CN110978319A - Modified plastic granulation process and system for efficiently utilizing submerged sheet material - Google Patents

Abstract

The invention discloses a modified plastic granulation process and a system for efficiently utilizing a submerged sheet material, and aims to provide a modified plastic granulation process and a system thereof, which are energy-saving and environment-friendly and meet the requirement of large-scale production. The modified plastic granulation process comprises the following steps: the method comprises the following steps: pretreating raw materials; step two: uniformly mixing the raw materials; step three: and (4) granulating the modified plastic. After the washing and separation treatment of the sinking sheet material, the sinking sheet material is directly used as one of the raw materials for the subsequent modified plastic granulation, so that the resource utilization rate of the waste plastic is improved to the maximum extent, and the environmental pollution is reduced.

Description

Modified plastic granulation process and system for efficiently utilizing submerged sheet material

Technical Field

The invention relates to the technical field of resource utilization of waste plastics, in particular to a modified plastic granulation process and system for efficiently utilizing a submerged sheet material.

Background

As a chemical product, the plastic brings convenience to daily life of human beings, and also brings great influence to the global environment due to the fatal weakness that the plastic is difficult to degrade. Therefore, it is imperative to improve the resource utilization efficiency of waste plastics from the viewpoint of environmental protection and sustainable development. As a powerful support point of a sustainable development strategy, the technical progress and the industrialization process of plastic resource utilization are macroscopically related to a plurality of topics such as ecological protection, efficient resource utilization, economic sustainable development and the like, and microscopically more related to daily life of each household, which is not necessarily unimportant.

In the face of the new trend, new task and new requirement, the current resource utilization technology level of the waste plastics is still obviously insufficient. At present, in a waste plastic modification granulation process, heavy impurities are contained in a sinking material generated after waste plastic sheet materials are cleaned, the cleaned heavy impurities cannot be discharged in time, the heavy impurities are easily re-adhered to the material, and the heavy impurities are conveyed along with a cleaning medium and the material, so that the effective utilization rate of the sinking material is low. Meanwhile, a heating system of the traditional plastic granulator adopts resistance wires for heating, so that the working efficiency is low, and the heat loss is large, so that the working environment is severe. The research on the resource utilization of the waste plastics needs to be further deepened so as to meet the requirements of the waste plastics on the technology and the process in the aspects of quality stability, formula applicability, energy conservation, consumption reduction and the like during large-scale industrial production.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a modified plastic granulation process and a system thereof, wherein the modified plastic granulation process has the advantages of high utilization rate of the submerged sheet material, low production cost, stable quality of modified plastic, energy conservation and environmental protection and can meet the requirement of large-scale production.

In order to solve the technical problems, the invention is realized by the following technical scheme:

a modified plastic granulation process efficiently utilizing sinking sheet materials comprises the following steps:

the method comprises the following steps: pretreatment of raw materials

Removing impurities from the waste plastic raw material, crushing with water, rubbing, cleaning, dehydrating, and storing for later use after pretreatment is completed;

step two: raw material uniform mixing

Feeding the measured raw materials into a mixing tank according to a formula, stirring and mixing, adding a certain modification auxiliary agent, and stirring and mixing for a certain time;

step three: modified plastic granulation

After being metered by a feeding system, the uniformly mixed raw materials are sent into a plastic granulator set for heating, melting and extruding; cutting the strip-shaped materials into cylindrical particles by a granulator; cooling the cylindrical particles through a cooling groove; then the mixture enters a vertical dehydrator for dehydration; and (3) enabling the dehydrated particles to enter a linear vibration sieve to sort out uniform qualified particles, removing dust, conveying the clean qualified materials into a storage bin through air conveying, storing and packaging.

Preferably, the waste plastic raw materials are divided into waste plastic sheet materials and waste plastic film materials, and the pretreatment of the waste plastic sheet materials and the waste plastic film materials is divided into two systems which can simultaneously carry out pretreatment on the corresponding raw materials.

