Patent Application
20220266560
The invention relates to a process of aligning filaments in a calender line in which multiple filaments, extending in a warp direction and aligned in the form of a ply, are covered with rubber to make reinforced rubber plies for making tires. The invention also relates to a guiding and maintenance machine using such a process.
In the field of tires, it is required that the tire exhibit various performances (e.g., reduced rolling resistance, better wear resistance, comparable grip in wet and dry conditions, sufficient mileage, etc.). Tires are therefore composed of reinforced rubber plies having different types of rubber compounds with reinforcements of filaments or strips embedded in the rubber material. The nature of the filaments and the nature of the rubber are chosen according to the desired final characteristics. As used herein, the term “filament” includes, without limitation, metallic (such as steel wire, film or cable), synthetic or textile reinforcing elements (or “reinforcements”).
In order to produce reinforced rubber plies, it is known to calender metal reinforcements between two layers of unvulcanized rubber in order to produce reinforced rubber plies. As an example, as shown in
To supply tire blank manufacturing machines (such as calendering machines that form a calendering line), known creel systems support a plurality of spools held in uniform rows, with each spool supporting a filament-wound material (or “filament”). In order to obtain a good quality ply, a plurality of filaments must be guided and maintained as they are fed to the rubber products. Each of the filaments is therefore moved to known guide and application rollers for positioning in a ply in a state where all filaments are aligned at predetermined intervals (as shown in
In addition, there are calendering machines for applying an elastomer to a known substrate (e.g., metal and/or fabric substrate). Such a machine proposed by Rodolfo Comerio Srl includes a group of cylinders with a first working cylinder (“first cylinder”) and a second working cylinder (“second cylinder”) that are located on each side of the substrate and define a gap for the substrate. In order to adjust the gap, a first adjustment device acts on the first cylinder to move it along an adjustment direction away from, or towards, the second cylinder. The group of cylinders also includes at least a first counter cylinder for calendering and spreading an elastomer on the surface of the first working cylinder. The first counter cylinder arranged adjacent to the first working cylinder rotates in the opposite direction to the first working cylinder. In order to adjust a gap existing between the first counter-cylinder and the first working cylinder, a second adjusting device acts on the first counter-cylinder to impart a thrust force of the first counter-cylinder in a predetermined direction toward the first working cylinder. The first and second working cylinders exert a thrust on the substrate to apply the elastomer to the substrate and to couple the elastomer to the substrate. Such a machine also includes a hydrostatic support for the first working cylinder to slide in the direction of adjustment and to hydrostatically support the thrust exerted by the first counter-cylinder (see publication EP3345736B1).
None of the proposed solutions discloses the guiding and maintenance of the filaments by means of a preparation comb(s) mounted on the guide roller(s), ensuring a quick placement of the filaments in the grooves of the guide rollers (i.e., a filament “anti-jump” maintenance function). Furthermore, none of the proposed solutions discloses one or more mobile guide rollers that, by moving towards a corresponding application roller, permits the formation of an anti jumping box of filaments by capture (or “imprisonment”) and to maintain the positioning at the desired pitch whatever the traction. Thus, the disclosed invention combines the benefits of both functions for the purpose of facilitating the preparation and controlling the placement of filaments before and during a calendering process.
The invention relates to a guiding and maintenance machine for positioning filaments at a predetermined pitch in a calendering cycle that carries out the manufacture of plies using the filaments. The guiding and maintenance machine includes a group of cylinders having a group of guide rollers with an upper guide roller and a lower guide roller, each guide roller having a predetermined diameter and a longitudinal axis about which the respective guide roller rotates, each guide roller also having a plurality of circumferential grooves defined on a respective circumferential surface in correspondence with the number of filaments to be aligned during a guiding and holding process. The cylinder group also includes an application roller having a predetermined diameter and a longitudinal axis about which the application roller rotates, the application roller having a plurality of circumferential grooves defined on a circumferential surface of the application roller in correspondence with the cumulative number of grooves of the guide rollers. The guiding and maintenance machine includes at least one preparation comb in correspondence with each guide roller, each preparation comb having a support with a predetermined length between two opposite ends and a predetermined width between a front surface and a top surface of which a plurality of teeth extend. The teeth have a predetermined uniform height and are parallel to each other along the length of the support. The teeth of a preparation comb attributed to the upper guide roller are positioned at a predetermined pitch in correspondence with the grooves of the upper guide roller. The teeth of a comb attributed to the lower guide roller are positioned at a predetermined pitch in correspondence with the grooves of the lower guide roller. Each guide roller is movable relative to the application roller between an open position, in which the filaments are fed to the guide rollers, and a closed position, in which each guide roller approaches the application roller to capture the filaments between the respective grooves of the guide rollers and the grooves of the application roller, so that the preparation combs accompany the filaments from a supply creel to the guide rollers at a predetermined pitch positioning outside of the guide rollers.
In certain embodiments, the guiding and maintenance machine includes a pair of preparation combs attributed to each of the upper and lower guide rollers. Each pair of preparation combs includes at least one mobile comb and at least one fixed comb mounted in alignment with a corresponding preparation zone so that the teeth of the mobile comb and the teeth of the fixed comb are aligned to allow the passage of the filaments through the mobile and fixed combs.
In some embodiments, each mobile comb is positioned between the corresponding preparation zone and a corresponding guide roller in such a way that the pitches between the teeth of each comb are aligned with the corresponding guide roller grooves.
In certain embodiments, the mobile combs are installed either tangentially or perpendicularly to a corresponding circumferential surface.
In certain embodiments, the pitch of the teeth is at least 0.7 mm and at most 1.4 mm. The invention also relates to a calendering system for manufacturing reinforced rubber plies, the calendering system including:
the disclosed guiding and maintenance machine;
at least one supply creel that supports a plurality of spools held in uniform rows, each spool supporting a filament, each filament being fed from the spools to an outlet of the supply creel to the guiding and maintenance machine; and
a calendering machine having a calender roll on which at least one rubber layer is arranged to form a ply or plies with aligned and mutually parallel filaments with a predetermined density.
In certain embodiments of the system, the calendering system further includes a preparation zone associated with a corresponding supply creel, one preparation zone having a pair of preparation combs attributed to the upper guide roller and one preparation zone having a pair of preparation combs attributed to the lower guide roller, each pair of preparation combs including at least one mobile comb and at least one fixed comb mounted in alignment at a corresponding preparation zone such that the teeth of the mobile comb and the teeth of the fixed comb are aligned to allow the passage of the corresponding filaments through the pair of preparation combs from a respective outlet of the supply creel to the guiding and maintenance machine.
The invention also relates to a guiding and maintenance method performed by the disclosed calendering system during a calendering cycle, the method including the following steps:
a step of feeding the filaments toward one or more combs attributed to the guide rollers from the outlet of the supply creel to the guiding and maintenance machine;
a step of conveying the filaments arriving from the supply creel to the corresponding guide rollers of the machine;
a step of inserting the filaments into the corresponding grooves of the guide rollers of the guiding and maintenance machine; and
a step of moving the guide rollers from the open position to the closed position to capture the filaments between the guide rollers and the application roller so that the respective filaments enter the corresponding grooves of the application roller while maintaining the aligned state of the filaments.
In certain embodiments of carrying out the process, the step of conveying the filaments includes the following steps:
a step of concomitantly pulling a mobile comb attributed to the upper guide roller and filaments toward the upper guide roller; and
a step of concomitantly pulling of a mobile comb attributed to the lower guide roller and filaments toward the lower guide roller.
In certain embodiments of the process, the pulling of each mobile comb is carried out in such a way that the pitches between the teeth of each mobile comb are aligned with the corresponding grooves of the guide rollers.
In certain embodiments of the process, the pulling of the mobile combs is carried out in such a way that the mobile combs are installed either tangentially or perpendicularly relative to the circumferential surfaces of the guide rollers.
In certain embodiments of the process, the process further includes a step of transferring the filaments toward the grooves of the application roller in a state that is aligned and set with the grooves of the guide rollers.
In certain embodiments of the process, the process also includes a step of maintaining the mobile combs in an installed position.
In certain embodiments of the process, the process further includes a step of returning a mobile comb to the corresponding preparation zone after the end of a calendering cycle.
The invention also relates to a calendering cycle, the calendering cycle further including a step of feeding the calender cylinder of the calendering machine with filaments aligned by the guiding and maintenance machine.
The invention also relates to a calendering cycle including the process of the invention, the calendering cycle further including a step of conveying the filaments that are aligned by the guiding and maintenance machine to the calender cylinder of the calendering machine.
Further aspects of the invention will become evident from the following detailed description.
The nature and the various advantages of the invention will become more evident upon reading the following detailed description, together with the attached drawings, in which the same reference numbers designate identical parts everywhere, and in which:
Referring now to the figures, in which the same numbers identify the same elements, an embodiment of a guiding and maintenance machine (or “machine”) 100 of the invention is represented that incorporates one or more preparation combs 200 supplied with the machine (an embodiment of a preparation comb 200 is shown in
The plies coming out of the machine 100 include different types of rubber compounds with reinforcing filaments embedded in the rubber material. Examples of suitable filaments include, without limitation, micro 10 alloy carbon steel wires (0.9% carbon and 0.2% chromium) of the UHT type having a tensile strength (Rm) of approximately 3650 MPa (breaking force of 258 N) and a total elongation at break (At) of 2.3% (Rm and At being measured under tension in accordance with ISO 15 6892 of 1984). Each filament may be any individual steel reinforcement having a cross-sectional dimension (either diameter or thickness) greater than 100 μm. The filaments can have any suitable cross-sectional geometry.
A rubber ply used in a calendering cycle performed by the system 300 includes a conventional rubber-based composition for calendering plies, and its thickness can be adapted to the product in which it will be placed (e.g., in a belt). The rubber layer can be made from a diene elastomer, i.e., any elastomer derived at least in part from diene monomer. This diene elastomer can be selected from polybutadienes (BR), natural rubber (NR), synthetic polyisoprenes (IR), butadiene copolymers, isoprene copolymers and mixtures of these elastomers, such copolymers being selected from butadiene-styrene copolymers (SBR), isoprene-butadiene copolymers (BIR), isoprene-styrene copolymers (SIR), and isoprene-butadiene-styrene copolymers (SBIR). A rubber composition selected for the rubber ply may contain one or more diene elastomers and one or more additives commonly used in rubber matrices for the manufacture of tires. Such fillers include, without limitation, carbon black, silica, coupling agents, anti-aging agents, antioxidants, plasticizers, extender oils, plasticizing resins having a high glass transition temperature (above 30° C.), agents improving the processability of the raw compositions, tackifying resins, anti-reversion agents, methylene acceptors and donors, reinforcing resins, known adhesion promoter systems of the metal salt type and a crosslinking or vulcanization system. A person of skill in the art understands how to adjust the formulation of the rubber composition to obtain the desired properties for a specific tire.
Referring to
The cylinder group of the machine 100 includes a group of guide rollers having an upper guide roller 102 and a lower guide roller 104. Each guide roller 102, 104 has a predetermined diameter and a longitudinal axis about which the respective guide roller rotates. Several circumferential grooves (or “grooves”) 102a are defined on a circumferential surface 102b of the upper guide roller 102 in correspondence with the number of filaments 50 that are to be aligned during a guiding and maintenance process (see
The cylinder group of the machine 100 also includes an application roller 106 having a predetermined diameter and a longitudinal axis around which the application roller rotates. Several circumferential grooves 106a are defined on the circumferential surface 106b of the application roller 106 in correspondence with the cumulative number of grooves of the guide rollers 102, 104 (see
The respective number of grooves 102a, 104a of the upper guide roller 102 and the lower guide roller 104 is adapted to a reduced density compared to a complete density of the grooves 106a of the application roller 106. For example, the grooves of each guide roller can be adapted to half the density of the full density of the grooves of the application roller. It is understood that the number of grooves shown in the figures is for illustrative purposes only and is not limited to the number of grooves shown. The number, density and/or geometry of grooves 102a, 104a, 106a can be adapted to the characteristics of the filaments and/or the properties of the rubber ply.
Referring again to
In the open position, the guide rollers 102, 104 are positioned in relation to the application roller in such a way that the filaments 50, 50′ fed to the machine 100 are easily deposited in the corresponding grooves. As an example, the filaments 50 are deposited in the corresponding grooves 102a of the upper guide roller 102, and the filaments 50′ are deposited in the corresponding grooves 104a of the lower guide roller 104 (of course, the reverse positioning of the filaments 50, 50′ in relation to the guide rollers 102, 104 can be achieved). In the closed position, the upper guide roller 102 and the application roller 106 are positioned in relation to the filaments 50 to permit the transfer of the filaments between the grooves 102a of the upper guide roller 102 and the grooves 106a of the application roller 106, this transfer taking place without loss of alignment of the filaments 50. Similarly, in the closed position, the lower guide roller 104 and the application roller 106 are positioned opposite each other with respect to the filaments 50′ to effect transfer of the filaments between the grooves 104a of the lower guide roller 104 and the grooves 106a of the application roller 106, such transfer being without loss of alignment of the filaments 50′. The opening and closing of the guide roller 102 can be effected by known means (e.g., by a rotary closing device or its commercially known equivalents). The opening and/or closing of the guide rollers 102, 104 can be carried out automatically or manually to ensure the positioning of the filaments 50, 50′ during a guiding and maintenance process of a calendering cycle.
To ensure an aligned introduction of the filaments 50, 50′ to the guide rollers 102, 104, at least one preparation comb (or “comb”) 200 is supplied together with the machine 100 in correspondence with each guide roller. Referring to
The filaments 50, 50′ are fed into each comb 200 from a corresponding supply creel 304, 304′ of the system 300 incorporating the machine 100 and at least one comb 200. Each supply creel 304, 304′ supports a plurality of respective spools 305, 305′ held in uniform rows. Each spool 305 supports a filament 50 and/or a filament 50′. As shown, a plurality of spools 305 is dedicated to filaments 50, and a second plurality of spools 305′ is dedicated to filaments 50′. It is understood that this configuration is an example and is not limited to this configuration. Each supply creel can have n spools (where n equals a number between 1 and n inclusive). In some embodiments, two or more similar supply creels can be installed. Each filament 50, 50′ is conveyed in a known manner by a guide from the spools 305, 305′ to an outlet 304a, 304a′ of the corresponding supply creel. The supply creels 304, 304′ are selected from commercially available supply creels.
In the embodiment of the system 300 of
The pulling of a mobile comb 200′ is effected until reaching a corresponding guide roller 102, 104 where it is installed. In one embodiment of the process, the mobile combs 200′ are installed tangentially to the circumferential surfaces 102b, 104b of the corresponding guide rollers (see
Referring to
The comb 200 attributed to the guide roller 102 has the function of preparing the filaments 50 for positioning at the desired pitch outside of the upper guide roller 102 (“positioning”). The comb 200 attributed to the guide roller 102 also has the function of accompanying the filaments 50 from the supply creel 304 to the upper guide roller 102 in this positioning. In this working position, installed in a fixed position in relation to the grooves 102a of the upper guide roller 102, one or more combs 200 permit guidance of the filaments 50 toward the grooves 102a of the upper guide roller 102 and maintenance of this positioning during the use of the filaments 50. The guiding and maintenance of the filaments 50 by means of the comb (or combs) 200 installed in relation to the upper guide roller 102 ensures a quick and correct positioning of the filaments 50 in the corresponding grooves 102a of the upper guide roller 102.
Referring to
The same opening and closing process is carried out by the lower guide roller 104 in relation to the application roller 106. In the open position, the filaments 50′ are introduced in one-by-one correspondence with the grooves 104a of the lower guide roller 104 during a guiding and maintenance process. In the closed position, the lower guide roller 104 approaches the application roller 106 to capture the filaments 50′ between the respective grooves 104a, 106a of the lower guide roller 102 and the application roller 106. In this working position, the lower guide roller 104 moves sufficiently close to the application roller 106 to form an anti jump cage that prevents the filaments 50′ from coming out of the grooves 106a of the application roller 106. This maintains the positioning of the filaments 50′ at the desired pitch regardless of traction.
Referring again to
When starting a guiding and maintenance process of the invention, the guiding and maintenance process includes a step of feeding the filaments 50, 50′ toward one or more combs 200 attributed to the guide rollers 102, 104. This step includes a step of feeding the filaments 50 from the spools 305 arranged in the supply creel 304 toward the corresponding preparation zone 308 of the system 300 (see arrow A in
The guiding and maintenance process further includes a step of conveying the corresponding filaments 50, 50′ arriving from the supply creels 304, 304′ to the corresponding guide rollers 102, 104 of the machine 100 (see
In an embodiment of the process, each mobile comb 200′ is pulled until it is installed tangentially to the circumferential surfaces 102b, 104b (see
The guiding and maintenance process also includes, as part of the alignment work, a step of placing the filaments 50, 50′ in the corresponding grooves 102a, 104a of the guide rollers 102, 104 of the machine 100 (see
The guiding and maintenance process further includes a step of moving each guide roller 102, 104 from the open position (represented in
In some embodiments, the guiding and maintenance process may also include a step of returning the mobile combs 200′ to the preparation zone 308. During this step, each mobile comb 200′ returns to its initial position next to the corresponding fixed comb 200″ while waiting for the process to be repeated. It is desirable to keep the mobile comb 200′ in the installed position (either tangential or perpendicular).
In embodiments, the guiding and maintenance process of the invention may include a step of returning the mobile combs 200′ to the corresponding preparation zones 308, 308′. This step is carried out after the end of the calendering cycle. During this step, each mobile comb 200′ returns to its initial position next to the corresponding fixed comb 200″while waiting for the start of a calendering cycle.
The guiding and maintenance process may be part of a calendering cycle that further includes a step of conveying the aligned filaments 50, 50′ from the machine 100 to the calender cylinder 302 of the calendering machine (see
At the end of the calendering cycle, the product is finished and can be used in a downstream process (that may be, for example, a palletizing process, a shaping process, and/or another process). The machine 100 incorporating the combs 200 (including the mobile combs 200′ and the fixed combs 200″) ensures planarity in continuous plies of reinforced rubber prior to the final assembly of a tire blank.
A guiding and maintenance process of the invention (and also a cycle of the calendering process of which the process is a part) can be controlled by PLC and can include pre-programming of management information. For example, a process setting can be defined using the properties of the filaments fed to the comb 200 and the machine 100. A process setting can also be defined using the properties of a rubber ply waiting at the calender cylinder 302.
A monitoring system can be set up for all embodiments. At least part of the monitoring system may be provided in a portable device such as a mobile network device (e.g., mobile phone, laptop computer, network-connected portable device(s) (including “augmented reality” and/or “virtual reality” devices, network-connected portable clothing and/or any combination and/or equivalent)).
In certain embodiments of the invention, the machine 100 (and/or a system that incorporates the machine 10, including the system 300) may receive voice commands or other audio data representing, for example, the current state of the guidance and holding process in progress relative to the intended state. The response may be generated in audible, visual, tactile (e.g., using a haptic interface) and/or virtual and/or augmented form.
In an embodiment, the process may include a step of training the machine 100 (or driving a system that incorporates the machine 100, including the system 300) to recognize representative characteristics of the filaments 50, 50′ exiting the supply creel 304 (e.g., diameter and tensile strength values) and to compare them with target values. This step may include a step of training the machine 100 to recognize non-equivalences between the compared values. Each training step includes a classification generated by means of machine learning. This classification may include, without limitation, the parameters of the filament materials used, the parameters of the plies produced, the duration of the calendering cycles and the values expected at the end of a cycle in progress (for example, the value of the space between the aligned filaments in a ply, etc.).
The machine 100 incorporating the comb 200 is suitable for processing a variety of filaments for use in a variety of rubber mixtures without reducing industrial productivity.
The invention is aimed at reducing time and labor during the operation of inserting a multiplicity of filaments into grooves of a guide roller and an application roller in order to align them in a calendering system. The invention enables the rapid and ergonomic positioning of any type of filament at a controlled pitch for use in a calendering cycle that performs the manufacture of plies. The machine 100 and the comb 200 together form a device that prevents any variation of the pitch and any jump between the filaments with an easy and ergonomic preparation in time, with the aim of forming a filament ply of the desired width at the desired density.
The terms “at least one” and “one or more” are used interchangeably. Ranges that are presented as “between a and b” include the values “a” and “b”.
While specific ways of performing the disclosed device have been illustrated and described, it is understood that various changes, additions and modifications may be made without deviating from the spirit and scope of this disclosure. Consequently, no limitations should be imposed on the scope of the invention described except those set forth in the claims annexed hereto.
| Number | Date | Country | Kind |
|---|---|---|---|
| FR1909160 | Aug 2019 | FR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2020/069061 | 7/7/2020 | WO |
