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WO2019230551A1 - Buse de soufflage destinée à être utilisée dans un dispositif de moulage par soufflage, procédé de moulage par soufflage utilisant ladite buse de soufflage et tige d'étirage - Google Patents

Buse de soufflage destinée à être utilisée dans un dispositif de moulage par soufflage, procédé de moulage par soufflage utilisant ladite buse de soufflage et tige d'étirage Download PDF

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Publication number
WO2019230551A1
WO2019230551A1 PCT/JP2019/020439 JP2019020439W WO2019230551A1 WO 2019230551 A1 WO2019230551 A1 WO 2019230551A1 JP 2019020439 W JP2019020439 W JP 2019020439W WO 2019230551 A1 WO2019230551 A1 WO 2019230551A1
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WO
WIPO (PCT)
Prior art keywords
blow
nozzle
preform
rod
port
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/020439
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English (en)
Japanese (ja)
Inventor
土屋　要一
清典 島田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissei ASB Machine Co Ltd
Original Assignee
Nissei ASB Machine Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissei ASB Machine Co Ltd filed Critical Nissei ASB Machine Co Ltd
Priority to JP2020522138A priority Critical patent/JP7256798B2/ja
Publication of WO2019230551A1 publication Critical patent/WO2019230551A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/12—Stretching rods

Definitions

  • the present invention relates to a blow nozzle provided with a stretch rod for use in a blow molding apparatus using at least a liquid, a blow molding method using the blow nozzle, and a stretch rod used in the blow nozzle.
  • a blow nozzle that stretches a preform with a stretching rod when forming the preform using at least a liquid is known.
  • the liquid remaining in the blow nozzle can fall into the heated preform of the next cycle before the liquid is injected even when the drawing rod is retracted.
  • the temperature of the location where the liquid has dropped falls, there may be a problem in forming the container.
  • the liquid dropped from the blow nozzle adheres to the transport part, when the liquid falls from the transport part to the preform, the same container forming problem is caused.
  • the blow nozzle described in the following Patent Document 1 includes a telescopic rod (28) that at least partially forms a preformed container, a first position that prevents injection of pressurized liquid into the preformed container, and pressurization A sealing rod (50) that moves between a second position allowing liquid to be injected.
  • a telescopic rod (28) that at least partially forms a preformed container
  • a first position that prevents injection of pressurized liquid into the preformed container
  • pressurization A sealing rod (50) that moves between a second position allowing liquid to be injected.
  • the blow nozzle described in Patent Document 1 has a complicated mechanism because the forming expansion / contraction rod and the sealing rod are separate members.
  • the present invention has been made in view of the above facts, and in a blow nozzle that stretches a preform with a stretching rod, the residual liquid in the blow nozzle is prevented from dropping onto the preform or the parts of the blow molding apparatus with a simple configuration.
  • the purpose is to do.
  • a blow nozzle includes a nozzle body and an extending rod inserted through the nozzle body, and the nozzle body can be adapted to the mouth of the preform.
  • a nozzle tip provided at the tip of the nozzle, an injection port formed at the nozzle tip, a port for introducing a fluid containing at least a liquid into the nozzle body, and the port and the injection port communicating with each other
  • the lid includes a closing portion, which closes the injection port when the extending rod is in the retracted position, and closes the injection port when the extending rod moves to the more protruding position. It is configured to release the
  • the extending rod includes a linear rod body inserted into the blow nozzle, and the closing portion is a large-diameter portion of the rod body that fits an inner peripheral wall of the nozzle body that defines the fluid passage.
  • the large-diameter portion includes a seal portion at an outer peripheral portion that engages with the inner peripheral wall.
  • the fluid is a mixture of liquid and air, and the mixture can be introduced through the port.
  • the port comprises a first port into which liquid is introduced and a second port into which air is introduced, and the fluid passage contains a fluid which is a mixture of the introduced liquid and air. You may make it flow.
  • Another aspect of the present invention is a method for blow-molding a preform using the blow nozzle configured as described above, wherein the preform with the temperature adjusted is set in a blow cavity mold, and the mouth of the preform
  • the nozzle tip of the blow nozzle in a state in which the closing part is closed is adapted to move the drawing rod toward the bottom of the blow cavity mold and introduce fluid into the nozzle body.
