The present invention is concerned about a peculiar form to break and desintegrate the - fibrous estructure of natural fibrous materials, ithout affecting, however, its molecule estructure or polyme¬ rization grade of the original materials, keeping the¬ refore, its chemical proprieties.

So far, as it is well-known, the - - pulverization of fibrous natural materials of released fibers, intercrossed, short or long, in any shape or humidity grade, has been one problem of difficult - technological solution.

The conventional process of pulveri - zation, in which the stuff to be submitted to striving impact and others, as well as those obtained in convert tional grinding, do not result satisfactory when - applied at the grinding of fibrous natural materials , as at best, it is obtained one final procuct still fi- - brous, of low density and without fluidity, in appro - priate for applications where it is required that those materials lose their primitive characteristics and get into powder with a density superior than the original one, as it is required for instance, in several indus- - tries applications as, for example in filtration auxi-

liary, in load material for phenolic resin and others, as thermosetting and thermoplastic resins.

In the new state, obtained throught the solution now proposed, the resultant materials, in - relation to the original products ground by conventio¬ nal methods, became more fluid and dense, since the fi brous estructure was desintegrated in mayor or minor - grade in which the desintegration occurs, causing the mayor or minor density and fluidity of the pulverized - products. In this new dust state the physical proprie¬ ties of the original materials, such as particular sur face and so, its efficiency as agents of adsorption - and fluidity increases in a considerable way.

At the same time, the chemical rea - tivity also increases, since the fibrous bunches are transformed by the proposed solution into laminate es- tructures with a shorter number of molecules forming - its outline, offering so a larger area of contact and so far, more facility and efficiency of reaction. - It is also emphasized as advantage of the obtained material throught the present inventio the parcial or complete change of the fibrous estructu re into laminate pulverizated estructures with density superior than the inicial one, giving to the material - larger handling facility, saving in package and trans¬ port, by the volume occuped for determined might.

Therefore, the present solution has as its object the transformation by humid or dry way o the fibrous natural materials into stuff of changeable - densities, always superior than the original densities

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It was confir eά that when the fibrous natural mate - rials are subordinate to direct pressure, the fibrous bunches suf er irreversible defacement obtaining so a filamentous rupture that gives origin to a very fragile — agglomeration that can be afterwards reduced into pow¬ der with mayor density and fluidity than the conventi nal process.

This direct pressure can be applied individually or over fibrous stratum of any thickness, - in any humidty grade so that the pressured fibers are conductors of pressure transmition and desintegration of the adjoining fibers estructure, against which they are compressed,- next following the change of the fi¬ brous aggregation in one fragile and dense mass that - can be easely pulverizable.

Any physical expedient, as the per¬ cussion or the direct pressure, that provides the ne¬ cessary pressure for desintegrating the- fibrous estruc ture being the pressure effect used or not or being - - followed by any other physical or chemical treatment.- Thus, it is possible to apply simultaneously heat or refrigeration, drying or humidity, solvents or several chemical agents, so that the pulverization operation - that is the object of this proposed solution can be - ne in a continuous or interrupted manner, in a humid - or dry way, with the use of. chemical coadjutants or - not.