JPH0427519A - Manufacture of polystyrene resin foamed sheet - Google Patents
Manufacture of polystyrene resin foamed sheetInfo
- Publication number
- JPH0427519A JPH0427519A JP2133284A JP13328490A JPH0427519A JP H0427519 A JPH0427519 A JP H0427519A JP 2133284 A JP2133284 A JP 2133284A JP 13328490 A JP13328490 A JP 13328490A JP H0427519 A JPH0427519 A JP H0427519A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- polystyrene resin
- temperature
- extruded
- resin
- 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.)
- Granted
Links
- 229920005990 polystyrene resin Polymers 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 229920005989 resin Polymers 0.000 claims abstract description 25
- 239000011347 resin Substances 0.000 claims abstract description 25
- 238000001125 extrusion Methods 0.000 claims abstract description 12
- 239000011342 resin composition Substances 0.000 claims abstract description 11
- 239000006260 foam Substances 0.000 claims description 15
- 239000004604 Blowing Agent Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 2
- 238000004898 kneading Methods 0.000 claims description 2
- 238000003303 reheating Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 21
- 238000010438 heat treatment Methods 0.000 abstract description 13
- 239000004088 foaming agent Substances 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 3
- 229920013716 polyethylene resin Polymers 0.000 abstract 2
- 238000010276 construction Methods 0.000 abstract 1
- 230000001815 facial effect Effects 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 15
- 238000007664 blowing Methods 0.000 description 10
- 238000005187 foaming Methods 0.000 description 8
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 229920006026 co-polymeric resin Polymers 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000001273 butane Substances 0.000 description 2
- 239000002666 chemical blowing agent Substances 0.000 description 2
- 229920006248 expandable polystyrene Polymers 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
- 235000012149 noodles Nutrition 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- AJDIZQLSFPQPEY-UHFFFAOYSA-N 1,1,2-Trichlorotrifluoroethane Chemical compound FC(F)(Cl)C(F)(Cl)Cl AJDIZQLSFPQPEY-UHFFFAOYSA-N 0.000 description 1
- PYSRRFNXTXNWCD-UHFFFAOYSA-N 3-(2-phenylethenyl)furan-2,5-dione Chemical compound O=C1OC(=O)C(C=CC=2C=CC=CC=2)=C1 PYSRRFNXTXNWCD-UHFFFAOYSA-N 0.000 description 1
- FEIQOMCWGDNMHM-UHFFFAOYSA-N 5-phenylpenta-2,4-dienoic acid Chemical compound OC(=O)C=CC=CC1=CC=CC=C1 FEIQOMCWGDNMHM-UHFFFAOYSA-N 0.000 description 1
- 239000004156 Azodicarbonamide Substances 0.000 description 1
- 229920001890 Novodur Polymers 0.000 description 1
- 229920007962 Styrene Methyl Methacrylate Polymers 0.000 description 1
- 229920000147 Styrene maleic anhydride Polymers 0.000 description 1
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 1
- 235000019399 azodicarbonamide Nutrition 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- NEHMKBQYUWJMIP-NJFSPNSNSA-N chloro(114C)methane Chemical compound [14CH3]Cl NEHMKBQYUWJMIP-NJFSPNSNSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- PXBRQCKWGAHEHS-UHFFFAOYSA-N dichlorodifluoromethane Chemical compound FC(F)(Cl)Cl PXBRQCKWGAHEHS-UHFFFAOYSA-N 0.000 description 1
- 235000019404 dichlorodifluoromethane Nutrition 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010097 foam moulding Methods 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- -1 hexane and heptane Chemical compound 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- ADFPJHOAARPYLP-UHFFFAOYSA-N methyl 2-methylprop-2-enoate;styrene Chemical compound COC(=O)C(C)=C.C=CC1=CC=CC=C1 ADFPJHOAARPYLP-UHFFFAOYSA-N 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 229920002285 poly(styrene-co-acrylonitrile) Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は樹脂発泡シートの製造方法に関し、特に表面性
状に優れたポリスチレン系樹脂発泡シートの製造方法に
関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a foamed resin sheet, and particularly to a method for manufacturing a foamed polystyrene resin sheet with excellent surface properties.
