WO2018003790A1 - Récipient moulé par étirage-soufflage en polyester et son procédé de fabrication - Google Patents

Récipient moulé par étirage-soufflage en polyester et son procédé de fabrication Download PDF

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Publication number
WO2018003790A1
WO2018003790A1 PCT/JP2017/023551 JP2017023551W WO2018003790A1 WO 2018003790 A1 WO2018003790 A1 WO 2018003790A1 JP 2017023551 W JP2017023551 W JP 2017023551W WO 2018003790 A1 WO2018003790 A1 WO 2018003790A1
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WIPO (PCT)
Prior art keywords
blow
container
polyester
temperature
stretch
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PCT/JP2017/023551
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English (en)
Japanese (ja)
Inventor
温 小宮
玲太 石井
大樹 安川
友 山崎
友紀 栗原
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東洋製罐株式会社
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.)
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Priority claimed from JP2016137377A external-priority patent/JP6862698B2/ja
Priority claimed from JP2016225662A external-priority patent/JP2018083630A/ja
Application filed by 東洋製罐株式会社 filed Critical 東洋製罐株式会社
Priority to US16/313,779 priority Critical patent/US11040476B2/en
Priority to CN201780040407.9A priority patent/CN109415134B/zh
Priority to EP17820144.8A priority patent/EP3476756B1/fr
Publication of WO2018003790A1 publication Critical patent/WO2018003790A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/08—Biaxial stretching during blow-moulding
    • 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 thin stretched polyester stretch blow molded container and a method for producing the same, and more particularly, to a lightweight thin stretch polyester stretch blow molded container having heat resistance suitable for high temperature filling and a method for producing the same. About.
  • Polyester stretch blow molded containers formed by biaxial stretch blow molding of polyester preforms are widely used as containers for various beverages because they are excellent in transparency and light weight.
  • the heat resistant container has a problem that it becomes difficult to maintain heat resistance due to further thinning. In other words, when the contents are filled at a high temperature of 80 ° C. or higher, the container is greatly deformed, and its thinning is limited at present.
  • a means for heat-treating (heat fixing) the container after blow molding is widely adopted, but the average thickness of the container body is In a thin polyester stretch blow molded container that has been thinned to 280 ⁇ m or less, the container may be deformed by heating for heat setting, and it cannot be sufficiently crystallized by heat setting. When the contents were filled at a high temperature, deformation of the container could not be prevented, and as a result, the container body could not be sufficiently thinned.
  • Patent Document 1 discloses that in a dynamic viscoelasticity measurement, a tan ⁇ peak temperature is 113 ° C. or less and a tan ⁇ absolute value in the vertical direction of the container body.
  • a polyester container characterized in that is 0.18 or less has been proposed.
  • the polyester container exhibits excellent heat distortion resistance by blow stretching and heat setting so as to satisfy certain dynamic viscoelastic properties, for example, heat distortion resistance that can withstand high temperature sterilization treatment (retort treatment).
  • retort treatment high temperature sterilization treatment
  • Patent Document 1 is applied to a thick-walled polyester blow container, and the thinned and light-weight polyester blow container is used at the time of molding as described above. Since there exists a possibility that it may deform
  • an object of the present invention is to provide a stretch blow container made of polyester and a method for producing the same, in which the average thickness of the body portion is 280 ⁇ m or less, and the deformation that occurs during high temperature filling of the contents is effectively suppressed. is there.
  • the polyester stretch blow container of the first aspect of the present invention is a polyester stretch blow container having a trunk average thickness of 280 ⁇ m or less, and the dynamic viscoelasticity measurement is performed in the axial direction of the trunk central portion. Is provided with a tan ⁇ peak value of 0.23 to 0.29, and a tan ⁇ peak temperature at the peak value of 111 to 118 ° C.
  • a polyester stretch blow container characterized in that the tan ⁇ peak value is less than 0.25 and the peak temperature of tan ⁇ at the peak value is 119 ° C. or more is provided.
  • the degree of crystallinity measured by the density method measured for the central portion of the trunk is in the range of 29 to 38%; 2. For high temperature filling, Is preferred.
  • a method for producing a polyester stretch blow molded container wherein a polyester preform heated to a stretching temperature is stretched by stretching by a stretch rod and stretching by air blow,
  • the stretch temperature is in the range of 100 to 130 ° C.
