CN117986034A - Method for preparing hydrophobic film on surface of gypsum board - Google Patents
Method for preparing hydrophobic film on surface of gypsum board Download PDFInfo
- Publication number
- CN117986034A CN117986034A CN202410004427.2A CN202410004427A CN117986034A CN 117986034 A CN117986034 A CN 117986034A CN 202410004427 A CN202410004427 A CN 202410004427A CN 117986034 A CN117986034 A CN 117986034A
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- CN
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- Prior art keywords
- gypsum board
- front surface
- paper
- alkali solution
- hydrophobic film
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 56
- 239000010440 gypsum Substances 0.000 title claims abstract description 56
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003513 alkali Substances 0.000 claims abstract description 37
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 21
- 239000001257 hydrogen Substances 0.000 claims abstract description 21
- -1 methyl hydrogen Chemical class 0.000 claims abstract description 21
- 229920002545 silicone oil Polymers 0.000 claims abstract description 21
- 238000001035 drying Methods 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims description 37
- 230000001815 facial effect Effects 0.000 claims description 35
- 239000007921 spray Substances 0.000 claims description 26
- 239000011248 coating agent Substances 0.000 claims description 24
- 238000000576 coating method Methods 0.000 claims description 24
- 239000012670 alkaline solution Substances 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 5
- 230000007480 spreading Effects 0.000 claims description 2
- 229910008051 Si-OH Inorganic materials 0.000 abstract description 8
- 229910006358 Si—OH Inorganic materials 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000835 fiber Substances 0.000 abstract description 3
- 125000001165 hydrophobic group Chemical group 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 238000012643 polycondensation polymerization Methods 0.000 abstract 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000012792 core layer Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a method for preparing a hydrophobic film on the surface of a gypsum board, which comprises the following steps: and (3) smearing an alkali solution mixed with methyl hydrogen silicone oil on the front surface of the lower facing paper, and then drying the wet gypsum board. In the process of drying the gypsum board wet board under alkaline conditions, the Si-H which is not hydrolyzed and water molecules evaporated from the board core continue to hydrolyze into Si-OH, part of the Si-OH is combined with the facing paper fiber to fix the hydrophobic group on the front surface of the gypsum board, and the other Si-OH forms a more stable-Si-O-covalent network through self-condensation polymerization to cover the front surface of the gypsum board, so that the front surface of the gypsum board forms a hydrophobic film.
Description
Technical Field
The invention relates to the field of gypsum board production lines, in particular to a method for preparing a hydrophobic film on the surface of a paper-surface gypsum board.
Background
The main components of the paper surface gypsum board are gypsum, surface protection paper and partial additives, the gypsum and the surface protection paper have the characteristic of easy moisture absorption, the surface of the surface protection paper has hydrophilicity, and water can permeate through the paper surface to enter the gypsum core layer in the environment with high humidity.
To solve this problem, a hydrophobic film may be formed on the front surface of the gypsum board to prevent moisture from penetrating the paper surface into the gypsum core layer, and the lower facing paper of the gypsum board is known as a use surface, and one surface of the upper facing paper of the gypsum board is generally facing a wall or a ceiling and is not generally affected by a humid environment, so that it is generally only necessary to form a hydrophobic film on the front surface of the lower facing paper.
Disclosure of Invention
The invention aims to provide a method for preparing a hydrophobic film on the surface of a gypsum board, which aims to solve the technical problem of how to form the hydrophobic film on the front surface of lower facing paper of the gypsum board.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
a method for preparing a hydrophobic film on the surface of a gypsum board, comprising the following steps: and (3) smearing an alkali solution mixed with methyl hydrogen silicone oil on the front surface of the lower facing paper, and then drying the wet gypsum board.
Further, after the lower facing paper passes through the lower facing paper deviation corrector, the alkaline solution is smeared on the front surface of the lower facing paper.
