Patent Publication Number: US-5022564-A

Title: Regulated pressurized dispenser and method

Description:
This is a continuation-in-part of U.S. patent application Ser. No. 07/021/617, filed Mar. 2, 1987, now U.S. Pat. No. 4,909,420 and entitled &#34;REGULATED PRESSURIZED DISPENSER AND METHOD&#34;, which has been allowed, which in turn is continuation-in-part of U.S. patent application Ser. No. 671,048, filed Nov. 13, 1984, now U.S. Pat. No. 4,646,946 which is a continuation-in-part of U.S. patent application Ser. No. 413,498 filed Sept. 2, 1982, now abandoned. 
    
    
     BACKGROUND OF THE INVENTION 
     For a long time there has been a need for a self regulated pressure generating system for use in a container dispensing a product that is isolated from, and is not dispensed with, the product. Environmental considerations and safety precautions, as well as physical or chemical incompatabilities, toxicity, and contamination are some of the factors which emphasized this need. 
     Most other aerosol type dispensers generally were operable only in an upright position, otherwise premature exhaustion of the dispensing medium would result with a substantial loss of usable product which would remain indispensable in the container due to loss of dispensing pressure. 
     Dispensers pressurized with propellants have other deficiencies such as incompatibilities, non-uniform dispensing pressure, temperature sensitivity, leakage and unreliability and solubility problems. 
     The present invention provides a dispensing mechanism which overcomes the above-mentioned deficiencies of the prior art devices and provides additional novel features and advantages, and a wider range of uses, than were possible with devices used heretofore. 
     BRIEF SUMMARY OF THE INVENTION 
     Expulsion means for developing and substantially maintaining within predetermined maximum and minimum range gaseous dispensing pressure in a container from which a product is to be dispensed, comprising an enclosed fluid impermeable flexible pouch disposed within the container and having a pair of facing wall members. A plurality of pocket members in spaced relation to one another, each contains a predetermined quantity of first component of a two component gas generation mixture, and a closure member releasably closes each of said pocket members. This plurality of closed pocket members is disposed within the pouch, and each has a pocket extension member and a closure extension member affixed by weld portions to a predetermined spot on the interior of one of the facing wall members of the pouch. The first component of the two-component gas generation mixture is e.g. citric acid. The second component of said two-component gas generation mixture is e.g. sodium bicarbonate and water is disposed within the pouch and externally of said closed pocket members. When these two components are mixed, they react and generate carbon dioxide gas. Starting delay means, e.g., a rupturable or dissolvable capsule containing a predetermined quantity of the first component, e.g. citric acid, is disposed within the pouch in contact with the second component for causing the initial generation of carbon dioxide gas after a prescribed period of time. As the product is discharged intermittantly from the container, the pouch inflates and gradually expands in increments and displaces the product evacuated from the container. Each pocket member sequentially separates from its respective closure member as the pouch expands within the container to thereby open and empty its content into admixture with the second component to react and generate an additional predetermined quantity of pressurizing carbon dioxide gas within pouch (27). 
     One object of the present invention is to provide a dispensing mechanism to fill in the need of providing consumer products pressurized under maximum and minimum pressure levels. 
     Another object of this invention is to provide dispensing mechanism to fill the void where there is no suitable propellant for specific products required to be dispensed under specific pressure levels. 
     Another object of this invention is to provide a safe and efficient pressurized system which conforms with the laws and regulations of various government agencies. 
     Other objects of the precise nature of the present invention will become evident from the following description and accompanying drawings in which each of the various components has the same reference numeral in their different views. 
    
