CN113681779B - Synchronous production system and method for multilayer film - Google Patents
Synchronous production system and method for multilayer film Download PDFInfo
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- CN113681779B CN113681779B CN202111011421.0A CN202111011421A CN113681779B CN 113681779 B CN113681779 B CN 113681779B CN 202111011421 A CN202111011421 A CN 202111011421A CN 113681779 B CN113681779 B CN 113681779B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 107
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000000155 melt Substances 0.000 claims abstract description 76
- 238000009826 distribution Methods 0.000 claims abstract description 53
- 230000008859 change Effects 0.000 claims description 17
- 229920000642 polymer Polymers 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 5
- 239000011265 semifinished product Substances 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 8
- 230000002457 bidirectional effect Effects 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 43
- 229920001634 Copolyester Polymers 0.000 description 8
- -1 Polyethylene Polymers 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 229920006267 polyester film Polymers 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 238000012546 transfer Methods 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 3
- 229920006255 plastic film Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002994 raw material Substances 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
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000289 melt material Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 229920005644 polyethylene terephthalate glycol copolymer Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 229920006257 Heat-shrinkable film Polymers 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 238000002834 transmittance Methods 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
-
- 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
- B29C31/10—Feeding of the material to be moulded, e.g. into a mould cavity of several materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Robotics (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
A multi-layer film synchronous production system and method at least comprises a first conveying device for preparing a first mould layer A through a first melt and a second conveying device for preparing a second mould layer B through a second melt, wherein the first conveying device and the second conveying device convey the first melt and the second melt to a multi-layer film manufacturing device respectively to prepare a film forming a multi-layer structure. The flow distribution valve of the first and second conveying apparatuses of the present application simultaneously conveys a part of the conveyed melt to the multilayer film manufacturing apparatus through the pipe and conveys the remaining part of the melt to one of the slicing apparatuses. According to the application, each melt is synchronously conveyed to two directions, so that uninterrupted conveying of the melt is realized. Therefore, melts in two directions can be mutually regulated, when a film making device is stopped due to a problem, redundant melts can be conveyed to a slicing device, so that the purpose of avoiding waste by uninterrupted conveying of the film making melt is realized, and the quality of each film can be ensured by bidirectional regulating conveying.
Description
Technical Field
The application relates to a plastic film production technology in the chemical field, in particular to a multi-layer film synchronous production system and method.
Background
Plastic films are very widely used in industrial and domestic fields. Common plastic films include various films made of thermoplastic polymer compounds such as Polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), polyester film (PET), polypropylene (PP), nylon, etc. The use of multilayer films is also common, depending on the needs and application environment.
For example, CN103203934a discloses a heat-shrinkable copolyester film comprising a surface layer of an a layer consisting essentially of PETG copolyester, a sandwich layer of a B layer consisting of PET/PBT copolyester, and a bottom layer of a C layer consisting of PCTG copolyester. The film with the three-layer structure is prepared by co-extrusion of a PETG copolyester slice for a film, a PCTG copolyester slice for a film and a PET/PBT copolyester slice for a film. Compared with the conventional heat-shrinkable polyester film, the three-layer co-extrusion transverse stretching copolyester heat-shrinkable film in the prior art has the advantages of high light transmittance and unidirectional heat shrinkage, good glossiness, strong stability, uniform shrinkage, excellent transparency, ductility and toughness, and suitability for direct packaging of labels of various containers, food and beverage, electronic and electric appliances, machinery or hardware products.
The prior art discloses a three-layer film, wherein the three-layer film has different components, slices with different components are prepared during preparation, and then the slices are melted and co-extruded to obtain the film with a three-layer structure. The multilayer films of the prior art are generally produced in such a way that, when the semifinished polymer products, for example pellets, beads, granules, etc., are first prepared, the semifinished products are melt-again co-extruded to give the finished multilayer film.