Further, the alkaline solution is applied to the front side of the lower facer sheet prior to the lower facer sheet passing through the lower facer scoring machine.
Further, a second lower facing paper deviation corrector is added between the lower facing paper deviation corrector and the lower facing paper scoring machine, and after the alkaline solution is smeared on the front surface of the lower facing paper, the lower facing paper passes through the second lower facing paper deviation corrector.
Further, a blank area with the width of 10 mm-15 mm is reserved on two sides of the front surface of the lower facing paper, and the alkali solution is smeared on the parts outside the blank area.
Further, the step of coating the alkali solution mixed with methyl hydrogen silicone oil on the front surface of the lower facing paper comprises the following steps: spraying the alkali solution on the front surface of the lower facial tissue by using a spray gun; the alkali solution attached to the front side of the lower facing paper is smoothed out using a spreading member.
Further, the number of the spray guns is a plurality, the spray guns are arranged side by side at equal intervals along the width direction of the lower facing paper, and each spray gun can be independently opened or closed; the number of the coating parts is at least 2, a plurality of the coating parts form a continuous and uninterrupted coating area in the width direction of the lower facial mask, and the position of at least 1 coating part in the width direction of the lower facial mask can be adjusted to change the whole width of the coating area; the step of spraying the alkali solution on the front surface of the lower facing paper by using a spray gun comprises the following steps: selectively opening part of the spray gun to enable the alkali solution sprayed by the spray gun on the lower facing paper to avoid a blank area; the step of trowelling the alkali solution attached to the front side of the lower facer using the applicator member comprises: the position of the coating part is adjusted to change the whole width of the coating area, so that the edge of the coating area is attached to the edge of the blank area.
Further, the step of coating the alkaline solution mixed with methyl hydrogen silicone oil on the front surface of the lower facing paper further comprises the following steps: and a supporting component is arranged on one surface of the lower facial tissue facing away from the smearing component, the supporting component comprises a smooth line or surface for supporting the back surface of the lower facial tissue, and the acting force applied on the front surface of the lower facial tissue by the smearing component is counteracted by using the supporting component.
In another aspect, the step of coating the alkaline solution mixed with methyl hydrogen silicone oil on the front surface of the lower facing paper further comprises: and a belt conveyor is arranged on one surface of the lower facial tissues facing away from the smearing part, the transmission surface of the belt conveyor is attached to the back surface of the lower facial tissues, the transmission speed of the belt conveyor is in the same direction and same speed as the linear speed of the lower facial tissues, and the width of the transmission surface of the belt conveyor is larger than that of the lower facial tissues.
Further, the step of coating the alkaline solution mixed with methyl hydrogen silicone oil on the front surface of the lower facing paper further comprises the following steps: and detecting the printed patterns on the front surface of the lower facing paper by using a color sensor, calculating the linear speed of the lower facing paper according to the interval time of the occurrence of the adjacent 2 printed patterns, and then adjusting the transmission speed of the belt conveyor so that the transmission speed of the belt conveyor is equal to the linear speed of the lower facing paper.
Compared with the prior art, the application has the following beneficial effects:
The method comprises the steps of coating an alkaline solution mixed with methyl hydrogen-containing silicone oil on the front surface of lower facing paper, wherein a plurality of chemically active Si-H groups exist in the methyl hydrogen-containing silicone oil, drying the gypsum board wet board, continuously hydrolyzing water molecules evaporated from the board core and Si-H which are not hydrolyzed into Si-OH in the process of drying the gypsum board under alkaline conditions, fixing the hydrophobic groups on the front surface of the gypsum board by combining part of Si-OH with facing paper fibers, and forming a more stable-Si-O-covalent network by self-condensation, so that the hydrophobic film is formed on the front surface of the gypsum board.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
FIG. 1 is a schematic illustration of an embodiment of the present invention a perspective view of the smearing device;
fig. 2 is a bottom view of an applicator according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along the direction A-A of FIG. 2, and an enlarged view of a partial structure thereof;
Reference numerals in the drawings are respectively as follows:
1-lower facing paper; 11-blank area; 2-an application part; 21-rag; 22-elastic plates; 3-a spray gun; 31-an electromagnetic valve; 4-a servo slipway; 5-piping; 6-belt conveyor; 7-color sensor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following provides a method for preparing a hydrophobic film on the surface of a gypsum board, which comprises the following steps:
Before the gypsum board is dried, an alkali solution mixed with methyl hydrogen silicone oil is smeared on the front surface of the lower facing paper 1, and then the gypsum board is dried.