（従来の技術）
従来より、押出発泡成形により樹脂発泡シートを製造す
ることが広く行われており、一般に、成形用ポリスチレ
ン系樹脂発泡シートは環状のダイオリフイスからチュー
ブ状に押出された後、上下に切断されることにより製造
される。このようなポリスチレン系樹脂発泡シート（以
後単に樹脂発泡シートと略す）の製造過程においては、
押出直後のチューブ状樹脂組成物が急激に体積膨張を起
こすが、この場合該チューブの円周方向の伸長により、
横断面形状が花弁状に屈曲して円形を保持し得なくなり
、多数の凹凸を生じる場合が多い。(Prior Art) Conventionally, foamed resin sheets have been widely produced by extrusion foam molding.Generally, foamed polystyrene resin sheets for molding are extruded into a tube shape from an annular die orifice, and then It is manufactured by cutting into pieces. In the manufacturing process of such polystyrene resin foam sheets (hereinafter simply referred to as resin foam sheets),
Immediately after extrusion, the tubular resin composition rapidly expands in volume, but in this case, due to the elongation of the tube in the circumferential direction,
The cross-sectional shape is bent into a petal-like shape, making it impossible to maintain a circular shape, and often resulting in a large number of irregularities.
その結果、樹脂発泡シート表面の引取方向に平行な縞模
様が発生し、得られたシートは表面性状に劣るものとな
る。As a result, a striped pattern parallel to the take-up direction occurs on the surface of the resin foam sheet, and the resulting sheet has poor surface properties.
そこで上記の問題点を解決する手段として、環状のグイ
オリフィスからチューブ状で押出し該チューブをブロー
アツプさせる過程でチューブの外面をグイオリフィスの
すぐ後方に設置したリングに接触させシートの表面を均
す方法、或いは環状のグイオリフィスから押出されたチ
ューブの表面にエアーを吹付けて急冷し、シート表面の
発泡を抑制することによって表面の凹凸を低減させる方
法などが提案されている
（発明が解決しようとする課題）
しかしながら、前記の技術によって得られた樹脂発泡シ
ートは、環状のグイオリフィスから押出された直後に樹
脂チューブに発生する凹凸を強制的に均すもの或いは低
減させるものであり、樹脂チューブに発生する凹凸を根
本的に解消させるものではなかった。従って、樹脂発泡
シートには必然的に縞模様が残存し、容器成形時の加熱
工程において該縞模様が凹凸となって顕在化し昌いとい
う欠点があった。Therefore, as a means to solve the above problem, a method is used in which the outer surface of the tube is brought into contact with a ring installed immediately behind the gouge orifice in the process of extruding it in the form of a tube from an annular gouge orifice and blowing it up, thereby leveling the surface of the sheet. Alternatively, a method has been proposed in which the surface of the tube extruded from an annular guide orifice is quenched by blowing air to suppress foaming on the sheet surface, thereby reducing surface irregularities. However, the resin foam sheet obtained by the above technique is one that forcibly smoothes or reduces the unevenness that occurs on the resin tube immediately after being extruded from the annular gas orifice. It did not fundamentally eliminate the unevenness that occurs. Therefore, a striped pattern inevitably remains in the resin foam sheet, and the striped pattern becomes uneven and becomes apparent during the heating process during container molding.
そこで本発明者らは、縞模様のないポリスチレン系樹脂
発泡シートを製造すべく鋭意研究を重ねた結果、環状の
グイオリフィスから押出された直後の樹脂チューブをブ
ローアツプする際の温度制御が極めて重要であることを
見出し本発明に到達した。The inventors of the present invention have conducted intensive research to produce a polystyrene resin foam sheet without stripes, and have found that temperature control is extremely important when blowing up a resin tube immediately after it has been extruded from an annular gas orifice. We discovered something and arrived at the present invention.
従って本発明の第１の目的は、縞模様がなく表面性状に
優れたポリスチレン系樹脂発泡シートを提供することに
ある。Therefore, a first object of the present invention is to provide a polystyrene resin foam sheet that is free of striped patterns and has excellent surface properties.
