CN113681777B - Melt conveying method and equipment - Google Patents
Melt conveying method and equipment Download PDFInfo
- Publication number
- CN113681777B CN113681777B CN202111010847.4A CN202111010847A CN113681777B CN 113681777 B CN113681777 B CN 113681777B CN 202111010847 A CN202111010847 A CN 202111010847A CN 113681777 B CN113681777 B CN 113681777B
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- melt
- pipeline
- finished product
- conveying
- pump
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000155 melt Substances 0.000 claims abstract description 93
- 238000004519 manufacturing process Methods 0.000 claims abstract description 42
- 238000009826 distribution Methods 0.000 claims abstract description 33
- 239000004033 plastic Substances 0.000 claims abstract description 20
- 229920003023 plastic Polymers 0.000 claims abstract description 20
- 239000000047 product Substances 0.000 claims description 53
- 239000007795 chemical reaction product Substances 0.000 claims description 4
- 239000011265 semifinished product Substances 0.000 claims 1
- 230000001276 controlling effect Effects 0.000 abstract description 8
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 229920000728 polyester Polymers 0.000 description 8
- -1 Polyethylene Polymers 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- 229920006255 plastic film Polymers 0.000 description 4
- 239000002985 plastic film Substances 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000289 melt material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
- B29C31/04—Feeding of the material to be moulded, e.g. into a mould cavity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Robotics (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The application discloses melt conveying equipment, which comprises a melt conveying master pump, a finished product manufacturing device, a granulating device and a flow distribution valve, wherein the flow distribution valve synchronously conveys one part of melt conveyed by the melt conveying master pump to the finished product manufacturing device through a pipeline and conveys the rest part of melt to the granulating device through a pipeline; two pipelines are arranged in parallel between the flow distribution valve and the finished product manufacturing device, wherein the flow rate of the melt in the first pipeline is controlled by the pressure in the second pipeline. In addition, the application also discloses a melt conveying method. According to the application, by arranging two pipelines in parallel, wherein the first pipeline is used as a compensation pipeline, the second pipeline is used as a main conveying pipeline, and the first pipeline is responsible for regulating and controlling melt fluctuation in the downstream direction while carrying additional demand, so that flaws of a plastic finished product are reduced, and the quality of the finished product is improved.
Description
Technical Field
The application relates to a plastic product production technology in the chemical field, in particular to a melt conveying method and equipment in the plastic product production process.
Background
Plastic products are very widely used in industrial and living fields. Common plastic products include various plastic films, plastic fiber filaments, etc. prepared from thermoplastic polymer compounds such as Polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), polyester (PET), polypropylene (PP), nylon, etc.
In the prior art document "problems and solutions in melt conveying systems" (synthetic fibers, 2002, 03, zhang Yumei), the process flow of conveying melt from a final polymerization vessel of a polyester device to a filament device via a melt discharge pump and then to twelve filament lines via a multiplex valve and three booster pumps was analyzed. It is mentioned that the system employs a cascade control scheme in order to stabilize the melt delivery pressure. In the face of problems with flow pressure control in which the pressure transmitter is located closer to the booster pump, the pulse signal generated during operation of the booster pump causes an imbalance in the operation of the controller, and the booster pump is stopped without any trouble, this document mentions a technical solution for adjusting the position of the pressure transmitter.
CN 101481827B discloses a method and system for controlling the pressure of polyester melt, the control of the pressure of polyester melt is divided into five control links of flow control of a polyester melt discharging pump, pressure control after a final melt-collecting filter, speed control of a melt discharging pump, flow control of a granulator and speed control of the granulator, the flow control of the polyester melt discharging pump, the pressure control after the final melt-collecting filter and the flow control of the granulator are composed of a main loop and an auxiliary loop to form a cascade control loop, the speed control of the melt discharging pump is controlled by a speed PID control module of the melt discharging pump, and the speed control of the granulator is controlled by a speed PID control module of the granulator.
From the description of the prior art above, it can be seen that the prior art control of melt flow only resides in the stage of simple cascade control of melt flow by pressure feedback. However, since the viscosity of the plastic melt is much greater than other fluids, there is a problem of lag in melt flow relative to pressure feedback. That is, measures are taken to control the flow rate when the measured melt pressure exceeds (or falls below) the threshold value, and the amount of melt actually delivered in the delivery conduit has exceeded (or fallen well below) the threshold value. On the other hand, if the position of the pressure transmitter is adjusted as close as possible to the melt distribution valve, the melt distribution valve needs to be adjusted immediately due to the instantaneous change of the pressure, the control signal is easily caused to diverge by the intense instantaneous adjustment to cause control failure, and the intense transmission pulse is caused by the intense instantaneous change of the flow, so that the stability of transmission is damaged.
In a word, the existing melt conveying system is difficult to obtain a stable conveying effect through simple cascade control, and is not beneficial to obtaining excellent plastic finished products in the subsequent preparation process.
Disclosure of Invention
The technical problem to be solved by the present application is to provide a melt conveying method and apparatus, which reduces or avoids the aforementioned problems.
In order to solve the technical problems, the application provides melt conveying equipment, which comprises a melt conveying master pump, a finished product manufacturing device, a granulating device and a flow distribution valve, wherein the flow distribution valve synchronously conveys part of melt conveyed by the melt conveying master pump to the finished product manufacturing device through a pipeline and conveys the rest of melt to the granulating device through a pipeline; two pipelines are arranged in parallel between the flow distribution valve and the finished product manufacturing device, wherein the flow rate of the melt in the first pipeline is controlled by the pressure in the second pipeline.
Preferably, a compensation delivery pump for controlling the flow rate of the melt is arranged in the first path pipeline, and a pressure transmitter for detecting the pressure of the melt is arranged in the second path pipeline.
Preferably, the inlet of the first pipeline is arranged after the flow distribution valve and before the pressure transmitter, and the outlet of the first pipeline is arranged before the finished product manufacturing device and after the flow distribution valve.
Preferably, a metering pump for metering the flow rate of the melt is further arranged in the second path pipeline, and the metering pump is arranged at the downstream of the pressure transmitter; the inlet of the first pipeline is arranged behind the flow distribution valve and in front of the pressure transmitter, and the outlet of the first pipeline is arranged in front of the finished product manufacturing device and behind the metering pump.
Preferably, the length Δl of the pipe between the metering pump and the pressure transmitter is different from the start time difference Δt of the flow rate change of the metering pump and the pressure change of the pressure transmitter, and the ratio Δl/Δt therebetween is used as a gradient value for controlling the compensation of the opening change of the delivery pump.
Preferably, the melt delivery master cylinder delivers a greater amount of melt than is required by the finished product manufacturing apparatus.
Preferably, the total flow of the first and second conduits is equal to the required amount of the finished product manufacturing apparatus.
In addition, the application also provides a melt conveying method, which comprises the following steps: synchronously conveying a part of the melt conveyed by the melt conveying master pump to a finished product manufacturing device and conveying the rest of the melt to a granulating device through at least one flow distribution valve; and conveying the melt conveyed to the finished product manufacturing device through two pipelines connected in parallel, wherein the flow rate of the melt in the first pipeline is controlled by the pressure in the second pipeline.
According to the application, by arranging two pipelines in parallel, wherein the first pipeline is used as a compensation pipeline, the second pipeline is used as a main conveying pipeline, and the first pipeline is responsible for regulating and controlling melt fluctuation in the downstream direction while carrying additional demand, so that flaws of a plastic finished product are reduced, and the quality of the finished product is improved.
Drawings
The following drawings are only for purposes of illustration and explanation of the present application and are not intended to limit the scope of the application.
In which fig. 1 shows a schematic view of a melt conveying apparatus according to an embodiment of the present application.
Fig. 2 shows a schematic view of a melt conveying apparatus according to another embodiment of the present application.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present application, a specific embodiment of the present application will be described with reference to the accompanying drawings. Wherein like parts are designated by like reference numerals.
The present application provides a melt conveying apparatus as shown in fig. 1, which can be used to convey melts of various plastic resins including, but not limited to, thermoplastic high molecular compounds such as polyethylene, polyvinyl chloride, polystyrene, polyester, polypropylene, nylon, etc., to a finished product manufacturing device to prepare various plastic finished products. The plastic finished product includes, but is not limited to, plastic films, fiber filaments, and the like.
As shown in the drawing, the melt conveying apparatus provided by the present application comprises a melt conveying pump 100, at least one finished product manufacturing device 200, at least one granulating device 300 and at least one flow distribution valve 10, wherein the flow distribution valve 10 synchronously conveys a part of the melt conveyed by the melt conveying pump 100 to the finished product manufacturing device 200 through a pipeline, and conveys the rest of the melt to the granulating device 300 through a pipeline. The melt can be directly from a melt discharge tank of a polymerization terminal, or can be indirectly from a resin melt obtained by remelting a polymerization master batch. The apparatus 200 may be any conventional apparatus for manufacturing plastic products, including a stretch forming apparatus for plastic film, a drawing apparatus for plastic filaments, etc.
In the prior art, a granulating device is generally used as a backup of a finished product manufacturing device, and a melt conveying master pump conveys all melt to the finished product manufacturing device, so that when the finished product manufacturing device is stopped due to a problem, the melt is conveyed to the granulating device. This does not solve the problem of a low melt flow in the finished product direction. In the melt conveying scheme, the melt is synchronously conveyed in two directions, and when the melt flow in the finished product direction fluctuates, the melt flow in the granulating direction can be increased, decreased and controlled.
That is, in the present application, the amount of the melt supplied from the melt supply pump 100 is larger than the required amount of the finished product manufacturing apparatus 200, so that the opening degree of the flow distribution valve 10 can be flexibly controlled according to the required amount of the finished product manufacturing apparatus 200, so that the amount of the melt supplied to the granulating apparatus 300 is changed to satisfy the required direction of the finished product. Since the pelleting device 300 obtains a semi-finished plastic product, the melt flow in the pelleting direction does not need to be precisely controlled, and the product manufacturing device 200 obtains a finished plastic product such as a plastic film, a fiber filament, etc., and the melt flow in the direction needs to be precisely controlled to obtain a high-quality finished plastic product.
In addition, as shown, two lines are provided in parallel between the flow distribution valve 10 and the end product manufacturing apparatus 200, wherein the melt flow in the first line 20 is controlled by the pressure in the second line 30. In a specific embodiment, a compensation feed pump 21 for melt flow control is provided in the first conduit 20 and a pressure transmitter 31 for detecting melt pressure is provided in the second conduit 30. In another embodiment, the inlet of first conduit 20 is positioned after flow distribution valve 10 and before pressure transmitter 31, and the outlet of first conduit 20 is positioned before end product manufacturing apparatus 200 and after pressure transmitter 31.
The application is provided with two pipelines connected in parallel, wherein the first pipeline 20 is used as a compensation pipeline, the second pipeline 30 is used as a main conveying pipeline, and the total flow of the first pipeline 20 and the second pipeline 30 is equal to the required quantity of the finished product manufacturing device 200. Normally, the second conduit 30 is used as the main conveying conduit for conveying a large part, e.g. 80%, of the required melt, and once the pressure in the second conduit 30 has become large as measured by the pressure transmitter 31, this means that the conveying amount in the direction of the product needs to be reduced, e.g. the melt pressure detected by the pressure transmitter controls the melt distribution amount of the flow distribution valve 10, and more melt is conveyed in the direction of pelletization. At this point, however, a portion of the excess melt has already accumulated in the second conduit 30 from the flow distribution valve 10 to the pressure transducer 31, which prior art has only been able to be fed downstream. The application, by providing the first channel 20, is responsible for regulating the melt fluctuation in the downstream direction while burdening the delivery of an additional, for example 20%, for example, by pumping away a portion of the backlog of excess melt by the compensating delivery pump 21, thereby buffer-distributing the excess melt over a relatively long downstream delivery distance over a period of time. Similarly, when the pressure in the second pipe 30 becomes smaller as measured by the pressure transmitter 31, the melt distribution amount of the flow distribution valve 10 is controlled by the melt pressure detected by the pressure transmitter, and the melt feed amount in the granulation direction is reduced. And simultaneously, the melt conveying quantity of the compensation conveying pump 21 in the first pipeline 20 is reduced, so that partial flow lacking in the second pipeline 30 can be partially supplemented in a period of time, and the melt flow reducing amplitude in the downstream direction can be reduced. The two pipelines are arranged in parallel, and although the fluctuation of melt conveying cannot be absolutely removed, the fluctuation can be balanced as much as possible, so that the quality of a subsequent finished product can be improved.
In addition, a metering pump 32 for metering the melt flow can also be provided in the second line 30, the metering pump 32 being arranged downstream of the pressure transmitter 31. At this time, the inlet of the first path pipe 20 is disposed after the flow distribution valve 10 and before the pressure transmitter 31, and the outlet of the first path pipe 20 is disposed before the finished product manufacturing apparatus 200 and after the metering pump 32.
Metering pump 32 is provided as a complementary design to pressure transmitter 31 for measuring the actual melt flow in second conduit 30. As previously mentioned, the melt conveying apparatus of the present application is not limited to the conveyance of one melt, and in some cases, it is also possible to convey melt materials of different compositions. The viscosity of the different melts will vary and the parameters controlling the flow of melt in the first conduit 20 by the pressure in the second conduit 30 will also vary. Therefore, in the above embodiment of the present application, the metering pump 32 is further disposed in the second pipeline 30, and the ratio Δl/Δt between the measured pipeline length Δl between the metering pump 32 and the pressure transmitter 31 and the difference Δt between the flow rate change of the metering pump 32 and the start time of the pressure change of the pressure transmitter 31 is used as the gradient value for controlling the opening change of the compensation delivery pump 21, so that the problem of controlling the compensation delivery pump 21 under different melt conditions can be perfectly solved, and the versatility of the apparatus is improved.
For example, when the flow rate of the downstream metering pump 32 changes, the pressure change does not reach the upstream pressure transmitter 31, the time difference Δt between the start of the change represents the time of the melt property transfer change, and the speed of obtaining the melt property transfer change can be calculated from the ratio of the pipe length Δl to the time difference Δt, which can be used just to control the gradient value for compensating the opening change of the transfer pump 21 gradually reaching the control value. For example, when the pressure change in the second pipeline 30 is measured by the pressure transmitter 31, the conveying amount of the compensation conveying pump 21 needs to be controlled to reach a certain control value, and at this time, the opening of the compensation conveying pump 21 is not adjusted to a required size at one time, but the opening of the compensation conveying pump 21 is gradually adjusted to the required size from zero by taking the value of DeltaL/Deltat as a gradient value for adjusting the opening, so that the technical effect of buffering and distributing the melt with different properties to a relatively long conveying distance at the downstream can be flexibly obtained.
The melt conveying method of the present application is further described below with reference to the accompanying drawings. Of course, the melt conveying process of the present application has been described in practice in the above description of the apparatus, and is supplemented by a summary of the application in a generalized form.
As shown in the drawing, the melt conveying method of the present application comprises the steps of: a part of the melt supplied from the melt supply pump 100 is supplied to the product manufacturing apparatus 200 and the rest is supplied to the granulating apparatus 300 through at least one flow distribution valve 10; the melt delivered to the end product manufacturing apparatus 200 is delivered through two channels in parallel, wherein the flow of melt in the first channel 20 is controlled by the pressure in the second channel 30.
In a specific embodiment, a plurality of flow distribution valves 10 may be disposed in parallel in the melt conveying apparatus, so as to convey the melt conveyed by the melt conveying main pump 100 to the plurality of finished product manufacturing devices 200 and the plurality of granulating devices 300 through the plurality of flow distribution valves 10 disposed in parallel, respectively, depending on the problem that the productivity of the melt matches the consumption of the finished product manufacturing devices. For example, assuming that the throughput of the melt is 50 tons per day and the consumption of one finishing line is 20 tons per day, it may be necessary to provide two finishing lines and 1-2 granulation lines, as shown in fig. 2.
It should be understood by those skilled in the art that while the present application has been described in terms of several embodiments, not every embodiment contains only one independent technical solution. The description is given for clearness of understanding only, and those skilled in the art will understand the description as a whole and will recognize that the technical solutions described in the various embodiments may be combined with one another to understand the scope of the present application.
The foregoing is illustrative of the present application and is not to be construed as limiting the scope of the application. Any equivalent alterations, modifications and combinations thereof will be effected by those skilled in the art without departing from the spirit and principles of this application, and it is intended to be within the scope of the application.
Claims (5)
1. A melt conveying method for a melt conveying apparatus comprising a melt conveying main pump (100), a finished product manufacturing device (200), a granulating device (300) and a flow distribution valve (10); wherein the granulating device (300) is a semifinished product of plastic products, the melt flow of which does not need to be precisely controlled; the finished product manufacturing device (200) obtains a plastic finished product, and the melt flow of the plastic finished product needs to be accurately controlled; two pipelines are arranged in parallel between the flow distribution valve (10) and the finished product manufacturing device (200), wherein a compensation conveying pump (21) for controlling the flow rate of the melt is arranged in a first pipeline (20), a pressure transmitter (31) for detecting the pressure of the melt and a metering pump (32) for metering the flow rate of the melt are arranged in a second pipeline (30), and the metering pump (32) is arranged at the downstream of the pressure transmitter (31); characterized in that the method comprises the following steps: synchronously delivering a part of the melt delivered by the melt delivery master pump (100) to the finished product manufacturing device (200) and the rest of the melt to the granulating device (300) through at least one flow distribution valve (10); conveying the melt conveyed to the finished product manufacturing device (200) through two pipelines connected in parallel, wherein the melt flow of the compensation conveying pump (21) in the first pipeline (20) is controlled by the pressure of the pressure transmitter (31) in the second pipeline (30); the length of the pipeline between the metering pump (32) and the pressure transmitter (31) is delta L, the difference value between the flow change of the metering pump (32) and the start time of the pressure change of the pressure transmitter (31) is delta t, and the ratio delta L/delta t between the two is used as a gradient value for controlling the compensation of the opening change of the delivery pump (21).
2. The method of claim 1, wherein the amount of melt delivered by the melt delivery manifold (100) is greater than a demand of the end product manufacturing device (200).
3. The method of claim 2, wherein the total flow of the first (20) and second (30) conduits is equal to the required amount of the finished product manufacturing apparatus (200).
4. A melt conveying apparatus for use in the method of one of claims 1 to 3, comprising a melt conveying pump (100), a finished product manufacturing device (200), a granulating device (300) and a flow distribution valve (10); two pipelines are arranged in parallel between the flow distribution valve (10) and the finished product manufacturing device (200), wherein a compensation conveying pump (21) for controlling the flow rate of the melt is arranged in a first pipeline (20), a pressure transmitter (31) for detecting the pressure of the melt and a metering pump (32) for metering the flow rate of the melt are arranged in a second pipeline (30), and the metering pump (32) is arranged at the downstream of the pressure transmitter (31); the device is characterized in that an inlet of the first pipeline (20) is arranged behind the flow distribution valve (10) and before the pressure transmitter (31), and an outlet of the first pipeline (20) is arranged in front of the finished product manufacturing device (200) and behind the flow distribution valve (10).
5. Melt conveying apparatus according to claim 4, characterized in that the outlet of the first pipe (20) is arranged after the metering pump (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111010847.4A CN113681777B (en) | 2021-08-31 | 2021-08-31 | Melt conveying method and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111010847.4A CN113681777B (en) | 2021-08-31 | 2021-08-31 | Melt conveying method and equipment |
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| Publication Number | Publication Date |
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| CN113681777A CN113681777A (en) | 2021-11-23 |
| CN113681777B true CN113681777B (en) | 2023-09-01 |
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| CN202111010847.4A Active CN113681777B (en) | 2021-08-31 | 2021-08-31 | Melt conveying method and equipment |
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| CN120269798B (en) * | 2025-06-05 | 2025-09-12 | 克劳斯玛菲机械(中国)有限公司 | Online modified combined extrusion equipment and extrusion method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109056082A (en) * | 2018-08-20 | 2018-12-21 | 宁波卓成化纤有限公司 | A kind of method for implanting of fused mass directly spinning functionality master batch list position equal and quantitative |
| CN213686236U (en) * | 2020-09-29 | 2021-07-13 | 中石油北京天然气管道有限公司 | A divide defeated controlling means for natural gas |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109056082A (en) * | 2018-08-20 | 2018-12-21 | 宁波卓成化纤有限公司 | A kind of method for implanting of fused mass directly spinning functionality master batch list position equal and quantitative |
| CN213686236U (en) * | 2020-09-29 | 2021-07-13 | 中石油北京天然气管道有限公司 | A divide defeated controlling means for natural gas |
Non-Patent Citations (1)
| Title |
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| "聚酯直接纺和切片熔体的输送及分配";黄克英;《广东化纤技术通讯》;19881230;第30-31页 * |
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