Abstract:
The air remaining within a headspace of a can filled with a liquid such as a carbonated drink, juice drink, tea drink, coffee drink or the like is replaced with one of steam, a mixture of steam and carbonic acid gas, a mixture of steam and nitrogen gas, and a mixture of carbonic acid gas and nitrogen gas. Therefore, the quality of filled liquid can be maintained, and deterioration of the working environment can be prevented by avoiding the spraying of carbonic acid in all directions at the workshop.

Description:
BACKGROUND OF THE INVENTION 
     This invention relates to an apparatus for replacing air within a headspace of a container when filling liquid therein, and more particularly to such an apparatus for replacing air within a headspace of a container filled with a liquid such as a carbonated drink, juice drink, tea drink, coffee drink or the like. 
     A conventional container filled with a liquid by a filling machine is transferred to a sealing machine that seals by means of a cap or the like, and during a period when the air in the container is replaced. 
     Concerning such conventional air replacing apparatus, carbonic acid gas is blown into the headspace of the can which is filled with a liquid. Therefore, the air replacing apparatus in the prior art can maintain the quality of a liquid such as carbonated drink, juice drink or the like, however, the working environment becomes worse due to the carbonic acid gas blowing in all directions at the workshop. 
     SUMMARY OF THE INVENTION 
     In view of the foregoing, it is an object of the present invention to provide an apparatus for replacing air within a headspace of a container which can maintain the quality of a liquid such as carbonated drink, juice drink or the like filled into a can. It is another object of the present invention to provide an apparatus for replacing air within a headspace of a container by being blown with either of steam, a mixture of steam and carbonic acid gas and a mixture of steam and nitrogen gas. It is still another object of the present invention to provide such an apparatus for replacing air within a headspace of a container which can prevent the worsening of the working environment due to the spraying of carbonic acid gas in all directions inside the working place. 
     The above and further objects and novel features of the invention will more fully appear from the following detailed description when the same is read in connection with the accompanying drawings. 
    
    
     It is to be expressly understood, however, that the drawings are for the purpose of illustration only and are not intended as a definition of the limits of the invention. 
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an explanatory view showing a first embodiment of the present invention; 
     FIG. 2 is a top view illustrating a state in which a mixture of steam and gas is blown showing the first embodiment of the present invention; 
     FIG. 3 is a sectional view taken along line of  3 — 3  in FIG. 2; 
     FIG. 4 is an explanatory view of supplying a mixture of steam and carbonic acid gas showing the first embodiment of the present invention; 
     FIG. 5 is an explanatory view of supplying a mixture of steam and nitrogen gas showing the first embodiment of the present invention; 
     FIG. 6 is an explanatory view of supplying steam only showing the first embodiment of the present invention; 
     FIG. 7 is an explanatory view showing a second embodiment of the present invention; 
     FIG. 8 is an explanatory view of supplying a mixture of steam and carbonic acid gas showing the second embodiment of the present invention; 
     FIG. 9 is an explanatory view of supplying a mixture of steam and nitrogen gas showing the second embodiment of the present invention; 
     FIG. 10 is an explanatory view of supplying a mixture of carbonic acid gas and nitrogen gas; 
     FIG. 11 is an explanatory view of supplying steam only showing the second embodiment of the present invention; 
     FIG. 12 is an explanatory view showing a third embodiment of the present invention; 
     FIG. 13 is an explanatory view showing a fourth embodiment of the present invention; and 
     FIG. 14 is an explanatory view showing a fifth embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Preferred embodiments of the present invention are described in more detail below with reference to the accompanying drawings. 
     An understanding of the present invention may be best gained by reference FIGS. 1 to  6 . FIGS. 1 to  6  illustrate an apparatus for replacing air within a headspace of a container of the first embodiment of the present invention. 
     Numeral  1  shows an apparatus for replacing air within a headspace  4  of a container defining a can  3  filled with a carbonated drink  2  by being blown with gases including a mixture of steam and carbonic acid gas or a mixture of steam and nitrogen gas into the headspace  4  of the can  3  to replace the air therein. 
