US3877197A - Method and apparatus for filling and sealing plastic containers - Google Patents

Method and apparatus for filling and sealing plastic containers Download PDF

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Publication number
US3877197A
US3877197A US341605A US34160573A US3877197A US 3877197 A US3877197 A US 3877197A US 341605 A US341605 A US 341605A US 34160573 A US34160573 A US 34160573A US 3877197 A US3877197 A US 3877197A
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United States
Prior art keywords
container
aperture
gas
sealing
orifice
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Expired - Lifetime
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US341605A
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English (en)
Inventor
Kenneth Cayton
Grahame Melvin Reade
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Imperial Chemical Industries Ltd
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Imperial Chemical Industries Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B55/00—Preserving, protecting or purifying packages or package contents in association with packaging
    • B65B55/20—Embedding contents in shock-absorbing media, e.g. plastic foam, granular material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B65B31/04—Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied
    • B65B31/046—Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied the nozzles co-operating, or being combined, with a device for opening or closing the container or wrapper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof

Definitions

  • the invention relates particularly to the filling and sealing of flexible plastics containers containing liquids under pressure, including liquids containing dissolved gases, such as beer and carbonated soft drinks, and liquids which are packed under pressure of a gas that is not soluble in the liquid, to give substantially rigid packs. It may be applied also to the packaging of solid articles, the pack being pressurized to make it rigid, usually for the purpose of protecting the contents or to improve the sale appeal of the pack, and to the packaging of particulate solids.
  • the invention includes the fill ing of the container with gas alone under superatmospheric pressure.
  • the term over an orifice includes any case where the container is located so that the aperture covers the orifice. irrespective of whether the surface containing the orifice is generally located above, beneath or beside the container.
  • the expression closed container means that the container is gas-tight, in respect of the pressure of gas to be reached within the container, except at the aperture provided for pressurizing the container and at any further aperture in the wall of the container that may be held in gas-tight contact with a surface and sealed in similar manner to the aperture described.
  • fully inflated means that the pressure inside the container is at least sufficient to enable 7 the container wall to be pneumatically held in substantially gas-tight contact with the surface.
  • the container When the container is to be filled with a liquid or particulate solid, this is preferably introduced through the aperture after the container has been inflated with gas. It may be introduced through the same orifice as the gas, or through a closely adjacent second orifice that is also covered by the aperture in the container, or through a second orifice spaced from the first orifice, to which the inflated container may be slid after it has been pressurized at the first orifice.
  • the package When the package is to contain a solid article or articles these are preferably put into the container before it is closed, and the container is subsequently pressurized and sealed in the manner described.
  • the method of the invention is used with particular advantage in the packaging of beer and carbonated soft drinks in flexible plastics containers.
  • the invention of application Ser. No. 271,208 filed Dec. 7, 1972 further provides apparatus for performing a method as described, that includes a smooth surface having therein an orifice; means for supplying a sealing strip in such a manner that it may be drawn from its source of supply along a path on said surface, or on a second surface substantially continuous therewith and in line with the orifice; means for supplying through the orifice a gas for inflating to superatmospheric pressure a plastics film container presented to said surface with an aperture in its wall located over said orifice; means for holding the container sufficiently under compression against said surface or surfaces to maintain a seal around said aperture, while it is slid along said surface or surfaces to bring said aperture into the path of said sealing strip and until the sealing strip covers and surrounds the aperture; and, if necessary, means for heat sealing the sealing strip around the aperture.
