CN102049859A - BOPP thin-film production technology for capacitor with multi-layered compound structure - Google Patents
BOPP thin-film production technology for capacitor with multi-layered compound structure Download PDFInfo
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Abstract
The invention discloses a BOPP (Biaxially-oriented Polypropylene) thin-film production technology for a capacitor with a multi-layered compound structure, which solves the problems that the low molecular powder in pellet materials can not be separated during the conventional thin film production process, and the product structure is simple. The thin-film production technology is characterized in that the thin film adopts a multi-layered compound structure, Beta crystal polypropylene raw materials is arranged in the surface layer, and Alpha crystal polypropylene raw materials are arranged in the inner layer. The main technological process adopts the following steps of removing the low molecular powder in the polypropylene raw materials through a blower and a cyclone separator and delivering the polypropylene raw materials into a hopper of an extruding machine; smelting, plasticizing and squeezing out the pellet materials through extruding machines that are arranged in parallel, conveying the pellet materials to a clothes rack shaped multi channel die head, and converging the pellet materials in an outlet die cavity to form the multi-layered compound structure; performing vertical and horizontal stretching and drawing and conducting surface treatment to achieve the thin film with designed thickness; and rolling the finished thin film into a cylinder through a double-station rolling machine. The product has little low molecular content, high mechanical strength, good dielectric property and heat resistance properties and high voltage resistance properties, and can be widely applied to produce different types of capacitors.
Description
One, technical field
The invention belongs to capacitor BOPP thin film fabrication techniques, relate in particular to a kind of multi-layer compound structure capacitor BOPP thin film fabrication techniques
Two, background technology
Existing capacitor all is to adopt the individual layer production technology with the BOPP film, its feeding system is to utilize raw material deadweight feeding or vacuum intake mode, can't the separating particles raw material at the low molecule powder of making, pack, throwing something and feeding, produce in the course of conveying, so that at the casting sheet, vertical draw, horizontally link such as draw to produce too much volatile matter and pollute face and can cause the horizontal film that pulls open, finished product causes mechanical strength decline because of containing more low molecular material; Because of it is a single layer structure, can only use the single prescription of single raw material, being difficult to satisfy simultaneously film following process characteristic requires to require (should have enough surface coarsenings to have enough dielectric strengths and temperature tolerance again), not only production cost height, and poor product quality with final operating characteristic; Simultaneously single layer structure can't be avoided and reduce because of what feed metal ash and other impurity caused and horizontally pull open film and product proof voltage, heat resistance descend, and there is not a secondary structure, tensile stress that product bears is concentrated relatively, and very easily fracture causes in the product following process and scraps.
Three, summary of the invention
Purpose of the present invention is exactly to solve the above-mentioned defective that prior art exists, and a kind of multi-layer compound structure capacitor BOPP thin film fabrication techniques that adopts multilayer prescription, air blast material loading and multi-layer co-extruded mode is provided.
Technical scheme of the present invention is: operation such as it comprises material loading, extrudes, stretching and drawing and rolling, film is a multi-layer compound structure, skin-material adopts the high pp material of beta crystal degree of crystallinity, and consumption is 10～15% of a raw material total amount, and forming product subsurface thickness is 0.4～1.5 μ m; Internal layer uses the high pp material of alpha-crystal form degree of crystallinity, and consumption is 85～90% of a raw material total amount, and forming the interior layer thickness of product is 3～12 μ m; Its technological process of production is as follows:
(1) purifies material loading: between material loading, be provided with the feeding system purifier, this feeding system purifier is made of the dog-house, rotation feeder and air blast, conveyance conduit and the extruder hopper that are arranged in the clean room, inlet is provided with Airshower chamber in the clean room, in the Airshower chamber is circulated air, through efficient strainer filtering; The infundibulate dog-house is set in the clean room; the rotation feeder is installed in the below of dog-house; its discharging opening links to each other with the air outlet of air blast by pipeline one end; be provided with high efficiency particulate air filter before the air inlet of air blast; the other end links to each other by the charging aperture of conveyance conduit with the cyclone separator of setting up; the discharging opening of described cyclone separator places on the extruder hopper, and the top is provided with powder outlet, links to each other with the powder collection bag by pipeline.At first with two kinds of raw materials after Airshower chamber removes external packing by the additive bin input, through the rotation feeder transfer to conveyance conduit with stable flow rate, by air blast and cyclone separator pure pellet is sent into table, internal layer extruder hopper respectively;
(2) multi-layer co-extruded: as to adopt top layer extruder, internal layer extruder and a multichannel die, table, inner layer granule material enter table, internal layer extruder from hopper respectively, temperature is controlled at 220 ℃～250 ℃ in the extruder barrel, particulate material is carried out fusion, plasticizing, and clothes rack shape multichannel die temperature is controlled between 240 ℃～250 ℃; And by extruder clothes rack shape multichannel die of the continuous simultaneously injection of melt with two kinds of raw materials, each runner is installed high-precision pressure sensor respectively in this die head, by each laminar flow amount of the stable control of PLC, thereby guarantee each layer relative thickness and prevent the interlayer crossfire, form the laminar fluid of a MULTILAYER COMPOSITE, it is in blocks to be able to cooled and solidified by sharp cooling roll and high pressure air knife, described sharp cooling roll inwall passes to 90～110 ℃ recirculated water, the high pressure air knife provides 150mbar, 60～80 ℃ compressed air by air blast, and condensate film enters the longitudinal stretching link;
(3) stretching and drawing: successively adopt longitudinal stretching machine, cross directional stretch machine that the cooled and solidified thin slice is stretched.Longitudinal stretching preheating roller tube temperature is controlled at 120～138 ℃, and the temperature of stretching roller is controlled at 137～150 ℃, and the shaping roller tube temperature is controlled at 144～150 ℃, and draw ratio is 4.6～5.2; The temperature of cross directional stretch preheating zone is controlled at 167～172 ℃, and the temperature of drawing zone is controlled at 160～168 ℃, and the temperature of shaping area is controlled at 170～175 ℃, and draw ratio is 8～10.Adopt cooling and shaping roller, rim charge cutting knife, infrared gauge and corona unit that film is handled then, form finished film;
(4) rolling: adopt the double winder, winder cooperates touch roll to batch finished film by steel core.
The invention has the beneficial effects as follows: owing to adopt air blast feeding purifier, can remove raw material effectively at the low molecule powder of making, packing, throw something and feed and course of conveying produces, guaranteed the macromolecule primary structure of product, thereby improved the mechanical strength of product, avoided product to produce low molecular weight volatile thing pollution face in process of production simultaneously and caused rupture of membranes and face poor adhesive force; Multi-layer co-extruded hybrid system is divided into multilayer with product structure, disperse effectively and weakened the product structure defective that metal ash and other impurity cause in the raw material, reduced the rupture of membranes factor, promoted the dielectric strength (improving 70V/um) of product simultaneously, and the secondary structure that forms product can be decomposed tensile break stress effectively, significantly improve its mechanical strength (improve 15%), guarantee that following process carries out smoothly, thereby improved finished product rate and quality; The unique formula of different qualities raw material is used in layering, the raw material that melt index is big, beta crystal degree of crystallinity is high is used on the top layer, guaranteed the coarse surface that product is good, internal layer uses the high dielectric property that melt index is little, raw material that alpha-crystal form degree of crystallinity is high has guaranteed product, make full use of raw material usefulness, thereby reduced production cost, improved product quality simultaneously effectively.
Four, description of drawings
Below in conjunction with accompanying drawing the present invention is further described.
Fig. 1 is a technological process block-diagram of the present invention;
Fig. 2 is a feed clarification system structural representation of the present invention.
Among the figure: 1 is dog-house, and 2 are the rotation feeder, and 3 is the clean room, and 4 is Airshower chamber, and 5 is air blast, and 6 is high efficiency particulate air filter, and 7 is the extruder hopper, and 8 is cyclone separator, and 9 is the powder collection bag.
