CN111873281B - High-voltage generator for width expanding and thinning of cast PVDF (polyvinylidene fluoride) fluorine film and using method thereof - Google Patents
High-voltage generator for width expanding and thinning of cast PVDF (polyvinylidene fluoride) fluorine film and using method thereof Download PDFInfo
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- CN111873281B CN111873281B CN202010712181.6A CN202010712181A CN111873281B CN 111873281 B CN111873281 B CN 111873281B CN 202010712181 A CN202010712181 A CN 202010712181A CN 111873281 B CN111873281 B CN 111873281B
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- pvdf fluorine
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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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
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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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/16—PVDF, i.e. polyvinylidene fluoride
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
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- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
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Abstract
The invention relates to the technical field of PVDF fluorine films, in particular to a high-voltage generator for widening and thinning a cast PVDF fluorine film and a using method thereof. The high-voltage generator for widening and thinning the cast PVDF fluorine film comprises a high-voltage generator body, wherein two sides of the high-voltage generator body are connected with electrode rods through electric conduction. The method has great effects in widening and thinning PVDF fluorine films, particularly crosslinking PE (polyethylene) and the like which cannot be recycled in the market, and can be used for improving the input-output rate and manufacturing ultra-large-width film materials and film materials with uniform thickness.
Description
Technical Field
The invention relates to a method for preventing a casting film from being reduced in width and thickened after flowing out of a die lip, in particular to a method for widening and thinning the casting PVDF fluorine film.
Background
The curtain coating membrane is from the die lip back of flowing out, present a half molten state, before the contact chill roll, the shrink can appear in the film, promptly "necking down phenomenon", cause the broad width of curtain coating to diminish, simultaneously fluorine membrane under the molten condition, extrude the die lip after, the condition of thickness thickening can appear, the condition of membrane material both ends thickening is more serious, even compress tightly expansion nut, still thickness is thick partially, can only excise, when producing the fluorine membrane that is close to the die head size, because "necking down phenomenon" and the big phenomenon of extrusion swell, can't realize production, even produce normal size fluorine membrane, because the existence of the big phenomenon of extrusion swell, cut edge must have certain width, otherwise can produce "stick up the limit", can't use.
In actual production, a 1300mm wide casting die head is taken as an example to produce a fluorine film with a special size, for example 1110mm, and considering that the width of a die lip of a casting line is 1300mm, even if an upper main roller is adopted, namely the distance between the die lip and the main roller is reduced, and a compounding frame is moved towards the cylinder direction, the production of the fluorine film with the width of 1100mm cannot be realized due to the necking phenomenon.
When the casting equipment can produce wide fluorine films within a range, in order to achieve uniform thickness, in the past, in order to save the cost of trimming scraps, a method of compacting and expanding nuts is often adopted for production, but the problem of 'broken edges' caused by unsmooth flow of molten materials is often caused.
Disclosure of Invention
The invention aims to solve the defects and provides a high-voltage generator for widening and thinning a cast PVDF fluorine film and a using method thereof.
In order to overcome the defects in the background art, the technical scheme adopted by the invention for solving the technical problems is as follows: the high-voltage generator for widening and thinning the cast PVDF fluorine film comprises a high-voltage generator body, wherein two sides of the high-voltage generator body are connected with electrode rods through electric conduction.
The method for widening the casting PVDF fluorine film by using the high-pressure generator comprises the steps of drying raw materials at the temperature of 70 ℃ for 2 hours, sucking the raw materials into an extruder, and extruding and casting the PVDF fluorine film at the die lip of a die head through high-temperature melting, plasticizing and homogenizing of a screw rod of the extruder at the temperature of 200 ℃, wherein the method comprises the following steps:
firstly, placing a high-voltage discharge device on a die lip on an extruder platform, wherein two sides of the high-voltage discharge device are connected with electrode rods;
secondly, respectively placing 2 electrode rods at the positions 2cm away from the surface of the PVDF fluorine film, wherein the electrode rods are positioned at the left side and the right side of the die lip and are positioned at the positions 1-3cm away from the right lower opening of the die lip;
thirdly, starting a power supply of the high-voltage discharge device, wherein the power of the high-voltage discharge voltage is 30KV, so that the PVDF fluorine film is rapidly widened;
fourthly, adjusting an expansion screw on the die lip to change the outflow quantity of the PVDF fluorine film material at the electric shock point, so that the thickness of the PVDF fluorine film reaches the normal width;
fifthly, the extruded film passes through a main roller with the temperature of 70 ℃, is gradually cooled and shaped through a rubber roller and a steel roller, and enters a winding unit after the corona treatment of the surface of the film of 1.6 KW;
and sixthly, after the film material enters the winding unit, using a cutter to perform edge cutting treatment, and finishing winding the film material in the winding unit.
A method for casting a PVDF fluorine film to be thinned by a high-pressure generator is characterized in that raw materials are dried for 2 hours at the temperature of 70 ℃, sucked into an extruder, and a normal-width casting PVDF fluorine film is extruded at the die lip of a die head through high-temperature melting, plasticizing and homogenizing of a screw rod of the extruder at the temperature of 200 ℃, and the method comprises the following steps:
firstly, placing a high-voltage discharge device on a platform of an extruder and at a die lip, wherein two sides of the high-voltage discharge device are connected with electrode bars;
fourthly, respectively placing 2 electrode rods at the width edge of the PVDF fluorine membrane, wherein the distance between the electrode rods and the surface of the PVDF fluorine membrane is 1-3cm;
fifthly, starting a power supply of a high-voltage discharge device, wherein the power of the high-voltage discharge voltage is 10KV, and treating the PVDF fluorine film in a semi-molten state;
sixthly, after the PVDF fluorine film edge processed in the fifth step becomes thin rapidly, adjusting the power of high-voltage discharge voltage to enable the thickness of the rim charge to be uniform, wherein the power variation range is 0-5kv;
seventhly, the extruded film passes through a main roller with the temperature of 70 ℃, is gradually cooled and shaped through a rubber roller and a steel roller, is subjected to corona treatment on the surface of the film with the pressure of 1.6kw, and enters a winding unit;
and eighthly, after the film material enters the winding unit, using a cutter to perform edge cutting treatment, and finishing winding of the film material in the winding unit.
According to another embodiment of the present invention, the sixth operation is further included while adjusting the expansion screw on the die lip, so as to reduce the extrusion of the edge point and realize a substantial reduction of the thickness of the edge material.
The beneficial effects of the invention are: the high-voltage discharge device has great effect in widening and thinning PVDF fluorine membranes, particularly in crosslinked PE (polyethylene) and the like which cannot be recycled as rim charge in the market, and can improve the input-output rate and manufacture ultra-large-width membrane materials and membrane materials with uniform thickness.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic view of a high voltage discharge apparatus according to the present invention;
FIG. 2 is a schematic structural diagram of a state that a PVDF fluorine film needing to be widened is cast out of a die lip;
FIG. 3 is a schematic structural diagram of a PVDF fluorine membrane after widening;
wherein: 1. the high-voltage generator comprises a high-voltage generator body 2, an electrode rod 3, a die lip 4 and a PVDF fluorine film.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the high voltage discharge apparatus includes a high voltage generator body 1, and both sides of the high voltage generator body 1 are connected to electrode rods 2 through conduction. Due to the particularity of the PVDF fluorine membrane production process, the high-voltage discharge device is directly acted on the membrane to improve the input-output rate of fluorine membrane production and the production of large-width fluorine membranes, and meanwhile, the high-voltage discharge device has a huge effect on crosslinked PE and the like which cannot be recycled particularly by rim charge in the market, and helps people to improve the input-output rate and manufacture the membrane material with ultra-large width.
Examples
A method for expanding the width of a casting PVDF fluorine film by a high-pressure generator comprises the steps of drying raw materials for 2 hours at the temperature of 70 ℃, sucking the raw materials into an extruder, and extruding and casting a PVDF fluorine film 4 at the die lip of a die head through high-temperature melting, plasticizing and homogenizing of a screw rod of the extruder at the temperature of 200 ℃, wherein the method comprises the following steps:
firstly, placing a high-voltage discharge device on a die lip on an extruder platform, wherein two sides of the high-voltage discharge device are connected with electrode rods 2;
secondly, respectively placing 2 electrode rods 2 at the positions 2cm away from the surface of the PVDF fluorine film 4 at the left side and the right side of the die lip 3 and the position 2cm away from the right lower opening of the die lip;
thirdly, starting a power supply of the high-voltage discharge device, wherein the power of the high-voltage discharge voltage is 30KV, so that the PVDF fluorine membrane 4 is rapidly widened;
fourthly, because the thickness of the electric shock point can be changed at the same time, the outflow quantity of the PVDF fluorine membrane 4 material of the electric shock point is changed by adjusting an expansion screw on the die lip, so that the thickness of the PVDF fluorine membrane 4 reaches the normal width;
fifthly, the extruded film passes through a main roller with the temperature of 70 ℃, is gradually cooled and shaped through a rubber roller and a steel roller, is subjected to corona treatment on the surface of the film with the pressure of 1.6kw, and enters a winding unit;
and sixthly, after the membrane material enters the winding unit, using a cutter to perform trimming treatment, and finishing winding the membrane material in the winding unit.
In actual production, although widening curtain coating PVDF fluorine membrane also can reach through changing not unidimensional die head, but change the die head not only the input cost height, also must not reach production standard in addition, the die lip can not be changed to some old equipment of following, widens curtain coating PVDF fluorine membrane through using high pressure generator on old equipment, promotes input-output rate and makes the membrane material of super large width.
As shown in fig. 2 and 3, the high-pressure generator is used for assisting in proper power output to realize the reconstruction of the rim charge, and the rim charge is artificially manufactured, so that the width of the product reaches 1140mm before trimming.
Examples
A method for casting a PVDF fluorine film to be thinned by a high-pressure generator is characterized in that raw materials are dried for 2 hours at the temperature of 70 ℃, sucked into an extruder, and a normal-width casting PVDF fluorine film is extruded at the die lip of a die head through high-temperature melting, plasticizing and homogenizing of a screw rod of the extruder at the temperature of 200 ℃, and the method comprises the following steps:
firstly, a high-voltage discharge device is arranged on a platform of the extruder and positioned at a die lip 3, two sides of the high-voltage discharge device are connected with electrode rods 2, the electrode rods 2 can be arranged on a bracket,
fourthly, respectively placing 2 electrode rods at the width edge of the PVDF fluorine membrane, wherein the distance between the electrode rods and the surface of the PVDF fluorine membrane is 1-3cm;
fifthly, starting a power supply of a high-voltage discharge device, wherein the power of the high-voltage discharge voltage is 10KV, and treating the PVDF fluorine film in a semi-molten state;
sixthly, after the PVDF fluorine film edge processed in the fifth step becomes thin rapidly, adjusting high-voltage discharge voltage power to enable the thickness of the edge material to be uniform, wherein the power variation range is 0-5kv, and adjusting an expansion screw on a die lip to reduce the extrusion of edge points and greatly reduce the thickness of the edge material, so that the method can greatly reduce the thickness of the edge material, further improve the input and output, and simultaneously solve the problem of thickness warping of the film roll;
seventhly, the extruded film passes through a main roller with the temperature of 70 ℃, is gradually cooled and shaped through a rubber roller and a steel roller, is subjected to corona treatment on the surface of the film at 1.6kw, and enters a winding unit;
and eighthly, after the membrane material enters the winding unit, using a cutter to perform trimming treatment, and finishing winding of the membrane material in the winding unit.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (2)
1. The method for casting the PVDF fluorine film by the high-voltage generator is characterized by comprising a high-voltage generator body (1), wherein two sides of the high-voltage generator body (1) are connected with an electrode bar (2) through electric conduction;
when the high-pressure generator is used for widening the cast PVDF fluorine film, raw materials are dried for 2 hours at the temperature of 70 ℃, sucked into an extruder, and the cast PVDF fluorine film is extruded at the die lip of a die head through high-temperature melting, plasticizing and homogenizing of a screw rod of the extruder at the temperature of 200 ℃, wherein the method comprises the following steps:
firstly, a high-voltage discharge device is placed on a platform of an extruder and positioned at a die lip, and two sides of the high-voltage discharge device are connected with electrode rods (2);
secondly, respectively placing 2 electrode rods (2) at the positions 2cm away from the surface of the PVDF fluorine film, wherein the electrode rods are respectively arranged at the left side and the right side of the die lip and are positioned at the positions 2cm away from the right lower opening of the die lip;
thirdly, starting a power supply of the high-voltage discharge device, wherein the power of the high-voltage discharge voltage is 30KV, so that the PVDF fluorine film is rapidly widened;
fourthly, adjusting an expansion screw on the die lip to change the outflow quantity of the PVDF fluorine film material at an electric shock point, so that the thickness of the PVDF fluorine film meets the normal thickness requirement;
fifthly, the extruded film passes through a main roller with the temperature of 70 ℃, is gradually cooled and shaped through a rubber roller and a steel roller, is subjected to corona treatment on the surface of the film at 1.6kw, and then enters a winding unit;
sixthly, after the membrane material enters the winding unit, using a cutter to carry out edge cutting treatment, and finishing winding the membrane material in the winding unit;
when the high-pressure generator is used for casting the PVDF fluorine film, the raw material is dried for 2 hours at the temperature of 70 ℃, sucked into the extruder, and the normal width of the cast PVDF fluorine film is extruded at the die lip of a die head through the high-temperature melting, plasticizing and homogenizing of a screw rod of the extruder at the temperature of 200 ℃, and the method comprises the following steps:
firstly, a high-voltage discharge device is placed on a platform of an extruder and positioned at a die lip, and two sides of the high-voltage discharge device are connected with electrode rods (2);
secondly, respectively placing 2 electrode rods at the width edge of the PVDF fluorine membrane, wherein the distance between the electrode rods and the surface of the PVDF fluorine membrane is 1-3cm;
thirdly, starting a power supply of a high-voltage discharge device, wherein the power of the high-voltage discharge voltage is 10KV, and treating the PVDF fluorine film in a semi-molten state;
fourthly, after the PVDF fluorine film edge processed in the third step becomes thin rapidly, adjusting the power of high-voltage discharge voltage to enable the thickness of the rim charge to be uniform, wherein the power variation range is 0-5kv;
fifthly, the extruded film passes through a main roller with the temperature of 70 ℃, is gradually cooled and shaped through a rubber roller and a steel roller, and enters a winding unit after the corona treatment of the surface of the film of 1.6 KW;
and sixthly, after the membrane material enters the winding unit, using a cutter to perform trimming treatment, and finishing winding the membrane material in the winding unit.
2. The method of high pressure generator for casting PVDF fluorine film as claimed in claim 1, wherein: when the high-pressure generator is used for thinning the cast PVDF fluorine film, the expansion screw on the die lip is adjusted in the fourth step of operation, so that the extrusion of edge points is reduced, and the thickness of the edge material is greatly reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010712181.6A CN111873281B (en) | 2020-07-22 | 2020-07-22 | High-voltage generator for width expanding and thinning of cast PVDF (polyvinylidene fluoride) fluorine film and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010712181.6A CN111873281B (en) | 2020-07-22 | 2020-07-22 | High-voltage generator for width expanding and thinning of cast PVDF (polyvinylidene fluoride) fluorine film and using method thereof |
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| Publication Number | Publication Date |
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| CN111873281A CN111873281A (en) | 2020-11-03 |
| CN111873281B true CN111873281B (en) | 2022-11-11 |
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| JPS5517559A (en) * | 1978-07-25 | 1980-02-07 | Toyobo Co Ltd | Method of cooling polyamide polymer sheet |
| JPS59106935A (en) * | 1982-12-13 | 1984-06-20 | Unitika Ltd | Preparation of polyester resin film |
| JP3678186B2 (en) * | 2001-08-01 | 2005-08-03 | 東洋紡績株式会社 | Heat-shrinkable polyester film roll |
| CN107030949B (en) * | 2016-12-30 | 2019-01-18 | 桂林电器科学研究院有限公司 | A kind of polyamic acid resin solution attaching lip wall extrusion salivation method based on electrostatic |
| CN207646190U (en) * | 2017-06-23 | 2018-07-24 | 广州迈普再生医学科技有限公司 | A kind of cell 3D printing system |
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