TWI580583B - A screen structure and its manufacturing method - Google Patents

Description

Screen structure and manufacturing method thereof

The present invention relates to a screen structure and a method of manufacturing the same, and more particularly to a screen structure and a method of manufacturing the same that can enhance the strength of the screen, improve the adhesion between the emulsion and the web, and improve the amount of ink on the screen.

The screen structure is an important tool for screen printing, and it can also be said to be an important basis for screen printing. It is mainly made of Tedron fiber, nylon fiber or metal mesh cloth, which is cross-woven in the warp and weft directions. A certain tension is opened and fixed on a frame. In addition to forming the pattern, the screen version also controls the amount of ink that is transmitted during screen printing; therefore, the screen structure has a very large influence on the precision of printing, the thickness of the ink, and the amount of ink permeation. .

The manufacturing principle of the screen structure is to perform photosensitive plate making by using the chemical reaction of the emulsion on the ultraviolet light and the mesh formed by the warp and weft of the screen, so that the non-printed portion is blocked by light and blocks the mesh. In the printed part, the emulsion is not chemically reacted, and it dissolves and empties when it is in contact with water, thereby forming a pattern required for printing. When screen printing is performed, the operator can apply pressure by the doctor blade to scrape the ink, so that the ink is printed on the printed matter through the hollow mesh to achieve the printing purpose.

However, in the conventional screen structure, as shown in the fifth figure, since the surface of the warp and the weft is a smooth surface, the adhesion between the emulsion and the warp and weft may be insufficient, and the emulsion may easily occur when the web is stretched. When the latitude and longitude lines fall off, the number of times of printing on the screen is limited. In addition, when the emulsion and the warp and weft are detached, the structure of the screen is damaged, which not only affects the precision of printing, but also causes distortion of the printed pattern.

For the above reasons, it is a primary object of the present invention to provide a screen structure which increases the adhesion between the emulsion by increasing the surface area of contact between the emulsion and the warp and weft.

Another object of the present invention is to provide a screen manufacturing method which destroys the structure of the warp and weft by means of erosion, thereby forming a plurality of recesses on the warp and weft to increase the surface area of contact between the emulsion and the warp and weft.

It is still another object of the present invention to provide a screen structure in which an emulsion layer is added on both sides of the screen to improve the amount of ink under the screen.

To achieve the foregoing objects, the present invention provides a screen structure comprising: a mesh layer and a first emulsion layer. The mesh layer is formed by interlacing a plurality of warp threads and a plurality of weft threads, and has irregular plurality of concave portions on the warp and the weft. The first emulsion layer coats the mesh layer and is tightly bonded to the recesses. The first emulsion layer has a first side and a second side, and a plurality of openings are formed on the first emulsion layer.

According to an embodiment of the invention, a second emulsion layer is disposed on each side of each opening on the first side of the first emulsion layer.

In accordance with an embodiment of the invention, a third emulsion layer is disposed on each side of each opening on the second side of the first emulsion layer.

In addition, the present invention provides a screen manufacturing method, which comprises the following steps: a web step of interlacing a plurality of warp threads and a plurality of weft threads into a mesh layer, pulling them apart by one force, and fixing them to a net. a degreasing step of immersing the mesh layer in an aggressive compound to remove grease from the warp and weft threads, and simultaneously forming irregular plurality of recesses on the warp and weft; a coating step Applying an emulsion to the mesh layer by using a scraping groove; in an exposure step, placing a negative film having a predetermined pattern between the mesh layer and an ultraviolet light source, and irradiating the mesh layer through the ultraviolet light source to The emulsion is cured to thereby form a screen; and, in an imaging step, the screen is rinsed with water to dissolve the uncured emulsion while forming a plurality of openings in the screen.

According to an embodiment of the invention, the screen manufacturing method further comprises the step of performing the coating step, the exposing step, and the developing step described above on one of the first sides of the screen.

According to an embodiment of the invention, the screen manufacturing method further comprises the step of performing the coating step, the exposing step, and the developing step described above on one of the second sides of the screen.

According to an embodiment of the invention, the compound may be monohydroxyic acid or citric acid.