    
     DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an elevation sectional view of an aerosol dispensing container including an expulsion means embodiment of the present invention shown in a fragmentary cutaway view; 
     FIG. 2 is a sectional plan view of the structure shown in FIG. 1 showing the expulsion means in initial collapsed condition. 
     FIG. 3 is a sectional plan view of the structure shown in FIG. 1, showing the expulsion means in intermediate expanded condition; 
     FIG. 4 is an enlarged isometric view of the two envelope sheets of an embodiment of the invention prior to assembly; 
     FIG. 5 is an enlarged isometric view of the two envelope sheets of FIG. 4 in assembled condition; 
     FIG. 6 is a sectional view taken along lines 6--6 of FIG. 5; 
     FIG. 7 is an enlarged schematic representation showing, the method of insertion of the envelope into the pouch; 
     FIG. 8 is an enlarged schematic representation, showing heat sealing of the envelope sides to the inner walls of the pouch; 
     FIGS. 9 through 11 are reduced sectional elevations showing assembly of the pouch containing the envelope inside an aerosol type dispenser; 
     FIGS. 12 and 13 are enlarged fragmentary schematic views showing separation of the envelope sides during expansion of the pouch to open the pocket members; 
     FIG. 14 is another cross section view of the structure shown in FIG. 1, showing the expulsion means in initial collapsed condition. 
     FIG. 15 is another sectional plan view of the device shown in FIG. 1, showing the expulsion means in intermediate expanded condition. Also shown are the exterior surfaces of the extensions of the pocket and closure members attached to the interior of the facing walls of the pouch. 
     FIG. 16 is a schematic representation of an arrangement of the closure members and the pattern of attachment of the exterior sides of their extensions to the interior of the facing wall of the pouch. 
     FIG. 17 is a schematic representation of the arrangement of a plurality of envelopes, independent from each other disposed within the pouch and each having a single pocket member. 
    
