EP0279632A2 - Sac pouvant être fermé - Google Patents

Sac pouvant être fermé Download PDF

Info

Publication number
EP0279632A2
EP0279632A2 EP88301282A EP88301282A EP0279632A2 EP 0279632 A2 EP0279632 A2 EP 0279632A2 EP 88301282 A EP88301282 A EP 88301282A EP 88301282 A EP88301282 A EP 88301282A EP 0279632 A2 EP0279632 A2 EP 0279632A2
Authority
EP
European Patent Office
Prior art keywords
bag
strip
sheet material
silicone
open end
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Withdrawn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
EP88301282A
Other languages
German (de)
English (en)
Other versions
EP0279632A3 (fr
Inventor
Paul Richard Baldwin
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.)
INTERPOLY Ltd
Original Assignee
INTERPOLY 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
Priority claimed from GB878703508A external-priority patent/GB8703508D0/en
Priority claimed from GB878726038A external-priority patent/GB8726038D0/en
Application filed by INTERPOLY Ltd filed Critical INTERPOLY Ltd
Publication of EP0279632A2 publication Critical patent/EP0279632A2/fr
Publication of EP0279632A3 publication Critical patent/EP0279632A3/fr
Withdrawn legal-status Critical Current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
    • B65D33/16—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
    • B65D33/20—End- or aperture-closing arrangements or devices using adhesive applied to integral parts, e.g. to flaps using pressure-sensitive adhesive

Definitions

  • This invention relates to bags of sheet material such as paper and/or plastics which can be closed after use prior to disposal.
  • the invention is particularly directed to disposable bags used for example for travel sickness, although the bags can be used for other purposes, such as refuse disposal or for storage purposes.
  • travel sickness bags have been proposed with a strip of adhesive protected by a peelable cover strip adjacent the top of the bag, thus allowing the bag to be folded over onto the adhesive after removal of the peelable cover strip, such bags do not give a satisfactory sealing of the mouth of the bag. Furthermore such strips of adhesive can only be conveniently applied in a continuous process to bags having side welds, optionally with a bottom gusset, and such side welded bags do not present a satisfactory wide open mouth for use by a person afflicted with travel sickness.
  • the present invention seeks to provide an improved closable bag, and a convenient method for manufacture of such bags.
  • a bag of sheet material having a seal at one end thereof, side gussets and an open end
  • the bag having a closure strip of sheet material having a first portion secured across one outer face of the bag and a second portion overlying said face adjacent the open end of the bag, said second portion carrying pressure sensitive adhesive and said overlaid area of said face carrying a layer of silicone so that said pressure sensitive adhesive adheres temporarily to the overlaid area to allow the open end of the bag to be folded so that the edges underlie and are sealed by said second portion.
  • the closure strip is so positioned on the outer face of the bag that, after the open end of the bag is folded under said second portion, the second portion extends beyond the fold so that it can be turned over around the fold.
  • the entire closure strip carries pressure sensitive adhesive on its underside.
  • the bag may be of plastics material such as high density polyethylene. Alternatively it may be of paper or plastics - coated paper dependent on the intended use of the bag.
  • the bag conveniently carries printed matter on the face of the bag and/or the closure strip.
  • the printed matter suitably comprises instructions for use and includes a fold line adjacent the open end of the bag positioned to bring the edges of the bag beneath the second portion of the closure strip.
  • a method of manufacturing bags as defined above comprising supplying surface treated sheet material in laid flat tube form, before or after formation of said gussets and/or said end seals, to a coating station, coating selected areas of the film with a silicone layer and curing the silicone, supplying said coated film to a labelling station, supplying said closure strips to said labelling station carried on a peelable backing strip, removing said peelable backing strip and securing part of each closure strips to an uncoated portion of the sheet material at suitably spaced locations adjacent a coated area in such a way that the other part of the strip overlies the coated area.
  • the closure strips may be secured to the sheet material by means of air pressure blowing or other suitable means.
  • the invention also extends to a method of applying a silicone release layer to a plastics material including the steps of:
  • Figure 1 shows a bag 1, of plastics material such as high density polyethylene, which has a welded end seal 2 at one end and an opposite open end 3 and side gussets, the extremities of which are indicated by dotted lines 4.
  • the outer face of the bag carries any desired printing matter at 5 and also an indication 6 of a fold line adjacent the open end 3.
  • a cover strip 8 is attached to the outer face of one side of the bag via a first portion 9, secured to the bag across its entire width.
  • the second, unsecured portion 10 of the cover strip 8 overlies a co-extensive adjacent area of the bag which is coated with silicone.
  • the portion 10 carries on its underside a layer of pressure sensitive adhesive, but the layer is prevented from permanently adhering to the bag by the silicone layer.
  • the front of cover strip 8 suitably carries instructions for use.
  • the bag as described above can be conveniently manufactured from a continuous tube of plastics material, which may be preformed with end welds 2 and side gussets.
  • the material is pre-treated usually during manufacture by subjecting its surface by corona discharge to a level of 32 dynes/cm2. Immediately before printing further discharge is applied to boost the level to 50 dynes/cm2 (the level is likely to have fallen to about 25 dynes/cm2 during storage in any case). The material then passes into the print unit.
  • a silicone layer is then applied to the film in selected areas to prevent the closure strip from permanently adhering to these areas, the silicone liquid having been previously blended with a catalytic photo-initiator. This renders it unstable so that it can be applied to the film surface in an even layer at the rate of one gram/m2.
  • the silicone is then cured by passing the film across a source of UV radiation at a rate of 250 watts per linear inch and a web speed of 60 metres/min. The curing process is assisted by the presence of a nitrogen blanket which serves as a catalyst.
  • the material is then supplied to a labelling station to which is also supplied, a supply of separate closure strips 8 mounted on a continuous peelable backing strip 12 as shown in Figure 2.
  • means such as knife means, are used to lift strips 8 from the peelable backing thus revealing the pressure sensitive adhesive on the underside.
  • the portions 9 then contact and attach themselves to the tube of plastics material at the desired locations, and may be assisted by air pressure blowing the portions onto the face of the tube. Portions 10 overlie the bag, and are prevented from permanently bonding to it by the silicone layer.
  • the peelable backing strip may carry additional score lines which enable a part of the backing strip to be left on the closure strip when it is applied to the web, so that in use, the part of the backing strip must be peeled off by the user, before the closure can be effected.
  • Any remaining steps in bag manufacture including, for example, printing, gusseting, end seal formation and securing of the bags, can then be carried out.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Making Paper Articles (AREA)
EP88301282A 1987-02-16 1988-02-16 Sac pouvant être fermé Withdrawn EP0279632A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB878703508A GB8703508D0 (en) 1987-02-16 1987-02-16 Closable bag
GB8703508 1987-02-16
GB878726038A GB8726038D0 (en) 1987-11-06 1987-11-06 Closable bag
GB8726038 1987-11-06

