JPS61116526A - Molding process of foaming resin - Google Patents
Molding process of foaming resinInfo
- Publication number
- JPS61116526A JPS61116526A JP59237931A JP23793184A JPS61116526A JP S61116526 A JPS61116526 A JP S61116526A JP 59237931 A JP59237931 A JP 59237931A JP 23793184 A JP23793184 A JP 23793184A JP S61116526 A JPS61116526 A JP S61116526A
- Authority
- JP
- Japan
- Prior art keywords
- molding
- particles
- hot air
- time
- aging
- 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
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Description
【発明の詳細な説明】
く技術分野〉
この発明は発泡樹脂の成形方法に関し、熱可塑性樹脂の
発泡粒子を加熱ｍ着させて成形する、いわゆるビーズ成
形において、特に予備発泡粒子の熟成工程に関している
。[Detailed Description of the Invention] Technical Field> The present invention relates to a method for molding foamed resin, and particularly relates to the aging process of pre-expanded particles in so-called bead molding, in which foamed particles of thermoplastic resin are molded by heating. .
〈従来技術〉
上記ビーズ成形においては、予め製造した熱可塑性樹脂
からなる発泡性粒子、即ちビーズを、予備発泡させた後
、一定時間自然に放置して熟成させる熟成工程を行い、
この熟成後の予備発泡粒子を原料として成形型の型窩内
に充填し、原料粒子を蒸気等の加熱媒体で加熱すること
によって、互いに熱融着させて、所定の製品を成形製造
するものである。<Prior art> In the above-mentioned bead molding, expandable particles, that is, beads made of a thermoplastic resin manufactured in advance are pre-foamed, and then an aging process is performed in which they are left to mature naturally for a certain period of time.
These aged pre-expanded particles are used as a raw material to fill the cavity of a mold, and the raw material particles are heated with a heating medium such as steam to fuse them together to form a desired product. be.
上記成形方法のおける熟成工程とは、予備発泡後の予備
発泡粒子に対して、減圧状態の気泡内部への空気の浸透
、発泡剤の安定化、発泡時の付着水分の乾燥等を図り、
成形品の発泡圧力を安定させたり、成形後に成形品が収
縮するのを防ぎ、成形品の品質が低下するのを防ぐため
に行うものである。そして、従来は予備発泡後の予備発
泡粒子を、金網製のサイロ内等、乾燥した空気の流通の
良い場所に放置しで、経時と共に自然に熟成さけていた
。この熟成時間としては、最低６時間以上、通常は２４
時間程度必要とされていた。The maturing step in the above molding method is a process in which the pre-expanded particles are pre-expanded after they are pre-foamed to allow air to penetrate inside the cells under reduced pressure, stabilize the blowing agent, dry moisture adhering during foaming, etc.
This is done to stabilize the foaming pressure of the molded product, to prevent the molded product from shrinking after molding, and to prevent the quality of the molded product from deteriorating. Conventionally, the pre-expanded particles after pre-expanding were left in a place with good dry air circulation, such as in a wire mesh silo, to naturally ripen over time. This aging time is at least 6 hours, usually 24 hours.
It took about an hour.
従って、人聞の予備発泡粒子を長時間収納しておける大
ぎなサイロ等の設備が必要で、設備スペースとしても非
常に広い場所が必要であった。また、発泡粒の種類等が
異なると、必要な熟成時間も変化するが、上記自然放置
による熟成では、熟成状態のコントロールが難しい欠点
があった。また、予備発泡粒子の熟成状態が変動すると
、成形工程における成形条件も変わり、成形品の品質が
バラついたり、不良品が発生し易い問題もあった。Therefore, equipment such as a large silo that can store the pre-expanded particles for a long time is required, and a very large space is required for the equipment. Furthermore, if the type of foamed grains differs, the required ripening time will also change, but the above-mentioned ripening by leaving to stand naturally has the drawback that it is difficult to control the ripening state. Further, when the ripening state of the pre-expanded particles changes, the molding conditions in the molding process also change, causing problems such as variations in the quality of molded products and the tendency to produce defective products.
しかも、成形工程のかなり前から、熟成工程を開始して
おかなければならず、成形作業全体の能率化を阻害し、
成形条件や成形品の生産量の変更等に対する融通性の点
でも劣る欠点があった。Moreover, the aging process must be started long before the molding process, which hinders the efficiency of the entire molding process.
It also had the disadvantage of being inferior in terms of flexibility with respect to changes in molding conditions and production volume of molded products.
