Due to the small amount of residual solvent, good hygienic performance, low relative cost and high production efficiency, solvent-free compounding has been applied more and more in flexible packaging composite materials industry.
The driving force behind the development of solvent-free compounding is environmental protection. With the continuous deepening of applications, there is no need for heat energy and low cost, which has become another major driving force for solvent-free compound development. In this way, four characteristics of solvent-free compounding are formed: environmental protection, energy saving, low cost, and high efficiency.
At present, the total capacity utilization rate of non-solvent equipment in China is less than 30%, and some manufacturers' solvent-free equipment is basically suspended, resulting in a situation in which multiple equipments are introduced and the use of power supplies is less. Therefore, it is necessary to carry out in-depth analysis and research. The plastic color packaging industry has far-reaching significance. From our understanding of the situation, the current major issues are the following:
The concept of imported advanced equipment concept is due to the introduction of equipment, subjectively has the concept of advanced equipment, but in the actual production, the characteristics of high efficiency and low consumption can not be shown for a time, and some of the characteristics of solvent-based compound does not appear undoubtedly, so The formation of a rather solvent-based composite rather than solvent-free compounding, single-use non-solvent equipment manufacturers than the two devices have a good application of the situation. In fact, the advanced nature of solvent-free equipment has its own characteristics. If these characteristics cannot be achieved, there is no way to talk about its advanced nature.
The structural all-round composite concept solvent-free equipment is not all-powerful, and solvent-free adhesives are not suitable for all structures, and are more suitable for composite ordinary products. The applicable structure of the solvent-free adhesive is the following: 1. Paper-plastic, paper-aluminum structure 2. Plastic-plastic structure; 3. Aluminum-plastic structure. Two-component solvent-free adhesives have a wider range of composite structures than single-component, solvent-free adhesives. On paper composites, one-component solvent-free adhesives have characteristics.
Technical issues Due to the great differences between solvent-free compounding and solvent-based compounding technology, the composite process technology mainly manifests itself in:
1. High solvent-free glue temperature has good coating performance, and has high requirements for environment and equipment temperature or humidity;
2. Due to the lack of solvent-free composite initial tack, it is particularly important to control the tension of the retractable roll. Tension data collection, transfer, and regulation are in practice, and lack of experience in the application of various structures;
3. The compatibility of solvent-free adhesives, inks, and aluminum-plated materials is difficult to understand, so the requirements for related materials are high. For example, the appearance of complex white ink is difficult to achieve;
4. The ratio of the two-component solvent-free glue and the mixing time are strict, and there are blind spots in the control.
5. There is a relatively long curing period, long production cycle, and large capital occupation.
Because of problems in the process under the cover of a long curing time, once the waste is formed, it will cause a lot of losses, so everyone adopts a cautious approach to the use of solvent-free compound.
Equipment maintenance technology is mainly two parts: heating system and glue supply system. Since most of the heating system uses water circulation heating, the influence of water quality and other factors lead to uneven heat transfer, especially for single-component non-solvent glue. The glue supply system has the biggest problem. In the domestic manufacturers of two-component glue supply equipment, nearly half are not perfect. Mainly in the cleaning and the equipment itself, foreign countries are now vigorously solving this problem. Currently, ultrasonic cleaning is used. . Some manufacturers simply returned to the original, using a small number of real-time manual preparation to ensure the ratio and mixing time; single-supply glue system is relatively simple, and no mixing problems, it is easy to use. The accuracy, reliability, and maintainability of the glue supply system are crucial.
The selection of adhesives can be said to be done by many domestic manufacturers. Due to the differences in the reliability, adaptability of structures, coating and application processes of single- and dual-component adhesives, the differences in R&D thinking among manufacturers are different. There are differences in prices and other aspects, so it is difficult to do a good or bad order, each has its own advantages and disadvantages. At present, optimization should be made from the perspective of product structure, economy, reliability, etc. In principle, the ability of single-component and double-component adhesives should be used, and multiple adhesives coexist.
What are the operational problems? Which products? The problem of product and equipment matching is that the marketing and production technology departments should coordinate and do research and discussion in this area. Don't put anything on a solventless machine, and don't let the machine not play its due benefits.
Cost issues Solvent-free adhesives have remained high because of low demand elasticity and high import costs. The two-component price (import) is currently around 50 yuan/kg, and the single-component price (import) is around 55 yuan/kg. The original advantage of solvent-free compounding on the amount of glue is not obvious due to high prices. This problem is quite prominent. It is difficult to make high-end products. It is uneconomical to make low-end products. If the price can drop by 1/3, the cost advantage of solvent-free compounding becomes apparent.
In short, solvent-free compounding must be multi-faceted efforts, mainly to grasp the following aspects:
1. The glue supply system is perfect. Strengthen the perfection and maintenance of the glue supply equipment and even development, widen the selection of adhesives and keep the price down;
2. Improve the soft technology of processes and composite structures, improve the product-structure-process chain, and tackle key products and technologies;
3. Make full use of the advantages of high efficiency, energy-saving, and low-cost advantages of solvent-free compounding, play an environmental protection card and a price tag in marketing, and engage in equipment-product-market linkage. Consciously masterpiece strong solvent-free compound, forming the core competitiveness.
