KR102397482B1 - The forming mehtod for PC polarized film - Google Patents

Abstract

The present invention relates to a method for forming a polycarbonate (PC) polarizing film, and more particularly, to a method for forming a PC polarizing film, in which the PC polarizing film is formed to have a desired curvature value. The method for forming the PC polarizing film includes: (a) preparing a polarizing film including a polyvinyl alcohol (PVA) film, a PC film attached to both surfaces of the PVA film, and a protective film attached to both surfaces of the PC film; (b) processing the polarizing film in a wafer form; (c) performing a forming pretreatment on the polarizing film processed in the wafer form; (d) forming the pretreated polarizing film to have a predetermined curvature; (e) inspecting the formed polarizing film; and (f) packaging the inspected polarizing film.

Description

Forming method of PC polarized film {The forming method for PC polarized film}

The present invention relates to a method of forming a PC polarizing film, and more particularly, to a forming method of a PC polarizing film capable of forming a PC polarizing film to have a desired curvature value.

When natural light, which is reflected by natural objects and repeats reflections and refractions, is received as it is, glare occurs. In this case, glare can be reduced by wearing polarized lenses that apply the principle of polarization.

Here, polarization refers to a wave of light that is transmitted through a polarizing film (polarizer) in only one direction in which natural light, which is repeatedly reflected and refractioned, is vibrated in a specific direction.

These polarized lenses can reduce glare by blocking reflected and refracted light at sunrise or sunset, and lengthen the visible distance at which objects can be seen.

In addition, wearing polarized lenses while driving a car blocks unnecessary light and secures a wide field of view, which helps safe driving.

In general polarizing lenses, a polarizing film (polarizer) is heated and attached to the surface of a plastic or glass lens, or a polarizing film is molded into a lens shape in advance, and then a liquid such as CR-39 (allyl diglycol carbonate) or urethane is formed on both sides of the polarizing film. Either use a casting method in which the monomer or oligomer of It is manufactured using the method of inserting into the injection machine and reinforcing the thickness through insert injection. In particular, in the case of a polarizing film for sunglasses, there is a problem that it is easily broken when a TAC (Tri Acetyl Cellulose) film is attached to the polarizing film, so a PC film with strong strength has been attached to the polarizing film.

When a PC film laminated PVA (PolyVinyl Alcohol) polarizing film is to be formed with a constant curvature, there is a problem in that it is difficult to easily form the curvature due to the physical characteristics of the PC film.

In addition, when customers request a PVA film laminated with a PC film to have a desired curvature value, there is a problem in that it is not easy to respond because the curvature desired by each customer is different.

(Document 1) Registered Patent Publication No. 10-1088971 (Registered on Nov. 1, 2011) (Document 2) Registered Patent Publication No. 10-1280129 (Registered on June 24, 2013) (Document 3) Registered Patent Publication No. 10-1456394 (Registered on October 23, 2014) (Document 4) Patent Publication No. 10-2019-0010460 (published on January 30, 2019)

The present invention has been devised to solve the above problems, and an object of the present invention is to provide a forming method of a PC polarizing film having a constant curvature.

In addition, an object of the present invention is to provide a forming method of a PC polarizing film that can be formed according to the curvature desired by customers.

In order to achieve the above object, the present invention, (a) preparing a polarizing film formed of a PVA film and a PC film attached to both surfaces of the PVA film and a protective film attached to both surfaces of the PC film; (b) processing the polarizing film into a wafer shape; (c) pre-forming the polarizing film processed into the wafer shape; (d) forming the pre-treated polarizing film to have a constant curvature; (e) inspecting the formed polarizing film; and (f) packaging the polarizing film on which the inspection has been completed; provides a forming method of a PC polarizing film comprising: a.

In step (b) of the present invention, the shrinkage ratio according to the desired curvature value is calculated during the forming step of the polarizing film, and the calculated shrinkage ratio is processed into a wafer form.

In the present invention, it is characterized in that the nudge portion indicating the polarization axis is formed when processing into a wafer shape when processing into a wafer shape.

In the present invention, (c) the step of pre-forming the polarizing film processed in the wafer form is prevented from being different from the transmittance and color value of the film processed in the form of a wafer by high temperature in the forming step from the transmittance and color value after forming It is characterized in that the polarizing film is stabilized for 12 hours at a temperature of 80° C.

In the present invention, (d) forming the pre-treated polarizing film to have a constant curvature includes: (d-1) preparing a constant mold having a desired curvature value; (d-2) mounting the mold on a forming machine, and applying a vacuum pressure to a hole formed in the center of the mold so that the pretreated polarizing film has a constant curvature; and (d-3) rotating the mold to which the vacuum pressure is applied at a constant speed while maintaining the mold at an internal temperature of 140 to 150° C. for 4 minutes 30 seconds to 5 minutes 30 seconds to form a desired curvature value; characterized.

