A board for adsorbing formaldehyde and a preparation method thereof

Abstract

The application discloses a kind of plate for adsorbing formaldehyde, including first face layer, second face layer and composite layer, the composite layer includes first absorption layer, second absorption layer, first buffer cavity, second buffer cavity.First absorption layer and second absorption layer are set, and first buffer layer is set to provide space for first absorption layer and second absorption layer to cooperate, first absorption layer is entered into second absorption layer for re-adsorption after preliminary absorption, improve the adsorption effect of formaldehyde, effectively reduce the formaldehyde content in external air;Second buffer cavity is set for second absorption layer to adsorb formaldehyde, trace gas is discharged to second buffer cavity, this setting reduces the formaldehyde content of second buffer cavity, improves the absorption effect of second absorption layer;At the same time, after spraying hot melt adhesive, feeding, laminating filter cloth, turning over, applying hot melt adhesive again, feeding, laminating filter cloth, this kind of production mode can be continuous production, improve production efficiency.

Description

Technical Field

[0001] This invention relates to the field of building materials, and more specifically, to a formaldehyde-absorbing board and its preparation method. Background Technology

[0002] In home design, non-load-bearing walls are often constructed using panels to divide space. Different assembly methods are used to separate rooms with different functions to improve comfort. Current designs primarily use plastic panels, wood, and composite panels. Plastic panels, due to the solvents and fillers used in their manufacturing process, are prone to aging due to exposure to sunlight and wind, releasing toxic and harmful gases known as VOCs. Wood, being naturally occurring and relatively easy to manufacture, is prone to becoming brittle and moldy after prolonged use. Due to these limitations, composite panels are currently the most common building material used in homes for space division. However, after renovation, other furniture emits formaldehyde and other harmful substances, and current composite panels cannot effectively absorb this formaldehyde, negatively impacting the home experience.

[0003] In summary, based on the applicant's extensive research, at least one technical problem exists in this field: existing composite boards cannot adsorb formaldehyde. Therefore, it is necessary to develop or improve a formaldehyde-adsorbing board and its preparation method. Summary of the Invention

[0004] Therefore, in order to solve the problem that existing composite boards cannot adsorb formaldehyde, this invention provides a formaldehyde-adsorbing board and its preparation method, the specific technical solution of which is as follows:

[0005] A formaldehyde-absorbing board includes a first panel, a second panel, and a composite layer disposed between the first panel and the second panel. The composite layer includes a first absorption layer, a second absorption layer disposed below the first absorption layer, a first buffer cavity disposed between the first absorption layer and the second absorption layer, and a second buffer cavity disposed between the second absorption layer and the second panel.

[0006] Furthermore, the first panel is provided with multiple rows of through holes that are connected to the first absorption layer.

[0007] Furthermore, a first spacer strip is provided between the first absorbent layer and the second absorbent layer.

[0008] Furthermore, a second spacer strip is provided between the second absorbent layer and the second panel.

[0009] Furthermore, a support mesh is provided between the second pad and the second absorbent layer.

[0010] Furthermore, a groove is provided on one side of the first panel.

[0011] This technical solution also provides a method for preparing formaldehyde-adsorbing boards, including the following steps:

[0012] Preparation of the first absorber layer:

[0013] The first filter cloth is placed on the conveyor belt, and hot melt adhesive is sprayed onto the middle of the first filter cloth during its conveying process.

[0014] After the first hot melt adhesive is sprayed, activated carbon is added onto the first filter cloth.

[0015] After feeding is complete, apply a second hot melt adhesive along one side of the first filter cloth.

[0016] After the second hot melt adhesive is applied, the second filter cloth is conveyed above the activated carbon. One side of the second filter cloth along the production forward direction is flush with the side of the first filter cloth on which the second hot melt adhesive was applied. The other side of the second filter cloth along the production forward direction is positioned within the projection plane of the first filter cloth, thus obtaining the first layered structure.

[0017] The first layer of the stacked structure is conveyed to the first pressure roller for pressing.

[0018] After pressing, the first laminated structure is conveyed to the flipping mechanism for flipping, so that the first filter cloth is placed facing upwards.

[0019] Apply a third hot melt adhesive to the first layer of the flipped structure.

[0020] After the third hot melt adhesive is applied, activated carbon is added onto the first filter cloth.

[0021] After the material feeding is completed, a fourth hot melt adhesive is applied along one side of the first filter cloth. The application point of the fourth hot melt adhesive is parallel to the application point of the second hot melt adhesive, and their vertical projections do not overlap.

[0022] After the fourth hot melt adhesive is applied, the third filter cloth is conveyed above the activated carbon. One side of the second filter cloth along the production forward direction is flush with the side of the first filter cloth where the fourth hot melt adhesive is applied. The other side of the third filter cloth along the production forward direction is positioned within the projection plane of the first filter cloth, resulting in a second layered structure.

[0023] The second layer structure is conveyed to the second pressure roller for pressing, and the first absorption layer is obtained after pressing.

[0024] Preparation of the second absorber layer:

[0025] Place the fourth filter cloth on the conveyor belt, and spray the fifth hot melt adhesive onto the middle of the fourth filter cloth during its transport.

[0026] After the fifth hot melt adhesive is sprayed, the fiber is fed onto the fourth filter cloth.

[0027] After feeding is complete, apply the sixth hot melt adhesive along one side of the fourth filter cloth.

