Flexible film imprinting method

Abstract

The invention discloses a flexible film imprinting method, which belongs to the technical field of imprinting methods, and comprises the following steps: (1) unreeling a to-be-processed flexible film, feeding and caching the flexible film, and coating a first surface of the flexible film with UV glue; and (2) pre-curing the UV glue coated on the first surface of the flexible film by using a pre-curing piece. And (3) embossing the two surfaces of the flexible film by adopting the first embossing piece and the second embossing piece. And (4) curing the flexible film by using a curing piece. And (5) curing the flexible film again by using a strong curing piece. And (6) the flexible thin film is cooled, then blanking buffering is conducted, and finally rolling is conducted. According to the flexible film impressing method, the flexible film is impressed through the two impressing pieces at the same time so that double-face impressing of the flexible film can be achieved, it can be guaranteed that the two impressing pieces work synchronously by adjusting the running speed and position of the impressing pieces, and it is guaranteed that the impressing effect is good.

Description

Technical Field

[0001] The invention belongs to the technical field of embossing methods, and in particular relates to a flexible film embossing method. Background Art

[0002] Optical anti-counterfeiting technology is a technology that uses optical principles and technical means to protect products from being counterfeited or tampered with. Its application in various fields is gradually expanding. In the field of currency, optical anti-counterfeiting technology is widely used in the anti-counterfeiting of banknotes and coins. For example, the use of high-resolution optical imaging technology can produce banknotes with tiny text and details, thereby increasing the difficulty of counterfeiting. In the field of commodities, optical anti-counterfeiting technology can be applied to the anti-counterfeiting of medicines, luxury goods and electronic products. By adding logos or labels with specific optical effects, consumers can judge the authenticity of products through simple optical detection methods. The current optical anti-counterfeiting manufacturing process can only achieve single-sided manufacturing, or double-sided asynchronous manufacturing. It is difficult to ensure the alignment accuracy of the double-sided pattern, which affects the anti-counterfeiting effect.

[0003] Nanoimprint technology is a technology that transfers the micro-nano structure on the template to the material to be processed with the aid of photoresist. This technology achieves extremely high resolution through mechanical transfer and has gradually become an important processing method in the field of microelectronics and materials.

[0004] However, the current nanoimprint technology can only achieve single-sided imprinting, or when achieving double-sided imprinting, the micro-nano structures formed on both sides of the material to be processed cannot be well "aligned", affecting the effect of double-sided imprinting. Traditional grating processing technologies mainly include mechanical scribing, holographic interference exposure and other methods to process the surface of the grating, but nanoimprinting technology cannot be used to imprint the two surfaces of the diffraction grating. Summary of the invention

[0005] In view of one or more of the above defects or improvement requirements of the prior art, the present invention provides a flexible film imprinting method, which can simultaneously imprint two surfaces of a diffraction grating by nanoimprinting technology.

[0006] To achieve the above object, the present invention provides a flexible film imprinting method, comprising the following steps:

[0007] (1) unwinding the flexible film to be processed, loading and caching the unwound flexible film, coating the first surface of the flexible film with UV glue, and coating the surface of the first stamping piece with UV glue;

[0008] (2) pre-curing the UV glue coated on the first surface of the flexible film using a pre-curing member;

[0009] (3) using a first stamping member to stamp the second surface of the flexible film, and using a second stamping member to stamp the first surface of the flexible film, wherein the first stamping member is printed with a first pattern, and the second stamping member is printed with a second pattern; providing a deviation-correcting member connected to the second stamping member, wherein the deviation-correcting member can adjust the position of the second stamping member, and controlling the deviation-correcting member to adjust the position of the second stamping member and control the running speed of the second stamping member so that the first stamping member and the second stamping member are stamped synchronously;

[0010] (4) curing the micro pattern embossed on the flexible film using a curing member, and then demolding;

[0011] (5) using a strong curing member to re-cur the demolded flexible film;

[0012] (6) The flexible film is cooled, then unloaded and buffered, and finally rolled up.

[0013] As a further improvement of the present invention, during the stamping process of (3), a positioning camera is used to capture the position deviation between the marking points on the first stamping part and the second stamping part, and the deviation value is transmitted to the correction part, which adjusts the position of the second stamping part.

