US3482762A - Valve bag - Google Patents

Valve bag Download PDF

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Publication number
US3482762A
US3482762A US730384A US3482762DA US3482762A US 3482762 A US3482762 A US 3482762A US 730384 A US730384 A US 730384A US 3482762D A US3482762D A US 3482762DA US 3482762 A US3482762 A US 3482762A
Authority
US
United States
Prior art keywords
valve
bag
panels
seals
valve bag
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
US730384A
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English (en)
Inventor
Elwyn David Jones
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.)
PPG Architectural Coatings Canada Inc
Original Assignee
Canadian Industries 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 Canadian Industries Ltd filed Critical Canadian Industries Ltd
Application granted granted Critical
Publication of US3482762A publication Critical patent/US3482762A/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
    • 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
    • B65D31/142—Valve bags, i.e. with valves for filling the filling port being formed by folding a flap connected to a side, e.g. block bottoms

Definitions

  • a valve bag having side seams and gusseted top and bottom walls. The valve is formed by overlapping portions of the top gusseted wall.
  • the bag is preferably fabricated from heat scalable plastic film such as polyethylene, The bag can be made from lengths of plastic film employing automatic bag-making machines.
  • This invention relates to a valve bag suitable for manufacture by automatic bag-making machines.
  • Valve bags are in general use for packaging materials such as fertilizers and cement. These bags possess the important commercial advantage of easy filling and closing after filling. However, the presence of the valve in the bag structure introduces problems in bag manufacture and may require manual operation of certain steps in the manufacturing process. There is thus need for a valve bag of simple construction that can be manufactured employing automatic bag-making machines.
  • valve bag having the valve constructed of overlapping panels in the bag gusset can be manufactured employing automatic bag-making machines.
  • the novel design of bag permits an increased rate of production and requires a minimum of manual operations.
  • the valve bag of this invention comprises front and back panels joined along two opposed edges to form a flattened tube, the remaining two opposed edges of the front and back panels being joined by gusseted end panels, one of said end panels being formed of two portions having lengths less than the length of the gusseted end panel, said portions overlapping at their inner extremities, the inner extreme edge of each portion being free, thus forming a valve. It is convenient to employ thinner gauge film at the free extremities of the valve walls, the thinner extension in the case of the external valve wall being folded back to lie in contact with the internal valve wall.
  • FIGURE 1 is a perspective view of filled bag
  • FIGURE 2 is a prespective view of the bag of FIGURE 1 in a collapsed configuration
  • FIGURE 3 is a sectional view of simple valve
  • FIGURE 4 is a sectional view of a valve having an ex tension of thinner gauge film joined to the free extremity of the inner wall of the valve;
  • FIGURE 5 is a sectional view of a valve having extensions of thinner gauge film joined to the free extremities of both walls of the valve, and
  • FIGURE 6 is a sectional view along VIVI of FIG- URE 1.
  • FIGURES 1 and 2 front and back panels of a bag are shown at 1 and 2 respectively.
  • the back panel is disposed in parallel relationship to the front panel.
  • Front and back panels are joined along longitudinal seams 2a and 2b.
  • At 3 are shown diagonal seals in the gusset region, The diagonal seals assume a V- shaped configuration when the bag is filled.
  • At 4 is shown a bag bottom.
  • a valve structure is shown at 5 and 6, 5 being the outer portion of the valve and 6 the inner portion of the valve. It is to be noted that the two portions of the valve overlap at their inner extremities.
  • the two valve portions are sealed to the front and back panels along seals 3 and 9.
  • FIGURE 3 is shown a section through a valve of the configuration of that illustrated in FIGURES 1 and 2.
  • FIGURE 4 an extrension of thinner gauge film 7 is joined to the inner wall 6.
  • thinner gauge extensions to both walls of the valve are shown, extension 8 being folded back to lie parallel to the inner side of outer walls.
  • FIGURE 6 is a sectional view showing the lap sealing of the valve portions 5 and 6 to the front and back panels along seal 9.
  • the valve bag of this invention is conveniently fabricated from heat-sealable plastic film such as polyethylene. It is preferred to employ a folded sheet of film having front and back panels 1 and 2 with a joining gusset fold joining the panels at the position of the bag bottom. Two overlapping pieces of film of shape to form the valve 5 and 6 are then sealed to the front and back panels along diagonal gusset seals 3 and transverse seals 9.
  • the transverse seals 9 may be of either the lap type as shown in the drawings or of the flange type as employed in seals 2a, 2b and 3.
  • the longitudinal seals, 2a and 2b and bottom gusset seals 3 are then made to complete the bag structure. Excess film from the gusset seal is severed external to the seal position.
  • valve bag of this invention has the advantage that it can be made in a continuous manner from lengths of plastic film employing automatic bag-making machinery.
  • the bag itself is readily filled and in filled configuration is rectangular in shape with attendant advantage in ease of storage.
  • a valve bag having front and backpanels joined along two opposed edges to form a flattened tube, the remaining two opposed edges of the front and back panels being joined to gusseted end panels, the improvement which comprises a valve formed by constructing one of the gusseted end panels in two portions sealed to matching edges of the front and back panels along the opposing longitudinal edges of said end panels, the end panels overlapping at their inner extremities so as to form the internal and external walls of the valve, the inner extreme edge of each portion being free and forming the valve opening, the free extremity of the external valve wall carrying an extension folded back into the valve.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
US730384A 1967-06-01 1968-05-20 Valve bag Expired - Lifetime US3482762A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB25383/67A GB1211696A (en) 1967-06-01 1967-06-01 Improvements in and related to valved bags

