CN203110302U - Screw assembly of double-screw extruder and double-screw extruder - Google Patents

Screw assembly of double-screw extruder and double-screw extruder Download PDF

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Publication number
CN203110302U
CN203110302U CN2012204304055U CN201220430405U CN203110302U CN 203110302 U CN203110302 U CN 203110302U CN 2012204304055 U CN2012204304055 U CN 2012204304055U CN 201220430405 U CN201220430405 U CN 201220430405U CN 203110302 U CN203110302 U CN 203110302U
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CN
China
Prior art keywords
arbor assembly
screw
screw extruder
section
melt
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Expired - Lifetime
Application number
CN2012204304055U
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Chinese (zh)
Inventor
宫清
周维
伍伯林
宋宇
黄江
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Huizhou BYD Electronic Co Ltd
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Huizhou BYD Electronic Co Ltd
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Priority to CN2012204304055U priority Critical patent/CN203110302U/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50Details of extruders
    • B29C48/505Screws
    • B29C48/57Screws provided with kneading disc-like elements, e.g. with oval-shaped elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/365Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pumps, e.g. piston pumps
    • B29C48/37Gear pumps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50Details of extruders
    • B29C48/505Screws
    • B29C48/53Screws having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50Details of extruders
    • B29C48/505Screws
    • B29C48/54Screws with additional forward-feeding elements

Abstract

The utility model provides a screw assembly of a double-screw extruder and the double-screw extruder. The screw assembly of the double-screw extruder comprises screws, wherein each screw sequentially comprises a charging section, a fusing section, a homogenizing section and a conveying section; and the tail part of the conveying section comprises a speaking trumpet with a gradually increasing diameter. By using the screw assembly of the double-screw extruder, the production speed of the double-screw extruder can be accelerated, and the production yield of prepared EVA (Ethylene vinyl-acetate) films is high.

Description

Double screw extruder screw arbor assembly and double screw extruder
Technical field
The utility model relates to the extruder technology field, and particularly double screw extruder technical field specifically refers to a kind of double screw extruder screw arbor assembly and double screw extruder of ethylene-vinyl acetate photovoltaic encapsulating film.
Background technology
Ethylene-vinyl acetate (EVA) co-polymer membrane is solar cell photovoltaic encapsulating film commonly used, the vinyl acetate content of ethylene-vinyl acetate (EVA) is 25 ~ 45%, melt index is between 22-400, development along with the green generating, it also reaches extensive use, but the extruded film linear velocity of existing double screw extruder for the production of ethylene-vinyl acetate (EVA) photovoltaic encapsulating film is lower, generally be lower than 5m/min, when starting up speed when 5m/min is above, the production yield reduces, the yield of film can only reach about 80%, and also can occur the point of more cross-linking agent in film, may directly whole film be scrapped, have only by the control line speed between 2.5-5m/min, the production yield is reached more than 97%, make it meet production requirement, but the production cost of EVA film is high.
