RUN series
1. Molding Condition
The good appearance and warping resistance, characteristic features of RUN series resins, can only be given by processing under suitable molding conditions. Among many factors, please note that the cylinder and mold temperatures are the most important factors.
Typical conditions are summarized in the following table.
Examples of Injection Molding Conditions for RUN Series Resins
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Cylinder
temperature (°C) |
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250-270 |
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Pressure
(MPa) |
Primary pressure |
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pressure |
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Injection speed |
speed |
speed |
speed |
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Mold temperature
(°C) |
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Considerations in deciding temperature conditions
Cylinder Temperature:
Suitable temperature depends on the flowability of the resins but is 295°C at the maximum. Like other general nylon resins, the resins decompose at a temperature of over 300°C.
Mold Temperature:
Special attention should be directed to the mold temperature when the appearance of products is primary concern, as it significantly affects the appearance of products. RUN series resins provide products excellent in appearance when the mold temperature is 80°C or more, but if the temperature is raised excessively, the molding cycle may be elongated and the warping of the products amplified. Use the temperature range shown in the table for your reference, as the most favorable moldability and product appearance are obtained in the range.
2. Drying condition
As delivered in a sealed drying bag, RUN series resins do not demand drying immediately after opening the package.
However, it is recommended to perform pre-drying for consistent and stable molding operation by the steps described below.
In addition, make sure to conduct pre-drying of the resins that are left for 6 hour or more after opening the package.
Please note that the resins except RUN35-C25 may discolor (yellowing) like other nylon resins when the drying temperature is high or the drying period is longer. Vacuum drying is recommended for preventing yellowing.
Resins that have absorbed moisture may be dried according to the conditions shown in the following table. However, please note that the resins except RUN35-C25 have a possibility of yellowing.
Examples of the Drying Condition for RUN Series Resins
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Hot air drying Vacuum drying |
1-2 hours at 120-140°C 5 hours or more at 100-120°C |
6 hours or more at 90°C 5 hours or more at 100°C |
6 hours or more at 90°C 5 hours or more at 100°C |
Resins> Hot air drying Vacuum drying |
5 hours or more at 120-140°C 12 hours or more at 100-120°C |
Undesirable 12 hours or more at 100°C |
Undesirable 12 hours or more at 100°C |