JP2018016344A - Synthetic resin container, and manufacturing method for the same - Google Patents
Synthetic resin container, and manufacturing method for the same Download PDFInfo
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- JP2018016344A JP2018016344A JP2016147016A JP2016147016A JP2018016344A JP 2018016344 A JP2018016344 A JP 2018016344A JP 2016147016 A JP2016147016 A JP 2016147016A JP 2016147016 A JP2016147016 A JP 2016147016A JP 2018016344 A JP2018016344 A JP 2018016344A
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- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 31
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 230000000994 depressogenic effect Effects 0.000 claims abstract description 32
- 230000002093 peripheral effect Effects 0.000 claims abstract description 17
- 238000000465 moulding Methods 0.000 claims description 36
- 238000003780 insertion Methods 0.000 claims description 34
- 230000037431 insertion Effects 0.000 claims description 34
- 238000000071 blow moulding Methods 0.000 claims description 17
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 abstract description 4
- -1 polyethylene terephthalate Polymers 0.000 description 7
- 230000037303 wrinkles Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 101150061927 BMP2 gene Proteins 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 102100024506 Bone morphogenetic protein 2 Human genes 0.000 description 1
- 239000004278 EU approved seasoning Substances 0.000 description 1
- 101000762366 Homo sapiens Bone morphogenetic protein 2 Proteins 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 101100218949 Rattus norvegicus Bmp3 gene Proteins 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 235000011194 food seasoning agent Nutrition 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Stackable Containers (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
Abstract
Description
本発明は、スタッキング可能な合成樹脂製容器、及びその製造方法に関する。 The present invention relates to a stackable synthetic resin container and a method for manufacturing the same.
従来、ポリエチレンテレフタレートなどの熱可塑性樹脂を用いて有底筒状のプリフォームを形成し、次いで、このプリフォームを二軸延伸ブロー成形などによってボトル状に成形してなる合成樹脂製の容器が、各種飲料品、各種調味料等を内容物とする容器として広い分野で一般的に利用されている。 Conventionally, a synthetic resin container formed by forming a bottomed cylindrical preform using a thermoplastic resin such as polyethylene terephthalate, and then molding the preform into a bottle shape by biaxial stretch blow molding or the like, It is generally used in a wide field as a container containing various beverages and various seasonings.
そして、この種の合成樹脂製容器に関し、他の容器の口部側が挿入可能とされた陥没凹部を容器底部に設けて、二以上の容器を上下に積み重ねられるようにした、スタッキング可能（stackable）な容器が知られている（特許文献１参照）。 In addition, regarding this type of synthetic resin container, stackable parts (stackable) in which two or more containers can be stacked one above the other by providing a recessed part on the bottom of the container that can be inserted into the mouth of another container. A known container is known (see Patent Document 1).
しかしながら、このようなスタッキング可能な容器において、その容器底部に設けられた陥没凹部は、挿入された容器の口部側を覆い隠すことができる程度に、容器内方に大きく陥没した形状になっている。このため、ブロー成形に際しては、例えば、図１０に示すように、かかる陥没凹部を成形する底型ＢＭｐ１にプリフォームＰＦの延伸が妨げられてしまい、型内の容器底部の接地部を成形する部位ＣＧまでプリフォームＰＦが延伸されずに、接地部が成形できなくなってしまうという問題がある。このような問題は、底部全体の面積に対して、陥没凹部の占める割合が大きく、接地部の面積が小さい容器で特に顕著である。 However, in such a stackable container, the depressed recess provided in the bottom of the container has a shape greatly depressed inward of the container to the extent that it can cover the mouth side of the inserted container. Yes. Therefore, at the time of blow molding, for example, as shown in FIG. 10, the bottom mold BMp1 that molds the depressed recess is hindered from extending the preform PF, and the part that molds the ground contact portion of the container bottom in the mold There is a problem that the preform PF is not stretched to CG and the grounding portion cannot be formed. Such a problem is particularly conspicuous in a container in which the recessed portion occupies a large proportion and the area of the ground contact portion is small with respect to the entire area of the bottom.
また、このような問題を解決するには、例えば、図１１に示すように、陥没凹部を成形する底型ＢＭｐ２を可動式にすることが考えられる。すなわち、型内の底部の接地部を成形する部位ＣＧを越えて、下死点に位置する底型ＢＭｐ２に到達するまでプリフォームＰＦを延伸させてから、底型ＢＭｐ２を上死点まで上昇させて、当該部位ＣＧを越えて延伸された部分を押し戻しながら反転させることによって、陥没凹部が設けられた底部形状を賦形することが考えられる。 In order to solve such a problem, for example, as shown in FIG. 11, it is conceivable to make the bottom mold BMp <b> 2 that molds the depressed concave portion movable. That is, after extending the preform PF until reaching the bottom mold BMp2 located at the bottom dead center beyond the part CG forming the ground contact portion at the bottom of the mold, the bottom mold BMp2 is raised to the top dead center. Thus, it is conceivable to shape the bottom shape provided with the depressed recess by reversing the portion extended beyond the portion CG while pushing it back.
