US3473725A - Seal on sacks - Google Patents

Seal on sacks Download PDF

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Publication number
US3473725A
US3473725A US715846A US3473725DA US3473725A US 3473725 A US3473725 A US 3473725A US 715846 A US715846 A US 715846A US 3473725D A US3473725D A US 3473725DA US 3473725 A US3473725 A US 3473725A
Authority
US
United States
Prior art keywords
bag
sack
walls
sealing
capping strip
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
US715846A
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English (en)
Inventor
Eric Francis Wiehahn
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.)
Fisons Pty Ltd
Original Assignee
Fisons Pty 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 Fisons Pty Ltd filed Critical Fisons Pty Ltd
Application granted granted Critical
Publication of US3473725A publication Critical patent/US3473725A/en
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
    • 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
    • B65D33/22—End- or aperture-closing arrangements or devices using adhesive applied to integral parts, e.g. to flaps using heat-activatable adhesive

Definitions

  • This invention relates to a seal on plastic sacks and bags, which is adapted to permit occluded or liberated gases or vapours to escape, and to prevent moisture from enteringr from outside, which comprises a longitudinally folded capping strip positioned over the open end of the sack or bag, with sealing lines sealing the capping strip to the walls of the sack or bag, and a further sealing line sealing the walls of the sack or bag together with an interruption at at least one point.
  • This invention relates to a seal provided on sacks and bags, preferably thermoplastic plastic sacks and bags, which is adapted to permit occluded or liberated gases or vapours to escape, and at the same time to prevent or at least hinder moisture to enter the sacks and bags from outside.
  • the invention concerns also a method of providing such a seal.
  • an open end of a tube suitable for the formation of a sack or bag is provided with a seal which comprises a capping strip folded along a fold line to present two flaps, the capping strip being positioned over the two walls of the open end of the tube forming the sack or bag with one ap on either side of the sack or bag; an internal sealing line extendingalong the length of the capping strip and spaced from the fold line and sealing the two walls of the tube forming the sack or bag together, and two external sealing lines sealing the walls to the two flaps of the capping strip; the internal sealing line being interrupted at at least one point along its length in that the two lwalls of the tube forming the sack or bag are not sealed together at that point.
  • Occluded or liberated gases and vapours inside the sack or bag can escape from the sack or bag between the walls of the sack or bag at the point of interruption of the seal, and by moving transversely along the channel space between the fold line of the capping strip and the internal sealing line to escape at the free ends of the capping strip.
  • the caliper of the sack or bag wall and the dimensions of the interrupted portion will, inter alia, determine the pressure at which occluded or liberated gases and vapours will escape.
  • the tube forming the sack or bag is preferably a tube of a thermoplastic synthetic plastic material.
  • one or both of the external sealing lines may also be interrupted at one or more points along their length, to permit the gases or vapours to escape.
  • a seal according to the invention may be provided for the closure of one or both ends of a sack or bag.
  • the internal sealing line should extend along the entire width of the open end closed thereby, with the exception of the interrupted portion or portions.
  • a sack or bag may be provided with an internal sealing line having a single interruption, it is preferred to provide two spaced interruptions, one in the proximity of either end of the internal sealing line.
  • the interruptions may be provided about 3 inches from either side. This arrangement has specific practical advantages, particularly that the sack will not seriously be weakened along the sealing line by the interruptions, if the latter are located in the proximity of the ends of the internal sealing line where the forces of strain or impact acting upon the seal are relatively small.
  • the areas may be coated with a substance having a certain degree of adherence to itself or tackiness, so that the walls will adhere to one another and will open only when the pressure inside the sack 0r bag reaches a predetermined value.
  • the invention extends also to a method of producing a seal according to the invention, which method comprises the steps of positioning a longitudinally folded capping strip over the open end of a tube suitable for forming a sack or bag so that a ap of the capping strip is positioned at either side of the sack or bag, sealing the walls of the tube forming the sack or bag and the capping strip together respectively along an internal sealing line sealing the two walls of the sack or bag together, and two external sealing lines sealing the walls to the two flaps, the sealing lines extending along the open end, and interrupting the internal sealing line at one or more points by not permitting sealing of the walls of the tube forming the sack or bag to one another at that point or those points.
  • the barrier material In practice, it has been found that certain types of printing ink can be used as the barrier material with favourable results, such as printing ink of the type normally used for printing on synthetic plastic material.
  • printing ink of the type normally used for printing on synthetic plastic material.
  • the ink which is commercially available under the trade name Coates Briteex Flexo has been been ifound to give favourable results in practice.
  • Nail varnish or certain paints may also be used as a barrier material.
  • the barrier material may also be a strip of incompatible material, such as aluminium foil, pressure sensitive cellulose adhesive tape, and the like.
  • the compatible synthetic plastic material may be applied to the walls of the sack or bag in molten state and is permitted to solidify on the walls.
  • the plastic material may thus be a so-called hot-melt material.
  • the thickness of the barrier material provided between the walls of the sack or bag and the flaps of the capping strip should be suicient to prevent the heat from reaching the interfaces of the walls of the sack or bag to seal them together.
  • the interruptions may have a length of the order of 0.3-0.8 inch. Furthermore, two spaced interruptions may be provided, one in the proximity of either end of the internal sealing line. The interruptions may be provided at those points where the forces of strain or impact acting upon the internal sealing line, are relatively small.
  • FIGURE 1 is a diagrammatic representation of the open end of a plastic sack
  • FIGURE 2 is a diagrammatic front View of the sack. embodying the seal according to the invention.
  • FIGURES 3 and 4 are diagrammatic cross-sectional views of part of the sack and capping strip, taken along line A-A in FIGURE 2, but prior to sealing and illustrating two different applications of a barrier material;
  • FIGURE 5 is a diagrammatic cross-sectional view or part of the sack and capping strip corresponding to FIGURES 3 and 4, but after sealing;
  • FIGURES 6 and 7 are diagrammatic vertical sections of part of the sack and capping strip, taken along line B--B in FIGURE 2, but prior to sealing and illustrating two different applications of a barrier material in the same manner as in FIGURES 3 and 4; and
  • FIGURE 8 is a diagrammatic vertical section of part of the sack and capping strip corresponding to FIGURES 6 and 7, but after sealing.
  • FIG. 1 illustrate diagrammatically and by wav of example, two ways in which a seal according to the invention may be provided at the open end of a plastic sack.
  • the walls 12, 14 of the open end of a sack generally indicated as 10 are provided with strips 16 of a barrier material.
  • the barrier material is applied between the interfaces of the walls l2, 14 and is incompatible printing ink of the type normally used for printing on synthetic plastic material, e.g. the printing ink commercially available under the trade name Coates Briteex Flexo, in the embodiments illustrated in FIGURES 3 and 6. It will be appreciated that the barrier material need -be applied only on one wall 14.
  • the barrier material is applied to the external faces of the walls 12, 14 and is a compatible hot-melt synthetic plastic material.
  • the barrier material should be applied to the external faces of both walls 12, i4.
  • the strips 16 are about 0.3-0.8 inch in width, preferably about 0.5 inch, and are located towards the sides of the sack 10.
  • the barrier material strips 16 prevent the walls l2. 14 to be sealed together at those points, and thus provide two interruptions 17 in the sealing line 20.
  • the interruptions 17 occur in the following manner:
  • the barrier material is incompatible with the material of the sack, and due to its physical presence prevents the walls i2, 14 to be sealed together at these points.
  • the barrier material is compatible with the material of the sack and the capping strip and thus permits the walls 12, 14 to be sealed to the capping strip iiaps 18a, 1813.
  • Occluded gases or vapors in the sack 10 are permitted to escape by passing out through the interruptions 17. and by moving transversely along the channel space 22 to escape at the free ends 24, 26 of the capping strip 18. Due to the small dimensions of the channel space 22 and the interruptions 17, and due to the length et the channel space 22, moisture is prevented or at least hindered to enter into the sack 10.
  • a plastic bag according to claim 1 in which those areas of the bag walls facing each other at a point of interruption, are coated with a tacky substance having a certain degree of adherence to itself, so that the walls will adhere to one another and will open only when the pressure inside the bag reaches a predetermined value.
  • a method of producing a seal across the open end of a seamless tube of a heat scalable synthetic plastic material to form a bag which comprises the steps of positioning a longitudinally folded capping strip of a heat sealable material over the open end of the tube forming the bag, so that a flap of the capping strip is positioned at either side of the bag, heat sealing the walls of the tube forming the bag and the capping strip together respectively along an internal sealing line sealing the walls of the bag together and two external sealing lines sealing the walls to the two flaps, the sealing lines extending along the open end and the internal sealing line being closely spaced from the fold line of the capping strip, and interrupting the internal sealing line at at least one point by coating the inside face of at least one wall of the tube at the said point prior to heat sealing with a barrier material adapted to prevent sealing of the interfaces of the walls of the tube forming the bag to one another at that point, the point being in the proximity of an end of the internal sealing line and so located that the forces of strain or impact acting upon the internal sealing line will be relatively small
  • a method of producing a seal across the open end of a tube of a heat seala'ble synthetic plastic material to form a bag which comprises the steps of positioning a longitudinally folded capping strip of a heat sealable material over the open end of the tube forming the bag, so that a flap of the capping strip is positioned at either side of the bag, heat sealing the walls of the tube forming the bag and the capping strip together respectively along an internal sealing line sealing the walls of the bag together and two external sealing lines sealing the walls to the two aps, the sealing lines extending along the open end, an interrupting the internal sealing line at at least one point by positioning a barrier material between the walls of the bag and the aps of the capping strip at the point where the interruption is required, the barrier material being adapted to prevent sealing of the interfaces of the walls of the tube forming the bag to one another at that point.
  • barrier material is adapted to serve as an insulating material to prevent the heat from sealing the walls of the bag together, during the heat sealing.
  • barrier material comprises a compatible synthetic plastics material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Packages (AREA)
US715846A 1967-03-30 1968-03-25 Seal on sacks Expired - Lifetime US3473725A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA671837 1967-03-30

