CN109320210B - Ceramic filter and preparation method thereof - Google Patents

Ceramic filter and preparation method thereof Download PDF

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Publication number
CN109320210B
CN109320210B CN201811510112.6A CN201811510112A CN109320210B CN 109320210 B CN109320210 B CN 109320210B CN 201811510112 A CN201811510112 A CN 201811510112A CN 109320210 B CN109320210 B CN 109320210B
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Prior art keywords
cup
holes
cup bottom
hole
ceramic filter
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CN201811510112.6A
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Chinese (zh)
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CN109320210A (en
Inventor
杨少明
请求不公布姓名
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Quanzhou Kaijia New Material Research Institute Co ltd
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Quanzhou Kaijia New Material Research Institute Co ltd
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/0051—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof characterised by the pore size, pore shape or kind of porosity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/003—Apparatus or processes for treating or working the shaped or preshaped articles the shaping of preshaped articles, e.g. by bending
    • B28B11/006—Making hollow articles or partly closed articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/04—Clay; Kaolin
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/13—Compounding ingredients
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/13—Compounding ingredients
    • C04B33/16—Lean materials, e.g. grog, quartz
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/36—Reinforced clay-wares
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/0003—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof containing continuous channels, e.g. of the "dead-end" type or obtained by pushing bars in the green ceramic product

Abstract

The invention discloses a ceramic filter and a preparation method thereof, the filter comprises a cup body and a cup bottom, the cup bottom is formed with a plurality of through holes, and the through holes comprise at least four branch channels with one ends intersecting and communicated. The preparation method comprises the steps of firstly forming a cup body once, then forming a cup bottom with a through hole die twice, then sintering until the through hole die is not formed, forming a through hole in the cup bottom, or forming the cup body and the cup bottom once, wherein the cup bottom is provided with a die for forming the through hole, then sintering until the through hole die is not formed, and forming the through hole in the cup bottom. The bottom surface of the filter is provided with a plurality of branch-shaped through holes, and the aperture is 0.1-0.8mm, so that the area of the through holes can be increased at the bottom of a limited filter, and the filtering speed and the filtering efficiency can be improved. The preparation method is simple, can effectively form the through hole in the cup bottom, does not influence the appearance and the material performance of the filter, and has no residue of fibrous materials, safety and no toxicity.

Description

Ceramic filter and preparation method thereof
[ field of technology ]
The invention relates to a ceramic filter and a preparation method thereof, in particular to a tea residue ceramic filter and a preparation method thereof, and belongs to the technical field of tea set manufacturing.
[ background Art ]
The filtering parts of the tea dreg filter of kungfu tea are generally of two types, namely a stainless steel net and a plastic net, and the stainless steel and the plastic have the risk of dissolving out harmful substances. Ceramic materials are also used in many applications, such as water filtration cartridges, and automotive exhaust filtration honeycomb ceramics. However, the ceramic materials have large filtration resistance and only slight penetration, if pore formers such as carbon powder or foam microspheres are added into the materials, the porous ceramic body with high porosity can be prepared with the porosity of more than 50%, but the through pores are less, so that the tea water is filtered and is only slowly dripped, the speed of the net-shaped materials is not reached, and the filtration area, the pressurization or the reserved channels are required to be enlarged. The ceramic material is directly provided with a plurality of circular through holes, but the diameter is often too large, and the filtering effect is poor; and the operation is troublesome, and the breakage rate is high.
These cases are therefore not ideal for use in kungfu tea.
[ invention ]
The invention aims to overcome the defects of the prior art and provide the ceramic filter with small filtering area, high filtering speed under normal pressure and good filtering effect.
Another object of the present invention is to provide a method for preparing the ceramic filter.
The invention is realized by the following technical scheme:
a ceramic filter, characterized in that: comprises a cup body and a cup bottom, wherein a plurality of through holes are formed in the cup bottom. The through holes are irregularly distributed in the cup bottom.
The through hole in the invention comprises at least four branch channels with one ends intersecting and communicated. Preferably, the angle between two adjacent branch channels is an obtuse angle. In the through hole of the invention, at most two branch channels are in the same plane.
The aperture of the through hole in the present invention is 0.1-0.8mm. Preferably, the aperture of the through hole is 0.1-0.5mm; preferably, the aperture of the through hole is 0.3-0.8mm; preferably, the aperture of the through hole is 0.5-0.8mm; preferably, the aperture of the through hole is 0.3-0.6mm.
The preparation method of the ceramic filter is characterized by comprising the following steps:
a. injecting the green body slurry into a mold to form a cup body at one time, and after the green body slurry is dried, forming a cup bottom by using the mixed slurry mixed with at least four needles of multi-needle fiber materials;
b. demoulding after the blank body is slightly dried, and scrubbing the bottom of the cup to enable the end part of the multi-needle fiber material to be exposed out of the blank body;
c. and (3) sintering at 1000-1200 ℃ after the green body is dried until the multi-needle fiber material in the cup bottom is completely sintered, and forming a through hole in the cup bottom.
The mold in the present invention is preferably a plaster mold.
In the invention, one ends of a plurality of needles of the multi-needle fiber material are intersected, the needles of the multi-needle fiber material are connected to one point, and at least two needles of the multi-needle fiber material are respectively exposed out of two sides of the cup bottom, so that a through hole is formed after sintering.
The multi-needle fiber material is preferably multi-needle fiber foam plastic with at least four-needle fiber structure, and the multi-needle fiber foam plastic and the cup bottom blank are firstly mixed into mixed slurry during secondary molding, and then the mixed slurry is injected into a mold for secondary molding of the cup bottom. When the multi-needle fiber foam is at least four-needle fiber, the through holes penetrate the two surfaces of the cup bottom in a non-linear manner.
The multi-needle fibrous material accounts for 2-15% of the volume of the cup bottom blank.
When the three-dimensional reticular foam plastic or the three-dimensional reticular sponge is adopted to replace the multi-needle fiber material, the preparation method of the ceramic filter comprises the following steps:
a. bonding the three-dimensional net-shaped fiber material with blank slurry at the bottom of a die, injecting the blank slurry into the die to form a cup body and a cup bottom at one time, and controlling the thickness of the cup bottom not to exceed the height of the three-dimensional net-shaped material;
b. and (3) sintering at 1000-1200 ℃ after the green body is dried until the three-dimensional reticular fiber material in the cup bottom is completely sintered, and forming a through hole in the cup bottom.
The thickness of the cup bottom is controlled not to exceed the height of the three-dimensional net-shaped material, so as to ensure that the through holes are formed by sintering.
In the invention, the moisture of the green body after the green body is demoulded is 20-35%.
Compared with the prior art, the invention has the following advantages:
the bottom surface of the filter is provided with a plurality of branch-shaped through holes, and the aperture is 0.1-0.8mm, so that the area of the through holes can be increased at the bottom of a limited filter, and the filtering speed and the filtering efficiency can be improved.
The preparation method is simple, can effectively form the through hole in the cup bottom, does not influence the appearance and the material performance of the filter, and has no residue of fibrous materials, safety and no toxicity.
[ description of the drawings ]
FIG. 1 is a schematic view of an axial cross-sectional structure of the present invention;
FIG. 2 is a block diagram of one embodiment of a multi-needle fibrous material of the present invention;
fig. 3 is a schematic axial sectional structure of another embodiment of the present invention.
[ detailed description ] of the invention
The invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, a ceramic filter comprises a cup body 1 and a cup bottom 2, wherein the cup bottom 2 is formed with a plurality of through holes 3, and each through hole 3 penetrates through two surfaces of the cup bottom 2 in a non-linear manner. The through holes 3 are irregularly distributed in the cup bottom 2.
Each through hole 3 includes at least four branch passages 31 whose one ends intersect and are open.
Preferably, the included angle between two adjacent branch passages 31 of the through hole 3 is an obtuse angle; it is preferable that at most two branch passages 31 of the through-hole 3 are in the same plane, i.e., three branch passages 31 are not in the same plane, so that the entire through-hole 3 is in a solid needle shape.
Preferably, the aperture of the through-hole 3 is 0.1-0.8mm. The three-dimensional total height of the mold forming the through hole 3 is not smaller than the thickness of the cup bottom 2, so that each mold can form the through hole 3 in the cup bottom.
Preferably, the through hole 3 includes four branch channels 31 with one end intersecting and communicating, the four branch channels 31 are four needles which are distributed at one point in equal length, two adjacent two branch channels 31 are obtuse angles, and any three branch channels 31 are not in the same plane.
The preparation method of the ceramic filter comprises the following steps:
a. injecting the green body slurry into a mold to form a cup body at one time, and after the green body slurry is dried, forming a cup bottom by using a mixed blank mixed with at least four needles of multi-needle fiber materials;
b. demoulding after the blank body is slightly dried, and scrubbing the bottom of the cup to enable the end part of the multi-needle fiber material to be exposed out of the blank body;
c. and (3) sintering at 1000-1200 ℃ after the green body is dried until the multi-needle fiber material in the cup bottom is completely sintered, and forming a through hole in the cup bottom.
The glaze firing can also be further carried out.
The multi-needle fiber material adopts multi-needle fiber foam plastic.
When the filter is prepared from the multi-needle fiber material, the multi-needle fiber material can be mixed into green body slurry, the slurry is injected into a die to form the cup body 1 and the cup bottom 2 at one time, the green body is demolded after being slightly dried, the cup bottom 2 is scrubbed to enable the end part of the multi-needle fiber material to be exposed out of the green body, and the dried green body is sintered until the multi-needle fiber material in the cup body 1 and the cup bottom 2 is completely burned to be free, and through holes are formed in the cup bottom.
The scrubbing blank cup bottom 2 is preferably scrubbed with a wet sponge.
Preferably, the multi-needle fiber foam has at least four needles in a three-dimensional shape, as shown in fig. 2, so that at least two of the needles can protrude from two sides of the cup bottom, and the needles are sintered to form the through holes 3.
Further, when the cup body and the cup bottom are formed in the step a, the cup body and the cup bottom of the mold can be separated, the cup body 1 and the cup bottom 2 can be formed firstly, after the cup bottom 2 is slightly dried, the cup body 1 is separated from the cup bottom, then the mold is closed again, and the cup bottom 2 mixed with the multi-needle fiber material is formed again. Of course, other methods may be used for preparing the porous fibrous material or the three-dimensional net-like fibrous material so as to protrude from the cup bottom 2, and the porous 3 is formed after sintering.
The multi-needle fiber material can also be replaced by a three-dimensional net fiber material such as three-dimensional net foam plastic or three-dimensional net sponge, and the preparation method comprises the following steps: the three-dimensional reticular fiber material is adhered to the bottom of the mould by using green body slurry, then the green body slurry is injected into the mould to form the cup body and the cup bottom at one time, the thickness of the cup bottom is controlled to be not more than the height of the three-dimensional reticular fiber material, the three-dimensional reticular fiber material is sintered at 1000-1200 ℃ after the green body is dried until the three-dimensional reticular fiber material in the cup bottom is completely sintered, and through holes are formed in the cup bottom, as shown in figure 3.
The three-dimensional height of the selected multi-needle fiber material or three-dimensional net fiber material is larger than the thickness of the designed cup bottom.
The present invention will be described in further detail with reference to specific examples.
Example 1:
mixing clay, feldspar and quartz with water to obtain blank slurry, adding part of the blank slurry into a mixed blank of tetrapod-like fiber foam plastics with volume ratio of 2.5%, wherein the diameter of single needle of the tetrapod-like fiber foam plastics is 0.5mm, and the length is 2.5mm.
Injecting the green body slurry into a mold to form a cup body 1 at one time, and after the green body slurry is dried, forming a cup bottom 2 by using a mixed blank mixed with four-needle multi-needle fiber foamed plastic; demoulding after the blank is slightly dried, and washing the cup bottom with wet sponge to expose the end of the multi-needle fiber material outside the blank; after the green body is dried, the green body is subjected to biscuit firing at 1050 ℃ for more than 1 hour, the wax removal time is longer than that of normal biscuit firing, the multi-needle fiber foam plastic in the cup bottom is completely fired until no multi-needle fiber foam plastic is fired, good through holes 3 are formed in the cup bottom, the periphery of the biscuit firing green body is glazed, the bottom is not glazed, and the glazing firing at 1100 ℃ is completed.
Example 2:
preparing blank slurry from purple clay, bonding a small amount of slurry to the bottom of a gypsum mold for one-step molding of a cup body 1 and a cup bottom 2, controlling the thickness not to exceed the height of the three-dimensional mesh material, demolding after the blank is slightly dried, repairing the blank, and washing the cup bottom with wet sponge to expose the end part of the three-dimensional mesh material outside the blank; and (3) after the green body is dried, sintering, wherein the sintering temperature is 1120 ℃, the wax removal time is 50min more than that of normal biscuit firing, the three-dimensional reticular foam plastic in the cup bottom is burnt, the wax is removed for 50min at 750 ℃, and good through holes 3 are formed in the cup bottom 2, so that the dry purple sand ceramic filter is obtained.
Example 3:
injecting the green body slurry into a mold to form a cup body 1 at one time, and after the green body slurry is dried, forming a cup bottom 2 by using a mixed blank mixed with four-needle multi-needle fiber foamed plastic; demoulding after the blank is slightly dried, and washing the cup bottom with wet sponge to expose the end of the multi-needle fiber material outside the blank; and (3) after the green body is dried, sintering at 1000 ℃ until the multi-needle fiber foam plastic in the cup bottom is completely sintered, and forming good through holes 3 in the cup bottom.
Example 4:
the three-dimensional reticular foam sponge is adhered to the bottom of a mould by a little green body slurry, the green body slurry is injected into the mould to form the cup body 1 and the cup bottom 2 at one time, the thickness of the cup bottom 2 is controlled not to exceed the height of the three-dimensional reticular material, the mould is removed after the green body is slightly dried, the green body is dried, and the three-dimensional reticular foam sponge is sintered at 1200 ℃ until the three-dimensional reticular foam sponge in the cup bottom is completely or completely sintered, and good through holes 3 are formed in the cup bottom 2.
The through holes 3 formed after the sintering of the three-dimensional reticular fiber material are linear and nonlinear, and belong to irregular through holes.
The filter cup bottom 2 prepared by the invention has no obvious macropores seen by naked eyes, but is provided with a plurality of branch-shaped through holes 3, when the tea is brewed, tea water can be filtered out quickly, tea residues are not filtered out at the same time, the filtering speed is high, and the filtering effect is good. The invention burns the fiber material until no fiber material exists, is safe and nontoxic, and is energy-saving and environment-friendly after low-temperature burning.

Claims (4)

1. A ceramic filter, characterized in that: including cup (1) and bottom of cup (2), bottom of cup (2) shaping have a plurality of aperture be 0.1-0.8mm through-holes (3), a plurality of through-holes (3) irregularly distribute in bottom of cup (2), through-holes (3) include that four at least one ends intersect and lead to branch channel (31), the contained angle of two adjacent branch channels (31) is the obtuse angle, through-holes (3) at most two branch channels (31) be in the coplanar, bottom of cup (2) can't see obvious macropore, ceramic filter's preparation method includes the following steps:
a. injecting the green body slurry into a mold to form a cup body at one time, and after the green body slurry is dried, forming a cup bottom by using the mixed slurry mixed with at least four needles of multi-needle fiber materials;
b. demoulding after the blank body is slightly dried, and scrubbing the bottom of the cup to enable the end part of the multi-needle fiber material to be exposed out of the blank body;
c. and (3) sintering at 1000-1200 ℃ after the green body is dried until the multi-needle fiber material in the cup bottom is completely sintered, and forming a through hole in the cup bottom.
2. A ceramic filter according to claim 1, wherein a plurality of needles of said multi-needle fibrous material intersect at one end, at least two needles of said multi-needle fibrous material being exposed on either side of the cup bottom.
3. A ceramic filter, characterized in that: including cup (1) and bottom of cup (2), bottom of cup (2) shaping have a plurality of aperture be 0.1-0.8mm through-holes (3), a plurality of through-holes (3) irregularly distribute in bottom of cup (2), through-holes (3) include that four at least one ends intersect and lead to branch channel (31), the contained angle of two adjacent branch channels (31) is the obtuse angle, through-holes (3) at most two branch channels (31) be in the coplanar, bottom of cup (2) can't see obvious macropore, ceramic filter's preparation method includes the following steps:
a. bonding the three-dimensional net-shaped fiber material with blank slurry at the bottom of a die, injecting the blank slurry into the die to form a cup body and a cup bottom at one time, and controlling the thickness of the cup bottom not to exceed the height of the three-dimensional net-shaped material;
b. and (3) sintering at 1000-1200 ℃ after the green body is dried until the three-dimensional reticular fiber material in the cup bottom is completely sintered, and forming a through hole in the cup bottom.
4. A ceramic filter according to claim 3, wherein said three-dimensional network fibrous material is a three-dimensional network foam or a three-dimensional network sponge.
CN201811510112.6A 2018-12-11 2018-12-11 Ceramic filter and preparation method thereof Active CN109320210B (en)

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Application Number Priority Date Filing Date Title
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CN109320210B true CN109320210B (en) 2023-11-03

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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1147210A (en) * 1994-12-27 1997-04-09 有限会社米卡子基文化会馆 Porous ceramic filter, method of mfg. same, extrusion molding die for mfg. same, and extrusion molding machine using same
JPH09117372A (en) * 1995-10-26 1997-05-06 Zojirushi Corp Beverage extractor
CN101057746A (en) * 2007-04-10 2007-10-24 郜天宇 Easy cleaned grinding and cooking integral soya-bean milk machine
CN101182182A (en) * 2007-11-15 2008-05-21 景德镇市瑞祥创新陶瓷有限公司 Interlayer thermal insulation ceramic vessel and method for manufacturing same
CN101224976A (en) * 2008-01-25 2008-07-23 严成芳 Integral permanent magnetic beverage appliance and method for manufacturing same
CN201088471Y (en) * 2007-04-10 2008-07-23 郜天宇 Easy cleaning grinding and boiling combined soymilk machine
CN203314750U (en) * 2013-03-26 2013-12-04 品胜实业股份有限公司 Filter cup for food material brewing
JP3189704U (en) * 2014-01-14 2014-03-27 新力康國際有限公司 Cooking machine cup holder structure
CN104068748A (en) * 2013-03-26 2014-10-01 品胜实业股份有限公司 Filter cup for brewing food materials
CN204743780U (en) * 2015-06-30 2015-11-11 苏州顺和丰家电科技有限公司 Filter bowl is crossed towards formula bar hole to hand
CN107114975A (en) * 2017-05-10 2017-09-01 浙江天使之泪珍珠股份有限公司 A kind of pearl ceramic cup and its production technology

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1147210A (en) * 1994-12-27 1997-04-09 有限会社米卡子基文化会馆 Porous ceramic filter, method of mfg. same, extrusion molding die for mfg. same, and extrusion molding machine using same
JPH09117372A (en) * 1995-10-26 1997-05-06 Zojirushi Corp Beverage extractor
CN101057746A (en) * 2007-04-10 2007-10-24 郜天宇 Easy cleaned grinding and cooking integral soya-bean milk machine
CN201088471Y (en) * 2007-04-10 2008-07-23 郜天宇 Easy cleaning grinding and boiling combined soymilk machine
CN101182182A (en) * 2007-11-15 2008-05-21 景德镇市瑞祥创新陶瓷有限公司 Interlayer thermal insulation ceramic vessel and method for manufacturing same
CN101224976A (en) * 2008-01-25 2008-07-23 严成芳 Integral permanent magnetic beverage appliance and method for manufacturing same
CN203314750U (en) * 2013-03-26 2013-12-04 品胜实业股份有限公司 Filter cup for food material brewing
CN104068748A (en) * 2013-03-26 2014-10-01 品胜实业股份有限公司 Filter cup for brewing food materials
JP3189704U (en) * 2014-01-14 2014-03-27 新力康國際有限公司 Cooking machine cup holder structure
CN204743780U (en) * 2015-06-30 2015-11-11 苏州顺和丰家电科技有限公司 Filter bowl is crossed towards formula bar hole to hand
CN107114975A (en) * 2017-05-10 2017-09-01 浙江天使之泪珍珠股份有限公司 A kind of pearl ceramic cup and its production technology

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