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Publication numberUS3104506 A
Publication typeGrant
Publication dateSep 24, 1963
Filing dateOct 26, 1960
Priority dateOct 26, 1960
Publication numberUS 3104506 A, US 3104506A, US-A-3104506, US3104506 A, US3104506A
InventorsRohdin Howard A
Original AssigneeRohdin Howard A
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method of sealing blister type packages
US 3104506 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)


United States Patent i a? ForestAve., Gienltidge, NJ.

on. 26, was, Ser. No. 65,189 2 cream. or. 53-42 It is an object of this invention to provide an improved method of sealing blister type packages of particular advantage where the contents is a perishable food-stuff.

The above and other objects will be made clear from the following detailed description taken in connection with the annexed drawings in which:

FTGURE 1 is a section through the dies for distorting and sealing the package;

FlGURE 2 is a View similar to FIGURE 1, showing a package and its lid in place; and

FIGURE 3 is a side elevation of the complete package.

in packaging perishable food products in transparent, thermoplastic blisters, for merchandising appeal, it is most desirable that the package appear absolutely full. This raises the problem, however, of possible contamination of the usual scalable flange around the mouth of the Such contamination may interfere with the efiicacy of the seal, when the lid is applied. Worse yet, contamination may extend outside the area of the seal, with the result that the package may have spoiled foodstuif in its margin. Even with the closest, hence most costly inspection, such packages may reach the consumer, with consequent loss of good will.

The present invention provides a solution to the foregoing problem by creating, at the time of filling a distortion of the blister to increase its intended capacity. The blister then is filled to a level below that of the flange, thereby avoiding the possibility of contamination on the flange. The lid is then heat sealed to the flange and the distortion is removed to bring the package to full condition.

Referring now to FIGURE 1, there is shown a female die 18 having a package receiving pocket 12, the bottom of which has a sunken portion 14. At the top, adjacent the pocket 12 and surrounding the same is a pressure supporting surface 16. The pocket, except for the sunken portion 14 is the shape of the blister portion of the ultimate package. A heated die 18, conforming in shape to the surface 16 is movable toward and from that surface by conventional means. A duct 20 is formed in the base of the die and communicates with the sunken portion 114.

In FIGURE 2 a blister 22 has been placed in the pocket 12. The blister has the usual peripheral flange 24. Vacuum is pulled through the duct to draw the normally flat bottom of the blister 22 into the sunken portion 14, thereby temporarily increasing the capacity of the blister. The blister is then filled to a level indicated by the line 26, the quantity of contents of the blister being that normally required to fill the blister to the level of the flange 24. A lid 28 is then placed over the flange 24, and the die 18 is lowered to form a heat seal Patented Sept. 2%., 1963 between the lid 28 and the flange 24. The vacuum is then released through the duct 28, whereupon the bottom 38 or" the blister springs back to flattened condition on the line 32. It will be understood that the die 18 is not needed, and in any material capable of forming a selfsustaining blister, there will be no permanent set induced by the drawing of the bottom into the sunken portion 14.

FTGURE 3 shows the final package. Depending on the ma.erial used, there may be a slight upward bulge of the lid 28 to approximately the line 3 2-. Where such a bulge is objectionabie the sealing may be done under vacuum. It is also possible, and sometimes may be desirable to use a lid of material which will pass a particular gas, such, for example, as carbon dioxide, and then to fill the space above the line 26 with such gas to displace the air which otherwise would be present. After the seal is made, and the vacuum released, the gas'will pass through the lid 23, which will then return to flat tened condition. Examples of such materials are polyethylene and most of the vinyl films.

it will be apparent that filling can be done through the heated die 18, and the lid 28 may be drawn over the blister 22, between the die 18 and the surf-ace 16. it will also be apparent that strips, or even entire sheets of blisters may be filled and sealed simultaneously, and such is entirely within the purview of this invention.

