US3481100A - Method and apparatus for packaging in protective atmosphere - Google Patents

Method and apparatus for packaging in protective atmosphere Download PDF

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Publication number
US3481100A
US3481100A US596581A US3481100DA US3481100A US 3481100 A US3481100 A US 3481100A US 596581 A US596581 A US 596581A US 3481100D A US3481100D A US 3481100DA US 3481100 A US3481100 A US 3481100A
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US
United States
Prior art keywords
container
chamber
flange
package
protective atmosphere
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
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US596581A
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English (en)
Inventor
Roger C Bergstrom
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.)
SPX Flow Technology Systems Inc
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Anderson Bros Manufacturing Co
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Assigned to ANDERSON BROS. MFG CO A DE CORP reassignment ANDERSON BROS. MFG CO A DE CORP ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ANDERSON BROS. MFG CO
Assigned to APV ANDERSON BROS. INC. reassignment APV ANDERSON BROS. INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ANDERSON BROS. MFG. CO.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B65B31/02—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas
    • 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
    • B65B31/02—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas
    • B65B31/021—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas the containers or wrappers being interconnected

Definitions

  • the present invention relates generally to packaging and more particularly to method and apparatus for packaging in a protective atmosphere.
  • Another object of this invention is to provide packaging apparatus, and a method of packaging, for evacuating and gassing a container with a protective atmosphere.
  • Still another object is to provide a method and apparatus for packaging in a protective atmosphere in which a chamber surrounding the package is evacuated and the protective atmosphere is passed into the package and therefrom in the chamber.
  • FIG. 5 is a partial sectional view taken generally along line 55 of FIG. 4;
  • a preselected quantity of a product P is dispensed into the container C.
  • the product P may be any type which may be handled and packaged, in accordance with the present invention it would be a product advantageously packaged in a protective atmosphere such as carbon dioxide, nitrogen, argon, active nitrogen, or the like.
  • a channel 59 is preferably formed in Wall 56 and peripheral portion 58 in the area of opening 30 to provide communication with the interior of container C. While channel 59 is herein illustrated as being formed in inner cover I, it may be formed in the container C as, for example, in side wall 26 and the flange member. The advantages of channel 59 will hereinafter become more apparent.
  • a third roll 60 is supported on the apparatus, and a thin, flexible sheet 61 is withdrawn therefrom.
  • Sheet 61 is advantageously stretchable and adapted to be sealed to the flange member of container C along a preselected peripheral area.
  • compatible thermoplastic materials are selected for web 11 and sheet 61, and the sealing may be accomplished by heat sealing. It should be understood, however, that other materials may be utilized and that other sealing methods may be used. It is preferable, however, that sheet 61 which provides the cover member of the finished package, be flexible for a purpose hereinafter to become apparent.
  • Sheet or cover member 61 is placed in juxtaposition to the flange member, as shown, and the container C, inner cover I, and cover member 61 advanced to an evacuable chamber, generally designated X, and illustrated in detail in FIGS. 4-6.
  • an evacuable chamber generally designated X, and illustrated in detail in FIGS. 4-6.
  • the air is evacuated from the chamber and container C, a protective atmosphere of a preselected type is introduced through the opening 30 into the container C, and the cover member 61 is thereafter hermetically sealed to the outer flange portion 29 and inwardly of the opening 30.
  • a plurality of scaled packages is interconnected in a continuous web as illustrated in FIG. 1.
  • the web of sealed packages is advanced to another station 64 where the packages are cut from the web by cutters 65 and 66.
  • the completed packages are deposited on a conveyor 68, and the waste portion of the web is fed out of the machine and conveniently cut into small waste sections by cutters as at 69.
  • the continuously web is conveniently cut inside of the outer extremity of the seal area elfectuated at chamber X to insure that the seal between cover member 61 and outer flange portion 29 extends entirely to the edge. This provides a very neat package with no loose outer cover. If desired, a peel portion of any desired length may be formed outwardly of the seal area in any convenient manner.
  • the evacuable chamber includes a lower member 71, movable in a vertical direction by any convenient means.
  • the lower member 71 engages with an upper member 72 to form a substantially air-tight enclosure.
