A method and device for online film formation on the surface of gypsum board

Abstract

The present invention provides an online film-forming method and device on the surface of a paper-faced gypsum board, and relates to the technical field of gypsum board production machinery, comprising a lower workbench and an upper workbench, wherein an outer folding paper roller is rotatably installed in the groove on a fixed axis, and the outer folding paper rollers on both sides respectively cooperate with the inner folding paper rollers correspondingly arranged on the same side, and the upper workbench is located between the outer folding paper roller and the inner folding paper roller and is also equipped with a bending roller frame, and the bending roller frames on both sides are used to perform secondary inward folding on the two side bending parts of the lower face paper, and the lower workbench is provided with injection holes arranged in an array, and the upper workbench pumps adhesive to the outer folding parts at both ends of the lower face paper through an adhesive pumping pipe. As a part of the face paper bending mechanism, the present invention realizes the film-forming operation on the face paper, and is also used to assist in the folding of the face paper, and the addition of film liquid can also significantly reduce the wrinkles generated on the face paper during the folding process, thereby improving the quality of the face paper molding.

Description

Technical Field

[0001] The present invention relates to the technical field of gypsum board production machinery, in particular to an online film-forming method and device for the surface of a paper-faced gypsum board. Background Art

[0002] The prior art discloses an online film-forming system for a paper-faced gypsum board surface, disclosed in publication number "CN117984411A," comprising a coating device and a dryer. The dryer is used to dry the wet gypsum board. The coating device is used to apply an alkaline solution mixed with methyl hydrogen silicone oil to the front surface of the lower face paper before the wet gypsum board is dried. The alkaline solution mixed with methyl hydrogen silicone oil, which contains multiple chemically active Si-H groups, is applied to the front surface of the lower face paper. The wet gypsum board is then dried. During the alkaline drying process of the paper-faced gypsum board, unhydrolyzed Si-H groups react with water molecules evaporated from the board core to form Si-OH groups. Some of the Si-OH groups bind to the face paper fibers, fixing the hydrophobic groups to the front surface of the gypsum board. The remaining Si-OH groups undergo self-condensation to form a more stable -Si-O- covalent network that covers the front surface of the gypsum board, forming a hydrophobic film on the front surface of the gypsum board.

[0003] However, the above-mentioned device still has obvious defects during use: the above-mentioned device is arranged in front of the scoring and folding mechanism of the face paper, and its function is only to perform film-forming operations on the surface of the face paper. Its function is relatively simple and the correlation between the structures is not high, so its degree of integration is not high. At the same time, the above-mentioned film-forming method is used to perform film-forming operations on the bottom of the entire face paper. Since the face paper needs to be folded in the subsequent process, and the folded area does not need to be film-formed, the above-mentioned film-forming method will cause waste of film-forming raw materials. Summary of the Invention

[0004] The object of the present invention is to provide a method and device for online film formation on the surface of a gypsum board, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The folding rollers on both sides are used for folding the two ends of the lower protective paper in a second manner, so that the folding rollers on both sides are in a folded state, and the folding rollers on both sides are fixed on the upper working table.

[0007] A gap is formed between the bottom surface of the lower face paper and the upper surface of the lower workbench. Injection holes are arranged in an array in the lower workbench. The injection holes are connected to the injection pump through a confluence channel. The injection pump pumps film liquid into the injection holes, thereby filling the gap between the lower face paper and the lower workbench. During the conveying process of the lower face paper, the bottom of the lower face paper comes into contact with the film liquid, so that the film liquid is coated on one side of the bottom surface, thereby forming a base film on the bottom of the lower face paper.

[0008] The upper workbench is located in the area between the bending roller frame and the enclosure block and is also provided with an adhesive pumping pipe, through which adhesive is pumped to the outward folding parts at both ends of the lower face paper, thereby forming an adhesive film on the outward folding parts at both ends of the lower face paper.

[0009] Preferably, the adhesive pumping pipe is connected to the adhesive placement cabin fixedly installed on the upper workbench, and a one-way air inlet piston cylinder is installed on one side of the adhesive placement cabin, and the piston arm of the one-way air inlet piston cylinder is connected to the eccentric shaft arranged to rotate with a fixed axis on the same side, and the eccentric shaft is fixedly connected to the roller shaft of the inner folding roller on the same side. The rotation of the inner folding roller forces the gas to enter the adhesive placement cabin in one direction, and the air pressure in the adhesive placement cabin increases, so that the adhesive stored inside is pumped out through the adhesive pumping pipe and falls into the outer folding parts at both ends of the lower face paper.