しかしながら、この場合には、型内の底部の接地部を成形する部位ＣＧを越えて延伸された部分が、これを反転させて陥没凹部を成形するための反転代として十分な長さとなるように、陥没凹部の深さに応じて、底型ＢＭｐ２のストロークＳ０を長くしなければならないが、そのためには、装置の大型化を招き、その形成は容易にできるものではない。 However, in this case, the portion extended beyond the portion CG for forming the ground contact portion at the bottom of the mold has a length sufficient as an inversion allowance for reversing it and forming the depressed recess. , depending on the depth of the depression recess, it is necessary to increase the stroke S 0 of the bottom type BMP2, for that purpose, leads to enlargement of the apparatus, its formation is not capable of easily.
そこで、本発明者らは、図１２に示すように、底型挿通部の径を拡げて、その内周面と底型ＭＢｐ３との間に、延伸されたプリフォームが入り込める空間を形成することで、底型ＢＭｐ３のストロークＳ１を長くせずとも、延伸されたプリフォームに十分な長さの反転代を確保できると考えて検討を試みた。
しかしながら、この場合には、延伸されたプリフォームの先端側はフリーな状態にあるため、プリフォームに僅かにでも偏肉があると、その影響で延伸に過不足が生じてしまう虞がある。そして、延伸が不足すると反転代が確保できずに賦形不良となり、延伸が過剰であると反転したときの肉余りによってバリが発生してしまうという問題がある。
Accordingly, as shown in FIG. 12, the present inventors expand the diameter of the bottom mold insertion portion, and form a space in which the stretched preform can enter between the inner peripheral surface and the bottom mold MBp3. Thus, an investigation was made on the assumption that a sufficiently long inversion allowance could be secured for the stretched preform without increasing the stroke S1 of the bottom BMp3.
However, in this case, since the leading end side of the stretched preform is in a free state, if there is a slight unevenness in the preform, there is a risk that the stretch may be excessive or insufficient. If the stretching is insufficient, the reversal allowance cannot be ensured, resulting in poor shaping, and if the stretching is excessive, there is a problem that burrs are generated due to the surplus when reversing.
本発明は、上記したような事情に鑑みてなされたものであり、他の容器の口部側が挿入可能とされた陥没凹部を容器底部に設けて、二以上の容器を上下に積み重ねられるようにした合成樹脂製容器において、陥没凹部が設けられた底部形状が賦形性良く良好に成形されたスタッキング可能な合成樹脂製容器、及びその製造方法の提供を目的とする。 The present invention has been made in view of the circumstances as described above, and is provided with a recessed recess that can be inserted on the mouth side of another container at the bottom of the container so that two or more containers can be stacked vertically. It is an object of the present invention to provide a stackable synthetic resin container in which a bottom shape provided with a depressed recess is formed with good shapeability and a manufacturing method thereof.
本発明に係る合成樹脂製容器は、口部、肩部、胴部、及び底部を備え、前記底部に、他の容器の口部側が挿入可能とされた陥没凹部が設けられて、二以上の容器を上下に積み重ねられるようにした合成樹脂製容器であって、前記陥没凹部が、前記底部の接地部の内周縁に沿って立ち上る基部と、前記基部に対して同心状に縮径して、前記他の容器の口部に装着された蓋体が遊嵌状に嵌入する蓋体嵌入部とを有し、前記基部と前記蓋体嵌入部とが段部を介して連接されている構成としてある。 The synthetic resin container according to the present invention includes a mouth, a shoulder, a trunk, and a bottom, and the bottom is provided with a depressed recess that allows insertion of the mouth of the other container. A container made of a synthetic resin that can be stacked up and down, wherein the depressed recess is reduced in diameter concentrically with respect to the base that rises along the inner periphery of the grounding portion of the bottom, As a configuration in which the lid mounted on the mouth of the other container has a lid insertion portion that fits in a loose fit, and the base and the lid insertion portion are connected via a stepped portion. is there.
また、本発明に係る合成樹脂製容器の製造方法は、上記した合成樹脂製容器の製造方法であって、前記陥没凹部に対応する形状の底型が、型内の前記接地部を成形する部位の内周縁に沿って穿設された底型挿通部に昇降可能に挿通されたブロー成形型を用い、前記底型を下死点に待機させた状態でブロー成形を開始し、次いで、前記底型を上死点まで上昇させてブロー成形を完了する方法としてある。 The synthetic resin container manufacturing method according to the present invention is the above-described synthetic resin container manufacturing method, wherein the bottom mold having a shape corresponding to the depressed recess forms the grounding portion in the mold. Blow molding is inserted into the bottom mold insertion part drilled along the inner peripheral edge of the mold so as to be able to move up and down, and blow molding is started with the bottom mold waiting at the bottom dead center. This is a method of raising the mold to the top dead center and completing blow molding.
