WO2017142043A1 - ブロー成形装置およびブロー成形方法 - Google Patents
ブロー成形装置およびブロー成形方法 Download PDFInfo
- Publication number
- WO2017142043A1 WO2017142043A1 PCT/JP2017/005781 JP2017005781W WO2017142043A1 WO 2017142043 A1 WO2017142043 A1 WO 2017142043A1 JP 2017005781 W JP2017005781 W JP 2017005781W WO 2017142043 A1 WO2017142043 A1 WO 2017142043A1
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- WIPO (PCT)
- Prior art keywords
- mold
- blow
- unit
- temperature
- preform
- Prior art date
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- 238000000071 blow moulding Methods 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 claims abstract description 60
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 230000008569 process Effects 0.000 claims abstract description 37
- 238000001746 injection moulding Methods 0.000 claims abstract description 33
- 238000007664 blowing Methods 0.000 claims abstract description 20
- 239000011347 resin Substances 0.000 claims abstract description 13
- 229920005989 resin Polymers 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 11
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 11
- 238000009826 distribution Methods 0.000 claims description 9
- 238000002425 crystallisation Methods 0.000 claims description 7
- 230000008025 crystallization Effects 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 5
- -1 polyethylene terephthalate Polymers 0.000 claims description 3
- 238000002347 injection Methods 0.000 abstract description 10
- 239000007924 injection Substances 0.000 abstract description 10
- 230000007246 mechanism Effects 0.000 description 22
- 230000006872 improvement Effects 0.000 description 11
- 239000002184 metal Substances 0.000 description 5
- 230000032258 transport Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007723 transport mechanism Effects 0.000 description 1
Images
Classifications
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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
- B29C49/28—Blow-moulding apparatus
- B29C49/28012—Blow-moulding apparatus using several moulds whereby at least one mould is different in at least one feature, e.g. size or shape
-
- 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
- B29C49/18—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using several blowing steps
-
- 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
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6409—Thermal conditioning of preforms
-
- 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
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6409—Thermal conditioning of preforms
- B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
-
- 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
- B29C49/78—Measuring, controlling or regulating
- B29C49/786—Temperature
-
- 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
-
- 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
- B29C49/48—Moulds
- B29C2049/4879—Moulds characterised by mould configurations
- B29C2049/4892—Mould halves consisting of an independent main and bottom part
-
- 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
- B29C2949/22—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at neck portion
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/03—Injection moulding apparatus
- B29C45/04—Injection moulding apparatus using movable moulds or mould halves
- B29C45/06—Injection moulding apparatus using movable moulds or mould halves mounted on a turntable, i.e. on a rotating support having a rotating axis parallel to the mould opening, closing or clamping direction
-
- 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
- B29C49/48—Moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/003—PET, i.e. poylethylene terephthalate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
Definitions
- the present invention relates to a blow molding apparatus and a blow molding method for molding a resin container.
- Blow molding apparatuses are roughly classified into a method called a cold parison method (also called a two-stage method) and a method called a hot parison method (also called a one-stage method).
- Patent Document 1 Currently, when manufacturing PET bottles with high heat resistance, a device employing a two-stage method is often used (see Patent Document 1).
- a two-stage apparatus an injection molding apparatus for manufacturing a preform and a blow molding apparatus are connected in an off-line state. For this reason, the preform manufactured by the injection molding apparatus is naturally cooled to room temperature once and stocked at a predetermined place, and then supplied to the blow molding apparatus.
- the above-mentioned two-stage apparatus can produce highly heat-resistant PET bottles, it is necessary to heat the preform to a suitable temperature for blowing after it has been naturally cooled once, so that the energy efficiency is low.
- the preform is not cooled to room temperature, so that energy efficiency is higher than that of the one-stage technique, but sufficient heat resistance performance is obtained as compared with the two-stage apparatus. I could not.
- an object of the present invention is to provide a blow molding apparatus and a blow molding method capable of achieving both improvement in energy efficiency and improvement in heat resistance.
- An injection molding unit for producing a bottomed preform made of resin A blow molding unit; A support for supporting the preform; A transport unit that transports the support part to the blow molding unit,
- the blow molding unit is A first mold for performing a first step of heat-treating the preform at a first temperature and an intermediate molded body blow-molded by the heat-treatment blow are blow-molded at a second temperature lower than the first temperature.
- the second mold for executing the second process for manufacturing the container, and the first mold for the support portion in order to continuously execute the first process and the second process.
- a moving unit capable of relatively moving the second mold.
- the preform manufactured by the injection molding unit is blown by heat treatment without being cooled to room temperature, energy for reheating the preform to an appropriate temperature for blowing is not required. For this reason, energy efficiency can be improved.
- the first mold and the second mold are separately provided, the first process for performing the heat treatment blow can be performed independently of the second process that is continuously performed next. it can.
- the first temperature used in the heat treatment blow in the first step can be set to a temperature higher than the second temperature used in the second step, for example, a temperature that promotes the crystallization of the resin. A container imparted with sex can be obtained.
- the first step and the second step can be continuously performed, and it is not necessary to perform a temperature adjustment process or the like for avoiding a temperature drop for the intermediate molded body, thereby improving energy efficiency. Can do.
- the mobile unit is A long and plate-like fixing part; A plate-like first movable part movable along the longitudinal direction of the fixed part on the fixed part; A plate-like second movable part movable on the first movable part in a direction perpendicular to the longitudinal direction; With The first mold and the second mold are preferably fixed on the second movable part.
- the blow molding device of the present invention is It is preferable that the position where the support portion supports the preform in the first step and the position where the support portion supports the intermediate formed body in the second step are the same.
- the first step of heat-treating the preform at the first temperature and the second step of manufacturing the container by blow-molding the intermediate molded body at the second temperature are performed separately and smoothly. be able to.
- the first mold has a first inner wall surface that defines a first space in which the preform is disposed
- the second mold has a second inner wall surface that defines a second space in which the intermediate molded body is disposed,
- the first space is preferably larger than the second space.
- the preform can be blow-molded in a larger size in consideration of the shrinkage after the heat treatment blow during the heat treatment blow. Therefore, the residual stress (strain caused by stretching orientation) remaining in the final molded product (container) can be reduced.
