CN218966103U - Special screw for polyurethane cast film extruder - Google Patents
Special screw for polyurethane cast film extruder Download PDFInfo
- Publication number
- CN218966103U CN218966103U CN202320050219.7U CN202320050219U CN218966103U CN 218966103 U CN218966103 U CN 218966103U CN 202320050219 U CN202320050219 U CN 202320050219U CN 218966103 U CN218966103 U CN 218966103U
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- China
- Prior art keywords
- screw
- section
- grooves
- metering
- polyurethane
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- 229920002635 polyurethane Polymers 0.000 title claims abstract description 34
- 239000004814 polyurethane Substances 0.000 title claims abstract description 34
- 230000006835 compression Effects 0.000 claims abstract description 17
- 238000007906 compression Methods 0.000 claims abstract description 17
- 230000004888 barrier function Effects 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 238000007766 curtain coating Methods 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 5
- 229920003023 plastic Polymers 0.000 abstract description 26
- 239000004033 plastic Substances 0.000 abstract description 26
- 238000005266 casting Methods 0.000 abstract description 6
- 239000013078 crystal Substances 0.000 abstract description 5
- 238000010008 shearing Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 239000002932 luster Substances 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 10
- 239000007787 solid Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The utility model provides a special screw rod of polyurethane curtain coating film extruder, includes screw rod, its characterized in that: the screw rod is sequentially divided into a feeding section, a compression section, a first metering section, a barrier section, a second metering section and a mixing section along the length direction from feeding to discharging, screw threads are arranged on screw rod cylindrical surfaces of the feeding section, the compression section, the first metering section and the second metering section along the length direction, the screw threads and the screw rods form screw grooves and screw edges, the screw grooves and the screw edges are formed by the screw threads, the screw grooves and the screw edges are identical in screw edge screw pitch, the length of the compression section is larger than that of the feeding section, the screw grooves and the screw grooves are gradually shallower in the screw edge screw pitch, the screw groove and the screw grooves are leveled in depth ratio of the screw rods is 29:1-31:1, and the screw rod diameter phi is 55-phi 180mm. The utility model has the characteristics of reasonable structural design, sufficient shearing and melting and high plasticizing rate, can enable polyurethane plastics to be sufficiently sheared and melted in the screw, ensures that the polyurethane casting film has high transparency, no crystal point, luster and uniform thickness, and improves the product quality.
Description
Technical Field
The utility model belongs to the technical field of high polymer material processing machinery, relates to a screw structure, and particularly relates to a special screw for a polyurethane casting film extruder.
Background
The extruder is used for fully mixing and extruding one or more granular plastics and outputting the mixture. The polyurethane casting film extruder is characterized in that polyurethane plastic enters a containing cavity between a screw and a machine barrel through a feed opening of the extruder, a bevel surface rotating through the screw generates thrust vertical to the bevel surface to the plastic, the plastic is pushed forward, friction between the plastic and the screw and friction between the plastic and the machine barrel and particles are generated in the pushing process, the exterior of the machine barrel is heated to be gradually melted, and the melted plastic is extruded and molded through a die and the like. If the screw structure is too simple or unreasonable, the polyurethane cast film has poor transparency, no glossiness, uneven thickness and crystal points on the surface. Therefore, the quality of the product is reduced, the qualification rate of the product is affected, and the competitive advantage is lost.
The screw structure of the existing standard extruder is generally of a common three-section type (a feeding section, a compression section and a metering section), and a lot of patents are related to the extruder screw at present, such as China patent No. CN201720540639.8, a special machine barrel screw for PET plastic injection molding machines, and the like, but the screw of a polyurethane casting film extruder is not reported yet.
Therefore, a special screw for a polyurethane cast film extruder needs to be designed to meet the requirement of extrusion of the polyurethane cast film.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a special screw for a polyurethane cast film extruder aiming at the technical state of the art, and has the characteristics of reasonable structural design, high transparency, luster and uniform thickness of the cast film.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a special screw rod of polyurethane curtain coating film extruder, includes screw rod, its characterized in that: the screw rod is sequentially divided into a feeding section, a compression section, a first metering section, a barrier section, a second metering section and a mixing section along the length direction from feeding to discharging, screw threads are arranged on screw rod cylindrical surfaces of the feeding section, the compression section, the first metering section and the second metering section along the length direction, the screw threads and the screw rods form screw grooves and screw edges, the screw grooves and the screw edges are formed by the screw threads, the screw grooves and the screw edges are identical in screw edge screw pitch, the length of the compression section is larger than that of the feeding section, the screw grooves and the screw grooves are gradually shallower in the screw edge screw pitch, the screw groove and the screw grooves are leveled in depth ratio of the screw rods is 29:1-31:1, and the screw rod diameter phi is 55-phi 180mm.
