JP7301452B2 - Optical film using marking, optical film manufacturing apparatus and manufacturing method - Google Patents

Description

TECHNICAL FIELD Embodiments of the present invention relate to an optical film using marking, an optical film manufacturing apparatus, and a manufacturing method.

In general, optical films undergo manufacturing processes such as stretching, surface treatment, and slitting. The manufacturing process of such an optical film is mainly performed by a roll to roll (R2R) method.

In the case of the optical film surface treatment step, the optical film is unwound, surface treated, cured, and wound up in this order. The winding process is the final stage of the optical film production process, and if defects occur, it is not easy to resolve them, which may lead to deterioration in product quality.

In order to wind the optical film normally after the R2R process, there are various factors such as the distribution of the winding tension applied to the film, the thickness deviation of the film, the slip resistance of the film, the roughness of the film surface, and the density of the wound film. must be considered.

Cases of defective film winding include meandering of the film in the direction perpendicular to the running direction during winding, and pressing failure due to the winding core fixing tape. In this case, in order to suppress meandering defects, the winding tension should be increased or the slip resistance of the film should be increased to minimize the amount of air drawn between the laminated films during winding. In order to prevent poor pressing, the winding tension must be lowered and the amount of air drawn between the films during winding must be increased.

However, it is difficult to solve meandering and poor pressing during the film winding process only by adjusting the winding tension of the film as in the conventional method.

In addition, when the surface of a conventional optical film is surface-treated, the additive is contained in the coating liquid. Therefore, compared to a single optical film, the surface energy is low and the slip resistance is low.

The present invention has been made in order to solve the above problems, and takes into consideration the fact that the physical properties of a stretched optical film vary along the axial direction, and is optimized for marking formation and winding. An object of the present invention is to provide an optical film, an optical film manufacturing apparatus, and a manufacturing method that can prevent the meandering of the film.

An apparatus for manufacturing an optical film according to the present invention includes a supply unit that supplies an optical film in a first direction; a receiving unit that is spaced from the supply unit and winds the optical film supplied from the supply unit; a marking section disposed between the section and the receiving section for illuminating the optical film with a light source to form a marking.

Also, a driving unit connected to the marking unit to move the marking unit is further included, and as the marking unit moves, the marking is formed to form a predetermined angle with the first direction.

Protrusions may be formed on both sides of the marking on the optical film.

Also, the protrusions formed on both sides of the marking may have different heights in the direction of protrusion.

Also, the optical film may include a marking area and an effective area, and the marking may be formed in a predetermined section of the marking area.

Also, the effective area may be formed in the central portion along the longitudinal direction of the optical film, and the marking areas may be formed at the periphery of the optical film so as to be disposed on both sides of the effective area. .

Also, a plurality of the marking units may be provided in the marking area.

Also, the marking may form an angle of 0° to 180° with the first direction.

Further, a coating unit that forms a coating layer on one surface of the optical film is further included between the supply unit and the reception unit, and the marking unit is spaced apart from the coating unit with the optical film interposed therebetween. and a marking can be formed on the other surface of the optical film.

The coating layer is formed on a first area formed on one surface of the optical film, and the marking is formed on a second surface of the optical film opposite to the one surface on which the coating layer is formed. The first region and the second region formed in regions may not overlap in a direction perpendicular to the first direction.

A method for manufacturing an optical film according to the present invention includes the steps of: supplying an optical film from a supply unit along a first direction; and determining a marking formation path by adjusting a marking unit arranged outside the optical film. irradiating the optical film from the marking unit with a light source to form a marking; and winding the optical film on which the marking is formed by a receiving unit spaced apart from the supplying unit. can be done.

Also, the marking may be formed to form a predetermined angle with the first direction.

Protrusions may be formed on both sides of the marking on the optical film.

Also, the protrusions formed on both sides of the marking may have different heights in the direction of protrusion.

The method may further include forming a coating layer on one surface of the optical film after supplying the optical film from the supply unit along the first direction.

Also, the markings are formed on the other surface of the optical film having a coating layer formed on one surface thereof.

The coating layer is formed on a first area formed on one surface of the optical film, and the marking is formed on a second surface of the optical film opposite to the one surface on which the coating layer is formed. The first region and the second region formed in regions may not overlap in a direction perpendicular to the first direction.

The optical film according to the present invention can be produced by any of the optical film production methods described above.

Also, the marking may be formed in a groove shape, and the groove depth of the marking may be formed at a ratio of 0.5 to 5 when the total thickness of the optical film is 10.

Also, the height of the protrusions formed on both sides of the marking may be formed at a ratio of 0.5 to 10 when the total thickness of the optical film is 10.

In the optical film using marking according to the present invention, the apparatus for manufacturing the optical film, and the method for manufacturing the optical film, the marking is formed so as to form a predetermined angle with the axial direction, and the height of the protrusion is formed differently. Another effect is that it is possible to form an optimum marking corresponding to the difference in physical properties along the axial direction of the stretched optical film.

In addition, the protrusions formed on both sides of the marking increase the surface energy, friction coefficient, and slip resistance, thereby preventing meandering during winding of the film.

