JP6367641B2 - Composite container and manufacturing method thereof - Google Patents

Composite container and manufacturing method thereof Download PDF

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JP6367641B2
JP6367641B2 JP2014156923A JP2014156923A JP6367641B2 JP 6367641 B2 JP6367641 B2 JP 6367641B2 JP 2014156923 A JP2014156923 A JP 2014156923A JP 2014156923 A JP2014156923 A JP 2014156923A JP 6367641 B2 JP6367641 B2 JP 6367641B2
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paper
mold
composite container
paper tube
circumferential direction
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JP2016033040A (en
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真一 田端
真一 田端
満 塩川
満 塩川
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Yoshino Kogyosho Co Ltd
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Description

本発明は、合成樹脂製容器本体と紙筒とを組み合わせた複合容器及びその製造方法に関し、特に、製造工程を簡略化するためにインモールド成形を行った場合であっても、良好な外観を有する複合容器を提供しようとするものである。   The present invention relates to a composite container in which a synthetic resin container main body and a paper tube are combined and a method for manufacturing the same, and in particular, even when in-mold molding is performed to simplify the manufacturing process, a good appearance is achieved. It is intended to provide a composite container having.

環境保護やコストの削減を目的として、合成樹脂製の容器本体の薄肉化を図る取り組みが行われている。このようなものとして特許文献１には、薄肉化によって低減することになるボトル状の容器本体の剛性を、該容器本体の外周面に装着される紙筒で補うようにした複合容器が示されている。   In order to protect the environment and reduce costs, efforts are being made to reduce the thickness of synthetic resin container bodies. As such, Patent Document 1 discloses a composite container in which the rigidity of a bottle-shaped container body that is reduced by thinning is supplemented by a paper tube attached to the outer peripheral surface of the container body. ing.

特許第３７５０８４４号公報Japanese Patent No. 3750844

前述したような従来の複合容器は、容器本体を成形した後、別途作成しておいた紙筒を被せて作られており、両者を組み合わせる工程を要するため、コスト削減に限界を来していた。   The conventional composite container as described above is made by covering a separately prepared paper cylinder after the container body is molded, and a process for combining the two is required, so the cost reduction has been reached. .

また、このような複合容器を、内部に予め紙筒を配置した金型により容器本体を成形する、所謂インモールド成形により形成する場合には、伸縮変形を生じない紙を材質としているため、紙筒と容器本体との寸法精度を高度に保つ必要があった。例えば、目的とする容器本体の径より紙筒の径が小さい場合には、紙筒が破損したり、容器本体が不良形状となる問題があった。   In addition, when such a composite container is formed by so-called in-mold molding, in which a container body is formed by a mold in which a paper tube is previously disposed, since the material does not cause expansion and contraction, the paper It was necessary to maintain a high degree of dimensional accuracy between the cylinder and the container body. For example, when the diameter of the paper tube is smaller than the intended diameter of the container body, there is a problem that the paper tube is damaged or the container body is in a defective shape.

本発明は、前記の現状に鑑み開発されたもので、製造工程を簡略化するためにインモールド成形を行った場合であっても、良好な外観を有する複合容器を提供することを目的とする。   The present invention has been developed in view of the above-described present situation, and an object thereof is to provide a composite container having a good appearance even when in-mold molding is performed in order to simplify the manufacturing process. .

すなわち、本発明の要旨構成は以下のとおりである。
１．合成樹脂製容器本体と紙筒とを組み合わせた複合容器において、前記紙筒は、前記容器本体の外周面にインモールド成形によって装着されており、前記紙筒は、矩形状の紙片を丸めて、周方向の一方の端縁に形成した少なくとも１つの突起を、周方向の他方の端縁に形成した少なくとも１つのスリットに挿入することで形成され、前記突起は、前記インモールド成形時に前記スリット内を周方向に移動可能であることを特徴とする複合容器。
That is, the gist configuration of the present invention is as follows.
1. In a composite container in which a synthetic resin container body and a paper tube are combined, the paper tube is attached to the outer peripheral surface of the container body by in-mold molding, and the paper tube rolls a rectangular piece of paper, At least one protrusion formed on one edge in the circumferential direction is inserted into at least one slit formed on the other edge in the circumferential direction, and the protrusion is formed in the slit during the in-mold molding . A composite container characterized by being movable in the circumferential direction.

２．合成樹脂製容器本体と紙筒とを組み合わせた複合容器の製造方法において、矩形状の紙片を丸めて、周方向の一方の端縁に形成した突起を、周方向の他方の端縁に形成したスリットに、前記突起が前記スリット内を周方向に移動可能となるように挿入することで形成された紙筒を金型内に配置し、前記金型内において前記紙筒の内側に配置されたプリフォーム又はパリソンをブロー成形することで、前記紙筒を前記容器本体の外周面に装着することを特徴とする複合容器の製造方法。 2. In a method for manufacturing a composite container combining a synthetic resin container body and a paper tube, a rectangular paper piece is rounded, and a protrusion formed on one edge in the circumferential direction is formed on the other edge in the circumferential direction. A paper cylinder formed by inserting the protrusion into the slit so as to be movable in the circumferential direction in the slit is disposed in the mold, and is disposed inside the paper cylinder in the mold. A method of manufacturing a composite container, wherein the paper tube is mounted on an outer peripheral surface of the container body by blow-molding a preform or a parison.

ここに、「ブロー成形」とは、射出成形によって形成されたプリフォームをブロー成形する二軸延伸ブロー成形や、押出された筒状のパリソンを金型で挟み込んだ後にブロー成形する押出ブロー成形を含むものとする。   Here, “blow molding” refers to biaxial stretch blow molding in which a preform formed by injection molding is blow molded, or extrusion blow molding in which an extruded cylindrical parison is sandwiched between molds and then blow molded. Shall be included.

前記の複合容器及び複合容器の製造方法によれば、金型内に紙筒を配置し、プリフォーム又はパリソンをブロー成形するインモールド成形によって複合容器を形成するようにして製造工程を簡略化するに際し、ブロー成形時における紙筒の損傷の発生を効果的に防止することができる。すなわち、ブロー成形に際し、突起がスリット内を周方向に移動可能であることにより、容器本体の胴部を形成しようとするプリフォーム又はパリソンの拡径変形に紙筒が追随して拡径変形し、成形完了時に要求される周長を安定して実現することが可能となる。   According to the composite container and the method for manufacturing the composite container, the manufacturing process is simplified by arranging the paper tube in the mold and forming the composite container by in-mold molding in which a preform or a parison is blow-molded. In doing so, it is possible to effectively prevent damage to the paper tube during blow molding. That is, during blow molding, the protrusion is movable in the circumferential direction in the slit, so that the paper cylinder follows the diameter expansion deformation of the preform or the parison for forming the body portion of the container main body, and the diameter expansion deformation occurs. Thus, it is possible to stably realize the circumference required at the completion of molding.

また、複合容器の製造方法においては、ブロー成形の加圧媒体として気体を用いることができることは言うまでもなく、気体に代えて液体を用いてもよい。   Moreover, in the manufacturing method of a composite container, it cannot be overemphasized that gas can be used as a pressure medium of blow molding, and it may replace with gas and may use liquid.

したがって、本発明に従う複合容器及び複合容器の製造方法によれば、製造工程を簡略化するためにインモールド成形を行った場合であっても、良好な外観を有する複合容器を提供することができる。   Therefore, according to the composite container and the composite container manufacturing method according to the present invention, a composite container having a good appearance can be provided even when in-mold molding is performed in order to simplify the manufacturing process. .

本発明の一実施形態に係る複合容器を示す斜視図である。It is a perspective view which shows the composite container which concerns on one Embodiment of this invention. 本発明における紙筒の変形例を示す斜視図である。It is a perspective view which shows the modification of the paper cylinder in this invention.

以下、図１を参照して、本発明の一実施形態に係る複合容器１について詳細に例示説明する。なお、本明細書において、「上」とは複合容器１の底部２１に対し口部２４が位置する側であり、「下」とはその逆側である。   Hereinafter, with reference to FIG. 1, the composite container 1 which concerns on one Embodiment of this invention is illustrated and demonstrated in detail. In the present specification, “upper” is the side where the mouth 24 is located with respect to the bottom 21 of the composite container 1, and “lower” is the opposite side.

図１に示すように、本実施形態に係る複合容器１は、合成樹脂製容器本体２０と、紙筒３０とで構成されている。容器本体２０は、中央が***した円板状をなす底部２１の外周縁から立ち上がる円筒状の胴部２２の上端縁に、上方に向って縮径する肩部２３を介して円筒状の口部２４を立設してなるボトル状をなしている。なお、本実施形態において、胴部２２は上方に向かってわずかに拡径するテーパ状をなしている。口部２４には、円環状のネックリング２５が形成されている。   As shown in FIG. 1, the composite container 1 according to this embodiment includes a synthetic resin container body 20 and a paper tube 30. The container body 20 has a cylindrical mouth portion via a shoulder portion 23 whose diameter is reduced upward at an upper end edge of a cylindrical body portion 22 rising from an outer peripheral edge of a bottom portion 21 having a disk shape with a raised center. 24 is standing in a bottle shape. In the present embodiment, the body portion 22 has a tapered shape that slightly increases in diameter upward. An annular neck ring 25 is formed in the mouth 24.

紙筒３０は、容器本体２０の胴部２２における上端縁２２ａから下端縁２２ｂにわたる外周面に装着されている。紙筒３０は、矩形状の紙片を丸めて、周方向の一方の端縁（縁部）から突出するように形成した少なくとも１つの突起３１を、周方向の他方の端縁（縁部から内側にずれた位置）に形成した少なくとも１つのスリット３２に挿入することで形成されている。このとき、紙片の端縁同士は所定の範囲で重ね合わされている。なお、本実施形態では、４つの突起３１及び４つのスリット３２が、それぞれ、上下方向に沿って等間隔に配置されている。各突起３１は、対応するスリット３２からの抜け出しを防止する爪部３１ａを有しており、突起３１のスリット３２からの抜け出しが防止されるように形成されている。また、爪部３１ａの内縁部（紙片の縁部と対向する辺部分）と紙片の縁部との間には所定の間隔ｇが設けられており、この間隔ｇが、二軸延伸ブロー成形に際して、突起３１がスリット３２内を周方向に移動可能な距離となっている。   The paper tube 30 is mounted on the outer peripheral surface of the body portion 22 of the container body 20 from the upper end edge 22a to the lower end edge 22b. The paper tube 30 is formed by rolling a rectangular paper piece and forming at least one protrusion 31 formed so as to protrude from one end edge (edge) in the circumferential direction. It is formed by being inserted into at least one slit 32 formed at a position shifted to the position. At this time, the edges of the paper pieces are overlapped with each other within a predetermined range. In the present embodiment, the four protrusions 31 and the four slits 32 are arranged at equal intervals along the vertical direction. Each projection 31 has a claw portion 31a that prevents the projection 31 from coming out of the corresponding slit 32, and is formed so that the projection 31 is prevented from coming out from the slit 32. In addition, a predetermined gap g is provided between the inner edge of the claw portion 31a (side part facing the edge of the paper piece) and the edge of the paper piece, and this gap g is used for biaxial stretch blow molding. The protrusion 31 has a distance that can move in the circumferential direction in the slit 32.

そして、複合容器１は、金型内に紙筒３０を配置し、気体や液体を加圧媒体としてプリフォームを二軸延伸ブロー成形することで、紙筒３０が容器本体２０の胴部２２外周面に装着されて形成されている。金型内に紙筒３０を配置するに際しては、まず、紙筒３０を構成する紙片を丸めて、各突起３１を対応する各スリット３２に挿入し、図示したような筒状をなす紙筒３０とし、該紙筒３０を金型内に配置する。金型は、例えば、複数の割型によって構成される上型と単一の下型とによって構成することができる。この場合、紙筒３０を金型内に配置し、射出成形によって形成され、ブロー成形に適した温度に保たれたプリフォームを配置して型締めすることで、プリフォームを二軸延伸ブロー成形することができる。   And the composite container 1 arrange | positions the paper cylinder 30 in a metal mold | die, and biaxially-stretch-blow-molds a preform using gas or a liquid as a pressurization medium, and the paper cylinder 30 is outer periphery of the trunk | drum 22 of the container main body 20 It is attached to the surface and formed. When disposing the paper cylinder 30 in the mold, first, a piece of paper constituting the paper cylinder 30 is rounded, and each protrusion 31 is inserted into the corresponding slit 32 to form a cylindrical paper cylinder 30 as illustrated. The paper tube 30 is placed in the mold. A metal mold | die can be comprised with the upper mold | type comprised by several split mold, and the single lower mold | type, for example. In this case, the preform is biaxially stretched by placing the paper cylinder 30 in the mold, placing the preform formed by injection molding and maintaining the temperature suitable for blow molding, and clamping the mold. can do.

プリフォームは、試験管状をなす本体部の上部にネックリングを有している。二軸延伸ブロー成形に際しては、プリフォームの本体部の口部から延伸ロッドを挿入し、該本体部の底部を下方に延伸させると共に、該本体部の口部から加圧媒体を導入することで、該本体部の周壁部を径方向外側に延伸させることができる。なお、二軸延伸ブロー成形に際しては、必ずしも延伸ロッドを用いる必要はなく、例えば、プリフォームの本体部の口部から加圧媒体を導入することで、該本体部の底部を下方に延伸させると共に該本体部の周壁部を径方向外側に延伸させてもよい。また、金型における、紙筒３０の上端縁外周面に対応する位置には、周方向に延びる複数の横溝が形成されており、二軸延伸ブロー成形の結果、紙筒３０及び容器本体２０には、該横溝に対応する複数の突条３３が形成されている。   The preform has a neck ring at the upper part of the main body part forming a test tube. In biaxial stretch blow molding, a stretch rod is inserted from the mouth of the main body of the preform, the bottom of the main body is stretched downward, and a pressurized medium is introduced from the mouth of the main body. The peripheral wall of the main body can be extended radially outward. In biaxial stretch blow molding, it is not always necessary to use a stretching rod. For example, by introducing a pressure medium from the mouth of the preform body, the bottom of the body is stretched downward. The peripheral wall portion of the main body portion may be extended radially outward. Further, a plurality of lateral grooves extending in the circumferential direction are formed at positions corresponding to the outer peripheral surface of the upper end edge of the paper tube 30 in the mold, and as a result of biaxial stretch blow molding, the paper tube 30 and the container body 20 are Are formed with a plurality of protrusions 33 corresponding to the lateral grooves.

本実施形態によれば、金型内に紙筒３０を配置し、プリフォームを二軸延伸ブロー成形することで複合容器１を形成するため、二軸延伸ブロー成形後に別途、紙筒３０を装着する工程を設ける必要がない。   According to the present embodiment, the paper tube 30 is disposed in the mold, and the composite container 1 is formed by biaxial stretch blow molding of the preform. Therefore, the paper tube 30 is separately attached after the biaxial stretch blow molding. There is no need to provide a process to perform.

また、紙筒３０を、矩形状の紙片を丸めて、周方向の一方の端縁に形成した少なくとも１つの突起３１を、周方向の他方の端縁に形成した少なくとも１つのスリット３２に挿入することで形成しており、前記一方の端縁と他方の端縁との重ね合わせ部分が形成されている。前記重ね合わせ部分の幅ｗは、爪部３１ａの内縁部（紙片の縁部と対向する辺部分）と紙片の縁部との間に設けられた所定の間隔ｇ以上となっているため、紙筒が拡径しても、紙筒に隙間が生じることがない。   Further, at least one protrusion 31 formed on one end edge in the circumferential direction is inserted into at least one slit 32 formed on the other end edge in the circumferential direction by rounding a rectangular paper piece of the paper tube 30. The overlapping part of the one end edge and the other end edge is formed. Since the width w of the overlapped portion is equal to or greater than a predetermined gap g provided between the inner edge of the claw portion 31a (side portion facing the edge of the paper piece) and the edge of the paper piece, Even if the diameter of the tube is increased, no gap is generated in the paper tube.

また、二軸延伸ブロー成形に際し、各突起３１が、対応するスリット３２内を周方向に移動可能であることにより、容器本体２０の胴部２２を形成しようとするプリフォームの拡径変形に紙筒３０が追随して拡径変形し、成形完了時に要求される周長を安定して実現することが可能となる。したがって、二軸延伸ブロー成形時における紙筒３０の損傷の発生を効果的に防止することができる。   Further, in the biaxial stretch blow molding, each protrusion 31 is movable in the circumferential direction in the corresponding slit 32, so that the paper can be used for the expansion deformation of the preform to form the body portion 22 of the container body 20. The diameter of the tube 30 is increased and deformed, and the circumference required at the completion of molding can be stably realized. Therefore, it is possible to effectively prevent the paper tube 30 from being damaged during the biaxial stretch blow molding.

なお、前述したところは本発明の一実施形態を示したにすぎず、特許請求の範囲において、種々の変更を加えることができることは言うまでもない。
例えば、図２（ａ）に示すように、紙筒３０は容器本体２０の胴部２２全体を覆うものではなく、一部を覆うものでもよく、肩部２３を覆うものでも良い。
さらに、突起３１は、その先端に下方に向けて突出する爪部３１ａを設け、概略Ｌ字状となっているが、上方に向けて爪部３１ａを突出してもよく、さらには、図２（ｂ）に示すように、爪部３１ａを上下両方向に突出させ、概略Ｔ字状としてもよい。
また、ブロー成形としては、プリフォームをブロー成形する二軸延伸ブロー成形を用いているが、押出された筒状のパリソンを金型で挟み込んだ後にブロー成形する押出ブロー成形を用いてもよい。 In addition, the place mentioned above only showed one Embodiment of this invention, and it cannot be overemphasized that a various change can be added in a claim.
For example, as shown in FIG. 2A, the paper tube 30 does not cover the entire body portion 22 of the container body 20, but may cover a part thereof or may cover the shoulder portion 23.
Further, the protrusion 31 is provided with a claw portion 31a protruding downward at the tip thereof, and is generally L-shaped. However, the claw portion 31a may protrude upward, and FIG. As shown in b), the claw portion 31a may be protruded in both the upper and lower directions to have a substantially T-shape.
In addition, as the blow molding, biaxial stretch blow molding in which a preform is blow-molded is used, but extrusion blow molding in which an extruded cylindrical parison is sandwiched between molds and then blow-molded may be used.

１ 複合容器
２０ 容器本体
２１ 底部
２２ 胴部
２２ａ 胴部の上端縁
２２ｂ 胴部の下端縁
２３ 肩部
２４ 口部
２５ ネックリング
３０ 紙筒
３１ 突起
３１ａ 爪部
３２ スリット
３３ 突条
ｇ 間隔（突起がスリット内を周方向に移動可能な距離）
ｗ 重ね合わせ部分の幅 DESCRIPTION OF SYMBOLS 1 Composite container 20 Container main body 21 Bottom part 22 Body part 22a Upper end edge of the trunk part 22b Lower end edge of the trunk part 23 Shoulder part 24 Mouth part 25 Neck ring 30 Paper tube 31 Projection 31a Claw part 32 Slit 33 Projection g Distance that can move in the circumferential direction in the slit)
w Width of overlapping part

Claims (2)

合成樹脂製容器本体と紙筒とを組み合わせた複合容器において、
前記紙筒は、前記容器本体の外周面にインモールド成形によって装着されており、
前記紙筒は、矩形状の紙片を丸めて、周方向の一方の端縁に形成した少なくとも１つの突起を、周方向の他方の端縁に形成した少なくとも１つのスリットに挿入することで形成され、前記突起は、前記インモールド成形時に前記スリット内を周方向に移動可能であることを特徴とする複合容器。 In a composite container combining a synthetic resin container body and a paper tube,
The paper tube is mounted on the outer peripheral surface of the container body by in-mold molding ,
The paper tube is formed by rolling a rectangular paper piece and inserting at least one protrusion formed on one circumferential edge into at least one slit formed on the other circumferential edge. The projection is movable in the circumferential direction in the slit during the in-mold molding . 合成樹脂製容器本体と紙筒とを組み合わせた複合容器の製造方法において、
矩形状の紙片を丸めて、周方向の一方の端縁に形成した突起を、周方向の他方の端縁に形成したスリットに、前記突起が前記スリット内を周方向に移動可能となるように挿入することで形成された紙筒を金型内に配置し、
前記金型内において前記紙筒の内側に配置されたプリフォーム又はパリソンをブロー成形することで、前記紙筒を前記容器本体の外周面に装着することを特徴とする複合容器の製造方法。 In the manufacturing method of a composite container combining a synthetic resin container body and a paper tube,
A rectangular piece of paper is rolled up so that a protrusion formed on one edge in the circumferential direction is moved to a slit formed on the other edge in the circumferential direction so that the protrusion can move in the circumferential direction in the slit. Place the paper cylinder formed by inserting in the mold,
A method for manufacturing a composite container, comprising: blow molding a preform or a parison disposed inside the paper cylinder in the mold to mount the paper cylinder on the outer peripheral surface of the container body.
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