The double screw extruder screw arbor assembly is the core component of double screw extruder, it also is the place that EVA finishes the fusion homogenizing, it plays control action to the linear velocity of producing, referring to shown in Figure 1, the diameter homogeneous of existing double screw extruder screw arbor assembly, be connected with Melt Pump, the EVA melt Conveying during to Melt Pump pressure certain, lacking enough melt source causes line speed not improve to produce on the line efficient low, phenomenon completely appears not plastifying in following melt often, and product quality can not get effective assurance.Screw rod in the double screw extruder screw arbor assembly generally is made up of for 23 3 sections feeding section 21, melt zone 22, homogenizing zone simultaneously, be prone to much not fusant or cross-linking agent, and have only 8 joint screw thread composition elements 20 altogether, the plasticizing process stroke of melt is short, causes speed of production lowly can't replenish melt.And general feeding section 11 is by 56/56,96/96,96/96,96/96,96/96 screwing element is formed, melt zone 22 is by 56/56,56/56,56/56,45 °/5/36,56/56,56/56,56/56,56/56,56/56,45 °/5/36,56/56,56/56,56/56,72/72,72/72,56/56,56/56,56/56,45 °/5/36 screwing element is formed, homogenizing zone 23 is by 56/56,56/56,56/56,56/56,56/56,45 °/5/36,72/72,72/72,72/72,72/72,72/72,72/72,72/72 screwing element is formed, the total kneading disc number that contains 3 shearing elements, 6 shearing elements 6 in the melt zone 22 is 15, shearing to raw material is incomplete, very easily produce not fusant and enter homogenizing zone 23, cause the bad of product, the conveying helical pitch of delivery element 5 is for being 56mm and 72mm in the melt zone 22, helical pitch is long, under high-speed stirred, easily take place crosslinked, can cause melt can not evenly be transported to homogenizing zone 23, the conveying helical pitch of delivery element 5 is 56mm in the homogenizing zone 23,72mm and contain shearing elements 6 simultaneously, easily generation is crosslinked exists influence to carrying, and makes screw rod seriously restrict the speed of production of extruder.
The utility model content
The purpose of this utility model is the slow shortcoming of speed of production in order to overcome double screw extruder of the prior art and to produce the higher EVA film of yield, provides a kind of and can improve the speed of production of double screw extruder and the EVA film of preparation is produced high double screw extruder screw arbor assembly and the double screw extruder of yield.
First purpose of the present utility model provides a kind of double screw extruder screw arbor assembly, comprises screw rod, and this screw rod is made up of feeding section, melt zone, homogenizing zone and transportation section successively, and wherein, the afterbody of transportation section contains cone.
Preferably, the length of described cone is 4:1 with the ratio of maximum gauge, and maximum gauge is 125-75mm.
Preferably, the initial part that the transportation section is connected with homogenizing zone comprises delivery element, and described homogenizing zone comprises delivery element, and the conveying helical pitch of the delivery element of described transportation section is than the big 40mm of conveying helical pitch of the delivery element of homogenizing zone.
Preferably, screw rod is made up of 9 joint screw thread composition elements, and every joint screw thread composition element cylindrical shell is that draw ratio is 36:1.
Preferably, feeding section is made up of 2 joint screw thread composition elements, and described melt zone is made up of 3 joint screw thread composition elements, and described homogenizing zone is made up of 2 joint screw thread composition elements, described transportation section is made up of 2 joint screw thread composition elements, and the draw ratio of every joint screw thread composition element is 4:1.
Preferably, melt zone comprises some delivery elements and the some shearing elements that is interspersed, and total kneading disc number of shearing elements is greater than 15; The conveying helical pitch of the delivery element of described melt zone is 96-44mm.
So-called " being interspersed " refers to one or several delivery element and one or several shearing elements is alternately arranged successively, such as, 3 delivery element+1 shearing elements+1 delivery element+2 shearing elements+...; Perhaps 2 shearing elements+3 delivery elements+3 shearing elements+1 delivery element+3 shearing elements+..., etc., arrange as required.
Preferably, homogenizing zone comprises some delivery elements, and the conveying helical pitch of the delivery element of described homogenizing zone is 96-44mm.
Preferably, feeding section comprises some delivery elements, and the conveying helical pitch of the delivery element of described feeding section is 96-44mm.
Preferably, the initial part that the transportation section is connected with homogenizing zone comprises delivery element, and the conveying helical pitch of the delivery element of described transportation section is 116-44mm.
Preferably, feeding section is connected by 56/56,96/96,96/96,96/96,96/96 screwing element keyway successively; Melt zone is connected by 72/72,72/72,72/72,45 °/5/56,45 °/5/56,72/72,72/72,72/72,45 °/5/36,72/72,72/72,72/72,45 °/5/36 screwing element keyway successively; Homogenizing zone is connected by 72/72,72/72,56/56,56/56,56/56,56/56,56/56,56/56,56/56,56/56,56/56,56/56,56/56,72/72 screwing element keyway successively; The transportation section is connected by the cone that 72/72,72/72,96/96,96/130 screwing element and maximum gauge are 125-75mm successively.
