JPH08244035A - Taking-up, annealing treatment and unwinding of strip like polymeric film and support for photosensitive material - Google Patents

Abstract

PURPOSE: To provide a taking-up, annealing and unwinding methods reducing the dent trouble on a winding core side by a conventional flaw, the reflection of a cut end, the reflection of the winding core arid the depressed dent trouble on an outer periphery side and reducing the generation of the taking-up planar trouble (winding shift, seaming wrinkles, winding core part wrinkles) in a cooling process after annealing treatment and a support for a photosensitive material by those methods. CONSTITUTION: When a film roll of a strip like polyethylene terephthalate film with a thickness of about 100μm, a width of 1500mm and a taking-up diameter of 700mm is subjected to annealing treatment, a knurling thickness on a winding core side is set to web thickness X (10-50)% and the knurling layer of an outer peripheral part is gradually reduced so as to become web thickness X (1-20)% to perform the taking-up annealing treatment of a web. Unwinding for a process after knurling is executed in such a state that the web is cooled in the range of temp., (glass tranmition temp.) -20 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for winding a belt-shaped polymer film, an annealing treatment method, a rewinding method, and a support for a photographic light-sensitive material according to the above method.

[0002]

2. Description of the Related Art A polymer film, particularly a polyester film, is subjected to a heat treatment in order to release the residual strain received in its manufacturing process, which is called an annealing treatment. This annealing treatment has been carried out by storing the film roll in a high temperature thermostatic chamber for a certain period of time or by passing it through a continuous furnace at a low speed. In this step, it is inevitable that the strip-shaped polymer film is unevenly heated on the winding core side and the outer peripheral side and is subjected to uneven load. Also, after the annealing treatment, the entire band-shaped polymer film is cooled to room temperature (around 25 ° C),
It was rewound for the next step. On the other hand, in order to prevent winding deviation of the strip-shaped polymer film, a so-called "thickening process" in which unevenness is formed on both edges of the strip-shaped polymer film conventionally formed, knurling is performed. It also plays an important role in processing,
For uniform heating of the band-shaped polymer film and uniform load,
It is indispensable.

As a conventional technique for thickening processing, that is, knurling, as a typical method, a "winding method for a synthetic resin film" is used, in which a part of the film surface in the width direction is subjected to anti-slip treatment. , A method for winding a synthetic resin film characterized by winding, specifically, a method by corona discharge treatment (Japanese Patent Publication No. Sho 50).
-36459 gazette). The "thickening device" is a thickening device that mechanically deforms the edge portion of a molded thermoplastic sheet material to make unevenness, specifically, a roller pair in which the mechanical deformation means has an uneven surface. At least one of the roller pair having the uneven surface is arranged so that the uneven surface has striped voids in the width direction of the roller peripheral surface. A thickening processing device configured to leave a void in a processed portion (see Japanese Patent Publication No. 57-36129). As a "plastic film winding device", a plastic film winding device is provided which faces both ears of the plastic film and is provided with a heating device for locally blowing hot air to form irregularities on the surface of the film ( Actual Kaihei 1
No. 109045) is disclosed.

[0004]

However, in the prior art, a thorough countermeasure against uneven heating and uneven load of one film roll as a whole is insufficient, and the disclosed technique related to knurling is insufficient. However, there is no countermeasure against the winding core side and the surface layer side in relation to the winding core at the time of annealing treatment, and the rewinding of the strip-shaped polymer film after the annealing treatment is not described. Also, the effect was insufficient. As a result, there were defects in the core after the annealing process, cut edges, cut-in marks on the core and recesses on the surface layer, and winding misalignment, winding wrinkles, and core wrinkles during rewinding after the annealing process. .

An object of the present invention is to reduce winding defects of a strip-shaped polymer film by reducing defects such as spot defects, cut edges, core defects and recessed bevel defects in the outer peripheral portion due to conventional defects. Winding surface failure in the cooling process (winding misalignment, winding wrinkles, winding core wrinkles)
It is an object of the present invention to provide a winding method, an annealing treatment method, and a photographic light-sensitive material support by the above method, which reduce the occurrence of

[0006]

Means and Actions for Solving the Problems The above object of the present invention is to provide a method for winding a strip-shaped polymer film, in which the thickness of the knurling to be thickened at both edges in the width direction of the web is adjusted to the core side. The tape-shaped polymer film winding method is characterized in that the tape-shaped polymer film is wound by gradually decreasing it from the surface layer to the surface layer side. In the method for annealing a strip-shaped polymer film, the thickness of the knurling at both edges in the width direction of the web is according to claim 1, and the annealing treatment method for a strip-shaped polymer film roll. A method for rewinding a strip-shaped polymer roll film, which comprises performing rewinding for the next step after the annealing treatment of the strip-shaped polymer film roll in a state where the web is still at a high temperature. The band-shaped polymer film is polyethylene terephthalate or polyethylene naphthalate, and the method for winding the band-shaped polymer film, the annealing treatment method, and the rewinding for the next step are performed by the method according to claim 1, 2, or 3. A support for a photographic light-sensitive material, characterized in that Achieved by

Examples of the material for the strip-shaped polymer film used in the present invention include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyethylene, polystyrene, polyvinyl alcohol, vinyl chloride, Teflon, vinylidene chloride, nylon, polypropylene, polycarbonate, polyimide and polyamide. Examples include imide and polyester imide. The present invention is particularly useful when a polyester film such as polyethylene terephthalate or polyethylene naphthalate is used as a photographic light-sensitive material support among these films.

