Description

1.Technical details

2、 Product Features

1.Ability to produce industrially at high speed

The traditional printing equipment is difficult to meet the market demand for the trend of “small batch, multiple batch, urgent delivery” orders in the packaging and printing industry due to the long plate making time and low order changing efficiency. Adopting industrial-grade inkjet system, the professional paper bag digital printing machine can realise efficient production with continuous printing speed of 0-40 meters per minute. The production capacity of some high-speed models can reach 80 meters per minute, which has effectively supported the large-scale delivery of large quantities of paper bag orders in mass production testing.

Digital printing does not require the preparation of plates, and the conversion from electronic files to finished paper bags can take just minutes, removing the time-consuming process of plate changing, matching and colour adjustment in traditional printing. This technology allows the same production line to easily switch between different size paper bag orders and printing content, improving the overall order switching efficiency of paper bag production enterprises by several times, and meeting the dual needs of brand customers for personalised packaging and fast delivery.

2.High accuracy printing and multi information encoding ability

The paper bag digital printing machine adopts high-definition nozzle with the resolution of 1200dpi or higher. The four-color printing system of CMYK can accurately restore the design details, with natural colour transition and high saturation. The testing standards consider 600dpi resolution to be qualified and 1200dpi and above as excellent. High end nozzles can print 1200 × 1200dpi with high accuracy, and small characters of 2PT size are clearly reproduced. The precision achieved here allows for the reproduction of complex brand patterns, delicate gradients and intricate graphic designs, thus significantly improving the visual transmission of paper bags as a brand medium.

In the aspect of coding information printing, the paper bag digital printing machine supports full printing of one-dimensional codes, two-dimensional codes, QR codes, DataMatrix codes, anti-counterfeiting codes, custom numbers, text, serial numbers, and database link information. The printing quality of QR codes is in accordance with the ISO/IEC 15415 international standard, which assesses the grading of 2D barcode printing quality based on key parameters such as clarity, size, contrast, and symbol edge definition. The paper bag digital printing machine is able to provide a full chain technical guarantee from printing to verification for product traceability, logistics tracking, anti-counterfeiting marketing and other application scenarios.

3.Material Compatibility and Print Quality Assurance

The paper bag digital printing machine has an upward suck-feeding system that can feed all types of paper with thickness of 1.0-5.0 millimetres and weight of 80-600 grams. The material range includes kraft paper, corrugated paper, speciality paper, cotton paper, rice paper and other absorbent materials, to achieve comprehensive coverage from lightweight liner paper to thick packaging paper bags. For difficult substrates such as kraft paper with high ink absorption and rough surface, the equipment optimises the ink formula and adjusts the inkjet parameters to effectively avoid problems such as ink flying and plate sticking, so as to ensure clear edges and saturated colours of the printed pattern.

The integration of plasma surface treatment technology has further enhanced the printing quality. This technology is plasma surface pretreatment of paper before printing, which removes pollutants such as oil, grease and oxides, and changes surface properties to improve wetting and adhesion. Atmospheric pressure plasma treatment enables solvent-free ink to adhere to the paper surface, greatly improving the wear resistance and weather resistance of printed patterns and greatly improving the glossiness and colour expression of ink. Compared with traditional corona treatment, atmospheric pressure plasma technology has uniform treatment effect, no electric potential and can safely handle thermosensitive materials without damaging the substrate itself.

4.Intelligent detection and quality control system

The paper bag digital printing machine is equipped with a complete online read-write detection and quality control system. During the production process, the equipment can detect the printing content of each paper bag in real time, and automatically check the completeness and accuracy of the encoding. In case of detection of non-conforming labels or missing codes, an automatic rejection mechanism is enabled to separate non-conforming products from the production line and prevent them from flowing into subsequent packaging processes. In the meantime, the equipment has an automatic coding function to complement missing information in real time when the equipment detects coding gaps or incomplete information during the continuous production process, so as to ensure the integrity of the data chain of each finished product, and effectively prevent the batch quality problems caused by printing omissions or errors.

