• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Chamber blade for use in a printing machine, for example a flexo printing machine, the chamber blade having a face with a U-shaped channel, the chamber blade being of metal and comprising a surface coating produced by a plasma electrolytic oxidation (PEO) where the surface coating at least covers the U -shaped channel which allows metal to be used to make chamber racks without the risk of decomposition, either due to chemical influences from the colors / varnishes / primers used or as a result of the coating being destroyed by cleaning fluids. The invention further relates to a method of treating the surface of a chamber blade and to use a chamber blade.
    公开号:DK201570066A1
    申请号:DKP201570066
    申请日:2015-02-04
    公开日:2016-08-22
    发明作者:Steffan Ellef Riemandsgaard Warming-Rasmussen
    申请人:Tresu As；
    IPC主号:
    专利说明:

    Area of the invention
    The present invention relates to a chamber blade for use in a printing machine, for example a flexo printing machine, the chamber blade having a front face with a U-shaped channel.
    The invention further relates to a method of treating the surface of a chamber blade and to use a chamber blade.
    BACKGROUND OF THE INVENTION
    Chamber racks are well known for use in rotational flexo printing, which is a printing method which is particularly widespread in the packaging sector. In flexo printing, color is transferred to paper, cardboard, plastic, metal foil or similar printing media by means of a rubber cliche which has a balanced amount of color. The color is transmitted by means of an anilox roller, which is, for example, a metal roller having in its surface a plurality of small holes or cells which are typically 10 - 100 µm deep.
    By varying the number of holes and hole depths, it is possible to vary the amount of color transferred and which is typically 3 - 25 g / m2. To ensure that the holes are only filled to the rim, scrape steel scrapes across the roller. This rocket steel is usually mounted as part of a closed color supply system comprising a chamber. The chamber is constituted by the chamber ratchet having a U-shaped channel, with at each side mounted steel rods which are in contact with the roller and the chamber at its ends is closed by end walls or gaskets.
    The chamber ratchet is generally made of metal, preferably aluminum, because of the mechanical properties desired in connection with lengths of one meter or more where, for example, aluminum can be extruded.
    Stainless steel is also an option, but the material is much more expensive and heavier than, for example, aluminum. Alternatively, chamber rockets can be made of plastic or composite materials. However, these chamber rockets have a limited use due to the mechanical properties of the materials, where the materials are difficult to process and where the material can also settle.
    The choice of material for use with a chamber blade also depends on the colors, primers and varnishes that are desired. Today, for example, colors that are basic and which have caused the problem of corrosion of aluminum chamber racks are used. To remedy this, attempts have been made to coat the chamber rockers, or at least their front surfaces, which are in contact with the aggressive colors, with polytetrafluoroethylene (PTFE).
    However, this has proven to be disadvantageous as polytetrafluoroethylene (PTFE) is only partially pH resistant and thus can be dissolved by certain colors, varnishes and primers. Alternatively, metal can be coated by nickel plating or chrome plating. However, this is difficult if not impossible, especially when the chamber ratchet is of aluminum.
    The chamber groove and the surface coating must also be resistant to cleaning fluids, for example, ethanol can also dissolve polytetrafluoroethylene (PTFE).
    For example, primers known as white / transparent granules are known to be poured into water and dissolved herein by adding ammonia (NFE) which is converted to ammonium ions (NH 4 +). This raises the pH to approx. 8.2, whereby the solution becomes gritty and gel-like, and foams are formed which fill 30-40% of the volume of the primer. To remove the foam again, the pH is raised further to 8.5-9.0. This high pH then instead causes problems with the surface coating of, for example, polytetrafluoroethylene (PTFE) and thus also with the chamber crack.
    Particularly, there are problems when the materials passing through the printing machine get a complete surface coating of, for example, primer, the cups in the roller being thereby emptied and containing air which, for example, is transferred to the primer and thus forms foam.
    When, for example, a primer solidifies, it entails a necessary purification process, where cleaning fluids having higher pH values are used than the primers used, for example, cleaning fluids with pH values of 9-11, which, in turn, release the solidified primer, but which on the other hand, it also destroys the chamber coating surface.
    Despite the widespread use of chamber rockets, to date there has been no possibility of providing chamber rockets with such good mechanical properties and with a coating that is so good as to be resistant to the chemical influences of the present colors / varnishes / primers and also resistant to the necessary cleaning fluids / detergents.
    The object of the invention
    It is the object of the present invention to provide a solution to these problems in a manner that allows the use of metals to produce chamber bars without the risk of decomposition, either due to chemical effects from the colors / varnishes / primers used. or as a result of the surface coating being destroyed by cleaning fluids.
