JPH039831A - Manufacture of blow molded container - Google Patents
Manufacture of blow molded containerInfo
- Publication number
- JPH039831A JPH039831A JP1142132A JP14213289A JPH039831A JP H039831 A JPH039831 A JP H039831A JP 1142132 A JP1142132 A JP 1142132A JP 14213289 A JP14213289 A JP 14213289A JP H039831 A JPH039831 A JP H039831A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- container
- cooling medium
- time
- molded 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000002826 coolant Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000000071 blow moulding Methods 0.000 claims description 16
- 238000000465 moulding Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 12
- 229920006230 thermoplastic polyester resin Polymers 0.000 claims description 2
- 238000007664 blowing Methods 0.000 abstract description 19
- 238000010438 heat treatment Methods 0.000 abstract description 14
- 238000007599 discharging Methods 0.000 abstract 2
- 230000000052 comparative effect Effects 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 229920000139 polyethylene terephthalate Polymers 0.000 description 6
- 239000005020 polyethylene terephthalate Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 210000002784 stomach Anatomy 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- B29C49/78—Measuring, controlling or regulating
- B29C49/783—Measuring, controlling or regulating blowing pressure
-
- 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
- B29C49/78—Measuring, controlling or regulating
- B29C49/783—Measuring, controlling or regulating blowing pressure
- B29C2049/7832—Blowing with two or more pressure levels
-
- 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
-
- 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
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は熱可塑性ポリエステル０４脂からなるプリフ
ォームからプローｌ＆形によってポリエステル樹ｍｔｓ
器を製造する方法の改良に係わるものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) This invention is a method of processing polyester resin mts by protruding and shaping a preform made of thermoplastic polyester 04 resin.
This relates to improvements in the method of manufacturing vessels.
（従来の技術）
ポリエチレンテレフタレート樹脂のような熱可ｆｆ２性
ポリエステルＩ（脂を素材とし、このものから二軸延伸
ブロー成形によって得られろ容器は、透明性、強度、衛
生面などにＩＳいて優れているので各種用途に広く用い
られているが、高温にさらすと熱収縮をおこすという難
点があり、この難点を解消し、容器の耐熱性、寸法安定
性を高めるため、ブロー成形した容器を高温で熱処Ｊ￥
！（熱固定）すること、例えば、ブロー成形時の金型を
熱処理に適する高・温度に保持しておき、ブローによっ
てこの金型に接した容器壁面を加熱して熱固定をはかる
方法が知られている。しかしながら、その成形容器を金
型から取出すときは収縮変形を起すので、この不都合を
なくすため、成形容器内に冷却媒体を供給する方法、例
えば液化炭酸〃ス或いは水滴入りの空気を噴入するとか
、又は低温例えば常温の空５気を吹込むとかして、成形
容器を冷却固定する方法が提案されている。(Prior art) Containers made from thermoplastic FF2 polyester I (fat) such as polyethylene terephthalate resin by biaxial stretch blow molding are excellent in terms of transparency, strength, hygiene, etc. However, in order to solve this problem and improve the heat resistance and dimensional stability of the container, blow-molded containers are heated to high temperatures. Heat treatment J￥
! For example, a method is known in which the mold for blow molding is maintained at a high temperature suitable for heat treatment, and the wall surface of the container that is in contact with the mold is heated by blowing to achieve heat fixation. ing. However, when the molded container is removed from the mold, it shrinks and deforms, so in order to eliminate this inconvenience, a method of supplying a cooling medium into the molded container, such as injecting liquefied carbon dioxide or air containing water droplets, is recommended. Alternatively, a method has been proposed in which the molded container is cooled and fixed by blowing air at a low temperature, for example, room temperature.
（発明が解決しようとする課題）
しかしながら、１−記のように冷却媒体を成形容器内に
噴出させる際、成形容器は高温に保持された金型壁に密
着しているので、成形容器の冷却効率が悪く、変形を起
すことなく、ブロー成形容器を取出すことは困難である
。また、変形を起すことなく容器を取出すためには、冷
却に要する時間が長くなってしまい、冷却媒体の使用蓋
が多くなってしまったりして、成形サイクルが伸びるこ
とになり、商業的な生産には不向さという問題がある。(Problem to be Solved by the Invention) However, when the cooling medium is injected into the molded container as described in 1-, the molded container is in close contact with the mold wall kept at a high temperature, so the molded container is cooled. It is difficult to remove the blow molded container without inefficiency and deformation. In addition, in order to remove the container without deformation, it takes a long time to cool the container, which means more lids are used for the cooling medium, which lengthens the molding cycle and makes commercial production difficult. There is a problem of unsuitability.
