JPH0611512B2 - Method and apparatus for continuously producing foam sheet - Google Patents
Method and apparatus for continuously producing foam sheetInfo
- Publication number
- JPH0611512B2 JPH0611512B2 JP61141423A JP14142386A JPH0611512B2 JP H0611512 B2 JPH0611512 B2 JP H0611512B2 JP 61141423 A JP61141423 A JP 61141423A JP 14142386 A JP14142386 A JP 14142386A JP H0611512 B2 JPH0611512 B2 JP H0611512B2
- Authority
- JP
- Japan
- Prior art keywords
- extruder
- gas
- organic compound
- foamed sheet
- mixed
- 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
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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/29—Feeding the extrusion material to the extruder in liquid form
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/295—Feeding the extrusion material to the extruder in gaseous form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、汎用ポリスチレン等の熱可塑性樹脂の発泡シ
ートの連続的製造方法及び製造装置に関する。TECHNICAL FIELD The present invention relates to a continuous production method and production apparatus for a foamed sheet of a thermoplastic resin such as general-purpose polystyrene.
［従来の技術］ 従来、発泡倍率が５〜２０倍の発泡シートを連続して製
造するには押出機で樹脂を溶融せしめたところに低沸点
有機化合物を注入する方法が一般的であり、低沸点有機
化合物を注入する装置として押出機内の樹脂圧力より勝
る圧力を発生する昇圧ポンプを使用することが当業界で
はよく知られている。[Prior Art] Conventionally, in order to continuously produce a foamed sheet having an expansion ratio of 5 to 20 times, a method of injecting a low boiling point organic compound into a place where a resin is melted by an extruder is generally used. It is well known in the art to use a step-up pump that generates a pressure exceeding the resin pressure in the extruder as a device for injecting a boiling organic compound.
しかしながら、低沸点有機化合物を注入して製造した発
泡シートは、例えばポリスチレンの発泡シートは使用可
能となるまでの養生時間が必要であり、この養生時間内
における発泡シートは、熱変形温度が低下したり、二次
成型した物の強度が不足する問題点を有している。ま
た、この養生時間が数日間を要して在庫費等がかさむ問
題点も有している。However, a foamed sheet produced by injecting a low-boiling organic compound, for example, a polystyrene foamed sheet requires a curing time until it becomes usable, and the foamed sheet within this curing time has a lower heat distortion temperature. In addition, there is a problem that the strength of the secondary molded product is insufficient. Further, there is a problem that this curing time requires several days and the inventory cost is high.
また、化学発泡剤を併用して低沸点有機化合物の注入量
を減らす方法もあるが、化学発泡剤から発生する気体の
有効使用量が乏しい為その効果は乏しい。There is also a method of reducing the injection amount of the low boiling point organic compound by using a chemical foaming agent together, but its effect is poor because the effective amount of gas generated from the chemical foaming agent is small.
［問題点を解決する為の手段］ 本発明者らは、前述した状況下に連続的に発泡シートを
製造する方法を鋭意研究した結果、低沸点有機化合物と
不活性なガスの混合した発泡剤を使用することが有効で
あることを見出し、本発明を完成するに至った。[Means for Solving Problems] The inventors of the present invention have earnestly studied a method for continuously producing a foamed sheet under the above-mentioned circumstances, and as a result, have found that a foaming agent in which a low-boiling organic compound and an inert gas are mixed is used. It was found that it was effective to use, and the present invention was completed.
即ち、本発明に係る発泡シートの製造方法は、押出機の
中で溶融されている熱可塑性樹脂に発泡剤を混合せし
め、これを押出機先端に取り付けられた金型を通して大
気中に放出して発泡シートを連続的に製造する方法にお
いて、低沸点有機化合物と不活性な気体とを、該低沸点
有機化合物が液体状である段階で、気液混合ミキサーに
より混合し、次いで、この混合物を熱可塑性樹脂が溶融
されている押出機に注入すること、を特徴とする。That is, in the method for producing a foamed sheet according to the present invention, a foaming agent is mixed with a thermoplastic resin melted in an extruder, and the mixture is discharged into the atmosphere through a mold attached to the tip of the extruder. In a method for continuously producing a foamed sheet, a low boiling point organic compound and an inert gas are mixed by a gas-liquid mixing mixer at a stage where the low boiling point organic compound is in a liquid state, and then the mixture is heated. It is injected into an extruder in which a plastic resin is melted.
