JPS5812144B2 - Hatsuposhi - Tonoseizohouhouu - Google Patents
Hatsuposhi - TonoseizohouhouuInfo
- Publication number
- JPS5812144B2 JPS5812144B2 JP50155805A JP15580575A JPS5812144B2 JP S5812144 B2 JPS5812144 B2 JP S5812144B2 JP 50155805 A JP50155805 A JP 50155805A JP 15580575 A JP15580575 A JP 15580575A JP S5812144 B2 JPS5812144 B2 JP S5812144B2
- Authority
- JP
- Japan
- Prior art keywords
- cylindrical body
- cooling
- ring
- air
- 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.)
- Expired
Links
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Description
【発明の詳細な説明】
本発明は改良された発泡シートの製造方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to an improved method of making foam sheets.
従来、滑らかで光沢のある外観を有した発泡シートの製
造方法として、特公昭４３−１５７０９号に記載された
如く、発泡剤を含む熱可塑性樹脂を押出機で溶融混練さ
せ、該押出機の先端に設けた環状スリットダイから筒状
体の形に押出して発泡を開始させ、該筒状体の内外面を
温度調節された冷却リングに接触させると共に、筒状体
の内部空洞に空気を吹き込みながら冷却ドラムへ引取り
発泡シートを製造する方法が提案されている。Conventionally, as a method for manufacturing a foamed sheet having a smooth and glossy appearance, as described in Japanese Patent Publication No. 15709/1983, a thermoplastic resin containing a foaming agent is melt-kneaded in an extruder, and the tip of the extruder is The product is extruded into a cylindrical body through an annular slit die provided in the cylindrical body to start foaming, and the inner and outer surfaces of the cylindrical body are brought into contact with a temperature-controlled cooling ring, while air is blown into the internal cavity of the cylindrical body. A method of manufacturing a foam sheet by taking it to a cooling drum has been proposed.
しかし乍ら、上記従来技術を使用して発泡シートの表面
に発泡を抑えたスキン層を付与し外観改良を行う場合、
発泡シートの巾方向におけるスキン層のむらや肉厚みむ
らが発生し、良質のシートを得にくい。However, when improving the appearance by applying a skin layer that suppresses foaming to the surface of a foamed sheet using the above-mentioned conventional technology,
This causes unevenness in the skin layer and thickness in the width direction of the foam sheet, making it difficult to obtain a high-quality sheet.
またこのような従来法では、発泡シートの表面を摩擦す
るものであるから発泡シートの帯電量が増加する等の欠
点を有している。Moreover, such conventional methods have drawbacks such as an increase in the amount of charge on the foam sheet because the surface of the foam sheet is rubbed.
本発明の目的は、厚み精度が高くかつシート全面に亘り
スキン層が均一に付与されかつ帯電量の少い発泡シート
の製造方法を提供することである。An object of the present invention is to provide a method for manufacturing a foamed sheet with high thickness accuracy, a skin layer uniformly applied over the entire surface of the sheet, and a small amount of electrical charge.
即ち本発明は、押出性発泡シートの製造に於いて、押出
機ダイの右後方に位置する冷却リングと共にニアリング
を併用し、これに加えて水滴を含む空気を用いることを
内容とするものである。That is, the present invention uses nearing together with a cooling ring located at the right rear of the extruder die in the production of extrudable foam sheets, and in addition to this, air containing water droplets is used. .
本発明に用いる発泡可能な熱可塑性樹脂はポリスチレン
、ＡＳ樹脂、ＡＢＳ樹脂、ポリ塩化ビニル、ポリエチレ
ン、またはポリプロピレン等の熱可塑性樹脂にプロパン
、ブタン、ペンタン等の低沸点炭化水素やフレオン−１
１、フレオン−１２等のフッ化塩化炭素化合物に代表さ
れる発泡剤をあらかじめ含浸したもの、または押出機の
途中で上記発泡剤を圧入混和したものが用いられる。The foamable thermoplastic resin used in the present invention is a thermoplastic resin such as polystyrene, AS resin, ABS resin, polyvinyl chloride, polyethylene, or polypropylene, and a low boiling point hydrocarbon such as propane, butane, pentane, or freon-1.
1. A material pre-impregnated with a blowing agent typified by a fluorochlorinated carbon compound such as Freon-12, or a material in which the above-mentioned blowing agent is press-in-mixed during the extruder are used.
