Lyondell Chemical — Technical Presentation (September 2005)
21 slides from Lyondell Chemical's technical presentation, September 2005
Slide 1: The Effect of Orientation on MD-Tear of HMW-HDPE Films
2005 PLACE Conference September 27-29 Las Vegas, Nevada The Effect of Orientation on MD-Tear of HMW-HDPE Films H. Mavridis, A. Bafna & J. Merrick-Mack Presented by: H. Mavridis Research Scientist Lyondell Chemical Company
Slide 2: Problem Statement and Objective
Problem Statement Thin HMW-HDPE films are highly oriented Orientation is generally detrimental to MD-Tear Would a thin, low orientation film, have high MD-Tear? Objective Brief review of orientation effects in HMW-HDPE Fabrication of high & low orientation, thin HMW-HDPE film Relationshi
Slide 3: Outline
Outline Problem statement & objective Orientation effects in HMW-HDPE film Effect of neck height (strain-rate) Effect of film thickness (strain and strain-rate) Fabrication of low-orientation, thin HMW-HDPE film via coextrusion MD-Tear results Orientation results (WAXS, SAXS, AFM) Effe
Slide 4: Effects in HMW-HDPE Film
Orientation Effects in HMW-HDPE Film Example with high and low-neck height Orientation effect through increased strain-rate 0.5 mil HMW-HDPE 4:1 BUR, 12 lb/hr-in Neck Height=8DD Neck Height=3DD
Slide 5: Effects in HMW-HDPE Film (cont'd)
Orientation Effects in HMW-HDPE Film (cont’d) Strain-rate higher for lower neck height (higher orientation) 4.0 8DD Neck Height 3.5 0.5 mil Film 3DD Neck Height Ext. Strain-Rate (1/sec) 3.0 2.5 2.0 1.5 NECK NECK 1.0 0.5 0.0 0 2 4 6 8 10 12 Height (DD)
Slide 6: Effect of neck height on thin film properties
Orientation Effects in HMW-HDPE Film (cont’d) Effect of neck height on thin film properties MD-Tear = 19 g TD/MD-Tear ~ 1.0 Impact = 1.1 ft-lbs (TEDD) MD-Tear= 4 g 8DD Neck TD/MD-Tear ~ 83 Height Impact = 0.2 ft-lbs (TEDD) 3DD Neck Height
Slide 7: Effects in HMW-HDPE Film: variable film thickness
Orientation Effects in HMW-HDPE Film Example with variable film thickness (drawdown) Orientation effect through increased strain & strain-rate Film T hickness (microns) 150 6 0 25 50 75 100 125 125 5 L5005 Specific MD-Tear Specific MD-Tear XL3805 4 (g/micron) 100 (g/mil) 75 3 50 2 25 1 0 0 0 1 2
Slide 8: Effects in HMW-HDPE Film (cont'd)
Orientation Effects in HMW-HDPE Film (cont’d) Strain & Strain-rate higher for lower film thickness (higher orientation) 100 4.0 3.5 8DD Neck Height 8DD Neck Height Ext. Strain-Rate (1/sec) Axial Drawdown Ratio 3.0 0.5 mil 2.5 0.5 mil 2 mil 2 mil 10 2.0 4 mil 4 mil 1.5 1.0 0.5 1 0.0 0 2 4 6 8 10 12
Slide 9: Fundamental Hypothesis
Fundamental Hypothesis Fabricate a thin HMW-HDPE film under low orientation conditions in order to maximize MD-Tear How? Hint: low orientation conditions prevail for “thick” films Testing Produce a “thick,” coextruded film such that a “thin” HMW-HDPE layer can be peeled off HDPE/Nylon/HDPE c
Slide 10: Fabrication of Low-Orientation, Thin HMW-HDPE Film via Coextrusion
