JP6730824B2 - Polyester resin blow molding multiplex bottle - Google Patents
Polyester resin blow molding multiplex bottle Download PDFInfo
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Description
本発明は、ポリエステル樹脂製ブロー成形多重ボトルに関する。 The present invention relates to a blow molding multiplex bottle made of polyester resin.
従来、外圧に対して原形復帰可能な外郭ボトルの内部に、外圧により変形されて減容する（以下、「減容変形」ということがある）内容器体を配置し、該外郭ボトルと該内容器体との間に外気が導入されるようにしたブロー成形多重ボトルが知られている。前記ブロー成形多重ボトルは、例えば、ポリエステル樹脂の射出成形により内プリフォーム及び外プリフォームを形成し、外プリフォームの内周側に内プリフォームを配置した状態でブロー成形することにより製造される。 Conventionally, an inner container body that is deformed and reduced in volume by external pressure (hereinafter, may be referred to as “volume reduction deformation”) is disposed inside an outer casing that can return to its original shape with respect to external pressure. A blow-molded multiple bottle in which outside air is introduced between the container and the container is known. The blow-molded multiple bottle is manufactured, for example, by forming an inner preform and an outer preform by injection molding of a polyester resin, and blow-molding the inner preform arranged on the inner peripheral side of the outer preform. ..
前記ブロー成形多重ボトルは、外郭ボトルの胴部を押圧することにより、内容器体を減容変形させて内容器体に収容されている内容物を注出する一方、押圧が解除されると別途設けられた逆止弁等の作用により外郭ボトルと内容器体との間に外気が導入される。この結果、外気圧により外郭ボトルが原形復帰する一方、前記内容器体は減容変形された状態が維持される。このようにするときには、内容器体内に外気が侵入することが無いので、内容器体内に収容されている内容物が酸化等により変質することを防止することができる。 The blow-molded multi-bottle is configured such that by pressing the body portion of the outer bottle, the inner container body is volume-deformed and the contents contained in the inner container body are poured out, while the pressing is released separately. Outside air is introduced between the outer shell bottle and the inner container body by the action of a check valve or the like provided. As a result, the outer bottle is restored to its original shape by the external air pressure, while the inner container body is maintained in the volume-deformed state. In this case, since the outside air does not enter the inner container body, it is possible to prevent the contents contained in the inner container body from being deteriorated due to oxidation or the like.
ところで、前記ブロー成形多重ボトルは、前述のようにして内容器体を減容変形させる際にボトル底部で前記外郭ボトルから前記内容器体が剥離すると、所期の減容変形が困難になり、内容物を十分に注出することができなくなることがあるという問題がある。 By the way, the blow-molded multiple bottles, when the inner container body is peeled from the outer bottle at the bottom of the bottle when the inner container body is deformed and reduced in volume as described above, it becomes difficult for the intended volume deformation. There is a problem that the contents may not be able to be sufficiently poured out.
前記問題を解決するために、ボトル底部において、前記外郭ボトルで前記内容器体を挟み込んで一体的に保持する保持リブを備えるブロー成形多重ボトルが知られている（例えば、特許文献１参照）。 In order to solve the above problem, there is known a blow-molded multiple bottle having a holding rib that sandwiches the inner container body by the outer bottle and integrally holds the inner container body at the bottom of the bottle (see, for example, Patent Document 1).
しかしながら、前記従来のブロー成形多重ボトルでは、前記外郭ボトルで前記内容器体を挟み込む構成を形成するために、前記保持リブに外力を加える必要がある。前記外力は、例えばブロー成形する際に金型のピンチオフ部に突設されたピンにより加えられるが、このようにするときには前記ブロー成形多重ボトルの製造に用いる装置の構成が複雑になるという不都合がある。 However, in the conventional blow-molded multiplex bottle, it is necessary to apply an external force to the holding rib in order to form a configuration in which the inner container body is sandwiched by the outer shell bottle. The external force is applied, for example, by a pin protruding from the pinch-off portion of the mold during blow molding. However, in this case, there is a disadvantage that the structure of the apparatus used for manufacturing the blow molded multiple bottle becomes complicated. is there.
本発明は、かかる不都合を解消して、構成の簡単な装置により製造することができ、ボトル底部における外郭ボトルからの内容器体の剥離を確実に防止することができるポリエステル樹脂製ブロー成形多重ボトルを提供することを目的とする。 The present invention eliminates such inconvenience, can be manufactured by a device having a simple structure, and can reliably prevent the inner container body from peeling from the outer bottle at the bottom of the bottle. A blow molding multiplex bottle made of polyester resin. The purpose is to provide.
かかる目的を達成するために、本発明のポリエステル製ブロー成形多重ボトルは、円筒状外口部と、該外口部に連接する肩部と、該肩部に連接する胴部と、該胴部に連接し内周側でボトル内に膨出する凹部を有する底部とを備え、外圧に対して原形復帰可能な外郭ボトルと、該外郭ボトルの該円筒状外口部の内周側に配設される円筒状内口部と、該内口部に連接し該外郭ボトルの内面形状に沿う形状の内容器体本体とを備え、外圧により変形する内容器体と、該外口部と該内口部との間に形成されて該外郭ボトルと該内容器体との間に外気を導入する通気路とを備えるポリエステル樹脂製ブロー成形多重ボトルにおいて、前記凹部は、錐台状凹部が複数段積層された形状を備え、少なくとも該錐台状凹部の最下段が多角錐台状であることを特徴とする。 In order to achieve such an object, the polyester blow-molded multiple bottle of the present invention comprises a cylindrical outer mouth portion, a shoulder portion connected to the outer mouth portion, a body portion connected to the shoulder portion, and the body portion. An outer shell which is connected to the inner shell and has a recessed portion that bulges into the bottle on the inner circumference side, is capable of returning to its original shape with respect to external pressure, and is disposed on the inner circumference side of the cylindrical outer opening portion of the outer bottle. An inner container body that is connected to the inner mouth part and has a shape that follows the inner surface shape of the outer shell and that is deformed by external pressure; the outer mouth part and the inner part; In a blow molding multiplex bottle made of polyester resin, which is formed between a mouth portion and a ventilation path for introducing outside air between the outer bottle and the inner container body, the concave portion has a plurality of frustum-shaped concave portions. It has a laminated shape, and at least the lowermost step of the frustum-shaped recess is a polygonal frustum.
