JPH0829559B2 - Extrusion mold lip structure - Google Patents
Extrusion mold lip structureInfo
- Publication number
- JPH0829559B2 JPH0829559B2 JP1083315A JP8331589A JPH0829559B2 JP H0829559 B2 JPH0829559 B2 JP H0829559B2 JP 1083315 A JP1083315 A JP 1083315A JP 8331589 A JP8331589 A JP 8331589A JP H0829559 B2 JPH0829559 B2 JP H0829559B2
- Authority
- JP
- Japan
- Prior art keywords
- lip
- flow path
- tip
- resin
- resin flow
- 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 - Lifetime
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
- B29C48/27—Cleaning; Purging; Avoiding contamination
- B29C48/272—Cleaning; Purging; Avoiding contamination of dies
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、特にリップカスの発生を抑制した押し出し
成形用金型のリップ構造に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lip structure of an extrusion molding die in which generation of lip residue is suppressed.
（従来の技術） 第３図に示すように、押出成形機の金型１より樹脂膜
10を押出成形するにあたって、金型１のリップの先端部
分に樹脂くず（リップカス）11が付着し、これが堆積す
ると、いわゆる目やに12となり、この目やに12が樹脂膜
10に付着することになって押し出される樹脂膜10は不良
品となることがある。(Prior Art) As shown in FIG. 3, a resin film is formed from a mold 1 of an extruder.
When extrusion molding 10 is performed, resin scraps (lip dregs) 11 are attached to the tip of the lip of the mold 1, and when they are deposited, so-called eyes 12 are formed.
The resin film 10 attached to 10 and extruded may be a defective product.
ところで、従来、金型１のリップを研磨加工する場
合、リップの樹脂押出口側の先端部を余り鋭くすると欠
けや反りを生じやすいので、台４図（ａ）（ｂ）に示す
ようにアール加工14または面取り加工15を施すことが一
般的である。ところが、面取り加工またはアール加工し
たリップ13を用いて、特に粘着性樹脂（例えば、ポリビ
ニルブチラール，エチレン−酢酸ビニル共重合体等）を
押し出し成形する場合には、リップ13先端でリップカス
の発生、堆積が短時間に起こり、不良品が発生するとい
う欠点があった。このため、製品へリップカスが付着す
る前に、定期的に金型１より後の工程を停止させ、金型
１のリップ13を清掃する必要があって生産性が非常に低
下していた。By the way, conventionally, when polishing the lip of the mold 1, if the tip of the lip on the resin extrusion port side is made too sharp, chipping or warpage is likely to occur, so as shown in FIGS. Processing 14 or chamfering 15 is generally performed. However, when chamfered or rounded lip 13 is used, particularly when an adhesive resin (for example, polyvinyl butyral, ethylene-vinyl acetate copolymer, etc.) is extruded and formed, lip residue is generated and accumulated at the tip of lip 13. Occurs in a short time and defective products occur. Therefore, before the lip dregs are attached to the product, it is necessary to regularly stop the steps after the mold 1 and clean the lip 13 of the mold 1, resulting in a great decrease in productivity.
また、リップにカスが付着するのを防止する技術とし
て、リップ表面にフッ素系樹脂等の非粘着性材を塗布
する方法（特開昭58−12743号公報）や、リップ先端
に四フッ化エチレン樹脂で形成された非粘着性部材を取
り付ける方法（特開昭56−95637号公報）が提案されて
いる。In addition, as a technique for preventing dust from adhering to the lip, a method of applying a non-adhesive material such as a fluororesin on the lip surface (Japanese Patent Laid-Open No. 58-12743) or ethylene tetrafluoride at the tip of the lip A method of attaching a non-adhesive member made of resin (Japanese Patent Laid-Open No. 56-95637) has been proposed.