（課題を解決するための手段）
本発明者は、熱処理後の冷却媒体噴出による成形容器の
冷却効率が悪いのは、冷却と型開きのタイミングが適切
でないことによるものであるとの知見を得、種々ｉｆｆ
究を重ねて本発明を完成した。(Means for Solving the Problems) The present inventor has obtained the knowledge that the poor cooling efficiency of the molded container due to the jetting of cooling medium after heat treatment is due to the timing of cooling and mold opening being inappropriate. , various if
After repeated research, the present invention was completed.
即ち、本発明は、二軸延伸ブロー成形によって熱可塑性
ポリエステル樹脂例えばポリエチレンテレフタレート（
以下、ＰＥＴと略称する）からなる容器を製造するに当
り、ブロー成形金型を高温に保持しておいて、これでも
ってブロー成形された容器を熱処理し、この成形容器の
内部に冷却媒体を噴出させて成形容器を冷却固定する方
法において、上記の冷却媒体を噴出させながら成形金型
の型開きを開始することを特徴とする方法である。That is, the present invention produces thermoplastic polyester resins, such as polyethylene terephthalate, by biaxial stretch blow molding.
When manufacturing a container made of PET (hereinafter abbreviated as PET), a blow molding mold is kept at a high temperature, and the blow molded container is heat treated with the blow molding mold, and a cooling medium is introduced into the inside of the molded container. A method for cooling and fixing a molded container by jetting the cooling medium, which is characterized by starting to open the molding die while spouting the cooling medium.
以下、本発明の詳細な説明する。The present invention will be explained in detail below.
本発明は、−１−記のようにポリエステル樹脂、特に好
ましくはＰＥＴからなるプリフォームを出発材料とし、
これをブロー成形装置によってブロー成形し、かつ成形
金型を成形容器の熱処理に適する高温に保持しておいて
成形容器を熱処理し、しかる後成形１′Ｉ：器を冷却媒
体で冷却する方法における冷Ｊ」媒体による成形容器の
冷却および型開きの時期を特定化したものであり、従っ
て成形容器を成形金型で熱処理するまでの処理は従来法
に準じて行えばよい。そして本発明方法では、熱処理後
の冷却媒体による冷却および型開さを、本発明に規定す
るタイミングで行なうものであって、これを第１図で説
明する。The present invention uses a preform made of polyester resin, particularly preferably PET, as a starting material, as described in -1-,
This is blow molded using a blow molding device, and the molded mold is maintained at a high temperature suitable for heat treatment of the molded container, and the molded container is heat treated, and then molded 1'I: In the method of cooling the container with a cooling medium. The timing of cooling the molded container with the "Cold J" medium and opening the mold is specified, and therefore, the processing up to the heat treatment of the molded container with the molding die can be carried out according to conventional methods. In the method of the present invention, cooling with a cooling medium and opening of the mold after heat treatment are performed at the timing prescribed in the present invention, and this will be explained with reference to FIG.
第１図はブロー成形における各工程の時間的関係を例示
する図表（タイムチャート）であり、図中、Ａは成形金
型にプリフォームが装着され、金型かけ１しられる時期
を指し、点＆Ｑｔの時点で金型は閉ざされる。そしてブ
ロー成形が終り、金型が開かれるときをＢで示しである
１点線−はこの型開きの開始時点を指す。Ｃは延伸ロッ
ドが突出され、突出状態が保持されている時期を指す。Figure 1 is a diagram (time chart) illustrating the temporal relationship of each process in blow molding. The mold is closed at &Qt. When the blow molding is finished and the mold is opened, the one-dot line indicated by B indicates the start point of the mold opening. C refers to the period when the stretching rod is protruded and the protruding state is maintained.
本ｒト発明方法の場合、成形容器内への冷却媒体の噴出
は、型開き開始後の時期を含んでいるので、Ｃの時間も
噛で示される型開きの時、α後まで続いている。その時
開を１゜とする。なお、このし。、さらにこれにっづ＜
ｉｔ、ｔ２、・・・・Ｌ７は以下の説明、更に後述
の実施例、比較例における、それぞれの工程の時間を示
す説明で、時間の長短及び時期の相互関係を表示するも
のである。In the case of the method of the present invention, the injection of the cooling medium into the molding container includes the time after the start of mold opening, so the time C also continues until after α when the mold opens, which is indicated by the arrow. . At that time, the opening is set to 1°. In addition, this. , moreover this is <
it, t2, . . . L7 is an explanation indicating the time of each step in the following explanation, and further in Examples and Comparative Examples to be described later, and indicates the correlation between the length of time and the timing.
