JPH0536446U - Roll-shaped photosensitive material core protection member - Google Patents

Abstract

(57) [Summary] [Structure] To prevent the deformation of the core, which is inserted into the hollow core of the photosensitive material roll, has an outer diameter corresponding to the inner diameter of the core, and is fixed by fitting with the core. In the protection member of
Achieved by a core-protecting member characterized by having a disk-shaped flat surface on the inner surface side, not the end surface side of the core, when the core is inserted, to maintain strength. [Effect] A core protection member for a roll-shaped photosensitive material, which does not deform or come off as a core protection member, is inexpensive, and has a high core protection capability, is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a deformation preventing member for a core of a photosensitive material wound in a roll.

[0002]

[Prior Art]

 In general, unexposed photographic paper and other roll-shaped photosensitive materials are packed in packaging materials called barrier bags in order to maintain photographic performance such as light-shielding and moisture-proof properties, and then packed in boxes such as corrugated boxes for distribution. Sent to the process. However, in the distribution process, when the product is accidentally dropped during manual transportation, or when the product collapses due to improper loading of the product on the pallet, etc. The product itself, for example, a color printing paper for general use, has a width of 120 mm, a length of 175 m and a weight of about 5 kg per roll, so the strength of the core itself is insufficient and the core is deformed. For example, if one roll is dropped from a height of 80 cm, the maximum acceleration of 70 to 80 G will be applied to the roll.

Further, such a roll-shaped printing paper is set in a roll state in a printer, an automatic developing machine, or the like. Therefore, if the winding core is deformed during setting, the setting may become impossible.

As a countermeasure against such a problem, a deformation protection member for the winding core has been devised.

FIG. 3 shows an example of a conventionally used protective member, and FIG. 3A is an external perspective view of the protective member 3 fitted to the photosensitive material roll S. 3B is a plan view of the protection member, and FIG. 3C is a side sectional view of the same. In the protective member, the inner cylindrical portion 32 and the outer cylindrical portion 34 are connected by the disc-shaped member 35 and the ribs 33, so that the protective member has strength against compressive deformation. The upper end of the end cylinder has a flange 31 that is larger than the inner diameter of the core, and the depth of pushing when inserting the core holder into the core with an automatic inserter or the like is regulated by the flange 31. Can also be applied.

FIG. 2 shows another example of a conventionally used protective member. 2A is a plan view and FIG. 2B is a side sectional view. In this case, it has a disk-shaped flat portion 22 without ribs, and in this case also has a brim 21.

FIG. 2C is a side sectional view when such a protective member 2 is fitted on the winding core 4. Even with the protective member 2 as described above, the roll-shaped photosensitive material is When a load over a certain level (compressive load over 350 Kgf) is applied, it may deform as shown in Fig. 2 (c) and the protective member 2 may come off before the load is sufficiently supported. This is because the protective member has a flat surface portion 22 on the end face side of the winding core that is strong against a load in the vertical direction, but the inside of the winding core is easily deformed. In this case, the protective member is removed before it is damaged, which means that the limit of material strength is not utilized.

In the case of FIG. 3, since the rib 33 connects the cylindrical members 32 and 34, the rib 33 is less deformed than the protective member of FIG. Is not enough.

Further, FIG. 4 is an example of another protective member, FIG. 4 (a) is a plan view, and FIG. 4 (b) is a side sectional view. In this case, a disc-shaped member 44 and an inner cylindrical portion 45 are provided at the center of the outer cylindrical portion 43 without a brim and are reinforced by ribs 46. In this case, it has the highest strength, and since the disc-shaped portion 44 is located at the center of the outer cylindrical portion 43, deformation in the direction of the end face of the winding core does not occur and it does not come out. However, since there is no brim 21, 31 as shown in Figs. Especially when inserting with an automatic machine, it is difficult to adjust the pushing depth. In addition, since there is no brim, there is a problem that the protective member enters the inside of the core and becomes slanted at that position, so that the deformation preventing effect is reduced and it is difficult to take out.

Further, the protective member as shown in FIGS. 3 and 4 requires a large amount of material, which is not preferable in terms of cost.

[0011]

[The purpose of the device]

 In order to solve the above problems, an object of the present invention is to provide a core protective member for a roll-shaped photosensitive material, which does not deform or pull out as a core protective member and has a high cost and a high core protective ability. To do.

[0012]

[Device configuration]

 The above object of the present invention is to prevent deformation of the core, which is inserted into the hollow core of the roll for a photosensitive material roll, has an outer diameter corresponding to the inner diameter of the core, and is fixed by fitting with the core. This is achieved by a core protection member characterized by having a disc-shaped flat surface on the inner surface side, not the end surface side of the core, to maintain strength when the protection member is inserted into the core.

Hereinafter, the present invention will be described in detail.

FIG. 1 shows an example of the protective member of the present invention. FIG. 1 (a) is a plan view, FIG. 1 (b) is a side sectional view, and FIG. 1 (c) is a side sectional view in which a protective member of the present invention is attached to a core wound with a photosensitive material.

