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WO2017037993A1 - 合成樹脂製容器およびその製造方法 - Google Patents

合成樹脂製容器およびその製造方法 Download PDF

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Publication number
WO2017037993A1
WO2017037993A1 PCT/JP2016/003357 JP2016003357W WO2017037993A1 WO 2017037993 A1 WO2017037993 A1 WO 2017037993A1 JP 2016003357 W JP2016003357 W JP 2016003357W WO 2017037993 A1 WO2017037993 A1 WO 2017037993A1
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WO
WIPO (PCT)
Prior art keywords
synthetic resin
resin container
crystal orientation
body portion
container
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2016/003357
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English (en)
French (fr)
Inventor
雄一 奥山
満 塩川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yoshino Kogyosho Co Ltd
Original Assignee
Yoshino Kogyosho Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yoshino Kogyosho Co Ltd filed Critical Yoshino Kogyosho Co Ltd
Priority to CN201680050066.9A priority Critical patent/CN107922077B/zh
Priority to US15/756,458 priority patent/US10934048B2/en
Priority to EP16841037.1A priority patent/EP3342723B1/en
Publication of WO2017037993A1 publication Critical patent/WO2017037993A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • 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—Rigid or semi-rigid 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 or by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by 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
    • B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
    • 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
    • B29C49/783—Measuring, controlling or regulating blowing pressure
    • 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
    • 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—Rigid or semi-rigid 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 or by deep-drawing operations performed on sheet material
    • 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—Rigid or semi-rigid 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 or by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • 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—Rigid or semi-rigid 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 or by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0207—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
    • 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
    • B29C2049/4602—Blowing fluids
    • B29C2049/465—Blowing fluids being incompressible
    • B29C2049/4664—Blowing fluids being incompressible staying in the final article
    • 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
    • B29C2049/7879—Stretching, e.g. stretch rod
    • 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
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • 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
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/087—Means for providing controlled or limited stretch ratio
    • 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
    • B29C49/4273—Auxiliary operations after the blow-moulding operation not otherwise provided for
    • B29C49/428—Joining
    • B29C49/42802—Joining a closure or a sealing foil to the article or pincing the opening
    • 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
    • B29C49/4273—Auxiliary operations after the blow-moulding operation not otherwise provided for
    • B29C49/42808—Filling the article
    • 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
    • B29C49/4273—Auxiliary operations after the blow-moulding operation not otherwise provided for
    • B29C49/4283—Deforming the finished article
    • B29C49/42832—Moving or inverting sections, e.g. inverting bottom as vacuum panel
    • 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
    • B65D2501/00—Containers having bodies formed in one piece
    • B65D2501/0009—Bottles or similar containers with necks or like restricted apertures designed for pouring contents
    • B65D2501/0018—Ribs
    • B65D2501/0027—Hollow longitudinal ribs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the present invention relates to a synthetic resin container formed in a bottle shape having a mouth portion and a body portion and having a reduced pressure absorption panel in the body portion, and a method for manufacturing the same.
  • a synthetic resin container for example, a PET bottle formed in a bottle shape having a mouth portion and a trunk portion from a synthetic resin material has been used as a container for storing beverages such as fruit juice drinks and tea.
  • the filling of the content liquid into the container is generally performed by a technique called hot filling (hot fill) in which the content liquid is heated to a predetermined temperature (for example, 85 ° C. or higher).
  • a predetermined temperature for example 85 ° C. or higher.
  • a method of forming the container there is a method (liquid blow molding) of blow molding with a liquid.
  • the liquid is heated to a predetermined temperature and supplied to the preform at a predetermined pressure.
  • the container is filled with the sterilized content liquid.
  • a container formed by conventional air blow molding and a container formed by liquid blow molding may have different deformation behaviors at the time of cooling. Even in the case where the body portion is provided, there is a problem that deformation of the body portion cannot be sufficiently suppressed, for example, the body portion deforms unevenly in the circumferential direction.