     The apparatus  1  is composed of a boiler  5  generating steam, a supply path  12  of steam, a supply path  15  of gas and a supply path  21  of a mixture of gases. The steam supply path  12  includes a closure valve  6 , an electromagnetic valve  7 , a reducing valve  8 , a filter  9  and a control valve for steam flow  10 . The steam generated by the boiler  5  is admitted through the steam supply path  12  to a mixer  11 . The gas supply path  15  allows gas to flow from either of a carbonic acid gas reservoir  13  defining a gas cylinder, tank or the like and a nitrogen gas reservoir  14  defining, the gas cylinder, tank or the like to the mixer  11 . The mixed gas supply path  21  includes a thermometer  19  and a pressure gauge  20 . A mixed gas mixed into the mixer  11  is admitted through a thermometer  19  and the pressure gauge  20  to a nozzle  18 . The mixed gas  16  is blown into the headspace  4  of the can  3  filled with a liquid defining a carbonated drink  2  by the nozzle  18 . 
     The gas supply path  15  further includes a supply path  28  of carbonic acid gas and a supply path  33  of nitrogen gas. The supply path  28  introduces carbonic acid gas and includes a closure valve  22 , a filter  23 , a mass-flowmeter  24 , an electromagnetic valve  25 , a reducing valve  26  and a control valve  27  for gas-flow. The carbonic acid gas provided from the carbonic acid gas reservoir  13  is admitted through the carbonic acid gas supply path  28  to the mixer  11 . 
     The supply path  33  introduces nitrogen gas includes a closure valve  29 , a filter  30 , a mass-flowmeter  31  and an electromagnetic valve  32 . A bottom end of supply path  33  is connected to a portion located between the electromagnetic valve  25  and the reducing valve  26  of the supply path  28 . The nitrogen gas provided from the nitrogen gas reservoir  14  is admitted through the supply path  33  to the supply path  28 . 
     In accordance with the above-mentioned invention, at first, when the mixture of steam and carbonic acid gas is blown into the headspace  4  of the can  3  filled with the carbonated drink  2 , as shown in FIG. 4, the steam is supplied into the mixer  11  by opening the closure valve  6  and electromagnetic valve  7  of the steam supply path  12 . Likewise, the carbonic acid gas is supplied into the mixer  11  by opening the closure valve  22  and electromagnetic valve  25  of the carbonic acid gas supply path  28  of the gas supply path  15 . A mixture of steam and carbonic acid gas defining an inert gas is blown out of the nozzle  18 , and the mixture gas has been blown into the headspace  4  of the can  3 . 
     When the mixture of steam and nitrogen gas is blown into the headspace  4  of the can  3 , as shown in FIG. 5, the steam is supplied into the mixer  11  by opening the closure valve  6  and electromagnetic valve  7  of the steam supply path  12 . Likewise, the nitrogen gas is supplied into the mixer  11  by opening the closure valve  29  and electromagnetic valve  32  of the gas supply path  15 . A mixture of steam and nitrogen gas defining an inert gas is blown out of the nozzle  18 , and the mixed gas has been blown into the headspace  4  of the can  3 . 
     Moreover, when the steam is blown singly into the headspace  4  of the can  3  only, the steam is blown into the mixer  11  by opening the closure valve  6  and electromagnetic valve  7  of the steam supply path  12  as shown in FIG.  6 . The steam gas defining an inert gas is blown out of the nozzle  18 , and the steam gas has been blown into the headspace  4  of the can  3 . 
     Other embodiments of the present invention will now be described referring to FIGS. 7 to  14 . 
     A second embodiment of the present invention is shown in FIGS. 7 thru  11 . It is distinguished from the first embodiment by the fact that the bottom end of the nitrogen gas supply path  33  is connected to a portion located between the electromagnetic valve  7  and the reducing valve  8  of the supply path  12 . In an apparatus  1 A for replacing air within the headspace  4  of the can  3  filled with the carbonated drink  2  formed in this way according to the second embodiment, the mixture of steam and carbonic acid gas, the mixture of nitrogen gas and steam, the mixture of carbonic acid gas and nitrogen gas or steam only can be blown selectively into the headspace  4  of the can  3  filled with the carbonated drink  2 . Therefore, the apparatus can replace air within the headspace  4  of the can  3  filled with the carbonated drink  2 . 
