CN107984737B - Eccentric rolling device and method for polymer film surface periodic gradual change microstructure - Google Patents
Eccentric rolling device and method for polymer film surface periodic gradual change microstructure Download PDFInfo
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- CN107984737B CN107984737B CN201710941367.7A CN201710941367A CN107984737B CN 107984737 B CN107984737 B CN 107984737B CN 201710941367 A CN201710941367 A CN 201710941367A CN 107984737 B CN107984737 B CN 107984737B
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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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/002—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
- 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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/022—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor
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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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
- B29C59/046—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts for layered or coated substantially flat surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/022—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor
- B29C2059/023—Microembossing
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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
- B29L2007/002—Panels; Plates; Sheets
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Abstract
The invention relates to an eccentric rolling device and a method of a periodic gradual-change microstructure on the surface of a polymer film, wherein the eccentric rolling device comprises a rack, an eccentric rolling mechanism arranged on the rack, and an unwinding mechanism and a winding mechanism which are respectively arranged on two sides of the eccentric rolling mechanism; the processing method sequentially comprises unreeling, eccentric rolling and reeling. Compared with the prior art, the invention utilizes the eccentric mold roller to imprint the surface of the polymer film, obtains the secondary microstructure on the periodic primary profile formed by the eccentricity of the mold roller, is a periodic gradual change secondary composite structure, has flexible structural design, can realize the processing of different gradual change microstructures, and meets the requirement of continuous change of multiple functions in different application occasions.
Description
Technical Field
The invention belongs to the technical field of polymer films, and relates to an eccentric rolling device and method for a periodic gradual change microstructure on the surface of a polymer film.
Background
The polymer film products with surface micro-functional structures are widely applied in the fields of optical films, flexible electronics, thin film solar cells and the like. At present, microstructures commonly adopted on the surface of a polymer film comprise a micro-lens array, a micro-pyramid array, a micro-prism array and the like, and the microstructures only have single functions and cannot meet the requirements of multifunctional compounding. Compared with the traditional array microstructure, the periodic gradual change microstructure on the surface of the polymer film can provide more comprehensive and variable physical properties, and has unique application in the fields of optics, interface research and the like.
Researches show that the gradual-change type nano-projection array structure on the cornea and wing surfaces of compound eyes of some insects in nature has ideal broad-spectrum anti-reflection, super-hydrophobic self-cleaning and anti-fog properties. For example, U.S. Pat. No. 3,3989775 (patent name: Method of Making a reflection-corrected Material) discloses a surface microsphere structure with antireflection property, which is formed by attaching microspheres on the surface of a wavy substrate to form a periodically-graded multi-stage structure, and can effectively reduce reflection and improve the utilization rate of light. Chinese patent publication No. CN102856618A discloses a rainbow local area device with gradually changing planar groove depth, which is mainly characterized in that metal units are periodically arranged, the size and shape of the metal units are the same, and grooves perpendicular to the length direction are arranged on the metal units, and the depth of the grooves increases or decreases progressively. The periodic gradual change multi-stage structure has unique and superior performance and wide potential application range.
Currently, the processing methods for polymer film products generally include hot stamping and Ultraviolet (UV) curing molding processes. In recent years, roll-to-roll forming processes have been rapidly developed to meet the demand for mass production of large-area polymer film products. Chinese patent publication No. CN102700123A discloses a roll-to-roll rolling forming device for microstructure of polymer film products, and chinese patent publication No. CN104608370A discloses a system and a method for processing microstructure on surface of polymer film based on roll-to-roll UV curing, and these two forming processes can copy the mold structure on the surface of polymer continuously in batch. However, for the surface periodic gradient microstructure, the current design is limited to the one-level gradient structure, and cannot be used for processing the multi-level composite periodic gradient microstructure. Meanwhile, aiming at the batch production of the periodic gradual change microstructure, the traditional forming process needs to adopt a mold with a corresponding complex structure, and the processing characteristics of the periodic gradual change microstructure have the characteristics of small structure, dense arrangement and continuous change, so that the difficulty of mold processing is high, and the process is time-consuming.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an eccentric rolling device and method for a polymer film surface periodic gradual-change microstructure.