[0014] As a further improvement of the present invention, in (1), between the unwinding and loading of the flexible film to be processed, if a roll of flexible film is used up, the material is replaced and the film is pressed by a cylinder, and the previous roll of film and the next roll of film can be connected together during the material replacement process.

[0015] As a further improvement of the present invention, in (6), if a roll of flexible film is used up between material unloading and rewinding, the material is replaced and the film is pressed by using a cylinder to press the flexible film, and the previous roll of film and the next roll of film can be connected together during the material replacement process.

[0016] As a further improvement of the present invention, in (1), a hand expansion shaft is used in conjunction with a magnetic powder clutch during unwinding to provide unwinding tension control, and a first sensor is set to monitor the number of rotations during unwinding. By setting the roll diameter, film thickness, magnetic powder force and combining the first sensor to monitor the number of rotations to perform PID control, the tension of the flexible film is kept constant during continuous operation.

[0017] As a further improvement of the present invention, in (6), a hand expansion shaft is used in conjunction with a magnetic powder clutch during winding to provide material tension control, and a second sensor is set to monitor the number of rotations during winding. By setting the winding diameter, film thickness, magnetic powder force and combining the second sensor to monitor the number of rotations to perform PID control, the tension of the flexible film is kept constant during continuous operation.

[0018] As a further improvement of the present invention, in (1), the weight of the counterweight wheel is used in combination with the weight addition and subtraction to control the tension of the flexible film during material loading and caching.

[0019] As a further improvement of the present invention, in (6), the weight of the counterweight wheel is used in combination with the weight addition and subtraction to control the tension of the flexible film during material unloading and buffering.

[0020] As a further improvement of the present invention, in (1), the process of applying UV glue to the first surface of the flexible film is as follows:

[0021] The automatic glue dripping device is used to drip the UV glue onto the first side of the flexible film, and the scraper and the anilox roller are used together to evenly coat the UV glue onto the first side of the flexible film.

[0022] As a further improvement of the present invention, in (1), the process of applying UV glue to the first stamped piece is:

[0023] The UV glue is dripped onto the surface of the first stamping part by using an automatic glue dripping device, and the UV glue is evenly coated onto the surface of the first stamping part by using a scraper and an anilox roller.

[0024] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0025] In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

[0026] (1) The flexible film imprinting method of the present invention can imprint the flexible film by performing the processes of material discharge, material pressing, glue dripping and imprinting. At the same time, the flexible film can be imprinted on both sides by using two imprinting parts. The running speed and position of the imprinting parts can be adjusted to ensure that the two imprinting parts work synchronously, thereby ensuring a good imprinting effect.

[0027] (2) The flexible film embossing method of the present invention controls the loading and unloading of materials to ensure that the flexible film is stable and does not deform, so that the subsequent processes are stable and the finished product has a good effect. Multi-step curing facilitates the complete plasticity of the embossed pattern, and the embossing effect is stable and good, which has a good application prospect.

[0028] (3) The flexible film embossing method of the present invention performs various steps on the flexible film to be processed during feeding to ensure stable and reliable feeding, and controls the tension of the flexible film to ensure that it can be well processed in the subsequent process. At the same time, the embossing parts are adjusted during the embossing process to ensure that the two embossing parts are synchronized during double-sided embossing, the embossed pattern meets the requirements, and the finished product is good. The flexible film is also controlled during unloading to ensure stability during winding. Finally, the overall effect is good, and it has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a schematic flow chart of a flexible film imprinting method according to an embodiment of the present invention;

[0031] Figure 2 1 is a simple schematic diagram of the process of the flexible film imprinting method in an embodiment of the present invention;

[0032] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0033] 1. Unwinding component; 2. Film pressing component; 3. Buffer component; 4. First glue dripping component; 5. Second glue dripping component; 6. Pre-curing component; 7. First stamping component; 8. Second stamping component; 9. Correction component; 10. Curing component; 11. Positioning camera; 12. Strong curing component; 13. Cooling component; 14. Rewinding component. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] Example:

[0040] See also Figure 1-2 ,like Figure 1 As shown, the flexible film imprinting method in the preferred embodiment of the present invention comprises the following steps:

[0041] (1) First, the unwinding member 1 is used to unwind the flexible film to be processed. The flexible film can be a PET film in an optional embodiment. In the specific implementation, a hand expansion shaft can be selected, and its rotation is used to realize the unwinding. In the preferred embodiment, the hand expansion shaft is used in conjunction with the magnetic powder clutch during unwinding to provide unwinding tension control, and a first sensor is set to monitor the number of rotations of the unwinding member 1 during unwinding. By setting the roll diameter, film thickness, magnetic powder force and combining the first sensor to monitor the number of rotations to perform PID control, it is ensured that the tension of the flexible film is always kept constant during continuous operation, which can make the subsequent imprinting process have a better imprinting effect.

[0042] like Figure 2As shown, since the flexible film is arranged in rolls, if one roll is unwound, the material can be changed and film pressed after unwinding, and the flexible film will continuously move along the production direction during the whole process, so the film pressing member 2 is arranged after the unwinding member 1, and the unwound flexible film can be changed and film pressed. In the specific implementation, the film pressing member 2 can select a cylinder and a pressure roller, and the cylinder is used to press the flexible film, and the previous roll of film and the next roll of film can be connected together during the material change process, and the two are tightly connected.

[0043] Furthermore, in the preferred embodiment, after the material is changed and the film is pressed, a material buffer is also required, which can be implemented by a buffer member 3. In the specific implementation, a buffer roller is used, and the flexible film passes through the bottom of the buffer roller. The tension of the flexible film is controlled by the deadweight of the counterweight wheel and the addition and subtraction of weights, so that the subsequent process can proceed well.

[0044] Then, UV glue is applied to the first surface of the flexible film, and UV glue is applied to the surface of the first stamping member 7. In specific implementation, the first glue drop component 4 is used to apply UV glue to the first surface of the flexible film. It can be understood that the first surface is the front surface of the first glue drop component 4, which faces the first glue drop component 4. The glue drop component in the first glue drop component 4 can drop glue on the first surface of the flexible film due to gravity.

[0045] In the specific implementation, the first glue dripping assembly 4 may include an automatic glue dripping component, a scraper and an anilox roller. In the preferred embodiment, the process of applying UV glue to the first surface of the flexible film is as follows: using the automatic glue dripping component to drip UV glue onto the first surface of the flexible film, and using the scraper and the anilox roller to evenly apply the UV glue to the first surface of the flexible film.

[0046] In a preferred embodiment, the second side of the flexible film is the back side of the flexible film. Since it is not convenient to drip glue and apply glue on the back side, the glue application can be performed on the first stamping part 7 that is subsequently stamped on the second side of the flexible film. In this way, the UV glue can be applied to the second side of the flexible film through the first stamping part 7 during the subsequent stamping process.

[0047] Therefore, similarly, in the specific implementation, the second glue dripping assembly 5 can be used to coat the first stamping member 7, and the second glue dripping assembly 5 can also include an automatic glue dripping member, a scraper and an anilox roller. In the preferred embodiment, the process of coating the first stamping member 7 with UV glue is as follows:

[0048] The UV glue is dripped onto the surface of the first stamping member 7 by using an automatic glue dripping device, and the UV glue is evenly coated onto the surface of the first stamping member 7 by using a scraper and an anilox roller.

[0049] (2) Pre-curing the UV glue coated on the first surface of the flexible film using the pre-curing component 6. In specific implementation, the pre-curing component 6 uses a UV lamp to pre-curing the UV glue coated on the upper surface of the flexible film during operation.

[0050] (3) The first stamping member 7 is used to stamp the second surface of the flexible film, and the second stamping member 8 is used to stamp the first surface of the flexible film, wherein the first stamping member 7 is printed with a first pattern, and the second stamping member 8 is printed with a second pattern. It can be understood that the first pattern printed on the first stamping member 7 is stamped on the second surface of the flexible film, that is, the back surface of the flexible film. The second pattern printed on the second stamping member 8 is printed on the first surface of the flexible film, that is, the front surface of the flexible film, so that the first stamping member 7 and the second stamping member 8 can stamp both surfaces of the flexible film.