（発明が解決しようとする課題） 上記の方法では、リップ表面に非粘着性材を塗布す
るという特別な工程が必要となり、コストが高くなる欠
点があり、また上記の方法でも非粘着性部材を金型に
取り付ける特別な工程を必要としコスト高になると共
に、清掃がし難くなり、しかも金型に取り付けた一対の
非粘着性部材間の間隔で製品の膜厚が設定されるため、
幅方向の平面度等の精度が低下し、膜厚精度が低下する
という欠点があった。(Problems to be Solved by the Invention) In the above method, a special step of applying a non-adhesive material to the lip surface is required, and there is a disadvantage that the cost becomes high. It requires a special process to attach to the mold, which increases cost, makes cleaning difficult, and because the film thickness of the product is set at the interval between the pair of non-adhesive members attached to the mold,
There is a drawback that accuracy such as flatness in the width direction is lowered and film thickness accuracy is lowered.
本発明は上記の欠点を解決したものであり、従来技術
のように、リップ表面に非粘着性材を塗布したり、非粘
着性部材を取り付けることなく、リップ先端の形状を加
工するだけでリップカスの発生を抑制することができ、
同時にリップカスの製品への付着を抑制することにより
金型リップ先端の清掃周期を大幅に延長することができ
る押し出し成形用金型のリップ構造を提供することを目
的とする。The present invention has solved the above-mentioned drawbacks, and unlike the prior art, without applying a non-adhesive material to the lip surface or attaching a non-adhesive member, the lip scrap can be processed by simply processing the shape of the lip tip. Can be suppressed,
At the same time, it is an object of the present invention to provide a lip structure for an extrusion molding die, which can significantly extend the cleaning cycle of the die lip tip by suppressing the adhesion of lip dregs to the product.
（課題を解決するための手段） リップの樹脂押出口付近にリップカスが付着及び堆積
する理由は、どのようなメカニズムで起きるのかは究明
されていないが、リップの温度、表面状態等に影響され
ることは知られており、上記した従来技術はいずれもこ
れを利用したものである。本発明者らは、リップカスの
付着、堆積は樹脂がリップから押し出される時のバラス
効果に起因すると推察した。つまり、バラス効果により
厚みの広がった樹脂膜の表面がリップ面に接触あるいは
離型を繰り返す間にリップ先端部に残留した樹脂が核と
なってリップカスとして成長、堆積してゆくと考えられ
る。そして、従来技術のように、リップの先端部が面取
り加工またはアール加工されている場合には、樹脂膜が
リップ面に接触し易くなるので、リップカスの発生や堆
積が早くなるものと思われる。(Means for Solving the Problem) Although the reason why the lip residue adheres and accumulates near the resin extrusion opening of the lip has not been clarified, it is affected by the lip temperature, surface condition, etc. It is known that the above-mentioned conventional techniques utilize this. The present inventors presumed that the attachment and deposition of lip dregs was due to the ballast effect when the resin was extruded from the lip. In other words, it is considered that the resin remaining at the tip of the lip grows and accumulates as a lip residue while the surface of the resin film whose thickness has spread due to the ballast effect repeatedly contacts or releases from the lip surface. When the tip portion of the lip is chamfered or rounded as in the prior art, the resin film is likely to come into contact with the lip surface, so that the generation and accumulation of lip dregs are thought to be accelerated.
本発明の押し出し成形用金型のリップ構造は、リップ
先端部の樹脂流路側の面とリップ外面とのなす角度が略
90°であり、リップ先端部の樹脂流路側の面とリップ外
面との交差する稜線部における、樹脂流路側の面の平面
部の稜線部側の端部からリップ外面の延長面までの寸法
と、リップ外面の平面部の稜線部側の端部から樹脂流路
側の面の延長面までの寸法とが共に0.005〜0.1mmである
ことを特徴としており、そのことにより上記目的が達成
される。In the lip structure of the extrusion molding die of the present invention, the angle formed between the surface of the tip of the lip on the resin flow path side and the outer surface of the lip is substantially the same.
It is 90 °, and at the ridge line portion where the surface of the lip tip portion on the resin flow path side and the outer surface of the lip intersect, the dimension from the end portion on the ridge line side of the flat surface portion of the surface of the resin flow path side to the extended surface of the lip outer surface and The dimension from the ridge line side end of the flat surface of the lip outer surface to the extended surface of the resin flow path side surface is both 0.005 to 0.1 mm, which achieves the above object.
