Talking about the advantages of using adhesive in flexible packaging

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With the development of composite soft materials in China, the composite poly-alkaline adhesive has also passed the history of more than 20 years. Since the mid-1970s, Shanghai first developed the use of extrusion coating and extrusion compounding to make simple composite soft packaging materials for food. In the late 1970s, it first developed a dry compounding method to make higher-grade products. Composite soft packaging materials for food, from composite soft packaging materials for general simple foods to plastic/plastic retort pouches resistant to high temperature cooking at 121 ° C for 40 minutes and more advanced aluminum / plastic retort pouches. At the same time, dry composite adhesives were also developed simultaneously.

We know that dry-packaged composite packaging materials are used in addition to various plastic film and aluminum foil substrates. The first to be used is a one-component solvent-based pressure-sensitive adhesive made of butyl rubber. It can be combined with PET, PT and PE to make the simplest and most original composite flexible packaging material. Compresses the packaging aspects of biscuits, candies and mustard. By the end of the 1970s, due to the development of a retort pouch resistant to 121 ° C for 40 minutes, the one-component pressure-sensitive adhesive was obviously not acceptable. Therefore, Shanghai first developed a two-component high-performance polyurethane adhesive. Of course, this kind of adhesive has already been industrialized in China in the 1960s, because its performance does not meet the requirements of composite flexible packaging, there are high boiling point of solvent, serious odor, too much residual monomer, and no hygienic performance. Reliable, too low initial adhesion, etc., can not be used in dry compounding to produce qualified food packaging materials, so it is necessary to re-develop research in line with the level of the United States and Japan at that time, in line with food hygiene and safety, can withstand 121 ° C40 Minute-cooked two-component polyurethane adhesive. After more than two years of research, it finally passed the appraisal of the State Science and Technology Commission and the Ministry of Light Industry in August 1981, and completed this task.

Since 1980, China has gradually reformed and opened up, the people's living standards have improved remarkably, the market economy has become increasingly active, the food industry has developed rapidly, the main and non-staple foods have become increasingly abundant, and the call for perfect packaging has also increased. The demand for composite flexible packaging materials is high. Therefore, Shanghai, Wuxi and Dalian first introduced a relatively advanced production line of composite flexible packaging materials from Japan, including multi-color combined gravure color printing machine, dry laminating machine, bag making machine, slitting machine and corresponding testing instruments. The development of China's modern composite flexible packaging industry has taken the lead. However, gravure inks, adhesives, PET, OPP, OPA, CPP, aluminum foil, etc. required for the production of composite flexible packaging materials must be imported.

Therefore, despite the large output and many users, there are opinions on the product. Some large factories are willing to purchase and use adhesives produced in Germany, Japan, the United States and France at a high price.

Since the late 1980s, researchers in Shanghai have studied functional adhesives in addition to the FDA-approved aliphatic high-temperature resistant cooking rubber that fills the domestic gap. The purpose is to solve the problem of Sichuan mustard and Zhejiang mustard soft packaging bags. Quality issues. Originally, the OPP/AL/PE type mustard bag made of the domestic adhesive at that time, because the adhesive is not resistant to acid, salty and spicy corrosion, the packaged mustard was soaked in hot water at 80-90 °C for 10 minutes, the inner layer PE and AL The stratification has been automatically stratified, resulting in the need to break the bag and leak out of the mustard after the sale of the mustard. The mustard production plant claims to the packaging material factory. After about two years, Shanghai Shenhua Technology Co., Ltd. first introduced to the market a special anti-acid and salty medium corrosion resistant aluminum foil adhesive that can withstand 100 °C boiled adhesive in 1991. It was used by Zhejiang and Fuling Color Printing Factory. Into the mustard packaging bag, solved the problem. In the following years, due to the widespread use of the adhesive, the phenomenon of complaints or claims from the mustard production plant to the color printing and packaging materials factory should be reduced year by year, and only in 1996. Unexpectedly, the adhesive produced by Shanghai Technology also solves the problem of the quality of the aluminum layer to be transferred and the peeling force is zero after the aluminized film is composited, and the vacuum-aluminized film of M-PET, M-CPP and the like can be obtained. The composite fastness is improved from the original to 1N/15mm, the best is 3~4N/15mm, and the aluminum coating is not 100% transferred. In the past ten years, it has been designated as aluminum by the majority of users. Membrane, jelly cover and special adhesive for acid and salty and sturdy composite film are also designated as plastic film composite glue by soft wine package compound manufacturer. Due to the reliable and stable quality of this rubber, it was exported to Singapore in the first half of the 1990s and became the first export product of domestic adhesives.