[0051] To ensure a good embossing effect, the patterns embossed on the front and back sides of the flexible film correspond, and a correction component 9 is provided to be connected to the second embossing component 8. The correction component 9 can adjust the position of the second embossing component 8, and the correction component 9 is controlled to adjust the position of the second embossing component 8 and control the running speed of the second embossing component 8 so that the first embossing component 8 and the second embossing component 8 can be embossed synchronously.

[0052] In the specific implementation, a positioning camera 11 is also used in the preferred embodiment. Two positioning cameras 11 can be provided to photograph the position deviation between the marking points on the first stamping part 7 and the second stamping part 8, and transmit the deviation value to the deviation correction part 9, which adjusts the position of the second stamping part 8. It can be understood that the positioning camera 11 is a visual positioning camera, and some marking points can be set on the first stamping part 7 and the second stamping part 8 accordingly before the stamping starts, so that during the operation, it can be confirmed by the marking points whether the stamping between the first stamping part 7 and the second stamping part 8 is synchronized.

[0053] On this basis, if the positioning camera 11 finds that the marking points set on the first stamping part 7 and the second stamping part 8 do not correspond at this time, the deviation can be transmitted to the correction part 9 so that the correction part 9 adjusts the second stamping part 8. In the actual operation process, the first stamping part 7 is used as a reference. If there is a deviation between the first stamping part 7 and the second stamping part 8, the position of the second stamping part 8 is adjusted.

[0054] In specific implementation, the first stamping member 7 can be a steel belt, the second stamping member 8 can be a quartz roller, and the deviation correction member 9 can be a UVW platform, which can be compensated and adjusted in the X / Y / angle direction according to the visual positioning deviation. At the same time, the deviation value captured by the positioning camera 11 can also be adjusted by adjusting the rotation speed of the second stamping member 8 to ensure that the running speeds of the first stamping member 7 and the second stamping member 8 correspond to each other, and the pattern is stamped as expected.

[0055] (4) Use the curing element 6 to cure the micro pattern embossed on the flexible film, and then demold. Similarly, the curing element 6 can use a UV lamp to perform ultraviolet curing.

[0056] (5) Use the strong curing member 6 to re-cur the demolded flexible film. Similarly, the strong curing member 6 can also use a UV lamp to re-cur the demolded flexible film to facilitate the complete shaping of the embossed pattern.

[0057] (6) Cooling the flexible film. In a preferred embodiment, a cooling element 13 can be used for cooling. In a specific implementation, an air knife can be used to ensure the stability of the embossing effect.

[0058] After that, the material is changed and the film is pressed in the same way, and the film pressing member 2 is also used, and a cylinder can be used to cooperate with a pressing roller. In the preferred embodiment, a cylinder is used to press the flexible film, and the previous roll of film and the next roll of film can be connected together during the material change process to ensure a tight connection.

[0059] After the material is changed and the film is pressed, the material is also cached. The cache member 3 can also be used. In the specific implementation, a cache roller is used. The flexible film passes through the bottom of the cache roller, and the tension of the flexible film is controlled by the weight of the counterweight wheel and the addition and subtraction of weights, so that the subsequent process can proceed well.

[0060] Finally, the film is wound up. In a preferred embodiment, a winding member 14 is used for winding up, and a hand-expanding shaft can also be used in the specific implementation. The winding member 14 is connected to a motor, which drives the winding member 14 to rotate, thereby driving the flexible film to move, thereby driving the unwinding member 1 to unwind, and realizing the operation of the flexible film. In a preferred embodiment, a hand-expanding shaft is used in conjunction with a magnetic powder clutch during winding up to provide material tension control, and a second sensor is set to monitor the number of rotations during winding up. By setting the winding diameter, film thickness, magnetic powder force and combining the second sensor to monitor the number of rotations for PID control, the tension is kept constant during continuous operation, so that the finished flexible film after winding up can have a good effect.