The purpose of the invention can be realized by the following technical scheme:
the device comprises a rack, an eccentric rolling mechanism arranged on the rack, and an unwinding mechanism and a winding mechanism which are respectively arranged on two sides of the eccentric rolling mechanism, wherein a polymer film material is arranged in the unwinding mechanism, one end of the polymer film material passes through the eccentric rolling mechanism and then is wound in the winding mechanism, and the eccentric rolling mechanism processes a periodic gradual-change microstructure on the surface of the polymer film material.
As an optimal technical scheme, the unwinding mechanism and the winding mechanism are both arranged on the rack.
Furthermore, the eccentric roller pressing mechanism comprises an eccentric roller assembly and a pressure roller which are arranged on the frame in parallel up and down and are respectively connected with the frame in a rotating way. The polymer film material is placed between a roller assembly and a pressure roller, and a periodic graded microstructure is machined on the surface of the polymer film material by the roller assembly.
Furthermore, the eccentric roller assembly comprises a turntable rotatably arranged on the frame, a guide rail radially arranged on the turntable along the turntable, a linear motor movably arranged on the guide rail and a mold roller fixedly connected with the linear motor. The linear motor can move on the guide rail to adjust the distance between the central shaft of the turntable and the central shaft of the mold roller, and further realize the adjustment of the eccentricity. The surface of the mould roller can be provided with a mould, and the surface of the mould has a fine structure, and the characteristic dimension of the fine structure is 1 mu m to 1 cm. The micro structure on the surface of the mold is an array structure with a certain depth-to-width ratio, and includes but is not limited to micro pyramid arrays, micro prism arrays, micro lens arrays, micro cylinder arrays, micro grating arrays and other micro structures.
Further, the eccentric roller assembly further comprises a turntable driving motor in transmission connection with the turntable. The turntable driving motor drives the turntable to rotate around the turntable central shaft, so that the mold roller eccentrically rotates.
Further, the eccentric roller assembly further comprises a pressure sensor. The contact pressure of the mold roll with the surface of the polymer film material was measured by a pressure sensor to adjust the eccentricity to a proper value.
Further, unwinding mechanism including unreeling the roller and with unreel the roller drive motor of unreeling that the roller transmission is connected, winding mechanism include the wind-up roll and with the wind-up roll drive motor of wind-up roll transmission connection. The unwinding roller driving motor drives the unwinding roller to rotate, and the winding roller driving motor drives the winding roller to rotate.
Furthermore, the device also comprises a glue dripping nozzle arranged between the unreeling mechanism and the eccentric rolling mechanism and an ultraviolet curing lamp arranged between the eccentric rolling mechanism and the reeling mechanism. The glue dripping nozzle is used for dripping a layer of ultraviolet curing glue on the surface of the polymer film material, the ultraviolet curing glue has good fluidity and can flow into a die cavity of the die roller under the action of pressure, so that the polymer film material forms a layer of periodic gradual-change microstructure and is then cured under the action of an ultraviolet curing lamp.
Further, the device also comprises a temperature gradient preheating roller set arranged between the unreeling mechanism and the eccentric rolling mechanism. The temperature gradient preheating roller group comprises a plurality of pairs of temperature gradient preheating rollers, the surface temperatures of the plurality of pairs of temperature gradient preheating rollers are sequentially increased, and the polymer film material is continuously heated.
A method of processing a polymer film using an eccentric roller device, the method comprising the steps of:
1) unreeling: putting the polymer film material into an unwinding mechanism, pulling out one end of the polymer film material, and pretreating the polymer film material;
2) eccentric rolling: adjusting the eccentricity through an eccentric rolling mechanism, and processing a periodic gradual change microstructure on the surface of the polymer film material through the eccentric rolling mechanism;
3) winding: and the processed polymer film material is rolled by a rolling mechanism.
In step 1), one end of the polymer film material is pulled out, so that the polymer film material is unfolded from a roll shape. The pretreatment comprises the steps of removing dust and static electricity on the surface of the polymer film material, and the like, and corresponding pretreatment processes are adopted aiming at different rolling processes.
In the step 2), the eccentric rolling mechanism is adjusted to enable the die roller to be in close contact with the surface of the polymer film material, the contact pressure is measured through the pressure sensor, and the eccentricity is adjusted to control the contact pressure to be in a proper interval. In roll pressing, the polymer film material is transferred between the mold roll and the pressure roll for imprinting, and the polymer film material fills the cavities on the surface of the mold roll by the pressure. Due to the eccentricity, the distance between the mold roller and the surface of the polymer film material is periodically changed in the imprinting process, and the filling rate of the mold cavity is also periodically changed, so that the processing of the periodic gradual-change microstructure is realized.
