CN113681779A - Synchronous production system and method for multilayer film - Google Patents
Synchronous production system and method for multilayer film Download PDFInfo
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- CN113681779A CN113681779A CN202111011421.0A CN202111011421A CN113681779A CN 113681779 A CN113681779 A CN 113681779A CN 202111011421 A CN202111011421 A CN 202111011421A CN 113681779 A CN113681779 A CN 113681779A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 113
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title abstract description 8
- 239000000155 melt Substances 0.000 claims abstract description 66
- 238000009826 distribution Methods 0.000 claims abstract description 58
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000002457 bidirectional effect Effects 0.000 abstract description 2
- 239000010408 film Substances 0.000 abstract 6
- 239000010409 thin film Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 43
- 230000008859 change Effects 0.000 description 9
- 229920000642 polymer Polymers 0.000 description 9
- 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
- 239000011265 semifinished product Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
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- 230000001276 controlling effect Effects 0.000 description 3
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- 229920006255 plastic film Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
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- 239000004677 Nylon Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
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- 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
- 238000012546 transfer Methods 0.000 description 2
- 229920006257 Heat-shrinkable film Polymers 0.000 description 1
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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
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- 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 a method thereof at least comprise a first conveying device for preparing a first mold layer A through a first melt and a second conveying device for preparing a second mold 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 multi-layer structure forming thin film. The flow distribution valve of the first and second conveying devices of the present application synchronously conveys one part of the conveyed melt to the multilayer film manufacturing device through the pipeline and conveys the rest part of the melt to one slicing device. This application has realized the incessant transport of fuse-element through carrying each kind of fuse-element to two directions in step. Therefore, the melts in the two directions can be adjusted mutually, when the film making device is out of order and stops, the redundant melts can be conveyed to the slicing device, so that the purpose of avoiding waste due to the fact that the films are continuously conveyed is achieved, and the quality of each layer of film can be guaranteed through bidirectional adjustment conveying.
Description
Technical Field
The application relates to a plastic film production technology in the field of chemical engineering, in particular to a system and a method for synchronously producing multilayer films.
Background
The plastic film is widely applied in the industrial and living fields. Common plastic films include various films prepared from thermoplastic high molecular compounds such as Polyethylene (PE), polyvinyl chloride (PVC), Polystyrene (PS), polyester film (PET), polypropylene (PP), nylon, and the like. The use of multilayer films is also common depending on the requirements and the application environment.
For example, CN103203934A discloses a heat-shrinkable copolyester film, which comprises an a-layer surface layer mainly composed of PETG copolyester, a B-layer sandwich layer composed of PET/PBT copolyester, and a C-layer bottom layer composed of PCTG copolyester. The film with the three-layer structure is prepared by co-extruding PETG copolyester chips for films, PCTG copolyester chips for films and PET/PBT copolyester chips for films. Compared with the conventional heat-shrinkable polyester film, the three-layer co-extrusion transverse stretching copolyester heat-shrinkable film in the prior art has high light transmittance and unidirectional heat shrinkage, good glossiness, strong stability, uniform shrinkage, excellent transparency, ductility and toughness, and is suitable for direct packaging of labels of various containers, food and beverage, electronic and electrical products, machinery or hardware products.
The prior art discloses a three-layer film, the components of the three-layer film are different, when in preparation, slices with different components are prepared firstly, and then the slices are melted and co-extruded to obtain the three-layer structure film. Multilayer films of the prior art are usually produced in such a way that polymer semi-finished products, such as chips, pellets, granules, etc., are prepared first, and when the multilayer film is prepared in the main, the semi-finished products are re-melt co-extruded to obtain the finished multilayer film.
