WO2011024694A1 - 合成樹脂製壜体及びその製造方法 - Google Patents
合成樹脂製壜体及びその製造方法 Download PDFInfo
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- WO2011024694A1 WO2011024694A1 PCT/JP2010/063972 JP2010063972W WO2011024694A1 WO 2011024694 A1 WO2011024694 A1 WO 2011024694A1 JP 2010063972 W JP2010063972 W JP 2010063972W WO 2011024694 A1 WO2011024694 A1 WO 2011024694A1
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- temperature
- blow molding
- crystallization
- synthetic resin
- mouth tube
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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
- B29C49/0005—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
- B29C49/08—Biaxial stretching during 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
- B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
- B29C49/12—Stretching rods
-
- 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
- B65D1/023—Neck construction
-
- 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
- B29C2049/7864—Temperature of the mould
- B29C2049/78645—Temperature of the mould characterised by temperature values or ranges
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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
- B29C2793/00—Shaping techniques involving a cutting or machining operation
- B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
-
- 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
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- 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
-
- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0041—Crystalline
-
- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0063—Density
-
- 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
- B29L2031/716—Bottles of the wide mouth type, i.e. the diameters of the bottle opening and its body are substantially identical
-
- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/139—Open-ended, self-supporting conduit, cylinder, or tube-type article
Definitions
- the present invention relates to a synthetic resin casing having a wide-mouthed tubular portion made of a polyethylene terephthalate-based resin by biaxial stretch blow molding and a method for producing the same.
- Patent Document 1 discloses a biaxially stretched blow molded casing (hereinafter referred to as a polyethylene terephthalate (PET) resin) used for products requiring heat treatment such as filling at high temperature or sterilization, such as tea and fruit juice beverages (hereinafter, It may be described as a plastic bottle.)
- PET polyethylene terephthalate
- heat-resistant deformation is improved by thermal crystallization treatment for PET bottles for products with a temperature of about 80-90 ° C (hereinafter referred to as high-temperature filling) or heat treatment processes for tea, fruit juice beverages, etc.
- a so-called heat-resistant mouth tube portion is used.
- a thermal crystallization treatment method for example, a method using a hot air nozzle as described in Patent Document 2 and a method using an infrared heater are known.
- the shape of the mouth portion of the preform is normally the mouth tube portion of the housing without stretching the mouth portion of the preform. Under such high temperatures, the mouth tube part may shrink or deform, and the basic performance required as a seal with a cap may be impaired. It is necessary to impart heat resistance by thermal crystallization.
- a technical problem of the present invention is to create a casing structure or a manufacturing method for improving the heat resistance or productivity of a wide-mouth bottle by the above-described PET resin-based biaxial stretch blow molding.
- the main configuration according to the casing of the present invention is as follows.
- the mouth tube part is formed by expanding the diameter of the test tubular preform in the same manner as the body part by the stretching process of biaxial stretch blow molding, By setting the stretching and the mold temperature to a predetermined temperature in the thermal crystallization temperature region of the PET resin, the density of the mouthpiece portion is set to 1.368 g / cm 3 or more.
- the mouth tube portion of the casing having the above-described structure is oriented and crystallized by a stretching process in the same manner as the body portion, and the crystallites generated by this orientation crystallization are used as a nucleus and set to a predetermined temperature in the thermal crystallization temperature region of the PET resin.
- the crystallization is further promoted uniformly and sufficiently so that the density is 1.368 g / cm 3 or more. Even if the wall thickness of the mouthpiece portion is relatively thin The heat resistance in the high temperature filling process is exhibited.
- the density of the mouthpiece portion having the above-described configuration is the same as that of the biaxial stretch blow molding because of the two requirements that the mouthpiece portion is stretch-molded and formed by a mold set at a relatively high temperature. Crystallization can be progressed uniformly to increase the density to 1.368 g / cm 3 or more.
- the draw ratio of the mouth tube portion is smaller than that of the body portion, etc., the density cannot be sufficiently increased only by stretching.
- heating from the die even when the die temperature is high It is difficult to increase the density in a short time without impairing the productivity of biaxial stretch blow molding.
- the thermal crystallization temperature range of the PET-based resin is a temperature range in which an exothermic peak accompanying crystallization appears in a temperature range of about 80 to 180 ° C. by constant-speed heating measurement using differential scanning calorimetry (DSC). Indicates.
