https://www.avient.com/products/engineered-polymer-formulations/sustainable-formulations/maxxam-rec-recycled-polyolefin-formulations
They can be filled and reinforced to satisfy required performance characteristics and can be blended with glass, minerals, impact modifiers, colorants and stabilizer systems.
https://www.avient.com/news/new-black-colorants-polyone-support-circular-economy-turn-former-waste-recyclable-packaging
Detection and sorting of carbon black-filled plastic waste in material recovery facilities is a vexing issue for the packaging and recycling industries, because the equipment relies on the reflectance of near infrared (NIR) wavelengths.
Light-weighting solutions that replace heavier traditional materials like metal, glass and wood, which can improve fuel efficiency in all modes of transportation
https://www.avient.com/sites/default/files/2020-09/stat-tech-tri-fold-processing-guide.pdf
Venting
• Place vents at the end of fill and anywhere potential knit/weld lines will occur
Cut vent depths to:
- PC Compounds: 0.001"–0.002" depth and 0.250" width
- PC/PSU Compounds: 0.002"–0.003" depth and 0.250" width
- PES Compounds: 0.003"–0.004" depth and 0.250" width
- PEI Compounds: 0.001"–0.003" depth and 0.250" width
- PP Compounds: 0.001"–0.002" depth and 0.250" width
- ABS Compounds: 0.0015"–0.0025" depth and 0.250" width
- PEEK Compounds: 0.002"–0.004" depth and 0.250" width
- Nylon Compounds: 0.002" min. depth and 0.250" width
• Increase vent depth to 0.040" (1.0mm) at 0.250" (4.0mm) away from the cavity
and vent to atmosphere.
PROBLEM CAUSE SOLUTION
Incomplete Fill Melt and/or mold
temperature too cold
Mold design
Shot Size
• Increase nozzle and barrel temperatures
• Increase mold temperature
• Increase injection speed
• Increase pack and hold pressure
• Increase nozzle tip diameter
• Check thermocouples and heater bands
• Enlarge or widen vents and increase number of vents
• Check that vents are unplugged
• Check that gates are unplugged
• Enlarge gates and/or runners
• Perform short shots to determine fill pattern and verify
proper vent location
• Increase wall thickness to move gas trap to parting line
• Increase shot size
• Increase cushion
Brittleness Melt temperature too low
Degraded/Overheated material
Gate location and/or size
• Increase melt temperature
• Increase injection speed
• Measure melt temperature with pyrometer
• Decrease melt temperature
• Decrease back pressure
• Use smaller barrel/excessive residence time
• Relocate gate to nonstress area
• Increase gate size to allow higher flow speed
and lower molded-in stress
Fibers on Surface
(Splay)
Melt temperature too low
Insufficient packing
• Increase melt temperature
• Increase mold temperature
• Increase injection speed
• Increase pack and hold pressure, and time
• Increase shot size
• Increase gate size
Sink Marks Part geometry too thick
Melt temperature too hot
Insufficient material volume
• Reduce wall thickness
• Reduce rib thickness
• Decrease nozzle and barrel temperatures
• Decrease mold temperature
• Increase shot size
• Increase injection rate
• Increase packing pressure
• Increase gate size
Flash Injection pressure too high
Excess material volume
Melt and/or mold
temperature too hot
• Decrease injection pressure
• Increase clamp pressure
• Decrease injection speed
• Increase transfer position
• Decrease pack pressure
• Decrease shot size
• Decrease injection speed
• Decrease nozzle and barrel temperatures
• Decrease mold temperature
• Decrease screw speed
TROUBLESHOOTING RECOMMENDATIONS
PROBLEM CAUSE SOLUTION
Excessive Shrink Too much orientation • Increase packing time and pressure
• Increase hold pressure
• Decrease melt temperature
• Decrease mold temperature
• Decrease injection speed
• Decrease screw rpm
• Increase venting
• Increase cooling time
Not Enough Shrink Too little orientation • Decrease packing pressure and time
• Decrease hold pressure
• Increase melt temperature
• Increase mold temperature
• Increase injection speed
• Increase screw rpm
• Decrease cooling time
Burning Melt and/or mold
temperature too hot
Mold design
Moisture
• Decrease nozzle and barrel temperatures
• Decrease mold temperature
• Decrease injection speed
• Clean, widen and increase number of vents
• Increase gate size or number of gates
• Verify material is dried at proper conditions
Nozzle Drool Nozzle temperature too hot • Decrease nozzle temperature
• Decrease back pressure
• Increase screw decompression
• Verify material has been dried at proper conditions
Weld Lines Melt front temperatures
too low
Mold design
• Increase pack and hold pressure
• Increase melt temperature
• Increase vent width and locations
• Increase injection speed
• Increase mold temperature
• Decrease injection speed
• Increase gate size
• Perform short shots to determine fill pattern and verify
proper vent location
• Add vents and/or false ejector pin
• Move gate location
Warp Excessive orientation
Mold design
• Increase cooling time
• Increase melt temperature
• Decrease injection pressure and injection speed
• Increase number of gates
Sticking in Mold Cavities are overpacked
Mold design
Part is too hot
• Decrease injection speed and pressure
• Decrease pack and hold pressure
• Decrease nozzle and barrel temperatures
• Decrease mold temperature
• Increase cooling time
• Increase draft angle
• Decrease nozzle and barrel temperatures
• Decrease mold temperature
• Increase cooling time
TROUBLESHOOTING RECOMMENDATIONS
www.avient.com
Copyright © 2020, Avient Corporation.
