What’s more, plastics with glossy surfaces are generally difficult to laser engrave. Blue hue, for example, causes blue laser light to be reflected from the surface of the plastic, but the overall effect depends on the tint or shade of a particular color. Production steps such as heat treatment, mechanical processing and coloration affect optical properties of a particular plastic as well. random polymerisation yields plastics with higher clarity) or its modifications by usage of additives (clarifiers and nucleators) that act upon the size and growth of the crystal structure. Overall, the clarity of the plastic produced can vary for a particular polymer, depending on the production method (e.g. Translucent acrylic sheets are popular for sign making as they are excellent for backlighting. Semi-crystalline or crystalline polymers can be translucent or opaque as a consequence of differences in refractive indices between the amorphous and crystalline regions (e.g. Crystallinity for plastics can stretch from 0% (totally amorphous) to 100% (totally crystalline), but a crystalline polymer is never 100% crystalline and forms adjacent amorphous and crystalline regions instead. In general for plastics, as the percentage crystallinity increases, the manufactured plastic sheet becomes gradually less clear. Examples of translucent objects include tinted car glass, frosted glass and many plastics. As a result, you cannot see clearly through such an object and an item placed on the opposite side of a translucent sheet appears fuzzy and unclear. Photons that pass through a translucent object are repeatedly scattered and change their direction several times. Translucent materials, on the other hand, allow only a portion of light to pass through them. There is consequently no refraction because of this alignment. Films of certain crystalline polymers, such as PET and PP, are also transparent as a result of being stretched in two directions (and thus bi-axially oriented), which aligns the polymer molecules in the film’s plane. Examples of transparent materials include plate glass and amorphous plastics (e.g. A transparent material is a material that appears clear and of a single color. Transparency is a physical property of materials, which means that light can travel through an object without scattering (on a macroscopic scale). Each object interacts with photons by a combination of transmission, reflection and absorption. The interaction depends on the intrinsic properties of the material as well as the wavelength of the laser. When laser light arrives at an object, it can interact with this object in several different ways.
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