The driving force behind the development of solvent-free compounding is environmental protection. With the continuous deepening of applications, there is no need for heat energy and low cost, which has become another major driving force for solvent-free compound development. In this way, four characteristics of solvent-free compounding are formed: environmental protection, energy saving, low cost, and high efficiency.
At present, the total capacity utilization rate of non-solvent equipment in China is less than 30%, and some manufacturers' solvent-free equipment is basically suspended, resulting in a situation in which multiple equipments are introduced and the use of power supplies is less. Therefore, it is necessary to carry out in-depth analysis and research. The plastic color packaging industry has far-reaching significance. From our understanding of the situation, the current major issues are the following:
The concept of imported advanced equipment concept is due to the introduction of equipment, subjectively has the concept of advanced equipment, but in the actual production, the characteristics of high efficiency and low consumption can not be shown for a time, and some of the characteristics of solvent-based compound does not appear undoubtedly, so The formation of a rather solvent-based composite rather than solvent-free compounding, single-use non-solvent equipment manufacturers than the two devices have a good application of the situation. In fact, the advanced nature of solvent-free equipment has its own characteristics. If these characteristics cannot be achieved, there is no way to talk about its advanced nature.
The structural all-round composite concept solvent-free equipment is not all-powerful, and solvent-free adhesives are not suitable for all structures, and are more suitable for composite ordinary products. The applicable structure of the solvent-free adhesive is the following: 1. Paper-plastic, paper-aluminum structure 2. Plastic-plastic structure; 3. Aluminum-plastic structure. Two-component solvent-free adhesives have a wider range of composite structures than single-component, solvent-free adhesives. On paper composites, one-component solvent-free adhesives have characteristics.
Technical issues Due to the great differences between solvent-free compounding and solvent-based compounding technology, the composite process technology mainly manifests itself in:
1. High solvent-free glue temperature has good coating performance, and has high requirements for environment and equipment temperature or humidity;
2. Due to the lack of solvent-free composite initial tack, it is particularly important to control the tension of the retractable roll. Tension data collection, transfer, and regulation are in practice, and lack of experience in the application of various structures;
3. The compatibility of solvent-free adhesives, inks, and aluminum-plated materials is difficult to understand, so the requirements for related materials are high. For example, the appearance of complex white ink is difficult to achieve;
4. The ratio of the two-component solvent-free glue and the mixing time are strict, and there are blind spots in the control.
5. There is a relatively long curing period, long production cycle, and large capital occupation.
Because of problems in the process under the cover of a long curing time, once the waste is formed, it will cause a lot of losses, so everyone adopts a cautious approach to the use of solvent-free compound.
Equipment maintenance technology is mainly two parts: heating system and glue supply system. Since most of the heating system uses water circulation heating, the influence of water quality and other factors lead to uneven heat transfer, especially for single-component non-solvent glue. The glue supply system has the biggest problem. In the domestic manufacturers of two-component glue supply equipment, nearly half are not perfect. Mainly in the cleaning and the equipment itself, foreign countries are now vigorously solving this problem. Currently, ultrasonic cleaning is used. . Some manufacturers simply returned to the original, using a small number of real-time manual preparation to ensure the ratio and mixing time; single-supply glue system is relatively simple, and no mixing problems, it is easy to use. The accuracy, reliability, and maintainability of the glue supply system are crucial.
The selection of adhesives can be said to be done by many domestic manufacturers. Due to the differences in the reliability, adaptability of structures, coating and application processes of single- and dual-component adhesives, the differences in R&D thinking among manufacturers are different. There are differences in prices and other aspects, so it is difficult to do a good or bad order, each has its own advantages and disadvantages. At present, optimization should be made from the perspective of product structure, economy, reliability, etc. In principle, the ability of single-component and double-component adhesives should be used, and multiple adhesives coexist.
What are the operational problems? Which products? The problem of product and equipment matching is that the marketing and production technology departments should coordinate and do research and discussion in this area. Don't put anything on a solventless machine, and don't let the machine not play its due benefits.
Cost issues Solvent-free adhesives have remained high because of low demand elasticity and high import costs. The two-component price (import) is currently around 50 yuan/kg, and the single-component price (import) is around 55 yuan/kg. The original advantage of solvent-free compounding on the amount of glue is not obvious due to high prices. This problem is quite prominent. It is difficult to make high-end products. It is uneconomical to make low-end products. If the price can drop by 1/3, the cost advantage of solvent-free compounding becomes apparent.
In short, solvent-free compounding must be multi-faceted efforts, mainly to grasp the following aspects:
1. The glue supply system is perfect. Strengthen the perfection and maintenance of the glue supply equipment and even development, widen the selection of adhesives and keep the price down;
2. Improve the soft technology of processes and composite structures, improve the product-structure-process chain, and tackle key products and technologies;
3. Make full use of the advantages of high efficiency, energy-saving, and low-cost advantages of solvent-free compounding, play an environmental protection card and a price tag in marketing, and engage in equipment-product-market linkage. Consciously masterpiece strong solvent-free compound, forming the core competitiveness.
Shanghai Liuyuan Trading Co. , Ltd. , https://www.ly-weighing.com