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 object of this invention is a sack or a similar flexible package, intended for packing powdery material, which is provided with a filling duct of flexible material leading inside the sack and with a flexible covering patch protruding from the sack with the aid of which the end of the filling duct can be closed after the filling of the sack.
• the flexible filling duct acts as a valve which in the filling process lets the material to be packed flow into the sack and flatten out after the filling, in such a way that the path of flow is closed.
• a valve such as a so-called pocket valve must be selected enabling absolute tightness. It is only possible to partly mechanize the filling of such a sack and the valve usually must be closed by manually bending it which on the other hand is slow and requires man-power.
• a duct acting as a valve can be closed after the filling of the sack by adhering a covering patch on top of it. It is also known that an extra patch can be attached, in conjunction with the manufacture of the sack, on the upper or lower sides of the valve. The extra patch is folded over the valve and attached by glue after the filling of the sack. It is further known that the inner surface of the valve can be of a material which can be glued or heat-sealed shut after the filling.
• the purpose of this invention is to form a sack or a similar flexible package in which the above problems of known sacks are avoided.
• the sack according to the invention is characterized in that the filling duct extends at least to the bending line of the covering patch and that the end of the filling duct is narrower than the covering patch, whereby the covering patch can be bent against the surface of the sack and attached thereto in such a way that it forms a uniform closing zone which closes the end of the filling duct in a cross-direction and extends on each side thereof.
• the solution according to the invention prevents leakage through the fringes of the filling duct serving as a valve which is a problem of the known sacks in which the filling duct and the covering patch are of the same width.
• the invention thus prevents the material possibly remaining in the filling duct from leaking out of the package, as well as leakage through channels caused by the corrugations of the filling duct, which so far have been very common occurences in the case of under-filled sacks.
• the packing process can be carried out fully-automated without manual procedures.
• the sack or a similar flexible package according to the invention is particularly suitable for such fine-ground, powdery products which, because of leakage, would cause contamination of their surroundings or other damage or risks or which themselves would suffer from environmental effects, such as air humidity.
• the advantage is achieved that loss of the product caused by leakage is avoided.
• the material of the sack according to the invention different flexible materials are well adapted, such as paper, plastic and textiles or combinations thereof which can be provided in the sack as one or more layers.
• other flexible packages such as bags, can be considered in which the application of a similar filling technique is possible.
• the filling duct of the sack extends past the bending line of the covering patch in such a way that while closing the sack, the end of the duct is turned, along with the covering patch, against the surface of the sack.
• the object of the invention is also to provide a packing method in which fine-ground material is packed into the sack or a similar flexible package through an associated filling duct of flexible material and in which the sack is closed, after the filling, with a covering patch protruding from the sack.
• the covering patch is folded against the surface of the sack against the end of the filling duct and is attached thereto.
• the method is characterized in that the filling duct is extended at least to the bending line of the covering patch and is formed, at least at the end thereof, to a width smaller than the covering patch, whereby when closing the sack with the covering patch, a uniform closing zone is obtained closing the end of the filling duct in a cross-direction and extending on each side thereof.
• Fig. 1 shows a sack according to the invention before the filling
• Fig. 2 shows a corner of the sack in Fig. 1 which is provided with a filling duct leading inside the sack and serving as a valve, and a covering patch,
• Fig. 3 shows the corner of the unfilled sack in Fig. 2 as viewed from the side.
• Fig. 4 shows the corner of the sack corresponding to Fig. 2 after its filling and the application of the glue
• Fig. 5 shows the corner of the sack which is closed by gluing a covering patch on the end surface of the sack
• Fig. 6 shows the corner of the filLed and closed sack according to Fig. 5, as viewed from the side.
• Fig. 7 shows another sack or bag according to the invention, as viewed from the side.
• Fig. 8 shows the filling duct and the covering patch on the side of the sack according to Fig. 7 before the closing of the sack.
• Fig. 9 shows the parts of the sack according to Fig. 8 after the sack has been closed.
• Fig. 10 shows, corresponding to Fig. 8, the filling duct and the covering patch on the side of the sack such as they are according to an alternative embodiment of the invention
• Fig. 11 shows the parts of the sack according to Fig. 10 after the sack has been closed.
• Fig. 1 shows unfilled, glued sack 1 according to the invention which is suitable for a package of fine-ground materials, such as PVC plastic, diatomaceous earth or food stuffs such as flour.
• the sack is a flexible package which is closed except for a filler opening in one corner 2 of the sack which has filling duct 3 fitted to serve as a valve.
• the material of sack 1 can be, for instance, strong paper and filling duct 3 is of flexible material, such as plastic.
• Ends 4, 5 of sack 1 are formed by bending the ends of a tubular sack blank so as to overlap and by joining them, for instance, by gluing. According to the figure, other end 4 is further provided with end or botton patch 6 glued thereto. (In practice the bottom patches, when used, are usually provided on both ends of the sack.)
• FIG. 2 and 3 show that said strip 8 extends in the direction of filling duct 3 past end 11 of the duct forming covering patch 12 protruding from the sack with the aid of which the sack can be closed after the filling.
• Covering patch 12 is thus bent 180° along bending line 13 which is situated at the edge formed by the base of the patch in the corner of the sack.
• filling duct 3 extends slightly past bending line 13 of covering patch 12 and that end 11 of the filling duct (the whole filling duct in the illustrated application) is narrower than the covering patch.
• the filling duct has been of the same length as the end of the sack and the covering patch protruding from it, whereas according to the invention, filling duct 3 has been so tapered that on each side of its end 11 there remains a strip of covering patch 12 which is at least a few millimeters and preferably at least about 1 cm in width and forms a part of the closing zone which is formed when the sack is closed and which is better shown in Figs. 4 and 5.
• closing zone 16 closes end 11 of the duct in the cross-direction of the filling duct and extends to each side of the end of the duct and further axially on each side of the duct until bending line 13 remaining in the corner of the closed sack. Closing zone 16 has thus been achieved surrounding tightly end 11 of the filling duct in three directions thereof and preventing leakage from the sack even in difficult transportation conditions.
• Fig. 7 shows sack 1 according to the invention, in which the filling duct and the covering patch are situated on the side of the sack in a spot indicated by line 17.
• Filling duct 3 and covering patch 12 are shown in Fig. 8 in which the construction, with respect to the essential parts, corresponds to the one illustrated in Figs. 2 to 6.
• Filling duct 3 thus extends past bending line 13 of covering patch 12 in such a way that when closing the sack, end 11 of the duct turns along with the covering patch against the side of the sack.
• the closed sack with closing zones 16 obtained with the aid of glue or adhesive is shown in Fig. 9.
• Figs. 10 and 11 show an alternative application of the invention corresponding to Figs. 8 and 9 in which end 11 of filling duct 13 is situated on bending line 13 of covering patch 12.
• the glue or the adhesive forms closing zone 18 covering the major area of the covering patch and extending past end 11 of the filling duct to each side thereof.
• covering patch 12 and end patch 6 can be preferably, instead of paper, for instance a plastic film or other plastic-coated or laminated material.
• the attachment of the covering patch to the end patch forming the surface of the sack can be effected by heat sealing.
• Plastic which is processed to be antistatic can thus preferably be used as the adhesive, whereby the cleaning of the surfaces attached together is easier.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Bag Frames (AREA)
• Supplying Of Containers To The Packaging Station (AREA)
• Basic Packing Technique (AREA)
• Package Closures (AREA)
• Container Filling Or Packaging Operations (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8531156

