JPH031923A - Blow molding of hollow synthetic resin product - Google Patents
Blow molding of hollow synthetic resin productInfo
- Publication number
- JPH031923A JPH031923A JP13664889A JP13664889A JPH031923A JP H031923 A JPH031923 A JP H031923A JP 13664889 A JP13664889 A JP 13664889A JP 13664889 A JP13664889 A JP 13664889A JP H031923 A JPH031923 A JP H031923A
- Authority
- JP
- Japan
- Prior art keywords
- parison
- blow molding
- synthetic resin
- fusing agent
- nozzle
- 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
- 238000000071 blow moulding Methods 0.000 title claims description 22
- 229920003002 synthetic resin Polymers 0.000 title claims description 13
- 239000000057 synthetic resin Substances 0.000 title claims description 13
- 238000005507 spraying Methods 0.000 claims abstract description 12
- 238000007664 blowing Methods 0.000 claims abstract description 9
- 230000004927 fusion Effects 0.000 abstract description 10
- 239000003795 chemical substances by application Substances 0.000 description 23
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920002545 silicone oil Polymers 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- -1 Polypropylene Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Landscapes
- 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］
本発明は、偏平品及び複雑な形状を有する合成樹脂の中
空成形品をプロー成形する方法で、特にパリソンが融着
するのを防止できる方法に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention is a method for blow molding flat products and hollow molded synthetic resin products having complex shapes, and in particular a method that can prevent parisons from fusing together. Regarding.
中空合成樹脂製品のブロー成形方法は、周知のごとく第
４図に示すように上吹口２としてダイス１から吐出され
た合成樹脂のパリソン３をエアーブロー状態で金型４で
型締めする。As is well known, in the blow molding method for hollow synthetic resin products, as shown in FIG. 4, a parison 3 of synthetic resin discharged from a die 1 as an upper blowing port 2 is clamped with a mold 4 while being blown with air.
そしてこのようなブロー成形方法により得る中空合成樹
脂製品として、例えば、自動車のバンパー等は偏平形状
で、またコーナ一部に深絞り部分を有するものとなり、
曲りを有するダクト類などは三次元中空成形品となる。Hollow synthetic resin products obtained by such blow molding methods include, for example, automobile bumpers, which have a flat shape and have deep-drawn parts at some corners.
Curved ducts and the like are three-dimensional hollow molded products.
薄肉でかつ偏平な形状を有する製品や？！雑な形状を有
する製品を成形するには、前記のごときブロー成形方法
では、金型４による型締め直後にパリソン３に融着が発
生する。この融着は成形品のコーナ一部や深絞り部等複
雑な部分に特に発生し易い。Products with thin walls and flat shapes? ! In order to mold a product having a rough shape, in the blow molding method described above, fusion occurs in the parison 3 immediately after the mold 4 is clamped. This fusion is particularly likely to occur in complex parts such as corners and deep drawing parts of molded products.
かかる融着が発生した状態でパリソン３にエアーを吹き
込むと、当該融着部付近でブローアツプ比が増大し、エ
アー圧力によってパリソン３に破れを生じてしまい、本
来中空であるべき成形品を得ることができない。If air is blown into the parison 3 in a state where such fusion has occurred, the blow-up ratio will increase near the fused portion, and the air pressure will cause the parison 3 to tear, making it impossible to obtain a molded product that should originally be hollow. I can't.
本発明の目的は前記従来例の不都合を解消し、複雑な形
状でも岐れを発生することなく中空成形品を得ることが
できる中空合成樹脂製品のブロー成形方法を提供するこ
とにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a blow molding method for hollow synthetic resin products, which eliminates the disadvantages of the conventional method and allows a hollow molded product to be obtained even in a complicated shape without causing any breakage.
