JPH01103421A - Multi-layer die for molding multi-layer film - Google Patents
Multi-layer die for molding multi-layer filmInfo
- Publication number
- JPH01103421A JPH01103421A JP62261869A JP26186987A JPH01103421A JP H01103421 A JPH01103421 A JP H01103421A JP 62261869 A JP62261869 A JP 62261869A JP 26186987 A JP26186987 A JP 26186987A JP H01103421 A JPH01103421 A JP H01103421A
- Authority
- JP
- Japan
- Prior art keywords
- die
- layer
- passage
- multilayer
- lip
- 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.)
- Pending
Links
- 238000000465 moulding Methods 0.000 title description 3
- 229920005989 resin Polymers 0.000 claims abstract description 12
- 239000011347 resin Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 abstract 1
- 238000007788 roughening Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 37
- 229920003002 synthetic resin Polymers 0.000 description 7
- 239000000057 synthetic resin Substances 0.000 description 7
- 229920001684 low density polyethylene Polymers 0.000 description 5
- 239000004702 low-density polyethylene Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000004677 Nylon Substances 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 206010040880 Skin irritation Diseases 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000036556 skin irritation Effects 0.000 description 2
- 231100000475 skin irritation Toxicity 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 1
- 235000002597 Solanum melongena Nutrition 0.000 description 1
- 244000061458 Solanum melongena Species 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 239000002356 single layer Substances 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
- B29C48/30—Extrusion nozzles or dies
- B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
- B29C48/307—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets specially adapted for bringing together components, e.g. melts within the die
-
- 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
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、多層構造のプラスチックフィルム成形用に使
用される多層ダイの改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in multilayer dies used for molding plastic films with multilayer structures.
従来、ダイ内における流路内において、異種の合成樹脂
材料を合流させることにより、多層構造のフィルムを作
り、各単層フィルムの欠点を補いあわせて、より完全な
性質を有するフィルムとするための多層ダイが、一般的
に使用されている。Conventionally, a film with a multilayer structure was created by merging different types of synthetic resin materials in a flow path in a die, and the shortcomings of each single layer film were compensated for to create a film with more perfect properties. Multilayer dies are commonly used.
例えば、低密度ポリエチレン（Ｌ ｏ ｐ Ｅ）は、耐
水性はあるが、気密性は劣っており、一方、ナイロンは
、強度が高く、気密性も優れているが、吸湿性がある。For example, low density polyethylene (L op E) has water resistance but poor airtightness, while nylon has high strength and excellent airtightness but is hygroscopic.
したがって、この両者の優れた特徴を併せもつように、
低密度ポリエチレンとナイロンを貼り合わせて２層のフ
ィルムとすると、強度、耐水性および気密性のすぐれた
フィルムが出来る。Therefore, in order to combine the excellent characteristics of both,
When low-density polyethylene and nylon are bonded together to form a two-layer film, a film with excellent strength, water resistance, and airtightness can be created.
性質の異なる２ｙａのフィルム材料を、多層として互い
に境界面で接合するには、ダイ内の通路内で、粘着性の
合成樹脂を両層の中間に強制的に挿入して、両層を一体
的に結合させる。In order to bond two layers of film materials with different properties at their interfaces, an adhesive synthetic resin is forcibly inserted between the two layers within the passageway in the die, thereby making the two layers integral. be combined with
このような多層フィルムを製造するには、第２図に示す
ように、低密度ポリエチレン（ａ）と、粘着材（ｂ）と
、ナイロン（Ｑ）の供給源に接続された３本の流路（ｄ
）（ｅ）（ｆ）の上端を、合流部（ｇ）で合わせて、１
本の通路（ｈ）とし、多層ダイ（ｉ）の環状スリット（
ｊ）から押出して、３層のなすフィルム（ｋ）とする。To produce such a multilayer film, three channels connected to sources of low density polyethylene (a), adhesive (b), and nylon (Q) are required, as shown in Figure 2. (d
) (e) (f) together at the confluence (g), 1
The passage of the book (h) and the annular slit of the multilayer die (i) (
j) to form a three-layer eggplant film (k).