また、発泡助剤として、あらかじめ熱可塑性樹脂に重炭
酸ソーダ、クエン酸もしくはアゾジカルボンアミド等の
加熱によりガスを発生する化学発泡剤、またはタルク、
シリカ等の無機物質及び架橋剤を添加しても差支えない
。In addition, as a foaming aid, a chemical foaming agent that generates gas by heating the thermoplastic resin, such as sodium bicarbonate, citric acid, or azodicarbonamide, or talc,
Inorganic substances such as silica and crosslinking agents may be added.
本発明に用いる外部冷却リング及び内部冷却リングは液
体又は気体の冷却媒体により温度調節ができる構造であ
ることが必要であり、また樹脂筒状体と接触する面は平
滑であるものが好ましい。The external cooling ring and internal cooling ring used in the present invention must have a structure that allows temperature adjustment using a liquid or gaseous cooling medium, and preferably have a smooth surface that comes into contact with the resin cylindrical body.
本発明に用いるニアリングは環状の吹出口を有し、空気
供給口に噴霧装置を有したものであって、ニアリングよ
り空気を吹出すとこの噴霧装置によって空気中に水滴を
分散させる機能を有したものである。The near ring used in the present invention has an annular outlet and a spray device at the air supply port, and has the function of dispersing water droplets in the air when air is blown out from the near ring. It is something.
そして、本発明に用いる水滴を含む空気は、一般的に湿
度で表示される湿潤空気１立方メートル中に水２０ｇ以
上を霧状に分散させたものが好適であるが、夏季に於て
湿度が極めて高い場合は２０ｇ未満の水でも差支えない
。The air containing water droplets used in the present invention is preferably one in which 20 g or more of water is dispersed in the form of a mist in 1 cubic meter of humid air, which is generally expressed as humidity. If it is expensive, less than 20g of water can be used.
以下に、図面によりながら本発明の代表的な実施態様を
説明する。Hereinafter, typical embodiments of the present invention will be described with reference to the drawings.
第１図は本発明による発泡シートの製造に用いる装置の
略図である。FIG. 1 is a schematic diagram of the apparatus used for manufacturing foam sheets according to the invention.
第２図は第１図の環状スリットダイ３２、外部冷却リン
グ１、ニアリング３、冷却ドラム６及び樹脂筒状体２０
の部分断面を示したものである。FIG. 2 shows the annular slit die 32, external cooling ring 1, near ring 3, cooling drum 6, and resin cylindrical body 20 shown in FIG.
This shows a partial cross section of .
また、第３図は第２図中のＡ−Ａ’断面を示したもので
ある。Further, FIG. 3 shows a cross section taken along line AA' in FIG. 2.
第４図は外部冷却リングを２個、内部冷却リングを１個
装備した本発明による実施態様をダイ途中から冷却ドラ
ム迄の断面で示したものである。FIG. 4 shows an embodiment of the present invention equipped with two external cooling rings and one internal cooling ring in a cross section from the middle of the die to the cooling drum.
各図面に於て、３０は押出機であって、原料の供給口で
あるホッパー３１より供給された発泡剤を含浸した熱可
塑性樹脂を溶融混練し、該押出機３０の先端に設けた環
状スリット部３３を有する環状スリットダイ３２より樹
脂を筒状体２０として押出す作用をする。In each drawing, 30 is an extruder, which melts and kneads the thermoplastic resin impregnated with a foaming agent supplied from a hopper 31 that is a raw material supply port, and has an annular slit provided at the tip of the extruder 30. It functions to extrude the resin as a cylindrical body 20 through an annular slit die 32 having a portion 33.
押出された樹脂筒状体２０は発泡を開始するとそのまゝ
では第３図に示す如く直径方向に“波打ち“を生じる。When the extruded resin cylindrical body 20 starts foaming, "waving" occurs in the diameter direction as shown in FIG. 3.
こゝで、樹脂筒状体２０を押出しながら、これと環状ス
リットダイ３２及び冷却ドラム６とで構成される空洞２
１に冷却ドラム６の中を通る空気導管８の先端に設けた
吹出孔９より空気または、水滴を含む空気を吹き込んで
樹脂筒状体２０を直径方向に膨張させ冷却ドラム６への
引取りを容易にすると同時に前記“波打ち“を減少させ
る。Here, while extruding the resin cylindrical body 20, the cavity 2 consisting of this, the annular slit die 32, and the cooling drum 6 is opened.
