https://www.avient.com/sites/default/files/2020-10/luxury-closures-gravi-tech-design-guide-2.0-application-specific.pdf
Base Resin ABS PA PBT PC PE PEEK PP PPS
Barrel Temperatures °F (°C)
Rear Zone 400–475(200–250)
430–500
(220–260)
480–520
(250–270)
480–570
(250–300)
400–445
(200–230)
660–700
(350–475)
400–440
(200–225)
520–600
(270–300)
Center Zone 410–480(205–253)
440–510
(225–265)
483–522
(252–272)
500–580
(260–305)
410–455
(207–237)
670–710
(357–385)
410–450
(205–230)
550–610
(285–310)
Front Zone 420–490(210–257)
450–520
(230–270)
487–527
(254–274)
515–590
(267–310)
420–465
(213–243)
680–720
(363–400)
420–455
(215–235)
570–620
(300–320)
Nozzle 425–500(215–260)
460–530
(235–275)
490–530
(255–275)
530–600
(275–315)
430–475
(220–250)
700–730
(370–395)
430–460
(220–240)
610–620
(320–325)
Melt Temperature 425–515(215–270)
530–580
(276–300)
500–565
(260–300)
530–615
(275–325)
430–495
(220–260)
700–725
(370–385)
430–475
(220–250)
610–635
(320–335)
Mold Temperature 140–200(60–90)
150–200
(65–90)
140–250
(60–120)
160–240
(70–115)
80–140
(25–60)
300–400
(150–200)
80–140
(25–60)
190–300
(90–150)
Drying Parameters
190 (90)
2–4 Hours
0 .01%–0 .15%
180 (80)
4–5 Hours
0 .10%–0 .20%
275 (135)
3–4 Hours
0 .02%–0 .04%
250 (125)
3–4 Hours
0 .02%
160 (70)
2 Hours
300 (150)
3–4 Hours
0 .10%
160 (70)
2 Hours
280 (135)
2–3 Hours
0 .01%–0 .20%
Nozzle Type General Purpose Nylon or ReverseTaper General Purpose General Purpose General Purpose General Purpose General Purpose General Purpose
Injection Velocity1 2 .0–5 .0 in/sec; 50–125 mm/sec
Injection Pressure 2,000–4,000 psi; 13,000–30,000 kpa
Back Pressure 0–50 psi; 0–350 kpa
Screw Speed 25–75 RPM
Cushion 0 .125"–0 .250"; 3 .175 mm–6 .35 mm
Screw Compression Ratio2 2 .0:1–2 .5:1
Design Guide 7
Base Resin ABS PA PBT PC PE PEEK PP PPS
Barrel Temperatures °F (°C)
Rear Zone 400–475(200–250)
430–500
(220–260)
480–520
(250–270)
480–570
(250–300)
400–445
(200–230)
660–700
(350–475)
400–440
(200–225)
520–600
(270–300)
Center Zone 410–480(205–253)
440–510
(225–265)
483–522
(252–272)
500–580
(260–305)
410–455
(207–237)
670–710
(357–385)
410–450
(205–230)
550–610
(285–310)
Front Zone 420–490(210–257)
450–520
(230–270)
487–527
(254–274)
515–590
(267–310)
420–465
(213–243)
680–720
(363–400)
420–455
(215–235)
570–620
(300–320)
Nozzle 425–500(215–260)
460–530
(235–275)
490–530
(255–275)
530–600
(275–315)
430–475
(220–250)
700–730
(370–395)
430–460
(220–240)
610–620
(320–325)
Melt Temperature 425–515(215–270)
530–580
(276–300)
500–565
(260–300)
530–615
(275–325)
430–495
(220–260)
700–725
(370–385)
430–475
(220–250)
610–635
(320–335)
Mold Temperature 140–200(60–90)
150–200
(65–90)
140–250
(60–120)
160–240
(70–115)
80–140
(25–60)
300–400
(150–200)
80–140
(25–60)
190–300
(90–150)
Drying Parameters
190 (90)
2–4 Hours
0 .01%–0 .15%
180 (80)
4–5 Hours
0 .10%–0 .20%
275 (135)
3–4 Hours
0 .02%–0 .04%
250 (125)
3–4 Hours
0 .02%
160 (70)
2 Hours
300 (150)
3–4 Hours
0 .10%
160 (70)
2 Hours
280 (135)
2–3 Hours
0 .01%–0 .20%
Nozzle Type General Purpose Nylon or ReverseTaper General Purpose General Purpose General Purpose General Purpose General Purpose General Purpose
Injection Velocity1 2 .0–5 .0 in/sec; 50–125 mm/sec
Injection Pressure 2,000–4,000 psi; 13,000–30,000 kpa
Back Pressure 0–50 psi; 0–350 kpa
Screw Speed 25–75 RPM
Cushion 0 .125"–0 .250"; 3 .175 mm–6 .35 mm
Screw Compression Ratio2 2 .0:1–2 .5:1
Comments
1 .