本発明の第２の目的は、表面性状に優れたポリスチレン
系樹脂発泡シートを製造するための方法を提供すること
にある。A second object of the present invention is to provide a method for producing a polystyrene resin foam sheet with excellent surface properties.
（課題を解決するための手段）
本発明の上記の諸口的は、ポリスチレン系樹脂を発泡剤
と共に押出機内で熔融混練し環状のダイオリフイスより
大気中に吐出することによりポリスチレン系樹脂発泡シ
ートを得る製造方法において、押出機内で発泡剤と共に
熔融混練されたポリスチレン系樹脂組成物を該ポリスチ
レン系樹脂の加熱変形温度から加熱変形温度＋３０℃の
範囲にまで冷却した後環状のダイオリフイスよりチュー
ブ状で押出し次いでブローアツプさせる過程において、
押出されたチューブを押出し時の樹脂温度より１００℃
を越えない温度範囲に再加熱することを特徴とするポリ
スチレン系樹脂発泡シートの製造方法によって達成され
た。(Means for Solving the Problems) The above aspects of the present invention are to obtain a polystyrene resin foam sheet by melt-kneading polystyrene resin together with a foaming agent in an extruder and discharging it into the atmosphere from an annular die orifice. In the manufacturing method, a polystyrene resin composition melt-kneaded with a foaming agent in an extruder is cooled from the heating deformation temperature of the polystyrene resin to a heating deformation temperature +30°C, and then extruded in a tube shape from an annular die orifice. Next, in the process of blowing up,
The temperature of the extruded tube is 100℃ higher than the resin temperature at the time of extrusion.
This was achieved by a method for manufacturing a polystyrene resin foam sheet, which is characterized by reheating to a temperature range not exceeding .
以下に、本発明を順次詳細に説明する。The present invention will be explained in detail below.
本発明においては、押出機内でポリスチレン系樹脂を発
泡剤と共に熔融混練し、これを環状のグイオリフィスか
ら大気中にチューブ状に押出す。In the present invention, polystyrene resin is melt-kneaded together with a foaming agent in an extruder, and this is extruded into the atmosphere through an annular gas orifice in the form of a tube.
次いで、押出された樹脂チューブをブローアツプさせな
がら引取り、ダイの後方に設けた冷却ドラムに該チュー
ブの内面を接触させて冷却させた後切り開くことにより
発泡シートを得る。Next, the extruded resin tube is taken out while blowing up, the inner surface of the tube is brought into contact with a cooling drum provided at the rear of the die to cool it, and then cut open to obtain a foamed sheet.
本発明においては、発泡剤を含むポリスチレン系樹脂組
成物をポリスチレン系樹脂の加熱変形温度から加熱変形
温度＋３０℃の範囲にまで押出機内で冷却し、次いで環
状のグイオリフィスからチューブ状に押出す、これによ
って、押出された樹脂組成物の発泡に伴う急激な体積膨
張が抑制され、押出されたチューブの円周方向の伸長が
制御されるので、該チューブの横断面形状を円形に保持
することができる０次に、該チューブをブローアツプさ
せるに際し、チューブの横断面形状をできるだけ円形に
保持しつつ発泡を促進させる。このために、押出時の樹
脂温度より１００℃を越えない範囲で押出されたチュー
ブを段階的に加熱する。In the present invention, a polystyrene resin composition containing a foaming agent is cooled in an extruder to a range from the heating deformation temperature of the polystyrene resin to the heating deformation temperature + 30°C, and then extruded into a tube shape from an annular gouging orifice. This suppresses rapid volumetric expansion accompanying foaming of the extruded resin composition and controls the circumferential expansion of the extruded tube, making it possible to maintain the cross-sectional shape of the tube in a circular shape. Next, when blowing up the tube, foaming is promoted while keeping the cross-sectional shape of the tube as circular as possible. For this purpose, the extruded tube is heated in stages to a temperature not exceeding 100° C. above the resin temperature during extrusion.
