US3268152A - Self-sealing valve bag - Google Patents

Self-sealing valve bag Download PDF

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Publication number
US3268152A
US3268152A US414072A US41407264A US3268152A US 3268152 A US3268152 A US 3268152A US 414072 A US414072 A US 414072A US 41407264 A US41407264 A US 41407264A US 3268152 A US3268152 A US 3268152A
Authority
US
United States
Prior art keywords
bag
valve
wall
ply
opening
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
US414072A
Other languages
English (en)
Inventor
Henry D Swartz
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.)
Thermoplastic Industries Inc
Original Assignee
Thermoplastic Industries Inc
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 Thermoplastic Industries Inc filed Critical Thermoplastic Industries Inc
Priority to US414072A priority Critical patent/US3268152A/en
Priority to GB1424/65A priority patent/GB1093212A/en
Priority to AT33865A priority patent/AT269733B/de
Priority to ES0308584A priority patent/ES308584A1/es
Priority to NL6501638A priority patent/NL6501638A/xx
Priority to CH272665A priority patent/CH437997A/de
Priority to DK144565AA priority patent/DK108446C/da
Priority to BE669397D priority patent/BE669397A/xx
Application granted granted Critical
Publication of US3268152A publication Critical patent/US3268152A/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
    • B65D31/147—Valve bags, i.e. with valves for filling the filling port being provided in a side wall