Preferably, the length of feeding section is that the length of 440-88mm, melt zone is that the length of 1036-440mm, homogenizing zone is that the length of 1036-440mm, transportation section is 440-88mm.
Second purpose of the present utility model provides a kind of double screw extruder, comprise the charging mechanism that is connected with screw arbor assembly in the material adding screw arbor assembly, screw arbor assembly successively, export the Melt Pump that is connected with screw arbor assembly and be connected the mold that is used for extruded film with Melt Pump for the melt of the screw arbor assembly of will flowing through, wherein, screw arbor assembly is above-mentioned double screw extruder screw arbor assembly.
Preferably, screw arbor assembly comprises that also being positioned at feeding section shearing section before shears section feeding section before with being positioned at.
Preferably, feeding section is connected by 72/72,72/72,96/96,96/130 screwing element keyway successively; The described section of shearing is connected by 45 °/5/56,45 °/5/56,45 °/5/36 screwing element keyway successively.
The beneficial effect of utility model specifically is: by increasing the transportation section, increase the homogenizing time of EVA and store melt, can offer the enough melts of Melt Pump, can improve the extruded velocity that produces line, the afterbody of transportation section contains the cone that diameter increases simultaneously, can increase the back pressure in the double screw extruder screw arbor assembly machine barrel, makes the melt amount that enters Melt Pump enough, guarantee the constant pressure of melt, can improve the line speed of extruder.Further by changing the screw thread combination, by rational helical pitch and length, make the EVA resin of each humidity province in the screw rod such as feeding section, melt zone, homogenizing zone, transportation section reach best molten condition, make the melt that is plastified to have time enough to obtain best melt in suitable temperature range and enter Melt Pump and extrude the encapsulating film that obtains high-quality by the die head body.Total kneading disc number of the shearing elements of melt zone is greater than 15 simultaneously, shear rate is fast, the delivery element of melt zone carries helical pitch short, during high-speed stirred, mass transport is fast, it is crosslinked can not make that material occurs in cylindrical shell because of strong shearing and stirring, and fraction defective occurs, more can realize film processed at a high speed.The line speed of EVA film can reach 10-30m/min on the double screw extruder of the present utility model.
Description of drawings
Fig. 1 is the main TV structure schematic diagram of existing double screw extruder screw arbor assembly.
Fig. 2 is the main TV structure schematic diagram of the double screw extruder screw arbor assembly of a kind of embodiment of the present utility model.
Fig. 3 is the structural representation of the double screw extruder of a kind of embodiment of the present utility model.
Fig. 4 is a kind of main TV structure schematic diagram of delivery element.
Fig. 5 is the main TV structure schematic diagram of another kind of delivery element.
Fig. 6 is the main TV structure schematic diagram of another kind of delivery element.
Fig. 7 is the main TV structure schematic diagram of another kind of delivery element.
Fig. 8 is a kind of main TV structure schematic diagram of shearing elements.
Fig. 9 is the main TV structure schematic diagram of another kind of shearing elements.
The specific embodiment
In order more to be expressly understood technology contents of the present utility model, describe in detail especially exemplified by following examples.Should be understood that embodiment only is for explanation the utility model, rather than to restriction of the present utility model.Wherein identical parts adopt identical Reference numeral.
Referring to shown in Figure 3, double screw extruder of the present utility model comprises the charging mechanism 1 that is connected with screw arbor assembly 2 in the material adding screw arbor assembly 2, screw arbor assembly 2 successively, exports the Melt Pump 3 that is connected with screw arbor assembly 2 and be connected the mold 4 that is used for extruded film with Melt Pump 3 for the melt of the screw arbor assembly 2 of will flowing through.
