Method and apparatus for determining the wet strength of paper

Details Method and apparatus for determining the wet strength of paper Method and apparatus for determining the wet strength of paper

1976-05-11

1977-10-25

Gill, James J.

Measuring and testing

Testing by impact or shock

Specimen impactor detail

73102, G01N 330, G01N 3334

Patent

active

040550710

ABSTRACT:
An apparatus and method are disclosed for determining the wet strength of paper. It is necessary to know the wet strength of paper in order to determine the runnability of pulp in the papermaking machine. Present devices for measuring the wet strength of paper are slow and complex. The present apparatus includes a means for releasing a ball from a predetermined height to drop freely in a vertical path, clamp means to support a sheet of wet paper and to position the sheet at a pre-determined location within the vertical path of the ball and perpendicular thereto, and means for determining speed of the ball dropping in the vertical path below the clamp means. The method includes steps of releasing a ball from a predetermined height to drop freely in a vertical path, measuring the speed of the ball at a first pre-determined location in the vertical path, positioning a sheet of wet paper in a horizontal plane at a second pre-determined location above the first location in the vertical path, releasing another ball having the same size and mass as the first ball to drop freely in the vertical path and rupture the sheet of wet paper, measuring the speed of the second ball after it has ruptured the sheet of wet paper at the first location in the vertical path and determining the rupture energy of the sheet of wet paper and thus the strength of the wet paper.

REFERENCES:
patent: 1709638 (1929-04-01), Thwing
patent: 2264412 (1941-12-01), Shindel
patent: 2648975 (1953-08-01), Eves
patent: 2748596 (1956-06-01), Tasker
"Equipment to Measure the Energy Absorption of Films at High Strain Rates" by Spangler et al., Journal of Applied Physics 3-57, pp. 329-333.

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