KR102577529B1 - Method for manufacturing anti-glare sheet using emborol and emborol for manufacturing anti-glare sheet - Google Patents

Abstract

The present invention relates to a method of manufacturing an anti-glare sheet using an ember roll and an emver roll for manufacturing an anti-glare sheet. More specifically, the emver roll for manufacturing an anti-glare sheet can reduce glare by scattering light incident at various angles. It is characterized by relating to a method of manufacturing an anti-glare sheet and an ember roll for manufacturing an anti-glare sheet.

Description

Method for manufacturing anti-glare sheet using emborol and emborol for manufacturing anti-glare sheet {Method for manufacturing anti-glare sheet using emborol and emborol for manufacturing anti-glare sheet}

The present invention relates to a method of manufacturing an anti-glare sheet using an ember roll and an emver roll for manufacturing an anti-glare sheet. More specifically, the emver roll for manufacturing an anti-glare sheet can reduce glare by scattering light incident at various angles. It is characterized by relating to an emver roll used in the manufacture of an anti-glare sheet and a method of manufacturing an anti-glare sheet using an ember roll.

Recently, interest in the image quality of displays in smart devices such as smartphones or tablet PCs has continued to increase, and interest in sheets used for expensive picture frames in art exhibition halls and museums is also increasing.

In particular, since mobile terminals or picture frames are used in various external light conditions, when outdoor sunlight or indoor lighting is reflected on the surface of the display sheet or sheet used in the picture frame, it is difficult to see the original screen video, picture, or photo properly. Problems arise that make it impossible for many people to view paintings, photos, etc. at the same time in art exhibition halls, museums, etc.

Therefore, there is a need to develop technology that can improve visibility through the sheet by reducing the regular reflection of various types of external light occurring on the sheet surface.

Accordingly, in Korean Patent Publication No. 10-2020-0054541, the ultraviolet curable resin 220 of the sheet 240 coated with the ultraviolet curable resin 220 is cured into the concave bead layer 221 so as to contact the concave bead layer 221. After laminating the sheet 230 and the sheet 240 coated with ultraviolet curing resin 220, they are irradiated with ultraviolet rays (S4), and then the sheet 230 cured with the engraved bead layer 221 is separated and imprinted. A manufacturing method for obtaining an anti-reflective sheet 240 (S5) is disclosed, but a method of manufacturing an anti-glare sheet using an emver roll and an emver roll for manufacturing an anti-glare sheet are not described.

Accordingly, while researching to solve the above problems, the present inventors developed a method for manufacturing anti-glare sheets using emver rolls and an emver roll for manufacturing anti-glare sheets. Ember rolls for manufacturing anti-glare sheets are used in manufacturing anti-glare sheets. Anti-glare sheets manufactured using an anti-glare sheet manufacturing method using ember roll have less glare caused by incident light, and the anti-glare sheets allow you to clearly see original images such as photos, pictures, and contents of smart devices. The present invention was completed by discovering what could be done.

The present invention was devised to solve the problems of the prior art described above, and its purpose is to provide a method of manufacturing an anti-glare sheet using an amber roll and an amber roll for manufacturing an anti-glare sheet.

As a technical means to achieve the above-mentioned technical tasks,

One aspect of the present invention includes a first input step of injecting a molten sheet resin between a rotating first roll 11 and a rotating second roll 12; And a second input step in which the sheet resin that has passed the first input step is in close contact with the second roll (12) and passes between the second roll (12) and the rotating third roll (13), It provides a method of manufacturing an anti-glare sheet using an amber roll, wherein one selected from the group consisting of the second roll (12) and the third roll (13) is an amber roll.

The rotation direction of the first roll 11 and the third roll 13 may be the same, and the rotation direction of the second roll 12 may be opposite to the rotation direction of the first roll 11.

The temperature of the first roll 11 may be higher than the temperature of the second roll 12, and the temperature of the third roll 13 may be higher than the temperature of the first roll 11.

The temperature of the first roll 11 may be lower than the temperature of the second roll 12, and the temperature of the third roll 13 may be lower than the temperature of the second roll 12.

이고, 상기 제2롤(12)의 온도가 55~95

이고, 상기 제3롤(13)의 온도가 100~145

인 것일 수 있다.When the third roll (13) is an emboss roll, the temperature of the first roll (11) is 60 to 105 degrees Celsius.

and the temperature of the second roll 12 is 55 to 95

and the temperature of the third roll 13 is 100 to 145

It may be.

이고, 상기 제2롤(12)의 온도가 100~140

이고, 상기 제3롤(13)의 온도가 90~130

인 것일 수 있다.When the second roll 12 is an emboss roll, the temperature of the first roll 11 is 70 to 110 degrees Celsius.

and the temperature of the second roll 12 is 100 to 140

and the temperature of the third roll 13 is 90 to 130

It may be.

When the amber roll is the second roll 12, the thickness of the sheet that has gone through the second input step may be 1.0 to 2.5 mm.

When the amber roll is the third roll 13, the thickness of the sheet that has gone through the second input step may be 2.5 to 4.5 mm.

The rotational speed of the first roll 11, the second roll 12, and the third roll 13 may be 0.8 m/min to 3.0 m/min.

Irregularities are formed on the surface of the emver roll,

The arithmetic average roughness (Ra) of the surface of the emver roll may be 2.5 to 4.5 ㎛, and the 10-point average roughness (Rz) may be 10 to 25 ㎛.

The peak water roughness (Rpc) of the amber roll may be 80 to 110.

The transfer rate of the emver roll to sheets may be 5 to 20%.

