JPS6313815B2 - - Google Patents
Info
- Publication number
- JPS6313815B2 JPS6313815B2 JP58143839A JP14383983A JPS6313815B2 JP S6313815 B2 JPS6313815 B2 JP S6313815B2 JP 58143839 A JP58143839 A JP 58143839A JP 14383983 A JP14383983 A JP 14383983A JP S6313815 B2 JPS6313815 B2 JP S6313815B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- temperature
- polymer sheet
- electrical resistance
- cooling body
- 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
- 238000001816 cooling Methods 0.000 claims description 36
- 229920000642 polymer Polymers 0.000 claims description 22
- 239000004065 semiconductor Substances 0.000 claims description 22
- 229920001169 thermoplastic Polymers 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000010410 layer Substances 0.000 description 22
- 238000000034 method Methods 0.000 description 12
- 239000004020 conductor Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 206010014357 Electric shock Diseases 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
- B29C48/9165—Electrostatic pinning
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
-
- 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
- B29C48/92—Measuring, controlling or regulating
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、熱可塑性重合体シートの製造方法に
関するもので、さらに詳しくは熱可塑性重合体を
移動冷却体表面へシート状に押出し急冷成型する
熱可塑性重合体シートの製造方法に関するもので
ある。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for producing a thermoplastic polymer sheet, and more specifically, a thermoplastic polymer sheet is extruded onto the surface of a moving cooling body and rapidly cooled and molded. The present invention relates to a method for producing a plastic polymer sheet.
従来の熱可塑性重合体シートの製造方法として
は、(1)電気的に接地された冷却ローラー上面上に
高電圧に帯電させた電極部材を設け、シート上面
に静電気を印加し、該シートの冷却ロールへの密
着作用を得る方法（以下、従来例１と云う）、(2)
冷却ローラー自体を高電圧に帯電させ、密着作用
を得る方法（以下、従来例２と云う）、などが知
られている。
Conventional methods for producing thermoplastic polymer sheets include: (1) An electrode member charged to a high voltage is provided on the top surface of an electrically grounded cooling roller, static electricity is applied to the top surface of the sheet, and the sheet is cooled. Method for obtaining adhesion to rolls (hereinafter referred to as conventional example 1), (2)
A method of obtaining an adhesion effect by charging the cooling roller itself to a high voltage (hereinafter referred to as conventional example 2) is known.
しかしながら、従来法いずれの場合も、冷却ロ
ールの速度を上昇させ重合体シートを効率よく製
造しようとすると、該シートと冷却ロールの間に
空気の巻き込みが起こり、重合体シートの表面状
態の悪化が起きる。従来例１の方法では、この上
限速度は40〜50ｍ／分である。また、従来例１の
方法には、電極の寿命、電極切れ、等によるトラ
ブル、さらに、シートを介して電極があるため、
シートに欠陥があると、電極よりローラーに放電
し、ローラー表面を破損するトラブルも起こるた
め、操業上種々の問題がある。また、従来例２で
は、前述のような問題はないが、上限速度が、本
発明者らの検討によれば、25〜30ｍ／分であり、
従来例１よりもかなり劣つている。 However, in both conventional methods, when attempting to efficiently produce a polymer sheet by increasing the speed of the cooling roll, air is trapped between the sheet and the cooling roll, resulting in deterioration of the surface condition of the polymer sheet. get up. In the method of Conventional Example 1, this upper limit speed is 40 to 50 m/min. In addition, the method of Conventional Example 1 has problems due to the lifespan of the electrode, electrode breakage, etc. Furthermore, since the electrode is inserted through the sheet,
If there is a defect in the sheet, electrical discharge may occur from the electrode to the roller, causing damage to the roller surface, resulting in various operational problems. In addition, in Conventional Example 2, although there is no problem as described above, the upper limit speed is 25 to 30 m/min, according to the study by the present inventors.
This is considerably inferior to Conventional Example 1.
