CN115008916A

CN115008916A - Screen printing process for 3D curved glass

Info

Publication number: CN115008916A
Application number: CN202210549510.9A
Authority: CN
Inventors: 吴建勇; 魏中凯; 陈志丁
Original assignee: Hefei Jinlonghao Technology Co ltd
Current assignee: Hefei Jinlonghao Technology Co ltd
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2022-09-06

Abstract

The invention provides a silk-screen printing process of 3D curved glass, which comprises the following steps: flattening the 3D curved glass, preparing a silk-screen printing plate with reduced tension, and performing silk-screen printing on the flattened 3D curved glass convex surface by using the silk-screen printing plate to form a printing ink layer. According to the 3D curved surface glass silk-screen printing process, after the 3D curved surface glass is flattened, the screen printing of the 3D curved surface glass is realized by controlling the tension of the screen printing plate, so that the printing cost is effectively reduced, phenomena of missing printing, uneven printing and the like are avoided, and the silk-screen printing effect can completely achieve the effect of exposure and development.

Description

Silk-screen printing process for 3D curved glass

Technical Field

The invention relates to the technical field of glass processing, in particular to a silk-screen process for 3D curved glass.

Background

The 3D glass is mainly used for a glass cover shell of a mobile phone, and is mainly compared with the traditional 2D glass and 2.5D glass. The 2D glass is traditional plane glass and does not have any arc design; the 2.5D glass is plane in the middle, but the edge is in an arc design, and is mainly formed by carving and hot bending of a die; and 3D glass adopts an arc design in the middle or at the edge.

The existing 3D mobile phone glass can only be realized through exposure and development; the exposure development mode is that the acid-resistant ink for exposure development is sprayed on the convex surface of the 3D glass, then the 3D glass is taken to the exposure machine to form an exposure line area, the exposure machine is taken out for development after exposure, and the ink in the unexposed area is cleaned and developed through a flat plate. Because the cost of the acid-resistant printing ink for exposure and development is 25 times that of silk-screen acid-resistant printing ink, and the cost of manpower is 3 times that of silk-screen acid-resistant printing ink, the method is not favorable for expanding production.

In contrast to the printing realized by exposure and development, the screen printing realizes the printing by extrusion of a scraper, so that the ink is transferred to a printing stock through meshes of the image-text part to form the image-text same as the original manuscript. Although the silk-screen printing equipment is simple, the operation is convenient, the printing and the plate making are simple, the cost is low, and the adaptability is strong, at present, the silk-screen printing is generally flat printing.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides the screen printing process for the 3D curved glass, the 3D curved glass is flattened, the screen printing of the 3D curved glass is realized by controlling the tension of the screen printing plate, the printing cost is effectively reduced, the phenomena of missing printing, uneven printing and the like are avoided, and the screen printing effect can completely achieve the effect of exposure and development.

The invention provides a silk-screen printing process of 3D curved glass, which comprises the following steps:

flattening the 3D curved glass, preparing a silk-screen printing plate with reduced tension, and performing silk-screen printing on the flattened 3D curved glass convex surface by using the silk-screen printing plate to form a printing ink layer.

Although the 3D curved glass is flattened to be beneficial to realizing the planar screen printing, the tension of a screen printing plate of the common planar glass is 18-22N, and the inventor finds that when the screen printing plate with the tension is directly adopted for printing, the printing effect cannot achieve the complete coverage of the whole convex surface of the 3D curved glass, and the screen printing plate has more flexibility by adjusting the tension of the screen printing plate to be small, so that the complete coverage printing of the convex surface of the 3D curved glass is effectively realized.

Preferably, the silk screen printing plate is prepared by adopting a film picture with the size matched with that of the flattened 3D curved glass.

Preferably, the tension of the silk-screen printing plate is 8-12N.

When the tension of silk screen printing plate was greater than 12N, the edge of 3D curved surface glass will not be printed to completely, but when the tension of silk screen printing plate was less than 8N, the whole effect on silk screen printing ink layer was relatively poor again, can not satisfy the printing requirement.

Preferably, the mesh number of the silk-screen printing plate is 300-350 meshes.

Preferably, the printing speed is 20-200mm/s, the ink returning speed is 200-500mm/s, and the scraping hardness is 50-85 degrees during silk-screen printing.

In order to adapt to the silk-screen effect of the silk-screen plate with the reduced tension, the printing speed is controlled to be 20-200mm/s, the ink returning speed is controlled to be 200-500mm/s, and the glue scraping hardness is controlled to be 50-85 degrees during silk-screen printing. .

Preferably, during silk-screen printing, a layer of acid-resistant ink layer is silk-screen printed, and then a layer of protective ink layer is silk-screen printed.