本発明に係る合成樹脂製容器によれば、他の容器の口部側が挿入可能とされた陥没凹部が設けられた底部形状が賦形性良く良好に成形されたスタッキング可能な合成樹脂製容器を提供することができる。 According to the synthetic resin container according to the present invention, the stackable synthetic resin container in which the bottom shape provided with the recessed concave portion in which the mouth side of the other container can be inserted is formed with good shapeability is provided. Can be provided.
また、本発明に係る合成樹脂製容器の製造方法によれば、底型のストロークを長くせずとも、十分な長さの反転代を確保することが可能となり、さらに、延伸されたプリフォームの先端側が、底型の段部成形部によって規制されるため、反転代となる部分の延伸に過不足が生じないようにすることが可能であり、合成樹脂製容器の陥没凹部が設けられた底部の形状を賦形性よく良好に成形することができる。 In addition, according to the method for manufacturing a synthetic resin container according to the present invention, it is possible to secure a sufficient length inversion allowance without increasing the bottom mold stroke, and further, Since the tip side is regulated by the bottom mold step part, it is possible to prevent excess or deficiency in the extension of the part that becomes the reversal allowance, and the bottom part provided with the recessed part of the synthetic resin container This shape can be molded well with good formability.
以下、本発明の好ましい実施形態について、図面を参照しつつ説明する。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
本発明に係る容器１は、口部２、肩部３、胴部４、及び底部５を備えており、本発明の一実施形態として図示する容器１は、胴部４が円筒状に形成された、一般に、丸形ボトルと称される容器形状を有している。 A container 1 according to the present invention includes a mouth part 2, a shoulder part 3, a trunk part 4, and a bottom part 5. In the container 1 illustrated as an embodiment of the present invention, the trunk part 4 is formed in a cylindrical shape. In general, it has a container shape called a round bottle.
このような容器１は、熱可塑性樹脂を使用して射出成形や圧縮成形などにより有底筒状のプリフォームを成形し、このプリフォームを二軸延伸ブロー成形などにより所定の容器形状に成形することによって製造される。 Such a container 1 uses a thermoplastic resin to form a bottomed cylindrical preform by injection molding, compression molding, or the like, and the preform is molded into a predetermined container shape by biaxial stretch blow molding or the like. Manufactured by.
容器１を製造するにあたり、使用する熱可塑性樹脂としては、ブロー成形が可能な任意の樹脂を使用することができる。具体的には、ポリエチレンテレフタレート，ポリブチレンテレフタレート，ポリエチレンナフタレート，非晶ポリアリレート，ポリ乳酸又はこれらの共重合体などの熱可塑性ポリエステル，これらの樹脂あるいは他の樹脂とブレンドされたものなどが好適である。特に、ポリエチレンテレフタレートなどのエチレンテレフタレート系熱可塑性ポリエステルが、好適に使用される。また、ポリカーボネート，アクリロニトリル樹脂，ポリプロピレン，プロピレン−エチレン共重合体，ポリエチレンなども使用することができる。 In producing the container 1, as the thermoplastic resin to be used, any resin capable of blow molding can be used. Specifically, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, amorphous polyarylate, thermoplastic polyester such as polylactic acid or copolymers thereof, those blended with these resins or other resins, etc. are suitable. It is. In particular, an ethylene terephthalate thermoplastic polyester such as polyethylene terephthalate is preferably used. Also, polycarbonate, acrylonitrile resin, polypropylene, propylene-ethylene copolymer, polyethylene and the like can be used.
口部２は、内容物の取り出し口となる円筒状の部位であり、かかる口部２には、容器内を密封する蓋体６が取り付けられる。
なお、図１では、蓋体６の一部を切り欠いて示している。
The mouth portion 2 is a cylindrical portion serving as a content outlet, and a lid body 6 that seals the inside of the container is attached to the mouth portion 2.
In FIG. 1, a part of the lid 6 is cut away.
また、口部２の下端は、胴部４に向かって拡径して口部２と胴部４との間をつなぐ肩部３に連接しており、図示する例において、肩部３は円錐台状に形成されている。 Further, the lower end of the mouth portion 2 expands toward the body portion 4 and is connected to the shoulder portion 3 connecting the mouth portion 2 and the body portion 4. In the illustrated example, the shoulder portion 3 has a conical shape. It is formed in a trapezoid shape.
胴部４は、容器１の高さ方向の大半を占める部位であり、上端が肩部３に連接し、下端が底部５に連接している。特に図示しないが、胴部４には、いわゆるホットパックにより内容物を充填、密封した後に、常温に冷却された容器内の圧力減少分を吸収する減圧吸収パネルや、横方向の耐荷重強度を高めるための環状の横溝などを、必要に応じて設けることができる。 The body 4 is a part that occupies most of the height direction of the container 1, and has an upper end connected to the shoulder 3 and a lower end connected to the bottom 5. Although not particularly shown, the body 4 is filled with a so-called hot pack and sealed, and then has a reduced pressure absorption panel that absorbs the pressure decrease in the container cooled to room temperature, and has a lateral load resistance strength. An annular transverse groove or the like for raising can be provided as necessary.
