CN113374196A - Formaldehyde removal wall cloth - Google Patents
Formaldehyde removal wall cloth Download PDFInfo
- Publication number
- CN113374196A CN113374196A CN202110744684.6A CN202110744684A CN113374196A CN 113374196 A CN113374196 A CN 113374196A CN 202110744684 A CN202110744684 A CN 202110744684A CN 113374196 A CN113374196 A CN 113374196A
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- CN
- China
- Prior art keywords
- formaldehyde
- wall
- wall cloth
- layer
- removal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F13/00—Coverings or linings, e.g. for walls or ceilings
- E04F13/002—Coverings or linings, e.g. for walls or ceilings made of webs, e.g. of fabrics, or wallpaper, used as coverings or linings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
Abstract
The invention provides a formaldehyde removing wall cloth, and relates to the technical field of formaldehyde removal. The utility model provides a remove formaldehyde wall paper, includes the wall paper body, and the wall paper body is including the surface course and the bottom of range upon range of connection in proper order, and the bottom intussuseption is filled with the absorbent who is used for absorbing formaldehyde. Compared with the mode of adding formaldehyde removal equipment in the prior art, the invention can effectively save the cost caused by formaldehyde removal by filling the absorbing material in the bottom layer, and meanwhile, the invention can carry out long-time uninterrupted formaldehyde absorption after being assembled on a wall body without other cost; according to the invention, the absorption material is filled in the wall cloth body, so that the formaldehyde can be absorbed for a long time, the removal rate of the formaldehyde is as high as 95.6%, the economic cost brought by the removal of the formaldehyde is effectively reduced, and the wall cloth has high practical value and is convenient to popularize and use in a large range.
Description
Technical Field
The invention relates to the technical field of formaldehyde removal, and particularly relates to a formaldehyde removal wall cloth.
Background
The wall cloth is an indoor decorative material which is widely applied, and has the characteristics of rich colors, various patterns, various textures, noble and elegant decorative effect, high construction efficiency and the like. With the increasing demand of people for interior decoration effect, various decorative materials such as plywood, blockboard, medium density fiberboard, shaving board, wall cloth, wall paper, chemical fiber carpet, paint and coating used for interior decoration are increasingly applied to the interior decoration of families, but the building materials continuously release free formaldehyde to the surrounding environment due to the use of adhesives such as urea-formaldehyde resin, melamine and phenol-formaldehyde resin which take formaldehyde as raw materials, so that indoor air pollution is caused, and human health is harmed. Therefore, formaldehyde removal is an important step after home decoration.
However, the formaldehyde removal method is various, plants are placed, the activated carbon is used for removing formaldehyde, special equipment is available for removing formaldehyde, and the methods are high in cost or poor in formaldehyde adsorption effect.
Disclosure of Invention
The invention aims to provide a formaldehyde removing wall cloth which can absorb indoor formaldehyde gas and has high adsorption efficiency.
The embodiment of the invention is realized by the following steps:
the embodiment of the application provides a remove formaldehyde wall paper, including the wall paper body, the wall paper body is including the surface course and the bottom that stack gradually the connection, it has the absorbent substance who is used for absorbing formaldehyde to fill in the bottom.
In some embodiments of the present invention, the top layer and the bottom layer are connected by an adhesive.
In some embodiments of the present invention, the adhesive glue comprises a polyurethane laminating glue.
In some embodiments of the present invention, the base layer comprises a nonwoven fabric layer.
In some embodiments of the present invention, the nonwoven layer is treated by a spunlace process.
In some embodiments of the present invention, the absorbent material includes activated carbon particles, and the activated carbon particles are filled in the non-woven fabric layer.
In some embodiments of the invention, the facing layer comprises a non-woven wallpaper.
In some embodiments of the invention, the side wall of the facing layer remote from the base layer has a pattern.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
the embodiment of the application provides a remove formaldehyde wall paper, including the wall paper body, the wall paper body is including the surface course and the bottom that stack gradually the connection, and the bottom intussuseption is filled with the absorbing material who is used for absorbing formaldehyde. The surface layer is a layer body displayed indoors, the bottom layer is a layer body connected with the wall body, and the bottom layer is used for bearing the surface layer to realize installation; compared with the mode of adding formaldehyde removal equipment in the prior art, the invention can effectively save the cost caused by formaldehyde removal by filling the absorbing material in the bottom layer, and meanwhile, the invention can carry out long-time uninterrupted formaldehyde absorption after being assembled on a wall body without other cost; according to the invention, the absorption material is filled in the wall cloth body, so that the formaldehyde can be absorbed for a long time, the removal rate of the formaldehyde is as high as 95.6%, the economic cost brought by the removal of the formaldehyde is effectively reduced, and the wall cloth has high practical value and is convenient to popularize and use in a large range.
