JPS6111791B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention involves manufacturing a thin metal sleeve (hereinafter simply referred to as the sleeve) from a master roll using an electroforming method (including the plating method, hereinafter referred to as the plating method), and then printing an image on the sleeve. , relates to a method for manufacturing a printing roll, in which a shaft or a circular strip is passed through a sleeve, and a material that is fluid at room temperature or high temperature is injected into the gap between the sleeves and fixed to produce a gravure printing roll (hereinafter simply referred to as a printing roll). .

The conventional method for manufacturing printing rolls is roughly as follows.

(1) Fabrication of iron rolls (including precision polishing of the roll surface), (2) Copper plating as a ballad layer to a thickness of several tens to hundreds of microns, (3) Making the plated copper surface Fine polishing, (4) creating a release layer on the copper surface with a chromic acid aqueous solution, (5) polishing again several hundred times.
Copper plating to micron thickness, (6)
Polishing the plated copper surface again, (7) Applying photosensitive resin solution after degreasing and washing with water, (8) Baking the film prepared in advance, (9) Developing and washing with water, (10) Metal Corrode the exposed portion to a specified depth. (11) Peel off the photosensitive resin film. (12) Apply chrome plating to a thickness of about 10 microns.

Printing rolls manufactured through the above-mentioned processes have the following drawbacks, for example.

(1) The above-mentioned process must be followed for each plate, (2) Therefore, a finely polished iron roll must be prepared for each plate, (3) Management of heavy rolls, (4) The plating surface must be polished twice for each plate; (5) The plate-making process requires a lot of time and labor costs.

The object of the invention is to completely eliminate the above-mentioned drawbacks.

Next, the method for manufacturing a printing roll according to the present invention will be explained in order of steps.

(1) As shown in Figure 1, the surface 1 of an iron roll with precision is polished, degreased, washed with water, and then nickel plated 2 to a thickness of several 10 to several 100 microns in a nickel plating bath, for example. This roll is called master roll A. The adhesion between the iron surface 1 and the nickel surface 2 of the master roll A is strong. Also, it does not necessarily have to be nickel, but may also be chrome.

(2) Next, as shown in Figure 2, the surface of the master roll A is degreased, washed with water, and then nickel plated 3 to a thickness of 50 to 300 microns in the aforementioned nickel plating bath, for example. Next, as shown in FIG. 3, the nickel plating layer 3 is extracted from the master roll A after plating is completed. This nickel plating layer 3 is called a nickel sleeve. The method of pulling out the sleeve is exactly the same as the method of pulling out a sleeve for rotary screen printing. thickness 50
The surface of the nickel sleeve 3 with a thickness of ~300 microns can be made extremely smooth by the action of a leveling agent (for example, naphthalene/sodium disulfonate) added to the nickel plating bath, and the thickness can be controlled by the plating area and integrated current value. Can be easily managed. After being ground, the master roll is placed in a nickel-metsuki bath again to make sleeves. That is, the master roll is a specialized roll for producing sleeves. It is possible to make 5 to 10 sleeves per day with one master roll, and several thousand sleeves can be extracted from one master roll without damaging them, resulting in huge cost savings. Become something. Also, the sleeve has a thickness of 100 microns and a circumference of 510 mm.
m/m, surface length 1200m/m, and total weight only 1.5Kg, making it easy to move and easy to store as it is lightweight. Furthermore, since the surface of the sleeve is smooth, there is no need for polishing.For example, if the sleeve is made of nickel, the nature of nickel makes it difficult to oxidize in the air, and it is not as soft as copper, so it will not deform and can be stored for a long time. is also quite suitable. For metals other than nickel, for example, sleeves can be made from a copper plating bath containing a leveling agent in a similar manner.

(3) Next, as shown in Figure 4, put the shaft 5 and rubber balloon-like tube (hereinafter simply referred to as rubber tube) 4 into the nickel sleeve 3, feed compressed air through the inlet 6, and it will deform with a little force. Fix the nickel sleeve 3 to prevent it from happening. This method has traditionally been used to print images on rotary screen sleeves. A photosensitive resin liquid is applied to the surface of the fixed nickel sleeve 3 in the same manner as when an image is drawn on a general printing roll, followed by drying, baking, development, water washing and corrosion. Finally, the photosensitive resin film is peeled off. This step may be performed after fixing the nickel sleeve as described below.

(4) The shaft and rubber tube are fixed and corrosion has been completed. For example, nickel sleeves can be printed as is, and proofs and samples can be made.

(5) Next, after removing all the air in the rubber tube, put the nickel sleeve 3 into the mother mold B prepared in advance, as shown in Figures 5a and 5b, and connect the sleeve 3 with the metal circle. (It doesn't necessarily have to be a metal circle) A metal circle etc. 7 with an appropriate space between the shaft 8
and pass it through the nickel sleeve 3 and fix it to the mother mold B.

(6) Next, as shown in Figure 6, the matrix B is fixed and a fluid substance 10, such as cement as a non-metallic material, is injected from the injection port 9 set in the matrix B.
A metal such as lead alloy is melted and poured in to fix it.