The transfer rate of the emver roll for manufacturing the anti-glare sheet to the sheet may be 5 to 20%.

Another aspect of the present invention provides an anti-glare sheet manufactured by the anti-glare sheet manufacturing method using the emver roll of claim 1.

Another aspect of the present invention is that irregularities are formed on the surface of the roll,

An arithmetic average roughness (Ra) of the roll surface is 2.5 to 4.5 ㎛ and a 10-point average roughness (Rz) is 10 to 28 ㎛.

The peak water illuminance (Rpc) of the emver roll for manufacturing the anti-glare sheet may be 80 to 110.

Ember roll for manufacturing an anti-glare sheet according to the present invention as described above is used to manufacture an anti-glare sheet, and the anti-glare sheet manufactured by the method of manufacturing an anti-glare sheet using an anti-glare sheet generates less glare due to incident light, and the glare is reduced. The prevention sheet can have the effect of allowing original images such as photos, pictures, and content from smart devices to be viewed clearly.

Figure 1 is a schematic diagram showing an apparatus 100 for manufacturing an anti-glare sheet according to an embodiment of the present invention.
Figure 2 is a photograph magnified 500 times of the surface of the emver roll for manufacturing an anti-glare sheet according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail. However, the present invention can be implemented in various different forms, and the present invention is not limited to the embodiments described herein, and the present invention is only defined by the claims to be described later.

In addition, the terms used in the present invention are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In the entire specification of the present invention, 'including' a certain element means that other elements may be further included rather than excluding other elements, unless specifically stated to the contrary.

The first aspect of the present application is,

A first input step of injecting the molten sheet resin between the rotating first roll (11) and the rotating second roll (12); And a second input step in which the sheet resin that has passed the first input step is in close contact with the second roll (12) and passes between the second roll (12) and the rotating third roll (13), It provides a method of manufacturing an anti-glare sheet using an amber roll, wherein one selected from the group consisting of the second roll (12) and the third roll (13) is an amber roll.

Hereinafter, the method of manufacturing an anti-glare sheet using the emver roll according to the first aspect of the present application will be described in detail with reference to FIG. 1. At this time, FIG. 1 is a schematic diagram showing an apparatus 100 for manufacturing a light diffusion sheet according to an embodiment of the present invention.

In one embodiment of the present application, by performing a first input step of injecting the sheet resin 10 in a molten state between the rotating first roll 11 and the rotating second roll 12, the molten state of the sheet resin 10 is performed. The sheet resin 10 can be cooled and compressed to have a sheet shape.

Additionally, the rotation direction of the first roll 11 and the third roll 13 may be the same, and the rotation direction of the second roll 12 may be opposite to the rotation direction of the first roll 11. By reversing the rotation direction of the first roll 11 and the second roll 12, the molten sheet resin 10 is introduced between the first roll 11 and the second roll 12. It can be easy, and compression of the sheet resin 10 in the molten state can be easy.

Additionally, one selected from the group consisting of the second roll 12 and the third roll 13 may be an emver roll, which may create irregularities on the sheet.

In one preferred example of the present invention, the temperature of the first roll 11 is higher than the temperature of the second roll 12, and the temperature of the third roll 13 is higher than the temperature of the first roll 11. It can be higher. The temperature of the first roll 11 is higher than the temperature of the second roll 12, and the temperature of the third roll 13 is higher than the temperature of the first roll 11, so that the third roll 13 ) is an emboss roll, unevenness can be easily formed on the sheet. Preferably, when the third roll 13 is an emboss roll, the temperature of the first roll 11 is 60 to 105 ° C., the temperature of the second roll 12 is 55 to 95 ° C., and the third roll 13 is an embroidered roll. The temperature of the roll 13 may be 100 to 145 °C.

In addition, the temperature of the first roll 11 may be lower than the temperature of the second roll 12, and the temperature of the third roll 13 may be lower than the temperature of the second roll 12. The temperature of the first roll 11 is lower than the temperature of the second roll 12, and the temperature of the third roll 13 is lower than the temperature of the second roll 12, so that the second roll 12 ) is an emboss roll, unevenness can be easily formed on the sheet. Preferably, when the second roll 12 is an emboss roll, the temperature of the first roll 11 is 70 to 110 ° C., the temperature of the second roll 12 is 100 to 140 ° C., and the third roll 12 is an embroidered roll. The temperature of the roll 13 may be 90 to 130 °C.

Additionally, when the embroidered roll is the second roll 12, the thickness of the sheet that has gone through the second input step may be 1.0 to 2.5 mm. If the thickness of the sheet that has gone through the second input step is 1.0 to 2.5 mm, the sheet may be a sheet used for a display screen with a 60° glossiness of 55 to 70 GU.

Additionally, when the emver roll is the third roll 13, the thickness of the sheet that has gone through the second input step may be 2.5 to 4.5 mm. If the thickness of the sheet that has gone through the second input step is 2.5 to 4.5 mm, the sheet may be a sheet used for a picture frame with a 60° glossiness of 40 to 55 GU.

Additionally, the rotational speed of the first roll 11, the second roll 12, and the third roll 13 may be 0.8 m/min to 3.0 m/min. If the rotational speed of the first roll (11), the second roll (12), and the third roll (13) is outside the above range, the first roll (11), the second roll (12), and the third roll (13) ) may deviate from the target thickness of the sheet manufactured. Specifically, when the rotational speed of the first roll (11), the second roll (12), and the third roll (13) is less than 0.8 m/min, the first roll (11), the second roll (12), and the third roll (13) The thickness of the sheet manufactured by passing through the 3 rolls (13) may be less than 1.0 mm, and if it is greater than 3.0 m/min, the first roll (11), the second roll (12), and the third roll (13) may be used. The thickness of the sheet produced through passage may be greater than 4.5 mm.