本発明で使用されるスチレン系樹脂としては、例えば、
汎用ポリスチレン樹脂、耐衝撃性ポリスチレン樹脂、ス
チレン−アクリロニトリル共重合体樹脂、スチレン−メ
チルメタアクリレート共重合体樹脂、スチレン−アクリ
ル酸共重合体樹脂、スチレン−無水マレイン酸共重合体
樹脂、及びそれらの樹脂のブレンド物などが挙げられる
。Examples of the styrenic resin used in the present invention include:
General-purpose polystyrene resins, impact-resistant polystyrene resins, styrene-acrylonitrile copolymer resins, styrene-methyl methacrylate copolymer resins, styrene-acrylic acid copolymer resins, styrene-maleic anhydride copolymer resins, and their Examples include resin blends.
上記の如きポリスチレン系樹脂には、気泡の大きさを調
節する目的でタルク、炭酸カルシウム等の無機物を含有
せしめることができる。The polystyrene resin described above may contain inorganic substances such as talc and calcium carbonate for the purpose of controlling the size of bubbles.
本発明に使用される発泡剤は、ポリスチレン樹脂の発泡
剤として一般に用いられている物理発泡剤又は化学発泡
剤の中から適宜選択して使用することができる。物理発
泡剤としては、例えば、プロパン、ブタン、ペンタン、
ヘキサン、ヘプタン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、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を挙げることができる。The blowing agent used in the present invention can be appropriately selected from physical blowing agents or chemical blowing agents that are generally used as blowing agents for polystyrene resins. Examples of physical blowing agents include propane, butane, pentane,
Hydrocarbon compounds such as hexane and heptane, and freon-
11, Freon-12, Freon-113, Freon-
Examples include halogenated hydrocarbon compounds such as No. 114, methyl chloride, and methylene chloride.
化学発泡剤としては、例えば、アゾジカルボンアミド等
の有機系発泡剤や重炭酸塩、或いは重炭酸塩とクエン酸
などの有機酸との組合せなどを挙げることができる。Examples of the chemical blowing agent include organic blowing agents such as azodicarbonamide, bicarbonate, or a combination of bicarbonate and an organic acid such as citric acid.
本発明においては、発泡剤を含むポリスチレン系樹脂組
成物を押出様内でポリスチレン系樹脂の加熱変形温度か
ら（加熱変形温度＋３０℃）の範囲にまで冷却するが、
これは、加熱変形温度未満に冷却すると環状のダイオリ
フイスからポリスチレン系樹脂組成物が均一に吐出しな
いこと、加熱変形温度＋３０℃を越えると環状のダイオ
リフイスから吐出されたチューブ状ポリスチレン系樹脂
組成物が急激な体積膨張を起こし、該チューブの円周方
向の長さの増大によって横断面形状が花弁状に屈曲して
円形を保持し得なくなることのためである。In the present invention, a polystyrene resin composition containing a blowing agent is cooled in an extrusion mode to a range from the heating deformation temperature of the polystyrene resin to (heating deformation temperature + 30°C),
This is because the polystyrene resin composition is not uniformly discharged from the annular die orifice when cooled below the heating deformation temperature, and the tubular polystyrene resin composition is discharged from the annular die orifice when the heating deformation temperature exceeds +30°C. This is because the tube undergoes rapid volumetric expansion, and as the length of the tube increases in the circumferential direction, the cross-sectional shape bends into a petal shape and becomes unable to maintain its circular shape.
本発明においては、環状のダイオリフイスから吐出した
チューブ状ポリスチレン系樹脂組成物をブローアツプ過
程で押出し時のチューブの樹脂温度からチューブの（樹
脂温度＋１００℃）の範囲に再加熱するが、これは押出
し時のチューブの樹脂温度以下では該チューブが効果的
に体積膨張を起こし得ないことはもとより、押出し時の
チューブの樹脂温度より１００℃以上高い温度となると
該チューブが急激に体積膨張を起こし、チューブの円周
方向の長さの増大によって横断面形状が花弁状に屈曲し
て円形を保持し得なくなるためである。In the present invention, the tubular polystyrene resin composition discharged from the annular die orifice is reheated during the blow-up process to a range from the resin temperature of the tube at the time of extrusion to (resin temperature + 100°C) of the tube. It goes without saying that the tube cannot effectively expand in volume below the resin temperature of the tube at the time of extrusion, and if the temperature is 100°C or more higher than the resin temperature of the tube at the time of extrusion, the tube will rapidly expand in volume and This is because as the length in the circumferential direction increases, the cross-sectional shape becomes bent like a petal, and the circular shape cannot be maintained.