In the present invention, the thickness of the knurling, which is thickened at both edges in the width direction of the web, is gradually reduced from the core side to the outer peripheral side to wind the knurling. Thick x (10 to 50%) thicker, which keeps the web floating and lowers the surface pressure, which causes uneven heat transfer and foreign matter adhered to the core.
Prevents cut edges and core reflections, and the outer peripheral side is web thickness x (1
˜20%) to make the knurling thinner than the core to reduce the air film thickness interposed between the web layers, thereby preventing a recessed bevel failure over time, that is, the knurling thickness on the core side, for example. Knurling thickness x web thickness
If it is 30%, the knurling thickness on the outer peripheral side is the web thickness ×
It means to gradually reduce it to 5%. The optimum thickness ratio depends on the film material, thickness, and winding length. The knurling can be gradually reduced by adjusting the voltage in the case of corona discharge, by adjusting the uneven surface and the pressing force in the case of mechanical discharge, and by adjusting the hot air temperature in the case of blowing hot air. In the present invention, the unwinding for the next step after the annealing treatment is carried out in a state where the web is still at a high temperature, preferably by carrying out in a state where the glass transition temperature of the polymer film is within -20 ° C. Winding displacement due to shrinkage in the cooling process,
Wrinkles and winding core wrinkles can be reduced. This is because cooling is performed at the time of rewinding without performing cooling in a roll state, so that shrinkage strain due to temperature decrease is prevented from being applied to the roll state. Here, the next step is a working step such as applying or cutting the undercoat liquid.

[0009]

EXAMPLES The present invention will be specifically described below with reference to examples. (Example-1) A strip-shaped polyethylene terephthalate film having a thickness of 100 µm, a width of 1500 mm and a winding diameter of 700.
When annealing a film roll of mm, the core side knurling thickness is set to the web thickness x 30%, and the outer peripheral side knurling layer is gradually reduced so that the web thickness x 5%, and the web is wound and annealed. Then, the trouble of the core and the reflection of the cut were suppressed to five laps at the winding circumference, and the occurrence of the recessed bevel failure at the outer circumference was eliminated.

(Comparative Example-1) If a web having the same knurling thickness as the web thickness x 20% and a constant web length direction is used for the same strip-shaped polymer film as in Example-1, the failure of the winding core portion is 100 laps. The outer peripheral failure occurred up to 150 laps.

Example 2 A film roll having a width of 1500 mm and a winding diameter of 700 mm of a strip-shaped polyethylene terephthalate film was heat-treated at the glass transition temperature of the web, and then the web temperature was within the glass transition temperature of -20 ° C. By performing the unwinding for the next step, the winding misalignment and the winding wrinkle due to the heat shrinkage of the web did not occur.

(Comparative Example-2) When a strip-shaped polymer film similar to that of Example-2 was rewound after being cooled to a room temperature (25 ° C), winding wrinkles were generated inside the film roll, and during rewinding. Volume deviation occurs. Further, the dimensional change of the core material occurs in the core portion, slip occurs between the core and the product roll, and rewinding is impossible.

[0013]

EFFECTS OF THE INVENTION By adjusting the knurling thicknesses on the core side and the outer peripheral side according to the present invention, it is possible to reduce the troubles on the core side such as cuts and cuts, and the appearance of the core surface to zero. Could be prevented. Also, by starting the unwinding for the post-annealing step of the invention at elevated temperature,
It was possible to eliminate winding misalignment and winding wrinkles due to heat shrinkage during the web cooling process.

Claims (4)

[Claims] 1. A method for winding a strip-shaped polymer film, characterized in that the thickness of a knurl that is thickened at both edges in the width direction of the web is gradually reduced from the core side to the outer peripheral side. A method for winding a strip-shaped polymer film. 2. The method for annealing a strip-shaped polymer film according to claim 1, wherein the knurling thickness at both edges of the web in the width direction is according to claim 1. 3. A method for rewinding a belt-shaped polymer film roll, wherein the rewinding for the next step after the annealing treatment of the belt-shaped polymer film roll is carried out in a state where the web is still at a high temperature. 4. The belt-shaped polymer film is polyethylene terephthalate or polyethylene naphthalate,
The method of winding the strip-shaped polymer film, the method of annealing treatment, and the rewinding for the next step are performed by the method of claim 1, 2, or 3.
A support for a photographic light-sensitive material, which is produced by the method described in 1.