This is done by the prior art because it is difficult to ensure continuity in the process of preparing films directly from one polymer melt, and in the case of multi-layer films of different compositions, it is necessary to ensure continuous delivery of the polymer of each composition, and interruption of the supply of either composition can result in failure of the film. In fact, the film forming process in the prior art often generates melt conveying interruption for various reasons, and can cause blockage caused by solidification in equipment after melt interruption, so that raw materials are wasted slightly, and the equipment is damaged seriously. The semi-finished product slice or granule is adopted, and the feeding can be stopped at any time when the production is interrupted, so that a great amount of raw materials are prevented from being wasted, and the safety of equipment is ensured. However, the remelting of the semi-finished raw materials can lead to partial decomposition of the polymer and poor product quality, and in addition, the production process is divided into two steps of semi-finished and remelting film making, so that the equipment cost is increased, the production efficiency is reduced, and the economic benefit is relatively poor.
Disclosure of Invention
The present application is directed to a system and a method for synchronously producing a multi-layer film, which can reduce or avoid the above-mentioned problems.
In order to solve the technical problem, the application provides a multi-layer film synchronous production system, which at least comprises a first conveying device for preparing a first die layer A through a first melt and a second conveying device for preparing a second die layer B through a second melt, wherein the first conveying device and the second conveying device respectively convey the first melt and the second melt to a multi-layer film manufacturing device to prepare a film forming a multi-layer structure, the first conveying device comprises a first melt conveying total pump and a first flow distribution valve, and the first flow distribution valve synchronously conveys part of the first melt conveyed by the first melt conveying total pump to the multi-layer film manufacturing device through a pipeline and conveys the rest of the first melt to a first cutting device through a pipeline; the second conveying device comprises a second melt conveying total pump and a second flow distribution valve, wherein the second flow distribution valve synchronously conveys part of second melt conveyed by the second melt conveying total pump to the multilayer film manufacturing device through a pipeline and conveys the rest part of second melt to a second slicing device through a pipeline.
Preferably, the amount of the first melt conveyed by the first melt conveying master pump is larger than the required amount of the first mold layer A; the second melt is delivered by the second melt delivery master cylinder in an amount greater than the required amount of the second mold layer B.
Preferably, a first compensation pipe and a first main conveying pipe are arranged in parallel between the first flow distribution valve and the multilayer film manufacturing apparatus, and the melt flow in the first compensation pipe is controlled by the pressure in the first main conveying pipe.
Preferably, a first compensation conveying pump for controlling the flow rate of the melt is arranged in the first compensation pipeline, and a first pressure transmitter for detecting the pressure of the melt is arranged in the first main conveying pipeline; the melt flow of the first compensation delivery pump is controlled by the pressure of the first pressure transmitter.
Preferably, a second compensation pipe and a second main conveying pipe are arranged in parallel between the second flow distribution valve and the multilayer film manufacturing apparatus, and the melt flow in the second compensation pipe is controlled by the pressure in the second main conveying pipe.
Preferably, a second compensation conveying pump for controlling the melt flow rate is arranged in the second compensation pipeline, and a second pressure transmitter for detecting the melt pressure is arranged in the second main conveying pipeline; the melt flow of the second compensation delivery pump is controlled by the pressure of the second pressure transmitter.
Preferably, the inlet of the first compensation pipe is disposed after the first flow distribution valve and before the first pressure transmitter, and the outlet of the first compensation pipe is disposed before the multilayer film manufacturing apparatus and after the first flow distribution valve; the inlet of the second compensation pipe is arranged after the second flow distribution valve and before the second pressure transmitter, and the outlet of the second compensation pipe is arranged before the multilayer film manufacturing device and after the second flow distribution valve.
Preferably, a first metering pump for metering the melt flow is also provided in the first main conveying pipe, the first metering pump being arranged downstream of the first pressure transmitter; the inlet of the first compensation pipe is arranged after the first flow distribution valve and before the first pressure transmitter, and the outlet of the first compensation pipe is arranged before the multilayer film manufacturing device and after the first metering pump.
Preferably, a second metering pump for metering the melt flow is also arranged in the second main conveying pipeline, the second metering pump being arranged downstream of the second pressure transmitter; the inlet of the second compensation pipe is arranged after the second flow distribution valve and before the second pressure transmitter, and the outlet of the second compensation pipe is arranged before the multilayer film manufacturing device and after the second metering pump.
