Textiles: fiber preparation – Working – Picking
Patent
1984-10-15
1986-05-20
Rimrodt, Louis K.
Textiles: fiber preparation
Working
Picking
191457, D01G 1100
Patent
active
045891664
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for shortening textile fibers, in particular bleached cotton wastes, consisting in:
(a) continuously moving a pad of fibers between a trough-plate and a feed roller provided with rounded roughnesses which rotates in the feed direction of the fiber pad and compresses it,
(b) pulling the fiber pad beyond the trough-plate by means of a drum provided with cutting roughnesses rotating in the same direction as the feed roller but at a higher tangential speed than said cylinder,
(c) reconstituting the sheet of fibers,
Another object of the invention are the textile fibers obtained by this process and their use in making absorbing pads for disposable articles, in particular for baby diapers.
The dry fabrication of non-woven materials from short fibers is known. However, the implemented methods do not shorten the fibers, merely they open the raw material and distribute the fiber in random or unidirectional manner depending on the desired non-woven material.
The opening or tearing of the fibers consists in moving the fiber pad between a trough-shaped support and a feed roller compressing the pad by 0.08 to 0.12 MPa and then in placing the sheet so formed against a break-up drum with spikes which rotates at a tangential speed up to 30 times that of the feed cylinder.
These known methods are described in particular in the following patents:
French Pat. No. 2,322,941 describes a method of preparation by carding wherein an initial sheet of textile flocks is moved to a trough-shaped table by the feed roller and then is placed against another rotary break-up so as to mechanically untangle, open, and clean said sheet. The fiber tufts so obtained then are pneumatically dispersed in a conduit subject to air circulation and then collected on a perforated surface.
French Pat. No. 2,411,257 describes also an apparatus for opening and cleaning cotton wastes using untangling rollers located in the untangling zone.
French Pat. No. 2,283,247 describes a tearing machine consisting of a trough-shaped plate, a perforated feed roller, a drum with spikes, and a suction duct.
Belgian Pat. No. 662,569 also describes a tearing machine in a particular for treating cotton wastes. The material is driven by a trough-shaped plate provided at its ridge with a specially serrated knife and with a cylinder which is also serrated. A hook drum is mounted parallel to the axis and at the same level.
The purposes of all these methods are merely to improve fiber separation, but do not contribute to shorten them. It must be emphasized that it is even the opposite goal which is pursued since the object is to recover intact fibers once the fiber pad has been opened or torn.
The object of the invention is to offer a process making it possible to shorten the cotton fibers so as to make them useful when manufacturing absorbing pads for paper diaper-making machines which typically are fed with paper pulp.
The parameters and components of the apparatus for implementing the process of the invention are as follows:
the pressure exerted by the feed roller on the fiber pad exceeds 0.25 MPa;
the tangential speed of the drum provided with cutting roughnesses is at least 50 times that of the tangential speed of the feed roller;
in the vertical space between the top of the trough-shaped plate and the drum provided with cutting roughnesses a means is provided making it possible to tear a part or the whole of the textile fibers with a length in excess of 10 mm.
The rounded roughnesses provided on the feed roller may consist of cross-sectionally circular transverse bars or flutings making possible simultaneously, the advance of the pad and its being kept in place, that is, these roughnesses prevent the pad subjected to the action of the cutting-roughnesses drum from slipping.
Preferably the fiber pad consists of fibers from wastes recovered in spinning mills or cotton treatment plants. As a rule cotton wastes consist of fiber lengths far too large to be transformed as such on diaper-making machines. Furthermore, the capability of re-using
REFERENCES:
patent: 4130915 (1978-12-01), Gotchel
patent: 4384708 (1983-05-01), Laplanche
patent: 4484377 (1984-11-01), Morel
Beghin-Say S.A.
Breiner A. W.
Drouzas Nicolas
Rimrodt Louis K.
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