本発明は前記目的を達成するため、ダイスから吐出する
パリソンをエアーブロー状態で金型で成形するブロー成
形方法において、ダイスのパリソン吐出口付近に剥離剤
等の融着防止剤の注出ノズルを設け、パリソンを吐出し
ている時に上吹口付近から融着防止剤をパリソン内面に
吹き付けてやること及び融着防止剤の吹き付けは、パリ
ソンコントローラーとシーケンスで組み合わせることを
要旨とするものである。In order to achieve the above-mentioned object, the present invention includes a blow molding method in which a parison discharged from a die is molded in a mold in an air-blown state. The gist is that the anti-fusing agent is sprayed onto the inner surface of the parison from near the upper blowing port when the parison is being discharged, and that the spraying of the anti-fusing agent is combined with the parison controller in sequence.
請求項第１項記載の本発明によれば、パリソンを吐出し
ている時に上映日付近から融着防止剤をパリソン内面に
吹き付けてやることによって、パリソンが一端融着して
も、吹き込みエアーによってパリソンが剥離し、破れを
発生することなく中空成形品を得ることができる。According to the present invention as set forth in claim 1, by spraying the anti-fusing agent onto the inner surface of the parison from around the screening date while the parison is being discharged, even if the parison partially fuses, it can be prevented by the blown air. A hollow molded product can be obtained without the parison peeling or tearing.
請求項第２項記載の本発明によれば、融着防止剤の吹き
付けは融着を起こし易いパリソン内面を選定して行い、
効果的な融着防止が得られるとともに、樹脂製品の性能
に影響を及ぼすこともない。According to the present invention as set forth in claim 2, the anti-fusing agent is sprayed by selecting the inner surface of the parison where fusing easily occurs,
Effective prevention of fusion can be obtained, and the performance of resin products is not affected.
以下、図面について本発明の実施例を詳細に説明する。 Embodiments of the present invention will be described in detail below with reference to the drawings.
第１図は本発明の中空合成樹脂製品のブロー成形方法の
１実施例を示す説明図で、前記従来例を示す第４図と同
一構成要素には同一参照符号を付したものである。FIG. 1 is an explanatory diagram showing one embodiment of the blow molding method for hollow synthetic resin products of the present invention, and the same components as in FIG. 4 showing the conventional example are given the same reference numerals.
すなわち、図中１は上吹口２を有するダイス、３は上吹
口２から吐出された合成樹脂のパリソン、４はこのパリ
ソン３をエアーブロー状態で型締めする金型である。That is, in the figure, 1 is a die having an upper nozzle 2, 3 is a parison of synthetic resin discharged from the upper nozzle 2, and 4 is a mold for clamping the parison 3 in an air-blown state.
本発明は、ダイスｌの上吹口２付近に融着防止剤の注出
ノズル５を設けた。In the present invention, an anti-fusing agent pouring nozzle 5 is provided near the upper blowing port 2 of the die l.
このノズル５の元には電磁弁６が設けられ、さらに融着
防止剤サージタンク７にフィードポンプ８を介して接続
される。また、フィードポンプ８と電磁弁６との間には
逆止弁１１及びエジェクターノズル９が配設され、融着
防止剤サージタンク７とフィードポンプ８との間にも逆
止弁１１が挿入され、またフィードポンプ８の流出側は
分岐されて融着防止剤サージタンク７にもどるリサイク
ルライン１０が形成され、ここにも逆止弁１１が設けら
れる。A solenoid valve 6 is provided at the base of this nozzle 5, and is further connected to an anti-fusing agent surge tank 7 via a feed pump 8. Further, a check valve 11 and an ejector nozzle 9 are arranged between the feed pump 8 and the solenoid valve 6, and a check valve 11 is also inserted between the anti-fusing agent surge tank 7 and the feed pump 8. Further, the outflow side of the feed pump 8 is branched to form a recycle line 10 that returns to the anti-fusing agent surge tank 7, and a check valve 11 is also provided here.
