DRYING CONDITIONS Most Nylon manufacturers ship NYLON 66 resins at or below 0.25% moisture content. When drying is required due to hopper residence times in excess of one hour, exposure to air, or when adding regrind, desiccant air dehumidifying hopper dryers are necessary. Hot air dryers without desiccant should not be used as they can actually increase the moisture content of the resin. The temperature of the drying air should not exceed 165°F for natural colored resins and 180°F drying temperature allowable for black materials in order to prevent excessive oxidation and discoloration. The required drying time is dependent on the length of time the resin is exposed to the atmosphere and the level of humidity. The following drying times are commonly recommended. EXPOSURE TO AIR (hours)DRYING TIME AT 165° F (hours)0-424-24424-12024>12048 Optimum moisture levels range from 0.08% to 0.18%. Moisture levels less than 0.06% can result in reduced flow characteristics and/or poor surface aesthetics. Moisture should be measured via the Karl-Fischer Titrator method. Weight Loss or Desiccating weight loss units can be acceptable for the manufacturing environment, but they should be correlated via the Karl-Fischer Titrator method. The dew point of circulating air should be less than -20°F (-28°C). Air throughput minimum of 1 CFM/pound of resin/hour. INJECTION MOLDING CONDITIONS In order to obtain high quality molded parts, the processing setup must be aligned with the specific material, molding machine, throughput rate, and part-runner configurations. Screw designs and heat transfer characteristics vary between machines of different manufacturers, making it difficult to specify cylinder temperature profiles that can be universally applied to all injection units without some modifications. The following molding conditions are recommended starting points. PARAMETERUNFILLEDIMPACT MODIFIEDREINFORCEDRear Zone (F)500-530500-530510-550Middle Zone (F)510-540510-550520-560Front Zone (F)520-550520-560530-580Nozzle and Manifold (F)515-550515-560520-580Melt Temperature (F)515-550515-560520-580Mold Temperature (F)120-220120-220120-220Injection Pressure (psi)*1,000-2,0001,000-2,0001,000-2,000Pack and Hold Pressure (psi)*500-1,400500-1,400500-1,500Back Pressure (psi)*20-10020-10020-100Screw Speed (RPM)60-12060-12060-120Shot to Cylinder Size (%)40-8040-8040-80 *Pressures given are in the hydraulic circuit

Optimum moisture levels range from 0.08% to 0.18%. Moisture levels less than 0.06% can result in reduced flow characteristics and/or poor surface aesthetics. Moisture should be measured via the Karl-Fischer Titrator method. Weight Loss or Desiccating weight loss units can be acceptable for the manufacturing environment, but they should be correlated via the Karl-Fischer Titrator method. The dew point of circulating air should be less than -20°F (-28°C). Air throughput minimum of 1 CFM/pound of resin/hour.

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Nylon 66 is a very widely used plastic material and our Nylon 66 General Processing Guidelines can help you better understand the subtleties of processing nylon 66 to produce high quality parts.

In order to obtain high quality molded parts, the processing setup must be aligned with the specific material, molding machine, throughput rate, and part-runner configurations. Screw designs and heat transfer characteristics vary between machines of different manufacturers, making it difficult to specify cylinder temperature profiles that can be universally applied to all injection units without some modifications. The following molding conditions are recommended starting points.

Most Nylon manufacturers ship NYLON 66 resins at or below 0.25% moisture content. When drying is required due to hopper residence times in excess of one hour, exposure to air, or when adding regrind, desiccant air dehumidifying hopper dryers are necessary. Hot air dryers without desiccant should not be used as they can actually increase the moisture content of the resin. The temperature of the drying air should not exceed 165°F for natural colored resins and 180°F drying temperature allowable for black materials in order to prevent excessive oxidation and discoloration. The required drying time is dependent on the length of time the resin is exposed to the atmosphere and the level of humidity. The following drying times are commonly recommended.