     A third embodiment of the present invention is shown in FIG.  12 . It is distinguished from the second embodiment by the fact that the carbonic acid gas reservoir  13  is replaced with the nitrogen gas reservoir  14 , and the nitrogen gas reservoir  14  is replaced with the carbonic acid gas reservoir  13 . An apparatus  1 B for replacing air within the headspace  4  of the can  3  filled with the carbonated drink  2  formed in this way according to the second embodiment will provide the same effects as the second embodiment. 
     A fourth embodiment of the present invention is shown in FIG.  13 . It is distinguished from the first embodiment by the fact that the steam gas is supplied through the thermometer  19  and the pressure gauge  20  into the nozzle  18 . In an apparatus  1 C for replacing air within the headspace  4  of the can  3  filled with the carbonated drink  2  formed in this way according to the fourth embodiment, the air remaining within the headspace  4  of the can  3  can be replaced surely by steam. 
     A fifth embodiment of the present invention is shown in FIG.  14 . It is distinguished from the first embodiment by the fact that the nitrogen gas supply path  33  is replaced from another nitrogen gas supply path  33 A. The supply path  33 A includes the closure valve  29 , filter  30 , mass-flowmeter  31 , electromagnetic valve  32 , reducing valve  26 A and control valve  27 A. The nitrogen gas provided from the nitrogen gas reservoir  14  is admitted through the supply path  33 A to the mixer  11 . In an apparatus  1 D for replacing air within the headspace  4  of the can  3  filed with the carbonated drink  2  formed in this way according to the first embodiment, the air remaining within the headspace  4  of the can  3  can be replaced surely by steam, the mixture of steam and carbonic acid gas, the mixture of nitrogen gas and steam or the mixture of carbonic acid gas and nitrogen gas. 
     Moreover, concerning each of embodiments of the present invention, the apparatus can be used for a can filled with not only a carbonated drink but also juice drink, tea drink, coffee drink or the like. 
     The present invention as set forth above, has the advantages described below. 
     (1) An apparatus for replacing air within a headspace of a container comprises a boiler and a supply path of steam for introducing the steam to a nozzle through a steam regulator valve, a nozzle blowing gas into the headspace of the container filled with a liquid, located at a seaming device of a container filling apparatus, so that a mixture of steam and carbonic acid gas or a mixture of steam and nitrogen gas defining an inert gas is blown into the headspace  4  of the can  3  filled with a liquid. The air remaining within the headspace  4  of the can  3  filled with a liquid for drinking can be surely replaced by the inert gas. 
     Therefore, the quantity of the inert gas such as carbonic acid gas used can be reduced as compared with that of only carbonic acid gas in the prior art. 
     Moreover, it can prevent the working environment from becoming worse. 
     (2) As discussed above, the air remaining within the headspace of the can defining a container can be replaced surely by a mixture of steam and carbonic acid gas. Therefore, the quality of filled drink can be maintained as before. 
     (3) As discussed above, a mixture of steam and carbonic acid gas or nitrogen gas is blown into the headspace by the nozzle. Therefore, replacing operations can be done easily and efficiently. 
     An apparatus for replacing air within a headspace of a can filled with a carbonated drink includes a boiler; a supply path of steam admitting steam generated by the boiler through a control valve for steam-flow into a mixer; a supply path of gas admitting gases provided from either of a carbonic acid gas reservoir and a nitrogen gas reservoir through a control valve for gas-flow into the mixer; and a supply path of a mixture of gases admitting a mixture of gases supplied into the mixer into a nozzle which blows the mixture into the headspace of the can filled with the carbonated drink. 
     An apparatus for replacing air within a headspace of a can filled with a carbonated drink includes a boiler; a supply path of steam admitting steam generated by the boiler through a control valve for steam-flow into a mixer; a supply path of gas admitting gases provided from either of a carbonic acid gas reservoir and a nitrogen gas reservoir to the steam supply path as occasion demands; a second supply path of gas admitting gases provided from either of a carbonic acid gas reservoir or a nitrogen gas reservoir through a control valve for gas-flow into a mixer; and a supply path of a mixture of gases admitting a mixture of gases supplied into the mixer into a nozzle which blows the mixture into the headspace of the can filled with the carbonated drink. Optionally, the nozzle is located at a seaming device of a container filling apparatus.