JP2015066750A - 樹脂製容器の製造方法 - Google Patents
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Abstract
【解決手段】第1部材10とレーザー光を透過する樹脂により成形されている第2部材20を用い、第1部材の端部15の内側に第2部材の端部25を挿入する連結ステップと、連結ステップによって第1部材の端部内周面16と第2部材の端部外周面26とが積層された領域を溶着領域30として、当該溶着領域に向けてレーザー光Lを照射して第1部材と第2部材の端部同士を溶着させるレーザー溶着ステップとを含み、レーザー溶着ステップでは、第2部材の前記溶着領域以外の部位Pから前記レーザー光を入射するともに、当該レーザー光を前記第2部材の内部空間を横断させて前記溶着領域に照射することで、溶着領域における前記第1部材の端部内周面と第2部材の端部外周面とを溶着させる樹脂製容器1の製造方法としている。
【選択図】図2
Description
端部が筒状に成形された樹脂材料からなる第1部材と、端部が筒状に成形されているとともにレーザー光を透過する樹脂材料からなる第2部材を用い、
前記第1部材の端部の内側に前記第2部材の端部を挿入する連結ステップと、
前記連結ステップによって前記第1部材の端部内周面と前記第2部材の端部外周面とが積層された領域を溶着領域として、当該溶着領域に向けてレーザー光を照射して前記第1部材と前記第2部材の端部同士を溶着させるレーザー溶着ステップとを含み、
前記レーザー溶着ステップでは、前記第2部材の前記溶着領域以外の部位から前記レーザー光を入射するともに、当該レーザー光を前記第2部材の内部空間を横断させて前記溶着領域に照射することで、前記溶着領域における前記第1部材の端部内周面と前記第2部材の端部外周面とを溶着させる、
ことを特徴とする樹脂製容器の製造方法としている。
本発明の第1の実施例に係る樹脂製容器の製造方法として、図1に示したように、円筒状のスリーブ部11の両端に首部(12,22)を備えたチューブ容器1をレーザー溶着技術を用いて製造する方法を挙げる。図2は本実施例における製造方法の概略であり、図2(A)〜(D)の順に従ってその方法の流れを説明する。なお図2では、便宜的に円筒状のスリーブ部11の円筒軸40方向を上下方向とし、上下方向と直交する方向を側方としている。また、スリーブ部11に連続して首部12が下方に一体成形されていることとする。そして図2では、円筒軸40を含む側方断面と、外表面とが紙面上で左右対称となるように示されている。また、図2(D)は(C)の一部を拡大した図である。
第1の実施例に係る樹脂製容器の製造方法では、光透過性材料からなるヘッド部材20からレーザー光Lを入射し、溶着領域30の内側にそのレーザー光Lを照射していた。ヘッド部材20におけるレーザー光Lの入射位置Pは、そのレーザー光Lを透過させることができればどの位置でもよいが、入射位置Pにおけるヘッド部材20の表面形状によってはレーザー光Lの強度が減衰する可能性がある。
第1の実施例において、溶着領域30では着色されたチューブ本体部材10の内周面16と光透過性を有するヘッド部材20の外周面26とを溶着させることで、溶着部位が外部から見えず、美観に優れたチューブ容器を製造することができた。しかし、溶着領域30におけるチューブ本体部材10の厚さが薄い場合、レーザー光Lの出力が過剰である場合、あるいは光学系を用いて溶着領域30に照射するレーザー光Lを集光し過ぎた場合などでは、溶着領域30に過剰なエネルギーのレーザー光Lが照射され、チューブ本体部材10が溶着領域30で外観に影響を与えるほど変形する可能性がある。そこで、本発明の第2の実施例として、外観に影響を及ぼすような溶着領域30での変形を確実に防止するための樹脂製容器の製造方法を挙げる。なお、ここで製造する樹脂製容器も図1に示した首部(12,22)が上下両端にあるチューブ容器1であるものとする。
上記第1および第2の実施例では、着色されたチューブ本体部材10と光透過性材料からなるヘッド部材20とをレーザー溶着していたが、もちろん、ヘッド部材20が着色されていて、チューブ本体部材10が光透過性材料で成形されていてもよい。この場合、溶着領域30では、ヘッド部材20が外側に配置され、レーザー光Lはチューブ本体部材10側から入射されることになる。
11 スリーブ部、12 首部、20 ヘッド部材、22 首部、30 溶着領域、
100 狭圧リング、L レーザー光、P レーザー光の入射位置
Claims (5)
- 内容物を取り出し可能に収納する樹脂製容器の製造方法であって、
端部が筒状に成形された樹脂材料からなる第1部材と、端部が筒状に成形されているとともにレーザー光を透過する樹脂材料からなる第2部材を用い、
前記第1部材の端部の内側に前記第2部材の端部を挿入する連結ステップと、
前記連結ステップによって前記第1部材の端部内周面と前記第2部材の端部外周面とが積層された領域を溶着領域として、当該溶着領域に向けてレーザー光を照射して前記第1部材と前記第2部材の端部同士を溶着させるレーザー溶着ステップとを含み、
前記レーザー溶着ステップでは、前記第2部材の前記溶着領域以外の部位から前記レーザー光を入射するともに、当該レーザー光を前記第2部材の内部空間を横断させて前記溶着領域に照射することで、前記溶着領域における前記第1部材の端部内周面と前記第2部材の端部外周面とを溶着させる、
ことを特徴とする樹脂製容器の製造方法。 - 請求項1において、前記第1部材は、少なくとも前記溶着領域に対応する部位が着色されていることを特徴とする樹脂製容器の製造方法。
- 請求項1において、前記第1部材はレーザー光を透過する樹脂材料からなるとともに、前記溶着領域に対応する前記第1部材の内周面あるいは前記第2部材の外周面のいずれか一方がレーザー光を吸収するように構成されていることを特徴とする樹脂製容器の製造方法。
- 請求項1〜3のいずれかにおいて、前記レーザー溶着ステップでは、前記溶着領域の外表面形状を固定するための狭圧リングを前記第1部材の前記端部の外周に装着した状態で前記レーザー溶着ステップを実行することを特徴とする樹脂製容器の製造方法。
- 請求項1〜4のいずれかにおいて、前記樹脂製容器は、前記内容物を収納する筒状の容器本体部の両端に首部を備え、前記第1部材と前記第2部材のいずれか一方が前記容器本体部と一方の首部とが一体成形されてなることを特徴とする樹脂製容器の製造方法。
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