KR102133512B1 - A curved glass printing apparatus provided with a transfer roller having a multi-layer structure and a printing method using the same - Google Patents

Abstract

The present invention relates to a curved glass printing apparatus having a transfer roller having a multilayer structure and a printing method using the same. An embodiment of the curved glass printing apparatus includes: a pattern roller provided as a groove on a surface and in which a pattern for receiving a printing material is formed; a transfer roller that contacts and rotates with the pattern roller to transfer the printing material to the surface from the pattern roller and prints the transferred printing material on the surface of curved glass; a blade provided to contact the surface of the pattern roller, and removing the printing material attached to a portion other than the pattern from the surface of the pattern roller as the pattern roller rotates, the transfer roll includes: a core roll coupled to a rotation shaft; and a surface layer of a flexible material formed by stacking on the core roll.

Description

A curved glass printing apparatus provided with a transfer roller having a multi-layer structure and a printing method using the same}

An embodiment relates to a curved glass printing apparatus having a structure capable of improving print quality when printing on curved glass, and a printing method using the same.

The content described in this section merely provides background information for the embodiment and does not constitute a prior art.

In general, curved glass having a curved side may be used in a vehicle window or a dashboard. In addition, various curved glasses have been used in mobile devices such as smart phones, smart watches, tablet PCs, and mobile phones due to design improvements, increased functions, and user convenience.

The curved glass generally has a shape including a planar portion that is a plate-shaped portion having a relatively small curvature when viewed in a plane or a cross section, and a curved portion that is a curved portion having a relatively large curvature on one side or edge of the flat portion.

The curved glass may form a coating layer with various materials on its surface to function as a light guide plate, to block total reflection, or to cause the reflection, or to form an opaque region.

When such a coating layer is formed by a printing technique, the coating layer may be referred to as a printing layer.

When forming a printing layer on the curved glass, a gravure printing apparatus including a transfer roller can be used. The curved glass may include a flat portion that is an area of a flat surface and a curved portion having a certain radius of curvature.

Since the curved glass has a curved portion, when printing on the curved portion, printing may be difficult due to the curved shape, and product defects may occur. Therefore, it is necessary to develop a technology capable of solving these problems.

Accordingly, an embodiment relates to a curved glass printing apparatus having a structure capable of improving print quality when printing on curved glass, and a printing method using the same.

The technical problems to be achieved by the embodiments are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by a person having ordinary knowledge in the technical field to which the embodiment belongs from the following description.

An embodiment of the curved glass printing apparatus includes a pattern roller having grooves on its surface and a pattern for receiving a printing material is formed; A transfer roller that contacts and rotates with the pattern roller to transfer a printing material from the pattern roller to the surface, and print the transferred printing material on the surface of the curved glass; And a blade that is provided to contact the surface of the pattern roller, and removes a printing material attached to a portion other than the pattern from the surface of the pattern roller as the pattern roller rotates. A core roll to be joined; And a surface layer of a flexible material formed by being stacked on the core roll.

The surface layer may include a first layer laminated on the core roll; And a second layer laminated on the first layer and having a higher hardness than the first layer.

The thickness of the first layer may be greater than the thickness of the second layer.

The second layer may be formed to have a lower hardness than the core roll.

According to an embodiment of the curved glass printing apparatus, a protrusion having a shape corresponding to a curved portion of the curved glass may be formed on the surface of the second layer.

The protrusion may be formed on a surface of the transfer roller, having a constant width in the longitudinal direction of the transfer roller, and may be provided in plural, radially arranged based on the center of the transfer roller.

Another embodiment of the curved glass printing apparatus includes a pattern roller having grooves on its surface and a pattern for receiving a printing material is formed; A transfer roller that contacts and rotates with the pattern roller to transfer a printing material from the pattern roller to the surface, and print the transferred printing material on the surface of the curved glass; And a blade that is provided to contact the surface of the pattern roller, and removes a printing material attached to a portion other than the pattern from the surface of the pattern roller as the pattern roller rotates. Bonding core rolls; A first layer laminated on the core roll; And a second layer laminated on the first layer and having a higher hardness than the first layer.

In another embodiment of the curved glass printing apparatus, the thickness of the first layer may be formed to be larger than the thickness of the second layer, and the second layer may be formed to have a lower hardness than the core roll.

