JP2002127237A - Blow molding method - Google Patents

Blow molding method

Info

Publication number
JP2002127237A
JP2002127237A JP2000328234A JP2000328234A JP2002127237A JP 2002127237 A JP2002127237 A JP 2002127237A JP 2000328234 A JP2000328234 A JP 2000328234A JP 2000328234 A JP2000328234 A JP 2000328234A JP 2002127237 A JP2002127237 A JP 2002127237A
Authority
JP
Japan
Prior art keywords
mold
blow
blow molding
bottom mold
container
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.)
Pending
Application number
JP2000328234A
Other languages
Japanese (ja)
Inventor
Hidehiko Fukai
秀彦 深井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Frontier Co Ltd
Original Assignee
Frontier Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Frontier Co Ltd filed Critical Frontier Co Ltd
Priority to JP2000328234A priority Critical patent/JP2002127237A/en
Publication of JP2002127237A publication Critical patent/JP2002127237A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C2049/4879—Moulds characterised by mould configurations
    • B29C2049/4892—Mould halves consisting of an independent main and bottom part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/56—Opening, closing or clamping means
    • B29C49/5612—Opening, closing or clamping means characterised by bottom part movement

Abstract

PROBLEM TO BE SOLVED: To achieve the miniaturization of the support mechanism of a bottom mold and the simplification of a structure in a blow molding method for forming a flat bottom by blow molding and subsequently pushing up a bottom mold to mold the flat bottom so as to form a bottom part having an upwardly protruded shape. SOLUTION: When left and right blow molds 5 and 6 are closed, a bottom mold holding plate 9 becomes a left and right held state by the holding plate holding parts 11 and 12 formed to the lower ends of the molds. Since a bottom mold block 10 is supported by left and right blow molds 5 and 6 when a bottom mold block 10 is supported by container bottom parts 5 and 6 when a container bottom part 2 is molded into a semispherical container bottom part 2 protruded upwardly by pushing up a bottom mold 7 after the blow molding of a perform 1, a large and strong support mechanism for supporting the bottom mold block 10 is dispensed with. Therefore, the miniaturization of a blow molding machine and the simplification of a structure can be achieved.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、炭酸飲料用のＰＥ
Ｔ容器等のように、内圧に耐えるように底部が上方に半
球状に***した形状の容器をブロー成形するためのブロ
ー成形方法に関するものである。[0001] The present invention relates to a PE for carbonated beverages.
The present invention relates to a blow molding method for blow molding a container such as a T container having a hemispherically upwardly raised bottom so as to withstand internal pressure.

【０００２】[0002]

【従来の技術】炭酸飲料等が充填されるＰＥＴ容器は、
充填物による内圧に耐えるために、その底部が上方に半
球状に***した、所謂シャンペン底形状とされる場合が
多い。このような底部を備えたＰＥＴ容器は次にように
ブロー成形されている。まず、ブロー金型の底型を最終
成形位置よりも降下した位置としておき、この状態でプ
リフォームをブロー成形する。この結果、底部以外は容
器の最終形状と同一形状に成形され、容器底部はほぼ平
坦に近い平底状態にブロー成形される。次に、ブロー状
態を保持したまま、底型を押し上げて、平底部分を上方
に***したシャンペン底となるように成形する。2. Description of the Related Art PET containers filled with carbonated beverages and the like are:
In order to withstand the internal pressure caused by the filler, the bottom is often formed in a so-called champagne bottom shape in which the bottom is raised in a hemispherical shape upward. A PET container with such a bottom is blow molded as follows. First, the bottom mold of the blow mold is set at a position lower than the final molding position, and the preform is blow-molded in this state. As a result, except for the bottom, the container is formed in the same shape as the final shape of the container, and the bottom of the container is blow-molded into a substantially flat flat bottom state. Next, while keeping the blow state, the bottom mold is pushed up, and the flat bottom portion is formed so as to become a champagne bottom protruding upward.

【０００３】[0003]

【発明が解決しようとする課題】ここで、底型を押し上
げるためには、大きな押し上げ力が必要となるので、大
型のシリンダ等の昇降機構が用いられている。このた
め、大きな押し上げ力に伴う反力を受け持つことができ
るように、昇降機構を支持するための大掛かりで頑丈な
昇降機構の支持機構を設置しておく必要がある。従っ
て、底型の支持機構が大掛かりとなり、シャンペン底を
備えた容器のブロー成形機の小型化、その構造の簡素化
の障害となっている。Here, in order to push up the bottom die, a large pushing force is required, so that a lifting mechanism such as a large cylinder is used. For this reason, it is necessary to provide a large and sturdy support mechanism of the lifting mechanism for supporting the lifting mechanism so as to be able to handle the reaction force accompanying the large lifting force. Therefore, the size of the bottom-type support mechanism becomes large, which hinders the downsizing and simplification of the structure of the blow molding machine for the container having the champagne bottom.

