JPH0246994Y2 - - Google Patents
Info
- Publication number
- JPH0246994Y2 JPH0246994Y2 JP1984159849U JP15984984U JPH0246994Y2 JP H0246994 Y2 JPH0246994 Y2 JP H0246994Y2 JP 1984159849 U JP1984159849 U JP 1984159849U JP 15984984 U JP15984984 U JP 15984984U JP H0246994 Y2 JPH0246994 Y2 JP H0246994Y2
- Authority
- JP
- Japan
- Prior art keywords
- air
- cooling ring
- air cooling
- die
- ring
- 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 37
- 238000007664 blowing Methods 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 239000010408 film Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 9
- 102100027340 Slit homolog 2 protein Human genes 0.000 description 3
- 101710133576 Slit homolog 2 protein Proteins 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 3
- 229920006255 plastic film Polymers 0.000 description 3
- 239000012530 fluid Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Description
【考案の詳細な説明】
本考案は、インフレーシヨンフイルム成形用空
気冷却リングに関するものである。特に、ポリオ
レフイン樹脂等の熱可塑性樹脂をインフレーシヨ
ン法で管状フイルムに成形するにあたり、高吐
出、高ブロー比でバブルの安定性や偏肉精度が良
く、得られたフイルムが高透明、高フイルム強度
を持つように操作できるインフレーシヨンフイル
ム成形用冷却装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air cooling ring for blown film forming. In particular, when molding thermoplastic resins such as polyolefin resins into tubular films using the inflation method, high discharge and high blow ratios result in good bubble stability and thickness unevenness accuracy, and the resulting films are highly transparent and highly resistant. This invention relates to a cooling device for forming blown film that can be operated to maintain strength.
通常、空気冷却リングを用いたインフレーシヨ
ンフイルム成形は第１図に示したような冷却方法
が一般に用いられている。即ち、溶融樹脂押出ダ
イ１のダイスリツト２を介してダイリツプ３より
押出されたフイルムバブル１３は流体圧によつて
膨張されながら、空気冷却リング１１を介して送
られる加圧された冷却用空気により冷却される。
空気冷却リング１１は押出ダイ上に載つた冷却リ
ング支持板４により支持されている。空気冷却リ
ング１１により画成された通路の空気出口１４に
は、通常下側空気吹出リツプ８と上側空気吹出リ
ツプ１２が円心状に設置されている。この方法に
よる、高吐出フイルム加工では、当然冷却用空気
量は多く必要とする。しかし、多量の冷却用空気
を吹出出口１４から出した場合、ダイリツプ３と
空気吹出口１４との間にベンチユリー効果が働
き、バブルの形状や空気の流れむら等によりバブ
ルがゆれて不安定になる。 Normally, in inflation film molding using an air cooling ring, a cooling method as shown in FIG. 1 is generally used. That is, the film bubble 13 extruded from the die lip 3 through the die slit 2 of the molten resin extrusion die 1 is expanded by fluid pressure and cooled by pressurized cooling air sent through the air cooling ring 11. be done.
The air cooling ring 11 is supported by a cooling ring support plate 4 which rests on the extrusion die. At the air outlet 14 of the passage defined by the air cooling ring 11, a lower air outlet lip 8 and an upper air outlet lip 12 are generally arranged in a circular manner. In high discharge film processing using this method, a large amount of cooling air is naturally required. However, when a large amount of cooling air is discharged from the air outlet 14, a ventilating effect acts between the die lip 3 and the air outlet 14, causing the bubble to sway and become unstable due to the shape of the bubble, uneven air flow, etc. .
上記欠点を克服するため、第２図に示す様に、
空気冷却リングの下面１０と空気冷却リング支持
体４によつて形成された空気流路９をもつ装置が
知られている。該空気流路９は、冷却空気リング
を通して流れる加圧された冷却空気によつて誘導
される該空気流路９を通る外気からの空気流をお
こさせる様に配置されている。空気流路９を誘導
されて流れる空気量は調整ボルト５の上下によつ
て調整される。 In order to overcome the above drawbacks, as shown in Figure 2,
Devices with an air channel 9 formed by the underside 10 of the air cooling ring and the air cooling ring support 4 are known. The air passage 9 is arranged to cause an air flow from outside air through the air passage 9 to be induced by pressurized cooling air flowing through the cooling air ring. The amount of air guided and flowing through the air flow path 9 is adjusted by moving the adjustment bolt 5 up and down.
また、空気流路９は、第３図に示す様に、空気
冷却リングの支持板リング４の下面とダイ１の上
面によつて形成されていてもよい。この方法によ
り高吐出時でもバブルの安定性は非常に良好にな
る。 Further, the air flow path 9 may be formed by the lower surface of the support plate ring 4 of the air cooling ring and the upper surface of the die 1, as shown in FIG. This method provides very good bubble stability even at high discharge rates.