  • the present invention has been made in view of such problems, and the object thereof is to sufficiently suppress the decompression deformation generated in the body portion even when the content liquid is hot-filled by liquid blow molding.
  • the object is to provide a synthetic resin container and a method for producing the same.
  • the synthetic resin container of the present invention is a synthetic resin container that is formed in a bottle shape having a mouth portion and a trunk portion, and is provided with a vacuum absorbing panel in the trunk portion, and the density of the trunk portion is 1.3695 g. / Cm 3 or more, and the ratio of the crystal orientation degree in the transverse direction to the total value of the crystal orientation degree in the longitudinal direction and the crystal orientation degree in the transverse direction in the body portion is less than 44%. .
  • the synthetic resin container of the present invention may have a configuration in which the body portion is formed in a substantially circular cross section in the above configuration.
  • the synthetic resin container of the present invention may be configured such that in the above configuration, the six vacuum absorption panels are arranged in the body portion at equal intervals in the circumferential direction.
  • the synthetic resin container of the present invention can be made of polyethylene terephthalate in the above configuration.
  • the method for producing a synthetic resin container according to the present invention is such that a liquid heated to a predetermined temperature is supplied at a predetermined pressure to a preform formed into a cylindrical shape with a bottom by a thermoplastic resin, and the preform is subjected to liquid blow molding. Then, the above synthetic resin container is manufactured.
  • the present invention it is possible to provide a synthetic resin container and a method for manufacturing the same that can sufficiently suppress the deformation under reduced pressure that occurs in the body even when the content liquid is hot-filled by liquid blow molding.
  • the synthetic resin container of the present invention is a synthetic resin container that is formed into a bottle shape having a mouth portion and a trunk portion, and is provided with a vacuum absorbing panel in the trunk portion, and the density of the trunk portion is 1.3695 g / cm. 3 or more, and the ratio of the crystal orientation degree in the transverse direction to the total value of the crystal orientation degree in the longitudinal direction and the crystal orientation degree in the transverse direction is less than 44%. It is.
  • a synthetic resin container 1 according to an embodiment of the present invention is shown in FIG.
  • a synthetic resin container 1 shown in FIG. 1 is used, for example, for containing beverages such as fruit juice drinks and tea, and has a cylindrical mouth portion 2 and a trunk portion connected to the mouth portion 2 via a shoulder portion 3. 4 and the bottom part 5 which obstruct
  • drum 4 become a bottle shape.
  • the body 4 has a substantially circular cross section, that is, a substantially cylindrical shape, and the shoulder 3 connecting the body 4 to the mouth 2 is formed in a substantially dome shape.
  • the body 4 is provided with six vacuum absorbing panels 6 arranged at equal intervals in the circumferential direction. Although only three decompression absorption panels 6 are shown in the drawing, the three decompression absorption panels 6 are similarly provided on the back side of the body 4.
  • These vacuum absorption panels 6 are each formed in a substantially rectangular shape extending in the vertical direction (vertical direction in the drawing) and are recessed toward the inside of the body 4 with respect to the outer peripheral surface of the body 4. These vacuum absorption panels 6 are used when the liquid (content liquid) is cooled in a state in which the mouth portion 2 is closed with a cap after the liquid is filled, and the internal pressure of the synthetic resin container 1 is reduced accordingly. By deforming in the depression direction preferentially over other parts of the body part 4 and absorbing the reduced pressure, unauthorized deformation of the body part 4 can be suppressed.
  • the reduced pressure absorption panel 6 is not limited to the above configuration, and the shape, the number, the arrangement, and the like are variously changed as long as the reduced pressure is absorbed when the reduced pressure is generated inside the synthetic resin container 1. Is possible.
  • the reduced pressure absorption panel 6 can be configured so as not to bulge and deform toward the radially outer side of the body portion 4 even if the inside of the synthetic resin container 1 is filled with liquid. That is, in a container formed by air blow molding, in order to enhance the vacuum absorption effect, the vacuum absorption panel is generally configured to bulge and deform when filled with the content liquid. In the container to be formed, since the filling of the content liquid and the molding of the container are performed at the same time, the reduced pressure absorption panel does not bulge and deform at the time of filling the content liquid. Can be adopted.
