JPH02265729A - Molding of t-die film - Google Patents
Molding of t-die filmInfo
- Publication number
- JPH02265729A JPH02265729A JP1087677A JP8767789A JPH02265729A JP H02265729 A JPH02265729 A JP H02265729A JP 1087677 A JP1087677 A JP 1087677A JP 8767789 A JP8767789 A JP 8767789A JP H02265729 A JPH02265729 A JP H02265729A
- Authority
- JP
- Japan
- Prior art keywords
- die
- film
- movable
- molding
- speed
- 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.)
- Granted
Links
- 238000000465 moulding Methods 0.000 title claims abstract description 25
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 15
- 238000001125 extrusion Methods 0.000 abstract description 8
- 229920005989 resin Polymers 0.000 abstract description 7
- 239000011347 resin Substances 0.000 abstract description 7
- 239000000155 melt Substances 0.000 abstract description 6
- -1 polyethylene Polymers 0.000 abstract description 4
- 239000004698 Polyethylene Substances 0.000 abstract description 2
- 229920000573 polyethylene Polymers 0.000 abstract description 2
- 239000004743 Polypropylene Substances 0.000 abstract 1
- 229920001155 polypropylene Polymers 0.000 abstract 1
- 229920005672 polyolefin resin Polymers 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
Landscapes
- 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〕
本発明は熱可塑性樹脂をTダイから溶融押出して、フィ
ルム(シート)を成形するTダイフィルムの成形方法に
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for forming a T-die film by melt-extruding a thermoplastic resin through a T-die to form a film (sheet).
従来、熱可塑性樹脂なTダイフィルム成形装置を用いて
フィルムを成形することは行われており、該熱可塑性樹
脂フィルムに延伸処理等を施して、熱可塑性樹脂の分子
の配向を起させると、その配向方向の強度が著しく増大
すること、及びこの延伸処理を熱可塑性樹脂フィルムの
縦横方向に同一の延伸率をもって行うことにより、熱可
塑性樹脂フィルムは強度に方向性をもたない高強度のも
のとなることも知られている。Conventionally, films have been formed using thermoplastic resin T-die film forming equipment, and when the thermoplastic resin film is subjected to stretching treatment etc. to cause orientation of the molecules of the thermoplastic resin, The strength in the orientation direction increases significantly, and by performing this stretching treatment at the same stretching rate in the longitudinal and lateral directions of the thermoplastic resin film, the thermoplastic resin film has high strength without any directionality. It is also known that
これを利用して強度の大きな熱可塑性樹脂フィルムを製
造するための方法が提案されている。A method for manufacturing a thermoplastic resin film with high strength by utilizing this has been proposed.
例えば、−軸方向に分子配向したフィルムを互いに配向
方向が交差するようにはりあわせて強度的に方向をもた
ない高強度のフィルムを得る方法が挙げられる。For example, a method for obtaining a high-strength film having no direction in terms of strength by laminating films whose molecules are oriented in the -axis direction so that their orientation directions intersect with each other can be mentioned.
しかしながらこの方法ではフィルム貼り合せのため、フ
ィルムの肉厚が増加するばかりでなく、製膜工程と貼り
合せ工程が必要であり、かつ、操作が煩雑である等の欠
点を有している。However, this method not only increases the thickness of the film due to the bonding of the films, but also requires a film forming process and a bonding process, and has drawbacks such as complicated operations.
本発明者等は、かかる従来のTグイ成形装置を用いて高
強度のフィルムを得る技術上の問題点を解消し、衝撃強
度及び引っ張り強度の改善された熱可塑性樹脂、特にポ
リオレフィン樹脂フィルムを効率よく、且つ安定して製
造し得る方法につき鋭意検討を重ねた結果、Tダイのリ
ップが押出されたフィルムの幅方向に沿って移動できる
Tダイを用いて、該リップな特定の速度で移動させなか
らTダイ成形をする事により、縦・横方向にほぼ等配向
した引っ張り強度に優れたフィルムが得られる事を見出
し、本発明を完成するに至った。The present inventors solved the technical problems of obtaining a high-strength film using such conventional T-guid forming equipment, and efficiently produced a thermoplastic resin film, particularly a polyolefin resin film, with improved impact strength and tensile strength. As a result of extensive research into a method that can be produced easily and stably, we have developed a method that uses a T-die whose lip can move along the width direction of the extruded film, and moves the lip at a specific speed. Therefore, the inventors discovered that by performing T-die molding, a film with excellent tensile strength and substantially uniform orientation in the vertical and horizontal directions could be obtained, and the present invention was completed.
