Objective factors affecting the quality of printing products mainly consist of consumables, printing equipment, and printing environment, among others. A commonality among these factors is that they can be demanded and specified through objective evaluation methods.
Printing Consumables
Papers, inks, plates, and fountain solutions all possess unique properties that directly impact printing quality. Prior to printing, it's crucial to understand the characteristics and printability of various consumables to avoid factors that could negatively affect the printing process and to capitalize on properties that enhance it. Different printing products have varying requirements for print quality; while some packaging printing products demand vibrant colors, others, like book and magazine printing, require soft, non-irritating hues. When selecting printing materials, it's essential to consider the user's needs for the print product's appearance and identify the appropriate consumables for the job.
For printing various labels, it is advisable to choose high-white, smooth-surfaced, and opaque copperplate paper. Additionally, for products that need to be exposed to the outdoors for extended periods, the resistance to fading should be a key performance indicator to consider when selecting inks and paper. Sometimes, when offset printing different types of products, the required hardness of the rubber blanket varies, and targeted selection should be made accordingly.
By fully considering the existence of external factors that affect product quality and leveraging advantages while overcoming deficiencies in the production process, the quality of printed products can be improved to a certain extent.
Printing Equipment
The normal operation rate of equipment involved in the production process, the investment in various auxiliary equipment, and their matching relationships all have an impact on the quality of printed products. Any book, magazine, or packaging printed product is generally produced through several or even a dozen processes, including printing, binding, varnishing, hot stamping, and more. The operation of these processes is closely tied to the equipment, which affects the quality of the printed products. Factors such as the quality of the equipment, ease of operation, and the ability of the subsequent equipment to process the products from the previous equipment all contribute to the quality of the printed products.
If equipment frequently malfunctions, it cannot fully utilize its functions, leading to various quality defects in semi-finished products during printing or other processing operations. This, in turn, compromises product quality, which is crucial for maintaining high equipment uptime. Additionally, certain equipment has specific requirements for environmental and other objective factors during use. Failing to meet these demands directly impacts product quality. Therefore, ensuring the normal operation of equipment is beneficial for maintaining the quality of printed products.
Printing Environment
Environmental factors such as temperature, humidity, dust levels, and light exposure during the various stages of production, including printing, can significantly impact the quality of the printed product. Changes in the environment can affect printing, especially in offset printing, where fluctuations in humidity can lead to paper absorbing or losing moisture, causing warping and affecting the paper feeding and registration process during printing, thus reducing the quality of the printed product. Variations in temperature and the dust level in the printing environment can also impact the performance of inks and papers in offset printing, affecting the drying of the ink layer and color uniformity on the surface of the printed product, resulting in varying degrees of quality reduction.
Flexible printing and intaglio printing methods are more sensitive to changes in surrounding temperature and humidity. Excessive heat and low humidity are detrimental to the drying of inks, particularly water-based inks, leading to quality issues like smudging and flaking. Moreover, high dust levels can cause printing defects such as non-uniform printing on solid areas of the printed product.
During the printing process and all stages of processing the printed products, it is crucial to maintain constant environmental temperature and humidity, as well as reduce the dust level in the air. This ensures the stability of the printing quality. In summary, to guarantee the stable quality of printed products, one must avoid the adverse effects of negative factors on printing quality during actual production, fully exploit the promotional effects of positive factors. Only in this way can the stable quality of printed products be ensured.