In an embodiment, the second layer is provided with a higher hardness than the first layer, so that it is possible to effectively suppress the entire surface layer from being excessively deformed during printing due to the first layer having a lower hardness than the second layer. The first layer is provided with a lower hardness than the second layer, and due to the second layer having a relatively high hardness compared to the first layer, the entire surface layer has a low degree of deformation during printing, so that air bubbles remain in the printed layer and thus remain curved. The generation of unprinted areas on the glass can be effectively suppressed.

In an embodiment, due to the above structure, sufficient adhesion between the curved glass and the jig and the surface layer is secured by the first layer, and at the same time, bubbles remain in the printed layer to effectively suppress the occurrence of unprinted areas on the curved glass, thereby effectively curved glass. Can improve the print quality.

In an embodiment, the second layer is provided with a relatively high hardness compared to the first layer, so that adhesion between the surface layer and the curved glass or jig is suppressed to increase the speed and speed of the printing operation and effectively suppress product defects. have.

In the embodiment, the first layer, which is relatively low in hardness and is easily deformed by external force, is formed thicker than the second layer, which is relatively high in hardness, so that the second layer is smoothly deformed and adheres to curved glass and a jig. By doing so, it is possible to effectively suppress the generation of unprinted areas on the curved glass due to the presence of air bubbles remaining on the printed layer.

1 is a view showing a curved glass of an embodiment.
FIG. 2 is a cross-sectional view of FIG. 1 taken along the direction AA.
3 is a schematic view showing a curved glass printing apparatus of an embodiment.
4 is a side view showing a transfer roller of one embodiment.
5 is an enlarged view of part A of FIG. 4.
6 is a plan view showing a transfer roller of one embodiment.
7 is a view showing a process of forming a printed layer on the curved glass.
8 is a side view showing a transfer roller of another embodiment.
9 is a flow chart showing a printing method using a curved glass printing apparatus according to one embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Embodiments may be variously changed and have various forms, and specific embodiments will be illustrated in the drawings and described in detail in the text. However, it is not intended to limit the embodiment to a specific disclosure form, it should be understood that it includes all modifications, equivalents, or substitutes included in the spirit and scope of the embodiment.

The terms "first", "second", etc. can be used to describe various components, but the components should not be limited by the terms. The terms are used to distinguish one component from other components. In addition, terms specifically defined in consideration of the configuration and operation of the embodiments are only for describing the embodiments and do not limit the scope of the embodiments.

In the description of the embodiment, when described as being formed on the "top (top)" or "bottom (bottom) (on or under)" of each element, the top (top) or bottom (bottom) (on or under) ) Includes both two elements directly contacting each other or one or more other elements formed indirectly between the two elements. In addition, when expressed as “up (up)” or “down (down)” (on or under), it may include the meaning of the downward direction as well as the upward direction based on one element.

In addition, relational terms, such as "top/top/top" and "bottom/bottom/bottom" as used hereinafter, do not necessarily require or imply any physical or logical relationship or order between such entities or elements, It can also be used to distinguish one entity or element from another.

1 is a view showing a curved glass of an embodiment. FIG. 2 is a cross-sectional view of FIG. 1 taken along the direction AA.

The curved glass 10 of the embodiment may be used for a cover glass of a mobile device, a light guide plate, and various other uses. In addition, the curved glass 10 may be used for applications such as forming a vehicle window, a dashboard, or other components. The curved glass 10 may be, for example, transparent and formed of a glass material.

On the other hand, the curved glass 10 of the embodiment has, for example, a structure including a flat portion 11 and a curved portion 12, or a curved portion having a gentle curvature radius and a curved surface having a larger curvature radius than the curved portion It may have a structure including a roll (12).

Hereinafter, the curved portion is not separately distinguished and is included in the flat portion 11. Therefore, in the following, it can be understood that the flat portion 11 includes a curved portion.

In an embodiment, it may be difficult to clearly distinguish the flat portion 11 and the curved portion 12 of the curved glass 10. Therefore, in the following description, referring to FIG. 2, a portion of the curved glass 10 corresponding to a portion occupied by the first printing layer 110 on the curved glass 10 is a flat portion 11 of the curved glass 10 ). In addition, the portion of the curved glass 10 corresponding to the portion occupied by the second printed layer 120 on the curved glass 10 is defined as the curved portion 12 of the curved glass 10.

Referring to FIG. 2, printing of the surface of the curved glass 10 is to form a printing layer 100 on the surface of the curved glass 10 using a printing material 30 (see FIG. 3 ).

The printing layer 100 may be formed transparently or opaquely depending on the material of the printing material 30 of various materials, and may have various colors.

In FIG. 1, the transfer roller 1200 (see FIG. 3) is moved in close contact with the curved glass 10 in a direction perpendicular to the AA direction, so that the printed layer 100 may be formed on the curved glass 10.

