PA (Nylon) Injection Molding Service

Common grades of PA (Nylon) used for injection molding include Nylon 6, Nylon 66, and glass-fiber reinforced nylons such as PA6 + GF15 and PA6 + GF30. Nylon 6 is known for its balance of strength, toughness, and flexibility, making it ideal for a variety of applications. Nylon 66 offers higher tensile strength and thermal stability, making it suitable for more demanding environments. Glass-fiber reinforced nylons provide enhanced stiffness and dimensional stability, which are essential for high-stress parts.

The typical wall thickness for PA (Nylon) injection molded parts ranges from 1.5mm to 3mm. Thinner walls can be achieved for specific applications, but they require careful control of the molding process to avoid defects such as warping or incomplete filling. Thicker walls provide greater strength and durability but may require longer cooling times and higher material usage.

PA (Nylon) injection molded parts typically have a shrinkage rate of 1.0% to 2.0%, depending on the specific grade and molding conditions. Glass-fiber reinforced nylons generally exhibit lower shrinkage rates due to the added stability provided by the fibers. Accurate prediction and control of shrinkage are essential for maintaining tight tolerances and achieving the desired part dimensions.

Moisture content significantly affects the injection molding process of PA (Nylon). High moisture levels can lead to hydrolysis during processing, resulting in reduced mechanical properties and surface defects such as bubbles or voids. It is crucial to thoroughly dry PA (Nylon) pellets before molding, typically at 80-100°C for 2-4 hours, depending on the material grade and initial moisture content.

The typical processing temperatures for PA (Nylon) injection molding range from 230°C to 290°C, depending on the specific grade of nylon being used. Nylon 6 is usually processed at temperatures between 230°C and 260°C, while Nylon 66 requires slightly higher temperatures, typically between 260°C and 290°C. The mold temperature should be maintained between 80°C and 100°C to ensure proper flow and minimize internal stresses.