    It is a further object to provide a solution which is economically viable so that there is no economic reason for maintaining the known solutions where mechanical scraping is necessary, in contrast to the possibilities described herein where cleaning of the primary -shaped channel can be provided with a brush and a detergent having a suitable pH.
    Description of the Invention
    According to a first aspect of the invention, the above-mentioned object is achieved with a chamber rack as initially described and as described in the preamble of claim 1, wherein the chamber rack is of metal and comprises a surface coating produced by a plasma electrolytic oxidation (PEO), wherein the coating at least covers the U-shaped channel.
    By metal is meant the metallic elements and their alloys, and thus metal also includes light metals. By light metal is meant metals and alloys having substantially lower density than steel, such as, for example, aluminum, magnesium, titanium and their alloys.
    This allows the use of Plasma Electrolytic Oxidation (PEO), which is an electrochemical surface treatment which produces a surface coating in which metal is transformed into ceramics by passing a pulsed, bipolar electric current in a precisely controlled waveform through a bath of dilute aqueous electrolyte. , whereby millions of microscopic, lightning-like discharges of plasma are formed on the surface of the metal, gradually transforming the surface into a hard, dense layer of crystalline oxide-based ceramics that is extremely resistant to corrosion and wear.
    In the PEO process, the emission can be controlled for millisecond durations, where currents on milliamps are used to initiate micrometer-sized plasma reactors that mix surface material with electrolytes. This allows the ceramic surface layers to be adapted to wear resistance, corrosion protection and thermal protection.
    The PEO process can thus make the surface of a chamber blade both harder and more durable than steel and glass, and is also about twice as strong as hair anodizing. In addition, the surface of the chamber groove is corrosion protected with the PEO process.
    In another aspect, the present invention also relates to the chamber ratchet being made of aluminum. Where aluminum is commonly used and suitable for extrusion, the limiting factor for the use of aluminum has been its soft surface and lack of abrasion resistance. With the PEO process, which transforms the surface into a hard and dense layer of ceramic that not only has a high abrasion resistance but also protects against corrosion, aluminum is also suitable for applications where abrasion resistance and corrosion protection are required.
    An alternative to aluminum is magnesium, which is also suitable for extrusion, but where the limiting factor for the use of magnesium has been the price, production capacity, corrosion protection, durability and durability.
    With the PEO process, these problems are solved as previously mentioned with a hard and dense layer of ceramic, which not only has a high abrasion resistance, but which also protects against corrosion, so that these factors are no longer limiting the use of magnesium.
    The present invention also relates, in a third aspect, to a chamber rack in which the surface coating has a thickness of between 5 and 50 µm, but preferably between 10 and 20 µm, where the thickness can be adjusted, adjusted according to need and need. The outer surfaces of the chamber rattle are porous (lunar-landscape-like) after the PEO process and therefore suitable for further surface coating.
    As an alternative to the additional coating, the surface can be polished.
    The present invention also relates, in a fourth aspect, to a chamber barrel, wherein said surface coating covers the entire chamber barrel, which is probably also most often the case, as it is quickest, easiest and cheapest to immerse the chamber barrel in a bath with the aqueous electrolyte.
    The present invention also relates, in a fifth aspect, to a chamber rocker, the chamber rock further comprising a slippery ceramic surface coating which at least covers the U-shaped channel.
    With a ceramic coating, significant improvements can be made to tribological problems such as wear, friction, corrosion, slip and maintenance. For example, a ceramic coating can be obtained by processes such as PVD, PACVD, CVD and ion implantation.
    This makes it possible to avoid polishing the chamber groove after the PEO process, as the surface coating binds nicely to the porous surface structure. In addition, the surface coating provides good abrasion properties due to high hardness, good corrosion properties, the surface coating being basically a glass that is ductile and can withstand shock without breaking. In addition, the coating can contain a color and can withstand cleaning fluids, such as ethanol without being dissolved.
    The present invention also relates, in a sixth aspect, to a chamber rack in which the ceramic coating has a thickness of between 30 and 50 microns, but preferably between 20 and 30 microns, where the thickness can be adjusted and adjusted to suit and need. The outer surfaces of the chamber groove, after the coating, are hard, tough and very durable.
    The present invention also relates, in a seventh aspect, to a chamber barrel, wherein the ceramic coating covers the entire chamber surface, which is likely to be the case with this surface coating as it is quickest, easiest and cheapest to spray, spray and apply the surface coating over the entire chamber surface. thus avoiding time-consuming hedges.
    The present invention also relates, in an eighth aspect, to a method of treating the surface of a chamber rocker, the method comprising at least the following steps: A: The chamber rocker is placed in an aqueous electrolyte and B: A pulsating bipolar electric current in a precisely controlled waveform is passed through the electrolyte.