In an embodiment, the first printing layer 110 and the second printing layer 120 may be integrally continuously formed on the entire curved glass 10 by using one transfer roller 1200.

On the other hand, in another embodiment, the transfer roller 1200 is provided in a plurality, for example, 2 to 7, each transfer roller 1200 may be arranged side by side in the AA direction. Therefore, when the transfer roller 1200 moves in close contact with the curved glass 10, the transfer rollers 1200 may simultaneously form the printed layer 100 on each portion of the curved glass 10.

Accordingly, a printing layer 100 having different colors may be formed on each portion of the same curved glass 10 using this printing method. In addition, a transparent printing layer 100 may be formed on a portion of the curved glass 10, and an opaque printing layer may be formed on another portion.

The printing material 30 is opaque, and may be, for example, black ink. The black ink may have a composition such as a black pigment such as carbon black or titanium black, oligomer, polyfunctional monomer, adhesion promoter, polymerization inhibitor, and surfactant. The printing material 30 is transparent, and may be, for example, a polymer of transparent material.

The printing material 30 may be used in a mobile device in addition to it, and as long as it can be cured and attached to the curved glass 10, a single material or a mixture of rotted mixtures of the single material may be used as appropriate.

Meanwhile, the printing material 30 used to form the first printing layer 110 and the printing material 30 used to form the second printing layer 120 may be the same or may be different materials.

In addition, referring to FIG. 2, the embodiment shows that the printed layer 100 is formed on the upper surface of the “U” shaped curved glass 10 as a whole when viewed on paper.

In an embodiment, when the printing layer 120 is formed on the curved glass 10, a gravure printing method may be used. 3 is a schematic view showing a curved glass printing apparatus of an embodiment. The curved glass printing apparatus of FIG. 3 may be a gravure printing apparatus.

The curved glass printing apparatus 1000 of the embodiment includes a pattern roller 1100, a transfer roller 1200, a transfer unit 1300, a jig 1400, a blade 1500, a printing material supply means 1600, and a clean roller 1700. It may include.

The clean roller 1700, the transfer roller 1200 and the pattern roller 1100 may have a cylindrical shape. The clean roller 1700 is, for example, in close contact with the transfer roller 1200, the foreign matter existing on the surface of the transfer roller 1200, the printing remaining on the surface of the transfer roller 1200 without being transferred to the curved glass 10 The material 30 can be adsorbed and removed from the surface of the transfer roller 1200.

In addition, the clean roller 1700 may press the transfer roller 1200 so that the transfer roller 1200 can come into close contact with the pattern roller 1100 and the jig 1400 without separation.

The printing material supply means 1600 may partially contact the pattern roller 1100 and receive the printing material 30. As the pattern roller 1100 rotates, the printing material supply means 1600 may apply and supply the received printing material 30 to the surface of the pattern roller 1100.

The transfer roller 1200 is in contact with the pattern roller 1100 and the clean roller 1700, and the transfer roller 1200, the pattern roller 1100, and the clean roller 1700 rotate with each other by frictional forces acting by the contact. can do.

For example, by rotating the pattern roller 1100 directly connected to the driving means, the transfer roller 1200 and the clean roller 1700 in contact therewith may also rotate. In another embodiment, the transfer roller 1200 or the clean roller 1700 is directly connected to and rotates with the driving means, so that other rollers in contact with it can also rotate.

For example, referring to FIG. 3, when the pattern roller 1100 receiving the driving force rotates in the clockwise direction, the transfer roller 1200 in contact with this may rotate in the counterclockwise direction. In addition, when the transfer roller 1200 rotates counterclockwise, the clean roller 1700 in contact with it may rotate clockwise.

The pattern roller 1100 may have a pattern 1110 formed on its surface. Referring to FIG. 3, the pattern 1110 is provided as a groove on the surface of the pattern roller 1100 and the printing material 30 can be accommodated. The pattern 1110 may be formed with an appropriate pattern and position on the pattern roller 1100 to correspond to the pattern, position, etc. of the second printing layer 120 formed on the curved portion 12.

That is, in an embodiment, the pattern 1110 may be formed on the pattern roller 1100 to have a pattern and a position corresponding to the second printing layer 120 formed on the curved glass 10.

For example, the first printing layer 110 is formed in the center of the curved glass 10 with a constant width in the longitudinal direction of the curved glass 10, and the second printing layer 120 is curved glass 10 The edge of the curved glass 10 may be formed with a constant width in the longitudinal direction.

