Technological trends丨Bumping, making graphic printing concrete

Introduction: Hitting the convex, a special process technology in the surface finishing of printed matter. The use of embossing can make the printed matter have a three-dimensional effect. The overall structure also has rich layers, adding more and stronger artistry. It is an environmentally friendly process, and there is no pollution in the production process~

A special process technology in the surface finishing of printed matter, which is suitable for female (concave) and male (convex) molds, and mechanically applies pressure exceeding the elastic limit of the printed matter substrate to perform artistic processing on the printed matter surface.

characteristic

The embossing process is an environmentally friendly process, and there is no pollution in the production process. In today's green era, the use of this process can embody the environmental protection concept of users or publishers. The use of embossed embossing on the printing material can make the printed product have a three-dimensional effect, and the overall structure also has a rich layer, adding more and stronger artistry. It can replace traditional fonts, colors, etc., show the core content, emphasize a certain part of the overall design, and highlight its important position.

Material characteristics

Template material

According to different design requirements and printing quantity, the material selection of the embossing template will be different. The template material is different, and there are significant differences in production cost, process effect and printing quantity.

Zinc version (or magnesium version)

Using laser phototypesetting and film typesetting, the price of plate making is relatively low, the edges are soft, the maximum printing quantity cannot exceed 5,000, and embossed printing plates cannot be produced.

copperplate

Using laser engraving technology to make plates, the positive plates can be made of resin or plastic materials, with high hardness, high durability, clear lines, and can be used for finer graphics and lines. The printing quantity can reach 100,000 prints. The production price is more expensive.

Brass version (or zinc-copper alloy)

It is the best material for making concave-convex templates at present, and the material price and the cost of plate making are relatively high. Using laser engraving, it can be used in mass production and can reach more than 1,000,000 prints. Can produce high-quality products.

Paper

In the production of embossing, in addition to choosing the right printing, the right paper is also very important for making a good printing effect. The thickness of the paper and the rough and fine lines on the surface will affect the performance of the details. For example, the printing effect of paper with 25% cotton and 100% cotton is obviously different.

a. Generally, paper with a weight above 180g/m2 is more suitable for embossing, but this is not a constant standard. If the paper is too thin, it will be very easy to break during embossing.

b. Thick and tough paper is the basis for the printing effect, especially for the design of printed matter that needs to highlight the relief effect.

c. Long-fiber paper usually has good toughness, and its resistance to India is better than that of short-fiber paper.

d. Recycled environmentally friendly paper is not suitable for embossing. Due to the paper's own factors, it may cause deviations in the effect of different pages, and it is also prone to edge cracking.

e. If it is a process that requires heating (such as bronzing), it will greatly increase the probability of paper breakage. Therefore, it is necessary to choose paper carefully. Related tests should be done before four-color printing, and the budget for wasted paper should be appropriately increased.

Common process characteristics and applications

Suspended convex

There is no printed pattern in and around the bump area. The requirements for paper depend on the specific design graphics, but the paper with light color, long fiber and high toughness is more suitable for the plain embossing process.

Seal inscription convex

Leave a blank area when printing, and then hit the bump after printing. The production of the template requires strict alignment requirements. Since the joints will be slightly raised after hitting the bump, the template should be slightly smaller than the graphic design.

Convex texture

According to the texture and texture of the graphics, after the perfect combination with various other printing techniques, it is possible to produce printed works similar to the reproduction of exquisite oil paintings, so it is also called oil painting convex.

Engraving

The convex surface is a three-dimensional plane structure, which makes the figure emerge as a whole, but the outer contour should be changed according to the design of the picture, presenting a print-like effect, and the height of the bump can be determined according to specific needs.

Multi-convex

Using laser engraving, the level is clear, and the difference between up and down is large. There are strict requirements on the punching template production technology. In order to highlight the details, it is best to provide the template maker with fine graphics or originals.

Bronzing convex

The embossed bronzing plate is used to make the embossing and bronzing at one time. In the terminology of hot stamping anodized aluminum process, this process is called three-dimensional hot stamping. The stamping and embossing stencil is generally made of brass material, which can improve the accuracy of hot stamping and embossing. In addition, the printing material must meet the physical requirements of hot stamping and embossing at the same time. The bump height needs to consider the toughness of the paper and the impact strength of the gold foil.