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
Item
Grade
A1030JR
A1030GFL
A3130
Type
High-cycle nylon 6
30% Glass fiber-
reinforced nylon 6
35% Inorganic-
reinforced nylon 6
Cylinder temperature
(°C)
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
Pressure
(MPa)
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
<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.
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