The present application relates to a preparation method for a heat-shrinkable tube. The preparation method comprises the following steps: heating a thermoplastic tube material to a high-elastic state for expansion, and then carrying out cooling molding to obtain a heat-shrinkable tube; and controlling a and b to meet the following condition: ab > 1, and controlling a pushed speed v' and a pulled speed v of the thermoplastic tube material during expansion to meet the following condition: Δs = v'/v - 1 > 1%, such that compared with the thermoplastic tube material, the prepared heat-shrinkable tube is radially expanded and axially contracted, wherein a is the ratio of the inner diameter of the heat-shrinkable tube after expansion to the inner diameter of the thermoplastic tube material before expansion, b is the ratio of the wall thickness of the heat-shrinkable tube after expansion to the wall thickness of the thermoplastic tube material before expansion, and Δs is the difference rate of a pulling speed during expansion.
The present application provides a hollow fiber membrane assembly and a weaving device for the hollow fiber membrane assembly. The hollow fiber membrane assembly comprises a hollow fiber membrane and a plurality of weaving yarns. The hollow fiber membrane comprises a plurality of turn-back segments, and a plurality of parallel segments extending in a weft direction. The ends in the weft direction of parallel segments adjacent in a warp direction are connected by means of one of the turn-back segments, and turn-back segments adjacent in the warp direction are located at two ends of the parallel segments in the weft direction, so that the hollow fiber membrane forms a continuous turn-back body. The plurality of weaving yarns are arranged at intervals in the warp direction, and are woven with the parallel segments.
D04B 23/12 - Métiers à tricoter chaîne rectiligne avec possibilité d'incorporer des trames non tricotées de lisière à lisière
D03D 15/00 - Tissus caractérisés par la matière, la structure ou les propriétés des fibres, des filaments, des filés, des fils ou des autres éléments utilisés en chaîne ou en trame
3.
HOLLOW FIBER MEMBRANE ASSEMBLY, AND HOLLOW FIBER MEMBRANE KINITTED PAD AND KNITTING METHOD THEREFOR
A hollow fiber membrane assembly, a hollow fiber membrane knitted pad and a knitting method therefor. The hollow fiber membrane knitted pad comprises a plurality of hollow fiber membranes (110) and a plurality of knitting threads (120), wherein the plurality of hollow fiber membranes (110) are sequentially arranged at intervals in an extension direction of the knitting threads (120), the hollow fiber membranes (110) are arranged in a bent shape, a bent gap is formed between every two adjacent hollow fiber membranes (110), and the distances between the gaps are the same or different; and the plurality of knitting threads (120) are arranged at intervals in the lengthwise direction of the hollow fiber membranes (110) and are respectively wound around the hollow fiber membranes (110), so that the hollow fiber membranes (110) are knitted together.
A61M 1/18 - Systèmes de dialyseReins artificielsOxygénateurs du sang avec membranes en forme de fibres creuses
B32B 27/02 - Produits stratifiés composés essentiellement de résine synthétique sous forme de fibres ou de filaments
B32B 27/12 - Produits stratifiés composés essentiellement de résine synthétique adjacente à une couche fibreuse ou filamenteuse
B32B 27/28 - Produits stratifiés composés essentiellement de résine synthétique comprenant des copolymères de résines synthétiques non complètement couverts par les sous-groupes suivants
B32B 27/30 - Produits stratifiés composés essentiellement de résine synthétique comprenant une résine vinyliqueProduits stratifiés composés essentiellement de résine synthétique comprenant une résine acrylique
B32B 27/32 - Produits stratifiés composés essentiellement de résine synthétique comprenant des polyoléfines
D04C 1/02 - Tresses ou dentelles, p. ex. dentelles aux fuseauxLeurs procédés de fabrication faites avec des matériaux particuliers
D04C 1/06 - Tresses ou dentelles destinées à des usages particuliers
4.
ARTIFICIAL BLOOD VESSEL AND PREPARATION METHOD THEREFOR
An artificial blood vessel and a method for preparing the same are disclosed. The method includes: weaving warp yarns and weft yarns to form interlaced first and second weaves, both weaves extend along a weft direction and alternate to obtain a composite fabric; and successively corrugating and thermal-setting the composite fabric to obtain the artificial blood vessel. In the composite structure of the artificial blood vessel with the alternating the first and second weaves formed by the warp and weft yarns, a softness degree of the first weave is lower than that of the second weave. As a result, combining stiffness of the first weave with softness of the second weave, this composite structure ensures both low permeability and increased softness of the fabric. Therefore, it is improved to a certain extent over the conventional woven artificial blood vessels and is easier to handle and suture.
D03D 13/00 - Tissus caractérisés par la disposition particulière des fils de chaîne ou de trame, p. ex. avec fils de trame incurvés, avec fils de chaîne discontinus, avec fils de chaîne ou de trame en diagonale
D03D 15/233 - Tissus caractérisés par la matière, la structure ou les propriétés des fibres, des filaments, des filés, des fils ou des autres éléments utilisés en chaîne ou en trame caractérisés par la matière des fibres ou des filaments formant les filés ou les fils à base de protéines, p. ex. laine ou soie
D03D 15/283 - Tissus caractérisés par la matière, la structure ou les propriétés des fibres, des filaments, des filés, des fils ou des autres éléments utilisés en chaîne ou en trame caractérisés par la matière des fibres ou des filaments formant les filés ou les fils à base de polymères synthétiques, p. ex. fibres polyamides ou fibres polyesters
A hollow fiber membrane filament and a preparation method therefor, and an oxygenation membrane obtained by weaving hollow fiber membrane filaments. The preparation method for a hollow fiber membrane filament comprises the following steps: quantitatively feeding reinforcing filaments, a casting solution, and a cavity-forming fluid to a spinneret (10), and performing extrusion to obtain a nascent hollow fiber membrane filament, the spinneret (10) comprising a first channel (11), a second channel (12), and a third channel (13) that are successively provided from inside to outside; feeding the reinforcing filaments to the third channel (13), each reinforcing filament comprising multiple monofilaments, feeding the casting solution to the second channel (12), and feeding the cavity-forming fluid to the first channel (11); enabling the nascent hollow fiber membrane filament to be solidified and formed; immersing the solidified and formed nascent hollow fiber membrane filament in an extraction agent to remove a diluent; and performing heat treatment on the nascent hollow fiber membrane filament in which the diluent is removed.
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