Improvements of the present utility model are screw arbor assembly 2, make the melt that is plastified can have the suitable time to enter Melt Pump at the suitable best melt of temperature range acquisition when high-speed stirred is exported and extrude the encapsulating film that obtains high-quality by the die head body.
Referring to shown in Figure 2, double screw extruder screw arbor assembly 2 of the present utility model comprises screw rod, and this screw rod is made up of feeding section 21, melt zone 22, homogenizing zone 23 and transportation section 24 successively.One of improvement place of the present utility model is that screw rod saves screw thread composition elements 20 by 9 and forms, can make melt obtain certain storage and set up back pressure, thereby improve the linear speed of extruding, wherein, every joint screw thread composition element is that draw ratio is same under the 4:1(), every joint screw thread composition element is cellular construction, and itself and cylindrical shell are formed the joint building blocks of a joint device assembles, and then the draw ratio of the preferred screw rod of the present invention is 36:1.
One of improvement place of the present utility model is feeding section 21, and feeding section 21 comprises some delivery elements 5, and raw material can be evenly distributed in the screw channel after by this section and form uniform state.The throughput direction of delivery element 5 can be the same or different, in specific embodiment of the utility model, and the throughput direction unanimity of delivery element 5.Under the preferable situation, the conveying helical pitch of the delivery element 5 of feeding section 21 is 96-44mm, further raw material is evenly distributed in and forms uniform state in the screw channel.In specific embodiment of the utility model, preferred delivery element 5 can be the screwing element (seeing also shown in Fig. 6) of 56/56 (seeing also shown in Fig. 4) and 96/96, wherein, 56/56 screwing element represents the screwing element that helical pitch and reach are 56mm; 96/96 screwing element represents the screwing element that helical pitch and reach are 96mm.In specific embodiment of the utility model, connect to form the feeding section 21 of screw rod successively by 56/56,96/96,96/96,96/96,96/96 screwing element keyway.In specific embodiment of the utility model, feeding section 21 is made up of 2 joint screw thread composition elements 20.The length of the preferred feeding section 21 of the utility model is 440-88mm, is specially 440mm in the present embodiment.
One of improvement place of the present utility model is melt zone 22, melt zone 22 comprises some delivery elements 5 and the some shearing elements 6 that is interspersed, in specific embodiment of the utility model, adopted a shearing elements 6+3 delivery element 5+1 shearing elements 6 of 2 shearing elements 5+3 of 3 delivery element 5+ delivery element 5+1, raw material enters uniform mixed melting after this section is by continuous shearing, thereby reaches the state of fine melt.Total kneading disc number of the shearing elements 6 of melt zone 22 of the present utility model is greater than 15, shear rate is fast, preferably just two shearing elements 6 connect use, shear continuously, can make more refinement of feed particles, what melt is faster, the throughput direction of each shearing elements 6, mediate the disc number, the kneading disk angle, helical pitch length can be the same or different, in specific embodiment of the utility model, 4 shearing elements 6 have been adopted, be specially 2 45 °/5/36 screwing elements (seeing also shown in Fig. 8) and 2 45 °/5/56 screwing elements (seeing also shown in Fig. 9), wherein, 45 °/5/36 screwing element represents that the kneading disk angle is 45 °, 5 kneading disks, and helical pitch length is the screwing element of 36mm; 45 °/5/56 screwing element represents that the kneading disk angle is 45 °, 5 kneading disks, and helical pitch length is the screwing element of 56mm.Preferably, the conveying helical pitch of the delivery element 5 of melt zone 22 is 96-44mm, and transporting velocity is fast, prevent that the reinforcement of shearing is to the influence of material, the reinforcement of Jian Qieing simultaneously also makes the time of fusion shorten, and has improved the efficient of fusion, carries and has also improved line speed soon.In specific embodiment of the utility model, the delivery element 5 of preferred molten section 22 can be 72/72 screwing element (seeing also shown in Fig. 5), and wherein, 72/72 screwing element represents the screwing element that helical pitch and reach are 72mm.In specific embodiment of the utility model, connect to form the melt zone 22 of screw rod successively by 72/72,72/72,72/72,45 °/5/56,45 °/5/56,72/72,72/72,72/72,45 °/5/36,72/72,72/72,72/72,45 °/5/36 screwing element keyway.In specific embodiment of the utility model, melt zone 22 is made up of 3 joint screw thread composition elements 20.The draw ratio of the utility model preferred molten section 22 is 4:1, is specially 4:1 in the present embodiment.The length of the utility model preferred molten section 22 is 1036-440mm, and more preferably 832-760mm is specially 832mm in the present embodiment.
