Postpress Technology 1000 Questions (138-148)

138. Embossing how to operate?

Set the rules, put the printed matter between gravure and gravure, and press directly with greater pressure. When the printed matter is a cardboard, the copper (steel) intaglio plate can be heated by an electric heating device to ensure the quality of the indentation. Sumitomo Electric Co., Ltd. presses convex and concave, and it is not possible to fill in blanks and tight plates with wood strips or wooden slant blocks so as to avoid scattering accidents due to thermal deformation of the wood strips. It is advisable to use metallic materials such as aluminum bars, empty lead and iron plate locks. To adjust the pressure, the imprinting platform must be leveled and the contaminants should be cleaned. The quality of imprinting must be checked in production. As the continuous pressure gypsum mold is prone to indentation and the pressure of the concave and convex is insufficient, a layer of gypsum paste may be laid on the surface of the gypsum embossed plate, or water may be infiltrated on the gypsum surface with light pressure to achieve the required pressure.

139. What is a circular press (rolling type) embossing technique?

In the post-press processing unit of web products, round press circular convex embossing technology is adopted, that is, a pair of cylindrical molds (one female mold, one male mold) are used according to different process requirements and service life, and some are used. All are steel molds, some with a steel mold (or other metal mold), a hard plastic mold. The paper is pressed through the yin and yang molds to form a roll with a forming depth of 0. 1 4mm or so. The mold is mounted on a roller. The structure of the roller is divided into two types: integral type and assembly type. As shown in Figure 8. The assembly type facilitates the replacement of different pressure convex molds, and the integral type can ensure the accuracy of the embossing.

140. Integral rolling convex steel mold production methods which are several?

In general, there are two methods for manufacturing the integral pressure convex steel mold. The first method is to etch the etching layer on a gravure electronic engraving machine (can use a special computer software for filmless engraving) and then etch it, and the engraving depth reaches 1 to 1 .2mm. Another method is to mechanically sculpt first, and then artificially trim and finish to make a convex steel die.

141. What kind of material is used for the assembled pressure convex mould?

Assembled pressure convex mold, mass production (tens of millions), the use of steel mold, general production (tens of thousands to tens of thousands) using copper or copper mold electroplating chromium.

142. What is the manufacturing method of assembled rolled convex copper mold?

The method of producing the embossed copper mold is: designing a good pattern first, then making a film, printing a plate, etching, trimming and processing. There are two methods for corrosion of flat plates and round plates. After the flat plate is corroded, it needs to be rounded on a special jig, and then the arc-shaped copper plate is glued on the curved steel plate to form an assembled copper mold.

143. Rolling convex plastic mold is how to process?

The plastic male mold is processed by heating the cylindrical surface of the plastic mold blank with a flame spray gun and rolling it against the metal mold.

144. How to ensure the registration accuracy of web embossing?

The web post-press processing equipment, in addition to having a paper-feeding control device, controls the tension of the receiving and retrieving paper rolls and paper feeding rolls, as well as the paper feeding direction. Compression and embossing requires that the error of embossing pattern registration hot stamping or printing pattern is less than O. 2mm. The solution is to press the pre-embossed tape to the electronic image monitoring system and observe the registration situation from the display screen. Use the push button to adjust the position of the embossing position: there are also similar Mitsubishi SUNX photoelectric sensors, amplifiers, and auto-adjustment front-ends installed on the production line. Roller position mechanism.

145. According to the final processing effect, what type of embossing process?

According to the final processing effect, the embossing process generally has two types: a single laminated embossing process and a multi-layer embossing process.

1 46. What is a single laminated embossing process?

The prints processed by embossing and embossing have a uniform height on the surface and are approximately horizontal. The thickness of the paper used for printing is high, and the tensile strength is high. The graphic and text can be pressed higher: the paper is thin, the tensile strength is low, and the height of the graphic can be appropriately lowered. In addition, you should also consider whether the surface of the printed material has been coated.

147. What is a multilayer pressure relief process?

In the printed matter printed by embossing, the height of the raised surface is inconsistent, and the level is close to the state of the text body. Due to the appropriate depth and depth of processing, it is full of three-dimensional, which is conducive to satisfying the needs of visual and psychological appreciation.

148. Embossing design need to pay attention to what the problem?

1 The important performance index of the embossing process paper is higher tensile strength and breakage index, for example: whiteboard paper, paperboard, offset paper, etc. above 200g/m2.

2 The pattern of the convex-convex area distribution should be as uniform as possible to prevent the appearance of large areas of unevenness, with lines and dots uniform as well.

3 The design of embossed products should pay attention to the three-dimensional effect of the post-printing process, and play a role in clearing the points of the dragon. Convex part of the picture should not be too large.