In addition, air is drawn into the space between the laminated films at the time of winding, so that there is an effect that it is possible to eliminate pressing failure caused by the winding core fixing tape.

In addition, a coating layer is formed on one surface of the film manufactured by the optical film manufacturing apparatus and manufacturing method according to the present invention, and a marking is formed on the other surface opposite to the one surface. Slip resistance is increased, and meandering during winding can be prevented.

In addition, since the coating layer and the markings do not overlap in the direction perpendicular to the longitudinal direction of the film, there is an effect that the probability of breakage during winding of the film can be reduced.

Of course, such an effect does not limit the scope of the present invention.

1 is a perspective view schematically showing an optical film manufacturing apparatus according to a first embodiment of the present invention; FIG. 1 is a side view schematically showing an optical film manufacturing apparatus according to a first embodiment of the present invention; FIG. It is the figure which expanded the A part of FIG. It is the figure which expanded the A part of FIG. 1 is a plan view partially showing an optical film manufacturing apparatus according to a first embodiment of the present invention; FIG. FIG. 10 is a diagram showing markings formed to form a predetermined angle with respect to the first direction; FIG. 10 is a diagram showing markings formed to form a predetermined angle with respect to the first direction; FIG. 10 is a diagram showing markings formed to form a predetermined angle with respect to the first direction; 4 is a graph showing the height of each projection according to the formation angle of markings; 4 is a flow chart showing a method for manufacturing an optical film according to the first embodiment of the present invention; FIG. 6 is a perspective view schematically showing an optical film manufacturing apparatus according to a second embodiment of the present invention; FIG. 6 is a side view schematically showing an optical film manufacturing apparatus according to a second embodiment of the present invention; It is the figure which expanded the A part of FIG. FIG. 5 is a plan view showing an optical film manufacturing apparatus according to a second embodiment of the present invention; FIG. 5 is a side view showing an optical film according to a second embodiment of the invention; 6 is a flow chart showing a method for manufacturing an optical film according to a second embodiment of the present invention; 4 is a graph showing water contact angles according to heat treatment temperatures. 4 is a graph showing surface energy according to heat treatment temperature; FIG. 5 is a graph showing the coefficient of friction (COF) of the optical film according to the second embodiment of the present invention according to the heat treatment temperature; FIG. 4 is a graph showing the coefficient of friction of an optical film that has not been surface-treated, depending on the heat treatment temperature.

Hereinafter, configurations and actions of specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Here, in attaching reference numerals to constituent elements in each drawing, it should be noted that as far as the same constituent elements are concerned, the same constituent elements are indicated by the same reference numerals as much as possible even if they are displayed on other drawings. .

FIG. 1 is a perspective view schematically showing an optical film manufacturing apparatus according to a first embodiment of the present invention, and FIG. 2 is a side view schematically showing the optical film manufacturing apparatus according to the first embodiment of the present invention. It is a diagram.

1 and 2, the optical film manufacturing apparatus 1 according to the first embodiment of the present invention may include a supply unit 100, a receiving unit 200, a marking unit 300, and a driving unit 400. .

Specifically, the supply unit 100 according to the first embodiment of the present invention supplies the optical film 10 (hereinafter referred to as "film") along a first direction (from left to right in FIG. 2). , can rotate clockwise or counterclockwise under external power.

In this case, the supply unit 100 rotates clockwise (reference to FIG. 2), the wound film 10 spreads, and moves toward the receiving unit 200 spaced apart from the supply unit 100 .

The film 10 moving from the feeding section 100 to the receiving section 200 side is wound up while the receiving section 200 receives power from the outside and rotates clockwise.

The receiving unit 200 according to the first embodiment of the present invention is spaced apart from the supplying unit 100 and can wind the film 10 supplied from the supplying unit 100 .

The receiving unit 200 rotates clockwise or counterclockwise by receiving power from the outside, and can wind the film 10 supplied from the supplying unit 100 while rotating clockwise with reference to FIG.

The film 10 moves from the supply unit 100 to the receiving unit 200 along the first direction, and the marking unit 300, which will be described later, irradiates one surface of the film 10 (upper surface in FIG. 2) with the light source L to form grooves and grooves. A marking 16 having the shape of (groove) is formed.

The marking station 300 is located between the supply station 100 and the receiving station 200 and can illuminate the film 10 with a light source L to form the markings 16 .

In the present invention, the light source L is a laser, and by irradiating the film 10 with the light source L, a marking 16 having a groove shape is formed in a preset predetermined section, and a section in which the marking 16 is formed. , protrusions 17 are formed to protrude outward (reference upper side in FIG. 3) along both sides of the marking 16 .

The height of the protruding part 17 is formed relatively higher than the bottom surface corresponding to the groove of the marking 16, and protrudes upward from the one surface of the film 10 (reference upper side in FIG. 3) before the marking 16 is formed.

Referring to FIG. 3, the protrusions 17 may have a constant height based on the top surface of the film 10 (based on FIG. 3).

The protruding part 17 can serve as a guide so that the film 10 does not tilt to one side while being received by the receiving part 200 .

