Preform injection molding device

Abstract

An injection molding device including a middle flow channel which forms an intermediate layer of a preform which is subject to biaxial stretch blow molding. The middle flow channel s segmented into a predetermined number of flow sub-channels by vertical blocking rib piece(s). Side wall's upstream portions of the vertical blocking rib piece are formed as angled surfaces whose distance from each other decreases from the downstream side to the upstream side, and/or, an end portion of the vertical blocking rib piece that is located on the downstream side is tucked in at least one of the inner flow channel and the outer flow channel.

Claims

1. An injection molding device that injection molds a preform which is subject to biaxial stretch blow molding and which includes at least one intermediate layer laminated between substrate layers, the injection molding device including a nozzle section through which a main resin used to form the substrate layers and an intermediate layer resin used to form the intermediate layer are injected, the nozzle section including at least three cylindrical layer-forming flow channels disposed coaxially, the three cylindrical layer-forming flow channels including an inner flow channel and an outer flow channel, which are used to form the substrate layers each made of the main resin, and a middle flow channel, which is located between the inner flow channel and the outer flow channel and is used to form the intermediate layer made of the intermediate layer resin, and the middle flow channel being segmented into a predetermined number of flow sub-channels by at least one vertical blocking rib piece disposed transversely within the middle flow channel on a downstream side thereof, wherein (i) the vertical blocking rib piece has a pair of side walls located on both sides of the vertical blocking rib piece in a circumferential direction, and the pair of side walls each include a side wall's upstream portion located on an upstream side, the side wall's upstream portions being formed as angled surfaces whose distance from each other decreases from the downstream side to the upstream side, and/or (ii) an end portion of the vertical blocking rib piece that is located on the downstream side is tucked in at least one of the inner flow channel and the outer flow channel.

2. The injection molding device of claim 1, wherein the at least one vertical blocking rib piece comprises a plurality of vertical blocking rib pieces, and the pair of side walls each further include a side wall's downstream portion located on the downstream side, and a side clearance between the side wall's downstream portions included in any two adjacent vertical blocking rib pieces is constant from the upstream side to the downstream side.

3. The injection molding device of claim 1, wherein the end portion of the vertical blocking rib piece that is located on the downstream side is tucked at least in the outer flow channel.

4. The injection molding device of claim 1, wherein (i) the vertical blocking rib piece has the pair of side walls located on both sides of the vertical blocking rib piece in the circumferential direction, and the pair of side walls each include the side wall's upstream portion located on the upstream side, the side wall's upstream portions being formed as angled surfaces whose distance from each other decreases from the downstream side to the upstream side, and (ii) the end portion of the vertical blocking rib piece that is located on the downstream side is tucked in at least one of the inner flow channel and the outer flow channel.

5. The injection molding device of claim 1, wherein the nozzle section includes an inner ring mandrel including inside thereof the inner flow channel, a middle ring mandrel surrounding the inner ring mandrel and including the middle flow channel between the middle ring mandrel and the inner ring mandrel, and an outer ring mandrel surrounding the middle ring mandrel and including the outer flow channel between the outer ring mandrel and the middle ring mandrel, and at least the inner ring mandrel is coated with a repellency-enhancing film.

6. The injection molding device of claim 5, wherein the film applied to the inner ring mandrel comprises a titanium nitride (TiN) film or a NiP/PTFE film containing nickel phosphide (NiP) and polytetrafluoroethylene (PTFE).

7. The injection molding device of claim 5, wherein a base material of the inner ring mandrel comprises stainless.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the accompanying drawings:

(2) FIG. 1 is a sectional view schematically illustrating an injection molding device according to the first embodiment of the present disclosure;

(3) FIG. 2 is a front view illustrating an inner ring mandrel used in the injection molding device of FIG. 1;

(4) FIG. 3 is a perspective view illustrating the inner ring mandrel of FIG. 2 as viewed from a downstream side;

(5) FIG. 4 is a bottom view illustrating the inner ring mandrel of FIG. 2 as viewed from the downstream side;

(6) FIG. 5 is a bottom view illustrating, similarly to FIG. 4, a modified example of the inner mandrel according to the first embodiment;

(7) FIG. 6 is a partially enlarged sectional view schematically illustrating a periphery of a nozzle section of an injection molding device according to the second embodiment of the present disclosure;