CHAPTER 3 | PART DESIGN GUIDELINES
Wall Thickness (mm)
C
o
o
li
n
g
T
im
e
(
S
e
c
)
40
35
30
25
20
15
10
5
0
0 1 2 3 4
ABS
PC
Nylon 6/6
Figure 2 - Designing for Wall Thickness Changes
Bad
Better
Recommended
Recommended
Poor
High Stress
Ideal
Figure 3 - Internal and External
Radius Guidelines
.5W Min
Inside Rad + W
Poor
High Volume
FIGURE 1 - Wall thickness vs. cooling
time of various plastics
FIGURE 2 - Designing for
wall thickness changes
FIGURE 3 - Internal and external
radius guidelines
Design Guide 9
RIB DESIGN GUIDELINES
The minimum distance ribs should be spaced is
three times the nominal wall thickness (3W) .
The round at the bottom of the boss should
Figure 4 - Drafting Guidelines for
Nominal Wall Thickness
Cross section
showing draft
Figure 5 - Rib design guidelines
1/4˚—–1˚
2.5W
W
3W Min.
.01" R Min. or .25W
.75W for a low shrink material
.50W for a high shrink material
Figure 6 - Wall thickness changes due
to rib placement
16.00
14.00
12.00
10.00
8.00
6.00
4.00
2.00
5.00 10.00 15.00 20.00 25.00 30.00 35.00
Rib-height (mm)
M
a
x
D
is
p
la
c
e
m
e
n
t
M
a
g
n
it
u
d
e
(
m
m
)
0
FIGURE 4 - Drafing guidelines for
nominal wall thickness
FIGURE 5 - Rib design guidelines
FIGURE 7 - Wall thickness changes
due to rib placement
FIGURE 6 - Rib height vs. stiffness
10 Gravi-Tech
FIGURE 8 - Side Wall Boss Design Guidelines
Sink
Not Recommended Preferred Design
A
= Diameter
= A
= Primary Wall
= A
= 2A
FIGURE 9 - Guidelines Design Guidelines
4W
W
2W
.75W For a Low Shrink Material
.50W For a High Shrink Material
FIGURE 9 - Side wall boss design guidelines
FIGURE 10 - Gusset design guidelines
FIGURE 11 - Structural hole
design guidelines
be 10% of wall thickness.
https://www.avient.com/resources/safety-data-sheets?page=4702
VERSOLLAN UV BLACK C
PROCESS MAGENTA C
https://www.avient.com/resources/safety-data-sheets?page=6904
BLUE 280 C (PP)
BLUE 280 C (RPP)
https://www.avient.com/resources/safety-data-sheets?page=669
PURPLE C
PROCESS BLUE C
https://www.avient.com/resources/safety-data-sheets?page=5908
TPO KEY GRIP GREY-C
ASA GREY-C
https://www.avient.com/resources/safety-data-sheets?page=6415
TPE BLACK C KNOBS
PC COMPOSITE BLACK C
https://www.avient.com/resources/safety-data-sheets?page=2867
293CPFX EPIC PANTONE(R) 293 C SIMULATION
SX634A CLEAR HV CRISS-C
https://www.avient.com/resources/safety-data-sheets?page=1232
REFLEX BLUE C V3
REFLEX BLUE C V2
https://www.avient.com/resources/safety-data-sheets?page=5255
RED DS 74-1 C
RED TPE DS 74-1 C
https://www.avient.com/resources/safety-data-sheets?page=1753
PX-C-149 Standard Flesh
PX-C-150 Lt.