WO2021106929A1 - 樹脂製容器の製造方法および製造装置 - Google Patents
樹脂製容器の製造方法および製造装置 Download PDFInfo
- Publication number
- WO2021106929A1 WO2021106929A1 PCT/JP2020/043813 JP2020043813W WO2021106929A1 WO 2021106929 A1 WO2021106929 A1 WO 2021106929A1 JP 2020043813 W JP2020043813 W JP 2020043813W WO 2021106929 A1 WO2021106929 A1 WO 2021106929A1
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- WO
- WIPO (PCT)
- Prior art keywords
- preform
- blow
- container
- layer
- injection molding
- Prior art date
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-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
Definitions
- a resin container having a thick portion and a good appearance can be manufactured in a short molding cycle.
- FIG. 8 (a).
- (A) is a vertical sectional view of a preform applied to the manufacture of the container of the second embodiment, and (b) is a sectional view taken along line IXb-IXb of FIG. 9 (a). It is a figure which shows the positional relationship of a blow cavity type and a preform when a blow cavity type is closed.
- the body portion 13 and the bottom portion 14 of the container 10 have a structure in which a first layer facing the inner surface of the container and a second layer facing the outer surface of the container are laminated.
- This structure is formed by blow molding the preform 20 described later.
- the preform 20 of FIG. 3A is formed as follows. First, an intermediate molded body 20A (FIG. 3B) having a body portion 21, a bottom portion 22 and a neck portion 23 is injection-molded with the material of the first layer 24. After that, the preform 20 is formed by further injection molding the material of the second layer 25 on the outer periphery of the body portion 21 and the bottom portion 22 of the intermediate molded body 20A.
- the first injection molding unit 31 the above-mentioned injection cavity type and injection core type and the neck type of the transport mechanism 36 are closed to form a mold space for the intermediate molded body 20A. Then, by pouring the resin material from the first injection device 37 into the mold space, the first injection molding unit 31 manufactures an intermediate molded body 20A corresponding to the first layer 24 of the preform 20.
- the raw material of the second layer 25 is a thermoplastic synthetic resin, and the specific type of the material is the same as the description of the raw material of the first layer 24.
- the composition of the raw material of the second layer 25 may be the same as or different from that of the first layer 24.
- the same resin material may be used for the first layer 24 and the second layer 25, or different materials may be used.
- the amount of the coloring material, the type of the coloring material, and the like may be changed in each of the materials of the first layer 24 and the second layer 25.
- the temperature adjusting unit 33 equalizes the temperature of the preform 20 conveyed from the second injection molding unit 32 and removes the uneven temperature, and sets the temperature of the preform 20 to a temperature suitable for final blowing (for example, about 90 ° C. to 105 ° C.). ).
- the temperature adjusting unit 33 also has a function of cooling the preform 20 in a high temperature state after injection molding.
- the rotating plate of the transport mechanism 36 rotates by a predetermined angle, and the temperature-adjusted preform 20 held in the neck mold is transported to the blow molding unit 34.
- the bottom portion 22 of the preform 20 can be formed to be thicker than in the case where only one injection molding step is performed, and the bottom portion 14 of the container 10 can be formed. Can be formed thicker.
- the intermediate molded body of the preform corresponding to the first layer is formed in the first injection molding step, and the second layer is injected onto the outer periphery of the intermediate molded body in the second injection molding step. Molding was performed to obtain a preform having a two-layer structure.
- the vertical cross-sectional shape of the preform of the embodiment is the same as that in FIG. 3 (a).
- the thick preform 20B shown in FIG. 7 was injection-molded in one injection molding step.
- the first layer 24 and the second layer 25 of the preform 20 of the example were molded using the same material, specifically, PET resin (IP252BB1 or PIFG30) manufactured by Bell Polyproduct Co., Ltd.
- the second embodiment is a modification of the first embodiment, and shows a configuration example of a container in which a plurality of grooves extending in the axial direction are formed on the outer peripheral surface of the container body.
- the same elements as those of the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.
- FIG. 9 (a) is a vertical sectional view of the grooved preform 200 applied to the manufacture of the container 100 of the second embodiment
- FIG. 9 (b) is a sectional view taken along line IXb-IXb of FIG. 9 (a). Is.
- the blow cavity mold 50 having a shape corresponding to the container 100 is closed and the grooved preform 200 is housed in the mold space.
