Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...
Reexamination Certificate
1995-04-24
2001-10-30
Weiss, John G. (Department: 3761)
Surgery
Means and methods for collecting body fluids or waste material
Absorbent pad for external or internal application and...
C604S383000, C604S385170, C604S904000, C028S118000, C028S119000
Reexamination Certificate
active
06310269
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a tampon, especially for feminine hygiene, having a relatively high density compressed core and a plurality of lower density longitudinal ribs, as well as, to a process and an apparatus for producing the tampon.
A tampon of the abovementioned generic type is known from German Auslegeschrift 1,491,161. This tampon has proved appropriate in practice because of its high absorption capacity, fluid retention capacity, rate of absorption, stability and buckling strength. For this, the tampon has longitudinal grooves which are caused by pointed press jaws and on each of the two sides of which occur longitudinal ribs which are pressed to the approximately cylindrical final form of the tampon during a subsequent pressing operation by means of press jaws with partially cylindrical press faces.
SUMMARY OF THE INVENTION
The object on which the invention is based is to improve the tampon of the abovementioned generic type in such a way that the absorption capacity and rate of absorption of the tampon appertaining to the two are essentially maintained, but the specific absorption capacity of the tampon is increased.
This and other objects are achieved by the tampon having disclosed that makes it possible to obtain an appreciable increase in the specific absorption capacity (ml/g), whilst preserving the hitherto obtained absorption capacity and rate of absorption, with a surprisingly smaller amount of fibre material being used. This effect is attributable to a coarser capillary structure of the fibre material in the outer layer of the tampon.
Thus, it was found that a tampon according to the invention consisting of 100% rayon fibres with a weight of 2.4 g without the withdrawal string can have a specific absorption capacity of 4.8 ml/g with a rate of absorption of 1.9 ml/s. The absorption capacity of such a tampon at a static counterpressure of 20 mbars is 11.3 ml. In a test with a pulsating counterpressure of 20 to 110 mbars approximating extremely closely to the practical conditions of use, the absorption capacity of the tampon according to the invention can amount to 8.0 ml and the specific absorption capacity to 3.4 ml/g.
The diameter of the tampon is set at between 13 and 15 mm according to the customary physiological conditions, and the central fibre core can preferably have a diameter of 4 to 8 mm. A high buckling strength of the tampon can thus be achieved, whilst at the same time the soft surface of the tampon guarantees a pleasant handling of the tampon.
The invention relates, furthermore, to a process for producing this tampon A process of this type is known from German Auslegeschrift 1,491,161 already mentioned.
According to the invention, this process for producing the tampon according to the invention is improved by means of pressing only narrow strip-shaped portions of the surface of the blank.
The invention relates, moreover, to an apparatus for producing the tampon and for carrying out the above-mentioned process. An apparatus of this generic type is likewise known from German Auslegeschrift 1,491,161. According to the invention, this known apparatus is improved, with the effect of the best possible production of the tampon according to the invention. The fact that only press cutters are provided on the end faces of the segment-shaped pressed jaws and of the sliding plates guarantees a merely partial pressing of the winding blank to produce a preform which is subsequently subjected only to a weak concentric shaping in the following forming die, thereby providing a smooth, soft and aesthetically pleasing surface of the tampon, but which, despite the use of a smaller amount of fibre material, allows an appreciably increased specific absorption capacity of the tampon, without the tampon suffering from a loss of absolute absorption capacity in comparison with the known tampon mentioned.
The apparatus according to the invention is advantageously developed by means of the features mentioned in the subclaims.
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EPO Search Report for Application No. 90119538.8.
Friese Axel
Simon Stefan
Mc-Neil-PPC, Inc.
Reichle Karin
Weiss John G.
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