- the other structure which concerns on the housing of this invention is that the density of a mouth-tube part shall be 1.370 g / cm ⁇ 3 > or more in the said main structure.
- a synthetic resin casing made of biaxial stretch blow molding made of PET resin The mouth tube part is formed by expanding the diameter of the test tubular preform in the same manner as the body part by the stretching process of biaxial stretch blow molding, Elongation and the exothermic peak accompanying crystallization in constant-speed heating measurement of differential scanning calorimetry (DSC) of the mouthpiece by setting the mold temperature to a predetermined temperature in the thermal crystallization temperature region of the PET resin
- DSC differential scanning calorimetry
- / ⁇ Hm) is made smaller than 0.1. is there.
- the crystallization enthalpy ⁇ Hc and the melting enthalpy ⁇ Hm are used as indices indicating the degree of progress of crystallization in the mouthpiece.
- the method of measuring ⁇ Hc and ⁇ Hm by differential scanning calorimetry is as follows. (1) Collect a sample from the mouth tube and set it on the sample pan. (2) The temperature is raised from 20 ° C. to 300 ° C. at a constant rate (10 ° C./min), and ⁇ Hc is about 170 to 260 from the area of the exothermic peak accompanying crystallization appearing in the temperature range of about 80 to 180 ° C. ⁇ Hm is calculated from the area of the endothermic peak accompanying melting that appears in the temperature range of ° C.
- the average thickness of the mouth tube portion is in the range of 0.6 to 1.8 mm
- the casing of the present invention is the thickness of the mouth tube portion. Even when the thickness is relatively thin and in the range of 0.6 to 1.8 mm, sufficient heat resistance can be exhibited.
- the wall thickness of the mouthpiece part of the conventional normal PET bottle is about 2 mm.
- the main configuration according to the manufacturing method of the present invention is as follows. It is a manufacturing method of a synthetic resin casing by biaxial stretch blow molding made of PET resin, Using a test tubular preform, Set the mold temperature of the part that forms the mouth tube portion of the casing of the blow molding mold to a predetermined temperature in the thermal crystallization temperature region, Like the body part, the mouth tube part is formed by expanding the diameter of the preheated test tubular preform by a stretching process of biaxial stretch blow molding, It is said that the setting of the draw ratio and the mold temperature in the mouthpiece part is adjusted so that the density, which is an index of the degree of progress of crystallization in the mouthpiece part, becomes a predetermined value or more.
- the combination of the draw ratio and the mold temperature is appropriately selected in consideration of the combination of the diameter of the mouthpiece portion and the diameter of the preform, the productivity of preform injection molding, the productivity of biaxial stretch blow molding, etc. can do.
- the other main configuration relating to the production method of the present invention is as follows: A method for producing a synthetic resin casing by biaxial stretch blow molding made of PET resin, Using a test tubular preform, Set the mold temperature of the portion forming the mouth tube portion of the casing of the blow molding mold to a predetermined temperature in the thermal crystallization temperature region of the PET-based resin, Like the body part, the mouth tube part is formed by expanding the diameter of the preheated test tubular preform by a stretching process of biaxial stretch blow molding, The setting of the draw ratio and mold temperature in the mouth tube part is calculated from the exothermic peak accompanying crystallization in the constant-speed heating measurement of differential scanning calorimetry (DSC), which is an index of the degree of progress of crystallization in the mouth tube part.
- DSC differential scanning calorimetry
- the ratio of the enthalpy of fusion ⁇ Hm calculated from the absolute value of the crystallization enthalpy ⁇ Hc and the endothermic peak accompanying melting (
- the above configuration uses the crystallization enthalpy ⁇ Hc as an index representing the degree of progress of crystallization in the mouthpiece.
- Another configuration according to the manufacturing method of the present invention is to set the mold temperature of the portion forming the mouth tube portion to a temperature of 135 ° C. or higher.
- the extent to which the mold temperature is raised can be appropriately determined in consideration of the draw ratio of the mouthpiece part and the productivity of biaxial stretch blow molding, but the draw ratio of the mouthpiece part. Even if (longitudinal stretch ratio ⁇ transverse stretch ratio) is about several times, heat resistance can be exhibited at a high temperature in the high temperature filling step by setting the mold temperature to 135 ° C. or higher.
