CN108687994B - Cold granulating die for producing polypropylene cooling master batch - Google Patents
Cold granulating die for producing polypropylene cooling master batch Download PDFInfo
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- CN108687994B CN108687994B CN201810365151.5A CN201810365151A CN108687994B CN 108687994 B CN108687994 B CN 108687994B CN 201810365151 A CN201810365151 A CN 201810365151A CN 108687994 B CN108687994 B CN 108687994B
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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
- B29B9/065—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion under-water, e.g. underwater pelletizers
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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
- B29C48/30—Extrusion nozzles or dies
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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
- B29C48/30—Extrusion nozzles or dies
- B29C48/302—Extrusion nozzles or dies being adjustable, i.e. having adjustable exit sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
A cold granulating die for producing polypropylene cooling master batch. Mainly aims to provide production equipment which can apply the coextrusion technology to produce the cooling master batch with the coating structure. The method is characterized in that: the cold grain cutting die orifice cover plate is internally provided with a coating melt flow passage, two through holes are communicated with the coating melt flow passage, and the small diameter end of the first through hole is a die hole for producing materials; the coating melt extrusion device also comprises a plurality of core tubes, wherein the core tubes are formed by connecting two sections of a hollow conical section and a hollow straight section, conical-shaped pore canals serving as cooling master batch melt flow passages are arranged in the core tubes, and annular pores can be formed between the small opening ends of the core tubes and the edges of the die holes and serve as extrusion channels of coating melt passing through the coating melt flow passages; the edges of the cold grain cutting die bottom plate and the cold grain cutting die cover plate are provided with corresponding bolt insertion holes for locking the locking bolts after the locking bolts are screwed in. The device can be used for producing the cooling master batch with high stability and coating structure.
Description
Technical Field
The invention relates to die equipment for producing polypropylene cooling master batches.
Background
The polypropylene cooling master batch is also called a polypropylene degradation master batch, and is an additive widely used in plastic processing. The basic functions of the polypropylene melt processing agent are to reduce the molecular weight of polypropylene and increase the fluidity of polypropylene melt, thereby reducing the processing temperature of polypropylene plastic and reducing the consumption of electric energy in the plastic processing process. Meanwhile, the molecular weight distribution of the polypropylene can be narrowed, and the polypropylene can be used in the polypropylene spinning process, so that the spinnability of the polypropylene can be improved, and the polypropylene spinning process is faster and more stable. The conventional polypropylene cooling master batch is prepared from polypropylene serving as a main raw material, a molecular weight regulator and other auxiliary agents through the processes of mixing, extrusion granulation and the like under certain process conditions. The various additives are melt granulated and then homogeneously mixed with the polypropylene matrix, and are substantially homogeneous, sometimes with small amounts of particles of unintentionally created microscopic porosity. However, the existing polypropylene cooling master batch has the following problems: because the molecular weight regulator playing a key role in the cooling master batch is far smaller than the molecular weight of polypropylene, the molecular weight regulator can gradually migrate to the surface of the cooling master batch and volatilize and lose in the storage process, so that the efficiency of the cooling master batch is reduced. Therefore, the efficiency of the cooling master batches with different storage time is different from the production batch to cause instability of the plastic processing process and influence the product quality of the polypropylene plastic product produced by adopting the cooling master batch adding mode.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides the cold-dicing die for producing the polypropylene cooling master batch, and the cooling master batch with the coating structure, which is produced by using the die and adopting the coextrusion technology, has greatly improved performance stability.
The technical scheme of the invention is as follows: the utility model provides a cold grain die orifice for producing polypropylene cooling master batch, includes cold grain die orifice bottom plate and cold grain die orifice apron, and its unique lies in: a coating melt runner is formed in the cold granulating die opening cover plate; a plurality of first through holes and second through holes are respectively formed in the upper part and the lower part of the coating melt flow channel, and the shaft section of each first through hole is in a frustum shape; the first through hole and the second through hole are provided with central axes which are coincident, and two circles with different diameters are respectively formed after the first through hole and the second through hole are communicated with the coating melt flow passage; an internal threaded hole for fixing the core tube is formed in the position, corresponding to the second through hole, of the bottom plate of the cold granulating die; the small diameter end of the first through hole is a die hole for producing materials.
