Method for evaluating efficacy of a hair styling product

Details Method for evaluating efficacy of a hair styling product Method for evaluating efficacy of a hair styling product

1985-11-04

1987-01-13

McNeill, Gregory E.

Toilet

Nail device

Compound tools

A45D 700

Patent

active

046356541

ABSTRACT:
The ability of a hair styling material to enhance the holding power of a curl is determined by a comparison with the holding power of hair set only with water. A tress of hair is wetted and wrapped around a cylinder and held in place until dried. A similar curled tress is treated with a hair styling material. Each of the tresses is compressed across a diameter and the force and deflection are measured. The work of deformation of the treated loop of hair is compared with the work of deformation of the water treated loop of hair by finding the ratio between the two works of deformation. This ratio is a "hold factor" for the hair styling material.

REFERENCES:
patent: 2808838 (1957-10-01), Stageberg
patent: 2836185 (1958-05-01), Hervey
patent: 3242052 (1966-03-01), Sheffner
patent: 3250682 (1966-05-01), Wilmsmann et al.

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