Die-cutting flying label is a common problem in the daily production of self-adhesive label die cutting. Die-cutting flying label refers to the phenomenon in which die-cutting material has been completely cut off but the side of labels is pulled up by the waste discharge. This phenomenon will bring a greater impact on the follow-up work. The main reasons for die-cutting flying labels are as below:
Reason 1: The fluidity of the glue is too strong. Generally speaking, if the fluidity of the glue is strong, the initial viscosity of the self-adhesive material will be strong, giving people the feeling that it feels sticky. However, the glue of such self-adhesive materials is easier to flow back after die-cutting. However, if the fluidity of the glue is too strong, the glue that has been cut will flow back together before the waste is discharged after die-cutting, forming glue drawing. This kind of glue drawing sticks the two sides of the material that has been cut together, so it is easy to cause the label to be picked up by the side of the waste when it is discharged.
If the fluidity of the glue is too strong,
you can try the following methods: (1) Wrap a piece of cotton cloth on an iron
plate, pour gasoline or other solvents on it, and place it in front of the
waste discharge station of the label die-cutting machine. The purpose is to dissolve
the glue filament with a solvent before waste discharge. After the glue thread
is dissolved, the work of the waste discharge will be smooth, and the label
will not be carried by the waste discharge side. (2) Use a hot fan to blow the
surface of the material. The purpose is to soften the glue quickly. When the
glue softens to a certain extent, the drawing will be easy to break, and it
will not be easy to pull the label up.
Reason 2: waste
discharge angle is too small. When discharging waste, an angle will be formed
between the waste discharge edge and the material, which we call the waste
discharge angle. If the angle is too small, it is easy to cause the label to be
picked up by the waste edge, especially for small label. This is the reason
that the area of the label is small, and the binding
force between the label itself and the backing paper will be very light. If the
waste discharge angle is also small, the contact length between the waste
discharge side and the label will increase. When the waste discharge side is
pulled up, the binding force between the waste discharge side and the edge of
the label will be greater than the binding force between the label and the
backing paper. Therefore, if you encounter a label with a small area, you must
find a way to increase the angle of waste discharge to reduce the contact
length between the waste discharge edge and the label.
Reason 3: environmental
impact. The release force of hot melt adhesive self-adhesive material is
greatly affected by temperature. Its release force will be greatly reduced in
an environment with a temperature lower than 10°C. It is easy to cause the
label to be pulled up during the die-cutting waste discharge process.
Therefore, when processing hot melt adhesive self-adhesive materials in winter,
pay attention to the indoor temperature, and try to ensure that the temperature
is above 15°C.