Classification of Refraction Technology in Printing Plants [Buke Printing]

Classification of Refraction Technology in Printing Plants [Buke Printing]

The principle of vegetable pressing (printing), using refractive plates and die-cutting and creasing machines (or printing machines) as production tools, and using mechanical pressing processing methods to produce refractive effects in printed materials, is generally referred to as mechanical refractive technology. According to the development of refractive technology and different specific processes, mechanical refractive technology can be divided into two types: traditional refractive technology and new refractive technology

1. Traditional refraction technology

The traditional refraction technique is one of the earliest used refraction techniques, where the indentation line block is divided into straight lines to represent the block surface, and different block surfaces are represented by different angle transformations. Different geometric shapes (such as triangles, squares, concentric circles, etc.) are formed by arranging straight lines or curves in different directions according to certain rules. When light is irradiated, the direction of refraction appears different, which will create a dazzling light ocean effect on the surface of printed materials. Therefore, lines have become one of the basic elements that affect the refractive effect. When designing the lines of the indentation layout, it is necessary to strictly control the spacing design of the lines, which is generally around 0.15mm. As mentioned earlier, 'fold'

The general process of optical technology "refers to the process of traditional refractive technology.

(a) Linear indentation version

Using different lines to decorate different images and objects can create a subtle art in refractive prints

(b) Curve indentation version

To enhance the mystery of printed works, the main lines of the screen are generally represented by 45 or 135 ° lines, while large areas can be represented by 90 ° or 0 ° lines. For color images, it is necessary to consider matching the angles of the refracted lines and color printing lines to avoid the "turtle pattern" phenomenon that occurs in conventional color printing, which affects the performance of the refracted product. In addition, the angle selection of the refracted lines should not be too many, generally 4-6 angles are recommended, otherwise it will bring unnecessary trouble to the plate making process

2. New Refractive Technology

Although traditional refractive technology can produce effective refractive technology products, it requires expensive production costs and the refractive effect is limited by the surface brightness of the substrate. Therefore, the limitations of traditional refractive technology are becoming increasingly apparent, especially in the application of high-end printed surface decoration, anti-counterfeiting printing, and packaging products, which cannot meet practical needs. With the application of computer technology in the printing field and the continuous development of plate making technology, new types of refraction technology have emerged. Currently, the refraction effect of many refraction technology products is no longer simply a straight line, but changes into a refraction curve effect according to the curve changes of the picture pattern, making the images of birds and animals on the picture realistic and the landscape jumping on the paper. The overall refraction effect is also unpredictable. The refraction production technology of this effect has entered the high-tech field, and its technical content is incomparable to traditional refraction technology. This refraction technology, which integrates computer technology, plate making technology, printing technology, and molding technology, is commonly referred to as new refraction technology.

The new refractive technology is a comprehensive application of computer technology, plate making technology, and molding technology.

(1) By utilizing modern technology such as computers, the relevant issues involved in refraction technology (such as differences in light position, light type, and brightness of reflected light) are processed into data. At the same time, storage formats for graphic images, layout description languages, light incidence and refraction conversion processes are designed to provide reliable data and technical support for the production of printing plates.

(2) Refractive plates are usually composed of multiple pattern blocks to form a layout. The application of computer plate making technology can achieve automatic typesetting under program control, completely replacing traditional typesetting processes such as overlay splicing, small format first splicing, and positioning splicing; At the same time, computer numerical control laser engraving technology can be used for the engraving and plate making of refractive plates. This plate making method can process any shape according to the design needs, and can quickly depict various patterns, numbers, and text. The cutting edge is extremely fine, the heat affected area is small, the cutting surface is smooth, without burrs or cutting residues, and does not require polishing treatment. High quality edges can ensure the expression of fine line textures.

(3) Refractive molding is different from ordinary printing and molding techniques, and has specific technical requirements for molding pressure and roller lining materials (refractive molding plates have a flat surface, large area, high line density, and complexity). Generally, circular flat molding machines with higher working pressure (single area pressure is more than twice that of general molding machines) are selected to achieve good line transfer, good refractive effect, and attractive luster in the molded products; The texture and hardness of the roller packaging material should be appropriate (too hard will damage the metal film surface layer on the substrate and lose the metallic luster; too soft will cause the compression deformation of the lining material to exceed the allowable range and affect the line embossing, making the indentation of the line blurry and unclear). Generally, felt made of a mixture of wool, rubber, and pulp is used as a pad, and the product embossing effect after cold pressing is excellent.

(4) The refractive processing paper used in the new refractive technology is generally made of aluminum plated paper, with various surface colors such as gold and silver, as well as matte paper. The thickness range of the paper is wide, with multiple types of paper available between 80-250gm2. As a high-tech printing surface finishing technology, refractive technology is widely used in high-end printing decoration and filling

Classification of Refraction Technology in Printing Plants [Buke Printing]