Preferably, the pretreatment process of the waste plastic sheet materials comprises the steps of feeding the waste plastic sheet materials into a feeding screw conveyor, wherein a magnetic separation device is arranged on the feeding screw conveyor to remove ferromagnetic metals; the waste plastic sheet materials are conveyed into a spiral friction cleaning machine through a feeding spiral conveyor to be cleaned for the first time, the waste plastic sheet materials are conveyed into a cleaning separation tank through a filtering spiral conveyor after the first cleaning, and the floating materials and the sinking materials are cleaned and separated in the cleaning separation tank. The floating material enters a horizontal centrifugal dehydrator for dehydration and then enters a spiral bin for storage, the sinking material enters a sinking material separator for separation again, heavy impurities are removed, and the obtained high-density plastic sheet material enters the horizontal centrifugal dehydrator for dehydration and then enters the spiral bin for storage.

Preferably, the waste plastic film material is sent into a crusher for crushing through a feeding belt conveyor, and a magnetic separation device is arranged on the feeding belt conveyor to remove ferromagnetic metals; sending the crushed materials into a friction cleaning machine through a screw conveyor for primary cleaning, sending the materials subjected to the primary cleaning into an inclined friction cleaning machine for secondary cleaning, sending the membrane materials subjected to the secondary cleaning into a rinsing tank through a water-filtering screw conveyor for tertiary rinsing, granulating the membrane materials subjected to the tertiary rinsing through a film extrusion granulator, and bagging and storing the obtained membrane material particles in a hopper.

Preferably, the aperture of the screen mesh of the crusher for the waste plastic film material is less than or equal to phi 70 mm.

Preferably, the stirring and blending time in the material mixing tank is 30-40 min, and the rotating speed is 3-10 r/min.

Preferably, in the third step, the melting granulation temperature of the plastic granulator set is 170-210 ℃.

Preferably, in the third step, the raw materials are heated and melted by magnetic force, and the frequency of an electromagnetic heating power supply is 5-40 kHz.

A modified plastic granulation system for efficiently utilizing sinking sheet materials comprises a waste plastic sheet material pretreatment subsystem, a waste plastic film material pretreatment subsystem, a raw material uniform mixing subsystem and a modified plastic granulation subsystem; the waste plastic sheet material pretreatment subsystem comprises a feeding screw conveyor for receiving sheet materials, a first double-screw friction cleaning machine for receiving the output materials of the feeding screw conveyor and carrying out primary cleaning, a first water filtering screw conveyor with the input end connected with the material outlet of the first double-screw friction cleaning machine, a cleaning separator for secondary cleaning and separation connected with the output end of the first water filtering screw conveyor at the material inlet, a second water filtering screw conveyor with the input end connected with the submerged material outlet of the cleaning separator, a submerged material separator connected with the output end of the second water filtering screw conveyor at the material inlet and used for removing impurities and separating submerged materials again, a first conveyor with the input end connected with the outlet of the submerged material separator, and a first horizontal centrifugal dehydrator connected with the output end of the first conveyor at the material inlet and used for separating and drying the submerged materials again, the device comprises a first spiral bin with a material inlet connected with an outlet of a first horizontal centrifugal dehydrator, a second conveyor with an input end connected with a floating material outlet of a cleaning separator, a second horizontal centrifugal dehydrator for drying floating materials and with a material inlet connected with an output end of the second conveyor, and a second spiral bin with a material inlet connected with an outlet of the second horizontal centrifugal dehydrator;

the waste plastic film material pretreatment subsystem comprises a feeding belt conveyor for receiving film materials, a crusher with an input end connected with a discharge end of the feeding belt conveyor and used for crushing the film materials, a screw conveyor with an input end connected with a material outlet of the crusher, a second double-spiral friction cleaning machine with an input end connected with an output end of the screw conveyor and used for cleaning for the first time, and a material outlet of the second double-spiral friction cleaning machine with an input end connected, the device comprises an inclined friction cleaning machine for secondary cleaning, a rinsing tank, a water-filtering screw conveyor, a film extrusion granulator and a third spiral bin, wherein a material inlet of the inclined friction cleaning machine is connected with the output end of the inclined friction cleaning machine and used for tertiary rinsing;

the raw material uniform mixing subsystem comprises a raw material lifting belt conveyor for receiving materials output by the first spiral bin, the second spiral bin and the third spiral bin, and a raw material mixing tank with a raw material inlet connected with an outlet of the raw material lifting belt conveyor;

