JP2928936B2 - Cooling method for blow molded products - Google Patents

Cooling method for blow molded products

Info

Publication number
JP2928936B2
JP2928936B2 JP2086992A JP8699290A JP2928936B2 JP 2928936 B2 JP2928936 B2 JP 2928936B2 JP 2086992 A JP2086992 A JP 2086992A JP 8699290 A JP8699290 A JP 8699290A JP 2928936 B2 JP2928936 B2 JP 2928936B2
Authority
JP
Japan
Prior art keywords
cooling
molded article
blow
temperature
liquefied gas
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.)
Expired - Fee Related
Application number
JP2086992A
Other languages
Japanese (ja)
Other versions
JPH03284930A (en
Inventor
正広 湯浅
春男 仙北谷
伯太彦 福島
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.)
Daido Hokusan Kk
Original Assignee
Daido Hokusan Kk
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 Daido Hokusan Kk filed Critical Daido Hokusan Kk
Priority to JP2086992A priority Critical patent/JP2928936B2/en
Publication of JPH03284930A publication Critical patent/JPH03284930A/en
Application granted granted Critical
Publication of JP2928936B2 publication Critical patent/JP2928936B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/66—Cooling by refrigerant introduced into the blown article
    • 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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6604—Thermal conditioning of the blown article
    • B29C2049/6606—Cooling the article
    • B29C2049/6607—Flushing blown articles
    • B29C2049/6646—Flushing blown articles while keeping the final blowing pressure in the article
    • 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

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、合成樹脂など有機可塑性物質の中空製品を
ブロー成形によって製造する際に、ブロー成形品の内部
を冷却する冷却方法に関する。Description: TECHNICAL FIELD The present invention relates to a cooling method for cooling the inside of a blow molded product when a hollow product of an organic plastic material such as a synthetic resin is manufactured by blow molding.

［従来技術］ ブロー成形により中空プロスチック容器を製造する場
合、吹込み用空気に替えて液化窒素、液化炭酸ガス等の
液化ガス冷媒を吹込み、これらの液化ガスによりブロー
成形を行なうと同時に、製品の内部から冷却し、冷却時
間を短縮する方法が実施されている。[Prior art] When manufacturing a hollow plastic container by blow molding, a liquefied gas refrigerant such as liquefied nitrogen or liquefied carbon dioxide gas is blown in instead of blowing air, and blow molding is performed with these liquefied gases, and at the same time, products are manufactured. In order to reduce the cooling time, cooling is performed from the inside of the inside.

この方法では、液化ガスが供給用電磁弁から２重構造
になったブローピンを経て金型内に供給され、吹込み工
程の完了後にブローピンの外筒から排気用電磁弁を介し
て系外に排気されているようになっている。また、液化
ガスの供給は、一定流量を一定時間吹込むようにして行
なっている。In this method, a liquefied gas is supplied from a supply solenoid valve to a mold through a blow pin having a double structure, and is exhausted from the outer cylinder of the blow pin to the outside of the system via an exhaust solenoid valve after the blowing step is completed. It has become like that. In addition, the supply of the liquefied gas is performed by blowing a constant flow rate for a fixed time.

［発明が解決しようとする課題］ 上記従来の方法では、成形および冷却工程を能率よく
行なうことができるが、液化ガス吹込み工程が終了し
て、ブロー成形が完了した後に排気を開始する方法の場
合、液化ガス供給電磁弁下流側の導管圧力と製品の内圧
が同圧となるために、導管内に残留する液化ガスの噴霧
力が弱くなり、冷熱が有効に活用されず、均一な冷却効
果を得ることができないという問題点があった。従っ
て、極端な場合には導管及びブローピン内の冷媒が製品
内に残留するという事態が生じていた。[Problems to be Solved by the Invention] In the above-described conventional method, the molding and cooling steps can be performed efficiently, but the exhaustion is started after the liquefied gas blowing step is completed and the blow molding is completed. In this case, since the pressure of the conduit downstream of the liquefied gas supply solenoid valve and the internal pressure of the product are the same, the spraying power of the liquefied gas remaining in the conduit is weakened, and the cooling heat is not effectively used, and the uniform cooling effect There was a problem that it was not possible to obtain. Therefore, in an extreme case, a situation has occurred in which the refrigerant in the conduit and the blow pin remains in the product.