The cold grain cutting die opening further comprises a plurality of core tubes, and the number of the core tubes is the same as that of the first through holes; the core pipe is formed by connecting two sections of a hollow conical section and a hollow straight section, a conical pore canal is arranged in the core pipe, and the conical pore canal is a cooling master batch melt flow channel; the lower half part of the outer wall of the hollow straight pipe section is provided with external threads for being connected with an internal threaded hole on the bottom plate of the cold granulating die orifice, and the cone angle of the hollow cone section is smaller than that of the first through hole, so that a small opening end of a cone-shaped pore canal in the core pipe can form an annular pore with the edge of the die orifice to be used as an extrusion passage of coating melt through a coating melt runner; the upper end of the core tube is positioned in the first through hole, and the upper half part of the outer wall of the hollow straight tube section of the core tube is positioned in the second through hole;
the edges of the cold grain cutting die bottom plate and the cold grain cutting die cover plate are provided with corresponding bolt insertion holes for locking the locking bolts after the locking bolts are screwed in.
In addition, a similar scheme is also presented herein:
a cold grain die orifice for producing polypropylene cooling master batch, includes cold grain die orifice bottom plate and cold grain die orifice improvement apron, and its unique lies in:
the improved cover plate of the cold granulating die is internally provided with a coating melt runner; a plurality of upper through holes and second through holes are respectively formed at the upper part and the lower part of the coating melt flow channel; the upper through hole and the second through hole are provided with central axes which are coincident, and two circles with different diameters are respectively formed after the upper through hole and the second through hole are communicated with the coating melt flow passage; the inner wall of the upper through hole is provided with an internal thread for being in threaded connection with the annular gap adjusting screw.
The cold grain cutting die port further comprises a plurality of annular gap adjusting screws, and the number of the annular gap adjusting screws is the same as that of the upper through holes; the outer wall of the annular gap adjusting screw is provided with an external thread for being in threaded connection with the upper through hole, the inside of the annular gap adjusting screw is provided with a core pipe inserting pore canal with a conical shaft section, and the small diameter end of the core pipe inserting pore canal is a die hole for producing materials.
An internal threaded hole for fixing the core tube is formed in the position, corresponding to the second through hole, of the bottom plate of the cold granulating die;
the cold grain cutting die opening also comprises a plurality of core tubes, and the number of the core tubes is the same as that of the upper through holes; the core pipe is formed by connecting two sections of a hollow conical section and a hollow straight section, a conical pore canal is arranged in the core pipe, and the conical pore canal is a cooling master batch melt flow channel; the lower half part of the outer wall of the hollow straight pipe section is provided with external threads for being connected with an internal threaded hole on the bottom plate of the cold granulating die orifice, and the cone angle of the hollow cone section is smaller than that of the insertion pore canal of the core pipe, so that the small opening end of the cone-shaped pore canal in the core pipe can form an annular pore with the edge of the die orifice to be used as an extrusion channel of coating melt through a coating melt runner; the upper end of the core tube is positioned in the core tube inserting pore canal, and the upper half part of the outer wall of the hollow straight tube section of the core tube is positioned in the second through hole.
The edges of the bottom plate of the cold grain cutting die and the improved cover plate of the cold grain cutting die are provided with corresponding bolt insertion holes for locking the locking bolts after the locking bolts are screwed in.
The two schemes can realize the effect of producing the cooling master batch with the coating structure by using the coextrusion technology.
The invention has the following beneficial effects: the cold granulating die provided by the invention is suitable for the condition of water-cooling bracing granulation, and can produce the cooling master batch with a coating structure. The stability of the cooling master batch is improved due to the coating. In addition, the cold grain cutting die orifice has the advantages of simple structure, few components, convenient processing and manufacturing, convenient disassembly, easy maintenance and lower running and maintenance cost.
Description of the drawings:
fig. 1 is a schematic side plan view of a core tube.
Fig. 2 is a schematic side-bottom view of the core tube.
Fig. 3 is a schematic side top view of an annular gap adjustment screw.
Fig. 4 is a schematic side elevation view of an annular gap adjustment screw.
