JPH05100361A - Method for combining photosensitive strip and core - Google Patents

Abstract

PURPOSE:To combine a photosensitive strip and a core without leaving foreign matter such as an adhesive tape, an adhesive, etc., when the rolled strip is separated from the core and used. CONSTITUTION:A hot-melt adhesive 3 is applied on a core 2, and a photosensitive strip 1 and the core 2 are combined through the adhesive 3. When the strip 1 is separated from the core 2, the whole amt. of the adhesive 3 is substantially left on the core 2. Consequently, when the strip 1 is separated from the core 2, then exposed and developed, any trouble is not caused in the formation of pictures or in conveyance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting a photosensitive core material such as a photographic printing paper or photographic film wound in a roll with a winding core, and particularly to a photosensitive material material excellent in both productivity and usability. The present invention relates to a method of coupling with a winding core.

[0002]

2. Description of the Related Art Conventionally, as a method of winding a photosensitive strip around a core, a method of winding the photosensitive strip around the core through a coupling means such as an adhesive tape or welding by high frequency, or a method of winding without coupling However, it is widely used.
However, these methods have the following problems.

First of all, in the case of using a tape having an adhesive function only on one side in the joining means using an adhesive tape, the wound photosensitive strip is used in most cases, and when the tape is finally separated from the core. In addition, the tape remains on the side of the photosensitive strip, and the tape is wound around the roller of the device used in the exposure and development processing steps, which causes an obstacle to the transport of the photosensitive strip. Also, when using a tape with adhesive function on both sides, even if the adhesive tape remains on the core, a small amount of adhesive remains on the photosensitive strip, which in the worst case may lead to defective conveyance of the photosensitive strip. There is. Further, in the equipment for winding the photosensitive strip around the core, it is difficult to automate the attachment, which hinders the automation of the production process.

Secondly, in the method of welding by utilizing high frequency, the use conditions are limited, for example, it is necessary to provide a thermoplastic resin layer on the outer peripheral surface of the winding core or the surface of the photosensitive strip that contacts the winding core. There was a problem of being done. In addition, when the photosensitive strip is separated from the winding core, the winding surface or the welded surface of the photosensitive strip is often broken and separated. In this case, the resistance of the separation is increased, and the device using the photosensitive strip is increased. In some cases, due to the low torque of the driven transport roller, the photosensitive strip material and the core cannot be separated from each other, which may result in poor transport.

Thirdly, in the method of winding the photosensitive strip material and the winding core without connecting them, in the automatic exposure machine using the wound photosensitive strip material, the photosensitive strip material is conveyed only in the rewinding direction. If it is necessary to convey the material in the winding direction in the reverse direction, the photosensitive strip will be separated earlier than the core while the photosensitive strip remains on the core several times, and it will not be possible to perform reverse conveyance. There was something.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above problems, and when a photosensitive strip wound in a roll is separated from the core in the process of use, an adhesive tape is applied to the photosensitive strip. PROBLEM TO BE SOLVED: To provide a method for joining a photosensitive strip and a core that does not adversely affect the conveyance of the photosensitive strip or image formation in the exposure and development processing steps, etc. without leaving foreign matter such as adhesive. With the goal.

[0007]

The present invention has been made in order to achieve the above-mentioned object, and a hot-melt type adhesive is applied in a thin film on a winding core, and then the photosensitive material is sensitized through the hot-melt type adhesive. When the photosensitive material is separated from the winding core in the process of use by joining the strip material and the winding core, substantially the entire amount of the hot melt adhesive remains on the winding core.

The hot melt type adhesive is not particularly limited, and examples thereof include rubber type, vinyl copolymer type and olefin type adhesives. Among them, vinyl copolymer type adhesives having low viscosity when melted are coatable. Excellent and preferable.

The application form of the hot melt adhesive is not particularly limited, and may be linear, dot, spiral, film or the like. Among them, the method of applying spiral or film is hot. It is preferable because the melt type adhesive can be easily formed into a thin film so that the unevenness can be reduced and the adhesion area can be widened. Further, if the hot melt adhesive is applied along the outer peripheral direction of the winding core, there is no need to position the tip of the photosensitive strip and the outer peripheral surface of the winding core, which is advantageous for automation of winding and is more preferable.

[0010]

EXAMPLE An example of the method for connecting the photosensitive strip and the core of the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view showing a state in which the photosensitive strip 1 and the core 2 of the present invention are combined. FIG. 2 is a side view of the same. FIG. 3 is a perspective view showing a state in which a hot melt adhesive 3 as a connecting means in the method for connecting the photosensitive strip material and the winding core of the present invention is applied to the winding core 2, and FIGS. It is a perspective view showing the state where it applied in a mode.

In FIGS. 1, 2 and 3, the hot melt adhesive 3 is spirally applied in a thin film on the outer peripheral surface of the winding core 2. The film thickness of the hot melt adhesive is 50
To 100 μm is preferable. The hot melt adhesive is a vinyl copolymer system and has a viscosity of 1 at a use temperature of 180 ° C.
000 cps was used.

A roll-shaped photosensitive strip material using the embodiment of the present invention in which the photosensitive strip material and the winding core are bonded to each other via a hot-melt type adhesive applied on a spiral, and FIGS. When a roll-shaped photosensitive strip material using the conventional bonding method shown in Fig. 7 is used, when the core and the photosensitive strip material are separated from each other, in the example of Fig. 7 using the single-sided adhesive tape, the adhesive tape is Figure 8 using double-sided adhesive tape remaining on the photosensitive strip
In the above example, the adhesive of the double-sided pressure-sensitive adhesive tape remained on the photosensitive strip even though it was in a small amount.

Further, in the example of FIG. 9 using high frequency welding, the welded surface of the core or the photosensitive strip is broken and separated. On the other hand, in the examples of the present invention, no foreign matter remained on the photosensitive strip side. The maximum peel resistance between the photosensitive strip and the core of the example of FIG. 1 was about 1000 g.

[0015]

According to the present invention, the photosensitive strip material and the winding core can be easily combined, and the photosensitive strip material is easily separated from the winding core at the end of use of the photosensitive strip material. Since no foreign matter remains, no trouble is caused by the foreign matter in the exposure and development processing steps.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment using the method for joining a photosensitive strip and a core of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a perspective view showing a state in which a hot-melt type adhesive which is a coupling means of the above embodiment is applied to the core.

[Figure 4]

[Figure 5]

FIG. 6 is a perspective view showing a state in which a hot-melt type adhesive of a joining means in another embodiment using the method for joining the photosensitive strip and the core of the present invention is applied.

FIG. 7A is a perspective view of a conventional method (single-sided adhesive tape) for joining a photosensitive strip material and a winding core. (B) The same side view.

FIG. 8 (A) is a perspective view of a conventional method (double-sided adhesive tape) for joining a photosensitive strip and a core. (B) The same side view.

FIG. 9A is a perspective view of a conventional method of joining a photosensitive strip and a core (high-frequency welding). (B) A state diagram immediately after the core 2 and the photosensitive strip 1 are separated from each other in FIG. 9 (A).

[Explanation of symbols]

 1 Photosensitive strip 2 Core 3 Hot melt adhesive 4 Single-sided adhesive tape 5 Double-sided adhesive tape 6 Welded part 7 Surface after the welded part is separated

Claims (1)

[Claims] 1. A photosensitive strip material and a winding core, characterized in that, when the photosensitive strip material is wound around a winding core, the winding core and the photosensitive strip material are bonded to each other via a hot-melt adhesive. How to join.