Irregularities may be formed on the surface of the emver roll, the arithmetic average roughness (Ra) of the surface of the emver roll may be 2.5 to 4.5 ㎛, and the 10-point average roughness (Rz) may be 10 to 25 ㎛. Additionally, the peak water roughness (Rpc) of the third roll 13 may be 75 to 95. By forming irregularities on the surface of the emver roll, irregularities can be formed on the sheet, and the arithmetic average roughness (Ra) of the surface of the emver roll is 2.5 to 4.5 ㎛, so that the arithmetic average roughness (Ra) of one surface of the sheet manufactured is By forming it at 0.25~0.60 ㎛, the diffused reflection of light incident on the sheet can be maximized, thereby maximizing glare when viewing photos, pictures, or display contents through the sheet. The arithmetic average roughness (Ra) is the average roughness of the surface, and when a certain length is determined and a straight line parallel to the average cross-sectional curve is drawn within that length, the straight line at which the area surrounded by this straight line and the cross-sectional curve is equal is set as the baseline, and the determined length is The absolute value of the difference between the heights of the patterns and the reference line can be obtained by integrating the determined length and dividing it by the determined length.

If the arithmetic average illuminance (Ra) is less than 0.25 ㎛, the haze may be less than 10, which may cause glare due to light incident on the sheet from the outside, and the glossiness may exceed 100, causing the sheet to be exposed to light incident from the outside. Glare may occur.

If the arithmetic mean illuminance (Ra) is greater than 0.6 ㎛, the haze may exceed 30%, which may lower the transmittance of the sheet when viewing photos, pictures, or content on a display through the sheet.

The 10-point average roughness (Rz) may be the sum of the average height of the five highest peaks and the average depth of the five deepest valleys in the profile within a 4 mm range of the roll surface. The 10-point average roughness (Rz) of the roll surface may be preferably 12 to 25 ㎛, and more preferably 15 to 22 ㎛.

Since the 10-point average roughness (Rz) of the surface of the emver roll is 10 to 25 ㎛, the 60° glossiness of the manufactured sheet can be 40 to 70 GU.

Additionally, the peak water roughness (Rpc) of the amber roll may be 80 to 110. By setting the peak water illuminance (Rpc) of the amber roll to 80 to 110, the diffused reflection of light incident on the sheet can be maximized, thereby maximizing glare when viewing photos, pictures, or display contents through the sheet. . The peak water irradiance (Rpc) refers to the average value of the peak water irradiance (Rpc) of three arbitrary points, and the peak water irradiance (Rpc) of each of the points is according to the steel-iron test schedule (SEP 1940) standard. This is the number of effective peaks rising above the upper baseline of 0.5㎛ per unit sampling length of 4mm in the obtained surface roughness profile. At this time, there is at least one valley deeper than the lower baseline of -0.5㎛ between neighboring effective peaks. If there is no valley deeper than the -0.5㎛ lower baseline between neighboring peaks that rise above the upper baseline, all of the neighboring peaks are “effective peaks” that are used to measure peak water irradiance (Rpc). cannot be, and in calculating the number of “effective peaks,” relatively lower peaks among the above peaks are ignored.

The transfer rate of the emver roll to sheets may be 5 to 20%. The transfer rate may refer to the percentage of the pattern transferred from the roll to the sheet. If the transfer rate is more than %, the blurriness of the anti-glare sheet may be higher than 30%, making it difficult to identify photos, pictures, or display contents through the sheet. If the transfer rate is less than 5%, the glossiness of the anti-glare sheet increases, which may cause glare when identifying photos, pictures, or display content through the sheet. The transfer rate of the embossed roll for manufacturing the anti-glare sheet to the sheet may preferably be less than 10%, and more preferably less than 9%.

The second aspect of the present application is,

An anti-glare sheet manufactured by the anti-glare sheet manufacturing method using the above-mentioned ember roll is provided.

Detailed descriptions of parts that overlap with the first aspect of the present application may be omitted, and contents described with respect to the first aspect of the present application may be equally applied even if the description is omitted in the second aspect.

Hereinafter, the anti-glare sheet according to the second aspect of the present application will be described in detail.

An anti-glare sheet is provided in which irregularities are formed on one surface of the sheet, an arithmetic average roughness (Ra) of one surface of the sheet is 0.25 to 0.60 ㎛, and a peak water illuminance (Rpc) of the sheet is 80 to 110.

Hereinafter, the anti-glare sheet according to the first aspect of the present application will be described in detail.

In one embodiment of the present application, by forming irregularities on one surface of the sheet, diffuse reflection of light incident on the sheet from the outside is induced and the reflected light is scattered, causing glare when viewing a photo, picture, or display content through the sheet. can be prevented.

In addition, by setting the arithmetic mean illuminance (Ra) of one surface of the sheet to 0.25 ~ 0.60 ㎛, the diffuse reflection of light incident on the sheet can be maximized, thereby maximizing glare when viewing photos, pictures, or display contents through the sheet. It can be prevented. The arithmetic average roughness (Ra) is the average roughness of the surface, and when a certain length is determined and a straight line parallel to the average cross-sectional curve is drawn within that length, the straight line at which the area surrounded by this straight line and the cross-sectional curve is equal is set as the baseline, and the above-defined straight line is defined as the baseline. The absolute value of the difference between the heights of the length patterns and the reference line can be obtained by integrating the determined length and dividing it by the determined length.

