https://www.avient.com/content/compl-t-and-onforce-molding-guidelines-and-processing-conditions
Temperature, time, dew point setting, minimum and maximum moisture guidelines for Polypropylene (PP), Rigid Thermoplastic Polyurethane (ETPU), Nylon 6 (PA6), Nylon 66 (PA66), Polyketone (PK), Polyphenylene Sulfide (PPS), Polyphthalamide (PPA), Polyetherimide (PEI), Polyethersulfone (PES), and Polyetheretherketone (PEEK)
Temperature (rear feed zone, center transition zone, front metering zone, nozzle, melt, and mold) guidelines for PP, ETPU, PA6, PA66, PK, PPS, PPA, PEI, PES, and PEEK
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
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)
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
700–725
(370–385)
610–635
(320–335)
Mold Temperature 140–200
(60–90)
150–200
(65–90)
140–250
(60–120)
160–240
(70–115)
300–400
(150–200)
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)
0.02%–0.04%
250 (125)
0.02%
300 (150)
0.10%
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
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)
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
700–725
(370–385)
610–635
(320–335)
Mold Temperature 140–200
(60–90)
150–200
(65–90)
140–250
(60–120)
160–240
(70–115)
300–400
(150–200)
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)
0.02%–0.04%
250 (125)
0.02%
300 (150)
0.10%
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.
Venting Guidelines by Resin
• PC: .001"–.002" depth & .250" width
• PC/PSU: .002"–.003" depth & .250" width
• PES: .003"–.004" depth & .250" width
• PEI: .001"–.003" depth & .250" width
• PP: .001"–.002" depth & .250" width
• ABS: .0015"–.0025" depth & .250" width
• PEEK: .002"–.004" depth & .250" width
FIGURE 40 - Venting Guidelines
Vent Groove
Vent Land
Vent
FIGURE 44 - Venting guidelines
FIGURE 43 - Venting areas
20 Gravi-Tech
CHAPTER 5 | PROCESS OPTIMIZATION
Process optimization ensures a quality process
and minimizes cycle time.