CN102744819A - Tape casting machine, and method for producing ventilating waterproofing membrane using same - Google Patents
Tape casting machine, and method for producing ventilating waterproofing membrane using same Download PDFInfo
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- CN102744819A CN102744819A CN2012102041613A CN201210204161A CN102744819A CN 102744819 A CN102744819 A CN 102744819A CN 2012102041613 A CN2012102041613 A CN 2012102041613A CN 201210204161 A CN201210204161 A CN 201210204161A CN 102744819 A CN102744819 A CN 102744819A
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Abstract
The invention discloses a tape casting machine, and a method for producing ventilating waterproofing membrane using the same. The tape casting machine comprises a feeding device, a screw-screw cylinder extrusion device, a heating device, a driving device for the screw, a die head, a melt pressure control device, a melt density control device, and a membrane-lip gap control device, wherein the melt pressure control device controls the heating device and the driving device according to the detected melt pressure signals to maintain the melt pressure stable; the melt density control device controls the feeding device according to the detected melt density signals to maintain the melt density stable; and the membrane-lip gap control device controls a membrane-lip gap regulating device according to the detected membrane-lip gap signals to maintain the membrane-lip gap stable. Combining the stable melt pressure, melt density and membrane-lip gap, thin membrane with even thickness extruded by the tape casting machine is ensured.
Description
Technical field
The present invention relates to technical field of plastic, particularly a kind of casting machine and the method that is used to produce waterproof ventilated membrane thereof.
Background technology
Waterproof ventilated membrane mainly is to be carrier with the thermoplastic, adds inorganic mineral filler after the extrusion molding of the cold roller method of forming of curtain coating is handled through longitudinal stretching then, makes it to have unique microcellular structure.These are distributed in the special construction micropore of film surface with high density, make the seepage that film can liquid barrier water, can let gas molecules such as water vapour pass through again.At present the main application fields of waterproof ventilated membrane comprises that personal hygiene nursing materials, medical protection articles for use (like medical bed mattress, protective garment, operation dress, Operating sheet, hot compress paste, Medical pillowcase etc.), special place personal protective equipment, clothes back boxing, medicine packing use auxiliary material, building trade etc.Hong Kong and Taiwan area in America and Europe, Japan, Korea S, the Far East Area and China, the waterproof ventilated membrane that has been widely used is in above-mentioned field.Existing waterproof and breathable membrane production equipment mainly is by casting machine, pre-heating system, tensioning system, formations such as cooling and shaping system.There are the technical barrier of the film became uneven that casting machine produces in present waterproof and breathable film production method and production equipment; Caused the air penetrability deviation of the waterproof ventilated membrane product vertical and horizontal of producing bigger, be difficult to be applied to require the less field of air penetrability deviation to use.
Summary of the invention
The objective of the invention is to overcome the shortcoming and the deficiency of prior art, a kind of casting machine that can produce the uniform film of thickness is provided.
Another object of the present invention is to provide a kind of above-mentioned casting machine to be used to produce the method for waterproof ventilated membrane.
The object of the invention is realized through following technical proposals:
A kind of casting machine comprises feeding device, screw rod barrel extrusion device, heater and die head, and wherein, the screw rod in the screw rod barrel extrusion device is connected with drive unit; This casting machine also comprises melt pressure control device, fusant density control device and film interlabial gap control device, wherein:
Described melt pressure control device comprises melt pressure measurement mechanism and pressure feedback control system; Wherein, The melt pressure measurement mechanism is arranged between screw rod barrel extrusion device and the die head, and pressure feedback control system is connected with melt pressure measurement mechanism, heater and drive unit respectively;
Described fusant density control device comprises fusant density tester and density feedback control system; Wherein, The fusant density tester is arranged between screw rod barrel extrusion device and the die head, and the density feedback control system is connected with fusant density tester and feeding device respectively;
Described film interlabial gap control device comprises film interlabial gap measurement mechanism, film interlabial gap adjusting device and gap feedback control system; Wherein, Film interlabial gap measurement mechanism and film interlabial gap adjusting device are arranged on the die head, and the gap feedback control system is connected with film interlabial gap adjusting device with film interlabial gap measurement mechanism respectively.
