority Critical patent/AU2001248400A1/en
Publication of WO2001070580A2 publication Critical patent/WO2001070580A2/en
Publication of WO2001070580A3 publication Critical patent/WO2001070580A3/en

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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65F—GATHERING OR REMOVAL OF DOMESTIC OR LIKE REFUSE
    • B65F1/00—Refuse receptacles; Accessories therefor
    • B65F1/0006—Flexible refuse receptables, e.g. bags, sacks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65F—GATHERING OR REMOVAL OF DOMESTIC OR LIKE REFUSE
    • B65F1/00—Refuse receptacles; Accessories therefor
    • B65F1/12—Refuse receptacles; Accessories therefor with devices facilitating emptying
    • B65F1/125—Features allowing the receptacle to be lifted and emptied by its bottom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65F—GATHERING OR REMOVAL OF DOMESTIC OR LIKE REFUSE
    • B65F1/00—Refuse receptacles; Accessories therefor
    • B65F1/14—Other constructional features; Accessories
    • B65F1/1426—Housings, cabinets or enclosures for refuse receptacles
    • B65F1/1447—Housings, cabinets or enclosures for refuse receptacles located underground
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65F—GATHERING OR REMOVAL OF DOMESTIC OR LIKE REFUSE
    • B65F3/00—Vehicles particularly adapted for collecting refuse
    • B65F3/02—Vehicles particularly adapted for collecting refuse with means for discharging refuse receptacles thereinto
    • B65F3/0203—Vehicles particularly adapted for collecting refuse with means for discharging refuse receptacles thereinto with crane-like mechanisms

Definitions

  • the invention relates to paper sacks and concerns an inner sack for use in a container.
  • the inner sack of the invention can be used especially in large-sized bins comprising a removable sack, in which a product, such as refuse for instance, is collected.
  • An inner sack is placed within the removable sack with the purpose to protect the removable sack.
  • Inner sacks made of paper have also been available. These sacks have comprised two layers, and they have been made from two superposed paper webs using conventional sack production techniques. The bottom has also been a conventional flat bottom. The sack has been folded only in the transverse direction of the mantle. Such a sack has the inconvenience of being difficult to insert into the removable sack.
  • the inner sack defined in claim 1 has now been invented. A number r embodiments of the invention are described in the other claims.
  • the inner sack is first folded at least once in the longitudinal direction of the mantle, and then preferably at least once more in the transverse direction of the mantle.
  • Such a sack is easy to insert into the removable sack, and it opens up there readily.
  • the sack is preferably folded several times in the longitudinal direction, e.g. three times, with the successive folds ranning in different directions so that pleats are formed.
  • the sack is preferably folded several times, e.g. five times, in the transverse direction as well.
  • the height of the sack may be e.g. 2-4 m and its width e.g. 0.5-2 m.
  • the height of the sack is preferably slightly above that of the container to be used, so as to allov ⁇ for a fastening and closing margin at the mouth of the sack.
  • the sack is preferably also slightly wider than the container to be used, so that no transverse stresses are exerted on the sack during filling.
  • the sack bottom is preferably closed with a straight transverse joint. In this way, the bottom will not interfere with the folding of the sack.
  • the sack is given enough height to allow the bottom to spread well in the container without the bottom joint being exposed to high stress.
  • the sack bottom is closed with a transverse joint by bonding the inner surface of the front face of the mantle to the inner surface of the back face. This provides as straightforward production as possible. In addition, the bottom joint will not cause any additional thickness in the folded sack.
  • the sack may be made of several paper webs, such as for instance two webs.
  • a method of producing such a laterally pleated sack is described in Patent Application FI-A 920575. In this way sack production lines with normal width can be used for the production of a wide sack.
  • the sack is made of several paper webs by bonding the inner surface of a paper strip to the inner surface of a second paper strip. This provides as straightforward production as possible, and the folded sack will not have any excess thickness.
  • the sack preferably comprises one single layer.
  • Wet-strength Kraft paper can especially be used in the production.
  • a suitable thickness is e.g. in the range 50- 90 g/m 2 . The thickness is selected according to the purpose of use, so that the sack will remain unbroken in the container and during the transport to the waste treatment plant. After this, it is usually preferable that the sack decomposes and decays rapidly.
  • the sack may also comprise a separate moisture barrier layer.
  • the barrier layer is preferably also made of a degradable material.
  • the degradable material may contain modified starch, associated with additional synthetic polymer for instance in the way described in Patent Application FI-A 915539.
  • figure 1 shows an sack of the invention in unfolded state
  • figure 2 shows the sack folded in the longitudinal direction
  • figure 3 shows the sack folded also in the transverse direction
  • figure 4 shows how a removable sack is lowered into a container
  • figure 5 shows how the inner sack is inserted into the removable sack placed within the container.
  • the sack 1 shown in figure 1 has been made of two approx. 1.2*2.8 m paper strips by posing them on top of each other and glueing their edges together with lateral joints 2 and 3, and by closing the lower end with a bottom joint 4 to form the bottom 5.
  • the mouth 6 is open.
  • the lateral joints start at approx. 1.5-2 cm from the edge, and they have a width of approx. 1-2 cm.
  • the bottom joint starts at approx. 2- 4 cm from the bottom, and it has a width of approx. 3-5 cm.
  • the paper is wet- strength sack paper with a thickness of approx. 50-70 g/m .
  • the sack 1 has been folded three times.
  • the longitudinally pleated sack thus obtained has been further pleated in the transverse direction to form a transversely pleated sack.
  • the mouth 6 is on the top and the bottom 5 is folded inwards.
  • the sack 1 can be used as an inner sack in a removable sack 7 in a container 8.
  • the removable sack can be opened at the bottom, allowing the filled inner sack to be dropped out from below.
  • Figure 4 shows how the bottom of the emptied removable sack is closed again and lowered into the container, a major portion of which is located underground.
  • the pleated inner sack 1 is inserted into the removable sack placed in the container, and the mouth of the inner sack is fastened to the upper end of the removable sack.
  • the upper end of the pleated inner sack will open up immediately and definitely under the force of material dropped into the container.