I claim:

1. A method of filling and sealing blister-type packages comprising: providing a die of the same shape as a blister to be filled, but of greater volume; placing a prefor-med, selfsustaining blister in said die; evacuating said die to draw said blister into conformity therewith; filling said blister with contents equal to its normal volume; lling the space above said contents with an inert gas; sealing a lid pervious to such gas on said blister and releasing the evacuation of said die.

2. A method of filling and sealing blister-type packages comprising: providing a blister, preformed of plastic material to its normal size and shape, said blister being self sustaining and of limited flexibility; distorting said blister to increase its internal volume; filling said blister with contents equal to the normal internal volume of the blister; thereafter filling an inert gas into the blister; sealing a lid on said blister, said lid being permeable to such gas, and restoring the blister to substantially its internal volume.

References Cited in the file of this patent UNITED STATES PATENTS 1,693,262 7 Taylor Nov. 27, 1928 2,293,142 Johnson Aug. 18, 1942 2,335,738 Casey Nov. 30, 1943 2,418,142 Socke Apr. 1, 1947 2,878,154 Cheney et al. Mar. 17, 1959 2,878,630 Strin et al Mar. 24, 1959 2,879,635 Brock Mar. 31, 1959 2,888,787 Cloud June 2, 1959

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1693262 *Jan 3, 1927Nov 27, 1928Borden CoMachine for treating and sealing cans
US2293142 *Aug 3, 1940Aug 18, 1942Johnson OgdenContainer and method of making containers
US2335738 *Jul 24, 1940Nov 30, 1943Dewey And Almy Chem CompPackaging machine
US2418142 *Sep 10, 1942Apr 1, 1947American Can CoBag loading machine
US2878154 *Dec 21, 1955Mar 17, 1959Dow Chemical CoMethod of sealing vinylidene chloride polymer surfaces to one another
US2878630 *Dec 13, 1954Mar 24, 1959American Cyanamid CoMachine for stripping capsules
US2879635 *Sep 27, 1957Mar 31, 1959William Brock HerbertMethod of packaging articles
US2888787 *Jan 11, 1957Jun 2, 1959William S CloudMethod and apparatus for vacuum packing in plastic
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3353325 *Feb 3, 1964Nov 21, 1967Mayer & Co Inc OPackaging of free flowing materials
US3418783 *Sep 16, 1965Dec 31, 1968Rodger D. CollonsMethod of sealing a container by vacuum
US3426939 *Dec 7, 1966Feb 11, 1969Young William EPreferentially deformable containers
US3492773 *Jan 25, 1967Feb 3, 1970Anderson Bros Mfg CoMethod of vacuum packaging
US3688464 *Feb 25, 1970Sep 5, 1972Continental Can CoMethod of and apparatus for closing container
US3714758 *Mar 26, 1971Feb 6, 1973Reynolds Metals CoMethod and apparatus for forming a depression in a cover member of a container construction
US4563861 *Feb 10, 1984Jan 14, 1986Societe Anonyme Redoute CatalogueMethod of packing collected objects and packing station therefor
US4796411 *May 6, 1987Jan 10, 1989Prima Meat Packers, Ltd. Research And Development CenterPackaging food in raised state
US5090180 *Dec 22, 1989Feb 25, 1992A/S Haustrup PlasticMethod and apparatus for producing sealed and filled containers
US5428943 *Sep 30, 1991Jul 4, 1995Kal Kan Foods, Inc.Method of filling and sealing a deformable container
US5555705 *May 11, 1995Sep 17, 1996Kal Kan Foods, Inc.Method of filling and sealing a deformable container
US5802816 *Jul 6, 1995Sep 8, 1998Raytest Isotopenmessgeraete GmbhProcess for the production of a specimen carrier
US20100107568 *Apr 18, 2007May 6, 2010Toyo Seikan Kaisha Ltd.Method and apparatus for heat-sealing container
WO1990002687A1 *Sep 13, 1989Mar 22, 1990Kal Kan FoodsMethod of filling and sealing a deformable container
U.S. Classification53/433, 53/471, 53/453, 53/474
International ClassificationB65B11/50, B65B11/52
Cooperative ClassificationB65B11/52
European ClassificationB65B11/52