Therefore, the patterns 1110 may be formed on the surfaces of the pattern roller 1100 in shapes corresponding to the first printing layer 110 and the second printing layer 120, respectively.

The printing material 30 is transferred to the pattern 1110 of the pattern roller 1100, transferred to the surface of the transfer roller 1200 again, and finally the curved glass 10 seated on the jig 1400 (FIG. 3) (Not shown) to form the first printing layer 110 and the second printing layer 120.

The blade 1500 is provided to contact the surface of the pattern roller 1100, and as the pattern roller 1100 rotates, printing attached to a portion other than the pattern 1110 on the surface of the pattern roller 1100 The material 30 can be removed. That is, the blade 1500 may scrape the surface of the rotating pattern roller 1100 to remove the printing material 30 attached to a portion other than the pattern 1110 from the surface of the pattern roller 1100.

For example, referring to FIG. 3, when the blade 1500 scratches the surface of the pattern roller 1100, the printing material 30 remains only in the groove-shaped pattern 1110 and other than the pattern 1110 Print material 30 attached to the portion of the is removed by the blade (1500).

The transfer roller 1200 may contact and rotate with the pattern roller 1100 so that the printing material 30 may be transferred from the pattern roller 1100 to the surface.

As the transfer roller 1200 contacts and rotates with the pattern roller 1100, the printing material 30 remaining in the pattern 1110 may be transferred to the surface of the transfer roller 1200. As the transfer roller 1200 rotates, the printing material 30 transferred to the surface of the transfer roller 1200 is attached to the flat portion 11 and the curved portion 12 of the curved glass 10 seated on the jig 1400. Can be printed.

The jig 1400 is mounted on the transfer unit 1300, and when the transfer unit 1300 moves, for example, in the D1 direction, the jig 1400 may also move in the D1 direction. The curved glass 10 is seated on the jig 1400 and may move together according to the movement of the jig 1400. The curved glass 10 may be placed and seated on the jig 1400 such that its width direction (a direction perpendicular to the AA direction in FIG. 1) coincides with the D1 direction.

The transfer unit 1300 moves in the D1 direction, for example, to move the jig 1400 mounted on the transfer unit 1300 and the curved glass 10 seated on the jig 1400 in the D1 direction, and accordingly, the curved glass 10 ) Is moved in the D1 direction, the transfer roller 1200 may sequentially contact the flat portion 11 and the curved portion 12 of the curved glass 10.

Accordingly, the printing material 30 transferred to the surface of the transfer roller 1200 may be sequentially printed on the flat portion 11 and the curved portion 12 of the curved glass 10.

4 is a side view showing the transfer roller 1200 of one embodiment. 5 is an enlarged view of part A of FIG. 4. 6 is a plan view showing a transfer roller 1200 of one embodiment.

4 to 6, the transfer roller 1200 may include a core roll 1250 and a surface layer 1260.

The core roll 1250 may be formed to form a central portion of the transfer roller 1200 and engage with a rotation shaft 1201 that is a rotation center of the transfer roller 1200. At this time, the core roll 1250 may be provided with a rigid material, that is, a non-flexible material.

Therefore, the core roll 1250 may not be deformed even when subjected to an external pressing force while the printing operation is in progress, or only a very slight deformation may be generated such that the deformation is negligible.

The surface layer 1260 is formed by being stacked on the core roll 1250, and may be provided with a flexible material. Accordingly, while the printing operation is in progress, the surface layer 1260 may be deformed under an external pressing force to be in close contact with the curved glass 10 or the jig 1400.

Thus, by having a structure in which the surface layer 1260 is in close contact with the curved glass 10 or the jig 1400, the transfer roller 1200 of the embodiment has a bubble hole in the printing layer 100 and the curved glass 10 ) Can effectively suppress the occurrence of an unprinted area, and increase the print quality of the curved glass 10 product.

The surface layer 1260 may be formed of a single layer of a single material, or in another embodiment, the surface layer 1260 may have a multi-layer structure in which materials having different hardness are sequentially stacked.

When the surface layer 1260 has a multi-layered structure, for example, the surface layer 1260 may include a first layer 1261 and a second layer 1262. The first layer 1261 may be stacked on the core roll 1250. The second layer 1262 is stacked on the first layer 1261 and may be formed of a material having a higher hardness than the first layer 1261. Accordingly, the second layer 1262 may have a hardness lower than that of the core roll 1250 and a hardness higher than that of the first layer 1261.