When in actual use, the user customizes the wall cloth body according to the size of the room pattern, and the wall cloth body is bonded on the wall body for continuous use.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural view of a part of a wall cloth body according to an embodiment of the invention;
fig. 2 is a schematic view of a bottom layer structure according to an embodiment of the present invention.
Icon: 1-surface layer; 2-a bottom layer; 3-absorbing substance.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are usually placed in when used, the orientations or positional relationships are only used for convenience of describing the present invention and simplifying the description, but the terms do not indicate or imply that the devices or elements indicated must have specific orientations, be constructed in specific orientations, and operate, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not require that the components be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Examples
Referring to fig. 1 and 2, fig. 1 is a schematic structural view of a part of a wall cloth body according to an embodiment of the invention; fig. 2 is a schematic structural diagram of a bottom layer 2 according to an embodiment of the present invention.
The embodiment of the application provides a remove formaldehyde wall paper, including the wall paper body, the wall paper body is including the surface course 1 and the bottom 2 that stack gradually the connection, and the bottom 2 intussuseption is filled with the absorbent 3 that is used for absorbing formaldehyde. The surface layer 1 is a layer body displayed indoors, the bottom layer 2 is a layer body connected with a wall body, and the bottom layer 2 is used for bearing the surface layer 1 to realize installation; compared with the mode of adding formaldehyde removal equipment in the prior art, the invention can effectively save the cost caused by formaldehyde removal by filling the absorbing material 3 in the bottom layer 2, and meanwhile, the invention can carry out long-time uninterrupted formaldehyde absorption after being assembled on a wall body without other cost; according to the invention, the absorption material 3 is filled in the wall cloth body, so that the formaldehyde can be absorbed for a long time, the removal rate of the formaldehyde is as high as 95.6%, the economic cost brought by the removal of the formaldehyde is effectively reduced, and the wall cloth has high practical value and is convenient to popularize and use in a large range.
When in actual use, the user customizes the wall cloth body according to the size of the room pattern, and the wall cloth body is bonded on the wall body for continuous use.
In some embodiments of the invention, as shown in fig. 1, the face layer 1 and the base layer 2 are joined by an adhesive glue.
In some embodiments of the invention, the adhesive glue comprises a polyurethane laminating glue.
The polyurethane composite adhesive in this embodiment refers to an adhesive containing a urethane group (-NHCOO-) or an isocyanate group (-NCO) in a molecular chain. The polyurethane composite adhesive is divided into two categories of polyisocyanate and polyurethane. The molecular chain of the polyisocyanate contains isocyano (-NCO) and carbamate (-NH-COO-), so that the polyurethane adhesive shows high activity and polarity. The adhesive has excellent chemical adhesion with substrates containing active hydrogen, such as porous materials of foam, plastic, wood, leather, fabric, paper, ceramic and the like, and materials with smooth surfaces of metal, glass, rubber, plastic and the like.
In some embodiments of the present invention, as shown in fig. 1 and 2, the bottom layer 2 comprises a nonwoven layer.
The non-woven fabric in this embodiment is also called non-woven fabric, needle-punched cotton, needle-punched non-woven fabric, etc., and is produced by using polyester fiber and polyester fiber (abbreviated as PET) material, and is manufactured by needle-punching process, and can be made into different thicknesses, hand feeling, hardness, etc. The non-woven fabric has the characteristics of moisture resistance, air permeability, flexibility, light weight, flame retardance, no toxicity, no odor, low price, recycling and the like; simultaneously, the utility model also has the following characteristics of water repellency and air permeability: the polypropylene slice has no water absorption, zero water content, good water repellency of finished products, porosity formed by 100 percent of fibers, good air permeability, easy maintenance of dry and comfortable cloth surface and easy washing. The product is produced by adopting food-grade raw materials which accord with FDA, does not contain other chemical components, has stable performance, no toxicity, no peculiar smell and no irritation to skin. Antibacterial, anti-chemical agents: the polypropylene chemical inactive substance is not damaged by worms and can isolate the corrosion of bacteria and insects in the liquid; antibacterial, alkali corrosion, and the strength of the finished product is not affected by corrosion. And (4) antibacterial property. The product has water-drawing property, does not go moldy, can isolate the corrosion of bacteria and insects in the liquid and is not damaged by the mold. Has good physical properties. The product is formed by directly laying polypropylene spinning into a net and thermally bonding, has better strength than common short fiber products, and has non-directional strength and similar longitudinal and transverse strength.
In some embodiments of the present invention, as shown in fig. 1 and 2, the nonwoven layer is treated by a hydroentangling process. The spunlace nonwoven fabric is formed by jetting high-pressure micro water flow onto one or more layers of fiber webs to enable the fibers to be mutually entangled, so that the fiber webs are reinforced and have certain strength, and the obtained fabric is the spunlace nonwoven fabric. It has the following characteristics: flexible entanglement, no influence on the original characteristics of the fiber and no damage to the fiber; the appearance is closer to traditional textiles than other nonwoven materials; high strength and low fuzz; high hygroscopicity and rapid moisture absorption; the air permeability is good; soft hand feeling and good drapability.
In some embodiments of the present invention, as shown in fig. 2, the absorbent material 3 comprises activated carbon particles, which are filled in a non-woven fabric layer. Activated carbon is a specially treated carbon produced by heating an organic raw material (husk, coal, wood, etc.) in the absence of air to reduce non-carbon components (this process is called carbonization), and then reacting with a gas to erode the surface and produce a structure with developed micropores (this process is called activation). Since the activation process is a microscopic process, i.e., the surface erosion of a large amount of molecular carbides is a point-like erosion, the surface of the activated carbon is caused to have countless fine pores. The diameter of micropores on the surface of the activated carbon is mostly between 2 nm and 50nm, even a small amount of activated carbon has a huge surface area, the surface area of each gram of activated carbon is 500m to 1500m2, and all applications of the activated carbon are almost based on the characteristic of the activated carbon; the adsorption of formaldehyde is realized by utilizing the porous structure of the activated carbon.
In some embodiments of the invention, as shown in fig. 1, facing 1 comprises a non-woven wallpaper. The non-woven fabric wallpaper, also called non-woven paper wallpaper, is one of high-grade wallpaper/wallpaper, and is made by adopting a natural plant fiber non-woven process, so that the non-woven fabric wallpaper is stronger in tensile force, more environment-friendly, not mildewed or yellow, good in air permeability and is a main base material of high-quality wallpaper.
In some embodiments of the invention, the side wall of facing layer 1 remote from base layer 2 is textured, as shown in figure 1. The user can carry out DIY patterns on the side wall of the surface layer 1, and the attractiveness and the adaptability of the novel decorative pattern are improved.
In summary, the embodiment of the invention provides a wall cloth for removing formaldehyde, which includes a wall cloth body, the wall cloth body includes a surface layer 1 and a bottom layer 2, which are sequentially stacked and connected, and an absorbing material 3 for absorbing formaldehyde is filled in the bottom layer 2. The surface layer 1 is a layer body displayed indoors, the bottom layer 2 is a layer body connected with a wall body, and the bottom layer 2 is used for bearing the surface layer 1 to realize installation; compared with the mode of adding formaldehyde removal equipment in the prior art, the invention can effectively save the cost caused by formaldehyde removal by filling the absorbing material 3 in the bottom layer 2, and meanwhile, the invention can carry out long-time uninterrupted formaldehyde absorption after being assembled on a wall body without other cost; according to the invention, the absorption material 3 is filled in the wall cloth body, so that the formaldehyde can be absorbed for a long time, the removal rate of the formaldehyde is as high as 95.6%, the economic cost brought by the removal of the formaldehyde is effectively reduced, and the wall cloth has high practical value and is convenient to popularize and use in a large range.
When in actual use, the user customizes the wall cloth body according to the size of the room pattern, and the wall cloth body is bonded on the wall body for continuous use.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a remove formaldehyde wall paper, its characterized in that includes the wall paper body, the wall paper body is including the surface course and the bottom that stack gradually the connection, it has the absorbent substance who is used for absorbing formaldehyde to fill in the bottom.
2. The formaldehyde-removing wall cloth as claimed in claim 1, wherein the face layer and the bottom layer are connected by an adhesive.
3. The formaldehyde-removing wall cloth as claimed in claim 2, wherein the adhesive glue comprises polyurethane composite glue.
4. The formaldehyde-removing wall cloth of claim 1, wherein the bottom layer comprises a non-woven fabric layer.
5. The formaldehyde-removing wall cloth as claimed in claim 4, wherein the non-woven fabric layer is treated by a water-jet punching process.
6. The formaldehyde-removing wall cloth according to claim 4, wherein the absorbent material comprises activated carbon particles, and the activated carbon particles are filled in the non-woven fabric layer.
7. The formaldehyde-removing wall cloth according to claim 1, wherein the surface layer comprises a non-woven wallpaper.
8. The formaldehyde-removing wall cloth as claimed in claim 1, wherein the side wall of the surface layer away from the bottom layer has a pattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110744684.6A CN113374196A (en) | 2021-06-30 | 2021-06-30 | Formaldehyde removal wall cloth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110744684.6A CN113374196A (en) | 2021-06-30 | 2021-06-30 | Formaldehyde removal wall cloth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113374196A true CN113374196A (en) | 2021-09-10 |
Family
ID=77580579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110744684.6A Pending CN113374196A (en) | 2021-06-30 | 2021-06-30 | Formaldehyde removal wall cloth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113374196A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101314100A (en) * | 2008-07-03 | 2008-12-03 | 陈晓鹏 | Fibre pad for removing indoor air pollution and method of producing the same |
| CN202850418U (en) * | 2012-09-05 | 2013-04-03 | 绍兴县舒丽乐纺织品有限公司 | Activated carbon functional seamless textile wall covering |
| CN203271025U (en) * | 2013-05-15 | 2013-11-06 | 浙江维涅斯装饰材料有限公司 | Wall paper having peculiar smell eliminating function |
| CN203360938U (en) * | 2013-06-17 | 2013-12-25 | 广东玉兰装饰材料有限公司 | Wallpaper with formaldehyde removing function |
| CN204475055U (en) * | 2015-03-16 | 2015-07-15 | 王振民 | A kind of wallpaper having function of removing formaldehyde |
| CN105386369A (en) * | 2015-11-16 | 2016-03-09 | 太仓东能环保设备有限公司 | Novel deodorant wallpaper and preparation method thereof |
| CN105648840A (en) * | 2014-12-05 | 2016-06-08 | 遵义市美仑空间个性艺术装饰材料中心 | Wallpaper for purifying air |
| CN207772526U (en) * | 2018-01-02 | 2018-08-28 | 绍兴鑫裕纺织品有限公司 | A kind of activated carbon wall paper |
| CN208533907U (en) * | 2018-05-23 | 2019-02-22 | 浙江恒凯装饰材料科技有限公司 | A kind of imitative Freehandhand-drawing composite wall cloth |
| CN110373915A (en) * | 2019-08-16 | 2019-10-25 | 大连瑞源非织造布有限公司 | A kind of the environment-friendly non-woven fabric wallpaper and its preparation process of absorbable and degradable formaldehyde |
| CN209780090U (en) * | 2019-03-19 | 2019-12-13 | 黄再国 | Activated carbon formaldehyde-removing wall cloth |
| CN212053532U (en) * | 2020-04-09 | 2020-12-01 | 蒋乐强 | Wall cloth with functions of removing formaldehyde, benzene, peculiar smell and various bacteria |
| CN213138160U (en) * | 2020-03-23 | 2021-05-07 | 四川南荼生物科技有限公司 | Novel remove formaldehyde wall paper that breathes freely |
-
2021
- 2021-06-30 CN CN202110744684.6A patent/CN113374196A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101314100A (en) * | 2008-07-03 | 2008-12-03 | 陈晓鹏 | Fibre pad for removing indoor air pollution and method of producing the same |
| CN202850418U (en) * | 2012-09-05 | 2013-04-03 | 绍兴县舒丽乐纺织品有限公司 | Activated carbon functional seamless textile wall covering |
| CN203271025U (en) * | 2013-05-15 | 2013-11-06 | 浙江维涅斯装饰材料有限公司 | Wall paper having peculiar smell eliminating function |
| CN203360938U (en) * | 2013-06-17 | 2013-12-25 | 广东玉兰装饰材料有限公司 | Wallpaper with formaldehyde removing function |
| CN105648840A (en) * | 2014-12-05 | 2016-06-08 | 遵义市美仑空间个性艺术装饰材料中心 | Wallpaper for purifying air |
| CN204475055U (en) * | 2015-03-16 | 2015-07-15 | 王振民 | A kind of wallpaper having function of removing formaldehyde |
| CN105386369A (en) * | 2015-11-16 | 2016-03-09 | 太仓东能环保设备有限公司 | Novel deodorant wallpaper and preparation method thereof |
| CN207772526U (en) * | 2018-01-02 | 2018-08-28 | 绍兴鑫裕纺织品有限公司 | A kind of activated carbon wall paper |
| CN208533907U (en) * | 2018-05-23 | 2019-02-22 | 浙江恒凯装饰材料科技有限公司 | A kind of imitative Freehandhand-drawing composite wall cloth |
| CN209780090U (en) * | 2019-03-19 | 2019-12-13 | 黄再国 | Activated carbon formaldehyde-removing wall cloth |
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Application publication date: 20210910 |
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