MXPA96004572A - Rolls having release coatings, a method for applying a release coating to a roll, and a method of transporting a viscid web - Google Patents

Abstract

Release coatings are provided which will bond securely to commonly used structural and elastomeric, rigid and flexible substrates;including metallic and non-metallic materials. The coatings are compositions of varying percentages of 2-phenoxyethyl acrylate, tetraethylene glycol diacrylate, isobutyl benzoin ether, 1,6 hexanediol diacrylate, cycloaliphatic bis A epoxide, polyurethane acrylate, methyl methacrylate, polysiloxane and other acrylics, tertiary amines, epoxidized novolac, fluorinated alkyloxylate, electromagnetic wave energy sensitive photoinitiators and electromagnetic energy absorbers. Multiple coating layers and multiple frequencies of wave energy are employed to cure the coatings in order to achieve optimum adhesion to substrates combined with optimum release, flexibility, hardness, low friction and abrasion resistance of coatings. The usable electromagnetic wave lengths range from long wave ultraviolet down to short wave gamma rays (i.e. 5500 ANGSTROM to 0.006 ANGSTROM ). Electron beam bombardment can also be used without photoinitiators.

Description

ROLLERS THAT HAVE COATINGS OF RELEASE, ONE METHOD * TO APPLY A COVER OF RELEASE TO A ROLLER, AND A METHOD TO TRANSPORT A VISCOSE CONTINUOUS STRIP CAMI? OF THE INVENTION The field of the invention is that of finishing coatings for rolls that are used in industrial applications, and more particularly rollers having release coatings, methods for making those # coatings and methods for coating the rollers. The field of the invention also relates to machine elements that are used to transport and process a viscous continuous strip and with a method for transporting this continuous strip. BACKGROUND OF THE INVENTION Coated rolls are used »Industrially in demanding environments where they are subjected to high dynamic loads and high temperatures. The covered rollers are used not only to transport the material that is in process, which is in the form of a continuous traveling strip, but also to process the same continuous strip to obtain a finished product. Curved rollers are a particular kind of item of a machine that is used to correct ^ g. distortions and similar problems when distributing stress ^ ~ laterally uniformly through a traveling leaf material. For example, curved rollers are used to disperse or expand the traveling continuous strip with the in order to maintain the width, eliminate wrinkles, eliminate bulky centers or loose edges. Curved rollers are also used to control woolen belts by maintaining their width, opening and seams, and to eliminate the interleaving of individual cut continuous strips in w-reels or winders. Press rollers are another kind of machine element that is used in bite-type presses. The press rolls process the traveling continuous strip by compressing it in the bite. Typically this is done to remove the liquids from the continuous strip, for example, by dewatering presses, or to remove high and low points in a finished product, for example presses of finishing bite. U.S. Patent No. 2,393,191 20 issued to John Robertson, discloses how the transfer of viscous and sticky materials onto the roller and finally into the ball bearings causes rapid gumming of the tracks and roll failure. Robertson also exhibits an expander roller having a rubber cover 25 that allows delicate sheet fabrics A-A- ^ and i a. t i i i_a | faith! »» < , & _r_n continuous be processed without tearing. ^^ ~ Curved rollers with elastomeric sleeves and press rollers with flexible elastomeric covers are machine elements that are used in applications where the continuous strip that is in process is coated with surface improving materials, which are sticky and are transferred to any surface in contact with the continuous strip. In general, the transfer of the viscous materials from the continuous strip to the surface of the roll results in the degradation of the surface of the roll and the surface of the continuous strip. Therefore, it is desired that these rollers are coated with a material which, among others, has the quality of self-cleaning, ie has 5 superior release properties. The rollers covered with release liners prevent excessive sticking which finally allows the "release" of the viscous material P from the surface of the roller. Continuous industrial strip processing applications in the paper, textile and plastics industries, improve through the use of rollers covered with surfaces that have high abrasion resistance, optimal release properties, flexibility and low coefficients of friction. Currently, the 5 industrial needs are met with rollers that have - j * ~. $ »»? ^ .I_i * ..-.

^ Q ^ surfaces treated with epoxies, urethanes, polymers of ^ ^ "Teflon, silicones or waxes Epoxies and urethanes have desirable abrasion resistance properties, but lack the desired superior release properties and low coefficients of friction Teflon polymers and silicones have high release properties and low friction coefficients, but lack the high abrasion resistance qualities.The silicone polish coatings and waxes do not last long enough. The bending surfaces of the curved rollers and the press rollers must have good coating release properties, low coefficients of friction, high flexibility and good resistance to abrasion. The materials that are currently used to cover these machine elements are Teflon shrink tubing, f liners; Sintered Teflon polymer and silicones. These coatings are expensive, they are subject to wear rates excessive, and have poor adhesion to substrates. Normally, they become unusable by simple shear damage during mechanical removal of the continuous strip material from the coating that adheres to the Teflon polymer, and must be removed manually. In this way, there is a need to develop rollers with »A_fl ._? _» M_ < w_to ^ &J «_ * _ ^ * coatings that are harder, have coefficients of »Lower friction and improved release properties, with lower wear rates than the covered rollers that exist today.