Definitions

  • This invention relates generally to containers of the type that are filled through self-closing valves and more particularly is directed towards a container of the sort constructed at least in part with heat scalable panels and having a flexible self-sealing valve of a heat sealable material attached thereto.
  • This invention is also directed towards a novel method for producing self-sealing containers of the foregoing type in a simple and efficient manner.
  • a self-sealing container which, in its principal embodiment, comprises a bag formed from plies of a heat sealable material, such as polyethylene for example, and having attached to one wall thereof a flat sleeve type valve located inwardly of the bag edges and which is adapted to close automatically under pressure.
  • a heat sealable material such as polyethylene for example
  • This type of container and valve have been found to be particularly useful in packaging, storing and shipping a wide variety of materials both granular and liquid insofar as the bag is extrmely rugged, inexpensive and seals tightly.
  • the greater the pressure on the bag as when a number of bags are stacked on a pallet, the greater is the sealing action and this feature makes the bag particularly suitable for stacking a number of bags for storage and shipment.
  • a more specific object of this invention is to provide improvements in self-sealing bags of heat sealable material.
  • Another object of this invention is to provide a selfsealing container of simple design and one which lends itself to quick and easy assembly by mass production techniques.
  • a further object of this invention is to provide a novel method for fabricating self-sealing containers.
  • this invention features a self-sealing container comprising a container and valve assembly wherein the container is formed with at least one wall of heat sealable material to which is bonded a sleeve also of heat scalable material.
  • the sleeve is mounted flat against the wall and is formed from two or more plies of flexible heat sealable material, the ply adjacent the container wall being formed with an opening in register with an opening in the container wall and through which the container is filled.
  • the sleeve plies are characterized by different heat sealing points with the ply bonded to the container wall having a lower softening point than the opposing sleeve ply.
  • a heating die may be employed against the outer surface of the container walls with the sleeve placed in register with the die to simultaneously bond the low temperature sleeve ply to the container wall and form the opening therein without affecting the opposing sleeve ply.
  • This invention also features a novel method of assembling a self-sealing container comprising the steps of marginally bonding two plies of flexible heat sealable material of different heat softening characteristics to form a flexible sleeve, placing the sleeve within a partly formed container with the sleeve ply of lower softening characteristics flat against a heat scalable wall of the container, applying heat from the outer surface of the container Wall and over a predetermined design in register with the sleeve underlying said wall for a sufficient period and at a suflicient temperature and pressure to thermally bond the low-temperature sleeve ply to the panel wall and simultaneously form a common opening therein without altering the opposing sleeve ply, and finally sealing the remaining portion of said container.
  • FIG. 1 is a view in perspective of a self-sealing container made according to the invention
  • FIG. 2 is a cross-sectional detailed view taken along the line 22 of FIG. 1,
  • FIG. 3 is a top plan view of a valve element prior to assembly
  • FIG. 4 is a sectional view in side elevation of the FIG. 3 valve
  • FIG. 5 is a view in perspective showing a gusseted flexible tube used in fabricating a flexible valve bag
  • FIG. 6 is a top plan view showing the valve sleeve element assembled in the FIG. 5 tube prior to the heat sealmg operation
  • FIG. 7 is a view in perspective of a heat sealing device employed in the invention.
  • FIG. 8 is a sectional view in side elevation showing an apparatus for simultaneously attaching the valve element and sealing the tube ends
  • FIG. 9 is a view in perspective showing a modification of the invention.
  • FIG. 10 is a view in perspective showing another modification of the invention.
  • FIG. 11 is a view in perspective showing a further modification of the invention.
  • FIG. 12 is a sectional view of the FIG. 11 modification
  • FIG. 13 is a detail sectional view of a still further modification.
  • FIG. 14 is a perspective view partly broken of still another modification.
  • FIG. 15 is a perspective view of a still further modification of the invention.
  • the reference character 10 generally indicates a bag which may be of single or multiwall construction and typically is formed from a heat scalable material such as sheet polyethylene or the like.
  • the bag itself preferably is formed from tubular material which may be gusseted at 12 and its end sealed along heat sealing lines 14 and 16 to form a closed container.
  • a self-sealing valve 18 is mounted to the inner face of one wall 19 of the bag 10 and typically is located in the upper right hand corner as shown to permit filling of the bag with conventional automatic loading machines. Quite obviously, the valve could be located at any other suitable position depending upon particular applications. In any event, the valve is attached to the inner face of one wall of the bag along a delta shaped sealing line 20. A curved slit opening 22 is formed in the bag wall and through the valve with a heat sealing line 24 extending thereabout. The inner free end of the valve 18 is unattached as at 25 to provide a loose flap which is adapted to fold over against itself once the bag has been filled to form a tight seal which positively prevents escape of the bag contents.
  • valve element 18 prior to assembly is essentially a sleeve or pocket formed by bonding two or more plies 26 and 28, which may be rectangular or other useful shapes, along three marginal edges by heat seal line 36, so that an end 32 is open.
  • valve plies 26 and 28 are made of materials having dilferent heat sealing characteristics with the ply 26 which underlies the bag wall 19 being formed from a material having a relatively low temperature heat sealing characteristic and generally similar to the heat sealing characteristics of the bag wall.
  • the valve ply 28, on the other hand, is formed from a material having a relatively high temperature heat sealing characteristic.
  • the valve element may be quickly and easily mounted and the bag completed in a minimum number of steps.
  • the blank valve element 18, as shown in FIGS. 3 and 4 is inserted in the open ended tube 11 and positioned in the desired mounting position in the manner suggested in FIG. 6.
  • the low-temperature ply 26 of the valve element should be facing against the tube wall 19 to which the valve element will be bonded.
  • the tube 11 and valve element are placed on a flat support 34 with the valve element 18 in register with a heating die 36 and sealing dies 38 disposed oppositely the ends of the tube 11.
