JPH0538804A - Flexible printing roller - Google Patents

Abstract

PURPOSE:To provide a flexible printing roller which can perform a favorable printing on a hard plate such as a printable continuous steel plate, etc., on the surface of which a film is formed; and the manufacturing cost of which is low. CONSTITUTION:The present printing roller is constituted of a cylindrical shape thin flexible form plate body 1, and a rubber tubal base roll 2, which is fitted in the form plate body 1 and is expanded by injecting air inside to hold the form plate body by the outer peripheral surface while totally joining to the inner surface of previously mentioned form plate body, and is equipped with parts-to-be-chucked 2a' at both ends, which are chucked by roll chuck means of a printing machine. For the form plate body 1, nickel plating with a specified thickness is applied on a metal mother roll, or copper plating is applied after applying nickel plating to form a cylindrical plating film, and a sensitizing film is formed, and an image is baked and developed. Then, a form plate image is formed by etching, and the plating film is removed from the metal mother roll while keeping the cylindrical shape, and a resist is removed to obtain the title printing roller.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible printing roll suitable for printing a hard plate such as a continuous printable steel plate having a film formed on its surface.

[0002]

2. Description of the Related Art In the conventional steel plate printing method, in order to realize steel plate printing, a printable film having a thickness of about 20 μm is formed on the surface of a steel plate and printing is performed by a gravure offset method. The method of not printing by contacting the printing roll with the steel plate is the synergy between the steel plate not wrapping around the printing roll like paper and the fact that the printing roll also has eccentric runout of several tens of microns per position rotation. This is because, due to the action, the ink does not transfer well and the printing becomes defective.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a flexible printing which can be directly contacted with a continuous hard plate having a printable film formed thereon for good printing and is inexpensive to manufacture. It is intended to serve rolls.

[0004]

Means for Solving the Problems The present invention is, as a means for solving the above-mentioned problems, a flexible plate body formed in a cylindrical shape and having a sufficiently small wall thickness, and after passing through the inside of the plate body. A base roll made of a rubber tube, which is provided with air to be inflated into the inside to hold the inner face of the plate body in close contact with the outer circumferential face over the entire circumference thereof and has chucked portions chucked by roll chuck means of a printing machine at both ends. The plate body is made of a metal-made mother roll having a roll surface having a property capable of peeling the plating film, and is plated with nickel of a required thickness, or is plated with nickel and then copper-plated to form a cylindrical shape. A plating film is formed, a photosensitive film is applied to the plating film to dry it, an image is baked and developed, and the plating film is etched so as not to be blanked to form a plate image. Peeling from the roll maintains a plated coating in a cylindrical shape, it is to provide a flexible printing roll, characterized in that the resist formed by removing after forming the plate image or the plating film after the separation.

[0005]

The plate body is manufactured, and a base roll made of a rubber tube is passed inside the plate body to inject air into the plate roll to inflate the plate roll. Printing is performed by chucking the chucked portions at both ends of the base roll by the roll chuck means of the printing machine and bringing them into contact with a hard plate such as a steel plate. This flexible printing roll receives a small printing pressure from the printing pressure roll and is flattened to an extremely small extent. The flexible printing roll is rotated without contact with the steel plate, and the ink deposited on the printing roll is well transferred to the hard plate. Can print.

[0006]

Embodiments of the flexible printing roll of the present invention will be described with reference to the drawings. The flexible printing roll is a cylindrical plate body 1 having a sufficiently small wall thickness and is a plate body, and is passed through the inside of the plate body 1 and then air is blown into the plate body 1 to inflate the same. It comprises a base roll 2 made of a rubber tube that holds the inner surface of the plate 1 in close contact with the entire circumference.

