CN114734663A - Composite film production process for improving back stains - Google Patents
Composite film production process for improving back stains Download PDFInfo
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- CN114734663A CN114734663A CN202210320245.7A CN202210320245A CN114734663A CN 114734663 A CN114734663 A CN 114734663A CN 202210320245 A CN202210320245 A CN 202210320245A CN 114734663 A CN114734663 A CN 114734663A
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- film
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00278—Lenticular sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00432—Auxiliary operations, e.g. machines for filling the moulds
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Abstract
The invention discloses a production process of a composite film for improving back stains, which comprises the following steps of S1: coating glue on the back of the PET substrate, extruding the dried PET film through a roller to realize the back molding of the lower prism film, and hardening the prism film through a UV (ultraviolet) lamp; s2, film forming; s3, lower prism sheet forming and laminating: and gluing the acrylic ester adhesive and the solvent on the back surface of the upper film formed in the S2 at the head of coating equipment, wherein the gluing thickness is 1-10 um, simultaneously, forming an acrylic ester adhesive lower prism sheet on the front surface of the PET film back-coated in the S1 on the coating equipment, wherein the forming thickness is 5-40 um, and laminating the forming surface of the lower prism sheet and the gluing surface of the upper film together through a rolling shaft and hardening the lower prism sheet and the gluing surface of the upper film through irradiation of a lower UV lamp to form a composite film product. Through the mode, the stain on the back surface of the composite film is reduced by reducing the irradiation frequency of the UV ultraviolet rays of the back coating layer.
Description
Technical Field
The invention relates to the technical field of optical film production, in particular to a production process of a composite film for improving back stains.
Background
The optical composite film is simply a composite-POP of two or more optical functions integrated on one film, mainly including an upper Prism sheet and a lower Prism sheet, and a composite-DPP of an upper diffusion sheet (Diffuser) and a composite (Prism) of the upper Prism sheet and the lower Prism sheet, and the existing POP process is shown in fig. 1: PET back coating (UV) → lower prism sheet molding + bonding (UV) → upper prism sheet molding + bonding (UV), and the DPP process in the related art is shown in fig. 2: PET back coating (UV) → upper diffusion sheet molding → lower prism sheet molding + laminating (UV) → upper prism sheet molding + laminating (UV), wherein the PET1 back coating surface of POP and DPP is irradiated by three times of UV hardening, stains occur on the back surface of the composite film, and the stains need to be washed away by dust-free cloth or solvent.
The reasons for backside stains are as follows: the Over cure (Over cure) phenomenon caused by high light amount is a stain generated when unreacted materials (photoinitiator) of surface cross-linking appear on the surface, when the Over cure is performed in the back coating + UV process, the residual initiator is decomposed into low molecular substances due to UV absorption, the possibility that the low molecular substances fall off from the coating layer in the molding, bonding + UV process is high, and when the temperature is raised due to the Over cure, the coating layer becomes loose, for example, referring to the following, the low molecular substances are easy to fall off from the coating layer, for example, the light amount is 50mJ/cm2The Lamp temperature is 60 ℃; light quantity 100mJ/cm2The Lamp temperature is 100 ℃, the high molecular substance is not easy to fall off from the coating due to the crosslinking effect, the low molecular substance is easy to fall off from the coating, and the Tg of the base material is as follows: the wave warping phenomenon of the base material is more serious when the temperature is higher than 75-155 ℃, the base material keeps hard when the temperature is lower than Tg and becomes soft when the temperature is higher than Tg, and the light quantity of the UV over-hardening is 200mJ/cm2The temperature is 200 ℃, 400W of electricity is consumed, and the electricity consumed in the over-hardening process is much more than that in the proper hardening process.
The existing method for improving the back stains of the composite film comprises the steps of replacing back coating resin and adopting special high-quality back coating resin, but the method is high in cost, and based on the defects and shortcomings, the existing technology needs to be improved, and a composite film production process for improving the back stains is designed.
Disclosure of Invention
The invention mainly solves the technical problem of providing a composite film production process for improving back stains, and the stains on the back of the composite film are reduced by reducing the irradiation frequency of UV (ultraviolet) rays of a back coating.
In order to solve the technical problems, the invention adopts a technical scheme that: the production process of the composite film for improving the back stains comprises the following steps:
s1, back coating: the PET film delivered by the unwinding device sequentially passes through a buffer and a tension control device and then enters a coating device, back gluing is carried out on a PET substrate, the PET substrate is dried after the coating, a back organic solvent is evaporated, the heat resistance of the PET is improved, the dried PET film is extruded by a rolling shaft to realize the forming of the back of a lower prism film, the rolling shaft with different specifications is installed for forming according to different forming requirements, the prism film is hardened by a UV (ultraviolet) lamp, and the hardened prism film is collected by a winding device through a tensioning device;
s2, film forming;
s3, lower prism sheet forming and laminating: gluing Acrylate Binder and solvent on the back of the upper film formed in S2 at the head of a coating device, wherein the gluing thickness is 1-10 um, and simultaneously, forming Acrylate Binder lower prism sheets on the front of the PET film back-coated in S1 on the coating device, wherein the forming thickness is 5-40 um, forming lower prism sheets, and laminating the forming surfaces of the lower prism sheets and the gluing surface of the upper film in S2 through a rolling shaft, and hardening through irradiation of a lower UV lamp to form a composite film product.