In addition, the application also provides a multilayer film synchronous production method, which comprises the following steps: delivering the first melt for preparing the first mold layer a directly to at least one first flow distribution valve via a first melt delivery manifold; the first flow distributing valve synchronously conveys a part of the first melt to the multilayer film manufacturing device to prepare a first mold layer A, and conveys the rest of the first melt to the first slicing device to prepare slices of the first melt; wherein the first melt delivered to the multilayer film manufacturing apparatus is delivered through a first compensation pipe and a first main delivery pipe connected in parallel, the melt flow in the first compensation pipe being controlled by the pressure in the first main delivery pipe; simultaneously and simultaneously preparing a first mould layer A, and simultaneously conveying a second melt for preparing a second mould layer B to at least one second flow distribution valve directly through a second melt conveying main pump; the second flow distributing valve synchronously conveys a part of the second melt to the multilayer film manufacturing device and conveys the rest of the second melt to the second slicing device; wherein the second melt fed to the multilayer film manufacturing apparatus is fed through a second compensation pipe and a second main feed pipe connected in parallel, the melt flow rate in the second compensation pipe being controlled by the pressure in the second main feed pipe.
According to the application, each melt is synchronously conveyed to two directions, so that uninterrupted conveying of the melt is realized. Therefore, melts in two directions can be mutually regulated, when a film making device is stopped due to a problem, redundant melts can be conveyed to a slicing device, so that the purpose of avoiding waste by uninterrupted conveying of the film making melt is realized, and the quality of each film can be ensured by bidirectional regulating conveying.
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. Wherein,,
FIG. 1 is a schematic diagram showing a multi-layer film simultaneous production system according to an embodiment of the present application;
fig. 2 is a schematic diagram showing the structure of a multi-layered film simultaneous production system 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 simultaneous production system for a multi-layered film as shown in fig. 1, which can be used to continuously feed melts of various polymers including, but not limited to, polyethylene, polyvinyl chloride, polystyrene, polyester film, polypropylene, nylon, and the like, to a multi-layered film manufacturing apparatus to produce a film having a multi-layered structure.
As shown in the drawing, the multi-layered film synchronous production system provided by the present application includes at least a first conveying apparatus 1 for preparing a first mold layer a from a first melt and a second conveying apparatus 2 for preparing a second mold layer B from a second melt, the first and second conveying apparatuses 1 and 2 conveying the first melt from a discharge tank 400 and the second melt from a discharge tank 400', respectively, to a multi-layered film manufacturing device 200 to prepare a film forming a multi-layered structure. In the embodiment shown in fig. 1, the first melt may be directly from the first melt take-off tank 400 of one polymer production system (not shown), the second melt may be directly from the second melt take-off tank 400' of another polymer production system (not shown), the first melt is produced by the multilayer film production apparatus 200 to obtain the first film layer a, and the second melt is produced by the multilayer film production apparatus 200 to obtain the second film layer B, so that films having two or more structures, such as a two-layer film of an AB structure, a three-layer film of an ABA structure, a four-layer film of an ABAB structure, and the like, may be produced by the illustrated multilayer film production apparatus 200. The multilayer film manufacturing apparatus 200 may employ any one of the existing extrusion apparatuses that can be used to produce a multilayer film.
It can be seen that the first conveying means 1 and the second conveying means 2 are identical in structure and each convey one kind of melt to the multilayer film manufacturing apparatus 200, so that it can be easily understood that if more conveying means of the same structure are provided, more kinds of melts can be conveyed to the multilayer film manufacturing apparatus 200, and thus multilayer films of more complex structures can be simultaneously produced.
As shown in the drawing, the first conveying apparatus 1 includes a first melt conveying general pump 100 and a first flow distribution valve 10, and the first flow distribution valve 10 simultaneously conveys a part of the first melt conveyed by the first melt conveying general pump 100 to the multilayer film manufacturing device 200 through a pipe, and conveys the remaining part of the first melt to one first slicing device 300 through a pipe. Likewise, the second transporting apparatus 2 includes a second melt transporting pump 100' and a second flow distributing valve 10', and the second flow distributing valve 10' simultaneously transports a part of the second melt transported by the second melt transporting pump 100' to the multilayer film manufacturing apparatus 200 through a pipe, and transports the remaining part of the second melt to one second slicing apparatus 300' through a pipe.
The application aims to realize synchronous production of the multilayer film, and ensures that melts of two components in the drawing are continuously conveyed to a multilayer film manufacturing device. In the scheme for synchronously producing the multilayer film, each melt is synchronously conveyed in two directions, and when the melt flow in the film-making direction fluctuates, the melt flow in the slicing direction can be regulated and controlled. That is, each melt in the application is continuously conveyed in two directions, so that the melts in the two directions can be mutually regulated, when the film making device stops due to a problem, the redundant melt can be conveyed to the slicing device, so that the purpose of continuously conveying the film making melt to realize synchronous production and avoid waste is realized, and the quality of each film can be ensured through bidirectional regulating and conveying. In summary, in the application, each melt can be continuously conveyed in two directions, so that continuous conveying of each melt is ensured, and synchronous production is further ensured. Generally, the melt slicing process is relatively simple, and the requirements on the particle specification are relatively wide, so that the slicing device generally cannot generate production interruption, and once the production interruption occurs in the film making direction, the melt can be synchronously stopped from being conveyed to the multilayer film making device, the production of the multilayer film is synchronously stopped, and the slicing of two melts is synchronously produced.
That is, in the present application, the amount of the first melt delivered by the first melt delivery master cylinder 100 is larger than the required amount of the first mold layer a; the amount of the second melt delivered by the second melt delivery master pump 100' is greater than the amount of the second mold layer B required, so that the opening of the two flow distribution valves can be flexibly controlled according to the requirements of the multilayer film manufacturing apparatus 200, so that the amounts of the melt delivered to the respective slicing apparatuses are changed to meet the requirements of the film forming direction. Since the slicing direction is a semi-finished polymer product, the melt flow in the slicing direction does not need to be precisely controlled, while the film-forming direction is a finished multilayer film product, and the melt flow in this direction needs to be precisely controlled to obtain a high-quality multilayer film.
In addition, as shown in the drawing, a first compensation pipe 20 and a first main conveying pipe 30 are provided in parallel between the first flow distribution valve 10 and the multilayer film manufacturing apparatus 200, and the melt conveying amount in the first compensation pipe 20 is controlled by the melt pressure in the first main conveying pipe 30. In a specific embodiment, a first compensation feed pump 21 for melt flow control is provided in the first compensation pipe 20, and a first pressure transmitter 31 for detecting the melt pressure is provided in the first main feed pipe 30; the melt flow of the first compensating transfer pump 21 is controlled by the melt pressure detected by the first pressure transducer 31. Likewise, a second compensation pipe 20' and a second main conveying pipe 30' are similarly provided in parallel between the second flow distribution valve 10' and the multilayer film manufacturing apparatus 200, and the melt flow rate in the second compensation pipe 20' is controlled by the pressure in the second main conveying pipe 30 '. In yet another similar embodiment, a second compensation feed pump 21 'for melt flow control is provided in the second compensation conduit 20', and a second pressure transmitter 31 'for detecting melt pressure is provided in the second main feed conduit 30'; the melt flow of the second compensation feed pump 21 'is controlled by the melt pressure detected by the second pressure transducer 31'.
In the melt conveying pipelines of the two conveying devices, two pipelines which are connected in parallel are arranged, wherein the first pipeline is a compensation pipeline, the second pipeline is a main conveying pipeline, and the total flow of the first pipeline and the second pipeline is respectively equal to the required quantity of the corresponding film layers. Normally, the main transfer line will be required to transfer a large portion, e.g. 80%, of the melt, and once the pressure in the compensation line has been measured by the pressure transducer, this means that the transfer in the direction of film formation needs to be reduced, e.g. the melt pressure detected by the pressure transducer controls the amount of melt dispensed by the flow distributing valve, and more melt is transferred in the direction of slicing. However, in this case, a part of the excess melt is already accumulated in the main feed line from the flow distributor valve to the pressure transmitter, which part of the excess melt of the prior art can only be fed downstream. The application is responsible for regulating the melt fluctuation in the downstream direction while burdening the delivery of an additional demand of, for example, 20% by providing a compensating duct, for example, by pumping away a portion of the backlog of excess melt by means of a compensating delivery pump, so that the excess melt is buffer-distributed over a relatively long downstream delivery distance over a period of time. Similarly, when the pressure transmitter measures that the pressure in the main conveying pipeline becomes smaller, the melt distribution amount of the flow distribution valve is controlled by the melt pressure detected by the pressure transmitter, and the melt conveying amount in the slicing direction is reduced. Meanwhile, the conveying capacity of the compensation conveying pump in the compensation pipeline is reduced, so that partial flow lacking in the main conveying pipeline can be partially supplemented in a period of time, and the reduction amplitude of the melt flow 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 the subsequent film making can be improved.
In another embodiment, as shown, the inlet of first compensation conduit 20 is disposed after first flow distribution valve 10 and before first pressure transmitter 31, and the outlet of first compensation conduit 20 is disposed before multilayer film manufacturing apparatus 200 and after first flow distribution valve 10. Similarly, the inlet of the second compensation pipe 20' is disposed after the second flow distribution valve 10', before the second pressure transmitter 31', and the outlet of the second compensation pipe 20' is disposed before the multilayer film manufacturing apparatus 200, after the second flow distribution valve 10 '.
In addition, a first metering pump 32 for metering the melt flow can also be provided in the first main conveying line 30, the first metering pump 32 being arranged downstream of the first pressure transmitter 31. At this time, the inlet of the first compensation pipe 20 is disposed after the first flow distribution valve 10 before the first pressure transmitter 31, and the outlet of the first compensation pipe 20 is disposed before the multilayer film manufacturing apparatus 200 after the first metering pump 32. Likewise, a second metering pump 32 'for metering the melt flow can also be provided in the second main conveying line 30', the second metering pump 32 'being arranged downstream of the second pressure transmitter 31'. Similarly, the inlet of the second compensation conduit 20' is now disposed after said second flow distributing valve 10' before the second pressure transmitter 31', and the outlet of the second compensation conduit 20' is disposed before the multilayer film manufacturing apparatus 200 after the second metering pump 32 '.
In the first and second conveying device, the metering pump in the main conveying line is used as a complementary design to the corresponding pressure transmitter for measuring the actual melt flow in the main conveying line. As previously mentioned, the present application is not limited to the delivery of two melts, and in some cases, melt materials of different compositions may be delivered, for example, when it is desired to use the present application to produce multi-layer films of different gauge compositions, it is desirable to adjust the composition of the different melt materials. The viscosity of the different melts varies and the parameters of the melt flow in the compensation pipe are controlled by the pressure in the main conveying pipe.
Therefore, in the above-described embodiments of the present application, metering pumps are provided in the respective main conveying pipes, for example, in the first conveying apparatus 1, the first pipe length Δl between the first metering pump 32 and the first pressure transmitter 31 is obtained by measurement, and the first difference Δt between the flow rate change of the first metering pump 32 and the start time of the pressure change of the first pressure transmitter 31 is used as the gradient value for controlling the opening degree change of the first compensation conveying pump 21, so that the control problem of the compensation conveying pump in different melt cases can be perfectly solved, and the versatility of the apparatus is improved.
In another specific embodiment, as well, in the second conveying apparatus 2, a second pipe length Δl ' between the second metering pump 32' and the second pressure transmitter 31' is obtained by measurement, and a second difference Δt ' between the flow rate change of the second metering pump 32' and the start time of the pressure change of the second pressure transmitter 31' is obtained as a gradient value for controlling the opening degree change of the second compensation conveying pump 21 '.
For example, when the flow rate of the downstream metering pump changes, the pressure change does not reach the upstream pressure transmitter, the time difference deltat between the two changes represents the time of the melt property transmission change, and the speed of the melt property transmission change can be calculated by the ratio of the length delta L of the pipeline to the time difference deltat, and the speed can be just used for controlling the gradient value for compensating the opening change of the gradually reaching control value of the conveying pump. For example, the pressure change in the main conveying pipeline is measured by the pressure transmitter, the conveying amount of the compensation conveying pump needs to be controlled to reach a certain control value, at this time, the opening of the compensation conveying pump is not adjusted to a required size at a time, but the opening of the compensation conveying pump is gradually adjusted to the required size 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 compensation conveying pump to a relatively long conveying distance at the downstream in a period of time can be obtained.
Fig. 2 is a schematic structural view of a synchronous production system for multi-layered films according to another embodiment of the present application, which at least includes two parallel production lines, namely, an upper production line and a lower production line, which share a first melt discharge tank 400 and a second melt discharge tank 400', and share a first slicing device 300 and a second slicing device 300', respectively.
Specifically, the first melt discharge tank 400 is divided into two paths to be fed to the two first conveying apparatuses 1 connected in parallel, and the second melt discharge tank 400' is also divided into two paths to be fed to the two second conveying apparatuses 2 connected in parallel. As shown in the upper part of fig. 2, the first production line constitutes a melt conveying system by a set of first conveying means 1 and second conveying means 2, and feeds a common one of the multilayer film manufacturing apparatuses 200. Likewise, as shown in the lower part of fig. 2, the second production line constitutes a melt conveying system by another set of the first conveying apparatus 1 and the second conveying apparatus 2, and feeds another multilayer film manufacturing apparatus 200 in common. The advantage of this embodiment is that the melt throughput of the polymer production system can be fully utilized, and as many production lines as possible can be arranged within the melt throughput to increase the throughput of the multilayer film and avoid wasting a large amount of production energy in the production of the semifinished product.
In addition, since the first melt utilized by both lines is the same and the second melt is the same, the present application can provide a common slicing device 300, 300' for both lines, respectively. As shown in the figure, the first flow distribution valve 10 of the first conveying apparatus 1 in the first production line conveys a part of the first melt to the first slicing device 300, and at the same time, the first flow distribution valve 10 of the first conveying apparatus 1 in the second production line can also convey a part of the first melt to the same first slicing device 300, because the first conveying apparatuses of the two production lines convey the first melt, the first slicing device 300 is shared, no pollution is caused, and meanwhile, the investment of equipment can be reduced, and the production cost is saved. Similarly, the second flow distributing valve 10 'of the second conveying apparatus 2 in the first production line conveys a portion of the second melt to the second slicing device 300', and at the same time, the second flow distributing valve 10 'of the second conveying apparatus 2 in the second production line can convey a portion of the second melt to the same second slicing device 300'.
Similarly, the present application may be further extended on the basis of the multi-layer film synchronous production system shown in fig. 2, for example, may include more parallel production lines, each of which may share the first melt discharge tank 400 and the second melt discharge tank 400', and share the first slicing device 300 and the second slicing device 300', respectively. For example, assuming that the yields of the two melts are 130 tons and the consumption of each production line is 20 tons, six production lines can be completely arranged in parallel, and the film forming direction interruption of any one production line can share the first slicing device 300 and the second slicing device 300', so that the normal operation of other production lines is not affected, and only the film forming consumption of the production line needs to be transferred to the slicing direction.
The simultaneous production method of the multilayer film of the present application is further described below with reference to the accompanying drawings. Of course, the simultaneous production process of the multilayer film of the application is actually described in the introduction to the system described above, and is supplemented by a summary of the application in the following.
As shown in the figure, the multi-layer film synchronous production method of the application comprises the following steps: delivering the first melt for preparing the first mold layer a directly through the first melt delivery master pump 100 to the at least one first flow distribution valve 10; the first flow distribution valve 10 simultaneously delivers a portion of the first melt to the multilayer film manufacturing apparatus 200 to prepare the first mold layer a, and delivers the remaining portion of the first melt to the first slicing apparatus 300 to prepare slices of the first melt. In one embodiment, the first melt fed to the multilayer film manufacturing apparatus 200 may be fed through the first compensating conduit 20 and the first main conveying conduit 30 in parallel, with the flow rate of the melt in the first compensating conduit 20 being controlled by the pressure in the first main conveying conduit 30. Likewise, simultaneously with the preparation of the first mold layer a, the second melt for the preparation of the second mold layer B is simultaneously fed directly via the second melt feed pump 100 'to the at least one second flow distribution valve 10'; the second flow distribution valve 10 'simultaneously conveys a part of the second melt to the multilayer film manufacturing apparatus 200 and conveys the remaining part of the second melt to the second slicing apparatus 300'. In another embodiment, the second melt fed to the multilayer film manufacturing apparatus 200 is fed through the second compensating conduit 20 'and the second main conveying conduit 30' in parallel, and the flow rate of the melt in the second compensating conduit 20 'is controlled by the pressure in the second main conveying conduit 30'.
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 multilayer film synchronous production method for a multilayer film synchronous production system comprising at least a first conveying apparatus (1) for producing a first mold layer a from a first melt and a second conveying apparatus (2) for producing a second mold layer B from a second melt, the first conveying apparatus (1) and the second conveying apparatus (2) conveying the first melt and the second melt, respectively, to a multilayer film producing device (200) to produce a film forming a multilayer structure, the first conveying apparatus (1) comprising a first melt conveying pump (100) and a first flow distribution valve (10), the first flow distribution valve (10) simultaneously conveying a portion of the first melt conveyed by the first melt conveying pump (100) to the multilayer film producing device (200) through a pipe, and conveying the remaining portion of the first melt to a first cutting device (300) through a pipe; the second conveying device (2) comprises a second melt conveying total pump (100 ') and a second flow distribution valve (10 '), wherein the second flow distribution valve (10 ') synchronously conveys a part of the second melt conveyed by the second melt conveying total pump (100 ') to the multilayer film manufacturing device (200) through a pipeline and conveys the rest of the second melt to a second slicing device (300 ') through a pipeline;
wherein the first slicing device (300) and the second slicing device (300') obtain semi-finished products of polymer, the melt flow of which does not need to be precisely controlled; the multilayer film manufacturing apparatus (200) obtains a finished multilayer film whose melt flow rate needs to be precisely controlled;
a first compensation pipeline (20) and a first main conveying pipeline (30) are arranged in parallel between the first flow distribution valve (10) and the multilayer film manufacturing device (200); a first compensation conveying pump (21) for controlling the flow rate of the melt is arranged in the first compensation pipeline (20), and a first pressure transmitter (31) for detecting the pressure of the melt and a first metering pump (32) for metering the flow rate of the melt are arranged in the first main conveying pipeline (30); the first metering pump (32) is arranged downstream of the first pressure transmitter (31);
a second compensation pipeline (20 ') and a second main conveying pipeline (30 ') are arranged in parallel between the second flow distribution valve (10 ') and the multilayer film manufacturing device (200); a second compensation delivery pump (21 ') for controlling the flow rate of the melt is arranged in the second compensation pipeline (20 '), and a second pressure transmitter (31 ') for detecting the pressure of the melt and a second metering pump (32 ') for metering the flow rate of the melt are arranged in the second main delivery pipeline (30 '); the second metering pump (32 ') is arranged downstream of the second pressure transmitter (31');
characterized in that the method comprises the following steps:
delivering the first melt for producing the first mold layer a directly to at least one first flow distribution valve (10) via a first melt delivery pump (100); a first flow distribution valve (10) simultaneously delivers a portion of the first melt to the multilayer film manufacturing apparatus (200) to produce a first mold layer a, and delivers the remaining portion of the first melt to the first slicing apparatus (300) to produce slices of the first melt; wherein the first melt fed to the multilayer film manufacturing apparatus (200) is fed through a first compensation pipe (20) and a first main feed pipe (30) connected in parallel, the melt flow rate of a first compensation feed pump (21) in the first compensation pipe (20) being controlled by the pressure of a first pressure transmitter (31) in the first main feed pipe (30); wherein the first pipe length between the first metering pump (32) and the first pressure transmitter (31) is delta L, the first difference between the flow rate change of the first metering pump (32) and the start time of the pressure change of the first 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 opening degree change of the first compensation delivery pump (21);
simultaneously with the preparation of the first mould layer a, simultaneously delivering the second melt for the preparation of the second mould layer B directly to the at least one second flow distribution valve (10 ') via a second melt delivery pump (100'); a second flow distribution valve (10 ') simultaneously delivering a portion of the second melt to the multilayer film manufacturing apparatus (200) and delivering the remaining portion of the second melt to a second slicing apparatus (300'); wherein the second melt fed to the multilayer film manufacturing apparatus (200) is fed through a second compensation pipe (20 ') and a second main feed pipe (30') connected in parallel, the melt flow rate of a second compensation feed pump (21 ') in the second compensation pipe (20') being controlled by the pressure of a second pressure transmitter (31 ') in the second main feed pipe (30'); wherein the second pipe length between the second metering pump (32 ') and the second pressure transmitter (31 ') is DeltaL ', the second difference between the flow rate change of the second metering pump (32 ') and the start time of the pressure change of the second pressure transmitter (31 ') is Deltat ', and the ratio DeltaL '/Deltat ' between the two is used as a gradient value for controlling the opening degree change of the second compensation delivery pump (21 ').
2. The method of claim 1, wherein the first melt is delivered by the first melt delivery manifold (100) in an amount greater than the first mold layer a demand; the second melt delivery pump (100') delivers a second amount of melt greater than the second mold layer B demand.
3. A simultaneous production system for a multilayer film according to the method of claim 1 or 2, comprising at least a first conveying apparatus (1) for producing a first mold layer a from a first melt and a second conveying apparatus (2) for producing a second mold layer B from a second melt, the first conveying apparatus (1) and the second conveying apparatus (2) conveying the first melt and the second melt, respectively, to a multilayer film production device (200) to produce a film forming a multilayer structure, the first conveying apparatus (1) comprising a first melt conveying pump (100) and a first flow distribution valve (10), the first flow distribution valve (10) simultaneously conveying a portion of the first melt conveyed by the first melt conveying pump (100) to the multilayer film production device (200) through a pipe and conveying the remaining portion of the first melt to one first cutting device (300) through a pipe; the second conveying device (2) comprises a second melt conveying total pump (100 ') and a second flow distribution valve (10 '), wherein the second flow distribution valve (10 ') synchronously conveys a part of the second melt conveyed by the second melt conveying total pump (100 ') to the multilayer film manufacturing device (200) through a pipeline and conveys the rest of the second melt to a second slicing device (300 ') through a pipeline;
a first compensation pipeline (20) and a first main conveying pipeline (30) are arranged in parallel between the first flow distribution valve (10) and the multilayer film manufacturing device (200); a first compensation conveying pump (21) for controlling the flow rate of the melt is arranged in the first compensation pipeline (20), and a first pressure transmitter (31) for detecting the pressure of the melt and a first metering pump (32) for metering the flow rate of the melt are arranged in the first main conveying pipeline (30); the first metering pump (32) is arranged downstream of the first pressure transmitter (31);
a second compensation pipeline (20 ') and a second main conveying pipeline (30 ') are arranged in parallel between the second flow distribution valve (10 ') and the multilayer film manufacturing device (200); a second compensation delivery pump (21 ') for controlling the flow rate of the melt is arranged in the second compensation pipeline (20 '), and a second pressure transmitter (31 ') for detecting the pressure of the melt and a second metering pump (32 ') for metering the flow rate of the melt are arranged in the second main delivery pipeline (30 '); the second metering pump (32 ') is arranged downstream of the second pressure transmitter (31');
characterized in that the inlet of the first compensation pipe (20) is arranged after the first flow distribution valve (10) and before the first pressure transmitter (31), and the outlet of the first compensation pipe (20) is arranged before the multilayer film manufacturing device (200) and after the first flow distribution valve (10); the inlet of the second compensation pipe (20 ') is arranged after the second flow distribution valve (10 ') and before the second pressure transmitter (31 '), and the outlet of the second compensation pipe (20 ') is arranged before the multilayer film manufacturing apparatus (200) and after the second flow distribution valve (10 ').
4. A synchronous production system for multilayer films according to claim 3, characterized in that the outlet of the first compensation conduit (20) is arranged after the first metering pump (32).
5. A synchronous production system for multilayer films according to claim 3, characterized in that the outlet of the second compensation conduit (20 ') is arranged after the second metering pump (32').
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