Container cooler

Abstract: A container (21) is held between a conveyor (41) and guide means (25, 26) provided around the conveyor (41). The guide means (25, 26) come in frictional contact with the container (21) to rotate it around its own axis as the conveyor runs in its circumferential path. The conveyor (41) is partially water-immersed within a water tank (40), the water being cooled to cool the container (21). Whilst being rotated within the water tank (40), the container (21) may have ultrasonic waves applied to its side wall from ultrasonic vibrators (28) to flush the container (21). The conveyor may be provided on its outer peripheral surface with fin-like, vertically extending projections (20) circumferentially spaced from one another at regular intervals. Also upper rails (22), sloped rails (23) and lower rails (24) may be provided to support the bottom of the containers (21).

Description: This invention relates to an apparatus for cooling containers such as ampoules, vials and bottles. Figure 7 of the attached drawings shows a typical container cooler of prior art. At an inlet end of a conveyor 61, a container 62 to be cooled is fed and placed, in a standing posture, on the conveyor 61 which conveys, in turn, the container into a water tank 63. In the course of such conveyance, the container is cooled with water injected from above through a nozzle 64. Then the container 62 is transferred at an outlet end of the conveyor from the conveyor onto a carrying plate 65 which is coupled to an ultrasonic transducer 66 to achieve a mixing effect. Upon completion of cooling, the container 62 is transferred by a lift conveyor 67 onto a conveyor 68 serving to convey the container 62 to a subsequent process. However, the above-mentioned cooler of prior art has encountered various problems as will be described. The ultrasonic waves are applied to a predetermined number of containers which are moving randomly while conveyed in a group. Therefore, not only the time for which the ultrasonic waves are applied to individual containers is uneven but also the amount of the ultrasonic waves applied to the bottom wall of each individual container is uneven, resulting in uneven cooling. The carrying plate 65 interposed between the container 62 and the ultrasonic vibrator 66 inevitably attenuates the ultrasonic waves and reduces their mixing efficiency. Finally, the container 62 is applied with the ultrasonic waves from its bottom and consequently its lower portion is exposed to the ultrasonic waves more intensely than the upper portion of the container 62. Thus glass exfoliation due to the ultrasonic wave often occurs in the lower portion of the container. US-A-2494864 describes a cooler for cooling tin cans containing cooked food. This cooler comprises a conveyor for conveying the container in a tank in which the conveyor and the container conveyed by it is at least partially immersed in a coolant liquid and a cooling unit being provided within the tank, the cooling unit having an inlet and outlet for the coolant liquid. In the arrangement shown in this US specification the conveyor includes a number of freely rotatable rollers arranged with their axis generally horizontal, a driven belt to engage the freely rotatable rollers to rotate them and, in turn rotate the containers about their axes. According to this invention such a container cooler is characterised in that the conveyor comprises raising and lowering means and conveys the container in a generally upright orientation along the circumferential path into, along and out of the tank, and comprises guide means disposed outside the conveyor, the conveyor and the guide means being urged together to establish a frictional contact between the side wall of the container and the guide means to cause the container to rotate around its axis. EP-B-0536920 from which the present subject matter has been divided, discloses an improved cooler in which ultrasonic waves are applied to the sides of the containers as these are rotated. Particular embodiments of a cooler in accordance with this invention will now be described with reference to the accompanying drawings, in which:- Figure 1 is a plan view showing an embodiment of an ampoule cooler constructed according to the invention; Figure 2 is a side view showing the cooler partially in a section taken along a line VIII - VIII in Figure 1; Figure 3(a) is a side view showing a relationship of the upper rail 22, the sloped rail 23 and the lower rail 24; Figure 3(b) is a side view showing a relationship between the upper rail 22 and the lower rail 24 in an alternative embodiment with respect to the embodiment shown by Figure 3(a); Figure 4 is a plan view showing a relationship between the guide 25 and an inlet end 27 of the adjacent guide 26; Figure 5 is a plan view showing a manner in which the guide 26 is brought in a frictional contact with the side wall of the container; Figure 6 is a diagram showing the cooler of the invention arranged in association with relevant peripheral apparatuses; and, Figure 7 is a diagram schematically showing a flusher of prior art. Although the invention will be described first with respect to the ampoule as an example of the sealed container, it should be understood here that the invention is not limited to this and is applicable also to containers of other types such as vial, bottle and phial so far as they have substantially circular or elliptical cross-sections. Figure 1 is a plan view of the ampoule cooler and Figure 2 is a side view including a sectional view taken along a line VIII - VIII in Figure 1. Referring to these Figures, the cooler of the invention will be described in detail. A conveyor 41 of a relatively large width is draped around parts of respective timing pulleys 12, 13 within a water tank 40 and driven by the timing pulley 12 so as to be moved in a circumferential path counter clockwise (i.e., in the direction as indicated by an arrow in Figure 1). Referring to Figure 1, reference symbol (I) designates an inlet end and reference symbol (O) designates an outet end of the conveyor 11. As will be apparent from Figure 2, rotation of an electric motor 14 provided below the water tank 40 is transmitted via belts 15, 16 to an output shaft 17, on one side, and via a belt 18 to a drive shaft 19 of the timing pulley 12. The conveyor 41 is provided on the outer peripheral surface thereof with fin-like projections 20 extending vertically and laterally spaced from one another at regular intervals so that an ampoule 21 is held between each pair of adjacent projections 20 and the ampoule 21 is conveyed in the direction as indicated by the arrow in Figures 1 and 2 as the conveyor 41 runs in the circumferential path. Around the conveyor 41, there are provided upper rails 22, sloped rails 23 and lower rails 24 so that the ampoule 21 has its bottom supported by these rails 22, 23, 24, as the ampoule 21 is conveyed. Referring to Figure 3(a), the upper rails extend at a relatively high level so as to be associated with the upper portion of the conveyor 41 and thereby to support the ampoule 21 above the water surface 39 while the lower rails extend at a relatively low level so as to be associated with the lower portion of the conveyor 11 and thereby to support the ampoule 21 below the water surface 39. The sloped rails 23 serve to vary a position of the ampoule 21 gradually downward or upward between the respective upper rails 22 and the respective lower rails 24 as the conveyor 41 runs in its circumferential path. Configuration of the sloped rails 23 is not critical and may be non-linear. There are provided along the outside of the conveyor 41 guides 25, 26 of which the former serves to hold the ampoule 21 supported by the upper rails 22 or the sloped rails 23 between each pair of the adjacent projections 20, provided on the outer peripheral surface of the conveyor 41 and the latter serves to hold the ampoule 21 supported by the lower rails 24 between each pair of the adjacent projections 20 provided on the outer peripheral surface of the conveyor 41. Now referring to Figure 4, an inlet end 27 of the guide 26 is slightly curved outward in order that the ampoule 21 can be smoothly transferred from the guide 25 to the guide 26. As will be seen in Figure 5, the guide 26 is brought in a frictional contact with the side wall of the ampoule 21 so that the ampoule 21 is rotated thereby around its own axis as the conveyor 41 runs in its circumferential path. Referring again to Figures 1 and 2, a pair of ultrasonic vibrators 28 may be provided within the water tank 40 on both sides of the conveyor 41 so that the ampoule 21 which is held between the conveyor 41 and the guide 25 and is being conveyed may have its side wall applied with ultrasonic waves and thereby may be flushed. For a non-sealed container, there may be provided a nozzle at the inlet end (I) of the conveyor 41 immedia-tely above the sloped rail 23 and the container moving downward may be filled with flushing water injected from the nozzle as the conveyor 41 runs in its circumferential path as shown by Figure 3(a). Alternatively, the sloped rails 23 may be eliminated as in the embodiment shown by Figure 3(b) in which the upper rails 22 are arranged to be associated with the upper portion of the conveyor 41 and thereby to support the ampoule 21 above the water surface 39 while the lower rails 24 are arranged to be associated with the lower portion of the conveyor 41 and thereby to support the ampoule 21 below the water surface 39. In this embodi-ment, the ampoule 21 vertically falls between each pair of the adjacent projections 20 formed on the outer peripheral surface of the conveyor 41 when the ampoule 21 is transferred from the upper rail 22 to the lower rail 24. In this alternative embodiment, while water itself in the water tank has a shock-absorbing function, a portion of the lower rail 24 onto which the ampoule 21 falls is provided in case with a shock-absorbing member 24' made of rubber or the like. Referring again to Figure 1, there is provided adjacent the inlet end (I) of the conveyor 41 a star wheel 46 serving to transfer the ampoule 21 received from a feeder unit onto the conveyor 41 of the cooler and there is provided adjacent the outlet end (O) of the conveyor 41 a star wheel 47 serving to feed the ampoule 21 received from the conveyor 41 of the cooler to the subsequent process. The cooler of the invention having an arrangement as has been described above may be located, for example, as shown by Figure 6 and various units such as the feeder unit 31, a jet flusher unit 36, a sterilizing dryer unit 37 and a water supply unit 38 in order to achieve efficient flushing of the container such as the ampoule. The flusher of the invention operates in a manner as will be described. Referring to Figure 1, the ampoules 21 delivered from the feeder unit 31 to the star wheel 46 is fed at the inlet end (I) of the conveyor 41 into spaces defined between respective pairs of the adjacent projections 20 formed on the outer peripheral surface of the conveyor 41. The ampoules 21 now supported by the upper rail 22 are conveyed in a line at a predetermined velocity in the direction as indicated by the arrow as the conveyor 41 runs in its circumferential path. After transferred from the upper rail 22 onto the sloped rail 23, these ampoules 21 are now conveyed by the conveyor 41 gradually downward toward the lower rail 24, as shown by Figure 3(a). With the arrangement having no sloped rail 23, the ampoules 21 abruptly fall onto the lower rail 24, as shown by Figure 3(b). After transferred onto the lower rail 24, the container 21 is held in the space defined between each pair of the adjacent projections 20 formed on the outer peripheral surface of the conveyor 41 with the help of the guide 26, as shown by Figure 5. In this state, the guide 26 comes in a frictional contact with the side wall of the container 21 and, under the effect of friction, the container 21 begins to be rotated around its own axis as the conveyor 41 runs. The side wall of the container 21 being conveyed may be applied with the ultrasonic waves from a pair of the ultrasonic vibrators 28 provided on both sides of the conveyor 41, respectively. In this way, the container 21 being conveyed by the conveyor 41 and simultaneously rotated around its own axis under the frictional contact with the guide 26 can be evenly applied with the ultrasonic waves and thereby can be subjected to the efficient ultrasonic flushing. Further-more, the ultrasonic flushing can be optimized for a particular size of the container to be flushed merely by adjusting a distance between the container 21 and the ultrasonic vibrators 28. Also, no damage to the container will occur by controlling the time and output of the application of ultrasonic waves when the container 21 are conveyed in a line at a predetermined velocity and applied onto their side walls with the ultrasonic waves for a predetermined period of time. The container 21 which has been thus adequately flushed is further conveyed by the conveyor 41, then transferred onto the sloped rail 23 provided on the opposite side and delivered to the star wheel 47 at the outlet end (O) of the conveyor 41. Finally, the container 21 is transferred to the subsequent process such as the jet flusher unit 36 or the sterilizing dryer unit 37. For the sealed container, the nozzle used to fill the container with water or other liquid may be eliminated because the sealed container sinks under water by its own weight. Within the water tank 40, there is provided a cooling unit 43 having an outlet 44 and an inlet 45 for cooling water. The sealed container 42 has previously been filled with liquid and can sink under water within the water tank 40 as the conveyor 41 runs without a nozzle adapted to fill the container with water or other liquid. With such cooler, the sealed container 21 transferred from a feed star wheel 46 onto the conveyor 41 sinks into the water tank 40 as the conveyor 41 runs and, during conveyance, the sealed container 21 and the quantity of liquid contained therein are cooled by cooling water discharged from the cooling unit 43. The sealed container 21 thus cooled is delivered from the conveyor 41 to a discharging star wheel 47 which, in turn, delivers the container 21 to the subsequent process.

Claims: A cooler for cooling a container (21), the cooler comprising: a conveyor (41) for conveying the container (21) in a tank (40) in which the conveyor (41) and the container (21) conveyed by it is at least partially immersed in a coolant liquid; a cooling unit (43) being provided within the tank (40), the cooling unit having an inlet (44) and an outlet (45) for coolant liquid, characterised in that the conveyor (41) comprises raising and lowering means and conveys the container (21) in a generally upright orientation along a circumferential path into, along and out of the tank (40), and comprises guide means (25,26) disposed outside the conveyor (41), the conveyor and the guide means being urged together to establish a frictional contact between the side wall of the container (21) and the guide means (25,26) to cause the container to rotate around its axis. A container cooler according to claim 1, further comprising ultrasonic vibrators (28) arranged to apply ultrasonic waves to the side wall of the container (21) as it is rotated around its axis. A container cooler according to claim 1 or 2, wherein the conveyor (41) is provided on its outer peripheral surface with fin-like projections (20) vertically extending and circumferentially spaced from one another at regular intervals and extending above and below the coolant liquid level in the tank (40). A container cooler according to any one of the preceding claims, wherein there are provided around the conveyor (11) upper rails (22) and lower rails (24) both adapted to support the bottom of the containers (21) and wherein said lower rails (24) are immersed in the cooling liquid within the tank (40). A container cooler according to claim 4, further comprising a sloped rail (23) interposed between said lower (24) and upper (22) rails. A container cooler according to claim 4 or 5, in which the guide means (25, 26) are associated with the upper (22) and lower (24) rails, and, where present, the sloping rails (23).

Inventors: MARUOKA KAZUMI, SHIMIZU KATSUMI, YAMAGISHI KIYOSHI, MARUOKA, KAZUMI, SHIMIZU, KATSUMI, YAMAGISHI, KIYOSHI
Applicants: EISAI CO LTD, EISAI CO., LTD.
Application year: 1992
Main classification: B08B9
IPC codes: B08B3, B08B9