Revolutionary cold transfer printing of printing technology

The invention of transfer printing dates back to the 1950s. This technique involves separating the ink layer from the paper under heat and pressure, allowing the design on the transfer paper to be transferred onto fabric, often referred to as the sublimation method. While this approach offers operational convenience, high-quality results, and relatively low equipment costs, it primarily uses disperse dyes for polyester fabrics. The range of available dyes is limited, and during the transfer process, many necessary dyes degrade into potentially carcinogenic aromatic amines. Additionally, because the inks used are solvent-based, recycling waste transfer paper is challenging, and the production of transfer paper generates significant environmental pollution. These issues prevent compliance with stringent eco-standards like the Oeko-Tex certification, limiting product competitiveness and making it difficult to overcome market green barriers. In contrast, cold transfer printing, which emerged as an alternative to traditional thermal transfer printing, presents a promising solution. Unlike conventional methods, cold transfer printing involves printing a suitable dye ink onto specialized paper to create a transfer printing paper. The fabric, after undergoing alkali treatment, is combined with the transfer paper and rolled through a transfer unit. Under pressure, the dye ink detaches from the paper and transfers the desired pattern or text onto the fabric. Hence, this method is also known as "wet transfer printing." Its process flow includes printing the design on the transfer paper, followed by the actual transfer onto the fabric, fixing the color, and washing off any excess. Cold transfer printing has broad applications, accommodating both woven and knitted fabrics such as cotton, linen, silk, and viscose. This technology aligns well with global trends emphasizing sustainability and environmental responsibility. In the context of China’s textile industry, where environmental protection and resource efficiency are increasingly prioritized, cold transfer printing stands out due to its innovative processes and environmental benefits. One of its key advantages lies in energy conservation and reduced emissions. Compared to traditional printing methods, cold transfer printing can save up to 65% in energy, reduce dye usage by 40%, and cut water consumption by two-thirds while achieving a 92% recovery rate for wastewater. The coloring process ensures a dye transfer rate of 95%, ensuring maximum dye utilization with minimal pollution. Furthermore, the omission of traditional hot printing steps—such as dyeing, rinsing, and bleaching—lowers production costs significantly. Another notable feature is its eco-friendly nature. By transitioning from single-release coatings to composite coatings, cold transfer printing can now achieve a transfer rate exceeding 95% without relying on paper carriers. The absence of urea in the printing paste minimizes air and water pollution, while the paste's permeability enhances dye transfer efficiency, boosts fixation rates, and reduces waste. This contributes to cleaner production practices and aligns with the principles outlined in the "Technical Policy for the Prevention and Control of Wastewater Pollution in the Printing and Dyeing Industry." Cold transfer printing also excels in responsiveness to market demands. Traditional printing involves multiple stages, from design to large-scale production, which can be time-consuming. In contrast, cold transfer printing simplifies these processes, enabling faster responses from initial design to final production. The resulting patterns are vivid, detailed, and versatile, offering rich photo-like effects akin to digital printing. Design flexibility allows for intricate details, varied colors, and even half-tones, making it ideal for modern fashion and home textiles. Moreover, cold transfer printing increases the fabric's value proposition.不受织物结构限制，无论是梭织还是针织面料，均可实现从薄至厚的印花效果。对于某些厚重紧密的面料，甚至可以采用双面两层打印纸实现双面印花，显著提升产品的附加值。 Overall, cold transfer printing represents a convergence of technological advancement, environmental sustainability, and aesthetic innovation. As a low-energy, low-emission solution, it marks a revolutionary step forward in the textile printing industry, meeting the growing demand for eco-conscious manufacturing and high-quality design.

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