If the arithmetic average illuminance (Ra) is less than 0.25 ㎛, the haze may be less than 10, which may cause glare due to light incident on the sheet from the outside, and the glossiness may exceed 100, causing the sheet to be exposed to light incident from the outside. Glare may occur.

If the arithmetic mean illuminance (Ra) is greater than 0.60 ㎛, the haze may exceed 30%, which may lower the transmittance of the sheet when viewing photos, pictures, or content on a display through the sheet.

In addition, by setting the peak illuminance (Rpc) to 80 to 110, the diffuse reflection of light incident on the sheet can be maximized, thereby maximizing glare prevention when viewing photos, pictures, or display contents through the sheet. The peak water irradiance (Rpc) refers to the average value of the peak water irradiance (Rpc) of three arbitrary points, and the peak water irradiance (Rpc) of each of the points is according to the steel-iron test schedule (SEP 1940) standard. This is the number of effective peaks rising above the upper baseline of 0.5㎛ per unit sampling length of 4mm in the surface roughness profile obtained according to this. At this time, there is at least one valley deeper than the lower baseline of -0.5㎛ between neighboring effective peaks. If there is no valley deeper than the -0.5㎛ lower baseline between neighboring peaks that rise above the upper baseline, all of the neighboring peaks are “effective peaks” that are used to measure peak water irradiance (Rpc). cannot be, and in calculating the number of “effective peaks,” relatively lower peaks among the above peaks are ignored.

The composition of the sheet may be one or more selected from the group consisting of polymethyl methacrylate, polystyrene, polypropylene, polycarbonate, polyethylene terephthalate, glycol-modified polyethylene terephthalate, and poly(styrene-methyl methacrylate). Preferably, it may be polymethyl methacrylate, polystyrene, polyethylene terephthalate, or glycol-modified polyethylene terephthalate.

Additionally, the sheet may have a thickness of 1.0 to 4.5 mm. Preferably it may be 1.5 to 4.0 mm. If the thickness is less than 1.0 mm, the durability of the sheet may decrease, and if the thickness is greater than 4.5 mm, the transparency of the sheet may decrease.

The haze of the sheet may be 4 to 30%. Preferably it may be 4 to 25. The haze is also called haze, and is defined as the degree to which light incident on a transparent object is scattered. It is defined as the fraction of scattered diffuse transmitted light of ±2.5° or more compared to parallel transmitted light parallel to the incident light. The calculation method is as follows.

Haze(%)= Is / (Is+Ir) *100

Here, Is = intensity of transmitted light above 2.5° (=diffuse transmitted light intensity)

Ir = intensity of transmitted light within 2.5° (=parallel transmitted light intensity)

If the haze is lower than 4%, glare may occur, and if it is higher than 30%, the transmittance of the sheet is lowered, making it difficult to identify photos, pictures, or display contents through the sheet. Specifically, in the case of a sheet covering a display screen, the blurriness may be 4 to 10%, and in the case of a sheet covering a picture frame, the blurriness may be 10 to 30.

Additionally, the sheet may have a transmittance of 80% or more. If the transmittance is less than 80%, it may be difficult to identify photos, pictures, or content of the display through the sheet. Specifically, the sheet covering the display screen may have a transmittance of 80 to 90%, and the sheet covering the picture frame may have a transmittance of 90% or more.

Additionally, the 60° glossiness of the sheet may be 40 to 70 GU. The gloss can be defined as the intensity of reflected light depending on the angle based on the glass surface with a refractive index of 1.567. If the 60° glossiness of the sheet exceeds 70 GU, glare may occur when viewing the content of a photo, picture, or display through the sheet at an angle of 60°, and if it is less than 40 GU, the content of the photo, picture, or display may appear through the sheet. Discrimination may be difficult when viewing content from a 60° angle. Specifically, in the case of a sheet covering a display screen, the sheet 60° glossiness may be 55 to 70 GU, and in the case of a sheet covering a picture frame, the sheet 60° glossiness may be 40 to 55 GU.

Additionally, the 20° glossiness of the sheet may be 10 to 30 GU. If the 20° glossiness of the sheet exceeds 30 GU, glare may occur when viewing the content of a photo, picture, or display through the sheet from an angle of 20°, and if it is less than 10 GU, the content of the photo, picture, or display may be glared through the sheet. Discrimination may be difficult when viewing content from a 20° angle. Specifically, in the case of a sheet covering a display screen, the sheet 20° glossiness may be 40 to 50 GU, and in the case of a sheet covering a picture frame, the sheet 20° glossiness may be 15 to 30 GU.

Additionally, the sheet may have a blocking rate of 30 to 80% for light with a wavelength range of 380 nm to 480 nm, which is the blue region of the spectrum. By blocking light in the blue region, a blue light blocking effect can be obtained, thereby reducing eye fatigue.

The sheet may have a transmittance of less than 0.1% for light with a wavelength range of less than 380 nm, which is the ultraviolet region of the spectrum. By blocking light in the ultraviolet range, it is possible to obtain a UV blocking effect and reduce damage to the eyes.

UV blockers that block light in the UV-blocking series include benzotriazole-based, hindered amine-based, benzophenone-based, salicylate-based, benzylidene malonate-based, triazine-based, cinnamic acid derivatives, oxanilide, and combinations thereof. It may contain a substance selected from the group consisting of:

Benzotriazole series can be commercially available under the brand names TINUVIN 234, TINUVIN 234, TINUVIN 326, TINUVIN 329, TINUVIN 360 (Cibageigy), etc., or under the brand names SONGSORB 2340, SONGSORB 3200 (Songwon Industrial Co., Ltd.), etc. , most preferably TINUVIN 326.

Hindered Amine Light Stabilizer (HALS) is a compound containing an amine functional group that is used as a stabilizer for plastics and polymers. These compounds are typically derivatives of tetramethyl piperidine and are mainly used to protect polymers from photo-oxidation effects. This is in contrast to other forms of polymer degradation, such as ozonolysis. It is widely used as a heat stabilizer.

Benzophenones can be used as photoinitiators in UV curing applications such as inks, imaging and clear coatings in the printing industry. Benzophenone prevents ultraviolet (UV) light from damaging scents and colors in products such as perfume and soap. Additionally, it can be added to plastic packaging as a UV blocker to prevent photodegradation of the packaging polymer or its contents. It can be used to package products in clear glass or plastic (e.g. PETE water bottles). Without benzophenone, opaque or dark packaging is required.

Cyanoacrylates may include methyl cyanoacrylate, ethyl cyanoacrylate, butyl cyanoacrylate, octyl cyanoacrylate, and aryl cyanoacrylate.

The benzylidene malonate system is commercially available under the trade name Hostavin B-CAP. Hostavin B-CAP is a highly efficient UV blocker in engineering plastics. It ensures that the initial color of polypropylene resin is maintained at its best. Hostavin B-CAP can be applied to polyesters, polypropylene, and polymethyl methacrylate, and can significantly improve photodegradation prevention performance when used with an amine-based light stabilizer.

Triazine series may include 1,2,3-triazine, 1,2,4-triazine, and 1,3,5-triazine.

Cinnamic acid (C ₆ H ₅ CH＝CHCOOH) has cis and trans forms, but the trans form is usually used. Although it exists naturally, it is easily synthesized from benzaldehyde. Colorless needle-shaped crystals with a weak aroma, molecular weight 148.16, melting point 135°C. The boiling point is 300℃ and the specific gravity is 1.25. Soluble in ethanol and ether. It exists in the form of free or ester in chicken oil (cassia oil), Peruvian balsam, and fragrant oil. Since esters are aromatic, they are used in fragrances and cosmetics. Cinnamic acid derivatives refer to derivatives of the above-mentioned cinnamic acid, and include cyanoacrylate, malonates, etc.

Oxanilide is a scale-shaped crystal (recrystallized from benzene or nitrobenzene) with a melting point of 254°C (252-253°C) and a boiling point of over 360°C. It is easily soluble in benzene, but insoluble in hot ethanol and insoluble in water and ether.

In addition, UV blocking agents such as salicylate, which are widely known to those skilled in the art, can be provided, but are not limited thereto.

Additionally, the sheet may contain a blue-based pigment. The pigment may be an organic pigment or an inorganic pigment commonly used in the field. Specifically, water-soluble azo pigment, insoluble azo pigment, phthalocyanine pigment, quinacridone pigment, isoindolinone pigment, isoindoline pigment, perirene pigment, perinone pigment, dioxazine pigment, anthraquinone pigment, and diane. Examples include traquinonyl pigment, anthrapyrimidine pigment, anthanthrone pigment, indanthrone pigment, pravanthrone pigment, pyranthrone pigment, and diketopyrroropyrrole pigment.

Examples of the inorganic pigment include metal compounds such as metal oxides and metal complex salts, and specifically, oxides of metals such as iron, cobalt, aluminum, cadmium, lead, copper, titanium, magnesium, chromium, zinc, antimony, and carbon black. Or complex metal oxides, etc. can be mentioned.

In particular, the organic pigments and inorganic pigments include compounds classified as pigments in the color index (published by The Society of Dyers and Colourists), and more specifically, the color index (C.I.) numbers as follows: Pigments may be included, but are not necessarily limited to these, and these may be used alone or in combination of two or more to produce a pigment according to the target color density and blue color.

C.I. Pigment yellow 13, 20, 24, 31, 53, 83, 86, 93, 94, 109, 110, 117, 125, 137, 138, 139, 147, 148, 150, 153, 154, 166, 173, 180 and 185;

C.I. Pigment Orange 13, 31, 36, 38, 40, 42, 43, 51, 55, 59, 61, 64, 65, and 71;

C.I. Pigment Red 9, 97, 105, 122, 123, 144, 149, 166, 168, 176, 177, 180, 192, 208, 215, 216, 224, 242, 254, 255 and 264;

C.I. Pigment Violet 14, 19, 23, 29, 32, 33, 36, 37 and 38;

C.I. Pigment Blue, 21, 28, 60, 64, and 76;

C.I. Pigment Green 7, 10, 15, 25, 36, 47, 58, 59, 62 and 63 C.I Pigment Brown 28;

C.I Pigment Black 1 and 7 etc.

According to one embodiment of the present invention, when the thickness of the sheet is 2.0 to 4.5 mm, the anti-glare sheet may be used as a sheet covering a picture frame. Preferably it may be 2.5 to 4.0 mm. If the thickness of the sheet is less than 2.0 mm, the sheet covering the picture frame is not durable, and if it is greater than 4.5 mm, it is inefficient in terms of cost.

According to one embodiment of the present invention, when the thickness of the sheet is 1.0 to 2.5 mm, the anti-glare sheet may be used as a sheet covering the display screen. Preferably it may be 1.2 to 2.8 mm. If the thickness of the sheet is less than 1.0 mm, the sheet covering the display screen is not durable, and if it is greater than 2.5 mm, refraction becomes strong, making it difficult to identify the contents of the display screen.

