Abstract:
The invention relates to a method of producing a pre-impregnated fibrous material comprising a fibrous material consisting of continuous fibres and a thermoplastic polymer matrix produced in a single unidirectional strip or in a plurality of parallel unidirectional strips, the method comprising the following steps: impregnating the material in the form of a roving or a plurality of parallel rovings with the polymer in the form of a powder in a fluid bed (22); and shaping the roving or parallel rovings by calendering by means of a heating calender (51, 52, 53), optionally comprising a plurality of calendering grooves (73) corresponding to the number of strips, and the pressure and/or a spacing between the rollers of the calender being regulated by an auxiliary system.
Abstract:
L'invention concerne un procédé de fabrication d'un matériau fibreux pré- imprégné comprenant un matériau fibreux en fibres continues et une matrice polymère thermoplastique, caractérisé en ce que ledit matériau fibreux pré-imprégné est réalisé en un ruban unique unidirectionnel ou en une pluralité de rubans parallèles unidirectionnels et en ce que ledit procédé comprend les étapes suivantes: i) imprégnation dudit matériau fibreux se présentant sous forme d'une mèche ou de plusieurs mèches parallèles, par ledit polymère thermoplastique se présentant sous forme d'une poudre en lit fluidisé (22), ii) mise en forme de ladite mèche ou desdites mèches parallèles dudit matériau fibreux imprégné selon l'étape i), par calandrage au moyen d'au moins une calandre (51, 52, 53) chauffante sous forme de ruban unique unidirectionnel ou d'une pluralité de rubans parallèles unidirectionnels avec, dans ce dernier cas, ladite calandre chauffante comportant une pluralité de gorges (73) de calandrage, de préférence jusqu'à 200 gorges de calandrage, en conformité avec le nombre desdits rubans et avec une pression et/ou un écartement entre les rouleaux de ladite calandre régulé par un système asservi.
Abstract:
A flexible pipe body and method of producing a flexible pipe body are disclosed. The method includes providing one or more composite filament (302) as a filament bundle (310); applying a braid element (304) around the filament bundle as a braided bundle (310); helically wrapping the braided bundle (310) around a flexible pipe layer (502); and then curing (510) the one or more composite filament (302).
Abstract:
A hollow lineal profile (16) formed from a continuous fiber reinforced ribbon ("CFRT") that contains a plurality of continuous fibers embedded within a first thermoplastic polymer matrix (6). To enhance the tensile strength of the profile, the continuous fibers are aligned within the ribbon in a substantially longitudinal direction (e.g., the direction of pultrusion). In addition to continuous fibers, the hollow profile of the present invention also contains a plurality of long fibers that may be optionally embedded within a second thermoplastic matrix to form a long fiber reinforced thermoplastic ("LFRT") (4). The long fibers may be incorporated into the continuous fiber ribbon or formed as a separate layer of the profile. Regardless, at least a portion of the long fibers are oriented at an angle (e.g., 90°) to the longitudinal direction to provide increased transverse strength to the profile.
Abstract:
The invention relates to a process for building tyres, comprising the step of forming at least one component of the tyre being processed directly on a forming support. The tyre component consists of elastomeric material comprising reinforcing thread elements. The continuous ribbon-like element (S) of elstomeric material (E) comprising reinforcing thread elements (t) is produced (i') by feeding the reinforcing thread elements through openings (33) delimited by circumferential grooves (31) formed in at least one of two guide rollers (30) consisting of idler rollers and facing each other, and (i'') by laying at least one layer of elastomeric material on the reinforcing thread elements.
Abstract:
The present invention provides an economic process which utilizes biodiesel and other high boiling esters containing short alkyl groups to produce liquid fuels from waste polymeric material. The polymeric material is added to a solvent having a predetermined cycle starting solvent volume. An energy source is introduced into the solvent for a predetermined time at a predetermined temperature and pressure to form a product. The energy source is removed and the product is cooled to a predetermined temperature to produce the fuel. The invention also encompasses the fuel formed by the process described.
Abstract:
A process and apparatus for the production of polyacrylonitrile (PAN) polymer fibers from a polyacrylonitrile polymer, wherein a polyacrylonitrile polymer that comprises 90 weight percent or more polyacrylonitrile, optionally mixed with from about 30 to about 50 weight percent, based on the weight of the polymer, of a fugitive plasticizer, is heated, provided to an extruder in liquid form, extruded to form polyacrylonitrile fibers, and the fibers, immediately after the extrusion, are cooled, preferably in an air-cooled manifold, to a temperature of from about 110 to about 135° C. Fibers so produced have increased tensile strength, and thus are useful for more purposes, than typically produced polyacrylonitrile fibers.
Abstract:
The present invention is directed to a method and apparatus (100) for forming a preform (10) from glass fiber strand material. The preform is formed by feeding continuous glass fiber strand material into a mold (20) to form a continuous wool product in the mold; feeding a binder into the mold; compressing the mold to compact the wool product to a desired density; and heating the mold to cure the binder, such that a preform is formed having generally the shape of the compressed mold. The mold is then opened and the preform is removed from the mold.
Abstract:
In a process for producing a moulded part, a plate made of thermoplastic material that contains at least one reinforcement layer made of woven, nonwoven, knitted or braided fabrics, inserts or the like embedded in the plastic matrix is heated up to a temperature in the range of the melting point of the thermoplastic material, then shaped by means of a matrix and a male mould. In order to achieve a high, uniform surface quality that requires no subsequent processing with a rational production process, at least one easily deformable membrane that yields to pressure is arranged on at least one side of the plastic plate at least during the shaping process.