すなわち、本発明の要旨は、成形温度におけろメルトフ
ローインデックスが30g/10分以下の熱可塑性樹脂
をTダイ成形するにあたり、を用い、該可動リップの両
方又は一方を、下記(1)式で示される速度指数(S)
の値以上で、かつ#−フィルムの成形方法に存する。That is, the gist of the present invention is that when T-die molding a thermoplastic resin having a melt flow index of 30 g/10 minutes or less at a molding temperature, both or one of the movable lips is formed according to the following formula (1). Speed index (S) denoted by
or more, and #- depends on the method of forming the film.
を
但し G:線状スリットの幅Cmx)
MFI :成形温度におけるメルトフローインデックス
Cg/10分)
t:フィルム厚み(朋)
S;速度指数(朋/分)
以下、本発明の詳細な説明する。However, G: Width of linear slit (Cmx) MFI: Melt flow index at molding temperature Cg/10 min) t: Film thickness (mm) S: Speed index (mm/min) The present invention will be described in detail below.
本発明で用いられる熱可塑性樹脂としては、通常Tダイ
フィルム成形に用いられるものであれば何でもよく、例
えば、ポリエチレン、ポリプロピレン、エチレン−プロ
ピレン共重合体、ポリブテン−/、エチレン酢酸ビニル
共重合体等のポリオレフィン系樹脂、ナイロン等のポリ
アミド系樹脂、ポリスチレン等のスチレン系樹脂、ポリ
塩化ビニル等の塩化ビニル系樹脂等が挙げられる。The thermoplastic resin used in the present invention may be any resin that is normally used for T-die film molding, such as polyethylene, polypropylene, ethylene-propylene copolymer, polybutene/ethylene-vinyl acetate copolymer, etc. Examples include polyolefin resins such as nylon, polyamide resins such as nylon, styrene resins such as polystyrene, and vinyl chloride resins such as polyvinyl chloride.
上記熱可塑性樹脂としては、成形温度におけるメルトフ
ローインデックスが、通常309//θ分以下、好まし
くは0.0.2〜/ 0 、!iI// 0分、さらに
好ましくは0.03〜17g/10分の範囲のものが用
いられる。メルトフローインデックスが上限より太きい
と本質的にメルトテンションが不足して成膜安定性が不
良となり、且つフィルム物性も低下するので好ましくな
い。The above-mentioned thermoplastic resin has a melt flow index at the molding temperature of usually 309//θ min or less, preferably 0.0.2 to 0. iI//0 minutes, more preferably in the range of 0.03 to 17 g/10 minutes. If the melt flow index is larger than the upper limit, the melt tension is essentially insufficient, resulting in poor film formation stability and poor film properties, which is not preferable.
本発明においてメルトフローインデックス(MFI)と
はJISKA760に準拠し、成形時の温度で測定した
値である。In the present invention, the melt flow index (MFI) is a value measured at the temperature during molding in accordance with JISKA760.
また、本発明に使用される↑グイフィルム成形装置とし
ては、通常用いられる形式のものならいずれでも使用可
能であるが、成形ダイは通常のTダイとは異なり、ダイ
スリノ:・(て設けられたダイリップを押出方向と交差
する方向(フィルムの1陽方向)に沿って、移動できる
可、肋リップを備えたTダイか用いられる。ダイリップ
はダイスリットの両!till共可動とするのが良いが
、一方のみ可動のりソッとしても良い。In addition, as the ↑Gui film forming device used in the present invention, any type of normally used type can be used, but the forming die is different from a normal T-die, and a die lino: The die lip can be moved along the direction intersecting the extrusion direction (the first direction of the film), or a T-die with a cost lip is used.It is preferable that the die lip is movable on both sides of the die slit. However, only one side may be movable.
本発明で用いられるダイの一例を第7図及び第2図に示
す。An example of a die used in the present invention is shown in FIGS. 7 and 2.
第1図において、ダイ/は押出しスリットを挾んでフィ
ルムの幅方向だ、各リップがスライド移動させ得る構造
とされている。In FIG. 1, the die has a structure in which each lip can be slid in the width direction of the film across the extrusion slit.
本発明においては、熱可塑性樹脂を上記したTダイを装
着したTグイフィルム成形装置を用いて特定の成形条件
で成形する。In the present invention, a thermoplastic resin is molded under specific molding conditions using a T-gui film molding apparatus equipped with the above-mentioned T-die.