また、液化ガスの導入量が微細に監視、調節されてい
ないため、成形、冷却の過程で供給量が変動した場合、
冷却過剰又は、冷却不足という事態も生じ、不良品が生
産されるという問題点もあった。特に、ブロー成形では
複数個の容器を同時成形する場合が多く、液化ガスの供
給バランスを成形品の取出し直後の表面温度で判断して
いるため、不良品を発生する可能性が高かった。In addition, because the amount of liquefied gas introduced is not monitored and adjusted finely, if the supply amount fluctuates during the molding and
There is also a problem that excessive cooling or insufficient cooling occurs, and defective products are produced. In particular, in blow molding, a plurality of containers are often molded at the same time, and the supply balance of the liquefied gas is determined based on the surface temperature immediately after the removal of the molded product. Therefore, there is a high possibility that defective products will be generated.

［課題を解決するための手段］ 本発明は上記課題を解決するために次のような構成を
採用した。[Means for Solving the Problems] The present invention employs the following configuration in order to solve the above problems.

すなわち、本発明にかかるブロー成形品の冷却方法
は、熱可塑性樹脂の中空成形品を液体窒素等の液化ガス
冷媒によってブロー成形し、液化ガスの気化熱によって
成形内部から冷却を行なうようにしたブロー成形品の冷
却方法において、成形品内部冷却後に排気される気化ガ
スの温度又は流量を計測する計測器を設けておき、その
計測値があらかじめ設定された適正範囲を超える場合
に、当該適正範囲内に計測値が入るように成形品内へ供
給する液化ガス供給量を調節し、成形品の冷却が均一に
行なわれるようにすることを特徴とする。That is, the method of cooling a blow molded product according to the present invention is a blow molding method in which a hollow molded product of a thermoplastic resin is blow molded with a liquefied gas refrigerant such as liquid nitrogen and the inside of the molding is cooled by the heat of vaporization of the liquefied gas. In the method of cooling a molded article, a measuring instrument for measuring the temperature or the flow rate of the vaporized gas exhausted after cooling the molded article is provided, and if the measured value exceeds a predetermined appropriate range, the temperature falls within the appropriate range. The amount of liquefied gas supplied to the inside of the molded article is adjusted so that the measured value enters the molded article, so that the molded article is cooled uniformly.

［作用］ 本発明によれば、排気直後の気化ガス温度又は流量を
計測することにより、容器内の冷却状態が把握されるの
で、冷却過剰又は冷却不足が生じないように液化ガスの
供給量が制御される。[Operation] According to the present invention, the cooling state in the container is grasped by measuring the vaporized gas temperature or the flow rate immediately after the exhaust, so that the supply amount of the liquefied gas is controlled so that excessive cooling or insufficient cooling does not occur. Controlled.

［実施例］ 第１図は、本発明の冷却方法を実施することによって
熱可塑性樹脂のブロー成形品を製造するブロー成形機の
構成を示す図で、金型１内の中空成形品（パリソン）２
にブローピン３が挿入されている。ブローピン３は二重
構造で、内管3aが簡易断熱材を施した配管５を介してLN
2（液体窒素）容器６に連通接続されている。断熱配管
５にはLN2供給用電磁弁７およびLN2流量調節弁８が設け
られており、該電磁弁７を開にすると、LN2は断熱配管
５、LN2供給用電磁弁７、ブローピン３の内管3aを経て
金型１内のパリソン２内に供給される。LN2はブローピ
ン内管3a先端のノズルからパリソン２に吹込まれ、ブロ
ー成形するとともに、蒸発潜熱と顕熱によって内部冷却
を行なう。FIG. 1 is a view showing a configuration of a blow molding machine for producing a blow molded product of a thermoplastic resin by performing a cooling method of the present invention, and a hollow molded product (parison) in a mold 1 is shown. 2
The blow pin 3 is inserted into the blower. The blow pin 3 has a double structure, and the inner pipe 3a is LN
2 (Liquid nitrogen) Connected to the container 6. The heat insulating pipe 5 is provided with an LN 2 supply solenoid valve 7 and an LN 2 flow rate control valve 8. When the solenoid valve 7 is opened, the LN 2 becomes the heat insulation pipe 5, the LN 2 supply solenoid valve 7, the blow pin It is supplied into the parison 2 in the mold 1 through the inner tube 3a of the mold 3. LN 2 is blown into the parison 2 from the nozzle at the tip of the blow pin inner tube 3a, and is blow-molded, and performs internal cooling by latent heat of evaporation and sensible heat.

