When it comes to food bags, everyone must know that the food we eat in life will have a variety of outer packaging, which is called food packaging bags. Food bags include color-printed food bags, transparent food bags, high-temperature cooking food bags, etc. There are many kinds, so what are the reasons for the quality problems caused by the transparent vacuum food bag process that we usually use? Today, three-dimensional bag manufacturers will summarize the problems for the majority of users:They are: improper selection of adhesive, process problems, and substrate reasons. 1, Improper choice of adhesive.The adhesive itself is dark in color; the fluidity of the adhesive is insufficient, the flattening property is poor, and it cannot be fully spread on the base film. 2, Process problems. a.The inlet temperature of the drying tunnel is too high or there is no temperature gradient. The inlet temperature is too high and the drying is too fast, so that the solvent on the surface of the glue layer evaporates rapidly, and the surface is crusted. Then when the heat penetrates into the glue layer, the solvent gas under the film It melts, breaks through the glue film to form a ring like a volcanic vent, circle by circle, and also makes the glue layer opaque. b.The composite rubber roller or scraper is defective, and it cannot be pressed at a certain point, forming a gap and being opaque. c.There is too much dust in the ambient air, and there is dust in the hot air blown into the drying tunnel after gluing. Adhesive to the surface of the adhesive layer, sandwiched between two base films during compounding, there are many small spots, resulting in opacity. d.The amount of glue applied is insufficient, there are blank spaces, and small air bubbles are trapped, causing mottling or opacity. Check the amount of glue applied to make it sufficient and even. e.There is no rubber roller or the rubber roller is not clean. 3, Substrate reasons.The equipment packaging bag manufacturer tells you that the surface tension of the food packaging bag is not high, and the wettability of the glue to it is not enough. After drying, the film will be uneven, little by little, commonly known as”Masquerade”.