CN102049859B - 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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- CN102049859B CN102049859B CN2010105417200A CN201010541720A CN102049859B CN 102049859 B CN102049859 B CN 102049859B CN 2010105417200 A CN2010105417200 A CN 2010105417200A CN 201010541720 A CN201010541720 A CN 201010541720A CN 102049859 B CN102049859 B CN 102049859B
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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 film production method.
Two, background technology
Existing capacitor is all 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 course of conveying, so that in slab, vertical draw, the horizontal link such as draw produces too much volatile matter and pollutes face and can cause the horizontal film that pulls open, finished product causes mechanical strength decline because containing more low molecular material; Because it is single layer structure, can only use the single formula of single raw material, be difficult to satisfy simultaneously film following process characteristic requirements and final operating characteristic requirement (should have enough surface coarsenings to have again enough dielectric strengths and temperature tolerance), not only production cost is high, and poor product quality; Simultaneously single layer structure can't be avoided and reduce and horizontally pull open film and product proof voltage, heat resistance descend because of what feed metal ash and other impurity caused, and without secondary structure, tensile stress that product bears is relatively concentrated, and very easily fracture, cause in the product following process and scrap.
Three, summary of the invention
Purpose of the present invention is exactly to solve the defects that prior art exists, and a kind of multi-layer compound structure capacitor BOPP film production method that adopts multilayer formula, air blast material loading and multi-layer co-extruded mode is provided.
Technical scheme of the present invention is: the operation such as it comprises material loading, extrudes, stretching and drawing and rolling, film is multi-layer compound structure, skin-material adopts the high pp material of beta crystal degree of crystallinity, and consumption is 10～15% of 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 raw material total amount, and forming product internal layer thickness is 3～12 μ m; Its technological process of production is as follows:
(1) purify material loading: be provided with the feeding system purifier between material loading, 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, entrance arranges Airshower chamber in the clean room, be circulated air in Airshower chamber, through the high-efficient filter net filtration; The infundibulate dog-house is set in the clean room; the rotation feeder is installed in the below of dog-house; its discharging opening is connected 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 is connected by the charging aperture of conveyance conduit with the cyclone separator of setting up; the discharging opening of described cyclone separator is placed on the extruder hopper, and the top is provided with powder outlet, is connected with the powder collection bag by pipeline.At first two kinds of raw materials are dropped into by additive bin after Airshower chamber removes external packing, transfer to conveyance conduit with stable flow through the rotation feeder, by air blast and cyclone separator, pure pellet is sent into respectively table, internal layer extruder hopper;
(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, in extruder barrel, temperature is controlled at 220 ℃～250 ℃, particulate material is carried out melting, plasticizing, and clothes rack shape multichannel die temperature is controlled between 240 ℃～250 ℃; And by extruder, the melt while of two kinds of raw materials is injected a clothes rack shape multichannel die continuously, in this die head, each runner is installed respectively high-precision pressure sensor, stablize by PLC each laminar flow amount of controlling, thereby guarantee crossfire between each layer relative thickness and preventing layer, form the laminar fluid of a MULTILAYER COMPOSITE, be able to cooled and solidified by sharp cooling roll and high pressure air knife in blocks, described sharp cooling roll inwall passes to the recirculated water of 90～110 ℃, the high pressure air knife provides 150mbar, the compressed air of 60～80 ℃ by air blast, and condensate film enters the longitudinal stretching link;
(3) stretching and drawing: successively adopt longitudinal stretching machine, transverse drawing mill 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.Then adopt cooling and shaping roller, rim charge cutting knife, infrared gauge and corona unit that film is processed, form finished film;
(4) rolling: adopt double-position winding machine, winder coordinates touch roll to batch finished film by steel core.