    
     DETAILED DESCRIPTION 
     Referring to the drawings, in which each of the various components has the same reference numeral in the different views, and in particular FIGS. 1-3, a fluid impermeable dispensing container is shown and designated generally by reference (10). Container (10) has a cylindrical body or side wall (11), inwardly dished bottom (12) and bell-shaped top (13) in which is mounted a conventional spring valve assembly (14). Container (10) and its component parts just described can be fabricated from any suitable material such as thin gauge aluminum or other metal, or even plastics, depending on the product to be dispensed and any governing safety specifications that might be involved. Valve assembly (14) is also of conventional design having plunger and spray head (15) carrying spray orifice 16, suitably constructed of plastic material, and internal parts (not shown) such as spring, ball valve and mounting ring (17) and bottom intake member (18) which may be of metal and/or plastic consistent with the previously mentioned requirements. 
     Within container (10) is flowable product (19) and expulsion assembly (20) which is the subject of the present invention and as will be seen, generates and maintains gas pressure therein to enable product (19) to be dispensed on demand, substantially under a range of predetermined maximum and minimum pressure levels. 
     At the upper end (21) of the interior of cylindrical body (11) is a perforated or foraminous barrier member (22) having a plurality of holes (23) distributed throughout its surface. Also located along inner surface (24) of sidewall (11) and extending longitudinally there along is a perforate tube member (25) having a plurality of holes (26) at spaced positions around and along said tube member (25). The function of barrier member (22) and tube member (25) is to insure trouble-free operation of the dispenser and prevent expulsion assembly (20), as it expands in the manner to be described, from blocking off or plugging the interior of the container either laterally/circumferentially or plugging off valve bottom intake member (18). 
     Expulsion assembly as shown is disposed within container (10) without being attached or anchored to container (10), although it may, if desired be so connected. Assembly (20) is comprised of generally regular envelope, bag or pouch (27) which is constructed of a flexible, fluid impermeable plastic material, such as, for example, polyethylene or polypropylene and may be fabricated from a sheet of plastic by folding it into overlaid halves (27a), (27b) which are then sealed or adhered by suitable means along their respective contacting side, bottom and top edges (28), (29), (30) respectively to form sealed enclosure as shown in FIG. (1) to (3) inclusive. 
     Disposed within pouch (27) is fluid impermeable flexible plastic sandwich or enfoldment (31), having a pair of facing wall members (32) and (33) releasably adhered to one another--(see also FIGS. (2) through (6)--and permanently attached on their exterior surfaces by suitable means, such as heat sealed portions (35) to respective interior sides (27c) and (27d) respectively. Portions of one wall member (33) have plurality of cup-shaped depressions, cavities or pocket members (34) disposed inwardly from one surface thereof at spaced positions, and other portions of wall member (33), each forms an extension member (a) as in FIG. (15), to each pocket member. Each extension member extends from the edge of the opening of its respective pocket member to the edge of wall member (33). Each extension ends at a predetermined distance from the edge of the opening of its pocket member. Each extension is affixed permanently at its end by one of weld portions (35) to predetermined locations or spots on the interior wall (27d). These spots on interior wall (27d) are located on the same locations as weld portions (35) shown in the drawing and are superimposed and concealed by them. They may be referred to in the drawings by the same numeral (35). The other wall member (32) is substantially flat and has lidding area members or closure members which close each of the respective facing member of pockets (34) and releasably adhered to it. Pocket members (34) are superimposed on these closure members in the drawings, see FIG. (17). Other areas of wall member (32), each forms an extension member (b) as in FIG. (15), to each closure member. Each closure extension member extends from the edge of each of closure member to the edge of wall member (32). Each extension ends at a predetermined distance from the edge of its closure member. Each extension is affixed permanently at its end by one of weld portions (35) to a predetermined location or spot on interior wall (27c). These spots on interior wall (27c) are on the same locations and are superimposed by weld portions (35) in the drawings. They may be referred to in the drawing by the same numeral (35). Each of pocket members (34) is releasably closed by wall member (32) to encapsulate within each of pocket members (34) a predetermined quantity of aliquot of component (36), which may be either in the form of powder or a solution. Disposed within pouch (27) is component (37) including a solvent. Also disposed within pouch (27) and mixed with component (37) is starting delay means or device (38), which as shown is in the form of dissovable capsule and contains an initial charge of component (36). Pouch (27) is then closed by sealing its open end. After the elapse of a predetermined period of time after assembling expulsion assembly (20) and disposing it within container (10), filling product (19) therein, and placing tubing (25) and barrier (22) in place and capping container (10) with top (13) and its associated parts, capsule (38) dissolves and causes component (36) contained therein to be exposed and to mix and react with component (37) and generate the initial quantity of pressurizing gas, thereby inflating and expanding bag or pouch (27) and providing dispensing pressure within container (10). The solvent portion of component (37) which is in a liquid state during the useful life of the dispenser may be added in a liquid state or in a frozen state during manufacturing. 
     It is to be understood that cavities or pocket members (34) and capsule (38) may carry component (36), e.g. citric acid in powder form or in solution, and component (37) may be sodium bicarbonate and water, or the two carbon dioxide gas generating components can be switched the other way around. 