In the present invention (e) the step of inspecting the formed polarizing film is characterized in that the inspecting transmittance, color value, curvature and size of the formed polarizing film.

The forming method of the PC polarizing film according to the present invention has the advantage that the PC polarizing film can be formed according to the curvature desired by customers because the PC polarizing film can be formed to have a certain curvature.

1 is a flowchart for a forming method of a PC polarizing film according to the present invention.
2 is a structural diagram of a PC polarizing film according to the present invention.
3 is a plan view of a polarizing film in a state in which the PC polarizing film according to the present invention is processed into a wafer shape.
4 is a cross-sectional view showing a forming machine for forming a PC polarizing film according to the present invention in a molder.
5 is a cross-sectional view of a molder of a PC polarizing film according to the present invention.
6 is a cross-sectional view of the PC polarizing film according to the present invention is formed.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, this is for the purpose of describing in detail enough that a person of ordinary skill in the art to which the present invention pertains can easily implement the invention, and this does not mean that the technical spirit and scope of the present invention is limited thereto.

1 is a flowchart of a forming method of a PC polarizing film according to the present invention, FIG. 2 is a structural diagram of a PC polarizing film according to the present invention, and FIG. 3 is a state in which the PC polarizing film according to the present invention is processed into a wafer form. It is a plan view of a polarizing film, FIG. 4 is a cross-sectional view showing a forming machine for forming a PC polarizing film according to the present invention in a molder, FIG. 5 is a cross-sectional view of a molder of a PC polarizing film according to the present invention, and FIG. 6 is the present invention It is a cut-away view of the PC polarizing film according to the foamed state.

1 shows a forming method of a PC polarizing film according to the present invention. As shown in the figure, the forming method of the PC polarizing film comprises the steps of (a) preparing a polarizing film formed of a PVA film, a PC film attached to both sides of the PVA film, and a protective film attached to both surfaces of the PC film (S1), (b) processing the polarizing film in the form of a wafer (S2), (c) pre-forming the polarizing film processed in the wafer form (S3), (d) the pre-treated Forming the polarizing film to have a certain curvature (R) (S4), (e) inspecting the formed polarizing film (S5), (f) packaging the polarizing film on which the inspection is completed ( S6). Each step will be described with reference to the drawings.

First, a step (S1) of preparing a polarizing film is performed. As shown in FIG. 2 , the polarizing film 1 includes a polyvinyl alcohol (PVA) film 11 which is a polarizer, a polycarbonate (PC) film 12 attached to both sides of the PVA film 11, and both PCs. Prepare a polarizing film (1) consisting of a protective film (13) attached to the film (12). The PVA film 11 and the PC film 12 are laminated using an organic solvent or water-based adhesive.

Next, a step (S2) of processing the polarizing film into a wafer shape is performed. In the step of processing the polarizing film into a wafer shape, a shrinkage ratio according to a desired curvature value is calculated during the forming step of the polarizing film, and processed into a wafer shape based on the calculated shrinkage ratio. In the case of processing the polarizing film 1 in the wafer form, since the forming step is performed at a high temperature, it should be processed in the wafer form in consideration of the shrinkage rate during forming. That is, the polarizing film 1 ′ processed into a wafer shape may have an elliptical shape instead of a circular shape because the shrinkage ratio of the polarization axis MD and the shrinkage ratio of the axis TD perpendicular to the polarization axis MD are different. Accordingly, the overall shape can be a garden after forming. This shrinkage is calculated and processed into a wafer shape. In addition, since the forming step of the polarizing film has to be manufactured with the desired curvature (R) by the customer, the shrinkage ratio according to the curvature value is calculated and processed into a wafer form. When the polarizing film 1 is processed into a wafer shape, the polarization axis must be displayed on the polarizing film, so a nudge part is also processed on the wafer type polarizing film. 3 shows a polarizing film 1' processed into a wafer shape. As shown in the figure, in the polarizing film 1 ′ processed into a wafer shape, nudges 14 are formed on the polarization axis, and the nudges 14 are provided on both sides through which the polarization axis passes. In addition, the nudge 14 is also used as a fixing groove for fixing both sides of the mold during processing.

Next, a step (S3) of pre-forming the polarizing film processed into a wafer shape is performed. Since the pre-forming treatment is performed at a high temperature during forming, the pre-forming treatment is performed to prevent the transmittance and color value of the polarizing film processed into a wafer form from being different from the transmittance and color value after forming. Foaming pretreatment is a pretreatment step of stabilizing in a drying zone for 12 hours at a temperature of 80 ℃.

