125-liter plastic drum made of hygienic-grade resin

125-liter plastic drums should be made with hygienic-grade resin and use tin-based stabilizers. The ethylene monomers contained in the resin should be less than or equal to the specifications. Tables provide examples of plastic hard tube formulations for single-screw and twin-screw extruders, and another table shows the single-screw extrusion molding formulations for hoses. Process balance calculation is a basic skill that process designers and production managers need to master. This chapter introduces material balance and heat balance in factory process design. By studying, one can understand the basic content of material balance and heat balance in process design, master the methods of material balance and heat balance, become familiar with material balance drawing, and be able to complete material balance and heat calculation in the process design of plastic product factories.

Process balance calculation primarily focuses on material balance and accounting issues in the production of plastic products. By analyzing materials and balances throughout the entire production process or unit processes, the design scale and capacity of the factory's production equipment can be determined, as well as the yield of main and auxiliary products, the fixed consumption of raw materials, material losses in the production process, the discharge volume of "three wastes," and the consumption of utilities such as steam, electricity, water, and fuel. This provides a basis for equipment selection and infrastructure construction. In actual production, material balance and accounting for 125-liter plastic drums help reveal material waste and abnormal phenomena in the production process, thereby assisting in identifying improvement measures, enhancing product yield, reducing impurities in by-products, and decreasing the discharge of "three wastes." This supports cost reduction and energy conservation in production improvements. Therefore, process balance calculation is a crucial foundation for factory process design and production management.

Material Balance Material balance is a process that takes the factory production equipment or production process as the research system and quantitatively calculates the materials at the import and export points. Its theoretical basis is the law of conservation of mass. The material balance for 125-liter plastic drums is an important part of factory process design and production management, generally divided into operational calculations and design calculations. Operational calculations involve conducting a material balance for an established factory workshop, obtaining important production indicators such as material consumption定额 conversion rates and yields, calculating the generation of "three wastes," and providing significant guidance for controlling the production process. The results of the calculations can assess the completeness of the production process, identify weak links, and provide optimized directions for improvement. It can also judge and control the normalization of daily production, balance of production capacity, reveal material waste and abnormal phenomena in the production process, and provide reliable evidence for studying improvement measures, increasing product yield, reducing impurities in by-products, and treating "three wastes." Design calculations are conducted for new factory workshops or unit operations and equipment, serving as the foundation for the entire design work. By quantitatively calculating the various materials in the production process, it determines the proportion of materials added and the quantitative relationships between the material conversions in various production stages.