Cigarette with the amount of sidestream smoke reduced

Abstract

A cigarette is provided with a tobacco section including a tobacco filler rod wrapped with an inner wrapper paper sheet containing less than 4% by weight of calcium carbonate and an outer wrapper paper containing calcium carbonate in an amount of 30 g/m2 and a burn adjusting agent in an amount of 3% by weight or more.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a cigarette whose sidestream smoke amount reduced, and more specifically to a cigarette wrapped with an inner wrapper paper sheet and an outer wrapper paper sheet.

2. Description of the Related Art

Various techniques have been proposed in order to reduce the amount of sidestream smoke of cigarettes. For example, Japanese Patent No. 2572488 discloses a cigarette wrapped with an inner wrapper paper sheet having an air permeability of 1 to 5 CORESTA units and containing 1 to 8% by weight of a loading material (for example, calcium carbonate) and an outer wrapper paper sheet having a basis weight of 35 to 65 g/m² and containing 18 to 40% by weight of a loading material (for example, calcium carbonate). Further, Jap. Pat. Appln. KOKAI Publication No. 6-7141 discloses a cigarette wrapped with an inner wrapper paper sheet containing a magnesium-containing loading material and an outer wrapper paper sheet containing an additive package of alkali metal ions, alkaline-earth metal ions, inorganic anions and organic anions.

Each of the conventional cigarettes has a slow burn rate and therefore a small amount of sidestream smoke per unit time. However it has been found that these cigarettes entail a problem of a large amount of sidestream smoke per cigarette.

Accordingly, an object of the present invention is to provide a cigarette which is small not only in an amount of sidestream smoke per unit time, but also in an amount of sidestream smoke per cigarette.

BRIEF SUMMARY OF THE INVENTION

The above-described object of the present invention has been achieved by studying the wrapper paper itself that wraps cigarettes without providing a filter or technically improving the tobacco filler material (for example, cut tobacco).

Thus, according to the present invention, there is provided a cigarette characterized by comprising a tobacco section including a tobacco filler rod wrapped with an inner wrapper paper sheet containing less than 4% by weight of calcium carbonate and an outer wrapper paper containing calcium carbonate in an amount of 30 g/m² and a burn adjusting agent in an amount of 3% by weight or more.

DETAILED DESCRIPTION OF THE INVENTION

The present invention will now be described in more detail.

The cigarette of the present invention comprises a tobacco section including a tobacco filler rod wrapped with a predetermined inner wrapper paper sheet and a predetermined outer wrapper paper sheet. An ordinary filter may be attached to one end of the tobacco section.

Of the wrapper paper sheets wrapping the tobacco filler rod of the present invention, the inner wrapper paper sheet has a calcium carbonate content of less than 4% by weight, and thus does not substantially contain calcium carbonate. When the inner wrapper paper contains calcium carbonate in an amount of 4% by weight or more, the burn rate of the resultant cigarette becomes excessively high, and therefore the amount of the sidestream smoke per unit time cannot be significantly decreased. It is preferable that the inner wrapper paper does not contain calcium carbonate.

The pulp that constitutes the inner wrapper paper sheet may be any type pulp as long as it is a pulp that is usually employed for a wrapper paper sheet of a smoking article, such as flax pulp. It is preferable that the amount of pulp is 10 to 18 g/m². When the amount of pulp is less than 10 g/m², there is a tendency that it becomes difficult to stably manufacture the wrapper paper. On the other hand, when the amount of pulp exceeds 18 g/m², there is a tendency that the flavor of the cigarette becomes unfavorable.

As the air permeability of the inner wrapper paper sheet becomes lower, the amount of sidestream smoke of the resultant cigarette per unit time is further decreased. It is preferable that the air permeability of the inner wrapper paper sheet is 1 to 30 CORESTA units (CU), and more preferably, 6 CU to 30 CU.

The inner wrapper paper sheet may contain a burn adjusting agent, but the amount thereof is preferably up to 1% by weight (0 to 1% by weight). If the amount of the burn adjusting agent exceeds 1% by weight, there is a tendency that the resultant cigarette cannot maintain a preferable burn rate of 6 mm/minute or higher, which will be described later.

The burn adjusting agent added to the inner wrapper paper sheet can be selected from alkali metal salts of organic acids such as sodium citrate, potassium citrate, sodium acetate, potassium acetate, sodium tartrate, potassium tartrate, sodium malate, potassium malate, sodium succinate, potassium succinate and the like.

