CN106758484B - A kind of preparation method of aramid fiber cardboard - Google Patents
A kind of preparation method of aramid fiber cardboard Download PDFInfo
- Publication number
- CN106758484B CN106758484B CN201510825388.3A CN201510825388A CN106758484B CN 106758484 B CN106758484 B CN 106758484B CN 201510825388 A CN201510825388 A CN 201510825388A CN 106758484 B CN106758484 B CN 106758484B
- Authority
- CN
- China
- Prior art keywords
- aramid fiber
- water
- aramid
- fiber
- cardboard
- 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.)
- Active
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F13/00—Making discontinuous sheets of paper, pulpboard or cardboard, or of wet web, for fibreboard production
- D21F13/10—Making discontinuous sheets of paper, pulpboard or cardboard, or of wet web, for fibreboard production using board presses
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/26—Polyamides; Polyimides
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/10—Composite fibres
Abstract
The invention discloses a kind of preparation methods of aramid fiber cardboard, comprising the following steps: is added to the water after being discongested aramid fiber fibrid respectively with aramid short fiber and carries out mixing dispersion；Then obtained aramid fiber slurries are added in wet paperboard container molding and first carry out homogenate processing, then carry out vacuum filtration dehydration；The aramid fiber l Water Paper blanket obtained after dehydration is first put into a press and carries out room temperature compacting, places into hot press and carries out hot-forming obtaining aramid fiber cardboard.Aramid fiber cardboard is made in one-pass molding of the present invention, and paperboard structure is lumped together, good integrity, has preferable inter-layer bonding force and tensile strength, can long period of soaking in transformer oil without generating lamination, long service life, performance is stablized.
Description
Technical field
The present invention relates to transformer insulated cardboard processing technique fields, and in particular to a kind of preparation side of aramid fiber cardboard
Method.
Background technique
Insulating board is mainly used in oil-immersed transformer, plays a part of insulating supporting.Currently, layer insulating paper
The customary preparation methods of plate are divided into two kinds, one is using wood pulp as raw material, through defibrination process, then manufacture paper with pulp into single page by l Water Paper
L Water Paper, then through moulding cylinder formation wet ground paper, and after through draining, hot-forming cardboard, this method is due to use lignin fiber to be former
Material, preparation process is complex, and single page l Water Paper is suppressed after code paper, and long period of soaking is in transformer oil it is possible that dividing
Layer, and the heat-resisting of lignin fiber, flame retardant property are poor, influence the performance of transformer；Another kind is dry to aramid fiber at high temperature
Paper is overlapped hot-forming cardboard, and this method energy consumption is larger, and is also to make via the dry quires pressurization of aramid fiber, long period of soaking
Also it is possible that layering in transformer oil.
Aramid paper laminating sheet is prepared in the prior art, generally uses chopped aramid fiber and aramid pulp
As raw material, aramid paper is then manufactured paper with pulp into, is superimposed on 140 DEG C, 17.6-35kg/cm2Under the conditions of carry out precompressed, then
In 280 DEG C, 8.8-70.3kg/cm2Under the conditions of carry out it is hot-forming be made.CN1364208A Chinese patent literature discloses one
Kind of Wholly aromatic polyamide fiber paper and the laminated plate material made from it, fibrous paper is the chopped strand by 60wt%-97wt%
It is prepared with the meta-aramid pulp of 3wt%-40wt%, dipping pressing plate is carried out using thermosetting resin maceration extract.
US5948543 U.S. Patent Publication Document it is a kind of using resinoid bond by p- aromatic polyamides and m- aromatic polyamides
The non-laminate base material for making up fabric of aramid fibre is made in fibres bond, it is by one or more layers aromatic polyamides
Laminated material made of sheet material or paper and one or more layers polyester polymers.However, above-mentioned preparation method reported in the literature is deposited
In following problems: (1) using thermosetting resin for the molding of adhesive pressing plate, the pliability for forming back cardboard is poor, is not easy to it
It is processed；(2) composite pressure plate is carried out using polyester film and aramid paper, it is heat-resisting due to containing polyester in plate after molding
Property is not ideal enough；(3) overlapping hot pressing is carried out to aramid paper using high temperature, press temperature consumes energy larger at 280 DEG C or more.
