Usually we can see all kinds of handbags in our daily life. They are all made by printing. Sometimes they are not bright. What's the reason? Jining Printing Factory summarizes several points:
1. Insufficient pressure
According to the needs of customers, the thickness of printing materials is different. The pressure between the silica gel drum and the steel drum should be adjusted according to the thickness of the printing paper. If the pressure is too low, the film is not firm, bright and easy to wrinkle. If the pressure is too high, the film wrinkle and paper deformation will occur.
2. inappropriate temperature control
When coating different impressions, the temperature of electric heating steel drum should be adjusted according to the product covered. If the covering material is gold cardboard, the temperature of the steel drum should be controlled at 70-80 C. If the covering material is 250g/m2 or 300g/m2, the temperature should be adjusted to 80-90 C. White board absorbs much more water than gold cardboard during placement.
3. Output of glue
When using stretching polypropylene film, the film should be coated with glue. The amount of glue is coated on the moving film by a transmission steel roll in a rubber box through a rotating belt. The control of glue amount is controlled by a steel blade falling on the steel roll. Jining Printing Factory reminds you that the pressure of light glue is large: the pressure of heavy glue is small. The amount of glue should be well controlled, which can not only cover uniformly, but also produce crystal points.
4. Keep the drum clean
After a long time of overlaying, the steel drum contacts directly with the membrane, plus the effect of temperature, some debris will be left on the steel drum. The silica gel drum contacts directly with the back of the overlaid product paper, and the separation of the distance between the paper traveling, many glues are directly pressed onto the rubber drum and accumulate, which will affect the brightness of the overlaid product.