EP0002326A1 - Sac à valve et son procédé de fabrication - Google Patents

Sac à valve et son procédé de fabrication Download PDF

Info

Publication number
EP0002326A1
EP0002326A1 EP78300626A EP78300626A EP0002326A1 EP 0002326 A1 EP0002326 A1 EP 0002326A1 EP 78300626 A EP78300626 A EP 78300626A EP 78300626 A EP78300626 A EP 78300626A EP 0002326 A1 EP0002326 A1 EP 0002326A1
Authority
EP
European Patent Office
Prior art keywords
aperture
sack
tube
gusset
sealing
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Withdrawn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
EP78300626A
Other languages
German (de)
English (en)
Inventor
Harry Fleeman Hardwick
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.)
Harwell Packaging Ltd
Original Assignee
FLEEMAN-HARDWICK Harry
Harwell Packaging 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 GB48814/77A external-priority patent/GB1590326A/en
Application filed by FLEEMAN-HARDWICK Harry, Harwell Packaging Ltd filed Critical FLEEMAN-HARDWICK Harry
Priority to GB7845758A priority Critical patent/GB2044729A/en
Publication of EP0002326A1 publication Critical patent/EP0002326A1/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Withdrawn legal-status Critical Current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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/14—Valve bags, i.e. with valves for filling
    • 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
    • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
    • 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
    • B31B2160/00—Shape of flexible containers
    • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
    • 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
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/84—Forming or attaching means for filling or dispensing contents, e.g. valves or spouts
    • B31B70/844—Applying rigid valves, spouts, or filling tubes

Definitions

  • the invention relates to valve sacks.
  • valve bags or sacks from paper, polythene and the like in so-called block bottom style.
  • the flat tube of material which forms the bag is folded and.sealed, across its length, at each end but at one end a valve is incorporated in the folds.
  • the valve is a flat tube of paper, polythene or the like which allows access through the folds into the bag.
  • the initially flat tube of film is gusseted along its opposed longitudinal edges, and secondly, the film is sealed across its . length but the sealed regions define the sides, not the ends, of the finished bag.
  • Arrow A indicates the direction of feed of a longitudinally continuous gusseted tube.
  • slits are made in the base of one of the gussets. This slitting is performed by a thin blade (not shown) lying flat within one of the gussets so that the film normally slides past it. At intervals, the blade is pushed deeper into the gusset to cut through the base of the gusset and make a slit "S". The position of this slit will normally be arranged to fall within the range of approximately one-fifth to three-fifths of the distance "D" between the subsequent cross seals which define the edges of the finished bag.
  • a strip of centre-folded film equal in measurement to the width of the finished bag is fed into the gusset as indicated at "B".
  • the longitudinal edges of this strip are then welded to the outer longitudinal edges of the gusset along the film for a distance equal at least to the desired width "D" of the bag being made.
  • the slit is at an angle to the slit "S" in the gusset and is longitudinally displaced from it.
  • the sealing technique uses a side welding bar "H" positioned across the direction of feed "A" of the gusseted film.
  • the welding bar is pressed against the film to make cross-welds indicated by broken lines in the drawing and spaced apart by a distance "D" equal to the desired width of the finished bag. Whilst the film is still molten and held under the welding bar, the film is pulled apart at the weld leaving a seal at each side of the break. As the film advances and the sealing is repeated at suitably spaced intervals, bags are formed between the welds.
  • the slit "C" in the base of the bag defines a flap which will lift to give an entrance to the space between the extra welded-in strip of film and the sides of the gusset that strip covers.
  • the bag can then be filled by pouring or blowing material with a suitable nozzle through this flap and into the bag through the slit "S" in the gusset.
  • the filling aperture would normally be at the top of the bag.
  • the material cannot be poured out of the bag because, when the bag is inverted after filling to stand on its base, pressure of the material in the bag presses the gusset walls against the welded-in film strip and this seals off the exit.
  • a variation of the above construction can be achieved, still using a similar technique and gusseted tubing, but this time no extra strip of centre-folded sheeting is fed into the gusset after slitting.
  • the slit in the base of the gusset is made in the same manner as previously described. It is then arranged that a heat-sealing bar welds across the gusseted tubing at X after the slitting operation in the gusset.
  • a shim of P.T.F.E. is allowed to trail in the gusset and under this sealing bar so that the two inner faces of the gusset do not weld together at any point.
  • an arrangement of cooling air jets and extra feed rollers may be necessary.
  • the film is moved forward a distance equal to the required width of the bag.
  • the two longitudinal edges of the gusset are now welded together for a length equal at least to the width of the bag and encompassing the slit contained in the base of the gusset.
  • a further heat-sealing bar then welds across the film, in a position closely adjacent the first cross-weld and this time including welding the gusset together.
  • the gusseted edges of the film form the ends of the finished bags.
  • Bags made in this manner will have a tube across the top of the bag with an opening at one end. Material poured into this opening will fall into the body of the bag through the slit in the bottom of the gusset but when turned upside down it cannot get out again because the tube forms a valve.
  • the gusseted base of the bag will open out to a square form similar to a "block bottom" sack.
  • the air it is sometimes necessary, particularly when powders are being forcibly blown into a valve sack, for the air to be able to escape. This is very easily accommodated with the sack incorporating the extra strip of film in the gusset. If the bottom corners of the empty sacks are perforated within a right-angled triangle defined in the corner whose short sides are of a length not exceeding the depth of the gusset, the perforations will allow the pressurised air to escape when the bag is being filled and the filling "tube" is open, but will automatically be sealed off when the bag is subsequently inverted.
  • the perforated holes may also be utilized to give moisture permeability to the bag, the size and number of the holes being made to suit requirements.
  • the invention is ideally suited to plastics which can be heat-welded, the same principle can be applied to paper, woven polypropylene, Hessian and the like where adhesives or sewing methods are used.
  • the formation of the sack is the same but the method of sealing is that most appropriate to the material being used.
  • either or both of the slits "S" and "C"' are formed as lines of weakening or perforations in the film: when the bag comes to be filled, the filling nozzle punches through the weakened or perforated lines and creates the slits which admit the contents to the bag.
  • a similar modification can be made to the second construction described.
  • Either of these constructions of bag can be provided with a carrying handle, by sealing along the top edge of the finished bag (i.e. along the edge running from H to X in the drawing) and then punching a hand-hole (or two spaced- apart hand-holes) in a sealed area.
  • the said seal could be taken along a line running parallel to the bag's top edge, and spaced inwardly from it.
  • the seal could fuse all four thicknesses of film together along a relatively wide area running parallel to the bag's top edge, so that a rigid band is formed along the top edge of the bag in which the or each hand-hold can be punched. In either case, of course, the seal must close the base of the gusset.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Making Paper Articles (AREA)
EP78300626A 1977-11-23 1978-11-14 Sac à valve et son procédé de fabrication Withdrawn EP0002326A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7845758A GB2044729A (en) 1978-11-14 1978-11-23 Valve sack

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB48814/77A GB1590326A (en) 1977-11-23 1977-11-23 Valve sacks and methods of making them
GB1153578 1978-03-23
GB1153578 1978-03-23
GB4881477 1978-05-17

Publications (1)

Publication Number Publication Date
EP0002326A1 true EP0002326A1 (fr) 1979-06-13

Family

ID=26248343

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78300626A Withdrawn EP0002326A1 (fr) 1977-11-23 1978-11-14 Sac à valve et son procédé de fabrication

Country Status (5)

Country Link
EP (1) EP0002326A1 (fr)
JP (1) JPS54100880A (fr)
DK (1) DK519278A (fr)
FI (1) FI783551A (fr)
IE (1) IE47675B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0095817A1 (fr) * 1982-06-02 1983-12-07 Wavin B.V. Méthode et dispositif pour réaliser des perforations dans une bande tubulaire en matière plastique
US8201688B2 (en) 2003-06-27 2012-06-19 Proctor And Gamble Corporation Pouch with side gussets for use in carrying fluid for personal hygiene device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2787154B2 (ja) 1995-12-13 1998-08-13 株式会社東海 高熱量ガス器具における気化助勢装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1035248A (en) * 1962-05-07 1966-07-06 Veith Kunststoffwerk G M B H Valved bag particularly of weldable plastic material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1035248A (en) * 1962-05-07 1966-07-06 Veith Kunststoffwerk G M B H Valved bag particularly of weldable plastic material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0095817A1 (fr) * 1982-06-02 1983-12-07 Wavin B.V. Méthode et dispositif pour réaliser des perforations dans une bande tubulaire en matière plastique
US8201688B2 (en) 2003-06-27 2012-06-19 Proctor And Gamble Corporation Pouch with side gussets for use in carrying fluid for personal hygiene device

Also Published As

Publication number Publication date
FI783551A (fi) 1979-05-24
IE47675B1 (en) 1984-05-16
IE782302L (en) 1979-05-23
JPS54100880A (en) 1979-08-08
DK519278A (da) 1979-05-24

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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): BE CH DE FR LU NL SE

17P Request for examination filed
R17P Request for examination filed (corrected)
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: 19820104

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HARDWICK, HARRY FLEEMAN