Preferably, the upper film in S2 is a top Prism sheet or a DOP top diffusion sheet diffuiser compounded with a top Prism sheet Prism.
Preferably, the step of molding the upper prism sheet as the upper mold in S2 is as follows:
the method comprises the following steps: and (3) forming the PET film on coating equipment by using Acrylate Binder with the forming thickness of 5-40 um to form an upper prism sheet, and hardening the upper prism sheet by irradiating a lower UV lamp to form an upper die.
Preferably, the molding step of compounding the upper mold of S2 being the DOP upper diffusion sheet diffuiser and the upper Prism sheet Prism is as follows:
the method comprises the following steps: the PET film is coated with glue on a diffusion layer at the head of coating equipment, the PET film is hardened by irradiation of a lower UV lamp after being coated with the glue to form an upper diffusion sheet, the glue on the diffusion layer is a mixed solution of Acrylate Binder, Bead particles and a solvent, the specification of the Bead particles is 3-40 um particles, the diffusion performance is realized, light rays emitted from a light guide plate or a diffusion plate are uniformly diffused on a picture, the brightness is improved, and the light rays are diffused by the protruding Bead particles when passing through the diffusion layer;
step two: gluing Acrylate Binder and solvent on the back of the upper diffusion sheet at the head of a coating device, wherein the gluing thickness is 1-10 um, simultaneously, forming a PET film on the coating device by using Acrylate Binder with the forming thickness of 5-40 um to form an upper prism sheet, laminating the forming surface of the upper prism sheet and the gluing surface of the upper diffusion sheet together through a rolling shaft, and hardening through irradiation of a lower UV lamp to form an upper die.
Preferably, back coating is glued by adhesive, Bead granule and solvent in S1, the adhesive material is acryl Acrylate, the main raw materials of glue, the effect of glue shaping and fixed Bead granule, the Bead granule material is PBMA polymethyl methacrylate, and the specification is 1 ~ 10um particle, prevents that prism membrane and follow-up light guide plate from taking place the edge bonding, the solvent adopts butanone or toluene, plays the effect of adjusting glue viscosity.
Preferably, the UV light of S1-S3 is irradiated to cure with a proper light amount of 100mJ/cm2And the temperature is 100 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. special back coating resin is not needed, and stains on the back surface of the composite film are reduced by reducing the number of times of UV (ultraviolet) irradiation of the back coating;
2. in the process of back surface UV, unreacted substances can remain in the coating, so that the back surface UV irradiation is reduced to the minimum, and the unreacted substances are prevented from falling off the coating;
3. by lowering the temperature of the UV lamp, the optical film is prevented from being waved and UV-hardened to a proper light amount of 100mJ/cm2And the temperature is 100 ℃, 200W of electricity is consumed, and less electricity is consumed.
Drawings
Fig. 1 shows a production process of a conventional POP composite film.
FIG. 2 shows a process for producing a DPP composite film.
Fig. 3 is a schematic structural diagram of a production process of a POP composite film for improving back stains.
FIG. 4 is a schematic structural diagram of a DPP composite film production process for improving back surface stains.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the invention can be more readily understood by those skilled in the art, and the scope of the invention will be more clearly defined.
Referring to fig. 3 and 4, an embodiment of the invention includes:
the first embodiment is as follows:
a POP composite film production process for improving back stains comprises the following steps:
s1, back coating: the PET film delivered by the unreeling device sequentially passes through a buffer and a tension control device and then enters a coating device, back gluing is carried out on a PET1 substrate, the PET substrate is dried after the glue is coated, a back organic solvent is evaporated, the heat resistance of the PET is improved, the dried PET film is extruded by a roller to realize the forming of the back of a lower prism film, the roller with different specifications is installed for forming according to different forming requirements, the prism film is hardened by a UV lamp, and the hardened prism film is collected by a reeling device through a tensioning device;
s2, forming an upper prism sheet, forming a PET2 film on coating equipment by using Acrylate Binder Acrylate adhesive, wherein the forming thickness is 5-40 um, forming the upper prism sheet, and hardening through irradiation of a lower UV lamp to form an upper die;
s3, lower prism sheet forming and laminating: and gluing the Acrylate Binder and the solvent on the back surface of the upper prism sheet at the head of a coating device in the S2, wherein the gluing thickness is 1-10 um, simultaneously, forming the lower prism sheet of the Acrylate Binder on the front surface of the PET1 film coated on the back in the S1 on the coating device, the forming thickness is 5-40 um, laminating the forming surface of the lower prism sheet and the gluing surface of the back surface of the upper prism sheet together through a rolling shaft, and hardening through the irradiation of a lower UV lamp to form a POP composite film product.