この合流部（ｇ）からスリット（ｊ）の開口面までの長
さ（ｈ）を、ダイランドと呼び、このダイラン（ｈ）の
長さは、約２５〜５０ｎｗｎとするのが一般的である。The length (h) from this merging part (g) to the opening surface of the slit (j) is called a die land, and the length of this die run (h) is generally about 25 to 50 nwn.
その理由は、３種の合成樹脂を均一に合わせるには、各
層を整流状態で互いに接着するのが望ｉしいため、合流
後にもある程度の助走をさせるために、ダイランドすな
わち整流用通路の長さを、前述したように２５〜５０１
ｍとすると、合流後の樹脂の流れを円滑にできるからで
ある。The reason for this is that in order to uniformly combine the three types of synthetic resins, it is desirable to bond each layer to each other in a rectified state. , as mentioned above, 25 to 501
This is because the resin can flow smoothly after merging if it is m.
このような所要の長さのダイランドを設けることは広く
行われており、また、各種の解説書にも、そのような多
層ダイか記載されている。Providing a die land of such a required length is widely practiced, and various manuals also describe such multilayer dies.
しかしながら、上述したような構造の多層ダイでは、フ
ィルムの肌荒れ（メルトフラクチャー）、透明性の低下
や偏肉等が生じ易く、特に各合成樹脂材の性質の違いか
ら、各流路がら合流部に至るまでの流量差や圧力差が大
きく異なった場合には、均一な３層フィルムが得にくい
という問題点がある。However, in a multilayer die with the above-mentioned structure, roughness of the film (melt fracture), decrease in transparency, uneven thickness, etc. are likely to occur, and in particular, due to the differences in the properties of each synthetic resin material, it is difficult to If the flow rate difference and pressure difference between the steps are significantly different, there is a problem that it is difficult to obtain a uniform three-layer film.
発明者は、多層ダイにおける異種の合成樹脂の合流部に
おいて、各流路からの各合成樹脂の粘性の違いによるズ
レが発生することに着目し、この各層間のズレをなくし
て、均一な多層フィルムを提供しうる多層ダイを開発し
た。The inventor focused on the fact that at the junction of different types of synthetic resins in a multilayer die, misalignment occurs due to the difference in viscosity of each synthetic resin from each flow path, and by eliminating this misalignment between each layer, a uniform multilayer We have developed a multilayer die that can provide films.
また、合流する各層の流量が異なる場合にも。Also, when the flow rates of each converging layer are different.
小量の層が多量の層の圧力に影響されない均一な多層フ
ィルムを得るようにした多層ダイを開発した。We have developed a multilayer die that yields a uniform multilayer film in which the smaller layers are not affected by the pressure of the larger layers.
すなわち、本発明による多層フィルムの成形用の多層ダ
イは、溶融樹脂を供給する複数の流路を、１つの通路に
合流させて、リップ開口より押出すことにより、多層フ
ィルムを成形する多層ダイにおいて、前記流路の合流点
からリップ開口面までの通路の長さを５ｆｆｌ以下とし
てなるものである。That is, in the multilayer die for molding a multilayer film according to the present invention, a plurality of channels for supplying molten resin are merged into one channel and extruded from the lip opening. , the length of the passage from the confluence of the channels to the lip opening surface is 5 ffl or less.
ダイ内における合流する溶融樹脂の流路の合流点から、
リップ開口までの通路の長さが５ｍ以下であるため、合
流した各溶融樹脂が、粘性の差によって、乱流となるの
が防止され、各層を層流状態で押出すことができる。From the confluence point of the merging molten resin flow paths in the die,
Since the length of the path up to the lip opening is 5 m or less, the merged molten resins are prevented from forming a turbulent flow due to the difference in viscosity, and each layer can be extruded in a laminar flow state.