The hydrophobic membrane is formed by the following principle:
The alkali solution can adopt potassium hydroxide, methyl hydrogen-containing silicone oil is a highly polymerized organic compound, a plurality of Si-H groups with active chemical property exist in the molecule, in the process of drying the gypsum board with paper surface under alkaline conditions, the Si-H which is not hydrolyzed and water molecules evaporated from the board core continue to hydrolyze into Si-OH, part of the Si-OH is combined with the paper surface protection fiber to fix the hydrophobic group on the front surface of the gypsum board, and the other Si-OH forms a more stable-Si-O-covalent network to cover the front surface of the gypsum board through self-polycondensation, so that the hydrophobic film on the front surface of the gypsum board is finally formed.
It can be seen that the other steps of the method for producing gypsum board do not need any modification, and only an alkali solution mixed with methyl hydrogen silicone oil is smeared on the front surface of the lower facing paper 1 before the wet gypsum board is dried, so that the gypsum board with the hydrophobic film formed on the front surface can be obtained.
Preferably:
Before the lower facing 1 passes through the lower facing scoring machine, an alkali solution mixed with methyl hydrogen silicone oil is smeared on the front surface of the lower facing 1.
The position of the alkali solution coated with the methyl hydrogen silicone oil is selected between the lower facing paper deviation rectifying machine and the lower facing paper scoring machine of the gypsum board production line, because the alkali solution is difficult to coat at the scoring position of the lower facing paper 1, and the edge of the lower facing paper 1 of the gypsum board obtained finally is difficult to form a hydrophobic layer, so that the alkali solution needs to be coated before scoring, and the two sides of the scoring position of the lower facing paper 1 can form the hydrophobic layer.
Further, since glue needs to be applied to the top surface of the flange after the upper protective paper stands on the flange, so that the upper protective paper can be adhered to the top surface of the flange, the edges on both sides of the upper protective paper cannot be applied with an alkali solution, otherwise, the adhesion of the glue to the front surface of the lower protective paper 1 is reduced.
In the step of applying the alkali solution mixed with the methyl hydrogen silicone oil to the front surface of the lower facing paper 1, the following conditions are also required:
A blank area 11 with the width of 10 mm-15 mm is reserved on two sides of the lower facing paper 1, and an alkali solution mixed with methyl hydrogen silicone oil is smeared at the position outside the blank area 11.
Since the deviation of the lower facing 1 during the transfer may cause the position of the blank area 11 to be difficult to control, it is also necessary to define the following conditions: after the lower facing paper 1 passes through the lower facing paper deviation corrector, an alkali solution mixed with methyl hydrogen silicone oil is smeared on the front surface of the lower facing paper 1.
Further, since the widths of the lower facing papers 1 of the gypsum boards of different specifications are different, it is necessary to prepare different width application devices for the lower facing papers 1 of different widths.
The application device comprises at least 2 application members 2, the application members 2 being arranged on the transport path of the lower facer paper 1 and being used for applying an alkaline solution on the front side of the lower facer paper 1;
the 2 applicator members 2 are movable in the width direction of the lower facer paper 1 so that edges of the applicator members 2 can be close to one side of the lower facer paper 1 and away from the other side of the lower facer paper 1, projections of the 2 applicator members 2 in the width direction of the lower facer paper 1 are offset from each other, and projections of the 2 applicator members 2 in the length direction of the lower facer paper 1 are partially overlapped, so that the 2 applicator members 2 can be applied from the middle of the lower facer paper 1 to one side of the lower facer paper 1, respectively, and the application is repeated in the middle of the lower facer paper 1.