[0010] Preferably, the enclosing blocks on both sides are located above the outer folding roller and are further provided with a liquid level control channel, and a first pump is further provided on the liquid level control channel, and the first pump is also connected to the liquid collecting tank through the channel, and the liquid collecting tank is connected to the adhesive placement tank through a pipeline, and a second pump is further provided on the pipeline between the liquid collecting tank and the adhesive placement tank.

[0011] Preferably, the lower workbench and the upper workbench are arranged after the lower face paper scoring machine of the gypsum board production line.

[0012] Preferably, the lower workbench, the upper workbench and their connected components are used as part of the lower facing paper folding mechanism.

[0013] Preferably, a coating mechanism and a drying mechanism are further provided at the rear end of the lower facing paper in the conveying direction of the outer folding roller and the inner folding roller, so that the film layer is made uniform and formed through the coating mechanism and the drying mechanism.

[0014] An on-line film forming method for the surface of a gypsum board includes the following steps:

[0015] Step 1: Convey the lower facing paper towards the side close to the lower workbench and the upper workbench. Before reaching the lower workbench and the upper workbench, form creases on the lower facing paper through the provided crease line wheels.

[0016] Step 2: Before reaching the lower workbench and the upper workbench, fold the lower facing paper along the crease line through the lower facing paper folding mechanism provided at the front end, so that it forms a "U" - shaped cross - section with the opening upwards, and guide the upward - folded part to be folded again and enter the bending roller frame, and clamp the inner and outer sides of both ends of the lower facing paper through the outer folding roller and the inner folding roller.

[0017] Step 3: Pump the film liquid from the injection hole into the separation gap through the liquid injection pump machine. The bottom of the lower facing paper contacts the film liquid during the conveying process, so that it adheres to the bottom of the lower facing paper. At the same time, pump adhesive to the outward - folded parts at both ends of the lower facing paper through the adhesive pump injection pipe.

[0018] Step 3: As the lower facing paper continues to be conveyed backward, the inward - folded parts on both sides continue to be folded under the drive of the lower facing paper folding mechanism to form a vertical angle with the upward - folded parts at both ends. At this time, the bottom film and the adhesive film are formed through the coating mechanism and the drying mechanism.

[0019] Step 4: Pour liquid gypsum slurry evenly into the folded and formed lower facing paper, and paste the upper facing paper on the opening side of the lower facing paper, so as to finally form a continuous gypsum board, which is formed after later cutting.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] As part of the facing paper folding mechanism, on the one hand, the present invention realizes the film forming operation of the facing paper, on the other hand, it is also used to assist in the folding of the facing paper, and the addition of the film liquid can significantly reduce the wrinkles generated on the facing paper during the crease folding process, thereby improving the forming quality of the facing paper and at the same time improving the integration degree of the device. BRIEF DESCRIPTION OF THE DRAWINGS [[ID=G]] [[ID=H]]

[0022] [[ID=I]] Figure 1 It is a schematic cross - sectional view of the overall structure of the present invention;

[0023] Figure 2 This is a process flow chart of the protective panel forming process of the present invention;

[0024] Figure 3 Schematic diagram of the film forming position of the present invention.

[0025] In the figure: 1 lower workbench, 2 upper workbench, 3 blocking block, 4 groove, 5 outer folding roller, 6 inner folding roller, 7 rotating shaft, 8 lower face paper, 9 bending roller frame, 10 phase gap, 11 liquid injection hole, 12 confluence channel, 13 liquid injection pump, 14 bottom film, 15 adhesive pump injection pipe, 16 adhesive film, 17 adhesive placement cabin, 18 one-way air intake piston cylinder, 19 piston arm, 20 eccentric shaft, 21 liquid level control channel, 22 first pump, 23 liquid collecting cabin, 24 second pump, 25 upper face paper, 26 crease line wheel. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1-3 , the present invention provides a technical solution: Example 1:

[0028] The folding rollers 3 on both sides are used for folding the bent parts of the two sides of the lower face paper 8 for a second time, so that the two ends of the lower face paper 8 form an inner folding angle with a range of 30° to 45°.

[0029] A gap 10 is formed between the bottom surface of the lower face paper 8 and the upper surface of the lower workbench 1. Liquid injection holes 11 are arranged in an array in the lower workbench 1. The liquid injection holes 11 are connected to a liquid injection pump 13 through a conduit 12. The liquid injection pump 13 pumps film liquid into the liquid injection holes 11, thereby filling the gap 10 between the lower face paper 8 and the lower workbench 1. During the conveyance of the lower face paper 8, the bottom of the lower face paper 8 comes into contact with the film liquid, so that the film liquid is coated on one side of the bottom surface, thereby forming a base film 14 on the bottom of the lower face paper 8.