気化した窒素ガス（以下、GN2と記す）は、ブローピ
ンの外管3bから排気ライン９を介して排気されるが、外
管3bと排気ライン９を接続する接続口にGN2排ガス温度
を計測する計測器として、温度センサ10が設けられてい
る。ブローピンを出た直後の排ガス温度は金型内部温度
に近く、温度センサ10は排ガス温度を内部冷却温度とし
て検出する。排気ライン９中には排気用電磁弁12及び保
圧調整弁13が設けられている。保圧調整弁13は、LN2が
気化してブロー圧力以上になる場合に、余剰ガスを排気
して圧力を一定に保つものである。The vaporized nitrogen gas (hereinafter referred to as GN 2 ) is exhausted from the outer tube 3b of the blow pin through the exhaust line 9, and the GN 2 exhaust gas temperature is measured at a connection port connecting the outer tube 3b and the exhaust line 9. A temperature sensor 10 is provided as a measuring instrument for performing the measurement. The temperature of the exhaust gas immediately after leaving the blow pin is close to the mold internal temperature, and the temperature sensor 10 detects the exhaust gas temperature as the internal cooling temperature. In the exhaust line 9, an exhaust solenoid valve 12 and a holding pressure adjusting valve 13 are provided. When the LN 2 is vaporized and becomes equal to or higher than the blow pressure, the holding pressure adjusting valve 13 exhausts excess gas to keep the pressure constant.

上記LN2供給用電磁弁７、排気用電磁弁12の開閉操作
は、各電磁弁のソレノイドへの通電を制御するバルブ開
閉制御回路15からの駆動信号によって行なわれる。この
制御回路15は、ブロー成形・冷却並びに排気の処理サイ
クルに応じて電磁弁７、12の開閉を行ない、LN2の供
給、GN2の排気を制御する。また、制御回路15による制
御タイミングは外部設定器16によって任意に設定でき
る。また、制御回路15は、ブローピンの外管3bと排気ラ
イン９の接続口に設けた温度センサ10が検出する排気ガ
ス温度を常時読み込み監視し、温度表示器17に表示させ
る。また、制御回路15は、製品である容器の熱容量に応
じて適正冷却温度が設定器16により設定されており、検
出温度と設定温度との比較判断も行なう。The opening / closing operation of the LN 2 supply solenoid valve 7 and the exhaust solenoid valve 12 is performed by a drive signal from a valve opening / closing control circuit 15 that controls the energization of the solenoid of each solenoid valve. The control circuit 15 opens and closes the solenoid valves 7 and 12 in accordance with the blow molding / cooling and exhaust processing cycles, and controls the supply of LN 2 and the exhaust of GN 2 . The control timing by the control circuit 15 can be arbitrarily set by the external setting device 16. Further, the control circuit 15 constantly reads and monitors the exhaust gas temperature detected by the temperature sensor 10 provided at the connection port between the outer tube 3b of the blow pin and the exhaust line 9, and displays the temperature on the temperature display 17. Further, the control circuit 15 sets an appropriate cooling temperature by the setter 16 according to the heat capacity of the container as a product, and also performs a comparison judgment between the detected temperature and the set temperature.

