JP4491815B2 - Method for thermal crystallization of preform mouthpiece - Google Patents
Method for thermal crystallization of preform mouthpiece Download PDFInfo
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- JP4491815B2 JP4491815B2 JP2004107254A JP2004107254A JP4491815B2 JP 4491815 B2 JP4491815 B2 JP 4491815B2 JP 2004107254 A JP2004107254 A JP 2004107254A JP 2004107254 A JP2004107254 A JP 2004107254A JP 4491815 B2 JP4491815 B2 JP 4491815B2
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- 238000002425 crystallisation Methods 0.000 title claims description 39
- 230000008025 crystallization Effects 0.000 title claims description 33
- 238000000034 method Methods 0.000 title description 19
- 229920005989 resin Polymers 0.000 claims description 25
- 239000011347 resin Substances 0.000 claims description 25
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 23
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 23
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 235000013305 food Nutrition 0.000 claims description 5
- -1 polyethylene terephthalate Polymers 0.000 claims description 4
- 238000000071 blow moulding Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 description 10
- 238000012545 processing Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 230000001954 sterilising effect Effects 0.000 description 5
- 238000004659 sterilization and disinfection Methods 0.000 description 5
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 235000013361 beverage Nutrition 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 235000015203 fruit juice Nutrition 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 241001122767 Theaceae Species 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- MMINFSMURORWKH-UHFFFAOYSA-N 3,6-dioxabicyclo[6.2.2]dodeca-1(10),8,11-triene-2,7-dione Chemical group O=C1OCCOC(=O)C2=CC=C1C=C2 MMINFSMURORWKH-UHFFFAOYSA-N 0.000 description 1
- 229920001634 Copolyester Polymers 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- ORLQHILJRHBSAY-UHFFFAOYSA-N [1-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1(CO)CCCCC1 ORLQHILJRHBSAY-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- RXOHFPCZGPKIRD-UHFFFAOYSA-N naphthalene-2,6-dicarboxylic acid Chemical compound C1=C(C(O)=O)C=CC2=CC(C(=O)O)=CC=C21 RXOHFPCZGPKIRD-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- Containers Having Bodies Formed In One Piece (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
本発明は、口筒部を熱結晶化処理したポリエチレンテレフタレート（以下ＰＥＴと記す）系樹脂製の２次延伸ブロー成形壜体用プリフォーム口筒部の熱結晶化方法に関するものである。 The present invention relates to a method for thermal crystallization of a preform mouthpiece portion for a secondary stretch blow-molded casing made of polyethylene terephthalate (hereinafter referred to as PET) resin, in which the mouthpiece portion is thermally crystallized.
特許文献１には、高温での充填、あるいは殺菌等の熱処理工程を要する製品、たとえばお茶、果汁飲料用等に使用されるＰＥＴ樹脂製２軸延伸ブロー成形壜体についての記載がある。このようにお茶、果汁飲料等のように高温（８０〜９０℃程度）での充填あるいは熱処理工程のある製品向けのＰＥＴ樹脂製壜体では熱結晶化処理により耐熱変形性が改良された所謂耐熱口筒部が使用される。 Patent Document 1 describes a PET resin biaxially stretched blow molded casing used for products requiring heat treatment such as filling at high temperature or sterilization, such as tea and fruit juice beverages. Thus, in a PET resin casing for products with a high temperature (about 80 to 90 ° C.) or heat treatment process such as tea and fruit juice beverages, the so-called heat resistance is improved by heat crystallization treatment. A mouth tube is used.
そして、特許文献２には口筒部に収縮を規制するためのコアを挿入し、熱結晶化処理をして、口筒部の寸法精度を高くするための方法についての記載がある。
近年においては上記ＰＥＴ樹脂製壜体は、１３０℃程度での高温殺菌処理を要するレトルト食品向けへも使用が検討されるようになってきており、１３０℃程度にも至る高温での口筒部の変形を抑制するためには、口筒部の熱結晶化処理を口筒部の表面温度で１８０℃程度の高温で実施する必要があるが、このような高温での処理では結晶化による収縮量が大きくなると共に、口筒部が楕円状になる等のいびつな変形も顕著になり、外観上の問題、キャップによる密封性が不良になる等の問題が発生する。 In recent years, the use of the PET resin casing for retort foods requiring high-temperature sterilization at about 130 ° C. has been studied, and the mouthpiece at a temperature as high as about 130 ° C. In order to suppress the deformation, it is necessary to carry out the thermal crystallization process of the mouthpiece part at a high temperature of about 180 ° C. at the surface temperature of the mouthpiece part. As the amount increases, irregular deformation such as an elliptical shape of the mouth tube portion becomes prominent, and problems such as appearance problems and poor sealing performance due to the cap occur.