また、本発明に係る発泡シートの連続的製造装置は、
発泡剤が混合された熱可塑性樹脂を、押出機先端に取り
付けられた金型を通して大気中に放出して発泡シートを
連続的に製造する装置において、発泡剤となる低沸点有
機化合物と不活性な気体のそれぞれの注入装置が並列し
て設置され、低沸点有機化合物と不活性な気体がそれぞ
れに独立して計量された後、気液混合ミキサーにより混
合される部分を有して押出機に接続されてなること、
不活性な気体の注入装置が、該気体を一定の圧力に保持
するユニットと一定の流量に制御するユニットから構成
されてなること、をそれぞれ特徴とする。Further, the continuous manufacturing apparatus of the foamed sheet according to the present invention,
In a device for continuously producing a foamed sheet by releasing a thermoplastic resin mixed with a foaming agent into the atmosphere through a mold attached to the tip of an extruder, it is inert with a low boiling point organic compound which becomes a foaming agent. Each gas injection device is installed in parallel, and the low-boiling organic compound and the inert gas are individually measured and connected to the extruder with a part to be mixed by the gas-liquid mixing mixer. What has been done,
The inert gas injecting device is configured by a unit that holds the gas at a constant pressure and a unit that controls the gas at a constant flow rate.
本発明でいう熱可塑性樹脂とは汎用ポリスチレン，耐衝
撃性ポリスチレン，スチレン共重合体，例えば、スチレ
ン−アクリロニトリル，アクリロニトリル−ブタジエン
−スチレン，無水マレイン酸−スチレン，メタクリル酸
−スチレン，及び、メタクリル酸メチル−スチレン等の
ポリスチレン系の樹脂に好適であるが、ポリオレフィン
類，例えば低密度及び高密度ポリエチレン，ポリプロピ
レン，ポリ塩化ビニル等にも適用できる。The thermoplastic resin referred to in the present invention includes general-purpose polystyrene, impact-resistant polystyrene, styrene copolymers such as styrene-acrylonitrile, acrylonitrile-butadiene-styrene, maleic anhydride-styrene, methacrylic acid-styrene, and methyl methacrylate. -Suitable for polystyrene resins such as styrene, but also applicable to polyolefins such as low and high density polyethylene, polypropylene, polyvinyl chloride and the like.
又、本発明でいう低沸点有機化合物とは、プロパン，ブ
アン，ペンタン，ヘキサンや石油エーテル等の炭化水素
化合物や、フレオン−１１，フレオン−１２，フレオン
−１１３，フレオン−１１４，クロロホルム，メチルク
ロライド，メチレンクロライド等のハロゲン化炭化水素
化合物等が代表的であり、特に炭化水素系及びフッ素系
の化合物が好ましい。The low boiling point organic compound as used in the present invention means a hydrocarbon compound such as propane, guan, pentane, hexane and petroleum ether, Freon-11, Freon-12, Freon-113, Freon-114, chloroform, methyl chloride. , Halogenated hydrocarbon compounds such as methylene chloride are typical, and hydrocarbon compounds and fluorine compounds are particularly preferable.
本発明でいう不活性な気体とは窒素，二酸化炭素やアル
ゴン等が代表的である。Typical examples of the inert gas in the present invention are nitrogen, carbon dioxide, argon and the like.
次に、本発明に係る発泡シートの連続的製造方法を説明
する。Next, a continuous method for producing a foamed sheet according to the present invention will be described.
ホッパーより送入された樹脂は押出機で加熱溶融され、
低沸点有機化合物と不活性な気体はそれぞれ独立に計量
され、通常モル比率で９５：５〜２０：８０程度に程度
の比率に調整され、気液混合ミキサーにより混合され、
次いで、押出機内に注入される。混合された発泡剤は樹
脂１００ｇに対して０．０１〜０．２０ｍｏｌの割合で
使用することが好ましい。The resin sent from the hopper is heated and melted by the extruder,
The low-boiling-point organic compound and the inert gas are independently weighed, usually adjusted to a molar ratio of about 95: 5 to 20:80, and mixed by a gas-liquid mixing mixer.
Then, it is injected into the extruder. The mixed foaming agent is preferably used in a ratio of 0.01 to 0.20 mol with respect to 100 g of the resin.
