Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F7/00—Rotary lithographic machines
  • B41F7/20—Details
  • B41F7/24—Damping devices
  • B41F7/32—Ducts, containers, or like supply devices for liquids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F7/00—Rotary lithographic machines
  • B41F7/20—Details
  • B41F7/24—Damping devices
  • B41F7/26—Damping devices using transfer rollers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F7/00—Rotary lithographic machines
  • B41F7/20—Details
  • B41F7/24—Damping devices
  • B41F7/30—Damping devices using spraying elements

Definitions

• the invention relates to dampening systems with dampening solution supply and return device according to the preamble of claim 1, 3 or 11.
• a dampening unit consists, for example, of a dampening roller, also called a water box roller, a dampening solution box and devices for supplying and returning dampening solution into the dampening solution box.
• the dampening roller is partially immersed in the dampening solution in the dampening solution box, takes it up by rotation and transfers it to other rollers of the printing unit.
• it is important that the dampening solution absorbed by the dampening roller has the same physical and chemical properties over the entire length of the roller.
• a dampening unit with at least one dampening solution pick-up roller wherein a dampening solution supply line extending parallel to this roller and extending over its entire length is arranged above the dampening solution pick-up roller.
• the underside of the supply line is provided with outlet openings through which a water curtain is generated after the supply line has been loaded with dampening solution.
• DD 247414 A1 suggests pressing a scraper in the radial direction against the outer surface of the roller with the same pressure over the entire length of the roller.
• a dampening solution circulation system for offset printing machines is described in EP 0638417 A1.
• a dampening solution supply line with hole-shaped recesses and a dampening solution collecting rod, which is at a defined small distance from the dampening duct, are assigned in parallel to the dampening duct.
• DE 3831 741 A1 discloses a dampening solution box with several inlet lines and several outlet lines.
• DE 1761 908 A discloses an adjustable dampening solution supply.
• the invention has for its object to provide dampening systems with dampening solution supply and return device.
• the dampening duct between the inlet device and the return device of the Fountain solution is arranged in the fountain solution box.
• the inlet device and the return device are such that the inlet and the return of the dampening solution in the area of the dampening duct take place at several locations.
• the invention is based on the idea of creating a dampening system in which a uniform exchange of dampening solution takes place over the entire length of the dampening duct.
• dampening solution supply points several points for the supply of dampening solution
• dampening solution return points several points for the return of dampening solution
• the dampening duct is therefore located in the area of the dampening solution flow which is generated by the supply and return of the dampening solution into and out of the dampening solution box.
• the positions for inlet and return are coordinated with one another in such a way that in the area of the dampening roller there is uniform mixing of the dampening solution supplied and already in the dampening solution box. For example, the spatial arrangement of the inflow and outflow points can be adjusted accordingly.
• the inlet device is arranged as a separate component on the dampening solution tank. This is particularly advantageous if the inlet device has to be dismantled due to damage or contamination, for example. In the present case, the inlet device designed as a separate component can then be removed from the dampening solution box in a simple and cost-effective manner. A cost-intensive complete disassembly of the dampening solution box is therefore not necessary.
• the feed line is attached essentially centrally to the feed device. This has the advantage that an almost identical dampening solution pressure prevails at all dampening solution supply points of the supply device after loading of the supply line with dampening solution. A drop in pressure, as is the case when the supply line is arranged on one side of the supply device, is thereby significantly reduced.
• the inlet device is designed is not important for the principle of the invention.
• the inlet device is designed as a waveguide, such as a round tube.
• dampening solution supply points designed as circular or rectangular recesses are arranged along the entire length of the waveguide and are equally spaced from one another.
• Another possibility is to provide a rectangular recess on the waveguide, which extends essentially over the entire length of the waveguide, for the passage of the dampening solution.
• the inlet device consists of at least two waveguides arranged one behind the other in the longitudinal direction, of which each waveguide is supplied with dampening solution separately by means of a feed line, the two waveguides being functionally separated from one another.
• the return device consists of at least two recesses arranged in the bottom of the dampening solution box, through which the dampening solution can be returned from the dampening solution box into the dampening solution reservoir.
• the dampening solution box if the recesses are arranged parallel to the longitudinal axis of the dampening duct. A return device to be created in this way is particularly simple and inexpensive to implement.
• the return device has a comb-shaped component which precedes the recesses in the bottom of the dampening solution box.
• the comb shape of the component is formed by alternating areas with serrated elevations and incisions, with each incision area being assigned a recess in the bottom of the dampening solution box.
• the comb-shaped component is arranged parallel to the longitudinal axis of the dampening duct.
• the comb-shaped component extends over the entire length of the damp duct and the serrated ridges point vertically upwards.
