JP2696886B2 - Manufacturing method of thermoplastic resin sheet - Google Patents
Manufacturing method of thermoplastic resin sheetInfo
- Publication number
- JP2696886B2 JP2696886B2 JP63050477A JP5047788A JP2696886B2 JP 2696886 B2 JP2696886 B2 JP 2696886B2 JP 63050477 A JP63050477 A JP 63050477A JP 5047788 A JP5047788 A JP 5047788A JP 2696886 B2 JP2696886 B2 JP 2696886B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- sheet
- thermoplastic resin
- cooling roll
- linear
- 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
- B29C48/88—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
- B29C48/03—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
- B29C48/88—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
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】 （産業上の利用分野） 本発明は、重合体シートの製造方法に関するものでダ
イから溶融押出成形された重合体シートを静電ピニング
法により電荷を付与し冷却ロール面に密着させて急冷す
る方法においてスパーク耐久性のある電極を使用して厚
み均一性の優れた重合体フィルムを高能率で製造する方
法に関するものである。Description: FIELD OF THE INVENTION The present invention relates to a method for producing a polymer sheet, and applies a charge to a polymer sheet melt-extruded from a die by an electrostatic pinning method to form a cooling roll surface. The present invention relates to a method for producing a polymer film having excellent thickness uniformity with high efficiency by using an electrode having spark durability in a method of quenching by closely adhering the polymer film.
（従来の技術） 重合体シートを静電ピニング法で電荷を付与し冷却ロ
ール上で急冷製膜する方法は従来から知られており、例
えば特開昭56−105930号公報には熱可塑性樹脂シートを
冷却するに際しストリーマコロナ状態のコロナ放電を行
ないシートを冷却ロール面上に密着急冷させる方法が記
載されている。(Prior Art) A method of applying a charge to a polymer sheet by an electrostatic pinning method and rapidly forming a film on a cooling roll has been known. For example, JP-A-56-105930 discloses a thermoplastic resin sheet. It describes a method in which a corona discharge in a streamer corona state is performed to cool the sheet and the sheet is closely cooled on the surface of a cooling roll.
（発明が解決しようとする課題） しかしながらこの方法では電極として典型的には針状
タイプの電極を使用するため電極位置調整時のスパーク
や同一電極を長時間使用した場合、電極針先が損傷しス
トリーマコロナ状態の放電が不安定となりスパークトラ
ブルによるシートの切断、厚み均一性の悪化及び密着力
の低下による引取りスピードの低下等の重大な問題があ
った。本発明は、これらの問題を解決するための方法に
関するものである。(Problems to be Solved by the Invention) However, in this method, a needle-shaped electrode is typically used as an electrode. Therefore, when a spark is used for adjusting the electrode position or when the same electrode is used for a long time, the electrode needle tip is damaged. Discharge in a streamer corona state became unstable, and there were serious problems such as cutting of a sheet due to spark trouble, deterioration of thickness uniformity, and reduction of a take-up speed due to a decrease in adhesion. The present invention relates to a method for solving these problems.
（課題を解決するための手段） 本発明は、溶融した熱可塑性樹脂をダイからシートと
して押出し冷却ロール面上に密着、急冷する際に該シー
トの上方に配設した電極によって静電荷を付与し接地さ
れた冷却ロール面との間に作用する静電気的引力によっ
て前記シートを冷却ロール面に密着させて冷却する方法
において電極の表面に絶縁破壊電圧1KV以上の電気絶縁
性被覆を固定して設け且つ該電極に放電部を設けた熱可
塑性樹脂シートの製造法である。かかる手段により電極
損傷がなく厚み均一性の優れた重合体シートを安定して
高能率で製造する方法に関するものである。(Means for Solving the Problems) According to the present invention, a molten thermoplastic resin is extruded from a die as a sheet, adheres to the surface of a cooling roll, and when quenched, an electrostatic charge is applied by an electrode disposed above the sheet. In a method of cooling the sheet by bringing the sheet into close contact with the cooling roll surface by electrostatic attraction acting between the cooling roll surface and the ground, an electric insulating coating having a dielectric breakdown voltage of 1 KV or more is fixedly provided on the surface of the electrode; This is a method for producing a thermoplastic resin sheet having a discharge portion provided on the electrode. The present invention relates to a method for stably and efficiently producing a polymer sheet having excellent thickness uniformity without electrode damage by such means.