[0028] After the sixth hot melt adhesive is applied, the fifth filter cloth is conveyed above the fiber. One side of the fifth filter cloth along the production line's forward direction is flush with the side of the fourth filter cloth where the sixth hot melt adhesive was applied. The other side of the fifth filter cloth along the production line's forward direction is positioned within the projection plane of the fourth filter cloth, resulting in the third layered structure.

[0029] The third layer structure is conveyed to the third pressure roller for pressing, and the second absorption layer is obtained after pressing.

[0030] Preparation of composite boards:

[0031] The first panel, the first absorbent layer, the first pad, the second absorbent layer, the support mesh, the second pad, and the second panel are stacked in sequence. Adhesive is applied to the contact points of each stacked component, and the composite board is obtained by pressing after adhesive application.

[0032] Furthermore, the first laminated structure after pressing is cooled and cured during transportation, with a cooling and curing temperature of 5℃-8℃.

[0033] Furthermore, the second laminated structure after pressing is cooled and solidified during the transport process, with a cooling temperature of 5℃-8℃.

[0034] Furthermore, the width of the second filter cloth is greater than the application width of the first hot melt adhesive, and the width of the second filter cloth is less than the width of the first filter cloth; the width of the third filter cloth is greater than the application width of the third hot melt adhesive, and the width of the third filter cloth is less than the width of the first filter cloth.

[0035] In the above technical solution, the composite layer includes a first absorption layer, a second absorption layer disposed below the first absorption layer, a first buffer cavity disposed between the first and second absorption layers, and a second buffer cavity disposed between the second absorption layer and the second panel. The first and second absorption layers are configured to provide space for the first and second absorption layers to work together. After initial absorption, the first absorption layer enters the second absorption layer for further adsorption, improving the formaldehyde adsorption effect and effectively reducing the formaldehyde content in the outside air. The second buffer cavity is provided so that after the second absorption layer adsorbs formaldehyde, trace amounts of gas are discharged into the second buffer cavity, reducing the formaldehyde content in the second buffer cavity and improving the absorption effect of the second absorption layer. Simultaneously, by spraying hot melt adhesive, feeding, bonding the filter cloth, flipping, applying hot melt adhesive again, feeding, and bonding the filter cloth, this production method allows for continuous production, improving production efficiency. Due to its "S"-shaped adhesive application method, the prepared first or second absorption layer can be cut as needed during use, increasing its flexibility. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the composite board structure of the present invention;

[0037] Figure 2 This is a schematic diagram of the structure of the first surface layer of the present invention;

[0038] Figure 3 This is a schematic diagram of the A-side structure of the first absorption layer of the present invention;

[0039] Figure 4 This is a schematic diagram of the B-side structure of the first absorption layer of the present invention;

[0040] Figure 5 This is a schematic diagram of the structure of the second absorption layer of the present invention;

[0041] Figure 6 This is a schematic diagram of the support mesh structure of the present invention;

[0042] Figure 7 This is a schematic diagram showing the layout of the first absorption layer and the second absorption layer of the present invention;

[0043] Figure 8 This is a schematic diagram of the production process of the first absorption layer of the present invention;

[0044] Figure 9 This is a schematic diagram of the production process of the second absorbent layer of the present invention;

[0045] Figure 10 This is a schematic diagram of the operation process of the flipping mechanism of the present invention. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0048] An embodiment of the present invention provides a formaldehyde-absorbing board, comprising a first panel 1, a second panel 2, and a composite layer disposed between the first panel 1 and the second panel 2. The composite layer includes a first absorption layer 4, a second absorption layer 5 disposed below the first absorption layer 4, a first buffer cavity 6 disposed between the first absorption layer 4 and the second absorption layer 5, and a second buffer cavity 7 disposed between the second absorption layer 5 and the second panel 2.

[0049] In one embodiment, the first panel 1 is provided with multiple rows of through holes 11 that communicate with the first absorption layer 4.

[0050] In one embodiment, a first pad 12 is provided between the first absorbent layer 4 and the second absorbent layer 5.

[0051] In one embodiment, a second pad 13 is provided between the second absorbent layer 5 and the second panel 2.

[0052] In one embodiment, a support mesh 8 is provided between the second pad 13 and the second absorbent layer 5.

[0053] In one embodiment, a groove 14 is provided on one side of the first panel 1.

[0054] This technical solution also provides a method for preparing formaldehyde-adsorbing boards, including the following steps:

[0055] Preparation of the first absorber layer:

[0056] The first filter cloth 41 is placed on the conveyor belt, and the first hot melt adhesive 42 is sprayed onto the middle of the first filter cloth 41 during the conveying process.

[0057] After the first hot melt adhesive 42 is sprayed, activated carbon is added onto the first filter cloth 41.

[0058] After feeding is completed, apply the second hot melt adhesive 43 along one side of the first filter cloth 41.

[0059] After the second hot melt adhesive 43 is applied, the second filter cloth 44 is conveyed above the activated carbon. One side of the second filter cloth 44 along the production forward direction is flush with the side of the first filter cloth 41 where the second hot melt adhesive 42 is applied. The other side of the second filter cloth 44 along the production forward direction is positioned within the projection plane of the first filter cloth 41, resulting in a first layered structure.

[0060] The first layered structure is conveyed to the first pressure roller 81 for pressing.

[0061] After pressing, the first laminated structure is conveyed to the flipping mechanism 88 for flipping, so that the first filter cloth is placed facing upwards.