Preferably, the thickness of the acid-resistant ink layer is 8-12 μm, and the thickness of the protective ink layer is 14-20 μm.

Preferably, after silk-screening, baking and curing the ink layer.

Preferably, the temperature for baking and curing is 150-180 ℃, and the time is 30-40 min.

The invention also provides 3D curved glass, which is obtained by silk-screen printing the convex ink layer by using the silk-screen printing process.

The screen printing process for the 3D curved glass provided by the invention can effectively realize convex screen printing of the 3D curved glass, not only is the cost greatly reduced, but also the obtained ink layer is uniform in thickness, consistent in color, low in dirt ratio and clear in pattern, and can be adapted to 3D curved glass printing with various radians.

Drawings

FIG. 1 shows a 3D curved glass product after silk-screen printing.

Detailed Description

The technical solutions of the present invention are described in detail below by specific examples, but it should be clear that these examples are presented for illustration, but are not to be construed as limiting the scope of the present invention.

Referring to fig. 1, this embodiment provides a screen printing process for 3D curved glass, and the preparation method includes the following steps:

(1) tempering 3D curved glass (the height of a convex surface is 0.55cm, the curvature is 28 degrees), embedding the tempered glass into a base groove formed in an objective table of screen printing equipment, wherein the depth of the base groove is 0.01mm smaller than the thickness of the curved glass, and pumping out air in the base groove embedded with the 3D curved glass by using an air pumping system to form 0.4MPa negative pressure, so that the convex surface of the 3D curved glass is flattened and attached to the base groove in a planar manner;

(2) preparing a film picture according to the size of the flat plane of the 3D curved glass, manufacturing a silk-screen plate by using the film picture, wherein the number of the silk-screen plate is 350 meshes, and adjusting the tension of the silk-screen plate to be 10N;

(3) pressing the screen printing screen plate onto the convex surface of the 3D curved glass, scraping the printing ink with the screen printing screen plate pattern onto the convex surface of the 3D curved glass by using a scraper, wherein the printing speed is 100mm/s, the ink returning speed is controlled to be 300mm/s, the scraping hardness is controlled to be 70 degrees, the scraping pressure of the scraping ink is 2mm after the scraping ink contacts the glass surface, the scraping angle is controlled to be 45 degrees, so that a first layer of printing ink is formed on the 3D curved glass, after baking and curing, the printing ink layer is attached to the glass surface, the baking and curing temperature is 160-180 ℃, the time is 35min, and the thickness of the printing ink layer is 10 mu m; and repeating the process, continuously screen-printing a second layer of ink on the 3D curved glass, baking and curing to obtain a 3D curved glass product with the thickness of 16 microns.

As can be seen from fig. 1, the ink layer in the arc surface area of the obtained 3D curved glass product is printed perfectly, and the defects such as missing printing, uneven printing or color difference do not occur.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The silk-screen printing process of the 3D curved glass is characterized by comprising the following steps of:

and flattening the 3D curved glass, preparing a silk-screen printing plate with the tension adjusted to be small, and carrying out silk-screen printing on the flattened 3D curved glass convex surface by adopting the silk-screen printing plate to form a printing ink layer.

2. The screen printing process for 3D curved glass according to claim 1, wherein the screen printing plate is prepared by using a film figure with a size matched with that of the 3D curved glass after being flattened.

3. The screen printing process of 3D curved glass according to claim 1 or 2, wherein the tension of the screen printing plate is 8-12N.

4. The screen printing process for 3D curved glass according to any one of claims 1 to 3, wherein the mesh number of the screen printing plate is 300-350 meshes.

5. The screen printing process for 3D curved glass according to any one of claims 1 to 4, wherein the printing speed is 20 to 200mm/s, the ink returning speed is 200 and 500mm/s, and the scratch hardness is 50 to 85 degrees.

6. The process for screen printing 3D curved glass according to any one of claims 1 to 5, wherein an acid-resistant ink layer is screen printed before a protective ink layer is screen printed.

7. The screen printing process of 3D curved glass according to claim 6, wherein the thickness of the acid-resistant ink layer is 8-12 μm, and the thickness of the protective ink layer is 14-20 μm.

8. The process for screen printing the 3D curved glass according to any one of claims 1 to 7, further comprising baking and curing the ink layer after screen printing.

9. The screen printing process of 3D curved glass according to claim 8, wherein the baking and curing temperature is 150 ℃ and 180 ℃ and the time is 30-40 min.

10. 3D curved glass, characterized in that the convex ink layer is silk-screened by the silk-screening process according to any one of claims 1 to 9.