  • a gasket 73 conveniently at the top of the lower member engages with peripheral part 74 of the upper member 72 to insure that the enclosure thus formed is substantially gas-tight.
  • the lower member 71 is formed with a lower cavity 78 shaped for receiving the containers C therein.
  • the upper member 72 describes an upper cavity 79 which is in communication with the lower cavity 78 via passage 76 in lower member 71, as shown in FIG. 4.
  • a heat sealing head 82 Disposed in the upper cavity 79 is a heat sealing head 82 having projecting parts 83 of a shape generally corresponding to the flange member for sealing the cover member 61 thereto.
  • Sealing head 82 is movable between a position removed from the cover member, as shown in FIGS. 4 and 5, and a sealing position engaged with the cover member, as shown in FIG. 6.
  • the sealing head may be heated in any convenient manner; or may be adapted for pressure sealing if a pressure-sensitive adhesive is utilized. Ultrasonic or high frequency sealing and other sealing methods may also be used, if desired.
  • Sealing head 82 is conveniently provided with openings 84 as an aid in evacuating the cavities 78 and 79, If desired, sealing head 82 may be kept stationary and lower member 71 moved upwardly for the sealing operation.
  • the cavities 78 and 79 can be placed in communication with the atmosphere or with a vacuum pump (not shown) by means of a valve 86 connected to chamber outlet conduit 87, pump conduit 88, and atmosphere conduit 89.
  • the lower member 71 is lowered relative to the upper member 72 and the container C, inner cover I, and cover member 61 are moved in the direction indicated by arrow g in FIGS. 1 and 2.
  • the container C is supported by a plate 92 (see FIG. 2) during the early part of this movement, from which it is transferred to the chamber X.
  • Lower member 71 is then moved upwardly by means not illustrated until the gasket 73 comes into contact with the upper member 72 or clamps the flange portion 29 and cover member 61 therebetween. It will be noted that the opening, olfset toward side wall 26, is disposed inwardly of said clamping.
  • Valve 86 is now operated so that conduit 88, which is connected to a vacuum pump, is placed in communication with outlet conduit 87, and the pressure within the cavity 79 is reduced to a value below atmospheric. Moreover, since cavity 79 is communicated with cavity 78 by conduit 76, the pressure in this lower part is likewise reduced.
  • the interior of the container C'and the space between inner cover I and a cover member 61 is likewise reduced through flow of air through channel 59 and gaps as at 93 (see FIG. 4) caused by the air pushing out and flexing the cover member 61 somewhat as a result of the pressure differential.
  • a high vacuum is drawn; for example, around 27-29 inches of mercury.
  • lower member 71 is provided with a passage 95 communicating with opening 30.
  • a supply of protective atmosphere 96 is connected to passageway 95 by means of a conduit 97.
  • a pressure regulator 98 is provided to control the pressure of the protective atmosphere flowed into the chamber.
  • a valve 99 is interposed in conduit 97, and a timer 100 is conveniently provided to control the valve between on and 011 positions. When valve 99 is turned on, the protecti ve atmosphere is allowed to flow through conduit 97, passageway 95 and opening 30. The force of this flowing gas is such to stretch cover member 61 slightly above the opening 30, and the gas flows into the container C through the gap thereby provided and through channel 59.
  • Timer 100 is arranged to allow flow of gas over a suflicient period of time to allow the pressure in the container and cavities to reach the pressure set on regulator 98. In accordance with the present invention, it is preferable that this pressure be approximately atmospheric so that the con tainer will neither bulge nor be collapsed when exposed to atmosphere. After the pressure in the container and cavities has reached the preselected amount, timer 100 turns off valve 99. In some cases to conserve gas, valve 86 is opened to atmosphere while the pressure in the cavities is subatmospheric, but after the pressure in the container C has been returned approximately to atmospheric.
  • Sealing head 82 and lower member 71 are then moved relative to each other by any convenient means.
  • projecting parts 83 of sealing head 82 press the cover member 61 into contact with the outer flange portion 29, sealing the two together to provide a gas-tight package.
  • the projecting part 83 is also advantageously arranged to engage the portion of channel 59 formed in peripheral portion 58 and depress the channel into engagement with inner flange portion 28 as shown in FIG. 6. In this manner, at least a portion of the channel is ironed out during the sealing operation.
  • inner cover I is advantageously formed of a material which will be ironed out by the sealing head.
  • polyvinyl chloride is used, and heat is applied during the sealing process.
  • the application of heat to channel 59 causes it to resume its original, predeformed state.
  • the head 82 is returned to its upper position, valve 86 is operated to connect the outlet conduit 87 to atmosphere conduit 89, and the lower member 71 is lowered to allow the sealed package to be removed from the evacuable chamber X.
  • a method of packaging includes forming the cup-like container C having an out-turned flange member at the upper end thereof.