Fig. 5 is a schematic view of the die structure according to the present invention.
Fig. 6 is a schematic view of the die structure with annular gap adjusting screw according to the present invention.
FIG. 7 is a schematic view of the front face of the bottom plate side of the cold die orifice.
FIG. 8 is a schematic view of the back side of the bottom plate of the cold die.
FIG. 9 is a schematic diagram of a side elevation view of a cold die deck.
FIG. 10 is a schematic view of a side-to-side backside appearance of a cold die orifice cover plate.
FIG. 11 is a schematic diagram of a cold pellet die assembly.
FIG. 12 is a schematic view of the cold pellet die after assembly.
FIG. 13 is a cross-sectional view of the cold die orifice after assembly.
FIG. 14 is a schematic view of the side elevation view of the modified cold die orifice cover plate.
FIG. 15 is a schematic view of the side-to-back appearance of a modified cold die orifice cover plate.
FIG. 16 is a schematic diagram of an improved cold-die assembly.
FIG. 17 is a schematic view of the modified cold pellet die after assembly.
Fig. 18 is a cross-sectional view of the modified cold pellet die after assembly.
In the drawing, a 1-die hole, a 2-core tube, a 3-coating melt runner, a 4-cooling master batch melt runner, a 5-annular gap adjusting screw, a 6-cold granulation die bottom plate, a 7-cold granulation die cover plate, an 8-bolt, a 18-cold granulation die improved cover plate, a 23-internal threaded hole, a 24-second through hole, a 25-first through hole, a 26-core tube inserting pore canal and a 27-upper through hole are formed.
The specific embodiment is as follows:
the invention is further described below with reference to the accompanying drawings:
as shown in fig. 5 in combination with fig. 1, 2 and 7 to 10, a first cold-die for producing polypropylene cooling master batch is provided, comprising a cold-die bottom plate 6 and a cold-die cover plate 7, which is unique in that: a coating melt runner 3 is formed in the cold granulating die cover plate; a plurality of first through holes 25 and second through holes 24 are respectively formed in the upper part and the lower part of the coating melt flow channel, and the axial section of each first through hole 25 is in a frustum shape; the first through hole 25 and the second through hole 24 have coincident central axes, and after the first through hole 25 and the second through hole 24 are communicated with the coating melt flow passage, two circles with different diameters are respectively formed; an internal threaded hole 23 for fixing the core tube is formed in the position, corresponding to the second through hole, on the bottom plate of the cold granulating die; the small diameter end of the first through hole 25 is the die hole 1 for producing materials.
The cold granulating die opening further comprises a plurality of core tubes 2, and the number of the core tubes 2 is the same as that of the first through holes 25; the core pipe 2 is formed by connecting a hollow frustum section and a hollow straight pipe section, and a frustum-shaped pore canal is arranged in the core pipe 2 and is a cooling master batch melt flow channel 4; wherein, the lower half part of the outer wall of the hollow straight pipe section is provided with external threads for being connected with an internal threaded hole on the bottom plate of the cold granulating die, the cone angle of the hollow cone section is smaller than that of the first through hole 25, so that the small mouth end of the cone-shaped pore canal in the core pipe 2 can form an annular pore with the edge of the die hole 1 to be used as an extrusion channel of coating melt through the coating melt flow channel 3; the upper end of the core tube 2 is positioned in the first through hole 25, and the upper half part of the outer wall of the hollow straight tube section of the core tube 2 is positioned in the second through hole 24.
In addition, a positioning groove is arranged on the cold-dicing die bottom plate 6, so that the coaxiality of corresponding pore channels between the cold-dicing die bottom plate 6 and the cold-dicing die cover plate 7 is ensured. The edges of the cold grain cutting die bottom plate 6 and the cold grain cutting die cover plate 7 are provided with corresponding bolt inserting holes for locking the locking bolts 8 after screwing in.
The assembly of the cold-dicing die is shown in fig. 10, 11 and 12, the core tube 2 is fixed on the cold-dicing die bottom plate 6 through threaded connection, and the cold-dicing die cover plate 7 and the cold-dicing die bottom plate 6 are fastened and fixed on the discharge end of the extruder through bolts
As shown in fig. 6 in combination with fig. 1 to 4 and fig. 14 to 15, a second cold-die cut for producing polypropylene cooling master batches is provided.