Casting machine of the present invention, wherein, it is same microprocessor that described pressure feedback is controlled system, density feedback control system and gap feedback control system; In addition, above-mentioned three feedback control systems also can be the separate devices that is untreated, and help improving conversion speed, but can make complex system.
Casting machine of the present invention wherein, is connected with vacuum extractor on the described feeding device.The purpose that this vacuum extractor is set is, the air in the material is taken away, eliminates the influence of air to melt pressure and fusant density.
Casting machine of the present invention wherein, is provided with pressure control container between described screw rod barrel extrusion device and the die head, this pressure control container has a shell, is provided with 20～50 filter plates in it, has a plurality of holes not of uniform size on each filter plate.The purpose that this pressure control container is set is to eliminate to a certain extent the fluctuation of material melt pressure, and its operation principle is: melt flows and tends to be steady after flowing through the polylith filter plate, thereby guarantees that melt pressure is stable.
Casting machine of the present invention, wherein, described film interlabial gap adjusting device is made up of two groups of electromagnet that are located on the die head, and these two blocks of electromagnet relatively are provided with on the steel plate of film lip one side, have the gap between the two electromagnet opposing end surfaces.Its operation principle is: when film interlabial gap measurement mechanism detects the film interlabial gap when bigger than normal; The gap feedback control system makes two blocks of electromagnet produce repulsive force; Make the distortion of film lip to reach the purpose that reduces the film interlabial gap; When film interlabial gap measurement mechanism detects the film interlabial gap when less than normal, the gap feedback control system makes two blocks of electromagnet produce attractions, makes the distortion of film lip to reach the purpose that increases the film interlabial gap.
Casting machine of the present invention, wherein, described feeding device comprises metering feed device and storage bin hopper; Wherein, Metering feed device is made up of 2～5 weighing balances, and storage bin hopper is sealedly connected on the bottom of weighing balance, and described vacuum extractor is connected on this storage bin hopper.
Casting machine of the present invention, wherein, described vacuum extractor also is connected with screw rod barrel extrusion device, and its purpose is, the air of screw rod barrel extrusion device is further got rid of, with a progressive influence of eliminating air to melt pressure and fusant density.
A kind of above-mentioned casting machine is used to produce the method for waterproof ventilated membrane, may further comprise the steps:
(1) adds material through feeding device to casting machine;
(2) material acts as molten condition and extrudes from die head through screw rod barrel extrusion device, in this process,
Pressure feedback control system in the melt pressure control device is according to melt pressure measurement mechanism detected melt pressure signal controlling heater and drive unit, thereby the rotating speed and the casting machine of control screw rod are respectively distinguished temperature, makes melt pressure keep stable;
Density feedback control system in the fusant density control device makes fusant density keep stable according to the reinforced ratio in the fusant density signal controlling feeding device of fusant density tester detection;
Gap feedback control system in the film interlabial gap control device makes the film interlabial gap keep stable according to the detected film interlabial gap of film interlabial gap measurement mechanism signal controlling film interlabial gap adjusting device adjustment film interlabial gap;
(3) film of being extruded by casting machine stretches through the film stretching system and shaping film cooling system typing back forms waterproof ventilated membrane.
The method of production waterproof ventilated membrane of the present invention, wherein, the every interval 10-20s of described fusant density tester measures a fusant density, adopts this parameter both to guarantee to monitor the material fusant density in real time, can simplify the method that fusant density detects again.
The method of production waterproof ventilated membrane of the present invention, wherein, the every interval 2-3s of described film interlabial gap measurement mechanism measures a film interlabial gap, through real-time detection film interlabial gap to reach better controlling diaphragm interlabial gap.