Although not shown, a protrusion 17 is formed on the upper surface of the film 10 (referenced in FIG. 2), and the film 10 is stacked in the centrifugal direction with the center of the receiving part 200 as the reference while being wound by the receiving part 200 . At this time, the protrusion 17 comes into contact with the lower surface of the film 10 laminated on the outer side of the protrusion 17, so that the contact pressure increases and the slip resistance increases.

In addition, the protruding portion 17 increases the surface energy, and there is an effect that meandering due to slip during winding can be prevented.

In addition to this, when the film 10 forms layers and is stacked on the receiving part 200, there is an effect that the intervals between the layers can be kept constant.

In addition, it is possible to prevent the film 10 from being damaged or broken due to the pressing pressure of the film 10 arranged on the upper side when an unexpected foreign substance is introduced in the manufacturing process of the film 10 . There is an effect that the surface pressure in the winding core direction can be increased as the protruding portion 17 becomes higher.

The protrusions 17 are formed on both sides of the marking 16 having the shape of a groove. As shown in FIG. 3, the heights h1 and h2 of the protrusions 17 on both sides are equal. be.

Unlike this, the marking unit 300 can adjust the irradiation path and angle of the light source L by receiving power from the driving unit 400, which will be described later. 17 heights h1, h2 are formed differently. This will be explained in detail later.

Specifically, the groove depth d of the marking 16 is preferably formed at a ratio of 0.5 to 5 when the total thickness t of the optical film 10 is 10.

That is, when the groove depth d of the marking 16 is formed at a ratio of 0.5 or less, there is a problem that the protruding portion 17 is not formed at an appropriate height. That is, the groove depth d and the height of the protrusion 17 increase in proportion, but when the groove depth d is shallow and the height of the protrusion 17 is low, the effect of increasing the slip resistance is small. sell.

Conversely, if the groove depth d of the marking 16 is formed at a ratio of 5 or more, there is a problem that the risk of breakage of the optical film 10 may increase sharply.

In addition, the height of the protrusions 17 formed on both sides of the marking 16 is preferably formed at a ratio of 0.5 to 10 when the total thickness t of the optical film 10 is 10.

That is, when the heights h1 and h2 of the protrusions 17 are formed at a ratio of 0.5 or less, there is a problem that the effect of increasing the slip resistance may be slight.

Conversely, when the heights h1 and h2 of the protrusions 17 are formed at a ratio of 10 or more, the groove depth d is excessively increased, and the risk of breakage of the optical film 10 may increase sharply. .

When the heights h1 and h2 of the protrusions 17 and the groove depth d are increased by increasing the laser output or changing the pattern angle of the marking 16, the height ratio of the protrusions 17 is 10 or more. does not increase any further and reaches saturation, but the groove depth d continues to increase. When the height ratio of the projecting portion 17 is about 10, the ratio of the groove depth d is about 5, so it is preferable to select this value as the reference ratio value.

In this case, a coating layer (not shown) having a predetermined thickness may be laminated on either one of the front surface and the rear surface of the optical film 10 or both the front surface and the rear surface of the optical film 10 . When a coating layer is formed on the surface of the optical film 10 , the markings 16 are formed on the coating layer of the optical film 10 .

The coating layer provides various functional roles such as anti-reflection, anti-glare, anti-scattering, and optical film protective.

In this case, the coating used in the present invention is an ASG (Anti-semi-glare) coating. The coating layer is generally made of a harder material than the film, is sensitive to breakage, and has a low surface energy (PET film 45 mN/m>ASG_PET film 30 mN/m). As the surface energy becomes lower, slippage tends to occur during the winding process of the optical film 10 . As a result, a protruding portion 17 is formed on the peripheral edge of the optical film 10 by laser marking. In this case, when the laser marking 16 is formed on the surface of the optical film 10 on which the coating layer is formed, the risk of breakage may increase. Therefore, the laser marking 16 is preferably formed on the rear surface of the optical film 10 on which no coating layer is formed.

Referring to FIG. 5, the marking unit 300 forms markings 16 by irradiating a marking area 15, which is both edges of an effective area 11 formed in the center of the film 10 with respect to the longitudinal direction, with a light source L. be able to.

The film 10 consists of an effective area 11 and a marking area 15. In this specification, the effective area 11 means an area on one side of the film 10 that adheres to the display panel. The effective area 11 is formed on the film 10 along the first direction (vertical direction in FIG. 5).

The effective area 11 is formed to have a predetermined width based on the longitudinal center of the film 10 . That is, it is a region formed in the central portion in the width direction of the film 10 .

In this specification, the 'marking area 15' is an area on one surface of the film 10 excluding the effective area 11, which is an area to be adhered to the display panel, on the film 10 in the first direction (vertical direction in FIG. 5). formed along.

The marking areas 15 are formed on both sides of the effective area 11, that is, on the peripheral edge of the film 10, with the center of the film 10 in the longitudinal direction (vertical direction in FIG. 5) as a reference.

The marking unit 300 according to the first embodiment of the present invention is arranged above the marking area 15 (reference in FIG. 2), receives power from the driving unit 400 described later, and the formation path of the marking 16 and the irradiation angle of the light source L are Adjustable.

