CN215203385U - Special screw for extruding biaxially oriented polyethylene terephthalate - Google Patents
Special screw for extruding biaxially oriented polyethylene terephthalate Download PDFInfo
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- CN215203385U CN215203385U CN202120678519.0U CN202120678519U CN215203385U CN 215203385 U CN215203385 U CN 215203385U CN 202120678519 U CN202120678519 U CN 202120678519U CN 215203385 U CN215203385 U CN 215203385U
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Abstract
The utility model provides a special screw rod is extruded to biaxial stretching polyethylene terephthalate, including the screw rod, the screw rod divide into the feeding section along length direction in proper order from the feeding to the ejection of compact, separation type compression section, measurement section and mixing section, be equipped with the main screw thread on the screw rod face of cylinder of feeding section, separation type compression section, measurement section along length direction, main screw thread and screw rod shape thread groove and spiral shell arris, wherein the thread groove of feeding section is the same depth, the thread groove depth of separation compression section department becomes shallow gradually to measurement section, add an auxiliary thread that plays the barrier action on separation compression section, the external diameter of auxiliary thread is less than main thread, form solid state district thread groove and melt state district thread groove between auxiliary thread and the main thread, the draw ratio 32 of screw rod is 1 ~ 34: 1. the utility model has the characteristics of structural design is reasonable, the shearing melting is abundant, product quality is good, can make the ethylene terephthalate can carry out abundant shearing melting in the screw rod the inside, makes the transparent no brilliant point of product, and lustrous nature, thickness is even, improves product quality.
Description
Technical Field
The utility model belongs to the technical field of macromolecular material processing machinery, a screw rod structure of extruder is related to, especially, relate to a special screw rod is extruded to biaxial stretching polyethylene terephthalate.
Background
The extruder is used for fully mixing and extruding various particle raw materials and outputting the raw materials, and is mainly used in the field of plastic or rubber manufacturing. When the extruder is in operation, the raw materials are heated to be viscous flow, and under the condition of pressurization, the raw materials are made to pass through a neck mould with a certain shape to form a continuous body with a cross section similar to the shape of the neck mould, then the continuous body is cooled to enable the raw materials with a certain geometric shape and size to be changed from a viscous flow state to a high elastic state, and finally the raw materials are cooled and shaped to be glass state, so that the required product is obtained.
A biaxially oriented polyethylene terephthalate (BOPET) extruder is characterized in that dried polyethylene terephthalate plastic enters a containing cavity between a screw and a machine barrel through a feed opening of the extruder, thrust perpendicular to a bevel face is generated on the plastic through the bevel face rotated by the screw, the plastic is pushed forwards, friction between the plastic and the screw, between the plastic and the machine barrel and friction between particles are generated in the pushing process, meanwhile, the machine barrel is heated to be gradually melted, the melted plastic is extruded into sheets through a metering pump, a die and the like, and then the sheets are longitudinally and transversely stretched into BOPET films. The screw structure of the existing standard extruder is generally a common three-section type (a feeding section, a compression section and a metering section), and one screw edge is formed from the feeding section to the metering section. Because the screw structure is too simple, the biaxially oriented polyethylene terephthalate (BOPET) film formed by extrusion molding has poor transparency, no glossiness, uneven thickness and crystal points on the surface, thereby not only reducing the product quality, but also losing the competitive advantage.
Therefore, a special screw for extruding the biaxially oriented polyethylene terephthalate with good extrusion effect and good product quality needs to be developed.
Disclosure of Invention
The utility model aims to solve the technical problem that the utility model provides a special screw rod is extruded to biaxial stretching polyethylene terephthalate to foretell technical current situation, has that structural design is reasonable, the shearing melting is abundant, product quality is good characteristics.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a special screw rod is extruded to biaxial stretching polyethylene terephthalate, includes the screw rod, its characterized in that: the screw rod is divided into a feeding section, a separation type compression section, a metering section and a mixing section in sequence along the length direction from feeding to discharging, main threads are arranged on the screw rod cylindrical surfaces of the feeding section, the separation type compression section and the metering section along the length direction, the main threads and the screw rod form screw grooves and screw ridges, the screw grooves of the feeding section are equal in depth, the screw groove depth of the separation compression section gradually becomes shallow to the metering section, an auxiliary thread playing a role of a barrier is additionally arranged on the separation compression section, the outer diameter of the auxiliary thread is smaller than that of the main thread, a solid zone screw groove and a molten zone screw groove are formed between the auxiliary thread and the main thread, and the length-diameter ratio of the screw rod is 32: 1-34: 1.
