Paper bags are widely used in clothing, food, shoes, gifts, alcohol, drugs and other areas of packaging. At present, we can use them a lot of paper divided into two types of mobile.
One is popular with ordinary paper bag packaging. Most of these paper bags with rotary printing, automated production lines to complete the bag, making the material more choice of kraft paper bags, paper size and pattern relatively inflexible, the advantage of high efficiency, suitable for mass production.
The other is beautiful, exquisite packaging, shopping bags. Generally use this type of paper sheet-fed printing, rely on manual or semi-automatic production of kraft paper, coated paper, cardboard, paper bags are often selected as the processing of materials. Most of them have high-end products for the packaging, gift bag or bags of various business activities of advertising. Features of any shape, size paper bag can be produced, but the process is relatively complex, low production efficiency. This paper specifically for this type of paper to discuss the hand bag in the production process.
The use of functional or design requirements, the mobile manufacturing process used in paper bag with a certain complexity, but the basic process can be summarized as follows:
Here we expand on this flow chart of the production process and bag some technology issues.
Paper bag paper bag design is the key link in the production process. Most paper products and corporate image is an extension of advertising strategies, the choice of materials, decoration techniques and forms of expression are associated with the use of paper bags and effectiveness are inextricably linked. Kraft’s toughness, high strength, rough surface. Jam good stiffness but the toughness is poor, as the surface of coated paper generally required. Coated paper has a certain toughness, printing, rich colors, but the stiffness worse than cardboard. More emphasis on durability choice in brown paper, to pay attention to color and stiffness are mostly used when the jam, and need rich gorgeous pictorial effect, people tend to prefer art paper. In order to improve the taste and quality hand bags, designers in India after the big brains on the surface decoration technology. Bronzing, UV, polishing, colorful, embossing and flocking process also makes flexible use of paper bags with bright colors, three-dimensional enhanced expression is more abundant. Of course, no matter what kind of finishing process, the designer should consider the economic use of paper materials, process design is reasonable. To produce and quality control, design of the production of a complete and clear operations engineering drawings is essential, in most cases need to go through proofing products are also recognized. Both the process of proofing the design of the verification, but also the basis for customer recognition and production of specimens.
Designed to lead into the cutting machine for drawing software or CAD, with a proofer proofing, in determining the size and other aspects can not be a problem, then the next step.
Paper bags with their corporate image is often an extension of commodity advertising strategy, and its design and general print different printing, spot color, full version more, with a large amount of ink, bright colors. So it’s printing technology and other product requirements are also different. Special attention to the printing ink to the operator control of balance adjustment of status is better equipment, or prone to ink from the bar, the color of the color problem. Some printing companies than the provincial billing paper and printing to come and go when you need to pay attention to the printing position up and down and to ensure the subsistence and, on paper at the bottom of the tongue and mouth size. Such as the need for coated products such as India must also pay attention to try to control the process ink film thickness and reduce the use of additives to minimize the use of powder.
India, also known as a plastic film, printed film lamination or India, is covered in the printing surface of 0.012 to 0.020 mm thick layer of transparent plastic film, paper and plastic to form a unity of the whole India finishing process, generally divided into two kinds of pre-coated and the coating process. Depending on the different thin film materials have high light film and the matt film of the points. With the use of environmentally friendly water-based solvents, environmentally friendly coating process has been further improved. Non-coated kraft paper bags use more technology, mainly because of the color film can increase the concentration of water to avoid pollution performance products, paper, anti-aging, tear resistance and other physical properties expose the general improvement in the fastness of paper and then and strength improved significantly enhanced capacity. In particular, the use of matt film to give people soft, high-end, comfortable feeling.
The coating process and bag points to note: ① Select the appropriate glue film, especially the full version of metal embossing ink products and the need for follow-up processing of cases; ② control the speed of film and choose the right sizing based on the amount of speed ; ③ products to be coated must be dry in order to cover India cooperation in trade, just coated products also need to be rolling for a while and then cut, bump processing; ④ printing, spray coating is too large for the former must also be in addition to powder operation; ⑤ strengthening effect on the membrane of the corona inspection. If you do not pay attention to control the above points, easily lead coated product stripping, blistering, pitting and other quality of accidents, and even lead to volume scrapped.
