Shrink film manufacturer: Reasons for black spots appearing on the surface of shrink film
Release Time:
2020-09-24
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Summary
Thermoforming Film Manufacturer The application is becoming increasingly common, and customers have higher and higher requirements for the product quality. Sometimes food thermoforming films may show black spots. To address this situation, one should first understand why black spots appear during the production of thermoforming films?
1. It may be due to the poor hiding power of the printing ink.
2. It may be because of poor leveling, causing uneven hiding, resulting in the color of the metallized film layer showing through the printing ink.
3. It may be that the thermoforming film manufacturer did not dry thoroughly, organic solvents did not evaporate sufficiently, and excessive residual organic solvents remain in the adhesive composition, causing some ink layers to dissolve and gloss unevenly, resulting in mottling.
4. It may be that the printing ink and adhesive are not compatible, causing poor adhesion of the adhesive to the printing ink, leading to resistance phenomena and mottling.
5. It may also be due to the low surface support strength of the printing ink, where the adhesion and solid layer density between the ink layer and the metallized film layer cause unevenness, visually resulting in milky white or dark gray mottling on the thermoforming film.
Select suitable food thermoforming films according to the product's attributes and characteristics. Packaging design does not mean that choosing a thermoforming film with high clarity and high price is better; suitability is what matters. If the product requirements are not very high, using high-quality thermoforming films is not only unsuitable but also leads to resource waste.
The choice of thermoforming packaging board is similar to selecting thermoforming films; higher quality is not always better. Currently, food thermoforming films can be made with built-in adhesiveness, so ordinary cardboard can be used. This simplifies the packaging process, reduces cardboard costs, and does not affect the packaging effect.
The quality of the thermoforming film manufacturer's automatic packaging machine directly affects the packaging effect. If the thermoforming machine heats unevenly, it will cause poor packaging results, increased product waste, and low efficiency. To achieve excellent packaging results, it is necessary to purchase a high-performance automatic packaging machine.
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