     Pouch (27), in one preferred embodiment, is constructed of a three layer laminated film having a middle layer of saran, an external layer of Mylar about 0.5 mils thick, and the inside layer (the interior of the pouch) being low density polyethylene of about 1.5 mils thick, and the saran layer is only deposited from spray. The characteristics required or desired in said pouch is that it be non-toxic, has sufficient mechanical strength and chemical stability, and flexible but not appreciably stretchable, and the interior facing surfaces of the pouch be heat sealable. Pouch (27) can also be constructed from other films such as impervious or non-impervious, non-laminated or laminated with plastics, foil or treated fabrics or other suitable material which may be available. 
     Wall member (32) is fabricated from the same material which contacts the interior of pouch (27) and is of compatible plastic material, e.g. low density polyethylene. In one preferred embodiment, it has an overall thickness of about 4.5 mils and is a three layer sandwich of about 0.5 mils mylar in the middle and about 2.0 mils of low density polyethylene on either sides. Wall member (32) may also be constructed from other films such as impervious or non-impervious, coated or non-coated, laminated with plastics, foil or treated fabrics or any other suitable material which may be available. 
     Wall member (33), carrying the cup-shaped depressions or pocket members (34), adapted for deep drawing and is in one preferred embodiment a laminated plastic sheet having an exterior layer--(the layer in contact with the interior of pouch (27)--of low density polyethylene of about 0.5 mils to about 20 mils thick and an interior layer (the other side) of polypropylene of from about 0.1 mils to about 3.75 mils thick or higher. Wall member (33) may also be constructed from any other suitable material. 
     While for most practical applications of the invention, components (36) and (37) as citric acid and sodium bicarbonate mixed with water respectively are normally preferred, it is possible that under particular circumstances other materials may be suitable such as, for example, dilute hydrochloric acid (e.g. 10 to 30%) may replace citric acid, and lithium carbonate or calcium carbonate may replace the sodium bicarbonate. It is to be understood that component (36) may be selected from any suitable material which can react with component (37) and generate a pressurizing gas, and the contents of each of pocket members (34) and capsule (38) may be the same material or different from each other. 
     The radio-activity at the surface of the dispenser and its component parts and accessories as well as that of the product discharged therefrom is within human tolerance, and does not exceed 0.1 milliroentgen per hour at the time of manufacturing. This requirement may be obtained by blending materials of lower level radio-activity than the level required with materials of higher level radio-activity than the level required in order to produce blended materials of the required low level radio-activity. 
     Capsule (38), which functions as the starting delay means or device, may be constructed from any suitable material, such as gelatin, or coating such as shellac, or any breachable or breakable barrier enclosure. 
     The method of assembly requires the following data to be determined: 
     1. The Maximum and minimum pressure levels under which product (19) is to be discharged out of container (10). 
     2. The increases in the size of pouch (27) within container (10) at the time when its internal pressure drops sequentially from predetermined maximum to predetermined minimum pressure levels. 
     3. The number of the releasably closed pocket members (34) required to be disposed within pouch (27) and the order of their sequential opening within pouch (27) as the product is dispensed from container (10), the quantities of component (36) to be enclosed in each of these releasably closed pocket members (34) as well as in capsule (38), the quantity of component (37) including the solvent e.g., water in this case, to be deposited within pouch (27), and the lengths of each of the pocket and closure extension members of each of said closed pocket members according to the order of their sequential opening. 
     For all practical purposes, the internal pressure within pouch (27) or expulsion means (20) is presumed to be equivalent to the internal pressure of container (10). 
     As capsule (38) disintegrates, its content of component (36) is released and reacts with second component (37) within pouch (27), and generates the initial predetermined quantity of pressure generating gas which raises the internal pressure therein to the predetermined maximum pressure level, and pouch (27) inflates and expands within container (10). 
     As product (19) is dispensed, and thereby pouch (27) expands and increases in size further and displaces the space vacated by product (19) within container (10), each quantity of component (36) encapsulated in each of closed pocket members (34) is released sequentially and reacts with component (37) within pouch (27) and generates sequentially additional predetermined quantities of pressurizing gas therein each time the internal pressure within pouch (27) drops from predetermined maximum pressure level to predetermined minimum pressure level. These additional quantities of pressurizing gas raise the internal pressure within pouch (27) from predetermined minimum pressure levels to predetermined maximum pressure levels. The increases in the size of pouch (27) cause its facing walls to push outwardly, and thereby the distance between interior wall members (27c) and (27d) as well as the distances between identifiable spots on these two walls increase. Eventually the pocket members of each of closed pocket members (34) separate from their respective closure members and said closed pocket members open sequentially and discharge their contents, which react with component (37) and generate sequentially additional predetermined quantities of pressurizing gas, which raise the pressure therein to predetermined maximum levels. The internal pressure within pouch (27) alternates between predetermined maximum and minimum pressure levels, until dispensing product (19) is completed. 