ここで、高さ方向とは、口部２を上にして容器１を水平面に正立させたときに、水平面に直交する方向をいうものとし、この状態で容器１の上下左右及び縦横の方向を規定するものとする。また、容器１を成形するブロー成形型１００についても同様とし、成形される容器１に対応させて、その方向を規定するものとする。 Here, the height direction means a direction orthogonal to the horizontal plane when the container 1 is erected on the horizontal plane with the mouth portion 2 up, and in this state, the vertical, horizontal, vertical and horizontal directions of the container 1 are defined. Shall be defined. The same applies to the blow mold 100 for molding the container 1, and the direction thereof is defined in accordance with the container 1 to be molded.
また、底部５は、容器１を水平面に正立させたときに、当該水平面に接触して、容器１を自立可能とするための接地部５０を有しており、底部５の側面は、接地部５０の外周縁に沿って斜め上方に湾曲しながら胴部４の下端に連接している。図示する例において、接地部５０は、周方向に沿って環状に延在するように形成されているが、容器１が自立可能であれば、その具体的な形状は限定されない。 Further, the bottom 5 has a grounding portion 50 for allowing the container 1 to stand by itself in contact with the horizontal plane when the container 1 is set upright on the horizontal plane. It is connected to the lower end of the body part 4 while being bent obliquely upward along the outer peripheral edge of the part 50. In the illustrated example, the grounding portion 50 is formed so as to extend annularly along the circumferential direction, but the specific shape is not limited as long as the container 1 can stand on its own.
また、底部５には、その中央部を容器内方に陥没させて、他の容器１の口部２側が挿入可能とされた陥没凹部５１が設けられている。このような陥没凹部５１を設けることで、容器１は、図１に示すように、二以上の容器１を上下に積み重ねられるようになっている。 Further, the bottom portion 5 is provided with a depressed concave portion 51 whose center portion is depressed inward of the container so that the mouth portion 2 side of the other container 1 can be inserted. By providing such a depressed recess 51, the container 1 is configured such that two or more containers 1 are stacked one above the other as shown in FIG.
陥没凹部５１は、接地部５０の内周縁に沿って立ち上る基部５２と、かかる基部５２に対して同心状に縮径して、他の容器１の口部２に装着された蓋体６が遊嵌状に嵌入する蓋体嵌入部５３とを有し、基部５２と蓋体嵌入部５３とが段部５４を介して連接されている。 The depressed recess 51 has a base 52 that rises along the inner peripheral edge of the ground contact portion 50, and a diameter that is concentrically reduced with respect to the base 52, so that the lid 6 attached to the mouth 2 of the other container 1 is free to play. It has the cover body insertion part 53 inserted in fitting shape, and the base 52 and the cover body insertion part 53 are connected via the step part 54. As shown in FIG.
本実施形態において、蓋体嵌入部５３は、容器１の軸心と同軸に形成され、二以上の容器１を同軸上に積み重ねられるようにしてあり、肩部３には、上方に積み重ねられた容器１の陥没凹部５１の開口部周縁に係合する環状係合部３０を設けておくのが好ましい。このようにすることで、容器１をより安定した状態で積み重ねることができる。 In the present embodiment, the lid insertion portion 53 is formed coaxially with the axis of the container 1 so that two or more containers 1 can be stacked on the same axis, and the shoulder 3 is stacked upward. It is preferable to provide an annular engagement portion 30 that engages with the periphery of the opening of the recessed recess 51 of the container 1. By doing in this way, the containers 1 can be stacked in a more stable state.
このような容器１は、容器内方に大きく陥没する陥没凹部５１が設けられた底部５の形状が賦形性よく成形されるように、陥没凹部５１を成形する底型ＢＭを可動式としたブロー成形型１００を用いて製造することができる（図２参照）。 In such a container 1, the bottom mold BM for molding the depressed recess 51 is made movable so that the shape of the bottom 5 provided with the depressed recess 51 that is greatly depressed inward of the container is formed with good shapeability. It can be manufactured using a blow mold 100 (see FIG. 2).
