If you want a transparent plastic folder with only a logo, we advise you to add a slight tint in your plastic to improve the rendering. You can take as an example a water bottle which, even if it looks transparent, has a slight tint. You can, for example, take a tint of your logo and add a small percentage of it in the transparent area.
When you download a template from an Illustrator or Photoshop plastic folder you have several layers: a layer for the CMYK and a layer for the white support (see info below). If you use in your design a Pantone color, hot gilding..., you have to create a third layer mentioning the color used.
Polypropylene and CMYK
The white of support
When you print a very dark flat print on a large surface (e.g. a black background on the back of a cover) with a white backing and a glossy finish, micro scratches can be seen under the grazing light. A dark, opaque surface with a glossy finish will reflect light. When it passes over the micro-stripe, it will be diverted and thus make the micro-stripe visible from certain angles.
You can find in the shops big brands that print black or dark flat areas on plastic sleeves and you will be able to see the same micro-scratches under the light. For the brands that need a very demanding rendering and do not want to see these micro scratches when handling their folder under a particular lighting, you can choose one or more of these solutions:
- Choose a matte finish that absorbs more light.
- If you are free to modify the design to avoid problems :
- Avoid large, very dark and opaque areas with supporting white.
- replace your solid by a rasterized rendering or with effects to your design