  • the preform is stretched by a stretching rod and the preform is stretched by a fluid sprayed from the opened injection port. After the stretched preform has been formed by the blow cavity mold, the stretching rod is Each process is closed by moving the blow cavity mold away from the bottom of the blow cavity mold.
  • the method further includes the step of separating the blow nozzle from the blow cavity mold and the molded product in a state where the spray port is closed by the step of closing the spray port. More preferably, the step of separating the blow nozzle from the step of setting the preform to a blow cavity mold is repeatedly executed for the preform of the next cycle.
  • the blow cavity mold includes at least two blow split molds
  • the step of setting the preform to the blow cavity mold includes a step of closing the blow split mold
  • the tip of the stretching rod is in contact with the bottom of the preform before the closure is closed or before the closure is released.
  • a drawing rod for a blow nozzle that blows a fluid containing at least a liquid and blow-molds a preform.
  • the draw rod When the draw rod is inserted through the blow nozzle, the draw rod is provided.
  • a rod body formed linearly so as to be reciprocally movable with respect to the nozzle, and a closing portion formed in the rod body, wherein the extending rod is retracted into the blow nozzle And the closing portion that closes the injection port of the blow nozzle at a predetermined position.
  • the preferable closed portion is a large-diameter portion formed so as to be fitted to the inner peripheral wall of the nozzle body in the vicinity of the injection port.
  • FIG. 1 is a schematic view of a blow nozzle according to an embodiment of the present invention, showing a state in which an injection port of the blow nozzle is closed.
  • FIG. 2 is a schematic view of a blow nozzle according to an embodiment of the present invention, showing a state in which an injection port of the blow nozzle is opened.
  • FIG. 3 is a schematic diagram showing a pre-process of a process of blow-molding a preform using a blow nozzle according to an embodiment of the present invention, wherein (A) is a preform carrying-in process, and (B) is , Each showing a blow split mold closing.
  • FIG. 1 is a schematic view of a blow nozzle according to an embodiment of the present invention, showing a state in which an injection port of the blow nozzle is closed.
  • FIG. 2 is a schematic view of a blow nozzle according to an embodiment of the present invention, showing a state in which an injection port of the blow nozzle is opened.
  • FIG. 3 is a schematic diagram showing
  • FIG. 4 is a schematic view showing a process of blow molding a preform using a blow nozzle according to an embodiment of the present invention, where (A) is before blow molding, (B) is during blow molding, (C ) Shows the state when blow molding is completed.
  • 5A and 5B are schematic diagrams showing a post-process of the process shown in FIG. 4, where (A) is when the stretching rod is pulled up, (B) is when the injection port is closed, and (C) is when the blow nozzle is pulled apart. Each state is shown below.
  • FIG. 6 is a schematic diagram illustrating a configuration example of a fluid supply unit that supplies pressurized fluid to the blow nozzle according to the present embodiment.
  • FIG. 7 is a perspective view of a rotary conveyance type blow molding machine in which a blow molding apparatus for performing blow molding using a blow nozzle according to an embodiment of the present invention is incorporated.
  • FIG. 8 is a flowchart showing a process of blow-molding a preform using the blow nozzle according to the embodiment of the present invention.
  • FIG. 9 is a flowchart showing more detailed steps of the vertical axis stretching and the horizontal axis stretching of the preform in the flowchart of FIG. It is the schematic which shows the extending
  • FIG. 1 shows a blow nozzle 1 according to a first embodiment of the present invention.
  • the blow nozzle 1 is for use in a blow molding apparatus for blow-molding a preform, and the nozzle body 2 and the nozzle body are capable of reciprocating in the axial direction with respect to the nozzle body 2. 2 and a stretching rod 3 attached to 2.
  • the extending rod 3 is attached to the nozzle body 2 so as to be reciprocally movable in the axial direction with respect to the nozzle body 2 as shown by an arrow A by a driving means (motor or the like) not shown.
  • the nozzle body 2 includes a nozzle tip 4 provided at the tip of the nozzle body 2 so as to be adaptable to the mouth of the preform, an ejection port 5 formed in the nozzle tip 4, and a fluid containing at least a liquid. 2 and a fluid passage 7 formed in the nozzle body 2 so that the port 6 and the injection port 5 communicate with each other.
