CN105034309A - Co-rotating twin-screw compound extruder for producing light diffusion plates and production process thereof - Google Patents
Co-rotating twin-screw compound extruder for producing light diffusion plates and production process thereof Download PDFInfo
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- CN105034309A CN105034309A CN201510536752.4A CN201510536752A CN105034309A CN 105034309 A CN105034309 A CN 105034309A CN 201510536752 A CN201510536752 A CN 201510536752A CN 105034309 A CN105034309 A CN 105034309A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means 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
- B29C48/40—Means 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
- B29C48/402—Means 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 the screws having intermeshing parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/565—Screws having projections other than the thread, e.g. pins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/575—Screws provided with elements of a generally circular cross-section for shearing the melt, i.e. shear-ring elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/64—Screws with two or more threads
- B29C48/655—Screws with two or more threads having three or more threads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/76—Venting, drying means; Degassing means
- B29C48/763—Vent constructions, e.g. venting means avoiding melt escape
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/76—Venting, drying means; Degassing means
- B29C48/765—Venting, drying means; Degassing means in the extruder apparatus
- B29C48/766—Venting, drying means; Degassing means in the extruder apparatus in screw extruders
- B29C48/767—Venting, drying means; Degassing means in the extruder apparatus in screw extruders through a degassing opening of a barrel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92885—Screw or gear
Abstract
The invention relates to the technical field of equipment for producing light diffusion plates, in particular to a co-rotating twin-screw compound extruder for producing light diffusion plates and a production process thereof. The co-rotating twin-screw compound extruder mainly consists of a frame, a feeing device, a transmission device and an extruding device, wherein the extruding device mainly consists of a feeding section, a melting section and a homogenizing section; the melting section mainly consists of interrupted screw edges and annularly arranged pins; vacuumizing exhaust devices are respectively arranged at the upper and lower ends of the melting section; and multiple discharge holes are formed on screw edges of twin screws in the extruding device in the axial direction of the screws. After the structure is adopted, the melting section consisting of the interrupted screw edges and the annularly arranged pins can be used for fully plasticizing materials; the holes formed in the axial direction of the screw edges are used for making up the defect of extruding out broken materials in the movement engagement process of the twin screws in the extruding process so as to realize continuous and stable material extruding process; and the upper and lower vacuumizing exhaust devices are used for discharging impurities and waste gas to guarantee the quality of the light diffusion plates.
Description
Technical field
The present invention relates to a kind of equipment technical field of producing light diffusing sheet, particularly a kind of parallel dual-screw complex extruder and production technology thereof of producing light diffusing sheet.
Technical background
Light diffusing sheet is the means by chemistry or physics, during the medium utilizing light to be expert to run in track two refractive indexes different, reflect, reflect and imagine with the physics of scattering, by adding inorganic or organic light diffusing agent or artificially adjust light by the arrayed of the micro-feature structure of substrate surface, make the refraction of light generation different directions, reflection and scattering in the Substrate basis such as PMMA, PS, PS, PP, thus change the course of light, realize the fully loose look of incident light produces optics diffusion effect with this.
Parallel dual-screw complex extruder is one of visual plant producing light diffusing sheet.Traditional production light diffusing sheet be by PS raw material and powdery diffusant blended, carry out granulation by parallel dual-screw, then add in single screw extrusion machine according to certain ratio, by die head and three-roll formation sheet material.Owing to have passed through a granulation in the process of producing, masterbatch physical property after high temperature declines, and has influence on the Forming Quality of diffuser plate; Simultaneously can be regular in the process of granulation run into stain or other unfavorable conditions, the input and output rate caused is not high, has had a strong impact on the quality of diffuser plate, has added production cost.In existing production diffuser plate equipment; also to have and use parallel dual-screw extruding machine to produce diffuser plate; but regular appearance plastifying fusion poor effect; the phenomenon causing material to hold screw rod tightly causing screw rod to rupture; the extruding end at screw rod also had usually there will be the desultory situation of discharging, and serious has had influence on the quality of diffuser plate.So the equipment of existing production diffuser plate also exists very large defect in design and structure, the growth requirement of modern society can not be met.
