JP7158338B2 - Preform and container molding method - Google Patents

Preform and container molding method Download PDF

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Publication number
JP7158338B2
JP7158338B2 JP2019102506A JP2019102506A JP7158338B2 JP 7158338 B2 JP7158338 B2 JP 7158338B2 JP 2019102506 A JP2019102506 A JP 2019102506A JP 2019102506 A JP2019102506 A JP 2019102506A JP 7158338 B2 JP7158338 B2 JP 7158338B2
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diameter portion
reduced
diameter
preform
thickness
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JP2020196160A (en
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直斗 松竹
剛 吉良
友彦 杉森
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Suntory Holdings Ltd
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Suntory Holdings Ltd
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Priority to JP2019102506A priority Critical patent/JP7158338B2/en
Priority to CN202080039968.9A priority patent/CN113993676B/en
Priority to PCT/JP2020/020364 priority patent/WO2020241509A1/en
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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
    • B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/14—Making preforms characterised by structure or composition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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

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

Description

本発明は、ブロー成形により容器を成形するためのプリフォーム、および、プリフォームをブロー成形して容器を成形する容器成形方法に関する。 The present invention relates to a preform for molding a container by blow molding, and a container molding method for blow molding a preform to mold a container.

飲料を充填する用途などに、プラスチック製の容器が汎用されている。かかる容器は、射出成形により製造されたプリフォームを材料として、二軸延伸ブロー成形などのブロー成形により製造されることが一般的である。このような容器の製造方法に鑑み、プリフォームには良好なブロー成形性が求められる。ブロー成形工程における成形不良は、容器の外観の美観を損なう、容器製造の歩留まりが低下する、などの不具合を引き起こすおそれがある。そのため、プリフォームのブロー成形性を向上する種々の発明が提案されている。 Plastic containers are widely used for applications such as filling beverages. Such a container is generally manufactured by blow molding such as biaxial stretch blow molding using a preform manufactured by injection molding as a material. In view of such container manufacturing methods, preforms are required to have good blow moldability. Molding defects in the blow molding process may cause problems such as impairing the appearance of the container and reducing the yield of container production. Therefore, various inventions have been proposed to improve the blow moldability of preforms.

たとえば特開２０１８－７９５７４号公報（特許文献１）には、口部直下部分の肉厚を胴部の肉厚より小さくしたプリフォームが開示されている。このプリフォームによれば、容器の口部直下の部分に未延伸部が生じる不具合が生じにくい。また、特開２０１７－７２６４号公報（特許文献２）、特開２０１７－３０２１５号公報（特許文献３）などにも、ブロー成形性を向上したプリフォームが開示されている。 For example, Japanese Unexamined Patent Application Publication No. 2018-79574 (Patent Document 1) discloses a preform in which the thickness of the portion immediately below the mouth portion is smaller than the thickness of the trunk portion. According to this preform, it is difficult to cause the problem that an unstretched portion is formed in the portion immediately below the mouth portion of the container. In addition, preforms with improved blow moldability are also disclosed in JP-A-2017-7264 (Patent Document 2), JP-A-2017-30215 (Patent Document 3), and the like.

特開２０１８－７９５７４号公報JP 2018-79574 A 特開２０１７－７２６４号公報JP 2017-7264 A 特開２０１７－３０２１５号公報JP 2017-30215 A

しかし、特許文献１～３のような技術を適用した場合であっても、容器の首部から肩部にかけて厚肉になる不具合が生じる場合があった。たとえば、特許文献１の技術は容器の首部の未延伸を防止する技術であり、特許文献２の技術は容器の胴部の賦形不良を防止する技術であり、特許文献３の技術はブロー成形工程における容器の破裂を防止する技術である。したがって、これらの技術によっては、肩部の偏肉は防止できなかった。 However, even when the techniques disclosed in Patent Documents 1 to 3 are applied, there are cases where the thickness of the container increases from the neck portion to the shoulder portion. For example, the technique of Patent Document 1 is a technique for preventing unstretching of the neck of a container, the technique of Patent Document 2 is a technique of preventing poor shaping of the body of a container, and the technique of Patent Document 3 is blow molding. This is a technology that prevents the container from bursting during the process. Therefore, these techniques cannot prevent uneven thickness of the shoulder portion.

そこで、容器の首部から肩部にかけて厚肉になる不具合を防止しうるプリフォームの実現が望まれる。 Therefore, it is desired to realize a preform that can prevent the problem of thickening from the neck to the shoulder of the container.