以下、本発明の多層ダイを得るために行った試験結果、
及びこの試験結果より発明された多層ダイについて、第
１表及び第１図に基づき説明する。Below are the test results conducted to obtain the multilayer die of the present invention.
The multilayer die invented based on the test results will be explained based on Table 1 and FIG.
第１図に示す（１）は多層ダイで、溶融樹脂を供給する
べく、３本の流路（２）（３）（４）を、上下をなす１
つの通路（５）の下端に合流させてあり、この通路（５
）の上端は、多層ダイ（１）の上面において、幅（１）
を有する環状のリップ（６）となっている。(1) shown in Fig. 1 is a multilayer die, in which three flow channels (2), (3), and (4) are connected to the upper and lower 1 die to supply molten resin.
It merges with the lower end of two passages (5), and this passage (5
) has a width (1) on the top surface of the multilayer die (1).
It has an annular lip (6).
前記流路（２）（３）（４）の中心軸が交差する合流点
（ｐ）と、多層ダイ（１）の上面（１ａ）との間の整流
用通路の長さ（ｊ２）をダイランドと言う、このダイラ
ンドの長さと、多層フィルムの仕上り品質との関係を調
べるため、各流路（２） （３）（４’）に供給する樹
脂材料の供給圧力を変化させて、下記の表１に示すよう
な結果を得た。The length (j2) of the rectifying passage between the confluence point (p) where the central axes of the flow paths (2), (3), and (4) intersect and the upper surface (1a) of the multilayer die (1) is determined by the die land. In order to investigate the relationship between the length of this die land and the finish quality of the multilayer film, we varied the supply pressure of the resin material supplied to each channel (2), (3), and (4'), and calculated the following table. The results shown in 1 were obtained.
［表１］において、押出し圧力は、毎分の押出スクリュ
ー回転数で表示した。In [Table 1], the extrusion pressure was expressed in extrusion screw rotation speed per minute.
合成樹脂材料は、外層及び内層は共に、低密度ポリエチ
レン（ＬＤＰＥ）、中間層はリニアー低密度ポリエチレ
ン（ＬＬＤＰＥ）とした。ダイ温度は１９０℃、リップ
直径は２００ ｍである。また、ダイ寸法は、Ａはダイ
ランド長さ（Ｑ）＝７８ｍｍ、リップ幅（ｔ）＝３．０
ｍ、以下同様にＢはＱ ＝２０ｍｍ、 ｔ ＝２．５ｍ
、Ｃは２ ＝ ８ ｍｍ、 ｔ ＝２．５＋ｎｍ、Ｄは
Ｑ ＝ ８ ｍｍ、ｔ ＝３．５ｍｎ＋、ＥはＱ ＝
５ ｒｒｎ、 ｔ ＝３．５ｍｍである。なお、フィル
ム仕上結果欄内の評価は、良は０．若干悪しはΔ、不良
はＸと表示した。As for the synthetic resin materials, both the outer layer and the inner layer were made of low density polyethylene (LDPE), and the intermediate layer was made of linear low density polyethylene (LLDPE). The die temperature is 190°C and the lip diameter is 200 m. Also, the die dimensions are A, die land length (Q) = 78 mm, lip width (t) = 3.0
m, and similarly for B, Q = 20 mm, t = 2.5 m
, C is 2 = 8 mm, t = 2.5+nm, D is Q = 8 mm, t = 3.5mn+, E is Q =
5 rrn, t = 3.5 mm. The evaluation in the film finishing result column is 0.0 for good. Slightly poor results were indicated by Δ, and defects were indicated by X.
結果（Ａ）、すなわちダイランド７８ｎｍ、リップ３ｍ
の場合には、外層のみ、あるいは内層のみ圧力の場合（
テストＮ００１〜４）には、フィルム表面に凸条の筋が
出て不良となるが、内層、外層同時押出しを行うと（テ
ストＮＯ，９）の場合には、筋はほとんど出ない。Result (A), i.e. dieland 78nm, lip 3m
In case of pressure only on the outer layer or only on the inner layer (
In Tests No. 001 to 4), protruding streaks appeared on the film surface, resulting in defects, but when the inner and outer layers were simultaneously extruded (Test No. 9), almost no streaks appeared.