The invention has the beneficial effects as follows: owing to adopting air blast feeding purifier, can effectively remove raw material 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 simultaneously product to produce in process of production low molecular weight volatile thing pollution face and caused rupture of membranes and face poor adhesive force; Multi-layer co-extruded hybrid system is divided into multilayer with product structure, effectively disperse and weakened the product structure defective that in raw material, metal ash and other impurity cause, reduced the rupture of membranes factor, promoted simultaneously the dielectric strength (improving 70V/um) of product, 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 large, 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, take full advantage of raw material usefulness, thereby reduced production cost, effectively improved product quality simultaneously.
Four, description of drawings
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is technological process block-diagram of the present invention;
Fig. 2 is feed clarification system structural representation of the present invention.
In 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, take produce thickness as 3～15 μ m multi-layer compound structure capacitors with the BOPP film as example, producing on the production equipment basis of 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 clean room 3, rotation feeder 2 and air blast 5, conveyance conduit and extruder hopper 7 consist of, 3 entrances arrange Airshower chamber 4 in the clean room, be circulated air in Airshower chamber, through the high-efficient filter net filtration, the interior infundibulate dog-house 1 that arranges in clean room 3, rotation feeder 2 is installed in the below of dog-house, its discharging opening is connected 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 is connected by the charging aperture of conveyance conduit with the cyclone separator 8 of setting up, the discharging opening of described cyclone separator 8 is placed on extruder hopper 7, and the top is provided with powder outlet, is connected with powder collection bag 9 by pipeline, the top layer extruder all is connected 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 that the pp material that the beta crystal degree of crystallinity of the top layer being used is high (account for raw material total amount 10～15%) and internal layer use is high (account for raw material total amount 85～90%) Airshower chamber of auto purification chamber 3 entrances is respectively dropped into respectively by additive bin 1 after removing external packing, transfers to feed system with stable flow through rotating feeder 2.Again by air blast 5 with raw material in conveyance conduit is blown into cyclone separator 8, isolate low molecule powder by the powder outlet at its top, be recycled in powder collection bag 9, pure pellet enters respectively top layer extruder hopper and internal layer extruder hopper by its deadweight.After particulate material enters extruder from hopper, be warming up to 220 ℃～250 ℃ and melting, plasticizing by heater in extruder barrel, and by extruder screw, the melt while of two kinds of raw materials is injected a clothes rack shape multichannel die continuously, and at each runner, high-precision pressure sensor is installed respectively, stablize by PLC and control each laminar flow amount, thereby guarantee crossfire between each layer relative thickness and preventing layer.This die head is heated to 240 ℃～250 ℃ by heater, and top layer melt and internal layer melt close at its outlet die cavity internal exchange through the die head runner, and under the extruding of extruder, from mouthful outflow of partially clearing of die head, forms the laminar fluid of a MULTILAYER COMPOSITE.After laminar flow goes out die head, the compressed air that is blown out by high pressure air knife (providing 150mbar, the compressed air of 60～80 ℃ by air blast) fits tightly on the sharp cooling roll surface, this sharp cooling roll inwall passes to the recirculated water of 90～110 ℃, be able to cooled and solidified in blocks, and form certain crystal structure in sheet, then drawn by the deflector roll after sharp cooling roll, 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 by recycle oil in roller, 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..Slab 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 by preheating, stretching and thermal finalization 3rd district to form transverse drawing mill, each is distinguished and is the hot-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, internal layer thickness are 3～12 μ m target thickness films that thin slice preheating in transverse drawing mill, 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 process.Cooling and shaping roller inwall passes to the recirculated water of 20～28 ℃; The power of corona unit is controlled at 15～20kw.At first the film of target thickness passes through the roller surface cooling and shaping at traction element, cut away by the rim charge cutting knife limit section that does not stretch again, reach simultaneously target width, then do the surface through corona processor and process, 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 online actual (real) thickness that detects the trimming rear film, to eliminate or to reduce film gauge variation.The finished films that obtains adopts double-position winding machine to carry out rolling, and winder coordinates touch roll to batch finished film by steel core.Reaching the finished film of target thickness and target width, is 23～30kg at winding tension, and touch roll pressure is to be rolled into tubular by the winder steel core under the process conditions of 42～49kg, the heavy 600kg of the every volume of finished film volume left and right.