なお、不活性な気体の混合比率が大きい場合、低沸点有
機化合物と不活性な気体の混合された発泡剤は多く使用
される。When the mixing ratio of the inert gas is large, the foaming agent in which the low boiling point organic compound and the inert gas are mixed is often used.
不活性な気体を混合しても通常の押出機や金型が使用で
きるが、押出時の粘度が低下する為、発泡体の表面が荒
れ易くなるので押出温度を下げたり、樹脂圧力を維持す
ることが好ましい。Even if an inert gas is mixed, a normal extruder or mold can be used, but since the viscosity during extrusion decreases, the surface of the foam tends to become rough, so the extrusion temperature is lowered and the resin pressure is maintained. It is preferable.
次に、本発明に係る発泡シートの連続的製造装置を説明
する。Next, an apparatus for continuously producing a foamed sheet according to the present invention will be described.
第１図は、本発明に係る発泡シートの連続的製造装置の
代表的な実施例の一部を示したものであって低沸点有機
化合物と不活性な気体が混合した後押出機内に注入され
る態様を示している。FIG. 1 shows a part of a typical embodiment of an apparatus for continuously producing a foamed sheet according to the present invention, in which a low boiling point organic compound and an inert gas are mixed and then injected into an extruder. Is shown.
押出機１のホッパーより樹脂とセル調整剤等が送入さ
れ、樹脂が押出機１により加熱溶融されたところに低沸
点有機化合物と不活性な気体の混合した発泡剤が注入さ
れる。A resin, a cell adjuster and the like are fed from the hopper of the extruder 1, and when the resin is heated and melted by the extruder 1, a foaming agent in which a low boiling point organic compound and an inert gas are mixed is injected.
低沸点有機化合物はボンベ２より注入ポンプ３に輸送さ
れ、該注入ポンプ３で樹脂圧力より高い圧力に昇圧さ
れ、液体の状態で保持される。The low boiling point organic compound is transported from the cylinder 2 to the injection pump 3, where it is pressurized to a pressure higher than the resin pressure and held in a liquid state.
また押出機１に注入する流量は注入ポンプ３の単位時間
当たりのプランジャー可動容積で制御したり、一定の圧
力に昇圧した低沸点有機化合物をタンクに溜め、該タン
クから押出機１に注入する配管中に流量計と連動する調
整弁を設置し調整弁の開度で制御したりするが、好まし
くは後者の方法である。Further, the flow rate to be injected into the extruder 1 is controlled by the movable volume of the plunger of the injection pump 3 per unit time, or the low-boiling-point organic compound whose pressure is increased to a certain pressure is stored in a tank and injected into the extruder 1 from the tank. A regulating valve interlocking with a flow meter is installed in the pipe and controlled by the opening of the regulating valve, but the latter method is preferable.
不活性な気体を低沸点有機化合物に混合して押出機１に
注入するには、通常高圧気体を貯蔵するリザーバータン
ク４からなるユニットと気体の流量を制御する圧力調整
弁５、流量検出器６と流量調整弁７からなるユニットが
用いられ、また、液化しやすい気体、例えば炭酸ガスを
使用する場合、配管及び配管中の各機器を該気体が液化
しない温度に維持する温度調整器が必要である。In order to mix the inert gas with the low boiling point organic compound and inject it into the extruder 1, a unit consisting of a reservoir tank 4 which normally stores a high pressure gas, a pressure adjusting valve 5 for controlling the flow rate of the gas, and a flow rate detector 6 are provided. And a flow rate adjusting valve 7 are used, and when a gas that easily liquefies, for example, carbon dioxide gas is used, a temperature controller that keeps the pipe and each device in the pipe at a temperature at which the gas does not liquefy is required. is there.
リザーバータンク４に貯蔵した高圧気体は、発泡剤とし
て使用されるにつれて圧力は低下し、樹脂圧力を下まわ
ると注入できなくなる。The pressure of the high-pressure gas stored in the reservoir tank 4 decreases as it is used as a foaming agent, and cannot be injected when the pressure of the resin is lowered.
この為、リザーバータンク４を所定の圧力以上維持する
目的で昇圧ポンプを設置することが好ましく、リザーバ
ータンク４内の圧力は、通常発泡剤が注入される押出機
部分での樹脂圧力より５〜１００Kg／cm2高く設定され
ることが望ましい。For this reason, it is preferable to install a booster pump for the purpose of maintaining the reservoir tank 4 at a predetermined pressure or more, and the pressure in the reservoir tank 4 is usually 5 to 100 kg more than the resin pressure in the extruder portion into which the foaming agent is injected. It is desirable to set it higher / cm 2 .