That is, the surface layer 1260 is a first layer 1261 disposed inside so as to be adjacent to the core roll 1250 is a material having a low hardness, and a second layer disposed outside to contact the curved glass 10 in a printing operation (1262) may be provided with a high hardness material.

In this case, the first layer 1261 and the second layer 1262 may have a hardness of 10 or less by a Type C durometer according to JIS K 6253, and the first layer 1261 and the first layer 1261 in this range. The hardness of the second layer 1262 can be appropriately selected.

In another embodiment, the first layer 1261 may have a hardness of 10 or less by a Type C durometer according to JIS K 6253, and the second layer 1262 may have a hardness of 20 or less by the durometer. Can.

In another embodiment, the hardness of the surface layer 1260 including the first layer 1261 and the second layer 1262 may be provided by 10 or less.

If the surface layer 1260 is formed of only the second layer 1262 that is made of a flexible material but has a relatively high hardness, the surface layer 1260 is not sufficiently deformed even when subjected to an external force during printing, and thus the surface layer 1260 is curved. The glass 10 and the jig 1400 may not be sufficiently adhered, and as a result, air bubbles remain in the printing layer 100 to generate unprinted areas on the curved glass, thereby deteriorating the print quality of the curved glass 10 Can be. In particular, in this case, the surface layer 1260 is not sufficiently deformed in the curved portion 12 of the curved glass 10, resulting in a non-contact portion between the surface layer 1260 and the curved portion 12, and thereby the curved glass 10 The print quality may decrease.

If the surface layer 1260 is formed of only the first layer 1261 which is flexible and has low hardness, the surface layer 1260 may be excessively deformed by external force during printing. In this case, due to excessive deformation of the surface layer 1260, air bubbles remain in the surface layer 1260 and the print quality of the curved glass 10 may be deteriorated.

In addition, when the hardness of the surface layer 1260 is low, when an external force is applied, the surface layer 1260 may easily adhere to the curved glass 10 or the jig 1400, and thus the curved glass adhered to the surface layer 1260 (10) Since the jig 1400 needs to be removed, the speed of the print job may decrease and product defects may occur.

In addition, since the surface layer 1260 is formed of only the first layer 1261 which is flexible and has low hardness, when the hardness of the surface layer 1260 is low, durability of the surface layer 1260 decreases, and thus the surface layer is repeatedly used when the transfer roller 1200 is repeatedly used. The durability of the entire transfer roller 1200 may be a problem because the 1260 is easily deformed or permanently deformed.

In an embodiment, the second layer 1262 is provided with a higher hardness than the first layer 1262, and thus the entire surface layer 1260 due to the first layer 1261 having a relatively low hardness compared to the second layer 1262. Can effectively suppress excessive deformation during printing. The first layer 1261 is provided with a lower hardness than the second layer 1262, so that the entire surface layer 1260 is printed due to the second layer 1262 having a higher hardness than the first layer 1261. Due to the low degree of deformation, it is possible to effectively suppress the generation of unprinted areas on the curved glass 10 due to the presence of air bubbles remaining in the printing layer 100.

In an embodiment, due to the above structure, sufficient adhesion between the curved glass 10 and the jig 1400 and the surface layer 1260 is secured by the first layer 1261, and at the same time, air bubbles remain in the printing layer 100, The generation of an unprinted area on the curved glass 10 can be effectively suppressed, thereby improving the print quality of the curved glass 10.

In the embodiment, the second layer 1262 is provided with a relatively high hardness compared to the first layer 1261, so that the adhesion between the surface layer 1260 and the curved glass 10 or the jig 1400 is suppressed. It can increase the running speed and working speed and effectively suppress product defects. In addition, durability of the surface layer 1260 may be increased due to the above-described structure.

In an embodiment, the thickness of the first layer 1261 may be greater than the thickness of the second layer 1262. The second layer 1262 may be formed of a material having a higher hardness than the first layer 1261 to solve the above-described adhesion problem and bubble residual problem. However, in the embodiment, it is necessary to have a structure in which the second layer 1262 in contact with the curved glass 10 is deformed to sufficiently correspond to the shape of the curved glass 10.

Therefore, in the embodiment, the first layer 1261 receives external force by forming the first layer 1261, which is relatively low in hardness and easily deformed by external force, than the second layer 1262, which has a relatively high hardness. When it is smoothly deformed, it is in close contact with the curved glass 10 and the jig 1400, and air bubbles remain in the printing layer 100, so that it is possible to effectively suppress generation of unprinted areas on the curved glass 10.