特に、第４図に示したような円錐型の上側吹出
リツプ１２を用いた場合に高吐出、高ブロー比で
も安定してフイルム加工が可能である。 In particular, when a conical upper blowing lip 12 as shown in FIG. 4 is used, stable film processing is possible even at high discharge and high blowing ratios.
しかし、第４図の冷却方法によるインフレーシ
ヨンフイルムの円周方向の偏肉精度は悪く、第１
図の一般のフイルム加工法では±10〜15％（フイ
ルム厚み25μ）であるのに対し、同方法では、±
15％〜±20％であつた。このため薄いフイルムで
は極部的にはしわの発生がみられた。この原因に
ついて種々検討の結果、外部からの誘導空気の流
れむら、温度むらがあり、これらの誘導空気がダ
イスリツト２から出てくる溶融樹脂に直接触れる
ことによることがわかつた。 However, the accuracy of thickness deviation in the circumferential direction of the blown film using the cooling method shown in Fig. 4 is poor, and the
In the general film processing method shown in the figure, it is ±10 to 15% (film thickness 25μ), but with the same method, ±
It was 15% to ±20%. For this reason, wrinkles were observed in some areas of the thin film. As a result of various investigations into the cause of this problem, it was found that there were uneven flows and temperatures of the induced air from the outside, and that this induced air came into direct contact with the molten resin coming out of the die slit 2.
本考案はかかる点に鑑みてなされたもので、本
考案のインフレーシヨン成形装置の一具体例を第
５図に基いて説明する。 The present invention has been devised in view of these points, and a specific example of the inflation molding apparatus of the present invention will be described with reference to FIG.
１はインフレーシヨンダイであり、溶融樹脂出
口であるダイリツプ３と円心円状に空気冷却リン
グ１１が設置されている。空気冷却リング１１の
下面１０と空気冷却リング支持板４の間に外部か
らの誘導空気が空気流路９より取入れられる。空
気量の調整は調整ボルトで行う。ダイスリツト２
と空気冷却リングの下側空気吹出リツプ８の間に
円筒状カラー６を設ける。この方法により、流れ
むらや温度むらのある冷却空気を直接バブル１３
に触れさせないで該円筒状カラー６に当つてから
バブル１３に触れさせることができる。 Reference numeral 1 denotes an inflation die, in which an air cooling ring 11 is installed concentrically with a die lip 3 serving as a molten resin outlet. Induced air from the outside is taken in between the lower surface 10 of the air cooling ring 11 and the air cooling ring support plate 4 through the air flow path 9. The amount of air is adjusted using the adjustment bolt. Dice list 2
A cylindrical collar 6 is provided between the lower air outlet lip 8 of the air cooling ring and the lower air outlet lip 8 of the air cooling ring. With this method, cooling air with uneven flow and temperature can be directly transferred to the bubble 13.
It is possible to touch the bubble 13 after hitting the cylindrical collar 6 without touching the bubble 13.
該円筒状カラーの設置する位置はダイスリツト
２側に近くなるとバブル１３が触れる恐れがある
ため、下側空気吹出リツプ８に近い方が良い。高
さは下側空気吹出リツプ８の空気吹出位置より低
い方が良い。この方法により高吐出、高ブロー比
でも偏肉精度の良い高品質のフイルムが得られる
ようになつた。 The position where the cylindrical collar is installed is preferably close to the lower air blowing lip 8, since there is a risk that the bubble 13 will come into contact with it if it is close to the die slit 2 side. The height is preferably lower than the air blowing position of the lower air blowing lip 8. This method has made it possible to obtain high-quality films with good thickness deviation accuracy even at high discharge rates and high blow ratios.
第６図は、外部からの誘導空気の取入方法のみ
が第５図と異なる。第６図の方法は外部からの誘
導空気は、空気冷却リング支持板４とダイ１の間
から取入れている。その効果は第５図の方法と全
く同じである。 FIG. 6 differs from FIG. 5 only in the method of taking in induced air from the outside. In the method shown in FIG. 6, induced air from the outside is taken in from between the air cooling ring support plate 4 and the die 1. The effect is exactly the same as the method shown in FIG.