     The method of assembly is depicted schematically in FIGS. (4) to (8) and (9) to (11). By heating and drawing portions of sheet (33) in a mold, cavities or pockets are formed on portions of sheet (33), and extension members to each of pockets (34) are formed on other portions of sheet (33). Each of these extensions extends from the edge of the opening of each member of pockets (34) and ends at the edge of sheet (33). Each extension ends at a predetermined distance from the edge of the opening of its pocket member. Predetermined quantities of component (36) e.g. citric acid are deposited in each member of pockets (34). Each of these quantities and the length of the extension of each pocket member are predetermined according to the order of the sequential opening of each closed pocket member in the manner to be described. Then sheet (32) is overlayed on sheet (33) and they are releasably sealed together (FIG. 5) to close each of pockets (34), and thereby form enfoldment (31). Portions of sheet (32) become liddings or closures to each member of pockets (34). Other portions of sheet (32) become extensions to each of these closure members. Each extension member extends from the edge of each closure member to the edge of wall member (32). Each extension ends at a predetermined distance from the edge of its closure member. The length of the extension of each closure is predetermined according to the order of the sequential opening in the manner to be described. Enfoldment (31) is inserted into the open end (30) of pouch (27). The exterior walls of enfoldment (31) are heat sealed together permanently by weld portions (35) as follows: The end of each extension member of pocket members (34) is affixed permanently to predetermined identified location or spot on interior wall (27d) by one of weld portions (35), and the end of each extension member of the closure members is affixed permanently to predetermined identified location or spot on interior wall (27c) by one of weld portions (35), (FIG. 8). Capsule (38) and a predetermined quantity of component (37), which includes water which may be in a frozen state are deposited within pouch (27), and then upper edge (30) is closed and heat sealed permanently to completely enclose the contents in pouch (27) and thereby complete the assembly of expulsion means (20). This expulsion means assembly (20) is then inserted into container (10) and product (19) is added therein around it, barrier (22) and perforated tubing (25) are put into place, and top (13) is affixed to container (10) (FIG. 10). After elapse of a prescribed period of time, the the frozen ingredient in component (37) melts, and capsule (38) has dissolved and generates a predetermined quantity of pressurizing gas, e.g. carbon dioxide gas, which inflates, pressurizes and causes pouch (27) to expand, and the dispenser is now ready for use (FIG. 11). FIGS. (3), (12), and (13) show schematically how interior walls (27c) and (27d) of pouch (27) are permanently affixed and welded at weld portions (35) to the exterior of wall members (32) and (33), and how the expansion of pouch (27) causes the closure members to separate from their respective pocket members and open and expose their content of first component (36) to admix and react with the second component (37) and water within pouch (27) and thereby generate additional predetermined quantities of the pressurizing gas. 
     Enfoldment (31) may also be sliced in suitable patterns to form smaller units of enfoldment (31), each comprised of a single closed pocket member (34) encapsulating a predetermined quantity of component (36). Each pocket and its closure has an extension extending to the edges of sheet (33) and (32) respectively as described above. Each of single closed pocket members (34) may be disposed within pouch (27) unattached to the other closed pocket members. Each extension of pocket members (34) ends at a predetermined distance from the edge of the opening of its respective pocket member, and each extension of the closure members ends at a predetermined distance from the edge of its respective closure member. Each of these ends defines a free end of their respective extensions. 
     The delay device may be constructed from gelatinous material in the form of a gelatinous capsule or a pouch which disintegrates in its surrounding within the expulsion assembly, and it may also be a container or an enclosure constructed from glass or any other suitable material, which is broken open within the expulsion assembly at any time before or after assembling the dispenser, whichever situation is suitable in the manufacturing process. 
     The second component of the two-component gas generation system (37) may include an ingredient in a frozen state at the time when it is deposited within pouch (27) and subsequently it liquifies. 
     In a dispenser of the following description, the method of determination of, 
     a. the increases in the pouch size each time the pressure therein drops from the predetermined maximum to the predetermined minimum pressure levels, 
     b. the number of closed pocket members (34) to be disposed within pouch (27), 
     c. the quantity of first component (36) e.g. citric acid to be encapsulated in each of closed pocket members (34) and capsule (38), 
     d. the length of each extension of the pocket and the closure members of each of closed pockets (34), 
     e. the quantity of second component (37) e.g. sodium bicarbonate and solvent, e.g. water, to be introduced into pouch (27). 
     The above mentioned items may be determined as follows: 
     It is assumed that expulsion assembly (20) comprising a bag or pouch (27) enclosing: a gelatin capsule (38) encapsulating a predetermined quantity of citric acid, and a predetermined quantity of sodium bicarbonate and 5 cc of water, and an insignificant quantity of atmospheric air, and having displacement capacity of 12 cc, is disposed within container (10) having displacement capacity of 140 cc. One hundred (100) cc of flowable product (19) is introduced into container (10) around expulsion means (20), and barrier member (22) and perforated tubing (25) are put in place, and top (13) is affixed on container (10) to close it. The aggregate head space above the liquid in container (10) and in expulsion assembly (20) is 28 cc, occupied by atmospheric air. The pressure under which product (19) is to be discharged from container (10) should be within the range of maximum pressure level of 144 psig. and minimum pressure level of 100 psig. 
     It is assumed that one atmospheric pressure at normal temperature measures 14.4 psig., and 144 psig, is equivalent to ten (10) atmospheric pressures. 
     It is assumed that the complete reaction of 1.45 gms. of citric acid with 1.9 gms. of sodium bicarbonate in aqueous medium generates 1 gm. of carbon dioxide gas, and that 1000 cc of carbon dioxide gas weigh 1.82 gms., and that 1 gm. of carbon dioxide gas measures 549.45 cc at normal temperature and pressure. 
     It is assumed that 0.02639 gms. of citric acid is required to completely react with enough quantity of sodium bicarbonate in aqueous medium in order to generate 1 cc of carbon dioxide gas compressed under 144 psig. (pound per square inch gauge), and 0.03458 gms. of sodium bicarbonate is required to completely react with enough quantity of citric acid in aqueous medium in order to generate 1 cc of carbon dioxide gas compressed under 144 psig. 
     The air in the 28 cc of head space in this dispenser pressurized under 14.4 psig., that is the number of molecules contained therein, provides a quantity of pressurized gas under 144 psig. for only 2.8 cc. 
     After the completion of discharging its contents of product (19), this dispenser will be capable of holding gas pressurized under 144 psig., the volume of which is calculated as follows: 
     