For example, when the thickness of the entire surface layer 1260 is designed to be 15 mm, the thickness of the first layer 1261 may be 10 to 13 mm, and the thickness of the second layer 1262 may be 2 to 5 mm.

4 to 6, the transfer roller 1200 may have a protrusion 1210 having a shape corresponding to the curved portion 12 of the curved glass 10 on the surface.

The protruding portion 1210 has a shape corresponding to the curved portion 12, so that the printing material 30 is transferred to the protruding portion 1210 and brought into contact with the curved portion 12, thereby making it easy to contact the curved portion 12. The second printing layer 120 may be formed.

Referring to FIG. 6, the protrusion 1210 may be continuously formed on the surface of the transfer roller 1200 with a constant width in the longitudinal direction of the transfer roller 1200. In addition, a plurality of protrusions 1210 may be provided, and may be radially disposed with respect to the center of the transfer roller 1200, respectively.

That is, the protrusions 1210 are continuously formed with a constant width in the longitudinal direction of the transfer roller 1200 on the surface of the transfer roller 1200, and spaced apart from each other in the circumferential direction of the transfer roller 1200 It can be provided in plurality.

In another embodiment, the protrusion 1210 may be provided in various shapes according to the shape of the curved glass 10 and the shape of the printed layer 100 to be printed. For example, the protrusion 1210 has a convex curved cross section on the surface of the transfer roller 1200, and such a curve may be a part of a circle or a part of an ellipse.

Hereinafter, the protrusion 1210 having the shape shown in FIGS. 4 to 6 will be described in detail. 7 is a view showing a process of forming the printed layer 100 on the curved glass 10.

As the curved glass 10 seated on the jig 1400 is transferred, the printing material 30 transferred to the transfer roller 1200 may form the printing layer 100 on the curved glass 10.

For example, the transfer roller 1200 contacts the flat portion 11 of the curved glass 10 to form a first printing layer 110 on the flat portion 11, and again the transfer roller 1200 moves By contacting the curved portion 12 of the curved glass 10, the second printing layer 120 may be formed on the curved portion 12.

In an embodiment, the first printing layer 110 and the second printing layer 120 may be continuously formed. That is, as the printing material 30 is transferred to the same transfer roller 1200, and as the transfer roller 1200 adheres to the surface of the curved glass 10 and moves continuously, the flat portion 11 of the curved glass 10 And the first printing layer 110 and the second printing layer 120 may be continuously formed on the curved portion 11, respectively.

Therefore, for example, the first printing layer 110 and the second printing layer 120 may be integrally formed continuously on the curved glass 10 of the same material. At this time, depending on the printing starting position and the moving direction of the transfer roller 1200, the first printing layer 110 may be formed first, and then the second printing layer 120 may be formed, or, conversely, the second printing layer 120 ) May be formed first, and then the first printing layer 110 may be formed.

When the first printing layer 110 is printed, the transfer roller 1200 has a portion other than the protrusion 1210 and the protrusion 1210 contacting the flat portion 11 to form the first printing layer 110. Can be.

When printing the second printing layer 120, the transfer roller 1200 moves so that the protruding portion 1210 is in close contact with the curved portion 12 so that the printing material 30 is printed on the curved portion 12, A second printing layer 120 may be formed on the curved portion 12.

Referring to FIG. 7, in the curved portion 12, the protrusion 1210 is compressed in a portion having the smallest radius of curvature, so that the second printed layer 120 can be formed very accurately in the curved portion 12. Therefore, in order to effectively adhere between the protruding portion 1210 and the curved portion 12, as described above, the protruding portion 1210 may be formed in a convex curved section.

In an embodiment, by forming the projections 1210 on the transfer roller 1200, the projections 1210 are effectively in close contact with the respective portions of the curved portion 12, and thus, the shape and thickness designed for the curved portion 12 are The branch can easily and accurately form the second printing layer 120.

When the curved portion 12 is formed on one side of the curved glass 10, for example, first, the curved glass 10 is brought into close contact with the flat portion 11, and the first printing layer ( 110), and then, by moving the transfer roller 1200, the protrusion 1210 is in close contact with the curved portion 12 to form the second printing layer 120 on the curved portion 12. However, as another embodiment, first, the second printing layer 120 is formed on the curved portion 12, and then the transfer roller 1200 is moved to form the first printing layer 110 on the flat portion 11. You may.