く目的〉
そこで、この発明の目的としては、上記従来技術の欠点
を解消し、熟成工程を大幅に短縮できるとともに、熟成
状態の調整も容易で、成形作業全体の能率化および成形
コストの削減にも有効な方法を提供するものである。Therefore, the purpose of the present invention is to eliminate the drawbacks of the above-mentioned conventional techniques, to significantly shorten the ripening process, to easily adjust the ripening state, and to improve the efficiency of the entire molding operation and reduce molding costs. also provides an effective method.
く構成〉
そして、上記目的を達成するための方法としては、発泡
性熱可塑性樹脂粒子を成形型の型窩内に充填して加熱融
着させる成形方法において、発泡性熱可塑性樹脂粒子を
予備発泡させた予備発泡粒子を、熱風雰囲気下に一定時
間さらして熟成させた後、成形することを特徴としてい
る。In order to achieve the above object, the foamable thermoplastic resin particles are pre-foamed in a molding method in which the foamable thermoplastic resin particles are filled into the mold cavity of a mold and heat fused. The method is characterized in that the pre-expanded particles are exposed to a hot air atmosphere for a certain period of time to mature, and then molded.
〈実施例〉 次いで、この発明の実施例について、以下に説明する。<Example> Next, examples of the present invention will be described below.
まず、熟成工程までの発泡性熱可塑性樹脂粒子の製造工
程および予備発泡工程については、従来の成形方法と同
様の工程で実施されるので、詳細な説明は省略する。First, the manufacturing process of expandable thermoplastic resin particles up to the ripening process and the pre-foaming process are carried out in the same steps as in the conventional molding method, so detailed explanations thereof will be omitted.
そして、予備発泡工程を終了し、予備発泡機から取出さ
れた直後の予備発泡粒子に対し、熱風を吹き付け、熱風
雰囲気下にさらす。熱風の雰囲気温度とじでは、約６０
℃〜１００℃で実施する。Then, hot air is blown onto the pre-foamed particles immediately after the pre-foaming step is completed and the particles are taken out from the pre-foaming machine, and exposed to a hot air atmosphere. Approximately 60
Conducted at temperatures between 100°C and 100°C.
そして、この熱風雰囲気下に約５分〜２０分程度さらし
て、強制的に熟成を進行させる。なお、熱風の雰囲気温
度として、約６０℃以下では所望の熟成効果が生じず、
また約１００℃以上になると、発泡粒の異常な膨張が起
ったり、成形工程で融着不良を起す原因となり、何れも
不適当である。さらに、予備発泡粒子を熱風雰囲気下に
さらす時間については、５分以下の加熱時間では熟成効
果がなく、２０分以上になると融着不良を起す。Then, it is exposed to this hot air atmosphere for about 5 to 20 minutes to forcibly ripen it. Note that if the atmospheric temperature of the hot air is about 60°C or lower, the desired aging effect will not occur;
Moreover, if the temperature exceeds about 100° C., it may cause abnormal expansion of the expanded beads or poor fusion during the molding process, both of which are unsuitable. Furthermore, regarding the time period during which the pre-expanded particles are exposed to the hot air atmosphere, heating time of 5 minutes or less will not produce a maturing effect, and heating time of 20 minutes or more will result in poor fusion.
但し、予備発泡粒子の種類や品質、あるいは熟成後の成
形条件箸に応じて、熱風雰囲気の温度および熟成時間は
上記範囲内で自由に設定するものとする。However, the temperature of the hot air atmosphere and the aging time may be freely set within the above range depending on the type and quality of the pre-expanded particles or the molding conditions after aging.
なお、上記に説明した熟成工程は、予備発泡粒子を収容
する加熱トンネル等の収容部、加熱ヒーター、送風機等
を備え、予備発泡粒子を加熱トンネル等に収納した状態
で、トンネル内に熱風を送風自在に構成した熟成装置に
て行う。The above-mentioned aging process includes a storage part such as a heating tunnel for storing the pre-expanded particles, a heating heater, an air blower, etc., and hot air is blown into the tunnel with the pre-expanded particles stored in the heating tunnel etc. This is done using a freely configured aging device.
以上のようにして、熟成工程を終えた予備発泡粒子は、
直ちに成形工程に供することができる。The pre-expanded particles that have undergone the aging process as described above are
It can be immediately subjected to a molding process.
なお、この成形工程についても、従来の成形方法と同様
であるので、詳細な説明は省略する。Note that this molding process is also similar to the conventional molding method, so detailed explanation will be omitted.