the modified plastic granulation subsystem comprises a feeding machine for receiving the output materials of the raw material mixing tank, a material inlet, a feeding machine outlet, a plastic granulation machine set for modified plastic granulation, a granulator, a cooling tank, a vertical dehydrator, a double-layer linear vibrating screen, an air supply system and a storage bin, wherein the material inlet is connected with the feeding machine outlet, the plastic granulation machine set is used for modified plastic granulation, the granulator is connected with the plastic granulation machine set outlet, the cooling tank is connected with the material inlet and the granulator outlet, the vertical dehydrator is connected with the material inlet and the cooling tank outlet, the inlet end is connected with the material outlet of the vertical dehydrator, the double-layer linear vibrating screen is used for sorting uniformly qualified particles, the air supply system.

Preferably, the feeding screw conveyor and the feeding belt conveyor are both provided with a magnetic separation device.

Compared with the prior art, the invention has the following advantages:

in the whole production process, the waste plastic raw materials are subjected to removal of impurities such as ferromagnetic metals, silt, stones and the like, water-carrying crushing, friction cleaning, dehydration treatment and the like, particularly after cleaning and separation treatment of the sinking sheet materials, the sinking sheet materials are directly used as one of the raw materials for subsequent modified plastic granulation, so that the resource utilization rate of the waste plastics is improved to the greatest extent, and the environmental pollution is reduced. The waste plastic pretreatment system and the granulation system are matched with each other, so that the waste plastic is more comprehensively utilized and the utilization range is wider, and the waste plastic raw materials are separately treated in different types, so that the pretreatment process is simple and easy to control, the energy consumption is obviously reduced, and the process is simpler; the whole waste plastic modification and granulation process is easier to realize automation and intellectualization, reduces the manual interference, stably controls the quality and uniformity of products, improves the production efficiency and the product yield, and reduces the consumption of raw materials and energy sources so as to meet the requirements of technologies and processes in the aspects of production and manufacturing capacity, quality stability, formula applicability, energy conservation, consumption reduction and the like during large-scale industrial production of waste plastic modification and granulation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a process flow diagram of the present invention.

FIG. 2 is a schematic diagram of a waste plastic sheet pre-treatment subsystem.

FIG. 3 is a schematic diagram of a waste plastic film pretreatment subsystem.

Fig. 4 is a schematic diagram of a raw material mixing subsystem and a modified plastic granulation subsystem.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention. In the following description, for the purpose of clearly illustrating the structure and operation of the present invention, reference will be made to the accompanying drawings by way of directional terms, but terms such as "front", "rear", "left", "right", "up", "down", etc. should be construed as words of convenience and should not be construed as limiting terms.

A modified plastic granulation process for efficiently utilizing submerged sheet materials is disclosed, and a process flow diagram is shown in figure 1, and comprises the following contents:

the method comprises the following steps: pretreatment of raw materials

Removing impurities such as ferromagnetic metal, silt, stones and the like from the waste plastic raw material, crushing with water, rubbing, cleaning, dehydrating and the like, and storing for later use after pretreatment is finished;

the waste plastic raw materials are divided into waste plastic sheet materials and waste plastic film materials, the pretreatment of the waste plastic sheet materials and the waste plastic film materials is divided into two systems, and the two systems can simultaneously carry out pretreatment on corresponding raw materials.

The pretreatment process of the waste plastic sheet materials comprises the steps of feeding the waste plastic sheet materials into a feeding screw conveyor, wherein a magnetic separation device is arranged on the feeding screw conveyor to remove ferromagnetic metals; the waste plastic sheet materials are conveyed into a spiral friction cleaning machine through a feeding spiral conveyor to be cleaned for the first time, the waste plastic sheet materials are conveyed into a cleaning separation tank through a filtering spiral conveyor after the first cleaning, and the floating materials and the sinking materials are cleaned and separated in the cleaning separation tank. The floating material enters a horizontal centrifugal dehydrator for dehydration and then enters a spiral bin for storage, the sinking material enters a sinking material separator for separation again, heavy impurities are removed, and the obtained high-density plastic sheet material enters the horizontal centrifugal dehydrator for dehydration and then enters the spiral bin for storage.

