JPS59128170A - Film winding core - Google Patents

Abstract

PURPOSE:To discharge air rolled into the inner layer part during winding a film and prevent wrinkling in a roll by using a drum-shaped winding core which has the center of the largest diameter and both ends of the smallest diameter, and also has the ratio, of specified value, of the difference between said largest diameter and smallest diameter to the largest diameter. CONSTITUTION:When the largest outside diameter of the center or its vicinity is A, and the smallest outside diameter of both ends or their vicinitites is B, and further (A-B)/AX100 is R, R is made to be 0.05-1.0, preferably 0.05-0.8. When R exceeds 1.0 at this time, the film is slackened in the vicinities of both ends of the winding core and easily wrinkled. When R is below 0.05, it is deformed because of contraction and abrasion as frequency in use of core becomes high, and the center or its vicinity becomes smaller in the outside diameter than those of both ends or their vicinities, and further the air becomes to easily stay between layers of the film in the vicinity of the center to easily cause wrinkle. By the abovementioned method, even if the breadth of winding is wide, air between wound layers is discharged and wrinkling can be prevented.

Description

【発明の詳細な説明】 この発明は、フィルムの巻取機全般、とくにスリッター
において、フィルムを巻取る際に使用するフィルム巻取
用コアに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film winding core used for winding a film in a film winding machine in general, and a slitter in particular.

フィルムの巻取において、良好な巻姿や、きす、シワな
どのない良好な品質を有する巻取ロールを得るためには
、フィルム巻取中の張力、接圧を適正範囲に調整して管
理する必要があることは勿論であるが、これと共に巻取
コアの形状や寸法精度を管理することも重要である。こ
のため、巻取コアについては、従来より円柱度、真円度
、振れなどに一定規準を設け、その管理範囲内のものを
使用している。In film winding, in order to obtain a winding roll with good winding appearance and good quality without scratches or wrinkles, the tension and contact pressure during film winding must be adjusted and controlled within appropriate ranges. Of course, this is necessary, but it is also important to control the shape and dimensional accuracy of the winding core. For this reason, conventionally certain standards have been set for the winding core in terms of cylindricity, roundness, runout, etc., and those within the control range have been used.

しかし、このように管理された巻取コアを用いても、従
来、フィルム巻巾が広いと巻込み空気が逃げにくくなり
、内層部にシワが発生し易かった。However, even if a winding core controlled in this manner is used, conventionally, when the film winding width is wide, it is difficult for the trapped air to escape, and wrinkles are likely to occur in the inner layer portion.

特に、巻取用コアが使用中、経時的に収縮および摩耗を
起して第１図および第２図の如く中央またはその近傍が
凹むと、フィルムにシワがより発生し易くなっていた。Particularly, when the winding core shrinks and wears over time during use and becomes depressed at or near the center as shown in FIGS. 1 and 2, wrinkles are more likely to occur in the film.

すなわち、第１図のごとく、巻取用コア１の中央２また
はその近傍の外径が、両端３．３′またはその近傍の外
径（１６４，８ｍｍ）より１００μ収縮したものでは、
このコアに巻取ったフィルムの内層部に、軽微であるが
シワが発生するのである。また、第２図のごとく、巻取
用コア４の中央５またはその近傍の外径が、両端６．６
′またはその近傍の外径（１６４，１３ｍ）より２００
μ収縮したものでは、このコアに巻取ったフィルムの内
層部に、著しく目立ったシワが発生するのである。That is, as shown in FIG. 1, if the outer diameter of the winding core 1 at or near the center 2 is smaller than the outer diameter (164.8 mm) at or near both ends 3.3',
Wrinkles, although slight, occur in the inner layer of the film wound around this core. Further, as shown in FIG. 2, the outer diameter of the center 5 of the winding core 4 or its vicinity is 6.6 mm at both ends.
200 from the outer diameter (164, 13m) at or near
In the case of μ-shrinked film, extremely noticeable wrinkles occur in the inner layer of the film wound around this core.