On the other hand, when the curved portion 12 is formed on both sides of the curved glass 10, for example, by using the transfer roller 1200 including the projection 1210, the curved portion of the curved glass 10 side ( 12) to form a second printing layer 120, the transfer roller 1200 is moved to the flat portion 11 located in the center of the curved glass 10, the first printing layer (11) on the flat portion 11 110), the transfer roller 1200 is moved again to form the second printing layer 120 on the curved portion 12 on the other side of the curved glass 10.

In an embodiment, when the second printing layer 120 is formed by adhering the protrusion 1210 to the curved portion 12, in particular, the radius of curvature of the curved portion 12 is 10 mm or less, and the second printing layer 120 ) Is very effective when the depth is 2.5mm or more.

At this time, the hardness of the surface of the transfer roller 1200 including the protrusion 1210 may be, for example, a hardness of 10 or less by a Type C durometer according to JIS K 6253.

The smaller the radius of curvature of the curved portion 11 and the larger the thickness, the more easily the product defects occur due to air bubbles and residuals in the second printed layer 120 when the second printed layer 120 is formed. Therefore, in the embodiment, when the second printing layer 120 is formed on the curved portion 11, the protrusions 1210 are brought into close contact with the curved portion 11, thereby generating bubbles due to the curved shape of the curved portion 11 And residuals.

That is, by transferring the protruding portion 1210 to the curved portion of the curved portion 11, so that the printing material 30 transferred to the surface of the protruding portion 1210 is printed in close contact with the surface of the curved portion 11, the transfer roller 1200 ) Due to the difference in the radius of curvature between the surface of the curved portion 11 and the surface of the curved portion 11, it is possible to suppress the occurrence of an excessively large space between them. Therefore, the printing material 30 is introduced into such a large space, it is possible to significantly suppress the generation and residual of air bubbles inside the printing material 30, the second printing layer 120 formed by fixing the printing material 30 ) Can also significantly suppress the generation and residual of air bubbles.

In addition, since the surface of the protruding portion 1210 and the surface of the curved portion 11 are in close contact with each other, bubbles generated in the printing material 30 interposed therebetween can be effectively escaped to the outside, so that the printing material 30 is The generation and residual of air bubbles in the adhered second printing layer 120 can be significantly suppressed.

On the other hand, it is suitable that the protrusion 1210 has a hardness of 10 or less, a height of 1 mm or less, and a width of 10 mm or less by a Type C durometer according to JIS K 6253.

When the printing layer 100 is formed by using the transfer roller 1210 having the protrusion 1210 having the above-described design value, it is possible to significantly suppress the generation and residual of air bubbles in the printing layer 100.

8 is a side view showing the transfer roller 1200 of another embodiment. Referring to FIG. 8, the transfer rollers 1200 are respectively provided in a circumferential direction, and may include a first region 1220 in which the protrusions 1210 are formed and a second region 1230 formed in a flat surface. have.

When the first printing layer 110 is formed on the flat portion 11, the first area 1220 of the transfer roller 1200 is brought into close contact with the flat portion 11, and the second printing layer is attached to the curved portion 12. In the case of forming 120, the second region 1230 of the transfer roller 1200 may be in close contact with the curved portion 12.

In an embodiment, when printing on the flat portion 11, by using the first area 1220 having a flat surface of the transfer roller 1200, the uniformity of the printing layer 100 printed on the first area 1220 When printing on the curved portion 12, the second area 1230 having the protrusion 1210 of the transfer roller 1200 is printed on the curved portion 12, so that the second portion is printed on the curved portion 12 The printing layer 120 can be easily and accurately formed and its uniformity can be increased.

The ratio of the first region 1220 and the second region 1230 may be variously set according to design values of the transfer roller 1200. In addition, the first region 1220 and the second region 1230 may be provided in plural, which are alternately arranged in the circumferential direction of the transfer roller 1200.

9 is a flow chart showing a printing method using the curved glass printing apparatus 1000 of one embodiment. The printing method may include a first printing step (S110) and a second printing step (S120).

In the first printing step (S110), the printing material 30 is attached to the surface of the flat portion 11 of the curved glass 10 using the transfer roller 1200 to form the first printing layer 110 in a flat form. Can.

In the second printing step (S120), the second printing layer 120 including the curved form is attached by attaching the printing material 30 to the surface of the curved portion 12 of the curved glass 10 using the transfer roller 1200. It can contain.

Meanwhile, as described above, the first printing layer 110 and the second printing layer 120 may be continuously formed, for example, the first printing layer 110 of the same material on the curved glass 10. And the second printing layer 120 may be continuously and integrally formed.

The first printing step (S110) may be performed first, followed by the second printing step (S120), and in another embodiment, the second printing step (S120) may be performed first and then the first printing step (S110). You can also proceed.