以下、本発明の内容を図面に基づいて更に説明する。Hereinafter, the content of the present invention will be further explained based on the drawings.
第１図は本発明の方法を実施するために用いることので
きるダイオリフイス回りの１例である。FIG. 1 shows an example of a die orifice that can be used to carry out the method of the present invention.
本例は、チューブのブローアツプ過程においてチューブ
を加熱するための加熱エアーの吹出し口（リング状）を
、チューブの内側（３−１ａ、３−２ａ、３−３ａ：内
エアーリングと称す、）とチューブの外側（３−１ｂ、
３−２ｂ、３−３ｂ：外エアーリングど称す、）とに引
取方向に沿って段階的に設置し且つ内エアーリングと外
エアーリングの位置を引取方向で一致させたものである
。In this example, the heated air outlet (ring-shaped) for heating the tube during the tube blow-up process is connected to the inside of the tube (3-1a, 3-2a, 3-3a: referred to as inner air ring). Outside of the tube (3-1b,
3-2b, 3-3b: outer air rings) are installed stepwise along the take-up direction, and the positions of the inner air ring and the outer air ring are aligned in the take-up direction.
発泡剤を含むポリスチレン系樹脂は図外の押出機によっ
て熔融混練され、ポリスチレン系樹脂の加熱変形温度か
ら加熱変形温度＋３０℃の範囲にまで冷却された後、ダ
イ１の環状オリフィス２からチューブ状で大気中に押出
される。押出されたチューブ５は押出機内においてポリ
スチレン系樹脂の加熱変形温度から加熱変形温度＋３０
℃の範囲にまで冷却されているため発泡による急激な体
積膨張を起こさず、そのためチューブ５の横断面形状は
円形を保持している。この状態からチューブ５は冷却タ
ンク６に向かってブローアツプを開始する。このチュー
ブのブローアツプ過程には前述のように内エアーリング
と外エアーリングとが設けてあり、更に内エアーリング
と外エアーリングから吹き出る加熱エアーがチューブの
内面と外面の円周方向に均一に当たるように調節されて
いる。チューブ５はこれらの加熱エアーの吹出し位置を
通過することにより押出時のチューブの樹脂温度からチ
ューブの（樹脂温度＋１００℃）の範囲に再加熱される
ことにより発泡を開始すると共にそれが促進される。こ
こで加熱エアーの温度は、チューブの引取方向に向かっ
て内エアーリング３−１ａ、外エアーリング３−１ｂよ
りは内エアーリング３−２ａ、外エアーリング３−２ｂ
更に内エアーリング３−３ａ、外エアーリング３−３ｂ
と段階的に順次高温度化されている。そのためチューブ
の発泡はチューブのブローアツプ過程で段階的に調節さ
れ、チューブの発泡による円周長の増大量がチューブ径
の増加で吸収される状態となるため、環状のダイオリフ
イスから押出されたチューブの横断面形状は冷却ドラム
６に至るまでの全過程において常に円形を保持し、この
状態で冷却ドラム６上で冷却エアーリング４から吹き出
ている冷却エアー等により、冷却固化される。The polystyrene resin containing a foaming agent is melt-kneaded by an extruder (not shown), cooled to a range from the heat deformation temperature of the polystyrene resin to the heat deformation temperature +30°C, and then extruded from the annular orifice 2 of the die 1 into a tube shape. Extruded into the atmosphere. The extruded tube 5 is heated to a temperature of +30 from the heat distortion temperature of the polystyrene resin in the extruder.