[0030] An adhesive pumping pipe 15 is also provided in the area between the bending roller frame 9 and the enclosure block 3 on the upper workbench 2, through which adhesive is pumped to the outward folded parts at both ends of the lower face paper 8, thereby forming an adhesive film 16 on the outward folded parts at both ends of the lower face paper 8.

[0031] In this embodiment, the lower workbench 1 and the upper workbench 2 serve as the main structure of the device. The lower workbench 1 and the upper workbench 2 are arranged behind the scoring machine for the lower facing paper of the gypsum board production line. On both sides of the lower workbench 1, there are installed enclosing blocks 3. Inside the enclosing blocks 3 on both sides, there are outer folding paper rollers 5. The outer folding paper rollers 5 also correspond and cooperate with the inner folding paper rollers 6 arranged on the same side. By clamping with the outer folding paper rollers 5 and the inner folding paper rollers 6 on both sides, the lower facing paper 8 forms a "U"-shaped cross-section with the opening facing upward. Among them, between the outer folding paper rollers 5 and the inner folding paper rollers 6 on the upper workbench 2, there is also installed a bending roller frame 9. The bending roller frames 9 on both sides are used to perform secondary inner folding on the bent parts on both sides of the lower facing paper 8, so that the two ends of the lower facing paper 8 form an inner folding angle within the range of 30° - 45° with the horizontal plane. This step is an essential step for the lower facing paper 8 to be folded from a flat state to a three-dimensional state. Therefore, this device is used as part of the bending mechanism for the lower facing paper, but its function is not limited to folding the lower facing paper 8 only. There is a separation gap 10 formed between the bottom surface of the lower facing paper 8 and the upper surface of the lower workbench 1. In the lower workbench 1, there are injection holes 11 arranged in an array. During the conveying process of the lower facing paper 8, the bottom of the lower facing paper 8 contacts with the film liquid, so as to coat the film liquid on one side of the bottom surface, thereby forming a bottom film 14 on the bottom of the lower facing paper 8. Different from the prior art, this method of coating the film liquid does not need to cover the entire bottom surface of the lower facing paper 8, and only needs to coat the bottom surface after folding, so it is more energy-saving and environmentally friendly than the traditional coating method. At the same time, since the upper surface of the upward-folding structure of the lower facing paper 8 also needs to be adhesively bonded to the upper facing paper 25, the traditional production line also needs to coat an adhesive film layer at this position before bonding. Therefore, this device is also provided with an adhesive pump injection pipe 15. Through the adhesive pump injection pipe 15, adhesive is pumped into the outer-folded parts at both ends of the lower facing paper 8, thereby forming an adhesive film 16 at the outer-folded parts at both ends of the lower facing paper 8. In addition, such a setting can also bring other benefits. In the prior art, in order to prevent wrinkles at the crease line position during the bending process of the lower facing paper 8, an aqueous solution is rolled on the coating position of the adhesive film 16, so as to prevent wrinkles from being generated during the rolling process of the roller. And the application of the adhesive by pumping through the adhesive pump injection pipe 15 effectively solves the above problem, so that there is no need to set up corresponding structures at the conveying rear end. To sum up, the above device is used as part of the facing paper bending mechanism, but further realizes the function of film formation. The film formation process is energy-saving and environmentally friendly, and can further ensure the folding quality at the crease position, thus achieving more diverse technical effects, and the integration degree of the device is higher. Embodiment Two:

[0032] The adhesive pumping pipe 15 is connected to the adhesive placement cabin 17 fixedly installed on the upper workbench 2. A one-way air inlet piston cylinder 18 is installed on one side of the adhesive placement cabin 17. The piston arm 19 of the one-way air inlet piston cylinder 18 is connected to the eccentric shaft 20 set to rotate on the same side. The eccentric shaft 20 is fixedly connected to the roller shaft of the inner folding roller 6 on the same side. The rotation of the inner folding roller 6 forces the gas to enter the adhesive placement cabin 17 in one direction. The air pressure in the adhesive placement cabin 17 increases, thereby pumping the adhesive stored inside out through the adhesive pumping pipe 15 and falling into the outer folding parts at both ends of the lower face paper 8.

