JP6516122B2 - 二重容器の製造方法 - Google Patents
二重容器の製造方法 Download PDFInfo
- Publication number
- JP6516122B2 JP6516122B2 JP2014166829A JP2014166829A JP6516122B2 JP 6516122 B2 JP6516122 B2 JP 6516122B2 JP 2014166829 A JP2014166829 A JP 2014166829A JP 2014166829 A JP2014166829 A JP 2014166829A JP 6516122 B2 JP6516122 B2 JP 6516122B2
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- JP
- Japan
- Prior art keywords
- parison
- container
- outer layer
- double container
- inner layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Moulds For Moulding Plastics Or The Like (AREA)
Description
すなわち、一般の容器において、収容物の充填後、容器内の空間を真空にしたり窒素ガス等の不活性ガスを充填すること等によって、充填容器を開封するまで収容物の酸化を防ぐことは容易である。しかし、一般的には、容器を開封して収容物を一部消費し、容器内に使用残りの収容物が残留している状態では、容器内に収容物の消費量に対応した容積の外気が入り、残留収容物が酸化する。この酸化を防ぐため、収容物に酸化防止剤を含有することもある。
本発明は、比較的剛性な外容器と、該外容器内で収容物の充填量に対応して容量を変更可能な柔軟内容器とからなる二重容器において、特に外気を入れるための開口に関する上述した問題点に鑑みてなされたものであって、従来と大きく変わらない成形装置によって容易に製造可能で、比較的剛性な外容器と、該外容器内で収容物の充填量に対応して容量を変更可能な二重容器において外気を入れるための開口を、極めて容易に且つ確実に、従来技術による加工コストより低いコストで形成することができる二重容器の製造方法を提供することを目的とする。
成形後互いに剥離可能な剛性外層容器部と柔軟性内層容器部とを形成する内層及び外層の少なくとも2層を有するパリソンから、一対の部分金型を組み合わせた割金型を使用して容器を成形し、前記剛性外層容器部と前記柔軟性内層容器部との間に外気を導入して、前記剛性外層容器部の形状を維持しながら、前記柔軟性内層容器部の容量を縮小させる二重容器の製造方法において、
前記一対の部分金型が組み合わされて前記割金型を作るために相互に近寄る際に、前記一対の部分金型の合わせ面の一部が、パリソンの前記剛性外層と前記柔軟性内層を水平対向位置の両側部分で挟み込むことを特徴とする二重容器の製造方法
である。
成形後互いに剥離可能な剛性外層容器部と柔軟性内層容器部とを形成する内層及び外層の少なくとも2層を有するパリソンから、一対の部分金型を組み合わせた割金型を使用して容器を成形し、前記剛性外層容器部と前記柔軟性内層容器部との間に外気を導入して、前記剛性外層容器部の形状を維持しながら、前記柔軟性内層容器部の容量を縮小させる二重容器の製造方法において、
前記一対の部分金型が組み合わされて前記割金型を作るために相互に近寄る際に、前記一対の部分金型の合わせ面におけるパリソンの円筒外面の接触面と直交する部分が、前記二重容器の上方半分の領域内でパリソンを挟み込むことを特徴とする二重容器の製造方法
である。
前記本発明において、前記一対の部分金型の合わせ面の少なくとも一部が、パリソンの剛性外層を水平対向位置の両側部分で挟み込むことを特徴とする。
(発明の第2実施態様)
前記本発明において、前記一対の部分金型の合わせ面の少なくとも一部が、パリソンの剛性外層と柔軟性内層を水平対向位置の両側部分で挟み込むことを特徴とする。
(発明の第3実施態様)
前記本発明において、前記一対の部分金型の合わせ面の一部が前記パリソンを挟み込む部分の外側に、前記パリソンから作られる摘み突起部を形成することを特徴とする。
(発明の第4実施態様)
前記本発明において、前記一対の部分金型の当たり面の一部が前記パリソンを挟み込む部分は、二重容器の首肩部であることを特徴とする。
(発明の第5実施態様)
前記本発明において、前記一対の部分金型の当たり面の一部が前記パリソンを挟み込む部分は、二重容器の口部であることを特徴とする。
(発明の第6実施態様)
前記本発明において、前記一対の部分金型の当たり面の一部が前記パリソンを挟み込む部分は、二重容器の螺合口部であることを特徴とする。
第1実施形態の製造方法によって製造される二重容器10は、口部12,首肩部14、円筒部18,及び底部20からなる。
続いて、図3cに示すように、パリソンP内にエアがブローピン84から吹き込まれると、パリソンPの上方端部分が吹き出るエアによって上広形に押し広げられる。
