MXPA98010750A - Method for high-speed metalized scrapping coating to produce abrasion-resistant press plates, coated with reduced accumulated thermal effort - Google Patents

Abstract

The present invention relates to a method for making a flat pressing surface to produce decorative laminate from paper impregnated with resin, with alumina particles on its pressing surface, it is coated with diborides selected from the group consisting of diboride hafnium, molybdenum diboride, tantalum diboride, tungsten titanium diboride, vanadium diboride, or zirconium diboride or mixtures thereof to make the press board resistant to scratching using a process wherein the press plate and the Metallic heads move one relative to the other to provide a sufficient sweep rate to give a thermal gradient in the press plate of 10 ° C or less, to provide reduced accumulation voltage and more misplaced heat distribution throughout the entire pre-plate

Description

METHOD FOR HIGH-SPEED METALIZED SCRAPPING COATING TO PRODUCE PRESS PLATES RESISTANT TO ABRASION, COATED WITH REDUCED ACCUMULATED THERMAL EFFORT BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to abrasion-resistant press plates, coatings used in the manufacture of abrasion-resistant decorative laminate, to the coating of press plates and to lamination processing with those press plates.

Description of the Background: In the manufacture of decorative laminate, the impregnated resin paper layers are pressed against the press plates under conditions of temperature and pressure to cure the resin and bond the layers. A high gloss press plate imparts a high gloss surface for lamination. A textured surface imparts a textured surface for laminate. These press plates are extremely uniform, with microscopic discontinuities that are reduced to a minimum. The quality of a high gloss polished press plate can be determined by viewing the images reflected on its surface and scanning the reflected images for optical discrepancies. Sanding the surface of the laminate causes micro scratching of the stainless steel press plates normally used in the manufacture of decorative laminate, thereby destroying the micro finish of the press plates. The press plates can also be scratched by the press plate handling equipment and by the debris from the pressing equipment or the materials used in making the laminate (Laurence U.S. Patent 5, 244, 375). The decorative laminate coated with melamine resin is pressed at temperatures of about 10-155 ° C and pressures of about 20-136 bar and preferably about 51-10 bar. Heating to these temperatures and cooling to room temperature results in the substantial expansion and contraction of the laminate and the press plate. The expansion and contraction of the laminate and the press plate will not be the mass, resulting in the movement of the sand on the pressing surface of the laminate through the press plate. It is described in National Electrical Manufacturers Association (N EMA) Standards Publication No. LD 3, that the gloss finish laminate has a brightness of 70-100 +. It is described that the high gloss textured finish laminate has a brightness of 21 -40. Black glass with a brightness of 94"1 g, measured at a 60 degree angle, is described in the NEMA Standard 3.13.2, to calibrate a brightness meter for 60 degree angle brightness measurements. discontinuities in high-gloss press plates that can be seen only with a microscope can impart visible surface defects to a high-gloss laminate surface Any scratching of high-gloss press plates imparts visible surface defects to the surfaces of high gloss of the laminate and reduces the level of gloss.Sanding the decorative surface of the laminate imparts resistance to abrasion, a commercially desirable feature of the laminate.The alumina particles are commonly used as a sand in the elaboration of the decorative laminate. of Vickers of alumina is described in "Triboiogy Friction and Wear of Engineering Materials", IM Hutchings, CRC Press, 1992, to be 18 00 to 2000. A useful scale of particle sizes is from about 10 to about 75 microns. Sand of about 25-60 microns is preferred. The abrasion resistance is obtained in the particle size scale of approximately 40 to 60 microns. (Lañe et al., United States Patent 3,798,111).