Summary of the invention
The technical issues that need to address of the present invention are producing the plasticizing and melting weak effect, the intermittent problem of extruder extruding end discharging that the stain, defective products problem and the parallel dual-screw extruding machine that occur in diffuser plate process occur when producing.
For solving the problems of the technologies described above, the invention provides a kind of parallel dual-screw complex extruder producing light diffusing sheet, primarily of frame, feeding device, transmission device and pressurizing unit composition, described transmission device is arranged on one end of frame, the side of transmission device is connected with pressurizing unit, the top of described pressurizing unit is provided with feeding device, the feeding section that described pressurizing unit engages primarily of twin-screw, melt zone and homogenizing zone composition, described melt zone forms primarily of the pin of intermittent type spiral shell rib and annular arrangement, the upper and lower side of described melt zone is provided with vacuumizing and exhausting device, the spiral shell rib of the twin-screw in pressurizing unit is provided with multiple discharge opening along screw axial direction.
Limit further, in technique scheme, described vacuumizing and exhausting device forms primarily of bleeding point, water tank, pump-line, air gauge and aspiration pump, the upper and lower of described melt zone is provided with bleeding point, the upper end of described bleeding point connects water tank by pump-line, described pump-line is provided with air gauge, and the top of described water tank connects aspiration pump by pump-line, and waste gas is discharged by pump-line by the other end of aspiration pump.
Limit further, in technique scheme, between described melt zone and homogenizing zone, be provided with screen pack.
Limit further, in technique scheme, on the twin-screw axial direction of described feeding section He on corresponding barrel, be provided with cooling water pipe.
Limit further, in technique scheme, described feeding device is also provided with charge level control device; Described charge level control device forms primarily of hopper, upper level-sensing device, feed pipe, electromagnetic switch, change-over switch, hand switch and lower level-sensing device, the inner side of described hopper is respectively arranged with level-sensing device and lower level-sensing device up and down, described hopper covers and is provided with feed pipe, being connected with electromagnetic switch of described feed pipe, described electromagnetic switch, change-over switch and upper level-sensing device are sequentially connected in series, and described hand switch, lower level-sensing device are in parallel with upper level-sensing device.
Parallel dual-screw complex extruder produces a method for wide diffuser plate, and its step comprises: PS raw material, diffusant and auxiliary agent stir 3 ~ 5 minutes in batch mixer high speed by a. main frame batch mixing; B. subsidiary engine batch mixing is by main frame formula or add uv-resistant material by raw material and put into batch mixer again and carry out high-speed stirred 3 ~ 5 minutes; C. main frame batch mixing is directly delivered in twin-screw barrel by screw rod feeding device; D. subsidiary engine batch mixing is directly delivered in singe screw barrel by screw rod feeding device; E. compound melt extrudes to die head via parallel equidirectional two-screw, and residual and moisture extraction out, removes impurity, improves the purity of melt, afterwards equally by three roll-ins flower forming extrusion sheet materials by low molecule in melt to take vacuumizing method in the middle of barrel; F. subsidiary engine composite bed takes Single screw extrusion, is covered with uv-resistant and antistatic layer by compound die head in mould at diffuser surface.
Limit further, in technique scheme, described twin-screw and the diameter of singe screw are 60mm.
Limit further, in technique scheme, in described method step c, the temperature in each district of twin-screw is 170 DEG C ~ 200 DEG C, a district; Two 200 DEG C, districts ~ 220 DEG C; Three 200 DEG C, districts ~ 230 DEG C; Four 210 DEG C, districts ~ 230 DEG C; Five 205 DEG C, districts ~ 240 DEG C; Six 210 DEG C, districts ~ 235 DEG C; Seven 210 DEG C, districts ~ 240 DEG C; A described district and 2nd district are feeding section, and 3rd described district, four He Wu districts of district are melt zone, and 6th described district and 7th district are homogenizing zone.
