JPS60112562A - Winding method of web - Google Patents

Abstract

PURPOSE:To wind a web reliably with high speed without causing deformation by winding the web with low tension approximately 70% of basic tension during initial winding stage. CONSTITUTION:During initial winding stage, the web is wound with low tension lower than 70% of basic tension thereafter wound with recovered tension. Consequently, frictional force to be applied between the webs is reduced during initial winding stage to release tightness between the webs thus to make them slidable and to absorb the distorsion of web gradually. As a result, such web as that for photographic film which is subjected to bad influence onto the characteristic through contact can be wound reliably with high speed without causing deformation such as rumples.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention 8A is used for winding relatively wide webs whose properties are adversely affected by contact, such as photographic film webs, at high speed. This relates to a winding force method for IC webs.

[Prior art]

Generally, as a method for winding a relatively wide web having a total width of 1WL or more at high speed, a surface roll winding method or a touch roll winding method is used. However, in all of these methods, the entire second side of the web is pressed by a roll, so if the web is a photographic film with a photosensitive agent layer on its surface, the pressure caused by the pressure of the rolls may Failures such as fog, pusher failure such as desensitization phenomenon, or static failure due to generation of static electricity occur (7) cannot be applied. Therefore, in order to achieve high-speed winding of such a web, It is necessary to use all methods of winding the web while applying high tension to it.

However, this high-tension winding method has the problem that high tension acts on the web, causing deformations such as tsuns and wrinkles in the web, resulting in 1'f' tangles. In other words, in the early stage of web winding, it is difficult to set the third spinner in a completely accurate position with respect to the web winding core, resulting in distortion due to misalignment. As the disease progresses, it gradually accumulates and becomes noticeable,
The road causes localized deformations such as burrs. Furthermore, this local deformation spreads to the subsequent web, causing a fairly wide range of deformation such as wrinkles, resulting in a significant deterioration in the quality of the web.

[Purpose of the invention]

An object of the present invention is to provide a web winding method that can reliably wind up a web at high speed without causing deformation noises such as ``CC'' special effects such as ``cross-cut'', ``cross-cut'', and ``horn wrinkle'' due to contact. I'm going to do it.

[Structure of the invention]

The features of this invention are the wide weso'fr,
8.1. The method for winding a web at cylinder speed is to wind the web at a low winding tension of 70% or less of the basic winding tension during the initial period of web winding, and then to restore the winding tension. Place it at the point where it will be rolled up.

Here, the basic winding tension refers to the Chi-Se tension winding method, which is commonly used as a web winding method using high tension.
As shown in Figure 1, the winding tension gradually increases linearly as the diameter of the roll formed by the wound web (hereinafter referred to as the "web roll diameter") increases. Refers to the tension at the start of one winding (indicated by the symbol r'r'IJ in the figure) in the method of lowering. In addition, the winding tension T to be applied to the web in the Chi-Zo tension winding method [X is hereinafter referred to as "Chi A winding tension".

[Embodiments of the invention]

As shown in FIG. 2, one embodiment of the present invention 1cj61 performs the entire winding process of the gold gauze web, which is roughly divided into the following three steps (11 to (3)).This winding method has a width of 1.00
It is suitably applied when winding a relatively large web of 0 run or more at a high speed of 30 m/min or more.

(1) After the start of winding of the first stage web, the initial winding period P1 reaches its maximum at the time f when the number of turns of the web wound around the core becomes 1/10 of the number of turns at the end of winding. rtc, the web winding tension is 70% or less of the total basic winding tension T1.

Preferably, the tension is set at a low tension corresponding to 20-70%.

The specific period of setting the tension at such a low tension and the magnitude of the tension at that time will vary depending on the friction coefficient, thickness, width, rigidity, and winding speed of the web, and will be within the range of the above values. ? The optimum value is determined experimentally.

(2) In the second stage, after the winding period P1 with low tension in the first stage has elapsed, the winding tension should be restored to T2, which corresponds to the web roll diameter at the end of the first stage P2. .