本発明に係るプリフォームは、ブロー成形により容器を成形するためのプリフォームであって、口部と、前記口部に連設する円筒状の大径部と、前記大径部に連設し、前記大径部から離間するに従って縮径する円錐台筒状の縮径部と、前記縮径部に連設する有底円筒
状の小径部と、を備え、前記縮径部は、前記大径部に連設する縮径部上部と、前記小径部
に連設する縮径部下部と、前記縮径部上部および前記縮径部下部に連設する縮径部中部と
、を有し、前記縮径部中部の肉厚は、前記大径部の肉厚の８５％以下であり、前記縮径部
上部は、その肉厚が、前記大径部に連設する部分における前記大径部と同一の肉厚から、
前記縮径部中部に連設する部分における前記縮径部中部と同一の肉厚へと、連続的に変化
するように形成され、前記縮径部の軸心方向に沿った前記縮径部上部の長さは３ｍｍ以下
であり、前記縮径部の軸心方向に沿った前記縮径部上部の外径の変化率が、前記縮径部の軸心方向に沿った前記縮径部上部の内径の変化率より大きいことを特徴とする。 A preform according to the present invention is a preform for molding a container by blow molding, comprising a mouth portion, a cylindrical large-diameter portion connected to the mouth portion, and a cylindrical large-diameter portion connected to the large-diameter portion. , a truncated cylindrical diameter-reduced portion whose diameter decreases with increasing distance from the large-diameter portion, and a bottomed cylindrical small-diameter portion connected to the diameter-reduced portion, wherein the diameter-reduced portion a reduced diameter portion upper portion connected to the diameter portion, a reduced diameter portion lower portion connected to the reduced diameter portion, and a reduced diameter portion middle portion connected to the reduced diameter portion upper portion and the reduced diameter portion lower portion; The thickness of the central portion of the reduced diameter portion is 85% or less of the thickness of the large diameter portion, and the thickness of the upper portion of the reduced diameter portion is the same as that of the large diameter portion at the portion connected to the large diameter portion. from the same wall thickness as
The upper portion of the reduced-diameter portion along the axial direction of the reduced-diameter portion is formed so as to continuously change to the same thickness as that of the middle portion of the reduced-diameter portion at the portion connected to the middle portion of the reduced-diameter portion. The length is 3 mm or less, and the rate of change of the outer diameter of the upper portion of the reduced diameter portion along the axial direction of the reduced diameter portion is equal to the upper portion of the reduced diameter portion along the axial direction of the reduced diameter portion is greater than the change rate of the inner diameter of

また、本発明に係る容器成形方法は、前記プリフォームをブロー成形して容器を成形することを特徴とする。 A container molding method according to the present invention is characterized in that the container is molded by blow molding the preform.

これらの構成によれば、容器の首部から肩部にかけて厚肉になる不具合を好適に防止し
うる。したがって、美観に優れた容器を提供しうる。また、これらの構成によれば、工場
のラインで首部を掴んで搬送可能な形状による搬送適性の維持と、上記の偏肉の防止とを
好適に両立しうる。特に、肩部の偏肉を防止しやすい。 According to these configurations, it is possible to suitably prevent the problem that the thickness of the container increases from the neck to the shoulder. Therefore, it is possible to provide a container excellent in appearance. In addition, according to these configurations, it is possible to both maintain the transport aptitude due to the shape that can be transported by gripping the neck portion on the factory line and prevent the uneven thickness described above. In particular, it is easy to prevent uneven thickness of the shoulder portion.

以下、本発明の好適な態様について説明する。ただし、以下に記載する好適な態様例によって、本発明の範囲が限定されるわけではない。 Preferred embodiments of the present invention are described below. However, the scope of the present invention is not limited by the preferred embodiments described below.

本発明に係るプリフォームは、一態様として、前記小径部の肉厚は、前記縮径部中部の肉厚より大きいことが好ましい。 As one aspect of the preform according to the present invention, it is preferable that the thickness of the small-diameter portion is larger than the thickness of the central portion of the reduced-diameter portion.

この構成によれば、肩部の偏肉をさらに効果的に防止しうる。 According to this configuration, it is possible to more effectively prevent uneven thickness of the shoulder portion.

本発明に係るプリフォームは、一態様として、重量が５～１８ｇであることが好ましい。 As one aspect, the preform according to the present invention preferably has a weight of 5 to 18 g.

この構成によれば、市場に一般に流通する容器のうち、内容量が比較的小さい容器の成形において、肩部の偏肉を効果的に防止しうる。なお、かかる偏肉は、内容量が小さい容器の成形において特に生じやすい傾向がある。 According to this configuration, it is possible to effectively prevent uneven thickness of the shoulder portion when molding a container having a relatively small capacity among the containers that are generally distributed in the market. It should be noted that such thickness unevenness tends to occur particularly easily in the molding of containers having a small internal capacity.