  • the two upper annular concave ribs 7. are arranged side by side.
  • two lower annular recesses are provided between the body part 4 and the bottom part 5 in order to reinforce the body part 4 and prevent the deformation of the vacuum absorbing panel 6 from proceeding to the bottom part 5 side.
  • Ribs 8 are provided side by side.
  • a neck ring 9 is integrally provided at a lower portion of the mouth portion 2.
  • the mouth part 2 has a configuration in which a cap (not shown) for closing the mouth part 2 can be attached.
  • a screw thread 2a is provided on the outer peripheral surface of the mouth part 2, and the mouth part 2 can be closed by screwing a cap to the screw thread 2a.
  • it can also be set as the structure which replaces with the screw thread 2a in the opening part 2, provides an annular protrusion, and fixes the cap provided with the undercut shape to the opening part 2 by a stopper.
  • the synthetic resin container 1 can be made of, for example, polyethylene terephthalate (PET). That is, the synthetic resin container 1 can be configured as a PET bottle.
  • PET polyethylene terephthalate
  • the synthetic resin container 1 is a method for producing a synthetic resin container according to an embodiment of the present invention, that is, a preform (not shown) formed into a bottomed cylindrical shape (substantially a test tube) with a thermoplastic resin. ) By liquid blow molding. More specifically, the synthetic resin container 1 heats a preform formed in a bottomed cylindrical shape from a thermoplastic resin to a predetermined temperature that develops stretchability, and applies the predetermined temperature to the preform after the heating. It can be manufactured by supplying a liquid heated to a predetermined pressure.
  • the content in the synthetic resin container 1 after molding is obtained by using a content liquid such as a beverage finally contained in the synthetic resin container 1 as a product as a liquid used as a pressure medium at the time of liquid blow molding.
  • a content liquid such as a beverage finally contained in the synthetic resin container 1 as a product as a liquid used as a pressure medium at the time of liquid blow molding.
  • This synthetic resin container 1 has a density of the body portion 4 of 1.3695 g / cm 3 or more, and a longitudinal direction (Machine Direction: MD direction) crystal orientation degree and a transverse direction (Transverse Direction) in the body portion 4.
  • the ratio of the crystal orientation degree in the horizontal direction to the total value of the crystal orientation degree in (TD direction) is less than 44%.
  • the vertical direction in the body part 4 of the degree of crystal orientation is the vertical direction in the figure, and the horizontal direction is a direction along the circumferential direction of the body part 4.
  • the synthetic resin container 1 is filled with the content liquid heated to a predetermined temperature, and the cap is attached to the mouth portion 2. Even if a reduced pressure is generated inside the synthetic resin container 1 by being cooled to room temperature, the reduced pressure is absorbed by the reduced pressure absorption panel 6 and the body part 4 resists the reduced pressure by its own strength, Depressurized deformation of the body part 4 caused by the heat filling of the content liquid can be sufficiently suppressed.
  • the density of the body part 4 described above was measured based on the JIS K 7112 density stiffening tube method. Further, the degree of crystal orientation of the body part 4 is determined in the PET molecular chain seen in the vicinity of 1410 cm ⁇ 1 in the IR spectrum obtained by cutting out the body part 4 as a test piece and measuring by the polarized ATR FT-IR method. The ratio of the in-plane bending vibration of the benzene ring and the absorbance of the CH 2 longitudinal vibration seen in the vicinity of 1340 cm ⁇ 1 was calculated. The crystal orientation is an average value of a value measured from the inner surface side of the test piece and a value measured from the outer surface side.