         100+28-2.8=125.2 cc. 
    
     The quantity of sodium bicarbonate required to react with enough quantity of citric acid to generate carbon dioxide gas compressed under 144 psig. in a space of 125.2 cc is calculated according to the above mentioned mathematical formula as follows: 
     
         125.2×0.03458=4.32 gms., 
    
     rounded to 4.4 gms. of sodium bicarbonate. (It is permitted to exceed the calculated quantity of component (37), which may help the chemical reaction.) 
     Following are the stages of the internal pressure in pouch (27) and the incremental expansion in the size of pouch (27) in the course of discharging product (19) out of container (10) from beginning to end: 
     Under normal conditions, immediately after the dispenser is assembled and before the generation of the pressurizing gas begins therein, the internal pressure within the 28 cc of head space in container (10) should measure one atmospheric pressure or 14.4 psig. An additional quantity of pressurizing gas is required to provide another 25.2 cc of pressurizing gas compressed under 144 psig. for raising the pressure in the total head space of 28 cc within container (10) to 144 psig. This 25.2 cc is the difference between 28 cc and 2.8 cc. This additional quantity of pressurizing gas is generated by reacting an additional quantity of citric acid with the sodium bicarbonate within pouch (27), which is calculated according to the above mentioned mathematical formula as follows: 
     
         25.2×0.02639=0.665 gms. citric acid. 
    
     This quantity of citric acid is encapsulated in capsule (38), which is deposited within pouch (27) together with the sodium bicarbonate and water, which may be in a frozen state. After a predetermined period of time, this capsule disintegrates or dissolves and releases its content within pouch (27). Its 0.665 gms. content of citric acid reacts with the sodium bicarbonate within pouch (27) and generates the required quantity of additional pressurizing gas which raises the pressure within this space of 28 cc to 144 psig. 
     Product (19) is discharged from container (10) at staggered intervals in small increments. Pouch (27) gradually expands therein and increases in size. When its internal pressure drops from 144 psig. to 100 psig. for the first time, the size of pouch (27) should expand to the size which is calculated as follows: 
     
         (28×144) divided by 100=40.32 cc., 
    
     that is an increase of 12.32 cc. 
     This additional 12.32 cc requires an additional quantity of pressurizing gas which can be generated by reacting the following quantity of citric acid with the sodium bicarbonate within pouch (27) in order to raise the internal pressure within this dispenser to 144 psig. from 100 psig., which is calculated as follows: 
     
         12.32×0.02639=0.325 gms. citric acid. 
    
     This quantity of 0.325 gms. of citric acid is encapsulated in one of closed pocket members (34) which is disposed within pouch (27) and is scheduled to open first among the plurality of closed pocket members (34) which are scheduled to open within pouch (27). 
     By the same method of the calculation mentioned above, after the internal pressure within pouch (27) drops from 144 psig. to 100 psig. twice, its size increases further as follows: 
     
         40.32×1.44=58.06 cc, 
    
     that is an increase of 17.74 cc. 
     The closed pocket member disposed within pouch (27) and scheduled to open second in sequence, should encapsulate the following quantity of citric acid in order to raise the pressure within this dispenser to 144 psig. from 100 psig., which is calculated as follows: 
     
         17.74×0.02639=0.468 gms. citric acid. 
    