A plurality of marking units 300 are provided and arranged in the marking areas 15 formed on both sides of the effective area 11 .

As a result, the markings 16 are formed in the marking areas 15 formed on both sides of the effective area 11 of the film 10 . Additionally, the width of the effective area 11 can be determined by the spacing between each marking 16 formed in the marking area 15 .

The driving unit 400 is connected to the marking unit 300 and can move the marking unit 300 . The driving unit 400 transmits power to the marking unit 300 to move the marking unit 300. As the marking unit 300 moves, the marking 16 forms a predetermined angle with the first direction. It is formed.

In this case, the drive section 400 is arranged between the supply section 100 and the reception section 200 and arranged above the film 10 moving between the supply section 100 and the reception section 200 . The driving unit 400 is electrically connected to the marking unit 300 and transmits power to the marking unit 300 to control the irradiation path and angle of the marking unit 300 .

In this case, in the present invention, an example in which the marking unit 300 is moved by the driving unit 400 (Gun type laser) has been illustrated and described, but the present invention is not limited thereto. That is, the marking unit 300 itself can be modified to form the marking 16 by irradiating a laser beam at a desired angle using an optical method (scanner type laser).

6A to 6C, the moving direction of the film 10 is the first direction, that is, from the bottom to the top (reference to FIG. 6A), and the marking 16 formed by the light source L emitted from the marking unit 300. is formed at a predetermined angle with the first direction.

Specifically, in FIG. 6A, the markings 16 are formed in the same direction as the machine direction (MD) of the film 10, and the formation path of the markings 16 and the first direction are 0°. It is formed.

In this case, since the formation path of the marking 16 and the first direction are 0°, the height h1 of the left protrusion 17 and the height h2 of the right protrusion 17 formed on both sides of the marking 16 are equal. be done.

The marking 16 forms a predetermined angle .theta.1 with the first direction (reference vertical direction in FIG. 6B), which is the direction of movement of the film 10. More specifically, the marking 16 forms an angle of 15.degree. with the first direction.

Referring to FIG. 6B, since the formation path of the marking 16 and the first direction form an angle of 15°, the height h2 of the right protrusion 17 is greater than the height h1 of the left protrusion 17 formed on both sides of the marking 16 . is relatively high.

In FIG. 6C, the marking 16 forms a predetermined angle θ2 with the first direction (reference vertical direction in FIG. 6C), which is the direction of movement of the film 10, and more specifically, forms an angle of 30° with the first direction. be.

In this case, since the formation path of the marking 16 forms an angle of 30° with the first direction, the height h2 of the right protrusion 17 formed on both sides of the marking 16 is relative to the height h1 of the left protrusion 17. formed high at

The height h2 of the right protrusion 17 in FIG. 6C is formed higher than the height h2 of the right protrusion 17 in FIG. 6B, and the height h1 of the left protrusion 17 is higher than the height of the left protrusion 17 in FIG. 6B. is also formed low.

In the case of the optical film 10 used as a material for a display, it is generally stretched and used, so it is subject to tensile strength, elongation, and heat resistance along the axial direction, specifically the first direction. Different degrees of absorption/conduction, volume expansion, etc. may occur.

Therefore, the height of the protrusion 17 should be adjusted according to the physical properties of the film 10, and the formation path of the marking 16 should form a predetermined angle with the first direction, which is the feeding direction of the film 10. need to be

The driving part 400 is formed to transmit power to the marking part 300 so that the marking part 300 forms a predetermined angle, specifically 0° to 180°, with respect to the first direction.

The driving unit 400 is connected to the marking unit 300, the marking unit 300 moves on the driving unit 400, and the irradiation path and angle of the light source L can be adjusted.

The marking unit 300 is movable in a predetermined direction (horizontal direction in FIG. 2) on the driving unit 400 . However, it is not limited to this, and various modifications such as being able to move in the horizontal direction with reference to FIG. 5 are possible.

Although not shown, the angle at which the illumination of the light source L from the marking unit 300 is incident on one surface of the film 10 (upper surface in FIG. 2) can also be adjusted.

As a result, the irradiation of the light source L from the marking unit 300 forms the marking 16 on the marking area 15 of the film 10. At this time, the height h1 of the left protrusion 17 formed on both sides of the marking 16 and the right protrusion 17 and the height h2 are equal (0°, 180°) or different from each other (0° and less than 180°).

7, a graph showing the height of the protrusion 17 according to the angle between the marking 16 and the first direction (reference vertical direction of FIG. 6A). The heights h2 of 17 are made equal or different.

Accordingly, the marking 16 having the optimum height of the projection 17 is formed at different angles depending on the physical properties of the film 10 with the same output of the laser light source L. Therefore, the driving unit 400 drives the marking unit 300. The path of formation of the marking 16 and the angle with the first direction can be controlled.

Accordingly, it is possible to adjust the formation path of the marking 16 forming a predetermined angle with the first direction so as to correspond to the physical properties of the film 10, and the thickness of the film 10 at the optimum height of the protrusion 17 can be adjusted. It is possible to increase the surface pressure distribution due to the deviation, prevent the interface between the films 10 from being completely adhered during winding, and draw in air to increase the slip resistance.