【０００４】本発明の課題は、この点に鑑みて、底型の
支持機構部分の小型化、構造の簡素化を達成可能なブロ
ー成形方法を提案することにある。[0004] In view of the above, an object of the present invention is to propose a blow molding method capable of achieving a reduction in the size of the support mechanism of the bottom mold and a simplification of the structure.

【０００５】[0005]

【課題を解決するための手段】上記の課題を解決するた
めに、本発明は、底部が上方に***した形状の容器をブ
ロー成形するブロー成形方法において：型締めされた状
態で底型が昇降可能となっているブロー金型内で、底型
を降下位置に保持した状態でプリフォームをブロー成形
するブロー成形工程と；ブロー成形工程に連続して、底
型を上昇位置まで押し上げて、ブロー成形された容器の
底部を上方に***した形状となるように成形する底部成
形工程とを含み；この底部成形工程における前記底型を
押し上げる際に発生する反力を、左右のブロー金型に受
け持たせることを特徴としている。In order to solve the above-mentioned problems, the present invention relates to a blow molding method for blow molding a container having a shape in which a bottom is raised upward: a bottom mold is raised and lowered in a clamped state. A blow molding step in which the preform is blow-molded while the bottom mold is held at the lowered position in a blow mold that is possible; A bottom forming step of forming the bottom of the formed container into an upwardly raised shape; receiving a reaction force generated when the bottom mold is pushed up in the bottom forming step in the left and right blow molds. It is characterized by having.

【０００６】本発明のブロー成形方法では、左右のブロ
ー金型を、底型を押し上げるための昇降機構を支持する
ための支持機構として利用できるので、別途、頑丈で大
掛かりな支持機構を設置する必要がなく、その分、ブロ
ー成形機を小型化でき、また、その構造を簡素化でき
る。In the blow molding method of the present invention, since the left and right blow dies can be used as a support mechanism for supporting an elevating mechanism for pushing up the bottom mold, it is necessary to separately provide a sturdy and large-scale support mechanism. Therefore, the blow molding machine can be downsized and the structure thereof can be simplified.

【０００７】ここで、左右のブロー金型によって底型を
支持するためには、前記底型を昇降可能に保持している
底型保持板を、型締め状態の左右のブロー金型によって
挟持するようにすればよい。Here, in order to support the bottom mold by the left and right blow molds, the bottom mold holding plate which holds the bottom mold so as to be able to move up and down is sandwiched between the left and right blow molds in a clamped state. What should I do?

【０００８】[0008]

【発明の実施の形態】以下に、図面を参照して、本発明
のブロー成形法の一例を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the blow molding method of the present invention will be described below with reference to the drawings.

【０００９】図１は本例のブロー成形法を説明するため
の説明図である。本例のブロー成形法は、図１（ｄ）に
示すように、底部２が上方に向けて半球状に***した形
状のＰＥＴ容器１をブロー成形するためのものである。
ブロー成形機全体の構成は、一般的に使用されているも
のと同様であるので、本発明の特徴部分のみを図面に基
づき説明し、その他の部分の説明は省略するものとす
る。FIG. 1 is an explanatory diagram for explaining the blow molding method of the present embodiment. The blow molding method of the present embodiment is for blow molding a PET container 1 having a shape in which a bottom portion 2 is hemispherically raised upward as shown in FIG.
Since the configuration of the entire blow molding machine is the same as that generally used, only the characteristic portions of the present invention will be described with reference to the drawings, and the description of the other portions will be omitted.

【００１０】まず、図１（ａ）に示すようにブロー成形
に適した加熱状態のプリフォーム３を用意し、これを、
図１（ｂ）に示すように型開き状態にあるブロー金型機
構４内に配置する。ブロー金型機構４は、左右のブロー
金型５、６と、底型７とを備えている。左右のブロー金
型５、６は、不図示の駆動機構によって型開き位置と型
締め位置の間を水平に移動可能である。底型７は、昇降
シリンダ８に支持されており、昇降シリンダ８は底型保
持板９によって支持されている。底型保持板９は軽微な
支持機構（図示せず）によって支持されている。First, a preform 3 in a heated state suitable for blow molding is prepared as shown in FIG.
As shown in FIG. 1B, it is arranged in the blow mold mechanism 4 in the mold open state. The blow mold mechanism 4 includes left and right blow molds 5 and 6 and a bottom mold 7. The left and right blow molds 5 and 6 can be moved horizontally between a mold opening position and a mold clamping position by a drive mechanism (not shown). The bottom mold 7 is supported by a lifting cylinder 8, and the lifting cylinder 8 is supported by a bottom holding plate 9. The bottom mold holding plate 9 is supported by a small support mechanism (not shown).

