Ink scraper

The ink scraper controls the complex process of ink transfer in offset printing, including ink, plates and paper. In gravure printing, the ink scraper is a mechanical operation that is relatively simple, but it has its own uniqueness.

table of Contents

1 ink scraper summary

2 ink scraper classification

▪ Standard scraper

▪ Bevel scraper

▪ Coating scraper

▪ sharp scraper

▪ Trapezoidal scraper

3 ink scraper specifications

4 Scraper performance indicators

5 ink scraper application

▪ printed varieties

▪ Printed substrate

▪ Ink characteristics

6 ink scraper material

Ink scraper

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The ink scraper controls the complex process of ink transfer in offset printing, including ink, plates and paper. In gravure printing, the ink scraper is a mechanical operation that is relatively simple, but it has its own uniqueness. Ink scraper requirements must be abrasive and efficient in order to ensure the high quality of printing quality, and it must be suitable for modern gravure printing lasting and high-speed needs. The ink scraper is a sheet of metal on the printing press that is used to scrape off the excess ink on the surface of the drum. Ink Scraper In each printing process, removing the ink without the pattern area is a key.

Ink scraper classification

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Standard scraper

The standard scraper has exactly the same blade thickness. In the life of the scraper, the contact area with the drum to keep the same, so the color is exactly the same. The blade part of the unique polishing process can be printed at the beginning of the scraper quickly with the roller fit, reducing the waste.

Bevel scraper

The larger angle design of the blade shape makes the scraper wear less, the reduction in contact area can provide a clear scraping effect. Larger bevel design also reduces blade breakage. The degree of bevel varies from 4 ° to 15 ° and is applied to the printing of the short version.

Coated scraper

Scraper with carbon-based substrate, the surface coated with nickel. The coating provides excellent corrosion resistance and oxidation resistance. It is very suitable for printing with corrosive inks and varnishes. In the course of use, the coating can also make up for impurities in the ink on the scraper fine damage, thereby reducing the color changes and stripes appear. The coating scraper is ideal for coating applications.

Sharp scraper

The new scraper can be applied to the gravure machine when the blade angle is difficult to adjust. The sharp blade provides elastic tension while maintaining a high contact angle. This unique design ensures smooth blade pressure to maintain the correct contact angle. Reducing printing pressure means extending drum life and reducing streaks.

Trapezoidal scraper

With the progress of science and technology, the use of scraper printing marked: trapezoidal scraper because of its own from beginning to end and the contact area with the roller constant as the same, consistent with the printing quality, more and more manufacturers are used by the printing. Now most of the scraper used on the market is this trapezoidal scraper.

Ink scraper specifications

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Generally expressed as:

A × B / c × d

A. The width of the blade body (10,22,30,40,50,60mm)

B. Thickness of the body (0.15,0.20mm)

C. Blade width (1.3mm, 1.4mm)

D. Thickness of blade (0.065,0.075,0.10mm)

Scraper performance indicators

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1. Thickness Tolerance: +/- 0.005mm

2. Width tolerance: +/- 0.100mm

3. Polished surface deburring

4. Tensile strength: 1950 ~ 2150Pa (1860N / mm2)

5. Straightness: 0.5mm / 3.0m

6. Hardness: 500 ~ 600Vickers

Ink scraper application

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Before using the scraper, please know the following:

Printed varieties

Gravure, flexo printing plate, generally according to the following printing category to select the required scraper, but the required blade error is not greater than +5um. 50 um: mainly used for ordinary packaging printing: cardboard and decorative printing.

Printing substrate

Paper, plastic film, aluminum foil, etc., need 75um ink scraper, mainly for gravure printing film foil scraping ink.

Ink characteristics

Soluble, water-based, coating materials, the choice of 100 um: mainly used for flexible printing, coating and roller, etc., and 125 um: mainly for flexible printing: ceramic anilox and so on.

Ink scraper material

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According to the quality of scraper substrate, can be divided into the following scraper:

1. Carbon steel scraper

2. Plastic scraper

Ink scraper

3. Coated scraper

4. Stainless steel scraper

Ink scraper material requirements with high quality, clean, no impurities, wear.