Barcode printing technology solution for plastic packaging (2)

Second, the problem should pay attention to the printing process

According to the above technical requirements of barcode printing, the following issues regarding the printing process should be analyzed, including design, plate making, printing, compounding, and packaging methods.

(a) design

1. Barcode position design

The position of the bar code should be considered in the actual position after the actual object is loaded (while the bar code of the transparent package cannot be displayed simultaneously with the bar code on the individual retail goods installed inside), and whether the design is reasonable or not will directly affect the actual reading effect. For bread, candy, bagged food, etc., the bar code position should generally be selected in the following order: bottom, back, side, but not in the bending, partition, corner position. For cylindrical, trilateral sealing, back sealing bags, generally selected on the back and pay attention to avoid heat-sealing parts and empty parts; for pillow-shaped packaging bags should be determined after the actual position of the packaging, to avoid the corner position.

For surface bar codes, the surface curvature must not exceed 30°.

2. Size design

The bar code size refers to the size of the left and right blank area including the bar code symbol. In general, the barcode magnification factor is proportional to the allowable dimensional deviation of the barcode printing. Magnification is generally controlled between 0.8 and 2.

In order to ensure the correct reading of barcodes, there should be a blank area with a certain width around the barcode. The size of the blank area varies depending on the type of barcode, at least 10 times the minimum strip width. According to GB12904-91 “General Product Bar Code”, the minimum width of left and right blank areas is 3.63mm and 2.31mm, respectively, when the magnification factor is 1.0. For best scanning results, generally The size of the blank area should not be less than 5mm wide.
In order to ensure that bar code reading does not affect the bar code reading success rate due to the height of the bar code, general bar code symbol may not be arbitrarily shortened. When it is really necessary to shorten the time, it should comply with the corresponding technical specifications.

3. Color design

Color design must ensure a certain degree of contrast. Different colors have different reflectivity to light, in which black is not reflective to visible light of various wavelengths, but white can reflect light of various wavelengths, so black bars are the best design. The following table shows the matching of some colors.

Barcode color matching

No. Underline color energy/No
1 white black energy
2 white blue energy
3 white green energy
4 white dark brown energy
5 white yellow no
6 White Orange No
7 White Red No
8 white light brown no
9 white gold no
10 Orange Black Energy
11 orange blue energy
12 Orange Green Energy
13 orange dark brown energy
14 red black energy
15 red blue energy
16 Red Green Energy
17 red dark brown energy
18 yellow black energy
19 yellow blue energy
20 yellow green energy
21 yellow dark brown energy
22 bright green red
23 bright green and black
24 dark green and black
25 Blue Red No
27 Blue Black No
28 Gold Black No

At the same time, the effect of composite aluminum foil or aluminized film on hue should be considered. Aluminum foil and other specular reflection, the reader can not collect reflected light, the smallest reflectance, can be used as a strip color. The empty color must print white, yellow, orange, or red on the aluminum foil. This is called reverse printing. Some plastic packaging does not print the background color (empty color) but only the strip color when printing the barcode, and uses the color of the content itself as the blank color. This method is not suitable. For example, the hot sauce package bag, if using the sauce color to empty the bag, the reflectivity is low. The contrast does not form enough to affect reading.

Plastic film has a certain degree of gloss. For composite barcodes, its gloss will change the reflectivity of the strip and the space, causing a contrast change. Therefore, when designing a color, this factor should be taken into consideration to leave a certain margin for the contrast. .

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