- the shape of the blow cavity type 50 corresponds to the shape of the container 100.
- the concave portion 51 of the blow cavity type 50 corresponds to the shape of the convex portion 102 of the container 100
- the convex portion 52 of the blow cavity type 50 corresponds to the bottom of the groove 101 of the container 100.
- the air introduction member By lowering the air introduction member (blow core) with respect to the blow cavity type 50 and the preform 200 arranged in the above positional relationship, the air introduction member comes into contact with the neck portion 23 of the preform 200. Then, the drawing rod is lowered to suppress the bottom portion 22 of the preform 200 from the inner surface, and the preform 200 is stretched on the horizontal axis by supplying blow air from the air introduction member while stretching the vertical axis as necessary. ..
- the preform 200 swells due to the introduction of blow air, the convex portion 202 of the preform 200 enters the concave portion 51 of the blow cavity type 50, and the groove 201 of the preform 200 is pressed against the convex portion 52 of the blow cavity type 50. , Shaped into the shape of the container 100.
- the angle of the top of the convex portion 202 of the preform 200 is smaller than the angle of the top of the convex portion 102 of the container 100 (the opening angle of the concave portion 51 of the blow cavity type 50). Therefore, at the time of blow molding, the convex portion 202 of the preform 200, which is narrower than the concave portion 51, easily penetrates into the concave portion 51 of the blow cavity type 50. Therefore, since the convex portion 202 of the preform 200 can be more reliably guided to the space of the concave portion 51 of the blow cavity type 50, the processing accuracy and appearance of the container 100 can be further improved.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
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- Thermal Sciences (AREA)
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Abstract
Description
実施形態では説明を分かり易くするため、本発明の主要部以外の構造や要素については、簡略化または省略して説明する。また、図面において、同じ要素には同じ符号を付す。なお、図面に示す各要素の形状、寸法などは模式的に示したもので、実際の形状、寸法などを示すものではない。
<樹脂製容器の構成例>
まず、図1、図2を参照して、第1実施形態に係る樹脂製容器(以下、単に容器とも称する)10の構成例を説明する。
図1は第1実施形態の容器10の正面図であり、図2は、図1に示す容器10の縦断面図である。
図3は、第1実施形態の容器10の製造に適用されるプリフォーム20の例を示す。
図3(a)は、プリフォーム20の縦断面図であり、図3(b)は、プリフォーム20の中間成形体20Aの縦断面図である。