SUMMARY OF THE INVENTION The problems caused by the coatings of the prior art are reduced according to the present invention by the application of a release coating on the surface of a roller or a machine element. The coating of the present invention is harder, has a lower coefficient of friction, and better release properties and wear rates than those exhibited by Teflon polymers. In accordance with this invention, it has been found that a liquid solution, of varying percentages of 2-phenoxyethylacrylate, tetraethylene glycol diacrylate, »Isobutyl benzoin ether, 1,6-hexanediol diacrylate, bis A cycloaliphatic epoxide, polyurethane acrylate, or methyl methacrylate, polysiloxane and other acrylic compounds, tertiary amines, epoxidized novolac, fluorinated alkyloxylate, photoinitiators sensitive to electromagnetic wave energy and absorbers of electromagnetic energy, composed of 8 to 24% by weight of 5 polysiloxane, will produce a reaction in the liquid phase of the fg ^ polysiloxane and the acrylated epoxy, creating a precipitate ^^ suspended from epoxidized polysiloxane in a solution predominantly of polyurethane acrylate and monomer. It is an object of the present invention to provide a coating that can be applied to metallic or non-metallic surfaces. Another object of this invention is to provide a method for coating an element of the machine with a release liner. Another object of the invention is to provide a method for curing the coated surface of a machine element with electromagnetic wave energy. Another object of the invention is to provide a method for curing the coated surface of a machine element with electron beam bombardment. Another object of the invention is to provide a method for curing the coated surface of a machine element with ultraviolet light radiation. Another object of the present invention is providing a coating for a machine element that is hard enough to be resistant to abrasion while having high release properties. Another object of the present invention is to provide a coating for an "E" machine element that is resistant to abrasion while having a low ^^ coefficient of friction. Another object of the present invention is to provide a coating for a machine element 5 having improved release properties. Another object of the present invention is to provide a coating of a machine element having low wear rates with respect to prior art coatings. Another object of this invention is to provide a coating for a machine element that has a lower wear rate than that of the Teflon polymer. Another object of the present invention is to provide a coating for a machine element 5 that is resistant to abrasion. Another object of the present invention is to provide a coating for a machine element W that is resistant to abrasion but still flexible enough to apply to machine elements that require flexible surfaces. Another object of the present invention is to manufacture covered machine elements having release coatings applied as a liquid composition of 100% solids and / or solids thinned with solvent. ty ^^^ ta ^^^^^^^^^^ w ^ »g ^^^^^^^ _ ^^^ l ^^^^^^« faith »4» »^^^^^^^ ^^^^^^^ «^^^^^^^^^^^ Another object of the present invention is to apply a release coating to the machine elements located in the field, that is to say in the installation of the user. Another object of the present invention is to provide a new and improved roller that has better release properties. Another object of the present invention is to provide an improved method for processing a viscous continuous strip using rolls with improved release properties. Another object of the present invention is a method for applying a release coating using a minimum of solvents.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view illustrating the application of the adhesive coating to a machine element according to the present invention. Figure 2 is a perspective view illustrating the step of curing a final release layer in a machine element to form a release coating according to the present invention. Figure 3 is a sectional view illustrating a machine element covered with the release liner according to the present invention, which has -j ^ - ,. A. ^^ - ^, .. ^ - ^ -_, ..,. ^. ^ i ^ ¿. »,. ^, ... ^. ^^ ^^^ á- ^ ... ^ A * .... k # a multiplicity of release layers applied on a layer of adhesive substrate. Figure 4A is a sectional view illustrating a bite press having a lower cylindrical roller 5 covered with the release liner of the present invention. Figure 4B is an expanded sectional view of the encircled area in Figure 4A illustrating how the flexible release liner of the present invention can withstand bite deformation. Figure 5A is a plan view of a curved roller illustrating an elastomeric roller cover coated with release liner according to the present invention. Figure 5B is a partially sectioned view of a curved roller illustrating the multiple and adhesive release layers according to the Ü3_ coating. f release of the present invention. Figure 6A is a side view illustrating a curved roller covered with the release liner according to the present invention. Figure 6B is a diagram illustrating the positioning of the curved rollers when processing a viscous continuous strip according to the present invention. Figure 7 is a perspective view that illustrates the application of a release coating to a machine element according to the specific example of the present invention. Figure 8 is a diagram illustrating how a curved roller located in a separate relationship with the press rolls and a sizing bath is used to coat paper in the papermaking industry. Figure 9 is a diagram illustrating a system § of machine elements used to transport a viscous continuous strip in the papermaking industry. Figure 10 is a diagram illustrating a coating process in the papermaking industry. Figure 11 is a diagram illustrating a system of the machine elements used to transport and laminate two viscous continuous strips in a process of papermaking lamination.