そこで、シワ発生を防止するために、第３図の如く中央
７の外径を両端８．８′の外径より大きくした接圧ロー
ル９を用い、接圧ロール９の中央７を巻取用コア１０の
中央１１に強く圧接しながら巻取ることにより、巻込ま
れた空気を排出するようすることが試みられたが、良好
な巻姿を持つ巻取ロールが得られなかった。Therefore, in order to prevent the occurrence of wrinkles, a contact pressure roll 9 is used in which the outer diameter of the center 7 is larger than the outer diameter of both ends 8.8' as shown in Fig. 3, and the center 7 of the contact pressure roll 9 is used for winding. Attempts have been made to discharge the trapped air by winding the core 10 while strongly pressing against the center 11 of the core 10, but a winding roll with a good winding appearance has not been obtained.

発明者らは、このような事情に鑑み、前記の欠点を解消
すべく種々検討した。その結果、巻取ロールにお１ける
シワの発生は巻取時内層部に巻き込まれた空気が巻取ロ
ールから経時的に抜けて行くことに起因して起きること
、一旦ロール内に保持された空気はロールを圧するとい
うだけでは抜けるものではないこと、したがって巻き込
まれた空気がロール内に保持されないようにすることが
重要であることを確認した。そこで、巻取コアの形状が
重要な要因となることに鑑み、その形状を空気が自動的
かつ直ちに排出し易い形状とすれば、シワ発生が防止し
得るのではないかとの見通しに基き、さらに研究を進め
た。その結果、巻取用コアの形状を、中央またはその近
傍から両端またはその近傍に向って外径を漸減させた太
鼓型にすることとすれば、巻込み空気が中央またはその
近傍に溜まらずに自動的かつ直ちに排出され、内層シワ
が発生せず、巻取ロールの巻姿および品質共にすぐれた
ものが得られるとの確認を得て、この発明を完成するに
至ったものである。In view of these circumstances, the inventors have conducted various studies in order to eliminate the above-mentioned drawbacks. As a result, wrinkles on the take-up roll are caused by the air that is caught in the inner layer during winding and escapes from the take-up roll over time. We confirmed that air cannot escape simply by applying pressure to the rolls, and that it is therefore important to prevent trapped air from being retained within the rolls. Therefore, considering that the shape of the winding core is an important factor, and based on the prospect that wrinkles could be prevented if the shape was made to allow air to be easily and automatically discharged, we further I proceeded with my research. As a result, if the winding core is shaped like a drum with an outer diameter that gradually decreases from the center or its vicinity to both ends or its vicinity, the entrained air will not accumulate at or near the center. This invention was completed after confirming that the take-up roll can be automatically and immediately discharged, wrinkles do not occur in the inner layer, and the winding roll has excellent winding appearance and quality.

すなわち、この発明は、中央またはその近傍から両端ま
たはその近傍に向かって外径を漸減させた太鼓型コアで
あって、中央またはその近傍の最大外径をＡ１両端また
はその近傍の最小外径をＢ、　　（（Ａ−Ｂ）／Ａ）Ｘ
１００をＲとしたとき、Ｒが０．０５から１．０である
フィルム巻取用コアを要旨としている。That is, the present invention provides a drum-shaped core whose outer diameter gradually decreases from the center or the vicinity thereof toward both ends or the vicinity thereof, where the maximum outer diameter at or near the center is the minimum outer diameter at or near both ends of A1. B, ((A-B)/A)X
When R is 100, the core is a film winding core in which R is 0.05 to 1.0.

以下、これについて図面に基き詳細に説明する。Hereinafter, this will be explained in detail based on the drawings.

第４図はこの発明にかかる巻取用コアの一実施例をあら
れす側面図である。図にみるようにこの巻取用コア１２
は、全体としては従来と同様に円柱形（中空すなわち円
筒を含む）であるが、中央１３から両端１４．１４’に
向って外径が漸減した太鼓型の形状を有している。第５
図はこの発明にかかる巻取用コアの他の実施例をあられ
す側面図である。第５図にあられした巻取用コア１５は
、第４図のものとは両端近傍の形状が異なっている。FIG. 4 is a side view of one embodiment of the winding core according to the present invention. As shown in the figure, this winding core 12
Although it has a cylindrical shape (including a hollow or cylinder) as a whole as in the conventional case, it has a drum-shaped shape in which the outer diameter gradually decreases from the center 13 toward both ends 14 and 14'. Fifth
The figure is a side view of another embodiment of the winding core according to the present invention. The winding core 15 shown in FIG. 5 has a different shape near both ends from that shown in FIG. 4.

すなわち、両端近傍部１７．１７’が幅ｄの範囲内で同
径となっているのである。したがって、このコア１５は
、その中央１６がら両端１８．１８’の近傍１７．１７
’に向って外径が漸減した太鼓型の形状を有している。In other words, the portions 17 and 17' near both ends have the same diameter within the width d. Therefore, this core 15 has the following properties:
It has a drum-shaped shape with an outer diameter that gradually decreases toward '.

なお外径の最大部は上記実施例と異なり、中央１３．１
６の近傍部であってもよい。距１１１ｄの部分は、通常
、１００ｍ以下が望ましい。Note that the maximum part of the outer diameter is different from the above example, and is located at the center 13.1.
It may be in the vicinity of 6. The distance 111d is usually preferably 100 m or less.

この発明において、中央またはその近傍の最大外径をＡ
２両端またはその近傍の最小外径をＢ。In this invention, the maximum outer diameter at or near the center is A
2 The minimum outer diameter at or near both ends is B.

（（Ａ−Ｂ）　／Ａ）　ｘ　１００をＲとしたとき、Ｒ
が０．０５〜１゜０、好ましくは０．０５〜０．８とな
ることが必要である。前記式値Ｒカ月、０を越えると、
巻取用コアの両端近傍においてフィルムにたるみが生じ
、シワが発生しやすい。また、Ｒが０．０５未満になる
と、コアの使用頻度かたかくなるにっれて収縮や摩耗に
よる変形を生じ、中央またはその近傍が両端またはその
近傍より外径が小さくなる。このため、中央付近のフィ
ルム層間に空気が溜り易くなってシワが生じ易い。((A-B) /A) When R is x 100, R
It is necessary that the angle is 0.05 to 1°0, preferably 0.05 to 0.8. If the formula value exceeds 0 for R months,
The film tends to sag and wrinkles near both ends of the winding core. Furthermore, if R is less than 0.05, as the core is used more frequently, it will undergo deformation due to shrinkage and wear, and the outer diameter at or near the center will be smaller than at or near both ends. For this reason, air tends to accumulate between the film layers near the center, which tends to cause wrinkles.

この発明においては、フィルムの巻幅の範囲内において
、ロール形状に上記のごとき構成を持たすことが必要で
ある。このように構成することにより、フィルム巻巾が
広くてもフィルムと巻取ロール間に巻込まれる空気を巻
取中に容易に排出するようになる。そのため、巻取後の
巻取ロールからの経時的な空気抜けを少なくするように
なり、シワ発生を阻止できる。この作用は、特に発生頻
度の高い内層シワを防止するのに効果が大きい。In this invention, it is necessary that the roll shape has the above configuration within the range of the winding width of the film. With this configuration, even if the film winding width is wide, air caught between the film and the winding roll can be easily discharged during winding. Therefore, air leakage over time from the take-up roll after winding is reduced, and the occurrence of wrinkles can be prevented. This effect is particularly effective in preventing inner layer wrinkles, which occur frequently.

つまり、内層シワはフィルムの巻き始めに起き易いので
あるが、この発明にかかるフィルム巻取用コアは、コア
の中央またはその近傍の外径を両端またはその近傍にか
けて漸減させているので、内層シワの発生し易い巻き始
めでは、中央またはその近傍の外径と、両端またはその
近傍の外径の差が直接影響し、中央またはその近傍のフ
ィルムに対する接圧が両端またはその近傍より大きくな
り、中央またはその近傍において巻込み空気が排出され
易くなり、内層シワの発生が防止されるのである。その
後、巻径が太き（なるにつれて順次巻込み空気も少なく
なるので、シワ発生の懸念も少なくなり、これと共に、
巻取用コアの中央またはその近傍と両端またはその近傍
の接圧差も順次少なくなって、巻姿の良好な巻取りロー
ルが得られるのである。In other words, wrinkles in the inner layer tend to occur at the beginning of winding the film, but in the film winding core according to the present invention, the outer diameter at or near the center of the core gradually decreases toward both ends or near the ends. At the beginning of winding, where this is likely to occur, the difference between the outer diameter at or near the center and the outer diameter at or near both ends has a direct effect, and the contact pressure on the film at or near the center is greater than at or near both ends. Entrained air is easily discharged in or near the area, and the occurrence of inner layer wrinkles is prevented. After that, as the winding diameter becomes thicker (as it becomes larger, the amount of air involved will gradually decrease, so there will be less concern about wrinkles, and along with this,
The contact pressure difference between the center or the vicinity of the winding core and both ends or the vicinity thereof gradually decreases, and a winding roll with a good winding appearance can be obtained.