Fabrication of Low-Orientation, Thin HMW- HDPE Film via Coextrusion Coextrude with nylon (does not adhere to HDPE) Fabricate thick coex film and peel off thin HDPE layer 4:1 BUR, 12 lb/hr-in Neck Height=8DD 0.5 mil HMW-HDPE 4 mil, Coextruded A/B/A Coex: 2.3 mil HDPE 1.2 mil Nylon 0.5 mil HDPE
Slide 11: Justification of Coextrusion Approach
Justification of Coextrusion Approach Thin HDPE layer, peeled off a thick, nylon-coextruded structure, experiences the strain (drawdown) and strain- rate of a “thick” film Strain (drawdown) and strain-rate are inversely related to film thickness (all other film conditions similar) Lower strain
Slide 12: MD-Tear Results
MD-Tear Results 6 Specific MD-Tear (g/micron) Specific MD-Tear (g/mil) 140 5 120 100 L5005 4 80 XL3805 3 60 2 40 1 20 0 0 (MD-Tear) per (MD-Tear) per Coex (MD-Tear) thickness @12.7 thickness per thickness microns (0.5 mil) @101.6 microns @12.7 microns (4 mil) (0.5 mil)
Slide 13: MD-Tear and Orientation Effects for L5005
MD-Tear and Orientation Effects for L5005 100 1.0 Specific M D-T ear Specific MD-Tear (g/mil) 80 Lamella M D-Orientation 0.8 f( lam, MD) 60 0.6 40 0.4 20 0.2 0 0.0 Standard 0.5 mil Standard 4.0 mil 0.5 mil film peeled film (Run 3B) film (Run 3A) from coex 4.0 mil film (Run 1)
Slide 14: Orientation Results (L5005) - SAXS
Orientation Results (L5005) - SAXS Standard 0.5 mil Film Standard 4.0 mil Film 0.5 mil Film Peeled from (Run 3B) (Run 3A) Coex 4 mil (Run 1) MD TD
Slide 15: Orientation Results - AFM
Orientation Results - AFM 0.5 mil L5005, monolayer MD Standard 0.5 mil Film (Run 3B)
Slide 16: Orientation Results - AFM (cont'd)
Orientation Results – AFM (cont’d) 4 mil L5005, monolayer MD Standard 4.0 mil Film (Run 3A)
Slide 17: Orientation Results - AFM (cont'd)
Orientation Results – AFM (cont’d) 0.5 mil L5005 co-ex with Nylon MD 0.5 mil Film Peeled from Coex 4 mil (Run 1)
Slide 18: Effect of Orientation on Film Properties
Effect of Orientation on Film Properties (MD-Tear)/ Thickness MD-Tear 250 250 200 200 150 150 Tensile @Break (MD) (TD-Tear)/ Thicknes Tensile @Break (MD) TD-Tear 100 100 50 50 0 0 Tensile Yield (MD) TEDD/ Thickness Tensile Yield (MD) TEDD L5005, 4.0 mil (Run 3A) L5005, Run 1 (Coex) L5005, 0.5 mil (R
Slide 19: Effect of Orientation on Tensile Properties
Effect of Orientation on Tensile Properties 70,000 0.5 mil L5005/Coex-MD 70,000 0.5 mil L5005/Coex-TD 4 mil L5005-MD 4 mil L5005-TD 60,000 0.5 mil L5005-MD 60,000 0.5 mil L5005-TD 50,000 True Stress (psi) 50,000 True Stress (psi) 40,000 40,000 30,000 30,000 20,000 20,000 10,000 10,000 0 0 -1 0 1 2 3
Slide 20: Concluding Remarks
Concluding Remarks Thin HMW-HDPE films are highly oriented Orientation is detrimental to MD-Tear Coextrusion technique described for producing thin, low orientation HMW-HDPE films MD-Tear / Orientation relationship demonstrated via WAXS, SAXS and AFM Thin, low orientation films do have hig
Slide 21: Thank You
Thank You PRESENTED BY Harry Mavridis Research Scientist Lyondell Chemical Company Please remember to turn harry.mavridis@equistar.com in your evaluation sheet...
Lyondell Chemical Company — Technical Presentation (September 2005) on 6ix