本発明に係る容器成形方法は、一態様として、前記容器の内容量が１００～１０００ｍＬであることが好ましい。 As one aspect of the container molding method according to the present invention, it is preferable that the content of the container is 100 to 1000 mL.

この構成によれば、本発明に係る容器成形方法によって、市場に広く流通する内容量の容器について美観に優れた容器を製造しうる。 According to this configuration, by using the container molding method of the present invention, it is possible to manufacture a container with an excellent appearance for a container having a content that is widely distributed in the market.

本発明のさらなる特徴と利点は、図面を参照して記述する以下の例示的かつ非限定的な実施形態の説明によってより明確になるであろう。 Further features and advantages of the invention will become clearer from the following description of exemplary and non-limiting embodiments described with reference to the drawings.

実施形態に係るプリフォームの正面図Front view of a preform according to an embodiment 図１に図示したＡ部分の拡大図Enlarged view of part A shown in FIG. 実施形態に係るペットボトルの正面図Front view of the PET bottle according to the embodiment

本発明に係るプリフォームおよび容器成形方法の実施形態について、図面を参照して説明する。以下では、本発明に係るプリフォームを、飲料用のペットボトル１００（容器の例。以下、ボトル１００と記載する。）を成形するためのプリフォーム１に適用した例について説明する。 An embodiment of a preform and a container molding method according to the present invention will be described with reference to the drawings. An example in which the preform according to the present invention is applied to a preform 1 for molding a PET bottle 100 (an example of a container, hereinafter referred to as bottle 100) for beverages will be described below.

〔プリフォームおよびボトルの概略〕
本実施形態に係るプリフォーム１は、口部１０、大径部２０、縮径部３０、および小径部４０を備え、全体として試験管状の形状を有する（図１）。プリフォーム１の重量は１５ｇである。各部の詳細については後述するが、プリフォーム１からボトル１００を成形すると、プリフォーム１の口部１０、大径部２０、縮径部３０、および小径部４０は、それぞれ、ボトル１００の口部１０１、首部１０２、肩部１０３、および胴部１０４となる（図３）。なお、以下の説明における「上下」は、プリフォーム１の口部１０側およびボトル１００の口部１０１側を「上」、プリフォーム１の小径部４０側およびボトル１００の胴部１０４側を「下」と定義するものとする。 [Outline of preform and bottle]
A preform 1 according to this embodiment includes a mouth portion 10, a large diameter portion 20, a reduced diameter portion 30, and a small diameter portion 40, and has a test tube shape as a whole (FIG. 1). The weight of preform 1 is 15 g. Although the details of each part will be described later, when the bottle 100 is molded from the preform 1, the mouth part 10, the large diameter part 20, the reduced diameter part 30, and the small diameter part 40 of the preform 1 are each the mouth part of the bottle 100. 101, neck 102, shoulder 103 and torso 104 (FIG. 3). In the following description, "top and bottom" refers to the mouth portion 10 side of the preform 1 and the mouth portion 101 side of the bottle 100 as "top", and the small diameter portion 40 side of the preform 1 and the body portion 104 side of the bottle 100 as " shall be defined as "below".

プリフォーム１は、ポリエチレンテレフタレートの射出成形によって成形される。また、ボトル１００は、プリフォーム１の二軸延伸ブロー成形（ブロー成形の例）によって成形できる。なお、本実施形態では、ボトル１００の内容量が３５０ｍＬである例を示している。ボトル１００に充填する液体は特に限定されず、たとえば、清涼飲料水（炭酸飲料水、茶、果汁、コーヒー、ココアなど）、アルコール飲料、乳飲料などの飲料、スープや味噌汁などの液体食品、ソースや醤油などの液体調味料、などが挙げられる。 The preform 1 is molded by injection molding of polyethylene terephthalate. Also, the bottle 100 can be molded by biaxial stretch blow molding (an example of blow molding) of the preform 1 . In addition, in this embodiment, an example in which the content of the bottle 100 is 350 mL is shown. The liquid to be filled in the bottle 100 is not particularly limited. and liquid seasonings such as soy sauce.

〔プリフォームの各部の構造〕
以下では、プリフォーム１の各部の構造について説明する。口部１０は、外周面に雄ねじ部１１が形成された円筒状の形状を有する（図１）。口部１０の上部はプリフォーム１の外部に向けて開口しており、口部１０の下端部は大径部２０に連設する。なお、大径部２０との連設部には、サポートリング１２が設けられている。口部１０は、プリフォーム１からボトル１００を成形する際に延伸されない部分である。したがって口部１０の形状はボトル１００の口部１０１の形状と略同一であり、ボトル１００の使用状態において蓋部材（不図示）と螺合する。雄ねじ部１１は、かかる螺合のために設けられている。 [Structure of each part of the preform]
The structure of each part of the preform 1 will be described below. The mouth portion 10 has a cylindrical shape with a male screw portion 11 formed on the outer peripheral surface (Fig. 1). The upper portion of the mouth portion 10 is open toward the outside of the preform 1 , and the lower end portion of the mouth portion 10 is connected to the large diameter portion 20 . In addition, a support ring 12 is provided at a connecting portion with the large diameter portion 20 . The mouth portion 10 is a portion that is not stretched when the bottle 100 is molded from the preform 1 . Therefore, the shape of the mouth portion 10 is substantially the same as the shape of the mouth portion 101 of the bottle 100, and is screwed with the lid member (not shown) when the bottle 100 is in use. The male threaded portion 11 is provided for such screwing.

大径部２０は、その上端部が口部１０に連設し、その下端部が縮径部３０に連設する円筒状の部分として形成されている。本実施形態における大径部２０の内径は２０．２５ｍｍであり、これは小径部４０の内径１４．９ｍｍより大きい。また、大径部２０の肉厚は２．３ｍｍである。 The large-diameter portion 20 is formed as a cylindrical portion having an upper end connected to the mouth portion 10 and a lower end connected to the reduced-diameter portion 30 . The inner diameter of the large diameter portion 20 in this embodiment is 20.25 mm, which is larger than the inner diameter of the small diameter portion 40 of 14.9 mm. Moreover, the thickness of the large-diameter portion 20 is 2.3 mm.

縮径部３０は、その上端部が大径部２０に連設し、その下端部が小径部４０に連設する円錐台筒状の部分として形成されている（図１）。上下に連設する大径部２０および小径部４０のそれぞれの内径に大小に対応して、縮径部３０は大径部から小径部方向へ離間するに従って縮径する。より具体的には、大径部２０に連設する縮径部上部３１の内径は２０．３ｍｍであり、小径部４０に連設する縮径部下部３３の内径は１５．２ｍｍであり、縮径部上部３１および縮径部下部３３に連設する縮径部中部３２の内径は、上端部の２０．３ｍｍから下端部の１５．２ｍｍへと漸減する。 The reduced-diameter portion 30 is formed as a truncated cone-shaped portion having an upper end connected to the large-diameter portion 20 and a lower end connected to the small-diameter portion 40 (FIG. 1). Corresponding to the inner diameters of the large-diameter portion 20 and the small-diameter portion 40 that are vertically connected, the diameter-reduced portion 30 is reduced in diameter as it moves away from the large-diameter portion toward the small-diameter portion. More specifically, the inner diameter of the reduced diameter portion upper portion 31 connected to the large diameter portion 20 is 20.3 mm, and the inner diameter of the reduced diameter portion lower portion 33 connected to the small diameter portion 40 is 15.2 mm. The inner diameter of the reduced diameter middle portion 32 connected to the upper diameter portion 31 and the reduced diameter portion lower portion 33 gradually decreases from 20.3 mm at the upper end to 15.2 mm at the lower end.

図２に、大径部２０および縮径部３０の上側部分の拡大図を示す。縮径部中部３２の肉厚は１．８ｍｍであり、これは大径部２０の肉厚２．３ｍｍの７８％である。縮径部上部３１の肉厚は、その上部においては連設する大径部２０と同一の２．３ｍｍであり、その下部においては連設する縮径部中部３２と同一の１．８ｍｍである。縮径部上部３１は、その肉厚が、上端部における２．３ｍｍから下端部における１．８ｍｍへと連続的に変化するように形成されている。なお、縮径部上部３１の軸心Ｘに沿った方向の長さは１ｍｍである。 FIG. 2 shows an enlarged view of the upper portion of the large diameter portion 20 and the reduced diameter portion 30. As shown in FIG. The thickness of the central portion 32 of the reduced diameter portion is 1.8 mm, which is 78% of the thickness of the large diameter portion 20 of 2.3 mm. The thickness of the reduced-diameter upper portion 31 is 2.3 mm, which is the same as that of the large-diameter portion 20, and is 1.8 mm, which is the same as that of the middle reduced-diameter portion 32. . The diameter-reduced upper portion 31 is formed such that its thickness continuously changes from 2.3 mm at the upper end to 1.8 mm at the lower end. The length of the diameter-reduced upper portion 31 in the direction along the axis X is 1 mm.

図２に示したように、縮径部上部３１の内周部が連続的に形成されている一方で、縮径部上部３１の外周部では、大径部２０との連設部３１ａおよび縮径部中部３２との連設部３１ｂにおいて傾きが非連続に変化する。これは、縮径部上部３１における肉厚の変化が、縮径部上部３１の外周側において分担されているためである。換言すれば、軸心Ｘ方向に沿った縮径部上部３１の外径の変化率は、軸心Ｘに沿った縮径部上部３１の内径の変化率より大きい。 As shown in FIG. 2, the inner peripheral portion of the reduced diameter portion upper portion 31 is formed continuously, while the outer peripheral portion of the reduced diameter portion upper portion 31 has a portion 31a connected to the large diameter portion 20 and a reduced diameter portion 31a. The inclination changes discontinuously at the connecting portion 31 b with the diameter portion intermediate portion 32 . This is because the change in the thickness of the upper portion 31 of the reduced diameter portion is shared on the outer peripheral side of the upper portion 31 of the reduced diameter portion. In other words, the change rate of the outer diameter of the reduced diameter upper portion 31 along the X-axis direction is greater than the change rate of the inner diameter of the reduced diameter upper portion 31 along the X axis.

小径部４０は、その上端部が縮径部３０（縮径部下部３３）に連設する有底円筒状の部分として形成されている。本実施形態における小径部４０の内径は、底部４１を除き１４．９ｍｍである。また、小径部４０の肉厚は２．５ｍｍである。 The small-diameter portion 40 is formed as a bottomed cylindrical portion whose upper end portion is connected to the reduced-diameter portion 30 (reduced-diameter portion lower portion 33). The inner diameter of the small-diameter portion 40 in this embodiment is 14.9 mm except for the bottom portion 41 . Moreover, the thickness of the small-diameter portion 40 is 2.5 mm.

なお、小径部４０の肉厚が２．５ｍｍであり、縮径部中部３２の肉厚が１．８ｍｍであることに対応し、縮径部下部３３の肉厚は、上端部における１．８ｍｍから下端部における２．５ｍｍへと連続的に変化するように形成されている。 It should be noted that the thickness of the small diameter portion 40 is 2.5 mm, the thickness of the reduced diameter portion middle portion 32 is 1.8 mm, and the thickness of the reduced diameter portion lower portion 33 is 1.8 mm at the upper end. to 2.5 mm at the lower end.

〔ペットボトルの成形〕
次に、プリフォーム１からボトル１００を成形する二軸延伸ブロー成形について説明する。かかる二軸延伸ブロー成形は、公知の二軸延伸ブロー成形により実施できる。本実施形態では、二軸延伸ブロー成形に供するプリフォームとして上記の構造を有するプリフォーム１を採用することで、成形時の偏肉を抑制できる。特に、縮径部上部３１において急峻に肉厚が変化するため、縮径部上部３１はプリフォーム１の他の部分に比べて延伸を受けやすくなる。すると、縮径部上部３１の延伸を起点として縮径部３の全体が均一に延伸されやすくなり、ボトル１００の首部１０２から肩部１０３にかけて肉厚が均一になりやすい。従来のプリフォームを用いた二軸延伸ブロー成形では、ボトルの首部から肩部にかけて厚肉になる不具合が生じやすい傾向があったが、本実施形態のプリフォーム１を採用することで、この不具合を抑制しうる。 [PET bottle molding]
Next, biaxial stretch blow molding for molding the bottle 100 from the preform 1 will be described. Such biaxial stretch blow molding can be carried out by a known biaxial stretch blow molding. In this embodiment, by adopting the preform 1 having the structure described above as a preform to be subjected to biaxial stretch blow molding, uneven thickness during molding can be suppressed. In particular, since the thickness of the upper portion 31 of the diameter-reduced portion changes sharply, the upper portion 31 of the diameter-reduced portion is more likely to be stretched than other portions of the preform 1 . As a result, the entire diameter-reduced portion 3 tends to be stretched uniformly from the stretching of the diameter-reduced portion upper portion 31 as a starting point, and the wall thickness from the neck portion 102 to the shoulder portion 103 of the bottle 100 tends to be uniform. In biaxial stretch blow molding using a conventional preform, there was a tendency for the bottle to become thicker from the neck to the shoulder. can be suppressed.

〔その他の実施形態〕
最後に、本発明に係るプリフォームおよび容器成形方法のその他の実施形態について説明する。なお、以下のそれぞれの実施形態で開示される構成は、矛盾が生じない限り、他の実施形態で開示される構成と組み合わせて適用することも可能である。 [Other embodiments]
Finally, another embodiment of the preform and container molding method according to the present invention will be described. It should be noted that the configurations disclosed in the respective embodiments below can also be applied in combination with configurations disclosed in other embodiments unless there is a contradiction.