【００１１】ここで、左右のブロー金型５、６は、その
下端部分が底型７よりも下方に延びており、その下端に
は、相互に対峙する位置に、保持板挟持部１１、１２が
形成されている。The left and right blow molds 5 and 6 have lower end portions extending below the bottom mold 7, and have lower end portions at which the holding plate holding portions 11 and 12 face each other. Are formed.

【００１２】図１（ｃ）に示すように、左右のブロー金
型５、６を閉じると、それらの下端の保持板挟持部１
１、１２によって、両側から底板保持部９が挟持された
状態になる。この状態で、プリフォーム１のブロー成形
が行われる。このブロー成形工程では、底型７はその降
下位置にあり、僅かに金型内部に突出しているのみなの
で、容器底部は平底状態にブロー成形される。図２
（ａ）には容器底部のブロー成形状態を示してある。As shown in FIG. 1C, when the left and right blow molds 5 and 6 are closed, the holding plate holding portions 1 at their lower ends are closed.
The bottom plate holding portion 9 is sandwiched from both sides by 1 and 12. In this state, the blow molding of the preform 1 is performed. In this blow molding step, the bottom mold 7 is at the lowered position and only slightly protrudes into the mold, so that the container bottom is blow molded to a flat bottom state. FIG.
(A) shows the blow molding state of the container bottom.

【００１３】次に、図１（ｄ）に示すように、ブロー状
態を保持したまま（例えば、４０気圧程度の内圧を加え
たまま）、底型７を昇降シリンダ８によってその上昇位
置まで押し上げる（例えば、十数ｍｍ押し上げる）。底
型７を押し上げることにより、容器底部は上方に***し
た半球状に成形される。図２（ｂ）にはこの底部を拡大
して示してある。この図に示すように、平底部分を底型
７で押し上げると、底部の糸じり部分２ａが肉厚となり
耐圧性能が高まる。Next, as shown in FIG. 1D, while the blow state is maintained (for example, an internal pressure of about 40 atm is applied), the bottom mold 7 is pushed up to its raised position by the lifting cylinder 8 ( For example, push up by more than ten mm). By pushing up the bottom mold 7, the container bottom is formed into a hemispherical shape that is raised upward. FIG. 2B shows the bottom portion in an enlarged manner. As shown in this figure, when the flat bottom portion is pushed up by the bottom mold 7, the thread binding portion 2a at the bottom becomes thicker, and the pressure resistance performance is improved.

【００１４】ここで、底型７の押し上げ時には一般に
１，０００ｋｇ程度の力が必要とされる。そのために昇
降シリンダ８も大型のものが用いられ、これを支持する
ための支持機構も大掛かりなものとなる。しかしなが
ら、本例では、型締め状態においては、左右のブロー金
型５、６によって底型保持板９が挟持され、これら金型
５、６によって底型押し上げ時に発生する大きな反力を
受けるようになっている。このために、底型７、昇降シ
リンダ８および底板保持板９からなる底型ブロック１０
を支持するための支持機構として大掛かりで頑丈なもの
を設置する必要がない。Here, when the bottom mold 7 is pushed up, a force of about 1,000 kg is generally required. For this purpose, a large lifting cylinder 8 is used, and a large supporting mechanism for supporting the lifting cylinder 8 is required. However, in this example, in the mold clamping state, the bottom mold holding plate 9 is sandwiched by the left and right blow molds 5 and 6 so that the molds 5 and 6 receive a large reaction force generated when the bottom mold is pushed up. Has become. For this purpose, a bottom mold block 10 composed of a bottom mold 7, a lifting cylinder 8 and a bottom plate holding plate 9 is provided.
There is no need to install a large and sturdy support mechanism for supporting the hologram.

【００１５】この後は、図１（ｅ）に示すように、型を
開き、成形後のＰＥＴ容器１が取り出される。Thereafter, as shown in FIG. 1E, the mold is opened, and the molded PET container 1 is taken out.

【００１６】なお、本発明のブロー成形方法は、例え
ば、図３に示すような形状をしたＰＥＴ製のラムネ瓶の
ブロー成形にも用いることができる。また、底部が上方
に***しているテニスボール缶やその他の容器の製造に
も用いることができることは勿論である。The blow molding method of the present invention can be used, for example, for blow molding a PET ramune bottle having a shape as shown in FIG. Of course, it can also be used to manufacture tennis ball cans and other containers whose bottoms are raised upward.