Since the tube 5 is cooled to a temperature range of .degree. C., rapid volumetric expansion due to foaming does not occur, and therefore the cross-sectional shape of the tube 5 maintains a circular shape. From this state, the tube 5 starts blowing up toward the cooling tank 6. In this tube blow-up process, an inner air ring and an outer air ring are provided as mentioned above, and the heated air blown from the inner air ring and outer air ring is made to uniformly hit the inner and outer surfaces of the tube in the circumferential direction. It is adjusted to. The tube 5 passes through these heated air blowing positions and is reheated to a range from the resin temperature of the tube at the time of extrusion to (resin temperature + 100°C), thereby starting and promoting foaming. . Here, the temperature of the heated air is as follows: Inner air ring 3-1a, Outer air ring 3-1b, Inner air ring 3-2a, Outer air ring 3-2b
Furthermore, the inner air ring 3-3a and the outer air ring 3-3b
The temperature is gradually increased. Therefore, the foaming of the tube is adjusted in stages during the tube blow-up process, and the increase in circumference due to the foaming of the tube is absorbed by the increase in tube diameter. The cross-sectional shape always maintains a circular shape throughout the entire process up to the cooling drum 6, and in this state, it is cooled and solidified on the cooling drum 6 by the cooling air etc. blown out from the cooling air ring 4.
以上詳述した如く、本発明の製造方法によって得られる
発泡シートは、樹脂チューブが押出されて引取られる迄
の全過程において常に円形を保持しているため、引取方
向に平行な縞模様及びその痕跡が全く認められず、表面
性状に優れたものとなる。As detailed above, the foamed sheet obtained by the manufacturing method of the present invention always maintains a circular shape during the entire process from when the resin tube is extruded to when it is taken off, so that it has striped patterns parallel to the taking direction and its traces. The surface quality is excellent.
従つて、本発明の製造方法によって得られた発泡シート
を熱成形加工によってトレーや弁当箱などの底面積の広
い容器に成形した場合でも縞模様の痕跡が認められず、
外観の非常に良好な成形品を得ることができる。更に、
カップラーメンの容器に成形した場合においても、通常
縞模様に起因してその上縁部に生ずるところの波打ちも
良られず、上蓋のヒートシール性に非常に優れた成形品
が得られる。Therefore, even when the foamed sheet obtained by the production method of the present invention is thermoformed into a container with a wide bottom area, such as a tray or lunch box, no trace of a striped pattern is observed.
A molded product with a very good appearance can be obtained. Furthermore,
Even when molded into a cup noodle container, the molded product is free from the undulations that normally occur at the upper edge due to the striped pattern, and the molded product has excellent heat-sealing properties for the top lid.
（発明の効果）
本発明の製造方法によれば、チューブの体積膨張による
円周長の増大をチューブをブローアツプさせる過程で段
階的に調節できるため、チューブの円周長の増大量がチ
ューブをブローアツプすることにより吸収される。即ち
、グイオリフィスから押出されて冷却タンクに接触する
までのチューブのブローアツプ過程においてはチューブ
の横断面形状は常に円形となるため、従来、チューブの
凹凸が原因となって住じた引取り方向に平行な縞模様が
発生しない。(Effects of the Invention) According to the manufacturing method of the present invention, the increase in circumference due to volume expansion of the tube can be adjusted stepwise during the process of blowing up the tube. It is absorbed by In other words, the cross-sectional shape of the tube is always circular during the blow-up process from when it is extruded from the cooling orifice until it contacts the cooling tank. Parallel stripes do not occur.
（実施例）
以下本発明を実施例によって更に詳述するが、本発明は
これによって限定されるものではない。(Example) The present invention will be explained in more detail below with reference to Examples, but the present invention is not limited thereto.
実施例１゜
第１図に示した設備を使用し、ポリスチレン樹脂（ＪＩ
ＳＫ−６８７１による加熱変形温度８６”Ｃ）１００重
量部とタルク０．５重量部とを混合した後２００℃に加
熱させた４０菖Φの押出機に投入し、熔融混練させた０
次いで該押出機の途中に設けた注入口からブタンを５重
量部圧入混合させた後オイル循環式の冷却機構が備わっ
ている押出機中に透しポリスチレン樹脂組成物を冷却し
、押出機の先端に取付けられた１５０腫Φの環状のオリ
フィス２から押出された直後のチューブ５０表面温度（
日本電子製サーモグラフィ装置 ＪＴＧ−３２１０型サ
ーモビエアで測定：物体から放射されている赤外線をと
らえ、表面の温度分布を定量的に測定する装置）が１０
０℃になるようにした。Example 1 Using the equipment shown in Figure 1, polystyrene resin (JI
After mixing 100 parts by weight of 0.5 parts by weight of talc with a heating deformation temperature of 86"C by SK-6871, the mixture was charged into a 40-diameter extruder heated to 200°C, and melt-kneaded.
