CN216423401U

CN216423401U - Special double-exhaust type screw for polycarbonate extrusion plate

Info

Publication number: CN216423401U
Application number: CN202120678570.1U
Authority: CN
Inventors: 黄伟红; 庄乾; 王志军
Original assignee: Zhejiang Jinhai Plastic Machinery Co ltd
Current assignee: Zhejiang Jinhai Plastic Machinery Co ltd
Priority date: 2021-04-02
Filing date: 2021-04-02
Publication date: 2022-05-03
Anticipated expiration: 2031-04-02

Abstract

The utility model provides a special double exhaust formula screw rod of panel is extruded to polycarbonate, the screw rod divide into the feeding section in proper order along length direction from the feeding to the ejection of compact, one-order compression section, one-order measurement section, one-order mixing section, double exhaust section, second order compression section, second order measurement section and second order mixing section, two gas vents have been seted up at the double exhaust section relevant position of screw rod to the barrel, the spiral groove depth of double exhaust section is greater than other sections, the spiral arris distance of double exhaust section is less than the spiral arris distance of other sections, screw rod draw ratio 40 ~ 42: 1. the utility model has the characteristics of reasonable structural design and good extrusion effect, can directly add the polycarbonate raw material into an extruder for extrusion, discharges water vapor in the raw material while processing the polycarbonate raw material into a plate, saves the traditional drying and dehydrating process, saves manpower and material resources, and reduces the cost of the product.

Description

Special double-exhaust type screw for polycarbonate extrusion plate

Technical Field

The utility model belongs to the technical field of high polymer material processing machinery, relates to a screw structure of an extruder, and particularly relates to a special-shaped exhaust screw for a polycarbonate extruded plate.

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.

The phi 130/41 polycarbonate ester extruder is characterized in that polycarbonate plastic enters a cavity between a screw and a machine barrel through a feed opening of the extruder, a thrust perpendicular to an inclined arris surface is generated on the plastic through an inclined arris surface rotated by the screw, the plastic is pushed forwards, in the pushing process, due to friction between the plastic and the screw, between the plastic and the machine barrel and friction between particles, the machine barrel is heated to be gradually melted, after secondary exhaust, the melted plastic is extruded through a die, and after three-roller traction, a qualified product is produced. Since the polar water-absorbing ester group of the polycarbonate raw material is hydrolyzed, the aging of the polycarbonate is accelerated, and macromolecules of the polycarbonate are broken, so that the impact strength and the stress cracking resistance of the plate are reduced. Therefore, in order to discharge the water content of the polycarbonate raw material, the conventional method is to put the polycarbonate raw material into a plastic dryer, and dry and dehydrate the polycarbonate raw material for more than 6 to 8 hours to discharge the water content of the polycarbonate raw material. However, the method can greatly increase manpower and material resources and improve the production cost of the product.

According to the traditional Chinese patent CN201310402538.0, a high-efficiency combined screw is characterized in that the screw sequentially comprises a feeding section, a melting section (separation section), a mixing section, a flow limiting section and a metering section, the feeding section adopts a double-thread structure, the melting section is also called as the separation section, a thread is additionally arranged on the melting section of the screw, namely the melting section consists of two threads, and the two threads divide a thread groove formed by the original thread into two thread grooves; the mixing section is of a single-head thread structure, the flow limiting section is provided with a straight groove barrier, and the metering section is of a mixing type structure. The length-diameter ratio of the combined screw is increased, the feeding screw edge of the screw is deeper, the feeding capacity is enhanced, and the yield is increased, but the plasticizing and exhausting effects are not ideal, so that a special exhaust type screw barrel needs to be developed to meet the production requirement of polycarbonate extruded plates.

Disclosure of Invention

The utility model aims to solve the technical problem of providing the special double-exhaust screw rod for the polycarbonate extrusion plate, which has reasonable structural design and good extrusion effect, so that the traditional drying and dehydration process is saved, and the cost is reduced.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a special double exhaust formula screw rod of panel is extruded to polycarbonate, includes screw rod and flight, and the flight sets up along length direction on the screw rod face of cylinder, and the flight forms spiral groove and spiral arris with the screw rod, its characterized in that: the screw rod divide into feeding section, first-order compression section, first-order measurement section, first-order mixing section, two exhaust sections, second order compression section, second order measurement section and second order mixing section along length direction in proper order from the feeding to the ejection of compact, and the barrel has seted up two gas vents at the two exhaust section relevant positions of screw rod, and the thread groove degree of depth of two exhaust sections is greater than other sections, and the pitch of two exhaust sections is less than the pitch of other sections, screw rod draw ratio 40 ~ 42: 1.

as an improvement, the screw grooves of the feeding section are equal in depth, the screw groove depth of the first compression section is gradually reduced to the first metering section, and the screw grooves of the first metering section are equal in depth.