まずTダイフィルム成形装置の可動リップ−と3の少く
とも一方はフィルムの幅方向(押出方向と交差する方向
)に往復動させている為、ダイスリットから押出された
フィルムは押出方向とりノブの移動方向の複合された方
向に配向される事となるのでフィルム全体としては斜め
に分子配向したフィルムが得られる。このフィルムの分
子配向の程度は可動ダイリップの移動速度、樹脂の押出
速度及び引取速度等を調整することにより、適宜選択決
定される。なお、可動リップの両方を往復動させる場合
には、相互に反対方向に運動させるのが均一な分子配向
を与える上で好ましい。First, at least one of the movable lips and 3 of the T-die film forming device is reciprocated in the width direction of the film (direction that intersects the extrusion direction), so the film extruded from the die slit is moved by the extrusion direction control knob. Since the molecules are oriented in a combination of the moving directions, the film as a whole has obliquely oriented molecules. The degree of molecular orientation of this film is appropriately selected and determined by adjusting the moving speed of the movable die lip, the extrusion speed of the resin, the take-up speed, etc. Note that when both movable lips are moved back and forth, it is preferable to move them in opposite directions in order to provide uniform molecular orientation.
更に、第2図に示した装置は可動ダイリップ2(3)を
無端ベルトとしたものであり、この場合には第1図のよ
うにダイリップを往復動させることなく、連続的に走行
させることができる。Furthermore, in the device shown in FIG. 2, the movable die lip 2 (3) is an endless belt, and in this case, the die lip can be run continuously without reciprocating as shown in FIG. can.
本発明においては、フィルムの引張強度が優れたフィル
ムを製造する為に、可動ダイリップλ及び3の移動の相
対速度(可動ダイリノプコ及び3を同時に反対方向に移
動させる場合は両者の移動速度の和、あるいはいずれか
一方のみを移動させる時はその移動速度)を下記(11
式で示される速度指数(S)の値以上で、且つ、S値の
10倍以下、好ましくはS値の7.2倍〜IO倍、更に
好ましくはS値の3倍〜/θ倍の範囲内に調節して行な
う。In the present invention, in order to produce a film with excellent tensile strength, the relative speed of movement of the movable die lip λ and 3 (if the movable die lip and 3 are moved simultaneously in opposite directions, the sum of the moving speeds of both, Or, if only one of them is moved, its movement speed) is shown below (11
The speed index (S) value shown by the formula is more than or equal to 10 times the S value, preferably 7.2 times to IO times the S value, and more preferably 3 times to /θ times the S value. Adjust to within.
ここで S:速度指数(mt/分)
Gコ線状スリットの幅(m諺)
MFI :成形温度におけるメルトフローインデックス
C9710分)
t:フィルム厚み(朋)
を表わす。Here, S: Speed index (mt/min) G: Width of linear slit (m) MFI: Melt flow index at molding temperature C9710 min) t: Film thickness (m).
なお、上記の速度指数(S)は本発明の成形操作条件の
重要な指数であり、使用樹脂の流動性(MFI)、フィ
ルム厚み(1)、使用ダイのスリット幅(G)により、
両サイドのリップの必要な相対移動速度(mm/分〕を
規定するものである。The speed index (S) mentioned above is an important index of the molding operation conditions of the present invention, and depends on the fluidity (MFI) of the resin used, the film thickness (1), and the slit width (G) of the die used.
This defines the required relative movement speed (mm/min) of the lips on both sides.
上記に規定した移動速度が速度指数(S)よりも小さな
移動速度の場合には得られるフィルムの強度は、従来の
Tダイ成形品と大差がな(、本発明の効果を十分発揮し
得ない。また、該移動速度が速度指数(S)の70倍よ
り多い場合には、得られるフィルムの物性面でのデメリ
ット:よないものの、成形装置の耐久性の点からやや問
題となる恐れがあり好ましくない。When the moving speed specified above is smaller than the speed index (S), the strength of the obtained film is not much different from that of conventional T-die molded products (the effects of the present invention cannot be fully exhibited). In addition, if the moving speed is more than 70 times the speed index (S), there may be some disadvantages in terms of physical properties of the obtained film, but it may cause some problems in terms of the durability of the molding equipment. Undesirable.