ここで、楕円状になる等のいびつな変形を抑制するためには上記のコアを挿入して変形の態様を規制しながら熱処理する方法が有効ではあるが、レトルト処理用途向けにプリフォームの口筒部をコアを挿入した状態で１８０℃程度の高温で処理して、２軸延伸ブロー成形で壜体を製造、食品を充填、キャッピング後レトルト処理するような場合には口筒部の口径がかなり縮径変形し、シール機能が損なわれる等の問題が解決しない。 Here, in order to suppress the distorted deformation such as an elliptical shape, a method of performing heat treatment while inserting the above-mentioned core and restricting the deformation mode is effective. In the case where the cylinder part is processed at a high temperature of about 180 ° C. with the core inserted, and the casing is manufactured by biaxial stretch blow molding, the food is filled, and the retort process is performed after capping, the diameter of the cylinder part is Problems such as considerable diameter reduction and loss of sealing function cannot be solved.
そこで、本発明は、上記した従来技術における問題点を解消すべく創案されたもので、レトルト処理程度の高温処理における変形を抑制するための口筒部の熱結晶化処理方法の創出を技術的課題とし、もってレトルト処理程度の高温にも対応可能な高い耐熱性を有する口筒部を有するＰＥＴ系樹脂製壜体を提供することを目的とする。 Therefore, the present invention was devised in order to solve the above-described problems in the prior art, and technically the creation of a thermal crystallization treatment method for the mouth tube portion for suppressing deformation in high-temperature treatment such as retort treatment. It is an object of the present invention to provide a PET resin casing having a mouth tube portion having high heat resistance that can cope with a high temperature as high as a retort treatment.
上記技術的課題を解決する第１の発明の手段は、
レトルト処理を必要とする食品向け用途に使用されるＰＥＴ系樹脂製２軸延伸ブロー成形壜体用のプリフォームの口筒部を、所定温度で所定時間の熱結晶化処理し、
この熱結晶化処理の直後に、内周面に対して０．０２〜０．２ｍｍの間隙を形成する外径を有した円柱状コアを挿入することを特徴とするプリフォーム口筒部の熱結晶化方法である。
The means of the first invention for solving the above technical problem is:
The mouthpiece part of the preform for the biaxially stretched blow molded casing made of PET resin used for food applications requiring retort treatment is subjected to thermal crystallization treatment at a predetermined temperature for a predetermined time ,
Immediately after the thermal crystallization treatment, a cylindrical core having an outer diameter that forms a gap of 0.02 to 0.2 mm with respect to the inner peripheral surface is inserted, and the heat of the preform mouthpiece portion is characterized. It is a crystallization method.
本願発明者らはレトルト処理向け用途に係るＰＥＴ樹脂製壜体の改良検討をする中で、口筒部の表面温度が１８０℃程度の高温で口筒部を熱結晶化処理すると、結晶化による収縮量が大きいために、その結果冷却後においてコアによる規制により、いびつな変形は抑制されるものの、収縮変形が抑制され大きな歪みが内部に残留し、この残留歪みがレトルト処理時の高温状態で開放されて、大きな収縮が発生すること、そして、一方コアを挿入しないで自然に収縮させた場合には、口筒部がいびつな変形状態となるものの、残留歪みが小さく、レトルト処理による後収縮を抑制できることを見出し、上記発明に至った。 While the inventors of the present application are studying the improvement of a PET resin casing for use in retort processing, if the mouth tube portion is thermally crystallized at a high temperature of about 180 ° C., the crystallization is caused by crystallization. Since the amount of shrinkage is large, distorted deformation is suppressed by the regulation by the core after cooling as a result, but shrinkage deformation is suppressed and large strain remains inside, and this residual strain is in a high temperature state during retort processing. When opened, large shrinkage occurs. On the other hand, when it is naturally shrunk without inserting the core, the mouth tube part is deformed in an irregular shape, but the residual strain is small and the post-shrinkage by retort processing. Has been found to be able to be suppressed, and the present invention has been achieved.