As an improvement, the screw pitch of the screw edges of the first metering section and the second metering section is the same, the screw depths are the same, and the length of the second metering section is larger than that of the first metering section.
Further, a plurality of longitudinal grooves are formed in the cylindrical surface of the screw rod of the barrier section at equal intervals, and the longitudinal grooves are divided into two groups: one group is a feed chute, the outlet of which is closed in the axial direction, the other group is a discharge chute, and the inlet of which is closed in the axial direction; the feed chute and the discharge chute are arranged alternately, the outer diameter of a thread between the feed chute and the discharge chute is smaller than the diameter of a screw rod, and materials flow into the discharge chute from the feed chute through the smaller outer diameter of the thread.
Further, one or more rows of pins are arranged on the cylindrical surface of the screw rod of the mixing section.
Still further, the pins are 3-5 rows of cylindrical or square pins.
Further, the length of the compression section > the second metering section > the feed section > the first metering section.
Finally, the aspect ratio of the screw is 30:1.
Compared with the prior art, the utility model has the advantages that: the structure of the screw is reasonably designed and optimized, and the screw with the length-diameter ratio of 30:1 is adopted, so that the polyurethane plastic can be fully melted and plasticized in the screw; the compression section is formed by gradually shallower the screw groove depth with the same screw pitch as the screw groove depth of the first measuring section and is leveled with the screw groove depth of the first measuring section, so that the polyurethane plastic is gradually melted by heating the outside of the machine barrel during the pushing process due to friction between the plastic and the screw rod and friction between the plastic and the machine barrel and between particles; two metering sections are arranged to ensure that polyurethane plastics can be fully melted and plasticized in the screw; the mixing section is arranged, so that a solvent containing unmelted solid small particles is sheared when flowing into the barrier section, a large amount of mechanical energy is changed into heat energy, the unmelted solid small particles are melted, and the plastic plasticizing uniformity is improved; the barrier section is arranged, so that the polyurethane plastic is sheared when a solution containing unmelted solid small particles flows into the barrier section in a molten state in the screw, and a large amount of mechanical energy is changed into heat energy, so that the unmelted solid small particles are melted and mixed. The utility model has the characteristics of reasonable structural design, sufficient shearing and melting and high plasticizing rate, can enable polyurethane plastics to be sufficiently sheared and melted in the screw, ensures that the polyurethane casting film has high transparency, no crystal point, luster and uniform thickness, and improves the product quality.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present utility model.
Detailed Description
The utility model is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1, the special screw for the polyurethane casting film extruder comprises a screw 1, wherein the screw 1 is sequentially divided into a feeding section A, a compression section B, a first metering section C, a barrier section D, a second metering section E and a mixing section F along the length direction from feeding to discharging, threads 2 are arranged on cylindrical surfaces of the screw 1 of the feeding section A, the compression section B, the first metering section C and the second metering section E along the length direction, the threads 2 and the screw 1 form screw grooves 2.2 and screw edges 2.1, the length of the compression section B is more than that of the second metering section E and more than that of the feeding section A and more than that of the first metering section C. The feeding section A is provided with screw grooves with the same screw pitch and the same screw groove depth, and polyurethane plastic particles enter the feeding hole of the machine barrel and then generate thrust vertical to the inclined surface through the inclined surface rotated by the screw of the feeding section A to push the plastic forwards. The compression section B is formed by gradually shallower the screw groove depth with the same screw pitch and the first metering section C, so that the polyurethane plastic is gradually melted in the pushing process due to friction between the plastic and the screw 1, friction between the plastic and the machine barrel and friction between particles caused by gradually shallower the screw groove depth, and meanwhile, the machine barrel is externally heated. The screw pitch of the screw edges of the first metering section C and the second metering section E is the same, and the depths of screw grooves are the same, so that the polyurethane plastics can be fully melted and plasticized in the screw 1. A plurality of longitudinal grooves 4 are equidistantly formed in the cylindrical surface of the screw 1 of the barrier section D, and the longitudinal grooves 4 are divided into two groups: one group is a feed chute 4.1, the outlet of which is closed in the axial direction, and the other group is a discharge chute 4.2, the inlet of which is closed in the axial direction; the feed chute 4.1 and the discharge chute 4.2 are arranged alternately, the thread outer diameter between the feed chute 4.1 and the discharge chute 4.2 is smaller than the diameter of the screw rod 1, and materials flow into the discharge chute 4.2 from the feed chute 4.1 through the smaller thread outer diameter. The polyurethane plastic is subjected to shearing action when a solution containing unmelted solid small particles flows into a barrier section in a molten state in the screw, and a large amount of mechanical energy is changed into heat energy to melt the unmelted solid small particles. The cylindrical surface of the screw 1 of the mixing section F is provided with one or more rows of pins 3, and the pins 5 are 3-4 rows of cylindrical or square pins. When the melted material flows through the mixing section F, shearing heat is generated, and unmelted material can be plasticized.
