Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F31/00—Inking arrangements or devices
  • B41F31/02—Ducts, containers, supply or metering devices
  • B41F31/027—Ink rail devices for inking ink rollers

Definitions

• the invention relates to a paint chamber doctor blade according to the preamble of claim 1.
• Such ink chamber doctor blade are known for example from German patent application DE 102 55 41 1 A1 and usually associated with a ink transfer roller.
• the ink is usually applied by the ink transfer roller successively to other rollers and ultimately to the substrate.
• flexographic printing is just one more roller, namely the platen, which applies the ink directly to the substrate.
• the ink transfer roller is often an anilox roller, the surface of which is provided with a plurality of small wells of cup shape capable of transporting the ink.
• a doctor blade On the outer surface of the anilox roller is located on a doctor blade, which has the task to remove the color of the surface regions of the ink transfer roller, which have no depressions, and to equalize the color in the wells.
• the ink chamber blade includes a chamber doctor blade extending along the axial direction of the ink transfer roller.
• the chambered doctor blade runs parallel to the axis of rotation of the ink transfer roller.
• Another feature of such a chambered doctor blade body is at least one bearing surface on which the doctor blade described can be placed.
• two provided such bearing surfaces so that two doctor blades can be made to the ink transfer roller.
• the groove-like interior In conjunction with the groove-like interior so creates a closed space that is sealed against the environment, so that in printing operation, even at high printing speed unwanted leakage of the ink from the ink chamber doctor blade is largely avoided.
• the ink chamber doctor blade is usually kept slightly shorter than the ink transfer roller and that the ink chamber doctor blade frontally provided with suitable sealing means, which play no role in the present invention, so that they will not be discussed further.
• contact surfaces for doctor blade and the groove-like interior also extend in the axial direction of the ink transfer roller.
• a clamping device In order to securely and immovably hold a doctor blade on the respective support surface, a clamping device is provided in each case, which usually presses the respective doctor blade on this support surface. This not only fixes the knife, but also effectively prevents a passage of color between the support surface and the doctor blade.
• clamping rails are used in printing machines of the applicant as clamping devices, which are supported on connected to the chambered doctor blade devices. On one side of these devices, the doctor blade is arranged, on the other side a displacement means with which the clamping rail is pressed away from the chamber doctor blade body. This pushing away has the consequence that the clamping rail rests on the doctor blade and this fixed.
• the devices on which the clamping rails are supported may be a plurality of screws that are not completely screwed into the chamber doctor blade body and at the head underside, the clamping rail is supported.
• the doctor chamber body may comprise longitudinal recesses in each of which a wall is undercut, which then has the effect of a hook.
• On the clamping rail is also one arranged undercut bar, which also acts like a hook. Both "hooks" are then engaged, so that pushing away the clamping rail on one side has the pressing of the clamping rail on the other side result.
• the ink chamber doctor blade described are well established in printing technology and have proven themselves very well.
• the leakage of ink is minimal.
• the ink chamber blade constructed in this way can be disassembled quickly and often without tools, so that the replacement of doctor blades, which are subject to wear, and the cleaning of the components can be done quickly and easily.
• the contour of the chambered doctor blade body and / or the clamping rails considered in cross section comprises straight lines, two straight lines each being connected by at least one curved section.
• this straight line is not required, that is, the contour can only comprise curved sections.
• edges which appear as corners in the considered cross-section
• All edges are therefore to be regarded as rounded or rounded.
• the invention is based on the finding that, precisely because of the exposed position of these edges, the corrosion process begins there.
• the individual ones are M eta Ilatome not part of a metal composite, as it occurs within the solid or on a flat solid surface.
• the chemical structure at such exposed sites differs from the structure in the solid state, so that the atoms in these sites react more easily with other atoms or molecules.
• Especially water-based inks react quickly with such, usually only slightly bonded atoms.
• the corrosion that begins here continues.
• the coatings of chambered doctor blade bodies could not change this, as no or very little Be Anlagenungsmatehal permanently sets at the described edges, which effectively protects the metal atoms from contact with the ink.
• the cross-sectional contour of the chambered doctor blade body should be designed according to the invention in order to combat corrosion.
• the chambered doctor blade body and the clamping rail can end up with a surface as before, so that sealing means can be arranged here which bear tightly against this surface.
• Another advantage of the inking chamber blade according to the invention is the easier cleaning. In conventional doctoring chambers, it is particularly difficult to wash ink from inside corners and edges, especially when mechanical means such as brushes or cloths are used. Since, according to the invention, these edges are also rounded, the printing ink can now be removed more easily here.
• the slope of the tangent over the entire edge represents a continuous function.