The third aspect of the present application is,

An embossed roll for manufacturing an anti-glare sheet is provided in which irregularities are formed on the surface of the roll, the arithmetic average roughness (Ra) of the roll surface is 2.5 to 4.5 ㎛, and the 10-point average roughness (Rz) is 10 to 28 ㎛.

Detailed descriptions of parts that overlap with the first and second aspects of the present application may be omitted, and the content described in the first and second aspects of the present application will be applied equally even if the description is omitted in the third aspect. You can.

Hereinafter, the emver roll for manufacturing anti-glare sheets according to the third aspect of the present application will be described in detail.

In one embodiment of the present application, by forming irregularities on the surface of the roll, diffuse reflection of light incident from the outside is induced on the anti-glare sheet manufactured by transferring from the roll, so that the reflected light is scattered, You can prevent glare when viewing pictures or content on the display.

In addition, by setting the arithmetic mean illuminance (Ra) of the roll surface to 2.5 to 4.5 ㎛, the arithmetic mean illuminance (Ra) of one surface of the anti-glare sheet is formed to be 0.25 to 0.4 ㎛, so that the light incident on the anti-glare sheet By maximizing diffuse reflection, glare can be maximally prevented when viewing photos, pictures, or display content through the anti-glare sheet. The arithmetic average roughness (Ra) is the average roughness of the surface, and when a certain length is determined and a straight line parallel to the average cross-sectional curve is drawn within that length, the straight line at which the area surrounded by this straight line and the cross-sectional curve is equal is set as the baseline, and the determined length is The absolute value of the difference between the heights of the patterns and the reference line can be obtained by integrating the determined length and dividing it by the determined length.

When the arithmetic mean roughness (Ra) of the roll surface is less than 2.5 ㎛, the arithmetic mean roughness (Ra) of one surface of the anti-glare sheet is less than 0.25 ㎛, and the haze degree may be less than 10, so that the sheet is exposed from the outside. Glare may occur due to incident light, and since the gloss may exceed 100, glare may occur due to light incident from the outside.

When the arithmetic mean roughness (Ra) of the roll surface is greater than 4.5 ㎛, the arithmetic mean roughness (Ra) of one surface of the anti-glare sheet is greater than 0.4 ㎛, and the degree of haze may exceed 30%, so that photos through the sheet , the transmittance of the sheet may be reduced when viewing pictures or content on the display.

The arithmetic mean roughness (Ra) of the roll surface may be preferably 2.8 to 4 ㎛, and more preferably 3 to 3.8 ㎛.

In addition, by setting the 10-point average roughness (Rz) of the roll surface to 10 to 28 ㎛, the 10-point average roughness (Rz) of one surface of the anti-glare sheet is formed to 1.1 to 1.7 ㎛, so that the incident light on the anti-glare sheet By maximizing the diffuse reflection of light, the anti-glare sheet can maximize glare when viewing photos, pictures, or display content. The 10-point average roughness (Rz) may be the sum of the average height of the five highest peaks and the average depth of the five deepest valleys in the profile within a 4 mm range of the roll surface.

The 10-point average roughness (Rz) of the roll surface may be preferably 12 to 25 ㎛, and more preferably 15 to 22 ㎛.

In addition, by setting the peak water illuminance (Rpc) of the surface of the roll to 80 to 110, the peak water illuminance (Rpc) of one surface of the anti-glare sheet is formed to be 80 to 110, so that the anti-glare sheet manufactured by transferring from the roll By maximizing the diffuse reflection of light incident on the sheet, glare can be maximally prevented when viewing photos, pictures, or display content through an anti-glare sheet. The peak water irradiance (Rpc) refers to the average value of the peak water irradiance (Rpc) of three arbitrary points, and the peak water irradiance (Rpc) of each of the points is according to the steel-iron test schedule (SEP 1940) standard. This is the number of effective peaks rising above the upper baseline of 0.5㎛ per unit sampling length of 4mm in the surface roughness profile obtained according to this. At this time, there is at least one valley deeper than the lower baseline of -0.5㎛ between neighboring effective peaks. If there is no valley deeper than the -0.5㎛ lower baseline between neighboring peaks that rise above the upper baseline, all of the neighboring peaks are “effective peaks” that are used to measure peak water irradiance (Rpc). cannot be, and in calculating the number of “effective peaks,” relatively lower peaks among the above peaks are ignored.

The peak water roughness (Rpc) of the roll surface may preferably be 80 to 100 ㎛.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement it. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein.

Example 1.

After adding 5 parts by weight of ethyl cyanoacrylate as a benzotriazole-based UV and blue light blocker to 95 parts by weight of polymethyl methacrylate resin in a molten state, C.I. was added as a blue pigment. Add 5 parts by weight of phthalocyanine pigment of Pigment Blue 60 and mix in a container at 245°C to prepare sheet resin.

The anti-glare sheet resin is discharged between the first roll 11 at 85°C and the second roll 12 at 75°C at a discharge rate of 100 to 150 kg/hr and a width of 700 mm.

The sheet that has passed through the first roll (11) and the second roll (12) is in close contact with the second roll (12) and is seen after passing through the third roll (13) and the second roll (12) at 122°C. The sheet of the invention is manufactured.

The first roll 11 and the second roll 12 have polished surfaces, and the third roll 13, which is an emboss roll, has an arithmetic surface roughness (Ra) of 3.50 ㎛ and a 10-point average roughness (Rz). ) is 16.69 ㎛.

