JPH0764017B2 - Horizontal stretching method for plastic film - Google Patents
Horizontal stretching method for plastic filmInfo
- Publication number
- JPH0764017B2 JPH0764017B2 JP22654989A JP22654989A JPH0764017B2 JP H0764017 B2 JPH0764017 B2 JP H0764017B2 JP 22654989 A JP22654989 A JP 22654989A JP 22654989 A JP22654989 A JP 22654989A JP H0764017 B2 JPH0764017 B2 JP H0764017B2
- Authority
- JP
- Japan
- Prior art keywords
- film
- pressure
- stretching machine
- transverse stretching
- plastic film
- 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
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明はプラスチックフィルムの横延伸方法に関し、詳
細には横延伸機におけるフィルム随伴流を低減させ、フ
ィルムの熱収縮性の悪化及び昇華物等の吹出しによるフ
ィルムの汚れを防止し、高品質のプラスチックフィルム
を製造することのできる横延伸方法に関するものであ
る。TECHNICAL FIELD The present invention relates to a method for transversely stretching a plastic film, and more specifically, it reduces film wake flow in a transverse stretching machine, deteriorates heat shrinkability of the film, and sublimates. The present invention relates to a transverse stretching method capable of producing a high-quality plastic film by preventing the film from being contaminated by the blowing of the film.
［従来の技術］ 第３図はプラスチックフィルム製造装置の一例を示す平
面説明図であり、押出し機２より供給される溶融ポリマ
ーはまずＴ型−ダイ装置３から吐出されて厚目のフィル
ム１に成形される。次いで縦延伸機４へ送給されて加熱
しながら縦方向に所定倍率に延伸され、続いて横延伸機
５に導いて横方向に所定倍率に延伸される。該横延伸機
５は予熱部5a,延伸部5b及び熱処理部5cから構成されて
おり、各部毎に夫々の処理に適した温度にフィルムを加
熱する。すなわち該横延伸機５内には熱風供給ダクト5
1,52,53が設けられると共に、排気ダクト51a,52a,53aが
設けられる。そして該横延伸機５を通過したフィルム１
は冷却部６を経て巻取機８に巻取られる。[Prior Art] FIG. 3 is a plan view showing an example of a plastic film manufacturing apparatus, in which a molten polymer supplied from an extruder 2 is first discharged from a T-die apparatus 3 to form a thick film 1. Molded. Then, it is fed to the longitudinal stretching machine 4 and stretched in the longitudinal direction to a predetermined ratio while being heated, and then guided to the transverse stretching machine 5 and stretched in the lateral direction to a predetermined ratio. The transverse stretching machine 5 is composed of a preheating section 5a, a stretching section 5b and a heat treatment section 5c, and heats the film to a temperature suitable for each processing. That is, the hot air supply duct 5 is installed in the transverse stretching machine 5.
1, 52, 53 are provided, and exhaust ducts 51a, 52a, 53a are provided. The film 1 that has passed through the transverse stretching machine 5
Is taken up by the winder 8 via the cooling unit 6.
ところで上記横延伸機５の出口側においては、第４図に
示す様にフィルム１の上下両面の近接気体がフィルム１
の高速走行に追随し随伴流（鎖線矢印B,Bに示す）とし
て横延伸機５の外部へ高速で放出され、次工程の冷却部
６にまで達する。上記横延伸機５内においては前述した
通りフィルムが加熱されており、機室内の熱風中には未
反応モノマーやオリゴマー或は各種添加剤等の蒸発成分
又は昇華成分等が含まれており、この熱風が冷却部６で
急冷されるとオリゴマー等が凝固してフィルム面上に付
着し、フィルムの品質を劣化させる原因にもなってい
た。By the way, on the outlet side of the transverse stretching machine 5, as shown in FIG.
