CN111791454A - Method for increasing whiteness in bottle chip granulation process - Google Patents
Method for increasing whiteness in bottle chip granulation process Download PDFInfo
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- CN111791454A CN111791454A CN202010610358.1A CN202010610358A CN111791454A CN 111791454 A CN111791454 A CN 111791454A CN 202010610358 A CN202010610358 A CN 202010610358A CN 111791454 A CN111791454 A CN 111791454A
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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/287—Raw material pre-treatment while feeding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/27—Cleaning; Purging; Avoiding contamination
- B29C48/271—Cleaning; Purging; Avoiding contamination of feeding units
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention relates to a method for increasing whiteness in a bottle chip granulation process, and belongs to the field of spinning. The invention comprises the following steps: firstly, drying regenerated bottle flakes; secondly, vacuumizing a screw feeding hole; thirdly, melting the regenerated bottle slice screw; fourthly, filtering the melt; and fifthly, granulating by a granulator. The vacuum pumping device is adopted to pump away oxygen mixed with the bottle chips from the regenerated bottle chip drying tower before the bottle chips enter the screw extruder, a negative pressure section is formed at a jacket layer of a feeding area of the screw extruder, and before the regenerated bottle chips continuously coming from the regenerated bottle chip drying tower enter the screw extruder, air mixed with the regenerated bottle chips is pumped away through the jacket layer, so that the situation that the air enters the screw rod to cause the yellowing of the chips due to the oxidation in the melting process of the bottle chips is avoided, and the B value of the chips can be controlled by adjusting the opening degree of the vacuum adjusting valve.
Description
Technical Field
The invention relates to a method for increasing whiteness in a bottle chip granulation process, and belongs to the field of spinning.
Background
When conventional regeneration bottle piece granulation, regeneration bottle piece when dry gets into screw rod melting process, partly dry gas in the drying tower can get into the screw rod along with regeneration bottle piece together, oxygen in the bottle piece melting process air can carry out oxidation reaction to the bottle piece fuse-element, thereby make the obvious yellow appearance of particle of cutting out appear, regeneration bottle piece granulation turn yellow reason one of, regeneration bottle piece dry unloading pipe mix with oxygen can get into the oxidation reaction that the screw rod melting takes place together with regeneration bottle piece when melting process and so on, make the granulation section yellow partially.
In view of this, a method for producing a high-whiteness polyester PET bottle sheet is disclosed in patent document No. 201410665638.7.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for increasing whiteness in a bottle chip granulation process, which has a reasonable structural design.
The technical scheme adopted by the invention for solving the problems is as follows: the method for increasing whiteness in the bottle chip granulation process is characterized in that: the method for increasing whiteness in the bottle chip granulation process comprises the following steps:
step one, drying regenerated bottle flakes: the aim of drying the regenerated bottle chips is to effectively remove water in the regenerated bottle chips, reduce granulation slice yellowing caused by oxidation reaction of the regenerated bottle chips in the screw melting process, and dry the regenerated bottle chips by adopting continuous fluidized bed drying equipment;
secondly, vacuumizing a screw feeding hole: vacuumizing a screw feeding hole by using a vacuumizing device to pump out oxygen so as to prevent the regenerated bottle flakes from carrying out oxidation reaction on bottle flake melts by the oxygen in the screw melting process, so that cut particles are obviously yellowish;
step three, melting the regenerated bottle flake screw: the vacuumized bottle flakes enter a screw extruder to be subjected to screw rod melting, the regenerated bottle flake screw rod is divided into a feeding section, a melting section, a compression section and a mixing section, and eight areas are adopted for independent temperature control to ensure that the regenerated bottle flakes are completely and fully melted;
fourthly, filtering the melt;
fifthly, granulating by a granulator;
the method for increasing the whiteness in the bottle chip granulation process is realized by adopting a system for increasing the whiteness in the bottle chip granulation process, wherein the system for increasing the whiteness in the bottle chip granulation process comprises a regenerated bottle chip drying tower, a vacuumizing device, a screw extruder and a granulator, the regenerated bottle chip drying tower is connected with the vacuumizing device, the vacuumizing device is connected with the screw extruder, and the screw extruder is connected with the granulator.