[0062] Apply a third hot melt adhesive 45 to the first layer of the completed flipping structure.

[0063] After the third hot melt adhesive 45 is applied, activated carbon is added onto the first filter cloth 41.

[0064] After feeding is completed, a fourth hot melt adhesive 46 is applied along one side of the first filter cloth 41. The application point of the fourth hot melt adhesive 46 is parallel to the application point of the second hot melt adhesive 43 and their vertical projections do not overlap.

[0065] After the fourth hot melt adhesive 46 is applied, the third filter cloth 47 is conveyed above the activated carbon. One side of the second filter cloth 44 along the production forward direction is flush with the side of the first filter cloth 41 where the fourth hot melt adhesive 46 is applied. The third filter cloth 47 is positioned within the projection plane of the first filter cloth 41 along the other side of the production forward direction, resulting in a second layered structure.

[0066] The second layer structure is conveyed to the second pressure roller 82 for pressing, and the first absorption layer is obtained after pressing.

[0067] Preparation of the second absorber layer:

[0068] The fourth filter cloth 51 is placed on the conveyor belt, and the fifth hot melt adhesive 52 is sprayed onto the middle of the fourth filter cloth 51 during its transport.

[0069] After the fifth hot melt adhesive 52 is sprayed, the fiber is fed onto the fourth filter cloth 51.

[0070] After feeding is completed, apply the sixth hot melt adhesive 53 along one side of the fourth filter cloth 51.

[0071] After the sixth hot melt adhesive 53 is applied, the fifth filter cloth 54 is conveyed above the fiber. One side of the fifth filter cloth 54 along the production line's forward direction is flush with the side of the fourth filter cloth 51 where the sixth hot melt adhesive was applied. The other side of the fifth filter cloth 51 along the production forward direction is positioned within the projection plane of the fourth filter cloth 54, resulting in a third layered structure.

[0072] The third layer structure is conveyed to the third pressure roller 83 for pressing, and the second absorption layer is obtained after pressing.

[0073] Preparation of composite boards:

[0074] The first panel 1, the first absorbent layer 4, the first pad strip 12, the second absorbent layer 5, the support mesh 8, the second pad strip 13, and the second panel 2 are stacked in sequence. Adhesive is applied to the contact points of each stacked component, and the composite board is obtained by pressing after adhesive application.

[0075] In one embodiment, the first laminated structure after pressing is cooled and cured during transportation, with a cooling and curing temperature of 5°C-8°C.

[0076] In one embodiment, the second laminated structure after pressing is cooled and solidified during transport at a temperature of 5°C-8°C.

[0077] In one embodiment, the width of the second filter cloth 44 is greater than the application width of the first hot melt adhesive 42, and the width of the second filter cloth 44 is less than the width of the first filter cloth 41; the width of the third filter cloth 47 is greater than the application width of the third hot melt adhesive 45, and the width of the third filter cloth 47 is less than the width of the first filter cloth 41.

[0078] In one embodiment, the path of the first hot melt adhesive 42 sprayed is "S" shaped, and the path of the third hot melt adhesive 45 sprayed is "S" shaped, with the projection of the third hot melt adhesive overlapping the application area of ​​the first hot melt adhesive 42.

[0079] In one embodiment, the path of the sprayed fifth hot melt adhesive 52 is "S" shaped.

[0080] In one embodiment, the second hot melt adhesive 43, the fourth hot melt adhesive 46, and the sixth hot melt adhesive 53 are all applied in a straight line along the production forward direction.

[0081] In one embodiment, the feeding of activated carbon onto the first filter cloth 41 is done in an intermittent manner, specifically by feeding the activated carbon at intervals to the feeding area enclosed by the first hot melt adhesive 42 or the third hot melt adhesive 45.

[0082] In one embodiment, the fourth filter cloth 51 is fed in an intermittent manner, specifically, the material is fed intermittently to the feeding area enclosed by the fifth hot melt adhesive 52.

[0083] In one embodiment, the first absorbent layer 4 includes a first filter cloth 41, with an "S"-shaped first hot melt adhesive 42 disposed on one side of the first filter cloth 41, wherein an activated carbon feeding port is disposed between the first hot melt adhesives 42, a second filter cloth 44 is disposed on the first filter cloth 41, and activated carbon is disposed between the first filter cloth 41, the second filter cloth 44, and the first hot melt adhesives 42 and the second hot melt adhesives 43, and a second hot melt adhesive 43 is disposed on one side of the first filter cloth 41 to adhere to the side of the second filter cloth 44; an "S"-shaped third hot melt adhesive 45 is disposed on the other side of the first filter cloth 41, wherein an activated carbon feeding port is disposed between the third hot melt adhesives 45, a third filter cloth 47 is disposed on the first filter cloth 41, and activated carbon is disposed between the first filter cloth 41, the third filter cloth 47, and the third hot melt adhesives 45 and the fourth hot melt adhesive 46, and a fourth hot melt adhesive 46 is disposed on one side of the first filter cloth 41 to adhere to the side of the third filter cloth 47. The first absorption layer 4 is formed into multiple spaced cavity structures, wherein the center line of the cavity structures is wavy, which increases the specific surface area, increases the contact area with the gas, and improves the absorption efficiency.

[0084] In one embodiment, the second absorption layer 5 includes a fourth filter cloth 51, with an "S"-shaped fifth hot melt adhesive 52 disposed on one side of the fourth filter cloth 51. Feeding points for fibers are located between the fifth hot melt adhesives 52. A fifth filter cloth 54 is disposed on the fourth filter cloth 51, and fibers are disposed between the fourth filter cloth 51, the fifth filter cloth 54, and the fifth and sixth hot melt adhesives 52 and 53. This creates multiple spaced-apart cavity structures in the second absorption layer 5, with the cavity structures arranged in a planar, spaced apart. These multiple spaced-apart cavity structures allow the first absorption layer 4 and the second absorption layer 5 to interlock, improving the absorption effect. The smaller absorption layer size facilitates the adsorption of formaldehyde.

[0085] In one embodiment, the other side of the second absorbent layer 5 may also be provided with wrapping fibers. By repeating the flipping, gluing, feeding and pressing processes as in the preparation process of the first absorbent layer 4, a cavity structure with multiple spaced intervals on both sides, as in the first absorbent layer 4, can be formed.

[0086] In one embodiment, a groove 14 is provided on one side of the first panel 1 to facilitate the assembly of the first absorption layer 4.

[0087] In one embodiment, the first panel 1 is provided with multiple rows of through holes 11 that communicate with the first absorption layer 4, and the shape of the through holes 11 includes square, circular and hexagonal.

[0088] In one embodiment, the support mesh 8 is specifically a stainless steel mesh with a mesh size of 1 square centimeter.

[0089] In one embodiment, the layers of the composite board are fixed together by applying hot melt adhesive or glue at the edges.

[0090] In one embodiment, the first pad 12 and the second pad 13 are made of silicone, and the first pad 12 and the second pad 13 are elongated strips.

[0091] In one embodiment, the first filter cloth 41, the second filter cloth 44, and the third filter cloth 47 are all made of PP material with a mesh size of 800-1500 mesh.

[0092] In one embodiment, both the fourth filter cloth 51 and the fifth filter cloth 54 are made of PP material with a mesh size of 120-200.

[0093] In one embodiment, the fiber is specifically a mixture of cotton-type short fibers and wool-type short fibers in a 1:1 weight ratio, wherein the linear density of the cotton-type short fibers is 1.3 dtex-1.7 dtex; and the linear density of the wool-type short fibers is 3.3 dtex-7.7 dtex.

[0094] In one embodiment, the flipping mechanism 88 includes a first roller group 881, a second roller group 882, a third roller group 883, a fourth roller group 884, a fifth roller group 885, and a sixth roller group 886 arranged sequentially. The inclination of the first roller group 881, the second roller group 882, and the third roller group 883 gradually increases until the fourth roller group 884 is completely vertical. The fourth roller group 884, the fifth roller group 885, and the sixth roller group 886 gradually tilt until they are horizontal. This flipping method is simple and easy to implement. Furthermore, when combined with production line operations, multiple roller groups work together to continuously convey and flip the rollers, resulting in high work efficiency.

[0095] In one embodiment, the activated carbon is added intermittently, with the addition of activated carbon stopping at the hot melt adhesive application point and the material being discharged at the non-hot melt adhesive application point; specifically, material is added once every other feeding point.

[0096] In one embodiment, the fiber is added intermittently, with fiber addition stopping at the hot melt adhesive application point and material discharge at the non-hot melt adhesive application point; specifically, material is added once every other feeding point.

[0097] In one embodiment, the third layer structure after pressing is cooled and solidified during transport at a temperature of 5°C-8°C.

[0098] In one embodiment, the second panel 2 is provided with an exhaust vent 21 for switching on and off. Vacuuming through the exhaust vent 21 can remove formaldehyde that has been absorbed by the first absorption layer 4 and the second absorption layer 5, thereby improving the formaldehyde absorption capacity of the composite board for subsequent reuse. This results in a high reuse rate and is more environmentally friendly.

[0099] In the above technical solution, the composite layer includes a first absorbent layer, a second absorbent layer disposed below the first absorbent layer, a first buffer cavity disposed between the first and second absorbent layers, and a second buffer cavity disposed between the second absorbent layer and the second panel. The first and second absorbent layers are configured to provide space for the first and second absorbent layers to work together. After initial absorption by the first absorbent layer, the formaldehyde enters the second absorbent layer for further adsorption, improving the formaldehyde adsorption effect and effectively reducing the formaldehyde content in the outside air. The second buffer layer is used so that after the second absorbent layer adsorbs formaldehyde, a small amount of gas is discharged into the second buffer cavity. This configuration reduces the formaldehyde content in the second buffer cavity and improves the absorption effect of the second absorbent layer. Simultaneously, by spraying hot melt adhesive, feeding, bonding the filter cloth, flipping, applying hot melt adhesive again, feeding, and bonding the filter cloth, this production method allows for continuous production and improves production efficiency. Due to its "S"-shaped adhesive application method, the prepared first or second absorbent layer can be cut as needed during use, increasing its flexibility.

[0100] The implementation schemes of the present invention will now be described in detail with reference to specific embodiments.

[0101] Example 1:

[0102] A formaldehyde-absorbing board includes a first panel 1, a second panel 2, and a composite layer disposed between the first panel and the second panel. The composite layer includes a first absorption layer 4, a second absorption layer 5 disposed below the first absorption layer 4, a first buffer cavity 6 disposed between the first absorption layer 4 and the second absorption layer 5, and a second buffer cavity 7 disposed between the second absorption layer 5 and the second panel 2. The first panel 1 has multiple rows of through holes 11 communicating with the first absorption layer 4. A first spacer strip 12 is disposed between the first absorption layer 4 and the second absorption layer 5. A second spacer strip 13 is disposed between the second absorption layer 5 and the second panel 2. A support mesh 8 is disposed between the second spacer strip 13 and the second absorption layer 5. A groove 14 is disposed on one side of the first panel.

[0103] This technical solution also provides a method for preparing formaldehyde-adsorbing boards, including the following steps:

[0104] Preparation of the first absorber layer:

[0105] The first filter cloth 41 is placed on the conveyor belt, and the first hot melt adhesive 42 is sprayed onto the middle of the first filter cloth 41 during the conveying process.

[0106] After the first hot melt adhesive 42 is sprayed, the activated carbon 9 is added onto the first filter cloth 41.

[0107] After feeding is completed, apply the second hot melt adhesive 43 along one side of the first filter cloth 41.

[0108] After the second hot melt adhesive 43 is applied, the second filter cloth 44 is conveyed above the activated carbon 9. One side of the second filter cloth 44 along the production forward direction is flush with the side of the first filter cloth 41 where the second hot melt adhesive 43 is applied. The other side of the second filter cloth 44 along the production forward direction is positioned within the projection plane of the first filter cloth 41, thus obtaining the first layered structure.

[0109] The first layered structure is conveyed to the first pressure roller 81 for pressing.

[0110] After pressing, the first laminated structure is cooled and cured during transport at a temperature of 5℃-8℃, and then transported to the flipping mechanism 88 for flipping, so that the first filter cloth 41 faces upward.

[0111] Apply a third hot melt adhesive 45 to the first layer of the completed flipping structure.

[0112] After the third hot melt adhesive 45 is applied, activated carbon is added onto the first filter cloth 41.

[0113] After feeding is completed, a fourth hot melt adhesive 46 is applied along one side of the first filter cloth 41. The application point of the fourth hot melt adhesive 46 is parallel to the application point of the second hot melt adhesive 43 and their vertical projections do not overlap.

[0114] After the fourth hot melt adhesive 46 is applied, the third filter cloth 47 is conveyed above the activated carbon. One side of the second filter cloth 44 along the production forward direction is flush with the side of the first filter cloth 41 where the fourth hot melt adhesive is applied. The third filter cloth 47 is positioned within the projection plane of the first filter cloth 41 along the other side of the production forward direction, resulting in a second layered structure.

[0115] The second layer structure is conveyed to the second pressure roller 82 for pressing. After pressing, it is cooled and solidified during the transmission process. The cooling temperature is 5℃-8℃ to obtain the first absorption layer 4.

[0116] Preparation of the second absorber layer:

[0117] The fourth filter cloth 51 is placed on the conveyor belt, and the fifth hot melt adhesive 52 is sprayed onto the middle of the fourth filter cloth 51 during its transport.

[0118] After the fifth hot melt adhesive 52 is sprayed, feed fiber 10 is added onto the fourth filter cloth 51.

[0119] After feeding is completed, apply the sixth hot melt adhesive 53 along one side of the fourth filter cloth 52.

[0120] After the sixth hot melt adhesive 53 is applied, the fifth filter cloth 54 is conveyed above the fiber 10. One side of the fifth filter cloth 54 along the production line's forward direction is flush with the side of the fourth filter cloth 51 where the sixth hot melt adhesive 53 was applied. The other side of the fifth filter cloth 54 along the production forward direction is positioned within the projection plane of the fourth filter cloth 52, resulting in a third layered structure.

[0121] The third layer structure is conveyed to the third pressure roller 83 for pressing. After pressing, it is cooled and solidified during the transmission process. The cooling temperature is 5℃-8℃ to obtain the second absorption layer 5.

[0122] Preparation of composite boards:

[0123] The first panel 1, the first absorbent layer 4, the first pad 12, the second absorbent layer 5, the support mesh 8, the second pad 13, and the second panel 2 are stacked in sequence. Adhesive is applied to the contact points of each stacked component, and the composite board is obtained by pressing after adhesive application.

[0124] The width of the second filter cloth 44 is greater than the application width of the first hot melt adhesive 42, and the width of the second filter cloth 44 is less than the width of the first filter cloth 41; the width of the third filter cloth 47 is greater than the application width of the third hot melt adhesive 45, and the width of the third filter cloth 47 is less than the width of the first filter cloth 41. This arrangement allows the second filter cloth 44 or the third filter cloth 47 to effectively encapsulate the activated carbon while saving material usage. It also reduces the amount of the second filter cloth 44 and the third filter cloth 47 used, increases the contact area between the activated carbon and the gas, and improves the gas absorption effect of the composite board.

[0125] The first hot melt adhesive 42 is sprayed in an "S" shaped path, and the third hot melt adhesive 45 is sprayed in an "S" shaped path, with the application points of the third hot melt adhesive 45 and the first hot melt adhesive 42 overlapping in projection. The "S" shaped application method facilitates continuous application and improves production efficiency. At the same time, the overlap between the application points of the third hot melt adhesive 45 and the first hot melt adhesive 42 causes the first absorbent layer 4 to form multiple wavy cavity structures.

[0126] The path of the fifth hot melt adhesive 52 sprayed is "S" shaped.

[0127] The second hot melt adhesive 43, the fourth hot melt adhesive 46, and the sixth hot melt adhesive 53 are all applied in a straight line along the production forward direction.