Following the high-speed running, the high-speed discharge is carried out to the outside of the transverse stretching machine 5 as an accompanying flow (indicated by chain line arrows B and B) and reaches the cooling section 6 in the next step. The film is heated in the transverse stretching machine 5 as described above, and the hot air in the machine chamber contains evaporation components or sublimation components such as unreacted monomers and oligomers or various additives. When the hot air is rapidly cooled in the cooling unit 6, the oligomer and the like solidify and adhere to the surface of the film, which causes deterioration of the quality of the film.
また上記横延伸機５の入口側においても同様に随伴流が
発生し、大気中の空気を機室内に吸い込んで予熱部5aや
延伸部5b等における温度調節を乱し、フィルムの熱収縮
率にばらつきを生じて品質の低下を引き起こしていた。Similarly, an accompanying flow is also generated at the inlet side of the transverse stretching machine 5, which sucks air in the atmosphere into the machine chamber to disturb the temperature control in the preheating section 5a, the stretching section 5b, etc. There was variation, which caused deterioration of quality.
この様な横延伸機５における随伴流の悪影響を抑制する
方法としては、熱風供給ダクト51,52,53及び排気ダクト
51a,52a,53aの給排風量を調整する方法が採用されてい
たが、排気ダクト51a,52a,53a中に設けられたフィルタ
ーの目詰りや、外気圧力の変動（例えば横延伸機５の設
置建屋におけるドアの開閉による圧力変動）等により、
前記随伴流の圧力や流量が変動するため、随伴流による
影響を満足し得るレベルまで低減することはできていな
い。A hot air supply duct 51, 52, 53 and an exhaust duct can be used as a method of suppressing the adverse effect of the accompanying flow in the transverse stretching machine 5.
Although the method of adjusting the supply / exhaust air volume of 51a, 52a, 53a was adopted, clogging of the filter provided in the exhaust ducts 51a, 52a, 53a and fluctuations in the outside air pressure (for example, installation of the horizontal stretching machine 5) Due to pressure fluctuations caused by opening and closing doors in the building)
Since the pressure and flow rate of the associated flow vary, the effect of the associated flow cannot be reduced to a satisfactory level.
［発明が解決しようとする課題］ 本発明は上記事情に鑑み、横延伸機の入口側及び出口側
における随伴流を可及的に抑制し、随伴流によって生じ
る上記プラスチックフィルムの汚れや熱収縮性の悪化を
防止し、高品質のプラスチックフィルムを安定して製造
することのできる方法の提供を目的とするものである。[Problems to be Solved by the Invention] In view of the above circumstances, the present invention suppresses the associated flow on the inlet side and the outlet side of a transverse stretching machine as much as possible, and stains and heat shrinkability of the plastic film caused by the associated flow. It is an object of the present invention to provide a method capable of preventing the deterioration of the resin and stably producing a high quality plastic film.
［課題を解決するための手段］ 上記目的を達成し得た本発明は、横延伸機におけるフィ
ルム入口側及び出口側に夫々独立した圧力調整室を設
け、入口側圧力調整室の圧力をPin,出口側圧力調整室の
圧力をPoutとしたとき、 Pout−Pin≦0.01〜2mmH2O の範囲内に設定すると共に、前記設定された圧力差の変
動幅を±0.1mmH2Oの範囲内に抑えることを要旨とするも
のである。[Means for Solving the Problems] The present invention that has achieved the above object is to provide independent pressure adjusting chambers on the film inlet side and the film outlet side of a transverse stretching machine, respectively, and adjust the pressure of the inlet side pressure adjusting chamber to P in When the pressure in the outlet side pressure adjustment chamber is P out , set it within the range of P out −P in ≦ 0.01 to 2 mmH 2 O and set the fluctuation range of the set pressure difference to ± 0.1 mmH 2 O. The gist is to keep it within the range.
