44results about How to "High knot strength" patented technology

Resorbable multifilament yarns and monofilament fibers including poly-4-hydroxybutyrate and copolymers thereof with high tenacity or high tensile strength have been developed. The yarns and fibers are produced by cold drawing the multifilament yarns and monofilament fibers before hot drawing the yarns and fibers under tension at temperatures above the melt temperature of the polymer or copolymer. These yarns and fibers have prolonged strength retention in vivo making them suitable for soft tissue repairs where high strength and strength retention is required. The multifilament yarns have tenacities higher than 8.1 grams per denier, and in vivo, retain at least 65% of their initial strength at 2 weeks. The monofilament fibers retain at least 50% of their initial strength at 4 weeks in vivo. The monofilament fibers have tensile strengths higher than 500 MPa. These yarns and fibers may be used to make various medical devices for various applications, including mesh sutures.

Provided are carbon fiber bundles which have high knot strength even if the single fiber fineness is large, and which have excellent handling properties and processability. The carbon fiber bundles have a single fiber fineness of 0.8-2.5 dtex, knot strength of 298 N / mm2 or greater. This method of producing carbon fibers having knot strength of 298 N / mm2 or greater involves a heat treatment step for heat treating, for 50-150 minutes, specific polyacrylonitrile-based precursor fiber bundles described in the description in an oxidizing atmosphere rising in temperature in the temperature range of 220-300° C.

The invention relates to the technical field of hydraulic and hydroelectric engineering, and aims to provide a novel grading lifting type water retaining dam which is stable in supporting and does not affect lifting of a gate. According to the technical scheme adopted by the novel grading lifting type water retaining dam, the bulkhead gate is composed of a front steel plate and a rear steel plate, and the front steel plate and the rear steel plate are integrally connected through two side plates. The top of the front steel plate is provided with a plurality of rod recovery openings, the rear steel plate are provided with a plurality of rod penetrating grooves, and the rod recovery openings correspond to the rod penetrating grooves one by one. Each rod penetrating groove is composed of two parallel and vertical strip-shaped groove bodies which extend from the middle of the rear steel plate to the edge of the top of the rear steel plate. A supporting assembly is arranged at each group composed of one rod recovery opening and one rod penetrating groove correspondingly, and comprises supporting rods and hinge supports fixed to a downstream bed. The novel grading lifting type water retaining dam is stable in supporting and does not affect lifting of the gate.

An absorptive medical suture with high strength, toughness, biocompatibility and absorptivity, and abvious body temp memory effect is prepared from CO2 copolymer through fusing, mixing with maleic acid anhydride or acetic acid anhydride, granulating, fusing, mixing with polylactic acid or polyhydroxy butyrate, extruding for granulating, melt spinning and drafting in water bath.

The invention discloses a one-side support formwork structure for enlarging a section and strengthening construction and a construction method. The structure comprises a side formwork assembly, anchor ribs implanted in an original concrete wall surface and pulling and connecting assemblies pulled and connected between the side formwork assembly and the anchor ribs, a pouring space for pouring strengthened structures is formed between the side formwork assembly and the original concrete wall surface, and each pulling and connecting assembly is provided with a top formwork rib which abuts against the inner side of the side formwork assembly. According to the one-side support formwork structure for enlarging the section and strengthening construction and the construction method, due to the fact that the anchor ribs are implanted in the original concrete wall surface, the pulling and connecting assemblies are welded to the anchor ribs, side plate assemblies are pulled and connected to the anchor ribs through the pulling and connecting assemblies, and the pouring space for pouring the strengthened structures is formed between the side formwork assembly and the original concrete wall surface, the difficulty of strengthening of the one-side support formwork structure in the strengthening project can be solved by means of matching of the anchor ribs and the pulling and connecting assemblies, and meanwhile the pulling and connecting strength of the side plate assemblies and the original concrete wall surface is improved.

The invention relates to the technical field of polytetrafluoroethylene microporous plates, in particular to a multifunctional expanded polytetrafluoroethylene plate and a lamination composite preparation process thereof. The polytetrafluoroethylene plate is made by mixing polytetrafluoroethylene, polytetrafluoroethylene modified material, fiber material, titanium dioxide and organic solvent evenly, pre-pressing and forming, extruding the bar, and pressing it into a film by twin-screw, then heating and volatilizing. The organic solvent is removed, and the polytetrafluoroethylene microporous film is obtained by horizontal and longitudinal stretching, and the polytetrafluoroethylene microporous film is made into a multifunctional polytetrafluoroethylene plate with high tensile strength through a lamination and composite process. The invention has low preparation cost, simple preparation process, good sealing, chemical stability, thermal stability and electrical insulation, as well as good creep resistance, tensile strength and antibacterial properties.

The invention discloses a nutria tail collagen surgical suture and a preparation method thereof. The method comprises the following steps: cutting standby nutria tail tendons into thin pieces, performing enzyme treatment by a ficus proteinase solution, preparing extracted natural collagen into a spinning solution, performing forming through a solution wet-spinning technology, and performing cross-linking to prepare the nutria tail collagen surgical suture which is a continuous long filament. The surgical suture has the diameter of 0.118-0.135 mm, the knot strength of 450-510 g and the elongation rate of 10.1-12.3%. The surgical suture meets the requirements of American suture size 6 / 0 and is suitable for clinical suturing. Biological experiments and clinical trials prove that the nutria tail collagen surgical suture has various advantages of mild tissue reaction, naturalness, degradability, non-toxicity, stability and reliability for absorption, high tensile strength, no need of being taken out, capability of being naturally absorbed or naturally falling off, no irritation, no scars after wound healing, and the like.