図4は、第1実施形態のブロー成形装置30の構成を模式的に示す図である。第1実施形態のブロー成形装置30は、容器の製造装置の一例であって、プリフォーム20を室温まで冷却せずに射出成形時の保有熱(内部熱量)を活用して容器をブロー成形するホットパリソン方式(1ステージ方式とも称する)を採用する。
搬送機構36は、図4の紙面垂直方向の軸を中心に回転する回転板(不図示)を備える。回転板には、プリフォーム20の首部23(または容器10の首部12)を保持する不図示のネック型が、所定角度ごとにそれぞれ1以上配置されている。搬送機構36は、回転板を回転させることで、ネック型で首部23が保持されたプリフォーム20(または容器10)を、第1射出成形部31、第2射出成形部32、温度調整部33、ブロー成形部34、取り出し部35の順に搬送する。なお、搬送機構36は、回転板を昇降させることもでき、第1射出成形部31や第2射出成形部32における型閉じや型開き(離型)に係る動作も行う。
第1射出成形部31は、それぞれ図示を省略する射出キャビティ型、射出コア型を備え、図3(B)に示すプリフォーム20の中間成形体20Aを製造する。第1射出成形部31には、プリフォーム20の第1層24の原材料(樹脂材料)を供給する第1射出装置37が接続されている。
第2射出成形部32は、図示を省略する射出キャビティ型を備え、中間成形体20Aの外周部に第2層25を射出成形する。第2射出成形部32には、プリフォーム20の第2層25の原材料(樹脂材料)を供給する第2射出装置38が接続されている。なお、第2射出成形部32は、図示を省略する射出コア型を備えていてもよい。
温度調整部33は、第2射出成形部32から搬送されるプリフォーム20の均温化や偏温除去を行い、プリフォーム20の温度を最終ブローに適した温度(例えば約90℃~105℃)に調整する。また、温度調整部33は、射出成形後の高温状態のプリフォーム20を冷却する機能も担う。
ブロー成形部34は、温度調整部33で温度調整されたプリフォーム20に対してブロー成形を行い、容器10を製造する。
ブロー成形部34は、容器10の形状に対応した一対の割型であるブローキャビティ型と、底型と、延伸ロッドおよびエア導入部材(いずれも不図示)を備える。ブロー成形部34は、プリフォーム20を延伸しながらブロー成形する。これにより、プリフォーム20がブローキャビティ型の形状に賦形されて容器10を製造することができる。
取り出し部35は、ブロー成形部34で製造された容器10の首部12をネック型から開放し、容器10をブロー成形装置30の外部へ取り出すように構成されている。
次に、第1実施形態のブロー成形装置30による容器の製造方法について説明する。図6は、容器の製造方法の工程を示すフローチャートである。
まず、第1射出成形部31において、射出キャビティ型、射出コア型および搬送機構36のネック型で形成された中間成形体20Aの型空間に第1射出装置37から樹脂材料を射出し、プリフォーム20の第1層24に相当する中間成形体20Aが製造される。
続いて、第2射出成形部32において、射出キャビティ型の内部に中間成形体20Aを収容した後、中間成形体20Aの外周と射出キャビティ型の間に第2射出装置38から樹脂材料が射出される。これにより、中間成形体20Aの外周部に第2層25が形成され、プリフォーム20が製造される。
続いて、温度調整部33において、プリフォーム20の温度を最終ブローに適した温度に近づけるための温度調整が行われる。
温度調整部33では、プリフォーム20が加熱ポット41および温度調整ポット42に配置(収容)され、プリフォーム20内には温度調整ロッド43が挿入される。その後、温度調整ロッド43がプリフォーム20を温度調整ポット42に向けて押圧し、プリフォーム20の底部22は温度調整ポット42に押し当てられた状態となる。
続いて、ブロー成形部34において、容器10のブロー成形が行われる。
まず、ブローキャビティ型および底型を型閉じしてプリフォーム20を型空間に収容し、エア導入部材(ブローコア)を下降させることで、プリフォーム20の首部23にエア導入部材が当接される。そして、延伸ロッドを降下させてプリフォーム20の底部22を内面から抑えて、必要に応じて縦軸延伸を行いつつ、エア導入部材からブローエアを供給することで、プリフォーム20を横軸延伸する。これにより、プリフォーム20は、ブローキャビティ型の型空間に密着するように膨出して賦形され、容器10にブロー成形される。なお、プリフォーム20が容器10より長い場合、底型は、ブローキャビティ型の型閉じ前はプリフォーム20の底部22と接触しない下方の位置で待機させ、型閉じ後に成形位置まで素早く上昇させる。
ブロー成形が終了すると、ブローキャビティ型が型開きされる。これにより、ブロー成形部34から容器10が移動可能となる。
続いて、搬送機構36の回転板が所定角度回転し、容器10が取り出し部35に搬送される。取り出し部35において、容器10の首部12がネック型から開放され、容器10がブロー成形装置30の外部へ取り出される。
また、第1層24と第2層25とで色彩や模様のパターンを変化させて容器10の意匠性を向上させてもよい。また、第1層24と第2層25で屈折率に差を生じさせて、第1層24と第2層25の界面で内部反射による光の散乱が生じるようにしてもよい。
以下、比較例と対比しつつ、本発明の実施例を説明する。