リザーバータンク４に貯蔵した高圧気体は、圧力調整弁
５によって低沸点有機化合物と一定の圧力差を保持しつ
つ流量検出器６を通過する気体量に応じ流量調整弁７の
開度を制御して低沸点有機化合物に合流され、気液混合
ミキサーにより混合される。The high pressure gas stored in the reservoir tank 4 is controlled by the pressure control valve 5 while maintaining a constant pressure difference with the low boiling point organic compound, and the opening degree of the flow control valve 7 is controlled according to the amount of gas passing through the flow rate detector 6. It is merged with the low boiling point organic compound and mixed by a gas-liquid mixing mixer.
又、低沸点有機化合物と不活性な気体を均一に混合して
から樹脂に注入し、均一なセル、均一な発泡倍率のシー
トを製造する目的でミキサー８を押出機までの配管中に
設置するのが推奨される。なお、このミキサー８として
は、気液体混合が行なえるならば何でもよく、例えばス
タティックミキサーがあげられる。In addition, the low boiling point organic compound and the inert gas are uniformly mixed and then injected into the resin, and the mixer 8 is installed in the pipe to the extruder for the purpose of producing a sheet having a uniform cell and a uniform expansion ratio. Is recommended. Any mixer can be used as the mixer 8 as long as it can mix gas and liquid, and for example, a static mixer can be used.
［発明の効果］ 本発明によると熱可塑性樹脂に混合する低沸点有機化合
物が削減でき、また、製造した発泡シートの物性は押出
後短い時間でも低沸点有機化合物の影響が少なく、養生
期間が大幅に短縮できる。EFFECTS OF THE INVENTION According to the present invention, the low boiling point organic compound mixed in the thermoplastic resin can be reduced, and the physical properties of the produced foamed sheet are little affected by the low boiling point organic compound even after a short time after extrusion, and the curing period is significantly long. Can be shortened to
更に不活性な気体が使用されると、セルが微細化される
ことも本発明の特徴であり、従来セルを微細にする目的
で添加していた無機物や化学発泡剤を大幅に削減して
も、セルの微細な発泡シートが得られる。この為、従来
この様な無機物や化学発泡剤が原因であると推定される
発泡シートの不均一性や押出機先端に取付た金型の汚れ
及びそれに伴う不良も大幅に減った。It is also a feature of the present invention that the cell is miniaturized when an inert gas is used, and even if the inorganic substances and the chemical foaming agents that have been added for the purpose of refining the cell in the related art are significantly reduced. A fine foamed sheet of cells can be obtained. For this reason, the nonuniformity of the foamed sheet, which is conventionally considered to be caused by such an inorganic substance or chemical foaming agent, the stain on the die attached to the tip of the extruder, and the defects associated therewith are greatly reduced.
また、炭化水素系の低沸点有機化合物を使用する場合、
不活性な気体を混合することにより押出時の危険性を緩
和される。When using a hydrocarbon-based low-boiling organic compound,
Mixing an inert gas mitigates the risk of extrusion.
本発明では、発泡剤として低沸点有機化合物と不活性な
気体を利用するが、両者を独立して溶解樹脂中に投入す
るのではなく、気液混合ミキサーにより混合して熱可塑
性樹脂が溶融されている押出機中に投入する構成を採用
しており、気液混合ミキサーを利用しない態様に比較
し、安定した品質の発泡シートが得られる利点がある。In the present invention, a low-boiling organic compound and an inert gas are used as the foaming agent, but the two are not separately charged into the dissolved resin, but mixed by a gas-liquid mixing mixer to melt the thermoplastic resin. It has a merit that a foamed sheet of stable quality can be obtained, as compared with an embodiment in which a gas-liquid mixing mixer is not used because the composition is put into an extruder.
［実施例］ 以下、実施例にて本発明を説明する。[Examples] Hereinafter, the present invention will be described with reference to Examples.