DESCRIPTION OF THE PREFERRED MODALITY In principle, a roller having a release coating, the associated method for making the coating and applying it to the roller, and a method for transporting a viscous continuous strip, in its broader global aspects, and then there will be a ^^ _ more detailed description. ^^ In the broadest overall aspects, the release liner of the present invention is a composite coating, comprised of several layers of release coating applied on an initial adhesive layer. In making the initial adhesive layer of the present invention, a liquid composition of 100% solids and / or solids thinned with solvent is prepared from essentially acrylated epoxy, acrylated urethane and acrylated monomer. Then, the adhesive mixture is applied to form an initial layer on the machine element using conventional methods, such as a sprayer. In its broadest and most comprehensive aspects, the release coating of the present invention comprises the addition of acrylated polysiloxane to the adhesive mixture, which results in a liquid phase reaction of the Acrylated polysiloxane and acrylated epoxy, thus creating a suspended precipitate of epoxidized polysiloxane in a solution predominantly of polyurethane acrylate and acrylated monomer. In this manner, the release coating is a liquid composition of 100% solids and / or solids thinned with solvent, prepared to form a pre-reacted solution, which is essentially an epoxidized siloxane matrix in acrylated urethane and acrylated monomer. Then, the pre-reacted solution is applied on the adhesive layer on the machine element using conventional methods, for example a sprayer. The release liner, which includes the initial adhesive coating of the present invention, can be applied to machine elements located in the end user's facilities, thus reducing manufacturing costs and facilitating emergency repairs. The adhesive and release layers can be prepared either concurrently, in separate mixing racks, or consecutively, by adding the acrylated polysiloxane subsequently to the application of the initial adhesive layer. The adhesive and the pre-reacted release coatings 5 can be applied to flexible or rigid substrates, for example to curved rolls, to press rolls or to cartridges. TO * Through the addition of photoinitiators, both the adhesive and the release coatings can be cured using electromagnetic wave energy at wavelengths ranging from approximately 5500 to .006 A, ie, from long wave ultraviolet to gamma rays shortwave. Alternatively, the electronic beam bombardment can be used to cure the coatings without employing photoinitiators.

Tables 1 and 2 summarize the chemical ingredients that are used to create the liquid oligomers for the adhesive and the release coating layers, respectively. As used throughout this specification and in the claims, all percentages are by weight unless otherwise specified. The chemical agents listed in Table 1 are mixed together to form the solution for the initial adhesive coating in the proportion indicated. Each of the ingredients may vary as indicated by the range of percentage amounts of Tables 1 and 2. However, any increase in one of the ingredients must be offset by a corresponding decrease in other components.