And (5) separating the settled sheets in a settled material separator again to remove heavy impurities, so as to obtain high-density plastic sheets for reuse.

The pretreatment process of the waste plastic film material comprises the steps of feeding the waste plastic film material into a crusher through a feeding belt conveyor for crushing, wherein a magnetic separation device is arranged on the feeding belt conveyor to remove ferromagnetic metal; sending the crushed materials into a friction cleaning machine through a screw conveyor for primary cleaning, sending the materials subjected to the primary cleaning into an inclined friction cleaning machine for secondary cleaning, sending the membrane materials subjected to the secondary cleaning into a rinsing tank through a water-filtering screw conveyor for tertiary rinsing, granulating the membrane materials subjected to the tertiary rinsing through a film extrusion granulator, and bagging and storing the obtained membrane material particles in a hopper. The screen mesh aperture of the crusher of the waste plastic film material is less than or equal to phi 70 mm.

Step two: raw material uniform mixing

Feeding the measured raw materials into a mixing tank according to a formula, stirring and mixing, adding a certain modification auxiliary agent, and stirring and mixing for a certain time; in the embodiment, the mixing time in the mixing tank is 30-40 min, and the rotating speed is 3-10 r/min.

The uniformly mixed raw materials are accurately metered and sent into the granulator set through the feeding system, and the stability and uniformity of the product quality are ensured.

Step three: modified plastic granulation

After being metered by a feeding system, the uniformly mixed raw materials are sent into a plastic granulator set for heating, melting and extruding; cutting the strip-shaped materials into cylindrical particles by a granulator; cooling the cylindrical particles through a cooling groove; then the mixture enters a vertical dehydrator for dehydration; and (3) enabling the dehydrated particles to enter a linear vibration sieve to sort out uniform qualified particles, removing dust, conveying the clean qualified materials into a storage bin through air conveying, storing and packaging.

In this embodiment, the melting granulation temperature of the plastic granulator set is 170 ℃ to 210 ℃. The raw materials are heated and melted by magnetic force, and the frequency of an electromagnetic heating power supply is 5-40 kHz.

The waste plastic pretreatment process can be used for carrying out multiple and multistage cleaning on different impurities of different raw materials aiming at the condition of raw material incoming materials, so that the impurities in the waste plastic can be effectively separated, the raw materials are purer, the quality of modified plastic particles is improved, the energy consumption is reduced, and the concept of continuous development and clean production is met.

The sinking sheet material has low value and is little or not used in the traditional process, in the process, the sinking sheet material enters a sinking material separator for separation again, heavy impurities are removed, high-density plastic sheet material can be obtained and used as one of raw materials for subsequent modified plastic granulation, modified plastic particles with excellent performance and extremely competitive physique are finally produced by optimizing the process and the operation parameters of a plastic granulator set, the aim of improving the resource utilization efficiency of waste plastics is fulfilled, and the reduction of non-degradable garbage is realized.

The modified plastic granulation system efficiently utilizing the sinking sheet materials shown in fig. 2-4 comprises a waste plastic sheet material pretreatment subsystem A, a waste plastic film material pretreatment subsystem B, a raw material uniform mixing subsystem C and a modified plastic granulation subsystem D; the waste plastic flake pretreatment subsystem A comprises a feeding screw conveyor a1 for receiving flakes, a first double-screw friction cleaning machine a2 for receiving materials output by the feeding screw conveyor a1 and performing primary cleaning, a first water-filtering screw conveyor a3 with an input end connected with a material outlet of the first double-screw friction cleaning machine a2, a cleaning separator a4 for secondary cleaning and separation and a material inlet connected with an output end of the first water-filtering screw conveyor a3, a second water-filtering screw conveyor a5 with an input end connected with a submerged material outlet of the cleaning separator a4, a submerged material separator a6 with an input end connected with an output end of the second water-filtering screw conveyor a5 and used for removing impurities and separating the submerged material again, a first conveyor a7 with an input end connected with an outlet of the submerged material separator a6, a first horizontal centrifugal dehydrator a8 with an input end connected with an output end of the first conveyor a7 and used for separating the submerged material again and drying, a first spiral bin a9 with a material inlet connected with an outlet of a first horizontal centrifugal dehydrator a8, a second conveyor a10 with an input end connected with a floating material outlet of a cleaning separator a4, a second horizontal centrifugal dehydrator a11 with a material inlet connected with an output end of the second conveyor a10 and used for drying floating materials, and a second spiral bin a12 with a material inlet connected with an outlet of a11 of the second horizontal centrifugal dehydrator;

the waste plastic film material pretreatment subsystem B comprises a feeding belt machine B1 for receiving a film material, a crusher B2 with an input end connected with a discharge end of a feeding belt machine B1 and used for crushing the film material, a screw conveyor B3 with an input end connected with a material outlet of a crusher B2, a second double-spiral friction cleaning machine B4 with an input end connected with an output end of a screw conveyor B3 and used for primary cleaning, an inclined friction cleaning machine B5 with an input end connected with a material outlet of a second double-spiral friction cleaning machine B4 and used for secondary cleaning, a rinsing tank B6 with a material inlet connected with an output end of the inclined friction cleaning machine B5 and used for tertiary rinsing, a rinsing screw conveyor B7 with an input end connected with an outlet of a water filtering tank B6, a film extrusion granulator B8 with a material inlet connected with an output end of a water filtering screw conveyor B7 and used for granulating the film material, and a third spiral bin b9 with a material inlet connected with the outlet of the film extrusion granulator b 8;

the raw material uniform mixing subsystem C comprises a raw material lifting belt conveyor C1 and a raw material mixing tank C2, wherein the raw material lifting belt conveyor C1 is used for receiving materials output by a first spiral bin a9, a second spiral bin a12 and a third spiral bin b9, and a raw material inlet is connected with an outlet of a raw material lifting belt conveyor C1;

the modified plastic granulation subsystem D comprises a feeding machine D1 used for receiving materials output by a raw material mixing tank c2, a plastic granulator D2 connected with a material inlet and a D1 outlet of the feeding machine and used for modified plastic granulation, a granulator D3 connected with an outlet of the plastic granulator D2, a cooling tank D4 connected with a D3 outlet of the granulator through the material inlet, a vertical dehydrator D5 connected with a material inlet and a D4 outlet of the cooling tank, a double-layer linear vibrating screen D6 connected with a material outlet of the vertical dehydrator D5 through an inlet end and used for sorting uniform and qualified particles, an air supply system D7 connected with a material outlet of the double-layer linear vibrating screen D6 through the material inlet, and a storage bin D8 used for receiving the materials output by the air supply system D7.

In this embodiment, the sinking material separator a6 separates the sinking materials again by the impulsive force of water and its own gravity, and can separate different sinking materials by adjusting the impulsive force of water. The sinking water material separator a6 is provided with a water medium circulating system, and the used water medium can be recycled. The raw material uniform mixing subsystem adopts a horizontal mixing tank, different raw materials can be accurately and fully mixed according to a formula, and the quality stability and uniformity of modified plastic particles are ensured. The plastic granulator d2 adopts magnetic hot melting, has high thermal efficiency, improves the granulation efficiency of a granulator set, and improves the field working environment.

In this embodiment, the feeding screw conveyor a1 and the feeding belt conveyor b1 are both provided with magnetic separation devices (not shown in the figure) to remove ferromagnetic metals in the incoming materials.

In the whole production process, the waste plastic raw materials are subjected to removal of impurities such as ferromagnetic metals, silt, stones and the like, water-carrying crushing, friction cleaning, dehydration treatment and the like, particularly after cleaning and separation treatment of the sinking sheet materials, the sinking sheet materials are directly used as one of the raw materials for subsequent modified plastic granulation, so that the resource utilization rate of the waste plastics is improved to the greatest extent, and the environmental pollution is reduced. The waste plastic pretreatment system and the granulation system are matched with each other, so that the waste plastic is more comprehensively utilized and the utilization range is wider, and the waste plastic raw materials are separately treated in different types, so that the pretreatment process is simple and easy to control, the energy consumption is obviously reduced, and the process is simpler; the whole waste plastic modification and granulation process is easier to realize automation and intellectualization, reduces the manual interference, stably controls the quality and uniformity of products, improves the production efficiency and the product yield, and reduces the consumption of raw materials and energy sources so as to meet the requirements of technologies and processes in the aspects of production and manufacturing capacity, quality stability, formula applicability, energy conservation, consumption reduction and the like during large-scale industrial production of waste plastic modification and granulation.

The mechanical equipment and the mechanical system involved in the invention are all the prior art, and can be completely realized by a person skilled in the art without additional remarks.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention. It will be understood by those skilled in the art that any modification, equivalent replacement, or improvement made on the technical solutions or parts of the technical features described in the above embodiments can be included in the scope of protection of the present invention within the spirit and principle of the present invention.

Claims (10)

1. A modified plastic granulation process for efficiently utilizing submerged sheet materials is characterized by comprising the following steps:

the method comprises the following steps: pretreatment of raw materials

Removing impurities from the waste plastic raw material, crushing with water, rubbing, cleaning, dehydrating, and storing for later use after pretreatment is completed;

step two: raw material uniform mixing

Feeding the measured raw materials into a mixing tank according to a formula, stirring and mixing, adding a certain modification auxiliary agent, and stirring and mixing for a certain time;

step three: modified plastic granulation

After being metered by a feeding system, the uniformly mixed raw materials are sent into a plastic granulator set for heating, melting and extruding; cutting the strip-shaped materials into cylindrical particles by a granulator; cooling the cylindrical particles through a cooling groove; then the mixture enters a vertical dehydrator for dehydration; and (3) enabling the dehydrated particles to enter a linear vibration sieve to sort out uniform qualified particles, removing dust, conveying the clean qualified materials into a storage bin through air conveying, storing and packaging.

2. The granulation process of modified plastic with high efficiency of using submerged sheet material as claimed in claim 1, wherein: the waste plastic raw materials are divided into waste plastic sheet materials and waste plastic film materials, the pretreatment of the waste plastic sheet materials and the waste plastic film materials is divided into two systems, and the two systems can simultaneously carry out pretreatment on corresponding raw materials.

3. The granulation process of modified plastic with high efficiency of using submerged sheet material as claimed in claim 2, wherein: the pretreatment process of the waste plastic sheet materials comprises the steps of feeding the waste plastic sheet materials into a feeding screw conveyor, wherein a magnetic separation device is arranged on the feeding screw conveyor to remove ferromagnetic metals; the waste plastic sheet materials are conveyed into a spiral friction cleaning machine through a feeding spiral conveyor to be cleaned for the first time, the waste plastic sheet materials are conveyed into a cleaning separation tank through a filtering spiral conveyor after the first cleaning, and the floating materials and the sinking materials are cleaned and separated in the cleaning separation tank. The floating material enters a horizontal centrifugal dehydrator for dehydration and then enters a spiral bin for storage, the sinking material enters a sinking material separator for separation again, heavy impurities are removed, and the obtained high-density plastic sheet material enters the horizontal centrifugal dehydrator for dehydration and then enters the spiral bin for storage.

4. The granulation process of modified plastic with high efficiency of using submerged sheet material as claimed in claim 2, wherein: the pretreatment process of the waste plastic film material comprises the steps of feeding the waste plastic film material into a crusher through a feeding belt conveyor for crushing, wherein a magnetic separation device is arranged on the feeding belt conveyor to remove ferromagnetic metal; sending the crushed materials into a friction cleaning machine through a screw conveyor for primary cleaning, sending the materials subjected to the primary cleaning into an inclined friction cleaning machine for secondary cleaning, sending the membrane materials subjected to the secondary cleaning into a rinsing tank through a water-filtering screw conveyor for tertiary rinsing, granulating the membrane materials subjected to the tertiary rinsing through a film extrusion granulator, and bagging and storing the obtained membrane material particles in a hopper.

5. The granulation process of modified plastic with high efficiency of using submerged sheet material as claimed in any one of claims 1 to 4, wherein: the screen mesh aperture of the crusher of the waste plastic film material is less than or equal to phi 70 mm.

6. The granulation process of modified plastic with high efficiency of using submerged sheet material as claimed in any one of claims 1 to 4, wherein: the stirring and blending time in the material mixing tank is 30-40 min, and the rotating speed is 3-10 r/min.

7. The granulation process of modified plastic with high efficiency of using submerged sheet material as claimed in any one of claims 1 to 4, wherein: in the third step, the melting granulation temperature of the plastic granulator set is 170-210 ℃.

8. The granulation process of modified plastic with high efficiency of using submerged sheet material as claimed in any one of claims 1 to 4, wherein: in the third step, the raw materials are heated and melted by magnetic force, and the frequency of an electromagnetic heating power supply is 5-40 kHz.

9. A modified plastic granulation system for efficiently utilizing sinking sheet materials comprises a waste plastic sheet material pretreatment subsystem, a waste plastic film material pretreatment subsystem, a raw material uniform mixing subsystem and a modified plastic granulation subsystem; the method is characterized in that:

the waste plastic sheet material pretreatment subsystem comprises a feeding screw conveyor for receiving sheet materials, a first double-screw friction cleaning machine for receiving the output materials of the feeding screw conveyor and carrying out primary cleaning, a first water filtering screw conveyor with the input end connected with the material outlet of the first double-screw friction cleaning machine, a cleaning separator for secondary cleaning and separation connected with the output end of the first water filtering screw conveyor at the material inlet, a second water filtering screw conveyor with the input end connected with the submerged material outlet of the cleaning separator, a submerged material separator connected with the output end of the second water filtering screw conveyor at the material inlet and used for removing impurities and separating submerged materials again, a first conveyor with the input end connected with the outlet of the submerged material separator, and a first horizontal centrifugal dehydrator connected with the output end of the first conveyor at the material inlet and used for separating and drying the submerged materials again, the device comprises a first spiral bin with a material inlet connected with an outlet of a first horizontal centrifugal dehydrator, a second conveyor with an input end connected with a floating material outlet of a cleaning separator, a second horizontal centrifugal dehydrator for drying floating materials and with a material inlet connected with an output end of the second conveyor, and a second spiral bin with a material inlet connected with an outlet of the second horizontal centrifugal dehydrator;

the waste plastic film material pretreatment subsystem comprises a feeding belt conveyor for receiving film materials, a crusher with an input end connected with a discharge end of the feeding belt conveyor and used for crushing the film materials, a screw conveyor with an input end connected with a material outlet of the crusher, a second double-spiral friction cleaning machine with an input end connected with an output end of the screw conveyor and used for cleaning for the first time, and a material outlet of the second double-spiral friction cleaning machine with an input end connected, the device comprises an inclined friction cleaning machine for secondary cleaning, a rinsing tank, a water-filtering screw conveyor, a film extrusion granulator and a third spiral bin, wherein a material inlet of the inclined friction cleaning machine is connected with the output end of the inclined friction cleaning machine and used for tertiary rinsing;

the raw material uniform mixing subsystem comprises a raw material lifting belt conveyor for receiving materials output by the first spiral bin, the second spiral bin and the third spiral bin, and a raw material mixing tank with a raw material inlet connected with an outlet of the raw material lifting belt conveyor;

the modified plastic granulation subsystem comprises a feeding machine for receiving the output materials of the raw material mixing tank, a material inlet, a feeding machine outlet, a plastic granulation machine set for modified plastic granulation, a granulator, a cooling tank, a vertical dehydrator, a double-layer linear vibrating screen, an air supply system and a storage bin, wherein the material inlet is connected with the feeding machine outlet, the plastic granulation machine set is used for modified plastic granulation, the granulator is connected with the plastic granulation machine set outlet, the cooling tank is connected with the material inlet and the granulator outlet, the vertical dehydrator is connected with the material inlet and the cooling tank outlet, the inlet end is connected with the material outlet of the vertical dehydrator, the double-layer linear vibrating screen is used for sorting uniformly qualified particles, the air supply system.

10. The system of claim 9, wherein said system further comprises: and magnetic separation devices are arranged on the feeding screw conveyor and the feeding belt conveyor.

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