Air or air containing water droplets is blown into the cooling drum 6 through a blowing hole 9 provided at the tip of an air conduit 8 passing through the cooling drum 6 to expand the resin cylindrical body 20 in the diametrical direction and take it into the cooling drum 6. At the same time, the "undulation" is reduced.
この“波打ち“は発泡シートの気泡を細くする為にダイ
内の樹脂圧力を高めたり、発泡シートの強度向上を目的
としてより高分子の熱可塑性樹脂を用いた場合に特に大
きくなる。This "waving" becomes particularly large when the resin pressure in the die is increased to make the cells in the foam sheet thinner, or when a higher molecular weight thermoplastic resin is used to improve the strength of the foam sheet.
このような状態に於て、樹脂筒状体２０を導管２を通る
水などの冷却媒体によって温度調節された前記外部冷却
リング１の平滑な内壁に接触させて表面の気泡の成長を
抑えると共に該表面を平滑にし、次いでダイから見て該
外部冷却１ング１のすぐ後方に設置されたニアリング３
より冷却用の水滴を含む空気を吹きつけつゝ冷却ドラム
６を覆う様に引取る。In this state, the resin cylindrical body 20 is brought into contact with the smooth inner wall of the external cooling ring 1 whose temperature is controlled by a cooling medium such as water passing through the conduit 2 to suppress the growth of air bubbles on the surface and to The surface is made smooth, and then a near ring 3 is installed immediately behind the external cooling ring 1 when viewed from the die.
While blowing air containing water droplets for cooling, the cooling drum 6 is taken over so as to cover it.
該樹脂筒状体２０の雰囲気を該ニアリング３より吹出す
空気により均一化する事によって、雰囲気の対流又は乱
流から生じる樹脂筒状体２０表面の冷却ムラによってひ
き起される発泡ムラ、厚みムラ等を防ぐことができるの
である。By homogenizing the atmosphere of the resin cylindrical body 20 with the air blown out from the near ring 3, uneven foaming and thickness unevenness caused by uneven cooling of the surface of the resin cylindrical body 20 caused by convection or turbulence in the atmosphere can be prevented. etc. can be prevented.
こ５で空洞２１に吹き込まれた霊気は、樹脂筒状体２０
の膨張を助けると共にこの樹脂筒状体２０を外部冷却リ
ング６への接触を強くする様に働き、更には冷却ドラム
６の表面と樹脂筒状体２０の間の潤滑剤的役割を果す。The spiritual energy blown into the cavity 21 in this step 5 is transferred to the resin cylindrical body 20.
The resin cylindrical body 20 serves to strengthen the contact with the external cooling ring 6, and also serves as a lubricant between the surface of the cooling drum 6 and the resin cylindrical body 20.
所要空気量は僅かであり、その流量は冷却ドラム６の後
端に設けた排気弁１１によって調整される。The required amount of air is small, and its flow rate is adjusted by an exhaust valve 11 provided at the rear end of the cooling drum 6.
一方空洞２１に空気と共に吹き込まれた水滴は樹脂筒状
体２０の内壁に接して内壁を冷却すると共に冷却ドラム
６の表面を湿潤させ、樹脂筒状体２０と冷却ドラム６と
の滑りをよくすると同時に、樹脂筒状体２０の有する熱
によって水蒸気となって樹脂筒状体２０内面の静電気を
放電させる作用がある。On the other hand, the water droplets blown into the cavity 21 together with the air contact the inner wall of the resin cylindrical body 20 and cool the inner wall, and also moisten the surface of the cooling drum 6 to improve the sliding between the resin cylindrical body 20 and the cooling drum 6. At the same time, the heat of the resin cylindrical body 20 turns into water vapor, which has the effect of discharging static electricity on the inner surface of the resin cylindrical body 20.
このようにして、冷却ドラム６に引取られた樹脂筒状体
２０は導管７を通る水などの冷却媒体によって間接的に
冷却固化されると共に内側に平滑な面を附与される。In this way, the resin cylindrical body 20 taken up by the cooling drum 6 is indirectly cooled and solidified by the cooling medium such as water passing through the conduit 7, and a smooth surface is imparted to the inside.
