In-mold labeling process
In-mold labeling process is a new packaging technology, it will be pre-printed images on polymer materials, and then the printed image labels directly into the mold in the predefined molding area, in the process of product injection molding so that the label and the container fused together, the label and the product surface is flush with the appearance of the pattern as directly printed on the surface of the product in general. Compared with laser etching technology, in-mold labeling technology has the following advantages:
- High clarity, because there is no fuzzy edges produced by laser ablation, printing accuracy can easily reach more than 1200 dpi, which is more than 4 times the best level of laser etching technology.
- The contrast is obvious, and a near-ideal black and white contrast can be achieved during printing, with a contrast much higher than the gray-black or gray-white contrast produced by laser etching. The high definition and strong contrast ensure the reliability of bottom code reading.
- Colors can be achieved. While relying on laser etching can only achieve monochromatic contrast, the in-mold labeling process based on printing technology can introduce color. Different color combinations increase the information channels and allow more information to be encoded on a limited area without shrinking the encoded graphic points (color code or 3D code).
- Reducing the wall thickness of the product while ensuring the structural strength of the product, because the thickness of the label is extremely thin, the frozen storage tubes produced based on the in-mold labeling process can be regarded as a whole with a uniform wall thickness. It does not have the problem of doping additives to affect the biological activity or background of the sample in response to laser ablation, nor does it bring about the problems of wall thickness overrun and separation of the two-layer structure produced by two-color injection molding. The former affects the container’s responsiveness to temperature changes (e.g. programmed cooling or warming) while the latter affects the structural strength of the product under drastic temperature changes.
- Good firmness, in-mold labeling of the label surface will be covered with a protective layer made of polymer materials. This protective layer is sufficient to meet the needs of normal use of wear-resistant, in organic solvents, high-temperature steam sterilization, liquid nitrogen cryogenic freezing and ultrasonic cleaning and other extreme conditions can show good resistance.
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