上記の実施形態では、ポリエチレンテレフタレート製のプリフォーム１を例として説明した。しかし、本発明に係るプリフォームを構成する材料は、熱可塑性樹脂である限り特に限定されない。かかる熱可塑性樹脂としては、たとえば、ポリエチレン、ポリプロピレン、ポリエチレンテレフタレートなどを採用しうる。 In the above embodiment, the preform 1 made of polyethylene terephthalate was described as an example. However, the material constituting the preform according to the present invention is not particularly limited as long as it is a thermoplastic resin. Examples of thermoplastic resins that can be used include polyethylene, polypropylene, and polyethylene terephthalate.

上記の実施形態では、プリフォーム１の重量が１５ｇである構成を例として説明した。しかし、本発明に係るプリフォームの重量は特に限定されず、成形する容器の内容量および肉厚に基づいて適宜決定されうる。ただし、本発明に係るプリフォームの重量が５～１８ｇであると、肩部の偏肉が問題になりやすい内容量が比較的小さい容器の成形において、かかる偏肉を効果的に防止しうる点で好ましい。なお、本発明に係るプリフォームの重量が１０ｇ～１８ｇであると、より好ましい。 In the above embodiment, the configuration in which the weight of the preform 1 is 15 g has been described as an example. However, the weight of the preform according to the present invention is not particularly limited, and can be appropriately determined based on the internal volume and wall thickness of the container to be molded. However, when the weight of the preform according to the present invention is 5 to 18 g, it is possible to effectively prevent such uneven thickness in molding a container with a relatively small content, which tends to cause uneven shoulder thickness. is preferred. In addition, it is more preferable that the weight of the preform according to the present invention is 10 g to 18 g.

上記の実施形態では、ボトル１００の内容量が３５０ｍＬである例について説明した。しかし、本発明に係るプリフォームを用いて成形する容器の内容量、および本発明に係る容器成形方法において成形される容器の内容量は、特に限定されない。ただし、ボトルの首部から肩部にかけて厚肉になる不具合は、より小さい内容量の容器において生じやすい傾向があるため、たとえば内容量が１００～１０００ｍＬ、特に１００～６００ｍＬの容器を成形する際に本発明に係るプリフォームおよび容器成形方法を適用すると、上記の不具合を好適に防止しうる。 In the above embodiment, an example in which the content of the bottle 100 is 350 mL has been described. However, the content of the container molded using the preform according to the present invention and the content of the container molded by the container molding method of the present invention are not particularly limited. However, the problem of thickening from the neck to the shoulder of the bottle tends to occur in containers with a smaller capacity. By applying the preform and container molding method according to the invention, the above problems can be preferably prevented.

上記の実施形態では、軸心Ｘ方向に沿った縮径部上部３１の外径の変化率が、軸心Ｘに沿った縮径部上部３１の内径の変化率より大きい構成を例として説明した。しかし、そのような構成に限定されることなく、縮径部の軸心方向に沿った縮径部上部の外径の変化率が、縮径部の軸芯方向に沿った縮径部上部の内径の変化率と等しい構成、または当該内径の変化率より小さい構成も採用されうる。 In the above-described embodiment, an example has been described in which the change rate of the outer diameter of the reduced diameter portion upper portion 31 along the axis X direction is greater than the change rate of the inner diameter of the reduced diameter portion upper portion 31 along the axis X. . However, without being limited to such a configuration, the rate of change in the outer diameter of the upper portion of the reduced diameter portion along the axial direction of the reduced diameter portion is A configuration equal to the rate of change of the inner diameter or a configuration less than the rate of change of the inner diameter may also be employed.