本発明のポリエステル樹脂製ブロー成形多重ボトルは、ポリエステル樹脂の射出成形により形成された外プリフォームの内周側に、同様にして内プリフォームを配置した状態でブロー成形することにより製造することができ、外圧に対して原形復帰可能な外郭ボトルと、該外郭ボトルの内部に配置され、外圧により変形する内容器体とからなる。また、本発明のポリエステル樹脂製ブロー成形多重ボトルは、前記外郭ボトルと前記内容器体との間に外気を導入する通気路を備えている。 The polyester resin blow molding multiplex bottle of the present invention can be manufactured by blow molding with the inner preform similarly arranged on the inner peripheral side of the outer preform formed by injection molding of the polyester resin. The outer bottle is capable of returning to its original shape with respect to an external pressure, and an inner container body disposed inside the outer bottle and deformable by the external pressure. The blow molding multiplex bottle made of polyester resin of the present invention is provided with a ventilation path for introducing outside air between the outer bottle and the inner container body.
本発明のポリエステル樹脂製ブロー成形多重ボトルは、前記外口部及び内口部を下方に向けて前記外郭ボトルの胴部を押圧することにより、前記内容器体の内容器体本体が減容変形して内容物が注出される。次に、前記外郭ボトルの胴部の押圧を解除すると、該外郭ボトルと前記内容器体本体との間に前記通気路から外気が導入され、外気圧により該外郭ボトルは原形に復帰するが該内容器体本体は減容変形したままの状態が維持される。 The polyester resin blow-molded multiplex bottle of the present invention is such that the inner container body of the inner container body is deformed by pressing the body portion of the outer bottle with the outer mouth portion and the inner mouth portion facing downward. Then the contents are poured out. Next, when the pressing of the body portion of the outer shell is released, outside air is introduced from the air passage between the outer bottle and the inner container body, and the outer bottle returns to its original shape due to the external pressure. The inner container body is maintained in a state in which the volume is reduced and deformed.
このとき、本発明のポリエステル樹脂製ブロー成形多重ボトルでは、前記底部が、その内周側に、錐台状凹部が複数段積層された形状を備え、少なくとも該錐台状凹部の最下段が多角錐台状となっている。前記凹部は、前記形状を備えることにより、前記ブロー成形の際に前記内プリフォームが前記外プリフォームに熱圧着されることとなり、該凹部において、前記内容器体が前記外郭ボトルに密着される。 In this case, in the polyester resin blow-molded multiplex bottle of the present invention, the bottom portion has a shape in which a plurality of frustum-shaped recesses are laminated on the inner peripheral side thereof, and at least the bottommost step of the frustum-shaped recesses is large. It has a truncated pyramid shape. Since the recess has the shape, the inner preform is thermocompression-bonded to the outer preform during the blow molding, and the inner container body is brought into close contact with the outer bottle in the recess. ..
前記凹部は、前述のように前記内容器体が前記外郭ボトルに密着されている上、錐台状凹部が複数段積層されているので多数の段差部を備え、少なくともその最下段が多角錐台状であることにより多数の屈曲部を備える形状となっている。このため、前記凹部は、前記通気路から導入された外気が前記内容器体と前記外郭ボトルとの間に侵入しにくくなっており、該外郭ボトルから該内容器体が剥離することを確実に防止することができる。 As described above, the concave portion is provided with a large number of step portions because the inner container body is in close contact with the outer bottle and a plurality of frustum-shaped concave portions are stacked, and at least the lowest step thereof is a polygonal truncated pyramid. The shape is a shape having a large number of bent portions. For this reason, the concave portion makes it difficult for the outside air introduced from the air passage to enter between the inner container body and the outer bottle, and ensures that the inner container body is peeled from the outer bottle. Can be prevented.
尚、前記錐台状凹部は、少なくともその最下段が多角錐台状であればよく、最下段以外の段は多角錐台状であってもよく、円錐台状であってもよい。 In addition, at least the lowermost step of the frustum-shaped recess may be a polygonal frustum shape, and the steps other than the lowest step may be a polygonal frustum shape or a truncated cone shape.
また、本発明のポリエステル樹脂製ブロー成形多重ボトルは、前記凹部に前記形状を付与する金型を用い、前記外プリフォームの内周側に前記内プリフォームを配置した状態で、単にブロー成形するだけでよく、容易に製造することができる。 The polyester resin blow-molded multiple bottle of the present invention is simply blow-molded in a state where the inner preform is arranged on the inner peripheral side of the outer preform by using a mold that imparts the shape to the recess. It is enough and can be easily manufactured.
また、本発明のポリエステル樹脂製ブロー成形多重ボトルは、前記凹部が、多角錐台状凹部が複数段積層された形状を備えることが好ましい。 In the blow molding multiplex bottle made of polyester resin of the present invention, it is preferable that the concave portion has a shape in which a plurality of truncated pyramidal concave portions are stacked.
前記凹部は、前記多角錐台状凹部が複数段積層された構成を備えることにより、多数の段差部と屈曲部とを備えることができ、ブロー成形の際に前記内容器体と前記外郭ボトルとの密着性を向上させることができる一方、前記通気路から導入された外気が該内容器体と該外郭ボトルとの間に侵入することをさらに効果的に阻止することができる。 The concave portion can be provided with a large number of step portions and bent portions by providing a configuration in which the polygonal truncated pyramidal concave portions are laminated in a plurality of stages, and the inner container body and the outer bottle can be provided at the time of blow molding. On the other hand, it is possible to further effectively prevent the outside air introduced from the ventilation passage from entering between the inner container body and the outer shell bottle.
