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10 Easy Ways to Analyze
Your P lastic Parts forEnsuring Optimum
Performancepresented by:
www.traininteractive.com | (tel) 978.957.0700
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10 Easy Ways to Analyze Your Plastic Parts
Visual Inspection
Dimensional
Polarized Light
Burn Test
Density Heat Distortion
Viscosity
Weight Solvent
Regrind
Special Offer
Questions & Answers
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Visual Inspection
Can Be Used To Locate:
Stresses Cracking
Crazing
Degradation Burning
Discoloration
Contamination
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Visual Inspection
Enhanced Vision:
Adjustable Lighting High Power Lamps
Increased Magnification
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Visual Inspection
Different Lighting:
Ultraviolet Fluorescent
Incandescent
Halogen Sodium Vapor
LED light bulbs
Black Light
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Dimensional
After Molding, Polymers:
Shrink Warp
Distort
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Dimensional
These Effects Are Exponential
Over Time, Often On A Log Scale.
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Dimensional
Take Dimensions After:
30-60 MinutesAnnealing
Simulating End Use
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Polarized Light
Polarized Light Inspection:
Determine Stress Concentrations Determine Degree Of Crystallinity
Determine Amount Of Orientation
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Polarized Light
When You Polarize Light, You
Essentially Cause All Light Waves
To Vibrate In One Direction.
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Polarized Light
If You Oppose Two Polarized
Plates At 90, The Light Does Not
Pass Through Second Plate.
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Polarized Light
Light Waves Passing Through A
Translucent Part Can Be Rotated
When They Encounter Stresses.
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Polarized Light
Only Rotated Light Waves
Pass Through The Second Plate,
Highlighting Stresses And
Crystallinity.
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Burn Test
When Exposed To Flame, Some Polymers:
Burn Quickly or Slowly Char
Cracks
Melt Drip
Give Off Odor Or Smoke
Give A Colored Flame
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Burn Test
When Flame Is Removed, Some Polymers:
Burn Quickly or Slowly Char
Cracks
Melt Drip
Give Off Odor Or Smoke
Self Extinguish
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Burn Test
Acetals, For Example:
Burn Slowly With A Blue Flame Do Not Smoke
Continue To Burn After Flame Is Removed
Drip When Burning Smells Of Formaldehyde
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Burn Test
Safety Issues:
Perform Test Outside Or Under Proper Ventilation
Waft, Never Smell Directly
Do Not Hold In Your Hand Have A Bucket Of Water Nearby
Do Not Stand Over Sample
Use Proper PPE
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Density
Mass Divided By Volume:
g/cm3 = g/ml
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Density
Water Is Most Common Comparison
H2O Density = 1.000 g/cm3
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Density
Signifies:
Polymer Type Degree Of Crystallinity
Degree Of Packing
May Help Find Voids
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Density
To Determine:
1. Weigh Part (grams)
2. Determine Volume (ml or cm3)
3. Density = Weight/Volume
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Density
Amorphous Vs. Crystalline
Polymer Da (g/cm3) Dc (g/cm3)
Polyethylene 0.853 1.004
Poly(Vinyl Alcohol) 1.291 1.350
Poly(Vinyl Chloride) 1.412 1.477Poly(Vinylidene Chloride) 1.775 1.957
Poly(Ethylene Terephthalate) 1.336 1.514
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Heat Distortion
Heat Distortion Tests Measure The
Deflection Of A Sample Of Specific Length,
Width, And Thickness Tested Under
Controlled Conditions In An Oil Bath.
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Heat Distortion
We Recommend Conducting A
Test Under Practical ConditionsRelated With Your Actual Part.
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Heat Distortion
Sample Can Be Heated In:
Oven
Water Bath
Oil Bath
Drier
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Heat Distortion
Sample Can Be Loaded:
Torsion
Compression
Flexural
WeightAssembly
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Heat Distortion
Test Can Be:
Timed Deflection
Measured Deflection
Sensor
Go / No-Go
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Viscosity
Viscosity Is Measure Of A
Polymer's Resistance To Flow.
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Viscosity
Actual Viscosity Measurements
Are Very Difficult To Obtain,
And Often Require Expensive
Lab Equipment.
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Viscosity
In Most Cases, Relative Viscosity Can Be:
Easy To Obtain
Obtained With an Existing Machine
Compare Viscosities
Using Different Times Using Different Conditions
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Viscosity
For A Given Mold
Relative Viscosity Equals
Peak Plastic Pressure At TransferMultiplied By Fill Time.
vis(R) = psi(Peak) * t(Fill)
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Weight
Document The Weight:
After Fill
After Packing
After Hold
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Weight
Multi-Cavity Mold Imbalance:
1. Mold Short Shot
2. Weigh Each Cavity
3. Determine Cavity Imbalance =
(Heaviest-Lightest) X 100% Heaviest
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Solvents
Solvents Can Identify:
Molded In Stresses
Variable Orientation
Reduced Crystallinity
Delamination Degradation
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Solvents
Solvents Can Cause:
Cracking
Crazing
Discoloration
Distortion Warpage
Brittleness
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Solvents
Application:
Soak For 15 Minutes
Aerosol Spray
Cloth Wipe
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Solvents
Solvent Attacks Can Be Accelerated
When a Sample Is Stressed.
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Regrind
You Should Test The Integrity
Of Your Regrind.
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Regrind
When Testing Regrind... First:
1. Mold Part Using 100% Virgin
2. Document Processing Parameters
Peak Pressure
Fill Time
3. Perform Any Important Or Relevant Tests
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Regrind
Then:
4. Mold Part Using 100% Regrind
5. Document Processing Parameters
Peak Pressure
Fill Time
5. Perform Any Important Or Relevant Tests
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Regrind
Lastly:
6. Determine Change In Properties
(Change) X 100% = % Change(Original)
d
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Regrind
When Performance is Critical...
Test Properties of Virgin Material
Test Properties 1st Generation Regrind
Determine Property Losses
Lower losses indicate better process
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