Publications (1)

Publication Number Publication Date
US3473725A true US3473725A (en) 1969-10-21

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ID=25561074

Family Applications (1)

Application Number Title Priority Date Filing Date
US715846A Expired - Lifetime US3473725A (en) 1967-03-30 1968-03-25 Seal on sacks

Country Status (6)

Country Link
US (1) US3473725A (xx)
BE (1) BE712901A (xx)
DE (1) DE1761016A1 (xx)
FR (1) FR1559367A (xx)
GB (1) GB1172803A (xx)
NL (1) NL6804466A (xx)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4479923A (en) * 1982-01-12 1984-10-30 Pennzoil Company Production of phosphoric acid and additional products from phosphate ore
US4569083A (en) * 1984-02-08 1986-02-04 Basic Packaging Systems, Inc. Chain of open mouth bags
US4801078A (en) * 1986-09-16 1989-01-31 Ab Tetra Pak Arrangement on packing containers
US4971454A (en) * 1989-11-16 1990-11-20 Kcl Corporation Reclosable bag having a top closure attached to a bag body composed of multiple thermoplastic layers
US5114393A (en) * 1989-05-10 1992-05-19 B.L. Macchine Automatiche S.R.L. Method and apparatus for manufacturing sacks, and sacks obtained thereby
US5918983A (en) * 1996-11-08 1999-07-06 Control Paper Co., Inc. Security envelope
US6358545B1 (en) * 1997-07-28 2002-03-19 Mars Uk Limited Beverage-producing packages
US20040228547A1 (en) * 2002-11-08 2004-11-18 Mark Hartzell Enhanced slider zipper multiwall bag and associated methods
EP1607339A1 (de) 2004-05-27 2005-12-21 RKW AG Rheinische Kunststoffwerke Kunststoffsack mit Überdruckenlüftung
US7744139B1 (en) 1999-05-18 2010-06-29 Mars Incorporated Method for seizing rows of bag packings (pouches)
CN103979195A (zh) * 2014-05-16 2014-08-13 广西力源宝科技有限公司 包装袋

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3141601A (en) * 1960-09-06 1964-07-21 Bemis Bro Bag Co Bag top closure
US3237844A (en) * 1963-10-07 1966-03-01 Ici Ltd Bag closure
US3394871A (en) * 1966-11-25 1968-07-30 Bemis Co Inc Bags

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3141601A (en) * 1960-09-06 1964-07-21 Bemis Bro Bag Co Bag top closure
US3237844A (en) * 1963-10-07 1966-03-01 Ici Ltd Bag closure
US3394871A (en) * 1966-11-25 1968-07-30 Bemis Co Inc Bags

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4479923A (en) * 1982-01-12 1984-10-30 Pennzoil Company Production of phosphoric acid and additional products from phosphate ore
US4569083A (en) * 1984-02-08 1986-02-04 Basic Packaging Systems, Inc. Chain of open mouth bags
US4801078A (en) * 1986-09-16 1989-01-31 Ab Tetra Pak Arrangement on packing containers
US5114393A (en) * 1989-05-10 1992-05-19 B.L. Macchine Automatiche S.R.L. Method and apparatus for manufacturing sacks, and sacks obtained thereby
US4971454A (en) * 1989-11-16 1990-11-20 Kcl Corporation Reclosable bag having a top closure attached to a bag body composed of multiple thermoplastic layers
US5918983A (en) * 1996-11-08 1999-07-06 Control Paper Co., Inc. Security envelope
US6358545B1 (en) * 1997-07-28 2002-03-19 Mars Uk Limited Beverage-producing packages
US7744139B1 (en) 1999-05-18 2010-06-29 Mars Incorporated Method for seizing rows of bag packings (pouches)
US7090904B2 (en) 2002-11-08 2006-08-15 Exopack, L.L.C. Enhanced slider zipper multiwall bag and associated methods
US20040228547A1 (en) * 2002-11-08 2004-11-18 Mark Hartzell Enhanced slider zipper multiwall bag and associated methods
EP1607339A1 (de) 2004-05-27 2005-12-21 RKW AG Rheinische Kunststoffwerke Kunststoffsack mit Überdruckenlüftung
US20050281493A1 (en) * 2004-05-27 2005-12-22 Rkw Ag Rheinische Kunststoffwerke Plastic bag with overpressure relief
US7927015B2 (en) 2004-05-27 2011-04-19 Jürgen Heinemeier Plastic bag with overpressure relief
US20110188786A1 (en) * 2004-05-27 2011-08-04 Heinemeier Juergen Plastic Bag with Overpressure Relief
US8371752B2 (en) 2004-05-27 2013-02-12 Juergen Heinemeier Plastic bag with overpressure relief
CN103979195A (zh) * 2014-05-16 2014-08-13 广西力源宝科技有限公司 包装袋

Also Published As

Publication number Publication date
NL6804466A (xx) 1968-10-01
GB1172803A (en) 1969-12-03
FR1559367A (xx) 1969-03-07
DE1761016A1 (de) 1971-03-11
BE712901A (xx) 1968-07-31

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