WO2019163889A1 - Procédé de fabrication de récipient en résine et dispositif de moulage par soufflage - Google Patents

Procédé de fabrication de récipient en résine et dispositif de moulage par soufflage Download PDF

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Publication number
WO2019163889A1
WO2019163889A1 PCT/JP2019/006549 JP2019006549W WO2019163889A1 WO 2019163889 A1 WO2019163889 A1 WO 2019163889A1 JP 2019006549 W JP2019006549 W JP 2019006549W WO 2019163889 A1 WO2019163889 A1 WO 2019163889A1
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WIPO (PCT)
Prior art keywords
liquid
preform
gas
container
blow molding
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Application number
PCT/JP2019/006549
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English (en)
Japanese (ja)
Inventor
土屋　要一
Original Assignee
日精エー・エス・ビー機械株式会社
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Priority to JP2020501031A priority Critical patent/JP7220194B2/ja
Publication of WO2019163889A1 publication Critical patent/WO2019163889A1/fr

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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
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • 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
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding

Definitions

  • the present invention relates to a method for manufacturing a resin container and a blow molding apparatus.
  • Patent Document 1 discloses a blow molding method using compressed air.
  • Patent Document 2 a method has been devised in which a liquid filling a container is used as a pressure medium and a blow molding process and a filling process are performed in a single step (Patent Document 2).
  • blow molding using compressed air high-pressure air compressed by a compressor is blown into the preform in order to make the preform into a desired container shape.
  • the pressure of compressed air and its control are insufficient, or if sufficient blow time is not secured, the preform-to-container shaping is insufficient due to the shrinkage of the container that occurs after molding.
  • the thickness distribution of the container is not appropriate, and uneven portions (ribs, patterns, stamps, letters, etc.) on the surface of the container are not clear.
  • a molding defect defective appearance
  • unevenness of elongation such as a tear pattern or a ring pattern
  • the compressed air has a lower thermal conductivity than the liquid, and even if the compressed air comes into contact with the inner wall surface of the preform having an uneven temperature, the uneven temperature is maintained without being reduced. Only the hot region of the preform is locally stretched with compressed air to initially contact the mold, and the blown preform is cooled unevenly. This causes a poor appearance such as a tear pattern or a ring pattern. In order to prevent such appearance defects from occurring, it is necessary to optimally adjust the molding conditions such as the temperature distribution of the preform and the introduction timing of the compressed air, which is difficult.
  • the present invention provides a resin container manufacturing method that is excellent in formability, can suppress appearance defects (molding defects) that occur when blowing with compressed gas, and can shorten the time of the blowing process, and An object is to provide a blow molding apparatus.
  • the method for producing the resin container of the present invention capable of solving the above problems is as follows.
  • the manufacturing method it is easy to form the preform into a desired container shape by blowing the gas and a liquid having a volume smaller than the filling capacity of the container into the preform. Time can be shortened.
  • the manufacturing method of the resin container of the present invention is as follows.
  • the gas and the liquid are introduced into the preform from a blow nozzle connected to a supply path for supplying the gas and the liquid,
  • the supply path is provided with a storage area for the gas, It is preferable that pressure is applied to the liquid so that the liquid blows the preform together with the gas via the storage region.
  • the preform can be blown with gas and liquid by the pressure applied to the liquid.
  • the pressure reference of the pressurized medium is a liquid that has been made high pressure by a pump or the like, it is possible to reduce the specification requirements of the compressor that compresses the gas. That is, the type of the compressor may be either a low pressure type or a high pressure type.
  • the manufacturing method of the resin container of the present invention is as follows.
  • the gas and the liquid are introduced into the preform from a blow nozzle connected to a supply path for supplying the gas and the liquid,
  • the supply path is provided with a storage area for the liquid, It is preferable that pressure is applied to the gas so that the gas blows the preform together with the gas via the storage region.
  • the preform can be blown with gas and liquid by the pressure applied to the gas, and the container can be blow-molded without using an apparatus for applying pressure to the liquid.
  • the preform can be blown into a container having a desired shape regardless of whether a high-pressure or low-pressure gas is used, and the apparatus can be simplified.
  • the manufacturing method of the resin container of the present invention is as follows.