Alumina having a maximum particle size of 9 microns is described as being effective in imparting a surface of wear resistance to the glossy decorative laminate. Wear resistance is defined as the resistance of a glossy laminate to losing gloss when the surface of the laminate is exposed to the abrasive effects of sliding objects. It is recognized that the resulting laminate does not meet the requirements N EMA LD 3.01 to be considered as resistant to abrasion. Nevertheless, it is disclosed that glossy press plates are not substantially extended if the particle size of sand is maintained at less than 9 microns (Lex et al., U.S. Patent 4,971, 855). The use of a 410 stainless steel press plate hardened by nitriding is described to make a high gloss decorative laminate. After pressing 100 sheets of high-gloss laminate with 6-micron and 15-micron sand, the brightness of the pressed laminate was maintained from good to very good. The nitrated press plate exposed to 6 micron sand was repulsed after 234 cycles and produced an acceptable laminate quality of at least another 103 cycles. Nitrated press plates exposed to 30 micron sand offered limited duration. It is disclosed that the 410 stainless steel press plate used for nitriding had a Rockwell "C" scale hardness of 38-45 and that of the nitrated surface had a Rockwell "C" hardness of 60-70. The equivalent Vickers hardness of stainless steel is approximately 370-440, based on a conversion table published in "Metals Handbook, Mechanical Testing", Vol. 8, 9a. Edition, ASM 1985. The Vickers hardness equivalent of stainless steel 410 nitrated is approximately 500-1000, based on a conversion table published in "Metals H andbook, Mechanical Testing", Vol. 8, 9a. Edition, ASM 1985. (Laurence, United States Patent 5,244,375). The laminate with alumina of average particle size of 35 microns on its surface (PGA layer 822, commercially available from Mead Corporation) has been pressed with high gloss press plates coated with titanium nitride. After ten pressings, the press plates coated with titanium nitride had about 15 stripes per square centimeter. A control 410 stainless steel press plate had approximately 500 stripes per square centimeter. Vickers hardness of titanium nitride is described in "Tribology: Friction and wear of Engineering Materials", I. M. Hutchings, CRC Press, 1992, to be from 1200 to 2000. The control press plate and the press plate on which the titanium nitride was coated were cut from the stainless steel press plate. The stripes were visible under a light microscope at a magnification of 40X. The titanium nitride was coated on 410 high-gloss stainless steel press plates in a magnetron metallized coating system. The use of a magnetron metallized coating system to apply a titanium nitride coating is described in "Multi-Cathode U nbalanced Magnetron Sputtering Systems", Sproul, surface and coating Technology, 49 (1991). The use of a titanium metallized coating system to clean the surface to be coated is described in "A New Sputter Cleaning System for Metallic Substrates", Schiller et al., Thin Solids Films, 33 (1976). Additionally, the color of the laminate pressed with the press plate coated with titanium nitride was different from the color of the pressed laminate with the control press plate.A color difference ASTM 2244 compared to a standard of less than (" 0.5) E is considered as an acceptable color match to the standard. The ASTM 2244 color difference between a standard and a pressed laminate with the press plate coated with titanium nitride was greater than greater than (0.5) E. The press plate coated with titanium nitride and the laminate pressed therefrom had a bronze appearance. The control press plate and the laminate pressed therefrom did not appear bronze. The laminate pressed with the control press plate had an ASTM D 2244 color difference when compared to the standard of less than (0.5) E. The iron-based cutting tools have been coated with metallized with titanium diboride. The metallization is carried out in an accelerated argon or krypton ion beam at 1300-1800 volts as a broad ion beam source. The target of titanium diboride is placed as a cathode. The tool is heated to approximately 200 ° C. The plating is done under vacuum of approximately 4-6 milli-Torr. The titanium diboride had an extremely high microhardness value of Vickers, typically around 3600, which is not only considerably higher than other borides but substantially higher also than other carbides or nitrides. Titanium diboride is also particularly notable for its high density, for example, 88% theoretical density, a low resistivity of 30 micro-ohms centimeters, a high strength of approximately 2812 kg / cm2 and a coefficient of thermal expansion that is approximately 8.1 x 10-6 on the temperature scale of 20E-800EC (68-1472EF). (Moskowitz et al., U.S. Patent No. 4, 820, 392). Control conditions for metallic coating are described in I nfluence of Apparatus Geometry and Deposition Conditions on the Structure and Topography of Thick Sputtered Coatings Thornton, Jornal of Vacuum Science Technology, Volume 1 1, Number 4, (J ulio / August 1974) and Sputtering, Thornton et al. , Metal Handbook, Ninth Edition American Society for Metals, Metals Park, Ohio, 44073, Volume 5, pp 412-416, (1982). There is a need for a hard coating on press plates, web and other pressing surfaces that impart a color to the laminate having an ASTM D 2244 color difference compared to a standard of less than (".5) E. The need for a coating that can be applied to a pressing surface without changing the appearance of the finish on the pressing surface There is a need for a pressing surface that is not scratched when used in laminate pressing coated with aluminum particles. There is a particular need for a pressing surface that is not scratched when used in the pressing of high-gloss laminate with an ASTM D 2457 angle gloss of 60 degrees. greater than 70, when the surface of the laminate is covered with particles of at least 25-60 meters.