以下本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail.
本発明に適用しうる熱可塑性樹脂はナイロン６、ナイ
ロン66などのポリアミド樹脂、ポリエチレンテレフタレ
ート、ポリエチレンナフタレート等のポリエステル樹脂
が代表的であるが例示したものに限定されるものではな
い。The thermoplastic resin applicable to the present invention is typically a polyamide resin such as nylon 6 or nylon 66, or a polyester resin such as polyethylene terephthalate or polyethylene naphthalate, but is not limited thereto.
ここで使用する電極は、線状のものが好ましいがナイ
フ状または線状とナイフ状の組み合わせであってもよ
い。電極材質はチタン、タングステン、ステンレス、ア
ルミニウム、銅、タンタル製等のものが通常使用され
る。The electrode used here is preferably linear, but may be a knife or a combination of a linear and a knife. Electrode materials such as those made of titanium, tungsten, stainless steel, aluminum, copper, and tantalum are usually used.
ここに電極表面を絶縁破壊電圧1KV以上に絶縁するた
めの電気絶縁性被覆とは、フッ素樹脂、ポリイミド系樹
脂等の有機重合体材料あるいは、Al2O3のような電気絶
縁性セラミックス材料であり、被覆層は絶縁破壊電圧1K
V以上さらに好ましくは、3KV以上の耐電圧を備えるとい
う条件を考慮して材質厚みを選択する。又、電極の放電
部とは、絶縁被覆された電極表面の一部に絶縁されてい
ない部分（放電部）を設けたものである。Here, the electrically insulating coating for insulating the electrode surface to a dielectric breakdown voltage of 1 KV or more is an organic polymer material such as a fluororesin, a polyimide resin, or an electrically insulating ceramic material such as Al 2 O 3 . , Coating layer is dielectric breakdown voltage 1K
The material thickness is selected in consideration of the condition that a withstand voltage of 3 KV or more is provided. Further, the discharge part of the electrode is a part in which a non-insulated part (discharge part) is provided on a part of the surface of the electrode covered with insulation.
次に図面により詳細を説明する。図１、２は線状電極
とナイフ電極の概要を示したものである。１、３は電極
絶縁部２、４は絶縁被覆がなく電極が露出している部分
（放電部）である。線状電極の直径ｄは通常0.5〜8.0m
m、好ましくは1.0〜5.0mmであり、ナイフ状電極先端の
厚みｔは通常0.2〜5.0mm、好ましくは、0.3〜3.0mmであ
る。又線状ナイフ電極共放電部の幅Ｗは1.0mm以下好ま
しくは0.7mm以下であり放電部のピッチｐは、通常２〜2
0mm好ましくは４〜10mmが良い。上記条件から外れると
いずれもスパークトラブルが発生しやすくなり、又成形
シートの厚み均一性が悪くなる。放電部は外周に全周に
設けても、点状に設けても良い。Next, the details will be described with reference to the drawings. 1 and 2 show an outline of a linear electrode and a knife electrode. Reference numerals 1 and 3 denote electrode insulating portions 2 and 4 are portions (discharge portions) where the electrodes are exposed without insulating coating. The diameter d of the linear electrode is usually 0.5 to 8.0 m
m, preferably 1.0 to 5.0 mm, and the thickness t of the tip of the knife-shaped electrode is usually 0.2 to 5.0 mm, preferably 0.3 to 3.0 mm. The width W of the discharge portion of the linear knife electrode is 1.0 mm or less, preferably 0.7 mm or less.
0 mm, preferably 4 to 10 mm. If the above conditions are not satisfied, spark troubles are likely to occur, and the uniformity of the thickness of the molded sheet is deteriorated. The discharge portion may be provided on the entire periphery or in a dotted shape.