Limit further, in technique scheme, in described method Step d, the temperature in each district of singe screw is 180 DEG C ~ 200 DEG C, a district; Two 190 DEG C, districts ~ 210 DEG C; Three 210 DEG C, districts ~ 230 DEG C; Four 220 DEG C, districts ~ 235 DEG C; Five 220 DEG C, districts ~ 235 DEG C; A described district and 2nd district are feeding section, and 3rd described district and 4th district are melt zone, and 5th described district are homogenizing zone.
After adopting said structure, the present invention can be plastified material fully by the melt zone of the pin composition of intermittent type spiral shell rib and annular arrangement, ensure the effect of plasticizing, utilize the hole on being arranged on spiral shell rib axial direction to ensure can to make up twin-screw in the process extruded and extrude fracture defect in the process of motion engagement, realize continual and steady material extrusion process, can also utilize the device of vacuumizing and exhausting up and down that melt zone is arranged can steam in effective blowoff material whipping process and some solid impurities, thus ensure that light diffusing sheet does not have stain, the bad problem of the quality such as mark of break, improve the yield rate of light diffusing sheet.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is the structural representation of double screw extruder of the present invention.
Fig. 3 is the schematic cross-section of feeding section in double screw extruder of the present invention.
Fig. 4 is the schematic cross-section of homogenizing zone in double screw extruder of the present invention.
Fig. 5 is the structural representation of charge level control device of the present invention.
Fig. 6 is the structural representation of subsidiary engine extrusion device in the present invention.
In figure: 1, frame, 2, feeding device, 3, transmission device, 4, pressurizing unit, 5, intermittent type spiral shell rib, 6, pin, 7, discharge opening, 8, bleeding point, 9, water tank, 10, pump-line, 11, air gauge, 12, aspiration pump, 13, screen pack, 14, cooling water pipe, 15, hopper, 16, upper level-sensing device, 17, feed pipe, 18, electromagnetic switch, 19, change-over switch, 20, hand switch, 21, lower level-sensing device.
Detailed description of the invention
A kind of parallel dual-screw complex extruder producing light diffusing sheet as shown in figures 1-4, form primarily of frame 1, feeding device 2, transmission device 3 and pressurizing unit 4, transmission device 3 is arranged on one end of frame 1, the side of transmission device 3 is connected with pressurizing unit 4, the top of pressurizing unit 4 is provided with feeding device 2, feeding section, melt zone and the homogenizing zone composition that pressurizing unit 4 engages primarily of twin-screw; Melt zone forms primarily of the pin 6 of intermittent type spiral shell rib 5 and annular arrangement, and the upper and lower side of melt zone is provided with vacuumizing and exhausting device, and the spiral shell rib of the twin-screw in pressurizing unit is provided with multiple discharge opening 7 along screw axial direction.
Wherein vacuumizing and exhausting device forms primarily of bleeding point 8, water tank 9, pump-line 10, air gauge 11 and aspiration pump 12, the upper and lower of melt zone is provided with bleeding point 8, the upper end of bleeding point 8 connects water tank 9 by pump-line 10, pump-line 10 is provided with air gauge 11, the top of water tank 9 connects aspiration pump 12 by pump-line 10, and waste gas is discharged by pump-line 10 by the other end of aspiration pump 12.Screen pack 13 is provided with between melt zone and homogenizing zone.Cooling water pipe 14 is provided with on the twin-screw axial direction of feeding section He on corresponding barrel.Feeding device is also provided with charge level control device.Charge level control device forms primarily of hopper 15, upper level-sensing device 16, feed pipe 17, electromagnetic switch 18, change-over switch 19, hand switch 20 and lower level-sensing device 21, the inner side of hopper 15 is respectively arranged with level-sensing device 16 and lower level-sensing device 21 up and down, hopper 15 covers and is provided with feed pipe 17, being connected with electromagnetic switch 18 of feed pipe 17, electromagnetic switch 18, change-over switch 19 are sequentially connected in series with upper level-sensing device 16, and hand switch 20, lower level-sensing device 21 are in parallel with upper level-sensing device 16.