［作用］ 本発明は横延伸機の入口側及び出口側に夫々圧力調整室
を設けると共に、入口側圧力調整室の圧力Pinと出口側
圧力調整室の圧力Poutにおける圧力差Pout−Pinを0.01
〜2mmH2Oの範囲内とすることとした。すなわち上記圧力
差が0.01〜2mmH2Oの範囲内にあるときには、出口側調整
室から入口側調整室に向けて随伴流を打ち消す様な適度
な気流が形成されることになり、これによって随伴流に
よる悪影響を排除できる様になる。なおPout−Pinが0.0
1mmH2Oより低く設定されたときには、圧力差がほとんど
ないためにフィルム走行による随伴流の形成を防止する
ことにはならず、他方Pout−Pinが2mmH2Oを超えると入
口側と出口側の間で生じる気流とフィルムの随伴流が干
渉して複雑な乱流が生じてフィルムの安定走行に悪影響
を与えることになるため、フィルム品質をかえって低下
することになる。[Operation] In the present invention, the pressure adjusting chambers are provided on the inlet side and the outlet side of the transverse stretching machine, respectively, and the pressure difference P out -P between the pressure P in of the inlet side pressure adjusting chamber and the pressure P out of the outlet side pressure adjusting chamber. in 0.01
It was decided to be within the range of up to 2 mmH 2 O. That is, when the pressure difference is within the range of 0.01 to 2 mmH 2 O, an appropriate airflow is formed from the outlet side adjustment chamber toward the inlet side adjustment chamber so as to cancel out the associated flow, which causes the associated flow. It becomes possible to eliminate the adverse effects of. Note that P out −P in is 0.0
When it is set lower than 1 mmH 2 O, there is almost no pressure difference, so that the formation of a wake by film running cannot be prevented.On the other hand, when P out −P in exceeds 2 mmH 2 O, the inlet side and the outlet side Since the air flow generated between the sides and the accompanying flow of the film interfere with each other to generate a complicated turbulent flow, which adversely affects the stable running of the film, the film quality is rather deteriorated.
上記圧力差Pout−Pinのさらに好ましい範囲は0.05〜1mm
H2Oとすることが推奨される。The more preferable range of the pressure difference P out -P in is 0.05 to 1 mm.
H 2 O is recommended.
他方前記の様に設定された圧力差の変動範囲は0.1mmH2O
以下としなければならず、このことにより、横延伸機内
における環境変動が小さくなるので、横延伸機内の温度
制御は安定して行なえる様になり、フィルムの熱収縮率
のばらつきが低減されて均質なフィルム加工ができる様
になる。On the other hand, the fluctuation range of the pressure difference set as above is 0.1 mmH 2 O
The following must be satisfied, and this reduces environmental fluctuations in the transverse stretching machine, so that the temperature control in the transverse stretching machine can be performed stably, and the variation in the heat shrinkage rate of the film is reduced, resulting in a uniform distribution. It becomes possible to process various films.
［実施例］ 第１図は本発明方法に使用する横延伸機の実施例を示す
側面側面図である。フィルム１は横延伸機５及び冷却部
６を水平方向に貫通して白抜矢印方向に走行する様に構
成される。横延伸機５のフィルム入口側及び出口側には
夫々入口側圧力調整室5A及び出口側圧力調整室5Bが配設
される。各圧力調整室5A,5Bには夫々加圧用ポンプ56a,5
6b及び減圧用ポンプ57a,57bが接続されると共に、圧力
検出装置55a,55bが配設される。そして該圧力検出装置5
5a,55bは制御装置54に接続されると共に、該制御装置54
は前記加圧用ポンプ56a,56b及び減圧ポンプ57a,57bの作
動を制御する様に制御系によって接続される。[Examples] Fig. 1 is a side view showing an example of a transverse stretching machine used in the method of the present invention. The film 1 is configured so as to pass through the transverse stretching machine 5 and the cooling unit 6 in the horizontal direction and run in the direction of the white arrow. An inlet side pressure adjusting chamber 5A and an outlet side pressure adjusting chamber 5B are provided on the film inlet side and the film outlet side of the transverse stretching machine 5, respectively. Pressurizing pumps 56a and 5a are installed in the pressure adjusting chambers 5A and 5B, respectively.