ブロー成形型１００は、その型内の底部５の接地部５０を成形する部位ＣＧの内周縁に沿って鉛直方向に穿設された底型挿通部に、底型ＢＭが挿通された構成とされている。そして、底型ＢＭは、かかる底型挿通部の内周面１０１を摺動する摺動部ＢＭ０を有しており、図示しない駆動装置によって底型挿通部内を鉛直方向に昇降可能とされている。
また、底型ＢＭは、陥没凹部５１に対応する形状とされ、上記摺動部ＢＭ０とともに、蓋体嵌入部５３を成形する蓋体嵌入部成形部ＢＭ５３と、段部５４を成形する段部成形部ＢＭ５４と、基部５２を成形する基部成形部ＢＭ５２とを有している。
The blow molding die 100 is configured such that a bottom die BM is inserted into a bottom die insertion portion that is drilled in a vertical direction along an inner peripheral edge of a portion CG for molding the grounding portion 50 of the bottom 5 in the die. ing. The bottom mold BM has a sliding part BM0 that slides on the inner peripheral surface 101 of the bottom mold insertion part, and can be moved up and down in the vertical direction by a driving device (not shown). .
Further, the bottom mold BM has a shape corresponding to the recessed recess 51, and together with the sliding part BM0, a lid insertion part molding part BM53 for molding the lid insertion part 53 and a step part molding for molding the step part 54. A part BM54 and a base forming part BM52 for forming the base 52 are provided.
容器１を製造するには、まず、図２に示すように、加熱、軟化させてブロー成形が可能な状態とされたプリフォームＰＦをセットするとともに、底型ＢＭを下死点で待機させた状態で、ブロー成形型１００を型閉じする。そして、図示しない延伸ロッドを下動させつつ、プリフォームＰＦの内部にブローエアーを吹き込んでブロー成形を開始する。 In order to manufacture the container 1, first, as shown in FIG. 2, a preform PF that is heated and softened to be capable of blow molding is set, and the bottom mold BM is kept at the bottom dead center. In the state, the blow mold 100 is closed. Then, blow air is started by blowing blow air into the preform PF while lowering a drawing rod (not shown).
このとき、延伸ロッドの下動速度やブローエアーの圧力などを適宜調整することで、プリフォームＰＦを均一に延伸することができ、型内の底部５の接地部５０を成形する部位ＣＧを越えて、下死点に位置する底型ＢＭに到達するまでプリフォームＰＦを延伸させて、成形中間体ＭＭとする(図４参照)。次いで、底型ＢＭを上死点まで上昇させて、当該部位ＣＧを越えて延伸された部分を押し戻しながら反転させつつ、ブロー成形を完了させる。これにより、延伸されたプリフォームＰＦをブロー成形型１００の成形面に密着させて、その形状を賦形する（図５参照）。 At this time, the preform PF can be uniformly stretched by appropriately adjusting the lowering speed of the stretching rod, the pressure of the blow air, etc., exceeding the portion CG for molding the ground contact portion 50 of the bottom 5 in the mold. Thus, the preform PF is stretched until it reaches the bottom mold BM located at the bottom dead center, thereby forming a molding intermediate MM (see FIG. 4). Next, the bottom mold BM is raised to the top dead center, and the blow-molding is completed while the portion extended beyond the portion CG is reversed while being reversed. Thereby, the stretched preform PF is brought into close contact with the molding surface of the blow mold 100, and the shape is shaped (see FIG. 5).
このようにして容器１を製造するにあたり、本実施形態にあっては、ブロー成形により延伸されたプリフォームＰＦの先端側が、底型挿通部の内周面１０１と、底型ＢＭの蓋体嵌入部成形部ＢＭ５３と、底型ＢＭの段部成形部ＢＭ５４とで囲まれる空間内に入り込み（図４参照）、型内の底部５の接地部５０を成形する部位ＣＧを越えて延伸された部分が、これを反転させて陥没凹部５１を成形するための反転代として十分な長さとなるようにすることができる。このため、底型ＢＭのストロークＳを長くせずとも、十分な長さの反転代を確保することが可能となる。さらに、本実施形態によれば、延伸されたプリフォームの先端側は、底型ＢＭの段部成形部ＢＭ５４によって規制されるため、反転代となる部分の延伸に過不足が生じないようにすることも可能であり、陥没凹部５１が設けられた底部５の形状を賦形性よく良好に成形することができる。 In manufacturing the container 1 in this way, in this embodiment, the front end side of the preform PF stretched by blow molding is inserted into the inner peripheral surface 101 of the bottom mold insertion portion and the lid of the bottom mold BM. A portion that extends into the space surrounded by the part molding part BM53 and the step part molding part BM54 of the bottom mold BM (see FIG. 4) and extends beyond the part CG for molding the grounding part 50 of the bottom part 5 in the mold. However, this can be reversed so that the length of the reversal for forming the depressed recess 51 is sufficient. For this reason, it is possible to ensure a sufficiently long reversal allowance without increasing the stroke S of the bottom mold BM. Furthermore, according to the present embodiment, since the leading end side of the stretched preform is regulated by the step forming portion BM54 of the bottom mold BM, it is ensured that there is no excess or deficiency in the stretching of the portion serving as the inversion allowance. It is also possible, and the shape of the bottom portion 5 provided with the depressed recess 51 can be formed well with good formability.
