JPH07196260A - Film winding core and photosensitive material supporter heat treated using said core - Google Patents

Abstract

PURPOSE:To provide a film winding core which dispenses with a spare film and a complicated controller, and is prevented from the occurrence of a closed winding, a winding wrinkle and winding accretion, and can be annealed as a bulkroll. CONSTITUTION:In a core which is used for film winding and annealing treatment in the manufacture of a high polymer film, the core having small gap openings 2 to continue extending the whole length in the longitudinal direction of a hollow core 1 is used, and it may be provided with various means for adjusting the small gap. In the case where both the edges of the film are knurled, continuous small gap openings are provided only near a part corresponding to both the edges in the longitudinal direction of the hollow core.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding core for manufacturing a plastic film. Particularly, the present invention relates to a winding core effective when the plastic film is made of polyester.

[0002]

2. Description of the Related Art In manufacturing a polymer film, a film wound on a winding core is called an annealing treatment with the passage of time or heating to remove internal strain inherent in the film when it is formed. Is performed. Since the film shrinks somewhat during the annealing treatment, it is in the form of a bulk roll, and the shrinkage force is concentrated on the core, which is the center of the roll, and at that time the film is tightly wound, winding wrinkles, winding beck, etc. There is a problem that uniform coating cannot be performed during the subsequent coating process. In order to deal with this problem, a method of manufacturing a magnetic recording medium in which a film having a coefficient of thermal expansion equal to or lower than that of a medium film is wound around a winding core, and a desired film is wound on the film and an annealing treatment is performed. (JP-A-4-24
No. 7321) or as an annealing treatment device by heating, when performing by dielectric heating, the distance between the film surface and the electrode to be treated to uniformly heat the roll to be fed out is kept constant as the winding diameter of the roll changes. Further, there is disclosed a heating device for a roll-shaped strip material (see Japanese Patent Publication No. 52-14451) for adjusting the winding speed of the roll on the winding side.

[0003]

However, the former case requires equipment, materials, and labor for winding an extra film having a low coefficient of thermal expansion to be wound around the winding core, and the latter case requires a complicated control device. There was a problem such as needing.

The present invention solves the above-mentioned problems of the prior art, does not require an extra film, does not use a complicated control device, and does not cause winding tightness, winding wrinkles, or winding bevels to form a bulk roll. (1) To provide a film winding core that can perform a large amount of annealing treatment.

[0005]

[Means and Actions for Solving the Problems] In a winding core used for film winding and annealing treatment in the production of a polymer film, it is desirable to have openings with small gaps continuous along the entire length in the length direction of the hollow winding core. Characteristic film winding core. The film winding core described above, further comprising means for adjusting the small gap. In the core used for film winding and annealing when the knurls are applied to both ears of the film in the production of the polymer film, only in the vicinity corresponding to the two ears in the longitudinal direction of the hollow core, A film winding core having continuous small gap openings. A photographic light-sensitive material, characterized in that, as the polymer film, one of polyethylene terephthalate and polyethylene naphthalate is used, and the film is heat-treated in a state of being wound around the winding core for winding according to any one of claims 1 to 3. Support. Achieved by

Examples of the material of the 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, polyamideimide. , Polyester imide, etc. The present invention, among these films,
It is particularly useful when using a polyester film such as polyethylene terephthalate or polyethylene naphthalate.

In the present invention, the continuous opening along the entire length in the lengthwise direction of the hollow core is a slit if it is linear,
Not necessarily a straight line. The shape of the opening may be curved or wavy as long as it is continuous over the entire length. The small gap of the opening is appropriately selected depending on the material of the winding core, but preferably 1
0 mm or less is preferable. In the present invention, the means for adjusting the small gap is capable of absorbing the shrinkage of the film to some extent by the small gap, but is a means of promoting it, and when the film is wound and when the film shrinks due to the annealing treatment, It is an auxiliary means that can handle small gaps according to the contracting force. For example, an elliptical shaft is provided between the small gaps (slits) so that the small gaps are contracted by the compressive force of the film, or an elastic rubber tube is provided in the hollow core, or the core is wound at the time of winding. It is possible to adopt a means such as putting an expanding chuck in a hollow core and winding it so as not to shrink the gap. In the present invention, when the film has knurls on both ears, it is sufficient to provide a continuous small gap only in the vicinity of the two ears of the winding core. Aluminum as the material of the hollow core,
Interleaving paper, wood, plastic, etc. are used, and the selection of the material is also determined by the core length, diameter, winding pressure and the like.

