Mainly used in the advertisement lamp box. The lamphouse piece is divided into two kinds, one kind is transparent, called full penetration piece, one kind is translucent, called semi transparent sheet, also called the Taibai tablets. All through the lamphouse piece, only in the light irradiation, will appear bright color, without light irradiation, will appear dark. Semi transparent light box piece, otherwise, no lights will show color photo effect, while the light irradiation, will become even more beautiful.
The lamphouse piece introduction
A light box tablet is a special kind of positive photosensitive material, similar to enlarging paper, in the production process also process and enlarge the photo of the same.
For the best use of the 120 camera shooting lamp box, because the advertising light box piece usually need to made a huge photo. The use of ordinary negative film. Shooting method and ordinary negative same shooting method.
2 methods of making the lamphouse piece
The torn off the backing film. The film color photos on the back of the uniform torn off. The polished fiber. The paper based on photographs of the back of the hair fiber polishing. The increase of papermaking base. The resin, varnishes, oil or wax antireflection material evenly coated in the paper based on a photograph, a few hours after the increase of transparency in the photo. The growth rate of protection. Will have been increasing back through photos of antireflection material slightly dry, top with protective layer. Such as plastic film, transparent varnish etc..
There is a back spraying lamp box film, color bright, suggest doing this light box piece, not easy to distortion.
3 light box film classification and Application
At present, the lamphouse piece on the market are mainly back spraying lamp box film and is sprayed the lamphouse piece two.
Back spraying lamp box film
Back spray light box piece is composed of substrate and the coating is formed by the combination of. The coating on the back, composed of special coating and its white shading layer. White shading layer to make the light form the diffuse reflection, the other side after printing ink through the shading layer penetration into the coating, positive image. Image printing on the back, the lamphouse piece positive does not hurt, do not affect the image of the ornamental effect. However, generally applies only to the back lighting lamp box, the scope of application has the very big limitation.
(1) gelatin system:
Advantages: bright color, because the gelatin itself is a kind of color developing agent, the coating can be used as a photographic film.
Disadvantages: because it is naturally formed, it is difficult to carry out the chemical modification, poor weather resistance, easy to dry slow, crimping phenomenon.
(2) PVA (polyvinyl alcohol) system:
Advantages: low cost, good weatherability, synthetic, easily according to the need for chemical modification.
Disadvantages: color reduction is slightly worse.
(3) composite formula system:
At present the main formulation of coating system with gelatin and PVA composites (adding cellulose materials).
Advantages: the comprehensive advantages of the above two kinds. Such as: nano materials.
