Technical requirements for label material in sheet-fed in-mold

If someone asks the technical requirements for the raw materials of the label in a single sheet of paper, what are the specific requirements? For the label Jun, although I know a little, it is really difficult to elaborate. Fortunately, there is a team of experts behind the label, and there are many resources. Mr. Fu Qiang summed up a few tips before , and will bring you convenience in the work. Therefore, the label is sorted out here and shared with everyone!

Eliminate static electricity

The surface of the film material usually has different degrees of static electricity, and the static electricity has a decisive influence on the transportation and positioning of the single material. If there are double sheets (multiple sheets) when the material is fed, the machine will stop; if the material is skewed during paper feeding, causing downtime or inaccurate printing positioning, waste will occur when die cutting. Therefore, controlling the degree of static electricity actually controls the accuracy of paper feeding, reduces waste, and improves the authenticity rate.

A single sheet of material is generally supplied by the material supplier (there are also processors who purchase large rolls and cut them themselves), so suppliers must install high-efficiency static eliminators on their own cutting machines, usually with electrostatic values ​​below 1 kV. Can be shipped from the factory.

Before the printing factory is required to print, the material should be placed in a constant temperature and constant humidity workshop in advance. The ideal condition is temperature 22 °C ± 2 °C and relative humidity greater than 60%. The printing plant should be equipped with an electrostatic test instrument to pre-check the static electricity level on the surface of the material. If the electrostatic value is seriously exceeding the standard (tens of kilovolts, or even hundreds of kilovolts), the usual practice is to open the package, increase the humidity of the environment, and let the free electrons on the surface of the material be lost. If there are conditions, you can use the empty paper method to speed up the elimination of static electricity.

In short, do not understand the static degree of the material before printing, can not easily print on the machine, understand the static situation should try to eliminate, and inform the supplier to provide qualified materials in the future.

flat surface

The film material is required to have a smooth surface and a clean edge after cutting. The flat surface reduces double-folding, and the clean edges reduce white spots and paste during printing. If the material is not flat after the cutting (core portion), it can be improved by pressing the bent material for a while. To ensure that the edges of the material are clean and tidy, the cutter must be sharp and replaced regularly to ensure accuracy.

Keep the surface of the material clean

Eliminating static electricity and ensuring that the edges of the material are cleaned are one of the conditions for keeping the surface of the material clean. Another requirement is to keep the workshop clean and free of dust and to maintain the desired temperature and humidity conditions. The surface of the material is cleaned to print a qualified product.

Are the above three points easy to remember and easy to use? In fact, technical requirements must be kept in mind by every operator, and small tips can solve big problems.

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