How to avoid black spots on precision plastic injection molded parts?

In the field of precision plastic injection molding, black spots on parts are a common and difficult problem, which can seriously affect the appearance and quality of products. To effectively avoid this problem, it is necessary to focus on multiple key aspects, which are detailed below.
Create a clean molding environment
A clean molding environment is a fundamental prerequisite for avoiding the formation of black spots. During the injection molding production process, dust, impurities, and other environmental factors can easily mix into the plastic raw materials, leading to the formation of black spots during part molding. Therefore, maintaining the cleanliness and hygiene of the molding workshop is crucial. Regular comprehensive cleaning of the workshop is necessary, and air purification equipment is used to control the dust content in the air, creating a clean and dust-free space for injection molding production.
Equipped with a clean feeding system
The cleanliness of the feeding system directly affects the purity of plastic raw materials. Dongguan Yize Mold is well aware of this, and its precision plastic injection molding is equipped with advanced plastic material automatic drying and feeding systems. This system can accurately control the dryness of raw materials, avoiding the formation of black spots during the injection molding process due to moisture absorption of raw materials; At the same time, the automatic feeding method reduces the pollution risk caused by manual operation, ensuring that the raw materials are not disturbed by external impurities during transportation, and guaranteeing the cleanliness of the raw materials from the source.
Use clean injection molding machines and screws
The cleanliness of injection molding machines and their screws plays a crucial role in the quality of parts. If there are impurities, carbides, etc. left over from the previous production inside or on the screw of the injection molding machine, these substances will mix into the new plastic raw materials in the new production process, causing black spots on the parts. Dongguan Yize Mold Co., Ltd. attaches great importance to this point. Its newly imported injection molding machines, ranging from 30 tons to 280 tons, not only have excellent performance and can meet the needs of high-temperature plastic injection molding, such as processing fiberglass reinforced plastic materials (PA+50% GF, PPS+40% GF), PEEK, etc., but also thoroughly clean the injection molding machines and screws before each production to ensure the cleanliness of the production equipment and provide strong guarantees for the production of high-quality parts. In addition, the company also retains 100 tons of Fanuc injection molding machines, which are specifically used for white and transparent plastic injection molding processing, such as ABS, PC, PMMA (acrylic), etc., further meeting customers' needs for manufacturing clean and transparent plastic parts.
Relying on high-quality mold foundation
Good and high-quality molds are the foundation for producing high-quality injection molded products. Yize Mold has over ten years of experience in exporting precision injection molds and has always focused its main efforts on precision mold manufacturing. With exquisite craftsmanship and strict quality control, the molds manufactured by the company have high precision and stable quality, which can effectively reduce defects in the injection molding process and lower the probability of black spots. At the same time, the company gradually provides customers with more and better precision plastic injection molding services, and every step of development is closely focused on meeting customer needs and solving problems for customers, continuously improving its service level and market competitiveness.