BRIEF DESCRIPTION OF THE NONDION It is therefore an object of the present invention to provide a method for coating a press plate that provides a superior protective hard coating and that has a more misplaced heat distribution through the plate. A further object of the present invention is to provide a coated press plate and method for its manufacture that overcomes the aforementioned disadvantages in the art. These and other objects of the present invention have been met by the discovery of a method of manufacturing a flat pressing surface to produce the decorative laminate from paper impregnated with resin, comprising: imparting a desired finish on a pressing surface flat remove contaminants from the flat surface; and coating the flat surface with diborides selected from the group consisting of hafnium diboride, molybdenum diboride, tantalum diboride, titanium diboride, tungsten diboride, vanadium diboride, or zirconium diboride or mixtures thereof in a Flat magnetron plating coating system for a Vickers hardness of at least 2000, wherein the coating step is executed causing the flat surface and a metallized head of the flat magnetron plating coating system to move in relation one with another at a scanning metalizing rate to provide a thermal gradient on the flat pressing surface of 10 ° C or less.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES The present invention relates to an improved method for the production of a coated press plate, particularly a press plate coated with diboride. It has been found that the color, gloss and surface appearance of the laminate made with pressed surfaces coated with diborides selected from the group consisting of hafnium diboride, molybdenum diboride, tantalum diboride, titanium diboride, tungsten diboride, diboride. of vanadium, or zirconium diboride or mixtures thereof are substantially the same as the color and gloss of the laminate made with the pressing surfaces before the coating is applied. Preferred diborides for coating laminate pressing surfaces are titanium diboride or zirconium diboride. The most preferred diboride for coating laminate pressing surfaces is titanium diboride. It is considered that titanium diboride is more commonly used commercially for coating surfaces than other members of the diborides of this invention because they can be coated by metallization in a magnetron plating system on a larger scale of deposition. In Grig et al, the alumina particles on the pressing surface of the abrasion-resistant decorative laminate can scratch the press plates and reduce the visual quality of the laminate subsequently made with the press plate. The pressing plates of this invention are particularly useful in the manufacture of the high gloss decorative laminate resistant to abrasion. The diboride coating of this invention can be applied to the laminate pressing surfaces to have a Vickers hardness of at least 2000 and preferably at least 2200, sufficient to press the laminate with alumina particles of 25-60 microns. larger in the pressing surface of the laminate without being scratched. A coating of about 3 microns has sufficient hardness to resist scratching of the alumina particles on the pressing surface of the laminate. The hardness of the coating can be controlled in a flat magnetron plating coating system by those experienced in the use of those systems. It has been found that the diboride coating of this invention it can be coated on a pressing surface with sufficient bond strength for use in high pressure pressing lamination. A bond strength of 1.6 and preferably 1.8 kilograms force (kgf) determined by the diamond scratch bond test is considered sufficient. Diboride coatings of more than 6 microns may have lower bond strengths due to the stresses produced during coating. The bonding of the diboride coating of this invention to the pressing surface is improved by thorough cleaning of the pressing surface before introducing the pressing surface into a magnetron plating coating system. The bonding is further