Plastic bottles made of polypropylene materials have low surface energy and poor affinity with inks. They are usually used for surface treatment after being processed by a flame treatment machine. The flame processor is composed of a conveyor belt, a tapered plunger, a flame nozzle and a gas tank. When in use, the plastic bottle is placed on the conical plunger, and the conveyor belt moves forward at a constant speed. Before the flame nozzle, the conical plunger starts to rotate, and at the same time, the bottle rotates, and the blue flame ablates the surface of the plastic bottle, thereby Improve the surface energy of plastic bottles and increase the adhesion to ink. The strength of the flame, the running speed of the conveyor belt, and the smoothness of the bottle when rotating, directly affect the processing effect, and the smoothness of the bottle rotation is the most critical. The smoothness is proportional to the size of the bottle. The shorter the bottle, the smaller the radius and the better the effect after treatment.
For larger bottles, we must take measures to increase its smoothness. A common method is to attach a nylon sleeve to the tapered post. The inner diameter of the sleeve is also tapered, and the outer diameter is the same as the size of the bottle. The set of bottles cannot be dropped by themselves and must be removed by hand.
Flame-treated plastic bottles should be printed immediately. Multi-color overprinting should be selected as photo-curing ink, and ordinary printing can use ordinary ink. Printing with ordinary ink, the color sequence interval should not exceed 6h, otherwise the surface of the plastic bottle can be reduced, it is easy to secondary dust, affecting the adhesion of the ink. For companies with smaller production units, printing in the second or third color, high-quality two-component inks can be used, and the effect is also good.
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