Nylon Resin

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

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