また、陥没凹部５１が設けられた底部５の形状を、賦形性よくより良好に成形できるようにするには、段部形成部ＢＭ５４は、底型ＢＭが下死点に位置したときに、型内の底部５の接地部５０を成形する部位ＣＧから段部形成部ＢＭ５４までの高さ方向に沿った距離が、基部成形部ＢＭ５２の高さＨと同等となる位置にあるのが好ましい。つまり、底型ＢＭのストロークＳは、基部成形部ＢＭ５２の高さＨの２倍であることが好ましい。さらに、基部成形部ＢＭ５２の下端部から蓋体嵌入部成形部ＢＭ５３の上端部までの高さｈは、２０ｍｍ以上であるのが好ましい。
なお、蓋体嵌入部成形部ＢＭ５３の側面と、基部成形部ＢＭ５２の側面は、抜き勾配を考慮してテーパー面とするのが好ましい。また、段部成形部ＢＭ５４の蓋体嵌入部成形部ＢＭ５３側には、賦形性を考慮してＲを付けるのが好ましい。
Further, in order to be able to better shape the shape of the bottom portion 5 provided with the depressed concave portion 51 with good formability, the step portion forming portion BM54 is formed when the bottom mold BM is located at the bottom dead center. It is preferable that the distance along the height direction from the part CG for molding the ground contact portion 50 of the bottom portion 5 in the mold to the step forming portion BM54 is at a position equal to the height H of the base forming portion BM52. That is, the stroke S of the bottom mold BM is preferably twice the height H of the base molding part BM52. Furthermore, it is preferable that the height h from the lower end part of the base molding part BM52 to the upper end part of the lid insertion part molding part BM53 is 20 mm or more.
In addition, it is preferable that the side surface of the lid insertion portion molding portion BM53 and the side surface of the base portion molding portion BM52 are tapered surfaces in consideration of the draft. Moreover, it is preferable to attach R to the lid insertion part molding part BM53 side of the step part molding part BM54 in consideration of shaping.
また、蓋体嵌入部成形部ＢＭ５３は、底型ＢＭの軸心を含む鉛直面において、底型挿通部の内周面１０１と、底型ＢＭの段部成形部ＢＭ５４のエッジ部を含む水平面と、底型ＢＭの蓋体嵌入部成形部ＢＭ５３の側面とに接する三点内接円ｉＣの曲率半径が、５以上となるように形成するのが好ましい（図３参照）。
なお、図３は、図２中一点鎖線で囲む部分を拡大して示す要部拡大図である。
Further, the lid insertion part molding part BM53 has a vertical plane including the axis of the bottom mold BM and a horizontal plane including the inner peripheral surface 101 of the bottom mold insertion part and the edge part of the step molding part BM54 of the bottom mold BM. The three-point inscribed circle iC that is in contact with the side surface of the lid fitting portion molding part BM53 of the bottom mold BM is preferably formed to have a curvature radius of 5 or more (see FIG. 3).
Note that FIG. 3 is an enlarged view of the main part showing the portion surrounded by the one-dot chain line in FIG. 2 in an enlarged manner.
このようにすることで、段部成形部ＢＭ５４に到達した延伸されたプリフォームＰＦの先端形状が、周方向に沿って不揃いとなるのを抑制することができる。これにより、成形中間体ＭＭの再現性の高い安定した成形が可能となり、ブロー成形における賦形性を向上させることができる。 By doing in this way, it can suppress that the front-end | tip shape of the stretched preform PF which reached | attained the step part shaping | molding part BM54 becomes uneven along the circumferential direction. As a result, the molding intermediate MM can be stably molded with high reproducibility, and the formability in blow molding can be improved.
その結果、ブロー成形を経て最終的に製造された容器１は、その軸心を含む鉛直面において、接地部５０の内周縁を通る鉛直線と、段部５４のエッジ部を含む水平面と、蓋体嵌入部５３の側面とに接する三点内接円の曲率半径が、５以上となるように形成され、底部５の形状が賦形性よく良好に成形されたものとなる。 As a result, the container 1 finally manufactured through blow molding has a vertical plane including the axis thereof, a vertical line passing through the inner peripheral edge of the ground contact portion 50, a horizontal plane including the edge portion of the step portion 54, a lid The three-point inscribed circle in contact with the side surface of the body fitting portion 53 is formed so that the radius of curvature is 5 or more, and the shape of the bottom portion 5 is well molded with good shapeability.
また、底型ＢＭを上昇させて、型内の底部の接地部５０を成形する部位ＣＧを越えて延伸された部分を押し戻しながら反転させる際に、当該部分は容器内方に巻き込まれながら底型ＢＭに賦形されて陥没凹部５１に成形される。このため、周方向に沿った長さ（周長）が一致せず、反転前と反転後の周長差に起因して、成形された陥没凹部５１に皺が発生してしまうことがある。 Further, when the bottom mold BM is raised and the portion extended beyond the portion CG for forming the ground contact portion 50 at the bottom in the mold is reversed while being pushed back, the bottom mold is wound while the portion is wound inside the container. It is shaped into the BM and formed into the depressed recess 51. For this reason, the length (peripheral length) along the circumferential direction does not match, and wrinkles may occur in the formed recessed recess 51 due to the difference in the circumferential length before and after the reversal.
底型ＢＭには、このような周長差を吸収して皺の発生を抑制し、又は皺が発生しても目立たなくようにするための凹凸形状を設けておくのが好ましい。
例えば、図６に示すように、蓋体嵌入部成形部ＢＭ５３の側面と段部成形部ＢＭ５４とに跨る複数の凸条ＢＭ５５を周方向に沿って形成することによって、当該凹凸形状を設けるようにしてもよい。このような凹凸形状を設けた底型ＢＭを用いて成形された容器１は、陥没凹部５１に、蓋体嵌入部５３の側面と段部５４とに跨る複数の凹溝が周方向に沿って形成され、顕著な皺の発生が抑制されたものとなる。
The bottom mold BM is preferably provided with an uneven shape for absorbing such a difference in circumferential length to suppress the generation of wrinkles or to make the bottom BM inconspicuous.
For example, as shown in FIG. 6, the concavo-convex shape is provided by forming a plurality of protrusions BM55 straddling the side surface of the lid insertion part forming part BM53 and the step part forming part BM54 along the circumferential direction. May be. In the container 1 formed using the bottom mold BM having such an uneven shape, a plurality of concave grooves straddling the side surface of the lid insertion portion 53 and the step portion 54 are provided in the recessed portion 51 along the circumferential direction. It is formed and remarkable wrinkle generation is suppressed.
また、底型ＢＭに設ける凹凸形状は、図７に示すように、基部成形部ＢＭ５２の側面に複数の凹溝ＢＭ５６を周方向に沿って形成することによって設けるようにしてもよい。このような凹凸形状を設けた底型ＢＭを用いて成形された容器１は、陥没凹部５１の基部５２の側面に複数の凸条が周方向に沿って形成され、顕著な皺の発生が抑制されたものとなる。 Further, the uneven shape provided in the bottom mold BM may be provided by forming a plurality of concave grooves BM56 along the circumferential direction on the side surface of the base molding part BM52 as shown in FIG. In the container 1 formed using the bottom mold BM provided with such a concave and convex shape, a plurality of ridges are formed along the circumferential direction on the side surface of the base 52 of the depressed concave portion 51 to suppress the occurrence of remarkable wrinkles. Will be.
また、図８に示すように、基部成形部ＢＭ５２を部分的に切り欠いて凹凸形状を設けることによっても顕著な皺の発生を抑制できるが、この場合には、基部成形部ＢＭ５２を部分的に切り欠いた部位ＢＭ５７に、蓋体嵌入部成形部ＢＭ５３の側面と面一となる面があらわれるようにするのが好ましい。このようにすることで、成形された容器１の陥没凹部５１には、蓋体嵌入部５３と面一に延在するリブ部５７が形成される（図９参照）。これにより、陥没凹部５１に挿入された他の容器１の口部側がリブ部５７によりサポートされ、容器１をより安定した状態で積み重ねることができる。このような態様とする場合、リブ部５７は、周方向に沿って等間隔に三つ以上形成するのが好ましい。 In addition, as shown in FIG. 8, it is possible to suppress the occurrence of significant wrinkles by partially cutting out the base molding part BM52 to provide an uneven shape, but in this case, the base molding part BM52 is partially It is preferable that a surface that is flush with the side surface of the lid insertion portion molding part BM53 appears in the notched portion BM57. By doing in this way, the recessed part 51 of the shape | molded container 1 is formed with the rib part 57 extended on the cover body insertion part 53 and the same plane (refer FIG. 9). Thereby, the opening part side of the other container 1 inserted in the depression recessed part 51 is supported by the rib part 57, and the container 1 can be stacked more stably. When setting it as such an aspect, it is preferable to form three or more the rib parts 57 at equal intervals along the circumferential direction.
以上、本発明について、好ましい実施形態を示して説明したが、本発明は、前述した実施形態にのみ限定されるものではなく、本発明の範囲で種々の変更実施が可能であることはいうまでもない。 Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. Nor.
例えば、前述した実施形態では、丸形ボトルと称される容器形状を有する容器１を図示して説明しているが、図示する例は、本発明の一実施形態を示しているに過ぎず、本発明が適用される容器形状は、図示するものには限定されない。本発明は、二以上の容器１を上下に積み重ねられるようにするために、底部５に設けた陥没凹部５１の形状に技術的な特徴があり、それ以外の部位の具体的な形状については、必要に応じて適宜変更することができる。 For example, in the above-described embodiment, the container 1 having a container shape called a round bottle is illustrated and described. However, the illustrated example is merely an embodiment of the present invention. The container shape to which the present invention is applied is not limited to that shown in the figure. The present invention has a technical feature in the shape of the depressed recess 51 provided in the bottom 5 in order to allow two or more containers 1 to be stacked one above the other. It can be changed as necessary.
