CN114474918A - Anti-deformation wood-plastic composite board and preparation method thereof - Google Patents

Anti-deformation wood-plastic composite board and preparation method thereof Download PDF

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Publication number
CN114474918A
CN114474918A CN202210239820.0A CN202210239820A CN114474918A CN 114474918 A CN114474918 A CN 114474918A CN 202210239820 A CN202210239820 A CN 202210239820A CN 114474918 A CN114474918 A CN 114474918A
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China
Prior art keywords
wood
plate
plastic
curved plate
butt joint
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Pending
Application number
CN202210239820.0A
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Chinese (zh)
Inventor
王明虎
李青
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Guangdong Bangying New Material Co ltd
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Guangdong Bangying New Material Co ltd
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Priority to CN202210239820.0A priority Critical patent/CN114474918A/en
Publication of CN114474918A publication Critical patent/CN114474918A/en
Pending legal-status Critical Current

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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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
    • 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
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • 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
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B32B2037/243—Coating

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  • Laminated Bodies (AREA)

Abstract

The invention discloses an anti-deformation wood-plastic composite board and a preparation method thereof, belonging to the technical field of composite boards. This wood-plastic composite board of preapring for an unfavorable turn of events shape utilizes the curved surface cooperation of first curved plate and second curved plate, has not only improved the holistic compactness of this composite sheet, still can avoid wood-plastic core board to take place to expand and lead to the outer fringe face deformation of protection plywood as far as possible to be favorable to doing benefit to the normal use who guarantees this composite sheet.

Description

Anti-deformation wood-plastic composite board and preparation method thereof
Technical Field
The invention belongs to the technical field of composite boards, and particularly relates to an anti-deformation wood-plastic composite board and a preparation method thereof.
Background
The wood-plastic composite board is a board or a section produced by mixing polyethylene, polypropylene, polyvinyl chloride and the like instead of a common resin adhesive with more than 50% of waste plant fibers such as wood flour, rice hulls, straws and the like to form a new wood material, and then carrying out plastic processing processes such as extrusion, mould pressing, injection molding and the like. The method is mainly used in industries such as building materials, furniture, logistics packaging and the like.
However, in the use process of the existing wood-plastic plate, the inside of the plate body is easy to expand or contract due to the change of air humidity, or the wetting of water, or the environment of expansion with heat and contraction with cold, so that the deformation of the plate body is easily caused, and the normal use is affected.
Therefore, the anti-deformation wood-plastic composite board and the preparation method thereof are provided to solve the problems.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, the existing wood-plastic composite board is simple in structure and easy to expand and deform when being soaked by water or in a high-temperature environment, so that normal use is affected, and provides an anti-deformation wood-plastic composite board and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme that the anti-deformation wood-plastic composite board comprises:
the wood-plastic core board is provided with two planes which are opposite to each other, and the two planes are provided with first curved plates;
the two protection layer plates are clamped on two opposite planes of the wood-plastic core plate in a matching manner, one side of each protection layer plate, facing the wood-plastic core plate, is provided with a second curved plate matched with the first curved plate, and the first curved plate and the second curved plate are fixedly butted; and
and the butt joint side plates are arranged around the periphery of the wood-plastic core plate and the protective plate in a surrounding mode, and are in butt joint to form a closed cavity for wrapping the wood-plastic core plate.
Preferably, the upper and lower both ends face of wood-plastic core all is fixed with a plurality of first fixed columns that are used for erectting first curved plate, and packs the filling layer between the outer fringe face of first curved plate and wood-plastic core.
Preferably, one side of protection plywood towards wood-plastic core board is fixed with a plurality of second fixed columns that are used for erectting the second curved plate, and also packs the filling layer between second curved plate and the protection plywood.
Preferably, the first curved plate and the second curved plate are curved plate body structures with opposite concave-convex butt joints, and a bonding glue layer for bonding the first curved plate and the second curved plate is arranged between the first curved plate and the second curved plate
Preferably, the gaps at the butt joint of the two circles of butt joint side plates are positioned on four sides of the periphery of the wood-plastic core plate.
Preferably, the outer sides of the two circles of butt joint side plates are provided with drain holes, the drain holes in the two circles of drain holes are in butt joint matching to form a drain cavity, and the middle of the drain cavity is communicated with the gap at the butt joint position of the two circles of butt joint side plates.
Preferably, the opposite sides of the two circles of butt joint side plates are fixed with dry cotton.
The application also discloses a preparation method of the anti-deformation wood-plastic composite board, which comprises the following steps:
preparing a wood-plastic core board, namely mixing and stirring vinyl chloride plastic, a grafted plastic mixture, plant fibers, polyolefin resin, a foaming regulator, stearic acid, azodiisobutyronitrile, a pigment, a flame retardant, a mildew preventive, a silane coupling agent and a compatilizer uniformly, injecting the mixture into a mold, and then putting the mold into a hot press for hot press molding to obtain a semi-finished board;
placing the semi-finished plate into a cold pusher to be cooled to below 80 ℃, taking out the semi-finished plate from the cold pusher, and placing the semi-finished plate into greenhouse steam to be cured for 8 hours to obtain the wood-plastic core plate;
and after the protection laminate, the wood-plastic core plate and the butt joint side plate are processed into a whole, the outer surfaces of the protection laminate and the butt joint side plate are subjected to film coating treatment.
Preferably, the film covering treatment is to coat a waterproof material, and the formula of the waterproof material comprises composite microemulsion, composite auxiliary materials, an auxiliary agent, rosin and aluminum sulfate.
In conclusion, the technical effects and advantages of the invention are as follows: the anti-deformation wood-plastic composite board has the advantages that due to the matching of the first curved plate, the second fixing column, the second curved plate and the bonding glue layer, the protective layer board can be fixed on the outer side of the wood-plastic core board to achieve a protective effect, the curved surface matching of the first curved plate and the second curved plate is utilized, the contact area of the first curved plate and the second curved plate is increased, the integral compactness of the composite board is improved, the filling layer is matched to provide a buffer zone with a certain degree for the wood-plastic core board, the deformation of the outer edge surface of the protective layer board caused by the expansion of the wood-plastic core board is avoided as much as possible, and the normal use of the composite board is guaranteed;
in addition, this application still includes wash port, drainage chamber and dry silk floss, and this three's cooperation can avoid the water to see through the clearance of two rings of butt joint curb plate butt joints as far as possible and soak the wood-plastic core board to improve the protective effect to the wood-plastic core board, do benefit to the life of extension this composite sheet.
Drawings
Fig. 1 is a schematic structural view of a deformation-preventing wood-plastic composite board disclosed in the present application;
FIG. 2 is a schematic view of the internal structure of FIG. 1;
fig. 3 is a schematic structural diagram of a in fig. 2.
In the figure: 1. a wood-plastic core board; 101. a first fixed column; 102. a first curved plate; 2. a protective laminate; 201. a second fixed column; 202. a second curved plate; 3. butting the side plates; 301. a drain hole; 302. a drainage cavity; 4. a bonding glue layer; 5. a filling layer; 6. and (5) drying the cotton.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments.
The problem that the wood-plastic composite board deforms always exists in practical application, the deformation problem particularly protrudes out of the wood-plastic composite board for laying, for example, the wood-plastic composite board laid on the ground or the wall surface is fixed, the problem that the wood-plastic composite board laid in the wood-plastic composite board is likely to have an arched surface or a gap is solved, the attractiveness and the practicability are affected, and the problem that how to solve the problem that the wood-plastic composite board deforms is always a pain point in the industry.
Referring to fig. 1 and 2, a wood-plastic composite board of preapring for an unfavorable turn of events shape, including wood-plastic core 1 and protection plywood 2, protection plywood 2 is equipped with two and sets up respectively in the upper and lower both ends face of wood-plastic core 1, and protection plywood 2 is constructed towards one side edge of wood-plastic core 1 with round butt joint curb plate 3, and two protection plywood 2 form the airtight cavity of parcel wood-plastic core 1 through the butt joint of butt joint curb plate 3 to can carry out the protection of certain degree to wood-plastic core 1, weaken the environmental impact that wood-plastic core 1 received as far as possible.
Referring to fig. 3, a plurality of first fixing columns 101 are fixed on the upper end surface and the lower end surface of the wood-plastic core board 1, a first curved plate 102 is erected on the plurality of first fixing columns 101, the first curved plate 102 is of a curved plate body structure with an uneven surface, and a filling layer 5 is filled between the first curved plate 102 and the outer edge surface of the wood-plastic core board 1.
Simultaneously, one side of protection plywood 2 towards wood-plastic core board 1 is fixed with a plurality of second fixed columns 201, has erect second curved plate 202 jointly on a plurality of second fixed columns 201, and second curved plate 202 is the curved plate body structure of unevenness in surface, and also has filled filling layer 5 between second curved plate 202 and the protection plywood 2. The uneven surfaces of the first curved plate 102 and the second curved plate 202 are in butt joint and fit, and an adhesive layer 4 for adhesion and fixation is filled between the first curved plate and the second curved plate, wherein the adhesive layer 4 can be selected from adhesives such as polyethylene, polypropylene and polyvinyl chloride, or common resin adhesives.
Referring to fig. 3, the gaps at the butt joint of the two rings of butt joint side plates 3 are located on four sides of the periphery of the wood-plastic core plate 1, the outer sides of the two rings of butt joint side plates 3 are provided with drain holes 301, the drain holes 301 at the corresponding positions on the two rings of drain holes 301 are in butt joint matching to form a drain cavity 302, the middle of the drain cavity 302 is communicated with the gaps at the butt joint of the two rings of butt joint side plates 3, so that water which permeates into the gaps between the two rings of butt joint side plates 3 carelessly can be discharged through the drain holes 301, and the deep penetration of the water is avoided as much as possible.
Meanwhile, dry cotton 6 is fixed on one opposite side of the two circles of butt joint side plates 3, and the dry cotton 6 can further absorb and dry water, so that the waterproof protection of the wood-plastic core plate 1 is further improved.
The working principle is as follows: this wood-plastic composite board of preapring for an unfavorable turn of events shape, when using, usable bonding glue film 4 will come first curved plate 102 and second curved plate 202 curved surface bonding fixed, and is fixed effectual for two protection plywood 2 are fixed in the upper and lower both sides of wood-plastic core board 1, and the butt joint of two rings of butt joint curb plates 3 is mated, thereby protects wood-plastic core board 1 in enclosing the airtight space that forms, and forms the composite sheet main part. At this moment, the outside that protection plywood 2 was fixed in wood-plastic core 1 plays the protective effect to utilize the curved surface cooperation of first curved plate 102 and second curved plate 202, and the setting of filling layer 5, can provide the buffering area of certain degree for wood-plastic core 1, avoided wood-plastic core 1 to take place the inflation and lead to the outer fringe face deformation of protection plywood 2 as far as possible, thereby be favorable to guaranteeing the normal use of this composite sheet.
Simultaneously, wash port 301 and drainage chamber 302 can tentatively avoid the water to see through the clearance of two rings of butt joint curb plate 3 butt joints and soak wood-plastic core board 1 to the further drying process that absorbs water of dry cotton 6 of cooperation, thereby further improved the protective effect to wood-plastic core board 1, do benefit to the life of extension this composite sheet.
The application also discloses a preparation method of the anti-deformation wood-plastic composite board, which comprises the following steps:
preparing a wood-plastic core board, namely mixing and stirring vinyl chloride plastic, a grafted plastic mixture, plant fibers, polyolefin resin, a foaming regulator, stearic acid, azodiisobutyronitrile, a pigment, a flame retardant, a mildew preventive, a silane coupling agent and a compatilizer uniformly, injecting the mixture into a mold, and then putting the mold into a hot press for hot press molding to obtain a semi-finished board;
placing the semi-finished plate into a cold pusher to be cooled to below 80 ℃, taking out the semi-finished plate from the cold pusher, and placing the semi-finished plate into greenhouse steam to be cured for 8 hours to obtain the wood-plastic core plate;
and after the protection laminate, the wood-plastic core plate and the butt joint side plate are processed into a whole, the outer surfaces of the protection laminate and the butt joint side plate are subjected to film coating treatment.
The coating treatment is to coat a waterproof material, and the formula of the waterproof material comprises composite microemulsion, composite auxiliary materials, an auxiliary agent, rosin and aluminum sulfate.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (9)

1. The utility model provides a wood-plastic composite board of preapring for an unfavorable turn of events shape which characterized in that includes:
the wood-plastic core board is provided with two planes which are opposite to each other, and the two planes are provided with first curved plates;
the two protection layer plates are clamped on two opposite planes of the wood-plastic core plate in a matching manner, one side of each protection layer plate, facing the wood-plastic core plate, is provided with a second curved plate matched with the first curved plate, and the first curved plate and the second curved plate are fixedly butted; and
and the butt joint side plates are arranged around the periphery of the wood-plastic core plate and the protective plate in a surrounding mode, and are in butt joint to form a closed cavity for wrapping the wood-plastic core plate.
2. The anti-deformation wood-plastic composite board according to claim 1, wherein a plurality of first fixing columns for erecting the first curved plate are fixed on both the upper and lower end faces of the wood-plastic core board, and a filling layer is filled between the first curved plate and the outer edge face of the wood-plastic core board.
3. The anti-deformation wood-plastic composite board according to claim 2, wherein a plurality of second fixing columns for erecting the second curved plate are fixed on one side of the protection laminate facing the wood-plastic core board, and a filling layer is filled between the second curved plate and the protection laminate.
4. The anti-deformation wood-plastic composite board according to claim 3, wherein the first curved plate and the second curved plate are curved plate bodies with opposite concave-convex butt joints, and a bonding glue layer for bonding the first curved plate and the second curved plate is arranged between the first curved plate and the second curved plate.
5. The anti-deformation wood-plastic composite board according to claim 1, wherein gaps at the butt joint of the two rings of butt joint side boards are positioned at four peripheral sides of the wood-plastic core board.
6. The anti-deformation wood-plastic composite board according to claim 5, wherein the outer sides of the two circles of the butt joint side boards are respectively provided with a drainage hole, the drainage holes at corresponding positions on the two circles of the drainage holes are in butt joint fit to form a drainage cavity, and the middle of the drainage cavity is communicated with a gap at the butt joint position of the two circles of the butt joint side boards.
7. The anti-deformation wood-plastic composite board according to claim 6, wherein dry cotton is fixed on the opposite sides of the two circles of butt joint side boards.
8. The preparation method of the anti-deformation wood-plastic composite board is characterized by comprising the following steps:
preparing a wood-plastic core board, namely mixing and stirring vinyl chloride plastic, a grafted plastic mixture, plant fibers, polyolefin resin, a foaming regulator, stearic acid, azodiisobutyronitrile, a pigment, a flame retardant, a mildew preventive, a silane coupling agent and a compatilizer uniformly, injecting the mixture into a mold, and then putting the mold into a hot press for hot press molding to obtain a semi-finished board;
placing the semi-finished plate into a cold pusher to be cooled to below 80 ℃, taking out the semi-finished plate from the cold pusher, and placing the semi-finished plate into greenhouse steam to be cured for 8 hours to obtain the wood-plastic core plate;
and after the protection laminate, the wood-plastic core plate and the butt joint side plate are processed into a whole, the outer surfaces of the protection laminate and the butt joint side plate are subjected to film coating treatment.
9. The preparation method of the deformation-preventing wood-plastic composite board according to claim 8, wherein the film coating treatment is a coating of a waterproof material, and the formula of the waterproof material comprises a composite microemulsion, a composite auxiliary material, an auxiliary agent, rosin and aluminum sulfate.
CN202210239820.0A 2022-03-12 2022-03-12 Anti-deformation wood-plastic composite board and preparation method thereof Pending CN114474918A (en)

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CN202210239820.0A CN114474918A (en) 2022-03-12 2022-03-12 Anti-deformation wood-plastic composite board and preparation method thereof

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Application Number Priority Date Filing Date Title
CN202210239820.0A CN114474918A (en) 2022-03-12 2022-03-12 Anti-deformation wood-plastic composite board and preparation method thereof

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201645579U (en) * 2010-03-11 2010-11-24 南京汉青竹业有限公司 Corrugated bamboo-wood composite board
CN103061260A (en) * 2013-01-15 2013-04-24 长安大学 Steel bridge deck with rubber filled in bilayer corrugated steel plates
CN109054569A (en) * 2018-07-05 2018-12-21 吕莉 A kind of dedicated plank water-repellent paint in bathroom
CN209277462U (en) * 2018-10-29 2019-08-20 浙江水墨江南新材料科技有限公司 The anti-timber floor that warps
CN210062306U (en) * 2019-05-23 2020-02-14 浙江高度环保科技有限公司 Waterproof folding-resistant paperboard
CN212153892U (en) * 2019-12-31 2020-12-15 永兴县恒鑫高科新型环保建材有限公司 Multilayer wallboard
CN112644131A (en) * 2020-12-17 2021-04-13 涡阳县华丽木业有限公司 Wood-plastic composite board and processing technology thereof
CN217380306U (en) * 2022-01-13 2022-09-06 上海同百建设科技股份有限公司 Sandwich double-layer corrugated steel plate explosion door

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201645579U (en) * 2010-03-11 2010-11-24 南京汉青竹业有限公司 Corrugated bamboo-wood composite board
CN103061260A (en) * 2013-01-15 2013-04-24 长安大学 Steel bridge deck with rubber filled in bilayer corrugated steel plates
CN109054569A (en) * 2018-07-05 2018-12-21 吕莉 A kind of dedicated plank water-repellent paint in bathroom
CN209277462U (en) * 2018-10-29 2019-08-20 浙江水墨江南新材料科技有限公司 The anti-timber floor that warps
CN210062306U (en) * 2019-05-23 2020-02-14 浙江高度环保科技有限公司 Waterproof folding-resistant paperboard
CN212153892U (en) * 2019-12-31 2020-12-15 永兴县恒鑫高科新型环保建材有限公司 Multilayer wallboard
CN112644131A (en) * 2020-12-17 2021-04-13 涡阳县华丽木业有限公司 Wood-plastic composite board and processing technology thereof
CN217380306U (en) * 2022-01-13 2022-09-06 上海同百建设科技股份有限公司 Sandwich double-layer corrugated steel plate explosion door

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Application publication date: 20220513

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