-
50, 70, 90
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PP 170 65, 75, 80, 90, 100, 110 80, 90, 100, 110, 120 40 60 0.015
200 40, 100 70, 100
260 30, 40, 60, 70 45, 60, 80
Fig. 2. Produced samples related to the various MAD regions.
HRS, instead of 85 MPa for CRS which means a pressure gain of 17.64%. The pressure gains at other process tem- peratures of 170 °C and 260 °C were determined as 7.5 and 20%, respectively. When considering the low peaks instead of the average values of the injection pressure, it was determined that the pressure gains rose up to
18.75%, 42.85% and 33.33% at 170, 200 and 260 °C,
respectively. This reduction on injection pressure allows considerable saving in production costs and increases the lifetime of the mould and injection machine. Pressure gains obtained when using HRS for ABS and PP materials are presented in Table 3.
A. Demirer et al. / Materials and Design 28 (2007) 1467–1476 1471
Moulding Area Diagram forABS
290
280
270
260
250
240
230
220
20 30 40 50 60 70 80 90 100 110 120
Injection Pressure (MPa)
Fig. 3. Moulding area diagram for ABS material when using HRS and CRS.
270
260
250
240
230
220
210
200
190
180
170
160
Moulding Area Diagram for PP
HRS CRS
20 30 40 50 60 70 80 90 100 110 120 130
Injection Pressure (MPa)
Fig. 4. Moulding area diagram for PP material when using HRS and CRS.
Table 3
Injection pressure gain with the use of HRS for ABS and PP polymers
Base polymer Process temperature (°C) Injection pressure
gain with the use of HRS
(MPa) (%)
ABS 225 20 20.51
245 20 23.53
260 17.5 23.33
280 22.5