- the blow molding device of the present invention is A temperature control unit for performing a temperature control process for bringing the preform manufactured by the injection molding unit closer to an even temperature distribution;
- the blow molding unit preferably performs the heat treatment blow on the preform that has been subjected to the temperature control process by the temperature control unit.
- the temperature distribution on the preform may be biased due to the influence of heat during injection.
- the temperature control process is performed on the injection-molded preform and the heat treatment blow is performed on the preform after the temperature control process, the deviation that may occur on the intermediate molded body or the final container is generated.
- the temperature can be reduced and uneven thickness is less likely to occur. For this reason, more stable heat resistance can be obtained.
- the blow molding method of the present invention comprises: An injection molding process for injection molding a resin-made preform with a bottom; A first step of heat-treating the preform manufactured in the injection molding process at a first temperature using a first mold, and an intermediate molded body blow-molded by the heat treatment blow using a second mold A continuous blow step for continuously performing a second step of producing a container by blow molding at a second temperature lower than the first temperature, including.
- the first step of performing the heat treatment blow using the first mold is executed independently of the second step of using the second mold, and therefore is used in the heat treatment blow of the first step.
- the first temperature can be set to a temperature higher than the second temperature used in the second step, for example, a temperature that promotes crystallization of the resin, and a container with sufficient heat resistance can be obtained.
- the first step and the second step are continuously performed, it is not necessary to perform a temperature control process or the like for avoiding a temperature drop for the intermediate molded body, and energy efficiency can be improved. .
- the blow molding method which can make the improvement of energy efficiency and the improvement of heat resistance performance compatible can be provided.
- the blow molding method of the present invention comprises: After the injection molding step, including a temperature adjustment step of performing a temperature adjustment process to bring the preform manufactured in the injection molding step closer to an even temperature distribution, In the first step of the continuous blowing step, it is preferable that the heat treatment blow is performed on the preform that has been subjected to the temperature adjustment processing in the temperature adjustment step.
- the temperature distribution on the preform may be biased due to the influence of heat during injection.
- the injection-molded preform is subjected to the temperature adjustment process, and the heat-treated blow is performed to the preform after the temperature adjustment process.
- the temperature can be reduced and uneven thickness is less likely to occur. For this reason, more stable heat resistance can be obtained.
- the first temperature is preferably a temperature at which crystallization of polyethylene terephthalate is easily promoted.
- (A) is a block diagram of the blow molding apparatus which concerns on this invention
- (b) is a horizontal surface figure of (a). It is a perspective view explaining the structure of a blow molding unit.
- (A), (b) is a figure explaining the structure of a metal mold unit. It is the figure which looked at the blow molding unit of Drawing 2 from the front side. It is a figure explaining the fixing
- the front-rear direction is an example of a direction in which two mold units 210 and 220, which will be described later, slide on the guide rail.
- the left-right direction is an example of the moving direction of the mold when the first mold unit 210 and the second mold unit 220 described later open or close the mold.
- the up-down direction is an example of a direction in which a support portion 270 described later moves up and down.
- the name of each direction is defined by the direction of viewing the device from the operator (observer) when the device is installed on a horizontal plane, but the name of these directions is an example, and the scope of the invention is not limited. It is not limited.
- the blow molding apparatus 1 includes, on a base 11, an injection molding unit 10 for manufacturing a preform and a temperature control unit 15 for adjusting the temperature of the manufactured preform.
- the injection molding unit 10 is connected to an injection device 12 that supplies a resin that is a raw material of the container.
- the blow molding apparatus 1 includes a blow molding unit 20 for producing a container by double-blowing a preform and a take-out unit 25 for taking out the produced container on the base 11. .
- the blow molding apparatus 1 has a one-stage configuration as a whole.
- the injection molding unit 10, the temperature control unit 15, the blow molding unit 20, and the take-out unit 25 are provided at positions rotated by a predetermined angle (90 degrees in this example) about the transport unit (transport mechanism) 30.
- the transport unit 30 is composed of a rotating plate or the like, and four neck types are attached to the rotating plate.
- the container manufactured by the preform manufactured by the injection molding unit 10 or the blow molding unit 20 is supported by the neck mold, and is conveyed to each part as the rotating plate rotates.
- the rotating plate of this example is formed from four fan-shaped transfer plates, and the rotating plates arranged at the positions of the injection molding unit 10 and the blow molding unit 20 are configured to be able to be raised and lowered.
- the injection molding unit 10 includes an injection cavity mold, an injection core mold, and the like that are not shown.
- the injection molding unit 10 produces a bottomed cylindrical preform by pouring a resin material from the injection device 12 into a preform-shaped space formed by closing these molds. It is configured.
- the temperature control unit 15 is configured to adjust the temperature so that the temperature of the preform manufactured by the injection molding unit 10 approaches a uniform temperature distribution in the entire preform.
- the temperature control unit 15 is configured to adjust the temperature to a suitable temperature (for example, about 90 to 100 ° C.) for stretching and blowing the preform.
- a suitable temperature for example, about 90 to 100 ° C.
- the preform is placed in a temperature control pot, and a blow pressure is introduced from a temperature-controlled blow core mold fitted into the mouth of the preform.
- the preform is pre-blowed by the introduced blow pressure and brought into contact with the inner surface of the temperature control pot to adjust the preform to an appropriate temperature for blowing.
- the temperature of the preform may be adjusted in a non-contact state by heat generated from the temperature control (heating) core mold or the temperature control (heating) pot without performing preliminary blow.
- the blow molding unit 20 is configured to manufacture a resin container by continuously performing a heat treatment blow and a final blow described later on the preform whose temperature has been adjusted by the temperature control unit 15. .
- the blow molding unit 20 is provided with two independent mold units 210 and 220 configured to be movable in the front-rear direction in order to perform heat treatment blow and final blow.
- the take-out unit 25 is configured to open the neck portion of the container manufactured by the blow molding unit 20 from the neck mold and take out the container to the outside of the blow molding apparatus 1.
