摘要:
A material that includes traceable particles that retain information about the fabrication of the material, which can be used to trace the origin thereof. The material may form gaskets, which are used to seal flanged joints in the food and beverage industry, and compression packings, which are used for sealing near valve stems, pump shafts, and similar machines.
摘要:
A presente invenção se refere a um material compósito que compreende fibra ou manta de carbono feita de poliacrilonitrila (PAN) ou lignina sendo indicado para fabricação de vários artigos como cilindro de pressão de alta resistência. Tal material apresenta diversas vantagens como, por exemplo, proporcionar blindagem melhorada aos artigos que o compreendem. O referido compósito compreende: --uma primeira camada de politetrafluoretileno interna, sobreposta por - uma segunda camada de polietileno de alta densidade, aderida a - uma terceira camada de compósito contendo fibra ou manta de carbono feita de poliacrilonitrila (PAN) ou lignina imersa em resina epóxi curada de uma matriz polimérica epóxi/endurecedor; e - uma quarta camada de compósito externa, compreendendo fibra de aramida impregnada com fluído dilatante e resina epóxi curada de uma matriz polimérica epóxi/endurecedor.
摘要:
A thin wall PTFE tube is formed from an extruded green tube (10). The PTFE tube includes an inner tubular surface and an opposed outer tubular surface defining a tubular wall of a first thickness. The tubular wall is compressed to uniformly reduce the wall-thickness and circumferentially orient the tube. The PTFE tube is positioned over a first elongate roller (22) with the inner tubular surface being in contact therewith. A second roller (24) is positioned against the outer tubular surface of the PTFE tube. The pair of rollers are counter rotated so as to circumferentially compress the tubular (12) wall between the rollers (22, 24). This results in the uniform reduction in the tubular wall (12) from the first thickness to a lesser second thickness and a circumferential orientation otherwise not occuring in an extruded PTFE paste extrusion.
摘要:
A thin wall PTFE tube is formed from an extruded green tube (10). The PTFE tube includes an inner tubular surface and an opposed outer tubular surface defining a tubular wall of a first thickness. The tubular wall is compressed to uniformly reduce the wall-thickness and circumferentially orient the tube. The PTFE tube is positioned over a first elongate roller (22) with the inner tubular surface being in contact therewith. A second roller (24) is positioned against the outer tubular surface of the PTFE tube. The pair of rollers are counter rotated so as to circumferentially compress the tubular (12) wall between the rollers (22, 24). This results in the uniform reduction in the tubular wall (12) from the first thickness to a lesser second thickness and a circumferential orientation otherwise not occuring in an extruded PTFE paste extrusion.
摘要:
The present invention relates to a polytetrafluoroethylene (PTFE) tube, and more particularly to a PTFE tube for a flexible hose. In particular the invention relates to a PTFE tube having a smooth bore for use in the production of a lined hose assembly further comprising hose braids, external hose protection and end fittings. The PTFE tube comprises external roots and peaks, which tube is obtainable from a non-convoluted tube having an original wall thickness W0 and an internal diameter ID by a process in which a region of the tube is thinned to provide external convolutions with a root wall thickness W1 characterised in that the convoluted PFTE tube has an improved resistance, of greater than 7.6 %, to permeation by comparison with the non-convoluted tube, the comparison being made between tubes of (i) equal nominal bore ID; and (ii) equal weight of PTFE per unit length.