The outer wrapper paper sheet employed in the present invention contains calcium carbonate in an amount of 30 g/m² or more and a burn adjusting agent in an amount of 3% by weight or more. When the amount of calcium carbonate is less than 30 g/m² and/or the amount of the burn adjusting agent is less than 3% by weight, the effect of reducing the amount of the sidestream smoke is not sufficiently exhibited. It is preferable that calcium carbonate is contained in an amount of 30 g/m² or more and 50 g/m² or less, and the burn adjusting agent is contained in the wrapper paper in an amount of 3 to 15% by weight.

As the burn adjusting agent used in the outer wrapper paper sheet, alkali metal salts of succinic acids are preferably used. Of these, potassium succinate and sodium succinate are particularly preferable. These materials can be used singly or in combination.

The pulp that constitutes the outer wrapper paper sheet may be of the same type as that used for the inner wrapper paper sheet. It is preferable that the amount of pulp is 20 to 50 g/m².

Further, it is preferable that the outer wrapper paper sheet has a basis weight of 50 g/m² to 100 g/m².

In the present invention, calcium carbonate is added in the form of grains. The grain diameter can be selected arbitrarily in consideration of cost and easiness of making paper, but it should preferably be 0.02 μm to 10 μm.

The cigarette of the present invention, which has the tobacco section doubly wrapped with the inner wrapper paper sheet and the outer wrapper paper sheet, is small in the sidestream smoke amount per unit time, but also in the sidestream smoke amount per cigarette. The outer wrapper paper sheet, which contains a relatively large amount of calcium carbonate, has a high combustibility. When it is combined with the inner wrapper paper sheet, which does not substantially contain calcium carbonate, the burn rate becomes lower than the case where the outer wrapper paper sheet is employed solely, the amount of the sidestream smoke per unit time is decreased, and the amount of the sidestream smoke per cigarette is significantly decreased, too. It is preferable that the burn rate of the cigarette of the present invention is about 6 mm/minute or higher, and more preferably, 7 mm/minute or higher. Such a burn rate can be achieved by setting the content of the burn adjusting agent of the inner wrapper paper sheet to 0 to 1% by weight as described above. The burn rate of the cigarette of the present invention is usually no more than about 12 mm/minute. It should be noted that the burn rate of a cigarette can be measured by an ordinary fishtail method.

The present invention will now be described by way of Examples; however it is not limited to these Examples.

EXAMPLES 1-4 AND COMPARATIVE EXAMPLES 1-3

Cigarettes of the structure below were prepared.

Specification of Cigarettes

Size: FSK slim (circumference of 22.9 mm, length of the tobacco section of 68 mm, length of the filter of 30 mm and length of the tipping paper of 37 mm)

Cut tobacco: American blend, 0.565 g/cigarette

Specification of Outer Wrapper Paper

Amount of pulp: 30 g/m²

Amount of calcium carbonate: 30 g/m²

Amount of citrate: 4.5% by weight

Specification of Inner Wrapper Paper

As indicated in Table 1 below.

With regard to each of the cigarettes, the amount of the sidestream smoke (total particulate matter) was measured (for a burned length of 58 mm) together with the burn rate by the fishtail method. Thus, the amount of the sidestream smoke per unit time (mg/min) and the amount of the sidestream smoke per cigarette (mg/cigarette) were calculated. The results are shown also in Table 1.

	TABLE 1
	Specification of inner wrapper paper	Cigarette
	Calcium			Amount of	Burn time
	carbonate	Air		sidestream	Second	Burn
	Pulp		% by	permeability	Sodium citrate	smoke	(burn length	rate
Example No.	g/m2	g/m2	weight	CU	% by weight	mg/cig	mg/min	of 58 mm)	mm/min
Comp. Ex. 1	No inner wrapper paper (outer wrapper paper only)	15.5	2.5	372	9.354
Comp. Ex. 2-1	15	5	25	33	0.0	14.7	2.4	371	9.380
Comp. Ex. 2-2					3.9	14.1	2.3	377	9.230
Comp. Ex. 2-3					8.2	13.9	2.2	389	8.946
Comp. Ex. 2-4					13.6	13.9	2.0	427	8.149
Comp. Ex. 3-1	15	0.6	4	34	0.0	14.0	2.0	429	8.111
Comp. Ex. 3-2					0.7	13.7	1.9	442	7.873
Comp. Ex. 3-3					1.3	13.6	1.8	449	7.750
Comp. Ex. 3-4					2.4	13.6	1.8	464	7.500
Example 1-1	15	0.3	2	30	0.0	13.6	1.7	470	7.404
1-2					0.8	13.3	1.6	497	7.002
1-3					1.8	13.2	1.5	519	6.705
1-4					2.5	13.2	1.4	548	6.350
Example 2-1	15	0	0	31	0.0	13.6	1.6	506	6.877
2-2					0.9	13.0	1.5	537	6.480
2-3					1.8	13.2	1.4	556	6.258
2-4					2.6	13.0	1.3	587	5.928
Example 3-1	15	0	0	15	0.0	13.4	1.5	524	6.641
3-2					0.7	13.0	1.4	543	6.408
3-3					1.8	12.9	1.4	571	6.094
3-4					2.6	12.9	1.3	593	5.868
Example 4-1	15	0	0	6	0.0	13.3	1.5	543	6.408
4-2					0.7	12.6	1.3	563	6.181
4-3					1.7	12.5	1.3	582	5.979
4-4					2.4	12.4	1.2	598	5.819

As can be seen from the results shown in Table 1, the cigarettes of the present invention each indicated a significant decrease in amounts of sidestream smoke both per unit time and per cigarette. In particular, as compared to the cigarette wrapped with the outer wrapper paper sheet only (Comparative Example 1), the amount of the sidestream smoke per unit time and the amount of the sidestream smoke per cigarette of the cigarette of the present invention are remarkably reduced. Further, it is understood from the comparison between the cigarettes of the present invention and those of Comparative Examples 3-1 to 3-4 that the amount of the sidestream smoke per unit time and the amount of the sidestream smoke per cigarette of the cigarette of the present invention are remarkably reduced when the amount of calcium carbonate contained in the inner wrapper paper sheet is set to less than 4% by weight. Furthermore, each of the cigarettes of the present invention exhibited a burn rate of about 6 mm/min or more and showed a significant decrease in both of the amount of the sidestream smoke per unit time and the amount of the sidestream smoke per cigarette.

Various embodiments of the present invention have been described above; however the invention is not limited to these embodiments. Needless to mention, the above-described embodiments can be combined appropriately.

According to the present invention, there is provided a cigarette small not only in the amount of sidestream smoke per unit time but also in the amount of sidestream smoke per cigarette.

Claims

1. A regenerative energy and/or mass exchange assembly, comprising: a) an exchange media; b) a first chamber having a first fluid channel adjacent the exchange media to pass a first fluid stream through the exchange media; c) at least a second chamber having a second fluid channel adjacent the exchange media to pass a second fluid stream through the exchange media, the first and at least second chambers separated by a divider; and d) at least one fluid stream diverter adjacent the exchange media, the at least one diverter having an adjustable orientation relative to the chambers and providing separate flow communications to the chambers through the respective fluid channels, the at least one fluid stream diverter having a radial extent that is less than the functional radial extent of the exchange media, this functional radial extent of the exchange media being defined by the fluid conducting area of the exchange media adjacent the fluid channels; and wherein, at any given diverter orientation, the separate flow communications are not in fluid communication with the same chamber.

2. An exchange assembly according to claim 1 further comprising at least one housing connected to one end of the exchange media and wherein the fluid channels are provided in the housing.

3. An exchange assembly according to claim 2 wherein the at least one housing has interior walls defining an inner enclosure, and the at least one fluid stream diverter is provided in the inner enclosure.

4. (canceled)

5. An exchange assembly according to claim 3 wherein the fluid stream diverter is rotatably mounted within the inner enclosure to provide the diverter with the adjustable orientation.

6. (canceled)

7. (canceled)

8. (canceled)

9. An exchange assembly according to claim 5 further comprising a shaft that extends rotatably through the exchange media and the at least one housing connected to one end of the exchange media, and wherein the fluid stream diverter is fixed to the shaft.

10. (canceled)

11. An exchange assembly according to claim 3 wherein the at least one housing connected to one end of the exchange media comprises a connection portion and a dispersion portion which are in fluid communication with each other.

12. An exchange assembly according to claim 11 wherein the connection portion has at least one port in flow communication with each respective fluid channel, each port adapted to connect to external fluid stream sources.

13. An exchange assembly according to claim 11 wherein the dispersion portion has an open end that is in fluid communication with the exchange media.

14. An exchange assembly according to claim 11 wherein the connection portion has a radial extent that is less than the radial extent of the dispersion portion.

