EP1055608A1 - Siegel für Beutel - Google Patents

Siegel für Beutel Download PDF

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Publication number
EP1055608A1
EP1055608A1 EP00304275A EP00304275A EP1055608A1 EP 1055608 A1 EP1055608 A1 EP 1055608A1 EP 00304275 A EP00304275 A EP 00304275A EP 00304275 A EP00304275 A EP 00304275A EP 1055608 A1 EP1055608 A1 EP 1055608A1
Authority
EP
European Patent Office
Prior art keywords
seal
bag
interruption
sack
venting
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Withdrawn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
EP00304275A
Other languages
English (en)
French (fr)
Inventor
Donald Charles Lack
David Wrightson
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.)
British Polythene Ltd
Original Assignee
British Polythene 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 British Polythene Ltd filed Critical British Polythene Ltd
Publication of EP1055608A1 publication Critical patent/EP1055608A1/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Withdrawn legal-status Critical Current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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/01—Ventilation or drainage of bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure

Definitions

  • the present invention relates to a seal for sacks or bags, and relates particularly, but not exclusively to seals for plastic sacks and bags.
  • Some products which are packaged in sacks produce gases which need to be vented. If such gases are not vented the pressure build up in sacks can lead to damage of the product or rupture of the sack.
  • vents allow gases produced by the product contained within the bag, to escape.
  • vents allow the product immediately adjacent to the vents to come into direct contact with the air outside the sack. This air may be relatively moist when compared to the air inside the sack. In these circumstances the product, particularly that adjacent to the vent, may absorb some of this moisture, potentially having a detrimental effect upon the stored product.
  • vents may allow fines or very small particles of a particulate product a very short direct path, through the vent, through which they can easily escape.
  • vents create points of weakness in the seal. These points of weakness may lead to splitting of the sack or enlargement of the venting holes and to the product escaping or at least exacerbation of the above described problems.
  • venting holes For very hydroscopic products it may be necessary to maintain closure of the venting holes until a specific internal pressure has been created by the product. In the above described venting bag the venting holes remain in an open condition irrespective of whether an internal pressure has built up or not. In the absence of any internal pressure, moist air is able to enter the sack through the venting holes.
  • Preferred embodiments of the present invention seek to overcome the above disadvantages of the prior art.
  • a seal for a bag comprising:
  • the interruption in the first and second seals may comprise a hole in the seal.
  • the interruptions are provided to, on occasion, vent excess pressure from the inside of the bag.
  • the outer line of seal also provides structural support for the weakness created by the venting holes in the first seal. This support is further enhanced by the offsetting of the venting holes.
  • two lines of seal containing offset venting holes also removes the short and direct pathway for fine particulate product from within the sack to escape, therefore decreasing losses of the product through the venting holes.
  • a surprising advantage of the two adjacent lines of seal is that for certain thicknesses of plastic sheet film, combined with certain distances between the adjacent first and second lines of seal and certain sizes of venting holes, when a product is contained within the bag, the pathway from the venting holes in the first line of seal to the venting holes in the second line of seal remains closed, even to the passage of air, until a sufficient internal pressure has been built. When such a pressure has been created the pathway between the venting holes can open, to vent the excess gas, and re-closes once the pressure is reduced. As a result the product contained within the bag can be almost completely protected from incursion of moisture and loss of product through the venting system, whilst the venting properties of the seal are maintained.
  • the pressure at which the pathway between the venting holes opens can be controlled by varying the thickness and/or flexibility of the material from which the bag is made, the distance between the first and second lines of seal, the size of the venting holes and the distance between the venting holes.
  • a bag can be sealed to create a venting seal with the above described advantages.
  • apparatus for forming a seal for a bag comprising:-
  • a bag having at least one seal according to the first aspect of the present invention.
  • Figure 1 is a schematic representation of a sack having a seal embodying an aspect of the present invention.
  • Figure 2 is a front view of part of seal forming apparatus embodying an aspect of the present invention.
  • Figure 3 is a bottom view of the part of the seal forming apparatus of Figure 2.
  • Figure 4 is a side view of the part of the seal forming apparatus of Figure 2.
  • a sack 10 comprising a first sheet of plastic 12 and a second sheet of plastic 14 (not shown). Three sides of said sack are sealed by non-venting seals 16.
  • the seal for the fourth side of sack 10 comprises first line of seal 18 with venting holes 20 and second line of seal 22 with venting holes 24. Venting holes 20 in first line of seal 18 are offset relative to venting holes 24 of second line of seal 22.
  • the bonds between sheets of plastic 12 and 14 may be formed by the known technique of mechanically applying heated metal bars to the plastic films 12 and 14.
  • the vent holes in first and second lines of seal 18 and 22 are produced by gaps in said heated metal bars.
  • a typical plastic film for producing such a sack is a polyolefin film.
  • a heated sealing bar 30 comprising a first sealing bar 32 having gaps 34, and second sealing bar 36 having gaps 38.
  • Heated sealing bar 30 is constructed such that gaps 34 of first sealing bar 32 are offset relative to gaps 38 of second sealing bar 36.
  • Heated sealing bar 30 works in cooperation with a second heated sealing bar (not shown) such that the first sealing bars 32 of the pair of heated sealing bars 30 meet to form the first seal, and the second sealing bars 36 of the pair of heated sealing bars 30 meet to form the second seal.
  • the gaps 34 in the pair of first sealing bars 32 are aligned such that when plastic sheets 12 and 14 are placed between the pair of heated sealing bars 30 and pressure is applied between them they produce a seal with venting holes 20 in the first seal 18.
  • the gaps 38 in the pair of sealing bars 36 are also aligned such that when plastic sheets 12 and 14 are placed between the pair of heated sealing bars 30 and pressure is applied between them they produce a seal with venting holes 24 in the second seal 22.
  • sealing bar 30 The temperature to which sealing bar 30 is heated, the pressure applied and duration of contact required to bond the plastic sheets are all dependent upon the plastic used in the film and the thickness of the film.
  • the sack may be constructed from a tube of plastic film which is sealed at the ends.
  • a sack manufacturer When supplying such sacks it is commonplace for a sack manufacturer to form a sack from such a tube and seal one end, for the purposes of this invention with a venting seal, so that the product supplier can fill the sack and apply a non-venting seal to the other end.
  • venting seal maybe used along more than one edge of the bag