この場合には、同樹脂で同押出量のため、ランド部にお
いては、各層の流れは、均衡を保っているため、筋が出
てこないと考えられる。In this case, since the same resin is extruded at the same amount, the flow of each layer is balanced in the land portion, so it is thought that no streaks will appear.
同じように、内層のみから外層を加えて共押ししたとき
、（テストＮｏ、 ９ ）あるいは内層、外層、中間層
の３Ｍを、共に２ＯＲＰＭで押し出した場合（テストＮ
Ｏ，７）には、筋の発生は小さく、最も良好どなる。Similarly, when the outer layer is added to the inner layer and extruded together (Test No. 9), or when the inner layer, outer layer, and middle layer are all extruded at 2ORPM (Test No.
O, 7) has the least amount of streaks and is the best.
結果（Ｂ）、すなわちダイランド２０＋ｎｍ、リップ２
．５ｍｍとした場合において、テストＮＯ，７において
、゛ 肌アレ筋ナシであるがダイマークが出ている。Result (B), i.e. Dyland 20+nm, Lip 2
．． In the case of 5 mm, in test No. 7, there was no skin irritation, but die marks appeared.
この結果、内外層及び中間層の吐出量が同じでも、各樹
脂の粘性の違いにより、圧力差が生じ、このことが原因
で、筋が発生すると推定される。As a result, even if the discharge amounts of the inner and outer layers and the intermediate layer are the same, a pressure difference occurs due to the difference in the viscosity of each resin, and this is presumed to be the cause of streaks.
結果（Ｃ）、すなわちダイランド８Ｉ、リップ２．５ｍ
ｗ＋＋の場合には、どの場合も完全なものはない。Result (C): Dyland 8I, lip 2.5m
In the case of w++, nothing is perfect in any case.
結果（Ｄ）、すなわちダイランド８ｎｍ、リップ３．５
１の場合には、結果（Ｃ）に比べて、リップ幅が広がり
、ランド部の圧力が下がっているため、テストＮＯ，５
及びＮ０１６が良い。Result (D), i.e. Dyland 8nm, Lip 3.5
In the case of 1, the lip width is wider and the pressure on the land is lower than in result (C), so test No. 5
and N016 are good.
このダイランド８ｍにおいては、中間層の圧力が高い場
合、内層＋外層く中間層の場合に良い結果が出ているが
、それぞれの吐出量を調整する必要があり、各層の自由
な組合せが望めないことは明らかである。In this dieland 8m, good results have been obtained when the pressure in the intermediate layer is high and when the inner layer + outer layer is used as the intermediate layer, but it is necessary to adjust the discharge amount of each layer, and it is not possible to freely combine each layer. That is clear.
結果（Ｅ）、すなわちダイランド５ｍｍ、リップ３．５
ｍｍとした場合には１表１に示すように、いずれの組合
せにおいても良い結果が得られており、内外層及び中間
層の吐出量の組合せを自由に選択しても、良質のフィル
ムを得ることができた。Result (E), i.e. dieland 5mm, lip 3.5
As shown in Table 1, good results were obtained in all combinations, and even if the combination of the discharge amounts of the inner and outer layers and the intermediate layer was freely selected, a high-quality film could be obtained. I was able to do that.
以上のように、各実施例での結果から明らかなように、
多層ダイにおけるダイランドに各層の整流用通路を設け
ることが必要であるとされていた常識は誤りであり、む
しろ、ダイランドは短い方が好ましい結果となる。As mentioned above, as is clear from the results of each example,
The common knowledge that it is necessary to provide a rectification passage for each layer in the die land in a multilayer die is wrong; on the contrary, the shorter the die land, the better the result.