- the conventional thermal crystallization treatment of the mouthpiece portion is performed at a high temperature of about 200 ° C. using an infrared heater or the like, but according to the manufacturing method of the present invention, a relatively low temperature of about 135 ° C. is used. Crystallization can proceed in a short time at temperature.
- Still another configuration according to the manufacturing method of the present invention relates to a method for obtaining a casing which is a final molded product by extending and forming a mouth tube portion of a casing from a test tubular preform by biaxial stretch blow molding.
- the preform is shaped to have a mouth with a neck ring at the upper end of the cylindrical body, and the preform is fixed in the mold using this mouth, and the body and bottom of the preform are Biaxially extending to form the mouth tube portion, shoulder portion, body portion, and bottom portion of the housing, and thereafter including the mouth portion of the preform integrally connected above the upper end surface of the mouth tube portion of the housing It is said that a part is excised.
- a PET resin is mainly used.
- a copolymer polyester mainly containing an ethylene terephthalate unit and containing other polyester units is also used.
- a small amount of resin such as nylon resin and polyethylene naphthalate resin can be blended and used.
- the component for forming the copolyester examples include dicarboxylic acid components such as isophthalic acid, naphthalene 2,6 dicarboxylic acid, and adipic acid, propylene glycol, 1,4 butanediol, tetramethylene glycol, neopentyl glycol, cyclohexanedimethanol, A glycol component such as diethylene glycol can be mentioned.
- the PET resin casing of the present invention is, for example, PET resin / nylon resin / PET resin for improving heat resistance and gas barrier properties. It may have an intermediate layer such as nylon resin.
- the present invention is a synthetic resin casing having the above-described configuration and a method for manufacturing the same, and has the following effects.
- the mouth tube portion of the casing is oriented and crystallized by biaxial stretching in the same manner as the trunk portion, and the microcrystals generated by the orientation crystallization are formed as nuclei.
- the crystallization is uniformly progressed by the mold temperature set to a higher temperature, and the density is 1.368 g / cm 3 or more, or the absolute value of the crystallization enthalpy ⁇ Hc and the ratio of the melting enthalpy ⁇ Hm (
- the stretching and mold temperature can be adjusted. Combined with the two requirements of high, the crystallization of the mouth tube part is advanced at the same time as the biaxial stretch blow molding with high productivity without using the thermal crystallization process step with an infrared heater or the like as in the past. Heat resistance can be imparted.
- FIG. 3 It is a front view which shows one Example of the synthetic resin casings of this invention. It is a front view which shows an example of the intermediate molded product of the housing of FIG. 3 is a table 1 showing the relationship between the mold temperature and the density of the mouthpiece, the crystallization enthalpy or the dimensional change rate. It is a graph which shows the example of DSC measurement.
- FIG. 1 is a front view showing an embodiment of the synthetic resin casing of the present invention
- FIG. 2 is a front view showing an example of an intermediate molded product that is a precursor of the casing of FIG.
- This casing 1 is made of biaxially stretched blow molding made of PET resin, and has a wide-mouthed tube portion 2, a shoulder portion 3, a body portion 4 and a bottom portion 5.
- Five circumferential groove ribs 6 for increasing the bending strength are arranged.
- the main dimensions and capacity of the housing 1 are as follows. Mouth portion outer diameter 59.61 mm, Mouth portion average wall thickness 1.05 mm, trunk portion outer diameter 90.5 mm, trunk portion average wall thickness 0.43 mm, total height 147.76 mm, capacity 725 ml
- a preform 21 drawn by a two-dot chain line in a portion from the body portion 24 to the bottom portion 25 is biaxially stretch blow-molded to form the intermediate molded product 11, After that, the cut portion C located at the upper part of the intermediate molded product 11 is cut off to manufacture the housing 1.
- the manufacturing method of the present invention is characterized in that the mouth tube portion 2 is stretched in the lengthwise and lateral directions together with the body portion 4 in the stretching step, and the temperature of the mold portion forming the mouth tube portion 2 is set to be relatively high.
- the preform 21 uses a preform that has been generally used in the past.
- the preform 21 is a test tube as a whole, and a mouth portion 22 in which a thread 22b is disposed at the upper portion and a neck ring 22e is disposed at the lower portion.