(8) FIG. 7 is a partially enlarged sectional view illustrating a periphery of a nozzle section according to a modified example of the second embodiment of FIG. 6;

(9) FIG. 8 is a perspective view illustrating an inner ring mandrel of the injection molding device of FIG. 7 as viewed from a downstream side;

(10) FIG. 9 is a bottom view illustrating the inner ring mandrel of the injection molding device of FIG. 7 as viewed from the downstream side;

(11) FIG. 10A is a front view illustrating an exemplary laminated bottle according to Patent Literature 2, and FIG. 10B is a sectional view of the laminated bottle taken along a line A-A in FIG. 10A;

(12) FIG. 11A is a half sectional view illustrating a preform used to mold the laminated bottle of FIGS. 10A and 10B, as viewed from front, and FIG. 11B is a sectional view of the preform taken along a line B-B in FIG. 11A;

(13) FIG. 12 is a sectional view illustrating an exemplary device for injection molding the preform of FIGS. 11A and 11B;

(14) FIG. 13 is a front view illustrating an inner ring mandrel used in the injection molding device of FIG. 12;

(15) FIG. 14 is a perspective view illustrating the inner ring mandrel of FIG. 13 as viewed from a downstream side; and

(16) FIG. 15 is a bottom view illustrating the inner ring mandrel of FIG. 13 as viewed from the downstream side.

DETAILED DESCRIPTION

(17) The following describes an injection molding device according to preferred embodiments of the present disclosure in detail with reference to the drawings. FIG. 1 is a sectional view schematically illustrating an injection molding device according to the first embodiment of the present disclosure, FIG. 2 is a front view illustrating an inner ring mandrel used in the injection molding device of FIG. 1, FIG. 3 is a perspective view illustrating the inner ring mandrel of FIG. 2 as viewed from a downstream side, and FIG. 4 is a bottom view illustrating the inner ring mandrel of FIG. 2 as viewed from the downstream side.

(18) In FIG. 1, reference numeral 1 denotes a nozzle section, which is a component of the injection molding device, and reference 2 denotes a hot runner block mounted on an upstream side of the nozzle section 1. Reference numerals A and B denote resin supply units configured to separately supply two different types of resins (i.e., a main resin and an intermediate layer resin) in their molten states. Although not illustrated, as a mold used to mold a preform, the one similar to a mold 301 illustrated in FIG. 12 is fixed to the downstream side of the nozzle section 1.

(19) The nozzle section 1 includes a cylindrical shut-off pin 11 disposed at center and also includes an inner ring mandrel 12, a middle ring mandrel 13, and an outer ring mandrel 14 that have a cylindrical shape and are disposed in this order coaxially about the shut-off pin 11. With the above structure, three layer-forming flow channels are formed in total. That is to say, a cylindrical inner flow channel 15 (which is also columnar in a region thereof that is above a tip of the shut-off pin 11) for flow of the main resin used to form an inner layer of the preform is formed between the shut-off pin 11 and the inner ring mandrel 12. A cylindrical middle flow channel 16 for flow of the intermediate layer resin used to form an intermediate layer of the preform is also formed between the inner ring mandrel 12 and the middle ring mandrel 13. An outer flow channel 17 for flow of the main resin used to form an outer layer of the preform is also formed between the middle ring mandrel 13 and the outer ring mandrel 14.

(20) The middle flow channel 16 and the outer flow channel 17 have end portions on the downstream side where these channels are reduced in diameter to form a tapered cylindrical channel portion. Further downstream of the tapered cylindrical channel portion, a cylindrical joining flow channel 19 is formed, via a confluence 18 where the resins having passed the layer-forming flow channels join together.

(21) In the tapered cylindrical channel portion, vertical blocking rib pieces 20 are disposed transversely within the middle flow channel 16 to segment the middle flow channel 16 into the same number of flow sub-channels as the number of the vertical blocking rib pieces 20. In the present embodiment, as illustrated in FIGS. 2 to 4, a total of eight vertical blocking rib pieces 20 are disposed at an equal interval in the circumferential direction in a tapered portion of the inner ring mandrel 12, i.e., in the end portion on the downstream side of the middle flow channel 16.