By increasing the slip resistance, it is possible to prevent meandering during winding, and air is drawn in between the interfaces of the laminated film 10, thereby suppressing pressing defects that occur during winding. It has the effect of being able to

Hereinafter, the operating principle of the apparatus for manufacturing an optical film using marking and the method for manufacturing an optical film according to the first embodiment of the present invention will be described. FIG. 8 is a flow chart showing a method for manufacturing an optical film according to the first embodiment of the invention.

Referring to FIG. 8, the method for manufacturing an optical film according to the first embodiment of the present invention includes step S10 of supplying an optical film, step S20 of adjusting an angle to determine a marking formation path, and irradiation with a light source. and forming the markings S30, and winding the optical film S40.

In step S10 of supplying the optical film, the optical film 10 is supplied from the supply unit 100 in the first direction (from the left side to the right side in FIG. 2).

The supply unit 100 can rotate clockwise or counterclockwise by receiving power from the outside. Referring to FIG. 2, the supply unit 100 rotates clockwise to move the film 10 rightward (reference to FIG. 2). can be done.

In step S<b>20 of determining the marking formation path, the marking part 300 arranged above the optical film 10 may be adjusted to determine the formation path of the marking 16 .

The marking unit 300 is arranged between the supplying unit 100 and the receiving unit 200, and receives power from a driving unit 400 arranged above the film 10 (reference in FIG. 2) to determine the formation path of the markings 16. can.

Here, the formation path of the marking 16 means not only the marking 16 but also the formation path of the protruding portion 17 formed along both sides of the marking 16 formed in a groove shape. .

That is, when the marking 16 is formed, the projections 17 having predetermined heights h1 and h2 are formed on the left and right sides of the marking 16 along the longitudinal direction of the marking 16, respectively.

The driving unit 400 can move and rotate the marking unit 300 to determine the formation path of the marking 16 (see FIG. 1).

Specifically, referring to FIGS. 6A to 6C, the first direction (reference vertical direction in FIG. 6A), which is the feeding direction of the film 10, and the marking 16 form a predetermined angle. Part 300 can be moved and rotated.

Although not shown, the driving unit 400 may include a control unit (not shown) electrically connected to the marking unit 300 and receiving an electric signal from the driving unit 400 to control driving of the marking unit 300 .

6A shows a 0° angle between the first direction and the formation path of the markings 16, FIG. 6B shows a 15° angle between the first direction and the formation path of the markings 16, and FIG. FIG. 4 is a diagram showing a state where the first direction and the formation path of the marking 16 form an angle of 30°;

However, the present invention is not limited to this, and the formation path of the marking 16 is formed at a predetermined angle within the range of 0° to 180° with the first direction (vertical direction in FIG. 6A). It is possible to implement various modifications such as

In step S30 of forming the marking, the marking 16 is formed by irradiating the optical film 10 with the light source L from the marking section 300 . In the step S30 of forming the marking, the light source L can illuminate along the path determined in the step S20 of determining the forming path of the marking.

6A to 6C, the marking 16 is formed at a predetermined angle with respect to the feeding direction of the film 10 (vertical direction in FIG. 6A).

4, 6B, and 6C, the marking 16 is formed at a predetermined angle with respect to the first direction, and left and right protrusions 17 protrude on both sides of the marking 16. As shown in FIG. S h1 and h2 are formed differently.

As a result, physical properties such as tensile strength, heat absorption/conduction, volume expansion, etc. are formed differently along the axial direction (vertical direction in FIG. 5) of the stretched film 10, thereby increasing surface pressure and slip resistance. Considering that the optimum heights of the protrusions 17 are different, there is an effect that the heights of the protrusions 17 can be formed differently depending on the film 10 .

In step S40 of winding the optical film, the receiving unit 200, which is spaced apart from the supplying unit 100, receives power from the outside and rotates clockwise (reference to FIG. A film 10 on which markings 16 forming a predetermined angle with respect to the 6A reference vertical direction) is wound.

In this case, the protrusions 17 on both sides of the markings 16 formed in the marking areas 15 on the film 10 increase surface energy, friction coefficient, and slip resistance, thereby preventing meandering during winding of the film 10. It has the effect of being able to

In addition to this, there is an effect that the pressing failure caused by the winding core fixing tape can be eliminated by drawing air between the plurality of films 10 laminated at the time of winding.

In addition to this, the projections 17 formed on both sides of the marking 16, specifically, the left side, are formed by forming a predetermined angle between the marking 16 and the first direction, which is the feeding direction of the film 10. The height h1 of the protrusion 17 is different from the height h2 of the right protrusion 17, and the physical properties are generally different along the axial direction (vertical direction in FIG. 5) of the stretched film 10. When this is taken into consideration, there is an effect that the optimum marking 16 and projection 17 can be formed by reflecting this.

Meanwhile, referring to FIGS. 9 and 10, the optical film manufacturing apparatus 1' according to the second embodiment of the present invention includes a supply unit 100, a receiving unit 200, a coating unit 500, and a marking unit 300. be able to.