A cold die orifice for producing polypropylene cooled masterbatch comprising a cold die orifice bottom plate 6 and a cold die orifice modified cover plate 18, which is unique in that:
the improved cover plate of the cold granulating die is internally provided with a coating melt runner 3; a plurality of upper through holes 27 and second through holes 24 are respectively arranged at the upper part and the lower part of the coating melt flow channel; the upper through hole 27 and the second through hole 24 are provided with central axes which are coincident, and two circles with different diameters are respectively formed after the upper through hole 27 and the second through hole 24 are communicated with the coating melt flow passage; the inner wall of the upper through hole 27 is provided with an internal thread for threaded connection with the annular gap adjusting screw.
The cold grain cutting die port further comprises a plurality of annular gap adjusting screws 5, and the number of the annular gap adjusting screws 5 is the same as that of the upper through holes 27; the outer wall of the annular gap adjusting screw 5 is provided with external threads for being in threaded connection with the upper through hole 27, the annular gap adjusting screw 5 is internally provided with a core pipe inserting hole 26 with a conical shaft section, and the small diameter end of the core pipe inserting hole 26 is a die hole 1 for producing materials.
An internal threaded hole 23 for fixing the core pipe is formed in the position, corresponding to the second through hole, of the cold granulation die orifice bottom plate 6.
The cold granulating die opening further comprises a plurality of core tubes 2, and the number of the core tubes 2 is the same as that of the upper through holes 27; the core pipe 2 is formed by connecting a hollow frustum section and a hollow straight pipe section, and a frustum-shaped pore canal is arranged in the core pipe 2 and is a cooling master batch melt flow channel 4; wherein, the lower half part of the outer wall of the hollow straight pipe section is provided with external threads for being connected with an internal threaded hole on the bottom plate 6 of the cold granulating die, the cone angle of the hollow cone section is smaller than the cone angle of the core pipe inserting pore canal 26, so that the small mouth end of the cone-shaped pore canal in the core pipe 2 can form an annular pore with the edge of the die hole 1 as an extrusion channel of the coating melt through the coating melt flow channel 3; the upper end of the core tube 2 is positioned in the core tube insertion hole 26, and the upper half part of the outer wall of the hollow straight tube section of the core tube 2 is positioned in the second through hole 24. The thickness, uniformity and other properties of the cooling master batch coating can be adjusted by adjusting the screwing depth of the annular gap adjusting screw 5 to change the gap size of the annular hole as a coating melt extrusion channel.
The edges of the cold-dicing die bottom plate 6 and the cold-dicing die improved cover plate 18 are provided with corresponding bolt insertion holes for locking the locking bolts 8 after screwing in.
The cold-dicing die bottom plate 6 is provided with a positioning groove, so that the coaxiality of corresponding pore channels between the cold-dicing die bottom plate 6 and the cold-dicing die improved cover plate 18 is ensured.
The assembly of the improved cold-cutting die is shown in fig. 16, 17 and 18, the annular gap adjusting screw is fixed on the cold-cutting die improved cover plate 18 through threaded connection, the core pipe 2 is fixed on the cold-cutting die bottom plate 6 through threaded connection, and the cold-cutting die improved cover plate 18 and the cold-cutting die bottom plate 6 are fastened and fixed on the discharge end of the extruder through bolts.
Examples of the polypropylene cooling master batch prepared by the present invention are given below.
Example 1: the cold grain cutting die with the die hole diameter of 3.5mm is arranged on the main machine head of the plastic extruder, and the coating extruder head is connected with the side hole of the cold grain cutting die hole.
The temperature of the plastic extruder main machine, the coating extruder and the die orifice is respectively set to 145 ℃. After the temperature is stable, the plastic extruder host and the coating extruder are started. Adding conventional cooling master batch into a plastic extruder, and adding polyethylene into a coating extruder as a coating raw material. And controlling the extrusion speed to ensure that the extrusion quantity ratio of the conventional cooling master batch to the coating raw material is 50/1, cooling the material strips extruded from the die opening, and granulating to obtain the cooling master batch with the coating structure. By adjusting the drawing speed and the granulating speed ratio of the granulator, particles with a diameter of about 2mm, a length of 5mm, a coating thickness of about 0.01mm and a coating coverage area of about 83.3% can be obtained.