（発明の効果） 以上詳述したごとく本発明は、従来の針状タイプの電
極と異なり電気絶縁性被覆を固定して設けた線状または
ナイフ状電極を用いるもので、スパーク耐久性、厚み均
一性及び製膜スピードの向上に関して優れた効果を示す
ものである。(Effects of the Invention) As described in detail above, the present invention uses a linear or knife-shaped electrode provided with an electrically insulating coating fixed thereon unlike the conventional needle-shaped electrode, and has a spark durability and a uniform thickness. This shows an excellent effect on the improvement of the properties and the film forming speed.
以下本発明を実施例により説明する。 Hereinafter, the present invention will be described with reference to examples.
（実施例） 実施例 1. 90mm押出機、300mm幅Ｔダイ、直径が900mmの冷却ロー
ル上に厚み200μのナイロン６シートを押出し、フッ素
樹脂で絶縁被覆したチタン製の線状電極を用いて電荷を
付与し冷却ロールに密着させて製膜した。絶縁被覆層の
絶縁破壊電圧は15KVであった。線状電極の直径は4.0m
m、放電ピッチは10mm放電部の幅は0.5mmであった。(Examples) Example 1. A nylon 6 sheet having a thickness of 200μ is extruded onto a cooling roll having a diameter of 900 mm with a 90 mm extruder, a 300 mm width T-die, and charged using a titanium linear electrode coated with a fluororesin. And a film was formed by closely adhering to a cooling roll. The dielectric breakdown voltage of the insulating coating layer was 15 KV. The diameter of the linear electrode is 4.0m
m, the discharge pitch was 10 mm, and the width of the discharge part was 0.5 mm.
実施例 2. 実施例１において使用電極を、電極先端の厚みが4.0m
mのナイフ状電極を用い、他の条件は変更せずに同様に
製膜した。Example 2 The electrode used in Example 1 was replaced with a 4.0 m thick electrode.
Using a knife-shaped electrode of m, film formation was performed in the same manner without changing other conditions.
実施例 3. 実施例１においてナイロン６の代わりにポリエチレン
テレフタレートを用い又、絶縁破壊電圧8.0KVのセラミ
ックスを被覆し、放電ピッチを3mmにしたタングステン
線状電極を用いて同様に製膜した。Example 3 A film was formed in the same manner as in Example 1 except that polyethylene terephthalate was used instead of nylon 6, and ceramics having a dielectric breakdown voltage of 8.0 KV was coated and a tungsten linear electrode having a discharge pitch of 3 mm was used.
比較例 1. 実施例１において使用電極を真鍮製で直径1.0mm、長
さ12mmの針がピッチ1.0mmで真鍮板に埋めこまれた針状
電極を使用した。Comparative Example 1. The electrode used in Example 1 was made of brass, and needles having a diameter of 1.0 mm and a length of 12 mm embedded in a brass plate at a pitch of 1.0 mm were used.
比較例 2. 実施例１において絶縁被覆しない線状電極を用いた。Comparative Example 2. A linear electrode having no insulation coating in Example 1 was used.
比較例 3. 実施例１において線状電極の絶縁破壊電圧が0.5KVの
フッ素樹脂で絶縁被覆した。Comparative Example 3. In Example 1, the linear electrode was insulated with a fluororesin having a dielectric breakdown voltage of 0.5 KV.
比較例 4. 実施例１において線状電極の直径を0.3mmにして同様
に製膜した。Comparative Example 4. A film was formed in the same manner as in Example 1 except that the diameter of the linear electrode was 0.3 mm.
比較例 5. 実施例１において放電ピッチを25mmにして同様に製膜
した。Comparative Example 5. A film was formed in the same manner as in Example 1 except that the discharge pitch was 25 mm.
比較例 6. 実施例１において放電部の幅を1.5mmにして同様に製
膜した。Comparative Example 6. A film was formed in the same manner as in Example 1 except that the width of the discharge part was 1.5 mm.
