Stock material or miscellaneous articles – Hollow or container type article – Cellular material derived from plant or animal source
Patent
1983-12-12
1987-06-23
Bell, James J.
Stock material or miscellaneous articles
Hollow or container type article
Cellular material derived from plant or animal source
428 74, 428121, 428124, 428182, 428222, 428284, 604367, 604385, 604904, B27N 502
Patent
active
046752170
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an absorbing product which can comprise a round wipe-off pad of the type used in medical treatment for wiping-off blood and other body liquids at surgical operations and treatment of injuries and wounds on the human body and also for applying disinfecting agents on skin areas before surgery is performed. However, the absorbing product according to the invention can also be constructed as a tampon, e.g. a menstrual tampon or as means for absorbing liquids in different connections e.g. for absorbing and limiting oil spillage on floors, the ground, or on water.
Round wipe-off pads in available embodiments thereof are made of gauze and are formed as a substantially round ball or a cylindrical pad. In the most common embodiment there is applied inside the pad a rubber string which fixes the gauze and keeps it together in the round shape. The gauze inside such a wipe-off pad is not regularly orientated; it is concentrated to one or more locations, the gauze therein often having been torn in the process of manufacture. If the rubber string breaks, which happens relatively frequently, a rag of gauze with loose threads is left.
As far as conventional menstrual tampons are concerned, there are usually made of carded cotton which is rolled and compacted to a diameter of 12 to 13 mm. Since it is desired that the tampon shall be able to expand radially to about twice the diameter at absorption, it is common to fold the cotton when compacting same. In this manner the circumference is increased at the outer surface such that it will approach the circumference at the double diameter.
The tampon can expand to the maximum volume while absorbing liquid only if it is free. In that condition, the maximum absorption factor is also attained, said factor being defined as ##EQU1##
When the tampon is inserted into the vagina, it can expand during absorption only until equilibrium is obtained between the expansion force due to the absorption and the contraction force from the walls of the vagina. The expansion force due to the absorption is inversely proportional to the diameter increase, i.e. it decreases in relation to the diameter increase, while the contraction force from the walls of the vagina are substantially proportional to the diameter increase.
The conclusion will be that the tampon practically never can attain the maximum volume attained when the tampon is free. Therefore, also the maximum absorption factor is not obtained. Practical tests with conventional homogenous tampons also have shown that the absorption will be limited when expansion of the tampon is prevented mechanically. The absorbing material proper blocks the absorption.
The Swedish published specification No. 7714725-4 (publication number 422 407) describes a method of manufacturing round wipe-off pads of gauze by which there is obtained a round wipe-off pad which consists of a substantially cylindrical cartridge having an inner layer and an outer layer on the outside thereof, which merge into each other at a twisted portion at one end of the cartridge while the cartridge is folded inwards at the other end. This round wipe-off pad represents a considerable improvement in relation to the round wipe-off pads with a rubber string, because it is held together without a rubber string or other adhering means and does not present any torn irregular material.
The invention relates to a development of the round wipe-off pad according to said published specification, but the object thereof is to provide an absorbing product which is considerably more useful than as a round wipe-off pad only and has a considerably wider range of use. Said round wipe-off pad comprises a substantially cylindrical cartridge of a web material with a first inner layer and a second layer located on the outside of said inner layer, which merge into each other at a twisted portion at one end of the cartridge. The product can be manufactured in a rational manner by an extensively automated process of manufacture which, moreover, is not limited to the traditiona
REFERENCES:
patent: 2328795 (1943-09-01), Finks
patent: 4278088 (1981-07-01), Reeves et al.
patent: 4341214 (1982-07-01), Fries et al.
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