The plate body 1 is made of a metal mother roll having a roll surface capable of peeling the plating film, for example, a stainless steel mother roll, plated with 50 μm thick nickel sulfamate, and then plated with copper. To a thickness of 30 microns to form a cylindrical plating film, apply a photosensitive film to the plating film to dry it, and print an image to develop, and etch the plating film to prevent blanking (ink is Etching the leaking cell to a depth smaller than the thickness of the plating film) forms a positive net gravure plate image, removes the resist, and finally presses a rubber roll to rotate it to form a net gravure plate image. The plated coating is kept in a cylindrical shape from the metal mother roll while being peeled off and pulled out. The nickel sulfamate plating is indispensable for keeping the plated coating on which the plate image is formed from the metal mother roll in a cylindrical shape and peeling it off. The nickel sulfamate plating has spreadability, and when a rubber roll is pressed, it extends in the circumferential direction and easily peels off from the metal mother roll. The base roll 2 made of a rubber tube has chucked portions 2a ′, 2 on both end faces thereof which are chucked by roll chuck means of a printing machine.
While the shaft body 2a having a'is molded,
The valve 2b is molded on one end surface. The base roll 2 is formed to be smaller than the diameter of the plate body 1 by 20 to 40 mm, and when air is introduced into the base roll 2 to inflate it, the plate body 1 is expanded.
The diameter can be expanded into a cylindrical shape that is larger than the diameter.

Therefore, when the base roll 2 is passed through the inside of the plate 1 and air is blown into the inside of the base roll 2 from the valve 2b to inflate it, the outer peripheral surface of the base roll 2 tightly adheres the inner surface of the plate 1 to the entire circumference. The printing plate 1 does not slip on the base roll 2 during printing. And edition 1
The flexibility is maintained because the base roll 2 is made of a rubber tube. Therefore, the flexible printing roll receives a small printing pressure from the printing pressure roll, is slightly flattened, is not contacted with the steel plate, is rotated without contact, and the ink deposited on the printing roll is satisfactorily applied to the hard plate. Transferable and good printing is possible.

The flexible printing roll of the present invention includes the following modifications. Without copper plating after nickel plating in the example, a photosensitive film is formed on the nickel plating, the image is baked and developed, and the plate image is formed by etching, and the plated coating is formed from a metal mother roll into a cylinder. It is a plate body that is formed by peeling it while maintaining the shape and removing the resist. The plate body 1 is formed by keeping the plated coating on which the plate image is formed in a cylindrical shape from a metal mother roll, peeling it, and then pulling it out, or before it is pulled out.
Chrome-plated to improve printing durability.
The plate image is not limited to the halftone gravure plate and must include relief plates. The rubber tube base roll 2 does not include the shaft body 2a having the chucked portions 2a 'and 2a', and both ends are made of hard urethane rubber or the like, and are conical holes formed as the chucked portions? , The shaft part is projected. After etching to form a plate image, the resist is not necessary, and the resist is not after etching but after the plating film is peeled off from the metal mother roll.

[0010]

As described above, according to the flexible printing roll of the present invention, the plate has flexibility and the base roll is also made of a rubber tube, so that the plate retains flexibility. As it receives a small printing pressure, it becomes flat and comes into contact with the hard plate to rotate and no uneven contact occurs. Therefore, it is possible to make direct contact with a continuous hard plate having a printable film formed on the surface for good printing. .. Further, according to the flexible printing roll of the present invention, the printing roll that has finished printing is deflated by evacuating the internal air of the base roll made of a rubber tube, and the base roll made of a rubber tube by pulling out the plate body, Combined with the printing plate to be printed next, the used printing plate can be stored or washed and cut into small pieces to be used as a plating material for the plate manufacturing process, which leads to a low manufacturing cost. ..

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a flexible printing roll of the present invention,

[Explanation of symbols]

 1 plate, 2 base roll, 2a 'chucked part,

Claims (1)

[Claims] 1. A flexible plate body which is formed in a cylindrical shape and has a sufficiently small wall thickness, and after being passed through the inside of the plate body, air is blown into the plate body to inflate it so that the inner surface of the plate body covers the entire circumference. A base roll made of a rubber tube having a chucked portion which is held in close contact and is chucked at both ends by roll chuck means of a printing machine.The plate body has a roll surface having a property capable of peeling a plating film. Apply a nickel plating of the required thickness to the provided metal mother roll, or perform a nickel plating and then a copper plating to form a cylindrical plating film, and apply a photosensitive film to the plating film to dry it to form an image. Baking and developing, to form a plate image by etching so as not to blank the plating film, peeling by keeping the plating film in a cylindrical shape from the metal mother roll,
A flexible printing roll, characterized in that the resist is removed after the plate image is formed or the plating film is peeled off.