  • a predetermined quantity of the product P is deposited into the container, and cover member 61 placed in juxtaposition to the flange member for hermetically sealing thereto along a preselected area having an inner seal line.
  • opening 30 is formed, as by punching, in the flange member outwardly of the inner seal line.
  • the container C and the cover member 61 are placed in the evacuable chamber X, and the cover member '61 is clamped to the outer flange member 29 outwardly of opening 30 and at two opposite sides of the container.
  • the protective atmosphere is introduced directly into the package rather than merely into the evacuated chamber surrounding the package. This is particularly significant when a lighter-than-air gas, such as hydrogen, is utilized.
  • the present invention provides a useful packaging method and apparatus which has advantages of both vacuum and gas flush packaging.
  • the protective atmosphere is directed into the package and therefrom into the chamber, and the present invention accomplishes this without the use of any apparatus extending into the package. Additionally, it can be seen that the sealing is advantageously accomplished in a single operation.
  • a method of packaging including forming a cuplike container having an out-turned flange member at the upper end thereof, depositing a predetermined quantity of a material to be packaged into the container, and positioning a cover member in juxtaposition to the flange member for sealing thereto along a preselected peripheral area which defines an inner seal line, the improvement comprising the steps of: forming a first opening in one of said members outwardly of the inner seal line, placing said members in an evacuable chamber, holding the cover member in juxtaposition to the flange member while maintaining an unsealed relationship therebetween to provide communication between the container and chamber, reducing the air pressure in the chamber by drawing a vacuum through a second opening spaced from the first opening and causing the air in the container to flow between the unsealed members into the chamber, introducing a protective atmosphere through said first opening and against the opposite member and between said unsealed members into the container and therefrom into the chamber to flush residue of air from the container, thereafter hermetically sealing the cover member to the flange member along said
  • a method as set forth in claim 3 including ironing out at least a portion of the channel during the sealing step.
  • a packaging apparatus including first forming means for forming a container having an outturned peripheral flange member with inner and outer portions at the open end thereof; means for depositing a quantity of a material to be packaged into the container; means for positioning a cover member overlying the container and in juxtaposition to the flange member; an exacuable chamber including upper and lower enclosing means movable relative to each other between one position to provide a substantially gas-tight chamber and a second position removed from the one position to provide an opening for entry of the container and cover member, said upper and lower enclosing means operative in the one position to support the container and cover member; and means communicating with the chamber outwardly of the container for reducing the pressure in the chamber and container to a value below atmospheric; the improvement comprismg:
  • a sealing head disposed in the chamber above the cover member and having a lower portion shaped for hermetically sealing the cover member to the flange member and inwardly of the flange opening;
  • first forming means for forming a container having at the open end thereof an out-turned peripheral flange with inner and outer portions;
  • second forming means for forming an inner cover for spanning the open end of the container
  • one of the first and second forming means being operative to form a shape that disposes at least a portion of the inner cover away from the inner portion of the flange when positioned by the last-mentioned means to provide communication with the interior of the container;

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vacuum Packaging (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
US596581A 1966-11-23 1966-11-23 Method and apparatus for packaging in protective atmosphere Expired - Lifetime US3481100A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US59658166A 1966-11-23 1966-11-23

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US3481100A true US3481100A (en) 1969-12-02

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US (1) US3481100A (de)
CH (1) CH464775A (de)
DE (1) DE1561956A1 (de)
GB (1) GB1128800A (de)

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US3911640A (en) * 1972-08-11 1975-10-14 Tetra Pak Dev Method for the packing under aseptic conditions of sterile goods into containers
US3916602A (en) * 1974-11-21 1975-11-04 Maryland Cup Corp Method and apparatus for heat shrink capping containers
US3962844A (en) * 1974-08-21 1976-06-15 International Paper Company Process for forming and applying a hermetic, heat sealed closure
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GB1128800A (en) 1968-10-02
CH464775A (de) 1968-10-31

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