Summary of the invention
The technical problem to be solved by the present invention is to overcome deficiency in the prior art, provide a kind of aramid fiber cardboard
Preparation method, this method obtains aramid fiber cardboard using compacting after disposable suction aramid fiber paper pulp molding aramid fiber l Water Paper slab, and
Non-multilayer individual sheets be overlapped again it is repressed form, preparation process is simple, forming process be not necessarily to other resin adhesives, system
The aramid fiber cardboard good integrity obtained.
In order to solve the above technical problems, technical solution proposed by the present invention are as follows:
A kind of preparation method of aramid fiber cardboard, which comprises the following steps:
(1) aramid fiber fibrid is discongested respectively with aramid short fiber, the aramid fiber obtained after then discongesting sinks
Analysis fiber is added to the water with aramid short fiber mix dispersion, forms aramid fiber slurries；
(2) the aramid fiber slurries that step (1) obtains are added in the wet paperboard container molding with vacuum plant and are first carried out
Homogenate processing, then carries out vacuum filtration pre-dehydration, obtains aramid fiber l Water Paper blanket；
(3) the aramid fiber l Water Paper blanket obtained after step (2) pre-dehydration is directly placed into preformer and is carried out at normal temperature in advance
Pressure water, with the moisture being further discharged in aramid fiber l Water Paper blanket；
(4) the aramid fiber l Water Paper blanket obtained after step (3) draining is placed into hot press and is pressed, is pressed into
The temperature of type at 200 DEG C hereinafter, the pressure of compression moulding in 10MPa hereinafter, obtaining the aramid fiber cardboard.
Aramid fiber cardboard is formed through high temperature and pressure compression moulding or use adhesive again with being made after aramid paper in the prior art
Unlike, then by vacuum filtration dehydration one-pass molding aramid fiber l Water Paper blanket aramid fiber fibre is made through hot pressing process in the present invention
Tie up cardboard.Aramid fiber cardboard pressure and temperature needed for hot-forming process of the invention is all lower, and forming process is not necessarily to
Other adhesive are added, low energy consumption for preparation process, energy conservation and environmental protection.
In above-mentioned preparation method, it is preferred that in the step (1), by quality than aramid fiber fibrid after discongesting: aramid fiber is short
Cut fiber=(30~80): the mixing aramid fiber of (20~70) is added to the water, aramid fiber fibrid and aramid short fiber
Total mass fraction in water is 0.3%~0.5%.
In above-mentioned preparation method, it is preferred that in the step (2), the molding aramid fiber of institute in wet paperboard container molding
Cardboard is quantitatively not higher than 1500g/m2。
In above-mentioned preparation method, it is preferred that in the step (2), be provided on the downside of the wet paperboard container molding true
Empty pump filters the drainage sheet frame of pre-dehydration, and aramid fiber slurries are shaped to aramid fiber l Water Paper blanket on drainage sheet frame.
In above-mentioned preparation method, it is preferred that in the step (3), after the aramid fiber l Water Paper blanket two-berth is with water strainer
It is put into progress prepressing water discharge processing in preformer；In the step (4), the aramid fiber l Water Paper blanket two-berth after water strainer to put
Enter carried out in hot press it is hot-forming.
In above-mentioned preparation method, it is preferred that in the step (3), the pressure control that prepressing water discharge is carried out under room temperature is
0.5MPa~1.5MPa, pressing time are 1~2 minute.