The multi-layer compound structure capacitor BOPP film that the present invention produces, has low molecule content few, mechanical strength high (higher by 15% than normal film), the non-volatile thing in surface pollutes, pollute without low minute volatile matter in production process and cause that rupture of membranes scraps phenomenon, thereby having improved productivity ratio and product quality; Multi-layer compound structure effectively disperses and has weakened the interior ash of raw material and caused the product structure defective with other impurity, has reduced rupture of membranes in 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 again stronger heatproof, high voltage withstanding characteristic, has guaranteed simultaneously properties for follow and the final serviceability of product.In a word, use of the present invention can reduce production costs effectively, enhances productivity, guarantees that product is high-quality.
Claims (2)
1. multi-layer compound structure capacitor BOPP film production method, it comprises material loading, extrude, stretching and drawing and winding process, it is characterized in that: film is multi-layer compound structure, skin-material adopts the high pp material of beta crystal degree of crystallinity, consumption is 10～15% of 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 raw material total amount, and forming product internal layer thickness is 3～12 μ m; Its technological process of production is as follows:
(1) purify material loading: be provided with the feeding system purifier between material loading, at first two kinds of raw materials after removing external packing, are dropped into by additive bin Airshower chamber, transfer to conveyance conduit with stable flow through the rotation feeder, by air blast and cyclone separator, pure pellet is sent into respectively table, internal layer extruder hopper;
(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 melting by the heater intensification, plasticizing in extruder barrel, and by extruder, the melt while of two kinds of raw materials is injected a clothes rack shape multichannel die continuously, form the laminar fluid of a MULTILAYER COMPOSITE, be able to cooled and solidified by sharp cooling roll and high pressure air knife in blocks, enter the longitudinal stretching link;
(3) stretching and drawing: successively adopt longitudinal stretching machine, transverse drawing mill that the cooled and solidified thin slice is stretched, then adopt cooling and shaping roller, rim charge cutting knife, infrared gauge and corona unit that film is processed, form finished film;
(4) rolling: adopt double-position winding machine, winder coordinates touch roll to batch finished film by steel core.
2. multi-layer compound structure capacitor BOPP film production method according to claim 1, it is characterized in that: in extruder barrel, temperature is controlled at 220 ℃～250 ℃, particulate material is carried out melting, plasticizing, and clothes rack shape multichannel die temperature is controlled between 240 ℃～250 ℃; The sharp cooling roll inwall passes to the recirculated water of 90～110 ℃; The high pressure air knife provides 150mbar, the compressed air of 60～80 ℃ 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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| CN102543432B (en) * | 2011-12-28 | 2013-09-04 | 宁波大东南万象科技有限公司 | Preparation method of double-side metallized polypropylene capacitor film |
| CN102501387B (en) * | 2011-12-28 | 2014-01-01 | 宁波大东南万象科技有限公司 | Preparation method of corona-treated polypropylene coarsened capacitor film |
| CN103434110B (en) * | 2013-08-30 | 2016-09-07 | 华威聚酰亚胺有限责任公司 | A kind of forceful electric power capacitor high-performance polypropylene film and manufacture method thereof |
| CN105793937B (en) * | 2013-12-03 | 2020-09-15 | Abb电网瑞士股份公司 | Multilayered dielectric polymer material, capacitor, use of material and method of forming same |
| 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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Denomination of invention: Production method of BOPP film for multilayer composite structure capacitor Effective date of registration: 20220323 Granted publication date: 20130515 Pledgee: Huanggang financing guarantee Group Co.,Ltd. Pledgor: HUBEI LONGCHEN TECHNICAL JOINT-STOCK Co.,Ltd. Registration number: Y2022420000072 |
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