  • the seal in heat-sealing the flexible sealing strip to the wall of the container around the filling aperture, the seal can be improved if the sealing strip and the container wall surrounding the aperture are supported during sealing upon a curved protrusion on the surface against which the inflated container is held.
  • the seal may then be produced without any puckering of the container wall or of the sealing patch, and the seal much improved in strength and reliability.
  • a method as claimed in application Ser. No. 271,208 filed Dec. 7, 1972 is further characterized in that the flexible sealing strip and the container wall surrounding the aperture are supported, during the sealing of the strip to the wall of the container, upon a surface that follows effectively a convex curve across each and any diameter of the area supporting the portion of the strip that is to be sealed to the container and the container wall surrounding said portion.
  • an apparatus as claimed in application Ser. No. 271,208 filed Dec. 7, 1972 is further characterized in that the part of the surface that supports the portion of the sealing strip that is to be sealed to the container, and the container wall surrounding said portion, during the sealing of the strip to the wall of the container, follows effectively a convex curve across each and any diameter thereof.
  • the supporting surface ideally follows a true curve across each and any diameter thereof, the surface may for ease of machining be shaped across at least one diameter as a series of flats giving the effect of a convex curve.
  • FIG. 1 is a side view, seen partly in section, of the filling and sealing apparatus
  • FIGS. 2 to 6 show in more detail the shape of the surface upon which the flexible sealing strip is supported in the apparatus of FIG. 1;
  • FIG. 7 shows schematically the supply-lines for the beer and for carbon dioxide for pressurizing the pouches.
  • FIG. 8 shows a plastics-film pouch suitable for use in the method of the invention.
  • FIG. 1 l is a magazine of plastics-film tubular pouches to be filled;
  • 2 is a block, suitably of stainless steel, constituting the pressurizing and filling head, provided with a smooth, flat front surface, 3, in which are a filling orifice, 4, and concentric with and surrounding the filling orifice, a pressurizing orifice 5;
  • 6, 7 are a pair of blocks, again suitably of stainless steel, separated by a narrow gap, 8, suitably about 0.005 inch wide, and having their smooth, flat front faces level with that of block 2, the face of block 6 being contiguous with that of block 2.
  • the tape having a heat-sealable coating on the surface that faces the block 6.
  • 10 is the heat-sealer block, whose front face is of a curved shape to be more particularly described, across which passes a heat-sealer element, 11.
  • the heat-sealer block 10 which is of heat-insulating material such as a bonded fabric laminate, is separated from block by a narrow gap through which operates a retractable knife, 12. 13 is a chute into which filled packs are ejected.
  • a pair of parallel rails the upper of which is shown at 14, for supporting inflated packs pressed against them, and a rod, 15, parallel with the rails 14, upon which is driven a reciprocating cylinder, 16; to this cylinder are attached two pairs of vertically-spaced pawls for pushing the pressurized and filled packs to the right (as seen in the drawing), the upper pawls of the two pairs being shown at 17, 18.
  • a reciprocable vacuum-pad 19 which may be advanced to take a plastics-film pouch, 20, from the magazine, and transfer it, on movement of the cylinder 16 to the right (as seen in the drawing), to a position against the pressurizing and filling block, 2.
  • the plastics-film pouches which are closed by gastight seals except for a circular filling aperture in the wall of each, are accurately located in the magazine with their filling apertures in a predetermined position.
  • successive pouches may be indexed by the vacuum pad 19 to a position in which the filling aperture is opposite and adjacent to the orifices 4, 5 in the pressurizing and filling block 2.
  • the cylinder 16 again advances to the right, and the filled pack 21 is pushed by pawls 17 past the sealing tape supply slot and on until its filling aperture is opposite the heat-sealer element 11; a pack in this position is shown at 22.
  • the leading end 23 of the sealing tape is carried forward upon the pack by frictional forces, and further tape is withdrawn from roll 9, until the tape covers and extends beyond the filling aperture.
  • the pack has a patch of sealing tape covering its filling aperture.
  • FIGS. 2 to 6 The shape of the heat-sealer block 10 is shown in FIGS. 2 to 6 of which: FIG. 2 is a plan; FIGS. 3 and 4 are side and end views respectively; and FIGS. 5 and 6 are sections through A,A and B,B of FIG. 2, respectively.
  • the pack approaches the heat-sealer blocks as shown in FIG. 2 from the left-hand side.