なお、この発明で使用する発泡性熱可塑性樹脂としては
、ポリスチレン、ポリエチレン、ポリプロピレンその他
の通常の各種熱可塑性樹脂からなる発泡樹脂が自由に使
用でき、発泡樹脂の種類や発泡倍率あるいは比重等の諸
性質によって、熟成時間や熱風温度を適宜設定して実施
する。As the foamable thermoplastic resin used in this invention, foamed resins made of polystyrene, polyethylene, polypropylene, and other ordinary thermoplastic resins can be freely used, and various factors such as the type of foamed resin, expansion ratio, and specific gravity can be used. Depending on the nature, the ripening time and hot air temperature are set appropriately.
また実施上、この発明の熱風による熟成工程と従来の自
然放置による熟成工程とを併用することもでき、例えば
、予備発泡後の予備発泡粒子を一定時間自然放置した後
、熟成の最終段階で、この発明の熱風による熟成工程を
行えば、従来の自然放置のみによる熟成方法における、
熟成状態のバラツキや成形条件の不安定さを改善でき、
成形に使用する予備発泡粒子全体の品質を一定にできる
。In addition, in practice, it is possible to use the hot air aging process of the present invention and the conventional natural aging process in combination. For example, after pre-foamed particles are left to naturally stand for a certain period of time, in the final stage of ripening, If the hot air aging process of this invention is carried out, compared to the conventional aging method of leaving it alone,
It can improve the variation in ripening state and the instability of molding conditions,
The quality of the entire pre-expanded particles used for molding can be made constant.
さらに、従来のように、予備発泡粒子の品質のバラツキ
を調整するために、成形サイクル中の加熱冷却工程等で
の余裕時間を設けて作業を行う必要がなくなり、成形サ
イクル全体のサイクルアップにも非常に有効である。Furthermore, unlike in the past, it is no longer necessary to provide extra time during the heating and cooling process during the molding cycle in order to adjust the quality variation of pre-expanded particles, which helps improve the overall molding cycle. Very effective.
〈効果〉
以上のように構成された、この発明の成形方法によれば
、従来の自然放置による熟成に代え、熱風雰囲気下での
強制的な熟成を行うことにより、熟成時間の大幅な短縮
を実現することが出来たのである。即ち、熱風雰囲気に
よって、予備発泡粒子を自然状態よりも、はる・かに高
温で乾燥した状態に置くことができ、熟成が極めて迅速
に進行するので、自然放置で６時間以上かかつていた熟
成が、わずか約２０分以下で完了することになるのであ
る。<Effects> According to the molding method of the present invention configured as described above, the ripening time can be significantly shortened by performing forced ripening in a hot air atmosphere instead of the conventional ripening by leaving it to naturally. We were able to make it happen. In other words, the hot air atmosphere allows the pre-expanded particles to be kept in a dry state at a much higher temperature than in their natural state, allowing ripening to proceed extremely quickly, making it possible to ripen particles that used to take more than 6 hours when left alone. However, it can be completed in just about 20 minutes or less.
従って、熟成工程における作業時間の大幅な短縮が可能
になり、発泡成形全体の能率化にも大きく貢献できるも
のである。Therefore, it is possible to significantly shorten the working time in the aging process, and it can greatly contribute to increasing the efficiency of the entire foam molding process.
そして、上記のように、熟成時間を大幅に短縮できるこ
とによって、従来のように成形工程の長時間前から熟成
を準備をして、成形工程開始のタイミングに合せなくて
も、成形工程開始の直前に熟成工程を行えば充分であり
、成形スケジュールの変更や成形品の需要増減にも迅速
に対応できる、融通性に優れた方法である。また、熟成
中の予備発泡粒子を大量に長時間放置収納しておくため
の、大きな熟成用サイロを設置しなくともよいので、設
備費と設備スペースの大幅な削減を可能にできた。しか
も、従来、可燃性物質である予備発泡粒子を長時間大量
に放置しておく為に必要であった、安全性確保のための
保守管理の手間や設備もかからず、熟成用の熱風装置を
設置するスペースとコストのみでよいので、設備費およ
びランニングコストは、従来に比べて、はるかに安価に
実施できるものである。As mentioned above, by significantly shortening the aging time, you do not have to prepare for aging for a long time before the molding process and adjust it to the timing of the start of the molding process, but just before the start of the molding process. It is sufficient to carry out the aging process at the same time, and it is a highly flexible method that can quickly respond to changes in molding schedules and changes in demand for molded products. Additionally, there is no need to install a large maturing silo for storing a large amount of pre-expanded particles for a long period of time, making it possible to significantly reduce equipment costs and equipment space. In addition, there is no need for maintenance and equipment to ensure safety, which was previously required to leave large quantities of pre-expanded particles, which are flammable substances, for long periods of time, and there is no need for a hot air system for aging. Since only the space and cost required for installation are required, equipment costs and running costs are much lower than in the past.