- the main dimensions of the preform 21 are as follows. Body thickness: 4.2mm, body diameter: 33mm, neck height: 97mm
- the intermediate molded product 11 has a shape in which a casing 1 part to be a final molded product and a cut portion C to be cut are integrally connected, and a biaxial stretch blow molding is formed immediately below the mouth portion 22 of the preform 21. It has a taper-tube-shaped extending connecting portion 13 formed by expanding the upper end portion of the body portion 24 of the preform 21, and the extending connecting portion 13 includes the mouth portion 22 of the preform 21 and the mouth tube of the casing 1.
- the part 2 is integrally connected.
- a guide circumferential groove 14 is formed at the lower end portion of the extending connection portion 13 so that the excision portion C can be excised smoothly.
- the diameter expansion of the mouth tube portion 2 can be smoothly achieved by the tapered tube-shaped extending connection portion 13.
- the mouth tube part 2 of the housing 1 part is a part stretched longitudinally and laterally together with the body part 4 in the biaxial stretching blow process, and the value of the longitudinal and lateral stretching ratio in this embodiment is about 4 times. is there. Incidentally, the draw ratio of the trunk
- Table 1 in FIG. 3 shows the mouthpiece when the mold temperature of the portion forming the mouthpiece portion 2 of the casing 1 is 110 ° C., 118.5 ° C., 135 ° C., 149 ° C., and 167 ° C.
- / melting enthalpy ⁇ Hm) of part 2 are shown.
- the measurement conditions of each physical property are as follows. (1) Density is sampled from each location of the lip portion 2a, the screw portion 2b, the bead lower portion 2d, and the neck ring portion 2e (see FIG. 1) of the mouth tube portion 2, and the density is measured according to the measuring method of JISK7112.
- Crystallization enthalpy ⁇ Hc and melting enthalpy ⁇ Hm are sampled from each part of the mouthpiece part 2 in the same manner as the density, set in the sample pan, and from 20 ° C. to 300 ° C. at a constant rate (10 ° C./min).
- ⁇ Hc is obtained from the area of the exothermic peak accompanying crystallization appearing in the temperature range of about 80 to 180 ° C. by raising the temperature
- ⁇ Hm is obtained from the area of the endothermic peak accompanying melting appearing in the temperature range of about 170 to 260 ° C.
- the average value was calculated.
- the rate of dimensional change at higher temperatures is determined by conducting a heat resistance test in which 90 ° C.
- the rate of change in outer diameter before and after the filling is calculated as the mouthpiece 2
- the average value was calculated at each location of the lip portion 2a, screw portion 2b, bead lower portion 2d, and neck ring portion 2e.
- the dimensional change rate needs to be less than 0.25% in order to exhibit the performance as the heat resistant mouth tube part. Further, when the content is 0.2% or less, the sealing performance is more reliably exhibited.
- A is a measurement result of a sample taken from the mouthpiece portion 1 having a mold temperature of 118.5 ° C. in Table 1 of FIG. 3, and B is a mold temperature of 149 ° C. It is a measurement result of the sample extract
- measurement result A when the temperature is increased from 20 ° C. at a constant rate (10 ° C./min), crystallization starts from around 80 ° C., and this peak ends at around 150 ° C. When the temperature is further increased, melting of the crystal starts from around 190 ° C., and this peak ends at around 260 ° C. Then, the crystallization enthalpy ⁇ Hc and the melting enthalpy ⁇ Hm can be calculated from the area of the peak (the area indicated by hatching in the figure).
- the crystallization enthalpy ⁇ Hc is based on an exothermic peak and is usually described as a minus value.
- is used as an indicator of the progress of crystallization.
- the measurement results in Table 1 are displayed as 0. For this reason, DSC measurement for a sample at 167 ° C. was omitted.
- the mold temperature is increased in the range of 110 ° C. to 167 ° C.
- the density increases and the dimensional change rate of the mouth tube portion decreases.
- the mold temperature is raised in the range of 110 ° C. to 149 ° C.
- the dimensional change rate of the outer diameter of the mouth tube portion 2 is less than 0.25%, which is a heat resistance standard.
- the standard for the heat-resistant mouthpiece is to set 1.368 g / cm 3 or more and
- the draw ratio of the mouth tube portion is about 4 times as in this embodiment, the above-mentioned standard can be achieved by setting the mold temperature to 135 ° C. or higher.
- embodiment of this invention is not limited to the said Example.