上記第１の発明の方法により、所定温度で所定時間の熱結晶化処理においては、口筒部を自然収縮させることができ、残留歪みの発生を抑制することができると共に、この口筒部では熱結晶化処理直後においても冷却による後収縮により縮径が進行し、口筒部がコア外周面に外接するようになり、冷却後の形状は挿入したコアで規制されるので、いびつな形状のない、そして残留歪の小さい状態で熱結晶化された口筒部とすることができる。
この結果レトルト処理等の高温での厳しい条件下での殺菌処理等においても口筒部の変形を極く小さく抑制することが可能となる。 According to the method of the first invention, in the thermal crystallization process at a predetermined temperature for a predetermined time, the mouth tube portion can be naturally contracted, and the occurrence of residual strain can be suppressed. Immediately after the thermal crystallization treatment, the diameter shrinks due to post-shrinkage due to cooling, and the mouth tube part comes to circumscribe the outer peripheral surface of the core, and the shape after cooling is regulated by the inserted core. It is possible to obtain a mouth tube portion that is thermally crystallized with little residual strain.
As a result, deformation of the mouth tube portion can be suppressed to a very small level even in sterilization processing under severe conditions at high temperatures such as retort processing.
従来、ＰＥＴ系樹脂製壜体はレトルト向けの用途の使用は、特に口筒部の変形の問題で困難であったが、上記第１の発明の方法によりレトルト処理条件においても変形の小さい実用上問題のない口筒部を有する壜体を提供することができる。 Conventionally, it has been difficult to use a PET-based resin casing for retort due to the problem of deformation of the mouth tube portion. However, the method of the first invention is practically less deformed even under retort processing conditions. It is possible to provide a housing having a mouth tube portion without any problem.
間隙の大きさをどの程度小さくするかは、口筒部の口径が大きいほど、また熱結晶化処理温度が高温であるほど小口径とする等、試験等をしながら適宜に決めることができるが、その範囲は０．０２ｍｍ〜０．２ｍｍの範囲とするのが良い。 How much the size of the gap is to be reduced can be determined as appropriate while conducting a test or the like, such as increasing the diameter of the tube portion and decreasing the diameter as the temperature of the thermal crystallization treatment increases. The range is preferably 0.02 mm to 0.2 mm.
すなわち、この間隙が０．０２ｍｍ未満の場合は、コアの挿入がスムーズに実施できなくなる。 That is, when the gap is less than 0.02 mm, the core cannot be smoothly inserted.
また、０．２ｍｍを超える場合には、熱結晶化処理後の後収縮におけるコアによる変形規制の効果が十分でなくなり熱結晶化処理後のプリフォームの口筒部が楕円状等のいびつな形状となってしまう。 In addition, when the thickness exceeds 0.2 mm, the effect of the deformation restriction by the core in the post-shrinkage after the thermal crystallization treatment is not sufficient, and the mouth portion of the preform after the thermal crystallization treatment is an irregular shape such as an ellipse. End up.
第２の発明の方法は、第１の発明において、挿入したコアの温度を９０〜１３０℃に温調すること、にある。 The method of 2nd invention exists in temperature-controlling the temperature of the inserted core to 90-130 degreeC in 1st invention .
第２の発明の方法により、９０〜１３０℃の温度範囲は、ＰＥＴ系樹脂の軟化点以上の温度で、かつ熱結晶化が進行するためには低温である温度範囲であり、口筒部がコアに外接した状態で口筒部の内周面近傍を、結晶化の進行を抑えた状態でかつ軟化温度以上で比較的変形のしやすい軟化状態としておくことができ、コアによる変形規制効果が十分に発揮されると共に、後収縮による内部歪みの累積を抑制することができ、冷却固化状態における残留歪みをより効果的に抑制することが可能となる。 According to the method of the second invention , the temperature range of 90 to 130 ° C. is a temperature range above the softening point of the PET-based resin and a temperature range that is low for thermal crystallization to proceed. The vicinity of the inner peripheral surface of the mouth tube portion in a state of circumscribing the core can be in a softened state in which the progress of crystallization is suppressed and is relatively easy to deform above the softening temperature. While being fully exhibited, accumulation of internal strain due to post-shrinkage can be suppressed, and residual strain in the cooled and solidified state can be more effectively suppressed.
