At present, the state pays more and more attention to the safety supervision of food and drug. At the same time, higher requirements are put forward for the safety performance and environmental protection of packaging materials. Therefore, for flexible plastic packaging, dry composite process will be eliminated due to its inherent defects. Looking for a healthy, safe and environment-friendly composite process has become an important topic in the flexible plastic packaging industry. In the 1970s, Germany invented a new green composite technology solvent-free composite. In the 1990s, this technology was introduced into China. Compared with the ordinary dry process, the mask bag manufacturer has the following advantages: solvent-free composite.
1、 Health
At present, the solvent residue in soft plastic packaging is the most important problem affecting the health of consumers and operators. Some technical personnel in the industry have also made a lot of technical improvements in terms of equipment and raw materials, but they can only reduce the residual amount of solvent, which can not be completely avoided
No residual solvent was produced. Solvent free process completely avoids the use of organic solvents in the production process, which fundamentally solves the problem of solvent residue. So solvent free composite is a healthy composite process.
2、 Security
Fire and explosion accidents often occur in domestic and foreign flexible packaging enterprises, mainly due to improper operation or high concentration of organic solvents in the air. If the use of solvent-free compound, the use of organic solvents can be completely avoided
It is a potential safety hazard.
3、 Environmental protection
The solventless composite adhesive is a solid substance without any organic solvent. Therefore, it has no effect on the health of production workers. At the same time, it also realizes zero emission of organic solvents, avoids air pollution, and has obvious environmental protection advantages.
4、 Cost savings
1. The coating weight of solvent-free composite is usually 1.3-1.8g/m2, while that of dry composite is 2.5-4g/m2. Therefore, compared with dry composite, the adhesive consumption can be saved by about 50%. Although the price of solvent-free glue is higher, the overall cost of raw materials is still acceptable
The decrease was about 20%.
2. As the insoluble composite process does not need drying process, the energy consumption cost is effectively reduced. After calculation, the energy consumption cost of solvent-free equipment is 1 / 15 of the energy consumption cost of dry composite equipment.
3. From the perspective of production efficiency, the efficiency of solvent-free equipment is 1.5-2 times of that of ordinary dry composite, which effectively reduces the production cost.
Although solventless composite has many advantages, it is not widely used in China. The main factors that restrict the development of facial mask manufacturers are the following:
1. High requirements for equipment
Since the solventless glue has no initial adhesion, there are high requirements for the control accuracy of the equipment tension control system and coating unit. Now only the solvent-free equipment produced by Italy's nordmec company is relatively mature, but the price is high,
It is usually more than 3 million yuan, while the price of domestic drying equipment is between 1 million yuan and 2 million yuan.
2. Precise control of production process is required
The operation temperature, tension matching, coating amount and other process settings need to be accurately controlled, and different production processes should be set according to different product structure, so the process adaptation range is narrow and the operation is difficult.
3. Higher requirements for operators
A qualified solvent-free captain needs to have a good sense of responsibility and excellent operation skills, and often the operation experience is summed up from failure. Therefore, it costs a lot to train a qualified captain.
4. The application structure is not extensive
The early solvent-free composite can only be applied to simple plastic composite. With the continuous improvement of adhesive and the continuous maturity of operation technology, aluminum coating and some multilayer structure products can be produced normally. But for some of the wood with high rigidity
Material, composite appearance is not very ideal. It needs further improvement.
5. mask bag manufacturers have a lagging judgement on product quality.
Because there is no initial adhesion of solvent-free composite, the quality can not be determined immediately after production, and the product quality can only be confirmed after aging for 6 hours, so there is a certain quality risk.
Although there are still many problems to be solved, its advantages in health, safety, environmental protection and cost are beyond doubt. With the continuous progress of society and people's increasing attention to health and environmental protection issues, solvent-free composite will be welcomed
To the spring of development. http://www.ycritai.cn/
Dongguan Beite packaging materials Co., Ltd
Aluminum foil packaging bags, mask bags, self-supporting zipper bags, eight side sealing bags, red wine bags, dog food bags, beverage bags, bags in boxes, wrapped films, perforated fruit bags.