The second embodiment is as follows:
the production process of the DPP composite membrane for improving the back stains comprises the following steps:
s1, back coating: the PET1 film delivered by the unwinding device sequentially passes through a buffer and a tension control device and then enters a coating device, back gluing is carried out on a PET substrate, air drying is carried out after the glue coating, a back organic solvent is evaporated, the heat resistance of PET is improved, the dried PET film is extruded by a roller to realize the forming of the back of a lower prism film, the roller with different specifications is installed for forming according to different forming requirements, the prism film is hardened by a UV (ultraviolet) lamp, and the hardened prism film is collected by a winding device through a tensioning device;
s2, compounding and molding the upper diffusion sheet Diffuser and the upper Prism sheet Prism of the DOP comprises the following steps:
the method comprises the following steps: the PET3 film is coated with glue on a diffusion layer at the head of coating equipment, the glue is hardened by the irradiation of a lower UV lamp to form an upper diffusion sheet, the glue on the diffusion layer is a mixed solution of Acrylate Binder, Bead particles and a solvent, the specification of the Bead particles is 3-40 um particles, the diffusion performance is realized, light emitted from a light guide plate or a diffusion plate is uniformly diffused on a picture, the brightness is improved, and when the light passes through the diffusion layer, the light is diffused by the protruded Bead particles;
step two: gluing Acrylate Binder and a solvent on the back of the upper diffusion sheet at the head of coating equipment, wherein the gluing thickness is 1-10 um, meanwhile, forming a PET2 film on the coating equipment by using Acrylate Binder with the forming thickness of 5-40 um to form an upper prism sheet, and adhering the upper prism sheet forming surface and the upper diffusion sheet gluing surface together through a rolling shaft, and hardening through the irradiation of a lower UV lamp to form an upper mold;
s3, lower prism sheet forming and laminating: in S2, gluing Acrylate Binder and solvent on the back surface of a lower prism sheet PET2 at the head of coating equipment, wherein the gluing thickness is 1-10 um, simultaneously, carrying out Acrylate Binder lower prism sheet molding on the front surface of the PET1 film coated on the back surface of S1 on the coating equipment, wherein the molding thickness is 5-40 um, laminating a lower prism sheet PET1 molding surface and an upper prism sheet PET2 back gluing surface together through a rolling shaft, and hardening through irradiation of a lower UV lamp to form a DPP composite film product.
The glue for back coating in the S1 is composed of an adhesive, Bead particles and a solvent, wherein the adhesive is made of Acrylate, the main raw material of glue and the effects of glue forming and fixing the Bead particles, the Bead particles are made of PBMA polymethyl methacrylate (PBMA), the specification of the Bead particles is 1-10 um particles, the prism film and a subsequent light guide plate are prevented from being adhered, and the solvent is butanone or toluene and plays a role in adjusting the viscosity of the glue.
Preferably, the UV light of S1-S3 is irradiated to cure with a proper light amount of 100mJ/cm2And the temperature is 100 ℃.
In the two production processes of the composite film for improving the stain on the back surface, the back surface of the lower prism film, namely PET1 is irradiated and hardened by a UV lamp only in S1 and S3, and the UV times are reduced from three times to two times.
According to the production process of the composite film for improving the stains on the back surface, the stains on the back surface of the composite film are reduced by reducing the UV irradiation frequency of the back coating, the temperature of a UV lamp is reduced, the optical film is prevented from being warped by waves, the UV hardening is proper, and less electric quantity is consumed.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A production process of a composite film for improving back stains is characterized by comprising the following steps: the method comprises the following steps:
s1, back coating: the PET film delivered by the unreeling device sequentially passes through a buffer and a tension control device and then enters a coating device, back gluing is carried out on a PET substrate, the PET substrate is dried after the glue is coated, an organic solvent on the back is evaporated, the dried PET film is extruded by a rolling shaft to realize the forming of the back of a lower prism film, the prism film is hardened by a UV lamp, and the hardened prism film is collected by a reeling device through a tensioning device;
s2, film forming;
s3, forming and attaching a lower prism sheet: and gluing the acrylic ester adhesive and the solvent on the back surface of the upper film formed in the S2 at the head of a coating device, wherein the gluing thickness is 1-10 um, simultaneously, forming an acrylic ester adhesive lower prism sheet on the front surface of the PET film coated on the back surface in the S1 on the coating device, wherein the forming thickness is 5-40 um, and adhering the lower prism sheet forming surface and the gluing surface of the upper film in the S2 together through a rolling shaft, and hardening through the irradiation of a UV lamp at the lower part to form a composite film product.
