JPS6113585B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a peeling device for a peelable flexible film adhered to the surface of a support, and in particular a photosensitive material whose adhesion to the support changes upon exposure to light. The present invention relates to a release developing device for a photosensitive lithographic printing material having a layer of a photosensitive composition and capable of forming a printed image by peeling.

In recent years, research into the production of lithographic printing plates has become more active, and the performance of the manufactured lithographic printing plates has improved significantly.In particular, the remarkable improvement in printing durability of printing plates has forced the replacement of letterpress plates with lithographic plates. ing. The reason for this situation is that recent lithographic printing plates have improved printing durability, making it possible to print in large quantities, are easy and convenient to use, and also require very short platemaking time and stable development. This is because it has a variety of features, such as excellent durability and reproducibility of plates, and can withstand long-term storage as a plate material.

Various types of lithographic printing plate materials have been known in the past, but one that particularly has the above-mentioned features is a material that uses a photopolymer as a photosensitive layer.

Among such materials, among others, Special Publication No. 38-9663,
Special Publication No. 43-22901, Japanese Patent Publication No. 7728, Japanese Patent Publication No. 47-7728, Japanese Patent Publication No.
The methods described in each publication of No. 50-46315 utilize the photopolymerizability of photopolymers and the change in adhesive properties caused by the photopolymerization, and according to this method, it is generally possible to support plastic films, metals, paper, etc. A layer of a photopolymerizable composition containing a polymer as a binder, an unsaturated monomer, and a photopolymerization initiator as main components is provided on the body, and a thin transparent film is further layered on top to form a cover. The plate-making method using this is to expose the cover to light using an original, and then peel off the cover to transfer either the exposed or unexposed areas of the photosensitive layer onto the support or the other. One is left on the cover, and negative and positive (or positive and negative, respectively) images are formed on the support and the cover, respectively.

Such photosensitive lithographic printing plate materials generally include a hydrophilic support, an intermediate layer made of a hydrophilic polymer compound or the like provided thereon in some cases, a layer of a photosensitive composition, and a release cover film. It consists of The main components of these components will be briefly explained. Hydrophilic supports include pure aluminum plates, aluminum alloy plates containing copper, zinc, iron, magnesium, etc. as components, zinc plates, chrome plates, chromium, aluminum and zinc on copper or iron. A three-layer plate with copper laminated on top of zinc or iron, and chromium or aluminum on top of that, or aluminum, chromium and zinc on plastic such as polyethylene terephthalate or polymethyl methacrylate. There are boards made by laminating any of these materials, paper, cellulose ester boards whose surfaces are made hydrophilic by hydrolysis, and plastic boards such as polyethylene terephthalate boards whose surfaces are made hydrophilic by matting with starch or silicon dioxide fine particles.

In addition, the photosensitive composition contains an organic polymer compound as a binder and an addition polymerizable unsaturated bond.
This is a composition containing a photopolymerization (or photocrosslinking) initiator and a photopolymerization (or photocrosslinking) initiator. Japanese Patent Application Publication 1973-
No. 123021, Japanese Patent Application Laid-Open No. 1973-46315, and Patent Application No. 1977-
The photosensitive composition disclosed in No. 111171 can also be preferably used in the present invention.

Further, as a cover film for peeling, it is necessary to have good light transmittance and a uniform surface. Specifically, various kinds of polyethylene terephthalate, polypropylene, polyethylene, cellulose triacetate, cellulose diacetate, polyvinyl chloride, polyvinyl alcohol, polystyrene, cellophane, polyvinylidene chloride copolymer, polytetrafluoroethylene, polytrifluoroethylene, etc. Plastic film can be used.
Furthermore, a composite material consisting of two or more of these types can also be used.

The cover film is generally 1 to 100 μm.
A thickness in the range from 20 to 40 μm is preferably used.

The thickness of the layer of the photosensitive composition is set such that the printing image area finally formed performs the desired function, but generally, the thickness of the layer of the photosensitive composition after the solvent is removed is The layer thickness of the photosensitive composition is from 0.5 to 100μ
m, more preferably 0.5 to 20μ
m range.