以上の結果を表１に示す。 Table 1 shows the above results.
このように実施例では安定製膜最高スピード70m/min
と高く、厚み均一性の優れたフイルムが得られる。Thus, in the embodiment, the maximum speed of stable film formation is 70 m / min.
And a film with high thickness uniformity is obtained.
又、スパークの耐久性の点でも本発明の電極は非常に
優れている。これに対し比較例１の針状電極では安定製
膜最高スピードは50m/minであり、実施例に比較して厚
み変動量スパーク耐久性の点で大幅に劣っている。Also, the electrode of the present invention is extremely excellent in terms of spark durability. On the other hand, the needle-shaped electrode of Comparative Example 1 had a maximum stable film formation speed of 50 m / min, which was significantly inferior in the spark resistance to thickness variation and spark durability as compared with the Example.
本発明方法によると、安定製膜スピードが高く且つ厚
み均一性の優れた重合体フイルムを得ることが出来る。
又、スパーク耐久性が非常に優れた電極を得ることが出
来る。According to the method of the present invention, a polymer film having a high stable film forming speed and excellent thickness uniformity can be obtained.
Also, an electrode having extremely excellent spark durability can be obtained.
第１図、第２図は、本発明の線状電極とナイフ電極の斜
視図を示す。 １、3:電極絶縁部 ２、4:絶縁被覆がなく電極が露出している部分（放電
部）1 and 2 show perspective views of a linear electrode and a knife electrode of the present invention. 1, 3: electrode insulation part 2, 4: part where electrode is exposed without insulation coating (discharge part)
Claims (1)
シート状に溶融押出し冷却する際に、該シートの上方に
配設した電極によって静電荷を付与し、該電極を接地さ
れた冷却ロール面との間に作用する静電気的引力によっ
て前記シートを冷却ロール面に密着させて冷却する方法
において、電極の表面に絶縁破壊電圧1KV以上の電気絶
縁性皮膜を設け、且つ該電極上に1.0mm以下の放電部を
間隔をおいて複数設けた事を特徴とする熱可塑性樹脂シ
ートの製造法。When a thermoplastic resin in a molten state is melt-extruded onto a cooling roll surface in a sheet form and cooled, an electrostatic charge is applied by an electrode disposed above the sheet, and the electrode is grounded. In a method of cooling the sheet by bringing the sheet into close contact with a cooling roll surface by electrostatic attraction acting between the surface and the surface, an electric insulating film having a dielectric breakdown voltage of 1 KV or more is provided on the surface of the electrode, and 1.0 mm is formed on the electrode. A method for producing a thermoplastic resin sheet, wherein a plurality of the following discharge parts are provided at intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63050477A JP2696886B2 (en) | 1988-03-02 | 1988-03-02 | Manufacturing method of thermoplastic resin sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63050477A JP2696886B2 (en) | 1988-03-02 | 1988-03-02 | Manufacturing method of thermoplastic resin sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01222923A JPH01222923A (en) | 1989-09-06 |
| JP2696886B2 true JP2696886B2 (en) | 1998-01-14 |
Family
ID=12859981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63050477A Expired - Fee Related JP2696886B2 (en) | 1988-03-02 | 1988-03-02 | Manufacturing method of thermoplastic resin sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2696886B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6475572B2 (en) | 2000-04-06 | 2002-11-05 | 3M Innovative Properties Company | Electrostatically assisted coating method with focused web-borne charges |
| US6368675B1 (en) | 2000-04-06 | 2002-04-09 | 3M Innovative Properties Company | Electrostatically assisted coating method and apparatus with focused electrode field |
| JP4689847B2 (en) * | 2001-01-31 | 2011-05-25 | 株式会社日本製鋼所 | Corona discharge electrode, corona discharge method and sheet casting machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5125451A (en) * | 1974-08-27 | 1976-03-02 | Mitsubishi Heavy Ind Ltd |
-
1988
- 1988-03-02 JP JP63050477A patent/JP2696886B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01222923A (en) | 1989-09-06 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |