CN104448388B - Special calcium metasilicate fiber for rich mineral paper and preparation method of special calcium metasilicate fiber - Google Patents
Special calcium metasilicate fiber for rich mineral paper and preparation method of special calcium metasilicate fiber Download PDFInfo
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- CN104448388B CN104448388B CN201410608018.XA CN201410608018A CN104448388B CN 104448388 B CN104448388 B CN 104448388B CN 201410608018 A CN201410608018 A CN 201410608018A CN 104448388 B CN104448388 B CN 104448388B
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Abstract
The invention discloses a special calcium metasilicate fiber for rich mineral paper. The special calcium metasilicate fiber for rich mineral paper is characterized by being formed by acicular wollastonite and kieselguhr which are connected in an interspersing manner, having a fibrous flexible network fiber ball structure and likely to disperse in a small amount of high-molecular polymer to form rich mineral paper. Different from the traditional powder fibers such as calcium carbonate and mineral fiber which are used as fillers individually in rich mineral paper, the special calcium metasilicate fiber disclosed by the invention has the beneficial effects that approximately spherical kieselguhr which has an elastic buffer effect is used for effective avoiding the defect that the rich mineral paper is compacted because of extrusion by screws and calendering by a calendar in the processing process of the rich mineral paper, so that the processed rich mineral paper fully retains a fibrous network support property and a fluffy characteristic, the density of the rich mineral paper is reduced, the processed rich mineral paper has the advantages of good handfeel and light weight and is closer to traditional plant fiber paper. Furthermore, the invention provides a preparation method of the special calcium metasilicate fiber for rich mineral paper. According to the preparation method, through acidifying, styrene soaking, interspersing and polymerizing, single fiber-bundles are well dispersed to ensure flexibility, have nonpolarity and also have good compatibility with high polymer material.
Description
Technical field
The present invention relates to stone paper field, specifically the invention provides a kind of calcium silicates mineral that can be used for stone paper are fine
Dimension with and preparation method thereof.
Background technology
Cai Lun is using the outstanding innovation and creation that the technology of Plant fiber's papermaking is on history of human civilization, the appearance of paper
Bring great convenience for the life of the mankind, study.Paper technology is developed so far through constantly change, has nearly reached perfection
Stage.But as paper is in the extensive application in the fields such as packaging, demand is increasing, production needs to consume substantial amounts of forest money
Source, produces substantial amounts of waste water.Stern challenge hence with the technological side neck of Plant fiber's papermaking.
In order to reduce demand of the papermaking to Plant fiber, occur in that by the use of mineral fibres and replace Activities of Some Plants fiber as paper
Slurry raw material.Chinese invention patent CN1242116C discloses a kind of paper grade (stock) modified grammite mineral composition fiber and uses its papermaking
Method, wollastonite by modification, adds the compound fibre of modified grammite mineral of 5-50% by the invention during with slurry
The Plant fiber of dimension and 50-95% is used for papermaking, can be effectively reduced production cost.But wollastonite fibre is due to being rigid, paper
The performance opened still relies on the Plant fiber of flexibility, and replacement amount is limited, and in addition wollastonite fibre substituted plant fiber remains a need for passing
The paper pulp papermaking technique of system, and produce large amount of sewage.Therefore, the papermaking with fibre pulp as main raw material(s), due to paper pulp system
Standby complex process water pollution is serious, and greatly threat is caused to environment.
In order to further thoroughly break away from dependence of the papermaking to Plant fiber, the discharge of wastewater of papermaking is eliminated, one kind is by high score
The inorganic powder material composition such as sub- polymer and Calcium Carbonate, the stone paper obtained by thermoplastic mixing, blowing or calendering is preferable
Dependence of the paper to process of plant fiber pulp is solved, and manufacturing process is not fallen trees without the need for Plant fiber, does not discharge useless
Water, is not required to add bleach, strong acid, highly basic, will not be to environment.From the patent documentation reported at present, stone
Paper is all first, using surface couple activation process is carried out to inorganic mineral powder, to improve its compatibility with polymer, Ran Houzai
The kneading effect that the shear action produced when being extruded using spiro rod reaction machine or banbury are produced is scattered in inorganic mineral powder
In high molecular polymer, stone paper is obtained by blowing, calendering.China Patent Publication No. CN1378909A proposes a kind of environmental protection
Paper is logical in O-shaped die orifice by the polyvinyl resin and auxiliary agent of the inorganic mineral powder of 56-80% and 43-18% by extruder grain
Cross blowing and obtain stone paper；China Patent Publication No. CN1202166C is reported calcium carbonate superfine powder Jing coupling agent surface treatments
Afterwards, successively with deliver to flattener and prolong molded stone paper after antistatic additive, coloring agent, lubricant and vistanex mixing extrusion
Manufacture method；China Patent Publication No. CN101462387A is equally reported ultrafine inorganic powder Jing Aluminate coupling processing
The method for obtaining paper grade (stock) pellet with high density polyethylene (HDPE) melting extrusion afterwards.Break away from by the stone paper for processing main body of inorganic particle
Dependence to paper pulp, production process no longer produces contaminated wastewater environment.But stone paper is due to using in a large number the powder body such as Calcium Carbonate,
Paper lacks the supportive of fiber, and feel is relatively sunk, and lacks paper sense, and printing writing quality is poor.For this purpose, Chinese invention patent
CN104119600A discloses a kind of mineral fibres filling high-strength environment-friendly stone paper, and its raw material is by high density polyethylene (HDPE), linear
Ldpe resin, inorganic particle, nonmetallic ore fibres are formed by combining, by using fiber with reach drop proportion,
Improve hardness, improve papery sense, improve the purposes such as printing effect and absorbency.But because stone paper is by screw extruding, pressure
Prolong and be molded with, thus mineral fibres is difficult to be sufficiently reserved for its network structure when preparing stone paper, so that mineral are fine
Dimension be difficult in stone paper play fiber mesh-supported, so as to cause stone paper yet suffer from compared with conventional paper feel compared with
It is heavy, lack paper sense, so as to hinder the popularization and application process of stone paper.
The content of the invention
In order that the performance of stone paper is closer to traditional plant fibre paper so as to form threadiness in preparation process
Network structure, with the characteristic that lightweight is fluffy, the present invention provides a kind of stone paper special ca silicate fibre, and the fiber is by needle-like
Wollastonite is interspersed with kieselguhr to be connected formation, with fibrous flexible fiber ball network structure, easily in a small amount of polyphosphazene polymer
Dispersion in compound forms the fluffy stone paper of lightweight.Further provide for the preparation method of the special ca silicate fibre of stone paper.
A kind of special ca silicate fibre of stone paper of the present invention adopts the following technical scheme that realization：
A kind of special ca silicate fibre of stone paper, is characterized in that by acicular wollastonite and the interspersed connection shape of approximate kieselguhr
Into fibrous flexible network structure, according to following parts by weight meter raw material constitute：
Wollastonite 60-80 parts,
Kieselguhr 20-40 parts,
In above-mentioned composition, described wollastonite selects the wollastonite of fibrous crystal structure；Described kieselguhr selects particle diameter
Less than the granule of 30 μm of almost sphericals, microcellular structure of the kieselguhr with unique ordered arrangement, porosity are high, pore volume is big,
Light weight, bulk density are little, specific surface area is big.
Active force between wollastonite fibre shape monocrystalline is mainly Van der Waals force and hydrogen bond, in the presence of mechanical force, is divided
From with resolve into one-dimensional single crystal, its needle-like beam is broken, and by diatomite particle IPN with the almost spherical of porous net is formed
Network structure, makes fiber form the fibrous nodules with certain elasticity.
A kind of preparation method of the special ca silicate fibre of stone paper of the present invention, each composition with weight portion described above is as original
Material, is prepared in the following manner：
（1）There is the wollastonite of fibrous crystal structure the solution beam that suspends is carried out in airflow milling 60-80 weight portions, classification turns
Speed control obtains acicular wollastonite micropowder in 2000-2500rpm by air-flow Supersonic Solution beam, classification；
（2）By step（1）The acicular wollastonite micropowder for obtaining adds the dilute sulfuric acid stirring acidifying 2-3h that concentration is 30-50%,
Then filter, with excessive styrene liquid 24h soaked, the single fiber-bundles for making acicular wollastonite are impregnated with completely by styrene liquid,
Unnecessary styrene is filtered dry by centrifuge and obtains modified grammite；
（3）The kieselguhr of 20-40 weight portions is added into the dilute sulfuric acid stirring acidifying 2-3h that concentration is 30-50%, then mistake
Filter, with excessive styrene immersion bubble 24h, makes kieselguhr be impregnated with completely by styrene liquid, and by centrifuge unnecessary benzene is filtered dry
Ethylene obtains modification infusorial earth；
（4）By step（1）Modified grammite, the step for obtaining（2）The modification infusorial earth for obtaining sends into fluidisation with initiator
Bed reactor, sets fluidized-bed reactor temperature as 80-100 DEG C, is suspended in modified grammite, modification infusorial earth by air
Among the fluid of motion so that acicular wollastonite is interspersed in diatomaceous micropore, by initiator make wollastonite single fiber-bundles,
Styrene polymerization that kieselguhr surface is impregnated with simultaneously connects, and is formed and has the calcium silicates of fibrous flexible fiber ball network structure fine
Dimension.
In above-mentioned preparation method, step（1）Described airflow milling is ground from eddy airstream, flat airflow milling, by nozzle
Compressed air is changed into high velocity air, the suspension shearing when material sends into pulverizing chamber by feeder by high velocity air is made
With, make wollastonite that refinement solution beam is carried out under complete suspended state, obtain needle shape wollastonite powder.
In above-mentioned preparation method, step（4）Described initiator is selected in oxidation hydroxyl diisopropylbenzene (DIPB), tetren extremely
Few one kind, initiator usage amount is the 0.3-0.5% of wollastonite and kieselguhr gross mass.
A kind of special ca silicate fibre of stone paper of the present invention, is interspersed in kieselguhr duct by acicular wollastonite and forms net
Shape structure, and polymerization is caused so that acicular wollastonite is connected shape with kieselguhr by fiber surface acidifying, the styrene being impregnated with
Into ca silicate fibre.By interspersed connection, one kind of formation has spherical and fibrous flexible network structure concurrently, for stone paper
Make to can ensure that the fiber support and bulkiness that paper is good, with low-density characteristic.Interspersed network structure passes through what is be impregnated with
Styrene causes polymerization, gives by with nonpolar, thus the compatibility well, can be direct when process with high molecular polymer
As stone paper special raw material.As stone paper PP Pipe Compound, can be with the polyethylene of the mass ratio of 80-90% and 10-20%, poly-
At least one of vinyl chloride, polypropylene, polyethylene terephthalate by Screw Extrusion machine, so as to using blowing,
Calendering or curtain coating obtain stone paper.
The special ca silicate fibre of a kind of stone paper of the present invention, by acicular wollastonite and diatomaceous interspersed connection, it is ensured that
The space structure of fiber, the kieselguhr of almost spherical has elastic buffer, can be prevented effectively from due to spiral shell in stone paper conversion
Bar extruding, calender calendering cause the closely knit defect of stone paper, make to be sufficiently reserved in stone paper with fibrous web-like supportive
And condrapable nature so that stone paper feel is good, light weight, closer to traditional plant fibre paper.The fibre that the present invention is obtained
Dimension ball is with film-grade HDPE with mass ratio 8:2 in high-speed mixer mix homogeneously, end count refining the spiro rod reaction type extruder of formula three
Extruding pelletization, by the blowing of plastics general purpose film blow moulding machine the stone paper that thickness is 0.04mm is obtained.Its performance and thickness of the same race
Traditional paper contrast such as following table：
| Detection project | The stone paper prepared using mineral fibres of the present invention | Condition of equivalent thickness plant fiber paper |
| Thickness（mm） | 0.04 | 0.04 |
| Quantitatively（g/m2） | 32 | 33 |
| Density g/cm3 | 0.80 | 0.82 |
| Opacity % | 89 | 93 |
| Smoothness（Positive and negative is average）s | 108 | 92 |
| Deflection（Laterally）mN·m | 0.42 | 0.28 |
| Ink absorption % | 22 | 20 |
| Picking speed m/s | 1.8 | 1.1 |
By test analysis, mineral fibres of the present invention is used to prepare stone paper, makes stone paper combination property and Plant fiber
Paper is more nearly, and especially supportive deflection exceedes traditional fibre paper, the close plant fiber paper of density, and with Plant fiber
The fluffy sense of lightweight of paper, printing-ink absorbability, picking speed are higher than plant fiber paper.
Special ca silicate fibre of a kind of stone paper of the present invention and preparation method thereof, the characteristics of project compared with prior art and
Beneficial effect is：
1st, the special ca silicate fibre of a kind of stone paper of the invention, is formed by acicular wollastonite with diatomaceous interspersed connection
A kind of fibrous nodules, it is ensured that the space structure of fiber, for during stone paper conversion, different from traditional Calcium Carbonate, mineral fibres
Use as single filler in stone paper Deng powder body dimension, but with fibrous web-like supportive and condrapable nature, make stone paper
Density is reduced, and overcomes that common stones paper density is big, the defect that feel is heavy, shows as that stone paper feel is good, light weight, closer
In traditional plant fibre paper.
2nd, the special ca silicate fibre of a kind of stone paper of the invention, is impregnated with, interts and is polymerized by acidifying, styrene so that
Single fiber-bundles are well dispersed, good with the macromolecular material compatibility with nonpolar in flexibility.
3rd, the special ca silicate fibre of a kind of stone paper of the invention, can be with the mass ratio of 80-90% and the poly- second of 10-20%
At least one of alkene, polrvinyl chloride, polypropylene, polyethylene terephthalate pass through screw extruder thermoplasticity processing, from
And obtain stone paper using blowing, calendering or curtain coating.
4th, a kind of preparation method of the special ca silicate fibre of stone paper of the invention, preparation technology is easily-controllable, can serialization closing
Formula is produced, and is suitable for large-scale production application.
Description of the drawings
Fig. 1 is a kind of special ca silicate fibre of stone paper of the invention by acicular wollastonite and almost spherical porous kieselguhr
The fibrous nodules structural representation that the interspersed connection of grain is formed.
Specific embodiment
Below by way of specific embodiment, the present invention is described in further detail, but this should not be interpreted as into the present invention
Scope be only limitted to Examples below.In the case of without departing from said method thought of the present invention, according to ordinary skill
Various replacements or change that knowledge and customary means are made, should be included in the scope of the present invention.
Embodiment 1
（1）There is the wollastonite of fibrous crystal structure the solution beam that suspends, classification are carried out in flat airflow milling 60 weight portions
Rotating speed control obtains acicular wollastonite micropowder in 2000rpm by air-flow Supersonic Solution beam, classification；
（2）By step（1）The acicular wollastonite micropowder for obtaining adds the dilute sulfuric acid stirring acidifying 2-3h that concentration is 40%, so
After filter, with excessive styrene immersion bubble 24h, the single fiber-bundles for making acicular wollastonite are impregnated with completely by styrene liquid, are passed through
Centrifuge is filtered dry unnecessary styrene and obtains modified grammite；
（3）The kieselguhr of 40 weight portions is added into the dilute sulfuric acid stirring acidifying 2-3h that concentration is 30%, is then filtered, it is used
The styrene immersion bubble 24h of amount, makes kieselguhr be impregnated with completely by styrene liquid, is filtered dry unnecessary styrene by centrifuge and obtains
Modification infusorial earth；
（4）By step（1）Modified grammite, the step for obtaining（2）The oxidation of the modification infusorial earth and 0.3 weight portion that obtain
Hydroxyl diisopropylbenzene (DIPB) sends into fluidized-bed reactor, sets fluidized-bed reactor temperature as 100 DEG C, by air by modified silicon ash
Stone, modification infusorial earth are suspended among the fluid of motion, so that acicular wollastonite is interspersed in diatomaceous micropore, by oxidation
Hydroxyl diisopropylbenzene (DIPB) causes the styrene polymerization for being impregnated with wollastonite single fiber-bundles and kieselguhr and connects, and forms fibrous nodules.
By the fibrous nodules for obtaining and film-grade HDPE with mass ratio 8:2 in high-speed mixer mix homogeneously, end count refining formula
Three spiro rod reaction type extruder extruding pelletizations, by the blowing of plastics general purpose film blow moulding machine the stone that thickness is 0.04mm is obtained
Paper.
Embodiment 2
（1）The wollastonite that 80 weight portions have fibrous crystal structure is carried out into the solution beam that suspends, classification in eddy airstream mill
Rotating speed control obtains acicular wollastonite micropowder in 2000rpm by air-flow Supersonic Solution beam, classification；
（2）By step（1）The acicular wollastonite micropowder for obtaining adds the dilute sulfuric acid stirring acidifying 2-3h that concentration is 50%, so
After filter, with excessive styrene immersion bubble 24h, the single fiber-bundles for making acicular wollastonite are impregnated with completely by styrene liquid, are passed through
Centrifuge is filtered dry unnecessary styrene and obtains modified grammite；
（3）The kieselguhr of 20 weight portions is added into the dilute sulfuric acid stirring acidifying 2-3h that concentration is 50%, is then filtered, it is used
The styrene immersion bubble 24h of amount, makes kieselguhr be impregnated with completely by styrene liquid, is filtered dry unnecessary styrene by centrifuge and obtains
Modification infusorial earth；
（4）By step（1）Modified grammite, the step for obtaining（2）The modification infusorial earth for obtaining and the tetrem of 0.4 weight portion
Support five amine and send into fluidized-bed reactor, set fluidized-bed reactor temperature as 80 DEG C, by air by modified grammite, modified silicon
Diatomaceous earth is suspended among the fluid of motion, so that acicular wollastonite is interspersed in diatomaceous micropore, by initiator silicon ash is made
Styrene polymerization that stone single fiber-bundles and kieselguhr are impregnated with simultaneously connects, and forms the fiber with fibrous flexible network structure
Ball.
By the fibrous nodules for obtaining and PET with mass ratio 9:1 mix homogeneously, is blended pelletize in banbury, in SL1200 pressures
Casting machine drawing and forming is obtained stone paper.
Embodiment 3
（1）The wollastonite that 70 weight portions have fibrous crystal structure is carried out into the solution beam that suspends, classification in eddy airstream mill
Rotating speed control obtains acicular wollastonite micropowder in 2300rpm by air-flow Supersonic Solution beam, classification；
（2）By step（1）The acicular wollastonite micropowder for obtaining adds the dilute sulfuric acid stirring acidifying 2-3h that concentration is 30%, so
After filter, with excessive styrene immersion bubble 24h, the single fiber-bundles for making acicular wollastonite are impregnated with completely by styrene liquid, are passed through
Centrifuge is filtered dry unnecessary styrene and obtains modified grammite；
（3）The kieselguhr of 30 weight portions is added into the dilute sulfuric acid stirring acidifying 2-3h that concentration is 50%, is then filtered, it is used
The styrene immersion bubble 24h of amount, makes kieselguhr be impregnated with completely by styrene liquid, is filtered dry unnecessary styrene by centrifuge and obtains
Modification infusorial earth；
（4）By step（1）Modified grammite, the step for obtaining（2）The oxidation of the modification infusorial earth and 0.5 weight portion that obtain
Hydroxyl diisopropylbenzene (DIPB) sends into fluidized-bed reactor, sets fluidized-bed reactor temperature as 100 DEG C, by air by modified silicon ash
Stone, modification infusorial earth are suspended among the fluid of motion, so that acicular wollastonite is interspersed in diatomaceous micropore, by causing
Agent makes the styrene polymerization that wollastonite single fiber-bundles and kieselguhr is impregnated with and connects, and is formed and has fibrous flexible network structure
Fibrous nodules.
By the fibrous nodules for obtaining and polypropylene HP624J with mass ratio 17:3 mix homogeneously, directly in the T of double-deck extruder
Stone paper is obtained after pattern head extrusion with SYS6S- Ф 230 × 630 6 roll calendar groups calendering.
Embodiment 4
（1）The wollastonite that 80 weight portions have fibrous crystal structure is carried out into the solution beam that suspends, classification in eddy airstream mill
Rotating speed control obtains acicular wollastonite micropowder in 2500rpm by air-flow Supersonic Solution beam, classification；
（2）By step（1）The acicular wollastonite micropowder for obtaining adds the dilute sulfuric acid stirring acidifying 2-3h that concentration is 40%, so
After filter, with excessive styrene immersion bubble 24h, the single fiber-bundles for making acicular wollastonite are impregnated with completely by styrene liquid, are passed through
Centrifuge is filtered dry unnecessary styrene and obtains modified grammite；
（3）The kieselguhr of 20 weight portions is added into the dilute sulfuric acid stirring acidifying 2-3h that concentration is 40%, is then filtered, it is used
The styrene immersion bubble 24h of amount, makes kieselguhr be impregnated with completely by styrene liquid, is filtered dry unnecessary styrene by centrifuge and obtains
Modification infusorial earth；
（4）By step（1）Modified grammite, the step for obtaining（2）The modification infusorial earth for obtaining and the tetrem of 0.4 weight portion
Support five amine send into fluidized-bed reactor, set fluidized-bed reactor temperature as 100 DEG C, by air by modified grammite, be modified
Kieselguhr is suspended among the fluid of motion, so that acicular wollastonite is interspersed in diatomaceous micropore, by initiator silicon is made
Styrene polymerization that lime stone single fiber-bundles and kieselguhr are impregnated with simultaneously connects, and forms the fiber with fibrous flexible network structure
Ball.
By the fibrous nodules for obtaining and HDPE6098 with mass ratio 10：1 mix homogeneously, the material of mix homogeneously is introduced and is squeezed
Go out to roll stretcher, obtained by double screw rod extruder reactive extrursion, calendering, 1.5 times of longitudinal stretching, 3 times of cross directional stretch
To stone paper.
Claims (5)
1. a kind of special ca silicate fibre of stone paper, is characterized in that being connected by acicular wollastonite is interspersed with the kieselguhr of almost spherical
The fibrous nodules with certain elasticity for being formed, constitute according to the raw material of following parts by weight meter：
Wollastonite 60-80 parts,
Kieselguhr 20-40 parts,
Wherein, wollastonite of the described wollastonite from fibrous crystal structure；Described kieselguhr is near less than 30 μm from particle diameter
Spheroidal granule.
2. a kind of special ca silicate fibre of stone paper according to claim 1, is characterized in that the special calcium silicates of stone paper are fine
The preparation method of dimension is prepared in the following manner：
（1）There is the wollastonite of fibrous crystal structure the solution beam that suspends is carried out in airflow milling 60-80 weight portions, be classified rotating speed control
System obtains acicular wollastonite micropowder in 2000-2500rpm by air-flow Supersonic Solution beam, classification；
（2）By step（1）The acicular wollastonite micropowder for obtaining adds the dilute sulfuric acid stirring acidifying 2-3h that concentration is 30-50%, then
Filter, with excessive styrene immersion bubble 24h, the single fiber-bundles for making acicular wollastonite are impregnated with completely by styrene liquid, by from
Scheming is filtered dry unnecessary styrene and obtains modified grammite；
（3）The kieselguhr of 20-40 weight portions is added into the dilute sulfuric acid stirring acidifying 2-3h that concentration is 30-50%, is then filtered, used
Excessive styrene immersion bubble 24h, makes kieselguhr be impregnated with completely by styrene liquid, is filtered dry unnecessary styrene by centrifuge and obtains
To modification infusorial earth；
（4）By step（2）Modified grammite, the step for obtaining（3）It is anti-that the modification infusorial earth for obtaining sends into fluid bed with initiator
Device is answered, fluidized-bed reactor temperature is set as 80-100 DEG C, modified grammite, modification infusorial earth are suspended in by motion by air
Fluid among so that acicular wollastonite is interspersed in diatomaceous micropore, wollastonite single fiber-bundles, diatom are made by initiator
Styrene polymerization that native surface is impregnated with simultaneously connects, and forms the ca silicate fibre with fibrous flexible fiber ball network structure.
3. the special ca silicate fibre of a kind of stone paper according to claim 2, is characterized in that step（1）Described airflow milling choosing
With eddy airstream mill, flat airflow milling, high velocity air is changed into compressed air by nozzle, when material sends into powder by feeder
By the suspension shear action of high velocity air during broken room, make wollastonite that refinement solution beam is carried out under complete suspended state, obtain pin
Shape wollastonite in powder.
4. the special ca silicate fibre of a kind of stone paper according to claim 2, is characterized in that step（4）Described initiator choosing
With at least one of oxidation hydroxyl diisopropylbenzene (DIPB), tetren, initiator usage amount is wollastonite and kieselguhr gross mass
0.3-0.5%。
5. a kind of special ca silicate fibre of the stone paper according to any one of claim 1-4, is characterized in that being exclusively used in stone paper,
With in polyethylene, polrvinyl chloride, polypropylene, the polyethylene terephthalate of the mass ratio of 80-90% and 10-20% at least
It is a kind of to be machined by Screw Extrusion, so as to obtain stone paper using blowing, calendering or curtain coating.
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Effective date of registration: 20221207 Address after: 253000 Beiyuan Road, Pingyuan Economic Development Zone, Dezhou City, Shandong Province Patentee after: Dezhou Fangxing Fiber Co.,Ltd. Address before: 610091, Sichuan, Chengdu province Qingyang dragon industrial port, East Sea 4 Patentee before: CHENDU NEW KELI CHEMICAL SCIENCE Co.,Ltd. CHINA |