なお、本発明に使用するポリエチレンテレフタレート系樹脂としては、主としてＰＥＴが使用されるが、ＰＥＴ樹脂の本質が損なわれない限り、エチレンテレフタレート単位を主体として、他のポリエステル単位を含む共重合ポリエステルも使用できると共に、たとえば耐熱性を向上させるためにナイロン系樹脂、ポリエチレンテレナフタレート樹脂等の樹脂をブレンドして使用することもできる。共重合ポリエステル形成用の成分としては、たとえばイソフタル酸、ナフタレン２，６ジカルボン酸、アジピン酸等のジカルボン酸成分、プロピレングリコール、１，４ブタンジオール、テトラメチレングリコール、ネオペンチルグリコール、シクロヘキサンジメタノール、ジエチレングリコール等のグリコール成分を挙げることができる。
As the polyethylene terephthalate resin used in the present invention, PET is mainly used. However, as long as the essence of the PET resin is not impaired, a copolymer polyester mainly containing ethylene terephthalate units and containing other polyester units is also used. In addition, for example, in order to improve heat resistance, a resin such as nylon resin and polyethylene terephthalate resin can be blended and used. Examples of the component for forming the copolyester include dicarboxylic acid components such as isophthalic acid,
さらには、本発明に記載されるＰＥＴ系樹脂製壜体は、ＰＥＴ樹脂製壜体としての本質が損なわれない限り、たとえば耐熱性、ガスバリア性の向上のためにＰＥＴ樹脂／ナイロン樹脂／ＰＥＴ樹脂のようにナイロン樹脂等の中間層を有したものであっても良い。
Further, the PET-based resin casing described in the present invention is not limited to PET resin / nylon resin / PET resin, for example, to improve heat resistance and gas barrier properties, as long as the essence as a PET resin casing is not impaired. It may have an intermediate layer such as nylon resin.
本発明は上記した構成であり、以下に示す効果を奏する。
第１の発明にあっては、口筒部を所定温度で所定時間の前記熱結晶化処理した直後に、内周面に対して０．０２〜０．２ｍｍの間隙を形成する外径を有した円柱状コアを挿入して形成することにより、レトルト処理条件においても変形の小さい実用上問題のない口筒部を有するＰＥＴ系樹脂製壜体を提供することができる。
The present invention has the above-described configuration, and has the following effects.
In the first invention , immediately after the thermal crystallization treatment of the mouth tube portion at a predetermined temperature for a predetermined time, it has an outer diameter that forms a gap of 0.02 to 0.2 mm with respect to the inner peripheral surface. By inserting the formed cylindrical core, it is possible to provide a PET-based resin casing having a mouth tube portion that is small in deformation and has no practical problem even under retort processing conditions .
第２の発明にあっては、挿入したコアの温度を９０〜１３０℃の範囲に温調することにより、よりゆがみのない、高い耐熱性を有した口筒部を有するＰＥＴ系樹脂製壜体を提供することができる。
In the second invention , by adjusting the temperature of the inserted core in the range of 90 to 130 ° C., a PET-based resin casing having a mouth tube portion having higher heat resistance without distortion. Can be provided.
以下本発明の実施の形態を説明する。
図１は本発明のプリフォーム１口筒部２の熱結晶化方法における装置の一例を示す説明図である。射出成形したプリフォーム１をホルダー４に挿入し、ネックリング３を含めた口筒部２を赤外線ヒータ５で加熱して熱結晶化処理を行なう。この際加熱を周方向に亘って均一にするためにホルダー４を回転させながら加熱を実施する。このようにして口筒部２を熱結晶化したプリフォーム１を用いて二軸延伸ブロー成形してＰＥＴ系樹脂製壜体を得る。
Embodiments of the present invention will be described below.