improved by etching the pressing surface with the magnetron plating coating system before applying the titanium diboride coating. Cleaning, anodic etching, cathodic etching and radio frequency (RF) engraving can be achieved by methods known to those experienced in the use of a magnetron plating coating system. It has been found that a titanium filler applied directly to the pressing surface before applying the diboride coating of this invention further improves the bonding of the diboride. The improvement of the bond by cleaning, etching and the use of an intermediate layer between the coating and the substrate is known to those skilled in the art of the use of magnetron plating coating systems. The coating of the press plates according to the present invention can be executed either in a stationary mode or in a sweeping mode. In the stationary mode, the magnetron plating is executed with the metallized head and the stationary press plate. However, it has been found that plating in a stationary mode provides Vickers micro hardness (HV) values of only about 1000. A preferred method for coating the press platen of the present invention is to execute the coating process in a sweeping mode, either by moving the press plate while the metallized head is held stationary or by moving the metallized head while holding the stationary press plate. The preferred mode for the sweeping process is by moving the plating head. When the sweeping process is used, the inventors of the present have found that the resulting coated press plate has much higher HV values (>2000) in similar film thicknesses. In addition, when the sweeping process is used, the resulting film has increased adhesion, in the order of 1.6 grams or more. A disadvantage with the process of sweeping in a large production size vacuum coater for press plates of 10.16 x 20.32 cm, is that although the properties of the film are similar to the small scale coaters at speeds of 5.08 cm / minute , the press plate experiences warping due to high thermal gradients (in the order of 37.7 ° C and higher) induced in the press plate during the process. It has been found that the thermal gradient induced in the plate can be reduced by an order of magnitude or more by increasing the scanning speed of a plate of 10.16 x 20.32 cm, at a speed at a speed of 121.92 cm / minute to 406.4cm / min, preferably from 127 cm / minute to 254 cm / minute, more preferably from 1 39.7 cm / minute to 223.52 cm. Within the context of the present invention, the sweep speeds are given in linear centimeters per minute along the sweep direction, with a plating head reaching completely through the short direction of the press plate, typically 10.16 cm in a production line. However, other scanning methods with smaller metallization heads are also possible. Such metallized heads would be operated at similar linear speeds, although they would require multiple passes to provide a single full coat layer. In addition, the reduction in thermal gradient can be achieved while surprisingly retaining the same film properties in the coated plate. The modeling studies of the inventors of the present invention demonstrate that the thermal gradient can be reduced from 150 ° C to 20.32 cm / minute to below -10.5 ° C to 406.4 cm / min. This reduction in the thermal gradient has been confirmed experimentally by producing a coated press plate at scanning speeds of 200.66 cm / minute and 88.9 cm / minute, giving thermal gradients of -17.7 ° C (or negligible) and approximately - 12.7 ° C, respectively. This ability to reduce the thermal gradient and therefore provide a more misplaced heat distribution across the entire plate is critical due to the accumulated stress and a limited maximum temperature for the press plate are impractical limitations that must be considered in any process of production scale. The thermal gradient in the present high-speed sweeping process is 10 ° C or less, preferably 1.6 ° C or less, more preferably -3.8 ° C or less, more preferably -9.4 ° C or less.