100‧‧‧Web structure

10‧‧‧ mesh layer

103‧‧‧ recess

30‧‧‧First emulsion layer

301‧‧‧Scrape face

302‧‧‧Printing surface

305‧‧‧ openings

32‧‧‧Second emulsion layer

33‧‧‧ third emulsion layer

S41‧‧‧ Network Steps

S42‧‧‧ Degreasing step

S43‧‧‧ Coating step

S44‧‧‧Exposure step

S45‧‧‧ imaging steps

1 is a side cross-sectional view showing a screen structure according to a preferred embodiment of the present invention; and a second side view is a side cross-sectional view showing a screen structure according to another embodiment of the present invention; A side cross-sectional view showing a screen structure according to still another embodiment of the present invention; a fourth diagram showing a flow chart of a method for manufacturing a screen according to a preferred embodiment of the present invention; and a fifth figure showing a conventional mesh A photo of the surface of the middle and longitude lines.

The implementation of the present invention will be described in more detail below with reference to the drawings and component symbols, so that those skilled in the art can implement the present specification after studying the present specification.

The first figure is a side cross-sectional view showing a screen structure in accordance with a preferred embodiment of the present invention. As shown in the first figure, the screen structure 100 provided by the present invention comprises a mesh layer 10 and a first emulsion layer 30. The mesh layer 10 is formed by interlacing a plurality of warp threads and a plurality of weft threads, and has a warp and a weft. An irregular plurality of recesses 103. The first emulsion layer 30 coats the mesh layer 10 and is tightly bonded to the recesses 103. The first emulsion layer 30 has a first side and a second side, and a plurality of openings 305 are formed on the first emulsion layer 30. Here, the first side of the first emulsion layer 30 has a doctor blade surface 301, and the second side of the first emulsion layer has a bonding surface 302.

In the screen structure 100 as described above, the printing surface 302 is first attached to a substrate (not shown) when printing. Next, the operator applies a printing material such as ink or slurry on the blade surface 301, and then presses the printing material on the blade surface 301 with a doctor blade to thereby apply the printing material to the object to be printed through the plurality of openings 305. on. Through the above steps, the operator can use the screen structure 100 to print a pattern on the object to be printed to achieve the purpose of printing.

The present invention increases the surface area of the mesh layer 10 by providing a plurality of recesses 103 on the mesh layer 10, so that the contact area between the first emulsion layer 30 and the mesh layer 10 can be increased, thereby enhancing The adhesion of the first emulsion layer 30 to the mesh layer 10 is good. The method of providing the mesh layer 10 to the plurality of recesses 103 will be additionally described below.

The second figure shows a side cross-sectional view of a screen structure in accordance with another embodiment of the present invention. In another embodiment of the invention, the screen structure is substantially the same as the screen structure 100 in accordance with the preferred embodiment of the present invention. The screen structure as shown in the second embodiment differs from the preferred embodiment in that a second emulsion layer 32 is disposed on each side of each opening 305 on a first side of the first emulsion layer 30.

By the arrangement of the second emulsion layer 32, the doctor blade surface 301 of the screen structure can be more wet and smooth, so that the probability of ink residue applied to the blade surface 301 can be reduced, so that the ink passes through the opening more smoothly. 305 is smeared onto the printed matter.

The third figure shows a side cross-sectional view of a screen structure in accordance with yet another embodiment of the present invention. The screen structure as shown in the third embodiment differs from the preferred embodiment in that a third emulsion layer 33 is disposed on each side of each opening 305 on the second side of the first emulsion layer 30.

By the arrangement of the third emulsion layer 33, both sides of the opening 305 can be increased The distance between the print surface 302 and the mesh layer 30. As a result, the amount of ink that can pass through the opening 305 is increased, in other words, the thickness of the ink printed on the object to be printed can be increased.

Those who are familiar with the field of screen printing can combine the screen layouts in the second and third diagrams according to the requirements, so as to improve the problem of insufficient ink volume in the conventional screen layout.

Hereinafter, a method of manufacturing a screen structure according to a preferred embodiment of the present invention will be described in detail.

The fourth figure shows a flow chart of a method for manufacturing a screen according to a preferred embodiment of the present invention. As shown in the fourth figure, in the screen manufacturing method provided by the present invention, first, a net step S41 is executed. In the netting step S41, a plurality of warp threads and a plurality of weft threads are interlaced into a mesh layer, and then pulled apart by a force, and fixed on a frame.

