Nylon Resin


Molding Condition

Among many plastics, Nylon resins are rather easier in molding.
UNITIKA nylon 6 resins have a variety of grades for injection and extrusion molding.
UNITIKA resins provide excellent molding processability, regardless of the size or shape of the products. Typical molding conditions and the relevant data are summarized in the following Table.

Table 1. Examples of injection molding condition for UNITIKA nylon 6 resins

A1030JR A1030GFL A3130
High-cycle nylon 6 30% Glass fiber-
reinforced nylon 6
35% Inorganic-
reinforced nylon 6
Cylinder temperature
C1 220-230 230-240 230-240
C2 230-250 250-260 250-260
C3 230-250 255-265 255-265
NH 230-250 255-265 250-260
Primary pressure 50-70 80-90 70-90
Secondary pressure 40-60 60-80 50-70
Back pressure 3-5 3-5 3-5
Injection speed
Low to high speed Low to high speed Low to high speed
Mold temperature (°C)
70-80 80-100 80-100

* Molding machine: Toshiba Machine IS-100E
* Molded piece: ASTM D-638 dumbbell piece, type I, (3.2 mm)x2 pieces

Molding Shrinkage

The values of molding shrinkage vary generally according to the molding conditions including the kind of grades, thickness of molding pieces, resin temperature, injection pressure, mold temperature, and others. These factors should be considered in designing the molds. The relationship between the molding shrinkage and the thickness of molding pieces is shown in Figure 23.

Figure 23. Relationship between molding shrinkage and thickness

Molding Shrinkage

Water-Absorbing Speed of Pellets

The water-absorbing speed of A1030JR pellet when stored under an environment of 20 to 25°C and 60 to 65% RH is shown in Figure 24.

Figure 24. Water-absorbing speed of pellet

Water-Absorbing Speed of Pellets