Molding Condition | RUN series | Nylon Resin | PLASTICS

Processing conditions for RUN series resins

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
RUN35-C25 RUN35-TA E-RUNG60

Cylinder temperature
(°C)
C1 250-270
250-270
260-280

C2 260-280 260-280 270-290

C3 270-295 270-295 280-295

NH 250-290 250-290 270-290

Pressure (MPa)

Primary
pressure
50-150 50-150 50-150

Secondary
pressure 10-80 10-80 10-80

Back pressure 0-2 0-2 0-2

Injection speed
Medium to high
speed Medium to high
speed Medium to high
speed

Mold temperature (°C)
80-110 80-110 80-120

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
	RUN35-C25	RUN35-TA	E-RUNG60
<Pre-Drying> 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
<Drying Moistened 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

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