The material used in the present invention is a material for producing a lithographic printing plate, but it goes without saying that it is also suitable for use as a material for image reproduction using the image itself obtained by processing the material. Nor.

Next, a typical structure of this photosensitive planographic printing plate material will be explained with reference to FIG. In the figure, 10 is a photosensitive lithographic printing plate material, which includes a cover film 11, a photosensitive composition layer 12 and a support 13.
It is composed of. When the cover film 11 is exposed imagewise through the cover film 11 and then the cover film 11 is peeled off from the support 13 by suitable means as shown on the left side of the figure, the intermediate photosensitive composition layer 12 is formed, for example, in the exposed area 12'. The unexposed region 12'', which remains on the support 13 side, remains on the cover film 11 side.

Now, in order to create a lithographic printing plate from a photosensitive lithographic printing plate material having such a structure, the layer of the photosensitive composition is first image-exposed through the cover film as described above, and then the cover film is peeled off from the support. It can be developed by doing this.

A peeling and developing method and an apparatus therefor in such an image copying method are described in Japanese Patent Laid-Open No. 58909/1983. This device uses a continuous adhesive tape that is successively pressed and pulled away from the end of a flexible film layer for peeling off an image copying material that has been imagewise exposed and heated on a layer of a photosensitive composition. A continuous adhesive tape and a flexible film layer are integrated and the flexible film layer is peeled off from a support.
The disadvantage of this device is that adhesive tape with a width larger than the width of the copying material is continuously used over a length longer than the length of the copying material, which not only makes it uneconomical but also wastes the tape. The processing also requires a great deal of effort.

SUMMARY OF THE INVENTION An object of the present invention is to provide a peeling developing device for the above-described image copying method which eliminates the above-mentioned drawbacks, and also to easily peel off a peelable flexible film adhered to a support. The purpose is to provide equipment.

The present invention includes a peeling roller having an elastic surface, and a nip rotating in contact with the peeling roller.
It has a roller and a member that can press the laminate to be brought into contact with the peeling roller, and the peeling roller rotates the tip of the film-like material on the laminate to be conveyed in a direction opposite to the conveying direction. The film-like material is peeled off by contacting with the film-like material while the film-like material is being peeled off, and then the film-like material is continuously peeled off while the film-like material that has been peeled off is pinched by the rotation of the peeling roller and the nip roller. It is a peeling device.

Next, the present invention will be explained with reference to the drawings of one embodiment. FIG. 2 is a cross-sectional view for explaining the configuration of an embodiment of the apparatus according to the present invention, and FIGS. 3 to 5 are cross-sectional views of the above-mentioned apparatus for explaining the function of peeling off a film-like object. be. In these figures, the size and shape of each member are schematically drawn to explain the principle of the present invention, so the device according to the present invention is not limited to these sizes and shapes, and furthermore, It goes without saying that the present invention is not limited only to the examples. In FIG. 2, reference numeral 20 denotes a peeling part, and 21 denotes a support member on which a laminate having a film-like material to be peeled is placed, and also serves as a guide for inserting the above-mentioned laminate into the peeling part 20. Reference numeral 22 denotes a support member for the peeled laminate of the film-like material, and it is preferable that the surface of the peeled laminate be treated with a slippery substance such as Teflon so as not to damage the surface of the peeled laminate. These supporting members are preferably fixed at fixed positions with respect to the peeling part 20 by members not shown, but the device according to the invention can be realized without these members. Reference numeral 23 is a pressure contact member which has the function of not displacing the laminate upward when it passes under it.
Therefore, it is only necessary to be fixed when the laminate passes through, or it may be possible to move up and down. The pressing member 23 does not need to be plate-shaped, and may be a roller-shaped member, for example, as long as it has the above-mentioned function. A sensor 24 detects a laminate having a film-like material, and a signal from this sensor starts the peeling section 20, and a sensor 25 similarly detects the passage of the laminate from which the film-like material has been peeled off. The operation of the peeling section 20 may be terminated based on the detected signal. As these sensors, any known sensors such as photoelectric ones and mechanical ones can be used, and provision of these sensors is a preferred embodiment of the present invention. Numerals 26 and 27 are nip rollers, which nip the film-like material between them and the peeling roller 28 and rotate together with the peeling roller 28.