  • the air blow uses blow air adjusted to a temperature in the range of 80 to 200 ° C.
  • the mold temperature in the heat setting is in the range of 130 to 160 ° C.
  • the air blow is composed of pre-blow performed simultaneously with stretching by the stretch rod and main blow performed simultaneously with completion of stretching by the stretch rod, and adjusted to a temperature in the range of 80 to 200 ° C. in both the pre-blow and the main blow.
  • Suitably blown air is used.
  • the stretch blow container made of polyester of the present invention has excellent heat resistance despite the fact that the trunk average thickness is reduced to 280 ⁇ m or less, and the content is 80 ° C. or higher, particularly 83 to 87 ° C. Even when a thermal history of filling and then lowering the temperature is received, thermal deformation of the container is effectively prevented.
  • the stretch blow container made of polyester of the present invention has excellent heat resistance despite the fact that the trunk average thickness is reduced to 280 ⁇ m or less, and the content is 80 ° C. or higher, particularly 83 to 87 ° C. Even when a thermal history of filling and then lowering the temperature is received, thermal deformation of the container is effectively prevented.
  • the tan ⁇ peak value is 0.23 to 0.29, and the tan ⁇ peak temperature at the peak value is in the range of 111 to 118 ° C.
  • the polyester stretch blow container of the aspect is set so as to positively generate a certain degree of thermal deformation (thermal expansion) when the contents are filled at a high temperature. For this reason, the container contracts due to subsequent decompression by cooling. When (absorption under reduced pressure) is performed, the thermal expansion at high temperature and the absorption under reduced pressure at the time of cooling have an appropriate balance, so that the final deformation of the container can be effectively avoided.
  • the polyester blow container (empty container) of the first aspect of the present invention is held in an 85 ° C. oven for 5 minutes, and this is brought to room temperature (23 ° C.).
  • the rate of change of the container based on the volume of the container before heating in the oven is 0.4 to 0.8%, which is larger than 0.3% or less of the conventional container, and is filled at high temperature. Thermal expansion is easy to occur.
  • the container is cooled, and the amount of contraction due to reduced pressure (the amount of absorption under reduced pressure) is the same as that of the conventional container.
  • the amount of shrinkage is small, the balance between thermal expansion and reduced pressure absorption is good, and deformation of the container after filling is effectively prevented.
  • the tan ⁇ peak value is less than 0.25 in the dynamic viscoelasticity measurement measured in the axial direction of the central portion of the trunk portion.
  • the crystal part indicates that the molecular chain stress is relaxed.
  • the peak temperature of tan ⁇ at the peak value is 119 ° C. or higher, which indicates that the ratio of the above-described amorphous portion is small and the degree of crystallization (orientation by stretching) is high. From these, it can be seen that the stretch-molded polyester container of the second aspect of the present invention has excellent heat resistance even in a thinned state.
  • the container is heated from the inner surface side to relieve strain on the inner surface side of the container, and promote self-heating of the container. It becomes possible to improve the heat resistance by promoting oriented crystallization. As a result, a polyester stretch blow container having the above-described characteristics can be formed.
  • a polyester stretch blow molded container formed under the same stretching conditions as in the examples except that blow air that is not heated is used has a tan ⁇ peak temperature of 118 ° C. or lower and a tan ⁇ peak value of 0.25 or higher, Inferior in properties (Comparative Examples 1 to 3).
  • polyester stretch blow molded containers formed by using blow air in the range of 80 to 200 ° C. from the time of pre-blow have the tan ⁇ peak temperature and the tan ⁇ peak value in the above-mentioned ranges, and have excellent heat resistance. (Examples 1 to 6).
  • FIG. 1 shows the schematic side view of the stretch blow container made from polyester of this invention. It is a figure which shows the relationship between the blow air temperature with respect to time in the biaxial stretch blow molding process in the manufacturing method of the polyester stretch blow container of the 2nd aspect of this invention, and a blow pressure. It is a figure which shows the result of the dynamic viscoelasticity measurement about the various bottles measured in Experimental example 1. FIG. It is a figure which shows the result of the dynamic viscoelasticity measurement about the various bottles measured in Experimental example 2.
  • FIG. 1 shows the schematic side view of the stretch blow container made from polyester of this invention. It is a figure which shows the relationship between the blow air temperature with respect to time in the biaxial stretch blow molding process in the manufacturing method of the polyester stretch blow container of the 2nd aspect of this invention, and a blow pressure. It is a figure which shows the result of the dynamic viscoelasticity measurement about the various bottles measured in Experimental example 1.