以下に、本発明を第１図及び第２図に示す実施例に基
づいて詳細に説明する。The present invention will be described in detail below based on the embodiments shown in FIGS. 1 and 2.
図中１は押し出し成形用金型であり、金型１にはマニ
ホールド７及び溶融樹脂の流路２が設けられ、樹脂流路
２を挟むように金型１先端には上下一対のリップ３、３
が取り付けられている。この実施例ではリップ３、３共
に、流路２の間隔調整に便なるように可動になされてい
る（詳細な構造は図示せず）が、一方のリップ３が金型
１に固定されていてもよい。各リップ３の先端部の樹脂
流路側の面４とリップ外面５とのなす角度αは略90°に
設定されている。リップ３の先端部の樹脂流路側の面４
とリップ外面５とのなす角度αが90°を大きく超える場
合には、上記したように樹脂流路２から押し出された樹
脂膜がリップ面（特に、稜線部６とリップ外面５）に付
着し易くなり、リップカスが発生、堆積し易くなる。角
度αが90°よりかなり小さい場合には、樹脂膜がリップ
面に接触する機会は少なくなるが、特に金型１が樹脂を
下向きに押出すように配設されているとき（図示せず）
は、リップ３の樹脂流路側の面に付着した付着物が重力
によりリップ面に沿って流れ落ちるので、かえって短時
間で樹脂膜に付着する。しかも、この場合にはリップ３
先端部の機械的強度が弱くなり、変形し易くなる欠点が
ある。In the figure, 1 is an extrusion molding die, which is provided with a manifold 7 and a flow path 2 for molten resin in the die 1, and a pair of upper and lower lips 3 at the tip of the die 1 so as to sandwich the resin flow path 2, Three
Is attached. In this embodiment, both of the lips 3 and 3 are movable so as to be convenient for adjusting the distance between the flow paths 2 (detailed structure is not shown), but one of the lips 3 is fixed to the mold 1. Good. An angle α formed between the surface 4 on the resin flow path side at the tip of each lip 3 and the outer surface 5 of the lip is set to about 90 °. Surface 4 of the tip of the lip 3 on the resin flow path side
When the angle α between the outer surface of the lip and the outer surface 5 of the lip greatly exceeds 90 °, the resin film extruded from the resin flow path 2 adheres to the lip surface (in particular, the ridge portion 6 and the outer surface 5 of the lip) as described above. It is easy to generate lip shavings and easily accumulate. When the angle α is much smaller than 90 °, the resin film has less chance of contacting the lip surface, but especially when the mold 1 is arranged so as to push the resin downward (not shown).
In the case of (1), since the adhered matter adhered to the surface of the lip 3 on the resin flow path side flows down along the lip surface due to gravity, it adheres to the resin film in a short time. And in this case, lip 3
There is a defect that the mechanical strength of the tip portion becomes weak and the tip portion is easily deformed.
従って、樹脂流路側の面４とリップ外面５とのなす角
度αは89.0〜91.0°が好ましく、より好ましくは89.7〜
90.3°、さらに好ましくは90°である。Therefore, the angle α formed by the surface 4 on the resin flow path side and the lip outer surface 5 is preferably 89.0 to 91.0 °, more preferably 89.7 to 91.0 °.
It is 90.3 °, more preferably 90 °.
また、樹脂流路側の面４とリップ外面５との交差する
稜線部６はアール加工または面取り加工が施されていな
い。すなわち、リップ３の先端部における樹脂流路側の
面４とリップ外面５はぞれぞれ稜線部６まで平面で形成
されており、特に第２図に示すように、樹脂流路側の面
４の平面部4aの稜線部６側の端部からリップ外面５の延
長面までの寸法Ｌは0.005〜0.1mmとされ、好ましくは0.