In above-mentioned preparation method, it is preferred that in the step (4), the pressure of the compression moulding is 8MPa~10MPa,
The temperature of compression moulding is 120 DEG C~160 DEG C.However, since the glass transition temperature of aramid fiber is at 270 DEG C or so, therefore
In the conventional technique using aramid paper hot pressing aramid fiber cardboard, to keep aramid fiber adhered to one another close, compression moulding
Pressure is generally higher than 10Mpa, and compression moulding temperature will generally be higher than 200 DEG C, even as high as 250 DEG C or so；The present invention is logical
Crossing one-pass molding has the molded aramid paper plate of reheating after certain thickness aramid fiber l Water Paper blanket, the aramid fiber in aramid fiber l Water Paper blanket
Fiber has had preferable compact structure before hot pressing, therefore the forming temperature needed for subsequent heat pressing process is far below virtue
The glass transition temperature of synthetic fibre fiber, forming temperature are lower than 200 DEG C, and briquetting pressure is also below 10Mpa, preparation process energy-saving ring
It protects.
In above-mentioned preparation method, it is preferred that in the step (4), the time of compression moulding presses the thickness of aramid fiber cardboard
Degree setting, every 1mm are 10 minutes.
Compared with prior art, the present invention having the advantage that
(1) present invention uses aramid fiber for raw material, and cardboard obtained has preferable heat-resisting, flame retardant property.
(2) aramid fiber cardboard is made in one-pass molding of the present invention, and paperboard structure is lumped together, good integrity, can avoid producing
The lamination that product occur in use.
(3) preparation process of the present invention is simple, and forming process is not necessarily to other resin adhesives, and low energy consumption, and production cost is low.
Specific embodiment
Embodiment 1
A kind of preparation method of aramid fiber cardboard of the present invention, comprising the following steps:
(1) it fiber is respectively adopted with aramid short fiber in aramid fiber fibrid discongests device and discongest, then will discongest
Quality is than aramid fiber fibrid afterwards: aramid short fiber=50:50 mixing aramid fiber, which is added to the water, to be dispersed, mixing
Aramid fiber slurries are formed uniformly, aramid fiber fibrid and the total mass fraction of aramid short fiber in water are 0.5%；
(2) the 50kg aramid fiber slurries that step (1) obtains are added to vacuum plant and downside is provided with drainage sheet frame
0.5m × 0.5m rectangular wet paperboard container molding in first carry out homogenate processing, then carry out vacuum filtration pre-dehydration, filtering
Aramid fiber l Water Paper blanket is obtained on water sheet frame；
(3) the aramid fiber l Water Paper blanket obtained after step (2) pre-dehydration is taken out, two-berth is to be put into preformer after water strainer
In carry out prepressing water discharge at normal temperature, with the moisture being further discharged in aramid fiber l Water Paper blanket, the pressure of press is 1MPa, compacting
Time is 1.5 minutes；
(4) the upper and lower aramid fiber l Water Paper blanket for being covered with water strainer obtained after step (3) draining is taken out after release, is put into heat
It is pressed in press, the pressure of compression moulding is 8MPa, and the temperature of compression moulding is 150 DEG C, the time of compression moulding
It is 20 minutes, aramid fiber cardboard of the invention is then obtained after release, cooling, die sinking.
Embodiment 2
A kind of preparation method of aramid fiber cardboard of the present invention, comprising the following steps:
(1) it fiber is respectively adopted with aramid short fiber in aramid fiber fibrid discongests device and discongest, then will discongest
Quality is than aramid fiber fibrid afterwards: aramid short fiber=60:40 mixing aramid fiber, which is added to the water, to be dispersed, mixing
Aramid fiber slurries are formed uniformly, aramid fiber fibrid and the total mass fraction of aramid short fiber in water are 0.4%；
(2) the 50kg aramid fiber slurries that step (1) obtains are added to vacuum plant and downside is provided with drainage sheet frame
0.5m × 0.5m rectangular wet paperboard container molding in first carry out homogenate processing, then carry out vacuum filtration pre-dehydration, filtering
Aramid fiber l Water Paper blanket is obtained on water sheet frame；
(3) the aramid fiber l Water Paper blanket obtained after step (2) pre-dehydration is taken out, two-berth is to be put into preformer after water strainer
In carry out prepressing water discharge at normal temperature, with the moisture being further discharged in aramid fiber l Water Paper blanket, the pressure of press is 0.8MPa, pressure
Time processed is 1 minute；
(4) the upper and lower aramid fiber l Water Paper blanket for being covered with water strainer obtained after step (3) draining is taken out after release, is put into heat
It is pressed in press, the pressure of compression moulding is 8MPa, and the temperature of compression moulding is 140 DEG C, the time of compression moulding
It is 15 minutes, aramid fiber cardboard of the invention is then obtained after release, cooling, die sinking.
