Portable paper bags are widely used in the packaging of commodities in the fields of clothing, food, footwear, gifts, tobacco, alcohol and medicine. At present, we can categorize these heavily used portable paper bags into two categories.
The first category is the general paper bags for packaging. Most of these paper bags are made by rotary printing and automatic production lines. The paper bags are mostly made of kraft paper. The specifications and patterns of the paper bags are dull. The advantage is that the production efficiency is high and it is suitable for mass production.
The other category is beautiful, exquisite packaging and shopping bags. This type of paper bag is generally printed on a single sheet of paper and relies on manual or semi-automatic production. Kraft paper, coated paper, and cardboard are often selected as materials for processing paper bags. Most of them are used for packaging of high-end goods, gift bags or advertising bags for various commercial activities. The characteristic is that paper bags of any shape and specifications can be produced, but the process is more complicated and the production efficiency is low. This article discusses the production process of portable paper bags specifically for this type of paper bags.
Due to the use function or design requirements, the production process used in portable paper bags has a certain complexity, but the basic process can be summarized as follows:
Next, we will discuss some process problems in the production process of portable paper bags based on this process flow chart.
1. Design
The design and manufacture of paper bags is a key part of the entire paper bag production process. Most paper bags are an extension of corporate image and merchandise advertising strategy, so the materials used, decoration techniques and forms of expression are inseparable from the use and efficacy of paper bags. Kraft paper has good toughness, high strength and rough surface. The cardboard has good stiffness but poor toughness, and it is usually used as a paper bag for surface coating. Coated paper has certain toughness and rich printing colors, but its stiffness is worse than cardboard. Emphasizing durability, more choices are made of kraft paper. When color and stiffness are important, cardboard is used, but rich and colorful patterns are needed. People often prefer coated paper. In order to improve the taste and grade of the paper bag, the designers used their brains in the post-press surface decoration process. The flexible use of bronzing, UV, glazing, colorful, bumps and flocking also makes the paper bags brighter in color, three-dimensional, and more expressive. Of course, no matter what finishing process is used, the designer should consider the economic use of paper materials and the rationality of the process design. For production and quality control, it is necessary to produce a complete and clear set of engineering drawings during design. In most cases, the product needs to be confirmed by proofing. Proofing in the design is not only the verification of the process, but also the basis of customer confirmation and the specimens produced. [next]
2. Printing
Handy paper bags are often an extension of corporate image and product advertising strategy. Its printing design is different from general prints. It has more spot colors and full editions. It uses a large amount of ink and has bright colors. Therefore, its printing process is also different from other product requirements. The printing operator should pay special attention to the control of water and ink balance, and the state of equipment adjustment should be better, otherwise the problems of ink and ink color fluctuations will easily occur. Some printing companies use less paper for billing, and pay attention to the up and down printing positions when printing to ensure the size of the paper bag and the upper tongue and bottom. If the product needs to be processed after printing, it must also be controlled as much as possible to reduce the thickness of the ink layer, reduce the use of additives, and minimize the use of powder.
3. Laminating
Laminating film, also known as over-printing after printing, post-printing laminating or post-pressing film, refers to covering the surface of the printed product with a layer of 0.012-0.020? Thick transparent plastic film to form a paper-plastic integrated post-print finishing The process is generally divided into two processes: pre-coating and instant coating. There are high-gloss film and matt film according to the different materials used. With the use of environmentally friendly water-based solvents, the environmental protection of the coating process has been further improved. The non-kraft paper bags mostly use the coating process, mainly because the coating can increase the concentration of color, the product has good waterproof and anti-fouling performance, and the physical properties of the paper such as aging resistance, tear resistance, and puncture resistance are generally improved. The strength is improved and the bearing capacity is significantly enhanced. Especially the use of matt film can give people a soft, high-end, comfortable feeling.
Pay attention to several points in the laminating process of the portable paper bag: ①Select the appropriate laminating glue, especially the full version of the metal ink product and the situation where subsequent bump processing is required; ② Control the laminating speed and select the appropriate amount of sizing according to the vehicle speed; ③The products that need to be coated must be dried after printing to be coated. The products that have just been coated also need to be placed for a period of time before rolling, bumping and processing; ④If the powder is too large during printing, it must be processed before coating. Powder removal operation; ⑤ Strengthen the inspection of the corona effect of the film, etc. If you do not pay attention to the control of the above points, it is easy to cause quality accidents such as stripping, blistering and pitting of the coated products, and even lead to batch scrapping.
4. Surface finishing
Hot stamping, UV, glazing and other printing surface finishing processes are widely used production processes for portable paper bags. It greatly meets people's pursuit of exquisite and high-end paper bags. In the production process, we must also control the key points in these process links.