Publications (1)

Publication Number Publication Date
US3482762A true US3482762A (en) 1969-12-09

Family

ID=10226787

Family Applications (1)

Application Number Title Priority Date Filing Date
US730384A Expired - Lifetime US3482762A (en) 1967-06-01 1968-05-20 Valve bag

Country Status (8)

Country Link
US (1) US3482762A (cs)
BE (1) BE715980A (cs)
BR (1) BR6899428D0 (cs)
DK (1) DK120520B (cs)
FR (1) FR1581548A (cs)
GB (1) GB1211696A (cs)
IL (1) IL30033A (cs)
SE (1) SE330123B (cs)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095736A (en) * 1976-10-22 1978-06-20 International Paper Company Bag closure having valve sleeve
US4524460A (en) * 1983-02-14 1985-06-18 Windmoller & Holscher Valved sack
US20100008603A1 (en) * 2008-07-09 2010-01-14 Julie Rossing Smith Sealable repulpable valve bag and method of assembling
US8142077B2 (en) 2008-04-16 2012-03-27 Graphic Packaging International, Inc. Bag structures and methods of assembling the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136771A (en) * 1983-03-24 1984-09-26 Lolift Containers for bulk material

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1185466B (de) * 1961-08-11 1965-01-14 Windmoeller & Hoelscher Ventilsack aus Kunststoff sowie Verfahren und Vorrichtung zu seiner Herstellung
US3235169A (en) * 1962-04-09 1966-02-15 Windmoeller & Hoelscher Plastic valve bag

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1185466B (de) * 1961-08-11 1965-01-14 Windmoeller & Hoelscher Ventilsack aus Kunststoff sowie Verfahren und Vorrichtung zu seiner Herstellung
US3235169A (en) * 1962-04-09 1966-02-15 Windmoeller & Hoelscher Plastic valve bag

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095736A (en) * 1976-10-22 1978-06-20 International Paper Company Bag closure having valve sleeve
US4524460A (en) * 1983-02-14 1985-06-18 Windmoller & Holscher Valved sack
US8142077B2 (en) 2008-04-16 2012-03-27 Graphic Packaging International, Inc. Bag structures and methods of assembling the same
US20100008603A1 (en) * 2008-07-09 2010-01-14 Julie Rossing Smith Sealable repulpable valve bag and method of assembling

Also Published As

Publication number Publication date
FR1581548A (cs) 1969-09-19
BR6899428D0 (pt) 1973-02-06
IL30033A0 (en) 1968-07-25
BE715980A (cs) 1968-10-16
GB1211696A (en) 1970-11-11
DK120520B (da) 1971-06-07
IL30033A (en) 1971-12-29
SE330123B (cs) 1970-11-02

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