そこで、本発明者らは、前述の問題点がなく、
なおかつ上限速度が高い方法を見出すべく検討を
行なつたところ、従来例２の方法での速度の上限
において以下の問題点のあることが判明した。 Therefore, the present inventors have discovered that there is no problem mentioned above, and
Furthermore, when we conducted an investigation to find a method with a high upper limit speed, we found that the method of Conventional Example 2 had the following problems with the upper speed limit.
(1) 冷却ローラー表面とローラーに接触する直前
の重合体シート間に微小な放電が発生し、その
結果静電的な密着力が低下する。(1) A minute electrical discharge occurs between the cooling roller surface and the polymer sheet just before it comes into contact with the roller, resulting in a decrease in electrostatic adhesion.
(2) さらに電圧を上げると、ローラーからシート
が押出される口金への火花放電が起こり、著し
い密着力の低下およびローラー表面の破損をひ
き起こす。(2) If the voltage is further increased, spark discharge occurs from the roller to the die from which the sheet is extruded, causing a significant decrease in adhesion and damage to the roller surface.
したがつて従来例２の方法では、高速で十分な
密着力が得られるまで電圧が上げられず、速度の
上限が低いところに留まつているという問題点が
あつた。 Therefore, the method of Conventional Example 2 had the problem that the voltage could not be increased until sufficient adhesion was obtained at high speed, and the upper limit of speed remained low.
本発明の目的は、上記従来例の問題点を解消
し、重合体シートが高速で安定して製造できる方
法を提供せんとするものである。
An object of the present invention is to solve the problems of the above-mentioned conventional examples and to provide a method by which a polymer sheet can be produced stably at high speed.
上記の目的を達成するため、本発明は次の構成
からなる。すなわち、融解した熱可塑性重合体を
口金からシート状にして移動冷却体上へ押出し、
該シートを移動冷却体で冷却固化せしめる重合体
シートの製造方法において、該移動冷却体とし
て、冷却部が導電層と該導電層の外面に形成され
た電気抵抗が負の温度係数を有する感温半導体層
を具備した移動冷却体を用い、融解した重合体シ
ートを該感温半導体の層に接触させて該感温半導
体の層の電気抵抗値を重合体シートが接触する前
の抵抗値よりも低下させると共に、口金と導電層
との間に電圧を印加する熱可塑性重合体シートの
製造方法を特徴とするものである。
In order to achieve the above object, the present invention consists of the following configuration. That is, the molten thermoplastic polymer is extruded from a die into a sheet onto a moving cooling body,
In the method for producing a polymer sheet, the sheet is cooled and solidified using a moving cooling body, wherein the cooling section includes a conductive layer and a temperature-sensitive material having a negative temperature coefficient of electrical resistance formed on the outer surface of the conductive layer. Using a moving cooling body provided with a semiconductor layer, a molten polymer sheet is brought into contact with the temperature-sensitive semiconductor layer, and the electrical resistance of the temperature-sensitive semiconductor layer is lowered than the resistance before the polymer sheet comes into contact with the temperature-sensitive semiconductor layer. The present invention is characterized by a method of manufacturing a thermoplastic polymer sheet in which a voltage is applied between a base and a conductive layer.
本発明における熱可塑性重合体とは、ポリエチ
レン、ポリプロピレン等のポリオレフイン類、ポ
リエステル類、ポリアミド類、ポリイミド類、ポ
リスチレン類、ポリビニル類等のシートとして成
型され得る周知の重合体およびこれらの共重合
体、混合体であつて、他の添加剤などが含有され
たものであつてもよい。また、口金から押出され
た溶融シートは、単層でも多層でも積層されたも
のであつてもよい。 Thermoplastic polymers in the present invention include well-known polymers that can be molded into sheets such as polyolefins such as polyethylene and polypropylene, polyesters, polyamides, polyimides, polystyrenes, and polyvinyls, and copolymers thereof; It may be a mixture and may contain other additives. Further, the molten sheet extruded from the die may be a single layer, a multilayer, or a laminated sheet.