Five, the specific embodiment
As Fig. 1, shown in Figure 2, to produce thickness is that 3～15 μ m multi-layer compound structure capacitors are example with the BOPP film, on the production equipment basis that produces the ordinary packing plastic sheeting, extruder die is replaced by the clothes rack shape multichannel die, and many extruders are set, the feed clarification system was set before every extruder feed hopper, described feed clarification system is by the dog-house 1 that is arranged in the clean room 3, rotation feeder 2 and air blast 5, conveyance conduit and extruder hopper 7 constitute, 3 inlets are provided with Airshower chamber 4 in the clean room, in the Airshower chamber is circulated air, through efficient strainer filtering; Infundibulate dog-house 1 is set in the clean room 3, rotation feeder 2 is installed in the below of dog-house, its discharging opening links to each other with the air outlet of air blast 5 by pipeline one end, be provided with high efficiency particulate air filter 6 before the air inlet of air blast, the other end links to each other by the charging aperture of conveyance conduit with the cyclone separator of setting up 8, the discharging opening of described cyclone separator 8 places on the extruder hopper 7, and the top is provided with powder outlet, links to each other with powder collection bag 9 by pipeline; The top layer extruder all links to each other with the clothes rack shape multichannel die with the internal layer extruder.Implement when of the present invention, at first the pp material that the alpha-crystal form degree of crystallinity used of pp material that the beta crystal degree of crystallinity that the top layer is used is high (account for raw material total amount 10～15%) and internal layer is high (account for raw material total amount 85～90%) is dropped into respectively by additive bin 1 after the Airshower chamber of auto purification chamber 3 inlets removes external packing respectively, transfers to feed system with stable flow rate through rotating feeder 2.Again by air blast 5 with raw material in conveyance conduit is blown into cyclone separator 8, isolate the powder outlet of low molecule powder by its top, be recycled in the powder collection bag 9, pure pellet enters top layer extruder hopper and internal layer extruder hopper respectively by its deadweight.After particulate material enters extruder from hopper, in extruder barrel, be warming up to 220 ℃～250 ℃ and fusion, plasticizing by heater, and by extruder screw clothes rack shape multichannel die of the continuous simultaneously injection of melt with two kinds of raw materials, and high-precision pressure sensor is installed respectively at each runner, by each laminar flow amount of the stable control of PLC, thereby guarantee each layer relative thickness and prevent the interlayer crossfire.This die head is heated to 240 ℃～250 ℃ by heater, and top layer melt and internal layer melt converge in its outlet die cavity through the die head runner, and under the extruding of extruder, from mouthful outflow of clearing partially of die head, forms the laminar fluid of a MULTILAYER COMPOSITE.After laminar fluid flows out die head, the compressed air that is blown out by high pressure air knife (providing 150mbar, 60～80 ℃ compressed air by air blast) fits tightly on the sharp cooling roll surface, this sharp cooling roll inwall passes to 90～110 ℃ recirculated water, it is in blocks to be able to cooled and solidified, and in sheet, form certain crystal structure, draw by the deflector roll behind the sharp cooling roll then, enter the longitudinal stretching link.At first adopt and form longitudinal stretching machine by preheating roller tube, stretching roller and shaping roller tube three parts and carry out longitudinal stretching, all heat in the roller by recycle oil, the preheating roller tube temperature is controlled at 120～138 ℃, the temperature of stretching roller is controlled at 137～150 ℃, the shaping roller tube temperature is controlled at 144～150 ℃, and draw ratio is 4.6～5.2..The casting sheet is subjected to thermal softening, stretching and typing through roller surface, forms thinner sheet material, introduces the cross directional stretch link by deflector roll.And then carry out cross directional stretch, and adopting and form the cross directional stretch machine by preheating, stretching and thermal finalization three districts, each district is hot-air air blast heating.The temperature of preheating zone is controlled at 167～172 ℃, and the temperature of drawing zone is controlled at 160～168 ℃, and the temperature of shaping area is controlled at 170～175 ℃, and draw ratio is 8～10; It is that 0.4～1.5 μ m, interior layer thickness are 3～12 μ m target thickness films that thin slice preheating in the cross directional stretch machine, stretching, typing become skin depth.This film is introduced traction element by deflector roll, adopts cooling and shaping roller, rim charge cutting knife, infrared gauge and corona unit etc. to handle.Cooling and shaping roller inwall passes to 20～28 ℃ recirculated water; The power of corona unit is controlled at 15～20kw.The film of target thickness at first passes through the roller surface cooling and shaping at traction element, cut away the limit portion that does not stretch by the rim charge cutting knife again, reach target width simultaneously, do the surface through corona processor then and handle, make the surface tension of film reach 42 dyne, introduce the rolling link by deflector roll at last.Infrared gauge in time manually or is automatically adjusted the die openings profile by the actual (real) thickness of online detection side cut rear film, to eliminate or to reduce film gauge variation.The finished films that obtains adopts the double winder to carry out rolling, and winder cooperates touch roll to batch finished film by steel core.Reaching the finished film of target thickness and target width, is 23～30kg at rolling tension force, and touch roll pressure is to be rolled into tubular by the winder steel core under the process conditions of 42～49kg, and finished film is rolled up about the heavy 600kg of every volume.
The multi-layer compound structure capacitor BOPP film that the present invention produced, it is few to have low molecule content, mechanical strength height (higher by 15%) than normal film, and the no volatile matter in surface pollutes, do not have in the production process and lowly divide volatile matter to pollute and cause that rupture of membranes scraps phenomenon, thereby improved productivity ratio and product quality; Multi-layer compound structure disperses effectively and has weakened the interior ash of raw material and caused the product structure defective with other impurity, has reduced rupture of membranes in the production process, and has improved its dielectric strength (exceeding 70V/um than normal film); The unique formula of layering batching makes product both have good coarse surface, has strong heatproof, high voltage withstanding characteristic again, has guaranteed the properties for follow and the final serviceability of product simultaneously.In a word, use of the present invention can reduce production costs effectively, enhances productivity, guarantees that product is high-quality.
Claims (3)
1. multi-layer compound structure capacitor BOPP thin film fabrication techniques, it comprises material loading, extrude, stretching and drawing and winding process, it is characterized in that: film is a multi-layer compound structure, skin-material adopts the high pp material of beta crystal degree of crystallinity, consumption is 10～15% of a raw material total amount, and forming product subsurface thickness is 0.4～1.5 μ m; Internal layer uses the high pp material of alpha-crystal form degree of crystallinity, and consumption is 85～90% of a raw material total amount, and forming the interior layer thickness of product is 3～12 μ m; Its technological process of production is as follows:
(1) purifies material loading: between material loading, be provided with the feeding system purifier, at first with two kinds of raw materials after Airshower chamber removes external packing by the additive bin input, transfer to conveyance conduit with stable flow rate through the rotation feeder, pure pellet is sent into table, internal layer extruder hopper respectively by air blast and cyclone separator;
(2) multi-layer co-extruded: as to adopt top layer extruder, internal layer extruder and a multichannel die, table, inner layer granule material enter table, internal layer extruder from hopper respectively, the fusion by the heater intensification, plasticizing in extruder barrel, and by extruder clothes rack shape multichannel die of the continuous simultaneously injection of melt with two kinds of raw materials, form the laminar fluid of a MULTILAYER COMPOSITE, it is in blocks to be able to cooled and solidified by sharp cooling roll and high pressure air knife, enters the longitudinal stretching link;
(3) stretching and drawing: successively adopt longitudinal stretching machine, cross directional stretch machine that the cooled and solidified thin slice is stretched, adopt cooling and shaping roller, rim charge cutting knife, infrared gauge and corona unit that film is handled then, form finished film;
(4) rolling: adopt the double winder, winder cooperates touch roll to batch finished film by steel core.
2. multi-layer compound structure capacitor BOPP thin film fabrication techniques according to claim 1, it is characterized in that: described feeding system purifier is made of the dog-house (1), rotation feeder (2) and air blast (5), conveyance conduit and the extruder hopper (7) that are arranged in the clean room (3), (3) inlet is provided with Airshower chamber (4) in the clean room, in the Airshower chamber is circulated air, through efficient strainer filtering; Infundibulate dog-house (1) is set in the clean room (3); rotation feeder (2) is installed in the below of dog-house; its discharging opening links to each other with the air outlet of air blast (5) by pipeline one end; be provided with high efficiency particulate air filter (6) before the air inlet of air blast; the other end links to each other by the charging aperture of conveyance conduit with the cyclone separator of setting up (8); the discharging opening of described cyclone separator (8) places on the extruder hopper (7), and the top is provided with powder outlet, links to each other with powder collection bag (9) by pipeline.
3. multi-layer compound structure capacitor BOPP thin film fabrication techniques according to claim 1 and 2, it is characterized in that: temperature is controlled at 220 ℃～250 ℃ in the extruder barrel, particulate material is carried out fusion, plasticizing, and clothes rack shape multichannel die temperature is controlled between 240 ℃～250 ℃; The sharp cooling roll inwall passes to 90～110 ℃ recirculated water; The high pressure air knife provides 150mbar, 60～80 ℃ compressed air by air blast; Longitudinal stretching preheating roller tube temperature is controlled at 120～138 ℃, and the temperature of stretching roller is controlled at 137～150 ℃, and the shaping roller tube temperature is controlled at 144～150 ℃, and draw ratio is 4.6～5.2; The temperature of cross directional stretch preheating zone is controlled at 167～172 ℃, and the temperature of drawing zone is controlled at 160～168 ℃, and the temperature of shaping area is controlled at 170～175 ℃, and draw ratio is 8～10.
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| CN102501387A (en) * | 2011-12-28 | 2012-06-20 | 宁波大东南万象科技有限公司 | Preparation method of corona-treated polypropylene coarsened capacitor film |
| CN102543432A (en) * | 2011-12-28 | 2012-07-04 | 宁波大东南万象科技有限公司 | Preparation method of double-side metallized polypropylene capacitor film |
| CN103434110A (en) * | 2013-08-30 | 2013-12-11 | 华威聚酰亚胺有限责任公司 | High-performance polypropylene film for heavy-current capacitors and manufacturing method thereof |
| CN105793937A (en) * | 2013-12-03 | 2016-07-20 | Abb技术有限公司 | Multi-layered dielectric polymer material, capacitor, use of the material and formation method thereof |
| CN108045052A (en) * | 2017-12-19 | 2018-05-18 | 西安交通大学 | A kind of improved multilayer structure polypropylene film and preparation method thereof |
| CN108116021A (en) * | 2017-12-19 | 2018-06-05 | 西安交通大学 | A kind of multilayered structure polypropylene film and preparation method thereof |
| CN109080105A (en) * | 2018-09-21 | 2018-12-25 | 江苏宗亮新材料有限公司 | The feeding device of four layers of coextrusion casting film device |
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| CN108045052A (en) * | 2017-12-19 | 2018-05-18 | 西安交通大学 | A kind of improved multilayer structure polypropylene film and preparation method thereof |
| CN108116021A (en) * | 2017-12-19 | 2018-06-05 | 西安交通大学 | A kind of multilayered structure polypropylene film and preparation method thereof |
| CN108116021B (en) * | 2017-12-19 | 2019-01-15 | 西安交通大学 | A kind of multilayered structure polypropylene film and preparation method thereof |
| CN108045052B (en) * | 2017-12-19 | 2019-02-01 | 西安交通大学 | A kind of improved multilayer structure polypropylene film and preparation method thereof |
| CN109080105A (en) * | 2018-09-21 | 2018-12-25 | 江苏宗亮新材料有限公司 | The feeding device of four layers of coextrusion casting film device |
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