  • FIG. 2 shows the result of the dynamic viscoelasticity measurement about the various bottles measured in Experimental example 2.
  • the polyester stretch blow molded container of the present invention is generally indicated by 10, has a neck portion 1 and a trunk portion 3 connected to the neck portion 1. Is closed by a bottom 5.
  • the polyester blow container 10 having such a configuration is manufactured by molding a test tube-shaped preform by injection molding or the like, blow-molding the preform, and then heat-setting (heat-setting) it in an appropriate temperature range. However, a detailed manufacturing method will be described later.
  • the neck portion 1 is an unstretched portion (portion fixed by a mold during blow molding), and a thread 1a is appropriately formed on the outer surface according to the form of the cap attached to the container.
  • a support ring 1b is provided below 1a for supporting and conveying the preform and the container to be molded.
  • the body portion 3 (and the bottom portion 5) is a portion that is blow-drawn, and is a portion that is stretch-formed by blowing blow fluid in a state where the neck portion 1 of the preform is fixed.
  • the bottom portion 5 has a raised bottom shape, and a recess is formed on the bottom surface.
  • the polyester stretch blow container 10 of the present invention having the above-described form is thinned, and the average thickness of the body portion 3 which is a stretch-formed part is 280 ⁇ m or less, preferably 270 to 200 ⁇ m, more preferably. Is in the range of 250 to 200 ⁇ m, and weight reduction is realized by such thinning.
  • the tan ⁇ peak value is in the range of 0.23 to 0.29 and the tan ⁇ peak temperature at the peak value is in the range of 111 to 118 ° C., or the polyester stretch blow of the second aspect.
  • the tan ⁇ peak value is less than 0.25, particularly 0.18 to less than 0.25, particularly 0.22 to less than 0.25, and the peak temperature of tan ⁇ at the peak value is 119 ° C. or more, In particular, it is important to be in the range of 119 to 125 ° C.
  • Dynamic viscoelasticity measurement measures the mechanical properties of a sample by measuring stress or strain
  • tan ⁇ is a parameter called loss tangent, expressed as a ratio of loss elastic modulus / storage elastic modulus.
  • the loss elastic modulus is a loss due to an amorphous part
  • the storage elastic modulus is an elastic modulus due to a crystal part, both of which depend on temperature.
  • the temperature at which tan ⁇ exhibits a peak indicates an apparent glass transition point. Therefore, the smaller the tan ⁇ peak value, the more crystal parts are present, and the higher the peak temperature indicating this peak value, the higher the glass transition point, which causes deformation of the container at the time of high temperature filling of the contents. It shows that heat resistance is high.
  • the conventionally well-known thick heat-resistant polyester blow container (conventional heat-resistant container) is thick, it does not expand at the time of filling more than the blow container of this invention.
  • the amount of vacuum absorption by cooling after filling is the same, the amount of shrinkage from the container before filling is smaller in the blow container of the present invention than in the conventional heat-resistant container. Therefore, the conventional heat-resistant container can withstand deformation under reduced pressure and suppress deformation of the container after high-temperature filling, and the first polyester stretch blow container of the present invention is different from conventional heat-resistant containers in that it has thermal expansion. By properly balancing the vacuum absorption, it is a container that effectively suppresses deformation of the bottle after high temperature filling.
  • the peak value or peak temperature of tan ⁇ when the peak value or peak temperature of tan ⁇ is outside the above-mentioned range, the balance between the thermal expansion at the time of high temperature filling of the contents and the contraction due to the subsequent temperature drop is lost. As a result, the deformation that occurs during high temperature filling cannot be effectively prevented.
  • tan ⁇ peak value and peak temperature described above are prepared by cutting the container body into an appropriate size so as to include the central portion X in the body axial direction, and using a viscoelastic spectrometer. It is measured by applying a load from the axial direction of the container.
  • the stretch blow container made of polyester of the first aspect of the present invention a certain amount of thermal deformation occurs during high-temperature filling of the contents, so as to ensure form stability when such thermal deformation occurs.
  • the bottom portion 5 is raised to have a bottom shape and a recess is formed on the bottom surface.