本発明における移動冷却体とは、冷却ローラー
冷却ベルトなど周知のもので、これらの複合体な
らびに、冷却面に絶縁層を介して導電層を被覆し
たものも含まれる。 The moving cooling body in the present invention includes well-known cooling rollers, cooling belts, etc., and includes composites thereof as well as those in which the cooling surface is coated with a conductive layer via an insulating layer.
また、移動冷却体は、冷却部もしくは全体が各
種の導電体、好ましくは金属で形成され、その導
電体（絶縁体を介して導電体が設けられた場合
は、最外層の導電体を指すものとする）の表面
に、電気抵抗値が負の温度係数を有する感温半導
体層を設けたものである。 In addition, in a mobile cooling body, the cooling part or the entire body is formed of various types of conductor, preferably metal, and the conductor (if the conductor is provided through an insulator, it refers to the outermost layer of the conductor) A temperature-sensitive semiconductor layer whose electrical resistance value has a negative temperature coefficient is provided on the surface of the semiconductor device.
電気抵抗値が負の温度係数をもつ感温半導体と
は、温度上昇に対して電気抵抗値が減少する特性
をもつ抵抗体であり、周知の半導体および高分子
物質が含まれる。 A temperature-sensitive semiconductor whose electrical resistance value has a negative temperature coefficient is a resistor whose electrical resistance value decreases as the temperature rises, and includes well-known semiconductors and polymeric substances.
この感温半導体は、融解した重合体シートが接
解したとき、電気抵抗が低下するものであればよ
いが、低下する程度は、接触前の電気抵抗値の
１／５以下、好ましくは１／10以下、より好まし
くは１／100以下となる特性を有するものが望ま
しい。ただし、重合体シートが接触する前の感温
半導体の電気抵抗値が変動するなどして不明確の
ときは、感温半導体の温度が30℃のときの電気抵
抗値を、接触前の電気抵抗値とする。また、電気
抵抗値は体積固有抵抗として求められる値であ
る。 This temperature-sensitive semiconductor may be one that reduces electrical resistance when the molten polymer sheet is welded, but the degree of reduction is 1/5 or less, preferably 1/5 of the electrical resistance before contact. 10 or less, more preferably 1/100 or less. However, if the electrical resistance value of the temperature-sensitive semiconductor before the polymer sheet comes into contact with it is uncertain due to fluctuations, the electrical resistance value when the temperature of the temperature-sensitive semiconductor is 30°C is used as the electrical resistance value before contact. value. Further, the electrical resistance value is a value determined as a volume resistivity.
なお、ここで言う半導体とは、温度が25℃以
上、350℃以下の範囲で、体積固有抵抗値が100
Ω・cm以上、1014Ω・cm以下になる物質が望まし
く、これには、上記温度範囲の一部分でのみ体積
固有抵抗値が上記範囲にある物質も含まれる。ま
た、上記温度範囲で融解する物質であつても、使
用する熱可塑性重合体の融点により好ましい耐熱
性を有する物質は、ここで言う感温半導体に含ま
れる。 Note that the semiconductor referred to here has a volume resistivity of 10 0 at a temperature of 25°C or higher and 350°C or lower.
Preferably, the material has a resistivity of Ω·cm or more and 10 14 Ω·cm or less, and this also includes a material whose volume resistivity is within the above range only in a part of the above temperature range. Furthermore, even if the substance melts in the above temperature range, the substance has heat resistance that is preferable depending on the melting point of the thermoplastic polymer used, and is included in the temperature-sensitive semiconductor referred to herein.
以上の条件を満足する感温半導体のなかでは、
加工性、安定性の面から、ナイロン、エポキシと
いつた樹脂、およびサーミスタに用いられる酸化
金属類などが好ましい。 Among the temperature-sensitive semiconductors that satisfy the above conditions,
In terms of processability and stability, resins such as nylon and epoxy, and metal oxides used in thermistors are preferred.