[0061] The flexible film embossing method of the present invention performs various steps on the flexible film to be processed during feeding to ensure stable and reliable feeding, and controls the tension of the flexible film to ensure that it can be well processed in the subsequent process. At the same time, the embossing parts are adjusted during the embossing process to ensure that the two embossing parts are synchronized during double-sided embossing, the embossed pattern meets the requirements, and the finished product is good. The flexible film is also controlled during unloading to ensure stability during winding, and finally the overall effect is good, with good application prospects.

[0062] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible film imprinting method, characterized in that: The steps include: (1) unwinding the flexible film to be processed, loading and caching the unwound flexible film, coating the first surface of the flexible film with UV glue, and coating the surface of the first stamping piece with UV glue; (2) pre-curing the UV glue coated on the first surface of the flexible film using a pre-curing member; (3) using a first stamping member to stamp the second surface of the flexible film, and using a second stamping member to stamp the first surface of the flexible film, wherein the first stamping member is printed with a first pattern, and the second stamping member is printed with a second pattern; A deviation-correcting member is connected to the second stamping member, the deviation-correcting member can adjust the position of the second stamping member, and the deviation-correcting member is controlled to adjust the position of the second stamping member and control the running speed of the second stamping member so that the first stamping member and the second stamping member are stamped synchronously; (4) curing the micro pattern embossed on the flexible film using a curing member, and then demolding; (5) using a strong curing member to re-cur the demolded flexible film; (6) The flexible film is cooled, then unloaded and buffered, and finally rolled up.

2. The flexible film imprinting method according to claim 1, characterized in that: During the stamping process of (3), a positioning camera is used to capture the position deviation between the marking points on the first stamping part and the second stamping part, and the deviation value is transmitted to the correction part, which adjusts the position of the second stamping part.

3. The flexible film imprinting method according to claim 1, characterized in that: In (1), between the unwinding and loading of the flexible film to be processed, if a roll of flexible film is used up, the material is replaced and the film is pressed by a cylinder, and the previous roll of film and the next roll of film can be connected together during the material replacement process.

4. The flexible film imprinting method according to claim 1, characterized in that: In (6), between material unloading and rewinding, if a roll of flexible film is used up, material replacement and film pressing are performed, and the flexible film is pressed by a cylinder, and the previous roll of film and the next roll of film can be connected together during the material replacement process.

5. The flexible film imprinting method according to claim 1, characterized in that: In (1), a hand expansion shaft is used in conjunction with a magnetic powder clutch during unwinding to provide unwinding tension control, and a first sensor is set to monitor the number of rotations during unwinding. By setting the roll diameter, film thickness, magnetic powder force and combining the first sensor to monitor the number of rotations to perform PID control, the tension of the flexible film is kept constant during continuous operation.

6. The flexible film imprinting method according to claim 1, characterized in that: In (6), a hand expansion shaft is used in conjunction with a magnetic powder clutch during winding to provide material tension control, and a second sensor is set to monitor the number of rotations during winding. By setting the winding diameter, film thickness, magnetic powder force and combining the second sensor to monitor the number of rotations, PID control is performed to keep the tension of the flexible film constant during continuous operation.

7. The flexible film imprinting method according to any one of claims 1 to 6, characterized in that: In (1), the weight of the counterweight wheel is used in conjunction with the weight addition and subtraction during material loading and caching to control the tension of the flexible film.

8. The flexible film imprinting method according to any one of claims 1 to 6, characterized in that: In (6), the weight of the counterweight wheel is used in conjunction with the weight addition and subtraction during material unloading and buffering to control the tension of the flexible film.

9. The flexible film imprinting method according to any one of claims 1 to 6, characterized in that: In (1), the process of applying UV glue to the first surface of the flexible film is as follows: The automatic glue dripping device is used to drip the UV glue onto the first side of the flexible film, and the scraper and the anilox roller are used together to evenly coat the UV glue onto the first side of the flexible film.

10. The flexible film imprinting method according to any one of claims 1 to 6, characterized in that: In (1), the process of applying UV glue to the first stamped part is: The UV glue is dripped onto the surface of the first stamping part by using an automatic glue dripping device, and the UV glue is evenly coated onto the surface of the first stamping part by using a scraper and anilox roller.

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