  • the stretch blow container of the present invention described above is formed of a polyester capable of forming a preform by injection molding or compression molding.
  • a polyester polyethylene terephthalate usually formed from terephthalic acid and ethylene glycol is used. (PET) is preferably used.
  • PET polyethylene terephthalate usually has a glass transition point (Tg) of 50 to 90 ° C., particularly 55 to 80 ° C., and a melting point (Tm) of 200 to 275 ° C., particularly 220 to 270 ° C.
  • an ester derived from a dibasic acid other than terephthalic acid or a diol unit other than ethylene glycol provided that the ethylene terephthalate unit occupies 70 mol% or more, particularly 80 mol% or more in the ester repeating unit.
  • Copolyesters containing units can also be suitably used.
  • dibasic acids other than terephthalic acid include aromatic dicarboxylic acids such as isophthalic acid, phthalic acid, and naphthalenedicarboxylic acid; alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid; succinic acid, adipic acid, sebacic acid, and dodecane.
  • diol component other than ethylene glycol examples include propylene glycol, 1,4-butanediol, diethylene glycol, and 1,6-hexylene glycol. , Cyclohexanedimethanol, and one or more of bisphenol A ethylene oxide adducts.
  • Such a polyester should have at least a molecular weight sufficient to form a film, and usually has an intrinsic viscosity (IV) of 0.6 to 1.4 dL / g, particularly 0.63 to 1. An injection grade in the range of 3 dL / g is used.
  • the above-mentioned polyester may be blended with known compounding agents (antioxidants, lubricants, etc.) per se.
  • a polyester may be used as an inner and outer layer, and an oxygen barrier layer and an oxygen absorption layer may be provided as an intermediate layer through an adhesive layer.
  • the oxygen barrier layer having the multilayer structure is formed of an oxygen barrier resin such as an ethylene-vinyl alcohol copolymer or polyamide, so long as the oxygen barrier property is not impaired.
  • the thermoplastic resin may be blended with other thermoplastic resins.
  • the oxygen absorbing layer is a layer containing an oxidizing polymer and a transition metal catalyst, as described in Japanese Patent Application Laid-Open No. 2002-240813, etc., and the oxidizing polymer is activated by the action of the transition metal catalyst. Is oxidized by oxygen, which absorbs oxygen and blocks the permeation of oxygen.
  • Such an oxidizable polymer and a transition metal catalyst are described in detail in the above Japanese Patent Application Laid-Open No. 2002-240813 and the like.
  • Is an olefin resin having a tertiary carbon atom for example, polypropylene or polybutene-1, or a copolymer thereof
  • a thermoplastic polyester or an aliphatic polyamide for example, polypropylene or polybutene-1, or a copolymer thereof
  • a xylylene group-containing polyamide resin for example, polypropylene or polybutene-1, or a copolymer thereof
  • a polymer eg, a polymer derived from a polyene such as butadiene
  • the inorganic salt, organic acid salt, or complex salt of transition metals, such as iron, cobalt, and nickel are typical.
  • each layer is known per se, for example, olefin graft-modified with carboxylic acids such as maleic acid, itaconic acid, fumaric acid or anhydrides thereof, amides, esters, etc. Resins; ethylene-acrylic acid copolymers; ion-crosslinked olefin copolymers; ethylene-vinyl acetate copolymers; and the like are used as adhesive resins.
  • the thickness of each layer described above may be set to an appropriate thickness as long as the average thickness of the body portion of the container wall after blow molding is in the above-described range (280 ⁇ m or less). Furthermore, it is also possible to provide a regrind layer in which scrap generated when molding a blow container is blended with a polyester virgin resin.
  • the polyester stretch blow container of the present invention uses a preform molded by injection molding or the like, and is subjected to stretch blow molding and heat setting, so that the above-mentioned average thickness of the body portion is 280 ⁇ m or less.
  • the peak value of tan ⁇ tend to be small and the peak temperature tends to be high.
  • laboratory experiments are performed in advance so that the dynamic viscoelastic properties (the peak value and the peak temperature of tan ⁇ ) are within a predetermined range.
  • Various conditions may be set according to the thickness of the stretch-formed part (corresponding to the body part of the container) of the molded preform.
  • the preform used for molding the stretch blow container made of polyester according to the present invention can be formed into a single layer or a multilayer structure by molding the above-mentioned polyester by a conventionally known method such as injection molding or compression molding. From the viewpoint of heat resistance, it is desirable that the neck portion of this be heated and crystallized.