Operation principle of the present invention is: the melt pressure control device is adjusted the rotating speed that casting machine is respectively distinguished temperature and screw rod in real time according to detected melt pressure signal controlling heater and drive unit, guarantees that melt pressure remains on a stationary value; The fusant density control device is according to detected fusant density signal controlling feeding device, and the reinforced ratio of adjustment in real time guarantees that fusant density remains on a stationary value; Film interlabial gap control device is adjusted the film interlabial gap in real time according to detected film interlabial gap signal controlling film interlabial gap adjusting device, guarantees that the film interlabial gap remains on a stationary value.It is consistent that above-mentioned melt pressure control device and the acting in conjunction of volume density control device can guarantee whenever to get into the melt pressure and the fusant density of material of casting machine die head; Above-mentioned film interlabial gap control device can guarantee that the film interlabial gap remains unchanged; Thereby making influences the parameter of film gauge uniformity: melt pressure, fusant density and film interlabial gap all keep stable, thereby have guaranteed that the film of extruding has homogeneous thickness.
Describe and to know from top operation principle; Casting machine of the present invention can be produced the uniform film of thickness; For next step film stretching and shaping film process for cooling provides thickness evenness high ventilation film blank, thereby improved the horizontal and vertical thickness evenness of ventilated membrane finished product greatly, made that the horizontal and vertical air penetrability of this ventilated membrane finished product is even; Improved the serviceability of ventilated membrane, be applicable to require the less field of air penetrability deviation to use.
Description of drawings
Fig. 1 is the structural representation of a specific embodiment of casting machine of the present invention.
Fig. 2 is the structural representation (a display part filter plate among the figure) of pressure control container among Fig. 1.
Fig. 3 is the structural representation of filter plate among Fig. 2.
Fig. 4 and Fig. 5 are the structural representation of die head among Fig. 1, and wherein, Fig. 4 is a front view, and Fig. 5 is a left view.
Fig. 6 is pressure of the present invention, density, film interlabial gap control system electricity theory diagram.
The specific embodiment
Referring to Fig. 1; Casting machine of the present invention is arranged on the support; Mainly be made up of feeding device, screw rod barrel extrusion device 2, drive unit, heater, die head 3 and melt pressure control device, fusant density control device and film interlabial gap control device, wherein, drive unit and feeding device are located at of screw rod barrel extrusion device 2; Die head 3 is located at the other end of screw rod barrel extrusion device 2, and heater is located on the screw rod barrel extrusion device 2.Described feeding device comprises metering feed device and storage bin hopper 5; Metering feed device is made up of 2 weighing balances 4; Storage bin hopper 5 is sealedly connected on the bottom of weighing balance 4; Be connected with vacuum extractor 8 on the storage bin hopper 5, this vacuum extractor 8 is the single-stage water-ring vacuum pump, and this vacuum extractor 8 also is connected with the end of screw rod barrel extrusion device 2.Described screw rod barrel extrusion device 2 comprises screw rod and barrel, and wherein screw rod is driven by drive unit, and this drive unit is made up of direct current generator 6 and deceleration device 7.Described heater is made up of the electrical heating piece and the temperature control system that are coated on the barrel surface.
Referring to Fig. 2 and Fig. 3; Be provided with melt pressure control container 9 between described screw rod barrel extrusion device 2 and the die head 3; Two of this melt pressure control container 9 is connected with die head 3 runners with barrel respectively; This pressure control container 9 has a rectangular container, is provided with 30 filter plates 13 in this shell, has a plurality of hole 13-1 not of uniform size on each filter plate 19.
Referring to Fig. 4 and Fig. 5, described die head 3 is casting heads of rack-style structure, and die head 3 is made up of two piece of stainless steel 3-1, and the faying face of two piece of stainless steel 3-1 forms film forming 15, two piece of stainless steel 3-1 in gap through bolt 16 lockings.Piece of stainless steel 3-1 is provided with the inclined plane at corresponding with the film lip one, makes that the cross section of whole die head 3 is tapered of film lip.
Referring to Fig. 1 and Fig. 6; Described melt pressure control device melt pressure measurement mechanism 10 and pressure feedback control system form; Melt pressure measurement mechanism 10 is made up of pressure sensor and pressure display element, and wherein pressure sensor directly directly contacts with the interior material of barrel and die head 3 junction runners.Described feedback control system is made up of microprocessor and control circuit; Melt pressure measurement mechanism 10 feeds back to microprocessor through control circuit after detecting the pressure of material melt, and microprocessor sends instructions to heater and drive unit through after the computing.
See Fig. 1 and Fig. 6; Described fusant density control device is made up of fusant density tester 11 and density feedback control system, and wherein, fusant density tester 11 is formed by deciding volume melt pool, melt cutting element, melt loading component and computing unit; Melt pool is connected between pressure control container 9 and the die head 3; The cutting element melt that the incised melt pool is come out at the certain hour interval is weighed after the cutting, calculates fusant density by computing unit then; Described density feedback control system is made up of microprocessor and control circuit, and fusant density measuring instrument 11 feeds back to microprocessor through control circuit after detecting the density of material melt, and microprocessor sends instructions to feeding device through after the computing.
Referring to Fig. 1, Fig. 4～Fig. 6; Described film interlabial gap control device is made up of film interlabial gap measurement mechanism 12, film interlabial gap adjusting device and gap feedback control system; Wherein, Film interlabial gap measurement mechanism 12 is arranged on the film lip place of die head 3, and this film interlabial gap measurement mechanism 12 is the infrared distance measuring device; Film interlabial gap adjusting device is made up of the electromagnet 14 on the inclined-plane of two wherein a slice piece of stainless steel 3-1 that are located at die head 3; These two blocks of electromagnet 14 are oppositely arranged; Both have certain interval between the opposing end surface, during energising, receive the suction or the thrust of another electromagnet 14 near the electromagnet 14 of film lip; Make piece of stainless steel 3-1 produce distortion at film lip place, thereby the film interlabial gap is widened or dwindle; Described feedback control system is made up of microprocessor and control circuit, feeds back to microprocessor through control circuit after film interlabial gap measurement mechanism 12 detects the film interlabial gap, and microprocessor sends instructions to film interlabial gap adjusting device through after the computing; When film interlabial gap measurement mechanism 12 detects the film interlabial gap when bigger than normal; The gap feedback control system makes two blocks of electromagnet 14 produce repulsive force; Make the distortion of film lip to reach the purpose that reduces the film interlabial gap; When film interlabial gap measurement mechanism 12 detects the film interlabial gap when less than normal, the gap feedback control system makes two blocks of electromagnet 14 produce attractions, makes the distortion of film lip to reach the purpose that increases the film interlabial gap.
Referring to Fig. 6; It is same microprocessor that described pressure feedback is controlled system, density feedback control system and gap feedback control system, and this microprocessor receives the melt pressure checkout gear, the fusant density detector; The signal of gap detection device feedback; Give heater, drive unit, feeding device and film interlabial gap adjusting device through sending instruction after the computing.
In above-mentioned casting machine, beyond top embodiment, can also be other embodiment, for example, the quantity of weighing balance can confirm that the quantity of filter plate also can require in 20～50 scope, to select according to concrete pressure according to the kind of material.