Abstract

The invention relates to an inner sack of paper, comprising a mantle in the shape of a flattened tube, whose one end is closed to form the bottom and other end has an open mouth. The sack (1) is folded at least once in the longitudinal direction of the mantle, and then preferably at least once more in the transverse direction of the mantle. The inner sack can be used for instance inside a removable sack in containers used for refuse collection. The inner sack of the invention is easy to insert into the removable sack and it opens up readily in this.

Description

INNER SACK
Technological background
The invention relates to paper sacks and concerns an inner sack for use in a container. The inner sack of the invention can be used especially in large-sized bins comprising a removable sack, in which a product, such as refuse for instance, is collected. An inner sack is placed within the removable sack with the purpose to protect the removable sack.
Nowadays large-sized underground containers are increasingly used for refuse collection, with a removable sack made of high-strength plastic fabric inside the containers. The bottom of the removable sack is closed with a string in such a way that it can be opened. Inside the removable sack, there is a disposable inner sack protecting the removable sack. The container is emptied by removing the removable sack from the container, transferring it to the platform of the garbage truck and by opening the sack bottom, so that the inner sack with its contents drops on the platform. The inner sack continues to protect the platform and the environment during the transport. When emptied, the bottom of the removable sack is closed, the removable sack is returned into the container and an inner replacement sack j; inserted in it.
In the removable sacks described above, inner sacks made of degradable plastic are used. Such a plastic sack is very expensive, and in addition, current sacks often start decomposing in the container, since the collection intervals may be quite long.
Inner sacks made of paper have also been available. These sacks have comprised two layers, and they have been made from two superposed paper webs using conventional sack production techniques. The bottom has also been a conventional flat bottom. The sack has been folded only in the transverse direction of the mantle. Such a sack has the inconvenience of being difficult to insert into the removable sack.
Description of the invention
The inner sack defined in claim 1 has now been invented. A number r embodiments of the invention are described in the other claims. According to a first feature of the invention, the inner sack is first folded at least once in the longitudinal direction of the mantle, and then preferably at least once more in the transverse direction of the mantle. Such a sack is easy to insert into the removable sack, and it opens up there readily. The sack is preferably folded several times in the longitudinal direction, e.g. three times, with the successive folds ranning in different directions so that pleats are formed. The sack is preferably folded several times, e.g. five times, in the transverse direction as well.
The height of the sack may be e.g. 2-4 m and its width e.g. 0.5-2 m. The height of the sack is preferably slightly above that of the container to be used, so as to allov^ for a fastening and closing margin at the mouth of the sack. The sack is preferably also slightly wider than the container to be used, so that no transverse stresses are exerted on the sack during filling.
The sack bottom is preferably closed with a straight transverse joint. In this way, the bottom will not interfere with the folding of the sack. The sack is given enough height to allow the bottom to spread well in the container without the bottom joint being exposed to high stress.
According to a second independent feature of the invention, the sack bottom is closed with a transverse joint by bonding the inner surface of the front face of the mantle to the inner surface of the back face. This provides as straightforward production as possible. In addition, the bottom joint will not cause any additional thickness in the folded sack.
The sack may be made of several paper webs, such as for instance two webs. A method of producing such a laterally pleated sack is described in Patent Application FI-A 920575. In this way sack production lines with normal width can be used for the production of a wide sack.
According to a third independent feature of the invention, the sack is made of several paper webs by bonding the inner surface of a paper strip to the inner surface of a second paper strip. This provides as straightforward production as possible, and the folded sack will not have any excess thickness.