(22) Herein, as illustrated in FIG. 4, each vertical blocking rib piece 20 has a pair of side walls 20a located on both sides of the vertical blocking rib piece 20 in the circumferential direction, and the pair of side walls 20a each include a side wall's upstream portion 20b located on the upstream side of the middle flow channel 16 (i.e., on the outer side of the inner ring mandrel 12 in the radial direction). These side wall's upstream portions 20b are formed as angled surfaces whose distance from each other decreases from the downstream side to the upstream side of the middle flow channel 16 (i.e., from the inner side to the outer side of the inner ring mandrel 12 in the radial direction).

(23) Furthermore, the pair of side walls 20a in the vertical blocking rib piece 20 each include a side wall's down stream portion 20c located on the downstream side of the middle flow channel 16 (i.e., on the inner side of the inner ring mandrel 12 in the radial direction). A side clearance s between the side wall's downstream portions 20c included in any two adjacent vertical blocking rib pieces 20 is constant from the upstream side to the downstream side (i.e., from the outer side to the inner side of the inner ring mandrel 12 in the radial direction).

(24) As illustrated in FIG. 1, further upstream of the three layer-forming flow channels, there are formed flow channels through which the molten resins flow from the hot runner block 2. In the present embodiment, two manifolds 22 and 23 communicating with an introduction channel 21 are in communication with the inner flow channel 15 and the outer flow channel 17, respectively. In addition to the introduction channel 21, an introduction channel 24 is also formed in communication with the middle flow channel 16 through the manifold 25.

(25) On the other hand, the hot runner block 2 mounted on the upstream side of the nozzle section 1 is provided with a supply port 26 for introduction of the main resin that has been supplied from the resin supply unit A and a hot runner 27 connecting the supply port 26 and the aforementioned introduction channel 21. The hot runner block 2 is further provided with a supply port 28 for introduction of the intermediate layer resin that has been supplied from the resin supply unit B and a hot runner 29 connecting the supply port 28 and the aforementioned introduction channel 24. Further downstream of the hot runner 29, there is also provided a check valve 30 having a backflow prevention function using a ball valve to start and stop supply of the intermediate layer resin immediately with high precision. Additionally, the check valve 30 may also be provided in the nozzle section 1.

(26) To mold a preform with use of the injection molding device structured as above, one may introduce the molten main resin to the supply port 26 from the resin supply unit A and introduce the molten intermediate layer resin to the supply port 28 from the resin supply unit B. By doing so, the molten main resin passes along the hot runner 27 and the introduction channel 21 and then, is divided by the manifolds 22 and 23 to be introduced to the inner flow channel 15 and the outer flow channel 17. On the other hand, when the check valve 30 is open, the molten intermediate layer resin passes along the hot runner 29 and the introduction channel 24 and then, is introduced to the middle flow channel 16 through the manifold 25.

(27) Herein, as illustrated in FIG. 4, the side wall's upstream portions 20b included in each vertical blocking rib piece 20 disposed in the middle flow channel 16 are formed as the angled surfaces having a width between each other decreasing on the upstream side (i.e., on the outer side of the inner ring mandrel 12 in the radial direction). This structure allows the flow of the molten intermediate layer resin, which is supposed to flow along the middle flow channel 16 from the upstream side to the downstream side (i.e., from the outer side to the inner side of the inner ring mandrel 12 in the radial direction), to progress without being interrupted by the vertical blocking rib pieces 20. Any built-up of the molten resin within the injection molding device might cause resin burning (carbonization), and the carbonized resin might get mixed in the preform as impurities. Furthermore, when adhering to the vertical blocking rib pieces 20 and so forth, the carbonized resin narrows the middle flow channel 16. In this case, the resulting intermediate layer and vertical connecting zones might not achieve the desired dimensions. However, thus forming the side wall's upstream portions 20b as the angled surfaces prevents these troubles effectively.

(28) Furthermore, as illustrated in FIG. 4, the side clearance s between the side wall's downstream portions 20c included in any two adjacent vertical blocking rib pieces 20 is constant from the upstream side to the downstream side. This structure allows the intermediate layer resin to flow between the side wall's downstream portions 20c, thereby stabilizing a flow range (width) of the intermediate layer resin.