One of improvement place of the present utility model is homogenizing zone 23, and homogenizing zone 23 comprises some delivery elements 5, and raw material can plastify uniformly in this section.The throughput direction of delivery element 5 can be the same or different, in specific embodiment of the utility model, and the throughput direction unanimity of delivery element 5.Under the preferable situation, the conveying helical pitch of the delivery element 5 of homogenizing zone 23 is 96-44mm, strengthens stroke.In specific embodiment of the utility model, the delivery element 5 of homogenizing zone 23 can be the screwing element of 56/56 (seeing also shown in Fig. 4) and 72/72 (seeing also shown in Fig. 5), wherein, 56/56 screwing element represents the screwing element that helical pitch and reach are 56mm; 72/72 screwing element represents the screwing element that helical pitch and reach are 72mm.In specific embodiment of the utility model, connect to form the homogenizing zone 23 of screw rod successively by 72/72,72/72,56/56,56/56,56/56,56/56,56/56,56/56,56/56,56/56,56/56,56/56,56/56,72/72 screwing element keyway.In specific embodiment of the utility model, homogenizing zone 23 is made up of 2 joint screw thread composition elements 20.The length of the preferred homogenizing zone 23 of the utility model is more preferably 820-370mm of 1036-440mm, further is preferably 760-370mm, is specially 760mm in the present embodiment.
One of improvement place of the present utility model is to increase transportation section 24, raw material can increase the homogenizing time of EVA at this section, the transportation section can store melt simultaneously, can provide enough melts to Melt Pump, improve the extruded velocity that produces line, the afterbody of transportation section contains cone simultaneously, the diameter of cone increases gradually, the macropore that is cone is positioned at afterbody, can increase the back pressure in the double screw extruder screw arbor assembly machine barrel, make to enter Melt Pump enough melts are arranged, the constant pressure of melt can improve the line speed of extruder.Wherein, the initial part that transportation section 24 is connected with homogenizing zone is that head comprises delivery element 5, afterbody contains the cone 241 that diameter increases, under the preferable situation, the draw ratio 4:1 of cone 241, maximum gauge are 125-75mm, preferably than the big 40-30mm of diameter of transportation section head, in specific embodiment of the utility model, the length of cone 241 is 4:1 with the ratio of maximum gauge, and maximum gauge is specially 115mm.Wherein, the throughput direction of the delivery element 5 of the transportation section of head can be the same or different, in specific embodiment of the utility model, and the throughput direction unanimity of delivery element 5.Under the preferable situation, the conveying helical pitch of the delivery element 5 of transportation section 24 is than the big 40mm of conveying helical pitch of the delivery element of homogenizing zone, the conveying helical pitch of the delivery element 5 of preferred transportation section 24 is 116-44mm, 116-56mm more preferably, increase the homogenizing time of EVA, store melt simultaneously, improve the extruded velocity that produces line.In specific embodiment of the utility model, the delivery element 5 of transportation section 24 can be 72/72 screwing element (seeing also shown in Fig. 5), 96/96 screwing element (seeing also shown in Fig. 6) and 96/130 screwing element (seeing also shown in Fig. 7), and 72/72 screwing element represents the screwing element that helical pitch and reach are 72mm; 96/96 screwing element represents the screwing element that helical pitch and reach are 96mm; 96/130 screwing element represents that helical pitch is 96, reach is the screwing element of 130mm.In specific embodiment of the utility model, the cone 241 that is 125-75mm by 72/72,72/72,96/96,96/130 screwing element and maximum gauge connects to form the transportation section of screw rod successively.In specific embodiment of the utility model, transportation section 24 is made up of 2 joint screw thread composition elements 20.The length of the preferred transportation section 24 of the utility model is 440-88mm, and more preferably 370-88mm is specially 370mm in the present embodiment.