- blow molding unit 20 will be described in detail with reference to FIGS.
- the blow molding unit 20 includes a first mold unit 210 (an example of a first mold) and a second mold unit 220 (an example of a second mold) that are split molds. And a moving unit 240 that can move the first mold unit and the second mold unit, and is installed below a support portion 270 that supports a preform, an intermediate molded body, and the like.
- the support portion 270 is configured as a neck type.
- first mold unit 210 a plurality of first mold parts 211 (6 in this example) for blow-molding the preform 5 to blow-mold the intermediate molded body are provided.
- Heat treatment blow refers to primary blow with heat setting.
- second mold unit 220 as shown in FIG. 3 (b) there are a plurality of second mold parts 221 (six in this example) for finally blowing the intermediate molded body 6 to blow mold the container. ) Is provided.
- the final blow refers to a secondary blow that involves annealing and shaping to a final container shape.
- the first mold part 211 has a first space 212 defined by the first inner wall surface 213, and the preform 5 supported by the support part 270 is disposed in the first space 212.
- the second mold part 221 has a second space 222 defined by the second inner wall surface 223, and the intermediate molded body 6 supported by the support part 270 is disposed in the second space 222.
- the size of the first space 212 of the first mold part 211 is formed so as to have a volume (size) larger than or substantially equal to the second space 222 of the second mold part 221.
- the first inner wall surface 213 of the first mold part 211 is configured with a wall surface with less unevenness, and the second inner wall surface 223 of the second mold part 221 has unevenness for forming the outer peripheral wall of the container. It is made up of wall surfaces.
- the first mold unit 210 and the second mold unit 220 are provided with a heating device and a temperature control device (not shown), and the first mold unit 211 and the second mold unit 221 are respectively heated. It is configured to be adjustable.
- the temperature of the first inner wall surface 213 of the first mold part 211 is adjusted to a first temperature (for example, 170 to 190 ° C.) for heat-blowing the preform 5.
- the temperature of the second inner wall surface 223 of the second mold part 221 is adjusted to a second temperature (for example, 110 to 120 ° C.) for finally blowing the intermediate molded body 6.
- the first temperature is a temperature at which crystallization of a resin material (for example, polyethylene terephthalate) in a manufactured container is easily promoted in consideration of easiness of stretching of the resin and temperature decrease due to contact with the inner wall surface of the mold (
- the second temperature is set to be lower than the first temperature.
- a bottom mold 214 for the first mold part 211 is connected to the first mold unit 210 below one inner surface of the pair of first split mold fixing plates 211a.
- the bottom mold 224 for the second mold part 221 is connected to the lower side of one inner surface of the pair of second split mold fixing plates 221a.
- the bottom mold 214 is configured to be movable up and down relative to the first mold section 211, and the bottom mold 224 is configured to be moved up and down relative to the second mold section 221.
- the bottom molds 214 and 224 are integrated with the first split mold fixing plate 211a or the second split mold fixing plate 221a.
- the bottom molds 214 and 224 cannot be fixed in the normal state to the lifting device 280 (lifting rod) of the blow molding device 1 that drives the bottom molds 214 and 224 to move up and down. Therefore, the lower mold 214, 224 (or the bottom mold fixing plate 214c, 224c integrated with them) is lifted and lowered only when the first mold unit 210 and the second mold unit 220 are closed.
- a mechanism (connecting mechanism) that can be connected to H.280 is provided.
- the connection mechanism includes a shaft portion 214a that hangs down from the bottom mold 214 and a connection block 214b.
- the connection mechanism includes a shaft portion 224a that hangs down from the bottom mold 224 and a connection block 224b.
- the moving unit 240 includes a fixed portion 241 disposed at the lowermost portion, a first movable portion 242 disposed above the fixed portion 241, and a first portion disposed above the first movable portion. And two movable parts 243. Further, the moving unit 240 includes at least one motor (first drive mechanism, blow type slide moving mechanism) 244 for moving the first movable part 242 and a pair of hydraulic cylinders for moving the second movable part 243. (Second drive mechanism, one mold opening / closing mechanism (one mold clamping mechanism)) 245.
- FIG. 5 is a diagram showing the fixed portion 241 and the first movable portion 242 of the moving unit 240.
- the fixing portion 241 is formed of a long and plate-like member.
- Two guide rails 251A and 251B extending in the longitudinal direction (front-rear direction) of the fixing portion 241 are provided in parallel on the upper surface of the fixing portion 241.
- a plurality (four in this example) of blocks 252 are attached to the guide rails 251A and 251B so as to be movable along the guide rails 251A and 251B.
- a through hole 241 a is provided at the center position in the longitudinal direction (front-rear direction) of the fixing portion 241.
- the tip of the lifting device 280 protrudes so as to be connectable to the connecting mechanism of the bottom molds 214 and 224.
- the guide rails 251A and 251B may be directly laid on the upper surface of the base 11 so as to function as the fixing portion 241.
- the first movable part 242 is formed of a long plate-like member whose front and rear length is shorter than that of the fixed part 241, and the lower surface side is fixed to the upper part of each block 252.
- the first movable portion 242 is configured to move along the guide rails 251A and 251B together with the block 252 as the block 252 moves.
- a rod-shaped shaft portion 254 disposed along the guide rail 251 ⁇ / b> B is connected to the motor 244, and the shaft portion 254 rotates with the rotation of the motor 244.
- a connecting portion 255 is attached to the shaft portion 254, and the connecting portion 255 moves along the shaft portion 254 as the shaft portion 254 rotates.
- the connecting portion 255 is connected to the block 252 of the guide rail 251B, and the block 252 and the first movable portion 242 move along the guide rail 251B as the connecting portion 255 moves.
- the connecting portion 255 may be connected to the first movable portion 242.
- guide grooves 256A to 256D (described later) for moving the second movable portion 243 are provided on the upper surface of the first movable portion 242.
- FIG. 6 is a diagram illustrating the first movable portion 242 and the second movable portions 243A and 243B of the moving unit 240.
- the guide grooves 256A to 256D of the first movable portion 242 are provided so as to extend in a direction (lateral direction) perpendicular to the direction of the guide rails 251A and 251B in the fixed portion 241.
