摘要:
In a process for building tyres for vehicle wheels, the building of a belt structure of a crown structure comprises: sequentially depositing, on a first conveyor belt (11a), a predetermined number of strip-like elements; sequentially depositing, on a second conveyor belt (lib), a predetermined number of strip-like elements; transferring the strip-like elements from the first conveyor belt (11a) to a forming support (100) for building a first belt layer on the forming support (100); moving the forming support (100) at the second conveyor belt (11b); transferring the strip¬ like elements from the second conveyor belt (lib) to the forming support (100) for building a second belt layer on the forming support (100) in a radially outer position with respect to the first belt layer. Transferring the strip- like elements from the first conveyor belt to the forming support (100) is at least partially carried out simultaneously with at least part of depositing the strip- like elements on the second conveyor belt (11b).
摘要:
A method for controlling the thickness of a continuous elongated element made of elastomeric material, applied according to coils wound on a forming support, comprises: advancing a head end (54) of the continuous elongated element (21) towards the forming support (11, 16); subjecting - during the advancement - the continuous elongated element (21) to a first stretching with a first stretch coefficient (K 1 ) before applying on the forming support (11, 16); subjecting - during the advancement - the continuous elongated element (21) to a second stretching with a second stretch coefficient (K 2 ) during the application on the forming support (11, 16). During the first stretching, a span (55) of the continuous elongated element (21) adjacent to the head end (54) is stretched with a supplementary stretch coefficient (K' 1 ) greater than the first stretch coefficient (K 1 ), in a manner so as to confer, also to the span (55) adjacent to the head end (54), a stretch and a section similar or substantially equivalent to those of the rest of the continuous elongated element (21) .
摘要:
A method for controlling the thickness of a continuous elongated element made of elastomeric material, applied according to coils wound on a forming support, includes: advancing a head end of the continuous elongated element toward the forming support; subjecting, during the advancement, the continuous elongated element to a first stretching with a first stretch coefficient before applying on the forming support; and subjecting, during the advancement, the continuous elongated element to a second stretching with a second stretch coefficient during the application on the forming support. During the first stretching, a span of the continuous elongated element adjacent to the head end is stretched with a supplementary stretch coefficient greater than the first stretch coefficient, in a manner so as to confer, also to the span adjacent to the head end, a stretch and a section similar or substantially equivalent to those of the rest of the continuous elongated element.
摘要:
A process for continuously producing an elastomeric composition is described comprising the step of dosing into at least one extruder (5, 20) at least one ingredient by means of a dosing device (3, 8a, 8b, 10a, 10b, 14, 24), wherein the dosing step is regulated on the basis of : i) actual weight values of the at least one ingredient measured at dosing instants of an evaluation time period of predetermined duration preceding a given dosing instant; ii) expected weight values of the at least one ingredient calculated for corresponding dosing instants of the evaluation time period of predetermined duration preceding the dosing instant; and iii) expected weight values of the at least one ingredient calculated for a prediction time period of predetermined duration following the dosing instant; so as to minimize: - a prediction weight error between actual weight values measured during the prediction time period and the expected weight values calculated for the prediction time period, and - a model weight error between actual weight values measured during the prediction time period and theoretical weight values of the at least one ingredient corresponding to the target weight loss of the at least one ingredient.
摘要:
In the manufacturing of a semi - finished product (100) made of elastomeric material, a method is carried out for controlling the heating of an extrusion device (1) comprising multiple structural units (10-40) having respective different working temperatures (T1-T4)and thermal inertias (11-14). The method comprises: a) setting, for all of the above-mentioned units (10-40, a heating temperature to a value equal or close to the working temperature of the unit which has the lowest working temperature; b) simultaneously heating all of the above-mentioned units (10-40); c) when said unit is approaching or has reached said heating temperature, setting for the other units a new heating temperature to a value equal or close to that of the working temperature of the unit whose working temperature is closest to said heating temperature; d) iteratively repeating the operations mentioned in b) and c), until all of the above- mentioned units (10-40)have reached the respective working temperature (T1-T4).
摘要:
A method of manufacturing tyres for vehicle wheels, said method comprising the following steps: a) building a carcass structure (2); b) building a belt structure (3); c) building a tread band (4); wherein at least one of the carcass structure (2), belt structure (3) and tread band (4) comprises a tubular structure (10a, 10b) of elastomeric material; d) shaping said carcass structure (2) into a toroidal conformation to associate it with at least said belt structure (3) by exerting a radial deformation force directed from the inside to the outside of said carcass structure (2); said method comprising the following step, during execution of at least one of steps a), b) and c) : e) building said tubular structure (10a, 10b) in such a manner that the profile thereof, along its circumferential extension, has such a starting thickness that the deformed tubular structure (10b) following step d) has a substantially uniform thickness.
摘要:
A process for continuously producing an elastomeric composition is described comprising the step of dosing into at least one extruder (5, 20) at least one ingredient by means of a dosing device (3, 8a, 8b, 10a, 10b, 14, 24), wherein the dosing step is regulated on the basis of : i) actual weight values of the at least one ingredient measured at dosing instants of an evaluation time period of predetermined duration preceding a given dosing instant; ii) expected weight values of the at least one ingredient calculated for corresponding dosing instants of the evaluation time period of predetermined duration preceding the dosing instant; and iii) expected weight values of the at least one ingredient calculated for a prediction time period of predetermined duration following the dosing instant; so as to minimize: - a prediction weight error between actual weight values measured during the prediction time period and the expected weight values calculated for the prediction time period, and - a model weight error between actual weight values measured during the prediction time period and theoretical weight values of the at least one ingredient corresponding to the target weight loss of the at least one ingredient.