[0128] The activated carbon is fed onto the first filter cloth 41 in an intermittent manner, specifically by intermittently feeding the material into the feeding area enclosed by the first hot melt adhesive 42 or the third hot melt adhesive 45.

[0129] The fourth filter cloth 51 is fed in an intermittent manner, specifically, the material is fed at intervals to the feeding point enclosed by the fifth hot melt adhesive 52.

[0130] The first absorbent layer 4 includes a first filter cloth 41. An "S"-shaped first hot melt adhesive 42 is provided on one side of the first filter cloth 41, wherein an activated carbon feeding point is provided between the first hot melt adhesives 42. A second filter cloth 44 is provided on the first filter cloth 41, and activated carbon is provided between the first filter cloth 41, the second filter cloth 44, the first hot melt adhesive 42, and the second hot melt adhesive 43. A second hot melt adhesive 43 is provided on one side of the first filter cloth 41 to adhere to the side of the second filter cloth 44. An "S"-shaped third hot melt adhesive 45 is provided on the other side of the first filter cloth 41, wherein an activated carbon feeding point is provided between the third hot melt adhesives 45. A third filter cloth 47 is provided on the first filter cloth 41, and activated carbon is provided between the first filter cloth 41, the third filter cloth 47, the third hot melt adhesive 45, and the fourth hot melt adhesive 46. A fourth hot melt adhesive 46 is provided on one side of the first filter cloth 41 to adhere to the side of the third filter cloth 41. The first absorption layer 4 is formed into multiple spaced cavity structures, wherein the center line of the cavity structures is wavy, which increases the specific surface area, increases the contact area with the gas, and improves the absorption efficiency.

[0131] The second absorption layer 5 includes a fourth filter cloth 51. An "S"-shaped fifth hot melt adhesive 52 is disposed on one side of the fourth filter cloth 51, with fiber feeding points located between the fifth hot melt adhesives 52. A fifth filter cloth 54 is disposed on the fourth filter cloth 51, and fibers are disposed between the fourth filter cloth 51, the fifth filter cloth 54, the fifth hot melt adhesive 52, and the sixth hot melt adhesive 53. This creates multiple spaced-apart cavity structures in the second absorption layer 5, with the cavity structures arranged in a planar, spaced apart. These multiple spaced-apart cavity structures allow the first absorption layer 4 and the second absorption layer 5 to interlock, improving the absorption effect. The smaller absorption layer size makes formaldehyde adsorption more effective.

[0132] Secondly, the other side of the second absorbent layer 5 can also be provided with wrapping fibers. By repeating the flipping, gluing, feeding and pressing processes as in the preparation process of the first absorbent layer 4, a cavity structure with multiple spaced intervals on both sides, as in the first absorbent layer 4, can be formed.

[0133] A groove 14 is provided on one side of the first panel 1 to facilitate the assembly of the first absorption layer 4.

[0134] The first panel 1 is provided with multiple rows of through holes 11 that are connected to the first absorption layer 4. The shapes of the through holes include square, circular, and hexagonal.

[0135] The support mesh 8 is specifically a stainless steel mesh with a mesh size of 1 square centimeter. The support mesh 8 provides support for the second absorbent layer 5 while simultaneously forming a second buffer cavity 7 between the second absorbent layer 5 and the second panel 2.

[0136] The layers of the composite board are fixed together by applying hot melt adhesive or glue to the edges. The first spacer strip 12 and the second spacer strip 13 are made of silicone and are elongated strips. The elongated shape of the first spacer strip 12 and the second spacer strip 13 facilitates assembly and allows for continuous production during the assembly process, thus improving efficiency.

[0137] The first filter cloth 41, the second filter cloth 44, and the third filter cloth 47 are all made of PP material with a mesh size of 800-1500; or non-woven fabric can be used instead.

[0138] The fourth filter cloth 51 and the fifth filter cloth 54 are both made of PP material with a mesh size of 120-200.

[0139] The fiber is specifically a mixture of cotton-type short fiber and wool-type short fiber in a 1:1 weight ratio, wherein the linear density of the cotton-type short fiber is 1.3dtex-1.7dtex; and the linear density of the wool-type short fiber is 3.3dtex-7.7dtex.

[0140] The flipping mechanism 88 includes a first roller group 881, a second roller group 882, a third roller group 883, a fourth roller group 884, a fifth roller group 885, and a sixth roller group 886 arranged sequentially. The inclination of the first roller group 881, the second roller group 882, and the third roller group 883 gradually increases until the fourth roller group 884 is completely vertical. The fourth roller group 884, the fifth roller group 885, and the sixth roller group 886 gradually tilt until they are horizontal. This flipping method is simple and easy to implement. In conjunction with the production line operation, multiple roller groups work together to continuously convey and flip the rollers, resulting in high work efficiency.

[0141] The activated carbon is added intermittently, stopping at the hot melt adhesive application point and discharging at the non-hot melt adhesive application point; specifically, it is added once every other feeding point.

[0142] The fiber is added intermittently, with fiber addition stopping at the hot melt adhesive application point and material discharge at the non-hot melt adhesive application point; specifically, material is added once every other feeding point.

[0143] Example 2:

[0144] Example 2 is based on Example 1, with an exhaust vent 21 for switching on and off provided on the second panel 2. Vacuuming through the exhaust vent 21 can remove formaldehyde that has been adsorbed on the first absorption layer 4 and the second absorption layer 5, thereby improving the formaldehyde absorption capacity of the composite board for subsequent reuse. It has a high reuse rate and is more environmentally friendly.