15. An exchange assembly according to claim 11 wherein the inner enclosure is substantially disposed within the connection portion.

16. An exchange assembly according to claim 15 wherein the fluid stream diverter has a radial extent that is substantially equal to the radial extent of the inner enclosure.

17. An exchange assembly according to claim 11 wherein the dispersion portion comprises the first and at least second chambers.

18. An exchange assembly according to claim 17 wherein the exchange media is housed in a plurality of media cavities that are separated from one another in cross section and extend in parallel along the exchange media, and wherein the plurality of cavities that house the exchange media are disposed within a central housing.

19. An exchange assembly according to claim 18 wherein each cavity is thermally insulated from adjacent cavities.

20. An exchange assembly according to claim 18 wherein the plurality of media cavities are positioned in correspondence to the chambers of the dispersion portion.

21. A regenerative energy and/or mass exchange assembly, comprising: a) an exchange media; b) a first chamber having a first fluid channel adjacent the exchange media to pass a first fluid stream through the exchange media; c) at least a second chamber having a second fluid channel adjacent the exchange media to pass a second fluid stream through the exchange media, the first and at least second chambers separated by a divider; d) at least one fluid stream diverter adjacent the exchange media, the at least one diverter having an adjustable orientation and providing separate flow communications to the chambers through the respective fluid channels, the at least one fluid stream diverter having a radial extent that is less than the functional radial extent of the exchange media, this functional radial extent of the exchange media being defined by the fluid conducting area of the exchange media adjacent the fluid channels, and wherein, at any given diverter orientation, the separate flow communications are not in fluid communication with the same chamber, and e) at least one housing connected to one end of the exchange media, the fluid channels being provided in the housing, the at least one housing having interior walls defining an inner enclosure, the at least one fluid stream diverter being provided in the inner enclosure, the at least one housing further including a connection portion and a dispersion portion which are in fluid communication with each other, the dispersion portion comprising the first and at least second chambers, and wherein f) the exchange media is housed in a plurality of media cavities that are separated from one another in cross section and extend in parallel along the exchange media, the plurality of cavities that house the exchange media being disposed within a central housing, and the media cavities and the chambers being substantially equal in cross section and substantially evenly spaced about the axial direction.

22. An exchange assembly according to claim 21, wherein the number of chambers is three, and the number of media cavities is three.

23. An exchange assembly as accordingly to claim 21, wherein the number of chambers is five, and the number of media cavities is five.

24. A regenerative energy and/or mass exchange assembly, comprising: a) an exchange media; b) a first chamber having a first fluid channel adjacent the exchange media to pass a first fluid stream through the exchange media; c) at least a second chamber having a second fluid channel adjacent the exchange media to pass a second fluid stream through the exchange media, the first and at least second chambers separated by a divider; d) at least one fluid stream diverter adjacent the exchange media, the at least one diverter having an adjustable orientation and providing separate flow communications to the chambers through the respective fluid channels, the at least one fluid stream diverter having a radial extent that is less than the functional radial extent of the exchange media, this functional radial extent of the exchange media being defined by the fluid conducting area of the exchange media adjacent the fluid channels, and wherein, at any given diverter orientation, the separate flow communications are not in fluid communication with the same chamber; and wherein, at any given diverter orientation, the separate flow communications are not in fluid communication with the same chamber; and e) at least one housing connected to one end of the exchange media, the fluid channels being provided in the housing, the at least one housing having at least one interior wall defining an inner enclosure, the at least one fluid stream diverter being provided in the inner enclosure, the at least one housing further including a connection portion and a dispersion portion which are in fluid communication with each other, the dispersion portion comprising the first and at least second chambers, and wherein f) the exchange media is housed in a plurality of media cavities that are separated from one another in cross section and extend in parallel along the exchange media, the plurality of cavities that house the exchange media being disposed within a central housing, and wherein g) the fluid stream diverter comprises in sequence along the axial direction a first segment, a first reduced diameter portion, a second segment, a second reduced diameter portion, and a third segment; an inner bore defining an inner space within the fluid stream diverter; a first passage extending from a first port in the outer wall of the second reduced diameter portion through the inner space and then to a second port on the outer wall of the first segment; a second passage extending from a third port on the end wall of the first segment adjacent to the first reduced diameter portion to a fourth port on the outer wall of the first segment; and wherein the said first and second passages are isolated from each other.

25. An exchange assembly according to claim 24 wherein sealing means is provided between the fluid stream diverter and the connection portion.

26. An exchange assembly according to claim 24 wherein sealing means is provided between each of the first, second, and third segments the at least one interior wall defining the inner enclosure and each of the first, second, and third segments, respectively, of the fluid stream diverter.

27. An exchange assembly according to claim 18 wherein the connection portion has an open end and a closing means which closes the open end.

28. An exchange assembly according to claim 18 further comprising snap-connection means provided between the central housing and the housing connected to one end of the exchange media.

29. An exchange assembly according to claim 18 wherein the assembly has a first end housing and a second end housing disposed on either end of the exchange media.

30. An exchange assembly according to claim 29 wherein a first fluid stream diverter is disposed in the first end housing and a second fluid stream diverter is disposed within the second end housing.

31. An exchange assembly according to claim 30 wherein the plurality of chambers of the dispersion portion of the first end housing is in substantial axial alignment with the corresponding plurality of chambers of the dispersion portion of the second end housing.

32. An exchange assembly according to claim 31 wherein the first and second fluid stream diverters are disposed correspondingly in the respective end housings and rotate in phase during operation.

33. A method of exchanging energy and/or mass between at least two fluid streams, the method comprising: (a) providing an exchange media; (b) passing a first fluid stream through a first flow path comprising a first chamber having a first fluid channel, the first fluid channel being in fluid communication with a first region of the exchange media; (c) passing at least a second fluid stream through at least a second flow path comprising at least a second chamber having a second fluid channel, the at least second fluid channel being in fluid communication with a second region of the exchange media, and the first and at least second chambers being separated by a divider; (d) providing at least one fluid stream diverter adjacent the exchange media, the fluid stream diverter having a radial extent less than the functional radial extent of the exchange media, the functional radial extent of the exchange media being defined by the fluid conducting area of the exchange media adjacent the fluid channels, the fluid stream diverter having an adjustable orientation relative to the chambers and providing separate flow communications to the chambers through the respective fluid channels; (e) changing the flow paths of the fluid streams to the exchange media by adjusting the orientation of the diverter so that at least one of the fluid streams is passed through one of the exchange media regions through which a different fluid stream had passed prior to changing the flow paths; and wherein at any one of before, after, and during the changing of the flow paths, the separate fluid streams are not in flow communication with the same chamber.

34. (canceled)

35. A method according to claim 33 wherein the fluid stream diverter is provided in a housing connected to one end of the exchange media.

36. A method according to claim 35 wherein the housing and the fluid stream diverter cooperate to form the flow paths.

37. A method according to claim 36 wherein the fluid stream diverter is rotatably mounted within the housing.

38. A method according to claim 37 wherein the exchange media is housed in a plurality of cavities that are separated from one another in cross section and extend in parallel along the direction of fluid stream flow.

39. A method according to claim 38 wherein the fluid stream diverter rotates to pass the different fluid streams through the exchange media.

40. A method according to claim 38 wherein the fluid stream diverter rotates to pass the different fluid streams through different cavities of the exchange media.

41. A method according to claim 40 wherein in step (e), the at least one of the fluid streams that is passed through an exchange media region through which a different fluid stream had passed prior to changing the flow paths flows though the region in the same direction as the prior different fluid stream.

42. A method according to claim 38 wherein in step (e), the at least one of the fluid streams that is passed through an exchange media region through which a different fluid stream had passed prior to changing the flow paths flows through the region in the opposite direction as the prior different fluid stream.

