When dry compounding, annoying bubbles will appear on the composite film from time to time. There are many reasons. If the dry compound film has no air bubbles, first do the following:
1. Strengthen the detection of various raw and auxiliary materials (including films, inks, adhesives, various solvents, etc.), strictly control the quality, reduce the occurrence of bubbles and other failures in the composite film from the source, and improve the composite Membrane quality.
2. In actual production, appropriate printing inks and compound adhesives should be selected according to different printing processes, film types and characteristics, performance and requirements of packaging contents and subsequent processing conditions, and according to specific Adjust and control printing and compounding process parameters to ensure the quality of dry-type compounding film.
3. In daily operation, you must pay more attention to the tooling, and pay attention to the maintenance and maintenance of the tooling. Clean the tooling in time before driving and before and after parking. Adhesives or other contaminants on the surface of cloth rollers and rubber rollers to prevent these adhesives from drying and affecting the uniformity of the glue, thereby reducing the incidence of air bubbles.
In addition, the coating roller should be brushed repeatedly with a brush or a copper brush to remove the remaining adhesive in the cavity as thoroughly as possible to avoid clogging of the cavity and affect the amount of glue and the uniformity of the glue.
When storing the coating roller, the coating rubber roller and the composite rubber roller, they should be placed on a special support, and must not be placed directly on the ground to prevent scratches and affect the quality of the composite product. In addition, it is necessary to regularly check whether each roller is damaged, and if it is found, it should be replaced or repaired in time.
4. The temperature and humidity of the environment in the printing workshop should be kept relatively constant. If possible, air conditioning or dehumidification (humidification) and other devices can be installed. At the same time, we must pay attention to maintaining the sanitation of the warehouse and the workshop, and have good ventilation conditions to avoid foreign objects such as dust and sand particles from adversely affecting the composite process and the quality of the dry composite film.
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