In recent years, the pearl aquaculture industry in China has experienced remarkable growth. The annual production of seawater pearls increased from just 2 tons in 1988 to between 15 and 20 tons today. Meanwhile, the development of freshwater pearls has been even more impressive. In 1992, the output was 300 tons, and it has now surged to 800–1,000 tons. This rapid expansion highlights the increasing demand for pearls in both domestic and international markets.
The process of pearl optimization involves several key steps, starting with pre-treatment. This stage includes sorting, drilling, puffing, and dehydration. Due to the delicate structure of the pearl's outer layer, traditional bleaching methods often fail to penetrate deeply. Instead, a controlled swelling process is used to gently loosen the pearl structure without causing damage. This step is crucial for preparing the pearl for further treatment.
In the new optimization process, pre-treatment plays an equally important role as bleaching. Unlike older techniques, this method focuses on protecting the nacre layer and minimizing luster loss. It involves cleaning, bead layer protection, sorting, and drilling. A unique feature of this process is the non-perforated bead layer treatment, which prevents direct contact between the pearls and the bleaching solution. This helps avoid oxidation and enhances the natural luster of the pearls. The use of benzene and ammonia-based solutions has been replaced with more advanced, safer alternatives, although specific details remain confidential.
The reagents used must be colorless, transparent, heat- and acid-resistant, chemically stable, and safe for human use. They also need to withstand ultrasonic cleaning and polishing. These qualities ensure that the pearls remain intact and maintain their quality throughout the process.
The protective bead layer treatment offers several advantages: no perforation, a significant increase in light brightness, and minimal surface adhesion during bleaching. These benefits make the process more efficient and less damaging to the pearls.
Next comes the bleaching stage. Before bleaching, decontamination is essential. Cultured pearls often contain organic impurities such as free cells, mucus, and small fragments of necrotic tissue. These contaminants can cause dark spots, significantly reducing the pearl’s luster. Decontamination and bleaching help restore the original shine, making the pearls more valuable.
The optimized formula for bleaching includes solvents, penetrants, stabilizers, and surfactants. The right combination of these ingredients determines the success of the bleaching process. Improper application can lead to damage or deterioration of the pearls. Surfactants, particularly non-ionic types like Span and Tween, are especially effective due to their ability to enhance penetration and cleaning.
Stabilizers play a key role in maintaining the pH balance of the bleaching solution. Since pearls are primarily composed of calcium carbonate, an acidic environment can cause corrosion. Although the pH is adjusted during the process, it tends to decrease over time, making stabilization critical for consistent results.
In the new process, pre-treated pearls do not develop large bubbles during bleaching. The solution enters through the bead hole rather than directly contacting the surface, reducing the risk of damage. This approach minimizes the chance of "zou" (a term referring to surface imperfections) and improves the overall quality of the pearls.
Bleaching is conducted at low temperatures, which may extend the process but ensures thorough and gentle treatment. This leads to better results with minimal damage to the pearls.
After bleaching, liquid removal is essential. If not properly washed, the remaining chemicals can cause discoloration, whitening, or yellowing over time. This step is crucial for maintaining the long-term quality of the pearls.
Post-processing includes additional treatments such as whitening, coloring, and polishing. Polishing is particularly important for enhancing the final appearance and luster of the pearls.
In conclusion, modern pearl processing technology maximizes the quality and value of pearls. Its key innovations include pre-treatment without bead layer perforation, the use of low-temperature bleaching systems, and the selection of advanced polishing materials. These advancements have significantly improved the efficiency and safety of pearl processing, ensuring higher-quality products for consumers.
Single Use Trocar Site Closure Device
A fascial closure device is a laparoscopic instrument used to close the fascia, the layer of tissue that covers and separates abdominal organs and muscles. The device is used during laparoscopic surgery to create a secure closure of the fascia after the surgical procedure is complete.
The fascial closure device consists of a needle and suture material attached to a handle. A needle is used to puncture the fascia, then suture material is passed through the puncture site and tied tightly to close the fascia. The device's handle is used to control the movement of the needle and suture material, allowing precise placement and closure of the fascia.
The use of fascial closure devices during laparoscopic surgery can help reduce the risk of postoperative complications such as hernias, wound infections, and intestinal obstruction. It also closes the fascia more quickly and efficiently, reducing the overall time required for the procedure.
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Changzhou Weipu Medical Devices Co., Ltd. , https://www.cnweipumedical.com