Parallel dual-screw complex extruder produces a method for wide diffuser plate, and its step comprises: PS raw material, diffusant and auxiliary agent stir 3 ~ 5 minutes in batch mixer high speed by a. main frame batch mixing; B. subsidiary engine batch mixing is by main frame formula or add uv-resistant material by raw material and put into batch mixer again and carry out high-speed stirred 3 ~ 5 minutes; C. main frame batch mixing is directly delivered in twin-screw barrel by screw rod feeding device; D. subsidiary engine batch mixing is directly delivered in singe screw barrel by screw rod feeding device; E. compound melt extrudes to die head via parallel equidirectional two-screw, and residual and moisture extraction out, removes impurity, improves the purity of melt, afterwards equally by three roll-ins flower forming extrusion sheet materials by low molecule in melt to take vacuumizing method in the middle of barrel; F. subsidiary engine composite bed takes Single screw extrusion, is covered with uv-resistant and antistatic layer by compound die head in mould at diffuser surface.
Wherein the diameter of twin-screw and singe screw is 60mm.In step c, the temperature in each district of twin-screw is 170 DEG C ~ 200 DEG C, a district; Two 200 DEG C, districts ~ 220 DEG C; Three 200 DEG C, districts ~ 230 DEG C; Four 210 DEG C, districts ~ 230 DEG C; Five 205 DEG C, districts ~ 240 DEG C; Six 210 DEG C, districts ~ 235 DEG C; Seven 210 DEG C, districts ~ 240 DEG C; One district and 2nd district are feeding section, and 3rd district, four He Wu districts of district are melt zone, and 6th district and 7th district are homogenizing zone.In method Step d, the temperature in each district of singe screw is 180 DEG C ~ 200 DEG C, a district; Two 190 DEG C, districts ~ 210 DEG C; Three 210 DEG C, districts ~ 230 DEG C; Four 220 DEG C, districts ~ 235 DEG C; Five 220 DEG C, districts ~ 235 DEG C; One district and 2nd district are feeding section, and 3rd district and 4th district are melt zone, and 5th district are homogenizing zone.
As shown in Figure 1, vacuumizing and exhausting device forms primarily of bleeding point 8, water tank 9, pump-line 10, air gauge 11 and aspiration pump 12, the upper and lower of melt zone is provided with bleeding point 8, the upper end of bleeding point 8 connects water tank 9 by pump-line 10, pump-line 10 is provided with air gauge 11, the top of water tank 9 connects aspiration pump 12 by pump-line 10, and waste gas is discharged by pump-line 10 by the other end of aspiration pump 12.When material is in double screw extruder, transmit in the process extruded and can produce a large amount of waste gas and solid impurity, have a strong impact on the quality of light diffusing sheet, light diffusing sheet can be made to occur the phenomenon such as stain, speckle, pass through vacuum extractor, can it be evacuated in water tank 9 by bleeding point 8, filter, impurity waste gas after filtration is discharged by the pump-line 10 connecting aspiration pump 12 again, pump-line 10 also being arranged air gauge 11 can its pressure of monitoring at any time, ensures the normal operation of vacuum extractor.
Screen pack 13 is provided with between melt zone and homogenizing zone.Such design can make the material of melt zone further filter, and ensures the dry materials, the free from admixture that enter homogenizing zone, and what further ensure light diffusing sheet extrudes quality.
As shown in Figure 2, melt zone forms primarily of the pin 6 of intermittent type spiral shell rib 5 and annular arrangement, such design can utilize the pin 6 of ring-type to increase shearing force, improves the effect of plasticizing, then adopts intermittent type spiral shell rib 5 and its combination can make the better effects if of material plasticizing.
As shown in Figure 3, cooling water pipeline is set in the barrel and screw rod of feeding section, is hold screw rod tightly to make to there will not be material melts in reinforced process, makes the obstructed blockage problem caused of blanking.
As shown in Figure 3 and Figure 4, the spiral shell rib of the twin-screw in pressurizing unit is provided with multiple discharge opening 7 along screw axial direction.When material is extruded at extruding end time, in the process that twin-screw rotates, when engagement, traditional twin-screw does not have material and extrudes, and so just there will be one and extrudes fluctuation problem, cause the desultory problem of material extruded, the present invention is provided with discharge opening 7 and can makes when twin-screw runs on the spiral shell rib of screw rod, and part material throws away from discharge opening 7, can be used for making up the fluctuation of extruding, ensure material continue extrude, improve the quality of light diffusing sheet.