• the function of the tangent slope remains constant.
• they are the Includes areas that include, for example, the bottom of the paint chamber doctor blade.
• the bottom of the ink chamber doctor blade have areas in which the said function is discontinuous.
• the arc sections arc sections.
• Circular arc sections are characterized by the fact that they can be characterized by a radius.
• Simple arc sections are usually to be described by several radii.
• the arc sections in particular the circular arc sections, have radii of at least 1 mm, preferably of at least 3 mm.
• the effect of the rounding described above is fully effective.
• the chambered doctor blade body and / or the clamping rails are coated.
• This coating is an anti-corrosion coating. Due to the rounded edges, this coating can cover the surfaces extending in the axial direction with a sufficient layer thickness, so that the printing ink is prevented from coming into contact with the material from which said components are made and causing corrosion there can.
• the coating comprises a plastic.
• PTFE polytetrafluoroethylene
• FIG. 1 View of a paint chamber doctor blade and a color transfer roller according to the prior art
• Fig. 2 View Il - Il of Figure 1
• Fig. 3 View of the cross section of an inventive
• FIG. 4 View of the cross section of a chambered doctor blade body of a paint chamber doctor blade according to the invention
• Fig. 5 View of the cross section of a further embodiment of a
• Chamber doctor blade body of a paint chamber doctor blade according to the invention
• FIGs 1 and 2 show two views of a Farbhuntrakel 1 and a Farbübertragungswalze 2 according to the prior art.
• the ink transfer roller 2 is formed in a manner not shown as an anilox roller.
• the ink chamber doctor blade 1 comprises a chambered doctor blade body 3, which of course may consist of several parts.
• the chambered doctor blade body 3 comprises a flat underside 4 and two side surfaces 5, which adjoin the flat underside 5 at an angle.
• the ink transfer roller 2 facing side of the chambered doctor blade body comprises two inclined surfaces 6, which define a groove-like recess 7 between them. Components of the inclined surfaces 6 are the bearing surfaces 8 for the doctor blade 9.
• the doctor blades 9 are employed on the ink transfer roller 2, so that the interior, which through the recess 7, the ink transfer roller 2, the doctor blade 9 and through the end seals, not shown, which also rest against the ink transfer roller 2, is limited, can be filled with paint, without this penetrates to the outside.
• the doctor chamber body 3 extends, as can be seen in Figure 1, parallel to the axis of rotation 10 of the ink transfer roller 2. This parallel direction is also referred to as the axial direction.
• clamping plates 1 1 are provided, which are acted upon by forces, the resultant in the direction of the chambered doctor blade body 3.
• One of these forces, with which the clamping rail is acted upon, is based on the screws 12, which pass through introduced into the clamping rail holes, preferably elongated holes, and are screwed to the chambered doctor blade body 3.
• FIG. 3 shows a paint chamber doctor blade 15 according to the invention, whose chamber doctor blade body 16 is again shown separately in FIG.
• the same parts have been given the same reference numerals.
• the surfaces 4 and 5 are no longer connected by edges (which can be recognized as external corners in the figures), but by curved surfaces which can be seen as arcs in the figures.
• the clamping rails 18 are analogous to that in the ink chamber doctor blade according to the invention Chamber doctor body formed without edges, but provided in the transition areas with curved surfaces.
• the clamping rail is designed somewhat differently than in FIG. 2, wherein the operating principle is not left.
• a striking difference is the displacement of the grooves 18, in which the shafts 24 are inserted, in areas of the lateral outer walls 5.
• the clamping rail 19 is formed angled, wherein the inventive principle of waiving edges was not left.
• Another difference is the absence of the screws to provide a counterforce, which is needed to generate the leverage of the clamping rail 19.
• an axially extending recess 20 is provided, the outer side walls 21 are slightly undercut.
• the clamping rails 19 are provided with webs 22 which engage in the recesses 20 and which are also slightly undercut.
• FIG. 5 shows a further embodiment of the present invention.
• the area between the two bearing surfaces 8 for the doctor blade 9, so the groove-like interior with a further workpiece 25 is designed.
• This workpiece preferably hugs the Surface of the chambered doctor blade body in this area and thus provides a further or improved corrosion protection.
• the workpiece 25 can be fixed and sealed by the doctor blade 9 in the region of the bearing surfaces 8, so that no printing ink can get between the surface of the chamber doctor blade body and the workpiece.
• the workpiece 25 is made of a thermoplastic material.
• the workpiece 25 is at least partially made of polyoxymethylene, which is also known by the abbreviation POM, which not only has a high mechanical strength and rigidity, but also excellent resistance to different chemicals.

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• Inking, Control Or Cleaning Of Printing Machines (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=39739090

Family Applications (1)

Country Status (5)

Families Citing this family (3)

Family Cites Families (12)

• 2007
  • 2007-06-11 DE DE102007027383A patent/DE102007027383A1/de not_active Ceased
• 2008
  • 2008-06-11 ES ES08760819T patent/ES2369316T3/es active Active
  • 2008-06-11 EP EP08760819A patent/EP2158084B1/fr active Active
  • 2008-06-11 AT AT08760819T patent/ATE522356T1/de active
  • 2008-06-11 WO PCT/EP2008/057263 patent/WO2008152050A1/fr active Application Filing

Non-Patent Citations (1)

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