» In general, 2-phenoxyethylacrylate and tetraethylene glycol diacrylate and 1,6-hexanediol diacrylate are polyacrylates comprising the acrylated monomer. The bis A cycloaliphatic epoxy diacrylate is an example of an acrylated epoxy that is normally used. Typically, the urethane diacrylate is combined with 1, 6-hexanediol diacrylate to decrease the viscosity in the acrylated polyurethane. The isobutyl benzoin ether is an example of a free radical initiator that is commonly used, while the triarylsulfonium hexafluoroantimonate salt is commonly used as a cationic photoinitiator. Other equivalent ingredients may be used to augment or substitute the ingredients mentioned in * ^ - * - u ti n - rfr g-fc Tables 1 and 2. The epoxidized novolac is an epoxy ^^ alternative that imparts additional resistance to abrasion and greater hardness in the final product, if desired, as per example in press rolls. The tertiary amines are 5 additives attached to the photoinitiators that extend the curing beyond the ultraviolet curing phase. A methacrylate, such as glycidyl methacrylate, for example, can be used as an alternative, highly reactive monomer, and when added, the fluorinated alkyloxylate imparts additional release properties to the coating. In general, to manufacture a coated machine element of the present invention, from 9 to 26 weight percent acrylated epoxy, 10 to 35 weight percent acrylated urethane, 8 to 24 weight percent acrylated polysiloxane, 28 to 52 weight percent acrylated monomer and 2 to 8 weight percent free radical and cationic photoinitiators are initially mixed together to form a mixture of liquid oligomers in a mixed pan. In its broadest overall terms, the release coating of the present invention comprises oligomers of acrylated epoxy, acrylated urethane, acrylated siloxane and acrylated monomer. Finally, the acrylated epoxy and acrylated urethane are the components ¡^^ »£ ^« ¡^ ^^^^ ü ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the properties of resistance to ^^ abrasion in the coating, while acrylated urethane and acrylated monomer are the components that add flexibility and subjection. The precipitate of epoxidized siloxane imparts to the coating hardness and superior release properties. The photoinitiators are added to the oligomers to crosslink the pre-reacted solution during the application of electromagnetic energy. The electromagnetic radiation of a machine element covered with the release coating of the present invention causes the photoinitiators to generate free radicals and cationic particles that initiate the formation of crosslink bonds between the polymers and the siloxane. Several 5 different classes and different combinations of photoinitiators can be used as described in the text, "Radiation Curing Science and Technology", Edited by J_W S. Peter Papas, (1992 Plenum Press), the teachings of which are incorporated here as a reference. Figure 1 illustrates how the adhesive coating of the present invention is applied to a roller 10 rotatably mounted on the bearings 11 and 12. The arrow 13 indicates the direction of the roller 10, which is arbitrary. A transverse carriage 1 travels forward and backward along the length of the roller 10. For purposes of illustration, the carriage * ....- «ifcM ^, _» ^, A._lrttd ^^ ^^ _______ JÍ _____ i .l ... ^ -__- »* transverse 1 is shown moving in the direction of ^^ arrow 2. The mixing vessel 3 containing the oligomers comprising the adhesive coating, and ultraviolet lamps 6, are mounted on the upper part 5 of the transverse carriage 1. The spray head 4 applies the liquid adhesive coating 5 to the coating roller 10 for forming a first layer 14 for subsequent bonding of the additional release coating layers. The ultraviolet lamps 6 radiate f long wavelength electromagnetic energy 7 to effect partial curing of the adhesive layer 14. This creates good adhesion between the initial adhesive layer 14 and the roller 10, and provides a reactive film 15 partially reacted on the outer surface for subsequent bonding with additional layers of release coating. _ ^ The pre-reacted liquid oligomer mixture ^ F comprising the release coating is applied in the same manner as for the adhesive coating. In a manner similar to Figure 1, Figure 2 shows how a roller 10 of the present invention is finally cured with ultraviolet lamps 5 that radiate electromagnetic wave energy 6. The arrow 13 indicates the rotational direction of the roller 10, which is arbitrary . Figure 2 5 also symbolically shows how the final layer 16 is cured to form a finished release liner 17, »Which is a matrix composed of crosslinked epoxidized polysiloxane acrylate hard sites, dispersed in a flexible, lower modulus binder of the cross-linked polyurethane acrylate, and an acrylated monomer. Transparent reinforcing charges to the electromagnetic wave energy (not shown) can be used to increase the thickness of the individual coating film and reduce production costs. Figure 3 shows an embodiment of the present invention in a cylindrical machine element covered with several release coating layers. The metal roller 10 is coated with a layer 11 of initial adhesive that has been partially cured. This is followed by the application of several layers of release coating containing polysiloxane, layers 12 to 16, until an abrasion resistant and flexible F resistant release layer of desired thickness is formed. Referring to Figures 1 to 3, the final coating 0 comprised of all layers is cured with shorter and more intense wavelength energy. Throughout the application process, multiple coating layers and multiple wave energy frequencies are used to cure the coatings in order to achieve maximum adhesion to the substrates, combined with optimum release, you. & < ^ * flexibility, hardness, low friction and resistance to abrasion in coatings. The degree of flexibility or rigidity of the cured coating can be controlled by the percentages 5 of acrylated epoxy and acrylated urethane used in the solution. The reacted liquid phase of the coating contains 1 to 4% of a combination of free radicals and cationic particles that generate photoinitiators, which react with electromagnetic wave energy (for example, ultraviolet light) to effect a hard curing of the liquid coating. With further reference to Figures 1 to 3, the initial adhesive coating 11 is composed of acrylated polyurethane, acrylated epoxy and acrylated monomers.