[0033] In this embodiment, a pumping device of the adhesive pumping tube 15 is further disclosed. By setting it so that the interior of the adhesive pumping tube 15 is in a sealed state, the eccentric shaft 20 is driven to rotate during the rotation of the inner paper folding roller 6. The rotation of the eccentric shaft 20 drives the piston arm 19 of the one-way air intake piston cylinder 18 to extend and retract. The structure of the one-way air intake piston cylinder 18 is similar to the common air pump structure in the prior art. The piston arm 19 is extended and retracted to inflate the adhesive placement chamber 17. The air pressure in the adhesive placement chamber 17 increases, thereby pumping the adhesive stored inside out through the adhesive pumping tube 15. Example 3:

[0034] The enclosing blocks 3 on both sides are located above the outer paper folding roller 5 and are also provided with a liquid level control channel 21. A first pump 22 is also provided on the liquid level control channel 21. The first pump 22 is also connected to the liquid collecting tank 23 through the channel. The liquid collecting tank 23 is connected to the adhesive placement tank 17 through a pipeline. A second pump 24 is also provided on the pipeline between the liquid collecting tank 23 and the adhesive placement tank 17.

[0035] In this embodiment, the enclosing blocks 3 on both sides are located above the outer folding roller 5 and are further provided with a liquid level control channel 21. The adhesive overflowing the liquid level control channel 21 will enter the liquid collecting tank 23 under the action of the first pump 22, thereby preventing excessive addition of adhesive. In addition, the adhesive collected in the liquid collecting tank 23 can also enter the adhesive placement tank 17 through the second pump 24, thereby preventing waste of adhesive. Example 4:

[0036] The lower face paper 8 is located at the rear end of the outer folding roller 5 and the inner folding roller 6 in the conveying direction and is also provided with a coating mechanism and a drying mechanism, through which the film layer is made uniform and formed.

[0037] After applying the adhesive and film liquid, it is necessary to scrape the corresponding adhesion area of ​​the lower protective paper 8 with a scraper or a smear brush to make it more evenly distributed. At the same time, the drying mechanism is set to promote rapid film formation. The above device is a common structure in the prior art and will not be described in detail here.

[0038] An on-line film-forming method for the surface of a paper-faced gypsum board, comprising the following steps:

[0039] Step 1: Convey the lower facing paper 8 towards the side close to the lower workbench 1 and the upper workbench 2. Before reaching the lower workbench 1 and the upper workbench 2, form a crease on the lower facing paper 8 through the provided crease line wheel 26.

[0040] Step 2: Before reaching the lower workbench 1 and the upper workbench 2, fold the lower facing paper 8 along the crease line through the lower facing paper folding mechanism provided at the front end, so that it forms a "U"-shaped cross-section with the opening facing upwards, and guide the folded-up part to be folded again and enter the bending roller frame 9, and clamp the inner and outer sides of both ends of the lower facing paper 8 through the outer folding roller 5 and the inner folding roller 6.

[0041] Step 3: Pump the film liquid from the liquid injection hole 11 into the separation gap 10 through the liquid injection pump 13. The bottom of the lower facing paper 8 contacts the film liquid during the conveyance process, so as to adhere to the bottom of the lower facing paper 8. At the same time, pump the adhesive into the outer folded parts at both ends of the lower facing paper 8 through the adhesive pump injection pipe 15.

[0042] Step 3: As the lower facing paper 8 continues to be conveyed towards the rear end, the inner folded parts on both sides continue to be folded under the drive of the lower facing paper folding mechanism so as to form a vertical angle with the parts folded upwards at both ends. At this time, the bottom film 14 and the adhesive film 16 are formed through the coating mechanism and the drying mechanism.

[0043] Step 4: Uniformly pour the liquid gypsum slurry into the folded lower facing paper 8, and attach the upper facing paper 25 to the opening side of the lower facing paper 8, so as to finally form a continuous gypsum board, which is formed after later cutting.