Publications (2)

Publication Number Publication Date
EP0279632A2 true EP0279632A2 (fr) 1988-08-24
EP0279632A3 EP0279632A3 (fr) 1989-12-06

Family

ID=26291910

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88301282A Withdrawn EP0279632A3 (fr) 1987-02-16 1988-02-16 Sac pouvant être fermé

Country Status (3)

Country Link
EP (1) EP0279632A3 (fr)
DE (1) DE279632T1 (fr)
ES (1) ES2004485A4 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0315327A3 (en) * 1987-11-05 1990-05-02 Moore Business Forms, Inc. Improvements in business forms assemblies
US7651290B2 (en) 2005-05-09 2010-01-26 Kimberly-Clark Worldwide, Inc. Device with pull tab activation
US7950864B2 (en) 2005-12-13 2011-05-31 Kimberly-Clark Worldwide, Inc. Device with internal pull tab activation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH325095A (de) * 1953-01-15 1957-10-31 Hesser Ag Maschf Beutel mit Verschluss in Form eines das Beutelende dachförmig verschliessenden Streifens
GB2039250B (en) * 1979-01-12 1983-07-20 Metal Closures Venus Pack Apparatus for producing bags of plastics material
US4402453A (en) * 1981-06-25 1983-09-06 Arvey Corporation Pouch with closure seal strip and method for making same
US4417658A (en) * 1982-03-22 1983-11-29 Surgicot, Inc. Self-sealing sterilization bag
GB8322885D0 (en) * 1983-08-25 1983-09-28 Sanders B Containers
GB2163698B (en) * 1984-08-16 1989-02-22 Henry & Co Ltd A & S Paper sack

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0315327A3 (en) * 1987-11-05 1990-05-02 Moore Business Forms, Inc. Improvements in business forms assemblies
US7651290B2 (en) 2005-05-09 2010-01-26 Kimberly-Clark Worldwide, Inc. Device with pull tab activation
US7950864B2 (en) 2005-12-13 2011-05-31 Kimberly-Clark Worldwide, Inc. Device with internal pull tab activation

Also Published As

Publication number Publication date
ES2004485A4 (es) 1989-01-16
EP0279632A3 (fr) 1989-12-06
DE279632T1 (de) 1989-02-16

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