本発明においては、口金と移動冷却体の導電層
との間に電圧を印加し、重合体シートを移動冷却
体に静電的に密着固化せしめるものである。そし
て、その際に印加する電圧は、交流・直流のいず
れでもよいが、好ましくは電圧変動率１％以下の
直流で移動冷却体側が口金に対して負であるのが
望ましい。 In the present invention, a voltage is applied between the cap and the conductive layer of the moving cooling body to electrostatically solidify the polymer sheet in close contact with the moving cooling body. The voltage applied at this time may be either alternating current or direct current, but preferably it is direct current with a voltage fluctuation rate of 1% or less and is negative on the movable cooling body side with respect to the base.
なお、口金、導電層の小なくとも一方は、アー
スまたは装置の架台等から電気的に絶縁され、両
者間は電気的に絶縁されているものとする。ま
た、この両者間の電気的絶縁は前記したように、
移動冷却体の冷却部に絶縁体を介して導電層が設
けた電気的絶縁方法であつてもよい。 It is assumed that at least one of the cap and the conductive layer is electrically insulated from the ground or the pedestal of the device, and the two are electrically insulated. In addition, as mentioned above, the electrical insulation between the two is
An electrically insulating method may be used in which a conductive layer is provided in the cooling part of the mobile cooling body via an insulator.
次に、図面に基づいて本発明を説明するが、こ
れに限定されるものではない。 Next, the present invention will be explained based on the drawings, but the present invention is not limited thereto.
第１図は、本発明の熱可塑性重合体シートの製
造方法に使用する装置の概略の断面図である。 FIG. 1 is a schematic cross-sectional view of an apparatus used in the method for producing a thermoplastic polymer sheet of the present invention.
第１図において、電気的に接地された口金１か
ら溶融押出された重合体シート２は、移動冷却体
９に接触し、冷却固化され、引離しローラー７を
介して後処理工程へ連続的に送られる。 In FIG. 1, a polymer sheet 2 melted and extruded from an electrically grounded die 1 contacts a moving cooling body 9, is cooled and solidified, and is continuously transferred to a post-processing step via a separating roller 7. Sent.
移動冷却体９は冷却ローラー３の表面上に、絶
縁性皮膜４を介して導電性皮膜５が設けられ、そ
の導電性皮膜５の上、すなわちシートと直接接触
する面に感温半導層６が設けられている。 In the mobile cooling body 9, a conductive film 5 is provided on the surface of the cooling roller 3 via an insulating film 4, and a temperature-sensitive semiconductor layer 6 is provided on the conductive film 5, that is, on the surface that is in direct contact with the sheet. is provided.
なお、移動冷却体側を接地する場合は口金１を
絶縁部材により絶縁することで口金１と移動冷却
体間に高電圧をかけることができる（図示省略）。 Note that when the movable cooling body side is grounded, a high voltage can be applied between the cap 1 and the movable cooling body by insulating the cap 1 with an insulating member (not shown).
一方、口金１と導電性皮膜５との間には、電源
装置８から電圧が印加されている。また、融解し
た重合体シート２が接触し高温になつた部分の感
温半導体層６の電気抵抗は、重合体シート２が接
触する直前の感温半導体層６の電気抵抗よりも低
くなつている。 On the other hand, a voltage is applied between the base 1 and the conductive film 5 from the power supply device 8 . Further, the electrical resistance of the temperature-sensitive semiconductor layer 6 at the portion where the melted polymer sheet 2 contacts and becomes high temperature is lower than the electrical resistance of the temperature-sensitive semiconductor layer 6 immediately before the polymer sheet 2 contacts. .