A supply unit 100 and a receiving unit 200 according to the second embodiment of the present invention are configured in the same manner as the optical film manufacturing apparatus 1 according to the first embodiment.

The optical film 10 moves from the supply unit 100 to the reception unit 200 along the first direction, and the coating unit 500, which will be described later, coats or uncoates one surface of the film 10 (reference top surface in FIG. 10). A marking 16 is formed by the marking portion 300 on the other surface (reference lower surface in FIG. 10) opposite to the one surface of the film 10 facing the film 10 .

The coating part 500 is disposed between the supply part 100 and the receiving part 200, and can form a coating layer CL on one surface of the optical film 10 (reference top surface in FIG. 10).

Specifically, the coating unit 500 may form the coating layer CL on the upper surface of the optical film 10 moving in the first direction through solution coating→curing→drying processes.

A coating liquid flows out from the coating unit 500 onto the film 10 to perform surface treatment. Specifically, the film 10 is made of PET (polyethylene terephthalate).

The coating layer CL is an ASG (Anti-Semi-Glare) coating layer CL, and is made of microparticles, UV-cured resin, and fluorine-based additives.

A coating layer CL is formed on the film 10 by the coating part 500, and hardness can be increased compared to the film 10 in which the coating layer CL is not formed.

The coating part 500 is arranged in a direction perpendicular to the longitudinal direction of the film 10 (horizontal direction in FIG. 12).

Referring to FIG. 12, the film 10 consists of an effective area 11 and a marking area 15. In this specification, the "effective area 11" means an area attached to the display panel on one side of the film 10. . The effective area 11 is formed on the film 10 along a first direction (vertical direction in FIG. 12).

The effective area 11 is formed to have a predetermined width set in advance with the center of the film 10 in the longitudinal direction (vertical direction) as a reference. That is, it is a region formed in the central portion in the width direction of the film 10 .

In the present specification, the 'marking area 15' is formed on the film 10 along the first direction in one surface of the film 10 excluding the effective area 11, which is the area attached to the display panel.

The marking areas 15 are formed on both sides of the effective area 11 with the center of the film 10 in the longitudinal direction (vertical direction) as a reference, that is, on the periphery of the film 10 .

The film 10, more specifically, a marking portion 300, which will be described later, is arranged on the lower side of the marking area 15, and a coating portion 500 is arranged on the upper side. The coating unit 500 can form the coating layer CL on a predetermined area of the effective area 11 of the film 10 .

The marking part 300 is arranged on the other side (the lower side in FIG. 9) opposite to one side (the upper side in FIG. 9) of the film 10 where the coating part 500 is located. can be formed.

Referring to FIG. 13, the coating part 500 is arranged so as not to overlap the marking part 300 in a direction perpendicular to the first direction.

That is, in a predetermined section of the film 10, the ASG coating layer CL is formed on one surface (upper surface in FIG. 9) and the other surface (upper and lower in FIG. 10) corresponding to the vertical direction (upper and lower in FIG. 10). The marking 16 is not formed on the lower surface as a reference).

By not arranging the ASG coating layer CL and the markings 16 in the overlapping region in the direction perpendicular to the first direction of the film 10, it is possible to prevent breakage during winding of the film 10 compared to overlapping.

That is, when the ASG coating layer CL is formed on the film 10 and has a high hardness due to UV curing, and the marking 16 is formed by irradiating the marking part 300 with the light source L on the other side corresponding to this, A groove of marking 16 is formed.

Although the depth of the grooves of the markings 16 increases the risk of breaking the film 10, the risk of breaking can be reduced by not overlapping the markings 16 and the coating layer CL in the direction perpendicular to the first direction. .

In addition, the protrusions 17 formed on both sides of the marking 16 increase the surface energy, improve the slip resistance, and prevent meandering of the film 10 during winding.

The marking unit 300 is spaced apart from the coating unit 500 with the optical film 10 interposed therebetween, and forms markings 16 by irradiating the other surface of the optical film 10 on which the coating layer CL is formed with the light source L. be able to.

In the present invention, the light source L is a laser, and by irradiating the film 10 with the light source L, a marking 16 having a groove shape is formed in a preset predetermined section, and a section in which the marking 16 is formed. , protrusions 17 are formed along both sides of the marking 16 in the outward direction (the lower side in FIG. 11).

The protrusion 17 may protrude downward from the lower surface of the film 10 and have a constant height. Referring to FIG. 11 , the protrusion 17 can serve as a guide so that the film 10 does not tilt to one side while being received by the receiving part 200 .

Although not shown, the projecting portion 17 is formed on the lower surface of the film 10 , and the film 10 is stacked in the centrifugal direction with the center of the receiving portion 200 as a reference while being wound by the receiving portion 200 . At this time, the protrusion 17 comes into contact with the upper surface of the film 10 already wound inside the protrusion 17, so that the contact pressure increases and the slip resistance increases.

In addition to this, when the film 10 forms layers and is stacked on the receiving part 200, there is an effect that the intervals between the layers can be kept constant.

In addition, it is possible to prevent the film 10 from being damaged or broken due to the pressing pressure of the film 10 arranged on the upper side when an unexpected foreign substance is introduced in the manufacturing process of the optical film 10 . There is an effect that the surface pressure in the winding core direction can be increased as the height of the projecting portion 17 increases.

11 and 12, the marking portion 300 increases the surface energy of the film 10, specifically, the protrusions 17 formed in the marking area 15, thereby increasing the slip resistance of the film 10. There is an effect that it is possible to prevent meandering due to slippage during winding.

The marking part 300 can form the markings 16 in the marking areas 15, which are both side edges of the effective area 11 formed in the center of the film 10 with respect to the longitudinal direction.

The markings 16 are formed on the other surface of the film 10 facing the upper surface of the film 10 on which the coating layer CL is formed, and are formed so as not to overlap in a direction perpendicular to the longitudinal direction of the film 10 .

As a result, even if the marking 16 is formed in a groove shape, it does not correspond to the position of the coating layer CL, so that the projecting portion 17 is formed on the other surface corresponding to the region where the hardness is increased by the UV-cured coating layer CL. As compared to others, the possibility of film 10 breaking during winding can be reduced, and the protrusions 17 can increase surface energy and slip resistance to reduce the occurrence of meandering during winding.

Referring to FIG. 12 , a plurality of marking parts 300 are provided and arranged in marking areas 15 formed on both sides of the effective area 11 . As a result, the markings 16 are formed in the marking areas 15 formed on both sides of the effective area 11 of the film 10 .

The width of the effective area 11 can be determined by the spacing between the markings 16 formed in the marking area 15, thereby increasing the area in which the coating layer CL is formed.

Hereinafter, the operation principle of the optical film manufacturing apparatus and the optical film manufacturing method according to the second embodiment of the present invention will be described. FIG. 14 is a flow chart showing a method for manufacturing an optical film according to the second embodiment of the invention.

9 to 14, the method for manufacturing an optical film according to the second embodiment of the present invention includes step S10 of providing an optical film, step S20 of forming a coating layer, and step S30 of forming a marking. , and a step S40 of winding the optical film.

In step S10 of supplying the optical film, the optical film 10 is supplied from the supply unit 100 in the first direction (from the left side to the right side in FIG. 10). The supply unit 100 can rotate clockwise or counterclockwise by receiving power from the outside, and can move the film 10 rightward (reference to FIG. 10) by rotating clockwise.

In the coating layer forming step S20, the coating layer CL is formed on one surface of the optical film 10, and the ASG coating layer CL is formed, but is not limited thereto, and various functional coating layers may be used. Of course, it may also be formed.

12 and 13, the coating layer CL is formed on one surface (reference top surface of FIG. 13) of the film 10 and on the effective area 11 of the film 10. As shown in FIG.

The coating layer CL is formed so as not to overlap the markings 16 formed in step S30 of forming markings, which will be described later, in a direction perpendicular to the first direction of the film 10 .

That is, the marking 16 is not formed on the lower surface of the film 10 corresponding to the upper surface of the film 10 on which the coating layer CL is formed, and the coating layer CL is formed on the upper surface of the film 10 corresponding to the lower surface of the film 10 on which the marking 16 is formed. CL is not formed.

Referring to FIGS. 15A and 15B, the film CL with the coating layer and the film NCL without the coating layer were heat-treated at a glass transition temperature (Tg) and a melting temperature (Tm). Later, the surface energy was measured, and it was found that the surface energy of the film CL with the coating layer was much lower than that of the film NCL without the coating layer at room temperature. Since the surface energy of the film 10 is reduced after coating, the slip resistance is lowered and the possibility of meandering during winding is increased.

On the other hand, the surface energy of the film NCL, in which no coating layer is formed after heat treatment near the melting temperature, increases compared to room temperature. Resistance is increased, and the possibility of occurrence of meandering can be suppressed.

16A and 16B, the film having the coating layer formed thereon was heat-treated near the glass transition temperature (Tg) and the melting temperature (Tm), and then the coefficient of friction (COF) was measured. 16A is a measurement of the friction coefficient of the film CL with the coating layer formed thereon, and FIG. 16B is a measurement of the friction coefficient of the film NCL without the coating layer formed thereon.

Specifically, referring to FIGS. 16A and 16B, the interfacial friction force between the film surfaces was measured with a friction coefficient measuring device at a load of 200 g (Case 1) and 700 g (Case 2). , the surface friction force is much lower than that of the film NCL in which no coating layer is formed even after heat treatment at the melting temperature (Tm).

A low surface friction force means that it is weak against slip resistance, and means that there is a high possibility that meandering will occur during winding.

In the marking forming step S30, the marking 16 can be formed by irradiating the optical film 10 with the light source L from the marking unit 300 disposed outside the optical film 10 (the lower side of the reference in FIG. 10).

The marking unit 300 irradiates the lower surface of the film 10 corresponding to the region where the coating layer CL is not formed on the upper surface of the film 10 along the direction perpendicular to the first direction, which is the longitudinal direction of the film 10, with a light source L, that is, a laser. marking 16 can be formed.