https://www.avient.com/news/avient-expands-high-performance-materials-portfolio-edgetek-toughened-ppa
The new impact-modified PPA materials are formulated in filled and unfilled grades that deliver exceptional structural integrity and impact resistance at high temperatures.
Light-weighting solutions that replace heavier traditional materials like metal, glass and wood, which can improve fuel efficiency in all modes of transportation and reduce carbon footprint
https://www.avient.com/sites/default/files/2020-10/luxury-closures-gravi-tech-design-guide-2.0-application-specific.pdf
Without venting, burning and no-fill areas can
occur .
The relative shear rate
is determined by the fill time.
This
pressure is high at the gate area and low at the
end of fill.
https://www.avient.com/sites/default/files/2020-10/2020-gravi-tech-processing-guide.pdf
Place vents at the end of fill and anywhere potential
knit/weld lines will occur.
2.
Perform short shots to determine fill
pattern and verify proper vent location
6.
Perform short shots to determine fill
pattern and verify proper vent location
4.
https://www.avient.com/sites/default/files/2020-09/surround-processing-guide-2020.pdf
Furthermore, Surround formulations offer improved performance in the areas of creep and fatigue resistance,
dimensional stability, and surface finish when compared to traditional highly-filled, short fiber formulations.
TEMPERATURE
Material
Rear
°F (°C)
Center
°F (°C)
Front
°F (°C)
Nozzle
°F (°C)
Melt
°F (°C)
Mold
°F (°C)
Nylon 6,6
14% NiCF
540–570
(280–300)
530–560
(275–290)
530–560
(275–290)
540–570
(280–300)
540–570
(280–300)
200–300
(90–150)
Nylon 6,6
30% SS
540–570
(280–300)
530–560
(275–290)
530–560
(275–290)
540–570
(280–300)
540–570
(280–300)
200–300
(90–150)
PBT
14% NiCF
510–410
(265–280)
490–540
(255–280)
480–530
(250–275)
480–530
(250–275)
480–530
(250–275)
150–250
(65–120)
PC
14% NiCF
540–570
(280–300)
540–570
(280–300)
530–560
(275–290)
530–560
(275–290)
530–560
(275–290)
150–250
(65–120)
ABS
14% NiCF
470–520
(240–270)
460–520
(240–270)
460–520
(240–270)
460–530
(240–275)
460–530
(240–275)
100–200
(40–90)
PP
14% NiCF
440–480
(225–250)
440–480
(225–250)
430–470
(220–245)
420–460
(215–240)
420–460
(215–240)
125–175
(50–80)
DRYING
Material
Temperature
°F (°C)
Time
Minimum
Moisture
Maximum
Moisture
Nylon 6,6
14% NiCF
180 (80) 4–5 hours 0.05% 0.20%
Nylon 6,6
30% SS
180 (80) 4–5 hours 0.05% 0.20%
PBT
14% NiCF
250 (120) 6-8 hours 0.02% 0.03%
PC
14% NiCF
250 (120) 3–4 hours 0.02% 0.02%
ABS
14% NiCF
200 (90) 2–4 hours 0.05% 0.10%
PP
14% NiCF
180 (80) 2–4 hours 0.20% 0.30%
Equipment
• Feed throats smaller than 2.5" may cause bridging due to pellet size
- Larger feed throats will be more advantageous with long fiber EMI shielding resins
• General purpose metering screw is recommended
- Mixing/barrier screws are not recommended
• L/D ratio
- 18:1–20:1 (40% feed, 40% transition, 20% metering)
• Low compression ratio
- 2:1–3:1
• Deep flights recommended
- Metering zone 3.5 mm
- Feed zone 7.5 mm
• Check ring
- Three-piece, free-flowing check ring
• General purpose nozzle (large nozzle tips are recommended)
- Minimum orifice diameter of 7/32"
- Tapered nozzles are not recommended for long fiber EMI shielding resins
• Clamp tonnage:
- 2.5–5 tons/in2
Gates
• Large, free-flow gating recommended
- 0.25" x 0.125" land length
- 0.5" gate depth
Runners
• Full round gate design
• No sharp corners
• Minimum of 0.25" diameter
• Hot runners can be used
PROCESSING