This is done by the manufacturers since it is difficult to ensure continuity in the process of directly preparing a film from a polymer melt, and if a multilayer film with different compositions is used, continuous transport of the polymer of each composition is required, and failure of film formation due to interruption of supply of any one composition is caused. In fact, the film-making process of the prior art often has melt conveying interruption due to various reasons, and the melt is solidified in equipment after being cut off to cause blockage, so that raw materials are wasted, and the equipment is damaged. And the semi-finished chips or granules are adopted, so that the feeding can be stopped at any time when the production is interrupted, the waste of a large amount of raw materials can be avoided, and the safety of equipment can be ensured. But the remelting of the raw materials of the semi-finished product can cause partial decomposition of the polymer, thus causing poor product quality, and in addition, the production process is divided into two steps of semi-finished product and remelting film making, thereby not only increasing the equipment cost, but also reducing the production efficiency, and having relatively poor economic benefit.
Disclosure of Invention
The present application is directed to a system and method for synchronously producing multiple layers of films, which reduces or avoids the above-mentioned problems.
In order to solve the technical problems, the application provides a multilayer film synchronous production system, which at least comprises a first conveying device and a second conveying device, wherein the first conveying device is used for preparing a first mold layer A through a first melt, the second conveying device is used for preparing a second mold layer B through a second melt, the first conveying device and the second conveying device convey the first melt and the second melt respectively to a multilayer film manufacturing device to prepare a film forming a multilayer structure, the first conveying device comprises a first melt conveying main pump and a first flow distribution valve, and the first flow distribution valve synchronously conveys one part of the first melt conveyed by the first melt conveying main pump to the multilayer film manufacturing device through a pipeline and conveys the rest part of the first melt to a first slicing device through a pipeline; the second conveying device comprises a second melt conveying main pump and a second flow distribution valve, and the second flow distribution valve synchronously conveys one part of the second melt conveyed by the second melt conveying main pump to the multilayer film manufacturing device through a pipeline and conveys the rest part of the second melt to a second slicing device through a pipeline.
Preferably, the first melt conveying main pump conveys the first melt in an amount larger than the required amount of the first die layer A; the second melt conveying main pump conveys the second melt in an amount larger than the required amount of the second die layer B.
Preferably, a first compensation pipe and a first main conveying pipe are arranged between the first flow distribution valve and the multilayer film manufacturing device in parallel, and the melt flow in the first compensation pipe is controlled by the pressure in the first main conveying pipe.
Preferably, a first compensation delivery pump for melt flow control is arranged in the first compensation pipeline, and a first pressure transmitter for detecting melt pressure is arranged in the first main delivery 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 between the second flow distribution valve and the multilayer film manufacturing device in parallel, and the melt flow in the second compensation pipe is controlled by the pressure in the second main conveying pipe.
Preferably, a second compensation delivery pump for melt flow control is arranged in the second compensation pipeline, and a second pressure transmitter for detecting melt pressure is arranged in the second main delivery 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 further arranged in the first main conveying pipeline, and the first metering pump is arranged at the downstream of the first pressure transmitter; an inlet of the first compensation pipe is disposed after the first flow distribution valve and before the first pressure transmitter, and an outlet of the first compensation pipe is disposed before the multilayer film manufacturing apparatus and after the first metering pump.
Preferably, a second metering pump for metering the melt flow is further arranged in the second main conveying pipeline, and the second metering pump is arranged at the downstream of the second pressure transmitter; an inlet of the second compensation pipe is disposed after the second flow distribution valve and before the second pressure transmitter, and an outlet of the second compensation pipe is disposed before the multilayer film manufacturing apparatus and after the second metering pump.
In addition, the application also provides a synchronous production method of the multilayer film, which comprises the following steps: directly conveying a first melt for preparing a first mold layer A to at least one first flow distribution valve through a first melt conveying main pump; a first flow distribution valve synchronously conveys one part of the first melt to the multilayer film manufacturing device to prepare a first mold layer A and conveys the rest part of the first melt to the first slicing device to prepare slices of the first melt; wherein the first melt to be conveyed to the multilayer film manufacturing device is conveyed through a first compensation pipeline and a first main conveying pipeline which are connected in parallel, and the melt flow in the first compensation pipeline is controlled by the pressure in the first main conveying pipeline; simultaneously conveying a second melt for preparing a second mold layer B directly to at least one second flow distribution valve through a second melt conveying general pump while preparing the first mold layer A; a second flow distribution valve synchronously conveys one part of the second melt to the multilayer film manufacturing device and conveys the rest part of the second melt to a second slicing device; wherein the second melt to be delivered to the multilayer film production device is delivered through a second compensation pipe and a second main delivery pipe connected in parallel, the melt flow in the second compensation pipe being controlled by the pressure in the second main delivery pipe.