型閉じしてＥ、の時開が経過した後、ｔｐＪ１次のブロ
ー〇が始まり、これはＬ２の時間続さ、また型閉じして
ｔ、の時間後、第２次のブローＥが始まり、これはｔ、
の時間続く。第１次のブローＤはプリ７す−ムを概略の
成形容器形状まで膨らませ（圧力は例えば１０ ヘ、７
１５ ｋｇ／ ０ｍ２）、第２次のブローＥでは圧力を
高め（例えば３０”−６０ｋｇ／６１１’）、容器の外
表面の細部まで成形する。上記ブローでは金型に密接し
た容器が熱処理を受けるので、この熱処理の時開も、ブ
ローの時間に含まれている。この熱処理も含まれるブロ
ーの操作が終れば、成形′σ容器内高圧を排気しながら
冷却媒体の噴出Ｆを行う。After closing the mold and opening time E, tpJ1st blow 〇 starts, which lasts for time L2, and after closing the mold and time t, the second blow E starts, This is t,
Lasts for an hour. The first blow D inflates the preform to the approximate shape of the molded container (the pressure is, for example, 10°, 7°
15 kg/0m2), and in the second blow E, the pressure is increased (e.g. 30"-60 kg/611') to mold even the details of the outer surface of the container. In the above blow, the container in close contact with the mold is subjected to heat treatment. Therefore, the opening of this heat treatment is also included in the blowing time.When the blowing operation including this heat treatment is completed, the cooling medium is jetted F while exhausting the high pressure inside the molding container.
第１図においては、点線１１で示す時点を、ブロー終了
時とし、併せて成形′容器がらの排気を開始する時点と
して表示しているが、実際には、排気開始後も、成形′
Ｃ〆２；内には内圧がががっており、この内圧のかかっ
ている期間は熱固定等の作用が続けられる。In FIG. 1, the point indicated by the dotted line 11 is the end of blowing and also the point at which the evacuation of the molding container begins, but in reality, even after the evacuation has started, the molding container continues to flow.
There is a rise in internal pressure inside C2, and during the period when this internal pressure is applied, actions such as heat fixation continue.
冷却媒体の噴出開始は、成形容器からの排気が始まった
時点から行ない、第１図に示されるように、し、の時間
行なう。なお、第１図中、Ｇ及びＩＩは後述する比較例
の冷却工程、排気を示すもので冷却媒体の噴出にをＥ６
の時間行い、次で冷却媒体の噴出を１１−め、成形容器
内の圧力を大気圧まで戻す完全排気■１をＬ７の時間行
なうことを表わしている。The cooling medium is started to be ejected from the time when the evacuation from the molding container begins, and is carried out for a time period of , as shown in FIG. In Fig. 1, G and II indicate the cooling process and exhaust of a comparative example, which will be described later.
This indicates that the cooling medium is jetted out for a time of L7, and then the complete exhaust (1) for returning the pressure inside the molding container to atmospheric pressure is performed for a time of L7.
ｒｊＳ１図１：オイテ、Ｃ，［）、ＥＳＦ、Ｇ及１／Ｈ
相互の時間の長短関係は例示的なものであり、個々の操
作の時開が短くなったり、長くなったり又は重複したり
することがある。ただし、本発明方法ではＦで示される
冷却媒体の噴出中に型開！！Ｂを行なうことが必要であ
る。rjS1 Figure 1: Oite, C, [), ESF, G and 1/H
The relationship between the length of time and the shortness of time is exemplary, and the time periods of individual operations may become shorter, longer, or overlap. However, in the method of the present invention, the mold is opened during the spouting of the cooling medium indicated by F! ! It is necessary to do B.
次に、本発明方法の実施態様を添付図面の説明とｆＪｌ
せて詳説する。Next, embodiments of the method of the present invention will be described with reference to the accompanying drawings and fJl.
I will explain it in detail.
第２図は本発明方法を実施する装置の一例の縦断正面略
図であり、第３図は第２図と同じ装置の縦断正面略図を
示すが、第２図と第３図とは、本発明方法の実施態様を
異にする例をそれぞれ説明するためのものである。FIG. 2 is a schematic longitudinal sectional front view of an example of an apparatus for carrying out the method of the present invention, and FIG. 3 is a schematic longitudinal sectional front view of the same apparatus as in FIG. The figures are provided to illustrate different examples of the implementation of the method.
