MXPA99004416A - Paper for plaster board that reduces winding during lamination, and board that comprises said pa - Google Patents

Abstract

The present invention relates to providing a method for reducing windings in gypsum board panels where the panels are laminated. A laminator is provided as is in at least one gypsum board panel, each panel having a face paper layer and a back paper layer. Each layer of paper has a coefficient of friction and at least one of the front paper layers and a subsequent paper layer are treated with an agent to reduce the coefficient of friction and absorption of the water. A supply of laminate is then provided and installed in the laminator. Then, at least one panel of gypsum board is fed through the laminator, in such a way that one layer of the laminate is applied over the same.

Description

PAPER FOR PLASTERBOARD REDUCING ROLLING DURING LAMINATION, AND BOARD OWING COMPRISES SAID PAPER BACKGROUND OF THE INVENTION The present invention relates to the manufacture of gypsum board panels, and more particularly, to a means by which it can be reduced in size. Largely measure the delamination frequency of gypsum board paper during the lamination of gypsum board panels. Gypsum board panels, in their simplest form, consist of a thin flat sheet of plaster sandwiched between layers of gypsum paper. Usually, one side of the panel is made of a slightly textured light colored paper, which is referred to as the front paper or the manila paper layer. The other side of the panel is usually made with a darker, less lightly textured paper, which is referred to as the backing paper or the newspaper overlay paper layer. For decorative purposes, several films are laminated to the front surface of the gypsum board panels. In typical applications, laminated boards are provided with an exterior pattern that resembles wallpaper. These laminated panels are used in the manufactured home industry to build interior walls in mobile homes, among things. Gypsum board panels are transported through a laminator using conveyor belts. One of the worst defects of the conventional rolling process is that there is a shear differential between the gypsum board and the conveyor belts. This shear differential frequently causes the sheets of the gypsum board panel layer to delaminate as the panels are transported through the laminator. These delaminations are referred to as curls. Windings occur more and more frequently when the gypsum board panels are transported to the installation where the hot rolling is made, or when the rolling is carried out in hot and / or humid weather. The problem of windings is exacerbated by the fact that many facilities are located near man-made house plants, which are concentrated in the southern United States, a region that has a relatively hot and humid climate. After passing through the laminator, the drywall panels are stacked on the front of one with the back of the next on top. In such a manner, any winding of the backing or backing layer of a panel can often cause indentations on the front of the panel against which it is stacked. Gypsum board panels with indentations on their face are often rejected, and are not suitable for sale. The conventional way of dealing with the winding problem is to discard the panels. Due to the large number of coils currently occurring in the gypsum board lamination industry, a procedure that reduces the frequency of these coils can result in greater efficiency in the use of the panels, and significant savings for the rolling mill Thus, it is an object of the present invention to provide an improved method for reducing the windings of gypsum board panels when laminate is applied to the panels. Another object of the present invention is to provide an improved gypsum board panel that will be less susceptible to delamination of its paper layers during the lamination process. Yet another object of the present invention is to provide an improved method for rendering gypsum board paper less susceptible to delamination during the lamination process. COMPENDIUM OF THE INVENTION The above objectives are met or exceeded by the present lamination process for gypsum board panels, which involves the use of an agent having the characteristic of reducing the coefficient of friction and / or absorbency of a water layer. of paper from a panel. As a result, the present process significantly reduces the cutting differential between the paper layer and the conveyor belts used to carry the gypsum board panels through a laminator. With less cutting force generated during rolling, a corresponding reduction in the winding frequency of the paper layer is achieved. While the preferred objective paper layer is the subsequent paper layer, it is also contemplated that the wraps