FIG. 3 shows a state in which the lithographic printing plate material 10 having the structure shown in FIG. 1, for example, is inserted into the peeling section 20 as a laminate having a film-like material. In the figure, the lithographic printing plate material 10 is inserted into the peeling section 20 with the cover film 11 facing downward in the direction of the arrow 29 by a suitable conveying member or by hand. At this time, peeling roller 2
8 is arranged so as to be in contact with the lithographic printing plate material 10, and the surface thereof is shown to move in the direction opposite to the traveling direction of the lithographic printing plate material 10 (in the direction of arrow 30 in the figure) at the contact position. It is driven and rotated by a drive device that is not connected to the engine. The rotation of the peeling roller 28 may be started by a switch (not shown) or by a sensor 24.
It may be started by a detection signal from. Also,
Generally, the conveyance speed of the laminate to be peeled is low at first, but the rotational speed of the peeling roller 28 is set high, and the tip of the film-like material to be peeled is peeled off between the peeling roller 28 and the nip roller 27. It is preferable to increase the conveyance speed and reduce the rotational speed of the peeling roller 28 to make the linear velocity equal to the conveyance speed after the separation roller 28 is sandwiched between the peeling rollers 28 and 28.
It is best to give it after an appropriate period of time depending on the signal from. The nip roller 26 is a rotatable roller, and may be rotated by a motor (not shown), but as long as it is rotated by contact with the peeling roller 28 as described later. good. Further, the nip roller 27 may be any rotatable roller that is held by contacting the nip roller 26 and the peeling roller 28, and the upper part thereof is in contact with the surface of the laminate to be peeled. It is preferable that there be. The materials of the nip rollers 26 and 27 are not particularly limited, and may be of any material as long as they can grip and send out the film-like material to be peeled off between the nip rollers 26 and the peeling roller 28. The rotation axis of the nip roller 26 is movable as will be described later.

FIG. 4 shows a state in which the lithographic printing plate material 10 has progressed further and the cover film 11 has begun to peel off. The surface of the peeling roller 28 is made of an elastic member, as will be described later.
When it comes into contact with the tip of the lithographic printing plate material 10, it is pushed away by the hard support 13 of the lithographic printing plate material 10 and the surface is depressed, but it rubs the cover film 11 under the support 13, so the cover film 11
is peeled off along the surface of the peeling roller 28 in the direction of rotation thereof. In the figure, the intermediate photosensitive composition layer is omitted for convenience. The tip of the peeled cover film 11 is held between the peeling roller 28 and the nip roller 27 and sent out. When the tip of the peeled cover film 11 is further sent out downward in the figure, the peeled cover film 11 is not only held between the peeling roller 28 and the nip roller 27, but also is held between the peeling roller 28 and the nip roller 27. It may also be held and sent out by the rollers 26.

FIG. 5 is a diagram showing a state in which the cover film 11 is continuously peeled off. In the figure, peel roller 28 and nip roller 26 are moving in the directions of arrows 32 and 33, respectively, with peel roller 28 rotating in contact with nip roller 26. As a result, the cover film 11
is held between a peeling roller 28 and a nip roller 26 and peeled off. Peeling roller 28
The nip roller 26 is preferably moved at a timing when the tip of the peeled cover film 11 is nipped by the peeling roller 28 and the nip roller 26. For this purpose, for example, the support member 2
A conveying member for the object to be peeled is provided near 1, and the tip of the peeled cover film 11 is peeled off after a certain period of time after the sensor 24 detects the laminate to be peeled according to the conveyance speed. The timing may be adjusted when it enters between the roller 28 and the nip roller 27. In addition, the peeling roller 28 detects the force generated when the peeling roller 28 and the nip roller 27 pinch the tip of the peeled cover film 11 to pull the cover film 11 from the support 13, and uses the signal as a signal. Therefore, the rollers mentioned above may be moved. Alternatively, the tip of the support 13 from which the cover film 11 has been peeled off may be detected and the signal may be used. The movement of these rollers can be easily realized by various known means, so a description thereof will be omitted.
In FIG. 5, nip rollers 26 and 2
7 are rotating in the directions of arrows 31 and 34, respectively, because the friction between those rollers and the peeling roller 28 is large. Further, since the peeling roller 28 has moved downward, the cover film 11 does not come into contact with the remaining portion of the lithographic printing plate material 10 from which it has been peeled. Therefore support 1
Even if an image made of a layer of photosensitive composition is formed on the lower side of the photosensitive composition, the surface will not be scratched or stained. In other words, only the tip of the lithographic printing plate material comes into contact with the surface of the peeling roller 28 over a small width, so there is a risk of it getting dirty, but that width is not used as an image forming area, and is further exposed to light before being peeled off. All you have to do is leave it in a state where it is easy to do so. In this way, the lithographic printing plate material 10 is completely peeled off from the cover film 11 and sent out from the peeling section 20. When the sensor 25 detects that the laminate to be peeled has been sent out from the peeling unit 20, the operation of the peeling unit 20 is terminated automatically or by a switch (not shown), and the peeling roller 28 and the nip roller 26 is returned to its initial position.

Now, the peeling roller 28 will be explained. The peeling roller 28 has a characteristic surface that appears to dent when it comes into contact with a hard object, but it is made of a resilient material or shape that provides a considerable repulsion force against that object. It consists of Examples of materials include rubber, various brushes (made of nylon, animal products, etc.), and piano wire. Further, the surface shape may be smooth, but it may also have a partially protruding portion. Furthermore, since the film-like material to be peeled off is peeled off by rubbing due to contact with the peeling roller, the surface of the peeling roller must not be very flexible. Particularly preferable materials and shapes include pure rubber, urethane rubber, neoprene rubber, and known materials such as hiker rubber, and the shape of the protrusion is preferably cylindrical, conical, or hook-like. product name) or something similar.

The rotational speed of the peeling roller may be selected at an optimal value in relation to the conveyance speed of the laminate to be peeled. Further, the strength of contact between the peeling roller and the laminate can be appropriately selected depending on the material and shape of the surface of the peeling roller or the relationship between the conveying speed of the laminate and the rotational speed of the peeling roller. In particular, the distance between the outer periphery of the peeling roller and the laminate has a large effect on the peeling effect. The conveyance speed of the laminate may be slow until the film-like material is pinched by the peeling roller 28, the nip roller 26, and the nip roller 27, and thereafter may be increased to a high speed along with the rotational speed of the peeling roller 28.

Although the above embodiments have been described with respect to the case where lithographic printing plate materials are peeled and developed, the apparatus according to the present invention can be widely used as an apparatus for peeling film-like materials from a stack of other removable film-like materials.

In addition, in the embodiment, the nip roller 27
However, even without this roller, the film-like material can be peeled off by the peeling roller 28 and the nip roller 26. However, it is preferable that the nip roller 27 be present in order to properly clamp the peeled film-like material.

According to the device of the present invention, the film-like material is always peeled off with a constant tension, so that the peeled surface is clean. Furthermore, since the peeled surface is not rubbed with a roller or the like, the peeled surface does not get dirty. Therefore, as mentioned above, it is most suitable for uses such as developing lithographic printing plates.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an example of the structure of the laminate to be peeled off. FIG. 2 is an explanatory diagram of an example of the apparatus of the present invention. 3rd~
FIG. 5 is an explanatory diagram of how a film-like material is peeled off by the apparatus of the present invention. In the figure, 23 is a pressure member, 26 and 27 are nip rollers, 28 is a peeling roller, and 11 is a film-like material.

Claims (1)

[Claims] 1 B A peeling roller having an elastic surface, a nip roller that rotates in contact with the peeling roller, and a member that can press the laminate to be conveyed against the peeling roller, and The peeling roller contacts the tip of the film on the laminate while rotating in the opposite direction to the conveying direction, and then peels the film.Then, the peeled film is transferred between the peeling roller and the nip.・
A peeling device for a film-like material, characterized in that the film-like material is continuously peeled off while being held by rotation of rollers.