JP7452063B2 - 合成樹脂製容器及びその製造方法 - Google Patents
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Description
まず、本発明の実施形態に係る合成樹脂製容器について説明する。
図1は、本実施形態に係る合成樹脂製容器の概略を示す正面図であり、図2は、図1のA-A端面図、図3は、図1のB-B端面図である。
また、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(図1に示す状態)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、口部2の下端側には、周方向に沿って外方に突出する環状のネックリング22が設けられている。
なお、窪み部7の底面7aは、軸方向に沿って平行又は傾斜した面とすることができ、平面であっても曲面であってもよい。
次に、本発明の実施形態に係る合成樹脂製容器の製造方法について説明する。
図5は、本実施形態に用いるブロー成形型の一例について、その概略を示す説明図である。
なお、図5には、ブロー成形型100にセットされたプリフォーム10を一点鎖線で示している。
なお、上記のようにして被覆層5に線状薄肉部5cを形成することができれば、突条部106の両端縁に沿って形成されるエッジ部106aには、図7に示すようにRをつけてもよい。
なお、上記のようにして、被覆層5に、厚肉部5aと薄肉部5bとを連接させて形成することができれば、突出部107の周縁に形成されるエッジ部107aには、図10に示すようにRをつけてもよい。
このような形状となるように突出部107を設けると、プリフォーム本体10aと突出部107の上面との間で押圧されて、突出部107の上面から周縁側にはみ出す被覆材層50が、当該側面の中央側に集まるようなり、これによって、被覆層5に形成される厚肉部5aをより厚肉にして、薄肉部5b側からより容易に切り離すことができるようになるため好ましい。
例えば、容器本体1aを形成する樹脂材料として、エチレンテレフタレート系熱可塑性ポリエステルを用いる場合、被覆層5を形成する樹脂材料には、ポリプロピレン(融点:160~170℃)、ポリエチレン(融点:95~140℃)等のポリオレフィン系樹脂を用いることができる。ポリオレフィン系樹脂は、一般に、エチレンテレフタレート系熱可塑性ポリエステルよりも融点が低いため、ブロー成形に際して、プリフォーム10を加熱して、プリフォーム本体10aを延伸可能に軟化させつつ、被覆材層50を熔融状態又は半熔融状態とする際の加熱温度の調整が容易となるため好ましいが、これに限定されない。
例えば、容器1にガスバリア性が要求される場合には、被覆層5を形成する樹脂材料に、エチレン-ビニルアルコール共重合体やポリメタキシリレンアジパミド(MXD6)等のガスバリア性を有する熱可塑性樹脂を用いることもできる。
図14及び図15に示すように、突出部107をM字状に設けて、突条部106に連接する側とは反対の側も、周縁にエッジ部107bが形成されるように、切り立った形状としてもよい。このようにすることで、容器本体1aに賦形された窪み部7の帯状凹部6と反対側の縁部上にも、被覆層5を引き裂く起点となる厚肉部を形成することができる。
なお、図14は、図6に示す例と同様にして、突出部107の上記変形例を斜視して示すキャビティ面の要部斜視図であり、図15は、図14のE-E端面図である。
なお、図16は、図6に示す例と同様にして、突出部107の上記変形例を斜視して示すキャビティ面の要部斜視図であり、図17は、図16のF-F端面図である。
1a 容器本体
5 被覆層
5a 厚肉部
5b 薄肉部
5c 線状薄肉部(引き裂きガイド部)
6 帯状凹部
6a 帯状凹部の底面
6b 段差部
7 窪み部
7a 窪み部の底面
7b 縁部
10 プリフォーム
10a プリフォーム本体
50 被覆材層
100 ブロー成形型
106 突条部
106a エッジ部
107 突出部
107a エッジ部
Claims (5)
- 所定の容器形状に成形された容器本体と、前記容器本体の外周面側に積層された被覆層とを有する合成樹脂製容器であって、
前記容器本体には、周囲より低く落ち込んだ窪み部が設けられており、
前記被覆層には、前記窪み部の底面から***した前記窪み部の縁部上に位置する部位に、前記被覆層の厚みが周囲に比して厚肉となった厚肉部が形成されているとともに、前記厚肉部に連接し、かつ、前記窪み部の底面側上に位置する部位に、前記被覆層の厚みが周囲に比して薄肉となった薄肉部が形成されていることを特徴とする合成樹脂製容器。 - 前記被覆層には、前記厚肉部を起点とする引き裂きガイド部が形成されている請求項1に記載の合成樹脂製容器。
- 前記容器本体には、容器内方に窪んで帯状に延在する帯状凹部が設けられているとともに、前記帯状凹部の一端側に前記窪み部が連接して設けられ、
前記被覆層には、前記帯状凹部の幅方向の両端縁に形成された段差部に沿って、周囲に比して線状に薄肉とされた線状薄肉部が、前記引き裂きガイド部として形成されているとともに、前記窪み部の底面から***して前記帯状凹部の底面に連なる前記窪み部の縁部上に位置する部位に、前記厚肉部が形成されている請求項2に記載の合成樹脂製容器。 - 所定の容器形状に成形された容器本体と、前記容器本体の外周面側に積層された被覆層とを有する合成樹脂製容器の製造方法であって、
有底筒状のプリフォーム本体と、前記プリフォーム本体の外周面側に積層された被覆材層とを有するプリフォームを加熱して、前記プリフォーム本体を延伸可能に軟化させつつ、前記被覆材層を熔融状態又は半熔融状態としてから、
キャビティ面に、前記容器本体に周囲より低く落ち込んだ窪み部を賦形する突出部が、周縁にエッジ部が形成されるように切り立って設けられたブロー成形型内で前記プリフォームをブロー成形し、
延伸された前記プリフォーム本体と前記突出部とに挟まれた前記被覆材層を、前記突出部の前記エッジ部が形成された周縁側にはみ出すように流動させることにより、
前記突出部の前記エッジ部が形成された周縁側では、前記被覆材層を厚肉に成形しつつ、前記プリフォーム本体と前記突出部の上面とに挟まれた前記被覆材層を薄肉に成形することを特徴とする合成樹脂製容器の製造方法。 - 前記ブロー成形型のキャビティ面に、一端側に前記突出部が連接されて、前記容器本体に容器内方に窪んで帯状に延在する帯状凹部を賦形する突条部を、両端縁に沿ってエッジ部が形成されるように切り立って設けておき、
前記突条部の両端縁に沿って形成された前記エッジ部に、前記被覆材層を圧接させて、当該エッジ部に沿って線状に薄肉となるように前記被覆材層を成形する請求項4に記載の合成樹脂製容器の製造方法。
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