The mold roll approach point is the point on the mold roll surface closest to the center axis of the turntable.
In the step 3), after the polymer film material with the surface microstructure is separated from the mold roller, the polymer film material is contracted into a coiled material again through the traction of a winding roller, and the roll-to-roll rolling forming process is completed.
As a preferred technical scheme, the polymer film material is a thermoplastic polymer coiled material or a thermoplastic polymer sheet, and the thickness is 50-1000 μm.
As a preferable technical scheme, the diameter of the rotary table is 150mm, the length of the guide rail is 50mm, the linear motor can move on the guide rail, and the repeated positioning precision is +/-1 mu m. The mold roll is a circular roll having a fixed fine structure on the surface thereof, and a mold having a fine structure may be provided on the surface of the mold roll. The rotation of the turntable drives the mold roller to rotate around the central shaft of the turntable, the central shaft of the mold roller and the central shaft of the turntable do not coincide, the distance between the central shaft of the mold roller and the central shaft of the turntable is an eccentric distance, the eccentric distance can be adjusted in real time through a linear motor, and the range is adjustable within 0-1000 microns.
Further, the method also comprises a second eccentric rolling, and the process of the second eccentric rolling is as follows: and replacing a die in the eccentric rolling mechanism, placing the processed polymer film material in the unwinding mechanism, and carrying out eccentric rolling again. The secondary eccentric rolling can process an alternating structure or a superimposed structure on the polymer film material.
The working principle of the eccentric rolling device is as follows: in the roll-to-roll rolling forming process, the central shaft of the die roller is not overlapped with the central shaft of the turntable, so that the die roller rotates around the axis of the turntable by a certain eccentric distance to realize the forming of a periodic gradual change structure. At this time, the distance between the surface of the mold roll and the surface of the polymer film material, the roll pressure applied to the polymer film material, and the like are periodically changed. The eccentric distance of the die roller is precisely adjustable within a certain range by arranging the guide rail and the linear motor. By adopting the method, even if a simple die with the same surface microstructure is adopted, the eccentric rolling device can realize large-area preparation of the periodic gradual-change microstructure, and the method is a simple and efficient advanced embossing forming method.
The microstructure processed on the surface of the polymer film material is a secondary composite structure with periodically gradual change, a primary wave-shaped structure can be processed on the surface of the polymer film material due to the eccentric rotation of the die roller, and the secondary structure is compounded on the primary wave-shaped structure, and has two-dimensional continuous gradual change characteristics, including continuous gradual change of the geometric shape in the length direction of the polymer film material and continuous gradual change of the structure height in the depth direction of the polymer film material. The primary structure profile is a continuous periodic function, the secondary structure is a geometric feature which is uniformly distributed in the length direction in a span mode and is periodically and continuously increased or decreased in the depth direction, and the outer envelope of the secondary structure is a primary structure. The geometrical characteristics of the secondary structure are that the cross-sectional dimension is not strictly monotonously decreased from the surface to the inside of the film, and include, but are not limited to, prisms, cylinders, cones and composite structures formed by overlapping the prisms, the cylinders, the cones and the composite structures.
Compared with the prior art, the invention has the following characteristics:
1) the eccentric design is adopted, the eccentric mold roller is utilized to imprint the surface of the polymer film, and a secondary microstructure is obtained on a periodic primary profile formed by the eccentricity of the mold roller, so that the mold roller is a periodic gradual-change secondary composite structure, the structural design is flexible, the processing of different gradual-change microstructures can be realized, and the requirement of continuous change of multiple functions in different application occasions is met;
2) due to the eccentric design of the die roller, the periodic gradual-change microstructure can be obtained by adopting a die with a simple structure in the eccentric rolling process, and the die with a complex structure does not need to be processed, so that the processing cost is effectively reduced, the process method is simplified, and the high-precision batch production of the periodic gradual-change microstructure on the surface of the polymer film can be realized;
3) the eccentric rolling is a continuous processing process, and the surface of the die roller is also continuous, so that the finally processed microstructure is also continuously and gradually changed, and the problems of sudden change and step change of the microstructure can be effectively overcome.