  • Preform heating process The molded preform is heated to a stretching temperature before being subjected to stretch blow molding.
  • the outer surface temperature of the preform is in the range of 100 to 140 ° C. In particular, it is desirable to heat so that the temperature is in the range of 120 to 135 ° C and 100 to 130 ° C.
  • the outer surface temperature of the preform is in the range of 100 to 130 ° C. It is desirable to heat as is.
  • the preform may be whitened by thermal crystallization.
  • the preform can be heated by a conventionally known method.
  • the preform is heated at a normal temperature in combination with an infrared heater and an inner surface heater, and cooling due to the conveyance of the preform is taken into consideration. And it heats so that it may become the said temperature range at the time of blow molding.
  • the first blow container of the present invention such a two-stage blow is not suitable, and a normal one-stage blow is applied. This is because, when the container is formed by two-stage blowing, orientation crystallization by blow stretching is promoted, so that it becomes difficult to adjust the peak value and peak temperature of tan ⁇ within the above-described range.
  • the blow air is not particularly limited.
  • the second polyester stretch blow container is molded, it is 80 to 200 ° C., particularly 145. It is preferable to use blow air adjusted to a temperature of ⁇ 200 ° C. As long as blow air in this temperature range is used, it is possible to perform blow molding to the final molded product at the same flow rate without changing the flow rate of blow air even after stretching by the stretch rod. It is desirable to perform pre-blow with a small flow rate until the end of stretching with the rod, and to perform main blow with a greater flow rate than the pre-blow when stretching with the stretch rod is completed.
  • FIG. 2 is a diagram showing the relationship between the temperature and pressure of blow air over time in an example of a biaxial stretch blow molding process for molding the polyester stretch blow container of the second aspect of the present invention.
  • the blow process shown in FIG. 2 is a pre-blow process (0.02 to 0.6 seconds) in which the flow rate of blow air is small and the blow pressure is in the range of 0.5 to 2 MPa. It consists of a main blow step (0.6 to 3 seconds) in the range of 4 MPa, and a cooling step for cooling the container by injecting cooling air after the completion of the main blow.
  • blow air adjusted to a temperature of 80 to 200 ° C.
  • the stretch ratio in the biaxial stretch blow molding step is a range of 1.8 to 3.4 times in the longitudinal stretch ratio, 2.8 to 3.8 times in the circumferential direction, and 4 to 12 times in the area ratio. It is preferable that it exists in. Thereby, the average thickness of the body portion is reduced to 280 ⁇ m or less, and it becomes possible to obtain a final molded product that is reduced in weight.
  • the container after blow molding is subjected to heat fixation and then cooled to complete the final molded product.
  • the heat setting is a one-mold method that is performed simultaneously with blow molding using a mold used for blow molding, or a two-mold method in which a blow-molded container is taken out of the blow mold and reheated with a dedicated mold for heat setting.
  • the one mold method of forming in a short time is suitable.
  • the heating time becomes long, and it becomes difficult to set the heating temperature for molding the container of the present invention.
  • the heating temperature is set so as to satisfy a predetermined dynamic viscoelastic property (tan ⁇ ) according to the stretching temperature (preform temperature) and the stretching ratio described above.
  • the heat setting temperature is 130 ° C. or more and less than 150 ° C.
  • the heat setting time may be several seconds.
  • the heat setting temperature used when manufacturing a normal thick heat-resistant blow container is 150 ° C. or higher, which is higher than the heat setting temperature employed in the present invention.
  • the temperature when obtaining the polyester stretch blow container of the second aspect of the present invention, the temperature may be higher than that of the stretch blow container of the first aspect.
  • the heat setting temperature is 130 to 160 ° C.
  • the heat setting time may be several seconds.
  • the polyester stretch blow container of the present invention thus formed has a crystallinity of 29 to 38% by the density method at the body center portion X as described above, and particularly in the first embodiment. Excellent heat resistance is obtained when the crystallinity is in the range of 30 to 35%, and in the second embodiment, the crystallinity is in the range of 35 to 38%.
  • the stretch blow container made of polyester of the present invention is very thin, for example, a bottle having a full volume of 500 mL and a weight of 22 g or less, a bottle having a full volume of 2 L and a weight of 49 g or less, Considering that the weight of a commercially available 500 mL PET bottle is 28 g or more and the weight of a normal commercially available 2 L PET bottle is 65 g or more, in the present invention, a considerable weight reduction is realized by thinning.