Screw Speed Slower screw speeds are recommended to protect fiber length
Back Pressure Lower back pressure is recommended to protect fiber length
Pack Pressure 60–80% of max injection pressure
Hold Pressure 40–60% of max injection pressure
Cool Time 10–30 seconds (depends on part geometry and dimensional stability)
PROCESS CONSIDERATIONS
Recommended – retain fiber length (maximize conductivity)
• Low shear process
• Low screw speed and screw RPM
• Slow Injection speed
• Fill to 99–100% on first stage of injection
- Reduces potential nesting of fibers at gate location
- Improves mechanical performance near gate location
- Promotes ideal fiber orientation
Resin Rich Surface
• Achieved when using a hot mold temperature and longer cure times
≥ Max mold temperature recommendation
• Improved surface aesthetic
• Reduced surface conductivity
• Could reduce attenuation performance in an assembly
Fiber Rich Surface
• Achieved when using a cold mold temperature and shorter cure times
≤ Minimum mold temperature recommendation
• Improved surface aesthetic
• Reduced surface conductivity
• Could improve attenuation performance in an assembly
www.avient.com
Copyright © 2020, Avient Corporation.
https://www.avient.com/news/archives?page=28
Avient Exhibits New Bio-Filled Polymers and Sustainable Solutions Portfolio at Fakuma 2021
Avient Launches New Bio-Filled Polymer Grades at Fakuma 2021
Caption: Toothbrush handles and combs made using reSound™ NF bio-filled polymers
[To download a high-resolution image, please click here: FOR MEDIA
https://www.avient.com/sites/default/files/2022-07/ECCOH 5161 - OFC Blowing Application in Railways - Application Snapshot.pdf
OFC TECHNOLOGY
LEADER
M I C R O B U N D L E S I N B L O W I N G
A P P L I C A T I O N F O R R A I L W A Y S
• Strippable with fingers for easy installation/access to fibers
• High speed processing at a low wall thickness
• Low shrinkage
• Resistance to chemicals and filling compounds
• Meet XP C93-850-1-1 standard
• Re-designed cable to provide advantageous
functional and economical value
• Improved flexibility compared to PBT and PP
tubes, allowing longer blowing distances on paths
with angles of 90°
• Increased processing speed and improved ease
of installation
• Provided better cable lifetime value compared to
alternative solutions
ECCOH™ 6151 UV SEPAP Formulation
KEY REQUIREMENTS
WHY AVIENT?
https://www.avient.com/sites/default/files/resources/Universal_Polyamide_Overmold_Thermoplastic_Elastomer.pdf
This helps TPE flow and fill thin walled sections commonly encountered in over molding.
Table 2 summerizes the data of different polyamide systems; polyamide 6,
polyamide 66, glass filled, fiber reinforced , impact modified and heat stabilized.
No Nylon Type Nylon description TPE
Hardness
Aging
condition
Peel,
N/mm / lb
/ in
1 Capron 8333GHI Glass and impact 60A(1) Aging A 3.7 / 21
2 Capron 8333GHI Glass and impact 60A(1) Aging B 3.2 / 20
3 Capron 8333GHI Glass and impact 60A(1) Aging C 3.3 / 19
4 Capron
8333GHIHS
Glass, impact and heat
stabilized
60A(1) Aging A 3.2 / 20
5 Capron
8333GHIHS
Glass, impact and heat
stabilized
75A Aging A 3.0 / 17
6 Ultramid B3ZG6 Glass and impact 60A(1) Aging A 3.2 / 18
7 Zytel 70G33L Glass 60A(1) Aging A 3.9 / 22
8 Zytel 408AHS Heat stabilized and flow
aid
60A(1) Aging A 3.7 / 21
9 Zytel 409AHS Heat stabilized and flow
aid
60A(1) Aging A 3.2 / 20
Aging A: nylon substrate conditioned at room temperature and humidity for 4 weeks before TPE
overmolding.