At this time, the transfer roller 1200 is formed with a projection 1210 having a shape corresponding to the curved portion 12 of the curved glass 10 on the surface, as described above, the projection 1210 is curved The second printing layer 120 can be easily and accurately formed on the curved portion 12 in close contact with the portion 12.

On the other hand, as described above, the transfer roller 1200 may be provided in the form shown in FIG. 4 in which the protrusions 1210 are radially arranged relative to the center of the transfer roller 1200 in one embodiment.

In another embodiment, the transfer roller 1200 is provided in the circumferential direction, respectively, as shown in FIG. 8, a first region 1220 formed of a flat surface and a second region formed of the protrusion 1210 It may include (1230). The structures provided as the first region 1220 and the second region 1230 are already described above, and thus descriptions thereof will be omitted.

In this case, the first printing layer 110 is formed by attaching the printing material 30 transferred to the first area 1220 to the flat portion 11 of the curved glass 10, and 2 The printing layer 120 may be formed by attaching the printing material 30 transferred to the second region 1230 to the curved portion 12 of the curved glass 10.

Although only a few are described as described above in connection with the embodiments, various other forms of implementation are possible. The technical contents of the above-described embodiments may be combined in various forms, unless the technologies are incompatible with each other, and may be implemented as a new embodiment.

100: printed layer
110: first printing layer
120: second printing layer
1000: curved glass printing device
1100: Pattern roller
1110: pattern
1200: Warrior roller
1201: rotating shaft
1210: protrusion
1220: Area 1
1230: Area 2
1250: core roll
1260: surface layer
1261: 1st floor
1262: 2nd floor
1300: transfer unit
1400: jig
1500: Blade
1600: printing material supply means
1700: Clean roller

Claims (8)

A pattern roller provided with grooves on the surface and formed with a pattern for receiving a printing material;
A transfer roller that contacts and rotates with the pattern roller to transfer the printing material from the pattern roller to the surface, and print the transferred printing material on the surface of the curved glass; And
It is provided to contact the surface of the pattern roller, and includes a blade that removes the printed material attached to the portion other than the pattern on the surface of the pattern roller as the pattern roller rotates,
The transfer roller,
A core roll coupled with a rotating shaft; And a surface layer of a flexible material formed by being laminated on the core roll,
The surface layer,
A first layer laminated on the core roll; And a second layer laminated on the first layer and having a higher hardness than the first layer.
A protrusion having a shape corresponding to the curved portion of the curved glass is formed on the surface of the second layer,
The protrusion,
The surface of the transfer roller is continuously formed with a constant width in the longitudinal direction of the transfer roller, and is provided in a plurality in a radial direction based on the center of the transfer roller, spaced apart from each other in a circumferential direction of the transfer roller. And is provided in plural,
The protruding portion is in the form of a convex curved section on the surface of the transfer roller, and the curved portion is a curved glass printing apparatus, characterized in that a part of a circle or a part of an ellipse. delete According to claim 1,
Curved glass printing apparatus, characterized in that the thickness of the first layer is larger than the thickness of the second layer. According to claim 1,
The second layer is a curved glass printing apparatus characterized in that the hardness is formed lower than the core roll. delete delete A pattern roller provided with grooves on the surface and formed with a pattern for receiving a printing material; A transfer roller that contacts and rotates with the pattern roller to transfer the printing material from the pattern roller to the surface, and print the transferred printing material on the surface of the curved glass; And a blade that is provided to contact the surface of the pattern roller and removes a printing material attached to a portion other than the pattern from the surface of the pattern roller as the pattern roller rotates.
The transfer roller,
A core roll coupled with a rotating shaft; A first layer laminated on the core roll; And a second layer laminated on the first layer and having a higher hardness than the first layer,
A protrusion having a shape corresponding to the curved portion of the curved glass is formed on the surface of the second layer,
The protrusion,
The surface of the transfer roller is continuously formed with a constant width in the longitudinal direction of the transfer roller, and is provided in a plurality in a radial direction based on the center of the transfer roller, spaced apart from each other in a circumferential direction of the transfer roller. And is provided in plural,
The protruding portion is in the form of a convex curved section on the surface of the transfer roller, and the curved portion is a curved glass printing apparatus, characterized in that a part of a circle or a part of an ellipse. The method of claim 7,
The thickness of the first layer is formed larger than the thickness of the second layer, the second layer is a curved glass printing apparatus characterized in that the hardness is formed lower than the core roll.

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