次いで普通は冷却ドラム６の後端には刃（図示せず）が
設けてあり、樹脂筒状体は、切り開かれ引取機３４を経
て巻取機３５でロール状に巻取られる。Next, a blade (not shown) is usually provided at the rear end of the cooling drum 6, and the resin cylindrical body is cut open, passed through a take-up machine 34, and then wound up into a roll by a wind-up machine 35.
本発明の方法で得られた発泡シートは発生した静電気が
前記水滴を通して放電される為に帯電の少いものである
と同時にシート全面に亘りスキン層が均一に附与され、
且つ表裏共平滑な面を有する。The foamed sheet obtained by the method of the present invention has little charge because the static electricity generated is discharged through the water droplets, and at the same time, a skin layer is uniformly applied over the entire surface of the sheet.
It also has smooth surfaces on both the front and back.
上記の態様以外に、本発明では２個以上の外部冷却リン
グと１個以上のニアリングとを組合せて用いることによ
っても上記効果が増大する。In addition to the above-mentioned embodiments, the above-mentioned effects can also be increased by using a combination of two or more external cooling rings and one or more nearing rings in the present invention.
本発明に於て、外部冷却リング１と水滴を含む空気を用
いるニアリング３とを組合せた事により環状スリットダ
イ３２より押出された樹脂筒状体２０の表面層の冷却を
微妙に調節出来るものであって、該樹脂筒状体２０の表
面層の発泡を抑制すると同時に冷却リングにより筒状体
２０の外径を膨張させることができるのである。In the present invention, the cooling of the surface layer of the resin cylindrical body 20 extruded from the annular slit die 32 can be finely adjusted by combining the external cooling ring 1 and the near ring 3 using air containing water droplets. Therefore, it is possible to suppress foaming of the surface layer of the resin cylindrical body 20 and at the same time expand the outer diameter of the cylindrical body 20 using the cooling ring.
一方、ニアリング３は空気吹出量を円周に亘り均一化す
る為に該ニアリング３の吹出口５を円周に亘り６〜１０
位に等分割し、各部の空気吹出量をそれぞれ調節出来る
様な構造にすると更に好ましい。On the other hand, in order to equalize the amount of air blowing out over the circumference, the near ring 3 has air outlet ports 5 of 6 to 10 times around the circumference.
It is more preferable to have a structure in which it is divided into equal parts and the amount of air blown from each part can be adjusted.
この構造を有するニアリングを用いると、押出機３０の
混練が不均一の場合に樹脂筒状体２０の円周に亘る樹脂
温度が不均一となるために生じる発泡ムラ、厚みムラ又
はスキン層のムラ等を防ぐことができる。When a nearing having this structure is used, uneven foaming, uneven thickness, or uneven skin layer that occurs due to uneven resin temperature over the circumference of the resin cylindrical body 20 when kneading in the extruder 30 is uneven. etc. can be prevented.
更に、本発明の一態様として第４図に示す如く、環状ス
リット部３３と冷却ドラム６の間に外部冷却リング１を
１個以上（第４図では２個）を設け、該冷却リング１の
直後方にニアリング３を備え、更に該外部冷却リングの
いづれとも重ならない位置に内部冷却リング１３を設置
し、且つ環状スリット部３３より押出された樹脂筒状体
２０で囲まれている空洞２１に内部冷却リング１３の温
度調節用の空気導入孔１４及び空気吹出孔９より空気ま
たは水滴を含む空気を吹き込みつゝ、樹脂筒状体２０を
外部冷却リングの内面及び内部冷却リング１３の外面に
それぞれ接触させて樹脂筒状体２０の内外表面の気泡の
成長を抑え且つ平滑性を与えた状態でこの樹脂筒状体２
０の外側面にニアリング３より冷却用の水滴を含む空気
を吹きつけつつ樹脂筒状体２０を冷却ドラムへ引取って
発泡シートを製造することができる。Further, as an embodiment of the present invention, as shown in FIG. 4, one or more (two in FIG. 4) external cooling rings 1 are provided between the annular slit portion 33 and the cooling drum 6, and A near ring 3 is provided at the immediate rear, and an internal cooling ring 13 is installed at a position that does not overlap with any of the external cooling rings, and the cavity 21 is surrounded by a resin cylindrical body 20 extruded from an annular slit portion 33. While blowing air or air containing water droplets through the air inlet hole 14 and air outlet hole 9 for temperature adjustment of the inner cooling ring 13, the resin cylindrical body 20 is placed on the inner surface of the outer cooling ring and the outer surface of the inner cooling ring 13, respectively. This resin cylindrical body 2 is brought into contact to suppress the growth of bubbles on the inner and outer surfaces of the resin cylindrical body 20 and to provide smoothness.
