Solution for silver lines appearing in the product during injection molding

Silver wire, also known as silver grain, silver wire, is mainly caused by the hygroscopic properties of the material, which is a common defect in injection molding products. It appears as a silver white silk streak on the surface of the product along the flow direction. The following are the reasons for the silver line mark defects of the Plastic Products in the injection molding process and the corresponding solutions:

l cause

Air or moisture volatilization in plastic: plastic will absorb the water in the air when storage. If it is not fully dried before injection processing, these residual water will be converted into water vapor during the injection process, thus creating splash marks on the surface of the product.

Different otic plastic mixed decomposition: different kinds of plastic in the injection process may be mixed and decomposition and burning phenomenon, leading to the emergence of silver lines.

Poor exhaust of the mold: unreasonable mold design or poor exhaust, will lead to the plastic filling in the mold gas can not be discharged, thus forming silver lines on the surface of the product.

Improper setting of processing parameters: if the material tube temperature is set too high, the injection speed is too fast, and the injection pressure is too high, the silver lines may lead to the plastic decomposition during the injection process.

Plastic humidity or contains impurities: plastic itself humidity or contains too much recycled material, harmful debris and other impurities, but also easy to produce silver lines.

The flow stagnation time of simple materials is too long, different kinds of materials are easy to produce silver line, such as polystyrene and ABS resin, AS resin, polypropylene and polystyrene and so on should not be mixed.

l Solution

Raw material treatment: ensure that raw materials are fully dried before storage and processing, and use hot air drying hopper and other equipment to remove moisture from raw materials. Raw materials containing impurities should be screened and cleaned.

Mold design optimization: optimize the mold design, increase the exhaust tank or improve the exhaust system, to ensure that the plastic can be discharged smoothly during the filling process.

Adjust the processing parameters: according to the raw material characteristics and product requirements, adjust the material pipe temperature, injection speed, injection pressure and other parameters, to avoid the decomposition of plastic during the injection process.

Use high quality raw materials: select raw material suppliers with stable quality and avoid using raw materials with high humidity or impurities.

Maintenance of the Injection Molding Machine : regularly check the screw, material cylinder and other parts of the Injection molding machine to ensure that they are in good condition and avoid silver lines caused by component wear or failure.

Timely drying: the drying temperature should be 10~15℃ lower than the thermal deformation temperature of the resin. For the more demanding PMMA tree wax series, it needs to be dried at about 75t for 4~6h. Especially in the use of automatic drying hopper, it is necessary to choose a reasonable capacity according to the molding cycle, molding quantity and drying time, and the drying material should be started a few hours before the start of injection.

Finally, allow me to introduce our factory, a leading manufacturer specializing in injection molding machine, Injection molds, and Injection Molding Auxiliary Equipment.

Our Injection Molding Machine is designed for precision and efficiency, ensuring high-quality outputs in every production cycle.Coupled with our Auxiliary machine , Injection Machine Electric Motor, Injection Machine Nozzle . They enhance the overall performance of the molding process, our solutions are tailored to boost productivity and reduce downtime. Additionally, our Injection Mold is precision-crafted to ensure consistency and accuracy in the finished products.

We also offer Recycled Plastic Raw Material such as PET, PP, PVC, PS, PA, PE ,ABS pellets. To ensure precise and consistent results, we offer a wide selection of Mold Temperature Control Machines. These machines play a crucial role in regulating mold temperatures, ensuring optimal conditions for the molding process and enhancing the quality of finished products.

Our High Precision Injection Mold is precision-crafted to exacting specifications, ensuring that every detail of the finished product meets the highest standards of quality and accuracy.We offer a wide range of special injection molding machines such as: Water Pail Injection Molding Machine, Fruit Box Injection Molding Machine, Mobile Phone Case Injection Molding Machine,Garbage Can Injection Molding Machine, Injection Molding Machine for Needles, Chair Injection Molding Machine and Basket Injection Molding Machine cater to the needs of our customs, providing them with efficient and cost-effective solutions for mass production.

Injection molding machine plastic products cover a number of industry areas: Automobile manufacturing, electronic and electrical industry, packaging industry, daily necessities manufacturing, medical device manufacturing, construction industry, furniture manufacturing, sports and outdoor equipment, aerospace, textile and clothing industry, wire and cable industry, agriculture and horticulture, environmental protection and sustainable development, with the continuous progress of technology and the expansion of the market, the application field of injection molding machine will continue to expand.

Whether you're looking to upgrade your existing equipment or establish a new production line, we have the perfect solution for you. Contact us today to learn more.