(29) Then, as illustrated in FIG. 1, after being segmented into eight streams in the circumferential direction, the intermediate layer resin flows between the main resin from the inner flow channel 15 and the main resin from the outer flow channel 17 at the confluence 18, where the intermediate layer resin is laminated coaxially between the main resin layers over a predetermined time range to form a multi-layer molten resin fluid. The multi-layer molten resin fluid is injected and filled into a cavity of the mold which is not illustrated. Since supply of the intermediate layer resin may be switched between start and stop immediately with high precision simply by opening and closing the check valve 30, the intermediate layer is laminated in a predetermined range extending right below the lower end of the neck ring to the upper end of the bottom as illustrated in FIG. 10A, by starting supply of the intermediate layer resin a predetermined time period later than a starting time of supply of the main resin, and by stopping supply of the intermediate layer resin a predetermined time period earlier than a stopping time of supply of the main resin. However, the range over which the intermediate layer is laminated is not limited to the example of FIG. 10A.

(30) Additionally, although in the example of FIG. 4 the side wall's upstream portions 20b included in each vertical blocking rib piece 20 are connected to form an acute angle therebetween, the vertical blocking rib piece 20 may further include an outer wall portion 20d located between the side wall's upstream portions 20b on the outer side in the radial direction as illustrated in FIG. 5. Furthermore, the vertical blocking rib piece 20 may also be disposed on the inner surface of the middle ring mandrel 13 instead of the inner ring mandrel 12.

(31) The following describes an injection molding device according to the second embodiment of the present disclosure with reference to FIG. 6. As illustrated in FIG. 6, in the second embodiment, an inner circumferential end 13a of the middle ring mandrel 13 is located on the outer side of an inner circumferential end 20e of each vertical blocking rib piece 20 in the radial direction (i.e., the inner circumferential end 13a is located on the upstream side of the inner circumferential end 20e of the vertical blocking rib piece 20 in the outer flow channel 17). Besides, the inner circumferential end 13a is in contact with the vertical blocking rib piece 20. Thus, a downstream side end portion of the vertical blocking rib piece 20 that extends from the inner circumferential end 13a to the inner circumferential end 20e is tucked in the outer flow channel 17. Meanwhile, in the first embodiment, the inner circumferential end 13a is aligned with the inner circumferential end 20e in the radial direction.

(32) To mold a preform by using the injection molding device according to the second embodiment, one may similarly introduce the molten main resin to the supply port 26 from the resin supply unit A and introduce the molten intermediate layer resin to the supply port 28 from the resin supply unit B as illustrated in FIG. 1. By doing so, as illustrated in FIG. 6, the main resin is introduced to the inner flow channel 15 and the outer flow channel 17, and the intermediate layer resin is introduced to the middle flow channel 16. Arrows designated by reference numerals a, b, and c in FIG. 6 respectively represent flow of the main resin in the inner flow channel 15, flow of the intermediate layer resin in the middle flow channel 16, and flow of the main resin in the outer flow channel 17.

(33) Similarly to the first embodiment, after being segmented into eight streams in the circumferential direction by the vertical blocking rib pieces 20, the intermediate layer resin b flows toward the confluence 18 as illustrated in FIG. 6. At this time, since in the second embodiment the end portion of each vertical blocking rib piece 20 that is located on the downstream side is tucked in the outer flow channel 17, each stream of the intermediate layer resin b resulting from the segmentation by the vertical blocking rib pieces 20 flows under the guidance of adjacent vertical blocking rib pieces 20 even after joining with the main resin c flowing along the outer flow channel 17. This allows the stream of the segmented intermediate layer resin b to flow into the confluence 18 in a stable manner, and accordingly, at the joining flow channel 19, there is formed the multi-layer molten resin fluid having an intended lamination configuration further including the main resin a flowing along the inner flow channel 15. Additionally, when the vertical blocking rib piece 20 is tucked in the outer flow channel 17 to too much of an extent, the vertical blocking rib piece 20 will interrupt flow of the molten resins. Accordingly, as illustrated in FIG. 6, a height difference h between the inner circumferential end 13a of the middle ring mandrel 13 and the inner circumferential end 20e of the vertical blocking rib piece 20 is preferably set in the range approximately from 0.7 mm to 1.0 mm. Subsequently, similarly to the first embodiment, the multi-layer molten resin fluid is injected and filled into a cavity of the mold which is not illustrated, and thus, the preform is molded.

(34) The injection molding device according to the present disclosure is not limited to the above embodiments and may include many variations. For example, although in the above embodiments the vertical blocking rib pieces 20 are disposed in the tapered portion of the inner ring mandrel 12, the vertical blocking rib pieces 20 may be further extended toward the upstream side even to the cylindrical outer circumferential surface of the inner ring mandrel 12.