The subsequent additional multiple layers, layers 12 to 16, contain the precipitated matrix of the epoxidized polysiloxane suspended in polyurethane acrylate and monomer • ^ acrylated. This combination provides extremely good adhesion to substrates combined with a thick multi-layered coating having good hardness, and releasing properties throughout the entire thickness or depth of the coating, instead of presenting the silicone-rich surface and poor adhesion that is obtained from the small additions of polysiloxane, from 0.5 to 2% by weight, for example, and that ^ k lasts long enough in a processing application of '^ continuous strip. Figures 4A and 4B show a bite press 10 having machine elements 1 and 2, 5 cylindrical, upper and lower, respectively. The lower machine element 2 is coated with a flexible release liner 4 of the present invention. (For illustrative purposes, the traveling strip or the traveling sheet that is in jjp processing, is not shown). Figure 4B, which is an enlargement of the encircled area 3 in Figure 4A, shows the lower machine member 2 coated with the release liner of the present invention comprising an initial layer of adhesive 11 and several layers of release liner 16 that have been applied as described above. Figure 4B also shows how the release liner of the present invention should have sufficient flexibility to withstand a bite deformation 20. Figure 5A shows, in general, how a curved roller 10 consists of three basic elements. A non-rotating shaft 12 that is curved to provide the degree of curvature required for a specific application. A plurality of ball bearing units 14, designed especially, they are mounted on the shaft 12 so that -efe the outer tracks (not shown) of the ball bearing units 14 are free to rotate, while the inner tracks of the ball bearing unit (not shown) are kept stationary on the axis 12. With further reference to Figure 5A, outer shell 15, or spool, as commonly referred to in the art, is attached to the outer race of each bearing unit 14. A special elastomeric sleeve 18 made of rubber ^ ¡^ Flexible, it is assembled on the outer shells 15 of the * _W ball bearing units 14. A curved roller 10 has a concave side 26 and a convex side 28 with an apex approximately shown by the arrow 30. Although not shown, the curved roller 10 is mounted on special mounting brackets that allow that the roller is mounted at any angle to vary the location of the apex 30 of the roller relative to the traveling strip that is § in process. In operation, the flexible sleeve 18 expands with rotation from the concave side 26 of the curved shaft 20 to the convex side 28. The curved roller is positioned so that the continuous strip approaches the concave side roller 26 and comes out the convex side 28. In this way, the continuous strip is dispersed in the transverse direction of the machine. The adjustment of the direction of the curved 25 is easily achieved by the axis of rotation 12 «Jfc on special mounting brackets, (not shown). * ^ Figure 5B is a partial section of the curved roller 10 of the present invention showing a flexible sleeve 18 covered with a layer of adhesive 20 and a multiplicity of release layers 21 to 25, according to the present invention. Although not shown, the curved rollers and elastomeric sleeves may each have the outer shell 15 of each individual bearing unit 14, B covered with the coating of the present invention. Figure 6A is a side view of a curved roller covered with the release liner of the present invention. Figure 6B shows, in phantom lines 12, how the curved roller 10 can be positioned between the guide, input 30 and exit 32 rollers, respectively, to expand the traveling strip 34.

The dispersion of the traveling continuous strip 34 (or correa wool belt) starts when the continuous strip 34 leaves the input roller 30 which is directly below the curved roller 0 10. As the continuous strip 34 leaves the curved roller 10, dispersion is completed. To avoid the tendency of the continuous strip to revert back to its original state, the exit roller 32 is located proximal after the curved roller 10. The closer the 5 curved roller 10 is to the next roller in process, the better > - * _, f__ i_ _.?tÚA? t:._. ? t__ ?? ? ^ i: * ÍÍ? í_í *** ¿__m > ... - .- J. g ^., -...... A ^^^ ^ ß will be the work of "locked in" -of the dispersion that is being achieved. Also, by varying the configuration of the curved roller 10, the continuous strip 34 can be uniformly dispersed from the center of the two outer edges 5 of the roller, or dispersed more in the center than at the edges to correct bulky centers or more at the edges to correct loose edges. The present invention is further illustrated by the following non-limiting example. In this specific example, the adhesive and the release coating are comprised of solutions tabulated by weight percent in Tables 3 and 4, respectively. As a corollary to Table 4 and as used throughout this specification and in the 5 claims, Table 5 lists the various chemical agents in Table 4 with their average and average molecular weights.

Chemical structures using Lewis structures, such as ft? - are known in the art. When applicable, the acronyms that are normally used are listed. 0 . _M » TABLE 5 * Average molecular weight (PMP) and chemical structure 2-Phenoxyethylacrylate, (2-PEA) PMP: 192 Tetraethylene glycol diacrylate (TEGDA) PMP: 302 $ 1,6-hexanediol diacrylate (HDODA) PMP: 226 ^ __ ^^ __, ii¿__a J _._- .. ^ t,. ^^ «i., __. ^ Í .. - -» - «- ^ t., \ * u * - & At .J ? ft The solutions that comprise the adhesive and the ^ release coating, respectively, are mixed in separate mixing containers for 15 minutes, before use and continuously subsequently, through the application of the coating to the machine element. The two coating materials, the adhesive and the release coating solutions, are maintained at elevated temperature, preferably in the order of - * approximately 150 ° F, and respective pressure vessels are continuously mixed in their IR, preferably at a mixing speed of 200 rpm. The preferred cationic photoinitiator is triarylsulfonium hexafluoroantimonate and the preferred free radical photoinitiator is isobutyl benzoin ether. In relation to Figure 7, the roller 1 is rotatably mounted in the bearings 2 and 3. The adhesive and the - ^ chemical release coating compositions • ^ Tables 3 and 4 are contained in containers 5 and 6, respectively, having spray heads 7 and 8, respectively and supported on a transverse carriage 11. The curing energy sources 9 and 10 are mounted on both sides of the spray heads 7 and 8 to allow coating and curing in both transverse directions. The spray application system is composed of liquid feeding containers t pressurized low temperature and in a high volume head applicator gun. In this specific example and with further reference to Figure 7, the adhesive coating mixture 5, (Table 3), is applied with a 50 psi gun pressure from the mixing vessel 5 through the spray head 7. , to form an initial substrate layer on the surface of the rotating roller, with a film thickness of approximately 0.003".The two R coating materials, the adhesive and the release coating solutions, are maintained at an elevated temperature, preferably in the order of about 150 ° F, and mixing continuously in their respective pressure vessels, 7 and 8, preferably at a mixing speed of 200 rpm, as indicated by arrow 15, the rotational surface speed of the roller 1 is approximately 30 feet per minute while the speed of the cross carriage 11 varies with the diameter of the roller 1. In this specific example, a roller having a diameter of 7"re. wants a cross-sectional speed of 60"per minute. The application of the adhesive layer starts at the end 20 of the roller 1 and continues beyond the end 30 while the curing energy source 9 is then activated to effect a partial curing of the applied coating layer. Each f power source 9 and 10 consist of 12"long focused ultraviolet lamps that deliver 450 watts per inch of lamp length, then the second coating layer, which is The first release layer is applied over the initial adhesive layer in the opposite direction from end 30 to end 20, using a second transverse energy source 10 to partially cure that layer. Crossing end to end, the procedure of applying additional layers of the release coating is repeated until a desired coating thickness of 0.060"is applied and partially cured.After applying the final release coating layer, the transverse velocity of the car is reduced to 20"per minute and the two curing energy sources 9 and 10 are used to increase the radiation energy per square inch of coating by a factor of six to complete the B curing radiant energy of the coating. An additional post curing is achieved by thermal curing at 0 temperature and ambient humidity for several days. The excess spray is removed from the air through a filtered outlet system. The release coating manufactured according to the above has the properties indicated in Tables 5 and 6.

This coating can also be applied to rollers that are installed in process machines located in the production facilities of the end users, using the transportable portable application and filtered exhaust systems of excessive dew accumulation. Rolls having release coatings according to the present invention are used, advantageously, in mills for the preparation of sizing papers, with fillers and coated. Referring to Figure 8, a process for coating paper including press rollers and curved rollers coated with the coating of the paper is diagrammatically shown. _ & * % _í ú i'f.hí ü, i_á- £ iksí * '* -HÍ_B-S-t »j« i.4.'. -MB- > - » "i». _f? _ - .ja »¿Mtju t? _l * _» ». release of the present invention. As shown in Figure 8, the continuous strip 1 coming from the direction indicated by the arrow 2 enters the sizing bath 3 which contains the viscous liquid coating 4. As the continuous strip 1 is fully coated, it is processed under and on several conveying rollers 5a-5c respectively, and passes through the bite press 6 comprised of press rolls 7a and 7b. After, the strip __ continuous 1 is dispersed by the curved roller 8 and the carriage roller 9 before the removal of moisture and curing with the heated roller 10, rotating in the direction indicated by arrow 11. Arrow 12 and circles 13 and 14 , represent curved rollers 8 and form a symbol well known in the art used to indicate the direction of bending. This conventional symbol is of a double circular arrow and is used in Figures 8 to 11. In specific relation to Figure 8, the double circular arrow if symbolically indicates the direction of bending from the side 13 towards the apex 14 of the curved roller 8 Corao is shown in the art, the higher the apex 14 is with respect to the side 13, indicated by the arrow 12 which is being rotated in the continuous strip 1, the greater the amount of dispersion to eliminate the bulging centers. Conversely, as the apex 14 of the curved roller 5 8 (or arrow 12) is rotated away from the strip _ *? -? __ .. ** _? _ A.I_ ~ __t ___._ - - ~ ** ^ - ^^ - * - * - > - * - C - ^ - ^ - i - »- ^ -» »- * -" ** ^ «~ - -B _» _, __ »continuous 1, the greater the degree of dispersion towards ^^ edges of continuous strip 1 to eliminate loose edges. When the release liner of the present invention is applied to the machine elements described above, the traveling web 1 does not stick to the various roller surfaces. Figure 9 shows diagrammatically how the feed rollers 1 supply the continuous strip 2 on the conveyor rollers 3a and 3b in the direction ^ shown in the arrows 4a, 4b and 4c. The curved rollers 5a covered with the release liner of the present invention are placed before the sizing press 6 and keep the continuous strip 2 under uniform transverse tension before saturation with the material viscose. The curved rollers 5b and 5c are covered with the release coating of the present invention, and in conjunction with the drying rollers 7a, 7b and 7c, ^ Use to remove wet wrinkles and control bulky centers and loose edges. Figure 10 illustrates diagrammatically how the continuous strip 1 traveling in the direction indicated by the arrows 2a and 2b passes over the conveying rollers 3, the curved roller 4 and through the coating station 5 comprising the press rolls 6a and 6b, and to the coating bath 7 containing the viscous material 8. The curved rollers 4 which are covered with the release liner of the present invention are placed in front of the coating station to eliminate wrinkles. Although not shown, the curved roller 4 can alternatively be placed after the coating season. Figure 11 illustrates the lamination of the sheets 1 and 2 and shows how the curved rollers 3 and 4 and the carriage rollers 5, 6, 7 and 8, covered with the release liner of the The present invention can be placed to maintain the * ^) leaves 1 and 2 free of wrinkles and under a uniform tension, thus avoiding air bubbles in the lamination. The supply rollers 9 and 10 and the press rollers 11 and 12 are also shown. According to the present invention, the strip continuous 1 that is being processed does not stick to the rollers and the machine elements involved do not adhere or # stick. In the above specification, the invention has been described in relation to specific exemplary modalities thereof. Therefore, it will be evident that various modifications and changes can be made without departing from the spirit and scope set forth in the appended claims. The drawings and the specification should therefore be taken as an illustrative issue and not in a restrictive sense. __? __ 'go. _ ?? _fí_ ftfciiÉÍÉí '^ ít t-tf' r - _ * f '' *?

Claims (20)

1. CLAIMS: 't 1. A method for applying a release coating to the surface of a machine element, the method comprises the steps of: (a) applying a first oligomer mixture on the surface to form a coat of adhesive; (b) radiating the adhesive layer with sufficient electromagnetic energy to effect partial curing of the layer; (c) applying a second pre-reacted reactive oligomer mixture on the adhesive layer to form a first release layer, the first release layer is bonded with the adhesive layer, and curing the release layer with a sufficient amount of energy 15 electromagnetic; (e) finally radiate the layers with sufficient ____ electromagnetic energy to form a fully cured homogenous Wr coating. The method according to claim 1, further including the step of repeating step (c) until sufficient release layers are applied to form a coating of the desired thickness. 3. The method according to claim 1, wherein the formation of the first oligomer mixture 25 comprises the step of mixing the liquid solutions of # different percentages by weight of acrylated epoxy, acrylated urethane and acrylated monomer, and continuously mixing the mixture at an elevated temperature. 4. The method according to claim 3, wherein the temperature is about 150 ° F. The method according to claim 3, wherein the first oligomer mixture further comprises photoinitiators. The method according to claim 1, wherein the second pre-reacted reactive oligomer mixture is formed, the steps of mixing the liquid solutions of different percentages by weight of acrylated epoxy, acrylated urethane, acrylated monomer and polysiloxane at a elevated temperature, the second mixture The pre-reacted reactive oligomer is in a liquid state which is continuously stirred in a container of # mixed. 7. The method for forming the second oligomer mixture of claim 6, wherein the mixture of 0 oligomer further comprises photoinitiators. 8. The method for forming the second pre-reacted reactive oligomer mixture according to claim 6, wherein the temperature is about 150 ° F. 9. The method according to claim 1, further including the step of applying the coating of , jg release to a machine element, the machine element "^ is placed on the site of a user's installation 10. A method for applying a release coating to the surface of a roller, comprising the 5 steps of: mixing a liquid solution of variable percentages of 2-phenoxyethylacrylate, tetraethylene glycol diacrylate, isobutyl benzoin ether, 1,6-hexanediol diacrylate, bis A epoxy cycloaliphatic diacrylate, ^^ polyurethane acrylate, 1,6-hexanediol diacrylate, * ^ J methyl methacrylate, methoxy (meth) acrylate siloxane and other acrylic compounds, tertiary amines, epoxidized novolak, fluorinated alkyloxylate, photoinitiators sensitive to electromagnetic wave energy, and electromagnetic energy absorbers, composed of 5 to 15 30% by weight of polysiloxane, the liquid mixture comprises a liquid reaction phase of polysiloxane and epoxy # Acrylated thus creating a suspended precipitate of epoxidized polysiloxane in a solution predominantly of acrylated polyurethane and monomer. 11. The method according to claim 10, further comprising the step of applying the release liner to a roller, the roller being located in the field, in a user's facility. 12. On a roller having a curved stationary axis 25 that supports a multiplicity of bearings > rotating cylindrical plates with rigid cylindrical plates fixed to the outer rotating bearing race and covering it, which supports a flexible elastomeric sleeve and continues to rotate around the stationary curved shaft; 5 improvement comprising: a release liner, flexible and resistant to abrasion, the coating is applied to the flexible elastomeric sleeve and cured with electromagnetic wave energy, the release liner further comprises a cross-linked epoxidized polysiloxane acrylate, dispersed in the flexible binder of the lower module of acrylated polyurethane and acrylated monomer crosslinked. The roller according to claim 12, wherein the release coating is cured by electron beam bombardment. 14. On a roll that a curved stationary shaft, which supports a multiplicity of bearings < _ Rotating with rigid cylindrical shells fixed to the rotating outer race of the bearings and covering the same, or the improvement comprising: a flexible and abrasion resistant release coating, wherein the coating is applied to the cylindrical shells and is cured with electromagnetic wave energy, the release coating 5 further comprises epoxidized polysiloxane acrylate and f crosslinked dispersed in a flexible binder of lower module of acrylated polyurethane and crosslinked acrylated monomer. 15. The roller according to claim 14, wherein the release coating is cured by electron beam bombardment. 16. On a flexible and submissive press roll that has surfaces that have a cylindrical shell ^ rigid surrounded by a thick elastomeric cover and < The low modulus, which is indented in the pressure bite area, produced by a second roller, the improvement comprising a flexible release liner that is cured in place with electromagnetic wave energy, the release liner further comprising a 15 epoxidized polysiloxane acrylate, crosslinked, dispersed in a flexible binder with a lower polyurethane modulus acrylate and acrylated monomer crosslinked. ^ F 17. The roller according to claim 13, wherein the flexible release liner is cured with 20 electronic beam bombardment. 18. In a haul roller having a cylindrical surface, the improvement comprising a flexible release liner that is cured in place with electromagnetic wave energy, The release liner further comprises a epoxidized and crosslinked polysiloxane acrylate, dispersed in a binder of flexible lower module of acrylated polyurethane and acrylated monomer crosslinked. 19. The roller according to claim 16, wherein the flexible release coating is cured by electron beam bombardment. 20. In a process for processing a viscous material, wherein the improvement comprises passing the material over the machine elements covered with a release coating, the release coating further comprises epoxidized and crosslinked polysiloxane acrylate, dispersed in a flexible binder of lower module of acrylated polyurethane and acrylated monomer crosslinked. # SUMMARY OF THE INVENTION Machine elements are disclosed which have release coatings that are cured with electromagnetic wave energy, which are highly resistant to abrasion, flexible, low friction, and are release liners for flexible elastomeric substrates that are They use in curved rollers and press rollers. The release coatings are highly resistant to abrasion and 100% solids that are polymerized by curing with electromagnetic wave energy in a wavelength range from 5500 Á to 0.006 Á. These coatings will bond securely to the rigid, flexible, structural and elastomeric substrates that are normally used; including metallic materials and not 15 metallic. Coatings or compositions of varying percentages of 2-phenoxyethylacrylate, tetraethylene glycol diacrylate, isobutyl benzoin ether, diacrylate »1, 6-hexanediol, bis A cycloaliphatic epoxide, polyurethane acrylate, methyl methacrylate, polysiloxane and other compounds 20 acrylics, tertiary amines, epoxidized novolac, fluorinated alkyloxylate, photoinitiators sensitive to electromagnetic wave energy and absorbers of electromagnetic energy. Several coating layers and multiple wave energy frequencies are employed to 25 cure the coatings in order to achieve the optimum adhesion to substrates in combination with optimum release, flexibility, hardness, low friction and abrasion resistance of the coatings. Useful electromagnetic wavelengths vary between long wave ultraviolet to short wave gamma rays (ie from 5500 Á to 0.006 Á). Electron beam bombardment can also be used without photoinitiators. # # É ?? ^ A t-t-t-a- ll .. i-ta- ..Me & i * - *. »-« .._, -A .. ._._._- JÉl