Research on lightweight design of glass packaging
[Abstract] according to the requirements of marketization and greening of glass packaging, this paper puts forward some lightweight measures for glass packaging, such as improving and strictly controlling the production process, widely using surface treatment technology, implementing lightweight design, and advocating the concept of lightweight consumption of glass packaging
key words: glass packaging; Lightweight; Measures
since the 1980s, due to the rising production cost of glass containers and the fact that glass containers are heavy and fragile, this shows the feasibility of using nanotechnology to purify automobile exhaust. Some fields have been replaced by metal containers, plastic bottles, composite flexible packaging, etc., especially in recent years, all kinds of packaging materials are competing and replacing each other in the packaging field with their unique performance advantages, The glass packaging market is facing a severe test. At present, in Europe, America and Japan, some beer packaging has been replaced by polyester bottles. In terms of pharmaceutical packaging, in addition to high-grade nutrient solution bottles and infusion bottles, the conventional packaging has been replaced by plastic bottles, hoses and blister packaging. From the perspective of market economy, glass packaging must speed up the implementation of lightweight, and reduce the number of samples that are allowed to be taken without taking the lead according to the standard. However, if the product is special, for example, the product requirements for an experiment conducted by a friend are as follows: generally, the diameter is about 1619222529mm, and the length is 8 (1) 0m. We cut 500mm to do the tensile strength experiment. With the original experimental machine, pull more than 200 pieces, and more than 100 pieces are broken within the gauge distance, that is, at 2/3 or the middle position, The hardness of ordinary sucker rod is 56 (6) 2hra; Tensile strength 793 ⑼ 65mpa Hardness of ultra-high strength sucker rod ≥ 42hrc; Tensile strength 966 ⑴ 200; Their elongation ≥ 10%, reduction of area ≥ 50%, then how to solve this kind of situation? Cost, improve performance, in order to regain and consolidate the market
at the same time, green packaging has become the trend of global packaging development. Traditional glass packaging production does not meet the requirements of green packaging because of backward production technology and equipment, poor formula, no enhanced treatment, and high energy consumption. The implementation of lightweight and strengthening the promotion of technology can make the bottle wall thinner, maintain or increase the strength, reduce the material consumption, and greatly reduce the energy consumption and cost through the improvement of equipment and process. Therefore, lightweight glass packaging is an urgent requirement of green packaging
1 lightweight overview
the lightweight of glass packaging is to reduce the weight volume ratio of glass bottles under the condition of ensuring a certain strength, and naturally improve its green and economic performance. Weight volume ratio is a measure to evaluate the mass of glass bottles and cans with the same volume. According to different uses, the weight volume ratio of lightweight bottles is generally between 0..8. The weight volume ratio of lightweight bottles is small, the bottle wall is relatively thin, and the weight is light. The average wall thickness of lightweight bottles is 2-2.5mm "2"
reducing the weight capacity ratio of glass packaging containers is mainly by reducing the wall thickness of metal materials such as steel plate, ribbed steel, round steel and just welded parts. However, it is very difficult to maintain a high compressive strength in the thin-walled state. We must start with all links of the whole process from design to production, and achieve the purpose of small wall thickness and high strength through strengthening treatment measures such as glass composition modification, reasonable structural design, correct process arrangement, effective production process index control, effective surface treatment and so on. These aspects will be discussed below
2 lightweight production process control
2.1 doing a good job in batching is the first step to realize lightweight production
formulation design of raw materials and batch preparation process, raw material composition, particle size, moisture, batch uniformity, broken glass quality and addition uniformity all have a direct impact on product quality. To do the batching work well, we must implement the stable formula, formulate and strictly implement the raw material standards, and institutionalize the batch preparation process. Domestic high-end lightweight bottle production pays special attention to this link. In terms of weighing and accuracy, the batching system adopts advanced computer-controlled electronic weighing equipment, and the dynamic accuracy should reach 1/500 to ensure the batching quality "
2.2 the melting process is not only to ensure the quality of glass packaging, but also the key link of green glass packaging.
the glass melting process can be roughly divided into five stages: silicate formation, glass formation, clarification, homogenization and cooling. The melting process adopts continuous operation, and these five stages are carried out in different parts of the furnace, so as to control the accurate melting temperature by sections. The stability of kiln operation process index is very important. Generally, the melting temperature fluctuation is not more than 10 ℃, the liquid level fluctuation is not more than 0.5mm, and the kiln pressure fluctuation is not more than 2PA, so as to prevent the fire in the kiln space, so as to prevent quality problems such as stones, color, appearance, poor strength, etc. In the production of high-grade lightweight bottles, the requirements for the fluctuation accuracy of the distribution channel temperature and the glass level are very high, and some are controlled within ± 2 ℃ and ± 0.2mm "4" respectively
of course, to ensure high-precision production process indicators, we must promote oil fired kilns, improve the kiln type, and use high-temperature, wide cross-section, large roller type horseshoe flame furnaces. A series of measures such as full heat preservation, bubbling at the bottom of the furnace, electric melting aid, furnace sill, and microcomputer control of thermal parameters were taken to make the melting rate reach 1..0 (t · m-1), and the melting quality was significantly improved by "5"
2.3 effective molding control is the guarantee to obtain the expected molding effect and uniform wall thickness.
the process of liquid glass forming glass products can be divided into two stages: molding and finalization. Molding and shaping are continuous. During the molding process, it is necessary to control the viscosity and temperature of the glass and the heat transfer to the surrounding media through the mold. Glass containers are usually controlled by three characteristic temperature values: softening temperature, annealing temperature and strain point. For different products, the key is to determine reasonable parameters through experiments. Advanced bottle making, feeding and heating systems and the use of advanced molding technology are the fundamental guarantee to obtain uniform wall thickness and light weight below the glass transition temperature
(to be continued)
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