The arithmetic surface roughness of the produced sheet is 0.28 μm.

Example 2.

It is the same as Example 1, except that the arithmetic surface roughness of the third roll 13 is 2.97 ㎛ and the 10-point average roughness (Rz) is 12.19 ㎛. The arithmetic surface roughness (Ra) of the manufactured sheet was 0.26 μm.

Example 3.

It is the same as Example 1, except that the arithmetic surface roughness (Ra) of the third roll 13 is 3.26 ㎛ and the 10-point average roughness (Rz) is 19.46 ㎛. The arithmetic surface roughness (Ra) of the manufactured sheet was 0.29 μm.

Example 4.

It is the same as Example 1, except that the arithmetic surface roughness (Ra) of the third roll 13 is 3.82 ㎛ and the 10-point average roughness (Rz) is 24.31 ㎛. The arithmetic surface roughness (Ra) of the manufactured sheet was 0.33 μm.

Example 5.

The third roll is polished to have a smooth surface, and the surface roughness of the second roll is set to 3.50 ㎛ using an embroidered roll, the first roll is 90°C, the second roll is 112°C, and the third roll is 106°C. It is the same as Example 1 except that. The surface roughness of the manufactured sheet was 0.30 μm.

Example 6.

The third roll is polished to have a smooth surface, and the surface roughness of the second roll is set to 3.50 ㎛ using an embroidered roll, the first roll is 93°C, the second roll is 115°C, and the third roll is 106°C. It is the same as Example 1 except for this. The surface roughness of the manufactured sheet was 0.28 μm.

Example 7.

The third roll is polished to have a smooth surface, and the surface roughness of the second roll is set to 3.50 ㎛ using an embroidered roll, the first roll is 90°C, the second roll is 115°C, and the third roll is 110°C. It is the same as Example 1 except for this. The surface roughness of the manufactured sheet was 0.32 μm.

Example 8.

The third roll is polished to have a smooth surface, and the surface roughness of the second roll is set to 3.50 ㎛ using an embroidered roll, the first roll is 92°C, the second roll is 117°C, and the third roll is 109°C. It is the same as Example 1 except that. The surface roughness of the manufactured sheet was 0.33 μm.

Comparative Example 1.

Except that the arithmetic surface roughness (Ra) of the second roll (12) was set to 2.17 μm and the 10-point average roughness (Rz) was set to 8.96 μm, and the surface of the third roll (13) was polished to make the surface smooth. is the same as Example 1.

Comparative Example 2.

Except that the arithmetic surface roughness (Ra) of the second roll (12) was set to 1.39 ㎛ and the 10-point average roughness (Rz) was 7.89 ㎛, and the surface of the third roll (13) was polished to make the surface smooth. is the same as Example 1.

Comparative Example 3.

The same as Example 1 except that the arithmetic surface roughness (Ra) of the third roll 13 was set to 0.66 ㎛ and the 10-point average roughness (Rz) was set to 3.83 ㎛.

Comparative Example 4.

The same as Example 1 except that the arithmetic surface roughness (Ra) of the third roll 13 was set to 1.72 ㎛ and the 10-point average roughness (Rz) was set to 8.60 ㎛.

Experimental Example 1. Arithmetic average illuminance (Ra) and peak number illuminance (Rpc) measurement experiment

The arithmetic average roughness (Ra) and peak number roughness (Rpc) of the anti-glare sheets manufactured according to the above Examples and Comparative Examples were measured using a KS B 0501 stylus surface roughness meter.

Experimental Example 2. Haze and transmittance measurement experiment

The transmittance and haze of the anti-glare sheets manufactured according to the above examples and comparative examples were measured. The measurement method was measured with a haze meter according to ASTM D1003. The size of the specimen is (50X50mm).

The measurement results are shown in Table 1 below.

Experimental Example 3. Glossiness measurement experiment

The glossiness of the anti-glare sheets manufactured according to the above Examples and Comparative Examples was measured according to the ASTM D523 standard.

Experimental Example 4. Measurement of sheet thickness

The thickness of the anti-glare sheets manufactured according to the above examples and comparative examples was measured using a measuring instrument such as a micrometer according to KS B 5202 (micrometer).

At this time, the thickness measurement area was measured at the center point and at 9 cm intervals to the left and right, and the thickness was measured at a point within 2 to 3 cm from the end (cut) of the sheet.

As a result of the measurement, the thickness of the light diffusion sheets prepared in Preparation Examples 1 to 3 was measured to be about 3 mm (error range ±0.05 cm). Therefore, it was confirmed that the anti-glare sheet manufactured in the above example has a thin thickness and has excellent performance as an anti-glare sheet, so it can be more suitably applied to displays and picture frames with a thin thickness.

The measurement results of Experimental Examples 1 to 4 are shown in Table 1 below.

division Transmittance
(%) Cloudiness
(%) Glossiness
(GU) Illuminance transfer rate
(%) thickness
(mm) Ember Roll 60° 20 ^° Ra(um) Rpc Example 1 92.09 22.39 47.8 22.5 0.28 81.1 8 3.0 Roll 3 Example 2 91.20 21.22 45.32 21.6 0.26 83.3 8.4 3.0 Roll 3 Example 3 93.11 24.63 44.26 20.3 0.29 85.5 9.5 3.0 Roll 3 Example 4 91.26 20.61 46.38 22.7 0.33 81.6 7.7 3.0 Roll 3 Example 5 86.44 7.96 64.80 41.3 0.30 82.1 9.0 2.0 Roll 2 Example 6 85.44 8.39 64.00 42.6 0.28 84.3 8 2.0 Roll 2 Example 7 89.67 4.58 67.80 47.7 0.32 81.5 9 1.5 Roll 2 Example 8 88.53 4.55 66.70 46.1 0.33 80.6 9 1.5 Roll 2 Comparative Example 1 93.52 0.63 139.0 97.0 0.17 80.1 7.8% 3.0 Roll 2 Comparative Example 2 93.42 1.04 119.0 82.0 0.29 71.7 21% 3.0 Roll 2 Comparative Example 3 92.48 5.28 112 77.4 0.12 83.1 18% 3.0 Roll 3 Comparative Example 4 91.92 13.11 59.0 36.7 0.23 87.9 13% 3.0 Roll 3