Next, a step (S4) of forming the pretreated polarizing film to have a constant curvature (R) is performed. In the forming method, a wafer-shaped polarizing film 1' is placed on a rotating mold while maintaining the inside of the forming machine at a constant temperature, vacuum pressure is applied to the mold, and the polarizing film 1' is adsorbed to the mold at a constant temperature and The curvature R is formed by maintaining it for a certain period of time. The internal temperature during the forming is maintained at 140 ~ 150 ℃, the time is 4 minutes 30 seconds to 5 minutes 30 seconds to form in the mold to form a constant curvature (R). As shown in FIGS. 4 and 5 , a vacuum pressure action hole 101 is formed on the central side of the mold 100 , and when the polarizing film 1 ′ is mounted, the forming machine 200 operates and vacuum pressure is applied to the mold side. , and thus the polarizing film 1 ′ is adsorbed to the mold 100 to form a certain curvature R. Specifically, the forming step includes a step (S4-1) of preparing a constant mold 100 having a desired curvature R, and mounting the mold 100 in the forming machine 200, and pretreated polarizing film 1' ) applying a vacuum pressure to the hole 101 formed in the center of the mold to have a constant curvature (R) (S4-2), and the mold 100 to which the vacuum pressure is applied is heated to an internal temperature of 140 ~ 150 °C. It consists of a step (S4-3) of forming a desired curvature (R) by rotating it at a constant speed while maintaining it for 30 minutes to 5 minutes and 30 seconds. The mold 100 may be made of an aluminum material, and is manufactured according to a certain curvature (R). When the mold 100 is manufactured, the mold 100 is mounted on the forming machine 200 and vacuum pressure is applied thereto. The working vacuum pressure is about 0.085 MPa. If the vacuum pressure is too low, the formed polarizing film may be deformed because the adsorption force is large, so an appropriate vacuum pressure should be applied. A constant curvature (R) is formed on the polarizing film while maintaining the inside of the forming machine at a constant temperature for a certain period of time while rotating at a constant rotation speed in a state in which vacuum pressure is applied.

Next, a step (S5) of inspecting the formed polarizing film is performed. The formed polarizing film 1" is inspected for transmittance, color value, and curvature (R). Transmittance and color value are inspected using a spectrophotometer, and the curvature (R) is measured using a curve gauge or height gauge. Inspect the curvature (R) using the , and the size is measured using vernier calipers. If the measured value is within the normal range, the polarizing film (1") is accurately manufactured, so proceed to the next step.

Next, the inspected polarizing film 1" goes through a packaging step. The packaging is packaged in a zipper bag by 100Pcs and then packaged in an inbox. Packaging may be made in various forms, but is not limited thereto.

Although the embodiments have been described by way of example above, the fact that the present invention can be embodied in various other forms without departing from the spirit and scope thereof is apparent to those of ordinary skill in the art. Accordingly, the above-described embodiments are to be regarded as illustrative rather than restrictive, and all implementations within the scope of the appended claims and their equivalents will be included within the scope of the present invention.

1, 1', 1": Polarizing film
11: PVA film 12: PC film
13: protective film 14: nudge
100: mold 101: hole
200: forming machine

Claims (6)

(a) preparing a polarizing film formed of a PVA film and a PC film attached to both surfaces of the PVA film with an adhesive and a protective film attached to both surfaces of the PC film;
(b) calculating the shrinkage according to the desired curvature value during the forming step of the polarizing film, processing it into an elliptical wafer shape based on the calculated shrinkage ratio, and a nudge portion indicating the polarization axis when processing into the wafer shape being processed;
(c) In order to prevent the transmittance and color value of the polarizing film processed into the wafer form from being different from the transmittance and color values of the film processed into the wafer form by high temperature in the forming step at a temperature of 80° C. for 12 hours Foaming pre-treatment step to stabilize during;
(d) (d-1) preparing a predetermined mold made of an aluminum material having a desired curvature value; (d-2) mounting the mold on a forming machine, and applying a vacuum pressure of 0.085 Mpa to the hole formed in the center of the mold so that the pretreated polarizing film has a constant curvature; and (d-3) forming a desired curvature value by rotating the mold to which the vacuum pressure is applied at a constant speed while maintaining the mold at an internal temperature of 140 to 150° C. for 4 minutes 30 seconds to 5 minutes 30 seconds ;
(e) inspect the transmittance, color value, curvature and size of the formed polarizing film, the transmittance and color value of the polarizing film are inspected using a spectrophotometer, and the curvature (R) is a curve gauge or checking the curvature (R) using a height gauge, measuring the size using a vernier caliper, and checking whether the measured value is within a normal range; and
(f) packing the polarizing film on which the inspection is completed in an inbox after putting 100Pcs each in a zipper bag;
Forming method of PC polarizing film, characterized in that consisting of. delete delete delete delete delete

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