  • FIGS. 2 to 6 The shape of the heat-sealer block 10 is shown in FIGS. 2 to 6 of which: FIG. 2 is a plan; FIGS. 3 and 4 are side and end views respectively; and FIGS. 5 and 6 are sections through A,A and B,B of FIG. 2, respectively.
  • the pack approaches the heat-sealer blocks as shown in FIG. 2 from the left-hand side.
  • FIGS. 1 In a particular example of a heat-sealer block as shown in FIGS.
  • the surface shape is produced by a transverse spherical curvature of 31.75 mm on which is imposed, longitudinally, a flat from the left-hand side as shown, at an angle of 8, and a flat from the right-hand side at an angle of 5, separated by a 0 flat 10 mm in length at the position of the heat-sealer element 11, the three flats giving an effective radius of curvature, from a line perpendicular to the center point of the 10 mm flat, of approximately 92.5 mm.
  • Suitable curvatures for heat-sealer blocks for sealing packs of different sizes may be determined by experiment. Generally, the larger the diameter of the pack, the larger are the preferred curvatures of the heatsealer block.
  • FIG. 7 are shown schematically the supply lines for the carbon dioxide and beer.
  • the gas and beer are supplied to the pouches through concentric orifices; for simplification and clarity, however, the two supply systems are shown in FIG. 7 on separate sides of the pack. Both systems provide for any carbon dioxide and beer entering the pouches to be maintained in a substantially sterile condition.
  • 21 represents the pouch being pressurized and filled, 24 the line to the supply source of carbon dioxide. which is suitably maintained at a pressure of about 20 psi, and 25 the line to the beer supply, suitably maintained at a pressure of about 30 psi.
  • 26 is an on/off valve, 27 a nonreturn valve, and 28 the line to orifice 5 (FIG. 1); while 29 is a line to a drain, through non-return valve 30 and pressure-relief valve 31, the latter being set at 20 psi or other pressure desired in the filled pack.
  • the on/off valve 26 for the carbon dioxide is turned on for the initial inflation of the pouch, and remains on until just before the filled pack is moved from block 2 and slid along to be heat-sealed.
  • the measured amount of beer is pumped into it through line 25.
  • FIG. I has been described as a side view, the apparatus is in fact arranged during operation so that the surface 3 is in a downwardly facing position indined at a small angle to the horizontal.
  • the container may then be sufficiently filled with the beer, but a gas space still left under the filling aperture until the aperture has been sealed.
  • This gas space allows the surface of the container to be kept dry while the container is filled; it also facilitates heat sealing, since the loss of heat through the gas is much less than if a liquid were in contact with the film.
  • the apparatus is suitably tilted until surface 3 is at an angle of about 45 to the horizontal.
  • FIG. 8 a plastics-film pouch suitable for use in the method of the invention.
  • This is a preferred form of pouch produced in the manner described in our copending Application Ser. No. 311,154, filed Dec. 1, 1972, which describes a method of closing an open end of a plastics-film container that comprises forming an elongated heat-seal between the flat, opposed layers of the plastics film at or towards their edges and along the whole length of said open end, folding the end of the container over, inwardly of the seal, so that the heatseal lies wholly against the external surface of one wall of the container, and adhering the folded-over end in such position by means ofa strip offlexible material adhered over the edge region of the folded-over end, along substantially the whole length thereof, and extending beyond the inner edge of the heat-seal, and to the adjacent portion of the container wall.
  • a reinforcing ribbon is first adhered to the outer side of the seal, extending beyond its edge, and the strip of flexible material extends over the fold of the folded-over end with its ends projecting beyond the sides of the container, the opposed edges of the strip being adhered one to the other in this region.
  • 34 is the flat, empty plastics-film pouch; 35 is the filling aperture in its wall; 46 is the heat-sealed, folded-over end; 47 is the edge of the seal-reinforcing ribbon; and 48 is the strip of flexible material extending over the fold of the folded-over end, the projecting ends of the strip, adhered together, being shown at 49.
  • the pouch has been filled and sealed it assumes a cylindrical form over the major part of its length, but has chisel-shaped, or saddle-shaped, ends as indicated in the packs shown at 21, 22 in FIG. 1.
  • Types of plastics'film pouches other than that particularly described may be used provided that they are of sufficient strength, are formed with gas-tight seals, and are provided with a filling aperture in their wall.