Embodiment 3
A kind of preparation method of aramid fiber cardboard of the present invention, comprising the following steps:
(1) it fiber is respectively adopted with aramid short fiber in aramid fiber fibrid discongests device and discongest, then will discongest
Quality is than aramid fiber fibrid afterwards: aramid short fiber=40:60 mixing aramid fiber, which is added to the water, to be dispersed, mixing
Aramid fiber slurries are formed uniformly, aramid fiber fibrid and the total mass fraction of aramid short fiber in water are 0.4%；
(2) the 50kg aramid fiber slurries that step (1) obtains are added to vacuum plant and downside is provided with drainage sheet frame
0.5m × 0.5m rectangular wet paperboard container molding in first carry out homogenate processing, then carry out vacuum filtration pre-dehydration, filtering
Aramid fiber l Water Paper blanket is obtained on water sheet frame；
(3) the aramid fiber l Water Paper blanket obtained after step (2) pre-dehydration is taken out, two-berth is to be put into preformer after water strainer
In carry out prepressing water discharge at normal temperature, with the moisture being further discharged in aramid fiber l Water Paper blanket, the pressure of press is 0.6MPa, pressure
Time processed is 1 minute；
(4) the upper and lower aramid fiber l Water Paper blanket for being covered with water strainer obtained after step (3) draining is taken out after release, is put into heat
It is pressed in press, the pressure of compression moulding is 10MPa, and the temperature of compression moulding is 140 DEG C, the time of compression moulding
It is 15 minutes, aramid fiber cardboard of the invention is then obtained after release, cooling, die sinking.
After tested, the performance parameter for the aramid fiber cardboard that 1-3 of the embodiment of the present invention is obtained is as shown in table 1.
The performance parameter record sheet of 1 aramid fiber cardboard of table
Can be seen that the aramid fiber cardboard that the present invention is prepared from the data of table 1 has preferable inter-layer bonding force
And tensile strength, can long period of soaking in transformer oil without generating lamination, long service life, performance is stablized.