- a round casing having a capacity of 725 ml has been described.
- the present invention can also be applied to a rectangular casing, a smaller, and a larger casing.
- the case made of a PET resin was described.
- the PET resin is copolymerized or blended with other components as long as the essence of the PET resin is not impaired. be able to.
- the shape of the excision portion C shown in FIG. 2 can also be an appropriate shape in consideration of the productivity of the preform and the equipment and productivity related to the excision.
- the PET resin-based casing by the biaxial stretch blow molding of the present invention can realize a wide-mouthed heat-resistant tube portion while suppressing an increase in material cost and a decrease in productivity. It is expected to be used widely for applications that require high-temperature filling.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
またプリフォームの口部の口径を大きくすると、射出成形機の金型用盤面の制約から、一度の射出成形により成形可能なプリフォームの個数が少なくなると云う、生産性の低下の問題もある。
PET系樹脂製の2軸延伸ブロー成形による合成樹脂製壜体において、
口筒部は、胴部と同様に試験管状のプリフォームの径を2軸延伸ブロー成形の延伸工程により拡径して形成したもので、
前記延伸と、金型温度を前記PET系樹脂の熱結晶化温度領域の所定の温度に設定することにより、口筒部の密度を1.368g/cm3以上とする、と云うものである。
ここで、口筒部の延伸倍率は胴部等に比較して小さくなるので、延伸だけでは十分に密度を高くすることはできないし、一方、金型温度を高温にしても金型からの加熱だけでは、2軸延伸ブロー成形の生産性を損なうことなく、短時間で密度を高くすることは困難である。
PET系樹脂製の2軸延伸ブロー成形による合成樹脂製壜体において、
口筒部は、胴部と同様に試験管状のプリフォームの径を2軸延伸ブロー成形の延伸工程により拡径して形成したもので、
延伸と、金型温度をPET系樹脂の熱結晶化温度領域の所定の温度に設定することにより、口筒部の示差走査熱量測定(DSC)の定速昇温測定における結晶化に伴う発熱ピークから算出される結晶化エンタルピー△Hcの絶対値及び、融解に伴う吸熱ピークから算出される融解エンタルピー△Hmの比率(|△Hc|/△Hm)を0.1より小さくする、と云うものである。
ここで、示差走査熱量測定(DSC)によるこの△Hc、△Hmの測定方法は次のようなものである。
(1)口筒部からサンプルを採取して試料パンにセットする。
(2)一定速度(10℃/分)で20℃から300℃まで昇温させて、略80~180℃の温度範囲に現れる結晶化に伴う発熱ピークの面積から△Hcを、略170~260℃の温度範囲に現れる融解に伴う吸熱ピークの面積から△Hmを算出する。
なお、従来の通常のペットボトルの口筒部の肉厚は2mm程度である。
PET系樹脂製の2軸延伸ブロー成形による合成樹脂製壜体の製造方法であり、
試験管状のプリフォームを用い、
ブロー成形金型の壜体の口筒部を形成する部分の金型温度を熱結晶化温度領域の所定の温度に設定し、
胴部と同様に口筒部を、予熱した試験管状のプリフォームの径を2軸延伸ブロー成形の延伸工程により拡径して形成し、
口筒部における延伸倍率と金型温度の設定を、口筒部の結晶化の進行程度の指標である密度が所定の値以上になるように調整する、と云うものである。
PET系樹脂製の2軸延伸ブロー成形による合成樹脂製壜体の製造方法であり、
試験管状のプリフォームを用い、
ブロー成形金型の壜体の口筒部を形成する部分の金型温度をPET系樹脂の熱結晶化温度領域の所定の温度に設定し、
胴部と同様に口筒部を、予熱した試験管状のプリフォームの径を2軸延伸ブロー成形の延伸工程により拡径して形成し、