図中、１及び２は割へり横道からなるブロー成形用の金
型、３は同じく成型、４は金型１及び２を加熱するため
の加熱用媒体の通路、５は吹込ノズル、６は管状の延伸
ロッド、７は延伸ａγドロの中心を貢通している通路、
８は通路７がら液体を噴出したり又は通＆ｌ）７に流体
を流入したりｒるための延伸ロッド６に設けられた孔、
９は延伸ロッド６のａｍ７に連通する通路、１０は通路
９に設けられた電磁弁、１１は吹込ノズル５に設けられ
てぃろ、ブロー成形される容器に通ずる通路、１２は、
吹込ノズル５１こおいて、延伸ロッドの周囲に形成され
ている環状の通路であって、この通路１２は１−記の通
路１１とブロー成形される容器の内部をつないでいる。In the figure, 1 and 2 are molds for blow molding consisting of side channels, 3 is also a mold, 4 is a passage for heating medium to heat the molds 1 and 2, 5 is a blow nozzle, and 6 is a tubular shape. 7 is a passage passing through the center of the stretched aγ rod,
8 is a hole provided in the extending rod 6 for spouting out liquid from the passage 7 or allowing fluid to flow into the passage 7;
9 is a passage communicating with am7 of the stretching rod 6, 10 is a solenoid valve provided in the passage 9, 11 is a passage provided in the blow nozzle 5 and communicating with the container to be blow-molded, and 12 is
In the blowing nozzle 51, an annular passage is formed around the stretching rod, and this passage 12 connects the passage 11 of 1- with the inside of the container to be blow-molded.
１３は通路１１に連通する配管、１４は配管１３から分
かれている排気管、１５は排気Ｗ１４に設けられでいる
弁、１６及び１７は配管１３から分かれている分岐管、
１８及び１９は分岐管１６及び１７にそれぞれ設けＣ）
れている弁、２０はブロー成形された容器である。13 is a pipe communicating with the passage 11, 14 is an exhaust pipe separated from the pipe 13, 15 is a valve provided in the exhaust W 14, 16 and 17 are branch pipes separated from the pipe 13,
18 and 19 are provided in branch pipes 16 and 17, respectivelyC)
The valve shown at 20 is a blow molded container.
先ず第２図に示す装置で本発明方法を実施する例を説明
する。First, an example of implementing the method of the present invention using the apparatus shown in FIG. 2 will be described.
成形金型１．２は、加熱用媒体の通路４を通ろ加熱媒体
によって８０パ・７２５０℃、好ましくは９０・す１７
（１℃に加熱され、一方今型内に装填されるプリフォ
ームは樹脂のがラス転移温度以］−（例えばＰＥＴの場
合９Ｏ−ｕｌｌｏ℃）に加熱されて金型内に装填され、
型閉じされた後、プリフォーム内に延伸ロッド６を突出
させて縦方向の延伸を行い、更にプリフォーム内に加圧
気体を吹込む。The molding die 1.2 is heated to 80° C., preferably 90° C., by the heating medium through the heating medium passage 4.
(Heated to 1°C, while the preform to be loaded into the mold is heated to below the lath transition temperature of the resin] - (for example, 9O-ullo°C in the case of PET) and loaded into the mold,
After the mold is closed, a stretching rod 6 is projected into the preform to perform longitudinal stretching, and pressurized gas is further blown into the preform.
延伸ロッド６の伸張は、その先端が成型４こ達するまで
行なってもよいが、例えば、びん形の容器の場合、口栓
部から容器底部までの距離の約８割程度の長さから、容
２ユ底面に近接するまでの長さの範囲かＣ７選んでもよ
い。The stretching rod 6 may be stretched until its tip reaches the 4th point of the molding. For example, in the case of a bottle-shaped container, the length of the stretching rod 6 is approximately 80% of the distance from the spout to the bottom of the container. You may choose C7 within the length range up to the bottom of the 2 unit.
即ち延伸ロッドで容器を成型に到るまで縦延伸しなくと
も、高圧気体の吹込みで成型に達するまで安定してブロ
ー成形ができる。That is, even if the container is not longitudinally stretched using a stretching rod until it reaches the molding stage, blow molding can be stably performed until the molding stage is reached by blowing high-pressure gas into the container.
そして延伸ロッド６の突出程度を調節し、この延伸ロッ
ド６に設けられた孔８からの噴出冷却媒体流が容器の胴
下部付近に当たるようにするときは、成形容器の最も変
形し易い胴下部を優先的に冷却することができる。Then, when adjusting the degree of protrusion of the stretching rod 6 so that the jetting cooling medium flow from the hole 8 provided in the stretching rod 6 hits the vicinity of the lower part of the body of the container, the lower part of the body of the molded container is the most deformable part. It can be preferentially cooled.
プリフォーム内への加圧気体（通常、常温の空気）の吹
込みは、−１−、述のように比較的低圧（例えば１０
’＼７１５ ｋＨ／ ｃｍ’）の第１次ブローと、これ
より高圧にした（例えば３０ ヘ、（３０ｋｇ／ ｅｆ
ｉ” ）ｆｊＳ２次ブローとからなり、ｔｔＳｉ次ブロ
ーの高圧気体は分岐管１６からまた第２次ブローの高圧
気体は分岐管１７から、それぞれ、配管１３、通路１】
、通路・１２を経て成形される容器内へ吹込まれ、ブロ
ー成形が行なわれる。ブロー成形が終れば、弁１８．１
９を閉じ、弁１５を開くと、排気体１４から排気が行な
われる。成形容器内への冷却媒体の送給は、第２図に示
す例では、通路９から延伸ロッド６内の通路７に冷却媒
体を送り、延伸ロフト６に設けられた孔８から容器内部
へ噴出させる。第２図中、欠印ａは噴出冷力１媒体の噴
出方向を示すにの冷Ｊｊｌ媒体は通路１２、通路１１、
配管１３、排気管１４を経て排出される。なお、通路９
．１ｐびに分岐管１６及び１７には、それぞれ逆止弁９
１．１６１及び１７１が設けられており、圧空等の逆流
を防いでいる。Pressurized gas (usually air at room temperature) is blown into the preform at a relatively low pressure (e.g. 10
'＼715 kHz/cm') primary blow and higher pressure (e.g. 30 kg/ef, (30 kg/ef)
i") fjS secondary blow, the high pressure gas of ttSi secondary blow is sent from the branch pipe 16, and the high pressure gas of the secondary blow is sent from the branch pipe 17, respectively, through the piping 13 and the passage 1]
, through the passageway 12 into the container to be molded, and blow molding is performed. Once the blow molding is finished, the valve 18.1
When the valve 9 is closed and the valve 15 is opened, the exhaust body 14 is exhausted. In the example shown in FIG. 2, the cooling medium is fed into the molded container by sending the cooling medium from the passage 9 to the passage 7 in the stretching rod 6 and jetting it into the container from the hole 8 provided in the stretching loft 6. let In Fig. 2, the missing mark a indicates the direction of ejection of the ejected cooling force 1 medium.
It is discharged via piping 13 and exhaust pipe 14. In addition, aisle 9
．． 1p and branch pipes 16 and 17 are each provided with a check valve 9.
1.161 and 171 are provided to prevent backflow of compressed air, etc.
第３図に示すものは、通路９に逆１１−弁９１がない以
外は第２図に示すのと同じ装置を用い、冷却媒体の送給
経路を第２図に示す場合と異ならせた場合を示すもので
ある１、即も、延伸ロッド６の突出、第１次ブロー、第
２次ブロー、容器内の高圧気体の排気は、第２図につい
て説明したと同様に行なう、そして冷却媒体は第２ｔ２
１に示す場合とは逆に分岐ｆＦ１Ｇから（又は分岐管１
７から）配管１３、通路１１、通路１２を経て成形容器
内に送給される。この冷却媒体は第３図中、矢印１〕で
示すように流れて成形容器内壁を冷却し、延伸ロッド６
に設けられた孔８がら通路７、通路９を経て排出される
。この第３図に示されるような冷却媒体の供給力式は、
冷却媒体として比較的高い圧力の常温空気、例えばブロ
ー用の気体をそのよ）用いる場合に適する。この場合、
ブローの操作に用いていた気体を、その供給を＋ｈめず
に、９１行して排気を始めることが、とりもなおさず、
Ｐｔ５１図に示す冷却媒体の噴出Ｆの開始となる。The device shown in FIG. 3 uses the same device as shown in FIG. 2 except that there is no reverse 11-valve 91 in the passage 9, but the cooling medium feeding path is different from that shown in FIG. 2. 1. Immediately, the protrusion of the stretching rod 6, the first blow, the second blow, and the evacuation of the high-pressure gas in the container are performed in the same manner as explained in connection with FIG. 2, and the cooling medium is 2nd t2
Contrary to the case shown in 1, from branch fF1G (or from branch pipe 1
7) is fed into the molding container via piping 13, passage 11, and passage 12. This cooling medium flows as shown by arrow 1 in FIG. 3, cools the inner wall of the molding container, and
The water is discharged through the hole 8 provided in the hole 8 through the passage 7 and the passage 9. The cooling medium supply force equation as shown in Fig. 3 is:
It is suitable when relatively high pressure normal temperature air, such as blowing gas, is used as the cooling medium. in this case,
The first thing to do is to start exhausting the gas used for the blow operation in line 91 without stopping its supply by +h.