(3) Third stage During the period P5 from the end of the second stage to the end of web winding, the entire web winding is continued using a commonly used high speed winding method. As the high-speed winding method, there are various methods such as Qi-ξ tension winding method, constant tension winding method, constant torque winding method, etc., so it can be selected as appropriate depending on the wA of the web, etc. A tension winding method is preferred. Qi, z in the tension winding method
The winding tension is set so that the ratio of the winding tension at the end of winding to the winding tension at the beginning of the third (6) stage by X′1″f decreases by about 50 to 70%. I like it.

How to wind up a web with the above-mentioned defects? In the first stage, the distortion caused in the web is first corrected, and then the second stage is carried out.

By performing full-scale winding with tension in the first stage IC, deformation such as one wrinkle in the horn may occur.TI
Therefore, stable web high-speed winding can be achieved.

That is, the first stage IC% temperature is set to a low tension corresponding to 70% or less of the total basic web winding tension.

(1) Temperature between the webs during web winding '1'x included 1
(2) Furthermore, the drag force acting on the web is proportional to the winding tension. Since then, its value has decreased.

Therefore, the frictional force (yt between the friction coefficient and the drag force) acting between the webs becomes smaller. As a result, the adhesion between the webs being wound is relaxed, allowing them to slide or jam against each other, and distortion of the web caused, for example, by incorrect setting on the winding core, can cause subsequent glue nibs to It is believed that minute shifts in the surface of the fabric will be gradually absorbed, leading to deformations such as wrinkles and wrinkles.

In this way, the distortion of the web at the initial stage of winding is corrected in the first stage, and furthermore, in the second and third stages after the web roll diameter has been adjusted to a certain size, the distortion of the web is corrected. Using a basic tension winding method or the like, the web can be wound stably and at high speed using a basic tension or a high tension similar to this.

[Experiment example]

Experimental method: As shown in FIG. 3, the web was wound at high speed by varying the winding tension in various ways as the number of turns increased, and the conditions for each were fully examined.

The web used in the experiment was 2,100 fins wide and 120μ thick.
m.

It is coated with a polyethylene terephthalate V-) film with a length of 1,800 m. Further, the diameter of the winding core is 250 mm, and the winding speed of the ry knee j is 60 m/min. These conditions are common to all experiments at 8°C.

Each experimental example will be described below.

Experimental Example 1 In this experimental example, one embodiment of the present invention was not used, and as shown in the diagram (I) in FIG. and a small shi.

Hereafter, the entire web winding was performed using the Qi/e winding tension. As a result, it was possible to wind the web neatly without any deformation such as web twisting. 8. The following table shows the number of windings and the winding tension of the reference madenori.

Experimental Example 2 This experimental example constitutes a form 511 which is outside the scope of the present invention, and was carried out using taper winding tension throughout the entire winding process as shown in the diagram ([) in Fig. 3. . The fruit of that encouragement,
Wrinkles were observed within a range where the number of turns of the web did not reach 50 turns. 8. Specific values for the number of turns of the web and the winding tension are as shown in the following table.

Experimental Example 3 Similar to Experimental Example 2, this experimental example also has no aspect of Vc which is outside the scope of the present invention. It will fail if the winding tension is approximately 40% of the winding tension. As a result, the web was wound into a bamboo shoot shape, and it became impossible to wind it halfway. The following table lists all the specific values for the number of turns of the web and the winding tension.

〔Effect of the invention〕

As described above, the present invention reliably prevents the web from being adversely affected by contact such as photographic film webs, causing wrinkles, wrinkles, and deformation sounds. Moreover, it is possible to provide a method for winding a web that can be wound at high speed.

[Brief explanation of drawings]

Fig. 1 is a 'f diagram showing the relationship between the web roll diameter and the winding tension in Qi/ξ tension winding, and Fig. 2 is a diagram showing an example of the present invention. Figure 3 is a diagram showing the relationship between web roll diameter and winding tension. It is a diagram showing the entire relationship between the number of turns and the winding tension of the i-moxibustion VCS gel web.

Claims (1)

[Claims] 1) In a web winding method for winding a wide web at high speed, the initial period of web winding is at 7 of the basic winding tension.
A method for winding Kuep, which is characterized in that it is wound with a low winding tension of 0% or less, and then the winding tension is fully restored before winding. 2) During the initial period of web winding with a low winding tension of 70% or less of the basic winding tension, the number of turns of the web wound around one core becomes 1/10 of the number of turns at the end of winding. A web winding force method according to claim 1, which extends to the fullest extent.