Next, 5 parts by weight of butane was injected into the extruder through an injection port provided in the middle of the extruder, and the transparent polystyrene resin composition was cooled into an extruder equipped with an oil circulation cooling mechanism. The surface temperature of the tube 50 immediately after being extruded from the annular orifice 2 with a diameter of 150 mm (
Measured with JEOL's thermography device JTG-3210 model Thermovia: a device that captures infrared rays emitted from an object and quantitatively measures the temperature distribution on the surface) is 10
The temperature was set to 0°C.
次いで、チューブをブローアツプさせる過程に設けたエ
アーリング３−１ａ、３−１ｂから１３０℃、３−２ａ
、３−２ｂから１４０℃、更に３−３ａ、３−３ｂから
１５０℃の加熱されたエアーが吹き出ているエアーリン
グ間にチューブ５を通して加熱発泡させつつブローアツ
プさせた。Next, air rings 3-1a and 3-1b provided during the process of blowing up the tube are heated to 130°C and 3-2a
, 3-2b to 140 DEG C., and 3-3a and 3-3B to 150 DEG C. Heated air was passed through the tube 5 between the air rings to cause foaming and blow-up.
その後、２０℃に保った直径４００■の冷却ドラム６と
該冷却ドラム６の先端に設けられ２０″Ｃのエアーが吹
き出ている冷却エアーリング４との間に、冷却ドラム６
に接触させながらチューブ５を３ｍ／分の速度で引取っ
て冷却固化させ、次いで切り開いた。この様にして得ら
れた坪量２００ｇ／ボの発泡シートは幅が６３０ｍｍ、
厚さが２１であり、表面が一様で凹凸も縞模様も全く認
められない良好なものであった。Thereafter, the cooling drum 6 is placed between the cooling drum 6 with a diameter of 400 cm maintained at 20°C and the cooling air ring 4 provided at the tip of the cooling drum 6 from which air of 20"C is blown out.
The tube 5 was pulled at a speed of 3 m/min while being in contact with the tube to cool and solidify, and then cut open. The foam sheet with a basis weight of 200 g/bo obtained in this way has a width of 630 mm,
The thickness was 21 mm, and the surface was uniform with no irregularities or striped patterns.
この発泡シートは、トレーに熱成形した場合においても
縞模様が認められず外観上優れたものであり、更にカッ
プラーメンの容器に熱成形加工した場合においても、縞
模様に起因する上縁部の波打ちが全く認められず上蓋の
ヒートシール性に非常に優れたものであった。Even when this foam sheet is thermoformed into a tray, no stripes are observed and it has an excellent appearance.Furthermore, even when it is thermoformed into a cup noodle container, the upper edge of the sheet does not show the striped pattern. No waving was observed, and the heat sealability of the top lid was excellent.