Example 2: the cold grain cutting die orifice with the die orifice diameter of 4.0mm and adopting the annular gap adjusting screw is arranged on the main machine head of the plastic extruder, and the coating extruder head is connected with the side hole of the cold grain cutting die orifice.
The plastic extruder host 145 ℃, coating extruder and die temperature were set to 135 ℃ respectively. After the temperature is stable, starting the coating extruder, adding polyethylene wax, and adjusting the annular gap adjusting screw to enable the polyethylene wax to be extruded uniformly in the annular gap of each die hole. Starting a host machine of the plastic extruder, and adding conventional cooling master batch. And controlling the extrusion speed to ensure that the extrusion quantity ratio of the conventional cooling master batch to the coating raw material is 50/1, cooling the material strips extruded from the die opening, and granulating to obtain the cooling master batch with the coating structure. By adjusting the drawing speed and the granulating speed ratio of the granulator, particles with a diameter of about 2.5mm, a length of about 7mm, a coating thickness of about 0.013mm and a coating coverage area of about 84.9% can be obtained.
Claims (2)
1. A method for producing polypropylene cooling master batch is characterized in that:
a cold grain cutting die orifice with the diameter of 3.5mm is arranged on the main machine head of the plastic extruder, and the coating extruder head is connected with the side hole of the cold grain cutting die orifice;
respectively setting the temperature of a main machine of a plastic extruder, a coating extruder and a die opening to 145 ℃; after the temperature is stable, starting a plastic extruder host and a coating extruder; adding conventional cooling master batch into a plastic extruder, and adding polyethylene into a coating extruder as a coating raw material; controlling the extrusion speed to ensure that the extrusion quantity ratio of the conventional cooling master batch to the coating raw material is 50/1, cooling the material strips extruded from the die opening, and granulating to prepare the cooling master batch with a coating structure; the particle diameter is about 2mm, the length is 5mm, the coating thickness is about 0.01mm, and the coating coverage area is about 83.3% can be obtained by adjusting the drawing speed and the granulating speed ratio of the granulator;
the cold granulating die comprises a cold granulating die bottom plate (6) and a cold granulating die cover plate (7), and a coating melt flow passage (3) is formed in the cold granulating die cover plate; a plurality of first through holes (25) and second through holes (24) are respectively formed in the upper part and the lower part of the coating melt flow passage, and the shaft section of each first through hole (25) is in a frustum shape; the first through hole (25) and the second through hole (24) are provided with central axes which are coincident, and two circles with different diameters are respectively formed after the first through hole (25) and the second through hole (24) are communicated with the coating melt flow passage; an internal threaded hole (23) for fixing the core tube is formed in the position, corresponding to the second through hole, of the bottom plate of the cold granulating die; the small diameter end of the first through hole (25) is a die hole (1) for producing materials;
the cold granulating die opening further comprises a plurality of core tubes (2), and the number of the core tubes (2) is the same as that of the first through holes (25); the core pipe (2) is formed by connecting two sections of a hollow frustum section and a hollow straight pipe section, a frustum-shaped pore canal is arranged in the core pipe (2), and the frustum-shaped pore canal is a cooling master batch melt flow channel (4); the lower half part of the outer wall of the hollow straight pipe section is provided with external threads for being connected with an internal threaded hole on the bottom plate of the cold granulating die orifice, and the cone angle of the hollow cone section is smaller than that of the first through hole (25), so that a small opening end of a cone-shaped pore canal in the core pipe (2) can form an annular pore with the edge of the die orifice (1) to be used as an extrusion passage of coating melt through the coating melt runner (3); the upper end of the core tube (2) is positioned in the first through hole (25), and the upper half part of the outer wall of the hollow straight tube section of the core tube (2) is positioned in the second through hole (24);
the edges of the cold grain cutting die bottom plate (6) and the cold grain cutting die cover plate (7) are provided with corresponding bolt insertion holes for locking the locking bolts (8) after screwing in.