すなわち、本発明は、底部５に設けられた陥没凹部５１が、底部５の接地部５０の内周縁に沿って立ち上る基部５２と、基部５２に対して同心状に縮径して、他の容器１の口部２に装着された蓋体６が遊嵌状に嵌入する蓋体嵌入部５３とを有し、基部５２と蓋体嵌入部５３とが段部５４を介して連接されていれば、これ以外の細部の構成は、前述した実施形態に限定されることなく適宜変更することができる。また、前述した実施形態で説明した細部の構成を適宜取捨選択して組み合わせることもできる。 That is, according to the present invention, a recessed portion 51 provided in the bottom portion 5 has a base 52 that rises along the inner peripheral edge of the grounding portion 50 of the bottom portion 5 and a diameter that is concentrically reduced with respect to the base portion 52. If the lid body 6 attached to the one mouth portion 2 has a lid insertion portion 53 into which the lid body 6 is loosely fitted, and the base portion 52 and the lid body insertion portion 53 are connected via the step portion 54. The configuration of details other than this can be changed as appropriate without being limited to the above-described embodiment. Further, the detailed configurations described in the above-described embodiments can be appropriately selected and combined.
本発明は、スタッキング可能な合成樹脂製容器として広く利用することができる。 The present invention can be widely used as a stackable synthetic resin container.
１ 容器
２ 口部
３ 肩部
４ 胴部
５ 底部
５０ 接地部
５１ 陥没凹部
５２ 基部
５３ 蓋体嵌入部
５４ 段部
１００ ブロー成形型
１０１ 底型挿通部の内周面
ＢＭ 底型
ＢＭ０ 摺動部
ＢＭ５２ 基部成形部
ＢＭ５３ 蓋体嵌入部成形部
ＢＭ５４ 段部成形部
DESCRIPTION OF SYMBOLS 1 Container 2 Mouth part 3 Shoulder part 4 Trunk part 5 Bottom part 50 Grounding part 51 Recessed recessed part 52 Base part 53 Cover body insertion part 54 Step part 100 Blow molding die 101 Inner peripheral surface of bottom mold insertion part BM Bottom type BM0 Sliding part BM52 Base molding part BM53 Lid fitting part molding part BM54 Step molding part
Claims (8)
前記陥没凹部が、
前記底部の接地部の内周縁に沿って立ち上る基部と、
前記基部に対して同心状に縮径して、前記他の容器の口部に装着された蓋体が遊嵌状に嵌入する蓋体嵌入部とを有し、
前記基部と前記蓋体嵌入部とが段部を介して連接されていることを特徴とする合成樹脂製容器。 A composition comprising a mouth, a shoulder, a body, and a bottom, and a recessed recess that can be inserted into the mouth of another container is provided on the bottom so that two or more containers can be stacked one above the other. A resin container,
The depressed recess is
A base that rises along the inner periphery of the bottom grounding portion;
A lid fitting portion that is concentrically reduced in diameter with respect to the base portion, and a lid body fitted in a mouth portion of the other container is fitted in a loose fit,
The synthetic resin container, wherein the base and the lid insertion portion are connected via a stepped portion.
前記陥没凹部に対応する形状の底型が、型内の前記接地部を成形する部位の内周縁に沿って穿設された底型挿通部に昇降可能に挿通されたブロー成形型を用い、
前記底型を下死点に待機させた状態でブロー成形を開始し、
次いで、前記底型を上死点まで上昇させてブロー成形を完了することを特徴とする合成樹脂製容器の製造方法。 A method for producing a synthetic resin container according to any one of claims 1 to 6,
A bottom mold having a shape corresponding to the depressed recess uses a blow mold inserted through a bottom mold insertion portion drilled along an inner peripheral edge of a portion for molding the grounding portion in the mold,
Start blow molding with the bottom mold waiting at the bottom dead center,
Next, the synthetic resin container manufacturing method is characterized in that the bottom mold is raised to the top dead center to complete blow molding.
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| JP7151139B2 (en) | 2018-04-09 | 2022-10-12 | 東洋製罐グループホールディングス株式会社 | Polylactic acid container and manufacturing method thereof |
| WO2021153671A1 (en) * | 2020-01-31 | 2021-08-05 | 日精エー・エス・ビー機械株式会社 | Mold, blow molding device, and injection molding device |
| JPWO2021153671A1 (en) * | 2020-01-31 | 2021-08-05 | ||
| JP7344993B2 (en) | 2020-01-31 | 2023-09-14 | 日精エー・エス・ビー機械株式会社 | Mold and blow molding equipment |
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