  • the density of the body part 4 and the ratio of the crystal orientation degree in the transverse direction to the total value of the crystal orientation degree in the longitudinal direction and the crystal orientation degree in the transverse direction in the body part 4 are, for example, the shape of the preform and the preform by blow molding
  • the above range is set by variously changing conditions such as the draw ratio in the machine direction and the transverse direction, the heating temperature of the preform, the temperature of the liquid to be supplied, the temperature of the mold, and the blow time.
  • each bottle is formed into the same 500 ml capacity as shown in FIG. 1 by liquid blow molding, and the density of the barrel and the crystal orientation in the vertical direction in the barrel 11 kinds of synthetic resin containers of NO1 to 11 having different degrees of crystal orientation in the horizontal direction and the presence or absence of decompression deformation of the body portion caused by hot filling of the content liquid in these synthetic resin containers was evaluated.
  • the synthetic resin container was made of polyethylene terephthalate, and the temperature of the liquid filled in the preform during liquid blow molding was 85 ° C. Moreover, after the liquid blow molding, a cap was attached to the mouth portion, and after cooling to room temperature, the presence or absence of decompression deformation of the body portion was evaluated.
  • the evaluation of the barrel deformation is made by measuring the outer diameter of the barrel in three directions that are equally spaced in the circumferential direction using a measuring device such as calipers, and the maximum value of the outer diameter of the barrel in these three directions. If the difference between the minimum value and the minimum value is an ellipticity, and the ellipticity is less than 5% of the average value of the outer diameter of the trunk in the three directions, it is determined that the deformation of the trunk is sufficiently suppressed. Is evaluated as ⁇ , and if the ellipticity is 5% or more with respect to the average value of the outer diameter of the body in the three directions, it is determined that the deformation of the body is not sufficiently suppressed, and the evaluation of x It was. In the present example, the three outer diameter dimensions of the body portion were measured at the columnar portions between the adjacent vacuum absorption panels. The evaluation results are shown in Table 1.
  • the density of the body part is 1.3695 g / cm 3 or more, and the sum of the crystal orientation degree in the longitudinal (MD) direction and the crystal orientation degree in the transverse (TD) direction in the body part.
  • the NO2-4 and 6-11 synthetic resin containers in which the ratio of the degree of crystal orientation in the transverse (TD) direction is less than 44% are less deformed in the body part. Evaluation was (circle).
  • the synthetic resin container of NO1 (container of comparative example) in which the density of the trunk part is less than 1.3681 g / cm 3, that is, less than 1.3695 g / cm 3, and the crystal in the longitudinal (MD) direction in the trunk part.
  • the ratio of the crystal orientation degree in the horizontal (TD) direction to the total value of the orientation degree and the crystal orientation degree in the horizontal (TD) direction is 44.19%, that is, 44% or more.
  • the container) had a large deformation of the body, and the evaluation was x.
  • the density of the barrel portion is set to 1.3695 g / cm 3 or more, and the total of the crystal orientation degree in the longitudinal direction and the lateral crystal orientation degree in the trunk portion.
  • the synthetic resin container 1 of this invention if it is a bottle shape which has the opening part 2 and the trunk
  • the synthetic resin container 1 of the present invention is made of polyethylene terephthalate.
  • the invention is not limited to this, and the synthetic resin container 1 may be made of other synthetic resin materials.