Claims (2)
1. a kind of preparation method of aramid fiber cardboard, which comprises the following steps:
(1) aramid fiber fibrid is discongested respectively with aramid short fiber, the aramid fiber precipitating obtained after then discongesting is fine
Dimension is added to the water with aramid short fiber mix dispersion, forms aramid fiber slurries；
(2) the aramid fiber slurries that step (1) obtains are added in the wet paperboard container molding with vacuum plant and first carry out homogenate
Processing, then carries out vacuum filtration pre-dehydration, obtains aramid fiber l Water Paper blanket；
(3) the aramid fiber l Water Paper blanket obtained after step (2) pre-dehydration is directly placed into preformer and carries out pre- pressure at normal temperature
Water, with the moisture being further discharged in aramid fiber l Water Paper blanket；
(4) the aramid fiber l Water Paper blanket obtained after step (3) draining is placed into hot press and is pressed, compression moulding
Temperature at 200 DEG C hereinafter, the pressure of compression moulding in 10MPa hereinafter, obtaining the aramid fiber cardboard；
In the step (2), the drainage sheet frame of vacuum filtration pre-dehydration, virtue are provided on the downside of the wet paperboard container molding
Synthetic fibre slurries are shaped to aramid fiber l Water Paper blanket on drainage sheet frame；
In the step (3), the aramid fiber l Water Paper blanket two-berth is carried out at prepressing water discharge with being put into preformer after water strainer
Reason；In the step (4), the aramid fiber l Water Paper blanket two-berth be put into after water strainer in hot press carry out it is hot-forming；
In the step (1), by quality than aramid fiber fibrid after discongesting: aramid short fiber=(30 ~ 80): (20 ~ 70) are mixed
It closes aramid fiber to be added to the water, aramid fiber fibrid and the total mass fraction of aramid short fiber in water are 0.3% ~ 0.5%；
In the step (3), the pressure control that prepressing water discharge is carried out under room temperature is 0.5MPa ~ 1.5MPa, and the pressing time is 1 ~ 2
Minute；
In the step (4), the pressure of the compression moulding is 8MPa ~ 10MPa, and the temperature of compression moulding is 120 DEG C ~ 160 DEG C；
In the step (4), the time of compression moulding is set by the thickness of aramid fiber cardboard, and every 1mm is 10 minutes.
2. preparation method as described in claim 1, which is characterized in that in the step (2), in wet paperboard container molding institute at
The aramid fiber cardboard of type is quantitatively not higher than 1500g/m2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510825388.3A CN106758484B (en) | 2015-11-24 | 2015-11-24 | A kind of preparation method of aramid fiber cardboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510825388.3A CN106758484B (en) | 2015-11-24 | 2015-11-24 | A kind of preparation method of aramid fiber cardboard |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106758484A CN106758484A (en) | 2017-05-31 |
| CN106758484B true CN106758484B (en) | 2019-08-09 |
Family
ID=58964633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510825388.3A Active CN106758484B (en) | 2015-11-24 | 2015-11-24 | A kind of preparation method of aramid fiber cardboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106758484B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110746746A (en) * | 2019-09-26 | 2020-02-04 | 四川东材科技集团股份有限公司 | Medium-density aramid fiber paper laminated board and preparation method thereof |
| CN110670415A (en) * | 2019-09-26 | 2020-01-10 | 四川东材科技集团股份有限公司 | High-density aramid fiber paper laminated board and preparation method thereof |
| CN110886145A (en) * | 2019-12-17 | 2020-03-17 | 株洲时代华先材料科技有限公司 | Meta-aramid thick paper hot press forming method |
| CN111472191A (en) * | 2020-04-14 | 2020-07-31 | 山东聚芳新材料股份有限公司 | Para-aramid fiber plate and preparation method thereof |
| CN115157516A (en) * | 2022-09-06 | 2022-10-11 | 湖南搏盛天弘新材料技术有限公司 | Preparation method of novel carbon fiber insulation board |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2234967Y (en) * | 1995-02-23 | 1996-09-11 | 韦绍廉 | Forming machine for loose mica paper board |
| CN1834342A (en) * | 2006-04-13 | 2006-09-20 | 烟台氨纶股份有限公司 | Meta aramid fibre paper and prepn. process |
| CN101781869A (en) * | 2009-09-21 | 2010-07-21 | 湖南广信电工科技股份有限公司 | Drying process of super thick insulated pressboard |