43. A regenerative energy and/or mass exchange assembly, comprising: a) an exchange media housed in a plurality of cavities that are separated from one another in cross section and extend in parallel along the direction of fluid stream flow, the plurality of cavities being disposed in a central housing and each cavity being thermally insulated from adjacent cavities; b) a first flow path to pass a fluid stream through the exchange media; c) at least a second flow path to pass a further fluid stream through the exchange media; d) at least one housing connected to one end of the exchange media, the flow paths being provided in the housing; e) at least one fluid stream diverter that cooperates with the housing to form the flow paths, the at lest one diverter having a radial extent that is generally less than the radial extent of the exchange media and being rotatably mounted within the housing to divert the different flow paths to pass the respective fluid streams through different cavities of the exchange media; and f) a shaft that extends through the exchange media, the at least one housing connected to one end of the exchange media, and the fluid stream diverter rotatably mounted within the housing; and wherein the at least one housing connected to one end of the exchange media comprises a connection portion and a dispersion portion which are in fluid communication with each other; the connection portion has at least two ports adapted to connect to external fluid stream sources and a radial extent that is generally less than the radial extent of the dispersion portion, the diverter being substantially disposed within the connection portion and having a radial extent that is substantially equal to the radial extent of an inner wall of the connection portion; the dispersion portion has an open end that is in fluid communication with the exchange media, the dispersion portion comprising a plurality of chambers that are separated from one another; and the plurality of cavities that house the exchange media are disposed within a central casing, each cavity being thermally insulated from adjacent cavities and being positioned in correspondence to the chambers of the dispersion portion, the cavities and the chambers being substantially equal in cross-section and substantially evenly spaced about the axial direction, the quantity of cavities and chambers be equal to each other and equal to a quantity of one of the group consisting of three and five; and wherein the fluid stream diverter comprises in sequence along the axial direction a first segment, a first reduced diameter portion, a second segment, a second reduced diameter portion, and a third segment; an inner bore defining an inner space within the fluid stream diverter; a first passage extending from a first port in the outer wall of the second reduced diameter portion through the inner space and then to a second port on the outer wall of the first segment; a second passage extending from a third port on the end wall of the first segment adjacent to the first reduced diameter portion to a fourth port on the outer wall of the first segment; and wherein the said first and second passages are isolated from each other.

44. An exchange assembly according to claim 43 wherein sealing means is provided between the fluid stream diverter and the connection portion.

45. An exchange assembly according to claim 44 wherein sealing means is provided between each of the first, second, and third segment, of the fluid stream diverter and the inner wall of the connection portion.

46. An exchange assembly according to claim 45 wherein the connection portion has an open end and a closing means which closes the open end.

47. A regenerative energy and/or mass exchange assembly, comprising: a) an exchange media housed in a plurality of cavities that are separated from one another in cross section and extend in parallel along the direction of fluid stream flow; b) a first flow path to pass a fluid stream through the exchange media; c) at least a second flow path to pass a further fluid stream through the exchange media; (d) at least one housing connected to one end of the exchange media, the flow paths being provided in the housing; (e) at least one fluid stream diverter that cooperates with the housing to form the flow paths, the at lest one diverter having a radial extent that is generally less than the radial extent of the exchange media and being rotatably mounted within the housing to divert the different flow paths to pass the respective fluid streams through different cavities of the exchange media; and (f) a shaft that extends through the exchange media, the at least one housing connected to one end of the exchange media, and the fluid stream diverter rotatably mounted within the housing; and wherein the at least one housing connected to one end of the exchange media comprises a connection portion and a dispersion portion which are in fluid communication with each other; the connection portion has at least two ports adapted to connect to external fluid stream sources and a radial extent that is generally less than the radial extent of the dispersion portion, the diverter being substantially disposed within the connection portion and having a radial extent that is substantially equal to the radial extent of an inner wall of the connection portion; the dispersion portion has an open end that is in fluid communication with the exchange media, the dispersion portion comprising a plurality of chambers that are separated from one another; the plurality of cavities that house the exchange media are disposed within a central housing; and the assembly further comprising snap-connection means provided between the central housing and the housing connected to one end of the exchange media.

48. A regenerative energy and/or mass exchange assembly, comprising: (a) an exchange media having a casing; (b) at least one housing attached to one end of the casing, the housing having: i) a dispersion end with a first and at least a second chamber adjacent the exchange media, the first and at least second chambers separated by a divider; ii) a connection end with first and at least second ports for connection to external fluid flows; and iii) an inner enclosure providing fluid communication between the chambers of the dispersion end and the ports of the connection end; (c) a fluid stream diverter substantially disposed in the inner enclosure of the housing, the fluid stream diverter having an adjustable orientation within the housing and cooperating with the housing to form at least two separate movable fluid channels extending between the ports and the chambers; and (d) sealing means provided between the housing and the fluid stream diverter for preventing fluid cross-flow between the at least two movable fluid channels, the movable fluid channels providing separate flow communications between the ports and the chambers independent of the attachment of the housing to the casing, and wherein, at any given diverter orientation, the separate flow communications are not in fluid communication with the same chamber.

49. The exchange assembly of claim 48 wherein the diverter is generally cylindrical in shape and wherein the at least two movable fluid channels comprise respective first and second annular grooves provided in the diverter and separated by an annular wall.

50. The exchange assembly of claim 49 wherein the sealing means comprises an o-ring disposed between the annular wall and an inner surface of the housing.