[0145] Comparative Example 1:

[0146] Comparative Example 1 involves sequentially stacking a first panel 1, a first pad 12, a second absorbent layer 5, a support mesh 8, a second pad 13, and a second panel 2. Adhesive is applied to the contact points of each stacked component, and the composite board is obtained by pressing after adhesive application.

[0147] Comparative Example 2:

[0148] Comparative Example 2 involves sequentially stacking the first panel 1, the first absorbent layer 4, the first pad 125, the support mesh 8, the second pad 13, and the second panel 2. Adhesive is applied to the contact points of each stacked component, and the composite board is obtained by pressing after adhesive application.

[0149] Comparative Example 3:

[0150] Comparative Example 3 is formed by simply bonding the first surface layer 1 and the second surface layer 2 together, serving as a blank group.

[0151] The composite panels prepared in Examples 1-2 and Comparative Examples 1-3 were subjected to relevant performance tests, and the results are shown in Table 1 below. The composite panels were prepared with a size of 450 mm. 450mm 50mm; Performance testing of composite panels was conducted in accordance with JC / T1074-2008.

[0152]

[0153] Analysis of the data in Table 1 shows that the composite boards prepared in Examples 1-2 have good formaldehyde adsorption performance and can effectively reduce the formaldehyde content in the outside air. The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 did not add the first absorption layer 4. As shown in Table 1, the composite board without the first absorption layer 4 has a significantly reduced formaldehyde adsorption performance, indicating that the composite board with the first absorption layer 4 can effectively adsorb formaldehyde. Comparative Example 2 did not add the second absorption layer 5. As shown in Table 1, the composite board without the second absorption layer 5 has a significantly reduced formaldehyde adsorption performance, indicating that the composite board with the second absorption layer 5 can effectively adsorb formaldehyde.

[0154] The first buffer layer provides space for the first and second absorption layers to work together. After initial absorption, the first absorption layer enters the second absorption layer for further adsorption, improving the adsorption effect of formaldehyde and effectively reducing the formaldehyde content in the outside air. The second buffer chamber is set up so that after the second absorption layer adsorbs formaldehyde, a small amount of gas is discharged into the second buffer chamber. This setting reduces the formaldehyde content in the second buffer chamber and improves the absorption effect of the second absorption layer. At the same time, the production method involves spraying hot melt adhesive, feeding, attaching the filter cloth, turning, applying hot melt adhesive again, feeding, and attaching the filter cloth. This method allows for continuous production and improves production efficiency. Due to the "S"-shaped adhesive application method, the prepared first or second absorption layer can be cut as needed during use, improving the flexibility of use.

[0155] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0156] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A formaldehyde-absorbing board, comprising a first panel, a second panel, and a composite layer disposed between the first panel and the second panel, characterized in that, The composite layer includes a first absorbent layer, a second absorbent layer disposed below the first absorbent layer, a first buffer cavity disposed between the first absorbent layer and the second absorbent layer, and a second buffer cavity disposed between the second absorbent layer and the second panel. The first panel is provided with multiple rows of through holes that are connected to the first absorption layer; The method for preparing the formaldehyde-adsorbing board includes the following steps: Preparation of the first absorber layer: The first filter cloth is placed on the conveyor belt, and the first hot melt adhesive is sprayed on the middle of the first filter cloth during the conveying process. The path of the first hot melt adhesive is "S" shaped. After the first hot melt adhesive is sprayed, activated carbon is added onto the first filter cloth. After feeding is completed, apply the second hot melt adhesive along one side of the first filter cloth. The second hot melt adhesive is applied in a straight line along the production forward direction. After the second hot melt adhesive is applied, the second filter cloth is conveyed above the activated carbon. One side of the second filter cloth along the production forward direction is flush with the side of the first filter cloth on which the second hot melt adhesive was applied. The other side of the second filter cloth along the production forward direction is positioned within the projection plane of the first filter cloth, thus obtaining the first layered structure. The first layer of the stacked structure is conveyed to the first pressure roller for pressing. After pressing, the first laminated structure is conveyed to the flipping mechanism for flipping, so that the first filter cloth is placed facing upwards. Apply a third hot melt adhesive to the first layered structure after it has been flipped, and the path of the sprayed third hot melt adhesive is "S" shaped; After the third hot melt adhesive is applied, activated carbon is added onto the first filter cloth. After the material feeding is completed, a fourth hot melt adhesive is applied along one side of the first filter cloth. The application point of the fourth hot melt adhesive is parallel to the application point of the second hot melt adhesive, and their vertical projections do not overlap. After the fourth hot melt adhesive is applied, the third filter cloth is conveyed above the activated carbon. One side of the second filter cloth along the production forward direction is flush with the side of the first filter cloth where the fourth hot melt adhesive is applied. The other side of the third filter cloth along the production forward direction is positioned within the projection plane of the first filter cloth, resulting in a second layered structure. The second layer structure is conveyed to the second pressure roller for pressing, and the first absorption layer is obtained after pressing. Preparation of the second absorber layer: Place the fourth filter cloth on the conveyor belt, and spray the fifth hot melt adhesive on the middle of the fourth filter cloth during the transmission process. The path of the sprayed fifth hot melt adhesive is "S" shaped. After the fifth hot melt adhesive is sprayed, the fiber is fed onto the fourth filter cloth. After feeding is completed, apply the sixth hot melt adhesive along one side of the fourth filter cloth. The application method of the sixth hot melt adhesive is to apply it in a straight line along the production forward direction. After the sixth hot melt adhesive is applied, the fifth filter cloth is conveyed above the fiber. One side of the fifth filter cloth along the production line's forward direction is flush with the side of the fourth filter cloth where the sixth hot melt adhesive was applied. The other side of the fifth filter cloth along the production line's forward direction is positioned within the projection plane of the fourth filter cloth, resulting in the third layered structure. The third layer structure is conveyed to the third pressure roller for pressing, and the second absorption layer is obtained after pressing. Preparation of composite boards: The first panel, the first absorbent layer, the first pad, the second absorbent layer, the support mesh, the second pad, and the second panel are stacked in sequence. Adhesive is applied to the contact points of each stacked component, and the composite board is obtained by pressing after adhesive application.

2. The formaldehyde-adsorbing board according to claim 1, characterized in that, A first spacer strip is provided between the first absorbent layer and the second absorbent layer.

3. The formaldehyde-adsorbing board according to claim 1, characterized in that, A second spacer strip is provided between the second absorbent layer and the second panel.

4. The formaldehyde-absorbing board according to claim 3, characterized in that, A support mesh is provided between the second pad and the second absorbent layer.

5. The formaldehyde-adsorbing board according to claim 4, characterized in that, A groove is provided on one side of the first panel.

6. A method for preparing a formaldehyde-adsorbing board, characterized in that, Includes the following steps, Preparation of the first absorber layer: The first filter cloth is placed on the conveyor belt, and the first hot melt adhesive is sprayed on the middle of the first filter cloth during the conveying process. The path of the first hot melt adhesive is "S" shaped. After the first hot melt adhesive is sprayed, activated carbon is added onto the first filter cloth. After feeding is completed, apply the second hot melt adhesive along one side of the first filter cloth. The second hot melt adhesive is applied in a straight line along the production forward direction. After the second hot melt adhesive is applied, the second filter cloth is conveyed above the activated carbon. One side of the second filter cloth along the production forward direction is flush with the side of the first filter cloth on which the second hot melt adhesive was applied. The other side of the second filter cloth along the production forward direction is positioned within the projection plane of the first filter cloth, thus obtaining the first layered structure. The first layer of the stacked structure is conveyed to the first pressure roller for pressing. After pressing, the first laminated structure is conveyed to the flipping mechanism for flipping, so that the first filter cloth is placed facing upwards. Apply a third hot melt adhesive to the first layered structure after it has been flipped, and the path of the sprayed third hot melt adhesive is "S" shaped; After the third hot melt adhesive is applied, activated carbon is added onto the first filter cloth. After the material feeding is completed, a fourth hot melt adhesive is applied along one side of the first filter cloth. The application point of the fourth hot melt adhesive is parallel to the application point of the second hot melt adhesive, and their vertical projections do not overlap. After the fourth hot melt adhesive is applied, the third filter cloth is conveyed above the activated carbon. One side of the second filter cloth along the production forward direction is flush with the side of the first filter cloth where the fourth hot melt adhesive is applied. The other side of the third filter cloth along the production forward direction is positioned within the projection plane of the first filter cloth, resulting in a second layered structure. The second layer structure is conveyed to the second pressure roller for pressing, and the first absorption layer is obtained after pressing. Preparation of the second absorber layer: Place the fourth filter cloth on the conveyor belt, and spray the fifth hot melt adhesive on the middle of the fourth filter cloth during the transmission process. The path of the sprayed fifth hot melt adhesive is "S" shaped. After the fifth hot melt adhesive is sprayed, the fiber is fed onto the fourth filter cloth. After feeding is completed, apply the sixth hot melt adhesive along one side of the fourth filter cloth. The application method of the sixth hot melt adhesive is to apply it in a straight line along the production forward direction. After the sixth hot melt adhesive is applied, the fifth filter cloth is conveyed above the fiber. One side of the fifth filter cloth along the production line's forward direction is flush with the side of the fourth filter cloth where the sixth hot melt adhesive was applied. The other side of the fifth filter cloth along the production line's forward direction is positioned within the projection plane of the fourth filter cloth, resulting in the third layered structure. The third layer structure is conveyed to the third pressure roller for pressing, and the second absorption layer is obtained after pressing. Preparation of composite boards: The first panel, the first absorbent layer, the first pad, the second absorbent layer, the support mesh, the second pad, and the second panel are stacked in sequence. Adhesive is applied to the contact points of each stacked component, and the composite board is obtained by pressing after adhesive application.

7. The method for preparing formaldehyde-adsorbing board according to claim 6, characterized in that, After the first layered structure is pressed, it is cooled and cured during the transportation process at a temperature of 5℃-8℃.

8. The method for preparing formaldehyde-adsorbing board according to claim 7, characterized in that, The second layered structure, after being pressed, is cooled and solidified during transport at a temperature of 5°C-8°C.

9. The method for preparing formaldehyde-adsorbing board according to claim 7, characterized in that, The width of the second filter cloth is greater than the application width of the first hot melt adhesive, and the width of the second filter cloth is less than the width of the first filter cloth; the width of the third filter cloth is greater than the application width of the third hot melt adhesive, and the width of the third filter cloth is less than the width of the first filter cloth.

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