Introduction of Silk Screen Printing Process for Cosmetic Packaging Materials

Introduction of Silk Screen Printing Process for Cosmetic Packaging Materials
The screen printing process has been widely used in all walks of life today, and almost most industries need silk screen printing when it comes to packaging. Among them, the cosmetics industry is also used more, because most cosmetic packaging materials need to be applied to silk screen printing, whether it is an outer packaging carton or an inner packaging bottle, the silk screen printing process is indispensable. So whether you have a detailed understanding of the silk screen process, let's popularize this knowledge for everyone.

What is silkscreen?
Screen printing belongs to stencil printing, which is called the four major printing methods together with lithographic printing, letterpress printing, and gravure printing. Stencil printing includes transcription, perforated pattern, spray pattern and screen printing. The principle of stencil printing is: during printing, the printing plate (paper film plate or other plate base with holes through which the ink can pass through) transfers the ink through the holes of the stencil to the substrate (paper, ceramics, etc.) through a certain pressure. ) to form images or text.

During printing, through the extrusion of the squeegee, the ink is transferred to the substrate through the mesh of the graphic part to form the same graphic as the original. Screen printing equipment is simple, easy to operate, easy to print and plate making, low cost, and strong adaptability. Screen printing is widely used in common prints: color oil paintings, posters, business cards, binding covers, commodity signs, and printed and dyed textiles.

Screen printing principle
Screen printing consists of five elements, namely screen printing plate, squeegee, ink, printing table and substrate. The basic principle of screen printing is to use the basic principle that the mesh of the graphic part of the screen printing plate is transparent to the ink, and the mesh of the non-graphic part is impermeable to the ink. When printing, pour ink on one end of the screen printing plate, apply a certain pressure to the ink part of the screen printing plate with a scraper, and move to the other end of the screen printing plate at the same time. The ink is squeezed onto the substrate by the scraper from the mesh of the graphic part during the movement. Due to the viscosity of the ink, the imprint is fixed within a certain range. During the printing process, the squeegee is always in line contact with the screen printing plate and the substrate, and the contact line moves with the movement of the squeegee. A certain gap is maintained between them, so that the screen printing plate during printing generates a reaction force to the squeegee through its own tension. This reaction force is called rebound force. Due to the effect of resilience, the screen printing plate and the substrate are only in moving line contact, while other parts of the screen printing plate and the substrate are separated. The ink and the screen are broken, which ensures the printing dimensional accuracy and avoids smudging the substrate. When the squeegee scrapes the entire layout and lifts, the screen printing plate is also lifted, and the ink is gently scraped back to the original position. So far it is a printing trip.

Precautions for silk screen printing of cosmetic processing packaging materials

1. Silk screen printing is generally used as a graphic and text label processing process for packaging products, which has an important impact on the product image, so it has higher technical requirements.

2. Silk screen printing on glass bottles: For screen printing on blank transparent or frosted or sprayed bottles, high temperature ink should be used. After coloring, it will be baked at high temperature. It will not fade and not easy to scratch. The first manufacturer to carry out silk screen printing is generally more than 5,000 pieces, the fee for less than 5,000 pieces is 500 yuan/style/color, and the amount for more than 5,000 pieces is calculated at 0.1 yuan/color time.

3. In the design, no more than 2 colors should be considered. The film should be negative. The text, pattern and lines should not be too thin or too large, which may easily cause broken lines or ink accumulation. Proofing should be confirmed before mass production to avoid Color differences appear.

4. If the frosted glass bottle is wrongly printed, it can be re-polished and printed again, and the processing fee is 0.1 yuan - 0.2 yuan per piece.

5. The same color printing of the round bottle is counted as one color, and the flat or oval shape is calculated according to the number of printed surfaces and the number of printed colors on the printed surface.

6. Plastic containers are divided into ordinary ink and UV ink screen printing. UV ink is widely used. The words and pictures have a three-dimensional effect, are more glossy, not easy to fade, and can be printed with multi-color effects. The starting quantity is generally more than 1000.

7. The screen printing fee for glass bottles and plastic bottles will be charged. If it is a new specification packaging bottle and the screen printing factory does not have the corresponding fixture, the fixture fee will be charged, but this fee can be deducted by doing a certain amount of silk screen printing. For example, the business volume is over 2 More than 10,000 yuan can be exempted from this fee. Each manufacturer has different conditions. Generally, the screen printing fee is 50-100 yuan/piece, and the fixture fee is 50 yuan/piece. The hot stamping fee is 200 yuan/piece.

8. Proof before batch screen printing, and then produce after confirming the effect of graphic screen printing. After confirmation, the production adjustment period is 4-5 days, depending on the difficulty and quantity of screen printing.

9. Usually the silk screen printing factory has bronzing, hot silver and other processing techniques, and the silk screen printing methods include manual, mechanical screen printing, pad printing and sticker pad printing and other technologies.

10. When producing and using silk-screened bottles, care should be taken to avoid excessive handling or collision, avoid the effect of grinding silk-screen printing, and pay attention to choosing a reasonable disinfection method during production.

11. The minimum cost of silk screen printing is 0.06 yuan/color, but special attention should be paid to the fact that the screen printing is not good enough to achieve the expected design effect, and the whole batch of containers may be scrapped. Screen printing can be screen-printed according to the percentage of spot color to achieve rich colors.