  • the die 36 as best shown in FIG. 7, is provided with relatively Wide heating elements 40 corresponding to the outline of the heat sealing lines 20 and 24 shown best in FIG. 1.
  • the die is also provided with a relatively narrow heating element 42 corresponding to the shape of the slit opening 22 shown in FIG. 1.
  • the sealing dies 38 are provided with straight line relatively wide heating elements 44 which span the width of the tube 11 to make the heat sealing lines 14 and 16 which seal the bag ends.
  • the die 36 comes down against the outer surface of the tube wall opposite the valve element, it is held in position long enough to form the heat seal lines 20 and .24 which attach the valve element to the tube Wall.
  • the heating element 42 cuts through the tube wall 19 and the ply 26 to form the valve opening.
  • the heating elements 38 seal the ends of the tube to form the bag.
  • the function of the high temperature valve ply 28 is to prevent the heat of the die 36 from causing the ply 28 to bond itself to either the opposite wall of the bag or to the ply 26 to which it has been joined along the previously formed sealing lines 30. In this fashion the valve is assembled in the proper position and the valve itself is attached only by means of the ply 26.
  • the bag may be filled by inserting a nozzle in the slit opening 22 and injecting the fill in the bag. Once the bag is filled the valve plies 26 and 28 will close against one another and both will lay flat at least in part against the bag Wall. Very frequently the free end of the valve will fold back to form an even more effective seal in the manner described in my above patent.
  • a container such as a flexible plastic bag 46 is provided with a bellows type valve 48 attached to the inner face of one wall thereof.
  • This valve comprises two plies 50 and 52 with the ply 50 being of a material having a relatively low softening point and bonded to the bag wall along heat sealing lines 54 and 56.
  • An opening 58 is formed through the bag wall in register with the valve opening through the ply 50 and the opening is sealed around its periphery by the heat seal line 56.
  • the ply 50' is folded to define gussets 60 with the edges being marginally bonded to the ply 52 along seal line 62.
  • the ply 52 is formed from a material having a relatively high softening point so that when a heating die is brought down against the outer surface of the bag wall oppositely the prepositioned valve element 48 the valve will be bonded to the bag wall only by the ply 58 since the ply 52 serves as an insulator for the opposite wall of the bag and also, since its sealing characteristics are different from those of the ply 50, is will not 'be heat sealed either to the ply St) or to the front wall of the bag.
  • valve opens up as a bel lows when the bag is filled through the opening 58 and, once filled, the interior pressure will cause the bellows valve 48 to close with the ply 52 being pressed fiat against the ply 50 and completely sealing the opening 58.
  • This type of valve bag is particularly Well adapted for use with a rigid supporting container such as a corrugated carton 53 as shown in FIG. 14. This carton is formed with a prepunched filler opening 55 which registers with the valve opening 58.
  • a multi-wall bag 64 is provided with a self-sealing valve 66 such as that illustrated in FIG. 10.
  • the bag may be gusseted as suggested in FIG. 11 or the sides may be conventional in shape.
  • the bag is of multi-wall construction having an inner ply 68 and an outer ply 70. Both plies are formed with a number of small perforations 72 and 74 arranged in spaced rows with the perforations 72 in the outer ply being arranged in rows that are offset from the perforations 74 in the inner ply 68. In this fashion, the perforations will permit the free escape of air entrapped within the bag.
  • FIG. 9 there is illustrated a modification of the invention and in this embodiment a container such as a flexible bag 76 of heat sealable material and similar to the bag 10 in the principal embodiment is provided with a self-closing valve 78 also similar to the valve 18 described in connection with FIG. 1.
  • the valve opening 80 may be fully sealed to provide a positive barrier to the entrance of vermin or the like by means of a pressure sensitive adhesive flap 82.
  • This flap is provided With a protective stratum 84 which covers the adhesive coated free end of the flap until ready for use.
  • the flap is prepositioned with one end of the flap attached to the outer surface of the bag wall immediately adjacent the valve opening 80 and the stratum 84 has a free hanging tab 86 which an operator may grasp once the bag is to be sealed. It will be understood that once the bag is filled, it is necessary for the operator only to pull the tab 86 to the left as viewed in FIG. 1 to peel oif the protective stratum from the adhesive covered flap. In doing so, he may also pull it against the surface of the bag so that in one motion the pressure sensitive adhesive will be exposed and the flap will be pressed down over the opening.
  • valve bags of the foregoing type may be connected end-to-end by a perforated tear line 90 and wrapped into a roll 92. With this arrangement the bags may be unwound from the roll past a filling unit 94 having multiple nozzles 96 for filling several bags simultaneously. The bags may be separated by tearing them apart along tear line 90.
  • bag 10 and valve ply 26 both are composed of low density polyethylene ranging in thickness from 0.001 to 0.006 mil, in specific gravity from 0.910 to 0.925 and in softening point from 250 to less than 325 F.; and valve ply 28 is composed of high density polyethylene ranging in thickness from 0.001 to 0.006 mil, in specific gravity from 0.941 to 0.965 and in softening point from greater than 325 to 400 F.
  • a selected sealing temperature of 350 F. causes welding of valve ply 26 to bag 10 but no welding of valve ply 28 to bag 10.
  • a self-sealing container comprising (a) walls forming a container,
  • valve comprising a pair of flexible plastic panels joined about portions of their margins
  • said one panel being formed with an opening in register with said wall opening and being bonded thereto at least about said opening
  • the other of said panels being formed from a material having a heat sealing characteristic higher than that of said wall or said other panel.
  • valve panels form an open-ended sleeve, said open end being free from said wall.
  • a self-sealing container according to claim 1 wherein said container is a flexible tube sealed at both ends.
  • a self-sealing container comprising (a) walls forming a container,
  • valve comprising a pair of flexible plastic panels joined about portions of their margins
  • one of said panels being formed with an opening in register with said wall opening and being bonded thereto at least about said opening
  • a self-sealing container according to claim 6 including a protective ply detachably covering said adhesive coated side and adapted to be removed prior to sealing said opening.
  • a self-sealing container comprising (a) planar walls of uniformly thick flexible heat sealable material connected to define a bag,
  • each of said walls being fabricated with at least two plies of said material
  • each of said plies being formed with a plurality of spaced perforations

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Cartons (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
US414072A 1964-11-27 1964-11-27 Self-sealing valve bag Expired - Lifetime US3268152A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US414072A US3268152A (en) 1964-11-27 1964-11-27 Self-sealing valve bag
GB1424/65A GB1093212A (en) 1964-11-27 1965-01-12 Improvements in or relating to self-sealing container and method of making same
AT33865A AT269733B (de) 1964-11-27 1965-01-15 Verfahren zum Herstellen eines selbstabdichtenden Behälters
ES0308584A ES308584A1 (es) 1964-11-27 1965-01-26 Perfeccionamientos introducidos en envases de autocierre.
NL6501638A NL6501638A (da) 1964-11-27 1965-02-10
CH272665A CH437997A (de) 1964-11-27 1965-02-26 Selbstschliessender Beutel und Verfahren zu dessen Herstellung
DK144565AA DK108446C (da) 1964-11-27 1965-03-20 Ventilpose af formstoffolie.
BE669397D BE669397A (da) 1964-11-27 1965-09-09

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US414072A US3268152A (en) 1964-11-27 1964-11-27 Self-sealing valve bag

Publications (1)

Publication Number Publication Date
US3268152A true US3268152A (en) 1966-08-23

Family

ID=23639844

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Application Number Title Priority Date Filing Date
US414072A Expired - Lifetime US3268152A (en) 1964-11-27 1964-11-27 Self-sealing valve bag

Country Status (8)

Country Link
US (1) US3268152A (da)
AT (1) AT269733B (da)
BE (1) BE669397A (da)
CH (1) CH437997A (da)
DK (1) DK108446C (da)
ES (1) ES308584A1 (da)
GB (1) GB1093212A (da)
NL (1) NL6501638A (da)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313472A (en) * 1966-03-03 1967-04-11 Tjerneld Stig Flexible bags
US3322327A (en) * 1966-06-02 1967-05-30 Nat Distillers Chem Corp Internal j-shaped valve for flexible bags
US4715494A (en) * 1985-03-13 1987-12-29 Dunlop Limited A British Company Internally pressurized package with heat-sealable closure member
US5018646A (en) * 1988-11-23 1991-05-28 S. C. Johnson & Son, Inc. Squeezable fluid container
US6149304A (en) * 1997-05-09 2000-11-21 The Procter & Gamble Company Flexible storage bag with selectively-activatible closure
US20090120931A1 (en) * 2007-11-08 2009-05-14 Pouch Pac Innovations, Llc Flexible Tube Package And Method Of Forming
US9751661B2 (en) 2004-08-03 2017-09-05 Pouch Pac Innovations, Llc Flexible pouch and method of forming flexible pouch
US11208317B2 (en) * 2019-08-05 2021-12-28 The Boeing Company Flexible packaging for temperature sensitive materials

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG80533A1 (en) * 1995-01-25 2001-05-22 Sealed Air Corp Inflatable cushion and method of making same
JPH11504885A (ja) * 1995-01-25 1999-05-11 シールド エア コーポレーション 膨張クッション及びその製造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2593328A (en) * 1948-07-13 1952-04-15 John W Meaker Perforated multiple ply bag
US3089636A (en) * 1962-02-01 1963-05-14 Thermoplastic Ind Inc Self-sealing container
US3116002A (en) * 1961-06-22 1963-12-31 Ex Cell O Corp Container with pouring lip
US3180558A (en) * 1962-02-07 1965-04-27 Stamicarbon Plastic valve bag

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2593328A (en) * 1948-07-13 1952-04-15 John W Meaker Perforated multiple ply bag
US3116002A (en) * 1961-06-22 1963-12-31 Ex Cell O Corp Container with pouring lip
US3089636A (en) * 1962-02-01 1963-05-14 Thermoplastic Ind Inc Self-sealing container
US3180558A (en) * 1962-02-07 1965-04-27 Stamicarbon Plastic valve bag

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313472A (en) * 1966-03-03 1967-04-11 Tjerneld Stig Flexible bags
US3322327A (en) * 1966-06-02 1967-05-30 Nat Distillers Chem Corp Internal j-shaped valve for flexible bags
US4715494A (en) * 1985-03-13 1987-12-29 Dunlop Limited A British Company Internally pressurized package with heat-sealable closure member
AU577675B2 (en) * 1985-03-13 1988-09-29 Dunlop Limited Pressure tight packaging container
US5018646A (en) * 1988-11-23 1991-05-28 S. C. Johnson & Son, Inc. Squeezable fluid container
US6149304A (en) * 1997-05-09 2000-11-21 The Procter & Gamble Company Flexible storage bag with selectively-activatible closure
US9751661B2 (en) 2004-08-03 2017-09-05 Pouch Pac Innovations, Llc Flexible pouch and method of forming flexible pouch
US20090120931A1 (en) * 2007-11-08 2009-05-14 Pouch Pac Innovations, Llc Flexible Tube Package And Method Of Forming
US11208317B2 (en) * 2019-08-05 2021-12-28 The Boeing Company Flexible packaging for temperature sensitive materials

Also Published As

Publication number Publication date
DK108446C (da) 1967-12-11
AT269733B (de) 1969-03-25
NL6501638A (da) 1966-05-31
BE669397A (da) 1966-03-09
GB1093212A (en) 1967-11-29
ES308584A1 (es) 1965-08-16
CH437997A (de) 1967-06-15

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