  • Tan ⁇ in dynamic viscoelasticity measurement Referring to FIG. 1, a 5 mm ⁇ 40 mm test piece Y is cut out from the center X of the bottle body so that the long side direction is the bottle height direction, and a viscoelastic spectrometer (EXSTAR6000DMS: Seiko Instruments Inc.) Measurement was performed using The measurement conditions are shown below. From the obtained tan ⁇ curve (temperature plotted on the horizontal axis and tan ⁇ value on the vertical axis), the maximum value of tan ⁇ (tan ⁇ value) and the maximum temperature of tan ⁇ (peak temperature) were derived.
  • EXSTAR6000DMS Seiko Instruments Inc.
  • Measurement mode Tensile sine wave mode Distance between test specimens: 20 mm Frequency: 1Hz Minimum tension: 100mN Temperature rise profile: Temperature rise from 25 ° C. to 210 ° C. at 2 ° C./min (2) Measurement of rate of change The bottle is held in an 85 ° C. oven for 5 minutes and cooled to room temperature (23 ° C.). The volume of the container before heating and after cooling was measured, and the rate of change of the container with respect to the volume before heating was determined. (3) Average thickness measurement The thickness was measured every 20 mm in the longitudinal direction at 6 points in the circumferential direction of the bottle, and the average was obtained. (3) Measurement of heat resistance An empty bottle was filled with water heated to 87 ° C., showered at 77 ° C. for 5 minutes, and then naturally cooled. Thereafter, the deformation of the bottle was visually observed. Small deformation amount: ⁇ Medium deformation amount: ⁇ Large deformation amount: ⁇ Deformation amount cannot be commercialized Level: ⁇
  • Example 1 The following bottles molded under the conditions shown in Table 1 were measured for dynamic viscoelasticity. The results are shown in FIG. In addition, the crystallinity of the bottle of the present invention is also shown in FIG.
  • ⁇ , ⁇ , ⁇ , and ⁇ indicate the next bottles in Table 1 above.
  • ⁇ Invention bottle (bottle for high temperature filling)
  • ⁇ Thick heat-resistant bottle (conventional high-temperature filling bottle)
  • ⁇ Two-stage blow bottle (high-temperature filling bottle blow-molded twice)
  • ⁇ heat-resistant pressure bottle (bottle for carbonated beverages to be heat sterilized after filling, not compatible with high temperature filling)
  • the change rate was measured for the 500 ml bottle of the present invention and the thick heat-resistant bottle.
  • the results are shown in Table 2.
  • the bottle does not deform due to heat, so that a heat-resistant bottle with a thin wall and dynamic viscoelasticity outside the scope of the present invention could not be molded. .
  • the bottle of the first aspect of the present invention has a tan ⁇ peak value of 0.23 to 0.29 and a tan ⁇ peak temperature in the range of 111 to 118 ° C. from dynamic viscoelasticity measurement. Yes, it was confirmed that the bottle is more susceptible to heat shrinkage than the conventional thick heat-resistant bottle. As a result, since the rate of change of the bottle of the present invention is larger than that of the conventional thick heat-resistant bottle, the thermal expansion of the bottle after high-temperature filling at 80 ° C.
  • the bottle of the present invention can effectively prevent deformation of the bottle even if it is subjected to a heat history such as high temperature filling and subsequent temperature drop, although the bottle is thinned by weight reduction.
  • Example 2 The dynamic viscoelasticity, trunk average thickness, and heat resistance of each bottle (Example, Comparative Example) molded under the bottle size and molding conditions shown in Table 3 were measured. The results are shown in Table 3 and FIG.
  • the heat resistance is good when the tan ⁇ peak value is in the range of less than 0.25 and the tan ⁇ peak temperature is 119 ° C. or higher, and the heat resistance decreases when the value is away from the value. It was.
  • the average wall thickness of the bottle is 250 ⁇ m or less, it is more important that the temperature of the blow air is 145 ° C. or more.
  • Comparative Example 4 it can be confirmed that a bottle having an average wall thickness greater than 280 ⁇ m does not cause a decrease in heat resistance unlike a thinned bottle.