この発明において、フィルムとは熱可塑性合成樹脂から
なるフィルムをいい、特に延伸フィルムに利用すると効
果が顕著である。巻取用コアの材質としては、プラスチ
ック、金属９紙、木材などが用いられるが、摩耗、収縮
しないものであれば特に限定されない。通常プラスチッ
クが好ましく使用される。また、巻取用コアの長さとし
ては３００〜２０００ｍ程度、径は外径にして７０〜２
００削程度が採用される。In this invention, the film refers to a film made of thermoplastic synthetic resin, and the effect is particularly significant when used as a stretched film. The material for the winding core may be plastic, metal paper, wood, etc., but is not particularly limited as long as it does not wear out or shrink. Usually plastic is preferably used. In addition, the length of the winding core is about 300 to 2000 m, and the diameter is 70 to 2
Approximately 0.00 milling is used.

この発明のフィルム巻取用コアは、以上の構成を有する
ので、フィルム巻取中に内層部に巻込まれる空気を中央
近傍に溜めずに排出する。このため、フィルムを巻取っ
て得られる巻取りロールは、シワ発生がなくなり、巻姿
および品質のすぐれたものとなる。Since the film winding core of the present invention has the above-described configuration, air that is drawn into the inner layer portion during film winding is discharged without accumulating near the center. Therefore, the winding roll obtained by winding the film is free from wrinkles and has an excellent winding appearance and quality.

以下、実施例について説明する。Examples will be described below.

〔実施例〕〔Example〕

下記第１表にあられす条件のフィルム巻取用コアを用い
て厚み９．４μ１巻中５１０ｆｉのポリエステルフィル
ムを８０００ｍ巻取った。Using a film winding core under the conditions shown in Table 1 below, a polyester film having a thickness of 9.4 μm and 510 fi in one roll was wound up for 8000 m.

第　　１　　表 実施例１．２はいずれも巻取り中の巻込み空気が排出さ
れ、内層部を含めフィルムのシワは全く認められなかっ
た。また、得られた巻取りロールは、巻姿および品質共
にすぐれたものであった。In both Examples 1 and 2 of Table 1, air trapped during winding was discharged, and no wrinkles were observed in the film including the inner layer. Moreover, the obtained winding roll was excellent in both winding appearance and quality.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図および第２図は従来のフィルム巻取用コアをあら
れす側面図、第３図は従来のフィルム巻取用コアに接圧
ロールを当接させた状態をあられす側面図、第４図はこ
の発明にかかるフィルム巻取用コアの一実施例をあられ
す側面図、第５図はこの発明にかかるフィルム巻取用コ
アの他の実施例をあられす側面図である。 １２．１５・・・フィルム巻取用コア　１３．１６・・
・コア中央　１４．１４’、１８．１８’・・・両端１
７．１７’・・・両端近傍 代理人　弁理士　松　本　武　彦Figures 1 and 2 are side views of a conventional film winding core; Figure 3 is a side view of a conventional film winding core with a pressure roll in contact with it; The figure is a side view of one embodiment of the film winding core according to the present invention, and FIG. 5 is a side view of another embodiment of the film winding core according to the present invention. 12.15...Film winding core 13.16...
・Core center 14.14', 18.18'...Both ends 1
7.17'... Agents near both ends Patent attorney Takehiko Matsumoto

Claims (1)

【特許請求の範囲】[Claims] （１）　　中央またはその近傍から両端またはその近傍
に向かって外径を漸減させた太鼓型コアであって、中央
またはその近傍の最大外径をＡ１両端またはその近傍の
最小外径をＢ、　　（（Ａ−Ｂ）／Ａ）Ｘ１００をＲと
したとき、Ｒが０．０５から１．０であるフィルム巻取
用コア。(1) A drum-shaped core whose outer diameter gradually decreases from the center or its vicinity to both ends or its vicinity, where the maximum outer diameter at or near the center is A1, the minimum outer diameter at or near both ends is B, ( (A-B)/A) A core for film winding, where R is 0.05 to 1.0, where X100 is R.