Furthermore, in the first step, the crystallization temperature is 150-185 ℃, the drying temperature is 150-180 ℃, the dry air flow is 450L/M3, the drying time is 5-8 h, and the water content of the regenerated bottle flakes is controlled to be 50-100 ppm.
Furthermore, in the third step, the process temperature of each zone is 265-300 ℃ in the first zone, 265-300 ℃ in the second zone, 265-300 ℃ in the third zone, 265-300 ℃ in the fourth zone, 265-300 ℃ in the fifth zone, 265-300 ℃ in the sixth zone, 265-290 ℃ in the seventh zone and 265-290 ℃ in the eighth zone.
Further, the vacuumizing device comprises a jacket layer, an air filter and a negative pressure Roots blower, the regeneration bottle piece drying tower is connected with the jacket layer, the jacket layer is connected with the screw extruder, the air filter is connected with the jacket layer, and the negative pressure Roots blower is connected with the air filter; after the vacuum pumping process is added, air and the bottle chips enter the screw extruder together, so that the oxidation process is reduced in the bottle chip melting process.
Furthermore, the vacuum pumping device also comprises a vacuum adjusting pipeline and a vacuum adjusting valve, the vacuum adjusting pipeline is connected with the roots pressing fan, and the vacuum adjusting valve is arranged on the vacuum adjusting pipeline; through the adjustment of the opening of the vacuum regulating valve, the vacuum degree of the Roots blower can be reduced, the lower the vacuum degree is, the more air is pumped out, and the whiter the slice after final granulation is.
Furthermore, the jacket layer comprises a vacuum tube, an outer sleeve, an inner tube and meshes, one end of the vacuum tube is connected with the air filter, the other end of the vacuum tube is connected with the outer sleeve, the inner tube is sleeved in the outer sleeve, the meshes are arranged on the inner tube and matched with the vacuum tube, one end of the inner tube is connected with the regenerated bottle piece drying tower, and the other end of the inner tube is connected with the screw extruder.
Further, the air filter comprises a filter shell, a filter layer, an air inlet pipe and an air outlet pipe, wherein the filter layer is installed in the filter shell, an air outlet cavity is formed in the filter layer, an air inlet cavity is formed between the inner wall of the filter shell and the outer wall of the filter layer, one end of the air inlet pipe is connected with a vacuumizing device, the other end of the air inlet pipe is communicated with the air inlet cavity, one end of the air outlet pipe is communicated with the air outlet cavity, and the other end of the air outlet pipe is connected with the negative-pressure Roots blower.
Further, an exhaust pipe is installed on the negative pressure Roots blower.
Furthermore, the inner diameter of the outer sleeve is larger than the outer diameter of the inner tube, a gap is formed between the inner wall of the outer sleeve and the outer wall of the inner tube, so that meshes arranged around the inner tube are communicated with the vacuum tube, and the aperture of each mesh is smaller than the particle size of the bottle piece, so that the bottle piece is prevented from passing through the mesh; and/or; the distance between two meshes arranged at the uppermost end and the lowermost end of the inner pipe is less than the length of the outer sleeve.
Further, the filter layer is non-woven fabrics, prevents that impurity suction negative pressure roots's fan from causing the jam.
Compared with the prior art, the invention has the following advantages: the vacuum pumping device is adopted to pump away oxygen mixed with the bottle chips from the regenerated bottle chip drying tower before the bottle chips enter the screw extruder, a negative pressure section is formed at a jacket layer of a feeding area of the screw extruder, and before the regenerated bottle chips continuously coming from the regenerated bottle chip drying tower enter the screw extruder, air mixed with the regenerated bottle chips is pumped away through the jacket layer, so that the situation that the air enters the screw rod to cause the yellowing of the chips due to the oxidation in the melting process of the bottle chips is avoided, and the B value of the chips can be controlled by adjusting the opening degree of the vacuum adjusting valve.