General screw rod is arranged in extruder screw machine barrel 7, rotation by screw rod during work realizes shearing and the conveying to raw material, the rotation of screw rod can be adopted and well known to a person skilled in the art that variety of way makes its rotation during work, for example to motor and the gear-box of screw arrangement and its adaptation, with the annexation of screw rod with existing identical, repeat no more herein, the power of the motor of selecting for use is because of improvement of the present utility model, can be bigger, to adapt to the big line speed of the big rotating speed of screw rod of the present utility model, extruder, the power of the motor of generally selecting for use is 75-45kw.Extruder screw machine barrel 7 the utility model without limits.
During work, because making in the screw rod every section temperature, heater can reach 25-350 °, generally make the temperature of every section of screw rod reach the technological requirement of producing the EVA film by condensation, thereby realize well extruding of EVA film, preferred feeding section temperature is during work: 58 ~ 68 ° of C; The melt zone temperature is: 85 ~ 95 ° of C; The homogenizing zone temperature is: 90 ~ 85 ° of C; The transportation section temperature is: 85 ~ 90 ° of C; Thereby the EVA film quality that extruder of the present utility model is extruded is higher.Condensation can be adopted and well known to a person skilled in the art the variety of way condensation, for example can connect circulating water device at every section entrance and exit place and control every section temperature.
Charging mechanism 1 is used for raw material is added screw arbor assembly 2, can be for well known to a person skilled in the art various charging mechanisms 1, the weightless scale of the feeding of taper etc. for example, generally be positioned at the initiating terminal top of screw arbor assembly 2, can directly raw material be added in the screw arbor assembly 2 by the deadweight of raw material, can control the rate of feeding that adds the raw material in the screw arbor assembly 2 by the bottom bore of the weightless scale of feeding, in the utility model, because of improvement of the present utility model, the linear velocity during production that the rate of feeding of charging mechanism 1 can significantly improve extruder.The utility model can be selected the charging mechanism 1 that can realize 150 ~ 600Kg/h for use, and can be more excellent be complementary with extruder screw at a high speed can realize the best curtain coating body of big flow during work, the high linear speed when final realization is produced.
According to the raw material difference that adds, for example be coarse raw materials or treated raw material, behind charging mechanism 1, i.e. the porch of raw material, screw arbor assembly 2 also can contain the feeding section, and is positioned at the shearing section after the feeding section.Feeding section and shearing section can adopt and well known to a person skilled in the art various screw rods, can be same as the prior art, do not do at this and to give unnecessary details, the utility model is preferred, and the feeding section can be successively connected by 72/72,72/72,96/96,96/130 screwing element keyway; Shearing section can be successively be connected by 45 °/5/56,45 °/5/56,45 °/5/36 screwing element.
Melt Pump 3 is will be concrete through the EVA fusion curtain coating body pump progressive die of screw rod, after extrude, it can adopt and well known to a person skilled in the art various Melt Pump, power can be 18.5-30kw, with the annexation of screw rod be known in this field, for example can behind the cone 241 of transportation section 24, directly connect Melt Pump 3, also can connect Melt Pump 3 again by pipeline.
Mold 4 flows out from die lip through mold cavity for the curtain coating body that Melt Pump 3 is pumped, and it can adopt and well known to a person skilled in the art various molds 4, generally has the die head of 0.2-2.0mm thickness, can extrude the EVA film in the exit of mold 4.
During work, because making the temperature in the Melt Pump 3, heater can reach 80-90 ° of C, generally make by condensation that temperature reaches the technological requirement that the EVA film is produced in the Melt Pump 3, thereby realize extruding of EVA film, preferred Melt Pump 3 temperature are: 80 ~ 90 ° of C can connect the temperature that circulating water device is controlled Melt Pump 3 in the entrance and exit place in Melt Pump when technological operation.During work, temperature in the mold 4 can reach 85-110 ° of C, make by condensation generally that temperature reaches technological requirement in the mold 4, thereby realize extruding of EVA film, the utility model preferred mold body 4 temperature are: 90 ~ 110 ° of C can connect the temperature that circulating water device is controlled mold in the entrance and exit place at mold 4 when technological operation.
Embodiment 1
The double screw extruder of engagement type in the same way with draw ratio L/D=36:1 is example below, and double screw extruder screw arbor assembly of the present utility model can be as follows:
Begin along the spiro rod length direction from feeding section: feeding section is 56/56,96/96,96/96,96/96,96/96 screwing element; The fusing section is 72/72,72/72,72/72,45 °/5/56,45 °/5/56,72/72,72/72,72/72,45 °/5/36,72/72,72/72,72/72,45 °/5/36 screwing element; Homogenizing zone is 72/72,72/72,56/56,56/56,56/56,56/56,56/56,56/56,56/56,56/56,56/56,56/56,56/56,72/72 screwing element; The transportation section is that 72/72,72/72,96/96,96/130 screwing element and long ratio with maximum gauge are 4:1, and maximum gauge is the cone of 115mm.
Effect: by increasing the transportation section, increase the homogenizing time of EVA and store melt, can offer the enough melts of Melt Pump, can improve the extruded velocity that produces line, the afterbody of transportation section contains the cone that diameter increases simultaneously, can increase the back pressure in the double screw extruder screw arbor assembly machine barrel, makes the melt amount that enters Melt Pump enough, guarantee the constant pressure of melt, can improve the line speed of extruder.Further by changing the screw thread combination, by rational helical pitch and length, make the EVA resin of each humidity province in the screw rod such as feeding section, melt zone, homogenizing zone, transportation section reach best molten condition, make the melt that is plastified to have time enough to obtain best melt in suitable temperature range and enter Melt Pump and extrude the encapsulating film that obtains high-quality by the die head body.Total kneading disc number of the shearing elements of melt zone is greater than 15 simultaneously, shear rate is fast, the delivery element of melt zone carries helical pitch short, during high-speed stirred, mass transport is fast, it is crosslinked can not make that material occurs in cylindrical shell because of strong shearing and stirring, and fraction defective occurs, more can realize film processed at a high speed.The line speed of EVA film can reach 10-30m/min on the double screw extruder of the present utility model.
In this specification, the utility model is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from spirit and scope of the present utility model.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.

Claims (14)

1. a double screw extruder screw arbor assembly comprises screw rod, it is characterized in that, described screw rod is made up of feeding section, melt zone, homogenizing zone and transportation section successively, and the afterbody of described transportation section contains cone.
2. according to the described double screw extruder screw arbor assembly of claim 1, it is characterized in that the length of described cone is 4:1 with the ratio of maximum gauge, maximum gauge is 125-75mm.
3. according to the described double screw extruder screw arbor assembly of claim 1, it is characterized in that, the initial part that described transportation section is connected with homogenizing zone comprises delivery element, described homogenizing zone comprises delivery element, and the conveying helical pitch of the delivery element of described transportation section is than the big 40mm of conveying helical pitch of the delivery element of homogenizing zone.