of the paper face layer can be reduced by applying the agent to the face paper layer. More specifically, a method for reducing windings in drywall panels is provided when the panels are laminated. A laminator is provided, since at least one panel of gypsum board, each panel having a face paper face and a subsequent paper layer. Each layer of paper has a coefficient of friction, and at least one of the front paper layers and the back paper layer are prepared with an agent to reduce the coefficient of friction and water absorbency. Then, a supply of laminate is provided and installed in the laminator. Then at least one panel of the gypsum board is fed through the laminator, in such a way that a layer of laminate is applied thereon. In the preferred embodiment, gypsum board panels having a back paper layer that has had its reduced coefficient of friction are provided through treatment with a low friction agent such as silicone or a wax emulsion. It is also preferred that the agent be applied to the upper side of the backing or backing paper layer in a ratio in the approximate range of .24 to 0.73 g / m2 (0.05-0.15 pounds / MSF, where MSF = 92.9 m2 (1000 square feet)) of board. The application of a silicone or wax emulsion in this amount reduces the coefficient of friction in the subsequent paper layer, thereby making the paper less susceptible to rolling during rolling. The agent used also retards the absorption of moisture by the gypsum board produced using the treated paper. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a fragmentary top perspective view of a drywall panel; and Figure 2 is a diagrammatic view of the method of rolling the gypsum board panel.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES Now with reference to Figure 1, a top perspective view of a corner of a gypsum board panel is illustrated. Gypsum board panels, in their simplest form, consist of a thin, flat core of gypsum 10 enclosed between layers of gypsum paper 12, 14. These panels are commonly manufactured by placing a slurry of calcined gypsum, water and additives known, between parallel sheets of back paper 14 and front paper 12, allowing it to cure the calcined gypsum and then heat the resulting panel to expel excess water from the gypsum core. The basic technology of manufacture of gypsum fiberboard is disclosed in U.S. Patents. Nos. 1,500,452; 2,207,339; and 4,009,062, all of which are incorporated herein by reference. For decorative purposes, several films are laminated to the front surface of the panels, which often provide the panels with an exterior pattern resembling wallpaper. Gypsum board panels are used in the home manufacturing industry to build mobile homes among other things. Now with reference to Figure 2, a conventional gypsum board panel rolling line is illustrated diagrammatically. The drywall panels 15 having a paper cover front cover 12 and a rear paper 14 are taken from a stack of panels 16 and fed face up on a conveyor belt 18. A holding roller by rotary bit 20, forces the panel along the conveyor 18 to the rolling roll 28. as the panel 15 passes the laminating roll 28, a laminate layer with an adhesive cover 30 is applied to the paper cover in front of the panel 12. Alternatively, adhesive may be applied to the surface of the paper layer of the face of the panel 12 by an adhesive applicator 22, prior to the application of the laminate film 30. Finally, once the The front paper layer of the panel 12 has been fully laminated, the laminate film 30 is cut, as shown at 32. The laminated panels are then stacked at 34, one on top of the other, with the back paper layer 14 of a panel about the laminated film 30 covering the front paper layer 12 of the directly lower panel. In the process of conventional laminate, a differential cutting between the conveyor belts 18, 26 and the layer of backing paper 14 of the panels are transported cause frequent windings 36 (as best seen in Figure 1) of the paper layer later. This problem is exacerbated when the gypsum board panels are laminated and are above room temperature, which frequently are and / or when the lamination is carried out in hot and humid conditions. As the laminated panels are stored, the curls in the back of one can cause indentations in the face surface of the directly lower one. Gypsum board panels with indentations on their foreheads are often rejected, and are unsuitable for sale. An important feature of this invention is the treatment of gypsum board paper with an agent to reduce its coefficient of friction, either before or after such paper has been converted into a gypsum board panel. This treatment results in a reduction in cutting force that develops between the back paper layer 14 of a gypsum board panel and the conveyor belts 18, 26, used to transport such a panel during the lamination process. Suitable friction reducing agents are those which are applied as a film on the paper or panel and which will not reduce the condition or the known desired properties of the gypsum board. Specific examples of suitable friction reducing agents include: paraffin wax emulsions wherein the paraffin wax has a melting point between 49 and 71 ° C (120 and 160 ° F); emulsions of microcrystalline wax where the microcrystalline wax has a melting point between 54 and 93 ° C (130 and 200 ° F); long and branched chain aliphatic emulsions made from at least one paraffin wax with a melting point between 49 and 71 ° C (120 and 160 ° F) and microcrystalline wax with a melting point between 54 and 93 ° C (130 and 200 ° C) F); long chain and branched aliphatic dispersions made of at least petroleum based or polyethylene base products; hydrophobic silicone emulsions and hydrophobic silicone resins, such as those described in U.S. Pat. No. 3,389,042, which is incorporated herein by reference; polyurethane emulsions and water-dispersible polyurethane colloids such as GRAPHSIZEMR polyurethane emulsion, available from Vining Industries Inc., Atlanta GA 30339; styrene maleic anhydride copolymers; fluorochemical phosphates and fluorochemical products polymerized with at least one of hydrophobic and hydrophobic comonomer, such as fluorochemical paper protector products of the brand SCOTCHBAN ™, available from 3M Minneapolis, MN; complex of long chain fatty acids such as myristic acid and stearic acid, with chain length of 14 to 18 carbon atoms and which are based on one of chromium and aluminum; an alkyl ketene dimer with a carbon chain length of 30 to 34, such as the alkyl ketene dimer brand HERCON 40HR, available from Hercules Inc., Willmington, DE 19894-0001; polyvinyl alcohols between 85 and 99% hydrolyzed with viscosity of less than 150 in 2% solution, such as the polyvinyl alcohol of the brand AIRV0LMR, available from Air Products and Chemicals Inc., Allentown PA 18105; methyl celluloses, with viscosity lower than 150 cp in a 2% solution, such as methylhydroxyl propyl cellulose ET-466, available from Dow Chemical USA, Midland, MI; and natural gums with lubricating properties such as Guar gum, Jaguar ™ brand lubricating gum and Lycoid ™ brand lubricating gum, all of which are available from Rhone-Poulenc, Kennesaw, GA 30144. The desired properties of the agent are lubrication and repellency. water, the latter is also referred to as sizing. In the preferred embodiment, the emulsion Michem 61335 / D, a commercially available wax emulsion ("Michem 61335") is used. This product is manufactured by Michelman Inc., 9080 Shell Road, Cincinnati, Ohio 45236. In the tests described below, Michem 61335 is applied as the solution reducing agent, in varying proportions and to a variety of subsequent papers. However, it has been contemplated that the agent can also, or alternatively, be applied to the front paper before the front paper is applied to the gypsum sheet, or to the front paper layer of the gypsum board panels. , in the event that front paper curls become a problem. It has also been found that, in some cases, additional defoaming is required in the paper production process, when several emulsions or dispersions are applied. The amount of defoamer required varies with the application, local conditions and the amount of surfactants used to manufacture the emulsion that is applied to the paper. The treatment of gypsum board paper with an agent to reduce its coefficient of friction can be carried out before such paper is converted into a gypsum board panel. A supply of gypsum board paper is provided, which can be done in the conventional manner, involving: pulp constituents of scrap paper consisting of old corrugated cardboard, or kraft cuts and waste newspapers; clean, select and refine materials suspended in water; and dry the sheets. Then, before the paper is wound on the hope spool, or end spool in a paper production machine, a layer of friction reduction agent of the type described above is applied to the entire top surface of the paper. As it mentioned above, there are a series of agents that may be suitable for this purpose. In the preferred embodiment, however, Michem 61335 has been used. The quality of the support paper used can have an effect on the required amount of reducing agent to achieve a given coating ratio. For example, when more porous support papers were coated, a greater amount of Michem 61335 was required to achieve the desired coating ratio. The proportion in which the friction reducing agent is applied to gypsum board paper is important. Several different proportions of applied layer of Michem 61335 wax emulsion to the gypsum board support paper, were tested. In the initial test, the support paper was covered with Michem 61335 wax emulsion in a proportion of 2.073 g / m2 (0.042 lb / MSF). This, however, results in later problems, both during the process of converting the coated paper into drywall panels, and in moving and transporting these panels, once formed. More specifically, panels made with backing paper coated in this proportion will tend to slide very easily, both when handled on conveyor belts during the conversion process and when transported in piles after conversion. This excessive slippage is unsuitable for efficient handling, shipping and / or rolling. In subsequent tests, prizes of smaller proportions of application were made, to see if the problem of excessive sliding could be overcome. The application rates of the agent in the range of 0.048 g / m2 (0.01 pound / MSF) to .205 g / m2 (0.042 lb / MSF) were evaluated. Although the actual coating procedure works well regardless of the application rate, it was found that if the agent was applied to paper in proportions greater than .977 g / m2 (0.2 pounds / MSF), the paper became too slippery , again resulting in later problems, both during the process of converting the coated paper into drywall panels, and to move and transport these panels, once formed. At higher coating ratios, problems were also observed in the quality of the production panels. As the wax coating is applied to one side of the paper only, applying too much agent causes the paper to become unevenly tensioned when it becomes a drywall panel, which sometimes results in a ripple in the back of this panel. It was found that keeping the coating proportions below 0.977 g / m2 (0.02 pounds / MSF) 10 seems to be the key to eliminating associated problems where the panels become too slippery, and also seems to eliminate ripples in the panels. In the preferred embodiment Michem 63335 is applied to a gypsum board paper in a coating ratio in a range of from .24 to 0.73 kg / cm2 (0.05 - 0.15 pounds / MSF). The present invention also contemplates that it would be possible to apply a layer of a friction reducing agent to a gypsum board paper, after such paper has been converted into a gypsum board panel. Regardless of where in the process the paper of a gypsum board panel is treated with friction reducing agent, an important feature of this invention is that such treatment can effectively reduce the frequency of windings in a paper layer of the panel during the Rolling process. A series of tests was carried out on various types of gypsum board papers, using Michem 61335 applied in different proportions, as a friction reducing agent. Table I shows the results obtained from tests on gypsum board papers, coated with Michem 61335 wax emulsion in different proportions, to measure the propensity to roll during rolling. The Gypsum Ohio and Jax Grayback papers are related to 11 paper production plants owned by the US Gypsum Company, assignee of the present invention. The lamination occurred in Hartselle, AL. To create the worst-case scenario for the windings, the panels that were being laminated were all hot to the touch, on the ambient temperature they were packed to ship to the laminator immediately after its manufacture in New Orleans, LA, to conserve heat. As indicated in Table I, the treatment of gypsum paper with Michem 61335 has an effect on the "sliding angle" of that paper which is directly related to the coefficient of static friction of the paper. A sliding angle was measured for the paper used in each category of tested gypsum board panels, using "the inclined plane method", as described in the publication T503 QM-84 by the Technical Association of the Indsutria of Pulp and Paper (Technical Association of the Pulp and Paper Industry (c) 1984), which is incorporated herein by reference. Once measured, a slip angle for a surface can be used to obtain, for comparison purposes, the coefficient of static friction for that surface according to the following formula: 12 Static friction coefficient = slip angle / 55.98. In this way, the smaller the sliding angle of a surface, the lower the coefficient of static friction of that surface. To achieve a reduction in the frequency of the coils, a preferred range for the coefficient of friction is between 0.21 and 0.32. As the results in Table 1 indicate, the drywall paper treated with Michem 61335 wax emulsion consistently had a lower slip angle, and thus a lower coefficient of static friction, than untreated paper. In a previous test, where the support paper of the plasterboard had a coating with Michem 61335 in a proportion of 2.05 g / m2 (0.42 pounds / MSF), a sliding angle of 11 ° was obtained. As mentioned above, the coated paper in this proportion was too glossy to be properly converted into gypsum board at the production stage of the panel and therefore, a sliding angle of 11 ° is too low. As indicated by the results in Table 1, treating the backing paper with Michem 61335 at proportions below 2.05 g / m2 (0.42 pounds / MSF) results in a higher slip angle. As the application rate of .48 to 1.46 g / m2 13 ((0.1 to 0.3 pounds / MSF) increased, the sliding angle varied from 14 ° to 15 °, and the number of coils decreased significantly. the proportion of application, the panels made with treated paper had less curl than the panels made with untreated paper, however, as discussed previously, the application of Michem 61335 in proportions exceeding .977 g / m2 (0.2 pounds / MSF) can cause the panels to become too slippery, resulting in problems during the process of converting coated paper into drywall panels, and when moving and transporting such panels once formed. In the preferred embodiment, the sliding angle is approximately 14 ° and Michem 61335 was applied to the gypsum board paper at an application rate in the range of 0.024 to 0.977 g / m2 (0.005 to 0.20 pounds / MSF). 14 TABLE I Treated Paper Paper Layer Paper Layer Support Angle with Sliding-used Front Support (No. of (No. of curls curl degrees degrees) / Sheets tested) / Sheets tested) Paper 37/60 6 / 60 18 regular Paper 40/60 n / a Gypsum Ohio Jax Paper - 25/60 n / a Grayback Paper .48 g / m2 20/60 0 14 regular (.1 lb / MSF) Michem 61335 Paper .977 g / m2 1/60 0 14 regular (.2 lb / MSF) Michem 61335 Paper 1.466 g / m2 0 0 regular (.3 lb / MSF) Michem 61335 The results of a second series of tests, carried out this time in a rolling mill in Phoenix, AZ, are shown in the Table II. Once again, the panels being laminated were hot to the touch, or above room temperature, and except for the control, they were made with support paper treated with a Michem 61335 wax emulsion. For each series of conditions, a Handleable quantity, or stack of 60 panels, is passed through the laminator in the "with" direction, which refers to the address corresponding to that in which the paper is applied to the plaster in the panel manufacturing process. Also, a manageable amount is passed through in the reverse direction or the "against" address. Once again, the results indicate a reduction in the frequency of windings when, before rolling, the supporting paper layer of a gypsum board panel is treated with an agent to reduce its coefficient of friction. The high number of coils observed for the manageable amount of .0122 g / m2 (0.0025 pounds / MSF) of layers of "against" backing paper may be due to the fact that the manageable amount of boards appears to be somewhat malformed or " warped. " 16 TABLE II Treated Paper Layer of Layer of Layer of with of Paper Role Paper Role of supporting support Front Front used "with" "against" "with" "against" (No. of (No. of (No. of (No of enr. / enr. / enr. / enr. / leaves leaves of leaves probaprobaprobaprobadas) das) das) das) Paper 70/60 110/60 20/60 60/60 regular Paper .122 g / m2 14/60 165/60 * 35/60 1/60 regular (.025 lb / MSF) Michem 61335 Paper .244 g / m2 13 / 60 10/60 * 11/60 7/60 regular (.05 lb / MSF) Michem 61335 This manageable amount of boards seems to be "warped", or somehow ill-formed, before lamination, which may explain the high number of curls observed. The results shown in Tables I and II show that treating gypsum board paper with a friction reducing agent, prior to the lamination of said panel, can have a direct effect on the number of coils that may occur. When Michem 61335, the friction reducing agent, was used, satisfactory results were obtained over a range of application rates. However, in the preferred embodiment, Michem 61335 was applied in a proportion of between .244 to .977 g / m2 (0.05 to 0.20 pound / MSF), to obtain a sliding angle of approximately 14 °. Thus, a significant feature of the present invention is that covering the gypsum board paper with a friction reducing agent, such as a silicone or wax emulsion, either before or before said paper has been converted into A panel of gypsum board, can greatly reduce the coefficient of friction of such paper. In this way, the cutting differential that is formed between the paper layer of this panel and the conveyor belts used to transport the panel during the rolling process is reduced. This reduction in the cutting differential can greatly reduce the number of windings in the paper layer during lamination. While particular modalities of gypsum board paper that reduces curls during lamination and board comprising such paper have been shown and described, it will be appreciated by those skilled in the art, that changes and modifications may be made, without departing from the spirit of the invention in its broader aspects and as stated in the claims.

Claims (20)

19 CLAIMS 1.- A method for reducing windings in drywall panels when the panels are laminated, characterized in that it comprises: providing a laminator; providing at least one sheet of gypsum board, each sheet having a front paper layer and a subsequent paper layer, each mentioned layer of paper having a coefficient of friction, and at least one of said front paper layers and the subsequent paper layer is treated with an agent to reduce said coefficient of friction; provide a supply of laminate and install the laminate in the laminator; and feeding at least one of said sheets through said laminator, in such a way that a layer of said laminate is applied to it.

2. The process according to claim 1, characterized in that said agent is chosen from the group consisting of: paraffin wax emulsions wherein the paraffin wax has a melting point between 49 and 71 ° C (120 and 160 ° C) ° F); emulsions of microcrystalline wax where the microcrystalline wax has a melting point between 54 and 93 ° C (130 and 200 ° F); long branched chain aliphatic emulsions made from at least one paraffin wax with a melting point between 49 and 71 ° C (120 and 160 ° F) and microcrystalline wax having a melting point between 54 and 93 ° C (130 and 200 ° F); long and branched chain aliphatic dispersions from at least one of the petroleum base or polyethylene base products; hydrophobic silicone emulsions; hydrophobic silicone resins; polyurethane emulsions; colloids dispersible in water - polyurethane; styrene maleic anhydride copolymers; fluorochemical phosphates; and fluorochemicals polymerized with at least one of hydrophilic and hydrophobic comonomer, complex of long chain fatty acids such as myristic acid and stearic acid, with carbon chain length of 12 to 18, and which are based on one of chromium and aluminum; alkyl ketene dimer with carbon chain length from 30 to 34; polyvinyl alcohols hydrolyzed between 85 to 99% with viscosity lower than 150 cp in 2% solution; methyl celluloses with viscosity lower than 150 cp in a 2% solution; and natural gums with lubricating properties.

3. The process according to claim 1, characterized in that the agent comprises any friction reducing agent that is applicable to the gypsum board as a film and will not decrease the desired known gypsum board condition or properties.

4. The process according to claim 1, characterized in that the agent is applied to at least one front paper layer and one backing or backing paper layer, in a ratio in the range of 0.048 to 4.8 g / m2 (0.01 - 1.0 pound / MSF).

5. The method according to claim 1, characterized in that the gypsum board paper treated with said agent has a sliding angle value in the approximate range of 12 to 18 °.

6. - The method according to claim 5, characterized in that the sliding angle is approximately 14 °.

7. - A method for manufacturing gypsum board to reduce gypsum board paper curls on gypsum board panels during lamination, characterized in that it comprises: providing at least one sheet of gypsum board, each sheet having a layer of paper in front and a layer of back or supporting paper; providing a supply of an agent that is selected from the group consisting of: paraffin wax emulsions in which the paraffin wax has a melting point between 49 and 71 ° C (120 and 160 ° F); emulsions of microcrystalline wax where the microcrystalline wax has a melting point between 54 and 93 ° C (130 and 200 ° F); long chain branched aliphatic emulsions made of at least 22 a paraffin wax with a melting point between 49 and 71 ° C (120 and 160 ° F) and microcrystalline wax having a melting point between 54 and 93 ° C ( 130 and 200 ° F); long chain and branched aliphatic dispersions made from at least one of the petroleum base or polyethylene base products; hydrophobic silicone emulsions; hydrophobic silicone resins; polyurethane emulsions; Dispersible colloids in polyurethane water; styrene maleic anhydride copolymers; fluorochemical phosphates; and fluorochemicals polymerized with at least one of hydrophilic and hydrophobic comonomer, complex of long chain fatty acids such as myristic acid and stearic acid, with carbon chain length from 12 to 18, and which are based on one of chromium and aluminum; an alkyl ketene dimer having a carbon chain length of 30 to 34; polyvinyl alcohols hydrolyzed between 85 to 99% having a viscosity lower than 150 cp in 2% solution; methyl celluloses, having a viscosity of less than 250 cp in a 2% solution; and natural gums with lubricating properties; applying an agent layer to at least one front paper layer and one back paper layer of said panels.

8. - The method according to claim 7, characterized in that the agent is applied to the panels in a proportion in the range of 0.048 to 4.8 g / m2 (0.01 - 1.0 pound / MSF).

9. - The method according to claim 7, characterized in that the agent comprises any friction reduction agent that is applicable to the gypsum board as a film and that will not in any way diminish the condition or the known desired properties of the gypsum board. cast.

10. The method according to claim 7, characterized in that the gypsum board paper treated with said agent has an angle-slip value in the approximate range of 12 to 18 °.