  • the configuration of the synthetic resin container 1 of the present invention may be applicable to a synthetic resin container formed by air blow molding.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

口部（２）と胴部（４）とを備えるボトル形状に形成されるとともに胴部（４）に減圧吸収パネル（６）を備える合成樹脂製容器（１）を、胴部（４）の密度が１．３６９５ｇ／ｃｍ3以上であり、且つ、胴部（４）における縦方向の結晶配向度と横方向の結晶配向度の合計値に対する横方向の結晶配向度の割合が４４％未満となる構成とする。

Description

合成樹脂製容器およびその製造方法
　本発明は、口部と胴部とを備えたボトル形状に形成されるとともに胴部に減圧吸収パネルを備える合成樹脂製容器およびその製造方法に関する。
　従来から、果汁飲料やお茶等の飲料を収容する容器として、合成樹脂材料により口部と胴部とを備えるボトル形状に形成された合成樹脂製容器（例えばＰＥＴボトル）が用いられている。
　このような合成樹脂製容器（以下、単に「容器」という場合がある。）を果汁飲料等の飲料を収容する用途に使用する場合には内容液を殺菌する必要がある。そのため、当該容器への内容液の充填は、内容液を所定の温度（例えば、８５℃以上）にまで加熱した状態で容器に充填する熱充填（ホットフィル）と呼ばれる手法により行われるのが一般的である。例えば、エアブロー成形により容器を成形する場合には、容器を成形した後、所定の温度に加熱された内容液を当該容器内に充填する。そして、その充填後に口部にキャップが装着され、次いで冷却工程において室温にまで冷却されることになる。
　しかしながら、内容液が熱充填された容器を冷却すると、当該冷却の際に容器内の内容液や空気の体積が減少し、これにより容器内に減圧が生じて胴部が陥没変形するおそれがある。そのため、熱充填を伴う用途に使用される容器では、その胴部に減圧吸収パネルを設け、容器内に生じた減圧を減圧吸収パネルの変形により吸収して、胴部が陥没変形するのを抑制するようにしている（例えば特許文献１参照）。
　また、容器を形成する方法としては、液体によってブロー成形する方法（液体ブロー成形）も存在する。この液体ブロー成形により容器を成形しつつ当該容器内に内容液を充填する場合には、所定温度にまで加熱した液体を所定圧力でプリフォームに供給することにより、当該液体によりプリフォームが所定形状の容器に成形され、また、当該容器内に殺菌済みの内容液が充填されることになる。
特開２０１５－３０４８６号公報
　しかしながら、従来のエアブロー成形により形成された容器と液体ブロー成形により形成された容器とでは、前記冷却時の変形挙動が異なる場合があり、液体ブロー成形で形成される容器の胴部に減圧吸収パネルを設けた場合であっても、胴部が周方向に不均一に変形するなど当該胴部の変形を十分に抑制することができない場合があるという問題点があった。
　本発明は、このような課題に鑑みてなされたものであり、その目的は、液体ブロー成形により内容液が熱充填される場合においても、胴部に生じる減圧変形を十分に抑制することができる合成樹脂製容器およびその製造方法を提供することにある。
　本発明の合成樹脂製容器は、口部と胴部とを備えるボトル形状に形成されるとともに前記胴部に減圧吸収パネルを備える合成樹脂製容器であって、前記胴部の密度が１．３６９５ｇ／ｃｍ3以上であり、且つ、前記胴部における縦方向の結晶配向度と横方向の結晶配向度の合計値に対する前記横方向の結晶配向度の割合が４４％未満であることを特徴とする。
　本発明の合成樹脂製容器は、上記構成において、前記胴部が断面略円形に形成された構成とすることができる。
　本発明の合成樹脂製容器は、上記構成において、前記胴部に６枚の前記減圧吸収パネルが周方向に等間隔に並べて設けられている構成とすることができる。