Figure 1 is an explanatory diagram showing an example of a device in the thermal crystallization method of the preform 1-necked
上記、熱結晶化処理の条件は一般に１５０〜２２０℃の温度で、１〜３分間行うが、この条件は壜体１に要求される耐熱性（殺菌処理温度等）等を考慮して選択され、要求される耐熱性が高いほど加熱温度を高くする必要がある。たとえば一般的な果汁飲料等では８０〜９０℃の温度で高温充填されるが、熱処理条件は口筒部の表面温度で１５０℃、２分程度であり、レトルト食品向けの場合には口筒部の表面温度で１８０℃、２分程度の処理が必要となる。 The above-mentioned conditions for the thermal crystallization treatment are generally performed at a temperature of 150 to 220 ° C. for 1 to 3 minutes, and these conditions are selected in consideration of the heat resistance (such as the sterilization treatment temperature) required for the casing 1. The higher the required heat resistance, the higher the heating temperature must be. For example, in general fruit juice beverages and the like, high temperature filling is performed at a temperature of 80 to 90 ° C., but the heat treatment condition is 150 ° C. for about 2 minutes at the surface temperature of the mouth tube portion. At a surface temperature of about 180 ° C. for about 2 minutes.
所定温度で所定時間の熱結晶化処理はコア６を挿入しないで実施するので、赤外線ヒータ５による加熱により熱結晶化が進行すると、結晶化に伴なう体積収縮で口筒部が規制のない自由な状態で収縮する。
Since the thermal crystallization treatment at a predetermined temperature for a predetermined time is performed without inserting the core 6, when thermal crystallization proceeds by heating with the
図２は本発明の熱結晶化方法を示す説明図であり、プリフォーム１の口筒部２にコア６を挿入した状態を示す。（ａ）は所定温度で所定時間の熱結晶化処理直後にコア６を挿入した状態、（ｂ）は挿入後、冷却による後収縮により口筒部２が縮径してコア６に外接した状態を示す説明図である。（ａ）の状態では口筒部２内周面とコア６の外周面の間に間隙ｔが形成するようにしている。ここでコア６の温度は、高温の口筒部２に内接した状態においても、その温度が９０〜１３０℃の範囲になるように冷却して調整しておく。
FIG. 2 is an explanatory view showing the thermal crystallization method of the present invention , and shows a state where the core 6 is inserted into the
図２（ａ）の状態で、間隙ｔをその範囲も含めてどの程度とするかは、口筒部２口径、熱結晶化処理温度等の条件を考慮し決める。具体的には予備的な試験をして、プリフォーム間によるバラツキ、１ケのプリフォームの口筒部内径の場所によるばらつき、熱結晶化処理による熱収縮量のバラツキ等も評価して、コア６の外径を決めることにより、０．０２ｍｍ〜０．２ｍｍの範囲内で適宜決めることができる。
In the state of FIG. 2A, the extent of the gap t including the range is determined in consideration of conditions such as the diameter of the
実施例
射出成形により、ＰＥＴ樹脂製であり口筒部２の呼び径が２８ｍｍのプリフォーム１を成形し、このプリフォーム１を図１の装置で、口筒部の表面温度１８０℃で２分間熱結晶化処理を実施し、この処理の直後、間隙ｔが０．０４〜０．１５ｍｍになるような外径のコア６を、その温度が１００〜１２０℃になるように制御しながら口筒部２に挿入して冷却した。そして上記条件で口筒部２を熱結晶化処理したプリフォーム１を常法により二軸延伸ブロー成形して内容量５００ｍｌの実施例の壜体を得た。なお、本実施例において口筒部２の密度は１．３９８ｇ／ｃｍ３であった。
Example A preform 1 made of PET resin and having a nominal diameter of 28 mm was formed by injection molding, and this preform 1 was formed with the apparatus shown in FIG. 1 at a surface temperature of the mouthpiece of 180 ° C. for 2 minutes. A thermal crystallization process is performed, and immediately after this process, the outer diameter core 6 having a gap t of 0.04 to 0.15 mm is controlled while the temperature is controlled to be 100 to 120 ° C. Inserted into
比較例
実施例と同じプリフォーム１を用い、コア６をプリフォーム１の口筒部２に摺動状態で挿入後、実施例と同条件で熱結晶化処理を実施した。そしてこのプリフォーム１を常法により二軸延伸ブロー成形して内容量５００ｍｌの比較例の壜体を得た。なお、本比較例において口筒部２の密度は１．３８４ｇ／ｃｍ３であった。
Comparative Example Using the same preform 1 as in the example, the core 6 was inserted into the
上記実施例と比較例の壜体に水を充填し、１２４℃、２０分の条件で加圧水によるレトルト処理を実施し、その後室温でのレトルト処理前後における口径（内径と外径）の変化を測定した。 The casings of the above examples and comparative examples are filled with water, subjected to retort treatment with pressurized water under conditions of 124 ° C. for 20 minutes, and then the change in the diameter (inner diameter and outer diameter) before and after the retort treatment at room temperature is measured. did.