005〜0.05mmである。また同様にリップ外面５の平面部5
aの稜線部６側の端部から樹脂流路側の面４の延長面ま
での寸法も0.005〜0.1mmとされ、好ましくは0.005〜0.0
5mmである。一般に、リップ３の各面４、５を通常の方
法で、糸面取り、バフ仕上げ等を行った場合には、Ｌは
0.2〜1.0mmとなる。リップ３の先端部の仕上げ状態につ
いては、欠けや反りが存在すると、その部分に集中的に
リップカスが発生するので、欠けや反りの大きさも上記
した寸法Ｌ以下とするのが好ましい。リップ３の各面
４、５の表面粗さは特に限定されないが、上記したリッ
プカスを抑制する効果を一層確実にするためには、例え
ば、Rmax５μｍ以下とするのがよい。Further, the ridge line portion 6 where the surface 4 on the resin flow path side and the outer surface 5 of the lip intersect is not rounded or chamfered. That is, the surface 4 on the resin flow path side and the outer surface 5 of the lip at the tip of the lip 3 are each formed to be a flat surface up to the ridge line portion 6. In particular, as shown in FIG. The dimension L from the end of the flat surface portion 4a on the ridge line portion 6 side to the extension surface of the lip outer surface 5 is 0.005 to 0.1 mm, and preferably 0.
It is 005 to 0.05 mm. Similarly, the flat surface 5 of the outer lip surface 5
The dimension from the end on the ridge line 6 side of a to the extended surface of the surface 4 on the resin flow path side is also 0.005 to 0.1 mm, and preferably 0.005 to 0.0
It is 5 mm. Generally, when thread chamfering, buffing, and the like are performed on each surface 4, 5 of the lip 3 by a normal method, L is
0.2 to 1.0 mm. Regarding the finished state of the tip portion of the lip 3, if there is a chip or a warp, lip scraps are concentratedly generated in that part. Therefore, the size of the chip or the warp is preferably not more than the above-mentioned dimension L. The surface roughness of each surface 4, 5 of the lip 3 is not particularly limited, but in order to further ensure the effect of suppressing the above-mentioned lip dregs, for example, R max is preferably 5 μm or less.
次に、第４図（ｂ）で示した従来の面取り加工された
リップ13と第２図で示した本発明のリップ３について、
ポリビニルブチラール樹脂を押し出し成形した結果を表
１に示す。表１の結果から、寸法Ｌを小さくするほど、
リップの清掃周期は長くなっていることが確認された。Next, regarding the conventional chamfered lip 13 shown in FIG. 4 (b) and the lip 3 of the present invention shown in FIG.
Table 1 shows the results of extrusion molding of polyvinyl butyral resin. From the results in Table 1, the smaller the dimension L is,
It was confirmed that the lip cleaning cycle was longer.
（発明の効果） このように本発明は、従来のようにリップ表面に非粘
着性材を塗布したり、非粘着性部材を取り付けることな
く、リップ先端の形状を加工するだけでリップカスの発
生を抑制することができ、構成及び生産工程を簡略化し
てコストを低減することができ、また膜厚精度のよい製
品を得ることができる。さらに、リップカスの製品への
付着を抑制することにより金型リップ先端の清掃周期を
大幅に延長することができる。 (Effect of the Invention) As described above, according to the present invention, it is possible to prevent the generation of lip residue simply by processing the shape of the lip tip without applying a non-adhesive material to the lip surface or attaching a non-adhesive member as in the prior art. It is possible to suppress the cost, simplify the configuration and the production process, reduce the cost, and obtain a product with high film thickness accuracy. Further, by suppressing the adhesion of lip dregs to the product, the cleaning cycle of the die lip tip can be greatly extended.
第１図は本発明一実施例の断面図、第２図はそのリップ
の拡大断面図、第３図（ａ）（ｂ）は従来例の断面図と
斜視図、第４図（ａ）（ｂ）はそれぞれ従来例のリップ
の拡大断面図である。 １……金型、２……樹脂流路、３……リップ、４……リ
ップの樹脂流路側の面、５……リップの外面。FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is an enlarged sectional view of its lip, FIGS. 3 (a) and 3 (b) are sectional views and perspective views of a conventional example, and FIG. 4 (a) ( b) is an enlarged cross-sectional view of a lip of a conventional example. 1 ... Mold, 2 ... Resin flow path, 3 ... Lip, 4 ... Lip resin flow path side surface, 5 ... Lip outer surface.