With the increasing application range of composite flexible packaging materials, it is not only used in the packaging of food and medicine, but also in the packaging of daily necessities, cosmetics, detergents, sanitary products, pesticides and certain chemicals, so the functional requirements More urgent. To this end, Shanghai Lieyan Chemical Co., Ltd., which was founded by Shanghai Shenhua Technology Co., Ltd., has improved and improved the quality of adhesives on the basis of the original ones since the beginning of 1997, making the functions of special adhesives for aluminum foil more comprehensive and the application fields are further expanded. Finally, in the middle of 1998, the concept of functional adhesives was first proposed, and at the same time, functional adhesive products were introduced to the market. Some of the functional adhesives are resistant to acids, alkalis, spicy, salty and oily, others are resistant to benzene, toluene, xylene, esters, hydrocarbons, wines, surfactants and less than 20%. DMF organic solvent mixture, pesticides and other erosion functions, and some are suitable for plastic / plastic, aluminum / plastic composites cooked at 128 ° C for a long time (or even 120 minutes). Among the functional series, the company has LY-50A/LY-50AH, LY-9850R/LY-9875R, LY-50VR/LY-50VRH, LY-9850/LY-9850H and other models.

China's composite flexible packaging adhesives, since the industrial production in the mid-1980s, products from scratch, production enterprises from a few to the current about three hundred, varieties from single to multiple, quality from low to high Types range from ordinary to functional to special. It can be said that there are some in the world, there are ordinary rubber, functional glue, plastic / plastic, aluminum / plastic, low temperature resistant glue, high temperature resistant glue, aromatic Group rubber, aliphatic rubber, food packaging glue, pesticides and chemicals packaging glue, solvent-based glue, solvent-free glue, non-flame retardant glue, flame retardant glue.

As mentioned above, at present, nearly 300 companies in China are producing adhesives for composite flexible packaging. The capacity of the equipment has reached 100,000 tons per year, far exceeding the market demand of 30,000 to 40,000 tons. However, due to the different technical level of each enterprise, the development and research capabilities are different, the quality of products is uneven, and the adaptability of products is also different. Therefore, some manufacturers' adhesive products are compared with imported or domestic famous brand products. There is a big gap.

In order to meet the needs of domestic composite flexible packaging production, since the first half of the 1980s, flexible packaging production equipment has been vigorously developed in various parts of the country. Soft packaging machinery production enterprises in Shanghai, Wuxi, Haining and Guangdong have mushroomed and developed rapidly. The production of color-printed flexible packaging materials has also flourished, resulting in a sharp increase in the demand for imported gravure inks and dry-type composite adhesives. In this situation, Shanghai has the production technology of polyurethane adhesive for food composite packaging materials, and there is soil for industrial production. Therefore, in 1984, the first production base of Chinese food grade polyurethane adhesive with an annual output of 60 tons was established. With this sample base, the packaging industry has seen the hope and prospects of localization of adhesives. In just two or three years, two or three places have successively built enterprises with annual output of about 500 tons, which are officially launched. The climax of localization of adhesives. In the mid-1980s, the Beijing Research Institute of Chemical Industry and the German company Henkel used the technology provided by Henkel to produce solvent-based two-component polyurethane adhesives for dry compounding in China. However, the production technology of the curing agent has not cooperated, and it has to be imported from Germany, and then used in combination with domestically produced main agents. Later, through his own research and development, he mastered the production technology of curing agent, and used the domestically produced curing agent to replace the imported product, which was used together with the main agent produced in China.

The polyurethane adhesives produced by the domestic technology in the 1980s are relatively rare on the one hand, and are mostly used in low-mid-range composite flexible packaging materials that are not required to be high. On the other hand, there are some defects in the quality, such as too high viscosity of the glue, antifreeze. Poor sex, easy to freeze in winter, use it to warm to 50 ~ 60 ° C, let it melt, then can be poured out from the packaging barrel to prepare the operating solution, and on the other hand, the film does not have much function, bonding The force is not very high and the resistance to medium is very poor.