JPS5831146Y2 - Seamless resin printing plate - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a printing design roller, and more particularly to a seamless resin printing plate.

Conventionally, printing of continuous designs such as woodgrain printing, wallpaper, and wrapping paper has been mainly performed by gravure printing and letterpress printing.

Among these, rubber plates, vinyl chloride plates, and steel plates are mainly used as plate materials for seamless printing plates using the letterpress method, but recently, photosensitive resin layers have been used in the letterpress printing field. Various techniques for producing seamless printing plates using photosensitive resins have also become available.

The advantage of using a photosensitive resin layer is that seamless printing plates can be manufactured easily even with complex images, and are superior to conventional plate materials in terms of cost and delivery time.

By the way, once printing of a certain design is finished, seamless printing plates are generally recycled into new designs in order to reduce cylinder costs, and seamless printing plates using a photosensitive resin layer are also easily recycled. Must.

Furthermore, in a seamless printing plate for letterpress printing, the cylinder material and the image-bearing resin layer must be at least partially connected to each other with sufficient adhesive strength to prevent them from peeling off due to vibrations during printing or shocks during handling of the cylinder.

However, conventional seamless printing plates using photosensitive resin layers include those in which the plate is mounted on the cylinder surface material with double-sided adhesive tape and the two ends are joined together, and those in which the photosensitive layer is molded on the cylinder material, exposed and developed. However, with the former, if the design is complex, it is very difficult to join both ends, and if the cylinder width is long, it is difficult to join even if the design is simple, and if the joining is insufficient, it will be difficult to join the ends. There is a problem in that the joints tend to peel off during printing.

In the latter case, the photosensitive layer is in direct contact with the cylinder material, but because the adhesion between the photosensitive layer and the cylinder material is not sufficient, there is a problem that the resin layer partially lifts from the cylinder material due to heat generation and vibration during printing. occurs.

Furthermore, in fields where seamless printing plates with a thick resin layer of 3 to 5 mm are used, such as wallpaper printing, the entire resin layer is removed each time it is recycled, as photosensitive resin is more expensive than conventional rubber materials. Rather than doing so, it is strongly desired to remove and regenerate only a portion of the upper layer of the resin layer.

However, for the reasons mentioned above, if a portion of the resin layer is removed from the entire circumference of the cylinder, the problem arises that the resin layer partially peels off from the cylinder material, which prevents the regeneration work from proceeding smoothly. is often seen.

The purpose of this invention is to maintain the advantages of a seamless printing plate made of photosensitive resin while also preventing the peeling of the resin layer during printing, recycling process, and other cylinder handling due to the poor adhesion between the resin layer and the cylinder material as described above. The purpose of the present invention is to provide a seamless resin printing plate that solves the above problems.

The present invention provides spiral grooves on the circumferential surface of the cylinder, an adhesive layer that can adhere to both the cylinder material and the resin layer forming the image area, and a photosensitive resin layer on the adhesive layer. The present invention provides a seamless resin printing plate characterized by having a resin layer having an image area.

Examples of materials used for the cylinder in the present invention include metal and plastic.

Hereinafter, the present invention will be explained with reference to drawings showing embodiments.

For example, a groove 4 is helically carved on the circumferential surface of the metal cylinder 1.

This groove is provided to easily increase the adhesive area and provide an anchor effect to strengthen the adhesive force between the adhesive layer and the cylinder material.

Generally, graining is a well-known method for increasing the bonding area, but it is not easy to grain the circumferential surface of a cylindrical object, and it is also difficult to carve deeply.

On the other hand, carving a spiral groove on the circumferential surface of a cylinder can be done very easily and quickly using a lathe, for example, and the pitch and depth of the spiral can be freely selected.

However, in order to firmly adhere the adhesive layer to the metal cylinder body, the pitch should be approximately 5 mm or less, and the groove depth should be approximately Q, 1 mm.
It is preferable to do the above.

For example, if the grooves are not carved in a spiral shape, but separated into individual grooves, the machining process becomes complicated and is not practical.

Also, it is more important to carve grooves in the width direction of the cylinder.
Processing work becomes complicated and impractical.

Furthermore, when regenerating the cylinder, if the entire adhesive layer is removed,
A spiral groove allows continuous cleaning and is very convenient for work.

As mentioned above, in terms of workability and effectiveness, it is most preferable to carve in a spiral shape.

Next, an adhesive layer 2 is provided on the grooved cylinder, which adheres well to both the cylinder and the resin layer having the image area.

The material used for this adhesive layer can be anything as long as it adheres well to the cylindrical material and the resin layer, but usually epoxy adhesives, urethane adhesives, amino adhesives, phenol adhesives, etc. Type adhesives, glue, etc. are used.

However, adhesives are not preferred.

The thickness of this adhesive layer is not particularly limited in terms of the effects of the present invention, but a range of 1 to 3 mm is desirable for processing purposes.

Methods for providing the adhesive layer include, for example, brush coating and spatula coating, as well as methods such as supplying a substance that will become the adhesive layer onto the cylinder while rotating the cylinder and applying it to a constant thickness with a doctor.

Finally, a resin layer 4 having an image area is provided on the adhesive layer by using a conventional technique for molding a photosensitive resin to a constant thickness on a cylinder material.

In this way, a seamless printing plate can be obtained by exposing to light after providing the photosensitive layer or simultaneously with the formation of the photosensitive layer, and then performing the necessary steps including development.

The seamless resin printing plate provided by the present invention has spiral grooves carved on the circumferential surface of a cylinder material, and an adhesive layer that adheres to both the cylinder and the resin layer having the image area is provided between them. Therefore, the cylinder and the resin layer are sufficiently strongly connected.

Therefore, there is no phenomenon in which the resin layer carrying an image peels off from the cylinder during printing, and even in the process of recycling the seamless printing plate, when a part of the resin layer is removed, the remaining resin layer does not peel off. Ta.

Therefore, in the case of recycling a seamless printing plate with a thick resin layer, the amount of newly used photosensitive resin can be saved.

As described above, according to the present invention, when manufacturing a seamless printing plate, the advantages of using photosensitive resin are maintained, while the problems that conventionally occurred with seamless printing plates using photosensitive resin are maintained. This also solves the problem of partial peeling of the resin layer from the cylinder material during printing, recycling, etc.

The present invention is applicable not only to seamless printing plates for letterpress printing, but also to seamless printing plates for all printing methods using photosensitive resin layers, including letterpress.

Reference numeral 5 in FIG. 2 showing the embodiment is used when the cylinder and cylinder shaft are separate.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing one embodiment of the present invention, and FIG. 2 is a side sectional view showing another embodiment. In the figure, reference numeral 1 indicates a metal cylinder, 2 indicates an adhesive layer, and 3 indicates a photosensitive resin layer.

Claims (1)

[Scope of utility model registration request] A seamless resin printing plate characterized in that a photosensitive resin layer with an image formed thereon is provided on a cylinder having a spiral groove on the circumferential surface of the cylinder via an adhesive layer.