(35) Furthermore, as illustrated in FIG. 7, the end portion of each vertical blocking rib piece 20 that is located on the downstream side may be tucked only in the inner flow channel 15, not in the outer flow channel 17 as illustrated in FIG. 6. In more detail, as illustrated in FIGS. 8 and 9, the inner circumferential end 20e of the vertical blocking rib piece 20 may extend to a position located on the inner side of an opening edge 12a of the inner ring mandrel 12 in the radial direction. That is to say, the downstream side end portion of the vertical blocking rib piece 20 that extends from the opening edge 12a of the inner ring mandrel 12 to the inner circumferential end 20e of the vertical blocking rib piece 20 may be tucked in the inner flow channel 15. This structure allows each stream of the intermediate layer resin b to flow under the guidance of adjacent vertical blocking rib pieces 20 even after joining with the main resin a flowing along the inner flow channel 15. Accordingly, at the joining flow channel 19, there is formed the multi-layer molten resin fluid having an intended lamination configuration further including the main resin c flowing along the outer flow channel 17. Moreover, the end portion of each vertical blocking rib piece 20 that is located on the downstream side may be tucked in both the outer flow channel 17 and the inner flow channel 15, by combining the structures of FIGS. 6 and 7. It is to be noted, however, that the inner ring mandrel 12 of FIGS. 2 to 4 is superior in terms of strength because the vertical blocking rib piece 20 in the present embodiment is located on the inner side of the opening edge 12a of the inner ring mandrel 12 in the radial direction.

(36) In the injection molding devices according to the first and second embodiments, the inner ring mandrel 12 may be coated with a repellency-enhancing film. Although the middle flow channel 16 is segmented into the narrow flow sub-channels by the vertical blocking rib pieces 20, use of the film prevents built-up of the molten resin in the flow channel, thereby reducing occurrence of resin burning effectively. Preferred examples of the repellency-enhancing film include a titanium nitride (TiN) film and a NiP/PTFE film containing nickel phosphide (NiP) and polytetrafluoroethylene (PTFE). Especially, a TiN film is superior in terms of durability due to its higher hardness compared with a NiP/PTFE film. As a base material of the inner ring mandrel 12, stainless is preferably used. Although the middle flow channel 16, having been narrowed by the vertical blocking rib pieces 20, is subject to high pressure while the molten resin flows therein, stainless provides excellent durability due to its high hardness.

EXAMPLES

(37) The same inner ring mandrels as the inner ring mandrel illustrated in FIGS. 2 to 4, except for that the films were changed, were prepared. The prepared inner mandrels were each assembled to the injection molding device of FIG. 1. Then, a relation between the film of the inner ring mandrel and resin burning was studied by letting the resin build up in the nozzle section included in the injection molding device. Stainless (SUS304) was used as the base material of the inner ring mandrel. A PET resin was used as the main resin, and MX nylon (MXD-6 manufactured by Mitsubishi Gas Chemical Co., Inc.) was used as the intermediate layer resin. After the temperature in the nozzle section was set in the range from 270 C. to 280 C. and after the resin built up for one hour, a predetermined amount of the resin built-up was ejected (purged). Subsequently, a preform was molded while the intermediate layer and the vertical connecting zones were observed. Then, assessment was conducted on the preforms molded as above and a control preform which included the intermediate layer and the vertical connecting zones which were properly formed. Table 1 shows results of the assessment, together with variations of the film used in the inner ring mandrels.

(38) TABLE-US-00001 TABLE 1 Film of inner ring mandrel Condition of intermediate layer and vertical connecting zones included in preform No film Unsatisfactory Hard chrome film Moderately satisfactory TiN film Satisfactory NiP/PTFE film Satisfactory Satisfactory: No deformation (e.g., reduction in thickness, presence of missing part) is observed (the result being equivalent to that of the control preform) Moderately satisfactory: Deformation is obsrved (although the extent of deformation is limited) Unsatisfactory: Deformation is observed (and the extent of deformation is large)