Drawings
FIG. 1 is a schematic cross-sectional structure diagram of a periodic graded microstructure on a surface of a polymer film;
FIG. 2 is a schematic view showing the structure of an eccentric rolling device in example 1;
FIG. 3 is a schematic view showing the structure of an eccentric rolling device in example 2;
the notation in the figure is:
the device comprises a micro-grating gradient array 1, a micro-lens gradient array 2, a micro-pyramid gradient array 3, a wave-shaped primary profile 4, a discontinuous micro-grating array 5, a discontinuous micro-lens array 6, an alternating structure 7, a superposition structure 8, an unwinding roller 9, a polymer film material 10, a glue dripping nozzle 11, a light-cured glue film 12, a rotary table 13, a guide rail 14, a linear motor 15, an ultraviolet curing lamp 16, a pressure roller 17, a rack 18, a periodic gradient microstructure 19, a winding roller 20, a mold roller 21 and a temperature gradient preheating roller set 22.
Detailed Description
The periodic graded microstructure 19 has a periodic and continuous grading characteristic in the depth direction, including but not limited to the several structures shown in fig. 1. The micro-grating gradual change array 1, the micro-lens gradual change array 2, the micro-pyramid gradual change array 3, the alternating structure 7 and the periodic array in the depth direction of the superposition structure 8 enable the microstructure to present a multi-stage composite state. The wavy primary contour 4 shown in fig. 1 is a primary structure, and the micro-grating gradual change array 1, the micro-lens gradual change array 2, the micro-pyramid gradual change array 3, the alternating structure 7 and the superposition structure 8 are secondary structures.
The geometry of the periodic graded microstructure 19 varies periodically in the length direction. As shown in fig. 1, the discontinuous micro-grating array 5 and the discontinuous micro-lens array 6 are overlapped in a staggered manner, so that an alternating structure 7 with periodically changed geometric shapes in the length direction is obtained; the discontinuous micro-grating array 5 and the discontinuous micro-lens array 6 are superposed in an apposition manner, so that a superposed structure 8 can be obtained.
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1:
in this embodiment, for the micro-grating gradient array 1 shown in fig. 1, a layer of ultraviolet curing adhesive is dropped on the polymer film material 10 through the adhesive dropping nozzle 11, and the periodic gradient microstructure 19 is processed on the surface of the polymer film material 10 by a roll-to-roll eccentric roll forming method. The eccentric rolling device is shown in fig. 2. The surface of the mold roller 21 is of a micro-grating array structure, and the depths of the mold cavities are the same. The components of the ultraviolet light curing adhesive comprise a monomer, a photoinitiator, an auxiliary agent and a prepolymer, wherein the prepolymer is mainly a resin compound, and generates active free radicals or cations under the irradiation of UV light to initiate the polymerization and crosslinking chemical reaction of the monomer, so that the adhesive is converted from a liquid state to a solid state within several seconds.
Before the imprinting premise, the ultraviolet curing lamp 16 is turned on to preheat the ultraviolet curing lamp 16, and the ultraviolet curing lamp 16 is enabled to work normally after 5 minutes. And meanwhile, the air source is started to play an air cooling role and prevent the ultraviolet curing lamp 16 from being overhigh in temperature.
The specific processing method comprises the following steps:
1) unreeling: taking a polyethylene terephthalate (PET) base material with the thickness of 150 mu m as a polymer film material 10, discharging the base material from an unwinding roller 9, removing static electricity on the surface of the base material, and waiting for a certain time to ensure that the unwinding speed of the polymer film material 10 is uniform;
2) and (3) glue dripping: after the unreeling speed of the polymer film material 10 is uniform, starting a glue dripping device, adjusting the glue dripping speed of a glue dripping nozzle 11 according to the rolling speed, ensuring that ultraviolet curing glue is uniformly and continuously distributed on the polymer film material 10 and the side surface of the ultraviolet curing glue does not exceed a base material, and impressing the ultraviolet curing glue in an eccentric rolling mechanism after the ultraviolet curing glue forms a light curing glue film 12 on the polymer film material 10;
3) eccentric rolling: the polymer film material 10 enters an eccentric rolling mechanism, a light-cured glue film 12 is arranged between a mould roller 21 and a pressure roller 17, the contact pressure value of the mould roller 21 and the material at the near place measured by a pressure sensor is observed, and the eccentricity is adjusted to 50 mu m by the drive of a linear motor 15. The UV-curable adhesive is in a liquid state, has good fluidity, can flow into the die cavity under the action of pressure, and then is filled into the die cavity under the action of the pressure roller 17. Due to the eccentricity, the distance between the mold roller 21 and the polymer film material 10 is periodically changed in the imprinting process, and the filling rate of the mold cavity is also periodically changed, so that the processing of the periodic gradual-change microstructure is realized. Meanwhile, the eccentricity can be changed by adjusting the position of the linear motor 15, and the periodic gradual-change microstructure 19 can be regulated and controlled in real time;
4) winding: after the ultraviolet curing adhesive is cured by illumination of an ultraviolet curing lamp 16, a periodic gradual-change microstructure 19 is formed on the polymer film material 10, the periodic gradual-change microstructure 19 is adhered to the polymer film material 10 to form a polymer film product, and demolding and winding are completed under the traction of a winding roller 20.
Similarly, by using a micro pyramid array mold or a micro lens array mold, a micro lens gradient array 2 and a micro pyramid gradient array 3 shown in fig. 1 can be obtained.
Example 2:
in this embodiment, for the alternating structure 7 and the stacked structure 8 shown in fig. 1, the polymer film material 10 is a thermoplastic polymer polymethyl methacrylate (PMMA), and the periodic graded microstructure 19 is processed by a two-time eccentric roll forming method using a roll-to-roll eccentric hot rolling device.
The apparatus is shown in fig. 3, in which the unwinding roller 9, the temperature gradient preheating roller group 22 and the die roller 21 are driven by respective motors, and together serve as a driving roller in roll-to-roll transfer, and the rotation of the pressure roller 17 is driven by the movement of the die roller 21 and the polymer film material 10 together. The hydraulic cylinder connected to the temperature gradient preheating roller group 22 may push the temperature gradient preheating roller group 22 toward the polymer film material 10, the three pairs of preheating rollers may perform preheating at gradually increasing temperatures, and the hydraulic cylinder connected to the pressure roller 17 may push the pressure roller 17 toward the mold roller 21.
Before the start of rolling, the surface of the temperature gradient preheating roller set 22 is heated to a temperature higher than the glass transition temperature of PMMA. In this example, the glass transition temperature of PMMA was 110 ℃ and the viscous flow temperature was 220 ℃. The surface of the mold roll 21 was heated to a temperature near the viscous flow temperature of PMMA, which was 220 ℃ in this example.
The specific processing method comprises the following steps:
1) unreeling and preheating: taking a PMMA film with the thickness of 200 mu m as a polymer film material 10, and transferring the PMMA film from an unwinding roller 9 to a temperature gradient preheating roller group 22, wherein the preheating temperatures of three pairs of preheating rollers in the temperature gradient preheating roller group 22 are respectively set to be 90 ℃, 120 ℃ and 150 ℃, the polymer film material 10 is heated to the attaching temperature of about 150 ℃ under pressure by the three pairs of preheating rollers, and at the moment, the polymer film material 10 is in a high-elastic state, and the material is softened;
2) primary eccentric rolling: the PMMA is in a viscous state at 150 ℃, has certain fluidity and can better fill a die cavity. The micro-structure array is regulated and controlled in real time by increasing the eccentricity, so that a discontinuous array structure is formed. Taking the prism array mold as an example, the prism height is 100 μm, the length and width are 20 μm, and the interval between adjacent prisms is 30 μm, and the sheet-like prism array mold is stuck to the surface of the mold roll 21. When the eccentricity is adjusted to be larger than 50 micrometers, the distance between the surface of the mold roller 21 and the polymer film material 10 is too large to contact with each other in a part of time in the imprinting process, so that a discontinuous periodic structure is formed;
3) demolding: after the polymer film material 10 is delivered out from between the mold roller 21 and the pressure roller 17, the polymer film material is naturally cooled, the temperature is rapidly reduced to be lower than the glass transition temperature, the material is solidified and separated from the mold roller 21 after being subjected to the traction force of the winding roller 20, and the periodic gradual-change microstructure 19 is formed on the polymer film material 10, so that the demolding process is completed;
4) winding: after demolding is finished, the polymer film material 10 is continuously cooled to realize solidification forming of the polymer film material 10, and finally, winding is carried out through a winding roller 20 to finish the roll-to-roll hot-roll stamping forming process;
5) secondary eccentric rolling: and (3) replacing the mold on the surface of the mold roller 21, putting the polymer film material 10 with the periodic gradual-change microstructure 19 on the surface into the unwinding roller 9 again, ensuring that the surface with the periodic gradual-change microstructure 19 is opposite to the mold roller 21, carrying out secondary imprinting by using the whole device, realizing the superposition or alternation of the two microstructures through precise positioning and precise adjustment of eccentricity, and further processing the alternative structure 7 or the superposed structure 8 shown in the figure 1.
Wherein, in the step 1), the bonding temperature range is from 10 ℃ below the glass transition temperature of the polymer film material 10 to 10 ℃ below the viscous flow temperature. In step 2), the imprinting temperature ranges from 40 ℃ below the viscous flow temperature of the polymer film material 10 to 50 ℃ above the viscous flow temperature.
Example 3:
the eccentric rolling device of the periodic gradual change microstructure on the surface of the polymer film comprises a rack 18, an eccentric rolling mechanism arranged on the rack 18, and an unwinding mechanism and a winding mechanism which are respectively arranged on two sides of the eccentric rolling mechanism, wherein a polymer film material 10 is arranged in the unwinding mechanism, one end of the polymer film material 10 penetrates through the eccentric rolling mechanism and then is wound in the winding mechanism, and a periodic gradual change microstructure 19 is processed on the surface of the polymer film material 10 by the eccentric rolling mechanism.
Wherein, the eccentric rolling mechanism comprises an eccentric roller component and a pressure roller 17 which are arranged on the frame 18 in parallel and are respectively connected with the frame 18 in a rotating way. The eccentric roller assembly comprises a rotary table 13 rotatably arranged on a frame 18, a guide rail 14 arranged on the rotary table 13 along the radial direction of the rotary table 13, a linear motor 15 movably arranged on the guide rail 14 and a mold roller 21 fixedly connected with the linear motor 15. The eccentric roller assembly further comprises a turntable drive motor drivingly connected to turntable 13. The eccentric roller assembly further includes a pressure sensor.
Unwinding mechanism includes unreeling roller 9 and the driving motor of unreeling roller of being connected with unreeling roller 9 transmission, and winding mechanism includes wind-up roll 20 and the wind-up roll driving motor of being connected with wind-up roll 20 transmission.
As shown in fig. 2, the apparatus further includes a glue dripping nozzle 11 disposed between the unwinding mechanism and the eccentric rolling mechanism, and an ultraviolet curing lamp 16 disposed between the eccentric rolling mechanism and the winding mechanism.
The method for processing the polymer film by adopting the eccentric rolling device comprises the following steps:
1) unreeling: placing the polymer film material 10 in an unwinding mechanism, pulling out one end of the polymer film material 10, and pretreating the polymer film material 10;
2) eccentric rolling: adjusting the eccentricity through an eccentric rolling mechanism, and processing a periodic gradual change microstructure 19 on the surface of the polymer film material 10 through the eccentric rolling mechanism;
3) winding: the processed polymer film material 10 is wound by a winding mechanism.
Example 4:
the eccentric rolling device of the periodic gradual change microstructure on the surface of the polymer film comprises a rack 18, an eccentric rolling mechanism arranged on the rack 18, and an unwinding mechanism and a winding mechanism which are respectively arranged on two sides of the eccentric rolling mechanism, wherein a polymer film material 10 is arranged in the unwinding mechanism, one end of the polymer film material 10 penetrates through the eccentric rolling mechanism and then is wound in the winding mechanism, and a periodic gradual change microstructure 19 is processed on the surface of the polymer film material 10 by the eccentric rolling mechanism.
Wherein, the eccentric rolling mechanism comprises an eccentric roller component and a pressure roller 17 which are arranged on the frame 18 in parallel and are respectively connected with the frame 18 in a rotating way. The eccentric roller assembly comprises a rotary table 13 rotatably arranged on a frame 18, a guide rail 14 arranged on the rotary table 13 along the radial direction of the rotary table 13, a linear motor 15 movably arranged on the guide rail 14 and a mold roller 21 fixedly connected with the linear motor 15. The eccentric roller assembly further comprises a turntable drive motor drivingly connected to turntable 13. The eccentric roller assembly further includes a pressure sensor.
Unwinding mechanism includes unreeling roller 9 and the driving motor of unreeling roller of being connected with unreeling roller 9 transmission, and winding mechanism includes wind-up roll 20 and the wind-up roll driving motor of being connected with wind-up roll 20 transmission.
As shown in fig. 3, the apparatus further includes a temperature gradient preheating roller set 22 disposed between the unwinding mechanism and the eccentric rolling mechanism.