上記のように構成されたブロー成形機において、製品
内部の冷却に利用されたGN2の排気工程が、LN2ブロー工
程終了より若干早く（0.5〜５秒）開始されるように排
気用電磁弁12の開操作のタイミングを設定しておけば、
後述のように冷熱の有効利用が図れるので好ましい。ま
た、制御回路15には、排気工程開始直後の排ガス温度
が、あらかじめ設定された適正温度の範囲を逸脱する場
合に、該温度が適正範囲になるようにLN2流量調節弁８
の開閉を調節してLN2の供給量を自動的に制御するよう
に処理手順をプログラムしておくのが好ましい。In the blow molding machine configured as described above, the exhaust valve of the GN 2 used for cooling the inside of the product is started slightly earlier (0.5 to 5 seconds) than the end of the LN 2 blow step. If you set the timing of the opening operation of 12,
As will be described later, it is preferable because cold heat can be effectively used. In addition, when the exhaust gas temperature immediately after the start of the exhaust process deviates from a preset appropriate temperature range, the control circuit 15 controls the LN 2 flow rate control valve 8 so that the temperature falls within the appropriate range.
Preferred closing adjusted to the idea to program the processing procedure to automatically control the supply amount of the LN 2 of.

このように設定された冷却処理手順において、ブロー
工程終了よりも若干早く排気を開始することによりLN2
供給圧力と成形品の内圧に差圧が生じ、成形品内の乱流
状態が大きくなって熱伝達効果が大きくなり、冷熱が有
効に利用される。また、排気ライン側へ急速に冷温の気
化ガスが流動し、成形品内部の冷却が迅速かつ均一に行
なわれる。しかも、LN2供給側の導入路やブローピン内
管3aに残留するLN2も高差圧により成形品内に吐出され
て、有効に冷却に利用されるので、成形品内にLN2が残
留する等の事態を防止できる。In the cooling procedure set as described above, the exhaust is started slightly earlier than the end of the blowing step, so that the LN 2
A differential pressure is generated between the supply pressure and the internal pressure of the molded product, the turbulence state in the molded product is increased, the heat transfer effect is increased, and the cold is effectively used. In addition, the cold vaporized gas flows rapidly to the exhaust line side, and the inside of the molded product is cooled quickly and uniformly. Moreover, LN 2 remaining in the introduction path and the blow pin within tube 3a of LN 2 supply side be discharged into the molded article by the high differential pressure, since it is utilized to effectively cool, LN 2 remains in the molded article Can be prevented.

一方、成形品冷却時の排ガス温度は、成形品の熱容量
（温度、材質、肉厚、表面積等）により、またLN2の供
給量により異なる。従って、上記実施例のように特定の
製品に対して最適な冷却条件となる排ガス温度を計測し
ながら、LN2の供給量を制御するので、冷却過剰、冷却
不足による不良品の発生を防止することができる。On the other hand, the temperature of the exhaust gas at the time of cooling the molded article differs depending on the heat capacity (temperature, material, wall thickness, surface area, etc.) of the molded article and the supply amount of LN 2 . Therefore, since the supply amount of LN 2 is controlled while measuring the exhaust gas temperature which is the optimum cooling condition for a specific product as in the above embodiment, the occurrence of defective products due to excessive cooling and insufficient cooling is prevented. be able to.

上記実施例では排ガス温度を計測して、LN2の供給量
を制御したが、排ガスの流量を計測して内部冷却状態の
判断データとしてもよい。また、冷却に使用されたGN2
は排気用電磁弁を介して放出されるが、これを回収して
プリブロー用に利用しても良い。さらに、第２図に示す
ように、２個以上の複数個取りの金型20の場合にも、排
ガス温度を計測しながら、各液化ガス供給ラインの電磁
弁を調節して冷媒の供給量を制御すれば、各成形品への
冷媒供給量のバランス調節を行なうことができる。その
ため、冷却時間の短縮、増産、生産コストの低減を一層
能率よく行なうことができる。In the above embodiment measures the exhaust gas temperature has been controlled the supply of LN 2, it may be determined data of the internal cooling conditions by measuring the flow rate of the exhaust gas. Also, GN 2 used for cooling
Is released via an exhaust electromagnetic valve, but may be collected and used for pre-blowing. Further, as shown in FIG. 2, even in the case of two or more multi-cavity molds 20, while controlling the exhaust gas temperature, the solenoid valve of each liquefied gas supply line is adjusted to reduce the supply amount of the refrigerant. By controlling, it is possible to adjust the balance of the refrigerant supply amount to each molded article. Therefore, the cooling time can be reduced, the production can be increased, and the production cost can be reduced more efficiently.

