CN113044597A - Feeding system and method for PVC powder - Google Patents
Feeding system and method for PVC powder Download PDFInfo
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- CN113044597A CN113044597A CN202110396156.6A CN202110396156A CN113044597A CN 113044597 A CN113044597 A CN 113044597A CN 202110396156 A CN202110396156 A CN 202110396156A CN 113044597 A CN113044597 A CN 113044597A
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- 238000000034 method Methods 0.000 title claims abstract description 16
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- 238000002156 mixing Methods 0.000 claims abstract description 89
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- 238000004519 manufacturing process Methods 0.000 claims abstract description 47
- 239000002994 raw material Substances 0.000 claims abstract description 35
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
- B65G65/34—Emptying devices
- B65G65/40—Devices for emptying otherwise than from the top
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
- B29B7/24—Component parts, details or accessories; Auxiliary operations for feeding
- B29B7/242—Component parts, details or accessories; Auxiliary operations for feeding in measured doses
- B29B7/244—Component parts, details or accessories; Auxiliary operations for feeding in measured doses of several materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
- B29B7/28—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/54—Large containers characterised by means facilitating filling or emptying
- B65D88/64—Large containers characterised by means facilitating filling or emptying preventing bridge formation
- B65D88/66—Large containers characterised by means facilitating filling or emptying preventing bridge formation using vibrating or knocking devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/48—Arrangements of indicating or measuring devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
- B65G53/16—Gas pressure systems operating with fluidisation of the materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/36—Arrangements of containers
Abstract
The invention relates to a feeding system and method for PVC powder, and belongs to the technical field of PVC powder mixing equipment. The system comprises a plurality of raw material bins and auxiliary material bins, and is characterized by further comprising a plurality of high-speed mixing machines for mixing raw materials and auxiliary materials, wherein the plurality of high-speed mixing machines are divided into a first high-speed mixing machine set and a second high-speed mixing machine set, each high-speed mixing machine in the first high-speed mixing machine set is respectively communicated with the raw material bins and the auxiliary material bins, each high-speed mixing machine of the second high-speed mixing machine set is used for stirring pigments with different colors, a discharge port of each high-speed mixing machine of the first high-speed mixing machine set is connected to a finished product bin, a discharge port of the finished product bin is communicated with a first transition bin on a production line, a discharge port of each high-speed mixing machine of the second high-speed mixing machine set is respectively communicated with a second transition bin on the production line through a pipeline, and the first transition bin and the second transition bin.
Description
Technical Field
The invention belongs to the technical field of PVC powder mixing equipment, and particularly relates to a feeding system and method for PVC powder.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In the prior art, the raw materials for PVC products such as extrusion, injection molding and the like are powder materials. The production, mixing and conveying links of PVC products relate to a plurality of links such as raw material feeding, formula weighing, high-speed mixing, mixture conveying and the like, the processes are generally semi-automatic, and the problems that the field environment is seriously polluted by dust, the labor intensity is high, the number of uncertain factors is large, the quality stability of the products is influenced by the mixing and feeding processes and the like exist. Moreover, the PVC product has more colors, the production line needs to clean the mixing material and the extruding equipment when changing the colors, the color changing effect can be achieved, and a large amount of waste products can be caused by the color changing of the production line. Moreover, dry mix pollution caused by simultaneous mixing of multiple colors can also occur in the mixing process.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a feeding system and method for PVC powder.
The embodiment of the invention provides a feeding system for PVC powder, which comprises a plurality of raw material bins and auxiliary material bins, and further comprises a plurality of high-speed mixing machines for mixing raw materials and auxiliary materials, wherein the plurality of high-speed mixing machines are divided into a first high-speed mixing machine set and a second high-speed mixing machine set, each high-speed mixing machine in the first high-speed mixing machine set is respectively communicated with the raw material bins and the auxiliary material bins, each high-speed mixing machine in the second high-speed mixing machine set is used for mixing pigments with different colors, a discharge port of each high-speed mixing machine in the first high-speed mixing machine set is connected to a finished product bin, a discharge port of the finished product bin is communicated with a first transition bin on a production line, a discharge port of each high-speed mixing machine in the second high-speed mixing machine set is respectively communicated with a second transition bin on the production line through a pipeline, and the first transition bin and the second transition bin are.
Furthermore, a cold mixing unit is arranged at the bottom of the high mixing machine, and a material transition bin is connected to the bottom of the cold mixing unit.
Further, a weighing module and a stepping feeder are arranged above the high-speed mixer.
Further, the top of the high-speed mixer is communicated with the raw material bin and the auxiliary material bin through a Roots blower and a pipeline.
Furthermore, a bin body of the raw material bin is provided with a material level meter and an air hammer device.
Further, be equipped with charge level indicator and pneumatic hammer device on the storehouse body of auxiliary material storehouse, be in simultaneously the bottom of auxiliary material storage silo is equipped with the storehouse of weighing, and the auxiliary material transition storehouse is connected to the bottom in the storehouse of weighing, the auxiliary material transition storehouse is connected with the height machine of mixing.
Furthermore, the high-speed mixer, the finished product bin and the first transition bin in the production line are connected through a Roots blower and a pipeline.
Further, the raw material bin and the auxiliary material bin are connected with a feeding station through a Roots blower and a pipeline.
Further, the first transition bin and the second transition bin are connected with the mixing machine through a Roots blower and a pipeline phase.
The embodiment of the invention also provides a working method of the feeding system for the PVC powder based on any one of the above, which comprises the following steps:
uniformly conveying the materials in the raw material bin and the auxiliary material bin to each high mixing machine in the first high mixing machine set for mixing to form a finished product material, and conveying the mixed finished product material to a finished product material bin for standing; then the first transition bin is conveyed to a production line;
meanwhile, diluting the pigments with different colors through each high mixing machine in the second high mixing machine set, and conveying the diluted pigments to a second transition bin on the production line according to the required colors;
the materials in the first transition bin and the second transition bin are respectively extracted and mixed after being weighed by a mixing device on the production line, so that the mixture of the materials and the pigment is realized
The invention has the following beneficial effects:
according to the PVC powder feeding system, the finished materials and the color materials are conveyed and separated, the finished materials are mixed by the high mixing machines in the first high mixing machine set and then are placed in the finished product bin and further conveyed into the transition bin of the production line, and each high mixing machine in the second high mixing machine set directly conveys the diluted color materials to the other transition bin of the production line, so that the finished materials and the color materials can be mixed on site on the production line, and the working efficiency is improved.
The PVC powder feeding system provided by the invention can realize the simultaneous production of multiple colors through the high mixing machine in the second high mixing machine set, so that the colors between the simultaneous production of multiple color materials are free from color cross talk and pollution, the effectiveness can be ensured in the color switching process, the color switching time and the color switching efficiency are greatly improved, the output of color-switching waste products and the pollution between colors are greatly reduced, and the output of waste products is reduced in the color switching process.
Drawings
Fig. 1 is an overall structural diagram of an automatic centralized feeding system device for PVC powder according to an embodiment of the present invention.
In the figure: 1. raw materials pouring station, 2, raw materials storage silo, 3, auxiliary materials pouring station, 4, auxiliary materials storage silo, 5, auxiliary materials weigh the storehouse, 6, auxiliary materials transition bin, 7, step-by-step feeder, 8, high quick-witted storehouse of weighing that mixes, 9, high quick-witted transition bin that mixes, 10, finished product feed bin, 11, the mixing arrangement on the production line.
Detailed Description
As shown in fig. 1, an embodiment of the present invention provides an automatic centralized feeding system device for PVC powder, which mainly includes a raw material storage bin 2 for placing PVC raw material, an auxiliary material storage bin 4 for placing auxiliary material, a high mixing unit for mixing raw material and auxiliary material, a finished product storage bin 10 for placing finished product after mixing, and each mixer 11 on a production line.
The high-speed mixer sets in this embodiment are mainly divided into two groups, as shown in fig. 1, from left to right, the left two are a group, and the right two are a group, in this embodiment, the left two groups are referred to as the material group, and the right two groups are referred to as the pigment group. The pigment is a pigment which is subsequently mixed with the finished material. Each high-speed mixer in the pigment group is respectively corresponding to materials with different colors.
In addition, the high-speed mixer in the embodiment generally refers to a high-speed mixer in the plastic industry, and is mainly suitable for mixing and stirring materials such as powder, particles, auxiliaries, toner, color masterbatch and plastics, and belongs to the existing structure, which is not shown in the figure.
In the embodiment of the invention, the feed inlet of each high-speed mixer in the material group is respectively connected with the discharge outlets of the raw material bin and the auxiliary material bin through a pipeline and the Roots blower, and the discharge outlet of each high-speed mixer in the material group is connected with the feed inlet of the finished product bin of the Roots blower through a pipeline, so that the raw material and the auxiliary material are mixed in the high-speed mixer, then are conveyed to the finished product bin 10 to be placed for a period of time, and are extracted from the finished product bin 10 when needed, and thus, the material production is more stable. The outlet of the finished product bin 10 is connected with a first transition bin in the production line through a pipeline.
Further, the high mixers in the color kit of the present example are used to dilute the color pigments, each high mixer in the color kit is used to dilute a different color pigment, and then the outlet of each high mixer is connected to a second transition bin on the production line via a line.
Finally, the finished material in the first transition bin and the color material in the second transition bin are extracted by a mixer 11 on the production line for on-site mixing use.
Therefore, the automatic centralized feeding system equipment for PVC powder provided by the embodiment of the invention realizes the conveying and separation of finished product materials and color materials, the finished product materials are placed in a finished product bin, finally, the color material is conveyed to a transition bin on a production line, the color material is connected with another transition bin on the production line through a Roots blower and a pipeline, thus the color material and the finished product material are directly mixed and used on site on the production line, meanwhile, each high-speed mixer in the pigment group can correspond to different colors and is finally input into a production line, and through implementing a color-pipeline, can realize the simultaneous production of a plurality of colors, achieves the effects that the colors of the materials with a plurality of colors are not mixed and polluted during the simultaneous production, the color changing device has the advantages that the effectiveness can be guaranteed in the color changing process, the color changing time and the color changing efficiency are greatly improved, the color changing waste product yield and the pollution between colors are greatly reduced, and the waste product yield is reduced in the color changing process.
The invention can produce more than 3 color products simultaneously, ensures that the colors are not mixed and ensures the high-speed stable production of the production line.
Specifically, as shown in fig. 1, a raw material dumping station 1 is connected to a raw material storage bin 2, and an auxiliary material dumping station 3 is connected to a feed inlet of an auxiliary material storage bin 4 in this embodiment, these dumping stations can implement feeding means such as bagging, ton-bag or tank car, and manually or automatically feed the raw material storage bin and the auxiliary material storage bin through multiple modes such as positive pressure and negative pressure mechanical conveying, so as to implement material supply.
The top of the raw material storage bin 2 and the auxiliary material storage bin 4 are connected with the material pouring station through a Roots blower and a pipeline, wherein the Roots blower is mainly used for conveying materials.
Furthermore, the auxiliary material weighing bin 5 and the auxiliary material transition bin 6 are arranged at the bottom of the auxiliary material storage bin 4 in the embodiment of the invention, at present, a large-range hopper is generally used for metering PVC ingredients at home and abroad, however, the large-range hopper cannot balance weights for the auxiliary materials with relatively small balance weight proportion, accurate metering and feeding are required manually, manual metering is prone to error, and toxic dust substances are prone to being inhaled to cause damage to health, so that the auxiliary material weighing bin 5 is arranged to replace manual metering, the accuracy of ingredients is improved, and meanwhile, the safety of operators is protected.
The auxiliary material transition bin 6 is used for temporarily storing the symmetrical materials in a transition mode, and then enters the feed inlet of the high-speed mixer in the material group through the pipeline at the bottom.
As shown in fig. 1, 2 transition bins are provided at the bottom of 8 auxiliary material bins in this embodiment, and these two transition bins are directly connected to each high-speed mixer in this material group and transported by roots blower.
The bin bodies of the four raw material storage bins 2 in the embodiment of the invention are respectively provided with a material level meter and an air hammer device, wherein the air hammer devices are mainly used for promoting the falling of materials, and the material level meters are mainly used for detecting the falling condition of the materials and realizing the monitoring function in a control system in the system.
The bottom in each raw material storage bin 2 is provided with a spiral structure for conveying materials, and a discharge port of each raw material storage bin 2 is connected with a feed inlet of the high-speed mixer through a Roots blower and a pipeline.
Further, the top of every high machine that mixes on the high machine group in this example all sets up prepares a step-by-step feeder 7, carries to the high machine that mixes through this step-by-step feeder 7 difficult unloading and pigment, simultaneously the top of high machine that mixes still is equipped with high machine and weighs storehouse 8 and carries out high-speed mixing to the required raw and auxiliary materials of PVC production on the basis of accurate weighing raw and auxiliary materials.
And a cold mixing unit is arranged at the lower part of each high mixing machine in the high mixing unit and used for cooling materials.
Further, a high-mixing transition bin 9 is further arranged below the cold mixing unit on each high-mixing machine, an air hammer is further arranged in the high-mixing transition bin, and materials in the bin are discharged into the raw material bin or the transition bin on the production line through the air hammer.
Furthermore, a roots blower is arranged at the middle upper part of each finished product bin in the embodiment of the invention and used for conveying materials, 4 finished product bins are connected with a transition bin at the lower part of a cold mixing unit in a high mixing machine in the pigment group by pipelines and used for conveying materials in the transition bin to the 4 finished product bins, and the cold mixing unit in the high mixing machine in the pigment group is directly connected with the roots blower by the pipelines and directly conveyed to the transition bin on a production line.
In the embodiment of the invention, 2 transition bins and 1 mixing unit are arranged at the upper part of the production line, one transition bin is used for storing finished products, the other transition bin is used for storing color materials, the two transition bins are respectively connected with the mixing unit on the production line through a Roots blower and a pipeline, the color materials and the finished products are respectively extracted and conveyed to the mixing unit for mixing.
Besides, the automatic centralized feeding system equipment for the PVC powder provided by the embodiment comprises a control system, and the control system is used for realizing a central control system of the whole automatic centralized feeding, compounding and conveying system. The control system controls the operation of the whole set of system and monitors the state of each node of the set of system, such as: material condition, temperature, pressure, states of control valves, running state of high mixing unit, running condition of conveying pipelines and the like. And the control system can realize data collection, data summarization, data statistics and data analysis on system data. The order accounting is realized through the weighing module and the metering device of each device, a report is automatically generated according to the order of the production line, and the automatic statistic analysis and the input-output accounting of the production and output costs of the product are realized.
The following describes in detail the specific implementation process of the automatic centralized feeding system for PVC powder provided in this embodiment: the method comprises the following steps of conveying materials to a raw material discharging bin 2 through a raw material dumping station 1 for storing the raw materials, and conveying auxiliary materials into an auxiliary material storage bin 4 through an auxiliary material dumping station 3 for storing the auxiliary materials;
setting various control parameters in a control system, starting a power supply, starting the equipment to automatically operate, controlling the opening of an air hammer and a valve in the control system to output various materials from an outlet, transmitting the material level to the control system by a material level meter arranged in each bin in real time, and controlling the Roots blower and a feeder to work by the control system;
carry out high-speed mixing in passing through the pipe-line with all materials and auxiliary material to the high unit that mixes, the high unit that mixes in the height simultaneously mixes starts, take the temperature to reach the back, the material is carried to the cold unit that mixes, cool down the processing to the high material that mixes, wherein in two high machine that mix in this material group handle the back and carry the material to the transition storehouse in the high machine that mixes, according to system control, carry the material to finished product feed bin 10 in through controlling the roots blower, and then carry to the first transition storehouse on production line upper portion in the finished product feed bin 10, the high machine that mixes in the pigment group handles and finishes directly carrying the material to production line upper portion second transition storehouse after diluting pigment, according to system control, mix after weighing the measurement in carrying to the unit that mixes the material from first transition storehouse and second transition storehouse through controlling the roots blower from production line upper portion. The main high-speed mixer is used for mixing the pigment, the zero-pollution production effect of the white pigment can be realized, and the auxiliary high-speed mixer is used for mixing diluted color materials with more than 3 colors.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a feeding system for PVC powder, includes a plurality of former feed bin and auxiliary material storehouse, its characterized in that still includes a plurality of height machine of mixing that are used for mixing raw materials and auxiliary material, a plurality of height machine of mixing divide into first height and mixes the machine group and the high machine group that mixes of second, wherein every height in the first height mixes the machine group and mixes the machine respectively with former feed bin and auxiliary material storehouse and be linked together, every height that the second height mixes the machine group is used for mixing the colouring material of different colours, the discharge gate of every height in the first height mixes the machine group is connected to the finished product storehouse, the discharge gate and the first transition storehouse on the production line of finished product storehouse are linked together, the discharge gate of every height that the machine group was mixed to the second through pipeline respectively and the second transition storehouse on the production line is linked together, first transition storehouse and second transition storehouse are all connected to on same extruder.
2. The feeding system for PVC powders according to claim 1, wherein the bottom of the high-speed mixer is provided with a cold mixer set, and the bottom of the cold mixer set is connected with a material transition bin.
3. The feeding system for PVC powders according to claim 2, wherein a weighing module and a step feeder are provided above the high-speed mixer.
4. The feeding system for PVC powders as claimed in claim 3, wherein the top of the high-speed mixer is connected with the raw material bin and the auxiliary material bin through a Roots blower and a pipeline.
5. The PVC powder feeding system according to claim 1, wherein the bin body of the raw material bin is provided with a level gauge and an air hammer device.
6. The feeding system of PVC powder of claim 1, wherein the auxiliary storage bin is provided with a level meter and a pneumatic hammer device on its bin body, and a weighing bin is provided at the bottom of the auxiliary storage bin, the bottom of the weighing bin is connected with an auxiliary transition bin, and the auxiliary transition bin is connected with the high-speed mixer.
7. The feeding system for PVC powder according to claim 1, wherein the high-speed mixer is connected with the finished product bin and the first transition bin in the production line through Roots blower and pipes.
8. The feeding system for PVC powder according to claim 1, wherein the raw material bin and the auxiliary material bin are connected to the feeding station through Roots blower and pipeline.
9. The feeding system for PVC powders according to claim 1, wherein the first transition bin and the second transition bin are connected to the mixing machine through Roots blower and pipeline phase.
10. Method for operating a feeding system for PVC powders according to any of claims 1 to 9,
uniformly conveying the materials in the raw material bin and the auxiliary material bin to each high mixing machine in the first high mixing machine set for mixing to form a finished product material, and conveying the mixed finished product material to a finished product material bin for standing; then the first transition bin is conveyed to a production line;
meanwhile, diluting the pigments with different colors through each high mixing machine in the second high mixing machine set, and conveying the diluted pigments to a second transition bin on the production line according to the required colors;
the materials in the first transition bin and the second transition bin are respectively extracted by a mixing device on a production line through weighing and metering to be mixed, so that the materials and the pigments are mixed.
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| CN202110396156.6A CN113044597A (en) | 2021-04-13 | 2021-04-13 | Feeding system and method for PVC powder |
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| CN202110396156.6A CN113044597A (en) | 2021-04-13 | 2021-04-13 | Feeding system and method for PVC powder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113733385A (en) * | 2021-08-03 | 2021-12-03 | 山东红花防水建材有限公司 | Raw material feeding structure for PVC waterproof material production and use method thereof |
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Application publication date: 20210629 |