• the incisions result in a kind of cross-sectional enlargement in this area, as a result of which the dampening solution can preferably flow into the recesses downstream of the incisions and is thus guided away from the latter over the entire length.
• the lines for supplying and returning the dampening solution from or into the dampening solution reservoir are double-walled in order to achieve a kind of thermal decoupling between the dampening solution-carrying line and the ambient air. Without thermal decoupling, the moisture contained in the air can condense on the lines exposed to the dampening solution, and drops form which can, for example, be deposited in areas of the printing unit and / or on the material web to be printed, which in turn can lead to malfunctions in printing operation.
• the cavity of the double-walled supply and return line is foamed.
• the temperature of the water supplied from the dampening solution reservoir To tune the dampening solution so that the dampening solution picked up by the dampening duct has essentially the same temperature along its entire length, it makes sense if a temperature measuring device is provided in at least two places in the area of the dampening duct and the temperature measuring device is coupled to a control and / or regulation system , which regulates the temperature of the dampening solution supplied.
• Figure 1 shows a dampening system with dampening solution box, dampening device and devices for the supply and return of dampening solution in cross section.
• FIG. 2 shows a dampening unit according to FIG. 1 in a frontal view in the cutting direction A, without a comb-shaped component;
• FIG. 3 shows a dampening unit according to FIG. 1 in a frontal view in the direction of cut B, without a dampening device.
• FIG. 1 shows a dampening system with the devices for supplying and returning dampening solution 01 into and out of the dampening solution box 02.
• the dampening device 03 is attached between the inflow device 04 and the return device 06, the inflow device 04 being arranged on the front opposite the damping device 03.
• the inlet device 04 consists of at least one distribution pipe 18 with several openings 07 (FIG. 2).
• the distribution tube 18, as shown in FIG. 2 is arranged as a separate component in the dampening solution box 02, which is essentially preferably located completely below the liquid level of the dampening solution 01.
• the distribution tube 18 is designed as a waveguide 18 in the form of a round tube 18 and has an inner tube diameter of approximately 10 mm to 20 mm, in particular of 12 mm.
• the longitudinal axis of the distribution tube 18 runs parallel to the longitudinal axis of the damp duct 03, the length of the distribution tube 18 essentially extending to the length of the damp duct 03.
• dampening agent supply points 07 designed as circular recesses 07 are arranged over the entire length of the distribution tube 18, the circular recesses 07 pointing in the direction of the dampening duct 03.
• dampening solution 01 By applying dampening solution 01 to the distribution pipe 18, dampening solution 01 can exit through the dampening solution supply points 07, whereby dampening solution 01 is supplied to the dampening solution box 02, essentially over the entire length of the dampening duct 03.
• the end faces of the distribution tube 18 are each closed, so that no dampening solution 01 can flow out of them.
• the circular recesses 07 are spaced equidistantly from one another and all have the same diameter. The distance to each other.
• the diameter of the circular recesses 07 is typically in the range between 1 mm and 5 mm, in particular 3 mm.
• the cross section of the circular recesses 07 corresponds to approximately 25% of the diameter of the round tube 04.
• dampening solution 01 between the distribution pipe 18 and the dampening duct 03 is the same over the entire length of the dampening duct 03 due to the parallel orientation of the dampening duct 03 and the distribution duct 18. Due to the fact that the dampening system 03 feeds dampening solution along its entire length 07 are arranged opposite one another, dampening solution 01 can be fed uniformly to the dampening solution box 02, essentially over the entire length of the dampening duct 03.
• the distribution pipe 18 is supplied with dampening solution 01 from a dampening solution reservoir (not shown) through a feed line 08.
• a dampening solution reservoir not shown
• the supply line 08 is arranged centrally on the distribution tube 18. In contrast to a one-sided supply of the dampening solution
• the dampening solution 01 must travel a substantially shorter flow path until the outlet from the dampening solution supply points 07, given the same length of the distribution pipe 18. Furthermore, in the case of the centrally arranged supply line 08, compared to the one-sided supply line, with the same number of dampening solution supply points 07, only about half of the dampening solution supply points 07 are arranged in series, which results in a substantially lower pressure difference between widely spaced dampening supply points 07, and thus a substantially equal pressure of the outflowing dampening solution can be achieved at all dampening supply points 07.
• the feed line 08 is designed in the form of a curved round tube 08, which is either in one piece or can consist of several components which are screwed, welded or brazed to one another, for example.
• the connection of the distribution pipe 18 and the feed line 08 can also be established by means of a screw, welded or brazed connection.
• the feed line 08 also assumes the function of a holder for the distribution pipe 18, as a result of which a separate frame for holding the distribution pipe 18 in the dampening solution box
• the damping duct 03 is assigned a plurality of distribution pipes 18.
• Each of the distribution pipes 18 has its own feed line 08.
• At least one inlet line 08 of the distribution pipe 18 is arranged between a last opening 07 of a first end and a last opening 07 of a second end of the distribution pipe 18, in particular in the middle. In the case of several inlet lines 08, these are arranged approximately uniformly distributed with respect to the longitudinal direction of the distribution pipe 18.
