EP0112660A2 - Sack mit Klemmboden - Google Patents

Sack mit Klemmboden Download PDF

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Publication number
EP0112660A2
EP0112660A2 EP83307242A EP83307242A EP0112660A2 EP 0112660 A2 EP0112660 A2 EP 0112660A2 EP 83307242 A EP83307242 A EP 83307242A EP 83307242 A EP83307242 A EP 83307242A EP 0112660 A2 EP0112660 A2 EP 0112660A2
Authority
EP
European Patent Office
Prior art keywords
sack
tape
stepped
plies
hot melt
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.)
Withdrawn
Application number
EP83307242A
Other languages
English (en)
French (fr)
Other versions
EP0112660A3 (de
Inventor
William Thomson
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.)
LIN PAC CONTAINERS INTERNATIONAL Ltd
Original Assignee
LIN PAC CONTAINERS INTERNATIONAL Ltd
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 LIN PAC CONTAINERS INTERNATIONAL Ltd filed Critical LIN PAC CONTAINERS INTERNATIONAL Ltd
Publication of EP0112660A2 publication Critical patent/EP0112660A2/de
Publication of EP0112660A3 publication Critical patent/EP0112660A3/de
Withdrawn legal-status Critical Current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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/04—Bags or like containers made of paper and having structural provision for thickness of contents with multiple walls

Definitions

  • This invention relates to a pinch bottom sack comprising a multi-wall tube with plies of paper, or other suitable material, such as a flexible plastics material, arranged at one end thereof in a stepped or staggered configuration which permits the end to be folded and closed by an adhesive to provide a strong, sift-proof seal.
  • a pinch bottom sack comprising a multi-wall tube with plies of paper, or other suitable material, such as a flexible plastics material, arranged at one end thereof in a stepped or staggered configuration which permits the end to be folded and closed by an adhesive to provide a strong, sift-proof seal.
  • a sack In its basic form, such a sack has to be cut or torn to gain access to its contents.
  • An object of the present invention is to overcome this disadvantage associated with such cold adhesive applications and to provide an easy-open, pinch bottom sack which is an improvement over the prior art sacks of this type.
  • a first aspect of the invention provides an easy-open pinch bottom sack comprising a tape which is located between the folded plies of the sack at one end thereof and which has been secured to the stepped or staggered configuration of the plies at that end of the sack by means of a hot melt adhesive, prior to the plies being folded and adhered together during manufacture of the sack.
  • the tape is impregnated with the hot melt adhesive which is re-melted immediately prior to the application of the tape to the stepped or staggered ply configuration at the one end of the multi-wall tube which is subsequently to be folded, with the folded plies themselves adhered to each other.
  • the multi-wall tube 2 and sacks 2' with respective unfolded and folded stepped paper ply ends 3,6, have double paper ply walls, although it will be appreciated that any number of paper plies may be used, depending upon the use to which the sacks 2' are to be put.
  • FIG. 3 A modified form 11 of the production line 1 shown in Fig 1, for carrying out the method according to the invention, is illustrated in Fig 3.
  • the stepped configuration 13 of each flat multi-wall tube 12 is such as to accommodate a hot melt adhesive impregnated tape 21 in a precise position to enable the paper plies to be torn accurately after the sack has been manufactured and filled, thereby providing access to its contents.
  • the tubes 12 are positioned in side-by-side relationship in the same manner as the tubes 2 in the production line 1, except that they are spaced further apart to accommodate the "tail" of the opening tape.
  • the hot melt impregnated tape 21 is fed from a spool supply 32, via a series of tensioning pulleys 33, over the surface of a heated rotating drum 34 where the adhesive impregnated in the tape 21 melts.
  • This surface of the heated drum 34 also applies the tape 21 to the underside stepped configuration 13 of each tube 12, as shown in Fig 4A, such that melted adhesive is located between the tape and corresponding paper ply.
  • a pressure wheel (not shown) urges the paper ply and tape 21 against the drum 34 to ensure the transfer of the tape to the stepped paper ply configuration 13.
  • the tape cutter 35 is preferably actuated by an electronic signal derived from a detector or probe (not shown) which monitors the arrival of each sack 12' at the cutter 35, thus catering for different widths of sack.
  • a detector or probe not shown
  • any other suitable form of actuating means may be used.
  • the cold application of adhesive, via the wheel 14, to the stepped paper ply configuration 13 may be replaced by a hot adhesive application procedure.
  • a hot adhesive application procedure it would be possible to use a single heated drum, such as that shown at 34 in Fig 3, in order to apply both the hot melt adhesive - impregnated tape 21 and the hot adhesive for the ends of the multi-wall tubes 12 simultaneously.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Sheet Holders (AREA)
EP19830307242 1982-12-21 1983-11-28 Sack mit Klemmboden Withdrawn EP0112660A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08236310A GB2132170A (en) 1982-12-21 1982-12-21 Easy-open sack
GB8236310 1982-12-21

Publications (2)

Publication Number Publication Date
EP0112660A2 true EP0112660A2 (de) 1984-07-04
EP0112660A3 EP0112660A3 (de) 1985-08-28

Family

ID=10535129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830307242 Withdrawn EP0112660A3 (de) 1982-12-21 1983-11-28 Sack mit Klemmboden

Country Status (2)

Country Link
EP (1) EP0112660A3 (de)
GB (1) GB2132170A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2276862A (en) * 1993-04-01 1994-10-12 Paper Sacks Ltd A tear strip including a synthetic material deposited in liquid form

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999023000A1 (en) * 1997-11-03 1999-05-14 Amcor Packaging (Australia) Pty. Ltd. A multi-wall sack
JP6380947B2 (ja) * 2014-02-20 2018-08-29 石川株式会社 開封容易な防湿性多層袋
JP6323944B2 (ja) * 2014-02-20 2018-05-16 石川株式会社 開封容易な通気性多層紙袋

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3565328A (en) * 1969-05-15 1971-02-23 Bemis Co Inc Multiwall pinch closure bag with opening feature
US3850366A (en) * 1971-03-11 1974-11-26 A Saito Multi-layer bags

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2276862A (en) * 1993-04-01 1994-10-12 Paper Sacks Ltd A tear strip including a synthetic material deposited in liquid form

Also Published As

Publication number Publication date
GB2132170A (en) 1984-07-04
EP0112660A3 (de) 1985-08-28

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

PUAL Search report despatched

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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19860428

RIN1 Information on inventor provided before grant (corrected)

Inventor name: THOMSON, WILLIAM