(7) After printing is completed, the nickel sleeve 3 is torn or the metal, etc. packed therein is melted, and then removed, and the metal strip, etc. 7 and shaft 8 are used again.

As shown in Figure 7, the printing roll manufactured through the above steps is used as a printing surface for the thin layer metal 3 and as a support for the thin layer metal 3 during injection in a liquid state (or paste state) and subjected to constant operations. Substances solidified by
0, a metal circle etc. 7 as a support for the substance 10
It consists of As mentioned above, conventional printing rolls require repeated copper plating on a precision iron roll, and then polishing that requires precision for each plating, which is completely different from the case where the precision iron roll is attached until the end of printing. The method of manufacturing a printing roll according to the present invention has many advantages as follows, and its value is immeasurable.

(1) The iron rolls that required precision, which were conventionally manufactured for each plate, are no longer needed at all, and accurate iron rolls are only needed for sleeve production, and as a result, the number of iron rolls produced is drastically reduced.

(2) No polishing of the printed surface is required.

(3) Since the printing surface is a thin metal sleeve, it is easy to carry and store.

(4) Proof printing and sample printing can be done without leaving the sleeve, and can be done quickly and inexpensively.

(5) Only the necessary sleeves need to be manufactured on the roll for final printing, and fluid materials are used to fix the sleeves at low cost and can be fixed easily.

(6) Metal circles and the like that support fluid substances do not require any precision and can be reused.

(7) The entire process can be completed in a short time, and a significant reduction in costs can be expected. etc.

Examples will be given below to explain in more detail.

Example: After polishing the surface of an iron roll with a circumference of 509 m/m and a surface length of 1350 m/m, it was degreased and washed with water, and a current of 6 A/dm ³ was applied at 50°C in a nickel sulfamic acid bath, and the integrated current value was used to manage the surface. I performed the nickel metsuki. The circumference was set to 509.37 m/m, and this roll was used as a master roll.

Next, the master roll was degreased, washed with water, and nickel plated in the same nickel sulfamic acid solution under the same conditions to give a circumference of 510 m/m.The master roll was taken out of the plating bath, washed with water, and dried. Next, use a thin knife to lift the nickel layer from the master roll surface.
I squeezed and pulled the nickel layer out of the master roll. This nickel layer is called a sleeve. The master roll is used again in the plating bath to make the sleeve. Next, the sleeve is placed over a rubber tube fixed to the shaft, and compressed air is fed into the rubber tube to apply internal pressure so that it will not dent even when pressed strongly with a finger. Next, apply photosensitive resin liquid (TRR) using the usual method.
Spray coat the surface with a 3KW infrared heater and dry it for 10 minutes using two 3KW infrared heaters. Next, a previously prepared film is placed in close contact with the film and exposed using a xenon lamp. After exposure, the film was peeled off and developed with a prescribed developer. Next, we used an aqueous solution of 5% nitric acid and 20% hydrogen peroxide as a corrosive solution and sprayed it to a depth.
Corroded to 35 microns. After the corrosion was completed, it was washed with water, the photosensitive resin film was peeled off with a stripping solution, washed with water again, and dried. After drying, I placed it in a gravure proofing machine in this state and printed it, and the result was a print that was the same as a conventional one.

Next, the compressed air was removed and the sleeve was removed.

A steel circle with a circumference of 445m/m and a surface length of 1250m/m was fixed in advance to a steel shaft with a diameter of 40m/m and a surface length of 1700m/m, and then the corroded sleeve was passed through and a concrete roll matrix was attached. paste cement was poured from the injection port and left overnight. The next day, the printing roll was removed from the matrix, degreased, washed with water, dried, and then placed in a gravure printing machine for printing, resulting in prints that were completely the same as conventional ones. After printing was completed, the nickel sleeve was torn off from the edge and the cement was hammered to break it, allowing the shaft and the circular paper fixed to the shaft to be reused.

[Brief explanation of drawings]

Figure 1 is a schematic cross-sectional view of a master roll with a finely polished iron roll surface plated with nickel or the like, and Figure 2 is a schematic cross-sectional view of a roll with a master roll plated with nickel or the like to form a sleeve on the master roll surface. A cross-sectional view, Figure 3 is a schematic side view showing the direction in which the sleeve is removed from the master roll, Figure 4.
Figure 5a is a schematic cross-sectional view of the matrix for fixing the sleeve, and Figure 5b is Figure 5.
Fig. 6 is a schematic cross-sectional view of the sleeve, shaft, and circle injected into the matrix after the sleeve, shaft, and cone were set in the matrix, and Fig. 7 is a schematic diagram of the printing roll taken out from the matrix. A cross-sectional view is shown.

Claims (1)

[Claims] 1. A metal sleeve with a thickness of 50 to 300 microns as a printing surface is produced by electroforming using a master roll, and after being pulled out, a sheet of fluidity at room temperature or at high temperature is placed in the gap between the metal sleeve and the circular strip or shaft. 1. A method for manufacturing a printing roll, which comprises filling and solidifying a non-metal or metal.