The sack preferably comprises one single layer. Wet-strength Kraft paper can especially be used in the production. A suitable thickness is e.g. in the range 50- 90 g/m2. The thickness is selected according to the purpose of use, so that the sack will remain unbroken in the container and during the transport to the waste treatment plant. After this, it is usually preferable that the sack decomposes and decays rapidly.
The sack may also comprise a separate moisture barrier layer. The barrier layer is preferably also made of a degradable material. The degradable material may contain modified starch, associated with additional synthetic polymer for instance in the way described in Patent Application FI-A 915539.
A number of embodiments of the invention are disclosed in detail below. The accompanying drawings pertain to the disclosure. In the drawings
figure 1 shows an sack of the invention in unfolded state figure 2 shows the sack folded in the longitudinal direction, figure 3 shows the sack folded also in the transverse direction, figure 4 shows how a removable sack is lowered into a container and figure 5 shows how the inner sack is inserted into the removable sack placed within the container.
The sack 1 shown in figure 1 has been made of two approx. 1.2*2.8 m paper strips by posing them on top of each other and glueing their edges together with lateral joints 2 and 3, and by closing the lower end with a bottom joint 4 to form the bottom 5. The mouth 6 is open. The lateral joints start at approx. 1.5-2 cm from the edge, and they have a width of approx. 1-2 cm. The bottom joint starts at approx. 2- 4 cm from the bottom, and it has a width of approx. 3-5 cm. The paper is wet- strength sack paper with a thickness of approx. 50-70 g/m .
As shown in figure 2, the sack 1 has been folded three times. The longitudinally pleated sack thus obtained has been further pleated in the transverse direction to form a transversely pleated sack. Here the mouth 6 is on the top and the bottom 5 is folded inwards.
The sack 1 can be used as an inner sack in a removable sack 7 in a container 8. The removable sack can be opened at the bottom, allowing the filled inner sack to be dropped out from below. Figure 4 shows how the bottom of the emptied removable sack is closed again and lowered into the container, a major portion of which is located underground. The pleated inner sack 1 is inserted into the removable sack placed in the container, and the mouth of the inner sack is fastened to the upper end of the removable sack. The upper end of the pleated inner sack will open up immediately and definitely under the force of material dropped into the container.

Claims

Claims
1. A paper inner sack with a mantle in the shape of a flattened tube, whose one end is closed to form a bottom and other end has an open mouth, characterised in that the sack (1) is folded at least once in the longitudinal direction of the mantle.
2. An inner sack as defined in claim 1, in which the sack (1) is folded several times in the longitudinal direction, preferably pleat-like.
3. An inner sack as defined in claim 1 or 2, in which the sack (1) is folded at least once, preferably several times, in the transverse direction as well.
4. An inner sack as defined in any of claims 1-3, in which the bottom (5) of the sack (1) has a transverse straight bottom joint (4).
5. An inner sack as defined in claim 4, in which the inner surface of the mantle bears against the inner surface in the bottom joint (4) of the bottom.
6. An inner sack as defined in any of claims 1-5, in which the mantle comprises two or more, preferably two, paper strips joined by lateral joints (2, 3) at their edges.
7. An inner sack as defined in claim 6, in which the inner surface of the mantle bears against the inner surface in the lateral joint (2, 3).
8. An inner sack as defined in claim 5 or 7, in which the bottom joint (4) or the lateral joint (2, 3) starts at a distance from the edge of the bottom or the edge of the paper strip.
9. A method for producing an inner sack of paper, in which the sack mantle is formed of a paper tube, whose one end is closed to form the bottom, characterised in that the mantle of the sack is first folded at least once in the longitudinal direction and then at least once in the transverse direction.
10. Use of the inner sack according to any of claims 1-8 or the sack produced according to claim 9 in a removable sack.
PCT/FI2001/000283 2000-03-22 2001-03-21 Foldable inner sack WO2001070580A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001248400A AU2001248400A1 (en) 2000-03-22 2001-03-21 Inner sack

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20000669 2000-03-22
FI20000669A FI20000669A (en) 2000-03-22 2000-03-22 inside Sack