As shown in Figure 5, feeding device is also provided with charge level control device.Charge level control device forms primarily of hopper 15, upper level-sensing device 16, feed pipe 17, electromagnetic switch 18, change-over switch 19, hand switch 20 and lower level-sensing device 21, the inner side of hopper 15 is respectively arranged with level-sensing device 16 and lower level-sensing device 21 up and down, hopper 15 covers and is provided with feed pipe 17, being connected with electromagnetic switch 18 of feed pipe 17, electromagnetic switch 18, change-over switch 19 are sequentially connected in series with upper level-sensing device 16, and hand switch 20, lower level-sensing device 21 are in parallel with upper level-sensing device 16.When the material in hopper 15 reaches lower level-sensing device 21 time, electromagnetic switch 18 can be opened connect outside pay-off carry out feeding, when feeding reaches upper level-sensing device 16 time, electromagnetic switch can be closed, open change-over switch 19, automatic closedown charging, added material quantitatively can be added like this, ensure to there will not be the phenomenon of feed blocking charging aperture to occur.
Test as follows under equal pulp furnish and technical conditions.
Embodiment one:
A. PS raw material, diffusant and auxiliary agent are stirred 3 minutes in batch mixer high speed by main frame batch mixing; B. subsidiary engine batch mixing is by main frame formula or add uv-resistant material by raw material and put into batch mixer again and carry out high-speed stirred 3 minutes; C. main frame batch mixing is directly delivered in twin-screw barrel by screw rod feeding device; The temperature in each district of twin-screw is set to 175 DEG C, a district; Two 203 DEG C, districts; Three 210 DEG C, districts; Four 208 DEG C, districts; Five 220 DEG C, districts; Six 220 DEG C, districts; Seven 215 DEG C, districts; D. subsidiary engine batch mixing is directly delivered in singe screw barrel by screw rod feeding device; The temperature in each district of singe screw is 185 DEG C, a district; Two 195 DEG C, districts; Three 215 DEG C, districts; Four 220 DEG C, districts; Five 220 DEG C, districts; E. compound melt extrudes to die head via parallel equidirectional two-screw, and residual and moisture extraction out, removes impurity, improves the purity of melt, afterwards equally by three roll-ins flower forming extrusion sheet materials by low molecule in melt to take vacuumizing method in the middle of barrel; F. subsidiary engine composite bed takes Single screw extrusion, is covered with uv-resistant and antistatic layer by compound die head in mould at diffuser surface.
Embodiment two:
A. PS raw material, diffusant and auxiliary agent are stirred 4 minutes in batch mixer high speed by main frame batch mixing; B. subsidiary engine batch mixing is by main frame formula or add uv-resistant material by raw material and put into batch mixer again and carry out high-speed stirred 4 minutes; C. main frame batch mixing is directly delivered in twin-screw barrel by screw rod feeding device; The temperature in each district of twin-screw is set to 180 DEG C, a district; Two 205 DEG C, districts; Three 215 DEG C, districts; Four 220 DEG C, districts; Five 225 DEG C, districts; Six 225 DEG C, districts; Seven 220 DEG C, districts; D. subsidiary engine batch mixing is directly delivered in singe screw barrel by screw rod feeding device; The temperature in each district of singe screw is 190 DEG C, a district; Two 200 DEG C, districts; Three 220 DEG C, districts; Four 225 DEG C, districts; Five 225 DEG C, districts; E. compound melt extrudes to die head via parallel equidirectional two-screw, and residual and moisture extraction out, removes impurity, improves the purity of melt, afterwards equally by three roll-ins flower forming extrusion sheet materials by low molecule in melt to take vacuumizing method in the middle of barrel; F. subsidiary engine composite bed takes Single screw extrusion, is covered with uv-resistant and antistatic layer by compound die head in mould at diffuser surface.
Implement three:
A. PS raw material, diffusant and auxiliary agent are stirred 5 minutes in batch mixer high speed by main frame batch mixing; B. subsidiary engine batch mixing is by main frame formula or add uv-resistant material by raw material and put into batch mixer again and carry out high-speed stirred 5 minutes; C. main frame batch mixing is directly delivered in twin-screw barrel by screw rod feeding device; The temperature in each district of twin-screw is set to 195 DEG C, a district; Two 215 DEG C, districts; Three 220 DEG C, districts; Four 225 DEG C, districts; Five 230 DEG C, districts; Six 230 DEG C, districts; Seven 230 DEG C, districts; D. subsidiary engine batch mixing is directly delivered in singe screw barrel by screw rod feeding device; The temperature in each district of singe screw is 195 DEG C, a district; Two 205 DEG C, districts; Three 225 DEG C, districts; Four 230 DEG C, districts; Five 230 DEG C, districts; E. compound melt extrudes to die head via parallel equidirectional two-screw, and residual and moisture extraction out, removes impurity, improves the purity of melt, afterwards equally by three roll-ins flower forming extrusion sheet materials by low molecule in melt to take vacuumizing method in the middle of barrel; F. subsidiary engine composite bed takes Single screw extrusion, is covered with uv-resistant and antistatic layer by compound die head in mould at diffuser surface.
Following table is the testing result of the light diffusing sheet of embodiment 1 ~ 3
| Embodiment 1 | Embodiment 2 | Embodiment 3 | |
| With or without stain impurity | Nothing | Nothing | Have |
| Light transmittance (%) | 45.5 | 63.5 | 52.5 |
| Mist-penetrating degree (%) | 83.5 | 98.2 | 92.3 |
Embodiment 2 is most preferred embodiment as can be seen from the above table, the light diffusing sheet produced the best in quality.
As shown in Figure 1, vacuumizing and exhausting device forms primarily of bleeding point 8, water tank 9, pump-line 10, air gauge 11 and aspiration pump 12, the upper and lower of melt zone is provided with bleeding point 8, the upper end of bleeding point 8 connects water tank 9 by pump-line 10, pump-line 10 is provided with air gauge 11, the top of water tank 9 connects aspiration pump 12 by pump-line 10, and waste gas is discharged by pump-line 10 by the other end of aspiration pump 12.When material is in double screw extruder, transmit in the process extruded and can produce a large amount of waste gas and solid impurity, have a strong impact on the quality of light diffusing sheet, light diffusing sheet can be made to occur the phenomenon such as stain, speckle, pass through vacuum extractor, can it be evacuated in water tank 9 by bleeding point 8, filter, impurity waste gas after filtration is discharged by the pump-line 10 connecting aspiration pump 12 again, pump-line 10 also being arranged air gauge 11 can its pressure of monitoring at any time, ensures the normal operation of vacuum extractor.
Screen pack 13 is provided with between melt zone and homogenizing zone.Such design can make the material of melt zone further filter, and ensures the dry materials, the free from admixture that enter homogenizing zone, and what further ensure light diffusing sheet extrudes quality.
As shown in Figure 2, melt zone forms primarily of the pin 6 of intermittent type spiral shell rib 5 and annular arrangement, such design can utilize the pin 6 of ring-type to increase shearing force, improves the effect of plasticizing, then adopts intermittent type spiral shell rib 5 and its combination can make the better effects if of material plasticizing.
As shown in Figure 3, cooling water pipeline is set in the barrel and screw rod of feeding section, is hold screw rod tightly to make to there will not be material melts in reinforced process, makes the obstructed blockage problem caused of blanking.
As shown in Figure 3 and Figure 4, the spiral shell rib of the twin-screw in pressurizing unit is provided with multiple discharge opening 7 along screw axial direction.When material is extruded at extruding end time, in the process that twin-screw rotates, when engagement, traditional twin-screw does not have material and extrudes, and so just there will be one and extrudes fluctuation problem, cause the desultory problem of material extruded, the present invention is provided with discharge opening 7 and can makes when twin-screw runs on the spiral shell rib of screw rod, and part material throws away from discharge opening 7, can be used for making up the fluctuation of extruding, ensure material continue extrude, improve the quality of light diffusing sheet.
As shown in Figure 5, feeding device is also provided with charge level control device.Charge level control device forms primarily of hopper 15, upper level-sensing device 16, feed pipe 17, electromagnetic switch 18, change-over switch 19, hand switch 20 and lower level-sensing device 21, the inner side of hopper 15 is respectively arranged with level-sensing device 16 and lower level-sensing device 21 up and down, hopper 15 covers and is provided with feed pipe 17, being connected with electromagnetic switch 18 of feed pipe 17, electromagnetic switch 18, change-over switch 19 are sequentially connected in series with upper level-sensing device 16, and hand switch 20, lower level-sensing device 21 are in parallel with upper level-sensing device 16.When the material in hopper 15 reaches lower level-sensing device 21 time, electromagnetic switch 18 can be opened connect outside pay-off carry out feeding, when feeding reaches upper level-sensing device 16 time, electromagnetic switch can be closed, open change-over switch 19, automatic closedown charging, added material quantitatively can be added like this, ensure to there will not be the phenomenon of feed blocking charging aperture to occur.
Although the foregoing describe the specific embodiment of the present invention; but those skilled in the art are to be understood that; these only illustrate; various changes or modifications can be made to present embodiment; and not deviating from principle of the present invention and essence, protection scope of the present invention is only defined by the appended claims.
Claims (9)
1. produce the parallel dual-screw complex extruder of light diffusing sheet for one kind, primarily of frame, feeding device, transmission device and pressurizing unit composition, described transmission device is arranged on one end of frame, the side of transmission device is connected with pressurizing unit, the top of described pressurizing unit is provided with feeding device, the feeding section that described pressurizing unit engages primarily of twin-screw, melt zone and homogenizing zone composition, it is characterized in that: described melt zone forms primarily of the pin of intermittent type spiral shell rib and annular arrangement, the upper and lower side of described melt zone is provided with vacuumizing and exhausting device, the spiral shell rib of the twin-screw in pressurizing unit is provided with multiple discharge opening along screw axial direction.
2. a kind of parallel dual-screw complex extruder producing light diffusing sheet according to claim 1, it is characterized in that: described vacuumizing and exhausting device forms primarily of bleeding point, water tank, pump-line, air gauge and aspiration pump, the upper and lower of described melt zone is provided with bleeding point, the upper end of described bleeding point connects water tank by pump-line, described pump-line is provided with air gauge, the top of described water tank connects aspiration pump by pump-line, and waste gas is discharged by pump-line by the other end of aspiration pump.
3. a kind of parallel dual-screw complex extruder producing light diffusing sheet according to claim 1, is characterized in that: be provided with screen pack between described melt zone and homogenizing zone.
4. a kind of parallel dual-screw complex extruder producing light diffusing sheet according to claim 1, is characterized in that: be provided with cooling water pipe on the twin-screw axial direction of described feeding section He on corresponding barrel.
5. a kind of parallel dual-screw complex extruder producing light diffusing sheet according to claim 1, is characterized in that: described feeding device is also provided with charge level control device; Described charge level control device forms primarily of hopper, upper level-sensing device, feed pipe, electromagnetic switch, change-over switch, hand switch and lower level-sensing device, the inner side of described hopper is respectively arranged with level-sensing device and lower level-sensing device up and down, described hopper covers and is provided with feed pipe, being connected with electromagnetic switch of described feed pipe, described electromagnetic switch, change-over switch and upper level-sensing device are sequentially connected in series, and described hand switch, lower level-sensing device are in parallel with upper level-sensing device.
6. produce a method for wide diffuser plate with parallel dual-screw complex extruder according to claim 1, its step comprises:
A. PS raw material, diffusant and auxiliary agent stir 3 ~ 5 minutes in batch mixer high speed by main frame batch mixing;
B. subsidiary engine batch mixing is by main frame formula or add uv-resistant material by raw material and put into batch mixer again and carry out high-speed stirred 3 ~ 5 minutes;
C. main frame batch mixing is directly delivered in twin-screw barrel by screw rod feeding device;
D. subsidiary engine batch mixing is directly delivered in singe screw barrel by screw rod feeding device;
E. compound melt extrudes to die head via parallel equidirectional two-screw, and residual and moisture extraction out, removes impurity, improves the purity of melt, afterwards equally by three roll-ins flower forming extrusion sheet materials by low molecule in melt to take vacuumizing method in the middle of barrel;
F. subsidiary engine composite bed takes Single screw extrusion, is covered with uv-resistant and antistatic layer by compound die head in mould at diffuser surface.
7. a kind of method of producing wide diffuser plate with parallel dual-screw complex extruder according to claim 1 according to claim 6, is characterized in that: described twin-screw and the diameter of singe screw are 60mm.
8. a kind of method of producing wide diffuser plate with parallel dual-screw complex extruder according to claim 1 according to claim 6, is characterized in that, in described method step c, the temperature in each district of twin-screw is 170 DEG C ~ 200 DEG C, a district; Two 200 DEG C, districts ~ 220 DEG C; Three 200 DEG C, districts ~ 230 DEG C; Four 210 DEG C, districts ~ 230 DEG C; Five 205 DEG C, districts ~ 240 DEG C; Six 210 DEG C, districts ~ 235 DEG C; Seven 210 DEG C, districts ~ 240 DEG C; A described district and 2nd district are feeding section, and 3rd described district, four He Wu districts of district are melt zone, and 6th described district and 7th district are homogenizing zone.
9. a kind of method of producing light diffusing sheet with parallel dual-screw complex extruder according to claim 1 according to claim 6, is characterized in that: in described method Step d, the temperature in each district of singe screw is 180 DEG C ~ 200 DEG C, a district; Two 190 DEG C, districts ~ 210 DEG C; Three 210 DEG C, districts ~ 230 DEG C; Four 220 DEG C, districts ~ 235 DEG C; Five 220 DEG C, districts ~ 235 DEG C; A described district and 2nd district are feeding section, and 3rd described district and 4th district are melt zone, and 5th described district are homogenizing zone.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108859058A (en) * | 2018-06-25 | 2018-11-23 | 贵州荣兴新型建材科技有限公司 | The processing unit (plant) of PE wood plastic particles |
| CN110879431A (en) * | 2019-12-07 | 2020-03-13 | 广东欧迪明光电科技股份有限公司 | Brightening composite diffuser plate and manufacturing process thereof |
| WO2021056534A1 (en) * | 2019-09-27 | 2021-04-01 | 苏州比达尔创新材料科技有限公司 | Ultrafine fiber extrusion device |
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| CN1715962A (en) * | 2004-06-28 | 2006-01-04 | 颖台科技股份有限公司 | Light spreading plate with high surface hardness and its producing method |
| EP1829660A2 (en) * | 2006-03-03 | 2007-09-05 | Reimelt Henschel MischSysteme GmbH | Mixer and kneader for plastics |
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| JP2002254492A (en) * | 2001-03-06 | 2002-09-11 | Toshiba Mach Co Ltd | Pva extrusion method using twin-screw extruder and twin-screw extruder |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108044904A (en) * | 2017-10-25 | 2018-05-18 | 苏州三鑫时代新材料股份有限公司 | A kind of preparation method of three-in-one light diffusing sheet |
| CN108859058A (en) * | 2018-06-25 | 2018-11-23 | 贵州荣兴新型建材科技有限公司 | The processing unit (plant) of PE wood plastic particles |
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| WO2021056534A1 (en) * | 2019-09-27 | 2021-04-01 | 苏州比达尔创新材料科技有限公司 | Ultrafine fiber extrusion device |
| CN110879431A (en) * | 2019-12-07 | 2020-03-13 | 广东欧迪明光电科技股份有限公司 | Brightening composite diffuser plate and manufacturing process thereof |
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| CN105034309B (en) | 2017-06-16 |
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Effective date of registration: 20200714 Address after: 071000 Beizhuang village, Xiong County, Baoding City, Hebei Province Patentee after: Xiongxian Yutai rubber and plastic products Co.,Ltd. Address before: 212300 Jiangsu province Changzhou new North Lu Tang Road, No. 58 Patentee before: CHANGZHOU LIANFENG OPTOELECTRONICS TECHNOLOGY Co.,Ltd. |