Compared with printed gold, the hot stamping process has a strong metal feeling, good consistency, bright color and rich three-dimensional sense. The perfect bronzing effect depends on the organic coordination of bronzing temperature, pressure and speed. The following factors should be paid attention to during the hot stamping operation: â‘ The flatness of the surface of the hot stamped product; â‘¡The post-printing process of the hot stamped product surface (film, oil, etc.); â‘¢The hot stamping of the anodized aluminum used Printability; â‘£Hot stamping plate and hot stamping machine status, etc. Hot stamping is a complicated process technology, and it is possible to achieve satisfactory hot stamping effects by fully considering the influence of the above factors during the hot stamping process.
The surface glazing process mainly refers to UV glazing and ordinary glazing. The glazing process can maintain good gloss effect and improve the surface wear resistance of the printed product, especially the use of UV glazing and local UV glazing in the paper bag processing process, making the printing layer of the paper bag thick, dense and shiny Rich and moist, the printing theme is outstanding and the impression is strong.
In addition, uneven printing, colorful, flocking and other printing finishing techniques are also used to a certain extent in the paper bag process. The use of these processes not only improves the beauty and fashion of the paper bag, but also cultivates the user's life interest . We must also control these process operation techniques to play the icing on the cake. [next]
5. Die cutting
The die-cutting process is a process method that combines the die-cutting knife and the indentation knife on the same template with a die-cutting machine to perform die cutting and indentation processing on the printed product, also known as "rolling marks". It is an important process in the production process of paper bags. The quality of die cutting directly affects the quality of paper bag forming and the efficiency of manual pasting.
Pay attention to the die-cutting process of portable paper bags: â‘ Select the correct template. Since most paper bags are similar in shape and some have little change in size, the first article must be checked against the engineering drawings during the operation to avoid using the wrong template. â‘¡ Control the working pressure. It is required that the die-cut edge should not have burrs, the dark line is clear and easy to fold, but the line should be avoided. In some paper bags, there is no problem with the dark lines during die cutting, but when the bag is folded manually, it will break. Therefore, during the die cutting process, it is necessary to constantly try to fold and do the process inspection. â‘¢ Considering the characteristics of the paper, the paper is easier to fold along the direction of the paper, and the molding pressure can be smaller, while perpendicular to the direction of the paper, the paper is more difficult to fold and the molding pressure can be increased locally. â‘£The toughness of the cardboard is poor. If there is no surface coating, special attention should be paid to the die-cutting effect.
6. Paste Box
The pasting process is the most special link in the production of portable paper bags. In addition to the auxiliary use of some semi-automatic equipment, it mainly relies on manual completion, which is the least efficient part of the entire paper bag process. The demand for exquisite hand-made paper bags in developed countries is particularly huge, because they cannot be completed through automated production lines, so it provides business opportunities for the export of paper bag products of many printing and packaging companies in China.
The first paper crafting plan must be done for the gluing of portable paper bags. ①Select the appropriate adhesive according to the material of the paper bag. Many paper bag factories have inadequate process experience, often due to the improper selection of adhesives, which leads to the false sticking of paper bags. Export paper bags need to adapt to the possible high temperature of 50-60 ℃ in the container and the low temperature test of minus 20-30 ℃ at the place of use. At the same time, the aging factors of the adhesive must also be considered. ②The structure of the paper bag, the material of the handle and the connection form are various for the paper bag products, and we need to discuss the use of appropriate manual process methods according to the specific situation. Some need to punch the mounting hole of the handle before gluing, and some need to use hot-melt adhesive to fix the hand in the process of gluing. The planning of these manual pasting processes needs to be completed before mass production, and once the process is confirmed, we should also strengthen the details of the control during the manual pasting process to prevent spilled glue pollution and avoid scratches on the surface of the paper bag in production. Of course, the first production of paper bags before mass production can refer to the process planning at the time of proofing for process re-evaluation.
The hand-made paper bags that have been manually pasted have basically been formed, and some hand-made paper bags have the last process-punching, stringing, etc., to complete the final packaging of the hand-made paper bags.
Through the above analysis and discussion of the process flow of portable paper bags, we know that exquisite and stylish portable paper bags are finally completed by a series of complex technological processes. Any negligence in any process can lead to production quality accidents. The rigor of the process is a necessary condition to ensure the quality of the product. In the entire process flow, we must strengthen the evaluation management of the process and the implementation of the first piece confirmation procedure before the mass production of each process, and at the same time, strictly track and control the production process. Any perfect craftsmanship must rely on strict execution of craftwork procedures to ensure that the production of portable paper bags is no exception.
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