Textiles: manufacturing – Textile product fabrication or treatment – Fiber entangling and interlocking
Patent
1993-12-30
1995-12-19
Calvert, John J.
Textiles: manufacturing
Textile product fabrication or treatment
Fiber entangling and interlocking
112420, 156148, D04H 1800
Patent
active
054759048
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method and device for producing composite laps.
In accordance with EP-A-0086996 the aim is to manufacture a composite product which has some mechanical strength while retaining the ability to be formed. In order to achieve this a pasty mass which is soaked with water is placed between two laps, and the two laps are needled through the pasty mass. The two laps are kept apart at all times by a distance which is maintained without accuracy by the pasty mass, which of course has a very variable thickness. This spacing varies during needling. The upper lap which is subjected to needling is considerably deformed by passage of the needles because the pasty mass does not provide it which adequate support.
The thickness of the product obtained is uncertain. Needling through the interleaved constituent makes work difficult for the needles and needling may be impossible with some kinds of interleaved constituent, which would either not permit the needles to pass through or would be damaged by such passage.
DE 2356511 describes a method for assembling together, by means of bridges of needled fibres, two basic laps which are separate from each other with the intention that the laps should then be separated by cutting the fibre bridges in order to yield two identical velvet laps.
The DE-A-2 348 600 discloses a method for manufacturing i.a. heating blankets, wherein a heating wire is introduced during a later step between two assembled basic laps. This method needs the time for introducing the wire in addition to the time for needling. The introduction step which is only mentioned rather than described, appears to be a difficult step.
The purpose of the invention is to allow the simultaneous and continuous assembly of very varied components in order to obtain composite laps whose properties may be very varied depending on their applications.
In accordance with a first aspect of the invention the method for producing a composite lap in which two basic laps are joined together along longitudinal join lines while keeping them, where the joining process occurs, separated from each other by mechanical action between the join lines in the process of formation is characterised in that, as both laps are being joined, an interleaved constituent is guided between the laps thereby to introduce it into the longitudinal spaces which are formed between the longitudinal join lines by said mechanical action.
By keeping the laps separate from each other by mechanical means a perfectly gauged product is obtained. The needles only have to pass through the two laps, without wearing or breaking in the interleaved constituent, and without damaging the latter. The interleaved constituent is simultaneously introduced into the longitudinal spaces created by the mechanical action between the longitudinal join lines which have already been constructed. In this way the interleaved constituent easily finds its place, takes a correct position and does not need to be introduced later, which later step would be time consuming
All in all the invention makes it possible to obtain rapidly a much greater variety of much better gauged products with less wear on the equipment.
In a particular version in which the basic laps are fed from either side of a table with longitudinal ribs, and the basic laps are joined together in such a way that the longitudinal join lines extend between the ribs, it is provided that the interleaved constituent is introduced through longitudinal ducts constructed within the ribs in such a way that the interleaved constituent is located between the basic laps and between the longitudinal join lines as it leaves the ribs. At least one fluid or one powder which bonds to at least one of the basic laps on leaving the ducts can be injected into the ducts in the ribs. This fluid component may be a thermosetting or thermoforming resin, a plaster, a cement, an elastomer or a foam. The interleaved member may also be selected to be a solid member such as cables, electrical conductors, tubes, bundles of filaments a
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patent: 3354020 (1967-11-01), Copeland
patent: 4070217 (1978-01-01), Smith, II et al.
patent: 4498941 (1985-02-01), Goldsworthy
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