Postpress Technology 1000 Questions (160-166)

16o. What are the different characteristics of the combination of the concave and the convex graphic and the printed graphic?

The combination of the concave-convex text and the print graphic has its different surface features. It directly combines the levels and shapes of the concave and convex parts, increasing the three-dimensional and realistic effects of printed graphics and indirect visual image incorporation, and printing the concave and convex parts together. Graphic and text complement each other, correspondingly shine, giving people a sense of novelty mixed, bumpy printing and graphics with the main and auxiliary dependent, clever background, increase the sense of change in the product, enrich the performance of the product; prime convex make the product luxurious Generous, it is very elegant.

161 What are the causes of the appearance of the outline of the graphic lines in the embossing? How to rule out?

1 Due to the fact that the pad version is not true at the time of loading, the scraps of the scrap paper are not thin, the pressure is not enough, etc., and the pressure should be appropriately increased to make a fine pad.

2 Due to the uneven distribution of gypsum layer or the gypsum layer side paving, the speed is too fast and the impact force is excessive, resulting in insufficient gypsum thickness and should be corrected.

(3) Due to the poor precision of the embossing press, the concave printing plate and the convex gypsum layer during the imprinting process cannot be brought into close contact with each other, resulting in displacement and should be corrected.

(4) Due to too many prints, the compression of the convex gypsum layer should be repaired.

(5) Due to the difference in paper thickness or double sheet embossing, the paper selection should pay attention to uniform thickness and avoid double-sheet input.

162. What is the reason for the failure of the embossed outline position and how to eliminate it?

(1) The engraving position of the printing plate is inconsistent. If the position of the printing plate is smaller than the desired embossed printing face, the printing plate may be re-engraved and corrected.

(2) The position of the printing plate has a large embossed printing surface, and a large error must be re-gravure. A small error can be corrected in the flat gypsum layer.

(3) The position of the stop does not match. Adjust the gauge to the correct position.

(4) The displacement of the printing plate frame makes the position of the concave printing plate and the flat convex gypsum layer different, and the printing plate frame is adjusted and fixed.

(5) There are many places where the same printing plate graphic is distributed, and it cannot be completely set. It can be divided into two embossings. The plaster layer is divided into two parts in different parts.

163. What are the causes of surface spot defects on the embossing and how to eliminate it?

1 The gypsum powder or glue is not clean, and impurities are not removed. It should be checked and cleared in advance.
2 The poor quality of paper contains impurities, and the convex gypsum layer pavement is damaged during embossing and should be repaired and added.
3 The plate is covered with plaster or other impurities and should be cleaned.

184. What is the cause of the incomplete failure of the flat convex gypsum layer in the embossed printing and how to eliminate it?

(1) When the gypsum plaster layer is mixed into a gypsum slurry, too little glue is added, or the quality of the gypsum powder is poor, and the adhesive fastness is insufficient.
(2) During the imprinting process, the plate and plates are displaced and crush the flat convex gypsum layer and should be prevented.
(3) Abrupt increase in pressure or double imprinting during imprinting should be prevented.

1 65. What is a drop molding process?

Dispensing is a process that uses the form of plastic droplets to obtain a crystal-like raised effect on the printed surface. Its crystal, three-dimensional decorative effect is excellent. Dispensing surface also has water, moisture resistance, weather resistance, UV light protection. (As shown below)


166. What is the main application of the plastic drop process?

Dispense technology has been widely used in home appliances, luxury cars, luxury motorcycles, trademark nameplates, daily hardware products, tourism commemorative badges, exquisite craft jewelry, high-end book cover and other fields of decoration.

Source: "Guangdong Printing" (author / Jin Yinhe: Beizhuang Institute of Graphic Communication)

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