したがつて、高圧電源８から流れる電流は、重
合体シート２と導電性皮膜５との間において、感
温半導体層６の融解した重合体シート２が接触し
高温になつた部分に流れ、他の部分には流れなく
なる。このため、感温半導体層６とその層６に接
触する直前の重合体シート２の間での微小な放電
は発生しなくなる。 Therefore, the current flowing from the high-voltage power supply 8 flows between the polymer sheet 2 and the conductive film 5 to the part of the temperature-sensitive semiconductor layer 6 where the melted polymer sheet 2 contacts and becomes high temperature, and the other parts The flow will no longer flow to that part. Therefore, minute discharges between the temperature-sensitive semiconductor layer 6 and the polymer sheet 2 immediately before contacting the layer 6 are no longer generated.
本発明は口金と移動冷却体の導電層間に電圧を
印加し、かつ、重合体シート自体の熱によつて、
そのシートの接した部分のみ電気抵抗を低下させ
る方法としたことにより、以下の効果が得られ
た。
The present invention applies a voltage between the cap and the conductive layer of the moving cooling body, and uses the heat of the polymer sheet itself to
The following effects were obtained by reducing the electrical resistance only in the areas where the sheets were in contact.
(1) 従来例２で問題となる、高電圧領域での微小
放電が防止でき、電圧を上げることができた。(1) It was possible to prevent minute discharges in the high voltage region, which were a problem in Conventional Example 2, and to increase the voltage.
(2) 上記(1)項の効果、シート製造速度が大巾に増
加できた。(2) As a result of item (1) above, the sheet manufacturing speed was significantly increased.
(3) 冷却体において、高温部分（融解した熱可塑
性重合体シートが接触している部分）以外は電
気抵抗が高く保たれ、接触時の感電等の危険性
が低下した。(3) The electrical resistance of the cooling body was maintained high except for the high temperature part (the part in contact with the molten thermoplastic polymer sheet), reducing the risk of electric shock, etc. upon contact.
以下、実施例に基づいて本発明の一実施態様を
説明する。
Hereinafter, one embodiment of the present invention will be described based on Examples.
実施例 １
第１図に示した装置を用い、ポリエチレンテレ
フタレートのシートを成型した。装置条件は、口
金巾400mm、口金スリツト巾１mm、冷却ローラー
径600mmであり、冷却ローラー表面には、体積固
有抵抗値が150℃で108Ω・cm、25℃で1015Ω・cm
であるナイロンを0.5mm厚でコーテイングした。Example 1 A sheet of polyethylene terephthalate was molded using the apparatus shown in FIG. The equipment conditions are a mouthpiece width of 400mm, a mouthpiece slit width of 1mm, and a cooling roller diameter of 600mm.The cooling roller surface has a volume resistivity of 10 8 Ω・cm at 150℃ and 10 15 Ω・cm at 25℃.
It was coated with 0.5mm thick nylon.
ローラーと口金間の印加電圧は、ローラー速度
を上昇させながら、シートの密着不良が起こると
その都度昇圧させた。ローラーの電位変動は、オ
シロスコープにてモニターし微小放電の発生をチ
エツクした。 The voltage applied between the roller and the cap was increased each time poor adhesion of the sheets occurred while increasing the roller speed. The potential fluctuations of the roller were monitored using an oscilloscope to check for the occurrence of minute discharges.
上述の方法によりシートを製造したところ、
35kVに昇圧しても微小放電は発生せず、最終的
に密着不良が起こり始める速度は、75ｍ／分であ
つた。 When a sheet was manufactured by the method described above,
Even when the voltage was increased to 35 kV, no micro discharge occurred, and the speed at which poor adhesion finally began was 75 m/min.
