What common printing defects can be detected by the CCD visual inspection system of CCD screen printing machine?

The CCD visual inspection system of CCD screen printing machine can detect various common printing defects.

1、 Pattern position deviation detection

The accuracy of the pattern's position is crucial in the silk screen printing process. The CCD visual inspection system can accurately determine whether the printed pattern deviates from the preset position. For example, in the printing of electronic product casings, such as brand logos on phone cases, if there is a positional deviation, the appearance quality of the product will be seriously affected. The system can detect small horizontal and vertical deviations of the printed pattern by comparing its outline with a pre-set standard pattern position, with an accuracy of millimeters or even smaller.

2、 Pattern shape defect detection

It can recognize irregular changes in the shape of patterns. For example, for some patterns with complex geometric shapes, such as special graphic symbols in trademarks. If the pattern is deformed during the printing process due to factors such as screen deformation or uneven scraper pressure, the CCD system can detect it in a timely manner. It will match the shape features of the printed pattern with the standard template, and determine whether there are shape defects by calculating the similarity of shapes, such as circles turning into ellipses or corners of squares twisting.

3、 Color deviation detection

The accuracy of color is one of the key factors in printing quality. CCD visual inspection system can detect color deviation. It compares the actual printed color with preset standard color values (such as RGB or CMYK values) through spectral analysis of the printed color. In the field of packaging printing, for products such as food packaging and cosmetics packaging that require high color accuracy, this system can detect issues such as colors that are too dark, too light, or have color cast. For example, a brand logo that should have been bright red can be quickly detected if it appears to be biased towards orange or purple.

4、 Uneven detection of ink layer thickness

The uniformity of the ink layer during printing can also affect the printing quality. The CCD system can infer the thickness of the ink layer by measuring the intensity changes of the reflected light on the surface of the printed material. When the thickness of the ink layer is uneven, there will be differences in the intensity of reflected light. For example, in large areas of solid color printing, such as the background color part in poster printing, the system can detect areas where the ink layer is too thick or too thin, avoiding color variations and ensuring the visual consistency of the printed product.