This is the start of the cooling medium jet F shown in the Pt51 diagram.
（実施例）
実施例トす３柑びに比較例１及び２
これらの実施例及び比較例ではｆｊＳ２図に示した装置
を用い、ＰｔＷＪ２図について説明した方法（特に冷却
媒体の供給方式は、第２図について説明した方法により
）に従った。(Example) Examples and Comparative Examples 1 and 2 In these Examples and Comparative Examples, the apparatus shown in Fig. fjS2 was used, and the method explained for Fig. PtWJ2 (especially the cooling medium supply method according to the method described for the figure).
この方法に従い、プリフォームの重電、金型の温度、冷
却媒体の種類、更に各工程における所要ｎ、’７開を種
々変えて行なった実施例１・＼２３並びに比較例１及び
２を後記ｆＰＪ１表に示す。このＰｔ５１表に！目する
［。・’ｋｙ Ｌ ｔの項目は、−［−記に説明した第
１図のタイムチャートにおけるＣ （Ｌ（１’）−Ｌ
Ｇ （ｔ８ ）、）Ｉ（ｔ、）に相当するものである。Following this method, Examples 1 and 23 and Comparative Examples 1 and 2 are described below, in which the preform's heavy electric current, mold temperature, type of cooling medium, and the required n and '7 openings in each process were varied. It is shown in the fPJ1 table. In this Pt51 table! I see [.・The item 'ky L t is -[C (L(1')-L
G(t8),)I(t,).
これら実施例及び比較例で得られた゛容器に−）いて、
その取出し時の置注容器（２０’Ｃの水にて測定した）
とその’Ｎ ’ｆｌの７しく１ｔ ＝ １０本で行った
゛け早、測定の標準偏差σｎ−１）及び熱湯光Ｊ直後の
変形を調べた。In the containers obtained in these Examples and Comparative Examples,
Pour container when taken out (measured with water at 20'C)
The standard deviation of measurement σn-1) and the deformation immediately after the boiling water light J were investigated using 1t = 10 pieces of 'N' fl.
第１人中冷冷却体のミス）・とは水滴含有空気のことで
ある。また、熱湯充填後の変形とは、成形容器に８７°
Ｃの熱水を規定散光填した１＆（例えば１ を用の容器
であればＩ Ｌ充填する）、蓋をし、横倒し状態で３０
秒、次いで直立状態に２分装置いた後、シャワー冷却し
、変形の有無を内服観察したものである。The error in the first person's cooling body) refers to air containing water droplets. Also, the deformation after filling with boiling water is 87° to the molded container.
Fill the container with C hot water with specified diffused light (for example, if it is a container for 1 liter, fill it with 1 L), cover it, and place it on its side for 30 minutes.
After being left in the upright position for 2 minutes, the device was cooled in the shower and observed for deformation.
なお、比較例１．２とも金型から取出した状態において
成形容器の胴部にｔ″Ｃに変形があった。In addition, in both Comparative Examples 1 and 2, there was deformation at t″C in the body of the molded container when it was removed from the mold.
実施例４及び比較例３
これらの実施例４及び比較例３では、Ｐｔ５３図につい
て説明した冷却媒体の供給方法に従ってブロー成形容器
を製造した。そして実施例４及び比較例３″Ｃは冷却媒
体としてＧ ＯｋＨ／ ０ｍ２の２次ブロー用の高圧、
常温空気を供給した本ま井１０を開くことにより、成形
′容器内に噴出させた。Example 4 and Comparative Example 3 In these Example 4 and Comparative Example 3, blow-molded containers were manufactured according to the cooling medium supply method described for the Pt53 diagram. In Example 4 and Comparative Example 3″C, high pressure for secondary blowing of G OkH/0m2 was used as the cooling medium.
