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

Definitions

• the present invention concerns the actual valve of a valve bag of plastic or paper where the tube shaped valve is made from plastic or from plastic coated paper and the valve according to the invention is fitted with a number of slits in the valve wall in order to make the valve spillfree.
• the invention also concerns the production of the valve and the positioning of it-
• valve in valve bags is not tight. When the bag is put down, this will result in some of the goods in the bag being spilled through the valve. The spill can be so considerable as to cause a noticeable shortage of goods and also a mess around the bags.
• the spill problem is particularly evident if the substance in the bag is dry and in addition is easily movable (spherical particles) or if the substance is a granulate which is par ⁇ ticularly easily spilled.
• fringe valves have been well known for some time, where the fringes are located on the innermost part of the valve, i.e. that part of the valve which is the farthest in ⁇ side the bag.
• the measure has, however, the disadvantage that it is efficient for valves of paper but not for valves of plastic or plastic coated paper. This will be explained further.
• This design with lengthwise slits and where the fringes end in a small brim at the innermost rim of the valve, has proved to limit the spill of the goods effectively.
• the design also has the advantage of being produced in a continuous process and it simplifies the production of the valve cuff and the fitting into the bag during the production process.
• Figure 1 shows a flattened, tube shaped fringe valve viewed from above, in which the characterizing feature is that the fringes are slit all the way, while
• Figure 2 shows a lengthwise slit, flattened and tube shaped valve according to the invention, viewed from above,
• Figure 3 shows the position of the valve in the bag where the valve, because it is located inside the bag and not visible from the outside, is drawn by dot-and-dash lines.
• the slits (6) are also drawn by dot-and-dash lines.
• Figure 1 shows a fringe valve of a known design in which the valve wall ( 1 ) of paper at one end is slit lengthwise in such a way as to form a fringe part with hanging loose fringes (2).
• the fringes are divided from each other by the slitting, and the cut (3) forms the separation between the fringes.
• the fringes (2) are fastened at their rear end to the valve (1 ) .
• FIG. 2 shows a valve of plastic or plastic coated paper according to the invention which con ⁇ sists of strips (5), where the strips (5) are held together at both ends of the valve wall (1).
• the valve wall (1) with its strips (5) constitute an entity and is here referred to as the valve.
• the valve forms a pipe or a tube which is the result of ex ⁇ truding or gluing or welding of a plane foil of plastic or of plastic coated paper across the adjoining ends of the foil in the longitudinal direction of the foil.
• the wall thickness of the foil is preferably in the range of from 80 to 120 u, but it may be thicker or thinner.
• the width of the strips will be more or less optional, but as a rule it will depend on the width of the bottom of the bag in such a way that the narrower the bottom of the bag is, the narrower will the strips be, and vice versa. Usually, the width of the strips will be in the range of from 5 to 15 mm, but they may also be narrower or wider.
• the strips (5) are at their rear end a continuous part of the valve wall (1), divided by slits (6). At their forward end the strips are held together by means of a rim (7) which also constitutes part of the valve wall.
• the object of this rim (7) is to hold the strips (5) toget ⁇ her, and thereby to prevent them from being pulled back separately into the valve when the filler spout is retracted after the filling is completed.
• the rim (7) In order to serve its pur ⁇ pose, the rim (7) must have a certain tensile strength so that it has a gathering effect on the strips (5). In prac ⁇ tice it has proved that a rim width of approx. 2 mm is suf ⁇ ficient to achieve the " desired effect.
• the rim width may, however, be somewhat larger for thinner foils or somewhat smaller for thicker foils.
• FIG 3 shows the bag (8) with it ' s folded and flattened bottom section (9). This part of the bag is known and is not part of the invention.
• the valve (1) is shown by a dot-and- dash line glued firmly below the intersecting layers of the bag and entirely covered by an outer layer of plastic foil or foil of plastic coated paper (10).
• the inventive conception has, moreover, not led to any changes in the existing equipment or in the work procedures, as the valve with its strips is produced continuously in the n same equipment as before and is fitted into the bag in a sub ⁇ sequent continuous operation.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Bag Frames (AREA)
• Making Paper Articles (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19886594

Family Applications (1)

Country Status (6)

Cited By (1)

Citations (1)

Family Cites Families (1)

• 1982
  • 1982-05-28 NO NO821811A patent/NO150190C/no unknown
• 1983
  • 1983-04-25 DE DE8383901407T patent/DE3360659D1/de not_active Expired
  • 1983-04-25 WO PCT/NO1983/000015 patent/WO1983004239A1/en active IP Right Grant
  • 1983-04-25 EP EP83901407A patent/EP0109407B1/en not_active Expired
• 1984
  • 1984-01-18 FI FI840196A patent/FI69804C/fi not_active IP Right Cessation
  • 1984-01-23 DK DK028884A patent/DK151097C/da not_active IP Right Cessation

Patent Citations (1)

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