  • polyester stretch blow container of the present invention effectively suppresses deformation when the contents are filled at high temperature, a non-carbonated beverage that is filled at a high temperature of 80 ° C. or more, particularly 83 to 87 ° C., for example, It is suitably applied as a container for various fruit juices, water, or various chemical solutions. Further, since it is thinned to 280 ⁇ m or less and lightened, it is possible to save resources and reduce waste, and it can be suitably applied to general-purpose products that are mass-produced.

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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)

Abstract

La présente invention concerne un récipient moulé par étirage-soufflage en polyester, qui est à paroi mince avec une épaisseur moyenne de section de corps de 280 µm ou moins et pour lequel une déformation qui se produit pendant le remplissage à haute température de contenu est efficacement limitée, et est caractérisée en ce que la valeur de crête tanδ et la température de crête tanδ à ladite valeur de crête de mesures de viscoélasticité dynamique mesurées dans la direction axiale de la partie centrale de la section de corps satisfont l'une ou l'autre à (i) la valeur de crête tanδ est dans la plage de 0,23 et 0,29 et la température de crête tanδ à ladite valeur de crête est dans la plage de 111 à 118 °C, ou (ii) la valeur de crête tanδ est inférieure à 0,25 et la température de crête tanδ à ladite valeur de crête est dans la plage de 119 °C ou plus.
PCT/JP2017/023551 2016-06-28 2017-06-27 Récipient moulé par étirage-soufflage en polyester et son procédé de fabrication WO2018003790A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US16/313,779 US11040476B2 (en) 2016-06-28 2017-06-27 Stretch-blow formed polyester container and method of producing the same
CN201780040407.9A CN109415134B (zh) 2016-06-28 2017-06-27 聚酯制拉伸吹塑成形容器及其生产方法
EP17820144.8A EP3476756B1 (fr) 2016-06-28 2017-06-27 Récipient moulé par étirage-soufflage en polyester et son procédé de fabrication

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2016-127784 2016-06-28
JP2016127784 2016-06-28
JP2016-137377 2016-07-12
JP2016137377A JP6862698B2 (ja) 2016-06-28 2016-07-12 ポリエステル製ブロー容器
JP2016225662A JP2018083630A (ja) 2016-11-21 2016-11-21 ポリエステル製延伸ブロー成形容器及びその製造方法
JP2016-225662 2016-11-21

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WO2018003790A1 true WO2018003790A1 (fr) 2018-01-04

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006137058A (ja) * 2004-11-11 2006-06-01 Toyo Seikan Kaisha Ltd プラスチックボトル容器の製造方法
WO2008044793A1 (fr) * 2006-10-12 2008-04-17 Toyo Seikan Kaisha, Ltd. Bouteille en polyester à paroi mince à étirage bi-axial
WO2008123401A1 (fr) * 2007-03-28 2008-10-16 Toyo Seikan Kaisha, Ltd. Contenant moulé par soufflage étiré biaxialement et son procédé de fabrication
JP2011195188A (ja) * 2010-03-23 2011-10-06 Toyo Seikan Kaisha Ltd 耐熱性ポリエステル延伸成形容器
JP2012012487A (ja) * 2010-06-30 2012-01-19 Adeka Corp プラスチックボトルの製造方法
JP2014008636A (ja) * 2012-06-28 2014-01-20 Yoshino Kogyosho Co Ltd 容器内部の陽圧化方法及び充填容器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006137058A (ja) * 2004-11-11 2006-06-01 Toyo Seikan Kaisha Ltd プラスチックボトル容器の製造方法
WO2008044793A1 (fr) * 2006-10-12 2008-04-17 Toyo Seikan Kaisha, Ltd. Bouteille en polyester à paroi mince à étirage bi-axial
WO2008123401A1 (fr) * 2007-03-28 2008-10-16 Toyo Seikan Kaisha, Ltd. Contenant moulé par soufflage étiré biaxialement et son procédé de fabrication
JP2011195188A (ja) * 2010-03-23 2011-10-06 Toyo Seikan Kaisha Ltd 耐熱性ポリエステル延伸成形容器
JP2012012487A (ja) * 2010-06-30 2012-01-19 Adeka Corp プラスチックボトルの製造方法
JP2014008636A (ja) * 2012-06-28 2014-01-20 Yoshino Kogyosho Co Ltd 容器内部の陽圧化方法及び充填容器

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