Drawings
FIG. 1 is a schematic diagram showing the connection relationship of a system for increasing whiteness in a granulation process of a bottle chip according to an embodiment of the present invention.
Fig. 2 is a schematic perspective view of a jacket layer according to an embodiment of the present invention.
Fig. 3 is a front view of the jacket layer according to the embodiment of the present invention.
Fig. 4 is a schematic view of the cross-sectional structure a-a in fig. 3.
Fig. 5 is a schematic perspective view of an air filter according to an embodiment of the present invention.
Fig. 6 is a front view schematically showing the structure of an air filter according to an embodiment of the present invention.
Fig. 7 is a schematic view of a sectional structure B-B in fig. 6.
In the figure: the device comprises a regeneration bottle flake drying tower 1, a vacuumizing device 2, a screw extruder 3, a granulator 4, a jacket layer 5, an air filter 6, a negative pressure Roots blower 7, a vacuum adjusting pipeline 8, a vacuum adjusting valve 9, a vacuum pipe 10, a jacket 11, an inner pipe 12, a mesh 13, a filter shell 14, a filter layer 15, an air inlet cavity 16, an air outlet cavity 17, an air inlet pipe 18, an air outlet pipe 19 and an air outlet pipe 20.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1 to 7, it should be understood that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the function and the achievable purpose of the present invention. In the present specification, the terms "upper", "lower", "left", "right", "middle" and "one" are used for clarity of description, and are not used to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.
The method for increasing whiteness in the bottle chip granulation process in the embodiment comprises the following steps:
step one, drying regenerated bottle flakes: the aim of drying the regenerated bottle chips is to effectively remove water in the regenerated bottle chips, reduce granulation slice yellowing caused by oxidation reaction of the regenerated bottle chips in the screw melting process, and dry the regenerated bottle chips by adopting continuous fluidized bed drying equipment; the crystallization temperature is 150-185 ℃, the drying temperature is 150-180 ℃, the dry air flow is 450L/M3, the drying time is 5-8 h, and the water content of the regenerated bottle chips is controlled to be 50-100 ppm.
Secondly, vacuumizing a screw feeding hole: and vacuumizing the screw feeding hole by using a vacuumizing device 2 to pump out oxygen and avoid the oxidation reaction of the oxygen of the regenerated bottle chip on the bottle chip melt in the screw melting process, so that the cut particles have obvious yellow images.
Step three, melting the regenerated bottle flake screw: the vacuumized bottle chips enter a screw extruder 3 for screw melting, the regenerated bottle chip screw is divided into a feeding section, a melting section, a compression section and a mixing section, eight zones are independently controlled in temperature to ensure that the regenerated bottle chips are completely and fully melted, and the process temperature of each zone is 265-300 ℃ in a first zone, 265-300 ℃ in a second zone, 265-300 ℃ in a third zone, 265-300 ℃ in a fourth zone, 265-300 ℃ in a fifth zone, 265-300 ℃ in a sixth zone, 265-290 ℃ in a seventh zone and 265-290 ℃ in an eighth zone.
The fourth step: and (4) filtering the melt.
The fifth step: and (5) granulating by using a granulator.
The method for increasing whiteness in the bottle chip granulation process is realized by adopting the system for increasing whiteness in the bottle chip granulation process.
The system for increasing whiteness in the bottle flake granulation process in the embodiment comprises a regenerated bottle flake drying tower 1, a vacuumizing device 2, a screw extruder 3 and a granulator 4, wherein the regenerated bottle flake drying tower 1 is connected with the vacuumizing device 2, the vacuumizing device 2 is connected with the screw extruder 3, and the screw extruder 3 is connected with the granulator 4.