Referring to Table 1, the arithmetic mean roughness (Ra) of Examples 1 to 8 is 0.26 to 0.33 ㎛, the peak number roughness (Rpc) is 80.6 to 85.5, the 60° gloss is 42.26 to 67.80 GU, and the 20° gloss is. Since the degree is 20.3~47.7 GU, the anti-glare effect is excellent even when viewing the sheet from various angles, and the transmittance is over 85.44%. In Examples 1 to 4, the haze was 18% or more and the transmittance was 90% or more, and the transparency was excellent, but the haze was higher than that of the comparative example, so the glare prevention effect of the sheet was higher than that of the comparative example. It is excellent and suitable for use as a sheet covering a picture frame. In the case of Examples 5 to 8, the thickness is 1.5 to 2.0 mm, the 60° gloss is 70 GU or less, and the 20° gloss is 50 GU or less, so the importance of gloss is relatively lower and thinner than the sheets used in picture frames. It is suitable for use in sheets covering display screens that require thickness.

Above, the present invention has been described in detail along with preferred embodiments, but the scope of the technical idea of the present invention is not limited to these embodiments. Accordingly, various modifications or equivalent embodiments may exist within the scope of the technical idea of the present invention. Therefore, the scope of rights of the technical idea according to the present invention should be interpreted in accordance with the claims, and technical ideas within the scope equivalent or equivalent thereto should be interpreted as falling within the scope of the rights of the present invention.

Claims (15)

A first input step of injecting the molten sheet resin between the rotating first roll (11) and the rotating second roll (12); and
A second input step in which the sheet resin that has passed through the first input step is in close contact with the second roll (12) and passes between the second roll (12) and the rotating third roll (13),
One selected from the group consisting of the second roll (12) and the third roll (13) is the embellishment roll,
The temperature of the first roll (11) is higher than the temperature of the second roll (12), and the temperature of the third roll (13) is higher than the temperature of the first roll (11),
Irregularities are formed on the surface of the emver roll,
A method of manufacturing an anti-glare sheet using an ember roll, characterized in that the arithmetic average roughness (Ra) of the surface of the emver roll is 2.5 to 4.5 ㎛, and the 10-point average roughness (Rz) is 10 to 25 ㎛.

According to paragraph 1,
The rotation direction of the first roll 11 and the third roll 13 are the same, and the rotation direction of the second roll 12 is opposite to the rotation direction of the first roll 11. How to manufacture anti-glare sheets using ember roll.
delete According to paragraph 1,
Ember roll, characterized in that the temperature of the first roll (11) is lower than the temperature of the second roll (12), and the temperature of the third roll (13) is lower than the temperature of the second roll (12). Method of manufacturing anti-glare sheets using emver roll. According to paragraph 1,
When the third roll 13 is an emboss roll, the temperature of the first roll 11 is 60 to 105 ° C, the temperature of the second roll 12 is 55 to 95 ° C, and the third roll 13 ) A method of manufacturing an anti-glare sheet using an ember roll, characterized in that the temperature is 100 to 145 ℃. According to paragraph 1,
When the second roll 12 is an emboss roll, the temperature of the first roll 11 is 70 to 110 ° C, the temperature of the second roll 12 is 100 to 140 ° C, and the third roll 13 ) A method of manufacturing an anti-glare sheet using an ember roll, characterized in that the temperature is 90 to 130 ℃. According to paragraph 1,
When the amber roll is the second roll (12), a method of manufacturing an anti-glare sheet using an amber roll, characterized in that the thickness of the sheet that has gone through the second input step is 1.0 to 2.5 mm. According to paragraph 1,
When the amber roll is the third roll (13), a method of manufacturing an anti-glare sheet using an amber roll, characterized in that the thickness of the sheet that has gone through the second input step is 2.5 to 4.5 mm.
According to paragraph 1,
An anti-glare sheet using an emver roll, characterized in that the rotation speed of the first roll (11), the second roll (12), and the third roll (13) is 0.8 m/min to 3.0 m/min. Manufacturing method.
delete According to paragraph 1,
A method of manufacturing an anti-glare sheet using an ember roll, characterized in that the peak water illuminance (Rpc) of the emver roll is 80 to 110 ㎛. According to paragraph 1,
A method of manufacturing an anti-glare sheet using an ember roll, characterized in that the transfer rate of the emver roll to the sheet is 5 to 20%. An anti-glare sheet manufactured by the anti-glare sheet manufacturing method using the ember roll of claim 1. Irregularities are formed on the roll surface,
An arithmetic average roughness (Ra) of the roll surface of 2.5 to 4.5 ㎛ and a 10-point average roughness (Rz) of 10 to 28 ㎛. According to clause 14,
Ember roll for manufacturing anti-glare sheets, characterized in that the peak water illuminance (Rpc) of the emver roll for manufacturing anti-glare sheets is 80 to 110 ㎛.