Textiles: manufacturing – Textile product fabrication or treatment – Fiber entangling and interlocking
Patent
1990-11-02
1992-11-24
Schroeder, Werner H.
Textiles: manufacturing
Textile product fabrication or treatment
Fiber entangling and interlocking
A61F 1322
Patent
active
051651521
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process and apparatus according to the pre-characterizing clauses of claims 41 and 60.
A process and an apparatus of the abovementioned generic type are known from Swiss Patent Specification 355,255. In this, a wad roll is folded on itself in the longitudinal direction and surrounded by a sheathing band, the mutually overlapping longitudinal sides of which are connected to one another by means of heated press rollers. The fibre rod is then severed into individual length portions which are thereupon pressed intermittently in a press to form tampons. The sheathing band at the same time forms the recovery band for the tampon.
A process and an apparatus are known from U.S. Pat. No. 3,523,535, and in these an air-placed wood-pulp layer is applied to a nonwoven sheathing band of viscose fibres and is fed between two conveyor belts to a nozzle-like die which gives the rod of material a circular cross-section The rod of material is thereafter guided over a table, above which are arranged a glue applicator device for closing the sheathing band and two press rollers which exert slight pressure on the rod of material in order to stabilize its form, before the rod is subsequently cut into individual tampon lengths.
The object on which the invention is based is to improve the process and apparatus for the continuous production of absorbent bodies according to the pre-characterizing clauses of Patent claims 1 and 21, in such a way as to obtain a high-speed process and a corresponding apparatus for the production of those absorbent bodies which are suitable particularly as tampons for feminine hygiene and which, whilst preserving essential properties of known tampons, have an increased stability or buckling resistance.
The invention achieves this object by means of the features mentioned in the characterizing clauses of Patent claims 1 and 21.
As a result of the invention, the properties of the absorbent bodies can easily be matched to their particular intended use. At the same time, it is guaranteed that the mass production of the absorbent bodies will be extremely economical, because it is continuous. The range of variation of the process according to the invention and of the apparatus according to the invention makes it possible, for instance, to apply a sheathing band to the absorbent body and to produce absorbent bodies with or without a different number of longitudinal grooves which, when the absorbent bodies are used as tampons, contribute considerably to increasing the stability and absorption rate of such tampons. These advantages are achieved even though all the operations of processing the fibre material take place continuously, that is to say at no time in the process is there any interruption in the work cycle or any intermittent processing.
The invention is explained in detail below by reference to the diagrammatic drawing of an exemplary embodiment of the apparatus according to the invention. In the drawing:
FIG. 1 shows a partially diagrammatic perspective view of the apparatus according to the invention with folding, sheathing-band application, press and severing stations;
FIG. 2 shows a top view of the folding pattern of the web of fibre material;
FIG. 3 shows a cross-section along the line 3--3 of FIG. 2, showing the first folding of the web of fibre material;
FIG. 4 shows a cross-section along the line 4--4 of FIG. 2, showing the second folding of the web of fibre material;
FIG. 5 shows a cross-section along the line 5--5 of FIG. 2, showing the third folding of the web of fibre material;
FIG. 6 shows a cross-section along the line 6--6 of FIG. 2, showing the folded web of fibre material after a side edge has been laid round onto the top side of the folded part of the web of fibre material.
FIG. 7 shows a perspective front view of the sheathing-band application station;
FIG. 8 shows a perspective front view of the press station;
FIG. 9 shows a perspective rear view of a guide positioned between mutually adjacent pairs of rollers in the press station;
FIG. 10 shows a top view
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Kramer Wolfgang
Pesendorfer Fritz
Schwankhardt Gerhard
Mc-Neil-PPC, Inc.
Schroeder Werner H.
Vanatta Amy Brooke
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