実施例１ 第１図に示した設備において、ミキサー８として気液混
合ミキサーであるスタティックミキサーを使用し、これ
を、先端に６０mmφの環状スリットダイを取り付けた４
０mmφの押出機１に接続した設備で発泡ポリスチレンを
シート状に押し出した。Example 1 In the equipment shown in FIG. 1, a static mixer, which is a gas-liquid mixing mixer, was used as the mixer 8, and a 60 mmφ annular slit die was attached to the tip of this static mixer.
Expanded polystyrene was extruded into a sheet by a facility connected to an extruder 1 having a diameter of 0 mm.
汎用ポリスチレン１００部に対してセル調整剤としてタ
ルクを０．１部混合し、押出機で２１０℃、１５０Kg／
cm2に溶融せしめたところに、樹脂１００ｇに対し低沸
点有機化合物としてフレオン−１２、０．０２ｍｏｌと
不活性な気体として炭酸ガス０．０２ｍｏｌを混合した
発泡剤（１６５Kg／cm2）を注入して、厚み１．５mm、
密度０．０１ｇ／ccのシートを得た。0.1 part of talc was mixed as a cell conditioner with 100 parts of general-purpose polystyrene, and the mixture was heated at 210 ° C and 150 kg / m in an extruder.
When melted to cm 2 , a blowing agent (165 Kg / cm 2 ) was prepared by mixing 0.02 mol of Freon-12 as a low boiling point organic compound and 0.02 mol of carbon dioxide as an inert gas with respect to 100 g of the resin. Thickness 1.5mm,
A sheet having a density of 0.01 g / cc was obtained.
なお、フレオン−１２と炭酸ガスの混合はそれぞれ１６
５Kg／cm2、１７０Kg／cm2の圧力で注入し、またそれぞ
れの温度を２５℃、５０℃に保持した。The mixing of Freon-12 and carbon dioxide was 16 each.
5 kg / cm 2, was injected at a pressure of 170 kg / cm 2, also 25 ° C. Each temperature was maintained at 50 ° C..
この発泡シートを１０cm×１０cmの大きさに切り、９０
℃の雰囲気中に３０分放置しても体積変化量が５％未満
と極めて小さかった。Cut this foam sheet into 10 cm x 10 cm pieces and
Even when left in an atmosphere of ° C for 30 minutes, the volume change was extremely small, less than 5%.
比較例１ 実施例１と同じ設備を使用して、発泡剤にフレオン−１
２を０．０６ｍｏｌ注入して実施例１と同じ発泡ポリス
チレンシートを得た。Comparative Example 1 Using the same equipment as in Example 1, Freon-1 was used as the blowing agent.
0.06 mol of 2 was injected to obtain the same expanded polystyrene sheet as in Example 1.
この発泡ポリスチレンシートは９０℃の雰囲気下で体積
が１０％以上も変化してしまった。The volume of this expanded polystyrene sheet changed by 10% or more in the atmosphere of 90 ° C.
比較例２ 実験例１で利用した設備において、気液混合ミキサーで
あるミキサー８を利用しない外は同様の条件で発泡ポリ
スチレンのシートを押し出した。Comparative Example 2 In the equipment used in Experimental Example 1, a polystyrene foam sheet was extruded under the same conditions except that the gas-liquid mixing mixer, Mixer 8, was not used.
得られた発泡シートは、１〜２分の押出毎にシートの外
観が荒れたり良好となったりを繰り返し品質が安定しな
かった。The obtained foamed sheet was not stable in quality because the appearance of the sheet was repeatedly roughened or improved every 1 to 2 minutes of extrusion.