口筒部における延伸倍率と金型温度の設定を、口筒部の結晶化の進行程度の指標である示差走査熱量測定(DSC)の定速昇温測定における結晶化に伴う発熱ピークから算出される結晶化エンタルピー△Hcの絶対値及び、融解に伴う吸熱ピークから算出される融解エンタルピー△Hmの比率(|△Hc|/△Hm)が所定の値以下となるように調整する、と云うものである。
ここで、従来の口筒部の熱結晶化処理は赤外線ヒータ等を用いて200℃程度の高温で実施されるものであるが、本発明の製造方法によれば比較的低温の135℃程度の温度で結晶化を短時間に進行させることが可能である。
プリフォームを円筒状の胴部の上端部にネックリングを配設した口部を有する形状とし、この口部を利用してプリフォームを金型内に固定し、プリフォームの胴部と底部を2軸延伸して、壜体の口筒部、肩部、胴部、および底部を形成し、その後壜体の口筒部の上端面の上方に一体連結される前記プリフォームの口部を含む部分を切除する、と云うものである。
まず、本発明の主たる構成を有する合成樹脂製壜体にあっては、壜体の口筒部は胴部と同様に2軸延伸により配向結晶化し、この配向結晶化により生成した微結晶を核として、さらに高温に設定した金型温度により結晶化を均一に進行させて、密度を1.368g/cm3以上、あるいは結晶化エンタルピー△Hcの絶対値及び融解エンタルピー△Hmの比率(|△Hc|/△Hm)を0.1より小さくしたものであり、肉厚が比較的薄肉であっても高温充填工程等の高温下にあって、収縮や変形を抑制することができ、耐熱性を付与することができる。
図1は本発明の合成樹脂製壜体の一実施例を示す正面図であり、また図2は図1の壜体の前駆体である中間成形品の一例を示す正面図である。
この壜体1はPET樹脂製の2軸延伸ブロー成形によるものであり、広口の口筒部2、肩部3、胴部4そして底部5を有し、胴部4には周壁の剛性及び座屈強度を高くするための周溝リブ6が5ケ配設されている。
口筒部外径59.61mm、口筒部平均肉厚1.05mm、胴部外径90.5mm、胴部平均肉厚0.43mm、全高さ147.76mm、容量725ml
まず、本発明の製造方法の概略は、図2中、胴部24から底部25にかけての部分を二点鎖線で描いたプリフォーム21を2軸延伸ブロー成形して中間成形品11を成形し、その後この中間成形品11の上部に位置する切除部Cを切除して壜体1を製造する、と云うものである。そして本発明の製造方法の特徴は口筒部2を、延伸工程で胴部4と共に縦横に延伸して成形すると共に、この口筒部2を形成する金型部分の温度を比較的高く設定し、これら両要件により口筒部2の結晶化を十分に進行させる点にある。
胴部平均肉厚4.2mm、胴部外径33mm、ネック下高さ97mm
また、この延伸連結部13の下端部には切除部分Cの切除をスムーズに実施できるようにガイド周溝14が形成されている。
また、テーパー筒状の延伸連結部13により口筒部2の拡径状の延伸をスムーズに達成することができる。
また、本実施例における2軸延伸ブロー成形の主たる成形条件では、プリフォーム11の予熱温度を120℃とし、胴部4、底部5を形成する部分の平均的な金型温度を130℃としている。
ここで、各物性の測定条件は次の通りである。
(1)密度は、口筒部2のリップ部2a、ネジ部2b、ビード下部2d、ネックリング部2e(図1参照)の各箇所からサンプリングし、JISK7112の測定方法に沿って密度を測定し、平均値を算出した。
(2)結晶化エンタルピー△Hc及び融解エンタルピー△Hmは密度と同様に口筒部2の各箇所からサンプリングして試料パンにセットし、一定速度(10℃/分)で20℃から300℃まで昇温させて、略80~180℃の温度範囲に現れる結晶化に伴う発熱ピークの面積から△Hcを、略170~260℃の温度範囲に現れる融解に伴う吸熱ピークの面積から△Hmを求め、平均値を算出した。
(3)高温化での寸法変化率は、高温充填工程を想定して壜体内に90℃の水を充填する耐熱試験を実施し、その充填前後の外径の変化率を、口筒部2のリップ部2a、ネジ部2b、ビード下部2d、ネックリング部2eの各箇所において測定し、平均値を算出した。
ここで、上記口筒部の外径の変化率とキャップによるシール性の関係を検討すると、耐熱口筒部としての性能が発揮されるためには寸法変化率を0.25%未満とする必要があり、さらに0.2%以下とすることにより、より確実にシール性が発揮される。
測定結果Aについてみると、20℃から一定速度(10℃/分)で昇温すると、80℃近傍から結晶化が開始し、150℃近傍でこのピークが終了する。さらに昇温を続けると190℃近傍から結晶の融解が開始し、260℃近傍でこのピークが終了する。そして、上記ピークの面積(図中ハッチングで示した部分の面積)から結晶化エンタルピー△Hc及び融解エンタルピー△Hmを算出することができる。