また、樹脂の押出速度及び引取速度は通常Tダイ成形で
行われる程度の速度とされる。ポリオレフィン樹脂を用
いてTダイ成形する場合の成形条件としては成形温度を
樹脂の懺点十10’C〜300℃、望ましくは/70−
.270’Cでドラフト率をl〜/θO1望ましくは/
〜kOの範囲の成形条件で行われる。Further, the extrusion speed and withdrawal speed of the resin are set to the same speed as normally performed in T-die molding. When performing T-die molding using polyolefin resin, the molding temperature is 110'C to 300°C, preferably /70-300°C.
.. At 270'C, the draft rate is l~/θO1 preferably/
It is carried out under molding conditions in the range of ~kO.
実施例/
高圧法低密度ポリエチレン(密度: 0.92 弘、!
i’ / cs3、メルトインデックス(=メルトフロ
インデックス)=2.ogyio分)を大阪精機■g
xi o 96型押出機に線状スリット幅(ダイリップ
のギャップ) 0.7 m1mで且つ線状スリットの両
サイドの各リップを押出方向に交差する方向Tダイ成形
機を用い、成形温度/90℃、成形温度のMF I 2
.Og// 0分、ドラフト率:itI及び表/に示す
移動速度の条件下で50μのTダイ成形フィルムを製造
した。Example/ High-pressure low-density polyethylene (density: 0.92 Hiroshi!
i'/cs3, melt index (=melt flow index)=2. Osaka Seiki ■g
Using a xi o 96 type extruder with a linear slit width (die lip gap) of 0.7 m1m and a T-die molding machine in a direction that intersects the extrusion direction with each lip on both sides of the linear slit, molding temperature / 90 ° C. , MFI 2 at molding temperature
.. A 50 μm T-die formed film was produced under the conditions of Og//0 minutes, draft rate: itI, and moving speed shown in Table/.
得られたフィルムを下記の測定法にて評価した。結果を
表/に示す。The obtained film was evaluated by the following measuring method. The results are shown in Table/.
引張り強度
フィルムを短冊状に切り取り、引張り試験機にて!r0
0mrtt/分にて引張り、フィルムが切断する時の強
度を読みとる。Cut the tensile strength film into strips and use a tensile tester! r0
Pull at 0 mrtt/min and read the strength when the film is cut.
JISZ l 70.2 ドラフト率(DR) ρmご溶融時の比容積 ρf:フィルムの比容積 Gコダイギャップ t、フィルム厚み 衝撃強度 ダートドロップインパクト法 A、STM D / 709 破断する際の平均の荷重(g)で示す。JISZ 70.2 Draft rate (DR) ρm specific volume when melted ρf: specific volume of film G Kodai Gap t, film thickness impact strength dirt drop impact method A, STM D/709 It is expressed as the average load (g) at the time of rupture.
落下距離はλA 1nch
実施例λ〜J
実施例/において移動速度を表7に示す条件に変化させ
て行なったこと以外は同様に行った。The falling distance was λA 1 nch Examples λ to J The same procedure as in Example/ was performed except that the moving speed was changed to the conditions shown in Table 7.
結果を表/に示す。The results are shown in Table/.
比較例/〜コ
実施例/VCおいて、移動速度を表/に示す条件に変化
させて行なったこと以外は同様に行った。結果を表/に
示す。Comparative Example/-Example/VC were carried out in the same manner except that the moving speed was changed to the conditions shown in Table/. The results are shown in Table/.
ダ
表/の結果より明らかなように、可動ダイリップの移動
速度が上記速度指数S以上ではフィルムの引っ張り強度
はMD方向〜TD方向のバランスが良化し、衝撃強度も
向上する。As is clear from the results in Table 1, when the moving speed of the movable die lip is equal to or higher than the speed index S, the tensile strength of the film is better balanced between the MD and TD directions, and the impact strength is also improved.
又、可動ダイリップの移動をどちらか一方のみ、又は同
時に行っても物性への寄与にほとんど差がないことが判
った。Furthermore, it was found that there is almost no difference in the contribution to the physical properties even if the movable die lip is moved only on one side or at the same time.
本発明の方法によれば引っ張り強度のバランス及び衝撃
強度の改善されたフィルムを製造することができる。According to the method of the present invention, it is possible to produce a film with improved balance of tensile strength and impact strength.
第1図、第2図は本発明の方法に用いられるダイの一部
破断概略説明図である。
図中lはダイ、コ及び3はダイリップをそれぞれ示す。1 and 2 are partially cutaway schematic illustrations of a die used in the method of the present invention. In the figure, l indicates a die, C and 3 indicate a die lip, respectively.
