Abstract:
Process for manufacturing carbon fibres, of the type comprising a first spinning step of a fibre of PAN precursor and a second oxidation/carbonisation step of said fibre and the plant thereof. The spinning and oxidation/carbonisation steps are performed directly in line and continuously, and hence without any stocking buffer area of a PAN precursor between the two steps. The spinning step is performed at low speed, so that the output speed from the spinning step, downstream of the stretching operations, is a speed falling within the range of the suitable processing speeds in the subsequent oxidation/carbonisation step. Moreover, the spinning step is performed in a modular way on a plurality of spinning modules (M) aligned in one or more rows (A, B), each spinning module (M) having a productivity not above 10% of the overall productivity of the spinning step. In any individual spinning module (M), the fibres downstream of the spinning area follow zig-zag, rectilinear paths through deviation and driving rollers (3-5), both in a horizontal direction and in a vertical direction, along which paths the various spinning treatments are carried out. Finally the fibre tows coming out from each spinning module (M) are arranged side by side, without undergoing transversal deviations with respect to the progress direction thereof, to form a single belt (N) feeding the oxidation/carbonisation step.
Abstract:
A static mixer - of the type which may be introduced in a pipe or associated with the same to form a portion of said pipe, so as to homogeneously blend a fluid flowing in the pipe, without using rotating parts - comprises a cylindrical outer portion (2) and a blending internal structure (3) consisting of multiple elements having planar or curved surfaces, variously arranged and angled to the flow direction. The inner structure (3) and the outer cylindrical portion (2) are radiused and connected to one another, without discontinuities or mechanical joints, by a single sintering process of a plastic or metal powder material with a successive-layer laser.
Abstract:
A closed radial stack for multi-filament spinning comprises means so shaped as to allow to vary the length of the annealing area and/or of the quenching or cooling area, and/or of the filament accompaniment area, and/or of the aspiration area.
Abstract:
A stretching apparatus of fibre tows in a pressurized steam environment comprises an elongated stretching chamber (2) having a generally rectangular section of a low height, within which the tows (T) are treated with saturated or overheated steam at high temperature and pressure and simultaneously undergo a mechanical stretching operation. The stretching chamber (2) is of a width sufficient to house multiple tows (T) mutually flanked in a running plane and is formed within a stretching chest (1) made of aluminium. Said stretching chest (1) is housed in a supporting structure (3-9), having a higher structural rigidity than the stretching chest (1), which comprises a plurality of contact elements (8-9) apt to determine a predefined position of the stretching chest (1)' with respect to a direction perpendicular to the tow running plane (z axis) and to allow a limited mobility of the stretching chest (1) in the other two mutually perpendicular directions which lie in said plane (x and y axes), length and width respectively, sufficient to allow the free thermal expansion of the stretching chest (1) in these two directions while maintaining the same planar notwithstanding the effect of inner stresses apt to cause arching or twisting of the stretching chest (1).
Abstract:
A method for spreading a tow of textile non-braided filaments, preferably chemical or inorganic fibres comprises providing a tow (F) of textile non- braided filaments extending along its own main direction (A) and having a section transverse to the main direction with a predetermined thickness (s) and a predetermined width (W), feeding the tow (F) along a travel path (P) and spreading the tow (F) in order to increase its width (W) and reduce its thickness (s), defining a spread tow (ST1, ST2). The step of spreading the tow (F) comprises immersing the tow (F) in a bath (6) and generating in the bath (6) a sequence of transverse waves crossing the tow (F) transversely to the main direction (A) in order to separate and place the individual filaments side by side, thereby spreading the tow (F), wherein the tow (F) entering the bath (6) and/or the spread tow (ST1, ST2) extracted from the bath (6) is/are unsized.
Abstract:
Transmission joint for a feed member for a fibre material in a laboratory spinning line, comprising a shaft (29) extending along a rotation axis (C) between a first end (29a), coupled to an actuator (23), and a second end (29b) connectable to a feed roller (9) of advancement of fibre material and a containment body (26) extending around the shaft (29), rotatably associated to it, and provided with at least a junction portion (26a) provided with an outer surface having a plurality of coupling areas (27) angularly spaced from each other around the rotation axis (C).