  • the extending rod 3 includes a linear rod body and a closing portion 10 formed in the vicinity of the tip 9 of the rod body.
  • the closing part 10 is a large-diameter part formed so as to be fitted to the inner peripheral wall 12 in the vicinity of the injection port 5, and is configured to have a larger radius than the rod body.
  • the linear rod body of the extending rod 3 penetrates the through hole 11 of the nozzle body 2 so as to be slidable and liquid-tight, and further passes through a section of the fluid passage 7 leading to the injection port 5. doing.
  • the outer peripheral wall of the closing portion 10 is slidably and liquid-tightly engaged with the inner peripheral wall 12.
  • the extending rod 3 is inserted through the nozzle body 2 so as to be reciprocally movable in the axial direction with respect to the nozzle body 2 as indicated by an arrow A, and a predetermined length of the extending rod 3 with respect to the nozzle body 2 shown in FIG.
  • the closing part 10 closes the injection port 5 in a liquid-tight manner.
  • a groove is formed in the outer peripheral wall of the closing portion 10 along the circumferential direction, for example.
  • a seal member such as an O-ring may be disposed in the groove.
  • a groove is formed in the inner peripheral wall of the through hole 11 along the circumferential direction, for example.
  • a sealing member such as an O-ring may be disposed in the groove.
  • the fluid supply unit 13 that supplies the pressurized fluid to the blow nozzle 1 is connected to the port 6 via the supply path 14. Therefore, in the state shown in FIG. 2, when the fluid is supplied from the fluid supply unit 13 to the port 6 through the supply path 14, the supplied fluid passes through the gap 8 of the fluid passage 7 and passes through the ejection port 5. As shown by the arrow B, it is injected to the outside.
  • the fluid supply unit 13 includes an on-off valve WV1, and whether or not the pressurized fluid is supplied to the blow nozzle 1 by the opening and closing operation of the on-off valve WV1, and thus in the open state shown in FIG. Whether or not the fluid is ejected from the mouth 5 is controlled.
  • fluid is put in the gap 8 of the nozzle body 2. May be stored in advance, and an operation may be performed in which the fluid is introduced into the preform simultaneously with the movement of the stretching rod 3 (at the same time as opening the ejection port 5). That is, the opening / closing part 10 of the stretching rod 3 may be used instead of the fluid opening / closing valve.
  • the fluid used for blow molding in this embodiment is a liquid or a mixture of liquid and gas.
  • An example of a preferred liquid is water, and an example of a preferred gas is air (compressed air).
  • the fluid supply unit 13 is supplied with liquid and gas, and the fluid supply unit 13 introduces the mixture of liquid and gas into the port 6.
  • FIG. 6 shows a configuration example of the fluid supply unit 13 that introduces a pressurized fluid, which is a mixture of water and compressed air, into the blow nozzle 1.
  • the fluid supply unit 13 includes a water supply source 60, a water supply circuit 62 for sending out water supplied from the water supply source 60, a storage unit 64 (such as a hose or a tank) that stores a predetermined amount of water from the water supply circuit 62, A high-pressure gas source 66 such as a compressor; an air supply circuit 68 for sending compressed air supplied from the high-pressure gas source 66 to the storage unit 64; and an air generation unit 70 for causing the high-pressure gas source 66 to generate compressed air; And an exhaust circuit 72 for exhausting excess air from the storage section 64 and the like, and a vacuum pump 74 and a vacuum suction circuit 76 for vacuuming the inside of the blow nozzle 1 through the supply path 14. Yes.
  • the fluid supply unit 13 controls the supply of the pressurized fluid sent from the storage unit 64 to the supply path 14 and controls the supply of compressed air from the on-off valve WV1 and the supply circuit 68 to the storage unit 64.
  • the fluid supply unit 13 may supply the liquid and the gas separately to the blow nozzle 1.
  • the port 6 includes a first port through which liquid is introduced and a second port through which air is introduced, and the liquid and gas introduced into the first and second ports respectively merge.
  • the fluid that is a mixture of liquid and air flows through the fluid passage 7.
  • the preform to be blow-molded by the blow nozzle 1 is molded through four main steps in, for example, a rotary conveyance type blow molding machine 200 shown in FIG. These four processes are an injection molding process, a temperature control process, a blow molding process, and a take-out process.