- a plurality (two in this example) of blocks 257 are attached to each of the guide grooves 256A to 256D so as to be movable along the guide grooves 256A to 256D.
- through holes 242a and 242b are provided at locations of the first movable portion 242 corresponding to the portions on which the second movable portions 243A and 243B are placed, and the bottom molds 214 and 224 and the lifting device 280 are connected to each other. It is possible to concatenate. When the bottom molds 214 and 224 are not connected to the lifting device 280, the tip of the lifting device 280 is retracted below the through holes 242a and 242b and does not interfere with the first movable portion 242 (the mold unit 210). , 220).
- the lower ends of the coupling mechanisms of the bottom molds 214 and 224 in the non-coupled state may be disposed above the through holes 242a and 242b, or protrude below the through holes 242a and 242b and above the fixing portion 241. It may be arranged at the position.
- the second movable portions 243A and 243B are formed of a pair of plate-like members that are split in the left-right direction, and the lower surface side is fixed to the upper portion of the block 257.
- Each of the pair of second movable portions 243A is disposed across the guide grooves 256A and 256B, and is fixed to a block 257 attached to the guide grooves 256A and 256B.
- each of the second movable portions 243B is fixed to a block 257 attached to the guide grooves 256C and 256D.
- Each of the second movable portions 243A is configured to move independently along the guide grooves 256A and 256B together with the block 257 as the fixed block 257 moves.
- each of the second movable portions 243B is configured to move independently along the guide grooves 256C and 256D together with the fixed block 257.
- the guide grooves 256A to 256D and the block 257 are provided.
- the guide rail and the block described with reference to FIG. 5 may be provided.
- a single protrusion 258 that can be engaged with a cylinder plate (mold opening / closing plate) 262 of the hydraulic cylinder 245 is formed on the upper surface of the second movable parts 243A, 243B.
- the convex portion 258 extends in the same direction as the direction in which the guide rails 251A and 251B of the fixed portion 241 extend.
- the first movable portion 242 and the second movable portions 243A and 243B are provided with positioning means 259 for fixing the positions of the second movable portions 243A and 243B with respect to the first movable portion 242 to predetermined mold opening positions, respectively. It has been.
- the second movable portions 243A and 243B are configured such that the holes 259a formed in the second movable portions 243A and 243B coincide with the holes 259a formed in the first movable portion 242 and the positioning pin 259b is inserted from above.
- the first movable part 242 is fixed at a predetermined position.
- the mold units 210 and 220 are always set in a fixed state at a predetermined mold opening position, and the second movable part 243 is moved in the mold opening / closing direction.
- the fixed state is always released before moving.
- Each split mold of the first mold unit 210 is fixed on the pair of second movable parts 243A, and each split mold of the second mold unit 220 is fixed on the pair of second movable parts 243B. Is done.
- a gap (through hole) 243a (243b) is formed between the pair of second movable portions 243A (243B).
- the connecting mechanism of the bottom molds 214 and 224 protrudes from the through hole 241a of the fixed plate 241 through the gap (through hole) 243a of the second movable part 243A (243B) and the through hole 242a (242b) of the first movable part 242. Connected to the lifting device 280.
- the hydraulic cylinder 245 includes a cylinder rod (extension / contraction mechanism) 261 that expands and contracts as the piston moves, and a cylinder plate (mold opening / closing plate) 262 attached to the tip of the cylinder rod 261 (FIGS. 2 and 4). reference).
- the pair of hydraulic cylinders 245 are arranged so that the cylinder plates 262 face each other on the left and right sides of the central portion in the longitudinal direction (front-rear direction) of the fixed portion 241.
- the cylinder plate 262 is provided with a convex portion 263 for engaging with the concave portion 215 formed in the first mold unit 210 or the concave portion 225 formed in the second mold unit 220.
- the cylinder plate 262 is provided with a concave portion 264 for engaging with the convex portion 258 of the second movable portions 243A and 243B.
- the convex portion 263 and the concave portion 264 extend in the same direction as the direction in which the guide rails 251A and 251B of the fixed portion 241 extend.
- the concave portion 215 of the first mold unit 210 and the concave portion 225 of the second mold unit 220 also extend in the same direction as the direction in which the guide rails 251A and 251B of the fixed portion 241 extend.
- the hydraulic cylinder 245 causes the cylinder plate 262 to contact the back surface of the first mold unit 210 or the second mold unit 220 by engaging the cylinder plate 262 with the above-described parts, and the cylinder rod 261 is expanded and contracted.
- the first mold unit 210 or the second mold unit 220 is pushed and pulled to control its position.
- a blow core mold (not shown) is provided above the support portion 270.
- the blow core mold is fitted into the mouth of the preform 5 or the intermediate molded body 6 supported by the support portion 270, and the blow air is introduced into the preform 5 in the first mold unit 210 so that the preform 5 is inserted.
- the intermediate molded body 6 is blow-molded, and the intermediate molded body 6 is blow-molded into a container by introducing blow air into the intermediate molded body 6 in the second mold unit 220.
- an extension rod configured to be able to adjust the stroke of the rod is installed above the support portion 270.
- the support portion 270 is configured to be movable up and down, for example.
- the plurality of preforms 5 are taken in and out of the first mold unit 210 in a state where the split mold is opened, and the second A plurality of intermediate molded bodies 6 (six in this example) are put in and out of the mold unit 220. That is, the blow core mold and the extending rod are shared by the first mold unit 210 (heat treatment blow) and the second mold unit 220 (final blow).
- the blow molding unit 20 has the above-described configuration, that is, the first mold unit 210 having the heat treatment blow mold and the final blow by sliding the first movable part 242 by the motor (first drive mechanism) 244.
- the second mold unit 220 having a mold can be alternately inserted between a pair of hydraulic cylinders (second drive mechanism, mold opening / closing mechanism) 245. In this way, by moving the first mold unit 210 and the second mold unit 220 relative to the support portion 270, it is possible to continuously perform the heat treatment blow and the final blow. It has become.
- To move “relatively” means that the first mold unit 210 and the second mold unit 220 arranged on the fixed part 241 are supported by the support part 270 that supports the preform 5 or the intermediate molded body 6.
- the blow molding unit 20 includes the first mold unit 210 and the second mold unit 220 that are not connected to each other between the pair of cylinder plates (mold opening / closing plates) 262, and the moving unit 240. It is the structure which can be made to advance / retreat sequentially.
- the mold opening / closing and clamping processes of the two mold units 210 and 220 are performed by one mold opening / closing mechanism 245, and the preform 5 of the support member 270 is subjected to double heat treatment blow and final blow. Blowing (continuous blowing process) can be continuously performed at the same position.
- the six preforms 5 are manufactured by injecting resin from the injection device 12 into the space formed by mold closing (step S101).
- each preform 5 is transported to the temperature control unit 15 by the transport unit 30.
- the temperature of the preform 5 is adjusted so that the entire preform 5 has a uniform temperature distribution and approaches a temperature suitable for stretching and blowing (step S102).
- the first movable part 242 is slid along the guide rails 251A and 251B, and the first mold unit 210 is kept waiting at a position where the preform 5 is blown by heat treatment.
- the first mold unit 210 and the second mold unit 220 are both in a state where the split mold is opened.
- the second movable portion 243B where the second mold unit 220 is disposed is fixed at a predetermined mold opening position by the positioning means 259.
- the second movable portion 243A in which the first mold unit 210 is disposed is released from the fixed state by the positioning means 259 and is movable along the guide grooves 256A and 256B.
- the cylinder plate 262 of the hydraulic cylinder 245 is in a state in which the convex portion 263 is engaged with the concave portion 215 of the first mold unit 210 and the concave portion 264 is engaged with the convex portion 258 of the second movable portion 243A. (See a101 and b101 in FIG. 8).
- the lifting device (lifting rod) 280 coupled to the bottom mold 214 is raised from the lower standby position to the upper coupling position.
- the lifting device 280 is fixed to the blow molding machine 1 so as to be lifted and lowered.
- the second movable portion 243A is moved along the guide grooves 256A and 256B to close the first mold unit 210, and the machine-side lifting device 280 and The bottom mold 214 is connected. Thereafter, the bottom mold 214 is further raised and brought into contact with the first mold part 211 to form the first space 212 for the intermediate molded body 6. At this time, the temperature of the first inner wall surface 213 of the first mold part 211 is adjusted to a first temperature (for example, 170 ° C.) by the heating device, and the temperature of the bottom mold 214 is adjusted to, for example, 100 ° C.
- a first temperature for example, 170 ° C.
- the bottom die 214 is lowered to be in a non-contact state with the first die portion 211, and then the cylinder rod 261 is contracted to move the second movable portion 243A along the guide grooves 256A and 256B, opposite to the above b103.
- the first mold unit 210 blown by heat treatment is opened (see a104 and b104 in FIG. 9). Simultaneously with the mold opening, the connection between the bottom mold 241 and the lifting device 280 is released at the connecting position, and then the lifting device 280 is lowered and returned to the standby position. Further, the first mold unit 210 (second movable portion 243A) is fixed by the positioning means 259 so as to stop at the position where the mold is opened.
- each intermediate molded body 6 immediately after being blown by heat treatment in the first mold part 211 is larger than or substantially equal to the second space 222 of the second mold part 221. Yes.
- Each intermediate molded body 6 released from the first mold part 211 by opening the first mold unit 210 is reduced in size and is equal to or smaller than the second space 222 of the second mold part 221.
- the first movable portion 242 is slid along the guide rails 251A and 251B by the motor 244 so that the second mold unit 220 comes to a position where each intermediate molded body 6 is finally blown (step).
- step S105, see a105 and b105 in FIG. 10).
- the position of the support part 270 does not move, the position of the support part 270 supporting each preform 5 (see a102 and b102 in FIG. 8), and the support part 270 supporting each intermediate molded body 6 are provided.
- the position (see a105 and b105 in FIG. 10) is maintained at the same position.
- the first mold unit 210 and the second mold unit 220 have guide rails 251A and 251B extending with respect to the support portion 270 maintained at the same position in order to perform the final blow following the heat treatment blow. It is moved relatively along the direction. “Blowing is performed continuously” means that in this example, the blow interval is not widened so that the temperature of the intermediate molded body 6 blown by the heat treatment in the first mold unit 210 is not greatly lowered to, for example, the normal temperature level (for example, 5 This means that the final blow is performed within 10 seconds.
- the sliding movement of the first movable part 242 disengages the concave part 215 of the first mold unit 210 from the convex part 263 of the cylinder plate 262, and the convex part 258 of the second movable part 243A and the concave part of the cylinder plate 262. H.264 is disengaged. Then, the concave portion 225 of the second mold unit 220 engages with the convex portion 263 of the cylinder plate 262, and the convex portion 258 of the second movable portion 243B engages with the concave portion 264 of the cylinder plate 262. Before the second mold unit 220 reaches the final blow position, the lifting device 280 is raised from the lower standby position to the upper connection position.
- the second mold unit 220 is released from the fixed state by the positioning means 259, and the cylinder rod 261 is extended to move the second movable portion 243B along the guide grooves 256C and 256D to thereby move the second mold unit 220.
- the bottom mold 224 and the lifting device 280 are connected.
- the bottom mold is raised and brought into contact with the second mold part 221, and each intermediate molded body 6 is accommodated in the second space 222 of the second mold part 221 (see step S106, a106 and b106 in FIG. 10). ).
- the temperature control device adjusts the temperature of the second inner wall surface 223 of the second mold part 221 to the second temperature (for example, 120 ° C.), and adjusts the temperature of the bottom mold 224 to, for example, 100 ° C.
- blow air is introduced from the blow core mold into the intermediate molded body 6, and the stretching rod is extended in accordance with the longitudinal length of the second space 222, so that six intermediate molded bodies are formed in the second mold portion 221. 6 is finally blow-molded into six containers 7 (see step S107, a107, b107 in FIG. 11).
- the final blown second mold unit 220 is opened (see a108 and b108 in FIG. 11).