(39) After molding of each preform, the nozzle section was disassembled to observe the inner ring mandrel. A foreign substance, which appeared to be the carbonized resin, was found adhered between adjacent vertical blocking rib pieces (i.e., flow sub-channels of the intermediate layer resin) both in the inner mandrel that is not coated with a film and the inner ring mandrel coated with the hard chrome film. On the other hand, no such foreign substance was found adhered in the inner ring mandrel coated with the TiN film and the inner ring mandrel coated with the NiP/PTFE film. Thus, the inner ring mandrel coated with the TiN film and the inner ring mandrel coated with the NiP/PTFE film are considered to be capable of preventing occurrence of carbonization of the resin, or, capable, even when carbonization of the resin occurs, of allowing the carbonized resin to be eliminated by ejection (purging). The results of observation of the inner ring mandrels and the results shown in Table 1 clearly indicate that, with use of the inner ring mandrel coated with the TiN film and the inner ring mandrel coated with the NiP/PTFE film, the intermediate layer and the vertical connecting zones may be formed into desired shapes and dimensions.

(40) Additionally, a repellency-enhancing film may be applied not only to the inner ring mandrel but also to the middle ring mandrel and the outer ring mandrel. Especially, applying a film to the middle ring mandrel, which forms the middle flow channel between itself and the inner ring mandrel, will facilitate flow of the intermediate layer resin, and accordingly, it is better ensured that deformation of the intermediate layer due to occurrence of resin burning will be prevented.

(41) Furthermore, although in the above embodiments the nozzle section is configured to form a preform having a lamination configuration including the three layers made of the two different types of resins, a preform having any different lamination configuration, including four layers made of the two different types of resins, and four layers made of three different types of resins, may be formed by providing the nozzle section with an additional flow channel as needed. Moreover, the number of the vertical blocking rib pieces 20 may be changed appropriately in accordance with a desired number of the vertical connecting zones, and only a single and not a plurality of vertical blocking rib piece may also be disposed. Moreover, the first embodiment and the second embodiment may be combined.

INDUSTRIAL APPLICABILITY

(42) The injection molding device according to the present disclosure allows formation of the intermediate layer having a desired shape and dimension even when preform injection molding is conducted successively. Accordingly, preforms of excellent quality are molded, and moreover, production efficiency is improved because of reduced clogging in the nozzle section.

REFERENCE SIGNS LIST

(43) 1 nozzle section

(44) 2 hot runner block

(45) 11 shut-off pin

(46) 12 inner ring mandrel

(47) 12a opening edge

(48) 13 middle ring mandrel

(49) 13a inner circumferential end

(50) 14 outer ring mandrel

(51) 15 inner flow channel

(52) 16 middle flow channel

(53) 17 outer flow channel

(54) 18 confluence

(55) 19 joining flow channel

(56) 20 vertical blocking rib piece

(57) 20a side wall

(58) 20b side wall's upstream portion

(59) 20c side wall's downstream portion

(60) 20d outer wall portion

(61) 20e inner circumferential end

(62) 21 introduction channel

(63) 22, 23 manifold

(64) 24 introduction channel

(65) 25 manifold

(66) 26 supply port

(67) 27 hot runner

(68) 28 supply port

(69) 29 hot runner

(70) 30 check valve

(71) A resin supply unit

(72) B resin supply unit

(73) a flow of main rein in inner flow channel

(74) b flow of intermediate layer rein in middle flow channel

(75) c flow of main rein in outer flow channel

(76) h height difference between inner circumferential end of middle ring mandrel and inner circumferential end of vertical blocking rib piece

(77) s side clearance

(78) 101 preform

(79) 102 neck

(80) 103 neck ring

(81) 105 body

(82) 106 bottom

(83) 111 substrate layer

(84) 111a outer layer

(85) 111b inner layer

(86) 113 intermediate layer

(87) 114 vertical connecting zone

(88) 201 bottle

(89) 202 neck

(90) 203 neck ring

(91) 204 shoulder

(92) 205 body

(93) 206 bottom

(94) 211 substrate layer

(95) 211a outer layer

(96) 211b inner layer

(97) 213 intermediate layer

(98) 214 vertical connecting zone

(99) 301 mold

(100) 311 nozzle section

(101) 315 inner flow channel

(102) 316 middle flow channel

(103) 316R vertical blocking rib piece

(104) 317 outer flow channel

(105) 318 confluence

(106) 319 joining flow channel

(107) 320 shut-off pin

(108) 324c inner ring mandrel

(109) 324d middle ring mandrel

(110) 324e outer ring mandrel