次に、添付の図面を参照しながら本発明の実施の形態についてさらに詳しく説明する。 Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.
図１及び図２に示すように、本実施形態のポリエステル樹脂製ブロー成形多重ボトル１（以下、多重ボトル１と略記する）は、外圧に対して原形復帰可能な外郭ボトル２と、外郭ボトル２の内側に収容され外圧により変形する内容器体３とからなる。 As shown in FIGS. 1 and 2, a polyester resin blow-molded multiplex bottle 1 (hereinafter abbreviated as multiplex bottle 1) of the present embodiment includes an outer shell bottle 2 and an outer shell bottle 2 that can return to their original shapes with respect to external pressure. And an inner container body 3 that is housed inside and deforms due to external pressure.
外郭ボトル２は、例えば、円筒状外口部４と、外口部４に連接する四角錐状の肩部５と、肩部５に連接する四角筒状の上胴部６と、上胴部６に連接する円筒状の中胴部７と、中胴部７に連接する四角筒状の下胴部８と、下胴部８に連接する四角錐状の底部９とを備え、上胴部６、中胴部７、下胴部８により胴部が形成されている。外口部４は外周面に雄ねじ部１０と、サポートリング１１とを備え、底部９は外郭ボトル２の内側に膨出して多重ボトル１に自立性を付与する凹部１２を備えている。 The outer shell 2 includes, for example, a cylindrical outer opening portion 4, a quadrangular pyramid-shaped shoulder portion 5 connected to the outer opening portion 4, a quadrangular tubular upper body portion 6 connected to the shoulder portion 5, and an upper body portion. 6 includes a cylindrical middle body portion 7 that is connected to 6, a lower cylindrical body portion 8 that is connected to the middle body portion 7, and a pyramidal bottom portion 9 that is connected to the lower body portion 8. 6, the middle body portion 7 and the lower body portion 8 form a body portion. The outer mouth portion 4 is provided with a male screw portion 10 and a support ring 11 on the outer peripheral surface thereof, and the bottom portion 9 is provided with a concave portion 12 which bulges inward of the outer bottle 2 and imparts self-supporting property to the multiple bottle 1.
凹部１２は、多角錐台状凹部が複数段積層された形状を備え、例えば、第１の多角錐台状凹部１２ａと、第１の多角錐台状凹部１２ａの内周側に積層されたより小さい第２の多角錐台状凹部１２ｂと、第２の多角錐台状凹部１２ｂの内周側に積層されたさらに小さい第３の多角錐台状凹部１２ｃとを備えている。 The recess 12 has a shape in which a plurality of polygonal truncated pyramidal recesses are stacked, and for example, is smaller than the first polygonal truncated pyramidal recess 12a and the inner peripheral side of the first polygonal truncated pyramid recess 12a. The second polygonal frustum-shaped recess 12b and the smaller third polygonal frustum-shaped recess 12c stacked on the inner peripheral side of the second polygonal frustum-shaped recess 12b are provided.
また、肩部５、上胴部６、下胴部８、底部９はそれぞれ四角形の頂点にＲが付されており、該頂点に稜線５ａ、６ａ、８ａ、９ａを備えている。ここで、稜線６ａは稜線５ａに連なり、稜線８ａは稜線９ａに連なっている。そして、稜線８ａは稜線６ａの延長上に連なっている。 Further, the shoulder portion 5, the upper body portion 6, the lower body portion 8, and the bottom portion 9 are each provided with an R at the apex of a quadrangle, and are provided with ridge lines 5a, 6a, 8a, 9a at the apex. Here, the ridge line 6a is connected to the ridge line 5a, and the ridge line 8a is connected to the ridge line 9a. The ridge line 8a is continuous with the extension of the ridge line 6a.
一方、内容器体３は、外口部４内周側に配設される円筒状内口部１３と、内口部１３に連接し、外郭ボトル２の肩部５、上胴部６、中胴部７、下胴部８、底部９、凹部１２の内面形状に沿う形状の内容器体本体１４とを備えている。内口部１３は、上部に外口部４の上端よりも上方に延出された延出部１５と、延出部１５から径方向外方に張り出す鍔部１６とを備えており、鍔部１６により外口部４の上端縁に係止されている。 On the other hand, the inner container body 3 is connected to the cylindrical inner mouth portion 13 arranged on the inner peripheral side of the outer mouth portion 4 and the inner mouth portion 13, and is connected to the shoulder portion 5, the upper body portion 6, and the middle portion of the outer bottle 2. The body portion 7, the lower body portion 8, the bottom portion 9, and the inner container body 14 having a shape along the inner surface shape of the concave portion 12 are provided. The inner mouth portion 13 is provided with an extension portion 15 extending upward from the upper end of the outer mouth portion 4 at the upper portion, and a flange portion 16 protruding radially outward from the extension portion 15, The portion 16 is engaged with the upper edge of the outer opening 4.
また、内口部１３は、外周面に溝１７を備えている。溝１７は鍔部１６の下面に形成された溝１８に連設されており、溝１８は鍔部１６の外周縁で外部に開放されている。この結果、溝１７及び溝１８により、外郭ボトル２と内容器体３との間に外気を導入する通気路１９が形成されている。 Further, the inner mouth portion 13 has a groove 17 on the outer peripheral surface. The groove 17 is connected to a groove 18 formed on the lower surface of the flange portion 16, and the groove 18 is open to the outside at the outer peripheral edge of the flange portion 16. As a result, the groove 17 and the groove 18 form a ventilation path 19 for introducing the outside air between the outer shell bottle 2 and the inner container body 3.
