Influence of Processing Conditions On the Peel Behavior of Polyethylene/ Polybutene-1 Peel Systems

Abstract

The specific peel system low-density polyethylene/isotactic polybutene-1 (PE-LD/iPB-1), which is often used for protective packages, was investigated in this study. The required peel force to open the package depends on the content of iPB-1 and on the processing conditions of the blowing process. Commercial products have a constant amount of iPB-1. Thus, a defined peel force can be adjusted by varying the processing conditions. The standard peel system PE-LD with 6 wt% iPB-1 was investigated in dependence on the processing conditions. The most important processing parameters of the processing line (extruder, die head, tube forming area) were varied and their influence on the peel properties was examined. For example the temperatures of the melt within the extruder, the size of the die gap within the die head, and the cooling behavior of the film bubble were investigated. Higher melt temperatures within the extruder decreased the peel force. The investigations also revealed a strong dependence of the peel force on the size of the die gap and on the degree of cooling. The new developed parameter time of solidification was used to characterize the cooling behavior.

Keywords

polyethylene/polybutene-1 films blowing process processing conditions peel test peel force.

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References

Lindenmeyer, P.H. and Lustig, S. (1965). Crystallite Orientation in Extruded Polyethylene Film, J. Appl. Polym. Sci., 9(1): 227-240.

Wagner, M.H. ( 1976). Das Folienblasverfahren als rheologischthermodynamischer Prozess, Rheologica Acta, 15(1): 40-51.

Kusnezow, N.A. , Nossalewitsch, I.M. and Pacharenko , W.A. (1981). Untersuchung zum Einfluss der molekularen Kennwerte und der Kuühlbedingungen auf die übermolekulare Struktur von Polyethylen, Plaste und Kautschuk, 28: 333-336.

Berger, W. , Gräfe, F. and Kammer, H.W. ( 1984). Zur Extrusion von Polyethylen hoher Dichte im festen Zustand, Acta Polymerica, 35(7): 504-508.

Kanai, T. and White, J.L. ( 1984). Kinematics, Dynamics and Stability of the Tubular Film Extrusion of Various Polyethylenes, Polym. Engg. & Sci. , 24(15): 1185-1201.

Huang, T.A. and Campbell, G.A. ( 1985). Deformational History of LLDPE/ LDPE Blends on Blown Film Equipment, Adv. Polym. Technol., 5(3): 181-192.

Lohse, G. and Marinow, S. ( 1986). Modell des Folienblasprozesses zur Beschreibung von elastischen Deformationen I - Modell des Folienblasprozesses, Plaste und Kautschuk, 33: 106-110.

Lohse, G. and Marinow, S. ( 1986). Modell des Folienblasprozesses zur Beschreibung von elastischen Deformationen III - Lösung und experimentelle Uberprüfung des Modells , Plaste und Kautschuk, 33: 221-226.

Patel, R.M. , Butler, T.I. , Walton, K.L. and Knight, G.W. ( 1994). Investigation of Processing-structure-properties Relationships in Polyethylene Blown Films, Polym. Eng. Sci., 34(19): 1506-1514.

10.

Tanoue, S. and Iemoto, Y. ( 1999). Effect of Die Gap Width on Annular Extrudates by the Annular Extrudate Swell Simulation in Steady-states, Polym. Eng. Sci., 39(11): 2172-2180.

11.

Ghaneh-Fard, A. (1999). Effects of Film Blowing Conditions on Molecular Orientation and Mechanical Properties of Polyethylene Films, J. Plas. Film Shtg, 15(3): 194-218.

12.

Small, C.M. , McNally, G.M. , Marks, A. and Murphy, W.R. (2002). The Effect of Extrusion Processing Conditions and Polyisobutylene Concentration on the Properties of Polyethylene for Stretch and Cling Film Applications, J. Plas. Film Shtg, 18(4): 245-258.

13.

Elkoun, S., Huneault, M.A., McCormick, K., Puterbaugh, F. and Kale, L. (2005). LLDPE-Based Mono- and Multilayer Blown Films: Effect of Processing Parameters on Properties, Polym. Eng. Sci., 45(9): 1214-1221. 14. Pelcz, A., Illés, T. and Horváth, Z. (2007). Folienproduktion mit geöffnetem Schlauch, Kunststoffe, 10: 295-299.

14.

Kamykowski, G.W. (2000). Factors Affecting Adhesion of Tie Layers between Polypropylene and Polyamides, J. Plas. Film Shtg, 16(3): 237-246.

15.

McNally, G.M. , Small, C.M. , Murphy, W.R. and Clarke, A.H. (2005). The Effect of PIB Molecular Weight on the Cling Characteristics of Polyethylene-PIB Films for Stretch and Cling Film Applications, J. Plas. Film Shtg, 21(1): 55-68.

16.

Hwo, C.C. (1987). Polybutylene Blends as Easy Open Seal Coats for Flexible Packaging and Lidding, J. Plas. Film Shtg, 3(4): 245-260.

17.

Stober, P. and Rist, H. ( 2004). Leicht und gefahrlos öffnen, Künststoffe , 6: 66-69.

18.

Nase, M. , Langer, B. , Baumann, H.J. , Grellmann, W. , Geißler, G. and Kaliske, M. ( 2008). Evaluation and Simulation of the Peel Behavior of Polyethylene/polybutene-1 Peel Systems, J. Appl. Polym. Sci., 111(1): 363-370.

19.

Geißler, G. , Kaliske, M. , Grellmann, W. and Nase, M. (2007). Peel Process Simulation of Sealed Polymeric Film - Computational Modeling of Experimental Results , Engineering Computations, 24(6): 586-607. (Winner of the ‘Outstanding Paper Award’ 2008 of the Emerald Literati Network).

20.

Nase, M. , Androsch, R. , Langer, B. , Baumann, H.J. and Grellmann, W. ( 2008). Effect of Polymorphism of Isotactic Polybutene-1 on Peel Behavior of Polyethylene/polybutene-1 Peel Systems, J. Appl. Polym. Sci., 107(5): 3111-3118.

21.

Petrie, C.J.S. (1975). A Comparison of Theoretical Predictions with Published Experimental Measurements on the Blown Film Process , AICHE Journal, 21(2): 275-282.

22.

ASTM D 1876: Standard Test Method for Peel Resistance of Adhesives (T-Peel Test), 2001.

23.

Uhland, E. ( 1976). Modell zur Beschreibung des Fließens wandgleitender Substanzen durch Düsen, Rheologica Acta, 15(1): 30-39.

24.

Roucourt, I. ( 2007). The Use of Polybutene-1, In: Film Applications, International Conference ‘Dubai Plast Pro 2007,’ Dubai, UAE, 23-25 March.

25.

Nase, M. , Zankel, A. , Langer, B. , Baumann, H.J. , Grellmann, W. and Poelt, P. ( 2008). Investigation of the Peel Behavior of Polyethylene/Polybutene-1 Peel Films Using in-Situ Peel Tests with Environmental Scanning Electron Microscopy , Polymer, 49(25): 5458-5466.