すなわち、多層ダイにおいては、ダイランドの整流用通
路を、はぼ零とするか、あるいは好ましくは５Ｉ１１１
以下がよい。That is, in a multilayer die, the rectifying path of the die land should be made almost zero, or preferably 5I111.
The following is good.
なお１本発明は、各層の圧力差が、１対３以上あるいは
圧力差が１対３以上において、特に有効である。Note that the present invention is particularly effective when the pressure difference between the layers is 1:3 or more, or when the pressure difference is 1:3 or more.
本発明は、スリットが環状をなす丸ダイに限らず、吐出
口が直線状をなすＴダイにも使用できる。The present invention can be used not only for a round die with an annular slit, but also for a T die with a straight discharge port.
本発明における多層フィルム成形用の多層ダイでは、整
流用通路を、可能な限り短くすることにより、各層間の
圧力、粘性の影響を取り除くことができるため、肌アレ
あるいは筋等の発生のない良品の多層フィルムを製造で
きる。In the multilayer die for forming a multilayer film according to the present invention, by making the rectification passage as short as possible, it is possible to remove the effects of pressure and viscosity between each layer, resulting in a good product without skin irritation or streaks. multilayer films can be produced.
第１図は、本発明による多層ダイのスリット部を示す一
部切欠縦断面図、−
第２図は、従来の多層ダイのスリット部を示す一部切欠
縦断面図である。
（１）多層ダイ （２）（３）（４）流路（５）
通路 （６）リップ
（Ω）ダイランド （１）幅
第１図
第２図FIG. 1 is a partially cutaway vertical sectional view showing a slit portion of a multilayer die according to the present invention, and FIG. 2 is a partially cutaway longitudinal sectional view showing a slit portion of a conventional multilayer die. (1) Multilayer die (2) (3) (4) Channel (5)
Passage (6) Lip (Ω) Die land (1) Width Figure 1 Figure 2
Claims (1)
せて、リップ開口より押出すことにより、多層フィルム
を成形するようにした多層ダイにおいて、前記流路の合
流点からリップ開口面までの通路の長さを、５ｍｍ以下
としたことを特徴とする多層フィルム成形用の多層ダイ
。In a multilayer die that molds a multilayer film by merging a plurality of channels that supply molten resin into one channel and extruding it from a lip opening, from the confluence of the channels to the lip opening surface. A multilayer die for forming a multilayer film, characterized in that the length of the passage is 5 mm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62261869A JPH01103421A (en) | 1987-10-19 | 1987-10-19 | Multi-layer die for molding multi-layer film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62261869A JPH01103421A (en) | 1987-10-19 | 1987-10-19 | Multi-layer die for molding multi-layer film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01103421A true JPH01103421A (en) | 1989-04-20 |
Family
ID=17367887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62261869A Pending JPH01103421A (en) | 1987-10-19 | 1987-10-19 | Multi-layer die for molding multi-layer film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01103421A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0626246A1 (en) * | 1993-05-25 | 1994-11-30 | General Electric Company | Extrusion head for multilayer parisons of unstable material combinations |
| CN106374130A (en) * | 2015-07-21 | 2017-02-01 | 丰田自动车株式会社 | Method for manufacturing laminated structure |
-
1987
- 1987-10-19 JP JP62261869A patent/JPH01103421A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0626246A1 (en) * | 1993-05-25 | 1994-11-30 | General Electric Company | Extrusion head for multilayer parisons of unstable material combinations |
| CN106374130A (en) * | 2015-07-21 | 2017-02-01 | 丰田自动车株式会社 | Method for manufacturing laminated structure |
| JP2017024242A (en) * | 2015-07-21 | 2017-02-02 | トヨタ自動車株式会社 | Method of manufacturing lamination structure |
| US10124525B2 (en) | 2015-07-21 | 2018-11-13 | Toyota Jidosha Kabushiki Kaisha | Method of manufacturing laminated structure |
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