Abstract:
A SPINNERET FOR USE IN EXTRUSION OF MAN-MADE FIBERS AND A NOVEL EXTRUDER HEAD EQUIPPED WITH THE SPINNERET. THE SPINNERET IS RECTANGULAR AND ARCUATE ALONG ITS WIDTH WITH THE MARGINAL EDGES OF THE SPINNERET OF SUBSTANTIALLY THE SAME ARCUATE CONDIGUATION AS THE SPINNERET FACE THROUGH
OUT. THE SPINNERET IS ADAPTED TO BE CLAMPED TO A MATING ARCUATE MARGINAL PORTION OF THE EXTRUDER HEAD TO THEREBY ASSURE AN IMPERVIOUS CONNECTION BETWEEN THE HEAD AND THE SPINNERET.
Abstract:
A PROCESS FOR PRODUCING ACRYLONITRILE POLYMERS TO PRODUCE A WHITE POLYMER HAVING EXCELLENT HEAT STABILITY, EXCELLENT MOLECULAR WEIGHT STABILITY, ETC. COMPRISING POLYMERIZING ACRYLONITRILE AT A TEMPERATURE OF FROM 30-70*C. AT A PH BETWEEN 1.8 AND 2.7 IN THE SIMULTANEOUS PRESENCE OF AN ALKALI OR ALALINE EARTH CHLORIDE, SULFUR DIOXIDE OR A COMPOUND CAPABLE OF LIBERATING SULFUR DIOXIDE IN THE POLYMERIZATION MEDIUM, AND AN ALKALI OR ALKALINE EARTH HYPOPHOSPHITE.
Abstract:
A cable or cord of a noncircular cross-section composed of a multiplicity of substantially parallel core yarns covered with a textile sheath, the core yarns being bound together and the sheath being bound to the core yarns by means of an adhesive or binder, such cord or cable being characterized in that the noncircular cross-section has at least one axis of symmetry and that, along the entire length of the cord or cable, at least one reinforcing element is present normal to the axis or one of the axes of symmetry, extending over the entire width of the core. Such cables or cords are produced by cross-section, a sheet of parallel core yarns with a binder, disposing the core yarns in the position that they will occupy in the finished noncircular cross-section cable or cord, and covering the core thus formed of parallel core yarns with a sheath, and thereafter vulcanizing the entire assembly, such process being characterized in that the core yarns provide a noncircular cross-section with at least one axis of symmetry and, at the time of formation of the core, reinforcing elements are introduced between the core yarns, such reinforcing elements also being impregnated with a binder, the elements being disposed along the entire length of the cable normal to the axis of symmetry or to one of the axes of symmetry of the core and extending over the entire width of the core at their point of introduction.
Abstract:
A large size tire particularly adapted for trucks and other heavy vehicles, the tire being one that is reinforced by a radial or standard casing of cords turned in the bead in open plies around a single wire, the tire being one in which the turned-back portion of the cords follows a direction substantially parallel to that of the traction cords opposite thereto, the bead being stiffened above the wire to the level of the rim by a core of rubber having a shore hardness greater than 80, said core being covered with a further rubber core having a shore hardness in the order of 55 to 60. Generally, the length of the turned-back portion of the cords forming the open ply is as slight as possible, the end of the turned-back cords being turned slightly outward. The present invention is directed to an improvement in large size tires for trucks and other heavy vehicles, and more particularly to an improvement in such large size tires for trucks and other heavy vehicles wherein such tires are reinforced by a radial or crossed casing of cords, such cords being turned back in ''''open'''' plies around a single wire surmounted by a hard rubber core. In the past years there have been many improvements made in the construction of tires. Thus, for example, improvements progressively made in the characteristics of the textile materials used in the manufacturing of tires have made it possible to reduce the thickness of the walls of the tires while attaining equal service characteristics. This improvement has itself been supplemented, for example, by the use of larger and larger cords for reinforcements, thereby making it possible to considerably reduce the number of plies necessary in the manufacture of the tires. Such improvements which have been developed in the past are both of considerable value for tires of standard structure (i.e., those having side layers making an angle between them) and for tires with a radial casing since they offer the manufacturers great possibilities in reducing the cost of tires by allowing the use of less raw materials in tire production. However, although such improvements previously developed are of considerable value in such standard tires as described, the same are not satisfactory with respect to truck tires and similar tires subjected to very heavy loads. In this regard, the use of truck tires having thin walls and a single wire shows anomalies in the zone of the bead resulting in a severe limitation of the life of the tire. Thus, since such tires with thin walls are very flexible in the zone of the beads, it is as though a shock wave were destroying the construction of the beads slightly above the level of the edge of the rim where the tire is subjected to heavy loads such as truck tires are subjected to. This effect is even more pronounced at the point at which the turned back plies end. This effect is particularly noticeable in the case of tires for heavy loads reinforced with synthetic textiles, i.e., polyamides, polyesters, etc., rayon with a high tensile strength, or cords of glass. Generally, in tires with textile or glass reinforcement, the plies are turned around a