次に、従来の自然放置の場合、成形工程の開始と熟成工
程との時間的タイミングによって熟成時間にかなりのバ
ラツキが生じ、また温度や湿度等の環境条件によっても
予備発泡粒子の品質にバラツキが生じるので、そのため
に発泡圧力や寸法安定性等の成形条件がかわってしまい
、成形品の品質が一定せず、不良品発生の原因になって
いたが、この発明の方法であれば、熱風の温度と時間と
を容易に管理でき、環境条件にも左右されないので、成
形工程に供される発泡粒は極めて品質の安定したものと
なり、成形品の品質向上にも優れた効果がある。また、
成形工程と熟成工程とのタイミングを調整するための余
計なロスタイムも不要であるから、成形作業全体のサイ
クルアップにも効果があり、成形能率の向上にも貢献で
きる。Next, in the case of conventional natural aging, there is considerable variation in the aging time due to the timing between the start of the molding process and the aging process, and the quality of the pre-expanded particles also varies depending on environmental conditions such as temperature and humidity. This caused changes in molding conditions such as foaming pressure and dimensional stability, resulting in inconsistent quality of molded products and the occurrence of defective products. Since temperature and time can be easily controlled and it is not affected by environmental conditions, the quality of the foamed beads used in the molding process is extremely stable, and it is also effective in improving the quality of molded products. Also,
Since there is no need for extra loss time for adjusting the timing between the molding process and the aging process, it is effective in increasing the cycle of the entire molding operation and can also contribute to improving molding efficiency.
以上のように、熟成工程の能率を向上し、成形工程に供
する予備発泡粒子の品質を向上できることによって、成
形工程全体の能率化および成形品の品質向上にも大きく
貢献できる優れた効果を発揮できるものである。As described above, by improving the efficiency of the aging process and improving the quality of the pre-expanded particles used in the molding process, it is possible to achieve excellent effects that can greatly contribute to streamlining the entire molding process and improving the quality of molded products. It is something.
〈実験例〉
上記効果を実証するために、従来の自然放置による熟成
工程、およびこの発明の熱風による熟成工程を行った予
備発泡粒子を使用して成形工程を実施し、成形品の品質
を比較した結果を以下に示す。<Experimental example> In order to verify the above effects, a molding process was carried out using pre-expanded particles that had been subjected to the conventional aging process by leaving them in nature and the hot air aging process of this invention, and the quality of the molded products was compared. The results are shown below.
（実験 １）
１１３００Ｘ横３００×厚さ２５馴の厚板状の成形品を
、ポリスチレン発泡ビーズを用いて成形した。(Experiment 1) A plate-like molded product measuring 11,300 x 300 x 25 mm thick was molded using polystyrene foam beads.
上記ビーズを嵩倍数約５０倍に予備発泡させたものに対
して、従来の熟成工程およびこの発明の熟成工程におけ
る、適正な熟成時間を求めた。成形に使用した成形機は
、ＡＣＥ−１１ＱＳ型成形磯（積水工機製）であり、そ
の結果を下表に示１゜以下余白
成形収縮 ：成形後に収縮がない良品が得られる為の熟
成時間
発泡圧力 ：成形時の発泡圧力が安定する為の熟成時間
寸法安定 ：成形品の寸法が安定する為の熟成時間
総 合 ：大川上使用可能な状態になるまでの熟成時
間
なお、実験例では予備発泡後、熟成および成形工程まで
移動するのに約３０弁型する為に、３０分以内での実験
は行っていないが、熟成後直らに成形を行っても、良好
な結果が得られる。Appropriate maturing times in the conventional maturing process and the maturing process of the present invention were determined for the beads that had been pre-foamed to a volume multiple of about 50 times. The molding machine used for molding was an ACE-11QS molding iso (manufactured by Sekisui Koki), and the results are shown in the table below. Margin molding shrinkage of 1° or less: Aging time foaming to obtain a good product with no shrinkage after molding. Pressure: Aging time to stabilize the foaming pressure during molding Dimensional stability: Aging time to stabilize the dimensions of the molded product Overall: Aging time to reach a usable state Note that in the experimental example, pre-foaming After that, it takes about 30 valves to move to the ripening and molding process, so we have not conducted experiments within 30 minutes, but good results can be obtained even if molding is performed immediately after ripening.
以上のように、熱風で強制的に熟成することによって、
熟成時間が大幅に短縮されることが確認できた。As mentioned above, by forced ripening with hot air,
It was confirmed that the aging time was significantly shortened.
（実験 ２）
、ヒ記実験と同一の発泡ビーズおよび成形品で、約２４
時間自然熟成したものを、さらに熱風で強制熟成し、成
形サイクルについて比較した。(Experiment 2), using the same foamed beads and molded products as in the experiment described in
Those that had been naturally aged for a few hours were further forcedly aged with hot air, and the molding cycles were compared.
表 ２
以上のように、従来の自然熟成とこの発明の熱風による
強ａ、ＩＩ熟成とを併用することによって、成形ナイク
ルを大幅に短縮できることが確認できた。Table 2 As shown above, it was confirmed that the molding time could be significantly shortened by using the conventional natural aging together with the strong a, II aging using hot air according to the present invention.
Claims (1)
雰囲気下で熟成させる上記特 許請求の範囲第１項記載の発泡樹脂の成 形方法。 ４、発泡性熱可塑性樹脂粒子を予備発泡後、一旦自然放
置して熟成した後、熱風雰囲 気下に一定時間さらして熟成完了させる 上記特許請求の範囲第１項記載の発泡樹 脂の成形方法。[Claims] 1. In a molding method in which expandable thermoplastic resin particles are filled into a mold cavity of a mold and heat-fused, the pre-expanded particles are heated with hot air. A method for molding foamed resin, which involves exposing it to an atmosphere for a certain period of time to ripen it, and then molding it. 2. The method for molding a foamed resin according to claim 1, wherein the hot air atmosphere is a hot air temperature of 60 to 100°C and a maturing time of 5 to 20 minutes. 3. The method for molding a foamed resin according to claim 1, wherein the foamable thermoplastic resin particles are aged in a hot air atmosphere immediately after pre-foaming. 4. The method for molding a foamed resin according to claim 1, wherein the foamable thermoplastic resin particles are pre-foamed, left to ripen naturally, and then exposed to a hot air atmosphere for a certain period of time to complete the ripening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59237931A JPS61116526A (en) | 1984-11-12 | 1984-11-12 | Molding process of foaming resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59237931A JPS61116526A (en) | 1984-11-12 | 1984-11-12 | Molding process of foaming resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61116526A true JPS61116526A (en) | 1986-06-04 |
Family
ID=17022573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59237931A Pending JPS61116526A (en) | 1984-11-12 | 1984-11-12 | Molding process of foaming resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61116526A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01249408A (en) * | 1988-03-31 | 1989-10-04 | Kanegafuchi Chem Ind Co Ltd | Method for conveying and curing thermoplastic resin prefoamed particle with hot air |
| JPH0342212A (en) * | 1989-07-10 | 1991-02-22 | Dainippon Ink & Chem Inc | Method for ageing foamable styrene resin particle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4942913A (en) * | 1972-09-04 | 1974-04-23 | ||
| JPS51129468A (en) * | 1975-05-07 | 1976-11-11 | Hitachi Chemical Co Ltd | Method of continuously prefoaming foaming polystyrene beads |
| JPS5646735A (en) * | 1979-09-25 | 1981-04-28 | Japan Styrene Paper Co Ltd | Freparation of polyolefin series resin foamed molding body |
-
1984
- 1984-11-12 JP JP59237931A patent/JPS61116526A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4942913A (en) * | 1972-09-04 | 1974-04-23 | ||
| JPS51129468A (en) * | 1975-05-07 | 1976-11-11 | Hitachi Chemical Co Ltd | Method of continuously prefoaming foaming polystyrene beads |
| JPS5646735A (en) * | 1979-09-25 | 1981-04-28 | Japan Styrene Paper Co Ltd | Freparation of polyolefin series resin foamed molding body |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01249408A (en) * | 1988-03-31 | 1989-10-04 | Kanegafuchi Chem Ind Co Ltd | Method for conveying and curing thermoplastic resin prefoamed particle with hot air |
| JPH0342212A (en) * | 1989-07-10 | 1991-02-22 | Dainippon Ink & Chem Inc | Method for ageing foamable styrene resin particle |
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