11. The method according to claim 10, characterized in that the value of the slip angle angle is approximately 14 °.

12. - A gypsum board designed to be used in a laminator to reduce windings, characterized in that it comprises: a gypsum core, having a front part and a back or rear part, with at least one of the front and rear parts covered with a layer of gypsum paper, each layer having a coefficient of friction, and at least one of the layers is treated with an agent to reduce the coefficient of friction.

13. - Gypsum board according to claim 12, characterized in that the coefficient of friction of the gypsum paper layer has been reduced through application of an agent that is chosen from the group consisting of: wax emulsions of paraffin where the paraffin wax has a melting point between 49 and 71 ° C (120 and 160 ° F); emulsions of microcrystalline wax where the microcrystalline wax has a melting point between 54 and 93 ° C (130 and 200 ° F); long branched chain aliphatic emulsions made of at least one paraffin wax having a melting point of between 49 and 71 ° C (120 and 160 ° F) and microcrystalline wax having a melting point between 54 and 93 ° C (130 and 200 ° F); long chain and branched aliphatic dispersions made from at least one of the petroleum base or polyethylene base products; hydrophobic silicone emulsions; hydrophobic silicone resins; polyurethane emulsions; Dispersible colloids in polyurethane water; styrene maleic anhydride copolymers; fluorochemical phosphates; and fluorochemicals polymerized with at least one of hydrophilic and hydrophobic comonomer; long chain fatty acid complexes such as fatty acids such as myristic acid and stearic acid, having a carbon chain length of 12 to 18, and which are based on one of chromium and aluminum; a 25 alkyl ketene dimer having a carbon chain length of 30 to 34; polyvinyl alcohols hydrolyzed between 85 to 99% having a viscosity of less than 150 cp in a 2% solution; methyl celluloses, having a viscosity lower than 150 cp in 2% solution; and natural gums with lubricating properties.

14. - Gypsum board according to claim 12, characterized in that the agent is applied in a proportion in the range of 0.0494 to 4.94 g / m2 (0.01 to l.O pound / MSF).

15. - Gypsum board according to claim 12, characterized in that the agent consists of any friction reducing agent that is applied to gypsum board as a film and that does not decrease the known condition or properties desired of gypsum board. .

16. A process for manufacturing gypsum board paper having a reduced coefficient of friction characterized in that it comprises: providing a supply of gypsum board paper, providing a supply of an agent that is selected from the group consisting of: paraffin wax emulsions wherein the paraffin wax has a melting point between 49 and 71 ° C (120 and 160 ° F); emulsions of microcrystalline wax in which the microcrystalline wax has a melting point between 54 and 93 ° C (130 and 200 ° F); long chain branched aliphatic emulsions made of at least one paraffin wax having a melting point of between 49 and 71 ° C (120 and 160 ° F) and microcrystalline wax having a melting point between 54 and 93 ° C (130 and 200 ° F); long chain and branched aliphatic dispersions made from at least one of the petroleum base or polyethylene base products; hydrophobic silicone emulsions; hydrophobic silicone resins; polyurethane emulsions; colloids dispersible in water - polyurethane; styrene maleic anhydride copolymers; fluorochemical phosphates; and fluorochemicals polymerized with at least one of hydrophilic and hydrophobic comonomer; complex of long chain fatty acids such as fatty acids such as myristic acid and stearic acid, having a carbon chain length of 12 to 18, and which are based on one of chromium and aluminum; an alkyl ketene dimer having a carbon chain length of 30 to 34; polyvinyl alcohols hydrolyzed between 85 to 99% having a viscosity lower than 150 cp in 2% solution; methyl celluloses, with viscosity lower than 150 cp in a 2% solution; and natural gums with lubricating properties; Apply one layer of the agent to at least one side of the drywall paper.

17. The method according to claim 16, characterized in that the agent is applied in a proportion in the range of 0.0494 to 4.94 g / m2 (0.01 to l.O pound / MSF).

18. The process according to claim 16, characterized in that the agent consists of any friction reducing agent that is applied to gypsum board as a film and that will not decrease the condition and desired properties of gypsum board.

19. - The method according to claim 16, characterized in that the gypsum board paper treated with the agent has a sliding angle value in the approximate range of 12 to 18 °.

20. The method according to claim 19, characterized in that the value of the sliding angle is approximately 14 °.