Six key tips for producing high-quality packaging bags!

This article summarizes some tips for producing packaging bags, such as ink mixing techniques, printing plate safety tips, and curing judgment tips, etc. It helps manufacturers better understand how high-quality packaging bags are produced during ordering.

I. Ink Mixing Tips

1. Add the ink of the missing hue. For example, if the orange ink visually lacks red, a small amount of red can be added.

2. When removing an excessive hue, the principle of complementary colors should be correctly applied. In production practice, sometimes in order to make white whiter, a small amount of Prussian blue (about 1%) is added to the white ink to eliminate the yellow in the white, thus achieving the purpose; and by adding a small amount of titanium blue to the black ink, the yellow tone in the black ink can be eliminated.

3. When making light-colored inks, add colored inks to the white ink, and do not add white ink to the colored ink. The white ink has a very strong covering power, and adding too much will quickly dilute the color; when preparing dark-colored inks, be sure to add black ink to the colored ink, and never add colored ink to the black ink, because the black ink has a very strong coloring power, and if too much is added carelessly, a considerable amount of colored ink will need to be added to adjust the color.

4. When observing color samples, it is best to do so under standard light sources and use the same backing board.

II. Printing Plate Installation Tips

1. Check the mesh lines and plate surface to ensure there are no bumps, scratches, or chrome loss. Pay attention to the installation direction and position, ensuring that the longitudinal alignment is basically correct.

2. During plate installation, pay special attention to checking the cleanliness of the inside of the cover and the plug to prevent assembly errors caused by foreign objects. Handle with care to avoid damaging the plate surface.

3. Run at low speed to check if the plate roller is eccentric, which is an imbalance phenomenon caused by assembly errors.

III. Manual Addressing Tips

When the color markers are arranged vertically in reverse order, select the leftmost set of signals; when the color markers are arranged vertically in reverse order, select the rightmost set of signals.

IV. Curing Judgment Tips

1. Curing time refers to continuous curing time, not the cumulative time after intermittent curing. Generally, it is not necessary to wait for the main agent and curing agent to react completely before curing. However, some emergency production retort pouches, which the customer needs immediately, require complete curing. Although the peel strength of packaging bags produced in these two ways is not much different, the temperature resistance and corrosion resistance are very different.

2. Based on the state of the adhesive after complete curing, it can be judged whether the ratio of curing agent and main agent is appropriate. If the adhesive is in a non-dry state, it indicates that the content of the curing agent is too low. If the adhesive is hard and brittle, it indicates that the content of the curing agent is too high.

V. Tips for Checking Whether the Tension Is Matched During Lamination

Stop the machine during lamination and use a blade to make a cross-cut on the laminated film at the winding point. The ideal state is that the laminated film remains flat after the cut. If the laminated film curls in one direction, it indicates that the tension of that layer of film is too high, and the tension of that layer of film should be appropriately reduced or the tension of the other layer of film should be increased.

VI. Tips for Setting Heat Sealing Temperature During Bag Making

When setting the heat sealing temperature, it is also necessary to consider the influence of factors such as the thickness of the heat sealing film, the heat sealing cloth, and different composite materials. For example, the heat sealing temperature of a single-layer PE80 film is 120℃, the general heat sealing cloth blocks the temperature by about 40-60℃, PET12/A17 blocks the temperature by 20℃, and NY15 blocks the temperature by 15℃. That is, due to the influence of the material structure and heat sealing cloth, the final heat sealing temperature of PET12/A17/PE80 is set to 185℃, and the heat sealing temperature of NY15/PE80 is 180℃.

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