Rupture testing for gloves
View Patent ↗An apparatus for measuring the penetration depth of a blunt object before failure of a film sample, such as a glove. Failure occurs when a film sample secured to a column ruptures from the force applied by a stylus. The penetration depth of the blunt object is equal to the distance traveled by the stylus under the method of the invention. With the measurement of the penetration depth and the force applied by the stylus, a quantitative measurement of the rupture strength of the film sample is obtained.
1. A method for testing a film sample, comprising:
securing the sample to the top end of a column,
forming an aperture in the bottom of said column for vacuum protecting,
lowering a stylus to contact the sample until movement of the stylus is not possible without movement of the sample,
recording a vertical height of the stylus,
moving the stylus downward until the sample ruptures,
measuring the distance traveled by the stylus from the starting point and the rupture point, and
measuring the force applied by the force applied by the stylus at rupture.
2. The method of claim 1 , wherein the stylus is lowered at a constant speed.
3. The method of claim 2 , wherein said constant speed is 508.0 mm/min.
4. The method of claim 1 , wherein the sample is a glove finger.
5. The method of claim 1 , wherein the sample is taken from a glove palm or glove cuff.
6. The method of claim 1 , wherein the sample is a uniform thickness film.
7. The method of claim 1 , further comprising calculating the rupture strength of the sample by using the formula:
(
0.5
)
*
(
Stylus
Travel
Distance
at
Rupture
)
*
(
Stylus
Force
at
Rupture
/
Sample
Thickness
)
.
8. The method of claim 1 , wherein said stylus is longer than said column.
9. The method of claim 1 , wherein said column has a diameter of 30 mm and said stylus has a diameter of 7 mm.
10. A method for calculating the penetration depth of a blunt object for a film sample, comprising:
securing the sample to the top end of a column by extending the edge of the sample along the outside surface of the column,
lowering a stylus to contact the sample until movement of the stylus is not possible without movement of the sample,
recording a vertical height of the stylus,
moving the stylus downward until the sample ruptures, and
measuring the distance traveled by the stylus from the starting point and the rupture point.
11. The method of claim 10 , wherein the stylus is lowered at a constant speed.
12. The method of claim 11 , wherein said constant speed is 508.0 mm/min.
13. The method of claim 10 , wherein the sample is a glove finger.
14. The method of claim 10 , wherein the sample is taken from a glove palm or glove cuff.
15. The method of claim 10 , wherein the sample is a uniform thickness film.
16. The method of claim 10 , wherein said stylus is longer than said column.
17. A method for testing a film sample, comprising:
securing the sample to the top end of the column by extending the edge of the sample along the outside surface of the column,
lowering a stylus to contact the sample until movement of the stylus is not possible without movement of the sample,
recording a vertical height of the stylus,
moving the stylus downward until the sample ruptures,
measuring the distance traveled by the stylus from the starting point and the rupture point, and
measuring the force applied by the force applied by the stylus at rupture.