as an improvement, the width of the screw groove in the solid area of the separated compression section gradually becomes narrow, the depth of the screw groove gradually becomes shallow, the width of the screw groove in the molten area gradually becomes wide, the depth of the screw groove gradually becomes shallow, and the depth of the screw groove is connected with the depth of the screw groove in the metering section.
And improving the screw, wherein the length of the separated compression section is greater than that of the metering section and the feeding section, and the length of the separated compression section accounts for 35-40% of the total length of the screw.
Further, the length of the metering section is greater than that of the feeding section, the spiral grooves of the metering section are equal in depth, the length of the metering section accounts for 25-30% of the total length of the screw, and the length of the feeding section accounts for 23-28% of the total length of the screw.
Furthermore, one row or a plurality of rows of pins are arranged on the cylindrical surface of the screw of the mixing section.
And furthermore, the tail end of the mixing section is conical, and the pins are cylindrical or square pins in 5-6 rows.
Finally, the aspect ratio 33 of the screw: 1, the diameter of the screw is phi 80-phi 250 mm.
Compared with the prior art, the utility model has the advantages of: the structure of the screw is reasonably designed, and the screw with the length-diameter ratio of 33:1 is adopted, so that the ethylene terephthalate can be fully melted and plasticized in the screw; the compression section is designed into a separation type compression section, the length of the compression section is larger than that of the feeding section, and an auxiliary thread playing a role of a barrier is additionally arranged on the separation compression section, so that the polyethylene terephthalate plastic is molten under the molten state in the screw rod, and a solution containing small particles of unmelted solid flows to the separation type and is subjected to high shearing to be molten, so that the melting rate is improved; the mixing section is arranged, so that when the molten material flows through the mixing section, shearing heating is generated, and the unmelted material is melted. The utility model has the characteristics of structural design is reasonable, the shearing melting is abundant, product quality is good, can make the ethylene terephthalate can carry out abundant shearing melting in the screw rod the inside, makes the transparent no brilliant point of product, and lustrous nature, thickness is even, improves product quality.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in figure 1, a bidirectional stretching polyethylene terephthalate extrusion special screw comprises a screw 1, the screw 1 is sequentially divided into a feeding section A, a separation type compression section B, a metering section C and a mixing section D along the length direction from feeding to discharging, main threads 2 are arranged on the cylindrical surfaces of the screw 1 of the feeding section A, the separation type compression section B and the metering section C along the length direction, the main threads 2 and the screw 1 form a thread groove and a thread edge, wherein the thread groove of the feeding section A is equal in depth, the thread groove depth at the separation compression section B is gradually reduced to the metering section C, an auxiliary thread 3 playing a barrier role is additionally arranged on the separation compression section S to separate solid plastic and molten plastic, the outer diameter of the auxiliary thread 3 is smaller than that of the main thread 2, a solid zone thread groove 31 and a molten zone thread groove 32 are formed between the auxiliary thread 3 and the main thread 2, the width of the solid zone thread groove 31 is gradually reduced, and the thread groove depth is gradually reduced, the width of the screw groove 32 in the molten state area is gradually widened, the depth of the screw groove is gradually reduced, and then the screw groove is connected with the depth of the screw groove of the metering section C in a flat manner, so that the polyethylene terephthalate plastic is molten under high shear when the molten material containing small particles of unmelted solid flows into a separation type in the molten state in the screw rod, and the melting rate is improved.
5-6 rows of cylindrical or square pins 4 are arranged on the cylindrical surface of the screw 1 of the mixing section D, so that the polyethylene terephthalate plastic is melted in the screw 1 in a molten state, a solution containing small particles of unmelted solid flows to a separation type and is melted by high shear, the melting rate is improved, and the tail end of the mixing section D is conical;
the length of the separation type compression section B is greater than that of the metering section C and that of the feeding section A, and the length of the separation type compression section B accounts for 35-40% of the total length of the screw 1; the length of the metering section C is larger than that of the feeding section A, the spiral groove of the metering section C is equal in depth, the length of the metering section C accounts for 25-30% of the total length of the screw rod 1, and the length of the feeding section A accounts for 23-28% of the total length of the screw rod 1.