Next, a degreasing step S42 is performed. In the degreasing step, the mesh layer is immersed in an aggressive compound to remove grease on the warp and weft threads, and at the same time, irregular grooves are formed on the warp and weft. The compound used in the preferred embodiment of the present invention is monohydroxylic acid or citric acid; however, any other compound having the same function belongs to the present invention. In the scope of protection. Figure 2 is a photograph showing the surface of the warp and weft having a plurality of irregular recesses after the degreasing step S42 is completed. As shown in Figure 2, by the erosive properties of hydroxysuccinic acid or hydroxypropanetricarboxylic acid, not only the grease remaining on the warp and weft threads can be removed to prevent the oil from affecting the bonding of the emulsion with the warp and weft, but also by the warp and weft. A recess is formed in the line to increase the contact area between the warp and weft and the emulsion, thereby increasing the adhesion between the emulsion and the latitude and longitude.

After the degreasing step S42 is completed, a coating step S43 is performed. In the coating step S43, the emulsion is applied to the mesh layer using a doctor blade. Next, an exposure step S44 is performed to place a negative film having a predetermined pattern between the mesh layer and an ultraviolet light source, and irradiate the mesh layer through the ultraviolet light source to cure the emulsion, thereby forming a screen. Since the predetermined pattern on the film prevents the ultraviolet light source from being irradiated to the emulsion at a specific position, part of the emulsion on the screen is not cured. Finally, a developing step S45 is performed to rinse the screen with fresh water to dissolve the uncured emulsion while forming a plurality of openings in the screen.

When the operator needs to manufacture the screen structure as shown in the second figure or the third figure, it is only necessary to repeat the coating step S43, the exposure step S44, and the developing step S45 on the side where the screen layer needs to be added with the emulsion layer. That is, a screen structure as shown in the second or third figure can be obtained. As a result, those skilled in the art can select the location and number of additional emulsion layers as desired.

The above description of the embodiments of the present invention and the application examples thereof are not intended to limit the scope of the present invention, and any improvement and variation that can be accomplished by those skilled in the art based on the contents of the present invention should be considered. It is intended to be included within the scope of the appended claims. Any equivalent structure that is achieved by the use of the contents of the present invention and the accompanying drawings, whether directly or indirectly applied to the art or other related art, is considered to be within the scope of the present invention.

S41‧‧‧ Network Steps

S42‧‧‧ Degreasing step

S43‧‧‧ Coating step

S44‧‧‧Exposure step

S45‧‧‧ imaging steps

Claims (8)

A screen structure comprising: a mesh layer, which is formed by interlacing a plurality of warp threads and a plurality of weft threads, and the warp threads and the weft threads have irregular plurality of concave portions; a first emulsion layer, The mesh layer is coated and tightly bonded to the recesses, wherein the first emulsion layer has a first side and a second side, and the first emulsion layer is formed with a plurality of openings. A screen structure according to the first aspect of the patent application, wherein a first emulsion layer is disposed on each side of each of the openings on the first side of the first emulsion layer. A screen structure according to the first aspect of the invention, wherein a third emulsion layer is disposed on each side of each of the openings on the second side of the first emulsion layer. A screen manufacturing method, comprising the following steps: a web step of interlacing a plurality of warp threads and a plurality of weft threads into a mesh layer, pulling them apart by one force, and fixing them on a frame; a degreasing step Soaking the mesh layer in an aggressive compound to remove grease from the warp threads and the weft threads, and simultaneously forming irregular plurality of recesses on the warp and weft threads; a step of applying an emulsion to the mesh layer by using a scraping groove; in an exposure step, placing a negative film having a predetermined pattern between the mesh layer and an ultraviolet light source, and irradiating through the ultraviolet light source The mesh layer is used to cure the emulsion to form a screen; In a developing step, the screen is rinsed with water to dissolve the uncured emulsion while forming a plurality of openings in the screen. The screen manufacturing method according to the fourth aspect of the patent application, further comprising the step of performing the coating step, the exposing step, and the developing step on a first side of the screen. The screen manufacturing method according to the fourth aspect of the patent application, further comprising the step of performing the coating step, the exposing step, and the developing step on a second side of the screen. A screen manufacturing method according to the fourth aspect of the invention, wherein the compound is monohydroxy acid. A screen manufacturing method according to claim 4, wherein the compound is citric acid.