By opening the main well 10 to which room temperature air was supplied, air was blown into the molded container.
実施例４では、型開き前に０．８秒（排気の時間と同じ
であるが、この開弁１５は閉じており、弁１（）のみ開
いている）、型開き後に０．８秒（この開ら弁１５は閉
じて、弁１０のみ開いている。冷却媒体は延伸ロッドを
通じて排気されるとともに、型開きに伴うンール５１の
ゆるみ部分がら、すなわちボトルの口部がらも排気され
るようになる。In Example 4, 0.8 seconds before opening the mold (same as the exhaust time, but this opening valve 15 is closed and only valve 1 ( ) is open), and 0.8 seconds after opening the mold ( When the mold is opened, the valve 15 is closed and only the valve 10 is open.The cooling medium is exhausted through the stretching rod, and the loose part of the noun 51 that occurs when the mold is opened, that is, the mouth of the bottle, is also exhausted. Become.
このときの断熱膨張による冷却の効果が大きいものと推
察される。）合せて１．６秒（ｔ、）の開、冷却媒体が
噴出される。その後１０を閉じれば、すぐ内圧は大気圧
に戻る。比較例３では２次ブロー時に井１０のみ開きな
がら（ｔ、）２ 、２秒、（排気の時間に相当するが弁
１５は閑のまま）、冷却媒体を噴出させ、型開き直面に
、弁１５をｌ１ｆｌいて排気１−１（ｔマ）（第１図の
タイムチャート参照）を行うと共に弁１８及び１９を閉
じ、冷却噴出をとめてがら型開きをＩｊＨ始した。この
例で成形された容器は型から取出したときに胴部がすで
に変形していた。It is presumed that the cooling effect due to adiabatic expansion at this time is large. ) for a total of 1.6 seconds (t, ), and the cooling medium is ejected. After that, when 10 is closed, the internal pressure immediately returns to atmospheric pressure. In Comparative Example 3, during secondary blowing, while only the well 10 was opened, the cooling medium was spouted out for 2.2 seconds (corresponding to the exhaust time, but the valve 15 remained idle), and the valve was opened on the surface of the mold opening. At the same time, the valves 18 and 19 were closed, and the mold opening was started at IjH while stopping the cooling jet. When the container molded in this example was removed from the mold, the body was already deformed.
！−記実施例４及び比較例３のプリ７↑−ムの重量、金
型温度、冷却媒体の種類及び各工程における所要時間（
ｔｏへ７Ｌ７）止びにそれぞれの例によって得られた３
’ ７６の特性を第１人に示す。! - Prime 7 in Example 4 and Comparative Example 3 - Weight of the mold, mold temperature, type of cooling medium, and time required for each process (
to 7L7) Finally, the 3 obtained by each example
' Demonstrate 76 characteristics to the first person.
第１表において、比較例２の冷却媒体の常温高圧空気の
圧力は３０ ｋｇ／ ａｍ２であり、実施例４及１比較
例３の冷却媒体の常温高圧空気の圧力は、いずれもＧ
Ｏｋｇ／ ｃｖａ２であった。また第１表中、比較例１
．２及び３の取出した０′器の容量の欄で本ｌを付しで
あるのは、金型から取出した成形容器の胴部に変形があ
ったことを示すものである。In Table 1, the pressure of the room temperature, high pressure air as the cooling medium in Comparative Example 2 is 30 kg/am2, and the pressure of the room temperature, high pressure air as the cooling medium in Examples 4 and 1 Comparative Example 3 is both G.
It was Okg/cva2. Also, in Table 1, Comparative Example 1
．． The fact that "I" is attached in the column of the capacity of the O' container taken out in Nos. 2 and 3 indicates that there was deformation in the body of the molded container taken out from the mold.
このように、変形が起っていたのでこれら比較例１．２
及び３では熱湯充填試験を行なわなかった。As described above, since deformation occurred, these comparative examples 1.2
In samples and 3, no hot water filling test was conducted.
（発明の効果）
本発明によれば、短時間の冷却媒体の噴出で、成形容器
が変形なく金型から取出せるようになり、しかも得られ
る容器は耐熱性に富むものであった。(Effects of the Invention) According to the present invention, the molded container can be removed from the mold without deformation by ejecting the cooling medium for a short period of time, and the resulting container is highly heat resistant.