6b and the decompression pumps 57a, 57b are connected, and pressure detection devices 55a, 55b are provided. And the pressure detecting device 5
5a and 55b are connected to the control device 54 and
Are connected by a control system so as to control the operation of the pressurizing pumps 56a, 56b and the depressurizing pumps 57a, 57b.
例えば第２図は上記装置の運転時における入口側圧力調
整室5Aの圧力Pinと出口側圧力調整室5Bの圧力Poutとの
間に生じる圧力差PSの挙動を示すグラフである。上記圧
力差PSは出口側圧力Poutが0.5mmH2O高くなる様に設定さ
れると共に、その変動幅は±0.1mmH2Oに設定される。即
ち時刻t1において該圧力差PSの変動が0.5−0.1（mmH
2O）に達する直前に、制御装置54によって減圧用ポンプ
57a及び／又は加圧用ポンプ56bを作動し、圧力差PSが設
定値である0.5mmH2Oに回復した時点t2でこの作動を停止
する。For example, FIG. 2 is a graph showing the behavior of the pressure difference P S generated between the pressure P in of the inlet side pressure adjusting chamber 5A and the pressure P out of the outlet side pressure adjusting chamber 5B during the operation of the above apparatus. The pressure difference P S is set so that the outlet side pressure P out is increased by 0.5 mmH 2 O, and the fluctuation range thereof is set to ± 0.1 mmH 2 O. That is, at time t 1 , the fluctuation of the pressure difference P S is 0.5-0.1 (mmH
Just before reaching 2 O), the decompression pump is controlled by the controller 54.
57a and / or the pressurizing pump 56b is operated, and this operation is stopped at time t 2 when the pressure difference P S is restored to the set value of 0.5 mmH 2 O.
この様な制御を行なって入口側圧力調整室5Aの圧力Pin
及び出口側圧力調整室5Bの圧力Poutを調節することによ
り、圧力差Psの変動範囲を設定された値に保つ。なお上
記圧力調整室5A,5B内の圧力Pin,Poutは機外の圧力及び
熱風供給ダクト51,52,53と排気ダクト51a,52a,53aの風
量並びに圧力を考慮して選定することが好ましく、これ
によってフィルムの温度制御及び随伴流の流量等を適確
に制御できる様になる。By performing such control, the pressure P in of the inlet side pressure adjusting chamber 5A
By adjusting the pressure P out of the outlet side pressure adjusting chamber 5B, the fluctuation range of the pressure difference Ps is maintained at the set value. The pressures P in and P out in the pressure adjusting chambers 5A and 5B may be selected in consideration of the pressure outside the machine and the air volume and pressure of the hot air supply ducts 51, 52, 53 and the exhaust ducts 51a, 52a, 53a. Preferably, this makes it possible to appropriately control the temperature control of the film and the flow rate of the accompanying flow.
［発明の効果］ 本発明は以上の様に構成されることにより、横延伸機の
入口側から侵入する随伴流を低減できる様になり、フィ
ルムの温度制御を安定して行なえフィルムの熱収縮性の
悪化を抑制できる様になった。[Advantages of the Invention] With the configuration of the present invention as described above, it is possible to reduce the accompanying flow that enters from the inlet side of the transverse stretching machine, and the temperature of the film can be stably controlled. It became possible to control the deterioration of.
また横延伸機の出口側よりフィルム随伴流として漏出す
る熱風量を少なくすることができ、該熱風中に含有され
ている昇華物等が凝固してフィルム面に付着するといっ
たことは低減され、高品質で均質なプラスチックフィル
ムを製造できる様になった。Further, it is possible to reduce the amount of hot air leaked as a film accompanying flow from the exit side of the transverse stretching machine, and it is reduced that sublimates and the like contained in the hot air are solidified and adhere to the film surface. It is now possible to produce quality and homogeneous plastic films.
