A process for the production of spunbonded nonwoven (1) and a device for this purpose are shown, wherein a spinning mass (2) is extruded through a plurality of nozzle holes of at least one spinneret (3) to form filaments (4) and the filaments (4) are charged with a drawing air stream to be drawn in an extrusion direction, wherein the filaments (4) are deposited on a perforated conveying device (9) to form a spunbonded nonwoven (1) and wherein the spunbonded nonwoven (1) is subsequently subjected to at least one washing (10) and one drying (12) by means of hot air (15), with, in each case, one exhaust air stream (18, 19) being discharged during the drawing and washing (10). So as to be able to reduce the energy consumption in the process during the drying of the spunbonded nonwoven without decreasing the product quality, it is suggested that the hot air (15) for drying (12) is generated at least partially by preheating an air stream (16) by means of one of the exhaust air streams (18, 19) from the drawing and washing (10).

The present disclosure relates generally to carbon fibers having high tensile strength and modulus of elasticity, as well as a process for the manufacture of such carbon fiber. The process comprises spinning a polymer/solvent solution into a solvent/water bath in the range of 78%-85% solvent, thereby producing a dense fiber structure, and subsequently carbonizing the polymer precursor fiber at a lower than typical carbonization temperature to form carbon fibers.

The present disclosure relates generally to carbon fibers having high tensile strength and modulus of elasticity, as well as a process for the manufacture of such carbon fiber. The process comprises spinning a polymer/solvent solution into a solvent/water bath in the range of 78%-85% solvent, thereby producing a dense fiber structure, and subsequently carbonizing the polymer precursor fiber at a lower than typical carbonization temperature to form carbon fibers.

A process for the manufacture of a tread band for pneumatic tyres, wherein the blocks thereof comprise different rubber portions characterized by a different hysteresis loss. The process comprises a shredding step, wherein from a first and from a second rubber tread compound a plurality of fragments is manufactured with dimensions of between 6 and 30 mesh; a mixing step, wherein the fragments from the first and second compound are mixed together in order to obtain a mixture wherein said fragments are distributed in a random manner and retain their chemical/physical individuality; and an extrusion step, wherein the mixture from the preceding step is extruded for the manufacture of the tread band. The first and second compounds have different dynamic properties in terms of: dynamic modulus at 30° C., tand at 0° C., tand at 30° C. and tand at 60° C. The fragments retain a chemical/physical individuality both within the mixture formed during the mixing step and within the tread band formed during the extrusion step.

A melt blowing nozzle apparatus for producing a plurality of fiber strands from a polymer melt has at least one melt inlet and at least one process air inlet. The apparatus further has a nozzle plate having a plurality of small tubes, each having a capillary bore for extruding the fiber strands, and an extrusion plate arranged underneath the nozzle plate, which extrusion plate has a plurality of extrusion openings for blowing out the fiber strands, corresponding to the small tubes. Each extrusion opening encloses one of the small tubes with an air gap. To ensure mountability in case of a large number of small tubes, a channel system of a common distribution device is provided for connection and distribution of the melt inlet to the capillaries of the small tubes and for connection and distribution of the process air inlet to the extrusion openings of the extrusion plate.

A melt blowing nozzle apparatus for producing a plurality of fiber strands from a polymer melt has at least one melt inlet and at least one process air inlet. The apparatus further has a nozzle plate having a plurality of small tubes, each having a capillary bore for extruding the fiber strands, and an extrusion plate arranged underneath the nozzle plate, which extrusion plate has a plurality of extrusion openings for blowing out the fiber strands, corresponding to the small tubes. Each extrusion opening encloses one of the small tubes with an air gap. To ensure mountability in case of a large number of small tubes, a channel system of a common distribution device is provided for connection and distribution of the melt inlet to the capillaries of the small tubes and for connection and distribution of the process air inlet to the extrusion openings of the extrusion plate.

A three-dimensional molding apparatus is provided and includes a reservoir portion, a nozzle portion, a liquid-sending unit, and a temperature control unit that correspond to each of the two or more different types of materials, a molding stage, a relative movement mechanism for moving the stage and the nozzle portions, and a control computer. By using this apparatus, industrial additive manufacturing with two or more different types of materials can be realized with high precision, and high-definition molded products in which different types of materials are arbitrarily combined can be produced.

An underwater granulation system has a water box, a perforated plate with multiple through-openings for feeding a polymer melt into the water box, and a cutting plate support which is arranged in the water box so as to be driven in rotation about an axis of rotation (X) in a cutting direction. The cutting plate support has multiple cutting plates which face the perforated plate and are adapted to form granules by shearing particles from the polymer melt entering through the perforated plate. The water box is connected to a water supply for heat evacuation and for evacuating the separated particles from the water box. The water box also has a hollow cylindrical portion relative to the axis of rotation (X), in which multiple water inlets distributed over the circumference and multiple water outlets distributed over the circumference are arranged.

A method for recycling powdered paint waste is provided in which, the powdered paint waste is being treated with the aid of a reactant in such a way that its adhesion to surfaces and especially to metal surfaces is reduced or eliminated. The treatment of the powdered paint waste allows the powdered paint waste to be additionally processed under the influence of heat and to use it as a starting material in various recycling processes or in other processes.

A method for recycling powdered paint waste is provided in which, the powdered paint waste is being treated with the aid of a reactant in such a way that its adhesion to surfaces and especially to metal surfaces is reduced or eliminated. The treatment of the powdered paint waste allows the powdered paint waste to be additionally processed under the influence of heat and to use it as a starting material in various recycling processes or in other processes.