A foam sheet can be manufactured by blowing air containing water droplets for cooling onto the outer surface of the resin cylinder 20 from the near ring 3 and taking the resin cylindrical body 20 to a cooling drum.
このようにして製造した発泡シートは、帯電量が少く厚
みも均一でかつ表裏面共に厚みのあるスキン層を全面に
且つ均一に有するものである。The foamed sheet produced in this manner has a small amount of charge, a uniform thickness, and a thick skin layer on both the front and back surfaces over the entire surface.
本発明に於て、空気吹出孔９をニアリング３の吹出口５
の如くスリット状として内部冷却リング１３の直後方に
設け、該スリットより吹出す空気を樹脂筒状体２０の内
面に吹き付けて該樹脂筒状体２０の内側表面の冷却を補
助する事は本発明の目的から云って特に支障ない。In the present invention, the air outlet 9 is connected to the outlet 5 of the near ring 3.
According to the present invention, a slit-shaped slit is provided immediately behind the internal cooling ring 13 as shown in FIG. Considering the purpose of this, there is no particular problem.
以上記載した通り、本発明によれば、発泡シートにスキ
ン層の厚みをより厚く付与出来るという効果に加え、発
泡シートの製造時に於ける静電気の帯電が少く、これの
放電火花による火災などの危険性が極めて低いものであ
り、可燃性ガスを発泡剤として安全に使用し得るもので
ある。As described above, according to the present invention, in addition to the effect of being able to provide a thicker skin layer to a foam sheet, there is less static electricity charging during the manufacturing of the foam sheet, and there is a risk of fire or the like due to discharge sparks. The foaming agent has extremely low combustible gas and can be safely used as a blowing agent.
また、本発明によれば、上記スキン層を有するのみでな
く厚み精度がよく、帯電による塵埃の吸着が少いことか
ら印刷適正の極めて優れた発泡シートを提供し得るもの
である。Further, according to the present invention, it is possible to provide a foam sheet that not only has the above-mentioned skin layer but also has good thickness accuracy and is highly suitable for printing because it attracts little dust due to charging.
次に、本発明の実施例について述べる。Next, examples of the present invention will be described.
実施例 １
第１図及び第２図に示した設備に於て、押出機３０がス
クリュー径５０ｍｍ、 Ｌ／Ｄ＝ ２４であり、スリッ
ト巾０．５ ｍｍで環状スリット部３３の径が６０ｍｍ
、冷却ドラム６の外径が１００ｍｍ、外部冷却リングの
内径が８０ｍｍである装置を用いて、ブタン５重量％を
含むポリスチレン１００部をタルク１部及び４〜４′オ
キシビスベンゼンスルフオニルヒドラジド１部と共に押
出機３０にて溶融混練し環状スリット３３から筒状体に
押出し発泡を開始せしめた。Example 1 In the equipment shown in Figs. 1 and 2, the extruder 30 has a screw diameter of 50 mm, L/D = 24, a slit width of 0.5 mm, and a diameter of the annular slit portion 33 of 60 mm.
Using an apparatus in which the outer diameter of the cooling drum 6 is 100 mm and the inner diameter of the outer cooling ring is 80 mm, 100 parts of polystyrene containing 5% by weight of butane is mixed with 1 part of talc and 1 part of 4-4' oxybisbenzenesulfonyl hydrazide. The mixture was melt-kneaded in an extruder 30 and extruded into a cylindrical body through an annular slit 33 to start foaming.