第１図は、本発明の低沸点有機化合物と不活性な気体の
注入装置の一例を示すフロー図である。 図面中の符号は次の通りである。 １……押出機 ２……低沸点有機化合物用ボンベ ３……低沸点有機化合物注入ポンプ ４……リザーバータンク ５……圧力調整弁 ６……流量検出器 ７……流量調整弁 ８……ミキサーFIG. 1 is a flow chart showing an example of a device for injecting a low boiling point organic compound and an inert gas according to the present invention. The reference numerals in the drawings are as follows. 1 ... Extruder 2 ... Cylinder for low boiling point organic compound 3 ... Low boiling point organic compound injection pump 4 ... Reservoir tank 5 ... Pressure adjusting valve 6 ... Flow rate detector 7 ... Flow rate adjusting valve 8 ... Mixer
───────────────────────────────────────────────────── フロントページの続き (72)発明者 津嶋 敬章 神奈川県鎌倉市台４−５−45 (56)参考文献 特開 昭58−136631（ＪＰ，Ａ) 特開 昭60−31538（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keisho Tsushima 4-5-45, Kamakura City, Kanagawa Prefecture (56) References JP 58-136631 (JP, A) JP 60-31538 (JP, A) )
Claims (3)
に発泡剤を混合せしめ、これを押出機先端に取り付けら
れた金型を通して大気中に放出して発泡シートを連続的
に製造する方法において、低沸点有機化合物と不活性な
気体とを、該低沸点有機化合物が液体状である段階で、
気液混合ミキサーにより混合し、次いで、この混合物を
熱可塑性樹脂が溶融されている押出機に注入することを
特徴とする発泡シートの連続的製造方法。1. A foaming agent is mixed with a thermoplastic resin melted in an extruder, and the mixture is discharged into the atmosphere through a mold attached to the tip of the extruder to continuously produce a foamed sheet. In the method, the low-boiling organic compound and an inert gas are mixed at a stage where the low-boiling organic compound is in a liquid state,
A continuous method for producing a foamed sheet, which comprises mixing with a gas-liquid mixer and then injecting the mixture into an extruder in which a thermoplastic resin is melted.
機先端に取り付けられた金型を通して大気中に放出して
発泡シートを連続的に製造する装置において、発泡剤と
なる低沸点有機化合物と不活性な気体のそれぞれの注入
装置が並列して設置され、低沸点有機化合物と不活性な
気体がそれぞれに独立して計量された後、気液混合ミキ
サーにより混合される部分を有して押出機に接続されて
なることを特徴とする発泡シートの製造装置。2. A low-boiling organic compound which serves as a foaming agent in an apparatus for continuously producing a foamed sheet by discharging a thermoplastic resin mixed with a foaming agent into the atmosphere through a mold attached to the tip of an extruder. Injectors for the compound and the inert gas are installed in parallel, and the low-boiling organic compound and the inert gas are independently weighed, and then mixed by the gas-liquid mixing mixer. A foamed sheet manufacturing apparatus, which is connected to an extruder.
の圧力に保持するユニットと一定の流量に制御するユニ
ットから構成されてなる特許請求範囲第２項記載の発泡
シートの製造装置。3. An apparatus for producing a foamed sheet according to claim 2, wherein the inert gas injecting device comprises a unit for holding the gas at a constant pressure and a unit for controlling the gas at a constant flow rate. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61141423A JPH0611512B2 (en) | 1986-06-19 | 1986-06-19 | Method and apparatus for continuously producing foam sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61141423A JPH0611512B2 (en) | 1986-06-19 | 1986-06-19 | Method and apparatus for continuously producing foam sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62299322A JPS62299322A (en) | 1987-12-26 |
| JPH0611512B2 true JPH0611512B2 (en) | 1994-02-16 |
Family
ID=15291648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61141423A Expired - Fee Related JPH0611512B2 (en) | 1986-06-19 | 1986-06-19 | Method and apparatus for continuously producing foam sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0611512B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3921523C1 (en) * | 1989-06-30 | 1990-10-31 | Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover, De | |
| BE1012801A3 (en) * | 1999-07-27 | 2001-03-06 | Solvay | Method for introduction of at least one chemical compound in an extruder device introduction, extruder equipped with such a device and methods using the extruder. |
| PL208104B1 (en) | 2003-10-31 | 2011-03-31 | Prysmian Cavi Sistemi Energia | Method and plant for the introduction of a liquid into a molten mass under pressure |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4344710A (en) * | 1980-06-10 | 1982-08-17 | Mobil Oil Corporation | Polymer foam extrusion system |
| US4424287A (en) * | 1980-06-10 | 1984-01-03 | Mobil Oil Corporation | Polymer foam process |
| JPS58136631A (en) * | 1982-02-08 | 1983-08-13 | Kanegafuchi Chem Ind Co Ltd | Production of expanded propylene resin particle |
| FR2560064A1 (en) * | 1984-02-29 | 1985-08-30 | Air Liquide | PROCESS FOR OBTAINING SOLUTIONS WITH HIGH GAS CONTENT, SOLUTIONS OBTAINED AND INSTALLATION FOR IMPLEMENTATION |
-
1986
- 1986-06-19 JP JP61141423A patent/JPH0611512B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62299322A (en) | 1987-12-26 |
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