実施例において口筒部２の外径変化は−０．１４ｍｍ、内径変化は−０．１８ｍｍであった。また比較例において口筒部２の外径変化は−０．４１ｍｍ、内径変化は−０．４２ｍｍであった。ここで試験本数は各５本で、上記値は平均値でありマイナスは縮径していることを示す。
In the examples, the outer diameter change of the
上記結果からわかるように、レトルト処理により口径はいずれの場合も縮径しているが、実施例の壜体は、比較例の壜体に比較してその程度が略１／２〜１／３程度の大きさに抑制されており、キャップの螺合および螺脱性、シール性等実用的に全く問題のない範囲の変形（縮径）であった。一方比較例の壜体は、レトルト処理後キャップによるシール性に問題があるものとなった。 As can be seen from the above results, the diameter of the caliber is reduced in any case by the retort treatment, but the degree of the case of the example is about 1/2 to 1/3 compared to the case of the comparative example. The deformation (reduction in diameter) was within a range where there was no practical problem such as screwing and unscrewing of the cap and sealability. On the other hand, the casing of the comparative example has a problem in sealing performance by the cap after retort processing.
以上説明したように本発明のプリフォーム口筒部の熱結晶化方法はレトルト殺菌処理程度の高温の処理においても口筒部の変形を小さく抑えることができ、レトルト食品向け用途等に幅広い用途展開が期待される。 As described above, the thermal crystallization method of the preform mouthpiece part of the present invention can suppress the deformation of the mouthpiece part even in high-temperature processing such as retort sterilization treatment, and can be used in a wide range of applications such as for retort foods. There is expected.
１ ；プリフォーム
２ ；口筒部
３ ；ネックリング
４ ；ホルダー
５ ；赤外線ヒータ
６ ；コア
ｔ ；間隙
DESCRIPTION OF SYMBOLS 1;
Claims (2)
該熱結晶化処理の直後に、内周面に対して０．０２〜０．２ｍｍの間隙を形成する外径を有した円柱状コアを挿入することを特徴とするプリフォーム口筒部の熱結晶化方法。 Mouth tube portion of the preform for polyethylene terephthalate-based resin biaxial stretch blow molding the bottle to be used in food for applications requiring retort treatment, was treated predetermined time during thermal crystallization at a given temperature,
Immediately after the thermal crystallization treatment, a cylindrical core having an outer diameter that forms a gap of 0.02 to 0.2 mm with respect to the inner peripheral surface is inserted, and the heat of the preform mouth tube portion is characterized. Crystallization method.
Preform mouth cylindrical portion thermal crystallization method according to claim 1, characterized in that the temperature control the temperature of the inserted core 90 to 130 ° C..
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11254515A (en) * | 1998-03-11 | 1999-09-21 | Toppan Printing Co Ltd | Method for molding plastic bottle |
| JP2001150522A (en) * | 1999-11-26 | 2001-06-05 | Toyo Seikan Kaisha Ltd | Polyester container and method of manufacturing the same |
| JP2003341644A (en) * | 2002-05-20 | 2003-12-03 | Dainippon Printing Co Ltd | Method for machining plug inserting tool, and plug crystallizing method using the tool |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11254515A (en) * | 1998-03-11 | 1999-09-21 | Toppan Printing Co Ltd | Method for molding plastic bottle |
| JP2001150522A (en) * | 1999-11-26 | 2001-06-05 | Toyo Seikan Kaisha Ltd | Polyester container and method of manufacturing the same |
| JP2003341644A (en) * | 2002-05-20 | 2003-12-03 | Dainippon Printing Co Ltd | Method for machining plug inserting tool, and plug crystallizing method using the tool |
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