The invention relates to a pultrusion method for producing fiber-reinforced plastics, to carrying said method out by computer-assisted simulation and to a suitable underlying thermodynamic model.

A method and a device for fault-free production of individually curved plastic profiles. This is achieved in that the mold and the holding means are moved in opposite directions on the plastic profile, wherein the plastic profile is moved alternately by the mold and the holding means in a production direction with different movement patterns.

The invention relates to a pultrusion method for producing fiber-reinforced plastics, to carrying said method out by computer-assisted simulation and to a suitable underlying thermodynamic model.

A method of producing a reinforcing bar (rebar) includes: arranging one or more thermoplastic polymer fibers (2) in a central portion of a cross-section; arranging a plurality of non-metallic reinforcing fibers (1) on an outer periphery of the thermoplastic polymer fiber(s) (2); heating the thermoplastic polymer fiber(s) (2) to its (their) melting temperature or higher to melt the thermoplastic polymer fiber(s) (2); and cooling the melted thermoplastic polymer to form a bar-shaped polymer layer (91) in the central portion of the cross-section and a fiber-reinforced polymer layer (92) on an outer periphery of the bar-shaped polymer layer (91).

The present invention generally relates to manufacturing of a composite armature, more particularly, to apparatuses for helically winding of a winding roving about a rod when manufacturing a composite armature. There is provided is a helically winding apparatus allowing use of internally unwound roving bobbins instead of sheaves. The helically winding apparatus for a composite armature production line, the apparatus comprising: a disk-shaped creel (1) rotatable about its axis, wherein at least two drums (2) designed to have internally unwound direct roving bobbins mounted therein are mounted on a base of the disk-shaped creel, and each drum is configured to rotate about its axis and to unwind direct roving threads from a bobbin inner side, wherein each drum for placing bobbins of the direct roving is provided with a thread tensioner (3) placed thereon to provide twisting of the direct roving thread relative to its axis when the drum is rotated about its axis to form a twisted roving, wherein the helically winding apparatus further comprises: a cylindrical sleeve (4) positioned in a center of the disk-shaped creel and configured to pass a reinforcement rod through a center of the cylindrical sleeve, wherein the cylindrical sleeve has holes (5) for passing the twisted roving therethrough and helically winding of the twisted roving about the reinforcement rod when the disk-shaped creel is rotated about its axis. A technical effect provided by the claimed invention is an increased produceability of the helically winding apparatus, increased productivity, and a reduced rejection rate.

A system is disclosed for additively manufacturing a composite structure. The system may include a head configured to discharge a continuous reinforcement that is at least partially coated with a matrix, and a housing trailing from the head and configured to at least partially enclose the continuous reinforcement after discharge. The system may also include a heat source disposed at least partially inside the oven, and a support configured to move the head during discharging.

Bio-composite pultruded products (100, 104, 107, 110, 114, 117) either in “I” profile or “Plate” profile of higher cross sectional area where said products consisting essentially natural fibres selected from hemp, jute, sisal and. flex as core impregnated with a resin system comprise of at least one resin, curing system comprising a curing agent and an accelerator, a filler, a thinner, pigment or any other additives; encapsulated between bi-directionally and/or uni-directionally oriented synthetic fabric selected from polyester, carbon, aramid, glass, basalt and mixtures thereof impregnated with said resin system are provided. in another bio-composite pultruded products either of “I” profile or “Plate” profile of higher cross sectional area where said products consisting of plank of short fibers bagasse premixed with the said resin system as core is enclosed between the natural fibers selected from hemp, jute, sisal and flex impregnated with the resin system which is further enclosed between bi-directionally and/or uni-directionally oriented synthetic fabric selected from polyester, carbon, aramid, glass, basalt and mixtures thereof impregnated with the resin system. The system and method for the preparations of said bio-composite pultruded products, are also illustrated herein. These products lead to a significant reduction in weight and reduction in density with higher stiffness and bending strength. The present bio-composite products are encapsulated by fabrics in the peripheral area brings more integrity uniformity of jute materials. This leads to a significant cost reduction in a without sacrificing much tensile strength.

An impregnation section and a method for impregnating fiber rovings with a polymer resin are disclosed. The impregnation section includes an impregnation zone and a gate passage. The impregnation zone is configured to impregnate the plurality of rovings with the resin. The gate passage is in fluid communication with the impregnation zone for flowing the resin therethrough such that the resin impinges on a surface of each of the plurality of rovings facing the gate passage and substantially uniformly coats the plurality of rovings. The method includes impinging a polymer resin onto a surface of a plurality of fiber rovings, and substantially uniformly coating the plurality of rovings with the resin. The method further includes traversing the plurality of coated rovings through an impregnation zone. Each of the plurality of rovings is under a tension of from about 5 Newtons to about 300 Newtons within the impregnation zone.

A print head is disclosed for use with an additive manufacturing system. The print head may include a nozzle tip, a first matrix source configured to selectively supply a structural matrix to the nozzle tip, and a second matrix source configured to selectively supply a temporary support matrix to the nozzle tip. The print head may also include a reinforcement supply configured to supply a continuous reinforcement through the nozzle tip only when the first matrix source is supplying the structural matrix to the nozzle tip.

Various embodiments related to three dimensional printers, and reinforced filaments, and their methods of use are described. In one embodiment, a void free reinforced filament is fed into an extrusion nozzle. The reinforced filament includes a core, which may be continuous or semi-continuous, and a matrix material surrounding the core. The reinforced filament is heated to a temperature greater than a melting temperature of the matrix material and less than a melting temperature of the core prior to extruding the filament from the extrusion nozzle.