[0044] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An online film-forming device for the surface of a gypsum board, comprising a lower workbench and an upper workbench, characterized in that: On both sides of the lower workbench, there are fixedly connected retaining blocks. On the side of the two retaining blocks close to the lower workbench, grooves are provided. An outer folding paper roller is rotatably installed on a fixed shaft in the groove. The two outer folding paper rollers on both sides cooperate with the corresponding inner folding paper rollers on the same side. The inner folding paper rollers are fixedly installed on the upper workbench through rotating shafts. The two outer folding paper rollers and inner folding paper rollers on both sides clamp both sides of the lower facing paper, so that the lower facing paper forms a "凵"-shaped cross-section with the opening facing upward. Between the outer folding paper roller and the inner folding paper roller on the upper workbench, a bending roller frame is also installed. The two bending roller frames are used to perform secondary inner folding on the bent parts on both sides of the lower facing paper, so that the two ends of the lower facing paper form an inner folding angle in the range of 30°-45° with the horizontal plane; A separated gap is formed between the bottom surface of the lower facing paper and the upper surface of the lower workbench. Liquid injection holes are arranged in an array in the lower workbench. The liquid injection holes are communicated with a liquid injection pump through a confluence channel. The liquid injection pump pumps film liquid into the liquid injection holes, so as to fill the separated gap between the lower facing paper and the lower workbench. During the transmission of the lower facing paper, the bottom of the lower facing paper contacts with the film liquid, so as to coat the film liquid on one side of the bottom surface, so as to form a bottom film on the bottom of the lower facing paper; In the area between the bending roller frame and the retaining block on the upper workbench, an adhesive pump injection pipe is also provided. Through the adhesive pump injection pipe, adhesive is pumped into the outer folded parts at both ends of the lower facing paper, so as to form an adhesive film on the outer folded parts at both ends of the lower facing paper.

2. The on-line film-forming device for the surface of a gypsum board according to claim 1, characterized in that: The adhesive pump injection pipe is communicated with an adhesive placement chamber fixedly installed on the upper workbench. A one-way intake piston cylinder is installed on one side of the adhesive placement chamber. The piston arm of the one-way intake piston cylinder is connected with an eccentric shaft rotatably arranged on the same side. The eccentric shaft is fixedly connected with the roller shaft of the inner folding paper roller on the same side. By the rotation of the inner folding paper roller, gas is forced to enter the adhesive placement chamber unidirectionally. The air pressure in the adhesive placement chamber increases, so as to pump the stored adhesive in the chamber outwards through the adhesive pump injection pipe and fall into the outer folded parts at both ends of the lower facing paper.

3. An online film-forming device for the surface of a gypsum board according to claim 1 or 2, characterized in that: On the upper part of the two retaining blocks above the outer folding paper roller, a liquid level control channel is also provided. A first pump is also arranged on the liquid level control channel. The first pump is also communicated with a liquid collection chamber through a channel. The liquid collection chamber is communicated with the adhesive placement chamber through a pipeline. A second pump is also arranged on the pipeline between the liquid collection chamber and the adhesive placement chamber.

4. The on-line film-forming device for the surface of a gypsum board according to claim 3, characterized in that: The lower workbench and the upper workbench are arranged after the lower facing paper creasing machine of the gypsum board production line.

5. The on-line film-forming device for the surface of a gypsum board according to claim 4, characterized in that: The lower workbench, the upper workbench and the components connected thereto are used as a part of the lower facing paper bending mechanism.

6. The on-line film-forming device for the surface of a gypsum board according to claim 1, characterized in that: At the rear end of the lower facing paper in the transmission direction of the outer folding paper roller and the inner folding paper roller, a coating mechanism and a drying mechanism are also provided. Through the coating mechanism and the drying mechanism, the film layer is made uniform and formed.

7. A method for forming a film on the surface of a gypsum board online, using the device for forming a film on the surface of a gypsum board as claimed in claim 6, characterized in that: Including the following steps: Step 1: Transmit the lower facing paper towards the side close to the lower workbench and the upper workbench. Before reaching the lower workbench and the upper workbench, creases are formed on the lower facing paper through the provided crease line wheels; Step 2: Before reaching the lower workbench and the upper workbench, the lower facing paper is folded along the crease line by the lower facing paper folding mechanism provided at the front end, so that it forms a "凵"-shaped cross-section with the opening facing upward, and the upwardly folded part is guided to be folded again and enter the bending roller frame, and the inner and outer sides of both ends of the lower facing paper are clamped by the outer folding paper roller and the inner folding paper roller; Step 3: The membrane liquid is pumped into the separation gap from the liquid injection hole by the liquid injection pump machine. The bottom of the lower facing paper contacts the membrane liquid during the conveying process, so that it adheres to the bottom of the lower facing paper. At the same time, the adhesive is pumped into the outer folded parts at both ends of the lower facing paper through the adhesive pump injection pipe; Step 3: As the lower facing paper continues to be conveyed backward, the inner folded parts on both sides are continuously folded under the drive of the lower facing paper folding mechanism to form a vertical angle with the upwardly folded parts at both ends. At this time, the bottom film and the adhesive film are formed through the coating mechanism and the drying mechanism; Step 4: The liquid gypsum slurry is evenly poured into the bent and formed lower facing paper, and the upper facing paper is attached to the open side of the lower facing paper, so as to finally form a continuous gypsum board, which is formed after being cut in the later stage.

Images