Claims (1)
0g/10分以下の熱可塑性樹脂をTダイ成形するにあ
たり、Tダイのリップの一方又は両方がフィルムの幅方
向に移動し得る可動リップとされたTダイを用い、該可
動リップの両方又は一方を、下記(1)式で示される速
度指数(S)の値以上で、かつ該速度指数(S)の10
倍以下の相対速度で移動させながら成形する事を特徴と
するTダイフィルムの成形方法。 S=(π×30×G×MFI^0^.^2)/t 但しG:環状スリットの幅 MFI:成形温度におけるメルトフローインデックス(
g/10分) t:フィルム厚み S:速度指数(mm/分)(1) Melt flow index at molding temperature is 3
When performing T-die molding of a thermoplastic resin of 0 g/10 minutes or less, one or both of the lips of the T-die is a movable lip that can move in the width direction of the film, and both or one of the movable lips is used. is greater than or equal to the value of the speed index (S) shown by the following formula (1), and 10 of the speed index (S)
A method for forming a T-die film, characterized by forming the film while moving at a relative speed of less than double the relative speed. S=(π×30×G×MFI^0^.^2)/t However, G: Width of annular slit MFI: Melt flow index at molding temperature (
g/10 min) t: Film thickness S: Speed index (mm/min)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1087677A JP2780041B2 (en) | 1989-04-06 | 1989-04-06 | Method for forming T-die film |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1087677A JP2780041B2 (en) | 1989-04-06 | 1989-04-06 | Method for forming T-die film |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02265729A true JPH02265729A (en) | 1990-10-30 |
JP2780041B2 JP2780041B2 (en) | 1998-07-23 |
Family
ID=13921567
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1087677A Expired - Fee Related JP2780041B2 (en) | 1989-04-06 | 1989-04-06 | Method for forming T-die film |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2780041B2 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63173620A (en) * | 1987-01-14 | 1988-07-18 | Mitsubishi Kasei Corp | Forming process for film of thermoliquid crystalline polymer |
-
1989
- 1989-04-06 JP JP1087677A patent/JP2780041B2/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63173620A (en) * | 1987-01-14 | 1988-07-18 | Mitsubishi Kasei Corp | Forming process for film of thermoliquid crystalline polymer |
Also Published As
Publication number | Publication date |
---|---|
JP2780041B2 (en) | 1998-07-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4923650A (en) | Breathable microporous film and methods for making it | |
US5008296A (en) | Breathable microporous film | |
US6706228B2 (en) | Process for producing polyolefin microporous breathable film | |
US6740184B2 (en) | High speed method of making plastic film and nonwoven laminates | |
TWI239978B (en) | High speed method of making microporous film products | |
DE69109860T2 (en) | LIGHTWEIGHT POLYPROPYLENE FILM AND METHOD FOR THE PRODUCTION THEREOF. | |
EP1765572B1 (en) | Method and apparatus for uniformly stretching thermoplastic film | |
US6656581B2 (en) | Incrementally stretched non-embossed films having high moisture vapor transmission rates (MVTRs) | |
US4626574A (en) | Linear low density polyethylene film and method of making | |
SA516380252B1 (en) | Breathable and Microporous Thin Thermoplastic Film | |
US6951591B2 (en) | High speed method of making plastic film and nonwoven laminates | |
GB1105983A (en) | A method and apparatus for the preparation of a composite thermoplastic resinous article | |
US3539439A (en) | Polyolefin laminates | |
JPH02503540A (en) | Linear low density polyethylene casting film | |
US6413346B1 (en) | Production of stretch plastic film | |
US4000234A (en) | Process for the manufacture of polyolefin film | |
US3429959A (en) | Method of making foils of thermoplastic synthetic materials | |
JPH02265729A (en) | Molding of t-die film | |
US3608042A (en) | Process for producing a film of splitfibre forming polymeric material | |
DE3880187T2 (en) | METHOD FOR PRODUCING A POLYACETAL FILM. | |
JPS5957720A (en) | Manufacture of thermoplastic resin sheet or film | |
GB1328255A (en) | Process and apparatus for stretching films of polymeric material | |
JP3375580B2 (en) | Thermoplastic resin sheet manufacturing apparatus and method for manufacturing the sheet using the same | |
JPS6174819A (en) | Manufacture of polyethylene oriented film | |
JPH10180864A (en) | Manufacture of polyolefin molding |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |