ES2237986A1 - Ink supply device for use in flexographic web press, has power control cylinder provided with chamber, where entry unit of chamber is connected to feeding unit, and chamber comprising open hopper - Google Patents

Abstract

The device has a power control cylinder (2) provided with a chamber (1), where an entry unit (11) of the chamber is connected to a feeding unit (7). The chamber comprises an open hopper (5) that is connected with the entry unit. A tank (6) is located below the chamber.

Description

Ink feeding device for rotary flexographic printers.

The present invention relates to a device ink supply for flexographic rotary printers, which combines the advantages of current closed camera techniques and with bucket.

Background of the invention

The traditional ink feeding system for flexographic rotary printers used for a long time time, also called with a bucket, comprises a bucket provided with ink in contact with a rotating rubber cylinder, called donor cylinder This donor cylinder is in contact with a cylinder ceramic ink feeder, also called anilox cylinder, the which is provided with a plurality of microperforations, which are the ones that feed the ink.

This ink feeder cylinder is at your time, in contact with the cylinder holder cylinder, which is in contact with the print counter cylinder, over which the paper to be printed.

This system with traditional bucket, which currently used occasionally, it has the disadvantage that does not allow high speeds, which is incompatible with some production speeds currently required. This slowness is because the bucket is open, and a rotation speed Too high, it may cause the ink to splash.

To solve the low speed problem of this traditional system have been devised power devices of ink with a closed chamber. These devices comprise a closed chamber filled with ink that is placed against the cylinder rotary feeder. These cameras are intended to be virtually watertight so they can work at high speeds.

Closed cameras currently used they comprise an ink inlet opening connected to a tube, and an outlet for the removal of the excess ink from the contact area between the chamber and the feed cylinder.

These camera ink feed systems closed have the disadvantage that their exchange for others cameras of different color is very slow, since they must be disassembled the tubes and wash them. This inconvenience is especially important. in cases where the same rotary printer must change the Color four and five times per turn.

Description of the invention

With the power device of the invention manages to solve the aforementioned drawbacks, presenting other advantages that will be described.

The ink feeding device for flexographic rotary printers of the present invention it comprises a chamber where the ink to be fed is placed to a rotating feed cylinder, said chamber comprising an ink inlet to it and a feeding zone in contact with said feed cylinder, and is characterized by the fact that said chamber comprises an open hopper in communication with said ink inlet.

Thanks to this feature, the device The present invention combines the advantages of current systems Closed chamber with bucket. Specifically, it is much easier to clean that closed camera systems because you can even Feed the ink to the hopper without the need for pipes. Too allows the print speed to be as or faster than the conventional closed chamber.

Another important advantage is that the ink can be seen, being able to easily manipulate its color during its Rotary printer operation and at the same time you can See the behavior of ink, circulation, foam, etc.

Because it can be used without pipes, allows inks with more pigmentation to be used less special liquids and inks, such as cationic, which it is done with great difficulty in closed camera systems conventional.

Another essential advantage is that it is totally Compatible with closed camera systems. That is, if the user wants to use the power device of the present invention and subsequently exchange it for a device camera closed, you can do it as many times as you want, depending on the type of ink, the number of changes in the ink necessary and their specific needs.

The feeding device of the present invention also comprises a reservoir located below said chamber, which can use the remaining ink in the area of rotating cylinder feed.

Advantageously, said deposit may be communicated with said hopper, so that the ink in said tank it can be fed to said hopper through a circuit and, in consequently, said ink can be reused.

Preferably, said circuit connecting said Tank with said hopper comprises a valve and a pump.

Also advantageously, said camera can comprise a whisk inside, operated from the outside through the opening of the chamber, which is necessary in the case of use very thick inks.

Brief description of the drawings

For a better understanding of how much has been exposed Some drawings are accompanied in which, schematically and only to non-limiting example title, a case study of realization.

Figure 1 is an elevation view of a rotary printer that incorporates the power supply device ink of the present invention; Y

Figure 2 is an elevation view of the Ink feeding device of the present invention.

Description of a preferred embodiment

As can be seen in Figure 1, the rotary printing device to which the device is applied Ink supply of the present invention comprises a chamber 1 inside which the ink is housed, a cylinder of feed 2, also called an anilox cylinder, a cylinder slide holder 3, and a print counter cylinder 4, above the which passes the paper to be printed.

As is known, the feed cylinder 2 is ceramic and comprises a plurality of microperforations, which they house the ink supplied through the device of the present invention. This feed cylinder 2 is in contact with the Cylinder holder cylinder 3, on whose surface are the cliches with the design that you want to print on the paper that passes over the print counter cylinder 4.

According to the invention, and as can be seen better in figure 2, the ink chamber 1 comprises a hopper 5 open, which is where the ink is deposited 5. This hopper 5 is communicates with camera 1 through an input 11.

Chamber 1 is in contact with the cylinder of feed 2 through a feed zone 7, which is substantially tight. In this way the feed cylinder 2 can rotate at a high speed, unlike systems bucket classics, and in the same way as current systems Closed camera Although it is indicated that the feeding zone 7 is substantially tight, it is clear that there will always be a leftover of ink, which is deposited in a reservoir 6.

This tank 6 is connected to said hopper 5 by a circuit 9, comprising a valve and a pump 10, of so that the ink in said tank 6 passes to the hopper 5 when desired

As is evident, the ink inside the hopper 5 and, consequently, inside the chamber 1 is perfectly visible from the outside, knowing its behavior and status during printer operation rotary

For example, it would not be necessary to stop the rotary printer if you want to adjust the color of the ink, being able to add ink to hopper 5 manually, which is impossible with known closed camera systems currently.

Also, if you want to change the printing ink in very short jobs without recirculation, you simply have to withdraw chamber 1 and reservoir 6, without the need to clean any tube of power, as in the case of closed chamber systems.

Even, if desired, the device of the present invention could be replaced by a camera device Conventional closed, and vice versa. That is, on the same printer Rotary both devices can be used alternately, Depending on the needs.

In the case that is necessary due to the characteristics of the ink used, if very inks are used thick, inside the chamber 1 you can place a whisk 8, so that the ink maintains viscosity characteristics sufficient for proper use in printing.

Although reference has been made to a Concrete embodiment of the invention is evident to an expert in the matter that the ink feeding device described is susceptible of numerous variations and modifications, and that all the mentioned details can be replaced by others technically equivalent, without departing from the scope of protection defined by the appended claims.

Claims (5)

1. Ink feeding device for flexographic rotary printers, comprising a chamber (1) where the ink to be fed to a rotating feed cylinder (2) is placed, said chamber (1) comprising an inlet (11) of the ink thereto and a feed zone (7) in contact with said feed cylinder (2), characterized in that said chamber (1) comprises an open hopper (5) in communication with said inlet (11 ) of the ink. 2. A feeding device according to claim 1, characterized in that it also comprises a tank (6) located below said chamber (1). 3. Feed device according to claim 2, characterized in that said reservoir (6) is communicated with said hopper (5), so that the ink in said reservoir (6) can be fed to said hopper (5) at through a circuit (9). 4. A feeding device according to claim 3, characterized in that said circuit (9) connecting said tank (6) with said hopper (5) comprises a valve and a pump (10). 5. Device according to any of the preceding claims, characterized in that said chamber (1) comprises a beater (8) inside.