EXAMPLES The high-pressure, high-gloss, black laminate was pressed with the press plates coated with titanium diboride shown in Table 1. These press plates have been finished to impart an ASTM D 2457 angle gloss of approximately 60 degrees to the laminate before being coated with titanium diboride. The ASTM D 2244 color difference between standard and laminated pressing with the press plates coated with titanium diboride shown in Table 1 was less than (0.5)? E. The differences in color and brightness in table 1 are averages of measurements made in 10 laminates.

Table 1 Color and Glitter Differences ASTM Glitter Press Plate @ 60 ° Color Difference ASTM.?E 3000-1 101 0.20 3000-2 100 0.25 6000-1 101 0.35 6000-2 103 0.40 6000-3 102 0.30 6000-4 102 0.40 6000-5 103 0.45 6000-6 101 0.45 Additionally, the 3000-2 high-gloss Press Plate and a control press plate has been used in the pressing of 760 sheets of high-gloss, black, high-pressure laminate, with alumina particles of average particle size. 35 microns on its pressing surface. The laminate was pressed with these pressing plates at approximately 68 bar and 137 ° C. The pressing surface of the laminate is the commercially available cover sheet with 35 micron alumina sand (PGA 822 from Mead). The Press Plate 3000-2 and the control press plate was cut from a high gloss 410 press plate that has been finished to impart an ASTM D 2457 angle brightness of about 60 degrees for the laminate . Press Plate 3000-2 and press plate measurement approximately 30.48 along one side and 27.94 cm along the other side. Press Plate 3000-2 was coated with approximately 5 microns of titanium diboride in a magnetron plating coating system. The coating of titanium diboride was applied in 17 scans, applying approximately 3000 angstroms of titanium diboride per scan. The other was used as a control. The first sheet of high gloss, black laminate with alumina particles of average particle size of 35 microns on its pressing surface had an ASTM D 2244 color difference compared to a standard of approximately (0.25)? E. The first sheet of high gloss, black laminate was pressed with the Press Plate 3000-2 had an ASTM D 2244 color difference compared to a standard of approximately (0.1 5)? E. The first high gloss black laminate sheet pressed with the control press plate had an ASTM D 2457 angle gloss of 60 degrees of about 100 for the laminate. Sheet 760a of the black laminate pressed with the control press plate had an ASTM D 2457 angle brightness of 60 degrees of less than 70. The control press plate imparted an angle brightness of 60 degrees of less than 90 for the black laminate after approximately 160 sheets had been pressed. It was considered that such a laminate with a 60 degree angle brightness of less than 90 is not commercially acceptable as a high gloss laminate. Those 760 sheets of black laminate pressed with Press Plate 3000-2 had an ASTM D 2457 brightness of 60 degrees of about 100. Press Plate 3000-2 had been viewed under a microscope for scratches after pressing those 760 sheets of black laminate and none had been found. The control press plate is very grated. No differences were observed in the surface appearance of the pressed laminate with the Press Plates shown in Table 1 and the control press plates. The titanium diboride was coated on the high gloss press plate in a magnetron plating coating system under a number of conditions. It is also considered that a coating of at least 3 microns is necessary to achieve a Vickers hardness of at least 2000 and that adhesion decreases in coating thicknesses of 6 microns or more. Hardness and adhesion can be controlled, as those skilled in the art know, by means of the pressure and the temperature under which the press plates are coated with the diborides of this invention and the energy (amperes and volts) used in the coating of the diborides of this invention on the press plates. A textured press plate coated with titanium diboride, hereinafter "Press Plate 3000-3", and a control press plate are used in the pressing of more than 450 sheets of textured, black, high-pressure laminate with alumina particles of average particle size of 35 microns on their pressing surface. This laminate was pressed at approximately 68 bar and 138 ° C. The Press Plate 3000-3 and the control press plate were cut from a 630 stainless steel press plate that had been finished to impart an ASTM D 2457 angle brightness of about 60 degrees to the laminate. The 3000-3 Press Plate and the control press plate were coated with approximately 6 microns of titanium diboride in a magnetron plating coating system. The coating of titanium diboride was applied in 20 scans, applying approximately 3000 angstroms of titanium diboride per scan. The first sheet of this black textured laminate pressed with the control press plate had an ASTM D 2244 color difference compared to a standard of approximately (0.22)? E. The high gloss, black laminate pressed with the Press Plate 3000-3 had an ASTM D 2244 color difference compared to a standard of approximately (0.08)? E. The first sheet of this black laminate pressed with the control press plate had an ASTM D 2457 angle brightness of 60 degrees of about 9.5. the sheet 450a of this black laminate pressed with the control plate had an ASTM D 2457 angle brightness of about 60 degrees. This black laminate pressed with the Press Plate 3000-3 had an ASTM D 2457 angle brightness of 60 grades of about 10. No differences in the surface appearance of the pressed laminate were seen with Press Plate 3000-3 and a control press plate. The press plates in I Table 1 and Press Plate 3000-3 were cleaned and then etched under radiofrequency conditions in a flat magnetron plating coating system. These press plates were coated with titanium diboride in the magnetron plating coating system under the following averaged conditions.

Cleaning Cleaning chemical cleaning with ethanol, trichloroethane and acetone Physical cleaning 5 minutes of blowing nitrogen gas on the press plate Radio Frequency Etching Conditions Argon Gas Average Scanning Speed (cm / minute) 2.54 mTorr 10 mA / cm2 .54 kV .75 Coating Conditions of Titanium Diboride medium argon gas cm / minute 2.54 mTorr 7 mA / cm2 13 kV .3 Coating Conditions and Properties 1 miera = 10, 000 units Three high gloss press plates, measuring approximately 1.21 m by 2.43 m, of this invention have been made. These press plates are referred to as Press Plates 3-1, 3-2 and 3-3. Those plates were coated with metallized with titanium diboride under conditions of flat magnetron discharge. Press Plates 3-1, 3-1 and 3-3 were anodically etched and then coated with titanium and titanium boride in a flat magnetron plating coating system under the following averaged conditions. Those plates were clinically cleaned before they were placed inside the coating system. The temperature of these press plates during engraving and coating was approximately 149 ° C. Those press plates do not warp at this temperature.