    This makes it possible to apply a coating to at least parts of the chamber ratchet and preferably the entire chamber ratchet as the aqueous electrolyte enters all corners and hooks of the chamber ratchet.
    The present invention also relates in a ninth aspect to a method for treating the surface of a chamber blade, the method further comprising at least the following steps: C: A surface coating is applied to the surface of the chamber blade and D: The surface coating is cured at 250 ° C.
    This allows the surface coating to be applied preferably by spraying it on at least parts of the chamber rack surface or the entire chamber barrel surface, after which the chamber barrel is placed in an oven at 250 ° C where the coating cures.
    The present invention also relates in a tenth aspect to the use of a chamber rocker for use in a printing machine, for example in a flexo printing machine.
    drawing Description
    The invention will now be explained in more detail by describing non-limiting embodiments with reference to the drawings, in which:
    FIG. 1 shows a schematic section through a chamber rack
    Reference List 1 Chamber Rack 2 Front 3 U-shaped Channel 4 Chamber 5 Rack Steel 6 Pressure Roll 7 Plasma Electrolytic Oxidation 8 Surface Coating
    DETAILED DESCRIPTION OF THE INVENTION In Figure 1, it is seen that the chamber rake 1 has a face 2 in which a U-shaped channel 3 is formed. This U-shaped channel 3 forms part of a chamber 4 which is further defined by rake steel 5. which is located at each side of the U-shaped channel 3 as well as by a pressure roller 6. The bounded chamber 4 is used for the primer, color or varnish used.
    The chamber ratchet 1 has a surface which has undergone a plasma electrolytic oxidation 7 which at least covers the U-shaped channel 3, but which in the illustrated embodiment extends over the entire front side of the chamber rack 2.
    The chamber groove 1 may have a surface which additionally has a surface covering 8 which at least covers the U-shaped channel 3, but which in the illustrated embodiment also extends over the entire front side of the chamber groove 2.
    权利要求:
    Claims (10)
    [1]
    A chamber blade for use in a printing machine, for example a flexo printing machine, wherein the chamber blade has a front face with a U-shaped channel, characterized in that the chamber blade is of metal and comprises a surface coating produced by a plasma electrolytic oxidation (PEO), wherein the coating at least covers the U-shaped channel.
    [2]
    Chamber chamber according to claim 1, characterized in that the chamber chamber is made of aluminum.
    [3]
    Chamber blade according to any one of claims 1 to 2, characterized in that the surface coating has a thickness of between 5 and 50 µm.
    [4]
    Chamber blade according to any one of claims 1 to 3, characterized in that said surface coating covers the whole chamber blade.
    [5]
    Chamber rack according to any one of claims 1 to 4, characterized in that the chamber rack further comprises a non-slip ceramic surface covering which at least covers the U-shaped channel.
    [6]
    Chamber roil according to claim 5, characterized in that the ceramic coating has a thickness of between 30 and 50 µm.
    [7]
    Chamber blade according to any one of claims 5 to 6, characterized in that the ceramic coating covers the entire chamber blade surface.
    [8]
    Method for surface treatment of a chamber doctor according to claims 1 to 7 for use in a printing machine, for example a flexo printing machine, characterized in that the method comprises at least the following steps: A: The chamber doctor is placed in an aqueous electrolyte and B: a pulsating bipolar electric current in a precisely controlled waveform is passed through the electrolyte.
    [9]
    Method for surface treatment of a chamber blade according to claim 8, characterized in that the method further comprises at least the following steps: C: A surface coating is applied to the surface of the chamber blade and D: The surface coating is cured at 250 ° C.
    [10]
    Use of a chamber rotor according to claims 1 to 7 for use in a printing machine, for example a flexo printing machine.
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    CN105899099A|2014-01-21|2016-08-24|惠普发展公司，有限责任合伙企业|Device casing including layered metals|
    法律状态:
    2020-09-14| PBP| Patent lapsed|Effective date: 20200204 |
    优先权:
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    DKPA201570066A|DK178658B1|2015-02-04|2015-02-04|chamber Rachel|DKPA201570066A| DK178658B1|2015-02-04|2015-02-04|chamber Rachel|
    JP2017538333A| JP2018512296A|2015-02-04|2016-02-03|Doctor beam|
    EP16746158.1A| EP3253577A4|2015-02-04|2016-02-03|Doctor beam|
    US15/548,435| US20180022083A1|2015-02-04|2016-02-03|Doctor Beam|
    CN201680006631.1A| CN107206783A|2015-02-04|2016-02-03|Wiping beam|
    PCT/DK2016/050030| WO2016124205A1|2015-02-04|2016-02-03|Doctor beam|
    IL253074A| IL253074D0|2015-02-04|2017-06-21|Doctor beam|
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