     After the internal pressure within this dispenser drops from 144 psig. to 100 psig. three (3) times, the size of pouch (27) increases as follows: 
     
         58.06×1.44=83.6 cc, 
    
     that is an increase of 25.546 cc. 
     The closed pocket member disposed within pouch (27) and scheduled to open third in sequence should encapsulate the following quantity of citric acid in order to raise the internal pressure within this dispenser to 144 psig. from 100 psig., which is calculated as follows: 
     
         25.546×0.02639=0.674 gms. 
    
     After the internal pressure within this dispenser drops from 144 psig. to 100 psig. four (4) times, the size of pouch (27) increases as follows: 
     
         83.6×1.44=120.384 cc, 
    
     that is an increase of 36.784 cc. 
     The closed pocket member disposed within pouch (27) and scheduled to open fourth in sequence, should encapsulate the following quantity of citric acid in order to raise the pressure within this dispenser to 144 psig. from 100 psig., which is calculated as follows: 
     
         36.784×0.02639=0.97 gms. of citric acid. 
    
     However, there is only 128 cc of space available within container (10), and pouch (27) can expand additionally only another 7.616 cc, which is the difference between 128 and 120.384 cc. Consequently, the internal pressure within this dispenser cannot drop to 100 psig. when dispensing product (19) from this dispenser is completed. On the other hand, in order to have the internal pressure within this dispenser drops to a minimum of 100 psig. at the time when dispensing product (19) from this dispenser is completed, this closed pocket member which is scheduled to open fourth in sequence must encapsulate the following minimum quantity of citric acid, which is calculated as follows: 
     
         7.616×0.02639=0.2 gms. citric acid. 
    