　本発明の合成樹脂製容器は、上記構成において、ポリエチレンテレフタレート製とすることができる。
　本発明の合成樹脂製容器の製造方法は、熱可塑性樹脂により有底筒状に形成されたプリフォームに、所定温度にまで加熱した液体を所定圧力で供給することにより当該プリフォームを液体ブロー成形して、上記の合成樹脂製容器を製造することを特徴とする。
　本発明によれば、液体ブロー成形により内容液が熱充填される場合においても、胴部に生じる減圧変形を十分に抑制することができる合成樹脂製容器およびその製造方法を提供することができる。
本発明の一実施の形態である合成樹脂製容器の一例を示す正面図である。
　以下、図面を参照しつつ本発明の一実施の形態である合成樹脂製容器をより具体的に例示説明する。
　本発明の合成樹脂製容器は、口部と胴部とを備えるボトル形状に形成されるとともに胴部に減圧吸収パネルを備える合成樹脂製容器であって、胴部の密度が１．３６９５ｇ／ｃｍ3以上であり、且つ、胴部における縦方向の結晶配向度と横方向の結晶配向度の合計値に対する横方向の結晶配向度の割合が４４％未満であることを特徴とする合成樹脂製容器である。本発明の一実施の形態である合成樹脂製容器１を図１に示す。
　図１に示す合成樹脂製容器１は、例えば果汁飲料やお茶等の飲料を収容する用途に用いられるものであり、円筒状の口部２、口部２に肩部３を介して連なる胴部４および胴部４の下端を閉塞する底部５を備えたボトル形状となっている。
　胴部４は断面略円形つまり略円筒形状となっており、胴部４を口部２に連ねる肩部３は略ドーム状に形成されている。
　胴部４には６枚の減圧吸収パネル６が周方向に等間隔に並べて設けられている。図中には３枚の減圧吸収パネル６のみが示されているが、胴部４の裏側にも同様に３枚の減圧吸収パネル６が設けられている。
　これらの減圧吸収パネル６は、それぞれ縦方向（図中上下方向）に延びる略長方形状に形成されるとともに胴部４の外周面に対して当該胴部４の内側に向けて陥没している。そして、これらの減圧吸収パネル６は、液体の充填後に口部２がキャップで閉じられた状態で液体（内容液）が冷却され、それに伴い合成樹脂製容器１の内部の減圧が生じたときに、胴部４の他の部分よりも優先的に陥没方向に変形して当該減圧を吸収することで胴部４の不正な変形を抑制することができるようになっている。
　なお、減圧吸収パネル６は上記構成に限らず、合成樹脂製容器１の内部に減圧が生じたときに当該減圧を吸収することができる構成であれば、その形状や枚数、配置等は種々変更可能である。特に、減圧吸収パネル６は、合成樹脂製容器１の内部に液体が充填されても、胴部４の径方向外側に向けて膨出変形しない構成とすることができる。すなわち、エアブロー成形により形成される容器では、減圧吸収効果を高めるために、減圧吸収パネルを内容液が充填されると膨出変形するように構成するのが一般的であるが、液体ブロー成形により形成される容器では、内容液の充填と容器の成形とが同時に行われるため内容液の充填時に減圧吸収パネルが膨出変形することはないので、減圧吸収パネルとして膨出変形しないより簡素な構成のものを採用することができる。
　肩部３と胴部４との間には、胴部４を補強するとともに減圧吸収パネル６の変形が肩部３の側に進行することを防止するために、２本の上側環状凹リブ７が上下に並べて設けられている。同様に、胴部４と底部５との間には、胴部４を補強するとともに減圧吸収パネル６の変形が底部５の側に進行することを防止するために、２本の下側環状凹リブ８が上下に並べて設けられている。さらに、口部２の下方部にはネックリング９が一体に設けられている。
　口部２は、当該口部２を閉塞するためのキャップ（不図示）が装着可能な構成となっている。図示する場合では、口部２の外周面にはねじ山２ａが設けられており、当該ねじ山２ａにキャップをねじ結合させることで口部２を閉塞することができるようになっている。なお、口部２にねじ山２ａに替えて環状突起を設け、アンダーカット形状を備えたキャップを口部２に打栓によって固定する構成とすることもできる。
　この合成樹脂製容器１は、例えばポリエチレンテレフタレート（ＰＥＴ）製とすることができる。つまり、合成樹脂製容器１はペットボトルに構成することができる。