The vacuumizing device 2 in the embodiment comprises a jacket layer 5, an air filter 6, a negative pressure Roots blower 7, a vacuum adjusting pipeline 8 and a vacuum adjusting valve 9, wherein the regeneration bottle piece drying tower 1 is connected with the jacket layer 5, the jacket layer 5 is connected with a screw extruder 3, the air filter 6 is connected with the jacket layer 5, and the negative pressure Roots blower 7 is connected with the air filter 6; after the vacuum pumping process is added, air and the bottle chips enter the screw extruder 3 together, so that the oxidation process is reduced in the bottle chip melting process.
The vacuum adjusting pipeline 8 in the embodiment is connected with the pressure Roots blower 7, the vacuum adjusting valve 9 is arranged on the vacuum adjusting pipeline 8, and the negative pressure Roots blower 7 is provided with the exhaust pipe 20; the degree of vacuum pumping of the Roots blower 7 can be negatively pressurized by adjusting the opening degree of the vacuum adjusting valve 9, and the lower the degree of vacuum pumping, the more air is pumped, and the whiter the slice after final granulation is.
The jacket layer 5 in this embodiment includes a vacuum tube 10, an outer sleeve 11, an inner tube 12 and meshes 13, one end of the vacuum tube 10 is connected with the air filter 6, the other end of the vacuum tube 10 is connected with the outer sleeve 11, the inner tube 12 is sleeved in the outer sleeve 11, the meshes 13 are arranged on the inner tube 12, and the meshes 13 are matched with the vacuum tube 10, one end of the inner tube 12 is connected with the regenerated bottle piece drying tower 1, the other end of the inner tube 12 is connected with the screw extruder 3, the inner diameter of the outer sleeve 11 is larger than the outer diameter of the inner tube 12, a gap exists between the inner wall of the outer sleeve 11 and the outer wall of the inner tube 12, so that the meshes 13 arranged around the inner tube 12 are communicated with the vacuum tube 10, the aperture of the meshes 13 is smaller than the particle size of the bottle piece, so as to prevent the bottle piece from passing.
The air cleaner 6 in this embodiment includes filtering the shell 14, the filter layer 15, intake pipe 18 and outlet duct 19, filter layer 15 installs in filtering the shell 14, the inside of filter layer 15 is out the air cavity 17, form into the air cavity 16 between the inner wall of filtering the shell 14 and the outer wall of filter layer 15, the one end and the evacuating device 2 of intake pipe 18 are connected, the other end and the air cavity 16 intercommunication of intake pipe 18, the one end and the air cavity 17 intercommunication of outlet duct 19, the other end and the negative pressure roots blower 7 of outlet duct 19 are connected, filter layer 15 is the non-woven fabrics, prevent that impurity suction roots blower 7 from causing the jam.
Specifically, the jacket layer 5 comprises an outer sleeve 11 and an inner pipe 12, the inner pipe 12 is sleeved in the outer sleeve 11, the inner pipe 12 is a stainless steel pipe with the diameter of 300mm and is provided with meshes 13, the inner diameter of the inner pipe 12 is the same as that of a blanking pipe of the drying tower, and the diameter of each mesh 13 is 1 mm; the outer sleeve 11 is a stainless steel pipe with the diameter of 350mm, so that a gap is formed between the inner pipe 12 and the outer sleeve 11, and the meshes 13 arranged on the periphery of the inner pipe 12 are communicated with the gap and communicated with the vacuum pipe 10, so that the air is communicated.
The jacket layer 5 is connected in series between the regeneration bottle piece drying tower 1 and the screw extruder 3, the regeneration bottle piece can enter the screw extruder through the inner tube 12, a vacuum tube 10 with the inner diameter of 132mm made of stainless steel tube is connected to the outer wall of the stainless steel tube of the outer jacket 11, and the vacuum tube 7 to the negative pressure Roots blower 7, the middle of the vacuum tube is connected in series with an air filter 6 with the filtering area of 5 square meters, the filtering layer 15 in the air filter 6 is non-woven fabric with the filtering precision of 0.1mm, and the impurity is prevented from being pumped into the negative pressure Roots blower 7 to cause.
The negative pressure Roots blower (7) is adopted, an air inlet is separated through the 'meshing' of a pair of rotors (the rotors are provided with gaps and are not mutually contacted), the rotors are driven by a pair of synchronous gears to move in opposite directions, sucked air is pushed from an air suction port to an air exhaust port without internal compression, and the air is pressurized due to the backflow of high-pressure air at the air exhaust side at the moment of reaching the air exhaust port, so that the air conveying is completed; wherein the negative pressure Roots blower (7) is in the prior art.
The air inlet end of negative pressure roots's fan 7 is connected with outlet duct 19, and connect a vacuum regulation pipeline 8 on outlet duct 19, install vacuum control valve 9 on vacuum regulation pipeline 8 and carry out the vacuum degree and adjust, negative pressure roots's fan 7 starts the back like this, can form a negative pressure section in screw extruder 3's feeding region's the jacket layer 5 department, in the time of the regeneration bottle piece that gets off in succession from regeneration bottle piece drying tower gets into screw extruder 3, can take away the air that is mingled with in the regeneration bottle piece through jacket layer 5, stopped the air admission screw rod and caused the bottle piece melting in-process by the oxidation and cause the section to turn yellow, the steerable sliced B value of regulation through vacuum control valve 9 aperture.
Hue index contrast table
As can be seen from the above table, the lower the degree of vacuum, the smaller the hue B value (+ yellow-blue), and the apparent improvement in the yellowness of the granulated chips.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (10)
1. A method for increasing whiteness in a bottle chip granulation process is characterized in that: the method for increasing whiteness in the bottle chip granulation process comprises the following steps:
step one, drying regenerated bottle flakes: the aim of drying the regenerated bottle chips is to effectively remove water in the regenerated bottle chips, reduce granulation slice yellowing caused by oxidation reaction of the regenerated bottle chips in the screw melting process, and dry the regenerated bottle chips by adopting continuous fluidized bed drying equipment;
secondly, vacuumizing a screw feeding hole: vacuumizing a screw feeding hole by using a vacuumizing device (2) to pump out oxygen so as to prevent the regenerated bottle flakes from carrying out oxidation reaction on a bottle flake melt by the oxygen in the screw melting process, so that the cut particles have obvious yellow images;
step three, melting the regenerated bottle flake screw: the vacuumized bottle flakes enter a screw extruder (3) for screw melting, the regenerated bottle flake screw is divided into a feeding section, a melting section, a compression section and a mixing section, and eight areas are adopted for independent temperature control to ensure that the regenerated bottle flakes are completely and fully melted;
fourthly, filtering the melt;
fifthly, granulating by a granulator;
the method for increasing the whiteness in the bottle chip granulation process is realized by adopting a system for increasing the whiteness in the bottle chip granulation process, wherein the system for increasing the whiteness in the bottle chip granulation process comprises a regenerated bottle chip drying tower (1), a vacuumizing device (2), a screw extruder (3) and a granulator (4), the regenerated bottle chip drying tower (1) is connected with the vacuumizing device (2), the vacuumizing device (2) is connected with the screw extruder (3), and the screw extruder (3) is connected with the granulator (4).
2. The method for increasing whiteness in a bottle chip granulation process as defined in claim 1, wherein: in the first step, the crystallization temperature is 150-185 ℃, the drying temperature is 150-180 ℃, the dry air flow is 450L/M3, the drying time is 5-8 h, and the water content of the regenerated bottle flakes is controlled to be 50-100 ppm.
3. The method for increasing whiteness in a bottle chip granulation process as defined in claim 1, wherein: in the third step, the process temperature of each zone is 265-300 ℃ in the first zone, 265-300 ℃ in the second zone, 265-300 ℃ in the third zone, 265-300 ℃ in the fourth zone, 265-300 ℃ in the fifth zone, 265-300 ℃ in the sixth zone, 265-290 ℃ in the seventh zone and 265-290 ℃ in the eighth zone.
4. The method for increasing whiteness in a bottle chip granulation process as defined in claim 1, wherein: the vacuum pumping device (2) comprises a jacket layer (5), an air filter (6) and a negative pressure Roots blower (7), the regeneration bottle piece drying tower (1) is connected with the jacket layer (5), the jacket layer (5) is connected with a screw extruder (3), the air filter (6) is connected with the jacket layer (5), and the negative pressure Roots blower (7) is connected with the air filter (6); after the vacuum pumping process is added, air and the bottle chips enter the screw extruder (3) together, so that the oxidation process is reduced in the bottle chip melting process.
5. The method for increasing whiteness in a bottle chip granulation process as defined in claim 4, wherein: the vacuumizing device (2) further comprises a vacuum adjusting pipeline (8) and a vacuum adjusting valve (9), the vacuum adjusting pipeline (8) is connected with the roots pressing fan (7), and the vacuum adjusting valve (9) is installed on the vacuum adjusting pipeline (8); the degree of vacuum pumping of the Roots blower (7) can be reduced under negative pressure by adjusting the opening degree of the vacuum adjusting valve (9), and the lower the degree of vacuum, the more air is pumped out, and the whiter the slice after final granulation is.
6. The method for increasing whiteness in a bottle chip granulation process as defined in claim 4, wherein: the jacket layer (5) comprises a vacuum tube (10), an outer sleeve (11), an inner tube (12) and meshes (13), one end of the vacuum tube (10) is connected with the air filter (6), the other end of the vacuum tube (10) is connected with the outer sleeve (11), the inner tube (12) is sleeved in the outer sleeve (11), the meshes (13) are arranged on the inner tube (12) and the meshes (13) are matched with the vacuum tube (10), one end of the inner tube (12) is connected with the regenerated bottle piece drying tower (1), and the other end of the inner tube (12) is connected with the screw extruder (3).
7. The method for increasing whiteness in a bottle chip granulation process as defined in claim 4, wherein: the air filter (6) comprises a filter shell (14), a filter layer (15), an air inlet pipe (18) and an air outlet pipe (19), the filter layer (15) is installed in the filter shell (14), an air outlet cavity (17) is formed inside the filter layer (15), an air inlet cavity (16) is formed between the inner wall of the filter shell (14) and the outer wall of the filter layer (15), one end of the air inlet pipe (18) is connected with the vacuumizing device (2), the other end of the air inlet pipe (18) is communicated with the air inlet cavity (16), one end of the air outlet pipe (19) is communicated with the air outlet cavity (17), and the other end of the air outlet pipe (19) is connected with the negative-pressure Roots blower (7).
8. The method for increasing whiteness in a bottle chip granulation process as defined in claim 4, wherein: and an exhaust pipe (20) is arranged on the negative pressure Roots blower (7).
9. The method for increasing whiteness in a bottle chip granulation process as defined in claim 6, wherein: the inner diameter of the outer sleeve (11) is larger than the outer diameter of the inner tube (12), a gap is formed between the inner wall of the outer sleeve (11) and the outer wall of the inner tube (12) to enable meshes (13) arranged around the inner tube (12) to be communicated with the vacuum tube (10), and the aperture of each mesh (13) is smaller than the particle size of the bottle flakes to prevent the bottle flakes from passing through the meshes (13); and/or; the distance between two meshes (13) arranged at the uppermost end and the lowermost end of the inner pipe (12) is less than the length of the outer sleeve (11).
10. The method for increasing whiteness in a bottle chip granulation process as defined in claim 7, wherein: the filter layer (15) is made of non-woven fabrics and prevents impurities from being sucked into the negative pressure Roots blower (7) to cause blockage.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115157473A (en) * | 2022-07-06 | 2022-10-11 | 华南农业大学 | Blendor and compounding granulation all-in-one |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115157473A (en) * | 2022-07-06 | 2022-10-11 | 华南农业大学 | Blendor and compounding granulation all-in-one |
| CN115157473B (en) * | 2022-07-06 | 2024-01-23 | 华南农业大学 | Blendor and compounding granulation all-in-one |
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