2. A method for producing polypropylene cooling master batch is characterized in that:
a cold grain cutting die orifice with the diameter of a die orifice of 4.0mm and adopting an annular gap adjusting screw is arranged on a main machine head of a plastic extruder, and the main machine head of a coating extruder is connected with a side hole of the cold grain cutting die orifice;
respectively setting the temperature of a plastic extruder host machine 145 ℃ and a coating extruder and a die orifice to be 135 ℃; after the temperature is stable, starting a coating extruder, adding polyethylene wax, and adjusting an annular gap adjusting screw to ensure that the polyethylene wax can be uniformly extruded in the annular gap of each die hole; starting a host machine of the plastic extruder, and adding conventional cooling master batches; controlling the extrusion speed to ensure that the extrusion quantity ratio of the conventional cooling master batch to the coating raw material is 50/1, cooling the material strips extruded from the die opening, and granulating to prepare the cooling master batch with a coating structure; the particle diameter is about 2.5mm, the length is about 7mm, the coating thickness is about 0.013mm, and the coating coverage area is about 84.9% by adjusting the drawing speed and the granulating speed ratio of the granulator;
the cold-dicing die comprises a cold-dicing die bottom plate (6) and a cold-dicing die improved cover plate (18),
a coating melt runner (3) is arranged in the cold granulating die opening improved cover plate; a plurality of upper through holes (27) and second through holes (24) are respectively arranged at the upper part and the lower part of the coating melt flow passage; the upper through hole (27) and the second through hole (24) are provided with central axes which are coincident, and two circles with different diameters are respectively formed after the upper through hole (27) and the second through hole (24) are communicated with the coating melt flow passage; an inner thread for threaded connection with the annular gap adjusting screw (5) is arranged on the inner wall of the upper through hole (27);
the cold grain cutting die opening further comprises a plurality of annular gap adjusting screws (5), and the number of the annular gap adjusting screws (5) is the same as that of the upper through holes (27); the outer wall of the annular gap adjusting screw (5) is provided with external threads for being in threaded connection with the upper through hole (27), the annular gap adjusting screw (5) is internally provided with a core pipe inserting hole (26) with a conical section, and the small diameter end of the core pipe inserting hole (26) is a die hole (1) for producing materials;
an internal threaded hole (23) for fixing the core tube is formed in the position, corresponding to the second through hole, of the bottom plate of the cold granulating die;
the cold granulating die opening further comprises a plurality of core tubes (2), and the number of the core tubes (2) is the same as that of the upper through holes (27); the core pipe (2) is formed by connecting two sections of a hollow frustum section and a hollow straight pipe section, a frustum-shaped pore canal is arranged in the core pipe (2), and the frustum-shaped pore canal is a cooling master batch melt flow channel (4); the lower half part of the outer wall of the hollow straight pipe section is provided with external threads for being connected with an internal threaded hole on the bottom plate of the cold granulating die orifice, and the cone angle of the hollow cone section is smaller than the cone angle of the core pipe insertion pore canal (26), so that the small opening end of the cone-shaped pore canal in the core pipe (2) can form an annular pore with the edge of the die orifice (1) to be used as an extrusion passage of coating melt through the coating melt flow passage (3); the upper end of the core tube (2) is positioned in the core tube insertion pore channel (26), and the upper half part of the outer wall of the hollow straight tube section of the core tube (2) is positioned in the second through hole (24);
the edges of the cold grain cutting die bottom plate (6) and the cold grain cutting die improved cover plate (18) are provided with corresponding bolt insertion holes for locking the locking bolts (8) after screwing in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810365151.5A CN108687994B (en) | 2018-04-18 | 2018-04-18 | Cold granulating die for producing polypropylene cooling master batch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810365151.5A CN108687994B (en) | 2018-04-18 | 2018-04-18 | Cold granulating die for producing polypropylene cooling master batch |
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| Publication Number | Publication Date |
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| CN108687994A CN108687994A (en) | 2018-10-23 |
| CN108687994B true CN108687994B (en) | 2023-10-03 |
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| CN208484065U (en) * | 2018-04-18 | 2019-02-12 | 大庆海跃达科技有限公司 | For producing the cold palletizing die orifice of polypropylene cooling masterbatch |
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