Furthermore, a plurality of longitudinal grooves are formed in two rows of screw cylindrical surfaces of the first-order mixing section and the second-order mixing section at equal intervals.

Furthermore, the spiral groove of the exhaust section is equal in depth, the spiral groove depth of the second-order compression section gradually becomes shallow from the depth to the second-order metering section, and the spiral groove of the second-order metering section is equal in depth.

Furthermore, the exhaust ports are two waist-round ports which are respectively arranged on one side of the machine barrel at intervals in the front-back direction.

Furthermore, the length-diameter ratio of the screw is 41:1, and the diameter of the screw is 120-140 mm.

Furthermore, the pitch of the spiral edges of the feeding section, the first-stage compression section, the first-stage metering section, the second-stage compression section and the second-stage metering section is the same, and the pitch of the spiral edges of the double exhaust sections is 1/3-1/2 of the pitch of the spiral edges of the feeding section.

Finally, the length of each section on the screw is as follows: the feeding section is more than the double exhaust section is more than the second-order metering section is more than the first-order metering section, the first-order compression section is more than the second-order compression section is more than the first-order mixing section and the second-order mixing section.

Compared with the prior art, the utility model has the advantages that: the structure of the screw is reasonably designed, the exhaust section adopts two exhaust ports, and the screw with the length-diameter ratio of 41:1 is adopted, so that the polycarbonate can be fully melted and plasticized in the screw, and the generated gas can be effectively exhausted from the two exhaust ports of the machine barrel through the exhaust section of the screw; setting two compression sections and two metering sections, and setting the depth of the screw groove to ensure that the plastics are plasticized basically after passing through the feeding section, the compression section and the metering section; two mixing sections are arranged, so that the melting is more sufficient. The utility model has the characteristics of reasonable structural design and good extrusion effect, can directly add the polycarbonate raw material into an extruder for extrusion, discharges water vapor in the raw material while processing the polycarbonate raw material into a plate, saves the traditional drying and dehydrating process, saves manpower and material resources, and reduces the cost of the product.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of the barrel;

3 fig. 3 3 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 a 3- 3 a 3 of 3 fig. 3 2 3. 3

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 3, a double exhaust screw dedicated for polycarbonate extruded sheets comprises a screw 1 and a spiral plate 2, wherein the spiral plate 2 is arranged along the length direction on the cylindrical surface of the screw 1, the spiral plate 2 and the screw 1 form a spiral groove and a spiral edge, the screw 1 is sequentially divided into a feeding section a, a first compression section B, a first metering section C, a first mixing section D, a double exhaust section E, a second compression section F, a second metering section G and a second mixing section H along the length direction from feeding to discharging, the spiral groove of the feeding section a is equal in depth, the spiral groove depth of the first compression section B is gradually reduced to the first metering section C, and the spiral groove of the first metering section C is equal in depth; after entering a feeding section A of the screw 1, the polycarbonate raw material generates thrust perpendicular to the inclined arris surface to the plastic through the inclined arris surface rotated by the screw 1, and the plastic is pushed forwards, and in the pushing process, due to friction between the plastic and the screw 1 and between the plastic and the machine barrel 3 and friction between particles, the machine barrel 3 is heated and gradually melted; the screw grooves and the screw grooves of the double exhaust sections E are equal in depth, two exhaust ports 30 are formed in the machine barrel 3 at corresponding positions of the double exhaust sections E of the screw 1, the exhaust ports 30 are two waist-shaped round ports and are respectively arranged on one side of the machine barrel 3 at intervals in the front-back direction; the depth of the spiral groove of the double exhaust section E is greater than that of other sections, the volume is larger, and the pitch of the spiral edges of the double exhaust section E is smaller than that of other sections; because the polycarbonate contains certain humidity, the melted materials contain certain mixed gas, when the melted materials are extruded to the double exhaust section E, the pressure borne by the melted materials is reduced, and the gas contained in the melted materials is pumped out after reaching the two exhaust ports 30; the depth of the screw groove of the second-order compression section F gradually becomes shallow from the depth to the second-order metering section G, the screw groove of the second-order metering section G is equal in depth, and the molten material is further plasticized at the second-order compression section F and the second-order metering section G. The cylindrical surfaces of the screw 1 of the first-order mixing section D and the second-order mixing section H are provided with a plurality of longitudinal grooves 4 in two rows at equal intervals, when the molten material flows through the first-order mixing section D, shearing heating is generated, the unmelted material can be plasticized, and the gas in the molten material is thinned and homogenized through shearing and mixing; when the melt flows through the second-order mixing section H, shearing heat is generated on fine unmelted materials, so that the melt is more uniform. And then extruded under isobaric, equivalent and relatively stable temperature conditions. The pitch of the screw edges of the feeding section A, the first-order compression section B, the first-order metering section C, the second-order compression section F and the second-order metering section G are the same, and the pitch of the screw edges of the double exhaust section E is 1/3-1/2 of the pitch of the screw edges of the feeding section A, so that the structure can ensure that the polycarbonate can be fully compressed and plasticized in the screw 1 and can discharge water vapor.

