Process and apparatus for continuous production of length portio

Textiles: manufacturing – Textile product fabrication or treatment – Fiber entangling and interlocking

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28116, A61F 1320

Patent

active

059098848

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a process and an apparatus for the continuous production of length portions from a strand of fluid-absorbing material, the material strand being shaped into a pressed strand by the pressing in of longitudinal grooves at equal circumferential angular spacings by means of press elements drivable in the direction of rotation and simultaneously being transported in the run-through direction as well as subsequently being subdivided into length portions by movable severing elements.
A process and an apparatus of the abovementioned generic type are known from WO 90/07314. According to this document, a multi-layer fibre-material web is folded on itself by means of a plurality of longitudinal folds and is rounded in cross-section. The fibre-material web is thereafter surrounded with a wrapping band, the longitudinal edges of which are sealed. The fibre-material web is subsequently rolled down in steps, at least to the cross-section of an absorption body, in a roller frame by means of a multiplicity of pairs of rollers offset relative to one another in the circumferential direction, and a nonwoven strand is formed. During this reduction in cross-section of the fibre-material web by means of the said pairs of rollers, the nonwoven strand is provided with four longitudinal grooves. The nonwoven strand can be heated during the press-rolling. Length portions corresponding to the absorption bodies are subsequently pre-severed, with the exception of the thin connecting web, by nip-rolling, the ends of these length portions acquiring the form of a hump and a dip respectively, before they are separated completely. Thereafter, a recovery tape can be fastened to the rear end of the absorption body, in order to complete a tampon for feminine hygiene.
Swiss Patent Specification 261,771 discloses a process and a machine for the production of a wrapped tampon consisting of a plurality of angular fluid-absorbing disks, such as cotton wadding, which, stacked centrically, are folded up to form a cup and are pressed into the form of a peg. The disk stack is pressed by means of a ram into a tube which tapers conically at the start and which is mounted fixedly on a table. Provided on the tube circumference is a plurality of longitudinal slots, through each of which projects the circumference of a freely rotatable disk fastened to supporting arms screwed to the table. During the piercing of the cup by the tube, these disks are rotated, and folds or flutes are formed. Subsequently, a heatable cylindrical die, having inner longitudinal ribs which are aligned with the disks and which further indent the flutes, is used. Thereafter, the die has to be removed from the table and placed over a pressing member, the convex surface of which projects, in this position, into the lower end of the die. An axially acting pressing member having a concave surface is then pressed into the upper end of the die, so that, in the course of the dwell time in the die, the peg is provided on the one hand with a finger dip and on the other hand with a round hump.
Swiss Patent Specification 355 255 describes a longitudinally stretchable menstruation tampon with recovery tape as well as a fully automatic process and apparatus for the production of this, the absorbent tampon body being surrounded completely by a wrapping made of moisture-permeable material. The tampon consists of a length portion of a multi-layer wadding web folded in the longitudinal centre, the folding point forming the rear end of the tampon body. The tampon body is surrounded by a hydrophilic gauze, of which the two ends projecting above the folding point serve as recovery means. The gauze is fastened to the end of the tampon by means of a binder. The tampon body is pressed laterally to form a cylindrical tampon in a press die having a stationary and a movable press mould, each semi-cylindrical, and is subsequently provided with a round hump at the front end by axial pressing. The known apparatus contains a curved guide channel for folding the wadding web round to half w

REFERENCES:
patent: 4498218 (1985-02-01), Friese
patent: 5165152 (1992-11-01), Kramer et al.
patent: 5592725 (1997-01-01), Brinker

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