Whether it is an exquisite packaging box or a simple label, the production of a printed product typically involves three major stages:
1. Pre-press: This is the "design drawing" stage. It includes photography, design, layout, production, and proofing. The core task is to create accurate graphic and text files based on final requirements and to prepare the printing plate.
2. Press (Printing): This is the "mass production" stage. The graphic and text information from the printing plate is transferred onto substrates such as paper or plastic in large quantities and with high precision. This is the technical part that will be highlighted below.
3. Post-press: This is the "finishing" stage. The printed semi-finished products are converted into final products through processes including lamination, foil stamping, die cutting, and binding, adding protection and aesthetics to the product.
Knowledge 2: Six Major Printing Processes – Each with Its Own Strengths
The core of the "press" stage lies in selecting the appropriate printing process. Each process has its unique technical principle and application areas.
Printing Process | Principle | Characteristics | Common Applications |
Lithography (Offset Printing) | The image and non-image areas are almost on the same plane, utilizing the principle that oil and water do not mix to transfer the image. | Convenient plate-making, low cost; the most widely used process. | Flyers, posters, commercial promotional materials, books and periodicals. |
Gravure Printing | The image areas are recessed (engraved or etched) and filled with ink; high pressure transfers the ink onto the substrate. | Thick ink layering, rich colour saturation, excellent gradation; suitable for long runs. | Flexible plastic packaging (e.g., potato chip bags), cigarette and alcohol packaging, postage stamps. |
Letterpress Printing | The image areas are raised, like a stamp, which is inked and then pressed directly onto the substrate. | Full ink colour, sharp edges, slight impression mark. | High-end business cards, invitations, letterhead/envelopes, self-adhesive labels. |
Screen Printing | The image areas have mesh openings that allow ink to pass through, while non-image areas are blocked. A squeegee forces ink through the mesh onto the substrate. | Very thick ink layer, vibrant colours, highly adaptable to substrate shape and material. | Textiles (T-shirts), large billboards, glass/metal/plastic products. |
Flexography (Flexo Printing) | Uses a flexible rubber or photopolymer raised plate; an anilox roller transfers fast-drying, low-viscosity ink. | Uses environmentally friendly inks, suitable for high-speed, high-volume printing; common in food packaging. | Food packaging bags, corrugated boxes, beverage labels, paper cups. |
Digital Printing | Computer files are directly sent to the printer for output; a non-contact printing method. | No plate-making, print-on-demand (even one copy), quick turnaround, supports variable data printing. | Personalised customisation, small batch orders, short-run quick printing, variable data labels. |
Knowledge 3: Four Major Packaging Materials – How to Choose?
Packaging material directly determines product protection, appearance, and cost. The four common types of packaging materials each have their advantages and disadvantages.
Paper & Paperboard: The most common and environmentally friendly choice, 100% recyclable. Disadvantages: not waterproof, limited strength.
Plastic: High formability, lightweight, durable, low cost, but difficult to degrade naturally.
Metal: Strong, durable, excellent barrier properties, can withstand extreme temperatures, but high production cost and heavy.
Glass: Chemically stable, non-toxic and odourless, preserves product flavour, can be recycled infinitely, but fragile and heavy.
Knowledge 4: Green & Environmental Sustainability
Under the global environmental trend, green printing and eco friendly packaging have become industry focal points.
Green Printing: Printing processes that use environmentally friendly materials and technologies. It emphasises environmental friendliness throughout the entire life cycle – from raw materials to production to recycling. Core concepts: "environmentally friendly" and "healthy/safe".
Eco-friendly Packaging:
Recyclable: Uses materials that can enter existing recycling systems and be reprocessed.
Biodegradable: Uses biobased plastics or natural fibres that can naturally degrade under specific conditions.
Reduce (Source reduction): Uses less material while maintaining protective performance, reducing waste.
Knowledge 5: Common Terminology & Test Standards
Understanding a few common industry terms and scientific test standards helps achieve more accurate communication.
Category | Term/Standard | Explanation |
Colour Process | Spot Colour | Pre-mixed special ink that produces more accurate and vibrant colours than four-colour process. |
Colour Process | Four-Colour Process (CMYK) | Uses four basic ink colours (Cyan, Magenta, Yellow, Black) overprinted to reproduce full-colour originals. |
Finishing Process | Lamination | Applying a thin transparent plastic film over the printed surface for water resistance, abrasion resistance, and protection. |
Finishing Process | Hot Foil Stamping (Gold/Silver) | Transferring metallic foil (gold, silver, etc.) onto the printed substrate using heat and pressure. |
Finishing Process | Die-cutting | Using a cutting die to cut printed sheets or paperboard into specific shapes according to design. |
Performance Test | Edge Crush Test (ECT) | Method for measuring the compression resistance of corrugated board. |
Performance Test | Dart Drop Impact Test | Method for evaluating the impact resistance of plastic film or thin sheet. |
Knowledge 6: Future Industry Trends
Currently, the printing and packaging industry is undergoing a profound paradigm shift. The core driving force has moved from cost efficiency to multi dimensional integration. Major trends include:
Deep Integration of Digitalisation & Intelligence: Digital printing is growing rapidly due to its on demand, variable data capabilities. By 2026, its market size is projected to reach USD 232.3 billion, accounting for 21.6% of the total printing market. At the same time, AI-driven smart factories are gradually becoming reality.
Green Transition: From Compliance to Proactive Innovation: Sustainability regulations are a major driver. Companies are exploring more circular solutions, such as developing novel bio-based and biodegradable materials.
Smart Packaging Creates New Value: Packaging is transforming from a product-protecting "container" into a "medium" connecting consumers and brands. For example, by integrating AR (augmented reality) or smart labels with unique identifiers, it enables interactive experiences, anti-counterfeiting, and traceability.
The knowledge system of the printing and packaging industry is vast. The above is just an introduction to several core dimensions. Would you like to dive deeper into printing processes, packaging materials, or industry trends? Let me know your area of interest, and I can provide more detailed explanations.
