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The three key factors of pre coated thermal laminating film in the application

time:2016-08-15    点击:1967

Today, the use of pre coated film has become very common, but how can we use it? what we need to pay attention to?

The use of film and the film mainly need to pay attention to three aspects of the control, respectively:

Firstly ,Film speed:

Fast film, BOPP film adhesive in roller heating the heating time is short, the short contact time of film and paper, adhesive effect.

Production rate of domestic pre coated film equipment is generally controlled between 5 - 30m / min.

Above of predeposited lamination of three key technologily -- film temperature, film pressure and film speed do simple analysis, but between the three regulation complexes should be according to equipment , resin coated products are different as well as the use of the actual situation of different kinds of films, the flexibility, the only way to get high quality resin coated products.

Second, film pressure:

The surface of the paper is not smooth, only under the appropriate pressure and molten hot melt adhesive to completely cover the printed surfaces, coated products bright and bonding effect is good. Pressure is small, the bond is not strong; the pressure is big, it is helpful to improve the bonding strength between the film and paper products.

However, if the pressure is too large, and easily produces wrinkles, and easy to make rubber roller surface injury. Deformation, reduce the service life of rubber roller.

With the increase of pressure, the contact pressure between the rubber roller and the heating roller increases, aggravate the two roller shaft, bearing load, the wear is intensified, at the same time, the transmission system overload, and too much pressure will affect the whole service life.

In actual production, the pressure should be adjusted according to the difference of the paper. For example, the paper loose paper, the pressure should be larger, and vice versa. According to experience, plastic film pressure is generally set to 8 ~ 25MPa is appropriate.

Thirdly, covered with plastic film temperature:

Temperature is predeposited lamination primary factor also, because the predeposited adhesive is hot melt adhesive, the temperature determines the melting state of hot melt adhesive, hot melt adhesive molecules to the BOPP film, printing products ink layer, paper permeability and diffusion capacity.

Despite the film temperature helps to improve the bonding strength enhanced, but the temperature is too high will cause the film to produce contraction, shiny surface foaming products produce wrinkles. According to the practical experience, the film temperature should be controlled between 100 to 70 degrees celsius.


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