Process Technology Control of Batch Book Product Quality

The production process of books and publications is: type sheet - printing - printing - binding. In order to ensure the improvement of product quality, in the process of product printing, we will do a good job of on-site resolution of process management, process quality control and process quality problems, so that personnel, equipment, raw and auxiliary materials, methods, and environmental factors that affect product quality are always Being in a controlled state is an important condition and guarantee for the improvement of the overall product quality level. Therefore, in the production process, it is necessary to carefully analyze the factors affecting the quality of each process. It is of great significance to actively take measures to improve the quality of books and periodicals, improve the economic benefits of enterprises, and enhance the core competitiveness of enterprises. .

First, we must pay attention to strengthening the source control of product quality

Only the strict control of the quality of raw materials can ensure the quality of books and periodicals. We know that the quality of raw materials directly affects the processing quality of books and periodicals. It can be said that raw materials are the source of quality control of books and periodicals and are very important.

Materials include printing materials and binding materials such as raw materials and accessories, mainly refers to films, plates, paper, ink, blankets, hot melt adhesives. The quality of raw and auxiliary materials will directly affect the quality of books and printed products. If the quality of raw materials is too poor, it will lead to "embroidery sacks embroidered and the background is too poor." Film quality should pay attention to uniform film, black solid meet the requirements. The plate (PS plate) substrate should have good hydrophilicity, and the photosensitive coating must have strong adsorption capacity, and be even and smooth. After exposure and development, there should be no smears and the stability of the batch is better. For paper, pay attention to the flatness, surface strength, water absorption, ink absorption performance, whiteness, etc., use less "hot pan paper" to avoid loading edges, tight edges, and dead folds; avoid translucent shadows, print-through, hair loss Dropping powder pile rubber etc.; if the hair off powder, not only seriously affect the quality of the product, but also increase the speed of the plate, reduce the life of the plate, and increase costs. For web, pay attention to tensile strength, uniform rewinding, consistent tension, etc., avoid uneven tension or rewinding and produce “run-out” phenomenon, resulting in inaccurate registration, or insufficient tensile strength resulting in breakage packs. Rubber, crushed rubber blankets and so on. Blanket should pay attention to elasticity and recovery, ink should pay attention to water resistance, adhesion, dryness, blackness, viscosity and so on. Binding materials should pay special attention to the quality of hot melt adhesives, and some hot melt adhesives are too brittle and some drawing should be serious. If the quality of hot melt adhesives is not good, it may cause loose sheets and cause unqualified batch products. Therefore, when purchasing raw and auxiliary materials, we must strictly check and compare with the quality. Only by making good materials available can we ensure product quality.

In addition, the proper storage of raw materials will also affect the processing quality of books and publications. For example, paper acceptance, temperature and humidity, and the environment in which they are stored will directly affect the physical properties of paper, resulting in diminished printability. Will affect the quality of books and products. Therefore, according to the actual situation of the enterprise, it is necessary to purchase some necessary inspection instruments and carry out inspection and acceptance according to the quality standards of raw materials. It is worthwhile to carry out effective inspection, control, and safekeeping of the raw materials that have been put in storage. Through the implementation of inspection and control measures, enterprises can make scientific and accurate detection of the quality of raw materials, fundamentally eliminate unqualified raw materials, ensure the processing quality of books and periodicals, and effectively control the source quality of production.

Second, we must pay attention to the printing technology of good products

Process Technology Control:

The modern printing process presents a very unstable situation. There are three reasons for this: First, the constant updating of printing equipment has prompted the continuous change of the production process in the printing industry to meet the needs of technical equipment; Second, with the printing market of books and periodicals With the increasingly fierce competition, new and unusual design concepts for book publication are constantly appearing in the form of publications. This brings new requirements to the printing process and increases the difficulty of the process. Process design work must be done by professionals, and to do fine, do a good job. Its task is to make detailed arrangements for each detail from the choice of materials, materials, to finished products, and to understand what kind of process quality problems are likely to arise. Its role is to reduce the consumption of raw materials; second is to reduce the occurrence of quality accidents and eliminate quality accidents before production. Third, the changes in the distribution and sales markets, the diversity of market demands, and the improvement of the aesthetic capabilities of readers have made publications more demanding on packaging and decoration. Publishing units have endeavored to improve the process, increase the process design, define the task of process design, and become the printing of books and periodicals. An important task.

Image processing, swatches, plate control:

Shaiban is the most important part of printing, and it is also the key process for quality control. The quality plate is a necessary condition for producing high-quality products. From our production experience in recent years, to ensure the quality of printing plates, we should grasp the following main factors that affect the quality of printing plates:

(1). Documents: Foreign documents and book printing enterprises shall determine the person's manuscripts to be adjusted according to the company's color management specification so as to unify the colors and styles. Including: carefully check the file page text and pictures because of software compatibility errors, uniform and accurate calibration of the file, adjustment of image tone and sharpness, unified layout (sets) of book layout style and binding style.

(2) Pattern: Before the printing, we must carry out a serious quality inspection on the pattern, especially for overprinting accuracy, clear text, smooth dots, and the type of stains, scratches and other aspects of comprehensive and meticulous quality checks, guarantee Tablet quality. For the factors affecting the quality of printing plates mentioned above, technical measures, such as spelling or recopying, must be taken before the printing, and the necessary technical processing shall be carried out to ensure that it meets the quality requirements of printing plates.

(3) Printing plate: Knowing the technical performance of the printing plate is the main condition for ensuring the printing quality. Due to technical differences in the technical quality of different batches of PS plates, it is necessary to perform the necessary technical performance tests for each batch of plates before investing heavily in the use of plates. On this basis, determine the basic technical parameters of exposure, development time, developer concentration, and conduct standardized, data-based operations to ensure that the quality of the printing plate is stable and reliable.

(4)、Sketch: The common troubles of printing are mainly stains, false dots, and text graffiti. Because of the complexity of the factors that produce these failures. Therefore, in the print quality control, specific analysis should be carried out for different quality issues, identify the specific reasons, and take appropriate technical measures. For example, “stains” are often caused by dust, pattern spots, or scratches on the printing plate. In the printing, the printing plate glass should be wiped clean or used for two different reasons. Exposure processing.

The pre-press plate making process is the gestation process of the product forming. In this process, if any one step is not well controlled, the quality of the printed matter may be affected. In addition to the previously mentioned, there are many other factors that may cause problems in the printing, causing a lot of losses, such as the temperature and humidity control of the operating environment, equipment maintenance and the quality of raw materials. Therefore, for any one subtle link can not be taken care of, only the control of each step in order to provide qualified products for the printing process, to provide quality assurance for binding and other post-processing processes.

Printing process control:

To improve the quality of batch products, printing is the key. From the problems existing in the printing production process of books and periodicals, factors that affect product quality mainly include paper, ink, operators, and equipment, and the difficulties in the resulting printing technology will also restrict the improvement and improvement of product quality. Under the current production technology conditions, the quality control of the printing process should be strengthened. The focus should be on the following: First, to further improve the printing quality management methods and systems that have been effective for a long time; to adhere to the combined quality control methods of prevention and inspection; Site management. In the internal management of the workshop, strict adherence should be adhered to: 1. No printing for three jobs; 2. Inspection and signing system; 3. Machine quality responsibility system. The second is to actively explore and summarize the adaptability of paper inks and the compatibility of personnel and equipment in response to new issues such as the existence of impacts in the printing industry in recent years and the process technologies that restrict the improvement of product quality levels. Through these solutions, the technical problems are solved. Promote product quality improvement. Focus on the following controls that affect quality factors:

(1), paper:

The quality of paper printability is an important factor that restricts the improvement of product quality. Usually, the quality problems caused by paper problems are:

1, the phenomenon of severe paper discounts;

2, paper off powder, fade, heap rubber serious;

3, paper with static electricity caused by frequent machine downtime, the same batch of product printing uniformity is poor;

4. Inconsistent paper thickness, short storage period, telescopic deformation, resulting in inaccurate overprinting, and difficulties in printing, especially equipment with low equipment performance are not allowed to register in printing, and the phenomenon of rejection of the angle is serious.

For the above-mentioned adverse effect on the product quality caused by the paper problem, the following methods can generally be used for quality control in terms of process technology:

1, pre-printed with humidity treatment, after the paper arrives at the workshop, it is cooled and cooled to make it balanced and stable with the temperature of the workshop, so that the moisture distribution of each part of the paper is even;

2, in the printing control of the layout of water, reduce the paper expansion;

3. Spray water mist on dry, electrostatically charged paper to eliminate static electricity;

4, understand the printability of different batches of paper, according to the performance of printing equipment on the suitability of different batches of paper for reasonable production arrangements.

(2) Ink:

In the production process of books and magazines, the problems of loose powder and pile rubber are predominantly caused by rough paper and soft texture, and are also closely related to the viscosity of the printing ink. The relationship between the viscosity of the ink and the tensile strength of the surface under the paper surface is relevant. To prevent the paper from falling, firstly reduce the viscosity of the ink, that is, dilute the ink, add and release additives, and adjust the printing pressure appropriately so that the paper and ink viscosity match best.

(3) Equipment:

Strengthening equipment maintenance and proper operation and use are of great significance in the production of books and periodicals. Due to the busy-season characteristics of the production of books and periodicals, equipment maintenance is often neglected during peak seasons, and problems with product quality due to poor equipment conditions also occur from time to time. Therefore, paying attention to and strengthening equipment maintenance, commissioning, and routine maintenance are the inevitable requirements for improving product quality. Strengthening the equipment maintenance system during production, establishing equipment inspection system, and systematically overhauling the equipment can not only create a good quality for production. The conditions can also provide guarantees for the improvement of product quality.

(4) Personnel:

Among the many factors that affect product quality, personnel (including the team) have a decisive influence on the improvement of the quality level. We have compared the quality of appraisal products and other bulk products in recent years. It is shown that most of the factors affecting product quality are related to the quality of work of people, especially their sense of responsibility. Therefore, to improve product quality, it is necessary to strengthen the quality awareness of personnel at all levels, especially the quality training and education of machine operators. At the same time, we must establish strict quality management measures and systems, and strengthen on-site management and team leader and leader to print process semi-finished products. Responsibility for quality control and assurance, clear goals for quality performance assessment, and improve quality organization.

Third, we must focus on the formation of a good product control:

Stapling as the final process of making a printing system, its quality directly affects the quality of finished products and the reputation of the enterprise. Therefore, before mass production, it is necessary to be familiar with the construction requirements and the quality of the materials used, first bind the sample books, and then mass-produce them after quality inspection. Mass product quality control should be:

(1) Strengthen the responsibility of operators in all processes;

(2) Strengthen technical quality training and site management;

(3) Organize special persons to conduct sampling inspections;

(4) Strict process discipline and technical requirements are required to enable the orderly production of each process. In addition, the active promotion of scientific sampling inspection methods, careful inspection of different sampling plans for batch products, strengthening the quality control of the binding process, and preventing the unqualified products from leaving the factory are an effective management method to ensure the improvement of the quality of bulk products. one.

In view of the above, product quality is a systematic project involving various processes and multi-factors. It requires the cooperation and joint efforts of publishing, printing, material supply and other related departments. To improve product quality, for printing companies, the work to be done is multi-level and all-round. We must not only focus on the formulation of quality policies and policies, but also on the establishment and improvement of quality systems. The standardization and standardization management of the quality of the assembly process starts from the production technology of the company and improves and perfects the process technology and quality management. In this sense, the role of improving product quality should be comprehensive, and not just the content of the quality department. Of course, as a quality management department, strict process control should be carried out on many quality problems and actively explore effective methods. Quality management methods, change of traditional management, and management of quantitative indicators have important quality monitoring and guarantee functions.