As can be seen from FIG. 1, in the case of the present invention, unlike the conventional example, the disc-shaped member 12 in FIG. 1 is located on the center side of the winding core as compared with FIG. Since it is not on the outside like this, it has strength against the load from the outer circumference of the winding core, and is unlikely to deform so it does not come off.

Further, even if a considerable load is applied and the protective member is deformed, the protective member is bent toward the inner surface side so that it cannot be removed.

Of course, also in the case of the present invention, a structure as shown in FIG. 3 of the conventional example can be adopted. Also in this case, as in the case of FIG. 1, it is possible to reinforce on the center side of the winding core by the disk-shaped member and the rib and the inner cylindrical portion.

In FIG. 1, a collar 11 having a diameter larger than the inner diameter of the winding core is provided, and a protrusion 13 is provided on a part of the outer circumference. The outer diameter of the protrusion 13 is about 0.1 to 0.5 mm larger than the inner diameter of the core, and when the protective member is inserted inside the core made of cardboard, etc., this protrusion bites into the core and is fixed. To be done.

As the material of the protective member, it is preferable to use thermoplastic resin such as polystyrene, polyethylene, polypropylene and the like. Further, in the case of polystyrene, since impact resistance is required for the purpose of use of the present invention, it is preferable to blend general-purpose polystyrene with an appropriate amount of impact-resistant polystyrene or use impact-resistant polystyrene as 100%.

On the other hand, as the core around which the photosensitive material is wound, strength, moisture resistance, elasticity, surface shape and slipperiness with the innermost surface of the photosensitive material, how much the photosensitive material is pushed and absorbed by the cushion, and how much the cost is increased. Also, it is preferable to make a comprehensive determination from the standpoint of the effect on the photosensitive material.

Specifically, natural paper such as virgin pulp, waste paper, recycled paper, synthetic paper, plastic or a moisture-proof film, a metal foil, a metal vapor deposition film, or a laminate thereof, or a polyurethane foam on the surface thereof, A foamed polyethylene sheet, a foamed polyethylene paper, or the like laminated with cushioning properties can be appropriately adopted.

A method of mounting the protective member in the winding core may be performed manually, but a machine that automatically positions it by an optical sensor or the like while the conveyor is being conveyed and pushes the holder with a pusher such as a cylinder to automatically insert it. is there.

[0023]

EXAMPLES Hereinafter, the effects of the present invention will be illustrated by examples.

As the protective member body, a blend of 60% impact-resistant polystyrene and 40% general-purpose polystyrene is injection-molded into the shape shown in FIG. 1 and mounted on both end faces of the roll-shaped photosensitive material core. It was used. In this case, the photosensitive material used was a conventional roll-shaped roll with a 120 mm wide, 175 m long Conicolor PC paper type SR wound around a paper core with the emulsion side facing outward and a conventional protective member attached. The test was conducted under the comparison.

In the test, each roll equipped with a protective member was dropped from a height of 80 cm from the outer peripheral direction of the roll, and the mounted state of the protective member at that time was tested 10 times for deformation of the core.

As a result, in the product of the present invention, the core was not deformed and the core did not come out. On the other hand, in the conventional product shown in Fig. 2, the outer diameter was deformed by 1 to 4 cm, and some of them were missing.

As a result, according to the present invention, it is possible to suppress an increase in cost without requiring any measures for reinforcing the strength by using a material more than necessary.

[0028]

[Effect of the device]

 According to the present invention, it is possible to provide a core protective member for a roll-shaped photosensitive material, which does not deform or come out as a core protective member, is inexpensive, and has a high core protective ability.

[Brief description of drawings]

1A is a plan view of a protective member according to the present invention, FIG. 1B is a side sectional view of a protective member according to the present invention, and FIG. 1C is a side sectional view showing a mounting example of the protective member according to the present invention.

2A is a plan view of a conventional protection member, FIG. 2B is a side sectional view of a conventional protection member, and FIG. 2C is a side sectional view showing a mounting example of a conventional protection member.

FIG. 3A is a perspective view showing a mounting example of a conventional protection member. FIG. 3B is a plan view of the conventional protection member. FIG. 3C is a side sectional view of the conventional protection member.

FIG. 4A is a plan view of a conventional protection member. FIG. 4B is a side sectional view of the conventional protection member.

[Explanation of symbols]

 S Photosensitive material 1,2,3 Protective member 4 Core 11,21,31 Collar 12,22,35,44 Disc-shaped member 33,46 Rib

Claims (1)

[Scope of utility model registration request] 1. A protective member for preventing deformation of a core, which is inserted into the hollow core of a roll for a photosensitive material roll, has an outer diameter corresponding to the inner diameter of the core, and is fixed by fitting with the core. A core protecting member having a disk-shaped flat surface on the inner surface side, not the end surface side of the core, when inserted into the core to maintain strength.