Above-mentioned casting machine of the present invention is used to produce the method for waterproof ventilated membrane, may further comprise the steps:
(1) being added in temperature in two weighing balances 4 in feeding device respectively is that 190 ℃, load are under the 2.16kg condition; Melt flow index is that 3g/10min and melt flow index are the special-purpose PE inserts of ventilated membrane of 5g/10min; Two weighing balances 4 mix two kinds of mass transport in 1: 1 ratio in storage bin hopper 5; Open vacuum extractor 8 simultaneously storage bin hopper 5 inside are evacuated, material gets into screw rod barrel extrusion device 2 from storage bin hopper 5;
(2) material forms molten condition under the heat effect of the screw rod rotation extrusion of screw rod barrel extrusion device 2 and heater, and pressure control container 9 backs of flowing through get into die heads 3 inner flow passages, extrudes from the film lip of die head 3 at last; In said process:
Melt pressure measurement mechanism 10 in the melt pressure control device detects melt pressure in real time; And this melt pressure signal is sent in the pressure feedback control system; Pressure feedback control system is according to the temperature of the variation adjustment heater of this melt pressure signal and the rotating speed of drive motors, and the temperature and the screw speed that influence melt pressure through adjustment guarantee that melt pressure is stabilized in 10MPa;
It is every at a distance from fusant density of 15s detection that fusant density in the fusant density control device is measured dress; And this fusant density signal is sent in the density feedback control system; The density feedback control system is according to the material ratio in 2 weighing balances 4 of variation control feeding device adjustment of this fusant density signal, and the material ratio that influences fusant density through adjustment guarantees that fusant density is stabilized in 1.15g/cm3;
Detect the one-off pattern interlabial gaps according to the every 2.5s of film interlabial gap measurement mechanism 12 in the film interlabial gap control device; And with this die lip gap signal be sent to control reponse system in; The control reponse system is adjusted the die lip gap according to the variation controlling diaphragm interlabial gap adjusting device of this die lip gap signal, makes the die lip gap be stabilized in 0.16mm;
The melt pressure of aforementioned stable, fusant density and die lip gap have guaranteed that the film of extruding has homogeneous thickness;
(3) the uniform film of the thickness of from casting machine, extruding, behind film stretching system and cooling and shaping system drawing and setting, processing grammes per square metre is 40g/m by draw ratio 1.5: 1 (being the ratio that film is stretched)
2The waterproof ventilated membrane finished product, made ventilated membrane is 38 ℃ of temperature, film laterally reaches film centre position moisture vapor transmission such as following table longitudinally under relative humidity 90% condition:
The method of above-mentioned production waterproof ventilated membrane except that above-mentioned embodiment, can also adopt other embodiment, and for example, the time interval that fusant density measurement mechanism 11 detects fusant density can be selected between 10-20s; The time interval that film interlabial gap measurement mechanism 12 is measured the film interlabial gap can be selected between 2-3s.
Claims (10)
1. a casting machine comprises feeding device, screw rod barrel extrusion device, heater and die head, and wherein, the screw rod in the screw rod barrel extrusion device is connected with drive unit; It is characterized in that this casting machine also comprises melt pressure control device, fusant density control device and film interlabial gap control device, wherein:
Described melt pressure control device comprises melt pressure measurement mechanism and pressure feedback control system; Wherein, The melt pressure measurement mechanism is arranged between screw rod barrel extrusion device and the die head, and pressure feedback control system is connected with melt pressure measurement mechanism, heater and drive unit respectively;
Described fusant density control device comprises fusant density tester and density feedback control system; Wherein, The fusant density tester is arranged between screw rod barrel extrusion device and the die head, and the density feedback control system is connected with fusant density tester and feeding device respectively;
Described film interlabial gap control device comprises film interlabial gap measurement mechanism, film interlabial gap adjusting device and gap feedback control system; Wherein, Film interlabial gap measurement mechanism and film interlabial gap adjusting device are arranged on the die head, and the gap feedback control system is connected with film interlabial gap adjusting device with film interlabial gap measurement mechanism respectively.
2. casting machine according to claim 1 is characterized in that, it is same microprocessor that described pressure feedback is controlled system, density feedback control system and gap feedback control system.
3. casting machine according to claim 2 is characterized in that, is connected with vacuum extractor on the described feeding device.
4. casting machine according to claim 3; It is characterized in that, be provided with pressure control container between described screw rod barrel extrusion device and the die head, this pressure control container has a shell; Be provided with 20～50 filter plates in it, have a plurality of holes not of uniform size on each filter plate.