  • pouches formed of biaxially oriented polyethylene terephthalate film are especially suitable, particularly when coated with a heat-scalable, gas-impermeable coating, for example a coating of vinyliden e chloride copolymer.
  • the coating may be an external coating or an internal coating.
  • Hot melt adhesives particularly when used on a plastics film of the same type as used for the construction of the container, are generally preferred. Particularly suitable hot melt adhesives include those based on copolymers of two or all of the acids sebacic, terephthalic and isophthalic acid condensed with ethylene glycol. Hot melt adhesives based on ethylene/vinyl acetate copolymers are also suitable. It is also possible to use for sealing the filling aperture a sealing strip bearing a pressure sensitive adhesive coating effective at room temperature.
  • the filled packs are preferably provided with a sleeve of paper, foil or other flexible sheet material, preferably formed by wrapping or winding around substantially the whole of the cylindrical part of the pack a sheet or strip of the sheet material and securing it by means of an adhesive, such as a moisture-activated adhesive, applied at least to the edges of the sheet. If the sleeve is applied closely to the container while the contents are cold, subsequent slight expansion of the container results in the container walls being firmly supported by the sleeve. This gives added strength to the pack and also provides for its labelling and decoration.
  • the sleeve may be extended at one end to form a stand. When pouches as shown in FIG.
  • the sleeve preferably extends just over, the edge of the reinforcing strip 47 at each end of the pack, the ends of the adhered edges 48 of the strip being folded down upon the walls of the pack when they are covered by the sleeve.
  • the finished pack then has a neat appearance, and can be made attractive by print applied to the sleeve.
  • an apparatus for filling and sealing a flexible plastics container comprising a smooth surface having therein an orifice, means for supplying and means for supporting a sealing strip in such manner that it may be drawn from its source of supply along a path substantially continuous with said surface and in line with but in a direction away from said orifice, means for supplying through said orifice a gas for inflating to superatmospheric pressure a plastics-film container presented to said surface with a filling aperture in its wall located over said orifice, a support means for holding the container sufficiently under compression against said surface to maintain a substantially gas-tight seal around said aperture while the container is slid along said surface to bring said aperture into the path of said sealing strip and until the sealing strip covers and surrounds said aperture, and means for causing sealing of the sealing strip to the container wall: the improvement consisting in that the surface of said means for supporting the sealing strip follows effectively a convex curve across each and any diameter thereof.
  • An apparatus as claimed in claim 4 that includes means for heating the convexly curved surface of said means for supporting the sealing strip, such that said surface constitutes a heat-sealer for said sealing strip.
  • first container moving means for moving a plasticsfilm container which is closed except for an aperture in a wall of the container into a position such that the aperture is in register with the orifice;
  • container support means for holding the inflated container under sufficient pressure against said smooth surface so as to maintain a substantially gas-tight seal around said aperture
  • second container moving means for moving the inflated container between the container support means and the smooth surface so that the aperture is moved out of register with the orifice but so that the aperture remains in contact with the said smooth surface, thereby maintaining the inflation of the container;
  • sealing strip supply means for supplying a sealing strip in such a position that the sealing strip is engaged by the container wall and covers and surrounds the aperture
  • sealing means having a sealing support surface for supporting the sealing strip and the surrounding portion of the container wall and causing sealing of the sealing strip to the container wall;
  • the improvement comprising a sealing support surface which follows effectively a convex curve across each and any diameter thereof.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Basic Packing Technique (AREA)
  • Package Closures (AREA)
  • Vacuum Packaging (AREA)
US341605A 1972-03-28 1973-03-15 Method and apparatus for filling and sealing plastic containers Expired - Lifetime US3877197A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1445172A GB1420951A (en) 1972-03-28 1972-03-28 Method and apparatus for filling and sealing plastics containers

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US3877197A true US3877197A (en) 1975-04-15

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JP (1) JPS5137599B2 (enrdf_load_html_response)
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4834554A (en) * 1987-11-16 1989-05-30 J. C. Brock Corp. Plastic bag with integral venting structure
US5433061A (en) * 1991-06-06 1995-07-18 Ricegrowers' Co-Operative Limited Air removal apparatus
US5532011A (en) * 1993-08-11 1996-07-02 Goglio; Luigi Process for packaging coffee
US6231907B1 (en) * 1996-03-26 2001-05-15 Pokka Corporation Method for producing high-quality drinks filled in containers
US20050106291A1 (en) * 2001-12-20 2005-05-19 Masahiko Kawashima Method for producing gas exchange package
US20070095424A1 (en) * 2002-10-07 2007-05-03 Becton, Dickinson And Company Retainer for filling a container having at least one flexible component
US20100281831A1 (en) * 2009-05-05 2010-11-11 Sealed Air Corporation US Inflatable mailer, apparatus, and method for making the same
US20110068154A1 (en) * 2009-05-05 2011-03-24 Sealed Air Corporation (Us) Inflatable Mailer, Apparatus, and Method for Making the Same
CN112389719A (zh) * 2017-08-15 2021-02-23 汉美驰品牌有限公司 具有两级密封的真空密封器

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62161011A (ja) * 1986-01-09 1987-07-17 Sakura Sogyo Kk ガラス製たる状気泡管の製造方法
JPS6434225A (en) * 1987-07-31 1989-02-03 Yusuke Sakai Live fish tank
JPH0263661U (enrdf_load_html_response) * 1988-11-04 1990-05-14

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2638963A (en) * 1949-03-31 1953-05-19 Us Army Apparatus for dielectric fabrication
US3745024A (en) * 1968-02-29 1973-07-10 Ici Ltd Method and apparatus for filling and sealing flexible containers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2638963A (en) * 1949-03-31 1953-05-19 Us Army Apparatus for dielectric fabrication
US3745024A (en) * 1968-02-29 1973-07-10 Ici Ltd Method and apparatus for filling and sealing flexible containers

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4834554A (en) * 1987-11-16 1989-05-30 J. C. Brock Corp. Plastic bag with integral venting structure
US5433061A (en) * 1991-06-06 1995-07-18 Ricegrowers' Co-Operative Limited Air removal apparatus
US5532011A (en) * 1993-08-11 1996-07-02 Goglio; Luigi Process for packaging coffee
US5768859A (en) * 1993-08-11 1998-06-23 Goglio; Luigi Installation for packaging coffee
US6231907B1 (en) * 1996-03-26 2001-05-15 Pokka Corporation Method for producing high-quality drinks filled in containers
US20050106291A1 (en) * 2001-12-20 2005-05-19 Masahiko Kawashima Method for producing gas exchange package
US7165376B2 (en) * 2001-12-20 2007-01-23 Asahi Kasei Life & Living Corporation Method for producing gas exchange package
US20070095424A1 (en) * 2002-10-07 2007-05-03 Becton, Dickinson And Company Retainer for filling a container having at least one flexible component
US20100281831A1 (en) * 2009-05-05 2010-11-11 Sealed Air Corporation US Inflatable mailer, apparatus, and method for making the same
US20110068154A1 (en) * 2009-05-05 2011-03-24 Sealed Air Corporation (Us) Inflatable Mailer, Apparatus, and Method for Making the Same
US8468779B2 (en) * 2009-05-05 2013-06-25 Sealed Air Corporation (Us) Method and apparatus for positioning, inflating, and sealing a mailer comprising an inner inflatable liner
US8745960B2 (en) * 2009-05-05 2014-06-10 Sealed Air Corporation (Us) Apparatus and method for inflating and sealing an inflatable mailer
CN112389719A (zh) * 2017-08-15 2021-02-23 汉美驰品牌有限公司 具有两级密封的真空密封器

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Publication number Publication date
GB1420951A (en) 1976-01-14
DE2315248A1 (de) 1973-10-11
FR2179757A1 (enrdf_load_html_response) 1973-11-23
JPS4914275A (enrdf_load_html_response) 1974-02-07
AU475981B2 (en) 1976-09-09
FR2179757B1 (enrdf_load_html_response) 1976-05-21
AU5335773A (en) 1974-09-19
JPS5137599B2 (enrdf_load_html_response) 1976-10-16

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