前記エジェクターノズル９には逆止弁１１’を介してエ
アー′ａ１２が接続され、該エジェクターノズル９を介
してノズル５に融着防止剤注出のためのエアー圧力を付
与する０図中１５は、圧力計である。Air 'a12' is connected to the ejector nozzle 9 through a check valve 11', and air pressure is applied to the nozzle 5 through the ejector nozzle 9 for dispensing the anti-fusing agent. , is a pressure gauge.
電磁弁６の開閉の制御機構としては、パリソンコントロ
ーラー１４がステップ出力選択ユニット１３を介してこ
の電磁弁６に接続される。As a control mechanism for opening and closing the solenoid valve 6, a parison controller 14 is connected to the solenoid valve 6 via a step output selection unit 13.
第２図はかかる電磁弁６の制御でパリソンコントローラ
ー１４とシーケンスをとるための詳細を示すもので、パ
リソンコントローラー１４とステップ出力選択ユニット
１３を装着し、パリソンコントローラー１４の任意のス
テップポイントで電磁弁を開閉するこ“とができる。ま
た、ステップ出力選択ユニット１３のかわりに、タイマ
ーで電磁弁の開閉を行うようにしてもよい。FIG. 2 shows details of how to control the solenoid valve 6 and take a sequence with the parison controller 14.The parison controller 14 and the step output selection unit 13 are installed, and the solenoid valve is activated at any step point of the parison controller 14. Furthermore, instead of the step output selection unit 13, a timer may be used to open and close the solenoid valve.
なお、前記サージタンク７に貯め、ノズル５から注出す
る融着防止剤としては、シリコーンオイル等の界面活性
剤による剥離剤が適する。Note that as the anti-fusing agent stored in the surge tank 7 and poured out from the nozzle 5, a release agent made of a surfactant such as silicone oil is suitable.
次に、以上の装置を用いて行う本発明方法について説明
する。Next, the method of the present invention using the above-mentioned apparatus will be explained.
ダイス１の上吹口２からパリソン３を吐出している時に
、ノズル５から融着防止剤を注出してこの融着防止剤を
パリソン３の内面に吹き付けてやる。この融着防止剤は
サージタンク７でエジェクターノズル９に送られ、ここ
でエアー源１２からの圧力空気が加わるので、電磁弁６
が開かれるとノズル５から噴射されパリソン３の内面に
散布される。While the parison 3 is being discharged from the upper outlet 2 of the die 1, the anti-fusing agent is poured out from the nozzle 5 and sprayed onto the inner surface of the parison 3. This anti-fusing agent is sent to the ejector nozzle 9 in the surge tank 7, where pressurized air from the air source 12 is applied, so that the solenoid valve 6
When it is opened, it is injected from the nozzle 5 and sprayed on the inner surface of the parison 3.
該融着防止剤の吹きつけは、パリソン３の肉厚プログラ
ムをコントロールするパリソンコントローラー１４にス
テップ出力選択ユニット１３庖装着することによって任
意の設定で散布できるようになっており、第３図に示す
ように、２ケ所の、特に融着を起こし易いパリソン３の
内面に吹き付けるタイミングを設定して行われる。The anti-fusing agent can be sprayed at any setting by attaching a step output selection unit 13 to the parison controller 14 that controls the wall thickness program of the parison 3, as shown in Fig. 3. The spraying is performed at two locations, particularly on the inner surface of the parison 3 where fusion is likely to occur.
このようにして、融着防止剤をパリソン３の内面に吹き
付けることにより、該パリソン３が一端融着しても吹き
込みエアーによってパリソン３が剥離し、破れを発生す
ることなく、中空成形品を金型４による型締めで得るこ
とができる。In this way, by spraying the anti-fusing agent onto the inner surface of the parison 3, even if the parison 3 is partially fused, the parison 3 will be peeled off by the blown air, and the hollow molded product will not be damaged. It can be obtained by clamping with mold 4.