In addition, if the length-diameter ratio is too small, the polyethylene terephthalate (BOPET) cannot be sufficiently melted and plasticized in the screw 1, which results in a crystal point of the product, and if the length-diameter ratio is too large, the product is excessively plasticized, so that the length-diameter ratio of the screw 1 of the present embodiment is set to be 33:1, which is reasonable, to ensure that the polyethylene terephthalate (BOPET) can be sufficiently melted and plasticized in the screw 1, and the diameter of the screw 1 is set to be 80 to 250 mm.
The embodiment can enable polyethylene terephthalate (BOPET) to be fully sheared and melted in the screw rod 1 through actual use, so that the product is transparent and has no crystal point, luster and uniform thickness, the product quality is improved, and the production requirement of the biaxially oriented polyethylene terephthalate (BOPET) film extruder can be met.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The utility model provides a special screw rod is extruded to biaxial stretching polyethylene terephthalate, includes the screw rod, its characterized in that: the screw rod is divided into a feeding section, a separation type compression section, a metering section and a mixing section in sequence along the length direction from feeding to discharging, main threads are arranged on the screw rod cylindrical surfaces of the feeding section, the separation type compression section and the metering section along the length direction, the main threads and the screw rod form screw grooves and screw ridges, the screw grooves of the feeding section are equal in depth, the screw groove depth of the separation compression section gradually becomes shallow to the metering section, an auxiliary thread playing a role of a barrier is additionally arranged on the separation compression section, the outer diameter of the auxiliary thread is smaller than that of the main thread, a solid zone screw groove and a molten zone screw groove are formed between the auxiliary thread and the main thread, and the length-diameter ratio of the screw rod is 32: 1-34: 1.
2. the screw dedicated for the extrusion of biaxially oriented polyethylene terephthalate according to claim 1, wherein: the width of the screw groove in the solid area of the separated compression section gradually becomes narrow, the depth of the screw groove gradually becomes shallow, the width of the screw groove in the molten area gradually becomes wide, the depth of the screw groove gradually becomes shallow, and the width of the screw groove is flush with the depth of the screw groove in the metering section.
3. The screw special for extruding the biaxially oriented polyethylene terephthalate as claimed in claim 2, wherein: the length of the separation type compression section is larger than that of the metering section and that of the feeding section, and the length of the separation type compression section accounts for 35-40% of the total length of the screw.
4. The screw dedicated for the extrusion of biaxially oriented polyethylene terephthalate according to claim 3, wherein: the length of the metering section is greater than that of the feeding section, the spiral grooves of the metering section are equal in depth, the length of the metering section accounts for 25-30% of the total length of the screw, and the length of the feeding section accounts for 23-28% of the total length of the screw.
5. The screw dedicated for the extrusion of biaxially oriented polyethylene terephthalate according to any one of claims 1 to 4, wherein: one or more rows of pins are arranged on the cylindrical surface of the screw of the mixing section.
6. The screw special for extruding the biaxially oriented polyethylene terephthalate according to claim 5, wherein: the tail end of the mixing section is conical, and the pins are cylindrical or square pins in 5-6 rows.
7. The screw dedicated for the extrusion of biaxially oriented polyethylene terephthalate according to any one of claims 1 to 4, wherein: the length-diameter ratio of the screw is 33:1, the diameter of the screw is phi 80-phi 250 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120678519.0U CN215203385U (en) | 2021-04-02 | 2021-04-02 | Special screw for extruding biaxially oriented polyethylene terephthalate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120678519.0U CN215203385U (en) | 2021-04-02 | 2021-04-02 | Special screw for extruding biaxially oriented polyethylene terephthalate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215203385U true CN215203385U (en) | 2021-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120678519.0U Active CN215203385U (en) | 2021-04-02 | 2021-04-02 | Special screw for extruding biaxially oriented polyethylene terephthalate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215203385U (en) |
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2021
- 2021-04-02 CN CN202120678519.0U patent/CN215203385U/en active Active
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