5. casting machine according to claim 3 is characterized in that, described film interlabial gap adjusting device is made up of two groups of electromagnet that are located on the die head, and these two blocks of electromagnet relatively are provided with on the steel plate of film lip one side, have the gap between the two electromagnet opposing end surfaces.
6. casting machine according to claim 3 is characterized in that described feeding device comprises metering feed device and storage bin hopper; Wherein, Metering feed device is made up of 2～5 weighing balances, and storage bin hopper is sealedly connected on the bottom of weighing balance, and described vacuum extractor is connected on this storage bin hopper.
7. casting machine according to claim 3 is characterized in that, described vacuum extractor also is connected with screw rod barrel extrusion device.
8. the method that each casting machine is used to produce waterproof ventilated membrane in the claim 1～7 is characterized in that may further comprise the steps:
(1) adds material through feeding device to casting machine;
(2) material acts as molten condition and extrudes from die head through screw rod barrel extrusion device, in this process,
Pressure feedback control system in the melt pressure control device is according to melt pressure measurement mechanism detected melt pressure signal controlling heater and drive unit, thereby the rotating speed and the casting machine of control screw rod are respectively distinguished temperature, makes melt pressure keep stable;
Density feedback control system in the fusant density control device makes fusant density keep stable according to the reinforced ratio in the fusant density signal controlling feeding device of fusant density tester detection;
Gap feedback control system in the film interlabial gap control device makes the film interlabial gap keep stable according to the detected film interlabial gap of film interlabial gap measurement mechanism signal controlling film interlabial gap adjusting device adjustment film interlabial gap;
(3) film of being extruded by casting machine stretches through the film stretching system and shaping film cooling system typing back forms waterproof ventilated membrane.
9. the method for production waterproof ventilated membrane according to claim 8 is characterized in that, the every interval 10-20s of described fusant density tester measures a fusant density.
10. the method for production waterproof ventilated membrane according to claim 8 is characterized in that, the every interval 2-3s of described film interlabial gap measurement mechanism measures a film interlabial gap.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210204161.3A CN102744819B (en) | 2012-06-19 | 2012-06-19 | Tape casting machine, and method for producing ventilating waterproofing membrane using same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210204161.3A CN102744819B (en) | 2012-06-19 | 2012-06-19 | Tape casting machine, and method for producing ventilating waterproofing membrane using same |
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| CN102744819A true CN102744819A (en) | 2012-10-24 |
| CN102744819B CN102744819B (en) | 2014-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210204161.3A Active CN102744819B (en) | 2012-06-19 | 2012-06-19 | Tape casting machine, and method for producing ventilating waterproofing membrane using same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113492507A (en) * | 2020-03-20 | 2021-10-12 | 吉林金源北方科技发展有限公司 | Intelligent processing method for carbon dioxide copolymer film coating |
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| CN2644137Y (en) * | 2003-07-16 | 2004-09-29 | 广东风华高新科技集团有限公司 | Casting device for dielectric membrane |
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| US20080230945A1 (en) * | 2007-03-20 | 2008-09-25 | Fujifilm Corporation | Solution casting apparatus and solution casting method |
| CN202623109U (en) * | 2012-06-19 | 2012-12-26 | 广州市合诚化学有限公司 | Tape casting machine |
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| JP3234518B2 (en) * | 1995-12-22 | 2001-12-04 | ホーバス・エンジニアリング・アクチェンゲゼルシャフト | Equipment for manufacturing synthetic resin tubes by centrifugal casting |
| CN2644137Y (en) * | 2003-07-16 | 2004-09-29 | 广东风华高新科技集团有限公司 | Casting device for dielectric membrane |
| CN2784166Y (en) * | 2005-04-07 | 2006-05-31 | 比亚迪股份有限公司 | Flow casting and film forming machine |
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| CN113492507A (en) * | 2020-03-20 | 2021-10-12 | 吉林金源北方科技发展有限公司 | Intelligent processing method for carbon dioxide copolymer film coating |
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