In the modern commodity economy, packaging bag printing is an important means to enhance product image and convey product information. It covers a number of key aspects and has a profound impact on the market competitiveness of products.

1. Printing process

Intaglio printing: Intaglio printing transfers ink by engraving the graphic area on the plate cylinder. It is characterized by thick printing ink layer, bright color, high saturation, stable printing quality, suitable for large-scale production. In packaging and printing, it is often used for products with high color reproduction and printing accuracy, such as high-end food and cosmetic bags.

Flexographic printing: Flexographic printing using flexographic material, through the mesh roller transfer ink printing. The process has the advantages of low cost, good environmental protection, fast printing speed and strong adaptability to substrate materials. In the field of packaging, it is widely used in all kinds of flexible packaging, corrugated carton printing, especially suitable for water-based ink printing, in line with the trend of environmental protection.

Offset printing: Offset printing is based on the principle of oil and water insolubility, and the ink is transferred to the substrate through the rubber cloth. Its printing images are delicate and rich in layers, suitable for printing high-precision patterns and text. Often used in paper packaging bag printing, can show exquisite design effects, such as gift bags, high-end product packaging boxes.

2.Ink selection

Solvent-based inks: solvent-based inks have the advantages of fast drying speed, good printing adaptability, etc., and can obtain good adhesion effect on a variety of packaging materials. However, it contains volatile organic compounds (VOCs), which has a certain pollution to the environment. It is still used in some packaging and printing with relatively low environmental protection requirements.

Water-based ink: Water-based ink with water as a solvent, with environmental protection, safety and other characteristics, almost no harmful volatiles, in line with the development trend of green printing. With the progress of technology, its printing performance continues to improve, and it is more and more widely used in packaging bag printing with high requirements for health and safety, such as food and medicine.

UV ink: UV ink is cured instantly by ultraviolet irradiation, with fast curing speed, high hardness of ink layer, good wear resistance and so on. Suitable for packaging wear resistance and gloss requirements of high products, such as plastic bags, metal foil bags and other printing.

3. Design points

Highlight the brand image: The packaging bag printing design should place the brand identity, brand color and other core elements in a prominent position to ensure that consumers can quickly identify the brand and strengthen the brand impression. Coca-Cola's red packaging and iconic font, for example, remain consistent throughout the print design and are highly recognizable.

Clearly convey information: Product name, specifications, ingredients, use methods, shelf life and other key information needs to be clearly and accurately printed on the packaging bag. Reasonable planning of information layout, the use of appropriate fonts and sizes, easy for consumers to read and understand.

Fit product positioning: The printing design style should match the product positioning. Packaging bag printing of high-end products often adopts simple and exquisite design, and uses high-quality printing technology and materials; Packaging bags for children's products may be designed with bright colors and rich cartoon images.

4. Quality control

Color management: Establish a sound color management system to ensure that the printed color is consistent with the design draft. Through standard color cards, color measuring instruments and other tools, accurate control of ink allocation and color in the printing process to avoid color deviation.

Graphic clarity: In the printing process, strictly control the printing pressure, ink transfer and other parameters to ensure that the text is clear, the pattern edge is sharp, to avoid blur, double image and other problems.

Printing fastness: Test the ink adhesion and wear resistance of the printed packaging bag to ensure that the ink is not easy to fall off and fade during the packaging use, and ensure the integrity of product information and the beauty of the packaging.

Packaging bag printing is a comprehensive system engineering, involving printing process, ink selection, design and quality control and other aspects, the synergy of all links in order to produce high-quality, in line with market demand for packaging bags.