  • a rotary conveyance type blow molding machine 200 an injection molding station 202, a temperature control station 204, a blow molding station 206, and a take-out station 208 are executed in each of the four regions divided into a 360 ° conveyance region. Is provided.
  • the injection molding station 202 molds a plurality of preforms 50 by injecting a resin material (for example, a resin made of PET, PE, or PP) from an injection device (not shown) into the injection mold 210 (injection process).
  • a resin material for example, a resin made of PET, PE, or PP
  • the plurality of preforms 50 that have been injection-molded are transported to the temperature control station 204 by a transport means (not shown) (not shown) with the mouth held by the transport plate 212.
  • temperature adjustment is performed before the blow molding so that the preform 50 has a proper molding temperature (temperature control step). This temperature adjustment step is performed, for example, by placing the preform 50 in the heating pot 214 and inserting the temperature adjustment core 216 into the preform 50.
  • the temperature-adjusted preform 50 is transported to the blow molding station 206 by transport means (not shown).
  • the preform 50 is loaded into the blow cavity mold 100, and the above-described fluid is introduced into the preform 50 using the blow nozzle 1 according to the present embodiment.
  • the reform 50 is blow-molded into a molded product 52.
  • the blow-molded molded product 52 is transported to the take-out station 208 by a transport means (not shown).
  • the molded product 52 is taken out from the rotary conveyance type blow molding machine 200 by take-out means (not shown) (take-out process).
  • the temperature-adjusted preform 50 is carried into a blow molding station (206 in FIG. 7) (step 300). As shown in FIG. 3A, the preform 50 is disposed between the blow split molds 100A and 100B that are spaced apart from each other. At this time, the blow nozzle 1 is disposed above the preform 50 in a state where the injection port 5 is closed by the closing portion 10.
  • the blow split molds 100A and 100B are closed (step 301). Thereby, the setting of the preform 50 to the blow cavity mold 100 is completed. As shown in FIG. 3B, the closed blow molds are integrally formed with a blow cavity mold 100, and the mouth portion 55 of the preform 50 is formed in the upper opening 101 of the blow cavity mold 100. Installed. An inner surface of the blow cavity mold 100 forms a molding surface 102.
  • the blow nozzle 1 is lowered, and the nozzle tip portion 4 of the blow nozzle 1 is fitted to the mouth portion 55 of the preform, specifically, fitted to the inner wall surface of the mouth portion 55 (step 302).
  • the blow split molds 100A and 100B may be closed after the nozzle tip 4 of the blow nozzle 1 is fitted to the mouth 55 of the preform 50.
  • the state of FIG. 4A is a state where preparation for blow molding is completed.
  • step 304 in FIG. 8 blow molding is performed by vertical and horizontal axis stretching of the preform.
  • the extending rod 3 is lowered, the closing of the injection port 5 by the closing part 5 is released, and a pressurized fluid containing liquid and gas is introduced into the port 6. .
  • the preform 51 being molded is stretched mainly in the vertical axis by the stretching rod 3 and in the horizontal axis by the pressurized fluid.
  • the movement of the stretching rod 3 is stopped, the introduction of the fluid to the port 6 is stopped, and the blow molding is completed (step 306 in FIG. 8).
  • the molded product 52 (hollow container) is finally molded by the molding surface 102.
  • step 308 After completion of blow molding, the stretching rod 3 is moved away from the bottom of the blow cavity mold 100 (step 308 in FIG. 8). The state of step 308 is shown in FIG.
  • step 310 the closing portion 10 liquid-tightly closes the inner peripheral wall 12 in the vicinity of the injection port 5 of the nozzle body 2 (step 310 in FIG. 8). At this time, the movement of the stretching rod 3 is stopped.
  • the state of step 310 is shown in FIG.
  • step 312 in FIG. 8
  • the state of step 312 is shown in FIG.
  • the blown molds 100A and 100B that have been connected are pulled apart, and the state shown in FIG. 3 (A) is ready to receive the preform for the next cycle.
  • the molded product 52 is taken out from the blow cavity mold 100 (step 314) and conveyed to the take-out station 208 shown in FIG. 7 (step 316 in FIG. 8). At the take-out station 208, the molded product 208 is taken out as a product.
  • a preform for the next cycle is prepared (step 318 in FIG. 8), the process returns to step 300, and the above-described processing is repeated in the cycle.