上記の実施形態では、大径部２０の肉厚が２．３ｍｍであり、縮径部中部３２の肉厚が１．８ｍｍであり、小径部４０の肉厚が２．５ｍｍである構成を例として説明した。しかし、本発明に係るプリフォームの各部の肉厚は、縮径部中部の肉厚が大径部の肉厚の８５％以下である限り、特に限定されない。たとえば、小径部の肉厚が、大径部または縮径部中部と同一であってもよい。ただし、小径部の肉厚が縮径部中部の肉厚より大きいと、容器の首部から肩部にかけて厚肉になる不具合をより好適に防止しうる点で好ましい。なお、本発明に係るプリフォームの各部の肉厚は、縮径部中部の肉厚が大径部の肉厚の６０％以上であることが好ましい。縮径部中部の肉厚が大径部の肉厚の６０％以上であると、プリフォームの射出成形時にショートショットなどの不具合が生じにくく、プリフォームの生産性が向上しやすい。また、大径部の肉厚に対する縮径部中部の肉厚の割合が上記の範囲内であると、ボトルの肩部の肉厚が適正になりやすい。 In the above embodiment, the thickness of the large-diameter portion 20 is 2.3 mm, the thickness of the middle reduced-diameter portion 32 is 1.8 mm, and the thickness of the small-diameter portion 40 is 2.5 mm. explained as. However, the thickness of each portion of the preform according to the present invention is not particularly limited as long as the thickness of the central portion of the reduced diameter portion is 85% or less of the thickness of the large diameter portion. For example, the thickness of the small diameter portion may be the same as that of the large diameter portion or the middle portion of the reduced diameter portion. However, if the thickness of the small-diameter portion is greater than the thickness of the central portion of the reduced-diameter portion, it is preferable in that it is possible to more preferably prevent the problem of thickening from the neck portion to the shoulder portion of the container. As for the thickness of each portion of the preform according to the present invention, it is preferable that the thickness of the central portion of the reduced diameter portion is 60% or more of the thickness of the large diameter portion. When the thickness of the central portion of the reduced diameter portion is 60% or more of the thickness of the large diameter portion, problems such as short shots are less likely to occur during injection molding of the preform, and the productivity of the preform is likely to be improved. Further, when the ratio of the thickness of the central portion of the reduced diameter portion to the thickness of the large diameter portion is within the above range, the thickness of the shoulder portion of the bottle tends to be appropriate.

その他の構成に関しても、本明細書において開示された実施形態は全ての点で例示であって、本発明の範囲はそれらによって限定されることはないと理解されるべきである。当業者であれば、本発明の趣旨を逸脱しない範囲で、適宜改変が可能であることを容易に理解できるであろう。したがって、本発明の趣旨を逸脱しない範囲で改変された別の実施形態も、当然、本発明の範囲に含まれる。 Regarding other configurations, it should be understood that the embodiments disclosed in this specification are examples in all respects, and that the scope of the present invention is not limited by them. Those skilled in the art will easily understand that modifications can be made as appropriate without departing from the scope of the present invention. Therefore, other embodiments modified without departing from the gist of the present invention are naturally included in the scope of the present invention.

本発明は、たとえば飲料容器を成形するためのプリフォームに利用することができる。 INDUSTRIAL APPLICABILITY The present invention can be used for preforms for molding beverage containers, for example.

１ ：プリフォーム
１０ ：口部
１１ ：雄ねじ部
１２ ：サポートリング
２０ ：大径部
３０ ：縮径部
３１ ：縮径部上部
３１ａ ：連設部
３１ｂ ：連設部
３２ ：縮径部中部
３３ ：縮径部下部
４０ ：小径部
４１ ：底部
Ｘ ：軸心
１００ ：ペットボトル
１０１ ：ペットボトルの口部
１０２ ：ペットボトルの首部
１０３ ：ペットボトルの肩部
１０４ ：ペットボトルの胴部 Reference Signs List 1: Preform 10: Mouth 11: Male threaded portion 12: Support ring 20: Large diameter portion 30: Reduced diameter portion 31: Upper portion of reduced diameter portion 31a: Continuing portion 31b: Continuing portion 32: Central portion of reduced diameter portion 33: Reduced Diameter Lower Part 40: Small Diameter Part 41: Bottom X: Axis 100: PET Bottle 101: Mouth of PET Bottle 102: Neck of PET Bottle 103: Shoulder of PET Bottle 104: Body of PET Bottle

Claims (5)

