CN115618792A - Method for evaluating precision of chip resistor screen printing system - Google Patents

Abstract

The invention provides a method for evaluating the precision of a chip resistor screen printing system, which comprises the following steps: 1. setting resolution recognition patterns at four corners of the standard screen printing plate, and setting resistance patterns with various sizes at the four corners and the middle position of the standard screen printing plate; 2. using the standard screen printing in a printing system to be evaluated, and detecting a resolution recognition graph and a resistance graph printed on a substrate; 3. identifying the integrity of the pattern according to the printed resolution, and judging the printability of the system and the dimensional accuracy of the printable product; 4. judging the precision of the resistor printing process according to the area difference of the printed resistor patterns; 5. and integrating the judgment results of 3 and 4 to judge the precision level of the whole system. The invention has the advantages of maintaining the equipment abnormality in advance or judging the capability of producing products with different sizes by the equipment through the evaluation result and the like.

Description

A Method for Evaluating the Precision of Chip Resistor Screen Printing System

technical field

The invention relates to the field of screen printing, in particular to a method for evaluating the accuracy of a chip resistor screen printing system.

Background technique

Screen printing belongs to stencil printing, and it is called the four major printing methods together with offset printing, embossing printing, and gravure printing. Stencil printing includes transcription, engraving, inkjet and screen printing. The principle of stencil printing is: when the printing plate (the hole that can pass the ink is made on the base of the paper film plate or other plates), when printing, the ink is transferred to the substrate (paper, ceramics, etc.) through the holes of the stencil through a certain pressure. ) to form an image or text. With the current mass-produced stencil, there is no effective method to accurately evaluate the screen printing equipment; it is impossible to quantitatively and qualitatively verify the accuracy of the equipment calibrated by the equipment manufacturer; it is impossible to monitor the accuracy of the equipment in the use environment.

Therefore, it is necessary to provide a new technical solution.

Contents of the invention

In order to solve the technical problems existing in the prior art, the present invention discloses a method for evaluating the accuracy of the chip resistor screen printing system. The specific technical solution is as follows:

The invention provides a method for evaluating the accuracy of a chip resistor screen printing system, comprising the following steps:

S1. Set a standard screen, set resolution identification graphics at the four corners of the standard screen, and set resistance patterns of various sizes at the four corners and middle positions of the standard screen, and the resistance patterns avoid the substrate corresponding to the largest size product Dividing line;

S2. Cooperate with fixed-viscosity ink on the screen printing equipment, and select the substrate corresponding to the largest size product among the above-mentioned multiple sizes for resistance process printing;

S3. Take out the sample after printing, and detect the resolution identification pattern and the resistance pattern printed on the substrate respectively;

S4. Identify the completeness of the graphics based on the resolution printed on the substrate, determine the printability of the system and the range of printable product sizes corresponding to the resistance process;

S5. According to the difference in the area of the resistance pattern printed on the substrate around and in the middle, determine the size range of the printable product corresponding to the resistance process of the system;

S6. Combining the determination results of S4 and S5 to determine the accuracy of the entire screen printing system.

Further, the resolution identification graphics include various sizes from small to large.

Furthermore, the resolution identification figure includes four rectangular figures of size A, B, C and D, which respectively represent four different ranges of 10um, 30um, 50um and 80um.

Further, judge the printable product size range of the resistance process according to the appearance integrity of the resolution recognition pattern observed under the microscope:

When all the graphics of A are printed out, the resistance process of products with a size below 10um can be printed;

When the B graphics are all printed and the A graphics are partially printed, the resistance process of 10um-30um size products can be printed;

When C graphics are all printed and B graphics are partially printed, the resistance process of 30um~50um size products can be printed;

When the D graphics are all printed and the C graphics are partially printed, the resistance process of products with a size of 50um to 80um can be printed;

When part of the D graphics is printed out, the printability of the printing system is too low, the ink screen does not match, and the system is unusable.

Further, in the four corners and the middle five resistance pattern areas printed on the substrate, respectively detect the area of a certain number of resistance patterns of the same size, calculate the average value to represent the area value of the resistance pattern, and then calculate all the resistance patterns of the same size The change difference between the largest area and the smallest area, when the area change difference is less than 10% of the average value of all resistance patterns of the same size in five positions, it is determined that the system can print the resistance process of the resistor of this size and above.

Further, the determination results of steps S4 and S5 are both necessary conditions, and only when the determination results of S4 and S5 are satisfied at the same time, can the size range of the printable product of the resistance manufacturing process of the system be determined.

Further, according to the size range of the printable product of the resistance process determined in steps S4 and S5, the accuracy level of the entire system is the lower precision level.

The present invention has the following beneficial effects: the present invention designs and manufactures standard screens with different sizes of resolution identification graphics and resistance graphics, and prints on different screen printing equipment with inks of uniform viscosity, and can be identified by the resolution after printing. Graphics and resistance patterns evaluate the printability, resolution, and system accuracy of the printing system. Pre-judgments can be made before screen equipment, inks, and screens are put into use or before process changes. Through the evaluation results, equipment abnormalities can be maintained or products with different grades can be produced.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

detailed description

In order to further illustrate the technical means adopted by the present invention and the technical effects achieved, the following will be described in detail in conjunction with the examples.

The invention discloses a method for evaluating the accuracy of a chip resistor screen printing system, which includes the following steps:

S1. Set a standard screen, set resolution identification graphics at the four corners of the standard screen, and set resistance patterns of various sizes at the four corners and middle positions of the standard screen, and the resistance patterns avoid the substrate corresponding to the largest size product Dividing line;

S2. Cooperate with fixed-viscosity ink on the screen printing equipment, and select the substrate corresponding to the largest size product among the above-mentioned multiple sizes for resistance process printing;

S3. Take out the sample after printing, and detect the resolution identification pattern and the resistance pattern printed on the substrate respectively;

S4. Identify the completeness of the graphics based on the resolution printed on the substrate, determine the printability of the system and the range of printable product sizes corresponding to the resistance process;

S5. According to the difference in the area of the resistance pattern printed on the substrate around and in the middle, determine the size range of the printable product corresponding to the resistance process of the system;

S6. Combining the determination results of S4 and S5 to determine the accuracy of the entire screen printing system.

The resolution identification graphics include various sizes from small to large.

In one embodiment, the resolution identification figure includes four rectangular figures of size A, B, C and D, which respectively represent four different ranges of 10um, 30um, 50um and 80um.

Judging the printable product size range of the resistance process according to the appearance integrity of the resolution recognition pattern observed under the microscope:

When all the graphics of A are printed out, the resistance process of products with a size below 10um can be printed;

When the B graphics are all printed and the A graphics are partially printed, the resistance process of 10um-30um size products can be printed;

When C graphics are all printed and B graphics are partially printed, the resistance process of 30um~50um size products can be printed;

When the D graphics are all printed and the C graphics are partially printed, the resistance process of products with a size of 50um to 80um can be printed;

When part of the D graphics is printed out, the printability of the printing system is too low, the ink screen does not match, and the system is unusable.

In the four corners and the middle five resistance pattern areas printed on the substrate, respectively detect the area of a certain number of resistance patterns of the same size, calculate the average value to represent the area value of the resistance pattern, and then calculate the largest area among all the resistance patterns of the same size and the minimum area change difference, when the area change difference is less than 10% of the average value of all resistance patterns of the same size at five positions, it is determined that the system can print the resistance process of the resistor of this size and above.

The determination results of steps S4 and S5 are both necessary conditions, and only when the determination results of S4 and S5 are satisfied at the same time, can the size range of the printable product of the resistance manufacturing process of the system be determined.

According to the size range of the printable product of the resistance process determined in steps S4 and S5, the accuracy level of the entire system is the lower precision level.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples" or "some examples" mean specific features described in connection with the embodiment or example, A structure, material or characteristic is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Also, those skilled in the art can combine and combine different embodiments or examples described in this specification.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to alterations, modifications and variations.

Claims (7)

1. A method for evaluating the accuracy of chip resistor screen printing system, characterized in that, comprising the steps: S1. Set a standard screen, set resolution identification graphics at the four corners of the standard screen, and set resistance patterns of various sizes at the four corners and middle positions of the standard screen, and the resistance patterns avoid the substrate corresponding to the largest size product Dividing line; S2. Cooperate with fixed-viscosity ink on the screen printing equipment, and select the substrate corresponding to the largest size product among the above-mentioned multiple sizes for resistance process printing; S3. Take out the sample after printing, and detect the resolution identification pattern and the resistance pattern printed on the substrate respectively; S4. Identify the completeness of the graphics based on the resolution printed on the substrate, determine the printability of the system and the range of printable product sizes corresponding to the resistance process; S5. According to the difference in the area of the resistance pattern printed on the substrate around and in the middle, determine the size range of the printable product corresponding to the resistance process of the system; S6. Combining the determination results of S4 and S5 to determine the accuracy of the entire screen printing system. 2. The method for evaluating the accuracy of the chip resistor screen printing system according to claim 1, wherein the resolution identification graphics include various sizes from small to large. 3. The method for evaluating the accuracy of the chip resistor screen printing system according to claim 2, characterized in that, the four-size rectangular figures of the resolution identification figures A, B, C, and D represent 10um and 30um respectively , 50um and 80um four different ranges. 4. The method for evaluating the accuracy of the chip resistor screen printing system according to claim 3, characterized in that, the size range of the printable product of the resistance process is judged according to the appearance integrity of the resolution recognition pattern observed under a microscope: When all the graphics of A are printed out, the resistance process of products with a size below 10um can be printed; When the B graphics are all printed and the A graphics are partially printed, the resistance process of 10um-30um size products can be printed; When C graphics are all printed and B graphics are partially printed, the resistance process of 30um~50um size products can be printed; When the D graphics are all printed and the C graphics are partially printed, the resistance process of products with a size of 50um to 80um can be printed; When part of the D graphics is printed out, the printability of the printing system is too low, the ink screen does not match, and the system is unusable. 5. the method for evaluating the accuracy of the chip resistor screen printing system according to claim 1, characterized in that, the four corners and the middle 5 resistance pattern areas printed on the substrate detect the resistance pattern of a certain number of the same size respectively. Area, calculate the average value to represent the area value of the resistance pattern, and then calculate the change difference between the maximum area and the minimum area in all resistance patterns of the same size, when the difference in area change is less than 10% of the average value of all resistance patterns of the same size in five positions When, it is determined that the system can print the resistance process of resistors of this size and above. 6. The method for evaluating the precision of chip resistor screen printing system according to claim 1, characterized in that, the judgment results of steps S4 and S5 are all necessary conditions, and only if the judgment results of S4 and S5 are satisfied simultaneously, can it be judged that The range of printable product sizes for the system resistance process. 7. The method for evaluating the accuracy of the chip resistor screen printing system according to claim 6, characterized in that, according to the scope of the size of the printable product of the resistance process determined in steps S4 and S5, the lower accuracy level is the whole The accuracy class of the system.