3.Application scenarios

Scenario 1: Food delivery paper bags and food grade packaging

The catering industry has very high requirements for paper bag printing. The printed matter needs to directly contact food or closely contact food . Order updates are frequent and the delivery cycle is short . This machine is using water based environmentally friendly pigment ink, benzene free and heavy metal free, fully meet the safety standards for food packaging. The printing process does not generate harmful solvent volatilisation, and the paper bags are safe for storing food such as barbecue, baking, fast food, etc. The plasma surface treatment technology makes the ink firmly attach to the paper fibre. Even if the high temperature is baked, the pattern is clear, and it will not fade after refrigerating freezing.

Specific applications include: barbecue paper bags (high temperature resistance, oil penetration resistance), toast bags (packaging for baked goods, requiring food safety certification), food delivery tote bags (printing brand logos and promotional information), customised paper bags for restaurants (printing daily featured menus, supporting quick switching in small batches), printing of shelf life and traceability QR codes for refrigerated food packaging bags.

Scenario 2: Paper bags for packaging of agricultural products and seed packaging

Seed packaging paper bags, agricultural product transportation bags, etc. are increasingly relying on anti-counterfeiting traceability. Each packet of seeds and each box of agricultural products must bear traceable product codes, variety information, origin, and production dates. The device has the function of variable data printing, it can automatically generate unique serial number, QR code and database link information on different paper bags, so as to realise the “one bag, one code” full traceability system.

For example, the equipment can print the name of the variety, production batch number, expiration date and anti-counterfeiting QR code at the same time on seed packaging paper bags. When the code is scanned, it can be mapped to the enterprise database and get all the traceability information. At the same time, the read-write detection system detects the coding information of each paper bag in real time, so as to ensure the batch is complete and error-free, and avoid the traceability breakage caused by incomplete printing or repeated coding. Through this system, agricultural product export enterprises can meet the legal and compliance requirements of the destination country’s market for packaging labelling, reducing the risk of export returns due to incomplete packaging information.

Case 3: Kraft Paper Packaging + Cultural Innovation

For high-end cultural paper products such as invitations, envelopes, and Xuan paper packaging, very high printing accuracy and colour reproduction are required. The device can output high resolution of 1200dpi, showing delicate lines, gradient transitions and rich colour layers clearly. Plasma pretreatment makes the ink evenly diffused on the light and thin paper with strong water absorption property such as rice paper and cotton paper, avoiding ink leakage and plate sticking. So that the edges of pattern are sharp and the colours are full. The above materials are the best printing carrier to absorbent materials like rice paper, cotton paper.

The device supports multi order layout printing, which can merge short version orders from multiple different customers for production, maximise the material utilisation and significantly reduce the unit cost. This flexible production capability enables creative design studios, cultural and creative brands or individual customisation businesses to achieve small batch customisation of high-quality paper products without high plate making costs.

Scenario 4: Zipper bags for industry and retail; kraft paper bags

Kraft paper bags are among the most widely used types of packaging in industrial packaging and retail shopping. The device is specially optimised for the ink absorbing properties of kraft paper material, with even ink penetration, fast drying and surface pattern is firm and wear-resistant. Paper bags can print QR codes, bar codes, variable serial numbers and other functions at a time, to meet the industrial needs such as logistics sorting, inventory management and anti-counterfeiting traceability.

For example, the zipper bag, due to its self sealing structure, has higher requirements for printing register accuracy. The equipment with pagination feeding system and automatic bias levelling mechanism ensures that the paper bag is accurately positioned when passing through the printing area, avoiding pattern deviation or one-dimensional code scanning failure caused by paper deviation. The printing application of corrugated cardboard boxes is also applicable for this equipment. The surface of corrugated cardboard has a concave-convex structure which is a challenge for the uniformity of inkjet printing. Inkjet parameters and plasma pretreatment are adjusted to obtain the ink adhesion and pattern integrity.

The global digital printing and packaging market is booming with a market size of around $8.5 billion in 2024 and expected to reach $19.2 billion by 2031. The personalised upgrade of brand packaging and the continuous advancement of environmental policies have made digital printing of paper bags the core growth track of the packaging printing industry. Based in Shenzhen, China, one of the main centers of the global packaging manufacturing industry, we are committed to providing high-performance and high-reliability digital printing solutions for paper bags to overseas markets, and helping global customers to build core competitiveness in digital transformation.