第１図は本発明の詳細な説明するための断面概略図であ
る。
１ ・ ・ ・グイ、
２・・・環状オリフィス、
３−１ａ、３−２ａ、３−３ａ・・・内エアーリング、
３−１ｂ、３−２ｂ、３−３ｂ・・・外エアーリング、
冷却エアーリング
チューブ
冷却ドラム
エアー排気管
空洞FIG. 1 is a schematic cross-sectional view for explaining the present invention in detail. 1...Gui, 2...Annular orifice, 3-1a, 3-2a, 3-3a...Inner air ring, 3-1b, 3-2b, 3-3b...Outer air ring, cooling Air ring tube cooling drum air exhaust pipe cavity
Claims (1)
混練し環状のダイオリフィスより大気中に吐出すること
によりポリスチレン系樹脂発泡シートを得る製造方法に
おいて、押出機内で発泡剤と共に熔融混練されたポリス
チレン系樹脂組成物を該ポリスチレン系樹脂の加熱変形
温度から加熱変形温度＋３０℃の範囲にまで冷却した後
環状のダイオリフィスよりチューブ状で押出し次いでブ
ローアップさせる過程において、押出されたチューブを
押出し時の樹脂温度より１００℃を越えない温度範囲に
再加熱することを特徴とするポリスチレン系樹脂発泡シ
ートの製造方法。 ２）押出されたチューブの加熱が、環状のダイオリフィ
スから引取方向に向かって順次段階的に高くなる如く行
われることを特徴とする請求項１に記載の製造方法。 ３）押出されたチューブをブローアップさせた後冷却す
ることを特徴とする請求項１又は２に記載の製造方法。[Scope of Claims] 1) In a manufacturing method for obtaining a polystyrene resin foam sheet by melt-kneading polystyrene resin together with a blowing agent in an extruder and discharging the polystyrene resin foam sheet into the atmosphere from an annular die orifice, The melt-kneaded polystyrene resin composition is cooled from the heat deformation temperature of the polystyrene resin to the heat deformation temperature +30°C, extruded through an annular die orifice in a tube shape, and then blown up. A method for producing a polystyrene resin foam sheet, which comprises reheating the tube to a temperature range not exceeding 100°C from the resin temperature at the time of extrusion. 2) The manufacturing method according to claim 1, wherein the extruded tube is heated in a stepwise manner from the annular die orifice toward the withdrawal direction. 3) The manufacturing method according to claim 1 or 2, characterized in that the extruded tube is blown up and then cooled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2133284A JPH0673902B2 (en) | 1990-05-22 | 1990-05-22 | Method for producing polystyrene-based resin foam sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2133284A JPH0673902B2 (en) | 1990-05-22 | 1990-05-22 | Method for producing polystyrene-based resin foam sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0427519A true JPH0427519A (en) | 1992-01-30 |
| JPH0673902B2 JPH0673902B2 (en) | 1994-09-21 |
Family
ID=15101049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2133284A Expired - Fee Related JPH0673902B2 (en) | 1990-05-22 | 1990-05-22 | Method for producing polystyrene-based resin foam sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0673902B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5889069A (en) * | 1997-07-15 | 1999-03-30 | The Dow Chemical Company | High temperature syndiotactic styrene polymer foam |
| JP2009149050A (en) * | 2007-09-03 | 2009-07-09 | Mitsubishi Plastics Inc | Method of manufacturing polystyrene based resin made foamed biaxially stretched sheet, sheet and molded product using the sheet |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS638892A (en) * | 1986-06-30 | 1988-01-14 | 富士電機株式会社 | Sheet paper identifier |
| JPS6337916A (en) * | 1986-08-04 | 1988-02-18 | Dow Kako Kk | Manufacture of styrene-based resin foam |
| JPS63122515A (en) * | 1986-11-11 | 1988-05-26 | Sekisui Plastics Co Ltd | Manufacture of styrene resin foamed sheet |
-
1990
- 1990-05-22 JP JP2133284A patent/JPH0673902B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS638892A (en) * | 1986-06-30 | 1988-01-14 | 富士電機株式会社 | Sheet paper identifier |
| JPS6337916A (en) * | 1986-08-04 | 1988-02-18 | Dow Kako Kk | Manufacture of styrene-based resin foam |
| JPS63122515A (en) * | 1986-11-11 | 1988-05-26 | Sekisui Plastics Co Ltd | Manufacture of styrene resin foamed sheet |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5889069A (en) * | 1997-07-15 | 1999-03-30 | The Dow Chemical Company | High temperature syndiotactic styrene polymer foam |
| US6051621A (en) * | 1997-07-15 | 2000-04-18 | The Dow Chemical Company | High temperature syndiotactic styrene polymer foam |
| JP2009149050A (en) * | 2007-09-03 | 2009-07-09 | Mitsubishi Plastics Inc | Method of manufacturing polystyrene based resin made foamed biaxially stretched sheet, sheet and molded product using the sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0673902B2 (en) | 1994-09-21 |
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