第１図は、一般的なインフレーシヨンフイルム
成形装置の縦断面図である。第２図は、プラスチ
ツクフイルム成形装置において、誘導空気流路が
形成されているものの縦断面図である。第３図
は、第２図の空気流路の位置が少しことなつた同
様なタイブのプラスチツクフイルム成形装置の縦
断面図である。第４図は、円錐状の上部空気吹出
リツプを有する以外は第２図と同様なプラスチツ
クフイルム成形装置の縦断面図である。第５図及
び第６図は、本考案のインフレーシヨンフイルム
成形装置の縦断面図である。
１：溶融樹脂押出ダイ、２：ダイスリツト、
３：ダイリツプ、４：冷却リング支持板、５：調
整ボルト、６：円筒状カラー、７：空気吹出口、
８：下側空気吹出リツプ、９：誘導空気流、１
０：空気冷却リングの下部ベース、１１：空気冷
却リング、１２：上側空気吹出リツプ、１３：フ
イルムバブル、１４：空気冷却リング出口。
FIG. 1 is a longitudinal sectional view of a general inflation film forming apparatus. FIG. 2 is a longitudinal sectional view of a plastic film forming apparatus in which a guiding air passage is formed. FIG. 3 is a longitudinal cross-sectional view of a plastic film forming apparatus of a similar type to that of FIG. 2, but with a slightly different position of the air passages. FIG. 4 is a longitudinal cross-sectional view of a plastic film forming apparatus similar to FIG. 2 except that it has a conical upper air blowing lip. 5 and 6 are longitudinal sectional views of the blown film forming apparatus of the present invention. 1: Molten resin extrusion die, 2: Die slit,
3: Die lip, 4: Cooling ring support plate, 5: Adjustment bolt, 6: Cylindrical collar, 7: Air outlet,
8: Lower air outlet lip, 9: Induced air flow, 1
0: lower base of air cooling ring, 11: air cooling ring, 12: upper air blowing lip, 13: film bubble, 14: air cooling ring outlet.
Claims (1)
から円筒状に押出されるバブルを冷却する空気
冷却リングにおいて、該空気冷却リングから吹
出される冷却用空気によつて誘導されるように
該空気冷却リングの下側に空気流路を設け、ダ
イ円形スリツトと空気冷却リングの空気吹出リ
ツプの間に、ダイの上面に円心状にかつバブル
に平行して円筒状カラーを設けたことを特徴と
するインフレーシヨンフイルム成形装置。 (2) 空気流路が空気冷却リングの下面と空気冷却
リング支持板によつて形成され、該空気流路の
空気出口が下側空気冷却排出リツプと支持板リ
ングの内側に円心状に設置されている円筒状カ
ラーによつて形成されている実用新案登録請求
の範囲第１項記載の成形装置。 (3) 空気流路が空気冷却リングの下部と溶融樹脂
押出ダイの表面によつて形成され、該空気流路
の空気出口が支持板の内側端と該溶融樹脂押出
ダイの上面に円心状に設置されている円筒状カ
ラーによつて形成されている実用新案登録請求
の範囲第１項記載の成形装置。[Claims for Utility Model Registration] (1) In an air cooling ring that cools a bubble extruded into a cylindrical shape from a circular slit of an inflation molding die, the cooling air blown out from the air cooling ring An air flow path is provided on the underside of the air cooling ring so as to be guided, and between the die circular slit and the air blowing lip of the air cooling ring, a cylindrical air passage is provided on the upper surface of the die in a circular manner and parallel to the bubble. An inflation film forming device characterized by having a collar. (2) An air flow path is formed by the lower surface of the air cooling ring and the air cooling ring support plate, and the air outlet of the air flow path is arranged in a circular manner inside the lower air cooling discharge lip and the support plate ring. The molding device according to claim 1, which is formed by a cylindrical collar. (3) An air passage is formed by the lower part of the air cooling ring and the surface of the molten resin extrusion die, and the air outlet of the air passage is formed in a circular manner between the inner end of the support plate and the upper surface of the molten resin extrusion die. The molding device according to claim 1, which is formed by a cylindrical collar installed in a cylindrical collar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984159849U JPH0246994Y2 (en) | 1984-10-24 | 1984-10-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984159849U JPH0246994Y2 (en) | 1984-10-24 | 1984-10-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6177225U JPS6177225U (en) | 1986-05-23 |
| JPH0246994Y2 true JPH0246994Y2 (en) | 1990-12-11 |
Family
ID=30717794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984159849U Expired JPH0246994Y2 (en) | 1984-10-24 | 1984-10-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0246994Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57115320A (en) * | 1980-06-30 | 1982-07-17 | Union Carbide Corp | Method and apparatus for cooling film bubble of low strain curing polymer |
-
1984
- 1984-10-24 JP JP1984159849U patent/JPH0246994Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57115320A (en) * | 1980-06-30 | 1982-07-17 | Union Carbide Corp | Method and apparatus for cooling film bubble of low strain curing polymer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6177225U (en) | 1986-05-23 |
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