This application has realized the incessant transport of fuse-element through carrying each kind of fuse-element to two directions in step. Therefore, the melts in the two directions can be adjusted mutually, when the film making device is out of order and stops, the redundant melts can be conveyed to the slicing device, so that the purpose of avoiding waste due to the fact that the films are continuously conveyed is achieved, and the quality of each layer of film can be guaranteed through bidirectional adjustment conveying.
Drawings
The drawings are only for purposes of illustrating and explaining the present application and are not to be construed as limiting the scope of the present application. Wherein,
FIG. 1 shows a schematic block diagram of a multi-layer film in-line production system according to an embodiment of the present application;
fig. 2 is a schematic diagram showing a multi-layer film synchronous production system according to another embodiment of the present application.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present application, embodiments of the present application will now be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.
The present application provides a multi-layer film synchronous production system as shown in fig. 1, which can be used to continuously deliver melts of various polymers including, but not limited to, polyethylene, polyvinyl chloride, polystyrene, polyester film, polypropylene, nylon, etc. to a multi-layer film manufacturing apparatus to prepare a film having a multi-layer structure.
As shown in the drawing, the present application provides a multi-layer film simultaneous production system including 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 conveying apparatus 1 and the second conveying apparatus 2 conveying the first melt from a discharge tank 400 and the second melt from a discharge tank 400' to a multi-layer film manufacturing apparatus 200, respectively, to prepare a multi-layer film forming a multi-layer structure. In the embodiment shown in fig. 1, the first melt may be directly from a discharge tank 400 of a first melt of one polymer production system (not shown), the second melt may be directly from a discharge tank 400' of a second melt of another polymer production system (not shown), the first melt is prepared by the multilayer film manufacturing apparatus 200 to obtain the first film layer a, and the second melt is prepared by the multilayer film manufacturing apparatus 200 to obtain the second film layer B, so that two or more films of structure, such as a two-layer film of AB structure, a three-layer film of ABA structure, a four-layer film of ABAB structure, and so on, can be prepared by the multilayer film manufacturing apparatus 200 shown. The multilayer film manufacturing apparatus 200 may employ any existing extrusion apparatus that can be used to produce multilayer films.
As can be seen, the first conveying device 1 and the second conveying device 2 are identical in structure, and each conveys one kind of melt to the multilayer film manufacturing apparatus 200, so it can be easily understood that if more conveying devices 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 complicated structures can be simultaneously produced.
As shown, the first conveying apparatus 1 includes a first melt conveying main 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 main pump 100 to the multilayer film manufacturing apparatus 200 through a pipe and conveys the remaining part of the first melt to one first slicing apparatus 300 through a pipe. Likewise, the second conveying device 2 comprises a second melt conveying general pump 100' and a second flow distribution valve 10', and the second flow distribution valve 10' synchronously conveys one part of the second melt conveyed by the second melt conveying general pump 100' to the multilayer film manufacturing device 200 through a pipeline and conveys the rest part of the second melt to a second slicing device 300' through a pipeline.
In order to realize synchronous production of multilayer films, the melt of two components shown in the figure needs to be ensured to be uninterruptedly conveyed to a multilayer film manufacturing device. In the multilayer film synchronous production scheme, each melt is synchronously conveyed to two directions, and when the melt flow in the film making direction fluctuates, the melt flow in the slicing direction can be increased or decreased. That is to say, each fuse-element in this application all is in two directions incessant transport, therefore the fuse-element of two directions can adjust the agent each other, when the film making device takes place the problem and shuts down, and the section device can be carried to unnecessary fuse-element to thereby realize that the incessant transport of film making fuse-element can synchronous production avoid extravagant purpose, and can also guarantee the quality of each rete through two-way adjusting the agent transport. In summary, in the present application, each melt can be continuously conveyed in two directions, which ensures continuous conveyance of each melt and thus synchronous production. Generally, the melt slicing process is relatively simple, and the requirement on the particle specification is relatively wide, so that the slicing device generally does not have the condition of 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 manufacturing device, the production of the multilayer film can be synchronously stopped, and then the slicing of the two melts can be synchronously produced.
That is, in the present application, the first melt delivery master pump 100 delivers the first melt in an amount greater 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 required amount of the second mold layer B, so that the opening degrees of the two flow distribution valves can be flexibly controlled according to the requirements of the multilayer film manufacturing device 200, and the melt amount delivered to each slicing device is changed to meet the requirements of the film forming direction. Since the slicing direction is used to obtain a semi-finished product of the polymer, the melt flow rate in the slicing direction does not need to be accurately controlled, and the film-making direction is used to obtain a finished product of the multilayer film, the melt flow rate in the direction needs to be accurately controlled to obtain a high-quality multilayer film.
In addition, as shown in the drawing, a first compensation pipe 20 and a first main delivery pipe 30 are provided in parallel between the first flow distribution valve 10 and the multilayer film manufacturing apparatus 200, and the melt delivery amount in the first compensation pipe 20 is controlled by the melt pressure in the first main delivery pipe 30. In a specific embodiment, a first compensating delivery pump 21 for melt flow control is arranged in the first compensating pipe 20, and a first pressure transmitter 31 for detecting the melt pressure is arranged in the first main delivery pipe 30; the melt flow of the first compensated feed pump 21 is controlled by the melt pressure detected by the first pressure transmitter 31. Similarly, a second compensation pipe 20' and a second main delivery pipe 30' are provided in parallel between the second flow distribution valve 10' and the multilayer film production apparatus 200, and the flow rate of the melt in the second compensation pipe 20' is controlled by the pressure in the second main delivery pipe 30 '. In yet another similar embodiment, a second compensating delivery pump 21 'for melt flow control is provided in the second compensating pipe 20', and a second pressure transmitter 31 'for detecting the melt pressure is provided in the second main delivery pipe 30'; the melt flow of the second compensated 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 connected in parallel are arranged, 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 total flow of the second pipeline are respectively equal to the required amount of the corresponding film layers. Normally, the main conveying pipe conveys most of the required melt, for example, 80% of the required melt, and once the pressure in the compensating pipe is increased as measured by the pressure transmitter, the conveying amount in the film-making direction needs to be reduced, for example, the melt distribution amount of the flow distribution valve is controlled by the melt pressure detected by the pressure transmitter, so that more melt is conveyed in the slicing direction. However, in this case, a part of the excess melt is already accumulated in the main conveying pipe from the flow distributing valve to the pressure transmitter, and the part of the excess melt can only be conveyed downstream in the prior art. The present application, by providing a compensating duct, while taking up an additional delivery of, for example, 20% of the demand, is responsible for regulating the melt fluctuations in the downstream direction, for example by pumping off a portion of the excess melt that has been accumulated by the compensating delivery pump, so that the excess melt is distributed in a buffer over a relatively long downstream delivery distance over a period of time. Similarly, when the pressure transmitter detects that the pressure in the main conveying pipeline is reduced, 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. And meanwhile, the conveying capacity of the compensation conveying pump in the compensation pipeline is reduced, so that the part of flow rate lacking in the main conveying pipeline can be partially supplemented within a period of time, and the melt flow rate reduction amplitude in the downstream direction can be reduced. The two pipelines are connected in parallel, melt conveying fluctuation cannot be absolutely removed, but fluctuation can be balanced as far as possible, and therefore the quality of subsequent film making can be improved.
In another embodiment, as shown, the inlet of the first compensation pipe 20 is disposed after the first flow distribution valve 10 and before the first pressure transmitter 31, and the outlet of the first compensation pipe 20 is disposed before the multilayer film manufacturing apparatus 200 and after the first flow distribution valve 10. Likewise, the inlet of the second compensation pipe 20' is disposed after the second flow distribution valve 10' and before the second pressure transmitter 31', and the outlet of the second compensation pipe 20' is disposed before the multilayer film manufacturing apparatus 200 and after the second flow distribution valve 10 '.
In addition, a first metering pump 32 for metering the melt flow can also be arranged in the first main conveying pipe 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 rate distribution valve 10 and before the first pressure transmitter 31, and the outlet of the first compensation pipe 20 is disposed before the multilayer film manufacturing apparatus 200 and after the first metering pump 32. Likewise, a second metering pump 32 'for metering the melt flow can also be arranged in the second main conveying pipe 30', the second metering pump 32 'being arranged downstream of the second pressure transmitter 31'. Similarly, in this case, the inlet of the second compensation pipe 20' is disposed after the second flow distribution valve 10' and before the second pressure transmitter 31', and the outlet of the second compensation pipe 20' is disposed before the multilayer film production apparatus 200 and after the second metering pump 32 '.
In the first conveying device and the second conveying device, the metering pump in the main conveying pipeline is used as a supplement design of the corresponding pressure transmitter and is used for measuring the actual melt flow in the main conveying pipeline. As mentioned above, the present application is not limited to the delivery of two melts, and in some cases, melt materials with different compositions can be delivered, for example, when a multilayer film with different specifications and compositions needs to be prepared by the present application, the compositions of the different melt materials need to be adjusted. The viscosity of the different melts is different, and the parameters of the melt flow in the compensation pipe are changed through the pressure control in the main conveying pipe.
Therefore, in the above embodiment of the present application, a metering pump is further disposed in each main conveying pipeline, for example, in the first conveying apparatus 1, the first pipeline length Δ L between the first metering pump 32 and the first pressure transmitter 31, the first difference Δ t 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, and the ratio Δ L/Δ t therebetween are obtained by measurement as a gradient value for controlling the opening change of the first compensation conveying pump 21, so that the control problem of the compensation conveying pump under different melt conditions can be perfectly solved, and the universality of the apparatus is improved.
In another embodiment, likewise, in the second delivery device 2, the second pipe length Δ L ' between the second metering pump 32' and the second pressure transmitter 31' is obtained by measurement, and the second difference Δ t ' between the flow rate variation of the second metering pump 32' and the start time of the pressure variation of the second pressure transmitter 31' is obtained as a gradient value for controlling the opening variation of the second compensation delivery 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 Δ t of the start of the change represents the time of the melt property transfer change, and the speed of the melt property transfer change can be calculated by the ratio of the length Δ L of the pipeline to the time difference Δ t, and can be just used for controlling the gradient value of the opening change for compensating the gradual reaching of the control value of the delivery pump. For example, the pressure change in the main conveying pipeline is measured by the pressure transmitter, the conveying capacity of the compensating conveying pump needs to be controlled to reach a certain control value, at this moment, the opening degree of the compensating conveying pump is not adjusted to a required size at a time, but the opening degree of the compensating conveying pump is gradually adjusted to the required size from zero by taking the value of delta L/delta t as a gradient value for adjusting the opening degree, so that the technical effect of distributing the buffer to a relatively long section of conveying distance at the downstream in a period of time can be obtained.
Fig. 2 is a schematic structural view of a multilayer film synchronous production system according to another embodiment of the present application, which shows that the multilayer film synchronous production system of this embodiment at least includes an upper production line and a lower production line connected in parallel, and the two production lines share a discharge tank 400 for a first melt and a discharge tank 400 'for a second melt and share a first slicing device 300 and a second slicing device 300', respectively.
In particular, the outlet tank 400 for the first melt is branched off in two to two first conveying devices 1 connected in parallel, and the outlet tank 400' for the second melt is also branched off in two to two second conveying devices 2 connected in parallel. As shown in the upper part of fig. 2, the first line is constituted by a melt transport system constituted by a group of first transport means 1 and second transport means 2, and supplies a common multilayer film production apparatus 200. Similarly, as shown in the lower part of fig. 2, the second production line has a melt transport system constituted by another set of first transport means 1 and second transport means 2, and supplies another multilayer film production apparatus 200 in common. The advantage of this embodiment is that the melt capacity of the polymer production system can be fully utilized, and more production lines can be arranged within the melt output range as much as possible, so as to increase the output of the multilayer film and avoid the waste of a large amount of capacity on the production of the semi-finished product.
In addition, since the first melt and the second melt used in both lines are the same, the present application may provide a common slicing apparatus 300, 300' for the same melt in both lines. As shown in the figure, the first flow distribution valve 10 of the first conveying device 1 in the first production line can convey 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 device 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 devices of the two production lines convey the first melt, so that the first slicing device 300 can not be polluted when the first slicing device 300 is shared, and the investment of the equipment can be reduced, thereby saving the production cost. Similarly, the second flow distribution valve 10 'of the second conveying device 2 of the first production line can convey a portion of the second melt to the second slicing apparatus 300', and the second flow distribution valve 10 'of the second conveying device 2 of the second production line can likewise convey a portion of the second melt to the same second slicing apparatus 300'.
Similarly, the present application may be further extended to the multi-layer film synchronous production system shown in fig. 2, for example, more parallel production lines may be included, each of which may share the discharge tank 400 for the first melt and the discharge tank 400 'for the second melt, and share the first slicing apparatus 300 and the second slicing apparatus 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, the six production lines can share the first slicing device 300 and the second slicing device 300', the normal operation of other production lines is not affected by the interruption of the film-making direction of any one production line, and only the film-making consumption of the production line needs to be transferred to the slicing direction.
The multilayer film simultaneous production method of the present application is further described below with reference to the drawings. Of course, the simultaneous production of multilayer films of the present application is actually described in the above-mentioned introduction to the system in an inclusion manner, which is supplemented by the summary of the present application in the following general form.
As shown in the figure, the synchronous production method of the multilayer film comprises the following steps: the first melt for producing the first mold layer a is fed directly via a first melt feed pump 100 to 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 a particular embodiment, the first melt delivered to the multilayer film manufacturing apparatus 200 can be delivered through a first compensation pipe 20 and a first main delivery pipe 30 connected in parallel, the melt flow in the first compensation pipe 20 being controlled by the pressure in the first main delivery pipe 30. Likewise, simultaneously with the preparation of the first mold layer a, a second melt for the preparation of the second mold layer B is simultaneously fed directly by a second melt feed pump 100 'to at least one second flow distribution valve 10'; the second flow distribution valve 10 'simultaneously delivers a portion of the second melt to the multilayer film manufacturing apparatus 200 and the remaining portion of the second melt to the second slicing apparatus 300'. In another embodiment, the second melt delivered to the multilayer film manufacturing apparatus 200 is delivered through a second compensation pipe 20 'and a second main delivery pipe 30' connected in parallel, the flow rate of the melt in the second compensation pipe 20 'being controlled by the pressure in the second main delivery pipe 30'.
It should be appreciated by those skilled in the art that while the present application is described in terms of several embodiments, not every embodiment includes only a single embodiment. The description is thus given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including all technical equivalents which are encompassed by the claims and are to be interpreted as combined with each other in a different embodiment so as to cover the scope of the present application.
The above description is only illustrative of the present invention and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of this application shall fall within the scope of this application.
Claims (10)
1. 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 manufacturing apparatus (200) to produce a film forming a multilayer structure,
the first conveying device (1) comprises a first melt conveying general pump (100) and a first flow distribution valve (10), wherein the first flow distribution valve (10) synchronously conveys one part of the first melt conveyed by the first melt conveying general pump (100) to the multilayer film manufacturing device (200) through a pipeline and conveys the rest part of the first melt to a first slicing device (300) through a pipeline;
the second conveying device (2) comprises a second melt conveying general pump (100') and a second flow distribution valve (10'), wherein the second flow distribution valve (10') synchronously conveys one part of the second melt conveyed by the second melt conveying general pump (100') to the multilayer film manufacturing device (200) through a pipeline and conveys the rest part of the second melt to a second slicing device (300') through a pipeline.
2. The system for the simultaneous production of multilayer films according to claim 1, wherein the first melt delivery pump (100) delivers a first melt in an amount greater than the demand for the first mold layer a; the second melt conveying master pump (100') conveys the second melt in an amount larger than the required amount of the second die layer B.
3. The system for the simultaneous production of multilayer films according to claim 1, wherein a first compensation pipe (20) and a first main transport pipe (30) are arranged in parallel between the first flow distribution valve (10) and the multilayer film production apparatus (200), and the melt flow rate in the first compensation pipe (20) is controlled by the pressure in the first main transport pipe (30).
4. The system for the simultaneous production of multilayer films according to claim 3, characterized in that a first compensation delivery pump (21) for melt flow control is arranged in the first compensation pipe (20), and a first pressure transmitter (31) for detecting the melt pressure is arranged in the first main delivery pipe (30); the melt flow of the first compensating delivery pump (21) is controlled by the pressure of the first pressure transmitter (31).
5. The system for the simultaneous production of multilayer films according to claim 3 or 4, characterized in that a second compensation duct (20') and a second main transport duct (30') are arranged in parallel between the second flow distribution valve (10') and the multilayer film production apparatus (200), the melt flow in the second compensation duct (20') being controlled by the pressure in the second main transport duct (30 ').
6. The system for the simultaneous production of multilayer films according to claim 5, characterized in that a second compensation delivery pump (21') for melt flow control is provided in the second compensation duct (20'), and a second pressure transmitter (31') for detecting the melt pressure is provided in the second main delivery duct (30'); the melt flow of the second compensating delivery pump (21') is controlled by the pressure of the second pressure transmitter (31').
7. The multilayer film synchronous production system according to claim 6, wherein an inlet of the first compensation pipe (20) is provided after the first flow distribution valve (10) and before the first pressure transmitter (31), and an outlet of the first compensation pipe (20) is provided before the multilayer film manufacturing apparatus (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 production device (200) and after the second flow distribution valve (10 ').
8. The system for the simultaneous production of multilayer films according to claim 7, characterized in that a first metering pump (32) for metering the melt flow is also arranged in the first main conveying duct (30), the first metering pump (32) being arranged downstream of the first pressure transmitter (31); an inlet of the first compensation pipe (20) is disposed after the first flow rate distribution valve (10) and before the first pressure transmitter (31), and an outlet of the first compensation pipe (20) is disposed before the multilayer film production apparatus (200) and after the first metering pump (32).
9. The system for the simultaneous production of multilayer films according to claim 8, characterized in that a second metering pump (32') for metering the melt flow is also arranged in the second main conveying duct (30'), the second metering pump (32') being arranged downstream of the second pressure transmitter (31'); the inlet of the second compensation pipe (20') is disposed after the second flow distribution valve (10') and before the second pressure transmitter (31'), and the outlet of the second compensation pipe (20') is disposed before the multilayer film production apparatus (200) and after the second metering pump (32 ').
10. A synchronous production method of multilayer films comprises the following steps: feeding a first melt for producing a first mold layer A directly via a first melt feed pump (100) to at least one first flow distribution valve (10); a first flow distribution valve (10) synchronously conveys a part of the first melt to a multilayer film manufacturing device (200) to prepare a first film layer A and conveys the rest of the first melt to a first slicing device (300) to prepare slices of the first melt; wherein the first melt to be conveyed to the multilayer film production device (200) is conveyed through a first compensation pipe (20) and a first main conveying pipe (30) connected in parallel, the melt flow in the first compensation pipe (20) being controlled by the pressure in the first main conveying pipe (30);
simultaneously with the production of the first mould layer A, a second melt for the production of the second mould layer B is fed directly via a second melt feed pump (100') to at least one second flow distribution valve (10'); a second flow distribution valve (10') simultaneously delivering a portion of the second melt to the multilayer film manufacturing apparatus (200) and the remaining portion of the second melt to a second slicing apparatus (300'); wherein the second melt to be fed to the multilayer film production device (200) is fed through a second compensation pipe (20') and a second main feed pipe (30') connected in parallel, the melt flow in the second compensation pipe (20') being controlled by the pressure in the second main feed pipe (30').
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