Printing plastic parts, plastic products, secondary mechanic (or reprocessing) one. The so-called
secondary processing is in the plastics injection molding, once again decorative surface treatment,
such as plastic plating, plastic coating, plastic stamping, plastic printing and so on. So to secondary
plastics processing, mainly by the performance of the plastic itself, the decision, such as dyeing it
relatively simple, and the color of the light fastness is also poor. To compensate for these shortcomings,
improving the appearance of decorative plastic products, on the need for secondary processing.
IML's Chinese name: injection mold inserts its remarkable features is the process: the surface is a layer
of hardened transparent film, the middle layer is printed patterns, the back is a plastic layer, since the
ink in the middle, the product can prevent surface scratches and abrasion and can be difficult to
maintain long-term bright colors fade.
Currently, in China, transparent injection molded parts are widely used in automotive, medical, lighting,
consumer products, cosmetics packaging industry, transparent plastic injection molded parts typically
use materials PC, POM, PMMC, AS, PET.
Compared with the other colors of plastic products, strict requirements are necessary for appearance,
transparent plastic member, which makes injection molding more complicated. Factors and injection
mold design and manufacturing conditions determine the final outcome in the future, there are some
problems often occur in the transparent plastic molding process, we offer some solutions in a transparent
plastic cover for exampleinjection molding products
I. For printing on the surface of the plastic products, printing or when the pattern, there are several
methods. stencil printing of this method is the most common and also the most one method; they're
generally suitable for flat or curvature of the small print.
2, the principle curved surface printing flexography printing ink is first placed within the text or logo
engraved gravure, then copy the text or images onto a surface, the surface will re-use the text or
the pattern is transferred to the surface of the molded product, and finally through an ultraviolet light
irradiation heat treatment or the like so that the ink is cured.
Plastic in the filling process by gas interference, Often appear in the product surface silver
streaks or tiny bubbles or thick bubbles within the product. The main source of these gases is the
the moisture content of raw materials, or volatile substances or lubricants in excess, it may be the
material temperature is too high plastic heated for a long time, degradation occurs and produce
The shrinkage of wall thickness due to the inherent characteristics of plastic, after injection
molding cooling, there will be some extent of contraction. Shrinkage of the plastic shell dents
primarily on the thick-walled outer surface, which is more common for larger plastic products,
plastic materials shrink due to their volumetric properties, resulting in Raw materials appear
into the phenomenon. Therefore, the surface of the finished product will appear in signs of depression.
Shrinkage is the most common adverse effect on the finished appearance and occurs mainly at the wall
thickness. The practice has proved that if the injection pressure drops, the chances of shrinkage will increase.