- the connection between the bottom mold 224 and the lifting device 280 is released, and the lifting device 280 is lowered.
- the container 7 is released from the second mold part 221 by opening the second mold unit 220.
- the support part 270 is raised and each container 7 supported by the support part 270 is collected (step S108).
- the first movable portion 242 is slid along the guide rails 251A and 251B by the motor 244 (a109 and b109 in FIG. 12).
- the first mold unit 210 returns to the blow molding start state at the position where the preform 5 is subjected to the heat treatment blow (see step S109, a110, b110 in FIG. 12).
- both the heat treatment blow and the final blow and the method in which the final container is formed by blowing once to the preform, the sticking to the mold, etc.
- the blow mold could not be set to a very high temperature (for example, it was possible to blow only at about 130 ° C.).
- the crystallization density of the PET bottle manufactured by the one-stage / one-blow method is not so high compared to the PET bottle manufactured by the two-stage / two-blow method.
- the distortion (residual stress) of the PET bottle which arises at the time of blow molding also increases.
- the blow molding apparatus 1 and the blow molding method of the present embodiment after the preform 5 is injection-molded, the heat treatment blow of the preform 5 and the final blow of the intermediate molded body 6 are continuously performed separately. A one-stage, two-blow system is used. For this reason, since the preform 5 manufactured by the injection molding unit 10 is blown by heat treatment without being cooled to room temperature, energy for reheating the preform 5 to a suitable temperature for blowing is not required, and energy efficiency is improved. be able to.
- the configuration of the one-stage / two-blow method of this example it is possible to reduce the size of the blow molding apparatus 1 as compared with the two-stage / two-blow system, and the equipment cost of the blow molding apparatus 1 is reduced. It can be reduced, and the installation space can be reduced. For example, only one mold closing mechanism is required, and the blow molding apparatus 1 can be installed only once. Moreover, injection molding, heat treatment blow, and final blow can be performed in a short time, and can be repeated.
- the first mold unit 210 provided with a plurality of first mold parts 211 and the second mold unit 220 provided with a plurality of second mold parts 221 are separately provided, heat treatment is performed.
- the process of performing the blow can be performed independently of the process of the final blow that is performed continuously next.
- the first temperature used in the heat treatment blow step is set to a temperature higher than the second temperature (eg, 120 ° C.) used in the final blow step, for example, a temperature that promotes crystallization of the resin (eg, 170 ° C.).
- the container which can be set and sufficient heat resistance was provided can be obtained.
- “sufficient” heat resistance means heat resistance to such an extent that shrinkage deformation hardly occurs even when a liquid having a temperature of about 90 ° C. or higher which is heated for sterilization purposes is filled.
- first mold unit 210 and the second mold unit 220 arranged on the fixing portion 241 are simultaneously slid along the guide rails 251A and 251B, so that the mold unit is blown by heat treatment.
- the first mold unit 210 can be changed to the second mold unit 220 that finally blows the intermediate molded body 6.
- the heat treatment blow process and the final blow process can be performed smoothly and continuously, and it is not necessary to perform a process for avoiding a temperature drop on the intermediate molded body 6, thereby improving energy efficiency.
- the size of the neck type (neck type fixing plate) constituting the support portion 270 does not need to be changed from that of the conventional one-stage apparatus, and the same number of preforms are conveyed. It becomes possible. Therefore, it is possible to manufacture a bottle having higher heat resistance while maintaining the production amount equivalent to that of the one-stage / one-blow method.
- a mechanical configuration for continuously executing the heat treatment blow step and the final blow step intersects the first movable portion 242 movable along the longitudinal direction of the fixed portion 241 perpendicularly to the longitudinal direction.
- the second movable portion 243 that can move in the direction can be easily realized.
- the support part 270 for supporting the preform 5 and the support part 270 for supporting the intermediate molded body 6 are shared, they are held at the same position. For this reason, the process of blow-treating the preform 5 at the first temperature and the process of blow-molding the intermediate molded body 6 at the second temperature to manufacture the container can be performed separately and smoothly.
- the first space 212 of the first mold part 211 is formed to have a size (volume) larger than or substantially the same as the second space 222 of the second mold part 221. For this reason, the first space 212 is made larger than the second space 222 in consideration of shrinkage after the heat treatment blow, and the preform 5 may be blow-molded temporarily larger than the size (volume) of the final container and highly stretched. it can. Thereby, the residual stress (strain caused by stretching orientation) remaining in the final molded product (container) can be reduced.
- the temperature distribution on the preform 5 may be biased due to the influence of heat during injection.
- the temperature control process is performed on the injection-molded preform 5 and the heat treatment blow is performed on the preform 5 after the temperature control process. 7, the uneven temperature that can occur on the surface 7 can be reduced, and uneven thickness hardly occurs. For this reason, more stable heat resistance can be obtained.
- the moving unit 240 is provided with positioning means 259 for positioning the positions of the second movable parts 243A and 243B with respect to the first movable part 242, the positions of the second movable parts 243A and 243B are accurately positioned. be able to. More specifically, before and after the sliding movement of the first movable part 242 (die unit 210, 220), the cylinder plate (die opening / closing plate) 262, the first die part 211, and the second die part 221 It is possible to keep the gap optimal. For this reason, when sliding the 1st movable part 242, the malfunction of engagement with the die unit and the 2nd movable part, and cylinder plate resulting from position shift becomes difficult to occur.
- the conventional two-stage / one-blow type apparatus can produce a PET bottle that can withstand high-temperature filling, it is necessary to heat the preform to an appropriate temperature after the preform has been naturally cooled. It was low.
- it is an apparatus suitable for mass production of small-sized bottles, and when producing a large variety of bottles in a small lot, it tends to be over-spec, and it does not meet the needs in terms of cost.
- the heat resistance performance of the bottle manufactured by the two-stage / one-blow method tends to decrease as moisture in the air is absorbed. In other words, if the manufactured bottle is stored to cause time to elapse from the manufacturing, the heat resistance performance is significantly lowered.
- a blow molding apparatus and a blow molding method are provided that are suitable for a mode in which a high-mix content cannot be filled immediately after bottle production, in which a variety of small lots are generated. can do.
- this invention is not limited to embodiment mentioned above, A deformation
- the material, shape, dimension, numerical value, form, number, location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.
- the first mold part 211 and the second mold part 221 are provided in a state where six mold parts are arranged in a row, but the present invention is not limited to this example.
- the blow molding unit 20A according to the modified example includes two rows of first mold parts 211 in which six first-stage mold units 210A that heat-process blow the preform 5 are arranged in the left-right direction. It is set as the structure arrange
- the second mold unit 220A (not shown) for finally blowing the intermediate molded body 6 has the same configuration.
- the support portions 270 are also provided in two rows in parallel, and the first mold unit 210A and the second mold unit 220A arranged on the first movable portion are connected to the first movable portion. As the slide moves, it moves relative to the support portion 270. In addition, you may deform
- a pneumatic drive source such as an air cylinder instead of the motor 244, and an electric motor, a toggle link mechanism, and a toggle link opening / closing plate instead of the hydraulic cylinder 245, the cylinder rod 261, and the cylinder plate 262.
- the mold opening / closing mechanism may be adopted.
- blow molding device 5: preform
- 6 intermediate molded body
- 7 container
- 10 injection molding unit
- 12 injection device
- 15 temperature control unit
- 20 blow molding unit
- 25 take-out unit
- 210 First mold unit, 211: first mold part, 215, 225: recess
- 220 second mold unit
- 221 second mold part
- 240 moving unit
- 241 fixed part
- 242 first One movable portion
- 243 second movable portion
- 245 hydraulic cylinder
- 251A, 251B guide rail
- 252 block
- 256A to 256D guide groove
- 258 convex portion
- 259 positioning means
- 261 Cylinder rod
- 262 Cylinder plate
- 263 Convex part
- 264 Concave part
- 270 Support part
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
ブロー成形ユニットと、
前記プリフォームを支持する支持部と、
前記支持部を前記ブロー成形ユニットに搬送する搬送ユニットと、を有し、
前記ブロー成形ユニットは、
前記プリフォームを第一温度で熱処理ブローする第一工程を実行するための第一金型と、前記熱処理ブローによりブロー成形された中間成形体を前記第一温度より低い第二温度でブロー成形して、容器を製造する第二工程を実行するための第二金型と、前記第一工程と前記第二工程とを連続して実行するために、前記支持部に対して前記第一金型と前記第二金型を相対的に移動させることが可能な移動ユニットと、を有する。
前記移動ユニットは、
長尺かつ板状の固定部と、
前記固定部上で前記固定部の長手方向に沿って移動可能な板状の第一可動部と、
前記第一可動部上で前記長手方向に対して垂直に交差する方向に移動可能な板状の第二可動部と、
を備え、
前記第一金型及び前記第二金型は、前記第二可動部上に固定されていることが好ましい。
前記第一工程において前記支持部が前記プリフォームを支持する位置と、前記第二工程において前記支持部が前記中間成形体を支持する位置とは同じであることが好ましい。
前記第一金型は、前記プリフォームが配置される第一空間を規定する第一内壁面を有し、
前記第二金型は、前記中間成形体が配置される第二空間を規定する第二内壁面を有し、
前記第一空間は前記第二空間より大きいことが好ましい。
前記射出成形ユニットで製造された前記プリフォームを均等な温度分布に近付けるための温調処理を行なう温調ユニットを、備え、
前記ブロー成形ユニットは、前記温調ユニットで前記温調処理が実行された前記プリフォームに対して前記熱処理ブローを行なうことが好ましい。
上記構成によれば、射出成形されたプリフォームに対して温調処理を行ない、温調処理後のプリフォームに対して熱処理ブローが行なわれるため、中間成形体や最終の容器上において生じ得る偏温を小さくすることができ偏肉が生じにくくなる。このため、さらに安定した耐熱性を得ることができる。
樹脂製の有底のプリフォームを射出成形する射出成形工程と、
前記射出成形の工程で製造されたプリフォームを第一金型を用いて第一温度で熱処理ブローする第一工程と、前記熱処理ブローによりブロー成形された中間成形体を、第二金型を用いて前記第一温度より低い第二温度でブロー成形して容器を製造する第二工程と、を連続して行なう連続ブロー工程と、
を含む。
以上のように、上記構成によれば、エネルギー効率の向上と耐熱性能の向上とを両立させることが可能なブロー成形方法を提供することができる。
前記射出成形工程の後、前記射出成形工程で製造された前記プリフォームを均等な温度分布に近付けるための温調処理を行なう温調工程を、含み、
前記連続ブロー工程の前記第一工程では、前記温調工程で前記温調処理が実行された前記プリフォームに対して前記熱処理ブローを行なうことが好ましい。