［発明の効果］ 上記説明から明らかなように、本発明にかかるブロー
成形品の冷却方法によれば、製造する製品の材質、肉厚
等の相異により熱容量が異なっても、各製品に対して過
不足なく最適な冷却を行なうことができ、不良品の発生
を防止することもできるようになった。[Effects of the Invention] As is clear from the above description, according to the method for cooling a blow-molded product according to the present invention, even if the heat capacity differs due to differences in the material, thickness, etc. of the product to be manufactured, As a result, optimal cooling can be performed without excess or shortage, and the occurrence of defective products can be prevented.

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

第１図は本発明の方法を実施する装置の構成を示す図、
第２図は変形実施例の要部を示す図である。 １……金型、２……中空成形品、３……ブローピン、５
……断熱配管、７……LN2供給用電磁弁、９……排気ラ
イン、10……温度センサ、12……排気用電磁弁、15……
制御回路FIG. 1 is a diagram showing the configuration of an apparatus for implementing the method of the present invention,
FIG. 2 is a view showing a main part of a modified embodiment. 1 ... mold, 2 ... hollow molded product, 3 ... blow pin, 5
… Insulated piping, 7… LN 2 supply solenoid valve, 9… Exhaust line, 10… Temperature sensor, 12… Exhaust solenoid valve, 15…
Control circuit

フロントページの続き (56)参考文献 特開 昭51−52467（ＪＰ，Ａ) 特開 昭57−157322（ＪＰ，Ａ) 特開 昭60−120031（ＪＰ，Ａ) 特開 平３−9831（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 49/00 - 49/80 Continuation of the front page (56) References JP-A-51-52467 (JP, A) JP-A-57-157322 (JP, A) JP-A-60-120031 (JP, A) JP-A-3-9831 (JP) , A) (58) Field surveyed (Int. Cl. 6 , DB name) B29C 49/00-49/80

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】熱可塑性樹脂の中空成形品を、液体窒素等
の液化ガス冷媒によってブロー成形し、液化ガスの気化
熱によって成形品内部から冷却を行なうようにしたブロ
ー成形品の冷却方法において、成形品の内部冷却後に排
気される気化ガスの温度又は流量を計測する計測器を設
けておき、その計測値があらかじめ設定された適正範囲
を超える場合に、当該適正範囲内に計測値が入るように
成形品内へ供給する液化ガス供給量を調節し、成形品の
冷却が均一に行なわれるようにすることを特徴とするブ
ロー成形品の冷却方法。1. A method for cooling a blow molded article, comprising blow molding a hollow molded article of a thermoplastic resin with a liquefied gas refrigerant such as liquid nitrogen, and cooling from inside the molded article by the heat of vaporization of the liquefied gas. Provide a measuring device to measure the temperature or flow rate of the vaporized gas exhausted after the internal cooling of the molded article, and if the measured value exceeds a predetermined appropriate range, the measured value falls within the appropriate range. A method for cooling a blow-molded article, characterized in that the amount of liquefied gas supplied to the inside of the molded article is adjusted so that the molded article is cooled uniformly. 【請求項２】ブロー成形完了直前に、成形品内の気化ガ
ス排気を開始する特許請求の範囲第１項に記載のブロー
成形品の冷却方法。2. The method for cooling a blow-molded article according to claim 1, wherein the evacuation of the vaporized gas in the molded article is started immediately before the completion of the blow-molding.
JP2086992A 1990-03-30 1990-03-30 Cooling method for blow molded products Expired - Fee Related JP2928936B2 (en)

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JP2086992A JP2928936B2 (en) 1990-03-30 1990-03-30 Cooling method for blow molded products

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Application Number Priority Date Filing Date Title
JP2086992A JP2928936B2 (en) 1990-03-30 1990-03-30 Cooling method for blow molded products

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JPH03284930A JPH03284930A (en) 1991-12-16
JP2928936B2 true JP2928936B2 (en) 1999-08-03

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0655622A (en) * 1992-08-07 1994-03-01 Ube Ind Ltd Blow molding method
CN114986855B (en) * 2022-07-19 2022-11-01 广东乐善智能装备股份有限公司 Self-adaptive bottle blowing control method and system for bottle blowing machine

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