  • Preparation of the preform for the next cycle is performed by injection of the preform at the injection station 202 in FIG. 7 and reheating (temperature adjustment) of the preform at the temperature control station 204, and may be performed simultaneously with Step 314 and Step 316. Good.
  • the reciprocating operation of the stretching rod 3 can be performed with a very simple configuration in which the closing portion 10 is provided on the stretching rod 3 for preform stretching.
  • the opening and closing operation of the injection port 5 became possible along with the stretching of the preform.
  • the blow nozzle 1 according to the first embodiment even if the liquid used for blow molding in the previous cycle remains in the fluid passage 7, the remaining liquid remains in FIG. From the state of FIG. 3B to the state of FIG. 4A through the state of FIG. 3B, there is no risk of falling on the temperature-adjusted preform of the next cycle, and molding defects can be prevented in advance. Can do.
  • the residual liquid is likely to fall.
  • the residual liquid is also dropped onto the preform in this case. This can be surely prevented.
  • the residual liquid can be prevented from dropping onto the preform even before the state immediately before molding shown in FIG. 4A.
  • the residual liquid of the blow nozzle 1 may fall on the conveyance parts, molds, etc. of the rotary conveyance type blow molding machine 200. There is no longer a risk that the liquid will fall into the preform via the parts.
  • the closing portion 10 is formed in the vicinity of the distal end 7 of the stretching rod 3, that is, in a place other than the distal end 7, the distal end has an optimum shape when the distal end 7 is brought into contact with the bottom of the preform 50.
  • Seven shapes can be selected.
  • the shape of the tip 7 can be a rounded shape with no corners so that pressure is not concentrated.
  • step 304 in FIG. 8 will be described using the flowchart in FIG.
  • step 304 in FIG. 8 is started from the state of FIG. 4A by moving (lowering) the stretching rod 3 toward the bottom of the blow cavity mold 100 (step 400). ).
  • the stretching rod 3 descends, the closed injection port 5 is opened (step 401). Further, as shown in FIG. 4B, the descending stretching rod 3 reaches the bottom of the preform 50 and stretches the preform 50 in the vertical axis (step 402).
  • a fluid is introduced into the nozzle body 2 through the port 6 (step 403), the fluid is ejected from the injection port 5 (step 404), and the preform is stretched in the horizontal axis by the fluid (step 408).
  • the injected fluid extends the preform not only in the horizontal axis direction but also in the vertical axis direction, and the vertical axis stretching is mainly performed by the stretching rod 3.
  • the preform 51 thus stretched is molded by the molding surface 102 of the blow cavity mold 100 (step 404). As shown in FIG. 4B, it will be understood that the stretched preform 51 reaches the molding surface 102 where it is molded.
  • the vertical axis stretching in step 402 and the horizontal axis stretching in step 408 are performed first in order to prevent misalignment of the bottom of the final container, and in the case where the vertical axis stretching is performed first (preliminary stretching), the wall thickness distribution of the container is adjusted. This is because it is easy to mold. However, in a thick container that contains cosmetics and the like that do not undergo much longitudinal stretching, or a small container that contains pharmaceuticals, etc., longitudinal stretching and transverse stretching may be performed simultaneously, or horizontal stretching may be performed first. It is thought that it can also be performed.
  • the operation when the fluid supply unit 13 shown in FIG. 6 is used for introducing the fluid into the blow nozzle 1 in Step 403 of FIG. 9 is as follows. That is, the water supply valve WV3 is opened with the on-off valve WV1, the air supply valve WV2 and the vacuum suction valve WV5 closed and the air vent valve WV4 is opened, and a predetermined amount of liquid is stored in the storage unit 64. Next, after the liquid storage is completed, the water supply valve WV3 and the air vent valve WV4 are closed. The air supply valve WV2 is opened and the liquid is pressurized with compressed air. When the reservoir 64 reaches a predetermined pressure, the on-off valve WV1 is opened, and a mixture (pressure medium) composed of liquid and gas is introduced into the blow nozzle 1 via the supply path 14 and the port 6, and the preform 50 Perform blow molding.
  • a mixture pressure medium
  • the air supply valve WV2 is closed and the air vent valve WV4 is opened to exhaust excess gas on the circuit of the molded product 52 (container) and the fluid supply unit 13. Then, the inside of the molded product 52 (container) is depressurized (another exhaust valve may be installed near the blow nozzle).