• the last two openings 07 of the ends of the distribution tube 18 are spaced apart
• I02 l01 / N + 1 , where N is the number of inlet lines 08 and 101 the distance between the last two openings of the distribution pipe 18.
• the openings 07 of the distribution tube 18 are arranged below the level of the dampening solution 01, ie in the dampening solution 01.
• the supply lines 08 are also arranged in the dampening solution 01 from the side of the dampening solution box 02 to the center of the distribution pipe 18. j
• the feed line 08 of the distribution pipe 18 is at least partially in the longitudinal direction of the Moisturizer 03 arranged in the dampening solution.
• the return device 06 has a double-walled collecting container 16 which is connected to the dampening solution box 02 and extends in the longitudinal direction of the dampening duct 03 (FIG. 1).
• the return device 06 is arranged on the rear opposite the dampening duct 03.
• the return device 06 consists of two components, namely recesses 09 in the bottom of the dampening solution tank 02 for the backflow of the dampening solution 01 flowing out of the area of the dampening duct 03 and a comb-shaped component 12 which is connected upstream of the recesses 09.
• the circular recesses 09 have a diameter of 10 mm to 30 mm, in particular 23 mm.
• the comb-shaped component 12 is oriented parallel to the longitudinal axis of the dampening device 03 and extends over the entire width of the dampening solution box 02.
• the recesses 09 in the bottom of the dampening solution box 02 are parallel to the longitudinal axis of the dampening device 03, essentially over the entire length of the dampening device 03 , arranged.
• FIG. 3 shows the dampening unit in the area of the return device 06 in the cutting direction B, without the dampening device 03.
• the comb-shaped component 12 and the recesses 09 arranged in the bottom of the dampening solution box 02 can be seen from the front.
• the comb-shaped component 12 is mounted on the bottom of the dampening solution box 02 and oriented perpendicularly to the latter.
• the comb-shaped component 12 is designed in the form of a comb plate 12 with serrated elevations 13.
• the serrated elevations 13 have a longitudinal extent of 100 mm to 300 mm, in particular of 200 mm.
• the elevations 13 in the manner of serrations are formed by the fact that essentially upwardly open, parallel incisions 14 formed dampening solution return points 14 with rectangular ones and / or triangular and / or arcuate transition in the comb plate 12 are provided. Both the incisions 14 and the serrated elevations 13 are located below the liquid level of the dampening solution 01 in the dampening solution box 02, so that the dampening solution 01 coming from the dampening duct 03 can flow off over the entire length of the comb-shaped component 12.
• the collecting container 16 extends in the longitudinal direction of the dampening duct 03 and in the transverse direction with a fraction of the width of the dampening solution container 02.
• the double-walled collecting container 16 is foamed.
• Both the incisions 14 in the comb plate 12 and the recesses 09 in the bottom of the dampening solution box 02 are each spaced equidistantly from one another and extend over the entire length of the dampening duct 03.
• the distance between the serrated elevations 13 is 1 mm to 20 mm, in particular 5 mm.
• the arrangement of the cuts 14 in the comb plate 12 and the respective recesses 09 in the bottom of the dampening solution box 02 means that dampening solution 01 can be guided away from the area of the dampening duct 03, essentially over the entire length of the dampening duct 03.
• the flow path of the dampening solution 01 between the dampening device 03 and the return device 06 is the same over the entire length of the damping device 03 due to the parallel arrangement of the damping device 03 and the return device 06. Due to the fact that the dampening duct 03 essentially over its entire length Dampening solution return points 09; 14 are arranged opposite one another, dampening solution 01 coming from the direction of the dampening duct 03 can be guided away uniformly over the entire length of the dampening duct 03 from the area of the dampening duct 03.
• both the longitudinal axes of the inlet 04 and return device 06 run essentially parallel to the longitudinal axis of the dampening duct 03, as do dampening agent inlet 07 and dampening agent return points 09; 14 on the back, essentially over the entire length of the dampening duct 03, opposite the dampening duct 03, can be supplied by dampening fluid 01 to the dampening duct 03 uniformly over its entire length and guided away uniformly from it by essentially the same pressurization of all dampening solution supply points 07 become.
• dampening solution 01 is additionally supported by setting the direction of rotation 17 of the dampening duct 03 in the flow direction of the dampening solution 01. Due to the uniform mixing of the supplied dampening solution 01 located in the dampening solution box 02, the dampening solution 01 received by the dampening duct 03 has the same physical and chemical properties over the entire length of the dampening duct 03.
• an additional partition wall with recesses 09 can be arranged between the dampening solution boxes 02 and the collecting container 16.
• the inflow and the return flow to the dampening solution inflow 07 and Dampening solution return points 09; 14 is adjustable.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Rotary Presses (AREA)

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• 2002
  • 2002-05-18 DE DE10222294A patent/DE10222294A1/de not_active Withdrawn
• 2003
  • 2003-04-24 WO PCT/DE2003/001330 patent/WO2003097359A1/fr not_active Application Discontinuation
  • 2003-04-24 US US10/513,795 patent/US7237481B2/en not_active Expired - Fee Related
  • 2003-04-24 EP EP03727214A patent/EP1515847B1/fr not_active Expired - Lifetime
  • 2003-04-24 AU AU2003233760A patent/AU2003233760A1/en not_active Abandoned
  • 2003-04-24 AT AT03727214T patent/ATE516954T1/de active

Non-Patent Citations (1)

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