With the increasing awareness of environmental protection and the demand for resource recycling, the recycling and reuse of aluminum press caps for spray pump heads has become an industry trend. However, during the recycling process, changes in material composition and impurities can easily affect product quality, and a series of technical means are needed to ensure stable quality.
The first step to ensure quality is to accurately sort the recycled aluminum press caps. Using technologies such as eddy current sorting and X-ray fluorescence spectroscopy (XRF), aluminum press caps are classified according to their alloy composition, surface coating and degree of contamination. For example, aluminum products with different alloy compositions require different process parameters during recycling and smelting. If mixed, the composition will be unbalanced. In the pretreatment stage, ultrasonic cleaning, high-pressure spraying and other methods are used to remove impurities such as cosmetics and oil stains remaining on the surface to prevent impurities from affecting the purity of aluminum liquid in subsequent processing, reduce the probability of defects such as pores and slag inclusions, and lay a quality foundation for subsequent processes.
The smelting link is the key to determining the quality of recycled aluminum. By accurately controlling the smelting temperature, time and gas protection, aluminum liquid oxidation and impurity residues can be effectively reduced. Generally, the melting temperature is controlled at 700-750℃, which can ensure that the aluminum is fully melted and avoid burning of alloy elements due to excessive temperature. The use of inert gas such as argon to protect the melting process can prevent the aluminum liquid from contacting with oxygen to form alumina inclusions. At the same time, an appropriate amount of refining agent, such as hexachloroethane, non-toxic refining agent, etc., is added to adsorb the suspended impurities in the aluminum liquid and make them float to the surface for removal, further purify the aluminum liquid, ensure the purity of the recycled aluminum, and thus ensure the strength and corrosion resistance of the aluminum press cap.
The composition of recycled aluminum is often different from that of the original aluminum press cap, and composition adjustment is required. The composition of the aluminum liquid is monitored in real time using spectral analysis technology, and alloy elements such as magnesium, manganese, copper, etc. are added according to the target alloy composition requirements to accurately adjust the composition ratio. For example, to ensure the strength and toughness of the press cap, the magnesium content needs to be controlled within a specific range. At the same time, during the smelting process, sampling and testing are carried out many times, and metallographic analysis, mechanical properties testing and other means are used to detect the grain structure, tensile strength, hardness and other indicators of recycled aluminum to ensure that various properties meet the quality standards for the production of aluminum press caps. Once problems are found, the process parameters are adjusted in time.
In the process of recycled aluminum forming press caps, process control is crucial. High-precision die-casting and injection molding equipment are used to strictly control parameters such as mold temperature, injection pressure and holding time. Excessive mold temperature will cause pores and shrinkage marks on the surface of the press cap, and too low temperature will affect the molding accuracy and surface finish. By optimizing the process parameters, the dimensional accuracy and wall thickness uniformity of the press cap are ensured to meet the design requirements, while the compatibility of the press cap and the spray pump head is ensured, avoiding problems such as poor sealing and poor pressing caused by dimensional deviation, and ensuring the stability of product performance.
The surface treatment of recycled aluminum press caps is not only about beauty, but also affects its corrosion resistance and service life. When using surface treatment processes such as anodizing, electrophoretic coating, and vacuum coating, strictly control process parameters such as anodizing voltage, time, and electrolyte concentration to ensure that a uniform and dense oxide film or coating is formed on the surface. In addition, a complete quality traceability system is established to give each batch of press caps a unique identification during the production process, and record the entire process information from recycled raw materials to finished products, including sorting batches, smelting parameters, and molding processes. Once a quality problem occurs, the root cause can be quickly traced, and improvement measures can be taken in time to enhance quality control capabilities.
In the recycling and reuse of aluminum press caps for spray pump heads, a series of technical means such as efficient sorting pretreatment, optimized smelting and molding processes, precise component blending, strict surface treatment, and the establishment of a quality traceability system can effectively ensure product quality stability. This not only promotes the recycling of aluminum resources, but also provides solid support for the green and sustainable development of the industry.