なお、結晶化エンタルピー△Hcは発熱ピークに基づくものであり、通常マイナスで記載するが、結晶化の進行の指標として本発明では絶対値である|△Hc|を用いている。
また、135℃、149℃において今回のDSC測定条件では発熱ピークが現出していないため、表1での測定結果は0として表示している。なおこのため167℃のサンプルについてのDSC測定は割愛した。
(1)110℃~167℃の範囲で金型温度を高くすると、密度が大きくなり、口筒部の寸法変化率が小さくなる。
(2)110℃~149℃の範囲で金型温度を高くすると、|△Hc|が小さくなり、口筒部の寸法変化率が小さくなる。
(3)上述したように、キャップによるシール性の保持と云う観点から、口筒部2の外径の寸法変化率が0.25%未満であることが耐熱性の基準となり、この基準から密度を1.368g/cm3以上とする、また|△Hc|/△Hmを0.1より小さくすると云うのが耐熱性口筒部の基準となる。
(4)また、口筒部の延伸倍率が本実施例のように4倍程度の場合には金型温度を135℃以上とすることにより上記基準を達成することができる。
たとえば上記実施例では容量が725mlの丸形壜体について説明したが、角形壜体、またさらに小型、さらに大型の壜体についても適用することができる。
また、上記実施例ではPET樹脂製の壜体について説明したが、前述したように、PET樹脂の本質が損なわれない範囲で、他の成分を共重合、あるいはブレンドしたPET系樹脂にも適用することができる。
また、図2に示した切除部分Cの形状もプリフォームの生産性や、切除に係る設備や生産性を考慮して、適宜の形状とすることができる。
2 ;口筒部
2a;リップ部
2b;ネジ部
2c;ビード部
2d;ビード下部
2e;ネックリング
3 ;肩部
4 ;胴部
5 ;底部
6 ;周溝リブ
11;中間成形品
13;延伸連結部
14;ガイド周溝
21;プリフォーム
22;口部
22b;螺条
22e;ネックリング
24;胴部
25;底部
C ;切除部分
Claims (8)
- ポリエチレンテレフタレート系樹脂製の2軸延伸ブロー成形による合成樹脂製壜体であり、口筒部は、胴部と同様に試験管状のプリフォームの径を前記2軸延伸ブロー成形の延伸工程により拡径して形成したもので、前記延伸と金型温度を前記ポリエチレンテレフタレート系樹脂の熱結晶化温度領域の所定の温度に設定することにより、前記口筒部の密度を1.368g/cm3以上としたことを特徴とする合成樹脂製壜体。
- 口筒部の密度を1.370g/cm3以上とした請求項1記載の合成樹脂製壜体。
- ポリエチレンテレフタレート系樹脂製の2軸延伸ブロー成形による合成樹脂製壜体であり、口筒部は、胴部と同様に試験管状のプリフォームの径を前記2軸延伸ブロー成形の延伸工程により拡径して形成したもので、前記延伸と金型温度を前記ポリエチレンテレフタレート系樹脂の熱結晶化温度領域の所定の温度に設定することにより、前記口筒部の示差走査熱量測定(DSC)の定速昇温測定における結晶化に伴う発熱ピークから算出される結晶化エンタルピー△Hcの絶対値及び、融解に伴う吸熱ピークから算出される融解エンタルピー△Hmの比率(|△Hc|/△Hm)が0.1より小さくしたことを特徴とする合成樹脂製壜体。
- 口筒部の平均肉厚を0.6~1.8mmの範囲とした請求項1、2または3記載の合成樹脂製壜体。
- ポリエチレンテレフタレート系樹脂製の2軸延伸ブロー成形による合成樹脂製壜体の製造方法であり、試験管状のプリフォームを用い、ブロー成形金型の前記壜体の口筒部を形成する部分の金型温度を前記ポリエチレンテレフタレート系樹脂の熱結晶化温度領域の所定の温度に設定し、胴部と同様に口筒部を、予熱した試験管状のプリフォームの径を2軸延伸ブロー成形の延伸工程により拡径して形成し、前記口筒部に係る延伸倍率と金型温度の設定を、口筒部の結晶化の進行程度の指標である密度が所定の値以上になるように調整することを特徴とする合成樹脂製壜体の製造方法。
- ポリエチレンテレフタレート系樹脂製の2軸延伸ブロー成形による合成樹脂製壜体の製造方法であり、試験管状のプリフォームを用い、ブロー成形金型の前記壜体の口筒部を形成する部分の金型温度を前記ポリエチレンテレフタレート系樹脂の熱結晶化温度領域の所定の温度に設定し、胴部と同様に口筒部を、予熱した試験管状のプリフォームの径を2軸延伸ブロー成形の延伸工程により拡径して形成し、前記口筒部に係る延伸倍率と金型温度の設定を、口筒部の結晶化の進行程度の指標である前記口筒部の示差走査熱量測定(DSC)の定速昇温測定における結晶化に伴う発熱ピークから算出される結晶化エンタルピー△Hcの絶対値及び、融解に伴う吸熱ピークから算出される融解エンタルピー△Hmの比率(|△Hc|/△Hm)が所定の値未満となるように調整することを特徴とする合成樹脂製壜体の製造方法。
- 口筒部を形成する部分の金型温度を135℃以上の温度に設定した、請求項5または6記載の合成樹脂製壜体の製造方法。