[0008]

Embodiments of the present invention will be described with reference to the drawings. Figure 1
1 shows, as one embodiment of the present invention, a hollow core 1 having a linear opening 2 with a small gap continuous along the entire length in the length direction.

FIG. 2 shows another embodiment of the present invention.
The hollow core 1 has an opening 2 with a small gap continuous along the entire length in the length direction, and as a means for adjusting the small gap, an elliptical shaft 3 is further provided in the opening 2, and the elliptical shaft 3 is wound up. The slit clearance is changed by rotating the film according to the shrinkage amount of the film.

In FIG. 3, as another embodiment of the present invention, a small gap opening 2 is formed continuously over the entire length of the hollow core 1 in the lengthwise direction, and means for adjusting the gap of the opening 2 is further provided. The hollow core 1 has an elastic tube 4 containing pressurized air and adjusts the air pressure according to the contraction pressure of the film web. Reference numeral 7 is a pressure adjusting plug of the elastic tube 4.

In FIG. 4, as another embodiment of the present invention, the expanding chuck 5 is enlarged as a means for adjusting the small gap so that the hollow core does not shrink due to the small gap when the film is wound. In the state shown in FIG.

FIG. 5 shows, as another embodiment of the present invention, a structure in which, when the film has knurls at both ears, the diameter of the winding core can be changed only in the vicinity thereof. .

Using the core shown in FIGS. 1 to 5 above, polyethylene naphthalate was wound as a support for a photographic light-sensitive material and annealed, but without tightening or wrinkling. Thus, it was possible to obtain a support having good flatness, which was suitable for uniform coating of the photosensitive material in the subsequent step. The same was true when a polyethylene terephthalate film was used as the support.

[0014]

According to the film winding core of the present invention,
Even if the bulk roll is subjected to the annealing treatment, the film core also shrinks due to the shrinkage of the film roll, so that a large amount of the annealing treatment can be performed without causing winding tightness, wrinkles, and winding beko. Further, as compared with the conventional technique, the work is simple and complicated control is not required, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a transverse sectional view (A) and a longitudinal sectional view (B) of an embodiment of a film winding core of the present invention.

FIG. 2 is a transverse sectional view (A) and a longitudinal sectional view (B) of another embodiment of the film winding core of the present invention.

FIG. 3 is a transverse sectional view (A) and a longitudinal sectional view (B) of another embodiment of the winding core for film winding according to the present invention.

FIG. 4 is a transverse sectional view (A) and a longitudinal sectional view (B) of another embodiment of the film winding core of the present invention.

FIG. 5 is a cross-sectional view (A) and a vertical cross-sectional view (B) of an embodiment of a winding core having knurls on both ears of the film of the present invention.

[Explanation of symbols]

 1 Hollow Core 2 Opening with a Small Gap 3 Elliptical Shaft 4 Elastic Tube 5 Expanding Chuck 6 Around the knurls of both ears 7 Plug

Claims (4)

[Claims] 1. A winding core used for film winding and annealing treatment in the production of a polymer film, characterized in that it has small gap openings continuous along the entire length in the length direction of the hollow winding core. Winding core 2. The film winding core according to claim 1, further comprising means for adjusting the small gap. 3. A core used for film winding and annealing treatment when knurling is applied to both ears of the film in the production of a polymer film, which corresponds to both ears in the lengthwise direction of the hollow core. A film winding core characterized by having continuous small gap openings only in the vicinity 4. A polyethylene terephthalate film or a polyethylene naphthalate film is used as the polymer film, and the polymer film is heat-treated while being wound on the winding core of any one of claims 1 to 3. And a support for a photographic light-sensitive material.