続いて、ブローピン84の大径筒部分84Lの下縁角部88が口部金型部分100の上端部90から上方へ延びる上広円錐面80Cに当接する。この当接によって、パリソンPが切断されて、口バリ92が除去される。
成形可能な状態のパリソンPを、図6及び図7aに示すように、向き合った一対の部分金型60の間に芯合わせして配置する。
底部20の中央横断部は、図8に示すように、割金型の合わせ面Hの前後方向の領域のパリソンPが互いに押し付けられて一体化し、該一体化した部分の両側に外層32が存在する。従って、このままでは、柔軟性内層30と剛性外層32の間に接着性がなく容易に剥離可能であるから、底部20における柔軟性内層30と剛性外層32の間に隙間ができる可能性が高い。この隙間から水等を吸い込む等好ましくない状況になる恐れがある。この恐れを取り除くため、底部20における柔軟性内層30と剛性外層32の端部を接着剤150によって覆い被せている。
第2実施形態の製造方法によって製造される二重容器10は、ポリアミド(PA)の柔軟性内層30と、ポリプロピレン(PP)の剛性外層32とからなる。柔軟性内層30と剛性外層32の間には、接着性はなく、容易に剥離可能である。
第3実施形態の製造方法によって製造される二重容器は、内側から、低密度ポリエチレン(LDPE)層、ポリオフィン系接着性樹脂等の接着剤層、及びエチレンビニルアルコール共重合体(EVOH)層の3層の柔軟性内層30と、ポリカーボネート(PC)の剛性外層32とからなる。柔軟性内層30と剛性外層32の間には、接着性はなく、容易に剥離可能である。
口部金型部分100及び首肩部金型部分112は、一体的に、ダイス鋼SKD11によって作られる。
第4実施形態の製造方法によって製造される二重容器は、内側から、低密度ポリエチレン(LDPE)と接着性樹脂のブレンド層、エチレンビニルアルコール共重合体(EVOH)、ポリオフィン系接着性樹脂等の接着剤層、及びエチレンビニルアルコール共重合体(EVOH)の4層の柔軟性内層30と、ポリプロピレン(PP)の剛性外層32とからなる。柔軟性内層30と剛性外層32の間には、接着性はなく、容易に剥離可能である。
口部金型部分100及び首肩部金型部分112は、一体的に、プリハードン鋼(NAK55)によって作られる。
PP ピンチ部
10 二重容器
18 円筒部
22 円筒部側面
24 低密度ポリエチレン(LDPE)層
26 接着剤層
28 エチレンビニルアルコール共重合体(EVOH)層
30 柔軟性内層
32 剛性外層
60 部分金型
64 口バリ部領域
66 口部領域
68 首肩部領域
70 円筒側壁部領域
72 底部領域
80 口バリ金型部分
84 ピン
86 縦貫通孔
88 下縁角部
92 口バリ
100 口部金型部分
110 外層隙間
112 首肩部金型部分
120 挟み部分
130 隙間バリ
140 隙間バリ凹部
142 斜面
144 底バリ
500 余剰パリソン凹部
Claims (7)
- 成形後互いに剥離可能な剛性外層容器部と柔軟性内層容器部とを形成する内層及び外層の少なくとも2層を有するパリソンから、一対の部分金型を組み合わせた割金型を使用して容器を成形し、前記剛性外層容器部と前記柔軟性内層容器部との間に外気を導入して、前記剛性外層容器部の形状を維持しながら、前記柔軟性内層容器部の容量を縮小させる二重容器の製造方法において、
前記一対の部分金型が組み合わされて前記割金型を作るために相互に近寄る際に、前記一対の部分金型の合わせ面の少なくとも一部が、パリソンの前記内層及び外層を水平対向位置の両側部分で挟み込み、該挟み込みによって形成されてパリソンの円筒中心線を含む平面内で延びる隙間ばりを形成し、該隙間バリを取り去った跡に露出している前記剛性外層容器部及び柔軟性内層容器部の端部の剥離空間から外気を導入させることを特徴とする二重容器の製造方法。 - 前記一対の部分金型の合わせ面の少なくとも一部が、パリソンの剛性外層を水平対向位置の両側部分で挟み込むことを特徴とする請求項1に記載の二重容器の製造方法。
- 前記一対の部分金型の合わせ面の少なくとも一部が、パリソンの剛性外層と柔軟性内層を水平対向位置の両側部分で挟み込むことを特徴とする請求項1に記載の二重容器の製造方法。
- 前記一対の部分金型の合わせ面の一部が前記パリソンを挟み込む部分の外側に、前記パリソンから作られる摘み突起部を形成することを特徴とする請求項1に記載の二重容器の製造方法。
- 前記一対の部分金型の当たり面の一部が前記パリソンを挟み込む部分は、二重容器の首肩部であることを特徴とする請求項1に記載の二重容器の製造方法。
- 前記一対の部分金型の当たり面の一部が前記パリソンを挟み込む部分は、二重容器の口部であることを特徴とする請求項1に記載の二重容器の製造方法。
- 前記一対の部分金型の当たり面の一部が前記パリソンを挟み込む部分は、二重容器の螺合口部であることを特徴とする請求項1に記載の二重容器の製造方法。
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