KR101002711B1 - Multi-layer type gravure offset roller - Google Patents

Abstract

PURPOSE: A multi-layered gravure offset roller is provided to maintain uniform line width in spite of repetitive printing by removing the cause of quality reduction, saturated solvent. CONSTITUTION: A multi-layered gravure offset roller comprises a base layer(510) and replacement layers(520,530,540). The base layer is made of a rubber material. The replacement layers are laminated on the base layer and include a rubber layer(543) to be peeled off and an intermediate layer(541) made of an adhesive material to be peeled off together with the rubber layer. The intermediate layer comprises a protection film(541-1) which covers the base layer or at least one replacement layer to prevent the infiltration of solvent and foreign materials, and an adhesive film(541-2) which is attached between the protection film and the rubber layer.

Description

Multi-layer type gravure offset roller

The present invention relates to a laminated gravure offset roller, and more particularly, to a gravure offset roller having an onion peel structure which is composed of a plurality of layers in a gravure offset printing system and is peeled off sequentially from a top layer after a certain use time.

In the case of semiconductor chips, the integration is very high, with the line width of several tens of nanometers, and the performance is also a member of a very high family. On the other hand, the display market is to implement a visible display device, so the density is very low as the pixel size is almost 100 microns or more.

In addition, Printed Electro-Mechanical System (PEMS) products, which are expected to emerge as new market products in the future, such as RFID tags, E-paper, and Solar-Cell, require large-area patterning, and the precision does not need to be very high. -Patterning products on the order of tens of microns. In addition, the market demands that prices be further lowered, and patterning of films, such as flexible substrates, is required.

However, since the exposure process, which is a production method of a conventional semiconductor or display product, is difficult to satisfy these conditions, a print production method has been proposed as an alternative.

In the printing production method, a flexible substrate is supplied by a roll-to-roll web feeder or a batch type feeder, and a screen, gravure, flexo, pad, inkjet, etc. By using various printing equipment of the patterning device by superimposing the conductive material, semiconductive material, insulating material to each characteristic. Of course, each printing process has different characteristics of the ink used, and the resolution and thickness also vary.

Among them, the gravure offset printing technique is suitable for roll-to-roll in micro patterning technique. However, the gravure offset printing technique is a process in which an offset rubber roller (also called a blanket) picks up ink from plate making and transfers it to a substrate.

At this time, the offset rubber roller repeats the absorption and dissipation of the solvent contained in the ink as the printing is repeated. In general, the amount absorbed is greater than the amount emitted, so that the solvent is gradually absorbed into the offset rubber, and the solvent content on the surface and inside of the offset rubber roller is gradually increased.

As a result, the properties of the offset rubber rollers are continuously changed, which affects the printing result, resulting in deterioration of the print quality and ultimately the life of the offset rubber rollers.

In addition, when the content of the solvent increases in the offset rubber roller, it becomes possible to observe that the printed line width increases in the final printed shape. Therefore, a graph showing the linewidth increase compared to the number of prints is shown in FIG. 1.

That is, it can be seen that the line width continuously increases as the number of prints increases. In this case, the printing pattern becomes irregular, which is one of the important factors that lowers the reliability of gravure offset printing.

Therefore, in order to prevent this, a period of rest is given to remove the solvent on the offset rubber roller. In this case, there is a problem that the advantage of roll-to-roll printing is lost because productivity is lowered.

In addition, the solvent absorbed deep inside the offset rubber roller is difficult to remove completely because it does not come out easily.

SUMMARY OF THE INVENTION The present invention aims to provide a laminated gravure offset roller in which the line width is kept constant even when the number of prints is increased in order to solve the problems according to the prior art.

Another object of the present invention is to provide a laminated gravure offset roller that maintains reliability while increasing productivity in roll-to-roll printing.

The present invention provides a stacked gravure offset roller of the onion shell structure in order to achieve the object posed above.

The laminated gravure offset roller includes a base layer made of a rubber material; At least one replacement layer of rubber material laminated on the base layer to a predetermined thickness and peeling off; And an intermediate layer disposed between the base layer and the at least one replacement layer and made of an adhesive material that is peeled off together with the replacement layer.

In this case, the intermediate layer, the protective film to cover the base layer to prevent the inflow of foreign matter and the solvent is absorbed from the upper; And an adhesive film adhered to the protective film and the at least one replacement layer.

The intermediate layer may also be placed between two replacement layers of the at least one replacement layer.

In addition, the replacement layer is characterized in that the perforated line is formed to peel off.

In addition, one end of the cut line may be formed with a cut portion that can be easily peeled off by the user by hand.

According to the present invention, the gravure offset roller forms an onion shell structure to block the absorption of the solvent in each shell to protect the other replacement layer of the rubber material inside the offset roller, and to keep the solvent only around the surface to evaporate the absorption amount. When a certain number of printing processes have been completed and the saturation of solvent is reached for each shell, the shell is peeled off from the top layer in order to expose another replacement layer of solvent-free offset rollers. Line width remains constant even if the number of prints is increased by eliminating the cause of poor quality.

In addition, another effect of the present invention is that by easily peeling only the top layer like an onion peel, the rest period is small and the productivity is increased.

In addition, another effect of the present invention is that despite the increase in productivity, the printing pattern remains uniform, so that the reliability of gravure offset printing can be increased.

1 is a graph showing an increase in linewidth compared to the number of prints according to the prior art.
2 is a conceptual diagram conceptually showing a gravure offset printing configuration according to an embodiment of the present invention.
3 is a diagram illustrating a gravure offset printing process according to the conceptual diagram of FIG. 2.
4 is a perspective view of a stacked gravure offset roller according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view of one side of the stacked gravure offset roller shown in FIG. 4 taken along the line X-X '.
FIG. 6 is a view illustrating a peeling off of the top layer of the stacked gravure offset roller shown in FIG. 4.

Hereinafter, a multilayer gravure offset roller according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a conceptual diagram conceptually showing a gravure offset printing configuration according to an embodiment of the present invention. Referring to FIG. 2, for gravure offset printing, a plate making 240 containing ink, a gravure roller 200 picking up ink from the plate making 240, and ink receiving the ink picked up by the gravure roller 200 are transferred. Offset rubber (210) roller 210 for transferring the to the substrate 220, pressure roller 230 for applying pressure to the offset rubber roller 210 is configured.

As shown in FIG. 2, the gravure offset printing process is divided into three types, such as the doctor doctor process 201 to 203, the off process 204 and 215, and the set process 216 to 218 of the ink. It can be divided into

FIG. 3 is a diagram for easily understanding the position illustrated in FIG. 2. That is, FIG. 3 is a diagram illustrating a gravure offset printing process according to the conceptual diagram of FIG. 2.

Referring to Figure 3, the gravure offset printing process is as follows.

1) When the gravure roller 200 rotates in the counterclockwise direction, the ink in the plate making 240 is picked up (201). Of course, the intaglio pattern 209 is regularly formed on the surface of the gravure roller 200 for this purpose. That is, when the gravure roller 200 is rotated counterclockwise while being locked to the plate making 240, the intaglio pattern 209 picks up the ink locked to the plate making 204.

2) Since the gravure roller 200 continues to rotate, it passes through the doctor blade 250 configured on one side (202). At this time, the ink picked up by the intaglio pattern 209 is wiped up and flows down the plate making 240.

3) The gravure roller 200 continues to rotate (203).

4) As the gravure roller 200 continues to rotate, it comes into contact with the offset rubber roller 210 (204). That is, since the gravure roller 200 rotates in the counterclockwise direction and the offset rubber roller 210 rotates in the clockwise direction, the intaglio pattern 209 contacts the offset rubber roller 210. At this time, the offset rubber roller 210 to adsorb the picked up ink. Of course, for this purpose, the offset rubber roller 210 is formed of a rubber material having elasticity but high strength.

5) The adsorbed ink 300 is separated from the gravure roller 200 to be completely attached to the offset rubber roller 210 (215).

6) The offset rubber roller 210 continues to rotate clockwise (216). At this time, the pressure roller 230 is rotated counterclockwise as opposed to the rotation direction of the offset rubber roller 210 to transfer the substrate 220 from left to right. Of course, the pressure roller 230 rotates while applying pressure toward the substrate 220.

7) When the offset rubber roller 210 continues to rotate, all of the ink adsorbed on the pressure roller 230, the substrate 220, and the offset rubber roller 210 may come into contact with each other (217). At this time, the adsorbed ink is transferred from the offset rubber roller 210 to the substrate 220.

8) If the offset rubber roller 210 continues to rotate, the ink adsorbed from the surface of the offset rubber roller 210 is separated and completely printed toward the surface of the substrate 220 (218).

For simplicity, the doctoring processes 201 to 203 fill the intaglio pattern 209, which is a gravure cell, with as much ink as possible from the plate making 240 and leave no ink in areas other than the intaglio pattern.

The off processes 204 and 215 adsorb as much ink as possible from the gravure roller 200 toward the offset rubber roller 210. Typically, however, only part of the ink is off.

The set processes 216 to 218 transfer the ink adsorbed from the offset rubber roller 210 to the substrate 220. That is, a process of printing ink on the substrate 220.

As this printing process is repeated, it is repeated to absorb and dissipate the solvent contained in the ink. Therefore, since the amount absorbed becomes larger than the amount emitted, the properties of the offset rubber roller 210 continue to change, and the solvent content gradually increases.

Therefore, according to one embodiment of the present invention, by setting the number of times or printing time, the outermost layer of the offset rubber roller 210 is peeled off. The structure of the offset rubber roller for this is shown in FIG. That is, Figure 4 is a perspective view of the stacked gravure offset roller 210 according to an embodiment of the present invention. Referring to FIG. 4, a cutout line 400 is formed to peel off the outermost layer, and a cutout portion 410 is formed on one side to allow the user to hold it by hand and easily peel off the outermost layer.

Of course, the cutout structure described in one embodiment of the present invention is to aid the understanding of the present invention, and other cutout structures are possible. For example, the surface may be cut in advance and the cut portion may be glued.

Then, the structure of the laminated gravure offset roller 210 will be described. A diagram showing this is shown in FIG. 5. That is, FIG. 5 is a cross-sectional view of one side of the stacked gravure offset roller shown in FIG. 4 taken along the line X-X '.

Referring to FIG. 5, there is a base layer 510 at a bottom thereof, and a first replacement layer 520, a second replacement layer 530, and a third replacement layer 540 are sequentially placed thereon.

Referring to the structure of the third replacement layer 540 among the replacement layers 520, 530, and 540, an intermediate layer 541 is formed on the lower layer, and a rubber layer 543 is placed on the intermediate layer 541. Of course, the replacement layer 543 may be made of a hard rubber material such as the base layer 510.

 The intermediate layer 541 is composed of a protective film 541-1 and an adhesive film 541-2. That is, the protective film 541-1 prevents foreign matter such as oil from adhering to the surface of the second replacement layer 530 on the surface of the second replacement layer 530, and from the solvent absorbed from the upper shell. It is to block the inner shell. Of course, when the foreign matter is deposited on the surface of the replacement layer (520, 530, 540) and the base layer 510, it causes a bad print pattern.

Therefore, this protective film 541-1 is used for the purpose of preventing this. On this protective film 541-1, an adhesive film 541-2 having both surfaces adhesive is placed. The protective film 541-1 and the third replacement layer 540 are attached to the adhesive film 541-2.

Therefore, the second replacement layer 530 is immediately exposed when the third replacement layer 540 is peeled off. That is, if it exists, since there exists an adhesive film 541-2, it becomes possible to remove all the protective film 541-1 and the rubber layer 543 at once.

The description of the third replacement layer 540 is equally applied to the second replacement layer 530 and the first replacement layer 520. Of course, although only three replacement layers 520, 530, 540 are illustrated in FIG. 5, this is for clarity of understanding and the number of replacement layers may be several.

Of course, if the replacement layers 540, 530, 520 are peeled off in order, each time it is peeled off, the gravure roller 200, the offset rubber roller 210, the substrate 220, the tender roller 230 shown in FIG. ), A process of correcting the position and size is performed. Since this correction process is usually performed using a computer, it is also possible to program in advance so that the correction can be made automatically.

FIG. 6 is a view illustrating a peeling off of the top layer of the stacked gravure offset roller shown in FIG. 4. Referring to FIG. 6, the third replacement layer 540 illustrated in FIG. 5 is peeled off. Of course, when the third replacement layer 540 is peeled off, the second replacement layer 530 is exposed.

Therefore, it becomes possible to perform the printing process described in FIGS. 2 to 3 again.

Although the preferred embodiments of the present invention have been described above, the scope of the present invention is not limited only to such specific embodiments, and those skilled in the art may describe the present invention in the detailed description, claims, and drawings. Changes may be made as appropriate within the scope.

200: gravure roller 209: engraved pattern
210: offset rubber roller 220: substrate
230: rolling roller 240: plate making
250: doctor blade
300: adsorbed ink 400: perforation
410: cutout 510: base layer
520: first replacement layer 530: second replacement layer
540: third replacement layer 541: intermediate layer
541-1: Protective film 541-2: Adhesive film
543: rubber layer

Claims (5)

A base layer made of rubber; And
At least one replacement layer comprising a rubber layer of rubber material in the form of being peeled off and laminated to a predetermined thickness on the base layer, placed between the base layer and the at least one replacement layer or between two replacement layers, the rubber Said at least one replacement layer comprising an intermediate layer of adhesive material peeled together and adhered to the layer
Laminated gravure offset roller comprising a. The method of claim 1,
The intermediate layer,
A protective film covering the surface of the base layer or the at least one replacement layer to prevent inflow of foreign substances and inflow of solvent absorbed from the upper layer; And
Laminated gravure offset roller comprising an adhesive film is formed between the protective film and the rubber layer and adhered to the surface of the protective film and the rubber layer. delete The method according to claim 1 or 2,
Laminated gravure offset roller having a perforation line to be peeled off the replacement layer. The method of claim 4, wherein
Laminated gravure offset roller having a cutout portion formed at one end of the cutout line.

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