実施例では、上記実施形態と同様に、第1射出成形工程で第1層に相当するプリフォームの中間成形体を形成し、第2射出成形工程で中間成形体の外周に第2層を射出成形して二層構造のプリフォームを得た。実施例のプリフォームの縦断面形状は図3(a)と同様である。一方、比較例では、1回の射出成形工程で、図7に示す肉厚のプリフォーム20Bを射出成形した。なお、実施例のプリフォーム20の第1層24および第2層25は同じ材料、具体的には、ベルポリプロダクト株式会社製のPET樹脂(IP252BB1またはPIFG30)を用いて成形した。
一方、比較例の射出成形工程の射出時間は40秒であり、当該射出成形工程での冷却時間は7秒であった。また、比較例の射出成形工程におけるPET樹脂の射出重量は、57グラムであった。
第2実施形態は、第1実施形態の変形例であって、軸方向に延びる複数の溝が容器胴部の外周面に形成された容器の構成例を示している。以下の第2実施形態の説明では、第1実施形態と同様の要素には同一符号を付し、重複説明はいずれも省略する。
図8(a)、(b)に示す容器100は、第1実施形態の容器10と同様に、容器内面に臨む第1層24と容器外面に臨む第2層25が積層された構造を有する樹脂製容器であって、例えば、化粧水や乳液等が収容される。
また、プリフォーム200は、内周側に位置する第1層24と、外周側に位置する第2層25とが積層された構造を有している。首部23は第1層24の材料で構成されるが、胴部21および底部22においては、第1層24の外周に第2層25が積層されて構成されている。
また、第1射出成形部31で第1層24(内層)を射出金型から離型するときの離型温度は、第2射出成形部32で第2層25(外層)を射出金型から離型するときの離型温度よりも低く設定してもよい。
Claims (10)
- 有底筒状の樹脂製の中間成形体を射出成形する第1射出成形工程と、
前記中間成形体の外側に樹脂材料を射出成形し、前記中間成形体の外周側に樹脂層が積層された多層のプリフォームを製造する第2射出成形工程と、
前記プリフォームをブロー成形して、厚肉部を有する樹脂製容器を製造するブロー成形工程と、
を有する樹脂製容器の製造方法。 - 前記樹脂製容器は、容器胴部の肉厚よりも容器底部の肉厚が厚い
請求項1に記載の樹脂製容器の製造方法。 - 前記プリフォームの内周側の第1層の材料と外周側の第2層の材料の組成が異なる
請求項1または請求項2に記載の樹脂製容器の製造方法。 - 前記ブロー成形の前に、前記第2射出成形工程で製造された前記プリフォームの温度調整を行う温度調整工程をさらに有し、
前記温度調整工程において前記プリフォームの少なくとも底部が局所的に冷却される
請求項1から請求項3のいずれか一項に記載の樹脂製容器の製造方法。 - 前記温度調整工程では、前記プリフォームの胴部に臨む第1金型よりも低い温度に調整された第2の金型に前記プリフォームの底部を接触させて、前記プリフォームの底部が冷却される
請求項4に記載の樹脂製容器の製造方法。 - 前記第2射出成形工程において、それぞれ軸方向に延びる凸部と溝が周方向に交互に並ぶ前記樹脂層を、前記中間成形体の外周側に形成した溝付きプリフォームを製造し、
前記ブロー成形工程において、前記溝付きプリフォームをブロー成形して、軸方向に延びる溝を容器胴部の外周面に複数有する樹脂製容器を製造する
請求項1から請求項5のいずれか一項に記載の樹脂製容器の製造方法。 - 前記ブロー成形工程において、前記溝付きプリフォームの前記凸部をブロー金型の凹部に対向させて前記ブロー成形を行う
請求項6に記載の樹脂製容器の製造方法。 - 前記溝付きプリフォームの前記凸部の角度は、前記ブロー金型の前記凹部の開き角よりも小さい
請求項7に記載の樹脂製容器の製造方法。 - 前記溝付きプリフォームを前記ブロー金型に配置したときに、前記溝付きプリフォームの前記凸部と前記ブロー金型の凹部との径方向の第1間隔は、前記溝付きプリフォームの前記溝と前記ブロー金型との径方向の第2間隔よりも小さい
請求項7または請求項8に記載の樹脂製容器の製造方法。 - 有底筒状の樹脂製の中間成形体を射出成形する第1射出成形部と、
前記中間成形体の外側に樹脂材料を射出成形し、前記中間成形体の外周側に樹脂層が積層された多層のプリフォームを製造する第2射出成形部と、
前記プリフォームをブロー成形して、厚肉部を有する樹脂製容器を製造するブロー成形部と、
を備える樹脂製容器の製造装置。
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- 2020-11-25 US US17/779,190 patent/US20220402189A1/en active Pending
- 2020-11-25 EP EP20893618.7A patent/EP4067043A4/en active Pending
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US20220402189A1 (en) | 2022-12-22 |
KR20220108074A (ko) | 2022-08-02 |
CN114901453B (zh) | 2024-01-30 |
EP4067043A4 (en) | 2023-11-22 |
JPWO2021106929A1 (ja) | 2021-06-03 |
JP7437414B2 (ja) | 2024-02-22 |
EP4067043A1 (en) | 2022-10-05 |
CN114901453A (zh) | 2022-08-12 |
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