In addition, the length of each section on the screw 1 of the present embodiment is: a feeding section A, a double exhaust section E, a second-order metering section G, a first-order metering section C, a first-order compression section B, a second-order compression section F, a first-order mixing section D and a second-order mixing section H; screw length-diameter ratio 41:1, the diameter of the screw rod 1 is phi 120-140 mm, the polycarbonate can be fully melted and plasticized in the screw rod 1, the generated gas can be effectively discharged from two exhaust ports 30 of the machine barrel 3 through the double exhaust sections E, the groove depth of the second-order compression section F gradually changes to the second-order metering section G, the groove depth of the second-order metering section G is equal, the melted material is further plasticized at the second-order compression section F and the second-order metering section G, and then the melted material is extruded under the conditions of equal pressure, equal amount and relatively stable temperature.

The specific process is as follows: after entering the feeding section A of the screw 1, the polycarbonate generates a thrust force perpendicular to the inclined arris surface to the plastic through the inclined arris surface rotated by the screw 1, and the plastic is pushed forwards, and in the pushing process, the polycarbonate is gradually melted due to the friction between the plastic and the screw 1 and between the plastic and the machine barrel and the friction between particles, and meanwhile, the machine barrel is heated externally.

The embodiment can directly add the polycarbonate raw material into the extruder for extrusion through actual use, discharges water vapor in the raw material while processing the polycarbonate raw material into a plate, saves the traditional drying and dehydrating process, saves manpower and material resources, and reduces the cost of products.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a special double exhaust formula screw rod of panel is extruded to polycarbonate, includes screw rod and flight, and the flight sets up along length direction on the screw rod face of cylinder, and the flight forms spiral groove and spiral arris with the screw rod, its characterized in that: the screw rod divide into feeding section, first-order compression section, first-order measurement section, first-order mixing section, two exhaust sections, second order compression section, second order measurement section and second order mixing section along length direction in proper order from the feeding to the ejection of compact, and the barrel has seted up two gas vents at the two exhaust section relevant positions of screw rod, and the thread groove degree of depth of two exhaust sections is greater than other sections, and the pitch of two exhaust sections is less than the pitch of other sections, screw rod draw ratio 40 ~ 42: 1.

2. the dedicated dual exhaust screw of claim 1, wherein: the screw grooves of the feeding section are equal in depth, the screw groove depth of the first-stage compression stage gradually becomes shallow to the first-stage metering stage, and the screw grooves of the first-stage metering stage are equal in depth.

3. The dedicated dual exhaust screw of claim 2, wherein: and a plurality of longitudinal grooves are formed in the cylindrical surfaces of the screws of the first-order mixing section and the second-order mixing section in two rows at equal intervals.

4. The dedicated dual exhaust screw of claim 3, wherein: the spiral groove of the exhaust section is equal in depth, the spiral groove depth of the second-order compression section gradually becomes shallow from the depth to the second-order metering section, and the spiral groove of the second-order metering section is equal in depth.

5. The dedicated dual exhaust screw of claim 1, wherein: the exhaust ports are two waist-round ports which are respectively arranged on one side of the machine barrel at intervals in the front-back direction.

6. The dedicated dual exhaust screw according to any one of claims 1 to 5, wherein: the length-diameter ratio of the screw is 41:1, and the diameter of the screw is phi 120-140 mm.

7. The dedicated dual exhaust screw according to any one of claims 1 to 5, wherein: the pitch of the spiral edges of the feeding section, the first-order compression section, the first-order metering section, the second-order compression section and the second-order metering section is the same, and the pitch of the spiral edges of the double exhaust sections is 1/3-1/2 of the pitch of the spiral edges of the feeding section.

8. The dedicated dual exhaust screw according to any one of claims 1 to 5, wherein: the length of each section on the screw is as follows: the feeding section is more than the double exhaust section is more than the second-order metering section is more than the first-order metering section, the first-order compression section is more than the second-order compression section is more than the first-order mixing section and the second-order mixing section.