Introduction

In the thermos cup industry in today’s global market, thermal insulation performance is one of the key factors to measure product quality and competitiveness. With the continuous advancement of technology, electrolytic polishing process, as an advanced surface treatment technology, is increasingly used in the production and manufacturing of thermos cups. This article will deeply explore the influence of electrolytic polishing process on the thermal insulation performance of thermos cups, aiming to provide valuable reference for manufacturers of thermos cups, international wholesale buyers and related practitioners, to help everyone better understand the value of this process, so as to make more informed decisions in product selection and promotion.

1. Overview of electrolytic polishing process

Electrolytic polishing is a process that uses the principle of electrolysis to level and polish the metal surface. In this process, the inner liner of the thermos cup is used as the anode, immersed in an electrolytic cell containing a specific electrolyte, and a direct current is passed to selectively dissolve the metal surface. The metal in the raised part is preferentially dissolved, while the concave part is relatively retained, thereby achieving a microscopic leveling effect, making the metal surface smooth and bright.

2. The influence of electrolytic polishing process on the thermal insulation performance of thermos cupsImprove surface finish

The surface finish of the thermos cup liner after electrolytic polishing can reach an extremely high level, the surface roughness value can be as low as Ra0.05 or less, and the reflectivity can reach more than 90%. This highly smooth surface can effectively reduce the liquid residue in the cup and reduce the possibility of heat loss due to liquid evaporation or contact with the cup wall, thereby indirectly improving the thermal insulation performance.The smooth inner surface also helps to reduce the loss of heat during the transfer process. In the vacuum layer of the thermos cup, heat is mainly transferred by radiation, while the smooth inner wall surface can reflect more thermal radiation, reduce heat absorption and loss, and keep the temperature in the thermos cup more stable.Enhance corrosion resistanceDuring the electrolytic polishing process, a uniform and dense oxide film will form on the surface of the thermos cup. This oxide film has good corrosion resistance and can effectively block the erosion of the cup body by external moisture, oxygen and other corrosive substances, prevent oxidation and damage to the metal surface, and thus extend the service life of the thermos cup. During the use of the thermos cup, the integrity of the liner is crucial to maintaining its thermal insulation performance. Once the liner is corroded, the thermal insulation performance will be greatly reduced.The oxide film can also improve the anti-pollution ability of the thermos cup, reduce the adhesion of dirt and bacteria on the cup wall, and keep the inside of the thermos cup clean and hygienic, which is also conducive to maintaining the thermal insulation effect of the thermos cup, because the presence of dirt and bacteria may affect the transfer and loss of heat.Optimize the microstructureElectrolytic polishing can improve the microscopic geometry of the metal surface of the thermos cup, remove surface defects such as burrs, scratches, pits, etc., and make the metal surface smoother. This optimization of microstructure can reduce the loss of heat on the metal surface, improve the heat reflection performance of the metal, and enhance the thermal insulation effect of the thermos cup.From a thermodynamic point of view, the microscopic defects on the metal surface will increase the path and resistance of heat conduction, causing heat to be more easily lost. Electrolytic polishing eliminates these microscopic defects, making the heat conduction inside the metal smoother, reducing the heat loss on the surface, thereby improving the thermal insulation performance of the thermos cup.Reduce stress concentrationDuring the electrolytic polishing process, the stress on the metal surface will be released and optimized to a certain extent, reducing the residual stress on the surface. During the use of the thermos cup, especially when the temperature of the liquid in the cup changes greatly, the metal liner will produce thermal stress. If there is stress concentration on the metal surface, it is easy to cause metal fatigue and deformation, which will affect the sealing performance and insulation effect of the thermos cup. Electrolytic polishing improves the fatigue resistance of the metal by reducing the surface stress, enhances the stability and reliability of the thermos cup, and is conducive to the long-term maintenance of the insulation performance.

3. Comparison with other polishing processesMechanical polishing

Mechanical polishing is a traditional polishing method that mainly relies on mechanical friction to remove the raised parts of the metal surface to achieve a certain degree of finish. However, mechanical polishing is prone to produce a surface metamorphic layer, resulting in a decrease in the hardness and toughness of the metal surface, and also introduces additional stress, affecting the quality and performance of the thermos cup. In contrast, electrolytic polishing does not produce a metamorphic layer, no additional stress, and can remove or reduce the original stress layer, which is more beneficial to the insulation performance of the thermos cup.Mechanical polishing has poor polishing effect on some thermos cup parts and products with complex shapes, thin walls, and small size, while electrolytic polishing is not limited by the shape and size of the workpiece, and can effectively polish various types of thermos cups, which can meet the production needs of thermos cups of different styles and models.Chemical polishingChemical polishing is to dissolve the metal surface through chemical reaction and achieve the purpose of smoothness, but this process is difficult to accurately control the degree and uniformity of polishing, and it is easy to have problems of insufficient or excessive polishing, resulting in unstable metal surface quality. Electrolytic polishing can achieve uniform polishing of the metal surface by accurately controlling parameters such as current density, electrolyte composition, and temperature, ensuring the consistency and stability of the surface quality of the thermos cup liner, thereby better ensuring the thermal insulation performance.Chemical polishing will produce a large amount of waste liquid and waste gas, causing certain pollution to the environment, while electrolytic polishing is relatively environmentally friendly, and its electrolyte can be recycled, reducing waste emissions, meeting the requirements of modern industrial environmental protection.

4. Application Status and Development Prospects of Electrolytic Polishing Process in Thermos Cup Production

Application Status At present, the electrolytic polishing process has been widely used in some high-end thermos cup manufacturers, especially in the manufacture of stainless steel thermos cups, where electrolytic polishing has become one of the key processes for improving product quality and performance. Many internationally renowned brands use electrolytic polishing technology to improve the insulation performance and market competitiveness of their thermos cups to meet consumers’ demand for high-quality thermos cups.With the continuous improvement of consumers’ requirements for the quality and function of thermos cups and the enhancement of environmental awareness, the application scope of the electrolytic polishing process is expected to expand further. More and more thermos cup manufacturers will recognize the value of the electrolytic polishing process and gradually introduce it into the production process to improve product quality and performance and meet market demand.Development ProspectsIn the future, the electrolytic polishing process will continue to innovate and develop, such as by developing new electrolyte formulas and additives to further improve polishing effects and efficiency, reduce costs, and reduce environmental impact. In addition, intelligent and automated electrolytic polishing equipment will continue to develop and improve, improve the accuracy and stability of the production process, reduce labor costs and labor intensity, and improve the overall level of thermos cup production.With the continuous progress of materials science and surface engineering technology, the combination of electrolytic polishing process and other advanced processes will also become a future development trend. For example, by combining electrolytic polishing with coating technology, laser processing technology, etc., thermos cup products with higher thermal insulation performance, longer service life and better appearance quality can be developed, injecting new vitality into the development of the thermos cup industry.

5. Conclusion

The electrolytic polishing process has a significant positive effect on the thermal insulation performance of the thermos cup. It can improve the surface finish of the thermos cup liner, enhance corrosion resistance, optimize the microstructure, reduce stress concentration, etc., thereby effectively improving the thermal insulation effect and service life of the thermos cup. Compared with the traditional polishing process, electrolytic polishing has unique advantages and has broad application prospects in the production of thermos cups. For international wholesale buyers, choosing thermos cup products produced by electrolytic polishing process can not only provide better quality goods and meet customers’ requirements for thermal insulation performance, but also enhance their own competitiveness in the market. Therefore, in-depth understanding of the impact of electrolytic polishing process on the thermal insulation performance of thermos cups is of great significance to practitioners and relevant stakeholders in the thermos cup industry.

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