また融着防止剤は、型締め後、吹き込みエアーによって
パリソン３内が加圧されるまでの数秒間だけ融着を防止
できるもので、樹脂製品の性能に影響を及ぼすことはな
い。Further, the anti-fusing agent can prevent fusing for only a few seconds until the inside of the parison 3 is pressurized by blown air after mold clamping, and does not affect the performance of the resin product.
さらに、融着防止剤の散布が不要な時は電磁弁６は閉じ
られ、この時融着防止剤はリサイクルライン１０を介し
てサージタンク７にもどされる。Further, when the spraying of the anti-fusing agent is unnecessary, the solenoid valve 6 is closed, and at this time the anti-fusing agent is returned to the surge tank 7 via the recycling line 10.
次に、本発明の効果を確認するために、本発明のシーケ
ンスを採用したバンパーのブロー成形実験結果を述べる
。Next, in order to confirm the effects of the present invention, the results of a bumper blow molding experiment using the sequence of the present invention will be described.
ポリプロピレン（ｐｐ）を原料樹脂とし、大型中空成形
機〔石川島播磨重工業社製、ＩＰＢ−２０００（商品名
）］を使用して、第１および２図に示す装置と第３図に
示すタイムチャートで、シリコーンオイル（融着防止剤
）をパリソン内部に吹き付は型締め５秒後にブロー成形
を行ったが、コーナ一部でパリソンが融着することなく
長さ１８００ｍ転厚み１０Ｏｍｍ、コーナー角度８７°
、コーナ一部長さ２００■、同厚み３０ＩＩＩＩ＋のブ
ローバンパーを成形することができた。Polypropylene (PP) was used as the raw material resin, and a large blow molding machine [manufactured by Ishikawajima Harima Heavy Industries Co., Ltd., IPB-2000 (trade name)] was used, and the equipment shown in Figures 1 and 2 and the time chart shown in Figure 3 were used. Blow molding was performed after spraying silicone oil (anti-fusing agent) inside the parison after 5 seconds of mold clamping, but the parison did not fuse at some of the corners, and the length was 1800 m, the thickness was 10 Omm, and the corner angle was 87°.
It was possible to mold a blow bumper with a corner part length of 200cm and a thickness of 30III+.
なお、比較のために上記において、シリコーンオイルを
吹き付けずに型締め１秒後にブロー成形を行ったところ
、コーナ一部でパリソンが融着して破れを発生した。For comparison, when blow molding was performed 1 second after mold clamping without spraying silicone oil, the parison was fused and torn at some corners.
以上述べたように本発明の中空合成樹脂製品のブロー成
形方法は、ダイスから吐出するパリソンをエアーブロー
状態で金型で成形するブロー成形方法において、パリソ
ンの融着を防止することにより、偏平品や長尺品又は複
雑な形状を有する製品を得ることができるものであり、
また、パリソン３内に融着防止剤を散布することにより
パリソン自体に及ぼす悪影響もないものである。さらに
、融着防止剤散布とパリソンコントローラーとをシーケ
ンスで組合せることで融着し易い部分に正確に散布でき
るものである。As described above, the blow molding method for hollow synthetic resin products of the present invention is a blow molding method in which a parison discharged from a die is molded in a mold in an air-blown state. It is possible to obtain long products or products with complex shapes,
Furthermore, spraying the anti-fusing agent into the parison 3 does not have any adverse effects on the parison itself. Furthermore, by combining the spraying of the anti-fusing agent and the parison controller in sequence, it is possible to accurately spray the anti-fusing agent to areas that are prone to fusing.
その結果、従来中空成形品として成しえなかった形状の
ものを成形できるようになり、成形条件及び成形範囲が
広がるので製品の自由度が拡大でき、三次元中空成形へ
の応用も可能なものである。As a result, it is now possible to mold shapes that could not be achieved with conventional blow molding, and the molding conditions and molding range are expanded, increasing the degree of freedom of the product and making it possible to apply it to three-dimensional blow molding. It is.