  • the gas and the liquid are introduced into the preform from a blow nozzle connected to a supply path for supplying the gas and the liquid by applying pressure to the gas and the liquid, and blow the preform. And preferred.
  • the preform can be blown with the gas and the liquid by the pressure applied to the gas and the pressure applied to the liquid, and the pressure related to the blow molding conditions of the preform can be finely controlled.
  • pressure is applied to the liquid and the gas, it is possible to blow the preform into a container having a desired shape without applying high pressure to the gas, which is employed in normal blow molding.
  • the pressurization medium introduced into the preform is a mixture of liquid and gas, and a synergistic effect can be expected as compared with the case of only liquid or gas.
  • the blow molding apparatus of the present invention capable of solving the above-described problems is An injection molding unit for producing a bottomed preform made of resin; A blow molding unit for producing a container by blow molding a preform produced by the injection molding unit, The blow molding unit is A mold in which the preform is disposed; A reservoir for storing liquid; and A supply path for supplying the compressed gas and the liquid into the preform disposed in the mold; A control unit for controlling the supply pressure of at least one of the compressed gas and the liquid supplied into the preform via the supply path for blow molding;
  • the preform can be blown with the compressed gas and the liquid by including the storage portion in which the liquid is stored and the supply path for supplying the compressed gas and the liquid.
  • the control unit that controls the supply pressure of at least one of the compressed gas and the liquid, the compressed gas and the liquid can be blown into the preform by applying pressure to at least one of the compressed gas and the liquid.
  • the blow molding apparatus of the present invention further includes a generation unit capable of generating the compressed gas, In the supply path, the liquid is stored at a position closer to the preform than the compressed gas, It is preferable that the control unit is capable of adjusting a blow pressure of the liquid supplied into the preform by controlling a supply pressure of the compressed gas.
  • the preform can be blown with gas and liquid by the pressure applied to the gas, and the container can be blow-molded without using a device for applying pressure to the liquid.
  • the preform can be blown into a container having a desired shape even when a low-pressure gas is used, and the compressed gas generation unit can be simplified.
  • a resin container that has excellent shapeability, can suppress appearance defects (molding defects) that occur when blowing with compressed gas, and can shorten the time of the blowing process.
  • a method and blow molding apparatus can be provided.
  • FIG. 5 is a schematic view showing a state of blow molding in the first to third embodiments in which a container is manufactured from a preform in a blow molding unit. It is a schematic diagram which shows the mode of the blow molding of 1st Embodiment which manufactures a container from the preform in a blow molding unit. It is a schematic diagram which shows the mode of the blow molding of 1st Embodiment which manufactures a container from the preform in a blow molding unit. It is a schematic diagram which shows the mode of the blow molding of 1st Embodiment which manufactures a container from the preform in a blow molding unit.
  • FIG. 1 is a block diagram of the blow molding apparatus 20.
  • the blow molding apparatus 20 includes an injection molding unit 22 for manufacturing the preform 12.
  • An injection device 24 that supplies a resin material that is a raw material is connected to the injection molding unit 22.
  • the blow molding apparatus 20 includes a blow molding unit 200 for blowing the preform 12 to manufacture the container 10. That is, the blow molding apparatus 20 includes at least an injection molding unit 22 and a blow molding unit 200 as molding stations.
  • the blow molding apparatus 20 may further include, as an additional molding station, a temperature adjustment unit that adjusts the temperature distribution of the preform 12 before blow molding and a take-out unit that discharges the container 10 to the outside of the apparatus.
  • the configuration of the blow molding apparatus 20 is (1) an injection molding unit 22 and a blow molding unit 200, (2) an injection molding unit 22, a blow molding unit 200 and a take-out unit, and (3) an injection unit 22 and a temperature control unit.
  • the blow molding unit 200 may be any one of the four patterns of the injection molding unit 22, the temperature control unit, the blow molding unit 200, and the take-out unit (each unit of these patterns is in the order of the molding process (FIG. 1). Usually in the order of the arrow direction).
  • the injection molding unit 22 and the blow molding unit 200 are provided at positions rotated by a predetermined angle (180 degrees in the present embodiment (pattern (1))) around the conveying means 28.
  • the conveying means is constituted by a rotating plate or the like so that the preform 12 or the container 10 in which the neck portion is supported by the neck type attached to the rotating plate is conveyed along with the rotation of the rotating plate. It is configured.
  • each unit is usually arranged at a position rotated 120 degrees around the conveying means 28, and at the position rotated at 90 degrees around the conveying means 28 in the pattern (4). Is done.
  • the bottomed preform 12 is manufactured by pouring a resin material from the injection device 24 into a preform-shaped space formed by clamping these molds.
  • the blow molding unit 200 is configured to manufacture the container 10 by blow molding the preform 12 manufactured by the injection molding unit 22. Although not essential, when a temperature adjustment unit is provided, the preform 12 is subjected to a temperature adjustment process before being conveyed to the blow molding unit 200. Here, the blow molding unit 200 will be described in detail with reference to FIGS.
  • FIGS. 2 to 6 are schematic views showing a state of blow molding for producing the container 10 from the preform 12 in the blow molding unit 200.
  • the blow molding unit 200 includes a mold 202 which is a split mold in which the preform 12 is disposed, a stretching rod 204 for stretching the preform 12 disposed at the time of blowing, and a liquid 30 as a pressurizing medium.
  • a controller 210 configured by a processor for controlling the supply pressure of at least one of the compressed gas and the liquid 30 supplied to the liquid.
  • the function of the processor can be realized by a general-purpose microprocessor that operates in cooperation with a general-purpose memory.
  • a general-purpose microprocessor a CPU, an MPU, and a GPU can be exemplified.
  • the general-purpose memory ROM and RAM can be exemplified.
  • the function of the processor may be realized by a dedicated integrated circuit such as a microcontroller, ASIC, or FPGA.
  • the processor may be realized by a combination of a general-purpose microprocessor and a dedicated integrated circuit.
  • the blow molding unit 200 includes a generation unit 212 such as a compressor that can generate compressed gas, and a liquid supply unit 214 such as a hydraulic pump that can supply the liquid 30.
  • the control unit 210 is connected to the generation unit 212 and the liquid supply unit 214.
  • the generation unit 212 and the liquid supply unit 214 are connected to the supply path 208, and the supply pressure of at least one of the compressed gas and the liquid 30 is controlled by the control unit 210.
  • the control unit 210 supplies at least one of the generation unit 212 and the liquid supply unit 214 based on an operation signal input by an operator to an input interface such as an operation panel provided in the blow molding apparatus 20.
  • the process for controlling the pressure may be repeatedly executed.
  • the reservoir 206 is provided in the middle of the supply path 208 and is configured to be partitioned by a plurality of valves (four in FIGS. 2 to 6).
  • the first valve 220A is for adjusting the supply of the liquid 30 from the liquid supply unit 214 to the storage unit 206 by opening and closing.
  • the 2nd valve 220B is for adjusting supply of the gas from the production
  • the third valve 220 ⁇ / b> C is for releasing the pressure of the storage unit 206 when the liquid 30 is supplied to the storage unit 206.
  • the fourth valve 220D is for adjusting the supply of the liquid 30 and compressed gas from the reservoir 206 to the preform 12 by opening and closing.
  • a part of the supply path 208 (hereinafter referred to as a nozzle supply path 216) disposed at a position close to the mold 202 when the fourth valve 220 ⁇ / b> D is used as a reference is connected to the blow nozzle 218.
  • the nozzle supply path 216 includes a fifth valve 220E that is an exhaust valve.
  • the container 10 includes a blowing process in which the preform 12 manufactured by the injection molding unit 22 is blown with both gas and liquid 30 to form the container 10, and the liquid 30 remaining inside the container 10 is drained. And a waste liquid process.
  • FIG. 2 is a view showing a state in which the preform 12 is arranged in the mold 202 of the blow molding unit 200, the stretching rod 204 is arranged inside the preform 12, and the liquid 30 is stored in the storage unit 206.
  • the preform 12 is manufactured by the injection molding unit 22 shown in FIG. 1, and is placed on the mold 202 of the blow molding unit 200 by the conveying means 28. After the preform 12 is placed on the mold 202, the stretch rod 204 is placed so as to contact the bottom of the preform 12.
  • the liquid 30 is supplied from the liquid supply unit 214 to the storage unit 206.
  • the first valve 220A is opened to introduce the liquid 30 into the reservoir 206, and the third valve 220C is opened as necessary to depressurize the reservoir 206.
  • the first valve 220A and the third valve 220C are closed.
  • the blow molding unit 200 is in the state shown in FIG.
  • the liquid 30 stored in the storage unit 206 becomes a pressurized medium of the preform 12.
  • the liquid 30 stored in the storage unit 206 is less than the filling capacity or the full capacity of the container 10 to be manufactured.
  • the amount of the liquid 30 stored in the storage unit 206 is about 1/5 to 4/5, preferably 1/3 to 3/4, more preferably about 1/2 of the filling capacity or full capacity of the container 10. It is good to be set to. The same applies to the following embodiments.
  • the second valve 220B is opened, and the compressed gas generated by applying pressure in the generation unit 212 by the control unit 210 is supplied to the storage unit 206.
  • the fourth valve 220D is opened to store the storage unit 206.
  • the liquid 30 and the compressed gas supplied from the generator 212 are supplied to the preform 12 (FIG. 3).
  • the gas present in the nozzle supply path 216 is also entrained and supplied to the preform 12.
  • the preform 12 is stretched by extending the stretching rod 204 toward the bottom of the mold 202 (FIG. 4).
  • the liquid 30 and the compressed gas are introduced into the preform 12 from the blow nozzle 218, and the preform 12 starts to be blown (shaped) (FIG.
  • the liquid 30 inside the manufactured container 10 is discarded (waste liquid process).
  • the waste liquid is discharged by removing the blow nozzle 218 from the container 10 and opening the mold 202 and then removing the container 10 from the blow molding unit 200 by the conveying means 28.
  • the waste liquid may be performed by the blow molding apparatus 20 or may be performed after taking out from the blow molding apparatus 20.
  • the container 10 which does not contain a filling is obtained by the above blow process and waste liquid process.
  • the preform 12 can be blown with the gas and the liquid 30 by the pressure applied to the gas (the pressure of the pressurized medium containing the gas and the liquid 30 is based on the pressure of the compressed gas). Can be controlled as).
  • the pressure of the compressed gas generated at a high pressure in the generating unit 212 is preferably set in the range of 1.0 MPa to 3.5 MPa, and the maximum pressure at the time of final shaping of the container 10 is at least 3.0 MPa or more. It is desirable to set so that The pressure of the liquid supplied from the liquid supply unit is preferably set in the range of 1.0 MPa to 5.0 MPa, and the maximum pressure at the time of final shaping of the container 10 is set to be at least 2.5 MPa or more. It is desirable (but only in the case of an embodiment in which the pressure reference of the pressurized medium is controlled by liquid). These pressure conditions are the same in the following embodiments.
  • the preform 12 is blown using the gas (compressible fluid) and the liquid 30 (incompressible fluid) in an amount smaller than the filling capacity or the full capacity of the container 10.
  • the preform 12 is blown to the shape of the container 10 in a short time because the blow molding with the liquid 30 having the property of incompressibility different from the gas is excellent in the shapeability of the container 10. Is possible.
  • the formability is excellent, even the container 10 having a complicated shape can be blow-molded in a short time.
  • the cooling proceeds before the preform 12 comes into contact with the inner wall of the mold 202 of the blow molding unit 200.
  • the cooling time in the blowing process is shortened.
  • the process can be shortened.
  • the cooling time can be suitably shortened.
  • the preform 12 is cooled more uniformly than when only gas is used, and molding defects such as uneven elongation due to uneven temperature of the preform 12 can be suitably prevented and reduced.
  • the liquid 30 of the present embodiment is only one of the pressure media for blowing and is not a filling material. It seems that many restrictions and disadvantages still exist in blow molding with a filler. For example, the types of packing that can be used as a pressurizing medium are limited, a mechanism that appropriately controls the amount and pressure of the packing, a mechanism that keeps the filling area clean (sterile), and nozzle-preform As a result of the necessity to mount many mechanisms controlled with high accuracy, such as a mechanism for exhausting the gas remaining between them, in the blow molding machine, the apparatus cost is greatly increased. In general, the optimum blow molding conditions are obtained as a result of many trials and errors. However, when blowing with a filler, the filler may be wasted at this time.
  • the liquid 30 used in this embodiment is not a filling liquid, there are many types that can be used, and an inexpensive liquid that can be discarded after use can also be used.
  • the blow molding apparatus 20 only needs to basically incorporate the hydraulic circuit mechanism into the conventional pneumatic circuit mechanism, and the cost does not increase so much. That is, it is possible to achieve the blow molding apparatus 20 and the molding method capable of improving the shapeability and shortening the blow time without making many modifications to the conventional blow molding using compressed air as a pressurized medium.
  • the temperature-controlled liquid 30 it is desirable to use the temperature-controlled liquid 30 because it is necessary to appropriately cool the preform 12 from the inside.
  • cooling water whose temperature is controlled to 10 to 30 ° C. and pressurized (tower water or chiller water usually used in blow molding machines) can be used.
  • the cooling water may contain a bactericide (hydrogen peroxide, hypochlorous acid, peracetic acid, etc.) or a cleaning agent (various rinsers, etc.). Absent.
  • a liquid alcohol, various organic solvents, etc.
  • having low metal corrosivity may be used.
  • the ratio of the gas and the liquid 30 used as the pressurizing medium may be appropriately changed to an optimal ratio in consideration of the temperature of the preform 12, the shape of the container 10, the stretch ratio, and the like.
  • the liquid 30 to be used is smaller than the filling capacity of the container 10 (the total volume of the compressed air and the liquid 30 existing inside the container 10 before disposal is the filling capacity of the container 10 or full filling. It is discarded after blow molding.
  • the method of forming the preform 12 in the shape of the container 10 with the liquid 30 filled in the container 10 it is difficult to control the filling amount of the liquid 30, but any amount satisfying the desired formability in the manufacturing method of the present embodiment Liquids can be used in amounts that do not require complex control.
  • the container 10 is blow-molded without using an apparatus for applying pressure to the liquid 30. Can do. Further, since the liquid 30 having excellent formability is used, the preform 12 can be blown into the container 10 having a desired shape regardless of whether the gas is high pressure or low pressure, and the apparatus can be simplified.
  • molding apparatus of this embodiment has both the compressed gas and the liquid 30 by having the storage part 206 in which the liquid 30 was stored, and the supply path 208 for supplying compressed gas and the liquid 30.
  • the preform 12 can be blown. Thereby, it becomes easy to shape the preform 12 into the desired shape of the container 10, and the time for the blowing process can be shortened.
  • a control unit 210 that controls the supply pressure of at least one of the compressed gas and the liquid 30, the compressed gas and the liquid 30 are introduced into the preform 12 by applying pressure to at least one of the compressed gas and the liquid 30. Blow molding can be performed.
  • the preform may be designed to be arranged in the mold with the neck portion of the preform facing vertically downward. This configuration is preferable because the liquid remaining in the container can be drained smoothly.
  • the preform 12 can be blown with the gas and the liquid 30 by the pressure applied to the gas (the pressure of the pressurizing medium is controlled based on the air pressure).
  • the container 10 can be blow molded without using an apparatus for applying pressure to the liquid 30.
  • the preform 12 can be blown into the container 10 having a desired shape even when a low-pressure gas is used, and the compressed gas generation unit 212 can be simplified.
  • the preform 12 is disposed in the mold 202 of the blow molding unit 200, the stretching rod 204 is disposed inside the preform 12, and the storage portion 206.
  • the liquid 30 is stored in (FIG. 2).
  • the first valve 220A is opened, the control unit 210 applies pressure to the liquid by the liquid supply unit 214 to supply the liquid 30 to the storage unit 206, and the fourth valve 220D is opened and the liquid 30 in the reservoir 206 is supplied to the preform 12.
  • the gas present in the nozzle supply path 216 is also entrained and supplied to the preform 12.
  • the nozzle supply path 216 in this case corresponds to a gas storage area.
  • the preform 12 is stretched by extending the stretching rod 204 toward the bottom of the mold 202.
  • the liquid 30 and gas are blown from the blow nozzle 218 to the preform 12 to shape the preform 12, and by supplying a predetermined amount of the liquid 30, the preform 12 is shaped into the container 10.
  • the fifth valve 220E is opened to release the gas in the container 10. A blow process is implemented by said flow.
  • the preform 12 can be blown with the gas and the liquid 30 by the pressure applied to the liquid 30 (the pressure of the pressure medium including the gas and the liquid 30 is the hydraulic pressure). Can be controlled on the basis).
  • the pressure reference of the pressurized medium is the liquid 30 that has been pressurized by a pump or the like, the specification requirements of the compressor that compresses the gas can be relaxed, and the container 10 can be used regardless of whether the compressor is a low pressure type or a high pressure type. Blow molding can be suitably performed.
  • the preform 12 is disposed in the mold 202 of the blow molding unit 200, the stretching rod 204 is disposed inside the preform 12, and the storage portion 206.
  • the liquid 30 is stored in (FIG. 2).
  • the first valve 220A is opened, the control unit 210 applies pressure to the liquid 30 by the liquid supply unit 214, and supplies the liquid 30 to the storage unit 206.
  • the valve 220B is opened, and the compressed gas generated by applying pressure in the generation unit 212 by the control unit 210 is supplied to the storage unit 206.
  • the fourth valve 220D is opened to generate the liquid 30 in the storage unit 206.
  • the compressed gas supplied from the unit 212 is supplied to the preform 12.
  • the gas present in the nozzle supply path 216 is also entrained and supplied to the preform 12.
  • the nozzle supply path 216 in this case corresponds to a gas storage area.
  • the preform 12 is stretched by extending the stretching rod 204 toward the bottom of the mold 202.
  • the liquid 30 and gas are blown from the blow nozzle 218 to the preform 12 to form the preform 12, and a predetermined amount of the liquid 30 and compressed gas are supplied to the container 10 of the preform 12 into the container 10.
  • the shaping is completed and the first valve 220A and the fourth valve 220D are closed.
  • the fifth valve 220E is opened to release the gas in the container 10.
  • a blow process is implemented by said flow.
  • the gas and the liquid 30 can be blown to the preform 12 by the pressure applied to the gas and the pressure applied to the liquid 30, and the pressure applied to the preform 12 is fine. Control is possible.
  • the preform 12 can be blown into the container 10 having a desired shape without applying high pressure to the gas, which is employed in normal blow molding.
  • the preform 12 is disposed in the mold 202 of the blow molding unit 200, the stretching rod 204 is disposed inside the preform 12, and the compressed gas is stored in the storage unit 206 (FIG. 9). ).
  • the mode in which the liquid 30 is stored in the storage unit 206 has been described.
  • compressed gas is stored.
  • the preform and the stretching rod are arranged according to the same procedure as in the first embodiment.
  • the compressed air is supplied from the generation unit 212 to the storage unit 206.
  • the second valve 220B is opened to introduce compressed gas into the reservoir 206
  • the third valve 220C is opened as necessary to depressurize the reservoir 206.
  • the blow molding unit 200 When a predetermined amount of compressed gas is introduced, the second valve 220B and the third valve 220C are closed. As a result, the blow molding unit 200 is in the state shown in FIG. Here, the compressed gas stored in the storage unit 206 becomes a pressurized medium of the preform 12.
  • the first valve 220A is opened, the control unit 210 applies pressure to the liquid by the liquid supply unit 214, and supplies the liquid 30 to the storage unit 206.
  • 220D is opened and the compressed gas of the storage part 206 is supplied to the preform 12.
  • the gas present in the nozzle supply path 216 is also entrained and supplied to the preform 12.
  • the nozzle supply path 216 in this case corresponds to a gas storage area.
  • the storage unit 206 corresponds to a compressed gas storage region.
  • the preform 12 is stretched by extending the stretching rod 204 toward the bottom of the mold 202.
  • the liquid 30 and gas are blown from the blow nozzle 218 to the preform 12 to shape the preform 12, and by supplying a predetermined amount of the liquid 30, the preform 12 is shaped into the container 10.
  • the fifth valve 220E is opened to release the gas in the container 10. A blow process is implemented by said flow.
  • the preform 12 can be blown with the gas and the liquid 30 by the pressure applied to the liquid 30 (the pressure of the pressurized medium including the gas and the liquid 30 is based on the liquid pressure). Can be controlled as). Also in this embodiment, by blowing gas and liquid into the preform, it becomes easy to shape the preform into a desired container shape, and the time for the blowing process can be shortened.
  • the preform 12 is first arranged in the mold 202 of the blow molding unit 200, the stretching rod 204 is arranged inside the preform 12, and the liquid 30 and the compressed gas are stored in the storage unit 206.
  • Both the liquid 30 and the compressed gas stored in the storage unit 206 are collectively referred to as a mixed fluid 40 in this embodiment.
  • the mode in which the liquid 30 is stored in the storage unit 206 has been described.
  • the mixed fluid 40 is stored.
  • the preform and the stretching rod are arranged according to the same procedure as in the first embodiment.
  • the liquid 30 is supplied from the liquid supply unit 214 to the storage unit 206.
  • the first valve 220 ⁇ / b> A is opened to introduce the liquid 30 into the storage unit 206.
  • the compressed air is supplied from the generation unit 212 to the storage unit 206.
  • the second valve 220 ⁇ / b> B is opened to introduce the compressed gas into the storage unit 206.
  • the third valve 220C is opened and the reservoir 206 is depressurized.
  • the first valve 220A and the second valve 220B are closed.
  • the blow molding unit 200 is in the state shown in FIG.
  • the mixed fluid 40 stored in the storage unit 206 includes the compressed gas and the liquid 30 and serves as a pressurized medium for the preform 12.
  • the first valve 220A is opened, the control unit 210 applies the pressure to the liquid 30 by the liquid supply unit 214, and supplies the liquid 30 to the storage unit 206.
  • the valve 220B is opened, and the compressed gas generated by applying pressure in the generation unit 212 by the control unit 210 is supplied to the storage unit 206.
  • the fourth valve 220D is opened and the mixed fluid 40 in the storage unit 206 is supplied. Supply to preform 12.
  • the gas present in the nozzle supply path 216 is also entrained and supplied to the preform 12.
  • the nozzle supply path 216 in this case corresponds to a gas storage area.
  • the storage unit 206 corresponds to a storage region for the liquid 30 and the compressed gas.
  • the preform 12 is stretched by extending the stretching rod 204 toward the bottom of the mold 202.
  • the liquid 30 and the compressed gas are blown from the blow nozzle 218 to the preform 12 to form the preform 12, and a predetermined amount of the liquid 30 and the compressed gas are supplied to the container 10 of the preform 12.
  • the first valve 220A, the second valve 220B, and the fourth valve 220D are closed.
  • the fifth valve 220E is opened to release the gas in the container 10.
  • a blow process is implemented by said flow.
  • the mixed fluid 40 may be, for example, a pressurized medium in which an appropriate amount of liquid is dispersed in a gas (a pressurized medium in which the liquid is dispersed in a spray form in the gas). In this case, since the amount of liquid remaining in the blown container is very small, a method of simply drying with air may be employed in the waste liquid process.
  • FIG. 13 is a schematic diagram showing an outline of a blow molding unit 1200 according to the sixth embodiment. Since the configuration of the blow molding apparatus other than the blow molding unit 1200 is the same as that of the first embodiment, description thereof is omitted.
  • the blow molding unit 1200 includes a liquid supply unit 1214, a generation unit 1212 that generates compressed gas, a storage unit 1206, a mold unit 1250, and a control unit (not shown).
  • the liquid supply unit 1214 includes a liquid source 1260 such as a hydraulic pump, and a supply piston 1240 that holds the liquid 1030 therein.
  • the supply piston 1240 includes a rod 1242 that applies pressure to the internal liquid 1030 and a stopper 1244 that stops the rod 1242 at a predetermined position.
  • generates compressed gas is comprised with the compressor.
  • the storage unit 1206 is a tank that stores the liquid 1030 having a volume smaller than the container filling amount of the container to be molded.
  • the mold unit 1250 includes a mold that defines the outer shape of the container, a blow nozzle, and the like.
  • the control unit (not shown) is connected to the generation unit 1212 and the liquid supply unit 1214 and is configured to control the supply pressure of at least one of the compressed gas and the liquid 1030.
  • the container is formed by blowing a preform produced by the injection molding unit 22 (see FIG. 1) with both a gas and a liquid 1030 to mold the container, and a waste liquid process for draining the liquid 1030 remaining inside the container. , Manufactured through. Since the waste liquid process is the same as that of the first embodiment, the description is omitted.
  • the liquid 1030 for example, water
  • the rod 1242 is extended (lowered) to a position where it abuts against the stopper 1244. Confirm.
  • the liquid amount is supplied to the storage unit 1206, and the compressed gas created by the generating unit 1212 is introduced therein, whereby the liquid 1030 and the compressed gas are flowed into the preform and blown.
  • the blowing process is performed. Since the liquid used in each blow process is always controlled and managed in the same amount, the molding conditions between the blow batches can be made uniform. Note that the pressure of the pressurizing medium can be controlled based on the air pressure.
  • FIG. 14 is a schematic diagram showing an outline of a blow molding unit 2200 according to the seventh embodiment. Since the configuration of the blow molding apparatus other than the blow molding unit 2200 is the same as that of the first embodiment, description thereof is omitted.
  • the blow molding unit 2200 includes a liquid supply unit 2214, a generation unit 1212 that generates compressed gas, a merging unit 2206, a mold unit 1250, and a control unit (not shown).
  • the liquid supply unit 2214 includes a liquid source 1260 such as a hydraulic pump, and a supply piston 2240 that holds the liquid 2030 therein.
  • the supply piston 2240 includes a rod 2242 that applies pressure to the internal liquid 1030 and a motor 2246 connected to the rod 2242.
  • the junction 2206 is a location where the high-pressure gas circuit 2208A through which the compressed gas flows and the liquid circuit 2208B through which the liquid 2030 flows join.
  • a suitable amount of liquid 1030 for example, water
  • the liquid 1030 and compressed gas for example, air
  • the amount of liquid to be ejected is controlled so that the stroke (extension distance) of the rod 2242 is adjusted by the motor 2246 and always has the same mixing ratio.
  • the motor 2246 is controlled so as to be pushed above the gas pressure so as not to lose the gas pressure of the high-pressure gas circuit 2208A.
  • the blowing process is performed. Note that the pressure of the pressurizing medium can be controlled based on the air pressure. Further, since the liquid 30 is used in a complete mist form, the amount of the liquid 30 used can be reduced as compared with the first to seventh embodiments.
  • the blow molding apparatus 20 described in the above embodiment is an aspect having the injection molding unit 22 and the blow molding units 200, 1200, and 2200.
  • the temperature of the preform 12 is adjusted before blowing. You may have the taking-out part for taking out the temperature control part, the manufactured container 10, etc.
  • the preform 12 is shaped by sharing the gas and the liquids 30, 1030, and 2030 in the blowing process, and thus the desired container 10 is formed.
  • the container can be suitably manufactured even in an aspect in which the temperature control part is not provided.
  • the aspect of the supply path 208 is arbitrary if it can achieve this invention, and is not limited.
  • control unit 210 may be configured as a separate control unit connected to each of the generation unit 212 and the liquid supply unit 214. Further, according to each of the first to fifth embodiments, it is possible to include only a single control unit connected to at least one of the generation unit 212 and the liquid supply unit 214. Moreover, the said control part may be provided in a blow molding apparatus in places other than a blow molding unit.

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

Abstract

Dans ce procédé de fabrication d'un récipient en résine, un récipient en résine (10) est moulé à partir d'une préforme (12). Le procédé de fabrication comprend : une étape de soufflage pour souffler la préforme (12) à l'aide d'un gaz et d'un liquide (30), et ainsi mouler le récipient (10) ; et une étape de décharge de liquide pour décharger le liquide (30) restant dans le récipient (10). La quantité du liquide (30) utilisée dans l'étape de soufflage est inférieure à la capacité de remplissage du récipient (10).
PCT/JP2019/006549 2018-02-23 2019-02-21 Procédé de fabrication de récipient en résine et dispositif de moulage par soufflage WO2019163889A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016530131A (ja) * 2013-08-30 2016-09-29 ディスクマ アクチェンゲゼルシャフト 容器用高変性ポリエステル
WO2016174847A1 (fr) * 2015-04-30 2016-11-03 株式会社吉野工業所 Appareil de moulage par soufflage de liquide
JP2016210142A (ja) * 2015-05-12 2016-12-15 日精エー・エス・ビー機械株式会社 中空容器の製造方法及びブロー成形装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016530131A (ja) * 2013-08-30 2016-09-29 ディスクマ アクチェンゲゼルシャフト 容器用高変性ポリエステル
WO2016174847A1 (fr) * 2015-04-30 2016-11-03 株式会社吉野工業所 Appareil de moulage par soufflage de liquide
JP2016210142A (ja) * 2015-05-12 2016-12-15 日精エー・エス・ビー機械株式会社 中空容器の製造方法及びブロー成形装置

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