第１図は本発明方法に使用する横延伸機の側面説明図、
第２図は第１図の装置を使用した制御例を示すグラフ、
第３図はプラスチックフィルムの製造装置の例を示す平
面説明図、第４図は横延伸機の出口側におけるフィルム
随伴流を示す説明図である。 １……フィルム、２……押出し機 ３……Ｔ型−ダイ装置、４……縦延伸機 ５……横延伸機、６……冷却部 ８……巻取機 51,52,53……熱風供給ダクト 51a,52a,53a……排気ダクト、54……制御装置 55a,55b,55c……圧力検出装置 56a,56b……加圧用ポンプ 57a,57b……減圧用ポンプFIG. 1 is a side view of a transverse stretching machine used in the method of the present invention,
FIG. 2 is a graph showing an example of control using the apparatus of FIG.
FIG. 3 is a plan explanatory view showing an example of a plastic film manufacturing apparatus, and FIG. 4 is an explanatory view showing a film accompanying flow on the outlet side of a transverse stretching machine. 1 ... Film, 2 ... Extruder 3 ... T type-die device, 4 ... Longitudinal stretching machine 5 ... Horizontal stretching machine, 6 ... Cooling unit 8 ... Winding machine 51, 52, 53 ... Hot air supply duct 51a, 52a, 53a …… Exhaust duct, 54 …… Control device 55a, 55b, 55c …… Pressure detection device 56a, 56b …… Pressurization pump 57a, 57b …… Decompression pump
Claims (1)
て、横延伸機におけるフィルム入口側及び出口側に夫々
独立した圧力調整室を設け、入口側圧力調整室の圧力を
Pin,出口側圧力調整室の圧力をPoutとしたとき、 Pout−Pin≦0.01〜2mmH2O の範囲内に設定すると共に、前記設定された圧力差の変
動幅を±0.1mmH2Oの範囲内に抑えることを特徴とするプ
ラスチックフィルムの横延伸方法。1. A method for laterally stretching a plastic film, wherein independent pressure adjusting chambers are provided on the film inlet side and the film outlet side of the horizontal stretching machine, and the pressure in the inlet side pressure adjusting chamber is adjusted.
When the pressure in the P in , outlet side pressure adjustment chamber is P out , set it within the range of P out −P in ≦ 0.01 to 2 mmH 2 O, and set the fluctuation range of the set pressure difference to ± 0.1 mmH 2 A method for transversely stretching a plastic film, characterized by keeping the content within the range of O.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22654989A JPH0764017B2 (en) | 1989-08-31 | 1989-08-31 | Horizontal stretching method for plastic film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22654989A JPH0764017B2 (en) | 1989-08-31 | 1989-08-31 | Horizontal stretching method for plastic film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0387238A JPH0387238A (en) | 1991-04-12 |
| JPH0764017B2 true JPH0764017B2 (en) | 1995-07-12 |
Family
ID=16846898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22654989A Expired - Fee Related JPH0764017B2 (en) | 1989-08-31 | 1989-08-31 | Horizontal stretching method for plastic film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0764017B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10090500B2 (en) * | 2016-09-20 | 2018-10-02 | Sumitomo Chemical Company, Limited | Film-stretching apparatus and method of producing film |
| WO2018180565A1 (en) | 2017-03-28 | 2018-10-04 | 東レ株式会社 | Airflow control device and method for manufacturing stretched film |
| DE102018124521A1 (en) * | 2018-10-04 | 2020-04-09 | Brückner Maschinenbau GmbH & Co. KG | Treatment plant for a flexible material web that can be passed through a treatment furnace, in particular plastic film |
| DE102018127073A1 (en) * | 2018-10-30 | 2020-04-30 | Brückner Maschinenbau GmbH & Co. KG | Film stretching machine |
| JP7096940B1 (en) * | 2021-09-10 | 2022-07-06 | 日東電工株式会社 | Method for manufacturing stretched film and method for manufacturing optical laminate |
-
1989
- 1989-08-31 JP JP22654989A patent/JPH0764017B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0387238A (en) | 1991-04-12 |
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