上記方法によれば、射出成形されたプリフォームに対して温調処理を行ない、温調処理後のプリフォームに対して熱処理ブローが行なわれるため、中間成形体や最終の容器上において生じ得る偏温を小さくすることができ偏肉が生じにくくなる。このため、さらに安定した耐熱性を得ることができる。
前記第一温度は、ポリエチレンテレフタレートの結晶化が促進されやすい温度であることが好ましい。
先ず、図1を参照して、ブロー成形装置について説明する。
なお、各図において、前後方向、左右方向、上下方向が図示されているが、本例では、これらの各方向は互いに直交している。前後方向は、後述する2つの金型ユニット210,220がガイドレール上をスライド移動する方向の一例である。左右方向は、後述する第一金型ユニット210や第二金型ユニット220が型開き又は型閉めするときの金型の移動方向の一例である。上下方向は、後述する支持部270が昇降する方向の一例である。各方向の名称は、装置が水平面に設置された場合に、操作者(観察者)から装置を見た方向で定義されているが、これらの方向の名称は一例であり、発明の適用範囲を限定するものではない。
ブロー成形装置1は、基台11の上に、プリフォームを製造するための射出成形ユニット10と、製造されたプリフォームの温度を調整するための温調ユニット15とを備えている。射出成形ユニット10には、容器の原材料である樹脂を供給する射出装置12が接続されている。また、ブロー成形装置1は、プリフォームをダブル・ブローして容器を製造するためのブロー成形ユニット20と、製造された容器を取り出すための取出ユニット25とを基台11の上に備えている。
このように、ブロー成形装置1は、全体としては、1ステージ式の構成になっている。
また、第二可動部243A,243Bが載置される部位に対応した第一可動部242の箇所には、貫通孔242a,242bが設けられており、底型214,224と昇降装置280との連結を可能としている。底型214,224と昇降装置280とが非連結である場合は、昇降装置280の先端は貫通孔242a,242bより下方に退避されており干渉しないため、第一可動部242(金型ユニット210,220)のスライド移動が可能となる。なお、非連結状態にある底型214,224の連結機構の下端は、貫通孔242a,242bより上方に配置されていても良いし、貫通孔242a,242bより下方に突出して固定部241より上方の位置に配置されていても良い。
先ず、射出成形ユニット10において、型閉じにより形成された空間内に、射出装置12から樹脂を射出して6個のプリフォーム5を製造する(ステップS101)。
また、この2ステージ・1ブロー方式で製造されたボトルの耐熱性能は、空気中の湿気を吸湿するにつれ低下してしまう傾向にある。つまり、製造したボトルを保管する等して、製造から時間を経過させてしまうような事があると、耐熱性能は著しく低下する。大手(大企業)のボトルメーカーであれば、自社工場内に、ブロー成形機と高温内容物用の充填装置とを連結させた大掛かりな設備も用意でき、製造直後のボトルに高温液体物を充填することも可能である。つまり、インラインで充填できるため、この影響は比較的小さい。しかし、中小規模のボトルメーカーはボトルの製造のみ行い、充填工程はボトルの納品先(客先)で実施される場合が多いため、吸湿に伴う耐熱性能の低下の影響は無視できない。吸湿に伴う耐熱性能の低下は、特許文献1にあるダブル・ブロー(2ステージ・2ブロー方式)の技術を行えば緩和できるが、中小規模のボトルメーカーに適した、多品種小ロット生産用のダブル・ブロー式の成形機は現状では存在していなかった。
(変形例)
次に、上記ブロー成形ユニット20の変形例について説明する。
図13に示すように、変形例に係るブロー成形ユニット20Aは、プリフォーム5を熱処理ブローする第一金型ユニット210Aが、左右方向へ6個並ぶ第一金型部211を前後方向へ2列に連結して配置した構成とされている。また、中間成形体6を最終ブローする第二金型ユニット220A(図示省略)も同様の構成とされている。この場合、支持部270も同様に並列して2列に設けられており、第一可動部上に配置された第一金型ユニット210Aと第二金型ユニット220Aとが、第一可動部のスライド移動に伴って、支持部270に対して相対的に移動する。なお、2列に限らず3列以上に変形しても良い。
例えば、モータ244の代わりにエアシリンダといった空圧駆動原、また、油圧シリンダ245、シリンダロッド261、シリンダ板262の代わりとして、電動モータ、トグルリンク機構、トグルリンク用型開閉板、からなる電動式の型開閉機構を採用しても良い。
本出願は、2016年2月19日出願の日本特許出願・出願番号2016-030471に基づくものであり、その内容はここに参照として取り込まれる。
Claims (8)
- 樹脂製の有底のプリフォームを製造する射出成形ユニットと、
ブロー成形ユニットと、
前記プリフォームを支持する支持部と、
前記支持部を前記ブロー成形ユニットに搬送する搬送ユニットと、
を備え、
前記ブロー成形ユニットは、
前記プリフォームを第一温度で熱処理ブローする第一工程を実行するための第一金型と、前記熱処理ブローによりブロー成形された中間成形体を前記第一温度より低い第二温度でブロー成形して、容器を製造する第二工程を実行するための第二金型と、前記第一工程と前記第二工程とを連続して実行するために、前記支持部に対して前記第一金型と前記第二金型を相対的に移動させることが可能な移動ユニットと、を有する、
ことを特徴とする、ブロー成形装置。 - 前記移動ユニットは、
長尺かつ板状の固定部と、
前記固定部上で前記固定部の長手方向に沿って移動可能な板状の第一可動部と、
前記第一可動部上で前記長手方向に対して垂直に交差する方向に移動可能な板状の第二可動部と、
を備え、
前記第一金型及び前記第二金型は、前記第二可動部上に固定されている、
請求項1に記載のブロー成形装置。 - 前記第一工程において前記支持部が前記プリフォームを支持する位置と、前記第二工程において前記支持部が前記中間成形体を支持する位置とは同じである、
請求項1に記載のブロー成形装置。 - 前記第一金型は、前記プリフォームが配置される第一空間を規定する第一内壁面を有し、
前記第二金型は、前記中間成形体が配置される第二空間を規定する第二内壁面を有し、
前記第一空間は前記第二空間より大きい、
請求項1に記載のブロー成形装置。 - 前記射出成形ユニットで製造された前記プリフォームを均等な温度分布に近付けるための温調処理を行なう温調ユニットを、備え、
前記ブロー成形ユニットは、前記温調ユニットで前記温調処理が実行された前記プリフォームに対して前記熱処理ブローを行なう、
請求項1に記載のブロー成形装置。 - 樹脂製の有底のプリフォームを射出成形する射出成形工程と、
前記射出成形の工程で製造されたプリフォームを第一金型を用いて第一温度で熱処理ブローする第一工程と、前記熱処理ブローによりブロー成形された中間成形体を、第二金型を用いて前記第一温度より低い第二温度でブロー成形して容器を製造する第二工程と、を連続して行なう連続ブロー工程と、
を含む、ブロー成形方法。 - 前記射出成形工程の後、前記射出成形工程で製造された前記プリフォームを均等な温度分布に近付けるための温調処理を行なう温調工程を、含み、
前記連続ブロー工程の前記第一工程では、前記温調工程で前記温調処理が実行された前記プリフォームに対して前記熱処理ブローを行なう、
請求項6に記載のブロー成形方法。 - 前記第一温度は、ポリエチレンテレフタレートの結晶化が促進されやすい温度である、
請求項6に記載のブロー成形方法。
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