If the width of the gypsum board with the largest specification is 2 times or more than the width of the gypsum board with the smallest specification, the 2 coating parts 2 are not enough to adapt to the gypsum board with any specification, and operators need to replace the coating parts 2 with different lengths to adapt to the change of the width of the gypsum board, or expand the number of the coating parts 2 to 3 or more.
When the application device comprises 3 application members 2, of which 1 application member 2 is fixed in the middle of the lower facer paper 1 and symmetrical with respect to the centre line of the lower facer paper 1, the other 2 application members 2 are located on both sides of the application member 2, respectively.
The above embodiments may also be differentiated into further embodiments, such as:
The application device comprises 3 application members 2; wherein 1 applicator member 2 is fixed in the middle of the lower facing 1 and symmetrical with respect to the centre line of the lower facing 1; the other 2 applicator members 2 are located on both sides of the applicator member 2, respectively, and each of the 2 applicator members 2 is movable in the width direction of the lower face guard 1, and projections in the width direction of the lower face guard 1 are overlapped with each other.
Thus, in many embodiments, the applicator member 2 need only fulfil the following conditions:
the entire width of the plurality of application members 2 in the width direction of the lower face guard 1 is adjustable, and the plurality of application members 2 do not interfere with each other when the entire width is adjusted.
The applicator member 2 may be a conventional means for applying a liquid to the surface of the product, such as a cloth 21, brush, roller brush, spray gun 3, etc., and the alkaline solution may be transferred quantitatively to the cloth 21, brush, roller brush or spray gun 3 through a pipe.
The following preferred technical means are adopted in this embodiment.
The application device includes: a spray gun 3 and a linear drive;
A plurality of spray guns 3 are arranged side by side at equal intervals along the width direction of the lower facing paper 1, each spray gun 3 is connected with an alkali solution source, and each spray gun 3 can be independently opened to spray the alkali solution to the surface of the lower facing paper 1;
the number of the linear drivers is at least 2, the 2 linear drivers are respectively connected with 1 smearing part 2, the driving direction of the linear drivers is parallel to the width direction of the lower facial tissue 1, and when the number of the smearing parts 2 is 3, the smearing part 2 positioned in the middle does not need the driving of the linear drivers.
Specifically, the linear driver adopts the servo slipway 4.
Each spray gun 3 is connected to a pipe 5 through which the alkali solution flows by means of a separate solenoid valve 31, and the alkali solution may be stored in a tank (not shown) connected to the pipe 5 and located at a high level so that the pressure inside the pipe 5 is such that the alkali solution can be sprayed through the spray gun 3.
The applicator member 2 comprises: a wiper 21 and an elastic plate 22; the rag 21 is fixedly connected with the elastic plate 22, the connection part of the elastic plate 22 and the rag 21 is rectangular, the edge of the rag 21 exceeds the edge of the elastic plate 22, and the rag 21 always clings to the surface of the lower facing paper 1 under the rebound action of the elastic plate 22.
When the size of the gypsum board is changed, the electromagnetic valve 31 is selectively opened and closed to change the spraying width of the spray gun 3, and meanwhile, the servo sliding table 4 drives the elastic plate 22 to move, so that after the alkali solution sprayed by the spray gun 3 passes through the trowelling of the rag 21, the part except the blank area 11 on the two sides of the lower facing paper 1 is just covered.
Further, since at least 2 applicator members 2 are asymmetric with respect to the center line of the lower facer paper 1, each applicator member 2 causes the lower facer paper 1 to deflect toward one side when applying the alkaline solution to the front side of the lower facer paper 1, resulting in the lower facer paper 1 being deflected again.