次いでこの樹脂筒状体２０の内部空洞２１に空気吹出孔
９から空気を吹き込み樹脂筒状体２０を直径方向に膨張
せしめると共に外部冷却リング１と内接させて樹脂筒状
体２０の表面の発泡を抑え、次いでニアリング３より該
筒状体の外側面に空気１立方メートル当り水３０ｇを水
滴として含ませた空気不吹きつけながら冷却ドラム６に
引取り冷却固化させた。Next, air is blown into the internal cavity 21 of the resin cylindrical body 20 from the air blowing hole 9 to expand the resin cylindrical body 20 in the diametrical direction, and also causes the resin cylindrical body 20 to be inscribed with the external cooling ring 1, thereby foaming the surface of the resin cylindrical body 20. Then, while air containing 30 g of water as droplets per cubic meter of air was blown onto the outer surface of the cylindrical body from the nearing 3, it was taken to the cooling drum 6 and cooled and solidified.
樹脂筒状体は切り開き引取機３４を経て巻取機３５にて
ロール状に巻き取った。The resin cylindrical body was passed through a cutting machine 34 and then wound up into a roll by a winding machine 35.
かくして得られた発泡シートは厚みが０．７ ｍｍ、厚
み精度が５％、また発泡倍率が６倍であり、スキン層が
厚く且つ静電気の帯電が少く、製造時に於ける放電現象
も全く見られなかった。The foamed sheet thus obtained had a thickness of 0.7 mm, a thickness accuracy of 5%, and a foaming ratio of 6 times, a thick skin layer, low static electricity charge, and no discharge phenomenon observed during manufacturing. There wasn't.
実施例 ２
実施例１に用いた装置に於て、押出機の途中より発泡剤
を注入出来る様に配管を設け、低密度ポリエチレン１０
０部をタルク１部及び４−４′オキシビスベンゼンスル
フオニルヒドラジド１部と共に溶融混練し発泡剤として
ブタン１０部を前記配管より押出機内に圧入し前記ポリ
エチレンに含浸せしめた。Example 2 In the equipment used in Example 1, piping was installed so that a blowing agent could be injected from the middle of the extruder, and low-density polyethylene 10
0 part was melt-kneaded with 1 part of talc and 1 part of 4-4'oxybisbenzenesulfonyl hydrazide, and 10 parts of butane as a blowing agent was press-injected into the extruder from the piping to impregnate the polyethylene.
次いで環状スリットダイより前記ブタンを含浸したポリ
エチレンを筒状体に押出し、ニアリング及び冷却ドラム
より空気１立方メートル当り水４０ｇを水滴として含む
空気を吹きつけつ５実施例１に準じた操作により発泡シ
ートを製造した。Next, the butane-impregnated polyethylene was extruded into a cylindrical body through an annular slit die, and air containing 40 g of water per cubic meter of air was blown through a nearing and cooling drum, and a foamed sheet was formed by the same procedure as in Example 1. Manufactured.
その結果、厚さ１．５ｍｍ、発泡倍率１５倍の発泡ポリ
エチレンシートが得られ、該シートは帯電が少く、シー
ト全面に亘り発泡むらがなくまた表裏共平滑な面を有す
るものであった。As a result, a foamed polyethylene sheet having a thickness of 1.5 mm and a foaming ratio of 15 times was obtained, and the sheet had little electrostatic charge, no uneven foaming over the entire surface of the sheet, and smooth surfaces on both the front and back surfaces.
第１図は本発明による発泡シートの製造に用いる装置の
略図である。
第２図は第１図中のダイ途中より冷却ドラム迄の環状ス
リットダイ３２、外部冷却リング１、ニアリング３、冷
却ドラム６及び樹脂筒状体２０の部分断面を示したもの
である。
第３図は第２図中のＡ−Ａ’断面を示したものであり、
第４図は外部冷却リングを２個、内部冷却リングを１個
装備した本発明による他の実施態様についてダイ途中か
ら冷却ドラム迄の断面を示した図である。
１・・・外部冷却リング、２・・・導管、３・・・ニア
リング、４・・・空気溜り、５・・・吹出口、６・・・
冷却ドラム、・７・・・導管、８・・・導管、９・・・
吹出孔、１０・・・排気管、１１・・・排気弁、１３・
・・内部冷却リング、１４・・・導入孔、１５・・・連
通孔、２０・・・樹脂筒状体、２１・・・空洞、３０・
・・押出機、３１・・・ホッパー、３２・・・環状スリ
ットダイ、３３・・・環状スリット部、３４・・・引取
機、３５・・・巻取機。FIG. 1 is a schematic diagram of the apparatus used for manufacturing foam sheets according to the invention. FIG. 2 shows a partial cross section of the annular slit die 32, the external cooling ring 1, the near ring 3, the cooling drum 6, and the resin cylindrical body 20 from the middle of the die to the cooling drum in FIG. Figure 3 shows the AA' cross section in Figure 2,
FIG. 4 is a cross-sectional view from the middle of the die to the cooling drum of another embodiment of the present invention equipped with two external cooling rings and one internal cooling ring. DESCRIPTION OF SYMBOLS 1... External cooling ring, 2... Conduit, 3... Near ring, 4... Air pocket, 5... Air outlet, 6...
