CN114941767B - Vacuum insulation panel and thermal insulation product - Google Patents
Vacuum insulation panel and thermal insulation product Download PDFInfo
- Publication number
- CN114941767B CN114941767B CN202210396152.2A CN202210396152A CN114941767B CN 114941767 B CN114941767 B CN 114941767B CN 202210396152 A CN202210396152 A CN 202210396152A CN 114941767 B CN114941767 B CN 114941767B
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- CN
- China
- Prior art keywords
- edge
- core material
- heat
- insulation panel
- vacuum insulation
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000009413 insulation Methods 0.000 title claims abstract description 32
- 239000011162 core material Substances 0.000 claims abstract description 39
- 238000007789 sealing Methods 0.000 claims abstract description 31
- 230000007704 transition Effects 0.000 claims description 5
- 230000004888 barrier function Effects 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000012774 insulation material Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/06—Arrangements using an air layer or vacuum
- F16L59/065—Arrangements using an air layer or vacuum using vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/029—Shape or form of insulating materials, with or without coverings integral with the insulating materials layered
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/08—Means for preventing radiation, e.g. with metal foil
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/06—Walls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2201/00—Insulation
- F25D2201/10—Insulation with respect to heat
- F25D2201/12—Insulation with respect to heat using an insulating packing material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/24—Structural elements or technologies for improving thermal insulation
- Y02A30/242—Slab shaped vacuum insulation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B80/00—Architectural or constructional elements improving the thermal performance of buildings
- Y02B80/10—Insulation, e.g. vacuum or aerogel insulation
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Thermal Insulation (AREA)
Abstract
The invention provides a vacuum insulation panel, comprising: an upper film, a lower film and a core material; the core material is provided with two opposite first edges and two opposite second edges; the upper film and the lower film are wrapped outside the core material, and a circle of heat sealing edges are formed outside the core material along the circumferential direction; wherein the first heat seal edge positioned outside the first edge of the core material and the second heat seal edge positioned outside the second edge of the core material are not in the same plane; the length of the lower film in the first edge extending direction is greater than the length of the upper film in the first edge extending direction, so that after the lower film and the upper film are heat sealed, the upper film forms at least one redundant portion on the first heat sealed edge.
Description
Technical Field
The invention relates to a heat insulation material, in particular to a vacuum heat insulation plate.
Background
The vacuum insulation panel (VIP panel) is one of vacuum heat insulation materials, is formed by compounding a filling core material and a vacuum protection surface layer, and effectively avoids heat transfer caused by air convection, so that the heat conductivity coefficient can be greatly reduced to 0.002-0.004w/m.k, which is 1/10 of that of the traditional heat insulation material.
The vacuum insulation consists of a core insulation material, a gas adsorbent, a desiccant and a barrier film. The heat insulation effect is achieved by vacuumizing the core material and the barrier film and reducing heat transfer of gas inside the heat insulation plate.
The existing manufacturing process of the vacuum insulation panel mainly comprises the steps of firstly manufacturing a barrier film into a bag with one side open, then placing a core material made of glass fibers into the bag, integrally placing the bag into a vacuum chamber for vacuumizing, and heating and sealing the edge after reaching the required vacuum degree.
Disadvantages of the prior art:
1. And (3) difficult vacuumizing: in order to obtain the vacuum insulation panel with smaller heat conductivity coefficient, the inside of the barrier film is vacuumized to a lower vacuum degree, and when the vacuum degree is pumped to a certain degree, gas is discharged from the bag randomly through the free movement of gas molecules (rather than flowing out through pressure difference), and the barrier film is only provided with a single-side opening, so that the vacuumizing flow is small, the required vacuum degree can be achieved only by a long time, the efficiency is influenced, and the vacuum degree is not well ensured. The folded edge damages the structure of the barrier film, which is easy to cause the leakage of the barrier film; the sealing edge is formed in the middle of the periphery of the vacuum insulation panel by vacuumizing and packaging the barrier film in the prior art, and the vacuum insulation panel is required to be attached to the surface of a refrigerator shell or other refrigeration equipment in the use process of the vacuum insulation panel, so that the sealing edge is required to be folded to the surface of the insulation panel to form a regular shape. The barrier film has certain hardness, and in the production process, irregular film shrinkage can be generated under the action of atmospheric pressure when the atmosphere is exposed, so that the barrier film can form a plurality of tiny air holes in the disordered folding process of the barrier film, external air can enter, and the service life of the vacuum insulation panel is greatly influenced. Even when a relatively large leak rate is formed, a large amount of gas can enter the heat insulation plate, so that the heat conductivity coefficient is greatly increased and the heat insulation plate is directly failed.
2. Edge banding is too long: because the core material made of glass fiber has higher fluffiness, in order to meet the bagging process, the bag must be made larger to put the core material into the bag, and the bag must form longer edge sealing after vacuumizing and compressing. Such a fabrication process also results in waste of barrier film material.
Disclosure of Invention
The invention aims to solve the main technical problem of providing a vacuum insulation panel with smaller thermal bridge effect.
The invention provides a vacuum insulation panel, comprising: an upper film, a lower film and a core material; the core material is provided with two opposite first edges and two opposite second edges;
The upper film and the lower film are wrapped outside the core material, and a circle of heat sealing edges are formed outside the core material along the circumferential direction; wherein the first heat seal edge positioned outside the first edge of the core material and the second heat seal edge positioned outside the second edge of the core material are not in the same plane;
The length of the lower film in the first edge extending direction is greater than the length of the upper film in the first edge extending direction, so that after the lower film and the upper film are heat sealed, the upper film forms at least one redundant portion on the first heat sealed edge.
In a preferred embodiment: two redundant parts are correspondingly formed on one first heat sealing edge, and the redundant parts are correspondingly arranged at the joint of the first edge and the second edge of the core material.
In a preferred embodiment: the redundant portion is folded outwardly along the length of the first side.
In a preferred embodiment: the redundant portion is folded inwardly along the length of the first side.
In a preferred embodiment: the redundant parts on the same heat sealing edge are turned in the same or different directions.
In a preferred embodiment: the redundant part folds on different heat-seal edges are reversely identical or different.
In a preferred embodiment: the second heat-sealing edge is located on the outer side of the upper surface of the core material, and the first heat-sealing edge is located on the outer side of the side surface of the core material.
In a preferred embodiment: the first heat sealing edge is connected with the second heat sealing edge through a transition heat sealing edge.
In a preferred embodiment: the transition heat sealing edge is an inclined plane.
The invention also provides a heat preservation product, and the vacuum heat insulation plate is applied.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. Is convenient for continuous automatic production, reduces manual handling and reduces adverse effects caused by human factors in the production process.
2. In the production process, when the product is exposed to the atmosphere, after the barrier film is contracted, the deformation is more regular, and hidden danger points such as sharp angles and the like which are easy to cause air leakage and damage of the barrier film are relatively difficult to appear.
3. When the upper film and the lower film are made of different materials, the longer film can be selected from aluminum-free films with smaller thermal bridges, and the shorter film is selected from aluminum films. Compared with the VIP with the traditional structure, the VIP can achieve the same effect of reducing the heat bridge of the yin-yang film. And the proportion of aluminum films on the side wall of the VIP plate is reduced, so that the thermal bridge effect can be further reduced.
4. In the occasion that uses after the hem to the VIP, the product production process of this structure is exposed the atmosphere after, and shrink under the atmospheric pressure effect, shrinkage deformation is comparatively regular, can simplify the hem process, is favorable to automaticly implementing to after the hem, less to the barrier film damage, be favorable to prolonging the life of VIP.
Drawings
FIG. 1 is a perspective view of a preferred embodiment 1 of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is a perspective view of a preferred embodiment 2 of the present invention;
fig. 4 is a partial enlarged view of fig. 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, and that all other embodiments obtained by persons of ordinary skill in the art without making creative efforts based on the embodiments in the present invention are within the protection scope of the present invention.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," configured to, "" engaged with, "" connected to, "and the like are to be construed broadly, and may be, for example," connected to, "wall-mounted," connected to, removably connected to, or integrally connected to, mechanically connected to, electrically connected to, directly connected to, or indirectly connected to, through an intermediary, and may be in communication with each other between two elements, as will be apparent to those of ordinary skill in the art, in view of the detailed description of the terms herein.
Example 1
Referring to fig. 1-2, the present invention provides a vacuum insulation panel comprising: an upper film, a lower film 1 and a core material; the core material is provided with two opposite first edges and two opposite second edges;
The upper film and the lower film 1 are wrapped outside the core material, and a circle of heat sealing edges are formed outside the core material along the circumferential direction; wherein the first heat sealing edge 2 positioned outside the first edge of the core material and the second heat sealing edge 3 positioned outside the second edge of the core material are not in the same plane; and the first heat sealing edge 2 and the second heat sealing edge 3 are connected through a transition heat sealing edge 4 which is an inclined surface. So that the second heat seal 3 is located outside the upper surface of the core material and the first heat seal 2 is located outside the side of the core material.
The length of the lower film 1 in the first edge extension direction is greater than the length of the upper film in the first edge extension direction, so that after heat sealing the lower film 1 and the upper film, the upper film forms at least one redundant portion 5 on the first heat seal edge 2.
In this embodiment, two redundant portions 5 are formed on the first heat seal edge 2, and the redundant portions 5 are located at the connection position between the first edge and the second edge of the core material. And, the redundant part 5 is turned outwards along the length direction of the first side.
Example 2
Referring to fig. 3 to 4, this embodiment differs from embodiment 1 in that: the redundant portion 5 is folded inwardly along the length of the first side.
The folding direction of each redundant part 5 in embodiment 1 and embodiment 2 is the same, and as a simple alternative, the folding direction of the redundant parts 5 on the same heat seal edge may be different. Or the redundant portions 5 on different heat seal edges may be turned in opposite directions.
The foregoing is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any person skilled in the art will be able to make insubstantial modifications of the present invention within the scope of the present invention disclosed herein by this concept, which falls within the actions of invading the protection scope of the present invention.
Claims (8)
1. A vacuum insulation panel characterized by comprising: an upper film, a lower film and a core material; the core material is provided with two opposite first edges and two opposite second edges; the upper film and the lower film are wrapped outside the core material, and a circle of heat sealing edges are formed outside the core material along the circumferential direction; wherein the first heat seal edge positioned outside the first edge of the core material and the second heat seal edge positioned outside the second edge of the core material are not in the same plane; the length of the lower film in the extending direction of the first edge is larger than that of the upper film in the extending direction of the first edge, so that after the lower film and the upper film are heat-sealed, the upper film forms at least one redundant part on the first heat-sealed edge, and the redundant part is outwards folded along the length direction of the first edge or inwards folded along the length direction of the first edge.
2. A vacuum insulation panel according to claim 1, wherein: two redundant parts are correspondingly formed on one first heat sealing edge, and the redundant parts are correspondingly arranged at the joint of the first edge and the second edge of the core material.
3. A vacuum insulation panel according to claim 1, wherein: the redundant parts on the same heat sealing edge are turned in the same or different directions.
4. A vacuum insulation panel according to claim 1, wherein: the redundant parts on different heat sealing edges are turned in the same or different directions.
5. A vacuum insulation panel according to claim 1, wherein: the second heat-sealing edge is located on the outer side of the upper surface of the core material, and the first heat-sealing edge is located on the outer side of the side surface of the core material.
6. A vacuum insulation panel according to claim 1, wherein: the first heat sealing edge is connected with the second heat sealing edge through a transition heat sealing edge.
7. A vacuum insulation panel according to claim 6, wherein: the transition heat sealing edge is an inclined plane.
8. A thermal insulation product characterized in that a vacuum insulation panel according to any one of claims 1 to 7 is applied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210396152.2A CN114941767B (en) | 2022-04-15 | 2022-04-15 | Vacuum insulation panel and thermal insulation product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210396152.2A CN114941767B (en) | 2022-04-15 | 2022-04-15 | Vacuum insulation panel and thermal insulation product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114941767A CN114941767A (en) | 2022-08-26 |
| CN114941767B true CN114941767B (en) | 2024-05-10 |
Family
ID=82907490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210396152.2A Active CN114941767B (en) | 2022-04-15 | 2022-04-15 | Vacuum insulation panel and thermal insulation product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114941767B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005172120A (en) * | 2003-12-10 | 2005-06-30 | Sanyo Electric Co Ltd | Vacuum heat insulating panel |
| JP2007155135A (en) * | 2005-04-27 | 2007-06-21 | Nisshinbo Ind Inc | Vacuum insulation material and manufacturing method thereof |
| DE202007008842U1 (en) * | 2007-06-18 | 2007-09-20 | The Vac Company Gmbh | Thermal insulation panel |
| CN101963267A (en) * | 2010-10-09 | 2011-02-02 | 上海海事大学 | Air insulating structure of vacuum insulation panel and packaging method thereof |
| CN202708481U (en) * | 2012-08-15 | 2013-01-30 | 苏州宏久航空防热材料科技有限公司 | Arc package bag for arc vacuum heat-insulating board core material |
| CN203641772U (en) * | 2013-12-27 | 2014-06-11 | 常州山由帝武节能新材料制造有限公司 | Roll-type vacuum insulated panel |
| CN215862359U (en) * | 2021-05-19 | 2022-02-18 | 四川零零昊科技有限公司 | Vacuum insulation panel edge sealing structure and vacuum insulation panel |
| CN217977987U (en) * | 2022-04-15 | 2022-12-06 | 福建赛特新材股份有限公司 | Vacuum insulation panel and insulation product |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2508879B (en) * | 2012-12-13 | 2014-12-03 | Univ Oxford Brookes | A thermal insulation panel |
-
2022
- 2022-04-15 CN CN202210396152.2A patent/CN114941767B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005172120A (en) * | 2003-12-10 | 2005-06-30 | Sanyo Electric Co Ltd | Vacuum heat insulating panel |
| JP2007155135A (en) * | 2005-04-27 | 2007-06-21 | Nisshinbo Ind Inc | Vacuum insulation material and manufacturing method thereof |
| DE202007008842U1 (en) * | 2007-06-18 | 2007-09-20 | The Vac Company Gmbh | Thermal insulation panel |
| CN101963267A (en) * | 2010-10-09 | 2011-02-02 | 上海海事大学 | Air insulating structure of vacuum insulation panel and packaging method thereof |
| CN202708481U (en) * | 2012-08-15 | 2013-01-30 | 苏州宏久航空防热材料科技有限公司 | Arc package bag for arc vacuum heat-insulating board core material |
| CN203641772U (en) * | 2013-12-27 | 2014-06-11 | 常州山由帝武节能新材料制造有限公司 | Roll-type vacuum insulated panel |
| CN215862359U (en) * | 2021-05-19 | 2022-02-18 | 四川零零昊科技有限公司 | Vacuum insulation panel edge sealing structure and vacuum insulation panel |
| CN217977987U (en) * | 2022-04-15 | 2022-12-06 | 福建赛特新材股份有限公司 | Vacuum insulation panel and insulation product |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114941767A (en) | 2022-08-26 |
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Effective date of registration: 20240408 Address after: 231241 Northwest corner of the intersection of Duxiuyuan Road and Jiangjunling Road in Huagang Town, Feixi County, Hefei City, Anhui Province, China Applicant after: Anhui Saite New Materials Co.,Ltd. Country or region after: China Address before: 364000 No. 5 Industrial Road 2, Liancheng County Industrial Park, Longyan City, Fujian Province Applicant before: FUJIAN SUPERTECH ADVANCED MATERIAL Co.,Ltd. Country or region before: China |
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