【００１７】[0017]

【発明の効果】以上説明したように、本発明のブロー成
形法では、型締め状態において底型を押し上げる際に発
生する反力を左右のブロー金型によって受け持たせるよ
うにしている。従って、底型押し上げ時に発生する大き
な反力を受け持つための大掛かりで頑丈な支持機構が不
要となる。よって、その分、ブロー成形機の小型化、醸
造の簡素化を実現できる。As described above, in the blow molding method of the present invention, the reaction force generated when the bottom mold is pushed up in the clamped state is taken up by the left and right blow molds. Therefore, there is no need for a large and sturdy support mechanism for handling a large reaction force generated when the bottom die is pushed up. Therefore, the size of the blow molding machine can be reduced and the brewing can be simplified.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明のブロー成形法の手順を示す説明図であ
る。FIG. 1 is an explanatory view showing a procedure of a blow molding method of the present invention.

【図２】容器底部の成形手順を示す説明図である。FIG. 2 is an explanatory view showing a procedure for forming a container bottom.

【図３】（ａ）ないし（ｆ）は、本発明のブロー成形法
により成形されたＰＥＴ製ラムネ瓶を示す正面図、側面
図、底面図、ｄ−ｄ線断面図、およびｅ−ｅ線断面図で
ある。FIGS. 3 (a) to 3 (f) are a front view, a side view, a bottom view, a dd line sectional view, and an ee line showing a PET ramune bottle formed by the blow molding method of the present invention. It is sectional drawing.

【符号の説明】[Explanation of symbols]

１ ＰＥＴ容器 ２ 容器底部 ３ プリフォーム ４ ブロー金型機構 ５、６ 左右のブロー金型 ７ 底型 ８ 昇降シリンダ ９ 底型保持板 １０ 底型ブロック １１、１２ 保持板挟持部 DESCRIPTION OF SYMBOLS 1 PET container 2 Container bottom part 3 Preform 4 Blow mold mechanism 5, 6 Left and right blow mold 7 Bottom mold 8 Elevating cylinder 9 Bottom mold holding plate 10 Bottom mold block 11, 12 Holding plate holding part

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 底部が上方に***した形状の容器をブロ
ー成形するブロー成形方法において、 型締めされた状態で底型が昇降可能となっているブロー
金型内で、底型を降下位置に保持してプリフォームをブ
ロー成形するブロー成形工程と、 底型を上昇位置まで押し上げて、ブロー成形された容器
の底部を上方に***した形状となるように成形する底部
成形工程とを含み、 この底部成形工程における前記底型を押し上げる際に発
生する反力を、左右のブロー金型に受け持たせることを
特徴とするブロー成形方法。In a blow molding method for blow molding a container having a shape in which a bottom is raised upward, a bottom mold is moved to a lowered position in a blow mold in which a bottom mold can be moved up and down in a clamped state. A blow molding step of holding and blow molding the preform, and a bottom molding step of pushing up a bottom mold to an ascending position and molding the bottom of the blow molded container so as to have an upwardly raised shape. A blow molding method, wherein the reaction force generated when the bottom mold is pushed up in the bottom molding step is imparted to the left and right blow molds. 【請求項２】 請求項１において、 前記底型を昇降可能に保持している底型保持板を、型締
め状態の左右のブロー金型によって挟持することを特徴
とするブロー成形方法。2. The blow molding method according to claim 1, wherein the bottom mold holding plate that holds the bottom mold so as to be able to move up and down is sandwiched between left and right blow molds in a mold-clamped state.
JP2000328234A 2000-10-27 2000-10-27 Blow molding method Pending JP2002127237A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000328234A JP2002127237A (en) 2000-10-27 2000-10-27 Blow molding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000328234A JP2002127237A (en) 2000-10-27 2000-10-27 Blow molding method

Publications (1)

Publication Number Publication Date
JP2002127237A true JP2002127237A (en) 2002-05-08

Family

ID=18805113

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000328234A Pending JP2002127237A (en) 2000-10-27 2000-10-27 Blow molding method

Country Status (1)

Country Link
JP (1) JP2002127237A (en)

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KR200455535Y1 (en) 2011-06-22 2011-09-14 삼안산업 주식회사 Printing Keyhole Forming Device for Bottom of Container
JP2011218722A (en) * 2010-04-13 2011-11-04 Hokkai Can Co Ltd Blow-molding method for bottle made of synthetic resin
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US8152010B2 (en) 2002-09-30 2012-04-10 Co2 Pac Limited Container structure for removal of vacuum pressure
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US8627944B2 (en) 2008-07-23 2014-01-14 Graham Packaging Company L.P. System, apparatus, and method for conveying a plurality of containers
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WO2014167235A1 (en) * 2013-04-12 2014-10-16 Sidel Participations Mold having an offset parting line for manufacturing containers having increased stability
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