ブロー成形により容器を成形するためのプリフォームであって、
口部と、
前記口部に連設する円筒状の大径部と、
前記大径部に連設し、前記大径部から離間するに従って縮径する円錐台筒状の縮径部と、
前記縮径部に連設する有底円筒状の小径部と、を備え、
前記縮径部は、前記大径部に連設する縮径部上部と、前記小径部に連設する縮径部下部と、前記縮径部上部および前記縮径部下部に連設する縮径部中部と、を有し、
前記縮径部中部の肉厚は、前記大径部の肉厚の８５％以下であり、
前記縮径部上部は、その肉厚が、前記大径部に連設する部分における前記大径部と同一の肉厚から、前記縮径部中部に連設する部分における前記縮径部中部と同一の肉厚へと、連続的に変化するように形成され、
前記縮径部の軸心方向に沿った前記縮径部上部の長さは３ｍｍ以下であり、
前記縮径部の軸心方向に沿った前記縮径部上部の外径の変化率が、前記縮径部の軸心方向に沿った前記縮径部上部の内径の変化率より大きいプリフォーム。 A preform for molding a container by blow molding,
a mouth;
a cylindrical large-diameter portion connected to the mouth;
a truncated cylindrical diameter-reduced portion that is connected to the large-diameter portion and whose diameter decreases as the distance from the large-diameter portion increases;
a bottomed cylindrical small-diameter portion connected to the diameter-reduced portion;
The reduced-diameter portion includes an upper reduced-diameter portion connected to the large-diameter portion, a lower reduced-diameter portion connected to the small-diameter portion, and a reduced-diameter portion connected to the upper and lower diameter-reduced portions. having a central part and
The thickness of the central portion of the reduced diameter portion is 85% or less of the thickness of the large diameter portion,
The upper portion of the reduced-diameter portion has the same thickness as the large-diameter portion in the portion connected to the large-diameter portion, and the same thickness as the middle portion of the reduced-diameter portion in the portion connected to the middle portion of the reduced-diameter portion. Formed so as to continuously change to the same thickness,
The length of the upper portion of the reduced diameter portion along the axial direction of the reduced diameter portion is 3 mm or less ,
A preform in which a change rate of an outer diameter of the upper portion of the reduced diameter portion along the axial direction of the reduced diameter portion is greater than a rate of change of an inner diameter of the upper portion of the reduced diameter portion along the axial direction of the reduced diameter portion . 前記小径部の肉厚は、前記縮径部中部の肉厚より大きい請求項１に記載のプリフォーム。 2. The preform according to claim 1 , wherein the thickness of the small diameter portion is greater than the thickness of the central portion of the reduced diameter portion. 重量が５～１８ｇである請求項１または２に記載のプリフォーム。 A preform according to claim 1 or 2, having a weight of 5 to 18 g. 請求項１～３のいずれか１項に記載のプリフォームをブロー成形して容器を成形する容器成形方法。 A container molding method comprising blow molding the preform according to any one of claims 1 to 3 to mold a container. 前記容器の内容量が１００～１０００ｍＬである請求項４に記載の容器成形方法。 5. The container molding method according to claim 4 , wherein the content of the container is 100 to 1000 mL.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7466107B2 (en) 2020-10-19 2024-04-12 パナソニックＩｐマネジメント株式会社 Electric opening and closing body

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022114075A1 (en) 2020-11-26 2022-06-02 株式会社デンソー Rotor and rotating electric machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009045877A (en) 2007-08-22 2009-03-05 Dainippon Printing Co Ltd Preform for molding plastic bottle
JP2010247336A (en) 2009-04-10 2010-11-04 Toyo Seikan Kaisha Ltd Compression molding die for preform, method of manufacturing synthetic resin blow-molded container, and preform
JP2013510015A (en) 2009-11-06 2013-03-21 ネステク ソシエテ アノニム Preforms and containers with reinforcing elements
JP2014504219A (en) 2010-12-10 2014-02-20 ネステク ソシエテ アノニム Single step process of container forming and filling

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4292918B2 (en) * 2003-08-22 2009-07-08 東洋製罐株式会社 Preforms for plastic bottle containers
US8486325B2 (en) * 2006-09-15 2013-07-16 Alpla Werke Alwin Lehner Gmbh & Co. Kg Parison and method for the production of plastic bottles
JP5817409B2 (en) * 2011-10-04 2015-11-18 大日本印刷株式会社 Method for manufacturing preform and plastic bottle
JP5382162B2 (en) * 2012-04-10 2014-01-08 東洋製罐株式会社 Plastic container with excellent decoration
JP6137900B2 (en) * 2013-03-27 2017-05-31 日本山村硝子株式会社 Preform and molding method of resin container
JP2016013664A (en) * 2014-07-03 2016-01-28 北海製罐株式会社 Preform
JP2018150077A (en) * 2017-03-15 2018-09-27 大日本印刷株式会社 Plastic bottle and manufacturing method of plastic bottle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009045877A (en) 2007-08-22 2009-03-05 Dainippon Printing Co Ltd Preform for molding plastic bottle
JP2010247336A (en) 2009-04-10 2010-11-04 Toyo Seikan Kaisha Ltd Compression molding die for preform, method of manufacturing synthetic resin blow-molded container, and preform
JP2013510015A (en) 2009-11-06 2013-03-21 ネステク ソシエテ アノニム Preforms and containers with reinforcing elements
JP2014504219A (en) 2010-12-10 2014-02-20 ネステク ソシエテ アノニム Single step process of container forming and filling

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7466107B2 (en) 2020-10-19 2024-04-12 パナソニックＩｐマネジメント株式会社 Electric opening and closing body

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