By forming the markings 16 in a groove shape, protrusions 17 are formed on both sides of the markings 16, and the formation of the protrusions 17 increases the surface energy, the friction coefficient, and the slip resistance, thereby improving the winding performance. There is an effect that it is possible to prevent meandering from occurring in some cases.

In addition to this, the coating layer CL is not formed on the upper side of the area where the marking 16 is formed, and the coating layer CL and the marking 16 do not overlap. In addition to reducing the surface energy, the increased risk of fracture due to the depth of the groove-shaped markings 16 can be prevented.

In step S40 of winding the optical film, the receiving section 200 spaced apart from the supplying section 100 receives power from the outside and rotates clockwise to form the coating layer CL and the film 10 having the markings 16 formed thereon is wound. be taken.

In the marking forming step S30, the protrusions 17 on both sides of the marking 16 formed in the marking area 15 on the film 10 increase surface energy, friction coefficient, and slip resistance, and meandering occurs when the film 10 is wound. There is an effect that it is possible to prevent

A coating layer CL is formed on one surface of the film 10 manufactured by the optical film manufacturing apparatus 1 and the manufacturing method according to the present invention, and a marking 16 is formed on the other surface opposite to the one surface. The system number and slip resistance are increased, and meandering during winding can be prevented.

Moreover, since the coating layer CL and the markings 16 do not overlap in the direction perpendicular to the longitudinal direction of the film 10, there is an effect that the possibility of breakage of the film 10 during winding can be reduced.

Although the present invention has been illustrated and described above with reference to specific specific embodiments, the present invention is of course not limited to the above embodiments, and various modifications can be made without departing from the technical idea of the present invention. and can be modified.

1: Optical film manufacturing apparatus L: Light source 10: Optical film 11: Effective area 15: Marking area 16: Marking 17: Protruding part 100: Supply part 200: Receiving part 300: Marking part 400: Driving part 500: Coating part

Claims (14)

a supply unit that supplies the optical film in a first direction;
a receiving unit spaced apart from the supply unit for winding the optical film supplied from the supply unit;
a marking unit disposed between the supply unit and the reception unit for forming a marking by irradiating the optical film with a light source;
a coating unit that forms a coating layer on one surface of the optical film between the supply unit and the reception unit ;
The marking unit is spaced apart from the coating unit with the optical film interposed therebetween, and forms a marking on the other surface of the optical film,
the coating layer is formed on a first region formed on one surface of the optical film;
the marking is formed in a second region formed on the other surface of the optical film opposite to the surface on which the coating layer is formed;
The apparatus for manufacturing an optical film , wherein the first area and the second area do not overlap in a direction perpendicular to the first direction . further comprising a driving unit connected to the marking unit to move the marking unit;
The apparatus of claim 1, wherein the marking is formed at a predetermined angle with respect to the first direction as the marking unit moves. 3. The apparatus for manufacturing an optical film according to claim 2, wherein the optical film is formed with protrusions along both sides of the marking. 4. The apparatus for manufacturing an optical film according to claim 3, wherein the protrusions formed on both sides of the marking have different heights in the direction of protrusion. 3. The optical film manufacturing apparatus according to claim 2, wherein the optical film includes a marking area and an effective area, and the marking is formed in a predetermined section of the marking area. The effective area is formed in a central portion along the longitudinal direction of the optical film,
6. The apparatus for manufacturing an optical film according to claim 5, wherein the marking areas are formed on the periphery of the optical film so as to be arranged on both sides of the effective area. 7. The optical film manufacturing apparatus according to claim 6, wherein a plurality of said marking units are provided in said marking area. 3. The apparatus of claim 2, wherein the marking forms an angle of 0° to 180° with the first direction. supplying an optical film along a first direction from a supply unit;
forming a coating layer on one side of the optical film;
determining a marking formation path by adjusting a marking portion disposed outside the optical film;
irradiating the optical film from the marking unit with a light source to form a marking;
winding the optical film on which the marking is formed by a receiving unit spaced apart from the supplying unit ;
the marking is formed on the other surface of the optical film having a coating layer formed on one surface;
the coating layer is formed on a first region formed on one surface of the optical film;
the marking is formed in a second region formed on the other surface of the optical film opposite to the surface on which the coating layer is formed;
The method for producing an optical film , wherein the first region and the second region do not overlap in a direction perpendicular to the first direction . The method of manufacturing an optical film according to claim 9 , wherein the marking is formed to form a preset angle with respect to the first direction. 10. The method of manufacturing an optical film according to claim 9 , wherein the optical film is formed with protrusions along both sides of the marking. 12. The method of manufacturing an optical film according to claim 11 , wherein the protrusions formed on both sides of the marking have different heights in the direction of protrusion. The marking is formed in a groove shape,
10. The method for producing an optical film according to claim 9 , wherein the groove depth of the marking is formed at a ratio of 0.5 to 5 when the total thickness of the optical film is 10. 10. The production of the optical film according to claim 9 , wherein the height of the protrusions formed on both sides of the marking is formed at a ratio of 0.5 to 10 when the total thickness of the optical film is 10. How .

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