Cleaning (Press Plates 3-1, 3-2 and 3-3) Chemical cleaning clean with ethanol, trichloroethane and acetone Anodic Engraving Conditions (Press Plates 3-1 3-2 3-3) Argon Argon I Argon Argon Gas Speed (cm / minute) 7.6 7.6 7.6 mTorr 25 24 1 0 mA / cm2 .72 .45 .45 kV .24 .23 .24 number of sweeps 1 1 5 Titanium Coating Conditions (Press Plates 3 ^ 1 3 ^ 2 3-3 argon gas argon argon argon cm / minute 7.6 7.6 7.6 mTorr 1 .6 1 .2 2.7 mA / cm2 1 1 1 1 1 1 kV .52 .52 .43 number of sweeps Ti 1 1 1 Coating Conditions of Titanium Diboride (Press Plates 3_ ¡3-2 3-3 argon gas argon argon argon cm / minute 7.6 7.6 7.6 mTorr 1 .6 1.2 2.7 mA / cm2 1 1 12 11 kV .52 .60 .50 number of sweeps TiB2 8 12 18 velocity of deposition (- / sweeping) 4125 5500 3000 Properties of TiB? / Ti (Press Plates 3-1 3-2 3-3) Thickness (microns) 3.3 6.6 5.4 Adhesion (kgf) * 1.2 * ** Hardness (kgf) 2000 2500 ** * The coating of TiB2 / Ti separated from Press Plates 3-1 and 3-2 during the pressing of the laminate. ** The hardness and adhesion of Press Plate 3-3 have not been measured. Hardness and adhesion tests destroy the surface of a press plate. Press Plate 3-3 has been used in the pressing of more than 1200 sheets of high gloss, black, high pressure laminate with alumina particles of average particle size with 35 microns on their pressing surfaces. Press Plates 3-3 were checked for scratches after pressing 1200 sheets of laminate and had not been found. The coating of titanium diboride on Press Plates 3-1 and 3-2, separated from the stainless steel substrate after pressing less than 100 sheets of laminate. A high gloss press plate coated with zirconium diboride of this invention and a control press plate have each been used in the pressing of 10 sheets of high gloss, black laminate. This laminate had an ASTM D 2244 color difference compared to a standard of approximately (0.26)? E and an angle brightness of 60 degrees, ASTM D2457 of approximately 100. No differences in the surface appearance of the pressed laminate were observed with the press plates coated with zirconium and the control plates.

A high gloss press plate coated with zirconium diboride of this invention has been used in the pressing of 10 sheets of high gloss, black laminate with alumina particles with an average particle size of 35 microns on its pressing surface. This laminate was pressed at approximately 68 bar and 138 ° C. A cover sheet commercially available with 35 micron alumina sand (PGA 822 from Mead) is the pressing surface of the laminate. No scratches were observed on this press plate after the pressing of 10 sheets of laminate. The press plate with zirconium diboride was cut from a 410 stainless steel press plate, high gloss having an ASTM D 2457, which had been finished to impart an angle brightness of about 60 degrees to the laminate. Two press plates measuring approximately 30.48 cm along each side were cut from this press plate. One was coated with approximately five microns of zirconium diboride in a flat magnetron coating system. This press plate was recorded under radio frequency conditions for approximately 15 minutes before the coating of titanium diboride was applied. A coating of titanium diboride was applied in 15 scans, applying approximately 4000 angstroms of zirconium diboride by scanning in a flat magnetron coating system under the following averaged conditions.

Cleaning chemical cleaning cleaned with ethanol, trichloroethane and acetone physical cleaning 5 minutes of blowing nitrogen gas on the press plate Engraving Conditions of Radio Frequency Argon gas mean sweep speed (cm / minute) 2.54 mTorr 10 mA / cm2 .54 kV .75 Coating Conditions of Zirconium Diboride medium argon gas cm / minute 2.54 mTorr 7 mA / cm2 9 kV .4 The black laminate has been pressed with press plates, measuring 15.24 x 15.24 cm, coated with titanium nitride in a system of magnetron metallic coating. The test results shown in table 3 are the average results of the pressing of five sheets of laminate with each press plate.