　また、この合成樹脂製容器１は、本発明の一実施の形態である合成樹脂製容器の製造方法、すなわち熱可塑性樹脂により有底筒状（略試験管状）に形成されたプリフォーム（不図示）を液体ブロー成形することにより製造されたものとすることができる。より具体的には、合成樹脂製容器１は、熱可塑性樹脂により有底筒状に形成されたプリフォームを、延伸性を発現する所定温度にまで加熱し、当該加熱後のプリフォームに所定温度にまで加熱した液体を所定圧力で供給することにより製造することができる。この場合、液体ブロー成形時に加圧媒体として用いられる液体として最終的に製品として合成樹脂製容器１に収容される飲料等の内容液を用いることにより、成形後の合成樹脂製容器１への内容液の充填工程を省略して、その製造工程や製造装置の構成を簡略化することができる。
　この合成樹脂製容器１は、その胴部４の密度が１．３６９５ｇ／ｃｍ3以上であり、且つ、胴部４における縦方向（Machine Direction：ＭＤ方向）の結晶配向度と横方向（Transverse Direction：ＴＤ方向）の結晶配向度の合計値に対する当該横方向の結晶配向度の割合が４４％未満となっている。なお、結晶配向度の胴部４における縦方向とは図中上下方向であり、横方向とは胴部４の周方向に沿う方向である。
　このような構成とすることにより、この合成樹脂製容器１は、所定温度にまで加熱された内容液が熱充填されるとともに口部２にキャップが装着され、次いで冷却工程において当該内容液が例えば室温にまで冷却されることにより当該合成樹脂製容器１の内部に減圧が生じたとしても、当該減圧を減圧吸収パネル６によって吸収するとともに胴部４がそれ自体の強度によって減圧に抗して、内容液が熱充填されることにより生じる胴部４の減圧変形を十分に抑制することができる。
　上記した胴部４の密度は、ＪＩＳ　Ｋ　７１１２　密度こうばい管法に基づき測定した。また、胴部４の結晶配向度は、胴部４を試験片として切りだし、偏光ＡＴＲ　ＦＴ－ＩＲ法により測定して得られたＩＲスペクトルのうち、１４１０ｃｍ-1付近に見られるＰＥＴ分子鎖中のベンゼン環の面内変角振動と１３４０ｃｍ-1付近に見られるＣＨ2縦ゆれ振動の吸光度の比率により算出した。なお、結晶配向度は、前記試験片の内面側から測定した値と外面側から測定した値の平均値としている。
　胴部４の密度および胴部４における縦方向の結晶配向度と横方向の結晶配向度の合計値に対する当該横方向の結晶配向度の割合は、例えば、プリフォームの形状、ブロー成形によるプリフォームの縦方向および横方向への延伸倍率、プリフォームの加熱温度、供給する液体の温度、成形型の温度、ブロータイム等の条件を種々変更することにより上記範囲に設定される。
　本発明の効果を検証するために、それぞれ液体ブロー成形により図１に示すのと同一の内容量５００ｍｌ用のボトル形状に形成されるとともに、胴部の密度および胴部における縦方向の結晶配向度と横方向の結晶配向度が互いに相違するＮＯ１～１１の１１種類の合成樹脂製容器を用意し、これらの合成樹脂製容器について内容液が熱充填されることにより生じる胴部の減圧変形の有無について評価した。なお、合成樹脂製容器はポリエチレンテレフタレート製とし、液体ブロー成形の際にプリフォームに充填する液体の温度は８５℃とした。また、液体ブロー成形後に口部にキャップを装着し、その後、室温にまで冷却した後に胴部の減圧変形の有無についての評価を行った。
　胴部変形の評価は、ノギス等の測定装置を用いて胴部の外径寸法を、その周方向に等間隔にずれる３方向について測定し、これら３方向における胴部の外径寸法の最大値と最小値との差を楕円度とし、この楕円度が上記３方向における胴部の外径寸法の平均値に対して５％未満であれば胴部の変形が十分に抑制されていると判断して○の評価とし、楕円度が上記３方向における胴部の外径寸法の平均値に対して５％以上であれば胴部の変形が十分に抑制されていないと判断して×の評価とした。なお、本実施例においては、胴部の３箇所の外径寸法を、それぞれ隣り合う減圧吸収パネルの間の柱状の部分において測定した。その評価結果を表１に示す。
