CN110625739A - Preparation method of extrusion type concrete partition board with two sides provided with grid cloth - Google Patents
Preparation method of extrusion type concrete partition board with two sides provided with grid cloth Download PDFInfo
- Publication number
- CN110625739A CN110625739A CN201910928150.1A CN201910928150A CN110625739A CN 110625739 A CN110625739 A CN 110625739A CN 201910928150 A CN201910928150 A CN 201910928150A CN 110625739 A CN110625739 A CN 110625739A
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- Prior art keywords
- grid cloth
- partition board
- concrete partition
- concrete
- sides
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- 239000004567 concrete Substances 0.000 title claims abstract description 121
- 239000004744 fabric Substances 0.000 title claims abstract description 97
- 238000005192 partition Methods 0.000 title claims abstract description 91
- 238000001125 extrusion Methods 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 26
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000002002 slurry Substances 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 13
- 238000005096 rolling process Methods 0.000 claims description 11
- 239000000835 fiber Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 2
- 238000005452 bending Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000002860 competitive effect Effects 0.000 abstract description 2
- 239000003513 alkali Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000004574 high-performance concrete Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000012783 reinforcing fiber Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000010878 waste rock Substances 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
Classifications
-
- 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
- B28B11/14—Apparatus or processes for treating or working the shaped or preshaped articles for dividing shaped articles by cutting
- B28B11/16—Apparatus or processes for treating or working the shaped or preshaped articles for dividing shaped articles by cutting for extrusion or for materials supplied in long webs
-
- 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
-
- 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
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
- E04C2/06—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres reinforced
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
Abstract
A method for preparing an extrusion type concrete partition board with two sides added with grid cloth belongs to the technical field of constructional engineering, and is characterized in that the production process of the conventional extrusion type concrete partition board is improved, two sets of concrete partition board and grid cloth devices are added, and each device is positioned at the top and the bottom of extrusion type concrete partition board production equipment and respectively adds grid cloth on the upper surface and the lower surface of the concrete partition board with two sides added with grid cloth; after the concrete slab blank extruded by the extruder is formed, the upper surface and the lower surface of the concrete slab blank are clung to the adjacent roller groups along with the advancing of the concrete slab blank, and the grid cloth is clung to the concrete slab blank and advances synchronously with the concrete slab blank; and cutting the concrete partition board with the grid cloth on the two sides by a high-speed cutting machine, and curing the concrete to reach the designed strength to complete the preparation of the concrete partition board with the grid cloth on the two sides. The invention can produce the concrete partition board with the two surfaces added with the grid cloth and excellent bending resistance with high efficiency and low cost, and has strong market competitive advantage.
Description
Technical Field
The invention belongs to the technical field of building engineering, relates to industrial production of a concrete partition board, and particularly relates to a preparation method of an extrusion type concrete partition board with double sides and grid cloth.
Background
The production method of the extrusion method concrete slab, in particular to the lightweight concrete partition board, including the concrete hollow slab and the lightweight aggregate concrete slab, is accepted by the market due to the advantages of neat appearance, high production efficiency and low manufacturing cost. However, the concrete plate produced by the current continuous extrusion method is easy to break and seriously worn in the processes of production, transportation and installation because of no anti-bending tensile material, thereby seriously restricting the popularization and application of the technology for producing the concrete partition board by the extrusion method.
The extrusion method for producing concrete slabs adopts a screw extrusion production mode due to a continuous extrusion production mode, and the mixture is extruded from a die according to a certain shape, so that the bending-resistant material of the slabs is difficult to accurately add to the slabs according to a preset position due to stirring winding and uncertain extrusion action in all directions. Of course, the solution can also be achieved by adding reinforcing fiber material to the material, but this method requires too much reinforcing fiber material, which significantly increases the production cost, and thus is not accepted in the market.
The invention patent granted Specification CN201110283210.2 discloses a high-performance concrete extrusion partition board, which is prepared from the following components in parts by weight: 200-300 parts of cement; 200-350 parts of fly ash; 400-600 parts of waste rock powder; 3-5 parts of polypropylene fiber; 30-50 parts of plant fiber; 60-80 parts of an inorganic water-retaining agent; 2-3 parts of a rare earth catalyst; 150-200 parts of tap water; also discloses a preparation method of the high-performance concrete extruded partition board, which comprises the following steps: preparing raw materials, mixing and stirring the raw materials, extruding the raw materials by a high-pressure vacuum extruder, performing autoclaved curing and shaping high-pressure curing; the invention has the characteristics of energy saving, no pollution, high compressive strength, good water resistance, aging resistance, low expansion rate, distortion and deformation prevention, water resistance, fire resistance and sound insulation, and can eliminate the yellowing and falling-off phenomena of the partition board. However, the concrete extruded partition board of the invention has lower bending strength, and the production cost is higher due to excessive addition of fiber materials.
The utility model discloses a patent granted instruction CN201721308145.3 of utility model, which discloses a continuous transmission output type extrusion molding device for a concrete round hole plate, belonging to the technical field of constructional engineering, the structure of the extrusion molding device comprises a crawler frame and a frame, the frame is provided with an upper horizontal plane, a bottom die of the concrete round hole plate is fixedly arranged on the upper horizontal plane, and parallel hole die rotating shafts are arranged on the same horizontal plane at equal intervals; a spiral winch is fixedly arranged on the shaft body of the upstream section of the hole die rotating shaft, and the spiral winch section forms a concrete circular hole plate spiral extrusion molding section; a concrete feeding hopper is arranged above a hole die rotating shaft of the spiral winch section, a vibrator is arranged above a bottom die of a concrete circular hole plate in the downstream direction of the concrete feeding hopper, and a horizontal swinging trowelling device is arranged above the bottom die of the concrete circular hole plate in the downstream direction of the vibrator; the downstream port department of concrete round hole board die block has accepted the conveying track. The continuous concrete round hole plate is obtained, the processing efficiency of plate manufacturing is effectively improved, and the building prefabricated part is effectively manufactured. But the utility model does not solve the problem of adding ribs to the prepared concrete round hole plate.
Utility model patent grant specification CN201620239663.3 discloses a prefabricated alkali-resistant net cloth light partition wall board of taking, include: the plate body is formed by pouring light poured granular concrete, the front side face and the rear side face of the plate body are respectively provided with an alkali-resistant mesh cloth, and the size of the alkali-resistant mesh cloth which is 1-2 mm higher than the plate body is provided; the left side and the right side of the plate body are recessed by 5mm compared with the plate surface so as to seal the joint, and the left side and the right side of the plate body are respectively provided with a plate ridge and a plate groove which are matched in shape. The utility model discloses an effectively solve the heat preservation of building, thermal-insulated, sound insulation, fire prevention scheduling problem, improve the proportion of industrialization and mechanization in the building manufacturing process, realize that the construction is simple, save the manual work, reduce the energy consumption, reduce cost, reduction of erection time improves comprehensive benefits such as heat preservation, fire prevention, sound insulation, environmental protection, matter are excellent. However, the utility model does not relate to the problem of the manufacturing method.
Aiming at the problem that no anti-bending material is added in the existing extrusion type concrete partition board, a new technical scheme is necessary to be provided.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a preparation method of an extrusion type concrete partition board with double sides and grid cloth, which improves the existing conventional production process of an extrusion type concrete slab, and adds a device for adding the grid cloth on the double sides of the concrete partition board, so that the concrete partition board produced by the invention has the advantages of good bending resistance, neat appearance, high production efficiency and low manufacturing cost.
A preparation method of an extrusion type concrete partition board with two sides added with grid cloth is characterized by comprising the following steps: comprises the following steps which are sequentially carried out,
step one, adding a grid cloth device to an extrusion type concrete slab production line
The method comprises the following steps that two sets of concrete partition plate and grid cloth devices are additionally arranged at the discharge end of an extrusion type concrete slab production line, the two sets of concrete partition plate and grid cloth devices are respectively positioned at the bottom and the top of the discharge end of concrete partition plate production equipment, each concrete partition plate and grid cloth device comprises a grid cloth rolling frame, a cementing slurry groove and a roller set, and the grid cloth rolling frame is used for placing grid cloth; the cementing slurry groove is used for containing cementing slurry; the roller group comprises more than one cylindrical roller which is respectively arranged at the upper part of the cementing slurry tank, and the discharge end of the concrete partition board blank corresponds to the upper side and the lower side of the concrete partition board blank, wherein the roller group at the lower side can be sleeved with a conveying belt in a segmented manner;
step two, preparation of adding grid cloth on two sides of concrete partition board
Installing a grid cloth rolling frame provided with grid cloth on a station, pulling out the grid cloth in the grid cloth rolling frame, and continuously winding the grid cloth on a roller wheel to enable the grid cloth to pass through the lower part of the roller wheel in a cementing slurry tank until the grid cloth reaches the end part of the roller wheel group adjacent to the concrete partition board with the grid cloth on both sides, wherein the grid cloth is a cloth-shaped fabric with the tensile strength of more than 50MPa fibers; injecting cementing slurry into the cementing slurry tank, wherein the cementing slurry is a mixture of an inorganic or organic cementing material and water;
step three, preparing the concrete partition board with the grid cloth on the two sides
Feeding materials by a hopper and starting an extruder to extrude a concrete slab blank, extruding and molding the concrete partition board blank, wherein the concrete partition board blank advances, the upper surface and the lower surface of the concrete partition board blank are tightly attached to adjacent roller groups, grid cloth adhered with cementing slurry is clamped between the concrete partition board blank and the roller groups, and the grid cloth is adhered to the concrete partition board blank and advances synchronously with the concrete partition board blank;
cutting off the concrete partition board blank and the grid cloth adhered with the cementing slurry on a transmission platform simultaneously according to the design length requirement by adopting a high-speed cutting machine, and cutting out the concrete partition board with the grid cloth on two sides; conveying and maintaining, and demolding, stacking and storing for later use after the strength of the concrete reaches above C15;
thus, the preparation of the extrusion type concrete partition board with the grid cloth on the two sides is completed.
Through the design scheme, the invention can bring the following beneficial effects: the preparation method of the extrusion type concrete partition board with the two sides and the grid cloth can efficiently produce the concrete partition board with the two sides and the grid cloth and excellent bending resistance at low cost, and has strong market competitive advantage.
Drawings
The invention is further described with reference to the following figures and detailed description:
FIG. 1 is a schematic longitudinal section of a double-faced and grid-cloth-added concrete partition board production device of the present invention.
FIG. 2 is a schematic cross-sectional view of a concrete partition board with a double-sided grid cloth according to the present invention.
In the figure, 1-a concrete partition board with grid cloth on both sides, 2-a grid cloth rolling frame, 3-a cementing slurry groove, 4-cementing slurry, 5-a roller group and 6-grid cloth.
Detailed Description
A preparation method of an extrusion type concrete partition board with two sides and grid cloth as shown in figures 1 and 2 comprises the following steps which are sequentially carried out,
step one, adding a concrete partition board and a grid cloth device on an extrusion type concrete slab production line
The existing conventional production process of the extruded concrete partition board is improved, two sets of concrete partition board and grid cloth devices are added and are respectively positioned at the bottom and the top of the extruded concrete partition board production equipment, the concrete partition board and grid cloth device at the bottom is used for adding grid cloth 6 to the lower surface of the concrete partition board 1 with the grid cloth on the double surfaces, and the concrete partition board and grid cloth device at the top is used for adding grid cloth 6 to the upper surface of the concrete partition board 1 with the grid cloth on the double surfaces; the concrete partition board and grid cloth adding devices comprise grid cloth rolling frames 2, cementing slurry tanks 3 and roller groups 5, wherein the grid cloth rolling frames 2 are used for placing grid cloth 6; the cementing slurry tank 3 is used for containing cementing slurry 4; the roller group 5 comprises more than one cylindrical roller which is respectively arranged at the upper part of the cementing slurry tank 3 and the upper side and the lower side of the blank discharge end of the concrete partition board, wherein the lower roller group 5 can be sleeved with a conveying belt in a segmented manner;
step two, preparation of adding grid cloth on two sides of concrete partition board
Installing the grid cloth rolling frame 2 provided with the grid cloth 6 on a station, pulling out the grid cloth 6, and continuously winding the grid cloth 6 on a roller wheel to enable the grid cloth 6 to pass through the lower part of the roller wheel in the cementing slurry tank 3 until the end part of the double-sided grid cloth concrete partition board 1 adjacent to the roller wheel group 5, wherein the grid cloth 6 is a cloth-shaped fabric with tensile strength of more than 50MPa fiber; injecting cementing slurry 4 into the cementing slurry tank 3, wherein the cementing slurry 4 is a mixture of an inorganic or organic cementing material and water;
step three, preparing the concrete partition board 1 with the grid cloth on the two sides
After the hopper is fed, the extruder is started to begin to extrude the blank of the concrete partition board, after the extruded blank of the concrete partition board is formed, the upper surface and the lower surface of the extruded blank of the concrete partition board can be clung to the adjacent roller groups 5 along with the advancing of the blank of the concrete partition board, a grid cloth 6 adhered with cementing slurry 4 is clamped between the blank of the concrete partition board and the roller groups 5, and the grid cloth 6 is adhered to the blank of the concrete slab and advances synchronously with the blank of the concrete partition board;
cutting off the concrete partition board blank and the grid cloth 6 adhered with the cementing slurry 4 on a transmission platform according to the design length requirement by a conventional method through a high-speed cutting machine, and cutting out the concrete partition board 1 with the grid cloth on two sides; setting a roller group 5 corresponding to the bottom of the long section of the double-sided grid cloth-added concrete partition board 1 into a turnover mode, placing the double-sided grid cloth-added concrete partition board 1 on a steel plate supporting die by using a turnover machine, then conveying for maintenance, and stacking and storing for later use after the concrete strength reaches above C15;
thus, the preparation of the extrusion type concrete partition board with the grid cloth on the two sides is completed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A preparation method of an extrusion type concrete partition board with two sides added with grid cloth is characterized by comprising the following steps: comprises the following steps which are sequentially carried out,
step one, adding a grid cloth device to an extrusion type concrete slab production line
The method comprises the following steps that two sets of concrete partition plate and grid cloth devices are additionally arranged at the discharge end of an extrusion type concrete slab production line, the two sets of concrete partition plate and grid cloth devices are respectively positioned at the bottom and the top of the discharge end of concrete partition plate production equipment, each concrete partition plate and grid cloth device comprises a grid cloth rolling frame (2), a cementing slurry tank (3) and a roller set (5), and the grid cloth rolling frame (2) is used for placing grid cloth (6); the cementing slurry groove (3) is used for containing cementing slurry (4); the roller group (5) comprises more than one cylindrical roller which is respectively arranged at the upper part of the cementing slurry tank (3) and the upper side and the lower side of the concrete partition board blank material discharge end corresponding to the concrete partition board blank material, wherein the lower roller group (5) can be sleeved with a conveying belt in a segmented manner;
step two, preparation of adding grid cloth on two sides of concrete partition board
Installing a grid cloth rolling frame (2) provided with grid cloth (6) on a station, pulling out the grid cloth (6) from the station, and continuously winding the grid cloth (6) on a roller wheel to ensure that the grid cloth (6) passes through the lower part of the roller wheel in a cementing slurry groove (3) until the end part of an adjacent roller wheel group (5) of a double-sided grid cloth-added concrete partition board (1), wherein the grid cloth (6) is a cloth-shaped fabric with tensile strength of more than 50MPa fiber; cementing slurry (4) is injected into the cementing slurry tank (3), and the cementing slurry (4) is a mixture of an inorganic or organic cementing material and water;
step three, preparing the concrete partition board (1) with the grid cloth on the two sides
Feeding materials by a hopper and starting an extruder to extrude a concrete slab blank, extruding and molding the concrete partition board blank, wherein the concrete partition board blank advances, the upper surface and the lower surface of the concrete partition board blank are clung to an adjacent roller group (5), a grid cloth (6) adhered with cementing slurry (4) is clamped between the concrete partition board blank and the roller group (5), and the grid cloth (6) is adhered to the concrete partition board blank and advances synchronously with the concrete partition board blank;
cutting off the concrete partition board blank and the grid cloth (6) adhered with the cementing slurry (4) on a transmission platform simultaneously according to the design length requirement by adopting a high-speed cutting machine, and cutting out the concrete partition board (1) with the grid cloth on two sides; conveying and maintaining, and demolding, stacking and storing for later use after the strength of the concrete reaches above C15;
thus, the preparation of the extrusion type concrete partition board with the grid cloth on the two sides is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910928150.1A CN110625739B (en) | 2019-09-28 | 2019-09-28 | Preparation method of extrusion type concrete partition board with two sides provided with grid cloth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910928150.1A CN110625739B (en) | 2019-09-28 | 2019-09-28 | Preparation method of extrusion type concrete partition board with two sides provided with grid cloth |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110625739A true CN110625739A (en) | 2019-12-31 |
| CN110625739B CN110625739B (en) | 2020-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910928150.1A Active CN110625739B (en) | 2019-09-28 | 2019-09-28 | Preparation method of extrusion type concrete partition board with two sides provided with grid cloth |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113172729A (en) * | 2021-04-25 | 2021-07-27 | 吉林建筑大学 | Production line and method for preparing double-sided fiber mesh cement board |
| CN113442268A (en) * | 2021-06-17 | 2021-09-28 | 长春市建林教育咨询有限公司 | Production line and application of double-sided fiber mesh cement board |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113172729A (en) * | 2021-04-25 | 2021-07-27 | 吉林建筑大学 | Production line and method for preparing double-sided fiber mesh cement board |
| CN113442268A (en) * | 2021-06-17 | 2021-09-28 | 长春市建林教育咨询有限公司 | Production line and application of double-sided fiber mesh cement board |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110625739B (en) | 2020-12-08 |
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