| CN102261009A (en) * | 2011-07-13 | 2011-11-30 | 钟洲 | Preparation method of aramid insulating paper |
| CN104294699A (en) * | 2014-09-15 | 2015-01-21 | 陕西科技大学 | Laboratory paper sheet making machine |
| CN104343041A (en) * | 2014-10-15 | 2015-02-11 | 中国海诚工程科技股份有限公司 | Preparation method of meta-aramid paper |
| CN104736765A (en) * | 2013-01-09 | 2015-06-24 | 杜邦帝人先进纸（日本）有限公司 | Process for producing raw material for papermaking, obtained raw material for papermaking, and heat-resistant electrical insulating sheet material obtained using said raw material |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787665A (en) * | 2009-09-21 | 2010-07-28 | 湖南广信电工科技股份有限公司 | Production process of ultrathick insulating paperboard |
| JP2013095057A (en) * | 2011-11-01 | 2013-05-20 | Du Pont Teijin Advanced Paper Kk | Aramid-polyolefin laminate |
-
2015
- 2015-11-24 CN CN201510825388.3A patent/CN106758484B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2234967Y (en) * | 1995-02-23 | 1996-09-11 | 韦绍廉 | Forming machine for loose mica paper board |
| CN1834342A (en) * | 2006-04-13 | 2006-09-20 | 烟台氨纶股份有限公司 | Meta aramid fibre paper and prepn. process |
| CN101781869A (en) * | 2009-09-21 | 2010-07-21 | 湖南广信电工科技股份有限公司 | Drying process of super thick insulated pressboard |
| CN102261009A (en) * | 2011-07-13 | 2011-11-30 | 钟洲 | Preparation method of aramid insulating paper |
| CN104736765A (en) * | 2013-01-09 | 2015-06-24 | 杜邦帝人先进纸（日本）有限公司 | Process for producing raw material for papermaking, obtained raw material for papermaking, and heat-resistant electrical insulating sheet material obtained using said raw material |
| CN104294699A (en) * | 2014-09-15 | 2015-01-21 | 陕西科技大学 | Laboratory paper sheet making machine |
| CN104343041A (en) * | 2014-10-15 | 2015-02-11 | 中国海诚工程科技股份有限公司 | Preparation method of meta-aramid paper |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106758484A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106758484B (en) | A kind of preparation method of aramid fiber cardboard | |
| CN1128046C (en) | Process for preparing middle-density rice straw board | |
| CN102320068B (en) | Improved method for manufacturing high-frequency heated bamboo/wood recombined material | |
| CN100554581C (en) | Multiple proportional layered compound polyfiber amide paper of manufacturing paper with pulp and preparation method thereof | |
| CN100429057C (en) | Method for manufacturing fiberboard of cotton stalk in middle density through dry process | |
| CN101407076A (en) | High-density bamboo beaverboard | |
| CN110509367B (en) | Continuous production line and production process of plywood | |
| RU2007113163A (en) | LAMINATED PRODUCTS AND METHODS FOR THEIR MANUFACTURE | |
| TW201221569A (en) | Wood fiber board and manufacturing method thereof | |
| CN101450493A (en) | Production method of modified wood, bamboo glued mould | |
| CN100381263C (en) | Method for making castor stalk chipboard | |
| CN112077954B (en) | Preparation method of two-dimensional woven green environment-friendly high-strength wood-based composite material | |
| CN101457503B (en) | High strength fiberboard and production method thereof | |
| CN106738111B (en) | Bending-resistant plywood and manufacturing method thereof | |
| CN103568447B (en) | Device laminated into type and prepare the method for thermosetting polymer based composites | |
| CN104708884A (en) | Multilayer microporous fiber filter plate production process | |
| CN103481751A (en) | High-strength PU (polyurethane) skylight pulling plate with sandwich structure and preparation method thereof | |
| CN103978537A (en) | One-time formed methanal-free compound panel and processing technique | |
| CN205970203U (en) | Delamination resistance can good combined material | |
| CN101564863B (en) | Process for producing improved medium-density strawboard | |
| CN101659071A (en) | Manufacturing method of zero-formaldehyde plywood | |
| CN106319979B (en) | A kind of method for improving composite material delamination resistance energy | |
| CN101745946A (en) | Preparation method of self-bonding bark board with three-layered structure | |
| CN101314228A (en) | Bamboo wood reinforced sheet material and disposal multi-layer integrated manufacturing method | |
| KR101547776B1 (en) | Aramid wet-laid non woven fabrics for honeycomb and process of producing thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |