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Modern Packaging Magazine - September 1958 - Return to Main Search
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cular area where the film is tangent to the ball. But if slippage occurs, the contact surface will be stretched, thus increasing the stress in that concentrated area.

The electrostatic qualities of the film and the preconditioning and migration of slip agents might also influence the geometry of the puncture. Moreover, controlled investigation has proved that the steel-ball size has a definite effect on the falling ball test results.

Conclusion

In summary, our confidence in the tensile impact test as described is high. It is useful for testing a wide variety of both materials and fabrication techniques; i.e., compression molded, injection molded or film. It is concluded that the tensile impact test may be used as a satisfactory substitute for the increment-height bag drop test. By so doing, more precise and accurate impact data may be obtained. However, the thickness effect which is not taken into account in the bag drop test may be included in the results of the impact test by a simple conversion. When this is done, a good statistical correlation between the tensile impact test and the bag drop test results. It is concluded, therefore, that the tensile impact test should replace the bag drop test and that the correlation chart should be abandoned after this transformation has been made.

References

1.    Bragaw, G. G., "Tensile Impact: A Simple Meaningful Impact Test," Society of Plastics Engineers, Technical Papers, 12th Annual National Technical Conference, Vol. II, pp. 240-246.

2.    Ninneman, Karl W., "New Pendulum Impact Tester," Modern Packaging, Nov., 1956, p. 163.

3.    Timoshenko & MacCullough, Elements of Strength of Materials, D. Van Nostrand Co., Inc., New York.

4.    Lessells, J. M., Strength and Re

sistance of Metals, John Wiley & Sons, Inc., 1954, pp. 112-160;    1949, pp.

320-325.

5.    Maxwell, B., Harrington, J. P., and Monica, R. E., Tensile Impact Properties of Some Plastics, Plastics Laboratory Technical Report 24A, Jan. 31, 1952, Princeton University.

6.    Bragaw, C. G., Private Communication.

7.    Flierl, D. W., "Methods of Rating Film Durability," Modern Packaging, Nov., 1951, p. 129.

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