摘要:
The invention relates to a method and device for processing polymeric material by compressing said material at a pressure ranging from 0.7 to 100 MPa and on cooling. A consecutive breakdown is carried out by shearing the material under pressure and on cooling. The shearing is amplitude-modulated with a frequency ranging from 0.3 to 1000 Hz and a modulation index ranging from 0.05 to 1, a maximum value of the shearing stress being ranging from 1 to 50 N/mm . The inventive device comprises a body (1), a pressure spiral conveyor (5) and a rotor (8) and is provided with a shearing stress modulator (7,15) which is arranged either between the pressure spiral conveyor (5) and the rotor (8), and/or on the inner surface of the body (1). The shearing stress modulator (7) is arranged between the pressure spiral conveyor (5) and the rotor (8) in such a way that it is rotatable and embodied in the form of an elliptic cylinder or a straight polygonal prism, or a rotation body provided with grooves which are embodied on the surface thereof. The shearing stress modulator (15) is arranged on the inner surface of the body (1) and has the form of an annular boss which is provided with longitudinal and inclined grooves embodied on the surface thereof. In the other embodiment, the device is provided with a two-element shearing stress modulator which is arranged in a grinding zone (6). The first element (16) of the shearing stress modulator is arranged between the pressure spiral conveyor (5) and a rotor (8), and the second element (17) of the shearing stress modulator is arranged on the inner surface of the body (1).
摘要:
A method of making polymeric particulates wherein polymeric scrap material, virgin polymeric material and mixtures thereof are supplied to intermeshing extruder screws which are rotated to transport the polymeric material along their length and subject the polymeric material to solid state shear pulverization and in-situ polymer compatibilisation, if two or more incompatible polymers are present. Uniform pulverized particulates are produced without addition of a compatibilizing agent. The pulverized particulates are directly melt processable (as powder feedstock) and surprisingly yield a substantially homogeneous light color product. The pulverized particulates also can be more intimately mixed than mixtures which are provided by only melt mixing, and can be melt processed without a significant delay in achieving phase inversion. The pulverized particulates also provide a stable microstructure.
摘要:
Apparatus for reducing to particles tread portions and beaded side wall portions of vehicle tires (19), particularly extra large vehicle tires (19), or for preparing such vehicle tires (19) for recapping, comprises a tire holder assembly (10), having a paired set of dual jacks (16) carried by opposite ends, respectively, or elongate, rigid, tire clamping frames (14), and a rotary, cutter blade assembly (13) made up of chisel type offset from one another to provide a helically oriented series of such cutting blades (13). An optional but important feature of the invention is the progressive cutting of the tire (19) in a cryogenic atmosphere which freezes exposed surfaces of the tire, and the mounting of a group of separate, residual, beaded side wall portions (19-1) of sequentially cut tires (19) in the tire holder assembly (13) of the same apertures for cutting such side wall portions (19-1) down to the heavily reinforced beads (51) thereof.
摘要:
Plastic refuse of different chemical compositions is salvaged by loading it, crushed, washed and dried, into a homomicronizing device (1) comprising a cylindrical chamber (2) housing a high-speed rotor (6) with suitably oriented blades (32). The crushed material is rotated by the rotor and, after being crushed mechanically into smaller and smaller pieces, is heated to a gel by the friction between itself, the blades (32) and the wall of the chamber (2), which gelling is indicated by a sharp increase in the input of the rotor. At this point, the gel, which is fluid and fully homogenized, is unloaded from the chamber, extruded and converted into granules suitable for producing finished products using standart injection molding and extrusion techniques.
摘要:
The application relates to a recycling method for fiber-reinforced plastics materials comprising the steps of extruding a mixture formed by fragments of the material and an artificial resin in order to obtain a product in a solidified form, e.g. in granules, and subsequently to be able to feed producing machines, e.g. moulding machines with said product. Further it claims a granule (10) comprising an outer coating (20) of synthetic resin having at least one fragment (30) of fiberglass or fiber embedded in synthetic resin inside of it. Further the application claims an industrial plant for implementing the proposed method of recycling and a method for reprocessing the produced granules.
摘要:
저 인장강도를 가지는 폐타이어 고무분말 제조장치가 개시된다. 본 발명의 실시 예에 따른 저 인장강도를 가지는 폐타이어 고무분말 제조장치는, 폐타이어를 분쇄하고 철심을 제거한 고무칩으로부터 재활용 가능한 고무분말을 제조하는 장치에 있어서, 원통형의 고정드럼과 상기 고정드럼 내부에서 회전하고 외주면에 복수개의 압착날이 각각 나선형으로 경사지게 형성된 회전압착드럼으로 이루어져, 일정한 크기로 절단되어 투입된 고무칩을 압착, 변형시켜 인장강도를 감소시키는 인장강도 변형기; 상기 인장강도 변형기에서 배출된 고무칩을 냉각시키면서 이송하는 냉각이송기; 및 상기 냉각이송기에서 이송된 냉각된 고무칩을 고무분말로 분쇄하는 미세분쇄기;를 포함하는 것을 특징으로 한다.
摘要:
Résines et des composites thermodurs les comprenant, ces matériaux pouvant être façonnés à chaud. Ces compositions résultant de la mise en contact d'au moins un précurseur de résine thermodurcissable, ce précurseur de résine thermodurcissable comportant des fonctions hydroxyle et/ou des groupements époxy, et éventuellement des fonctions ester, avec au moins un durcisseur choisi parmi les anhydrides d'acide, en présence d'au moins un catalyseur de transestérification dont la quantité totale en mole est entre 5 et 25% de la quantité molaire totale d'hydroxyle et d'époxy contenus dans le précurseur de résine thermodurcissable. Procédé de fabrication de ces matériaux, procédé de transformation et procédé de recyclage de ces matériaux. Nouvelles formes solides de résines et de composites thermodurcis qui peuvent être utilisées dans la mise en œuvre de ces procédés.
摘要:
Methods of producing particles of fiber and resin from fiber-resin composite materials are disclosed. The particles may be combined with a resin system and optionally combined with fillers, binders or reinforcements to produce new cured solid composite products.
摘要:
A method and system are presented for grinding and reclaiming of polymer material such as a rubber. The apparatus comprising a stator (4) and a rotor (2) in near face-to-face relationship with each other forming an operating zone for rubber grinding and reclaiming therebetween. The stator (4) has a substantially flat smooth face surface and the rotor (2) has a concave face surface with a depth gradually decreased from a center to a periphery thereof. The rotor further comprising at least one curved protrusion (30) with a radius of curvature gradually increased from the center to the periphery of the rotor.