To solve this problem, a device capable of preventing the applying member 2 from applying a force to bias the lower facestock 1, or a lower facestock deviation corrector (not shown) is added between the applying device and the lower facestock scoring machine.
Wherein the means for preventing the applicator member 2 from exerting a force on the lower facing 1 that deflects it comprise: the support component is arranged on one surface of the lower facial tissue 1, which is opposite to the smearing component 2, and is used for supporting the back surface of the lower facial tissue 1, so that when the smearing component 2 applies acting force to the front surface of the lower facial tissue 1, the support component applies reverse acting force, and the two acting forces counteract each other to avoid the lower facial tissue 1 from generating offset.
The supporting member may be a roller, a smooth metal plate, or the like, which does not damage the lower face guard 1 when rubbed against the back surface of the lower face guard 1.
The following preferred technical means are adopted in this embodiment.
The means for preventing the applicator member 2 from exerting a force on the lower facing 1 that deflects it comprise: the conveying surface of the belt conveyor 6 is attached to the back surface of the lower facing paper 1, the conveying speed of the belt conveyor 6 is in the same direction and at the same speed as the linear speed of the lower facing paper 1, and the width of the conveying surface of the belt conveyor 6 is larger than the width of the lower facing paper 1.
Further, in order to ensure that the conveyance speed of the belt conveyor 6 is the same as the linear speed of the lower face guard 1, in this embodiment, the linear speed of the lower face guard 1 is also detected by the color sensor 7, the color sensor 7 is installed between the lower face guard deviation correcting machine and the belt conveyor 6 of the belt conveyor 6, and the detection end of the color sensor 7 faces the front face of the lower face guard 1, and the color sensor 7 is used to detect the print pattern of the front face of the lower face guard 1.
The printed pattern is printed on the surface of the lower facing sheet 1 by a printing roller before passing through a deviation correcting machine, the printed pattern is usually the name, specification and batch of gypsum board manufacturer, and a color sensor 7 is usually arranged in the middle of the lower facing sheet 1 and senses that the color is black.
The controller calculates the linear velocity of the lower facing paper 1 according to the interval time of the occurrence of the adjacent 2 printing patterns, and then adjusts the transport velocity of the belt conveyor 6 so that the transport velocity of the belt conveyor 6 is equal to the linear velocity of the lower facing paper 1, and no relative movement is generated between the transport surface of the belt conveyor 6 and the lower facing paper 1, so that no relative friction is generated.
The operator may also use a photoelectric encoder for detecting the rotation speed of the roller shaft for transporting the lower facer paper 1 instead of the color sensor 7, and further calculate the linear speed of the lower facer paper 1 through the controller, but the calculation result is not accurate, and there is a problem of slipping between the lower facer paper 1 and the roller shaft.
The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent arrangements of this invention will occur to those skilled in the art, and it is intended to be within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for preparing a hydrophobic film on the surface of a gypsum board is characterized in that,
Comprising the following steps: and (3) smearing an alkali solution mixed with methyl hydrogen silicone oil on the front surface of the lower facing paper, and then drying the wet gypsum board.
2. The method for preparing a hydrophobic film on the surface of a gypsum board according to claim 1, wherein,
And after the lower facing paper passes through the lower facing paper deviation corrector, smearing the alkaline solution on the front surface of the lower facing paper.
3. A method for preparing a hydrophobic film on the surface of a gypsum board according to claim 2, wherein,
The alkaline solution is smeared on the front surface of the lower facing before the lower facing passes through the lower facing scoring machine.
4. A method for preparing a hydrophobic film on the surface of a gypsum board according to claim 3,
And a second lower facial mask paper deviation rectifying machine is added between the lower facial mask paper deviation rectifying machine and the lower facial mask paper scoring machine, and after the alkaline solution is smeared on the front surface of the lower facial mask paper, the lower facial mask paper passes through the second lower facial mask paper deviation rectifying machine.
