Another functional parameter of water-based coating - Smoothness

The Slippery Side of Water-based Coatings; functional properties of waterbased coatings.

"Smoothness" is another important parameter of paper water-based coating. It can play an important role in promoting or hindering related work, but it has been neglected for many years. In fact, it only has two standards: smooth or not smooth. From a technical point of view, it can be measured in terms of AOS, or the tangent of this angle, the so-called coefficient of friction (COF).

In general, the AOA is easier to understand. It has a direct connection with the exterior environment of the finished carton and carton coating. AOS can be further divided into dynamic decline angle (kAOS) and static decline angle (sAOS).

Static AOS is used to represent the frictional resistance that an item needs to overcome from rest to movement, while dynamic AOS is the amount of force required to maintain this state of motion after the object begins to move against static inertia.

We should have a deep understanding of AOS. We can see from the laboratory to real life. Imagine putting a box of drinks on a flat board and slowly putting one end of the board up to a certain height, at which point the drinks on the board slowly move. Measure the angle between the angled board and the plane. From this angle we call it the downslope angle, or AOS.

OK, continue our discussion. At this time, imagine the items on the conveyor belt, moving up and down. This is very important in the transmission of beverages, but it is also an indispensable and important exercise method in many filling lines.

The carton moves forward with the lift and begins to turn at the end of the process line. The most important determinant for keeping the drink moving along the conveyor line is the static fall angle (sAOS) of the carton, which The coating material on the surface of the box has a direct intrinsic connection.

If the application can be adjusted and applied to the AOS requirements of the product, the carton processing can be in a good working condition; if the coating is not done well, the following work cannot be done well.

With regard to the function of the dynamic decline angle (kAOS), we can embody the process of carton production. The first is the glue applicator, and the other is to put the carton under the filling machine and add the product to the box.

The value of AOS can vary greatly from low to high. The lower the value, the smaller the sliding angle, ie, the smoother the carton surface.

Experiments have shown that, if not specifically required, the typical coating static AOS values ​​are between 19 and 23 degrees. The carton of this numerical area can be kept smooth during production, and the mobility and stacking stability after loading the articles are all better. However, this does not mean that the carton also meets the user's requirements for dynamic kAOS.

In general, in order to increase work efficiency, the dynamic kAOS of the carton should preferably be coated with a medium-to-medium value, so that the transfer speed of the carton, the speed of charging by the linear applicator or the charging machine can be A substantial increase, which is very important for the modern high-speed food processing industry. Of course, there is a problem with too low a dynamic kAOS value. That is, when loading the carton into the applicator feeder, the carton often “slips out” of the feeding arm, especially the small box, the most obvious case.

If the dynamic kAOS of the coating material is well controlled, the work will be very beneficial. When you store, working hours will also be reduced. Sometimes the cartons are doing well, but the coating is not suitable, which is no good.

High-value kAOS also has a certain purpose. Some flat coating materials have dynamic kAOS of 30 to 40 degrees. Its main use is to increase the friction and keep the objects from sliding down for a period of time. This is particularly useful in beverage delivery, and can be seen elsewhere in the packaging industry.

Water-based coatings can add many functions to the carton, but none of them can be more important than the AOS function. Whether it is your own job requirements or products designed to increase productivity for your customers, increasing or reducing the downslide angle and increasing smoothness are the most important things. You must be careful to choose the water-based coating material. It is Your quest for maximum success.