Quality Characteristics and Testing of Blister Packaging Aluminum Foil Printing Materials (2)

Second, the main quality problems and analysis of medicinal aluminum foil printing

1. Pharmaceutical aluminum foil printing appearance quality requirements

(1) The printed surface of aluminum foil is correct in hue, bright in color, bright in color, bright in ink and smooth in edges.

(2) Printing fastness: The adhesive ink is not decolorized with transparent tape.

(3) The pattern text and lines are clear, complete and indestructible.

(4) Rich layers of printing textures and clear outlets.

(5) The appearance of the printing is clean and tidy, no obvious dirty knife wire.

(6) The same color density deviation and the same batch color difference index meet the requirements after the final managerial inspection.

2. Foil printed text or figure incomplete

Cause Analysis:

(1) The ink dries too quickly, resulting in a dry print.

(2) Excessive wind and heat affect the concave surface of the printing roller.

(3) plate etching line, ink adhesion.

(4) The squeegee is too far away from the print point on the printing roller.

(5) The speed is too slow.

3. Aluminum foil printed surface colored lines (lines)

Cause Analysis:

(1) The squeegee blade has hard particles close to the roller and debris must be removed. If you encounter a fixed line must be sharpened or tool change can be.

(2) If the lines are fixed, the hard spots in the rollers are embedded in the rollers and must be removed by parking.

(3) When the new roll was started to use, it was found that the fixed line mark was generally caused by the chrome plating of the printing roller and the rough surface was not sanded or repaired, resulting in pinholes.

(4) The resin and pigment in the ink are not ground, it will also cause line marks, which must be removed by wire mesh filter.

(5) Squeegee angle and position, hardness must be adjusted properly.

Author: Bai Bing Source: China Printing