比較例 １
実施例１の冷却ローラーを同一の大きさ形状
の、表面層が通常用いられるスチール製のものに
交換した以外は、実施例１と全く同じ装置と方法
でシートを製造したところ、15kVで、シートと
接触する直前のローラー表面からシート表面へ微
小放電が起こり始め、15kV以上に電圧を上げる
とシートの密着力が低下した。その結果シートの
密着不良が起こり始める速度は30ｍ／分以上には
できなかつた。Comparative Example 1 A sheet was manufactured using the same equipment and method as in Example 1, except that the cooling roller in Example 1 was replaced with one of the same size and shape, and the surface layer was made of commonly used steel. Then, micro-discharge started to occur from the roller surface just before it came into contact with the sheet to the sheet surface, and when the voltage was increased above 15 kV, the adhesion of the sheet decreased. As a result, the speed at which sheet adhesion failure began could not be increased above 30 m/min.
第１図は、本発明の方法を適用した装置の概略
断面図である。
１：口金、２：重合体シート、３：冷却ローラ
ー、４：絶縁性皮膜、５：導電性皮膜、６：感温
半導体層、７：引離しローラー、８：電源装置、
９：移動冷却体。
FIG. 1 is a schematic cross-sectional view of an apparatus to which the method of the present invention is applied. 1: Base, 2: Polymer sheet, 3: Cooling roller, 4: Insulating film, 5: Conductive film, 6: Temperature-sensitive semiconductor layer, 7: Separation roller, 8: Power supply device,
9: Mobile cooling body.
Claims (1)
にして移動冷却体上へ押出し、該シートを移動冷
却体で冷却固化せしめる重合体シートの製造方法
において、該移動冷却体として、冷却部が導電層
と該導電層の外面に形成された電気抵抗が負の温
度係数を有する感温半導体層を具備した移動冷却
体を用い、融解した重合体シートを該感温半導体
の層に接触させて該感温半導体の層の電気抵抗値
を重合体シートが接触する前の抵抗値よりも低下
させると共に、口金と導電層との間に電圧を印加
することを特徴とする熱可塑性重合体シートの製
造方法。1. A method for producing a polymer sheet in which a molten thermoplastic polymer is extruded from a die into a sheet onto a moving cooling body, and the sheet is cooled and solidified by the moving cooling body, in which the cooling part is a conductive layer. and a temperature-sensitive semiconductor layer having a negative temperature coefficient of electrical resistance formed on the outer surface of the conductive layer. A method for producing a thermoplastic polymer sheet, comprising lowering the electrical resistance value of the hot semiconductor layer below the resistance value before the polymer sheet comes into contact with it, and applying a voltage between the cap and the conductive layer. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58143839A JPS6034826A (en) | 1983-08-08 | 1983-08-08 | Preparation of thermoplastic polymer sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58143839A JPS6034826A (en) | 1983-08-08 | 1983-08-08 | Preparation of thermoplastic polymer sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6034826A JPS6034826A (en) | 1985-02-22 |
| JPS6313815B2 true JPS6313815B2 (en) | 1988-03-28 |
Family
ID=15348145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58143839A Granted JPS6034826A (en) | 1983-08-08 | 1983-08-08 | Preparation of thermoplastic polymer sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6034826A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019116600A1 (en) | 2017-12-14 | 2019-06-20 | 硬化クローム工業株式会社 | Cooling roll and method for producing thermoplastic resin sheet using same |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62255112A (en) * | 1986-04-30 | 1987-11-06 | Toray Ind Inc | Manufacture of thermoplastic polymeric sheet |
| JPH04123387U (en) * | 1991-04-22 | 1992-11-09 | 三菱重工業株式会社 | slurry pump |
| KR102387064B1 (en) * | 2017-12-14 | 2022-04-18 | 코카 크롬 인더스트리 컴퍼니 리미티드 | Cooling roll and manufacturing method of thermoplastic resin sheet using same |
-
1983
- 1983-08-08 JP JP58143839A patent/JPS6034826A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019116600A1 (en) | 2017-12-14 | 2019-06-20 | 硬化クローム工業株式会社 | Cooling roll and method for producing thermoplastic resin sheet using same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6034826A (en) | 1985-02-22 |
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