4. according to the described double screw extruder screw arbor assembly of claim 1, it is characterized in that described screw rod is made up of 9 joint screw thread composition elements, every joint screw thread composition element is that draw ratio is 4:1.
5. double screw extruder screw arbor assembly according to claim 1, it is characterized in that, described feeding section is made up of 2 joint screw thread composition elements, described melt zone is made up of 3 joint screw thread composition elements, described homogenizing zone is made up of 2 joint screw thread composition elements, described transportation section is made up of 2 joint screw thread composition elements, and the draw ratio of every joint screw thread composition element is 4:1.
6. double screw extruder screw arbor assembly according to claim 1 is characterized in that, described melt zone comprises some delivery elements and the some shearing elements that is interspersed, and total kneading disc number of described shearing elements is greater than 15; The conveying helical pitch of the delivery element of described melt zone is 96-44mm.
7. double screw extruder screw arbor assembly according to claim 1 is characterized in that, described homogenizing zone comprises some delivery elements, and the conveying helical pitch of the delivery element of described homogenizing zone is 96-44mm.
8. double screw extruder screw arbor assembly according to claim 1 is characterized in that, described feeding section comprises some delivery elements, and the conveying helical pitch of the delivery element of described feeding section is 96-44mm.
9. double screw extruder screw arbor assembly according to claim 1 is characterized in that, the initial part that described transportation section is connected with homogenizing zone comprises delivery element, and the conveying helical pitch of the delivery element of described transportation section is 116-44mm.
10. double screw extruder screw arbor assembly according to claim 1 is characterized in that, described feeding section is connected by 56/56,96/96,96/96,96/96,96/96 screwing element keyway successively;
Described melt zone is connected by 72/72,72/72,72/72,45 °/5/56,45 °/5/56,72/72,72/72,72/72,45 °/5/36,72/72,72/72,72/72,45 °/5/36 screwing element keyway successively;
Described homogenizing zone is connected by 72/72,72/72,56/56,56/56,56/56,56/56,56/56,56/56,56/56,56/56,56/56,56/56,72/72 screwing element keyway successively;
Described transportation section is connected by the cone that 72/72,72/72,96/96,96/130 screwing element and maximum gauge are 125-75mm successively.
11. double screw extruder screw arbor assembly according to claim 1 is characterized in that, the length of described feeding section is that the length of 440-88mm, melt zone is that the length of 1036-440mm, homogenizing zone is that the length of 1036-440mm, transportation section is 440-88mm.
12. double screw extruder, comprise the charging mechanism that is connected with screw arbor assembly in the material adding screw arbor assembly, screw arbor assembly successively, export the Melt Pump that is connected with screw arbor assembly and be connected the mold that is used for extruded film with Melt Pump for the melt of the screw arbor assembly of will flowing through, it is characterized in that described screw arbor assembly is any described double screw extruder screw arbor assembly of claim 1-11.
13. double screw extruder according to claim 12 is characterized in that, described screw arbor assembly comprises that also being positioned at feeding section shearing section before shears section feeding section before with being positioned at.
14. double screw extruder according to claim 13 is characterized in that, described feeding section is connected by 72/72,72/72,96/96,96/130 screwing element keyway successively;
The described section of shearing is connected by 45 °/5/56,45 °/5/56,45 °/5/36 screwing element successively.
CN2012204304055U 2012-08-28 2012-08-28 Screw assembly of double-screw extruder and double-screw extruder Expired - Lifetime CN203110302U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106313474A (en) * 2016-08-16 2017-01-11 李泽英 Extruding device, equipment and method for preparing thermoplastic polymer product

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106313474A (en) * 2016-08-16 2017-01-11 李泽英 Extruding device, equipment and method for preparing thermoplastic polymer product
CN106313474B (en) * 2016-08-16 2019-04-19 李泽英 It is used to prepare extrusion device, the device and method of thermoplastic polymer articles

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