5) Surface finishing
Bronzing, UV, and other printed materials coating the surface finishing technology is widely used mobile paper production process. It is great to meet people on the bag’s beautiful, high-end pursuit. In the production process, good control of these processes must also be part of the key points.
Indian gold foil technology and strong compared to its metallic, consistency and bright color, three-dimensional richer. Bronzing bronzing effect depends on the perfect temperature, pressure and velocity of the organic coordination. Stamping operations of stamping should be concerned about the effect of the following factors: ① stamping products, surface roughness; ② stamping the surface of printed products post treatment (covered, over oil); ③ the hot foil used in India adaptive; ④ version and foil-stamping machine stamping the status. Stamping is a complex technology, in the stamping process to fully consider the above factors, stamping it be possible to achieve satisfactory results.
Mainly refers to the surface of the polishing process on UV light and ordinary glazing. Polishing process can make good gloss printing effects and improve anti-wear resistance of the surface of printed materials, in particular the local UV light and UV coating on the process in the use of paper bags, so thick and dense layers of printing paper , moisture rich gloss, printing prominent theme, look and feel strong.
In addition, the bump, colorful, flocking, and other printed materials Paper bags are also finishing process to obtain a degree of technology use, the use of these processes not only improve the aesthetics of paper bags and fashion, but also cultivate a user interest in life. We must also control the operation of technical essentials of these processes, which play the efficacy of icing on the cake
6) Die-cutting process
Cutting process is the combination of cutting knives and knife indentation on the template used in the same piece of die-cutting machine for cutting of printed materials and processing technology indentation method, also known as “rolling marks.” It is in the process of a paper bag production important process. Directly affects the quality of cutting the quality of paper and hand molding paste system efficiency.
Paper bags should pay attention to the die-cutting process: ① choose the correct template. Since the majority of paper similar shape, size change some little pieces of work must make the first drawings were reviewed in order to avoid the wrong template. ② control the working pressure. Requires cutting edge can not have glitches, dark line clearly better off but also to avoid deep-fried line. Some part of the paper cutting can not see when the dark line, but hand-off occurs when the bags burst paste system, so try to keep die-off during the process of testing to do. ③ consider the characteristics of paper, silk thread along the direction of the paper, paper is better off, molding pressure can be smaller, while the direction perpendicular to the paper, silk thread, paper folding can be more difficult to increase the compression pressure in the local. ④ jam poor toughness, such as when there is no surface film, with particular attention to cutting effect.
7) Paste box
Paste system and bag production process is the most special link. In addition to supporting the use of some semi-automatic equipment, mainly depends on manual completion of the entire paper process in the least efficient link. Demand in developed countries and bag a huge fine, because they can not be completed through the automated production line, so there is a lot of printing and packaging enterprises in China’s exports of paper products provides a business opportunity.
Paper bags must first make a paste made the first pieces of technology planning. ① According to the paper the appropriate choice of adhesive materials. Many paper plants due to lack of technology experience, often caused by improper selection of the adhesive stick a plastic bag off. Export of container in the paper need to adapt to the possible high-temperature 50 ~ 60 ℃ and the Use of 20 ~ 30 ℃ below zero low temperature test, but must also consider the aging of adhesive factors. ② the construction paper and handle forms and other materials and links for a variety of paper products, we will have to investigate specific cases based on the manual process using appropriate methods. Before the system will need to paste some red handle mounting hole, and some system in the process of paste to use hot fixed mobile and so on. These hand-made paste the planning process needs to be completed before production, and once the confirmation process, we should strengthen the process of manually paste the details of the system controls to prevent pollution and avoid the production of excess plastic bag in the surface scratches and so on. Of course, pasting pieces of the system produced the first batch of prenatal proofing can refer to when planning for process re-evaluation process.
Paste done by hand and bag system has basically been formed, there are some final steps hand bag – punching, wearing rope and other operations to complete the final molding and bag packaging