The length-diameter ratio of the screw 1 of the embodiment is 30:1, and the diameter phi of the screw is 55-180 mm. Ensures that polyurethane plastic can be fully melted and plasticized in the screw 1, has too small length-diameter ratio, and cannot be fully melted and plasticized in the screw 1, so that the product has crystal points.
Through actual use, the polyurethane plastic can be sufficiently sheared and melted in the screw 1, so that the bottle blowing product is transparent, has no crystal point, has glossiness and uniform thickness, has no air holes, and effectively improves the product quality.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.
Claims (7)
1. The utility model provides a special screw rod of polyurethane curtain coating film extruder, includes screw rod, its characterized in that: the screw rod is sequentially divided into a feeding section, a compression section, a first metering section, a barrier section, a second metering section and a mixing section along the length direction from feeding to discharging, screw threads are arranged on screw rod cylindrical surfaces of the feeding section, the compression section, the first metering section and the second metering section along the length direction, the screw threads and the screw rods form screw grooves and screw edges, the screw grooves and the screw edges are formed by the screw threads, the screw grooves and the screw edges are identical in screw edge screw pitch, the length of the compression section is larger than that of the feeding section, the screw grooves and the screw grooves are gradually shallower in the screw edge screw pitch, the screw groove and the screw grooves are leveled in depth ratio of the screw rods is 29:1-31:1, and the screw rod diameter phi is 55-phi 180mm.
2. The special screw for a polyurethane cast film extruder according to claim 1, wherein: the screw pitch of the screw edges of the first metering section and the second metering section is the same, the screw depths of the screw edges are the same, and the length of the second metering section is greater than that of the first metering section.
3. The special screw for a polyurethane cast film extruder according to claim 1, wherein: a plurality of longitudinal grooves are formed in the cylindrical surface of the screw rod of the barrier section at equal intervals, and the longitudinal grooves are divided into two groups: one group is a feed chute, the outlet of which is closed in the axial direction, the other group is a discharge chute, and the inlet of which is closed in the axial direction; the feed chute and the discharge chute are arranged alternately, the outer diameter of a thread between the feed chute and the discharge chute is smaller than the diameter of a screw rod, and materials flow into the discharge chute from the feed chute through the outer diameter of the thread.
4. The special screw for a polyurethane cast film extruder according to claim 1, wherein: and one or more rows of pins are arranged on the cylindrical surface of the screw rod of the mixing section.
5. The special screw for a polyurethane cast film extruder according to claim 4, wherein: the pins are 3-5 rows of cylindrical or square pins.
6. The special screw for a polyurethane cast film extruder according to any one of claims 1 to 5, wherein: the length of the compression section is larger than that of the second metering section, and the length of the feeding section is larger than that of the first metering section.
7. The special screw for a polyurethane cast film extruder according to any one of claims 1 to 5, wherein: the length-diameter ratio of the screw is 30:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320050219.7U CN218966103U (en) | 2023-01-09 | 2023-01-09 | Special screw for polyurethane cast film extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320050219.7U CN218966103U (en) | 2023-01-09 | 2023-01-09 | Special screw for polyurethane cast film extruder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218966103U true CN218966103U (en) | 2023-05-05 |
Family
ID=86151359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320050219.7U Active CN218966103U (en) | 2023-01-09 | 2023-01-09 | Special screw for polyurethane cast film extruder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218966103U (en) |
-
2023
- 2023-01-09 CN CN202320050219.7U patent/CN218966103U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |