JP2021054068A - 樹脂製容器の製造装置および製造方法 - Google Patents
樹脂製容器の製造装置および製造方法 Download PDFInfo
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Abstract
Description
(第1実施形態)
図1は、本発明の第1実施形態に係るブロー成形装置(射出成形部、温度調整部、ブロー成形部、取出し部を有する)の斜視図を示し、図2は、射出成形部で射出成形されているプリフォームの正面から見た拡大断面図を示し、図3は、温度調整部でプリフォームを温調コアと温調ポットにより冷却する状態を示す断面図を示し、図4は、温度調整部でプリフォームを空気により冷却する状態を示す拡大断面図を示し、図5は、プリフォームがブロー成形部でブロー成形されている様子の断面図を示している。
の上方側(貯留部2の上側)の冷却強度を上げたい場合は、外方流通口64から内方流通口62aの方向にエアを流す。なお、プリフォーム1の特定部分を強く冷却し容器1aの特定部分の肉厚を大きくさせたい場合等には、予備ブローと冷却ブローとのエアの送風方向を同じに設定しても構わない。
肉厚3.85mmのプリフォームを従来技術により温度調整する際には、肉厚2.85mmのプリフォーム1を用いた場合と同様に、射出成形されたプリフォーム1を射出成形部で十分に冷却する必要があるため、射出成形工程に要する時間、すなわち、ネック型が射出成形部に待機している時間は約20.9秒以下となっている(プリフォーム1の射出成形時間は約14.9秒となる)。
また場合によっては、第一の均温化工程のみ又は第二の均温化工程のみを採用しても良いことは勿論である。
図10は、第2実施形態に係るブロー成形装置の模式図を示し、図11は、全行程の工程図を示している。なお、第2実施形態では第1実施形態と異なる部分について説明し、図中の第1実施形態と略同一の構成に対しては同一の符号を用いている。
先ず、射出成形工程にて、ブロー成形装置200は、図11に示すように、所定の射出時間をかけて5℃〜20℃に設定された射出成形型(第1実施形態の射出成形型11、12、50と同様の構成)の成形空間に材料を射出(充填)し、限りなく0(ゼロ)秒に近い短い所定の冷却時間を挟んだ後に、プリフォーム1の射出成形を完了させる。次いで、ブロー成形装置200は、所定の機械動作時間をかけて、プリフォーム1を射出成形ステーション110からや受け取りポット型(不図示)に取り出す(離型する、図10の工程1、図11の射出成形工程)。例えば、射出時間(充填時間)は3.0秒から3.5秒、冷却時間は0.5秒から1.0秒に、各々設定される。
ブロー成形装置200のネック型は、図13に示すように、リップ金型デザインが適用されていることにより、小型サイズの型締め装置で最大の取数、最大のネックサイズを可能にしている。なお、図13において、図13(a)は、プリフォーム1のサポートリングを射出キャビティ型との分割面(PL:パーティングライン)に設定した第一のリップ金型(標準リップ金型)を示し、図13(b)は、サポートリング下方の胴部上方を逆テーパデザインにして大きなサイズ(容量)の容器に適したプリフォーム1の形成を可能にする第二のリップ金型(シングルリップ金型)を示し、図13(c)は、リップ金型のサイズを小さくして上下端に二つの縮径部(テーパー部と逆テーパー部)を配してプリフォーム1の射出成形時の型締め力を軽減させることができる第三のリップ金型(ダブルリップ金型)を示している。
1a…容器
2…貯留部
2a…胴部
2b…底部
3…ネック部
4…ゲート
5…壁部
6…レール
10…射出成形部
11…射出コア型
12…射出キャビティ型
20…温度調整部
21…温調コア型
22…温調キャビティ型
30…ブロー成形部
31…ブロー型
40…取出部
50…ネック型
61…エア導入部材
62…ロッド部材
62a…内方流通口
63…嵌合コア
64…外方流通口
100…ブロー成形装置
101…射出成形工程
102…第一の均温化工程
103…温調工程
104…ブロー成形工程
105…取り出し工程
106…第二の均温化工程
110…射出成形ステーション
115…後冷却ステーション
120…温度調整ステーション
130…ブロー成形ステーション
200…ブロー成形装置
Z…軸心
Claims (10)
- プリフォームを射出成形する射出成形部と、前記射出成形部で成形した前記プリフォームを温度調整する温度調整部とを備え、前記温度調整部で温度調整した前記プリフォームをブロー成形する、樹脂製容器の製造装置において、
前記射出成形部で成形した前記プリフォームの外側表面温度が内側表面温度より高くなる前に前記プリフォームを前記温度調整部に搬入し、
前記温度調整部にて前記プリフォームの少なくとも外側表面温度が前記温度調整部に搬入された時点と比較して10℃から50℃の温度範囲だけ低下するように冷却させる、樹脂製容器の製造装置。 - 請求項1に記載の樹脂製容器の製造装置において、前記プリフォームを成形する樹脂材料のガラス転移温度が50℃以上150℃以下、肉厚が1.5mm以上4.0mm以下である場合に、前記プリフォームの外側表面温度が110℃以上150℃以下の状態で前記プリフォームを前記温度調整部に搬入することを特徴とする、樹脂製容器の製造装置。
- 請求項1に記載の樹脂製容器の製造装置において、前記プリフォームのガラス転移温度が50℃以上150℃以下、肉厚が3.0mm以上10.0mm以下である場合に、前記プリフォームの外側表面温度が100℃以上140℃以下である状態で前記プリフォームを前記温度調整部に搬入することを特徴とする、樹脂製容器の製造装置。
- 請求項1に記載の樹脂製容器の製造装置において、前記温度調整部は、温調コア型と温調キャビティ型とで前記プリフォームを挟んで圧縮変形させて冷却することを特徴とする、樹脂製容器の製造装置。
- 請求項1に記載の樹脂製容器の製造装置において、前記温度調整部は、前記プリフォームの内側に空気を循環させて冷却することを特徴とする、樹脂製容器の製造装置。
- プリフォームを射出成形し、射出成形した前記プリフォームを温度調整部で温度調整し、温度調整した前記プリフォームをブロー成形する、樹脂製容器の製造方法において、
射出成形した前記プリフォームの外側表面温度が内側表面温度より高くなる前に前記プリフォームを前記温度調整部に搬入し、
前記温度調整部にて前記プリフォームの少なくとも外表面温度が温調部に搬入された時点と比較して10℃から50℃の温度範囲だけ低下するように冷却させる、
樹脂製容器の製造方法。 - 請求項6に記載の樹脂製容器の製造方法において、前記プリフォームを成形する樹脂材料のガラス転移温度が50℃以上150℃以下、肉厚が1.5mm以上4.0mm以下である場合に、前記プリフォームの外側表面温度が110℃以上150℃以下の状態で前記プリフォームを前記温度調整部に挿入することを特徴とする、樹脂製容器の製造方法。
- 請求項6に記載の樹脂製容器の製造方法において、前記プリフォームを成形する樹脂材料のガラス転移温度が50℃以上150℃以下、肉厚が3.0mm以上10.0mm以下である場合に、前記プリフォームの外側表面温度が100℃以上140℃以下である状態で前記プリフォームを前記温度調整部に挿入することを特徴とする、樹脂製容器の製造方法。
- 請求項6に記載の樹脂製容器の製造方法において、前記温度調整部は、温調コア型と温調キャビティ型とで前記プリフォームを挟んで圧縮変形させて冷却することを特徴とする、樹脂製容器の製造方法。
- 請求項6に記載の樹脂製容器の製造方法において、前記温度調整部は、前記プリフォームの内側に空気を循環させて冷却することを特徴とする、樹脂製容器の製造方法。
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