Table 4 Pressed Laminate with Press Plates Coated with Titanium Nitride Control # 8 TiN # 8 control # 9 TiN # 9 ASTM Glitter @ 60 ° 100 95 100 95 Color Difference ASTM? E 0.30 0.75 0.35 0.90 The brightness of the pressed laminate with the press plate coated with titanium nitride was less than the brightness of the laminate pressed with the control press plate. The color of the laminate pressed with the titanium nitride press plate was significantly different from the color of the pressed laminate with the uncoated control press plate. The press plates coated with titanium nitride and the laminate pressed with the press plates with titanium nitride had a bronze appearance. The black laminate has been pressed with press plates, measuring 1 5.24 x 15.24 cm, coated with niobium nitride in a magnetron plating coating system. The test results shown in Table 4 are the average results of the pressing of five sheets of laminate with each press plate.

Table 5 Pressed Laminate with Press Plates Coated with Niobium Nitride Control # 8 TiN # 8 Control # 9 Gloss ASTM @ 60 ° 106 102 101 Color Difference ASTM? E 0.09 0.65 0.85 The gloss of the pressed laminate with the press plates coated with niobium nitride was less than the brightness of the laminate pressed with the press plate before it was coated. The color of the laminate pressed with the press plates coated with niobium nitride was significantly different from the laminate pressed with the press plates before they were coated. The black laminate had been pressed with press plates, measuring 15.24 x 15.24 cm, coated with diamond-like coating in a magnetron plating coating system. The laminate stacked to the press plate with diamond-like coating and was destroyed when they were separated. While the illustrative embodiments of the invention have been described with particularity, it will be understood that various other modifications will be apparent to and can be readily made by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is not intended that the scope of the claims appended hereto be limited by the examples and descriptions set forth herein but that the claims are considered to encompass all of the features of patentable novelty that reside in the present invention, including all the characteristics that would be treated as equivalents thereof by those with experience in the art to which this invention belongs.

Claims (14)

1. CLAIMS 1 . A method for making a flat pressing surface for producing decorative laminate from paper impregnated with resin, comprising: imparting a desired finish on a flat pressing surface; remove contaminants from the flat surface; and coating the flat surface with diborides selected from the group consisting of hafnium diboride, molybdenum diboride, tantalum diboride, titanium diboride, tungsten diboride, vanadium diboride, or zirconium diboride or mixtures thereof in a Flat magnetron plating coating system for a hardness of Vyckers of at least 2000, wherein the coating step is executed causing the flat surface and a metallizing head of the flat magnetron plating coating system to move in relation to one another at a scanning plating rate to provide a thermal gradient on the flat pressing surface of 10 ° C or less.
2. 2. The method of claim 1, wherein the sweep rate is sufficient to provide a thermal gradient on the flat pressing surface of 1.6 ° C or less.
3. 3. The method of claim 1, wherein the sweep rate is sufficient to provide a thermal gradient on the flat pressing surface of -9.4 ° C or less.
4. 4. The method of claim 1, wherein the flat surface is stationary and the metallized head is caused to move on the flat surface.
5. The method of claim 1, wherein the plating head is stationary and the flat surface is caused to move behind the plating head.
6. The method of claim 1, wherein the sweep rate is from 121.92 cm / minute to 406.4 cm / minute.
7. The method of claim 1, wherein the scanning speed is from 127 cm / minute to 254 cm / minute.
8. The method of claim 1, wherein the sweep rate is from 139.7 cm / minute to 223.52 cm / minute.
9. The method of claim 1, wherein the surface is coated with diborides in a flat magnetron plating coating system for a Vickers hardness of at least 2200.
10. The method of claim 1, wherein the The surface is coated with diborides selected from the group comprising titanium diboride, zirconium diboride and mixtures thereof. eleven .
11. The method of claim 1, wherein the surface is coated with titanium diboride.
12. The method of claim 1, wherein the surface is first coated with titanium in a magnetron plating coating system and then with diboride.
13. 1 3. The method of claim 1, wherein the recovery of duride has a weight of at least 3 m.
14. 14. The method of claim 1, wherein the diboride coating has a thickness of not more than 6 microns. SUMMARY A method for making a flat pressing surface to produce decorative laminate from paper impregnated with resin, with alumina particles on its pressing surface, is coated with diborides selected from the group consisting of hafnium diboride, molybdenum diboride , tantalum diboride, titanium diboride, tungsten diboride, vanadium diboride, or zirconium diboride or mixtures thereof to make the press board resistant to scratching using a process wherein the press plate and the metallized head they move one in relation to the other to provide a sufficient sweep speed to give a thermal gradient on the press plate of 10 ° C or less, to provide reduced accumulation tension and more misplaced heat distribution across the entire plate of the press