Claims (1)
面とのなす角度が略90°であり、リップ先端部の樹脂流
路側の面とリップ外面とが交差する稜線部における、樹
脂流路側の面の平面部の稜線部側の端部からリップ外面
の延長面までの寸法と、リップ外面の平面部の稜線部側
の端部から樹脂流路側の面の延長面までの寸法とが共に
0.005〜0.1mmであることを特徴とする押し出し成形用金
型のリップ構造。1. A resin flow at a ridge portion where the surface of the lip tip on the resin flow path side and the outer surface of the lip form an angle of about 90 °, and the surface of the lip tip on the resin flow path intersects the outer surface of the lip. The dimension from the ridge line side end of the flat portion of the road side surface to the extension surface of the lip outer surface and the dimension from the ridge line side end of the flat portion of the lip outer surface to the resin flow path side surface extension surface both
Lip structure of extrusion mold characterized by 0.005 to 0.1 mm.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1083315A JPH0829559B2 (en) | 1989-03-31 | 1989-03-31 | Extrusion mold lip structure |
| AU52285/90A AU621471B2 (en) | 1989-03-31 | 1990-03-28 | A method for the manufacture of thermoplastic resin sheets |
| US07/500,988 US5151234A (en) | 1989-03-31 | 1990-03-29 | Method for the manufacture of thermoplastic resin sheets |
| CA002013383A CA2013383C (en) | 1989-03-31 | 1990-03-29 | Method for the manufacture of thermoplastic resin sheets |
| EP90303416A EP0390578B1 (en) | 1989-03-31 | 1990-03-30 | Method of manufacturing thermoplastic resin sheets |
| MX020116A MX171902B (en) | 1989-03-31 | 1990-03-30 | A METHOD FOR THE MANUFACTURE OF THERMOPLASTIC RESIN SHEETS |
| DE69009270T DE69009270T2 (en) | 1989-03-31 | 1990-03-30 | Process for the production of thermoplastic plastic films. |
| KR1019900004314A KR0133519B1 (en) | 1989-03-31 | 1990-03-30 | Method of manufacturing thermoplastic resin sheets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1083315A JPH0829559B2 (en) | 1989-03-31 | 1989-03-31 | Extrusion mold lip structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02261622A JPH02261622A (en) | 1990-10-24 |
| JPH0829559B2 true JPH0829559B2 (en) | 1996-03-27 |
Family
ID=13798992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1083315A Expired - Lifetime JPH0829559B2 (en) | 1989-03-31 | 1989-03-31 | Extrusion mold lip structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0829559B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4913995B2 (en) * | 2004-09-01 | 2012-04-11 | 積水化学工業株式会社 | Manufacturing method of optical film |
| JP4841924B2 (en) * | 2005-10-07 | 2011-12-21 | 積水化学工業株式会社 | Optical film molding die and optical thermoplastic resin film manufacturing method |
| JP7167613B2 (en) * | 2018-10-03 | 2022-11-09 | 住友ゴム工業株式会社 | Die plate and rubber extrusion device |
| JP7243111B2 (en) * | 2018-10-03 | 2023-03-22 | 住友ゴム工業株式会社 | Die plate and rubber extrusion device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5695637A (en) * | 1979-12-29 | 1981-08-03 | Matsushita Electric Works Ltd | Structure of die for extrusion molding |
| JPS613609U (en) * | 1984-06-12 | 1986-01-10 | 雄三 小尾 | Fluorescent light |
| JPS6136349U (en) * | 1984-08-09 | 1986-03-06 | 新日本製鐵株式会社 | Erosion-resistant immersion nozzle |
| JPS6243849A (en) * | 1985-08-20 | 1987-02-25 | Tdk Corp | Photomagnetic recording medium |
| JPS6254650A (en) * | 1985-09-03 | 1987-03-10 | Katsushi Tanaka | Automatic processing machine for household material |
-
1989
- 1989-03-31 JP JP1083315A patent/JPH0829559B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02261622A (en) | 1990-10-24 |
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