5. The method for preparing a hydrophobic film on the surface of a gypsum board according to claim 1, wherein,
And a blank area with the width of 10 mm-15 mm is reserved on two sides of the front surface of the lower facing paper, and the alkali solution is smeared at the position outside the blank area.
6. The method for preparing a hydrophobic film on a surface of a gypsum board as claimed in claim 5, wherein,
The step of smearing the alkali solution mixed with the methyl hydrogen silicone oil on the front surface of the lower protective facial tissue comprises the following steps:
spraying the alkali solution on the front surface of the lower facial tissue by using a spray gun;
The alkali solution attached to the front side of the lower facing paper is smoothed out using a spreading member.
7. The method for preparing a hydrophobic film on a surface of a gypsum board as claimed in claim 6, wherein,
The number of the spray guns is a plurality, the spray guns are arranged side by side at equal intervals along the width direction of the lower facing paper, and each spray gun can be independently opened or closed;
The number of the coating parts is at least 2, a plurality of the coating parts form a continuous and uninterrupted coating area in the width direction of the lower facial mask, and the position of at least 1 coating part in the width direction of the lower facial mask can be adjusted to change the whole width of the coating area;
The step of spraying the alkali solution on the front surface of the lower facing paper by using a spray gun comprises the following steps: selectively opening part of the spray gun to enable the alkali solution sprayed by the spray gun on the lower facing paper to avoid a blank area;
The step of trowelling the alkali solution attached to the front side of the lower facer using the applicator member comprises: the position of the coating part is adjusted to change the whole width of the coating area, so that the edge of the coating area is attached to the edge of the blank area.
8. The method for preparing a hydrophobic film on a surface of a gypsum board according to claim 7, wherein,
The step of smearing the alkali solution mixed with the methyl hydrogen silicone oil on the front surface of the lower protective facial tissue further comprises the following steps:
And a supporting component is arranged on one surface of the lower facial tissue facing away from the smearing component, the supporting component comprises a smooth line or surface for supporting the back surface of the lower facial tissue, and the acting force applied on the front surface of the lower facial tissue by the smearing component is counteracted by using the supporting component.
9. The method for preparing a hydrophobic film on a surface of a gypsum board according to claim 7, wherein,
The step of smearing the alkali solution mixed with the methyl hydrogen silicone oil on the front surface of the lower protective facial tissue further comprises the following steps:
And a belt conveyor is arranged on one surface of the lower facial tissues facing away from the smearing part, the transmission surface of the belt conveyor is attached to the back surface of the lower facial tissues, the transmission speed of the belt conveyor is in the same direction and same speed as the linear speed of the lower facial tissues, and the width of the transmission surface of the belt conveyor is larger than that of the lower facial tissues.
10. The method for preparing a hydrophobic film on a surface of a gypsum board according to claim 9, wherein,
The step of smearing the alkali solution mixed with the methyl hydrogen silicone oil on the front surface of the lower protective facial tissue further comprises the following steps:
And detecting the printed patterns on the front surface of the lower facing paper by using a color sensor, calculating the linear speed of the lower facing paper according to the interval time of the occurrence of the adjacent 2 printed patterns, and then adjusting the transmission speed of the belt conveyor so that the transmission speed of the belt conveyor is equal to the linear speed of the lower facing paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410004427.2A CN117986034A (en) | 2024-01-02 | 2024-01-02 | Method for preparing hydrophobic film on surface of gypsum board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410004427.2A CN117986034A (en) | 2024-01-02 | 2024-01-02 | Method for preparing hydrophobic film on surface of gypsum board |
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| CN117986034A true CN117986034A (en) | 2024-05-07 |
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| CN202410004427.2A Pending CN117986034A (en) | 2024-01-02 | 2024-01-02 | Method for preparing hydrophobic film on surface of gypsum board |
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