Publications (2)

Publication Number Publication Date
WO2001070580A2 true WO2001070580A2 (en) 2001-09-27
WO2001070580A3 WO2001070580A3 (en) 2002-02-07

Family

ID=8558002

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2001/000283 WO2001070580A2 (en) 2000-03-22 2001-03-21 Foldable inner sack

Country Status (3)

Country Link
AU (1) AU2001248400A1 (en)
FI (1) FI20000669A (en)
WO (1) WO2001070580A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2380824A1 (en) * 2010-04-21 2011-10-26 Compagnie Plastic Omnium Protection of a top edge of a subterranean or semi-burried container intended for holding a refuse collecting receptacle

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE639881A (en) *
US1484606A (en) * 1922-09-27 1924-02-19 George B Hanford Receptacle and lining therefor
US1488203A (en) * 1922-08-15 1924-03-25 James Q Horne Sanitary lining for garbage cans
US3226015A (en) * 1964-07-09 1965-12-28 Union Bag Camp Paper Corp Waste receptacle
US3380646A (en) * 1962-11-14 1968-04-30 Leon Doyen Container of plastic material and method of producing same
NO145229B (en) * 1977-02-16 1981-11-02 Karl H Hoeie FOLDABLE AND SUSTAINABLE, UPDATE AAPEN CONTAINER FOR LIQUID, RELIABLE WATER.
US4461031A (en) * 1981-03-10 1984-07-17 Bagcraft Corporation Of America Tubular bag and method of making the same
US4628535A (en) * 1982-03-01 1986-12-09 Windmoller & Holscher Large sack comprising a double-walled outer sack and an inserted inner sack
WO1988009752A1 (en) * 1987-06-03 1988-12-15 Yhtyneet Paperitehtaat Oy Method for placing a sack into a stand and removing out of it
GB2256185A (en) * 1991-05-30 1992-12-02 Bagcraft Corp Window bag assembly with content indicia
DE4303341A1 (en) * 1992-02-11 1993-08-12 Yhtyneet Paperitehtaat Oy Inner paper bag for inserting into collecting containers - has several inwardly folded gussets on each opposite foldable side
US5741208A (en) * 1996-10-15 1998-04-21 Industrial Transportation, Inc. Environmental container liner and method of manufacture

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE639881A (en) *
US1488203A (en) * 1922-08-15 1924-03-25 James Q Horne Sanitary lining for garbage cans
US1484606A (en) * 1922-09-27 1924-02-19 George B Hanford Receptacle and lining therefor
US3380646A (en) * 1962-11-14 1968-04-30 Leon Doyen Container of plastic material and method of producing same
US3226015A (en) * 1964-07-09 1965-12-28 Union Bag Camp Paper Corp Waste receptacle
NO145229B (en) * 1977-02-16 1981-11-02 Karl H Hoeie FOLDABLE AND SUSTAINABLE, UPDATE AAPEN CONTAINER FOR LIQUID, RELIABLE WATER.
US4461031A (en) * 1981-03-10 1984-07-17 Bagcraft Corporation Of America Tubular bag and method of making the same
US4628535A (en) * 1982-03-01 1986-12-09 Windmoller & Holscher Large sack comprising a double-walled outer sack and an inserted inner sack
WO1988009752A1 (en) * 1987-06-03 1988-12-15 Yhtyneet Paperitehtaat Oy Method for placing a sack into a stand and removing out of it
GB2256185A (en) * 1991-05-30 1992-12-02 Bagcraft Corp Window bag assembly with content indicia
DE4303341A1 (en) * 1992-02-11 1993-08-12 Yhtyneet Paperitehtaat Oy Inner paper bag for inserting into collecting containers - has several inwardly folded gussets on each opposite foldable side
US5741208A (en) * 1996-10-15 1998-04-21 Industrial Transportation, Inc. Environmental container liner and method of manufacture

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2380824A1 (en) * 2010-04-21 2011-10-26 Compagnie Plastic Omnium Protection of a top edge of a subterranean or semi-burried container intended for holding a refuse collecting receptacle
FR2959219A1 (en) * 2010-04-21 2011-10-28 Plastic Omnium Cie PROTECTION OF AN UPPER EDGE OF A BURIED OR SEMI-BOUNDED TANK INTENDED TO RECEIVE A WASTE COLLECTION CONTAINER

Also Published As

Publication number Publication date
FI20000669A (en) 2001-09-23
WO2001070580A3 (en) 2002-02-07
FI20000669A0 (en) 2000-03-22
AU2001248400A1 (en) 2001-10-03

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