第１図は本発明方法及び比較例によるブロー成形におけ
る各工程の時間的関係を例示する図表、第２図及び第３
Ｉ７１は本発明方法によるプロー成形を実施する装置を
例示する縦断正面略図である。
図中、１及び２は金型、３は底型、５は吹込みノズル、
６は延伸ロッド、２０は成形された容器である。
第１図
第２図
胃ｌ
、ＩＯFIG. 1 is a diagram illustrating the temporal relationship of each step in blow molding according to the method of the present invention and a comparative example, and FIGS.
I71 is a schematic longitudinal sectional front view illustrating an apparatus for performing blow molding according to the method of the present invention. In the figure, 1 and 2 are molds, 3 is a bottom mold, 5 is a blowing nozzle,
6 is a stretching rod, and 20 is a molded container. Figure 1 Figure 2 Stomach l, IO
Claims (1)
ル樹脂容器を製造するに当り、ブロー成形金型を高温に
保持しておいて、これでもってブロー成形された容器を
熱処理し、この成形容器の内部に冷却媒体を噴出させて
成形容器を冷却固定する方法において、上記の冷却媒体
を噴出させながら成形金型の型開きを開始することを特
徴とするブロー成形容器の製造法(1) When manufacturing a thermoplastic polyester resin container by two-wheel stretch blow molding, the blow molding mold is kept at a high temperature, and the blow molded container is heat treated with this mold, and the inside of the molded container is heated. A method for producing a blow-molded container, characterized in that the method for cooling and fixing a molded container by jetting a cooling medium comprises starting the opening of the molding die while spouting the cooling medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1142132A JPH039831A (en) | 1989-06-06 | 1989-06-06 | Manufacture of blow molded container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1142132A JPH039831A (en) | 1989-06-06 | 1989-06-06 | Manufacture of blow molded container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH039831A true JPH039831A (en) | 1991-01-17 |
Family
ID=15308115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1142132A Pending JPH039831A (en) | 1989-06-06 | 1989-06-06 | Manufacture of blow molded container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH039831A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994002304A1 (en) * | 1992-07-20 | 1994-02-03 | Yoshino Kogyosho Co., Ltd. | Molding method and cooling apparatus for pressure resisting bottles of synthetic resin |
| JP2007504022A (en) * | 2003-09-05 | 2007-03-01 | エスアイジー テクノロジー リミテッド | Container blow molding method and apparatus |
| JP2007530314A (en) * | 2004-03-25 | 2007-11-01 | クロネス・アクチェンゲゼルシャフト | Hollow body manufacturing method and apparatus for reducing air consumption |
| JP2010538869A (en) * | 2007-09-10 | 2010-12-16 | シデル パルティシパション | A process for forming a container having the step of flushing the inner volume of the container with a variable duration for at least one predetermined compensation time |
-
1989
- 1989-06-06 JP JP1142132A patent/JPH039831A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994002304A1 (en) * | 1992-07-20 | 1994-02-03 | Yoshino Kogyosho Co., Ltd. | Molding method and cooling apparatus for pressure resisting bottles of synthetic resin |
| US5585125A (en) * | 1992-07-20 | 1996-12-17 | Yoshino Kogyosho Co., Ltd. | Molding method and cooling apparatus for pressure resisting bottles of synthetic resin |
| US5851478A (en) * | 1992-07-20 | 1998-12-22 | Yoshino Kogyosho Co., Ltd. | Molding method and cooling apparatus for pressure resisting bottles of synthetic resin |
| JP2007504022A (en) * | 2003-09-05 | 2007-03-01 | エスアイジー テクノロジー リミテッド | Container blow molding method and apparatus |
| JP2007530314A (en) * | 2004-03-25 | 2007-11-01 | クロネス・アクチェンゲゼルシャフト | Hollow body manufacturing method and apparatus for reducing air consumption |
| US7892477B2 (en) | 2004-03-25 | 2011-02-22 | Krones Ag | Process and device for the manufacture of a particularly heat-resistant hollow body |
| US8550805B2 (en) | 2004-03-25 | 2013-10-08 | Krones Ag | Process and device for the manufacture of a particularly heat-resistant hollow body |
| US9044892B2 (en) | 2004-03-25 | 2015-06-02 | Krones Ag | Process and device for the manufacture of a particularly heat-resistant hollow body |
| JP2010538869A (en) * | 2007-09-10 | 2010-12-16 | シデル パルティシパション | A process for forming a container having the step of flushing the inner volume of the container with a variable duration for at least one predetermined compensation time |
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