2. A process for producing a composite film for improving backside stains according to claim 1, wherein: the upper film in S2 is a composite of upper prism sheet or DOP upper diffusion sheet and upper prism sheet.
3. A process for producing a composite film for improving backside stains according to claim 2, wherein: the molding step of the upper mold in the S2 being an upper prism sheet is as follows:
the method comprises the following steps: and forming the PET film on coating equipment by using an acrylate adhesive, wherein the forming thickness is 5-40 um, forming an upper prism sheet, and hardening by irradiating a UV lamp below the upper prism sheet to form an upper die.
4. A process according to claim 2 for producing a composite film for improving backside soiling, wherein: the molding step of compounding the DOP upper diffusion sheet and the upper prism sheet in the upper mold of S2 is as follows:
the method comprises the following steps: the PET film is coated with glue on a diffusion layer at the head of coating equipment, the PET film is hardened by irradiation of a lower UV lamp to form an upper diffusion sheet after being coated with the glue, the glue on the diffusion layer is a mixed solution of an acrylate adhesive, Bead particles and a solvent, the specification of the Bead particles is 3-40 um particles, and the diffusion performance is realized;
step two: and gluing the acrylate adhesive and the solvent on the back surface of the upper diffusion sheet at the head of the coating equipment, wherein the gluing thickness is 1-10 um, meanwhile, forming the PET film on the coating equipment by using the acrylate adhesive, wherein the forming thickness is 5-40 um, forming an upper prism sheet, laminating the upper prism sheet forming surface and the upper diffusion sheet gluing surface together through a rolling shaft, and hardening through irradiation of a UV lamp below to form an upper mold.
5. A process for producing a composite film for improving backside stains according to claim 1, wherein: back coating is glued by adhesive, Bead granule and solvent among S1, the adhesive material is acrylic ester, Bead granule material is polymethyl methacrylate, and the specification is 1 ~ 10um particle, butanone or toluene are adopted to the solvent.
6. A process according to claim 1 for producing a composite film for improving backside stains, wherein: UV light of S1-S3 with proper light amount of 100mJ/cm2And the temperature is 100 ℃.
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| CN202210320245.7A CN114734663A (en) | 2022-03-29 | 2022-03-29 | Composite film production process for improving back stains |
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| CN202210320245.7A CN114734663A (en) | 2022-03-29 | 2022-03-29 | Composite film production process for improving back stains |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20140021925A (en) * | 2012-08-13 | 2014-02-21 | 채용욱 | Optical sheet for backlight unit and method thereof |
| CN106707377A (en) * | 2016-12-23 | 2017-05-24 | 合肥乐凯科技产业有限公司 | Preparation method of multilayer composite film for backlight module set |
| CN106908872A (en) * | 2017-01-20 | 2017-06-30 | 宁波长阳科技股份有限公司 | A kind of anti-scratch diffusion barrier and preparation method thereof |
| CN107831620A (en) * | 2016-12-07 | 2018-03-23 | 常州华威新材料有限公司 | A kind of novel and multifunctional optical compound film and preparation method thereof |
| CN111443516A (en) * | 2019-09-25 | 2020-07-24 | 宁波激智科技股份有限公司 | Optical composite film and preparation method thereof |
| CN112433280A (en) * | 2020-11-18 | 2021-03-02 | 合肥乐凯科技产业有限公司 | Optical composite film and preparation method thereof |
-
2022
- 2022-03-29 CN CN202210320245.7A patent/CN114734663A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140021925A (en) * | 2012-08-13 | 2014-02-21 | 채용욱 | Optical sheet for backlight unit and method thereof |
| CN107831620A (en) * | 2016-12-07 | 2018-03-23 | 常州华威新材料有限公司 | A kind of novel and multifunctional optical compound film and preparation method thereof |
| CN106707377A (en) * | 2016-12-23 | 2017-05-24 | 合肥乐凯科技产业有限公司 | Preparation method of multilayer composite film for backlight module set |
| CN106908872A (en) * | 2017-01-20 | 2017-06-30 | 宁波长阳科技股份有限公司 | A kind of anti-scratch diffusion barrier and preparation method thereof |
| CN111443516A (en) * | 2019-09-25 | 2020-07-24 | 宁波激智科技股份有限公司 | Optical composite film and preparation method thereof |
| CN112433280A (en) * | 2020-11-18 | 2021-03-02 | 合肥乐凯科技产业有限公司 | Optical composite film and preparation method thereof |
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