The following is the overall detection solution of social packaging printing quality:

First, the appearance inspection

Surface defects:

Use high-resolution industrial camera or manual visual inspection to check whether there are scratches, indentations, folds, bubbles, dirt and other defects on the packaging surface. For the packaging

with high gloss surface, it is easier to find defects under the illumination of a specific angle.

For minor scratches and indentations, an acceptable standard range can be set according to their length and depth. For example, scratches with a length less than 1mm and an inconspicuous depth can 

be regarded as secondary defects; Deep and long scratches are serious defects.

The area of bubbles and dirt should also be quantitatively evaluated. Bubbles with a diameter of less than 2mm or dirt with an area of less than 1cm² can be accepted within a certain range, and those

thatexceed it will be regarded as unqualified.

Flatness:

Put the package on a horizontal surface and observe whether it is flat or not. You can use a level or a simple ruler to measure the height difference of different parts.

For folding packaging, check whether the folding part is flat, tilted or irregular. The height difference at the fold should be controlled within a certain range, for example, not more than 0.5 mm.

Cutting accuracy:

Measure the edge cutting size of the package and compare it with the design size. The dimensional deviation should be controlled within a certain range, such as 1 mm.

Check whether the edge is neat, with or without burrs, jagged, etc. The length of burrs should not exceed 0.2 mm.

Second, color detection

Color accuracy:

Using spectrophotometer or color comparator, the printed package color is compared with the standard color sample. Ensure that the hue, saturation and lightness of the color are within the acceptable 

deviation range.

For brand packaging, color accuracy is particularly important, and color difference should be strictly controlled. For example, the color difference δ e value should be less than 3.

Color uniformity:

Measure the colors in different parts of the package to check whether the colors are evenly distributed. The color difference should be controlled within a certain range, such as δ e value less than 1.5.

For large-area single-color packaging, uniformity measuring instruments can be used for more accurate detection.

Third, text and pattern detection

Clarity:

Check whether the words and patterns on the package are legible through a magnifying glass or a high-resolution camera. The strokes of characters should be complete and sharp, and the lines of patterns should be smooth and fine.

Integrity:

Check whether the words and patterns are complete, and there are no problems such as missing, truncation and deformation. Especially for packaging with a specific logo or brand name, the integrity of the 

pattern is very important.

For multi-layer printed packaging, check the overprint accuracy between the patterns of each layer to ensure that there is no dislocation.

Fourth, overprinter accuracy detection

Use a microscope or high-precision measuring equipment to check the overprint accuracy between patterns or characters of different colors. Overprinting error should be controlled within a certain range, 

such as 0.1 mm.

For packaging with strict overprinter requirements, such as high-grade gift boxes, more accurate detection methods, such as laser interferometry, can be used.

Five, physical performance testing

Strength and durability:

Carry out compression resistance, impact resistance and tear resistance tests of the package to ensure that the package can protect the contents during transportation and storage.

For example, for carton packaging, the compressive strength test can be carried out, and it is required that it will not be deformed or broken under a certain pressure. For plastic packaging, drop ball impact 

test can be carried out to check its impact resistance.

Adhesion:

Check the adhesion of printing ink or coating on packaging materials. Tape sticking test or friction test can be used to ensure that the ink or coating will not fall off during normal use.

For packages with special coatings, such as waterproof and oil-proof coatings, corresponding performance tests should also be carried out.

Sixth, the overall effect evaluation

Compare the packaging sample with the standard sample or design draft, and evaluate whether the printing quality meets the requirements as a whole.

Considering the functionality, aesthetics and brand image transmission of packaging, the quality level of packaging is comprehensively judged.

For mass-produced packaging, sampling inspection can be carried out to ensure the stability of the overall quality.

Through the above comprehensive testing solutions, the quality of social packaging and printing can be effectively guaranteed, and the requirements of customers and the market can be met.