wire, imprisoning a core of rubber locAted above the wire. Such plies come almost in contact with the traction layers by forming ''''closed'''' plies. When used, the destruction of tires used in this manner occurs generally in a zone close to the end of the turned layers in a manner which makes it often visible on the inside traction plies. While various attempts have been made to improve such generally employed structure, such attempts have for the most part been unsuccessful especially with respect to truck tires and tires employed for other high-load uses. Thus, for example, various attempts have been made to increase the size and length of the core located above the wire about which the plies are turned, the folded layers of plies still being brought very close to the traction layers. While in some respects better results have been obtained as the filling cores located above the wire have been progressively increased, in the case of large radial tires with one or two plies on the side the results are insufficient for industrial use contemplated. Accordingly, with respect to truck tires and similar tires subject to heavy loads, any improvements resulting from the increase in the size and length of the core located above the wire have not been satisfactory for the purposes to which the tire is subjected. Accordingly, it has long been the desire of the art of tire production to provide a structure for large size tires, e.g., truck tires and other tires subjected to heavy loads, which would eliminate the inherent deficiencies and disadvantages associated with previously employed structures. This has now been accomplished in accordance with the present invention, whereby a tire can be produced having wearing characteristics and strength characteristics far in excess of those possessed by conventional tires. This is accomplished in accordance with the present invention by providing a tire for trucks and other heavy vehicles wherein such tire is reinforced by a radial or standard casing of cords turned in the bead, in open plies, around a single wire, so that the turned back portion of the cords follows a direction substantially parallel to that of the traction cords opposite thereto, the bead being stiffened above the wire to the level of the rim edge by a core of rubber with a shore hardness greater than 80. By such a structure a tire is produced which has an unexpectedly high-wearing ability and unexpectedly high ability to withstand the stresses associated with heavy loads. It is accordingly a principle object of the present invention to provide a novel large size tire for trucks and similar heavy vehicles, which tire eliminates the inherent deficiencies and disadvantages of prior art structures. It is a further object of the present invention to provide a large size tire for trucks and similar heavy vehicles wherein such tire is reinforced by a radial or crossed casing of cords, the cords being turned back in ''''open'''' plies around a single wire surmounted by a hard rubber core. It is still a further object of the present invention to provide a novel large size tire for trucks and other heavy vehicles, such tire being reinforced by radial or standard casing of cords turned in the bead, in open plies, around a single wire, so that the turned back portion of the cords follows a direction substantially parallel to that of the traction cords opposite thereto. It is still a further object of the present invention to provide such tire wherein the bead is stiffened above the wire to the level of the rim edge by a core of hard rubber with a shore hardness greater than 80, and then, above this level a second rubber core with a shore hardness greater than 80, and a third rubber core with a shore hardness of about 55 to 60.
Abstract:
Refroidisseur adiabatique L’invention concerne un refroidisseur adiabatique (2), comprenant un panneau évaporant (4), un groupe moto-ventilateur (5) pour générer un flux d’air (F1, F2) à travers le panneau évaporant, un réservoir (6) pour stocker de l’eau, un diffuseur d’eau (8), pour humidifier le panneau évaporant, une pompe (10) pour alimenter le diffuseur à partir du réservoir, un stérilisateur d’eau par ultraviolets UV-C (34), disposé entre le réservoir (6) et le diffuseur (8), un filtre particulaire (32) disposé entre la pompe et le stérilisateur. Figure pour l'abrégé : Figure 1
Abstract:
Ce sécheur (S) d'air comprimé à circuit de fluide réfrigérant fermé, comprend un système frigorifique, incluant un circuit de fluide réfrigérant, et un évaporateur comprenant un raccord d'entrée (42) d'air humide et un raccord de sortie (44) d'air sec, définissant entre eux un circuit de passage d'un flux d'air (T1, T2, T3, T4). Le sécheur est un sécheur hybride qui comporte un premier échangeur (4) multitubulaire comprenant, d'une part, au moins un tube de passage formant un premier tronçon (T1) du circuit du flux d'air connecté au raccord d'entrée et, d'autre part, un volume interne formant un dernier tronçon (T4) du circuit de passage du flux d'air en contact avec le tube et qui communique avec le raccord de sortie, un deuxième échangeur (6) à masse thermique (M) traversé par un deuxième tronçon (T2) du circuit de passage du flux d'air en aval du premier tronçon (T1) et par le circuit de fluide réfrigérant et un séparateur air-eau (16) traversé par un avant dernier tronçon (T3) du circuit de passage du flux d'air en aval du deuxième tronçon (T2) et en amont du dernier tronçon (T4) formé dans le premier échangeur.
Abstract:
1318024 Polyacrylonitrile filaments CTACOMPAGNIE INDUSTRIELLE DE TEXTILES ARTIFICIELS ET SYNTHETIQUES 26 April 1971 [24 April 1970] 11420/71 Heading B5B [Also in Division D1] A process for obtaining fibres of acrylonitrile polymers (containing more than 50% by weight of acrylonitrile units) possessing an inherent crimp comprises wet spinning a solution of the acrylonitrile polymer in an organic solvent into a coagulating bath consisting of a mixture of a solvent for the polymer, isopropanol and 0-2% of water; stretching the filaments so formed in a bath consisting of a solvent for the polymer, isopropanol and 0-2% of water and maintained at a temperature 80-95 C.; cutting the filaments to staple length and washing the fibres or the uncut filaments in an untensioned state; giving the fibres a relaxation treatment, without tension; and drying the fibres without tension. The coagulating bath and the stretching bath preferably are of the same composition and comprise 37-49% by weight of solvent, 61- 49% by weight of isopropanol and up to 2% by weight of water. The coagulating bath is maintained at a temperature below 30 C., preferably between 0 and 20 C. In a preferred embodiment, the filaments are given a preliminary stretch in air at ambient temperature prior to the stretching in the bath and at a lower ratio. The filaments are preferably stretched in the bath to a ratio between 5 and 10. The fibres are given a relaxation treatment by immersion in boiling water. The washing step is preferably performed in counter-current. The crimped, dried fibres may be given a heat treatment without tension to prevent or reduce subsequent shrinkage of the fibres. The organic solvents used include dimethylformamide, dimethylacetamide and dimethylsulphoxide. A definition of term 'acrylonitrile polymer' is given in the Specification and comprises copolymers, mixtures of polymers, and graft copolymers containing more than 50% by weight of acrylonitrile units and less than 50% by weight of units of one or more components from a list thereof.
Abstract:
Ce sécheur (S) d'air comprimé à circuit de fluide réfrigérant fermé, comprend un système frigorifique, incluant un circuit de fluide réfrigérant, et un évaporateur comprenant un raccord d'entrée (42) d'air humide et un raccord de sortie (44) d'air sec, définissant entre eux un circuit de passage d'un flux d'air (T1, T2, T3, T4). Le sécheur est un sécheur hybride qui comporte un premier échangeur (4) multitubulaire comprenant, d'une part, au moins un tube de passage formant un premier tronçon (T1) du circuit du flux d'air connecté au raccord d'entrée et, d'autre part, un volume interne formant un dernier tronçon (T4) du circuit de passage du flux d'air en contact avec le tube et qui communique avec le raccord de sortie, un deuxième échangeur (6) à masse thermique (M) traversé par un deuxième tronçon (T2) du circuit de passage du flux d'air en aval du premier tronçon (T1) et par le circuit de fluide réfrigérant et un séparateur air-eau (16) traversé par un avant dernier tronçon (T3) du circuit de passage du flux d'air en aval du deuxième tronçon (T2) et en amont du dernier tronçon (T4) formé dans le premier échangeur.
Abstract:
1318024 Polyacrylonitrile filaments CTACOMPAGNIE INDUSTRIELLE DE TEXTILES ARTIFICIELS ET SYNTHETIQUES 26 April 1971 [24 April 1970] 11420/71 Heading B5B [Also in Division D1] A process for obtaining fibres of acrylonitrile polymers (containing more than 50% by weight of acrylonitrile units) possessing an inherent crimp comprises wet spinning a solution of the acrylonitrile polymer in an organic solvent into a coagulating bath consisting of a mixture of a solvent for the polymer, isopropanol and 0-2% of water; stretching the filaments so formed in a bath consisting of a solvent for the polymer, isopropanol and 0-2% of water and maintained at a temperature 80-95 C.; cutting the filaments to staple length and washing the fibres or the uncut filaments in an untensioned state; giving the fibres a relaxation treatment, without tension; and drying the fibres without tension. The coagulating bath and the stretching bath preferably are of the same composition and comprise 37-49% by weight of solvent, 61- 49% by weight of isopropanol and up to 2% by weight of water. The coagulating bath is maintained at a temperature below 30 C., preferably between 0 and 20 C. In a preferred embodiment, the filaments are given a preliminary stretch in air at ambient temperature prior to the stretching in the bath and at a lower ratio. The filaments are preferably stretched in the bath to a ratio between 5 and 10. The fibres are given a relaxation treatment by immersion in boiling water. The washing step is preferably performed in counter-current. The crimped, dried fibres may be given a heat treatment without tension to prevent or reduce subsequent shrinkage of the fibres. The organic solvents used include dimethylformamide, dimethylacetamide and dimethylsulphoxide. A definition of term 'acrylonitrile polymer' is given in the Specification and comprises copolymers, mixtures of polymers, and graft copolymers containing more than 50% by weight of acrylonitrile units and less than 50% by weight of units of one or more components from a list thereof.