  • the on-off valve WV1 is closed.
  • the extending rod 3 is raised, and the injection port 5 is closed in a liquid-tight state by the closing portion 10 (steps 308 and 310 in FIG. 8, states in FIGS. 5A and 5B).
  • the blow nozzle 1 is raised (state shown in FIG. 5C). At this time, the vacuum suction valve WV5 is opened, and the residual liquid in the nozzle body is removed. After removing the residual liquid, the molded product is taken out and the suction valve WV5 is closed.
  • the liquid (water) is pushed out by the pressure applied to the gas (compressed air), so that the preform 50 can be blown with both gas and liquid and pressurized.
  • the pressure of the medium mixture can be controlled based on the gas pressure. That is, the preform can be blow-molded without using an apparatus for directly applying pressure to the liquid, and the system can be simplified.
  • the incompressible fluid (liquid) is superior to the compressible fluid (gas), and improvement in formability and moldability can be expected.
  • this makes it possible to blow the preform into a desired shape even using a low-pressure gas. Therefore, the mechanism for generating compressed air, that is, the air generating unit 70 can be simplified, and the existing air The generation unit can be diverted.
  • FIG. 10 shows a blow nozzle 1b according to a second embodiment of the present invention. Note that the same constituent elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the tip 9 of the stretching rod 3 was not in contact with the bottom of the preform 50 in the state before blow molding in FIG. For this reason, in the first embodiment, there is a state in which the end of the stretching rod 3 is not in contact with the bottom of the preform even after the stretching rod 3 starts to descend and the closing of the injection port 5 is released.
  • the tip 9b of the stretching rod 3b is at the bottom of the preform 50 before blow molding, that is, in a state where the closing portion 10b closes the injection port 5.
  • the closing portion 10b is formed at a position relatively away from the tip 9b so as to come into contact. Therefore, the longitudinal extension (preliminary stretching) of the preform 50 can be performed simultaneously with the start of the lowering of the stretching rod 3b.
  • the vertical axis stretching preliminary stretching
  • the residual liquid is preformed from the injection port 5 during the preliminary stretching. There is no risk of falling to 50, and the preliminary stretching can proceed without any problems.
  • the tip 9b of the stretching rod 3b is not in contact with the bottom of the preform in the state before blow molding corresponding to FIG. 4A, and the closing of the injection port 5 by the closing portion 10b is not performed.
  • the closing portion 10b may be formed at a position relatively away from the tip 9b so that the tip 9b contacts the preform 50 when the stretching rod 3b is lowered to a position immediately before being released.
  • the closing portion 10b of this modification is farther from the tip than the closing portion 10 of the first embodiment, but is closer to the tip than the closing portion 10b shown in FIG. Even in such a modification, it is possible to eliminate the possibility that the residual liquid falls from the ejection port 5 to the preform 50 during the preliminary stretching.
  • the preform 50 to be molded by the blow nozzle 1 of the present invention is not limited to the preform injection-molded at the injection molding station 202, but may be a primary blow-molded product obtained by performing primary blow molding of the preform. good. That is, the blow cavity mold 100 shown in FIG. 3 to FIG. 5 may be a secondary blow cavity mold, and the present invention is applied when blow molding a secondary blow molded product (molded product) from a primary blow molded product. You may apply.
  • the nozzle tip 4 is adapted to fit into the mouth of the preform in addition to the mode shown in FIGS. 3 to 5 where the nozzle tip 4 is directly inserted into the mouth of the preform 50.
  • a mode is also included in which the blow nozzle 1 is held in a state where the injection port 5 of the nozzle tip 4 is aligned with the opening of the mouth of the preform 50 through a typical member.
  • blow cavity mold 100 is not limited to the examples of FIGS. 3 to 5, but in addition to the blow cavity split molds 100 ⁇ / b> A and 100 ⁇ / b> B, the neck part or the bottom part of the preform 50 is molded and held.
  • a mold may be used.
  • the closing portions 10 and 10b are formed as large-diameter portions of the rod body.
  • the closing portion is naturally inserted into the fluid passage 7 as well.
  • a mode of covering the outer peripheral wall of the nozzle body around the injection port is also conceivable.