- プリフォームを円筒状の胴部の上端部にネックリングを配設した口部を有する形状とし、該口部を利用してプリフォームを金型内に固定し、前記プリフォームの胴部を2軸延伸して、壜体の口筒部、肩部、胴部、および底部を形成し、その後壜体の口筒部の上端面の上方に一体連結される前記プリフォームの口部を含む部分を切除する請求項5、6または7記載の合成樹脂製壜体の製造方法。
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| WO2013125401A1 (ja) | 2012-02-23 | 2013-08-29 | 日精エー・エス・ビー機械株式会社 | ブロー成形方法、ブロー成形型及びブロー成形容器 |
| US20150166213A1 (en) * | 2013-12-17 | 2015-06-18 | Han Young Kim | Pet bottle forming cutting guide |
| US10737822B2 (en) * | 2015-03-30 | 2020-08-11 | Ring Container Technologies, Llc | Container and method of manufacture |
| EP3769934B1 (en) * | 2015-04-30 | 2022-02-23 | Dai Nippon Printing Co., Ltd. | Aseptic container molding method and apparatus and aseptic filling method and apparatus |
| JP6588275B2 (ja) * | 2015-08-28 | 2019-10-09 | 株式会社吉野工業所 | 合成樹脂製容器の製造方法 |
| CN107225749A (zh) * | 2016-03-25 | 2017-10-03 | 上海紫江企业集团股份有限公司 | 广口瓶中间体的模具结构以及广口瓶的制造方法 |
| US10486891B2 (en) | 2016-12-02 | 2019-11-26 | S.C. Johnson & Son, Inc. | Plastic bottle for a pressurized dispensing system |
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| US4618515A (en) * | 1985-04-05 | 1986-10-21 | Continental Pet Technologies, Inc. | Polyester container with oriented, crystallized thread finish for hot fill applications and method of making same |
| US6555191B1 (en) * | 1998-07-30 | 2003-04-29 | Graham Packaging Company, L.P. | Wide mouth blow molded plastic container, method of making same, and preform used therein |
| US7531125B2 (en) * | 2003-08-25 | 2009-05-12 | Ring Container Technologies | Blow molded wide mouth pet container and method of manufacture |
| US20070289933A1 (en) * | 2006-06-19 | 2007-12-20 | Dan Weissmann | Wide mouth jar with integral scraper |
Also Published As
| Publication number | Publication date |
|---|---|
| US20120187068A1 (en) | 2012-07-26 |
| CA2769873A1 (en) | 2011-03-03 |
| AU2010287698B2 (en) | 2014-04-03 |
| JP5614609B2 (ja) | 2014-10-29 |
| JP2011051604A (ja) | 2011-03-17 |
| CA2769873C (en) | 2018-05-08 |
| CN102202863B (zh) | 2015-07-08 |
| US8980390B2 (en) | 2015-03-17 |
| CN102202863A (zh) | 2011-09-28 |
| AU2010287698A1 (en) | 2012-03-15 |
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