Abstract:
A crimping machine for the treatment of chemical fibers, comprises a conduit (2) extending along an advancement direction (A) between an inlet opening (2a), associable to means for feeding a bundle (F) of fibre material, and an outlet opening (2b), a drive unit (3) arranged along the conduit (2) and comprising a first (4) and a second drive member (5) abutted to each other in correspondence of at least a maximum proximity area (Z) in cui they exert a driving action on the bundle (F) of fibre material, a crimping chamber (10) arranged immediately downstream of the drive unit (3), and configured to receive said bundle (F) of fibre material contributing to the mechanical deformation of the same by peak load. The first drive member (4) and the second drive member (5) are configured so as to define a deviation (D) along the conduit (2) such that the inlet opening (2a) of the conduit (2) has different orientation with respect to said outlet opening (2b), wherein the first member (4), at least at the maximum proximity area (Z), is flexible to move closer or further away from the second member (5) as a function of the thickness of the bundle (F).
Abstract:
Process module for a spinning line of laboratory chemical fibres, comprising a frame (2) extending along a feed direction (A) of the fibres, at least one washing or spinning tank (7) anchored to the frame (2), at least one feed member (8) disposed above and/or in part embedded in the tank (7), and provided with at least one roller (9) rotatable about a rotation axis (C) transverse to the feed direction (A) and support means (10, 11) of said tank (7) and/or of said feed member (8). The frame (2) comprises a longitudinal guide (5) extending along feed direction (A), the support means (10, 11) of said tank (7) and/or of said feed member (8) are provided with at least one shoe (12, 13) slidingly coupled to the guide (5) to allow the movement and positioning of said tank (7) and/or of the feed member (8) along feed direction (A) and equipped with at least one clamping member (14) switchable between a rest configuration in which the shoe (12, 13) is freely slidable along the guide (5), and an operative configuration, preventing the shoe (12, 13) from sliding along the guide (5) by locking its position.
Abstract:
An advancement member of a fibre material for a carbonization line for the production of carbon fibres comprises a support structure (2) extending between two end sections (2a) along a direction of advance (A) of the fibre material, a plurality of feed rollers (4, 5) for the fibre material, each rotatably associated to the support structure (2) by a pair of support elements (8), wherein the support elements (8) of an inlet roller (4a) and/or an outlet roller (4b) comprise a base (8a) integral with said support structure (2), a support ring (8b) coupled with the base (8a) and having at least a through opening for receiving one end of the respective feed roller (4a, 4b) and adjusting means (8c) operatively interposed between the base (8a) and the ring (8b) and configured to move the position of the ring (8b) relative to the base (8a) along a preferably substantially vertical adjustment direction (B).
Abstract:
A stretching apparatus of fibre tows in a pressurized steam environment comprises a plurality of stretching chests (1) and associated supporting structures (3, 4, 6) arranged side by side, at the same level, on a holding frame. The stretching chests (1) are each formed by two opposed metallic half-chests (1b, 1t), delimiting a stretching chamber (2). The stretching chamber (2) has a generally rectangular section of a low height and opens outwards in correspondence of the two transversal edges of the stretching chest (1) through tow entry and exit openings. Inside the stretching chambers (2) the tows are treated with saturated or overheated steam at high temperature and pressure and simultaneously undergo a mechanical stretching operation. The half-chests (1b, 1t) are free to expand in the length direction within surrounding, rigid and pressure-resistant supporting structures (3, 4, 6) which precisely define the position of said stretching half-chests (1b, 1t) in the direction of their height. The half-chests are also mutually movable to cause opening and closing of each single stretching chest (1), independently from the others, for the insertion of the tows being processed, by means of an opening/closing mechanism of the upper half-chest (1t) with respect to the lower half-chest (1b).