     Accordingly, any quantity of citric acid ranging between 0.2 gms. and 0.97 gms. encapsulated within this closed pocket member which is disposed within pouch (27) and is scheduled to open fourth in sequence, will provide pressure within the range between 100 psig. and 144 psig. at the time when discharging product (19) from this dispenser is completed, and thus conform with the requirements specified for this dispenser. 
     The four (4) closed pocket members mentioned above are required to be disposed within pouch (27) according to the order of their sequential opening. 
     Items (a), (b), (c), and (e) have been determined as mentioned above. Item (d) may be determined as follows: 
     The length of the extension of the pocket member and the length of the extension of its respective closure member of each of closed pocket members (34) may be determined as follows: 
     I. An experimental pouch (27) made of transparent plastic material having two (2) facing walls (27a) and (27b). Walls (27a) and (27b) having interior walls (27c) and (27d) respectively. Each of interior walls (27c) and (27d) is marked at random with four identifiable markings or spots at suitably accessible locations forming four identifiable pairs of spots, each comprising two (2) member spots, one member spot of which is suitably located on interior wall (27c) and the other member spot is suitably located on interior wall (27d). 
     II. An experimental container (10) having the shape and dimensions of the container intended to be utilized in the mass production of the dispenser, and is constructed from any suitable metal or transparent material. 
     III. An experimental expulsion assembly (20) comprising pouch (27) described in step I, in which are deposited capsule (38) encapsulating 0.665 gms. of component (36) e.g., citric acid, and 4.4 gms. of component (37) e.g., sodium bicarbonate including 5 cc of water, in contact with each other. Then pouch (27) is closed by sealing its open end, top side (30). 
     IV. An experimental apparatus is assembled by disposing experimental expulsion assembly (20) of step III within experimental container (10) of step II and adding therein around expulsion assembly (20) 100 cc of product (19). Perforate tubing (25) and barrier (22) are put in place, and top (13) is affixed to container (10). Container (10) is immersed in water heated to about 60 degrees Centigrade. After elapse of a period of time of about four (4) minutes, capsule (38) has disintegrated and components (36) and (37) mix and react and produce a predetermined quantity of carbon dioxide pressurizing gas, which raises the pressure within pouch (27) to 144 psig., and this pressurized apparatus is ready to be sprayed. 
     V. Product (19) is discharged from container (10) at intervals in small increments, and the internal pressure within container (10) is measured after each time product (19) is discharged. Container (10) is shaken periodically. Simultaneously when the internal pressure within this apparatus drops to 100 psig. for the first time, pouch (27) expands an additional 12.32 cc within container (10) and the distances between the member spots of the identifiable pairs of spots also increase. 
     VI. The image of the interior of experimental container (10) and that of the experimental expulsion assembly (20), and their component parts are reproduced by an imagery process or by photography or by any other suitable process at the time when the internal pressure in container (10) drops to 100 psig. for the first time. The distance between two members of an identifiable pair of spots which are suitably located on each of interior walls (27c) and (27d), is measured. 
     VII. Step IV is repeated using experimental container (10), experimental expulsion assembly (20) containing 4.4 gms. of sodium bicarbonate, 5 cc of water, capsule (38) encapsulating 0.665 gms. of citric acid, and adding the first closed pocket member encapsulating 0.325 gms. of citric acid disposed within pouch (27) as follows: the total length of its pocket extension member (a) plus the length of its closure extension member (b) is made equal to the distance between the two members of the pair of the identifiable spots measured in step IV, and the end of its pocket extension member (a) and the end of its closure extension member (b) are affixed by weld portions (35) to each member of the identifiable pair of spots on interior walls (27c) and (27d) identified in step VI. 
     VIII. Step V is repeated, allowing the internal pressure in container (10) to drop twice to 100 psig., and thereby pouch (27) has expanded an additional 17.68 cc. 
     IX. Step VI is repeated, and the distance between the two members of another identifiable pair of spots, one member spot on each of walls (27c) and (27d), is measured. 
     X. Step VII is repeated, and in addition the second closed pocket member encapsulating 0.47 gms. of citric acid is disposed within pouch (27) as follows: the total length of its pocket extension member (a) plus the length of its closure extension member (b) is made equal to the distance between the two members of the pair of the identifiable spots measured in step IX, and the end of its pocket extension member (a) and the end of its closure extension member (b) are affixed by weld portions (35) to each member of the identifiable pair of spots on interior walls (27c) and (27d) identified in step IX. 
     XI. Step VIII is repeated, allowing the internal pressure in container (10) to drop three times to 100 psig., and thereby pouch (27) has expanded an additional 25.52 cc. cc. 
     XII. Step IX is repeated and the distance between members of the third pair of identifiable spots, one member spot on each of walls (27c) and (27d), is measured. 
     XIII. Step X is repeated, and in addition, the third closed pocket member encapsulating 0.674 gms. of citric acid is disposed within pouch (27) as follows: the total length of its pocket extension member (a) plus the length of its closure extension member (b) is made equal to the distance between the two members of the pair of the identifiable spots measured in step XII, and the end of its pocket extension member (a) and the end of its closure extension member (b) are affixed by weld portions (35) to each member of the identifiable pair of spots on interior walls (27c) and (27d) identified in step XII. 
     XIV. Step XI is repeated, allowing the internal pressure within container (10) to drop four times to 100 psig., and thereby pouch (27) has expanded an additional 36.75 cc. 
     XV. Step XII is repeated and the distance between members of the fourth pair of identifiable spots, one member spot on each of walls (27c) and (27d), is measured. 
     XVI. Step XIII is repeated and in addition the fourth pocket member encapsulating 0.97 gms. of citric acid is disposed within pouch (27) as follows: the total length of its pocket extension member (a) plus the length of its closure extension member (b) is made equal to the distance between the two members of the pair of the identifiable spots measured in step XV, and the end of its pocket extension member (a) and the end of its closure extension member (b) are affixed by weld portions (35) to each member of the identifiable pair of spots on interior walls (27c) and (27d) identified in step XV. 
     For practical purposes, the internal pressure within pouch (27) is dealt with as synonymous to that of expulsion assembly means (20) and is equivalent to the internal pressure within container (10). 
     All quantities, pressures, volumes and measurements given above are in approximate numbers and are presumed to be substantially accurate. 
     The above is the data required to manufacture and assemble the above mentioned dispenser. In mass production, expulsion assembly (20) in step XVI is duplicated, and the dispenser is assembled and completed on the production line. By following the above mentioned method, dispensers of other specifications can be processed as well. 
     After dispensing the product from the container is completed, the pouch will line the interior of the container. 
     While certain illustrative embodiments of the invention have been described with particularity, it will be understood that various other modifications will be readily apparent to those skilled in the art without departing from the scope and spirit of the invention. Accordingly, it is not intended that the scope of the claims appended hereto be limited to the description set forth herein, but rather that the claims be construed as encompassing all equivalents of the present invention which are apparent to those skilled in the art to which the invention pertains.