Do you know how to detect silk screen products?

As brand owners have shorter and shorter delivery time requirements for packaging materials, suppliers’ spot demand highlights the importance of post-processing cosmetic packaging materials, such as plastic bottles, glass bottles, lipstick tubes, air cushion boxes, etc. Graphic screen printing of materials . Do you know the product quality description and conventional testing methods for screen printing of packaging materials? Let's discuss it.

1. The testing environment for silk-screened parts .

Luminosity: 200-300LX (equivalent to 40W fluorescent lamp, the distance is 750MM)

2. The inspection surface of the product and the visual direction of the inspector are about 45° (as shown in the figure below), and the time is about 10 seconds.

The distance between the inspector’s visual direction and the surface of the product to be inspected is as follows:

Class a surface (outer surface that can be directly viewed): 400 mm

Class b surface (not visible on the outside): 500 mm

Class c surface (difficult to observe the inner and outer surfaces): 800 mm

2. Common defects in silk-screened parts.

1. Foreign matter: After screen printing, the coating adheres to dust, dot or filament foreign matter.

2. Exposure of the bottom: because the screen printing position is too thin, the exposure bottom color is too thin.

3. Missing printing: It is required that the silk-screen printing position is not in place.

4. Blurred/broken lines; poor silk screen printing lines and patterns are uneven in thickness, blurred, and the word lines are partially disconnected.

5. Uneven thickness of screen printing: Due to improper screen printing operation, the thickness of the screen printing layer of dotted lines or patterns is uneven.

6. Misalignment: Due to the inaccuracy of the screen printing position, the screen printing position is offset.

7. Poor adhesion: the adhesion of the screen printing coating is not enough, you can use 3M adhesive tape to paste.

8. Pinholes: pinhole-like holes can be seen on the surface of the coating film.

9. Scratches/scratches: Improper protection after screen printing.

10. Variety/stain: non-silk-printed colors are attached to the surface of the silk-printed.

11. Chromatic aberration: Compared with the standard color palette, the chromatic aberration is larger.

3. Test method of screen printing reliability.

N-hexane wipe test

Conditions: above PCS, white cotton gauze, n-hexane, 1.5+0.5/-0KGF products.

Test procedure: tie the bottom of the 1.5KGF tool with white cotton gauze, dipped in n-hexane solution, and go back and forth 30 times (about 15SEC)

Test judgment: the product printing pattern must not have peeling off/notch/broken line/bad ink adhesion, etc., and the color can be allowed to be light, but the printing pattern should be clear and not blurred, otherwise it will be unqualified.

Gasoline wipe test.

The sample is above 5PCS, white cotton gauze, gasoline mixture (gasoline: 75% alcohol=1:1), 1.5+0.5/-0KGF products.

Test procedure: tie the bottom of the 1.5KGF tool with white cotton gauze, dipped in the gasoline mixture, and go back and forth on the printed pattern 30 times (about 15SEC)

Test judgment: the product printing pattern must not have peeling off/notch/broken line/bad ink adhesion, etc., and the color can be allowed to be light, but the printing pattern should be clear and not blurred, otherwise it will be unqualified.

Thumb test.

Condition: The experimental sample is more than 5PCS.

Test procedure: Take a sample, place your thumb on the printed picture, and wipe it back and forth 15 times with a force of 3+0.5/-0KGF.

Experimental judgment: product printing pattern is indispensable/broken/ink adhesion is poor, otherwise it will be unqualified.