Family Applications (1)

Country Status (12)

Cited By (4)

Families Citing this family (1)

Citations (6)

Family Cites Families (1)

• 1990
  • 1990-10-01 FI FI904844A patent/FI90520C/fi not_active IP Right Cessation
• 1991
  • 1991-09-30 IE IE344491A patent/IE69334B1/en not_active IP Right Cessation
  • 1991-10-01 PT PT99136A patent/PT99136A/pt not_active Application Discontinuation
  • 1991-10-01 DE DE69111819T patent/DE69111819T2/de not_active Revoked
  • 1991-10-01 EP EP91916178A patent/EP0550492B1/en not_active Revoked
  • 1991-10-01 ES ES91916178T patent/ES2076546T3/es not_active Expired - Lifetime
  • 1991-10-01 DK DK91916178.6T patent/DK0550492T3/da active
  • 1991-10-01 AT AT91916178T patent/ATE125767T1/de not_active IP Right Cessation
  • 1991-10-01 WO PCT/FI1991/000302 patent/WO1992006014A1/en not_active Application Discontinuation
• 1993
  • 1993-03-25 NO NO93931109A patent/NO931109L/no unknown
  • 1993-04-01 LV LVP-93-218A patent/LV10703B/xx unknown
• 1995
  • 1995-10-17 GR GR950402857T patent/GR3017757T3/el unknown

Patent Citations (6)

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