多重ボトル１は、例えば、図３に示す内プリフォーム２１を図４に示す外プリフォーム２２の内側に配置してブロー成形することにより製造することができる。 The multiple bottle 1 can be manufactured, for example, by arranging the inner preform 21 shown in FIG. 3 inside the outer preform 22 shown in FIG. 4 and blow molding.
内プリフォーム２１は、ポリエチレンテレフタレート等のポリエステル樹脂を材料として射出成形により形成され、内口部１３と、内口部１３の下方に連設され内口部１３よりも外径が小さい有底円筒状の内胴部２３とにより形成される。内口部１３は、内容器体３の内口部１３と同一形状であり、同一の構成には同一の符号を付して詳細な説明を省略する。内胴部２３の外径が内口部１３よりも小さいことにより、溝１７の下端は内口部１３と内胴部２３との境界で内胴部２３の外面に臨んで開放される。 The inner preform 21 is formed by injection molding using a polyester resin such as polyethylene terephthalate as a material, and is a bottomed cylinder having an inner diameter that is continuous with the inner opening portion 13 and is smaller than the inner opening portion 13. And the inner body portion 23 in the shape of a circle. The inner mouth portion 13 has the same shape as the inner mouth portion 13 of the inner container body 3, the same components are designated by the same reference numerals, and detailed description thereof will be omitted. Since the outer diameter of the inner body portion 23 is smaller than that of the inner mouth portion 13, the lower end of the groove 17 is opened to face the outer surface of the inner body portion 23 at the boundary between the inner mouth portion 13 and the inner body portion 23.
外プリフォーム２２は、ポリエチレンテレフタレート等のポリエステル樹脂を材料として射出成形により形成され、外口部４と、外口部４の下方に連設された有底円筒状の外胴部２４とにより形成される。外口部４は、外郭ボトル２の外口部４と同一形状であり、同一の構成には同一の符号を付して詳細な説明を省略する。 The outer preform 22 is formed by injection molding using a polyester resin such as polyethylene terephthalate as a material, and is formed by the outer opening portion 4 and a bottomed cylindrical outer body portion 24 that is continuously provided below the outer opening portion 4. To be done. The outer mouth portion 4 has the same shape as the outer mouth portion 4 of the outer bottle 2, and the same components are designated by the same reference numerals and detailed description thereof will be omitted.
図４に示すように、内プリフォーム２１の内口部１３は外プリフォーム２２の外口部４に挿着され、内プリフォーム２１の内胴部２３は外プリフォーム２２の外胴部２４の内部に配置される。このとき、延出部１５が外プリフォーム２２の外口部４の上方に延出し、鍔部１６が外プリフォーム２２の外口部４の上端面に当接して係止される。これにより、内プリフォーム２１の内口部１３は、外プリフォーム２２の外口部４の内側に確実に位置決めされる。 As shown in FIG. 4, the inner mouth portion 13 of the inner preform 21 is inserted into the outer mouth portion 4 of the outer preform 22, and the inner body portion 23 of the inner preform 21 is the outer body portion 24 of the outer preform 22. Placed inside. At this time, the extending portion 15 extends above the outer opening portion 4 of the outer preform 22, and the flange portion 16 abuts on and is locked by the upper end surface of the outer opening portion 4 of the outer preform 22. Accordingly, the inner opening portion 13 of the inner preform 21 is reliably positioned inside the outer opening portion 4 of the outer preform 22.
次に、図５Ａ〜図５Ｃを参照して、本実施形態の多重ボトル１のブロー成形について説明する。 Next, blow molding of the multiple bottle 1 of the present embodiment will be described with reference to FIGS. 5A to 5C.
本実施形態において使用するブロー成形装置は周知のものであり、図５Ａ〜図５Ｃにおいて要部を示すように、金型３１と、ブローノズル３２と、ストレッチロッド３３とを備えている。 The blow molding device used in the present embodiment is well known, and includes a mold 31, a blow nozzle 32, and a stretch rod 33, as shown in FIG. 5A to FIG. 5C.
金型３１は、外郭ボトル２の肩部５、上胴部６、中胴部７、下胴部８、底部９に沿う形状の成形部３４と、凹部１２に沿う形状の底部成形部３５と、外プリフォーム２２の外口部４のサポートリング１１の上方を露出させて支持する支持開口部３６とを備えている。金型３１は図示しない割型構造とされており、成形部３４の左右側と底部成形部３５側とで分割することによって成形後の多重ボトル１が脱型できるようになっている。 The mold 31 includes a molding portion 34 having a shape along the shoulder portion 5, the upper body portion 6, the middle body portion 7, the lower body portion 8, and the bottom portion 9 of the outer bottle 2, and a bottom portion molding portion 35 having a shape along the recess 12. And a support opening portion 36 that exposes and supports the upper side of the support ring 11 of the outer opening portion 4 of the outer preform 22. The mold 31 has a split mold structure (not shown), and by dividing the left and right sides of the molding portion 34 and the bottom molding portion 35 side, the molded multiple bottle 1 can be demolded.
ブローノズル３２は、図示しない昇降手段により昇降され、Ｏリング３７を介して内プリフォーム２１の鍔部１６の上端面に気密に当接する。ブローノズル３２にはストレッチロッド３３が挿通され、ストレッチロッド３３の外周面とブローノズル３２の内周面との間には、図示しない高圧気体供給手段に接続された気体通路３８が形成されている。 The blow nozzle 32 is raised and lowered by a not-shown raising and lowering means, and airtightly contacts the upper end surface of the flange portion 16 of the inner preform 21 via the O-ring 37. A stretch rod 33 is inserted into the blow nozzle 32, and a gas passage 38 connected to a high pressure gas supply means (not shown) is formed between the outer peripheral surface of the stretch rod 33 and the inner peripheral surface of the blow nozzle 32. ..
ストレッチロッド３３は、図示しない進退駆動手段によってブロー成形時に前進される。尚、図５Ａにおいては、ストレッチロッド３３がブローノズル３２の先端から突出しているが、ストレッチロッド３３は未使用時には後退されてブローノズル３２の内方（図中上方）に収納されている。 The stretch rod 33 is advanced during blow molding by an unillustrated advancing/retreating drive means. In FIG. 5A, the stretch rod 33 projects from the tip of the blow nozzle 32, but the stretch rod 33 is retracted when not in use and is housed inside the blow nozzle 32 (upper side in the figure).
上述の構成のブロー成形装置によって、多重ボトル１を製造するときには、図５Ａに示すように、内プリフォーム２１を外プリフォーム２２に挿着し、外プリフォーム２２を金型３１にセットした後、内プリフォーム２１の内口部１３にブローノズル３２を接続する。尚、内プリフォーム２１及び外プリフォーム２２は、金型３１にセットされるに先立ってブロー成形可能な温度に加熱される。 When the multiple bottle 1 is manufactured by the blow molding apparatus having the above-described configuration, after the inner preform 21 is inserted into the outer preform 22 and the outer preform 22 is set in the mold 31, as shown in FIG. 5A. The blow nozzle 32 is connected to the inner opening portion 13 of the inner preform 21. The inner preform 21 and the outer preform 22 are heated to a temperature at which they can be blow-molded before being set in the mold 31.
次いで、図５Ｂに示すようにブローノズル３２の気体通路３８から内プリフォーム２１内に加圧空気を導入し、同時にストレッチロッド３３を下方に伸長させる。これにより、内プリフォーム２１が膨張して未膨張状態の外プリフォーム２２の内面に密着する。 Next, as shown in FIG. 5B, pressurized air is introduced into the inner preform 21 from the gas passage 38 of the blow nozzle 32, and at the same time, the stretch rod 33 is extended downward. As a result, the inner preform 21 expands and comes into close contact with the inner surface of the unexpanded outer preform 22.
続いて、図５Ｂに示す状態から、更に内プリフォーム２１内に加圧空気を導入しつつ、ストレッチロッド３３を下方に伸長させると、膨張した内プリフォーム２１の内胴部２３により外プリフォーム２２の外胴部２４が広げられ、図５Ｃに示すように、金型３１の成形部３４により外郭ボトル２の肩部５、上胴部６、中胴部７、下胴部８、底部９の形状に成形され、底部成形部３５により凹部１２の形状に成形される。また、内プリフォーム２１の内胴部２３は、外郭ボトル２の肩部５、上胴部６、中胴部７、下胴部８、底部９、凹部１２の内面形状に沿う形状に成形される。この結果、図１及び図２に示す多重ボトル１が得られる。 Subsequently, from the state shown in FIG. 5B, when the stretch rod 33 is extended downward while further introducing pressurized air into the inner preform 21, the outer preform is expanded by the inner trunk portion 23 of the expanded inner preform 21. As shown in FIG. 5C, the outer body 24 of the outer bottle 22 is expanded, and the shoulder portion 5, the upper body portion 6, the middle body portion 7, the lower body portion 8, and the bottom portion 9 of the outer bottle 2 are formed by the molding portion 34 of the mold 31. And the bottom molding portion 35 is molded into the shape of the recess 12. In addition, the inner body portion 23 of the inner preform 21 is formed into a shape that follows the inner surface shape of the shoulder portion 5, the upper body portion 6, the middle body portion 7, the lower body portion 8, the bottom portion 9, and the recess 12 of the outer shell bottle 2. It As a result, the multiple bottle 1 shown in FIGS. 1 and 2 is obtained.
多重ボトル１では、前記ブロー成形により凹部１２が形成される際に、内プリフォーム２１が外プリフォーム２２に熱圧着されることにより、内容器体本体１４が外郭ボトル２に密着される。 In the multiple bottle 1, the inner preform 21 is thermocompression-bonded to the outer preform 22 when the recess 12 is formed by the blow molding, so that the inner container body 14 is brought into close contact with the outer bottle 2.
次に、図６、図７Ａ及び図７Ｂを参照して、本実施形態の多重ボトル１の使用状態及び作用効果について、説明する。 Next, with reference to FIG. 6, FIG. 7A, and FIG. 7B, the usage state and operational effects of the multiplex bottle 1 of this embodiment will be described.
本実施形態の多重ボトル１は、内容器体３に図示しない内容物が収容されており、該内容物を注出するときには、図６に示すように、外口部４及び内口部１３を下方に向けて傾ける。そして、外郭ボトル２の中胴部７を押圧すると、内容器体本体１４が減容変形することにより、前記内容物が注出される。多重ボトル１では、中胴部７が円筒状であるので、周方向のどの部分を押圧してもよく、内容器体本体１４を減容変形させることができる。 In the multiplex bottle 1 of the present embodiment, the contents (not shown) are contained in the inner container body 3, and when the contents are poured out, as shown in FIG. Tilt downwards. Then, when the middle body portion 7 of the outer shell bottle 2 is pressed, the inner container body 14 is deformed and reduced in volume, so that the contents are poured out. In the multiple bottle 1, since the middle body portion 7 has a cylindrical shape, any portion in the circumferential direction may be pressed, and the inner container body 14 can be deformed and reduced in volume.
次に、外郭ボトル２の中胴部７の押圧を解除すると、外郭ボトル２と内容器体本体１４との間に通気路１９から外気が導入され、外気圧により外郭ボトル２は原形に復帰するが内容器体本体１４は減容変形したままの状態が維持される。 Next, when the pressing of the middle body portion 7 of the outer bottle 2 is released, outside air is introduced from the ventilation passage 19 between the outer bottle 2 and the inner container body 14, and the outer bottle 2 returns to its original shape by the external pressure. However, the inner container body 14 is maintained in a state where the volume is reduced and deformed.
このとき、前記内容物は重力により内口部１３方向に集中しているので、内容器体本体１４は外郭ボトル２の下胴部８に対応する部分から、内容器体本体１４の稜線８ａ，８ａに挟まれる部分に対応する側面部分１４ａの中心部に谷折れ部１４ｂが形成されて内側に没入することにより、谷折れ変形が始まる。 At this time, since the contents are concentrated in the direction of the inner mouth portion 13 due to gravity, the inner container body 14 is moved from the portion corresponding to the lower body portion 8 of the outer bottle 2 to the ridge line 8a of the inner container body 14, A valley fold 14b is formed at the center of the side surface portion 14a corresponding to the portion sandwiched by 8a, and the valley fold deformation is started by immersing the valley fold 14b inward.
本実施形態の多重ボトル１は、外郭ボトル２の下胴部８が四角筒状となっており、内容器体本体１４は外郭ボトル２の内部形状に沿う形状を備えている。そこで、前記谷折れ変形は、内容器体本体１４の稜線８ａに対応する部分がリブとして作用し、稜線８ａ，８ａに挟まれる部分に対応する側面部分１４ａより強度が大きくなるため、図７Ａに仮想線示するように、より強度の小さい側面部分１４ａの中心部に谷折れ部１４ｂが形成されることにより始まると考えられる。 In the multiplex bottle 1 of the present embodiment, the lower body portion 8 of the outer shell 2 has a rectangular tubular shape, and the inner container body 14 has a shape that follows the inner shape of the outer bottle 2. Therefore, the valley-folding deformation is such that the portion corresponding to the ridgeline 8a of the inner container body 14 acts as a rib, and the strength is larger than that of the side face portion 14a corresponding to the portion sandwiched between the ridgelines 8a and 8a. As indicated by a virtual line, it is considered to start when a valley fold 14b is formed at the center of the side surface portion 14a having a smaller strength.
多重ボトル１では、外郭ボトル２の中胴部７の押圧と該押圧の解除とを繰り返すことにより次第に前記内容物が減少する。前記内容物が減少すると、内容器体本体１４の谷折れ変形が、外郭ボトル２の下胴部８に対応する部分を起点として、幅方向では内容器体本体１４の外側から内方に向けて進行し、図７Ａに示すように隣接する側面部分１４ａ，１４ａが接して、断面視十字状に変形する。 In the multiplex bottle 1, the contents are gradually reduced by repeatedly pressing and releasing the middle body portion 7 of the outer shell bottle 2. When the content is reduced, the valley deformation of the inner container body 14 starts from the portion corresponding to the lower body portion 8 of the outer bottle 2 in the width direction from the outer side to the inner side of the inner container body 14. As it proceeds, the adjacent side surface portions 14a, 14a are in contact with each other as shown in FIG.
また、内容器体本体１４の谷折れ変形は、外郭ボトル２の下胴部８に対応する部分を起点として、長さ方向では内口部１３に向けて進行する。尚、このとき、内容器体本体１４の谷折れ変形した部分は、図７Ａに示すように、谷折れ変形の進行に伴って外郭ボトル２の内面から離間する。 Further, the valley bending deformation of the inner container body 14 proceeds from the portion corresponding to the lower body portion 8 of the outer shell 2 toward the inner mouth portion 13 in the length direction. At this time, the valley-folded portion of the inner container body 14 separates from the inner surface of the outer bottle 2 as the valley-folded deformation progresses, as shown in FIG. 7A.
前記内容物がさらに減少すると、内容器体本体１４の谷折れ変形は、やがて外郭ボトル２の上胴部６から肩部５に対応する部分に至る。このとき、上胴部６の稜線６ａは下胴部８の稜線８ａの延長上にあり、肩部５の稜線５ａは上胴部６の稜線６ａに連なっている。従って、内容器体本体１４における谷折れ変形は、上胴部６の稜線６ａ，６ａ、肩部５の稜線５ａ，５ａに挟まれる部分に対応する側面部分１４ａに向けて進行することになる。 When the contents are further reduced, the valley bending deformation of the inner container body 14 eventually reaches from the upper body portion 6 of the outer shell 2 to the portion corresponding to the shoulder portion 5. At this time, the ridge line 6a of the upper body portion 6 is an extension of the ridge line 8a of the lower body portion 8, and the ridge line 5a of the shoulder portion 5 is continuous with the ridge line 6a of the upper body portion 6. Therefore, the valley fold deformation in the inner container body 14 progresses toward the side surface portion 14a corresponding to the portion between the ridge lines 6a, 6a of the upper body portion 6 and the ridge lines 5a, 5a of the shoulder portion 5.
更にこのとき、内容器体本体１４の上胴部６の稜線６ａ及び、肩部５の稜線５ａに対応する部分は、下胴部８の稜線８ａに対応する部分と同様にリブとして作用するので、稜線５ａ，５ａ及び、稜線６ａ，６ａに挟まれる部分に対応する側面部分１４ａより強度が大きくなる。従って、図７Ｂに示すように、稜線５ａ，５ａ及び、稜線６ａ，６ａに挟まれる部分に対応する側面部分１４ａは、前記谷折れ変形に連なる形で容易に谷折れし、隣接する側面部分１４ａ，１４ａが接して、断面視十字状に変形する。 Further, at this time, the ridge line 6a of the upper body portion 6 of the inner container body 14 and the portion corresponding to the ridge line 5a of the shoulder portion 5 act as ribs similarly to the portion corresponding to the ridge line 8a of the lower body portion 8. , Ridge lines 5a, 5a and side portions 14a corresponding to the portions sandwiched by the ridge lines 6a, 6a are stronger. Therefore, as shown in FIG. 7B, the ridge lines 5a, 5a and the side face portions 14a corresponding to the portions sandwiched by the ridge lines 6a, 6a easily fold in a valley in a manner continuous with the valley fold deformation, and the adjacent side face portions 14a. , 14a come into contact with each other and are deformed in a cross shape in cross section.
この結果、前記谷折れ変形は、内容器体本体１４の全体で、幅方向では内容器体本体１４の外側から内方に向けて、長さ方向では外郭ボトル２の下胴部８に対応する部分から内口部１３に向けて進行することになり、図６に示すよう、外郭ボトル２の長さ方向に沿って谷折れ部１４ｂが形成される。 As a result, the valley fold deformation corresponds to the entire lower portion 8 of the inner container body 14 in the width direction from the outer side to the inner side of the inner container body 14 and in the length direction to the outer body 2 of the outer bottle 2. As it progresses from the portion toward the inner mouth portion 13, as shown in FIG. 6, a valley fold portion 14b is formed along the length direction of the outer bottle 2.
上述のように谷折れ部１４ｂが形成される際に、多重ボトル１では、凹部１２が多角錐台状凹部１２ａ，１２ｂ，１２ｃからなる形状を備えているので、ブロー成形時の加熱圧着により、内容器体本体１４が外郭ボトル２に密着している。また、凹部１２が多角錐台状凹部１２ａ，１２ｂ，１２ｃからなり、多数の段差部と屈曲部とを備えていることにより、凹部１２においては外郭ボトル２と内容器体本体１４の間に外気が侵入することがない。 When the valley folds 14b are formed as described above, in the multiple bottle 1, since the recess 12 has the shape of the polygonal truncated pyramidal recesses 12a, 12b, and 12c, by thermocompression bonding during blow molding, The inner container body 14 is in close contact with the outer bottle 2. Further, since the concave portion 12 is composed of the polygonal truncated pyramidal concave portions 12a, 12b, 12c and is provided with a large number of step portions and bent portions, in the concave portion 12, outside air is provided between the outer bottle 2 and the inner container body 14. Never intrudes.
さらに、谷折れ部１４ｂが形成される際に、内容器体本体１４は、多角錐台状凹部１２ａから径方向外側に連なる領域が多角錐台状凹部１２ａの直線状の底辺に沿って折れ、径方向内側に倒れ込む形で外郭ボトル２の内面から離間する性状を備えている。そこで、凹部１２においては、前記谷折れ変形が開始された後にも、内容器体本体１４の外郭ボトル２に対する密着性が維持される。 Further, when the valley folds 14b are formed, in the inner container body 14, the region that is continuous from the polygonal frustum-shaped recess 12a to the outside in the radial direction is folded along the linear bottom of the polygonal frustum-shaped recess 12a, It has a property of falling apart from the inner surface of the outer bottle 2 so as to fall inward in the radial direction. Therefore, in the concave portion 12, the adhesion of the inner container body 14 to the outer bottle 2 is maintained even after the valley bending deformation is started.
従って、外郭ボトル２の長さ方向に沿って谷折れ部１４ｂが形成される間に、底部９において外郭ボトル２から内容器体本体１４が剥離することがなく、内容器体本体１４に収容されている内容物を余すことなく注出することができ、残液を減少させることができる。 Therefore, the inner container body 14 is not separated from the outer bottle 2 at the bottom portion 9 while the valley folds 14b are formed along the length direction of the outer bottle 2, and the inner container body 14 is housed in the inner container body 14. The remaining contents can be poured out completely, and the residual liquid can be reduced.
尚、本実施形態では、凹部１２が多角錐台状凹部１２ａ，１２ｂ，１２ｃからなる３段構成となっているが、凹部１２は少なくとも最下段の凹部１２ａが多角錐台状であればよく、他の段は多角錐台状であってもよく、円錐台状であってもよい。また、凹部１２は、多角錐台状凹部を複数段備えていればよく、前記３段構成には限定されない。 In addition, in the present embodiment, the recess 12 has a three-stage configuration including the polygonal truncated pyramidal recesses 12a, 12b, and 12c, but the recess 12 may have at least the lowest recess 12a in the shape of a polygonal truncated pyramid. The other steps may have a truncated pyramid shape or a truncated cone shape. Further, the recessed portion 12 is not limited to the above three-stage configuration as long as the recessed portion 12 has a plurality of stages of polygonal truncated pyramidal recesses.
また、本実施形態では、外郭ボトル２の肩部５、底部９を四角錐状としているが、肩部５、底部９は三角錐状、五角錐状、六角錐状のいずれか１つの多角錐状であってもよい。また、本実施形態では、外郭ボトル２の上胴部６、下胴部８を四角筒状としているが、上胴部６、下胴部８は、三角筒状、五角筒状、六角筒状のいずれか１つの多角筒状であってもよい。 Further, in the present embodiment, the shoulder portion 5 and the bottom portion 9 of the outer bottle 2 are formed in a quadrangular pyramid shape, but the shoulder portion 5 and the bottom portion 9 are any one of a triangular pyramid shape, a pentagonal pyramid shape, and a hexagonal pyramid shape. It may be a shape. In addition, in the present embodiment, the upper body portion 6 and the lower body portion 8 of the outer shell 2 are formed in a square tubular shape, but the upper body portion 6 and the lower body portion 8 are formed in a triangular tubular shape, a pentagonal tubular shape, and a hexagonal tubular shape. Any one of the above may have a polygonal tubular shape.
また、前記多角錐状又は多角筒状は、多角形の頂点がカットされ、或いは多角形の頂点にＲが付されていてもよい。さらに、前記頂点に挟まれた辺を外方に膨出させてもよく、膨出させた辺に１以上の頂点を備えていてもよい。 Further, in the polygonal pyramid or the polygonal cylinder, the polygonal vertices may be cut, or R may be attached to the polygonal vertices. Further, the sides sandwiched by the vertices may be bulged outward, and the bulged sides may be provided with one or more vertices.
さらに、多重ボトル１は、外郭ボトル２が外圧に対して原形復帰可能であり、内容器体３が外圧により変形するものであればよく、外郭ボトル２の肩部５、上胴部６、中胴部７、下胴部８、底部９の形状は、上述の形状に限定されず、どのような形状であってもよい。 Further, the multiple bottle 1 may be any one as long as the outer bottle 2 can return to its original shape with respect to the outer pressure and the inner container body 3 is deformed by the outer pressure, and the shoulder portion 5, the upper body portion 6, and the middle portion of the outer bottle 2 The shapes of the body portion 7, the lower body portion 8, and the bottom portion 9 are not limited to the above-mentioned shapes, and may be any shape.
また、本実施形態では、外口部４の外周面に雄ねじ部１０を備える構成としているが、外口部４は雄ねじ部１０を備えない単なる円筒状であってもよく、このようにすることにより例えば醤油ボトル等の打栓式口部等に適用することができる。 Further, in the present embodiment, the external thread portion 10 is provided with the external thread portion 10 on the outer peripheral surface thereof, but the external opening portion 4 may have a simple cylindrical shape without the external thread portion 10. Thus, for example, it can be applied to a stopper type mouth part such as a soy sauce bottle.
１…合成樹脂製多重ボトル、 ２…外郭ボトル、 ３…内容器体、 ４…円筒状外口部、 ５…肩部、 ６…上胴部、 ７…中胴部、８…下胴部、 ９…底部、１０…雄ねじ部、 １２…凹部、 １３…円筒状内口部、 １４…内容器体本体、 １９…通気路。 DESCRIPTION OF SYMBOLS 1... Synthetic resin multiple bottles, 2... Outer shell, 3... Inner container body, 4... Cylindrical outer opening part, 5... Shoulder part, 6... Upper body part, 7... Middle body part, 8... Lower body part, 9... Bottom part, 10... Male screw part, 12... Recessed part, 13... Cylindrical inner mouth part, 14... Inner container body, 19... Ventilation path.
Claims (2)
該外郭ボトルの該円筒状外口部の内周側に配設される円筒状内口部と、該内口部に連接し該外郭ボトルの内面形状に沿う形状の内容器体本体とを備え、外圧により変形する内容器体と、
該外口部と該内口部との間に形成されて該外郭ボトルと該内容器体との間に外気を導入する通気路とを備えるポリエステル樹脂製ブロー成形多重ボトルにおいて、
前記凹部は、錐台状凹部が複数段積層された形状を備え、少なくとも該錐台状凹部の最下段が多角錐台状であることを特徴とするポリエステル樹脂製ブロー成形多重ボトル。 A cylindrical outer mouth portion, a shoulder portion connected to the outer mouth portion, a body portion connected to the shoulder portion, and a bottom portion having a recess portion that is connected to the body portion and bulges into the bottle on the inner peripheral side. Equipped with an outer bottle that can return to its original shape against external pressure,
A cylindrical inner mouth portion disposed on the inner peripheral side of the cylindrical outer mouth portion of the outer bottle, and an inner container body having a shape that is connected to the inner mouth portion and follows the inner surface shape of the outer bottle. , An inner container body that is deformed by external pressure,
In a blow molding multiplex bottle made of polyester resin, which is formed between the outer opening portion and the inner opening portion and has a ventilation path for introducing outside air between the outer shell bottle and the inner container body,
The blow molding multi-layer bottle made of polyester resin, wherein the recess has a shape in which a plurality of frustum-shaped recesses are stacked, and at least the lowest step of the frustum-shaped recess is a polygonal frustum.
前記凹部は、多角錐台状凹部が複数段積層された形状を備えることを特徴とするポリエステル樹脂製ブロー成形多重ボトル。 The polyester resin blow molded multiplex bottle according to claim 1,
The blow molding multi-layer bottle made of polyester resin, wherein the concave portion has a shape in which a plurality of truncated pyramidal concave portions are stacked.
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| JP2016056595A JP6730824B2 (en) | 2016-03-22 | 2016-03-22 | Polyester resin blow molding multiplex bottle |
| US16/086,973 US11840367B2 (en) | 2016-03-22 | 2017-03-22 | Synthetic resin multilayer bottle |
| TW106109840A TWI714742B (en) | 2016-03-22 | 2017-03-22 | Synthetic resin multilayer bottle |
| PCT/JP2017/011398 WO2017164225A1 (en) | 2016-03-22 | 2017-03-22 | Synthetic resin multilayer bottle |
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| US20200239174A1 (en) * | 2017-10-06 | 2020-07-30 | Hokkai Can Co., Ltd. | Synthetic resin multilayer bottle |
| JP7075763B2 (en) * | 2018-01-12 | 2022-05-26 | 北海製罐株式会社 | Manufacturing method of blow-molded multiple bottles made of synthetic resin |
| JP7199781B2 (en) * | 2018-03-30 | 2023-01-06 | 株式会社吉野工業所 | delaminating container |
| JP7258425B2 (en) * | 2019-03-28 | 2023-04-17 | 株式会社吉野工業所 | Preform assembly, double container and method for manufacturing double container |
| JP2020200086A (en) * | 2019-06-11 | 2020-12-17 | メビウスパッケージング株式会社 | Multiple container |
| JP7519844B2 (en) * | 2020-08-28 | 2024-07-22 | 株式会社吉野工業所 | Double container |
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| JPH06239332A (en) * | 1991-04-17 | 1994-08-30 | Keisuke Ito | Multi-layer container |
| JP3124620B2 (en) * | 1992-05-11 | 2001-01-15 | 株式会社吉野工業所 | Laminated bottle |
| JP3569075B2 (en) * | 1996-05-09 | 2004-09-22 | 株式会社吉野工業所 | Laminated blow container and method for forming air introduction hole in the container |
| JPH10338269A (en) * | 1997-06-05 | 1998-12-22 | Yoshino Kogyosho Co Ltd | Bottle body |
| NZ521694A (en) * | 2002-09-30 | 2005-05-27 | Co2 Pac Ltd | Container structure for removal of vacuum pressure |
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