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
EP00304275A 1999-05-21 2000-05-19 Siegel für Beutel Withdrawn EP1055608A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9911813.5A GB9911813D0 (en) 1999-05-21 1999-05-21 A seal for a sack or bag
GB9911813 1999-05-21

Publications (1)

Publication Number Publication Date
EP1055608A1 true EP1055608A1 (de) 2000-11-29

Family

ID=10853870

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00304275A Withdrawn EP1055608A1 (de) 1999-05-21 2000-05-19 Siegel für Beutel

Country Status (2)

Country Link
EP (1) EP1055608A1 (de)
GB (1) GB9911813D0 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009114369A1 (en) 2008-03-07 2009-09-17 The Procter & Gamble Company Package for granular compositions
WO2011023692A1 (de) * 2009-08-25 2011-03-03 Basf Se Ökologische papierverpackung für langzeit-insektizid ausgerüstete moskitonetze
CN106829162A (zh) * 2016-12-30 2017-06-13 武汉华星光电技术有限公司 一种防静电袋

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE779679A (en) * 1971-02-23 1972-08-22 Kanegafuchi Chemical Ind Plastic bag - with passage for escape of air between two or more layers of strips sealed discontinuously to bag
US4761197A (en) * 1986-07-28 1988-08-02 Baxter Travenol Laboratories, Inc. Apparatus for sealing a web of film
US4834554A (en) * 1987-11-16 1989-05-30 J. C. Brock Corp. Plastic bag with integral venting structure
GB2237553A (en) * 1989-10-25 1991-05-08 Robert John Hunt Plastic bags with gas venting means
JPH03168030A (ja) * 1989-11-28 1991-07-19 Nagano Kida Kogyo Kk きのこ栽培用袋の開口部封止方法
JPH05255331A (ja) 1991-10-17 1993-10-05 Merck & Co Inc Ｍｒｓａ活性２−ハロフェニルカルバペネム

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE779679A (en) * 1971-02-23 1972-08-22 Kanegafuchi Chemical Ind Plastic bag - with passage for escape of air between two or more layers of strips sealed discontinuously to bag
US4761197A (en) * 1986-07-28 1988-08-02 Baxter Travenol Laboratories, Inc. Apparatus for sealing a web of film
US4834554A (en) * 1987-11-16 1989-05-30 J. C. Brock Corp. Plastic bag with integral venting structure
GB2237553A (en) * 1989-10-25 1991-05-08 Robert John Hunt Plastic bags with gas venting means
JPH03168030A (ja) * 1989-11-28 1991-07-19 Nagano Kida Kogyo Kk きのこ栽培用袋の開口部封止方法
JPH05255331A (ja) 1991-10-17 1993-10-05 Merck & Co Inc Ｍｒｓａ活性２−ハロフェニルカルバペネム

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 015, no. 409 (C - 0876) 18 October 1991 (1991-10-18) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009114369A1 (en) 2008-03-07 2009-09-17 The Procter & Gamble Company Package for granular compositions
WO2011023692A1 (de) * 2009-08-25 2011-03-03 Basf Se Ökologische papierverpackung für langzeit-insektizid ausgerüstete moskitonetze
CN102596751A (zh) * 2009-08-25 2012-07-18 巴斯夫欧洲公司 用于经长效杀虫剂处理的蚊帐的生态纸包装件
CN102596751B (zh) * 2009-08-25 2014-12-31 巴斯夫欧洲公司 用于经长效杀虫剂处理的蚊帐的生态纸包装件
CN106829162A (zh) * 2016-12-30 2017-06-13 武汉华星光电技术有限公司 一种防静电袋

Also Published As

Publication number Publication date
GB9911813D0 (en) 1999-07-21

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