The method for processing the polymer film by adopting the eccentric rolling device comprises the following steps:
1) unreeling: placing the polymer film material 10 in an unwinding mechanism, pulling out one end of the polymer film material 10, and pretreating the polymer film material 10;
2) eccentric rolling: adjusting the eccentricity through an eccentric rolling mechanism, and processing a periodic gradual change microstructure 19 on the surface of the polymer film material 10 through the eccentric rolling mechanism;
3) winding: the processed polymer film material 10 is wound by a winding mechanism.
4) Secondary eccentric rolling: and (3) replacing a die in the eccentric rolling mechanism, placing the processed polymer film material 10 in the unwinding mechanism, and carrying out eccentric rolling again.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (8)
1. The eccentric rolling device of the periodic gradual change microstructure on the surface of the polymer film is characterized by comprising a rack (18), an eccentric rolling mechanism arranged on the rack (18), an unreeling mechanism and a reeling mechanism which are respectively arranged on two sides of the eccentric rolling mechanism, wherein the polymer film material (10) is placed in the unreeling mechanism, one end of the polymer film material (10) passes through the eccentric rolling mechanism and then is wound in the reeling mechanism, and the periodic gradual change microstructure (19) is processed on the surface of the polymer film material (10) by the eccentric rolling mechanism;
the eccentric roller pressing mechanism comprises an eccentric roller assembly and a pressure roller (17) which are arranged on the frame (18) in parallel up and down and are respectively and rotatably connected with the frame (18);
the eccentric roller assembly comprises a rotary disc (13) rotatably arranged on a frame (18), a guide rail (14) arranged on the rotary disc (13) along the radial direction of the rotary disc (13), a linear motor (15) movably arranged on the guide rail (14) and a die roller (21) fixedly connected with the linear motor (15).
2. The eccentric rolling device of polymer film surface periodic gradual microstructure according to claim 1, wherein the eccentric rolling device further comprises a turntable driving motor in transmission connection with the turntable (13).
3. The eccentric rolling device of polymer film surface periodic gradient microstructure according to claim 1, wherein the eccentric roller assembly further comprises a pressure sensor.
4. The eccentric rolling device of the periodic gradual microstructure on the surface of the polymer film as claimed in claim 1, wherein the unwinding mechanism comprises an unwinding roller (9) and an unwinding roller driving motor in transmission connection with the unwinding roller (9), and the winding mechanism comprises a winding roller (20) and a winding roller driving motor in transmission connection with the winding roller (20).
5. The eccentric rolling device of the periodic gradual microstructure on the surface of the polymer film as claimed in claim 1, further comprising a glue dripping nozzle (11) disposed between the unwinding mechanism and the eccentric rolling mechanism and an ultraviolet curing lamp (16) disposed between the eccentric rolling mechanism and the winding mechanism.
6. The eccentric rolling device with the periodically gradually changed microstructure on the surface of the polymer film as claimed in claim 1, further comprising a temperature-gradually changing preheating roller set (22) arranged between the unreeling mechanism and the eccentric rolling mechanism.
7. A method of processing a polymer film using the eccentric rolling device according to any of claims 1 to 6, comprising the steps of:
1) unreeling: putting the polymer film material (10) into an unwinding mechanism, pulling out one end of the polymer film material (10), and pretreating the polymer film material (10);
2) eccentric rolling: adjusting the eccentricity through an eccentric rolling mechanism, and processing a periodic gradual change microstructure (19) on the surface of the polymer film material (10) through the eccentric rolling mechanism;
3) winding: and the processed polymer film material (10) is wound by a winding mechanism.
8. The method of processing a polymer film using an eccentric rolling device according to claim 7, further comprising a second eccentric rolling process of: and (3) replacing a die in the eccentric rolling mechanism, placing the processed polymer film material (10) in the unwinding mechanism, and carrying out eccentric rolling again.
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| CN111252454A (en) * | 2019-10-10 | 2020-06-09 | 东南大学 | Micro-texture conveyor belt and preparation method thereof |
| CN112428573B (en) * | 2020-10-30 | 2023-03-10 | 江苏理工学院 | Rolling device for realizing various super-hydrophobic surface microstructure appearances and application method thereof |
| CN112644194B (en) * | 2020-12-25 | 2022-09-13 | 浙江亚欣包装材料有限公司 | Thin film plate making process |
| CN115008892B (en) * | 2022-06-27 | 2023-05-26 | 安徽科技学院 | Full-automatic printing device |
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