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  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

L'objectif de la présente invention est de prévenir que du liquide résiduel dans une buse de soufflage ne chute. Une buse de soufflage 1 est pourvue d'un corps de buse 2 et d'une tige d'étirage 3 apte à effectuer un mouvement de va-et-vient dans une direction axiale par rapport au corps de buse : le corps de buse 2 étant pourvu d'une partie d'extrémité de pointe de buse 4 conformable à une partie d'embouchure d'une préforme, d'une ouverture d'injection 5 de la partie d'extrémité de pointe de buse 4, d'un orifice 6 pour introduire un fluide comprenant au moins un liquide dans le corps de buse et d'un passage de fluide 7 assurant la communication entre l'orifice 6 et l'ouverture d'injection 5 ; la tige d'étirage 3 passant à travers un segment du passage de fluide 7 s'étendant vers l'ouverture d'injection 5 et un espace 8 à travers lequel le fluide peut passer étant formé entre la tige d'étirage 3 et une paroi circonférentielle interne 12 du corps de buse 2, délimitant le premier segment du passage de fluide 7 ; une partie de fermeture pour fermer l'ouverture d'injection lorsque la tige d'étirage est dans une position prescrite par rapport au corps de buse étant formée dans la tige d'étirage 3 ; et, lorsque la tige d'étirage 3 est déplacée à partir de la position prescrite dans une direction telle qu'une extrémité distale de la tige d'étirage 3 dépasse davantage de l'ouverture d'injection 5, l'ouverture d'injection 5 étant ouverte.
PCT/JP2019/020439 2018-05-31 2019-05-23 Buse de soufflage destinée à être utilisée dans un dispositif de moulage par soufflage, procédé de moulage par soufflage utilisant ladite buse de soufflage et tige d'étirage Ceased WO2019230551A1 (fr)

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JP2020522138A JP7256798B2 (ja) 2018-05-31 2019-05-23 ブロー成形装置で使用するためのブローノズル、該ブローノズルを用いたブロー成形方法及び延伸ロッド

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WO2021221628A1 (fr) * 2020-04-29 2021-11-04 Amcor Rigid Packaging Usa, Llc Broche d'étanchéité pour tête de formage et de remplissage de récipient
WO2022030128A1 (fr) * 2020-08-05 2022-02-10 株式会社フロンティア Procédé de fabrication de récipient en résine

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JP2011506130A (ja) * 2007-12-06 2011-03-03 アムコー リミテッド 液体または液圧ブロー成形
JP2015506288A (ja) * 2011-12-21 2015-03-02 アムコー リミテッド 成形装置のシールシステム
JP2016532573A (ja) * 2013-10-10 2016-10-20 ディスクマ アクチェンゲゼルシャフト 液体体積を供与する方法及び関連装置
WO2017078772A1 (fr) * 2015-11-03 2017-05-11 Discma Ag Tête de formage pourvue d'une goupille de fixation/tige d'élongation intégrée et présentant diverses géométries d'étanchéité
WO2018079012A1 (fr) * 2016-10-28 2018-05-03 株式会社吉野工業所 Procédé de moulage par soufflage de liquide

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JP2011506130A (ja) * 2007-12-06 2011-03-03 アムコー リミテッド 液体または液圧ブロー成形
JP2015506288A (ja) * 2011-12-21 2015-03-02 アムコー リミテッド 成形装置のシールシステム
JP2016532573A (ja) * 2013-10-10 2016-10-20 ディスクマ アクチェンゲゼルシャフト 液体体積を供与する方法及び関連装置
WO2017078772A1 (fr) * 2015-11-03 2017-05-11 Discma Ag Tête de formage pourvue d'une goupille de fixation/tige d'élongation intégrée et présentant diverses géométries d'étanchéité
WO2018079012A1 (fr) * 2016-10-28 2018-05-03 株式会社吉野工業所 Procédé de moulage par soufflage de liquide

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Publication number Priority date Publication date Assignee Title
WO2021221628A1 (fr) * 2020-04-29 2021-11-04 Amcor Rigid Packaging Usa, Llc Broche d'étanchéité pour tête de formage et de remplissage de récipient
WO2022030128A1 (fr) * 2020-08-05 2022-02-10 株式会社フロンティア Procédé de fabrication de récipient en résine

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