加えて、ブロー成形機には上吹口が常設されているので
、成形機を選ばずに本発明を簡単に実施することができ
る。In addition, since the blow molding machine is permanently equipped with an upper blowing port, the present invention can be easily carried out regardless of the molding machine.
第１図は本発明の第１図は本発明の中空合成樹脂製品の
ブロー成形方法の１実施例を示す説明図、第２図は電磁
弁の制御を示す説明図、第３図は同上タイムチャート、
第４図は従来例を示す縦断側面図である。
１・・・ダイス ２・・・上吹口３・・・
パリソン ４・・・金型５・・・ノズル
６・・・電磁弁７・・・融着防止剤サージタ
ンク
８・・・フィードポンプ
９・・・エジェクターノズル １０・・・リサイクルラ
イン１１、１１’・・・逆止弁 １２・・・エア
ー源１３・・・ステップ出力選択ユニット
１４・・・パリソンコントローラー
１５・・・圧力針
出願人 東燃石油化学株式会社Fig. 1 is an explanatory diagram showing one embodiment of the blow molding method for hollow synthetic resin products of the present invention, Fig. 2 is an explanatory diagram showing control of a solenoid valve, and Fig. 3 is an explanatory diagram showing an example of the method of blow molding a hollow synthetic resin product of the present invention. chart,
FIG. 4 is a longitudinal sectional side view showing a conventional example. 1...Dice 2...Upper opening 3...
Parison 4... Mold 5... Nozzle
6... Solenoid valve 7... Anti-fusing agent surge tank 8... Feed pump 9... Ejector nozzle 10... Recycle line 11, 11'... Check valve 12... Air source 13...Step output selection unit 14...Parison controller 15...Pressure needle Applicant: Tonen Petrochemical Co., Ltd.
Claims (2)
で金型で成形するブロー成形方法において、ダイスのパ
リソン吐出口付近に剥離剤等の融着防止剤の注出ノズル
を設け、パリソンを吐出している時に上吹口付近から融
着防止剤をパリソン内面に吹き付けてやることを特徴と
する中空合成樹脂製品のブロー成形方法。(1) In a blow molding method in which the parison discharged from a die is molded in a mold under air blowing, a nozzle for dispensing an anti-fusing agent such as a release agent is provided near the parison discharge port of the die, and the parison is discharged. A blow molding method for hollow synthetic resin products characterized by spraying an anti-fusing agent onto the inner surface of the parison from near the upper blowing port when the parison is in use.
ーとシーケンスで組み合わせる請求項第１項記載の中空
合成樹脂製品のブロー成形方法。(2) The blow molding method for hollow synthetic resin products according to claim 1, wherein the spraying of the anti-fusing agent is performed in sequence with a parison controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13664889A JPH031923A (en) | 1989-05-30 | 1989-05-30 | Blow molding of hollow synthetic resin product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13664889A JPH031923A (en) | 1989-05-30 | 1989-05-30 | Blow molding of hollow synthetic resin product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH031923A true JPH031923A (en) | 1991-01-08 |
Family
ID=15180238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13664889A Pending JPH031923A (en) | 1989-05-30 | 1989-05-30 | Blow molding of hollow synthetic resin product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH031923A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007162179A (en) * | 2005-12-15 | 2007-06-28 | Yellow:Kk | Folding type cap |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62292418A (en) * | 1986-05-28 | 1987-12-19 | ジョン・ディ−・ブラシュ・アンド・カンパニ−・インコ−ポレ−テッド | Blow molding method and device |
-
1989
- 1989-05-30 JP JP13664889A patent/JPH031923A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62292418A (en) * | 1986-05-28 | 1987-12-19 | ジョン・ディ−・ブラシュ・アンド・カンパニ−・インコ−ポレ−テッド | Blow molding method and device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007162179A (en) * | 2005-12-15 | 2007-06-28 | Yellow:Kk | Folding type cap |
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