Figure JPOXMLDOC01-appb-T000001
　表１に示すように、胴部の密度が１．３６９５ｇ／ｃｍ3以上であり、且つ、胴部における縦（ＭＤ）方向の結晶配向度と横（ＴＤ）方向の結晶配向度の合計値に対する当該横（ＴＤ）方向の結晶配向度の割合が４４％未満となるＮＯ２～４、６～１１の合成樹脂製容器（本発明の実施例の容器）は何れも胴部の変形が少なく、その評価は○であった。
　これに対し、胴部の密度が１．３６８１ｇ／ｃｍ3つまり１．３６９５ｇ／ｃｍ3未満となったＮＯ１の合成樹脂製容器（比較例の容器）と、胴部における縦（ＭＤ）方向の結晶配向度と横（ＴＤ）方向の結晶配向度の合計値に対する当該横（ＴＤ）方向の結晶配向度の割合が４４．１９％つまり４４％以上となったＮＯ５の合成樹脂製容器（比較例の容器）は、胴部の変形が大きく、その評価は×であった。
　これらの結果から、本願発明の合成樹脂製容器のように、胴部の密度を１．３６９５ｇ／ｃｍ3以上とし、且つ、胴部における縦方向の結晶配向度と横方向の結晶配向度の合計値に対する当該横方向の結晶配向度の割合を４４％未満とすることにより、内容液が熱充填されることにより胴部に生じる減圧変形を十分に抑制できることが確認できた。
　本発明は前記実施の形態に記載の構成に限定されるものではなく、その要旨を逸脱しない範囲で種々変更可能であることはいうまでもない。
　例えば、前記実施の形態においては、本発明の合成樹脂製容器１として図１に示す形状のものを例示したが、口部２および胴部４を有するボトル形状であれば、合成樹脂製容器１の形状、容量ないし大きさは種々変更可能である。
　また、前記実施の形態においては、本発明の合成樹脂製容器１をポリエチレンテレフタレート製のものとしたが、これに限らず、他の合成樹脂材料により形成されたものとすることもできる。
　さらに、本願発明の合成樹脂製容器１の構成は、エアブロー成形により形成される合成樹脂製容器に適用できる場合も考えられる。
１　　合成樹脂製容器
２　　口部
２ａ　ねじ山
３　　肩部
４　　胴部
５　　底部
６　　減圧吸収パネル
７　　上側環状凹リブ
８　　下側環状凹リブ
９　　ネックリング

Claims (5)

  1. 　口部と胴部とを備えるボトル形状に形成されるとともに前記胴部に減圧吸収パネルを備える合成樹脂製容器であって、
    　前記胴部の密度が１．３６９５ｇ／ｃｍ3以上であり、且つ、前記胴部における縦方向の結晶配向度と横方向の結晶配向度の合計値に対する前記横方向の結晶配向度の割合が４４％未満であることを特徴とする合成樹脂製容器。
  2. 　前記胴部が断面略円形に形成されている、請求項１に記載の合成樹脂製容器。
  3. 　前記胴部に６枚の前記減圧吸収パネルが周方向に等間隔に並べて設けられている、請求項１または２に記載の合成樹脂製容器。
  4. 　ポリエチレンテレフタレート製である、請求項１～３の何れか１項に記載の合成樹脂製容器。
  5. 　熱可塑性樹脂により有底筒状に形成されたプリフォームに、所定温度にまで加熱した液体を所定圧力で供給することにより当該プリフォームを液体ブロー成形して、請求項１～４に記載の合成樹脂製容器を製造することを特徴とする合成樹脂製容器の製造方法。
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US10934048B2 (en) 2021-03-02
EP3342723A4 (en) 2019-04-24
US20180265242A1 (en) 2018-09-20
JP6588275B2 (ja) 2019-10-09
EP3342723B1 (en) 2021-11-10
EP3342723A1 (en) 2018-07-04
JP2017043407A (ja) 2017-03-02
CN107922077B (zh) 2020-07-03
CN107922077A (zh) 2018-04-17

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