Cooling drum, 7... Conduit, 8... Conduit, 9...
Blowout hole, 10...Exhaust pipe, 11...Exhaust valve, 13.
...Internal cooling ring, 14...Introduction hole, 15...Communication hole, 20...Resin cylindrical body, 21...Cavity, 30...
... Extruder, 31... Hopper, 32... Annular slit die, 33... Annular slit section, 34... Take-up machine, 35... Winding machine.
Claims (1)
スリットダイより筒状体の形に押出して発泡させ、次い
で樹脂筒状体を冷却ドラムに接触させて冷却して発泡シ
ートを得る際に、環状スリットと冷却ドラムの間に１個
以上の外部冷却リングを設置し、且つ任意の該外部冷却
リングの右後方にニアリングを備え、環状スリットダイ
と樹脂筒状体及び冷却ドラムとで構成される空間に該冷
却ドラムを通して空気を吹き入れ、樹脂筒状体を外部冷
却リングに内接させ、前記ニアリングより空気を吹きつ
けつゝ冷却ドラムへ引取る方法、（ｂ）もしくは上記方
法に加えて環状スリットと冷却ドラムの間に内部冷却リ
ングの１個以上を外部冷却リングと重ならない位置に設
置して、樹脂筒状体を内部冷却リングと外部冷却リング
とに接触させる方法に於て、ニアリングより吹きつける
空気または冷却ドラムを通して吹き込む空気の両方若し
くはいずれか一方に水滴を含ませることを特徴とする発
泡シートの製造方法。1(a) A foamable thermoplastic resin is extruded into a cylindrical shape through an annular slit die using an extruder to foam, and then the resin cylindrical body is brought into contact with a cooling drum and cooled to obtain a foamed sheet. In this case, one or more external cooling rings are installed between the annular slit and the cooling drum, and a near ring is provided at the right rear of any of the external cooling rings, and the annular slit die, the resin cylindrical body, and the cooling drum are connected to each other. A method in which air is blown into the configured space through the cooling drum, the resin cylindrical body is inscribed in an external cooling ring, and air is blown from the near ring and taken to the cooling drum, (b) or the above method. In addition, one or more internal cooling rings are installed between the annular slit and the cooling drum in a position that does not overlap with the external cooling ring, and the resin cylindrical body is brought into contact with the internal cooling ring and the external cooling ring. A method for producing a foamed sheet, characterized in that air blown from a near ring or air blown through a cooling drum, or both, contain water droplets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50155805A JPS5812144B2 (en) | 1975-12-27 | 1975-12-27 | Hatsuposhi - Tonoseizohouhouu |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50155805A JPS5812144B2 (en) | 1975-12-27 | 1975-12-27 | Hatsuposhi - Tonoseizohouhouu |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5280361A JPS5280361A (en) | 1977-07-06 |
| JPS5812144B2 true JPS5812144B2 (en) | 1983-03-07 |
Family
ID=15613826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50155805A Expired JPS5812144B2 (en) | 1975-12-27 | 1975-12-27 | Hatsuposhi - Tonoseizohouhouu |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5812144B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS649154A (en) * | 1987-07-02 | 1989-01-12 | Nippon Steel Corp | Easy open can lid having good drop shock resistance |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6130828Y2 (en) * | 1978-10-04 | 1986-09-09 | ||
| JPS5662135A (en) * | 1979-10-25 | 1981-05-27 | Mitsui Toatsu Chem Inc | Preparation of foamed polystyrene sheet |
-
1975
- 1975-12-27 JP JP50155805A patent/JPS5812144B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS649154A (en) * | 1987-07-02 | 1989-01-12 | Nippon Steel Corp | Easy open can lid having good drop shock resistance |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5280361A (en) | 1977-07-06 |
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