42 results about "Fiber elongation" patented technology

The invention provides a skin core composite fiber, a manufacturing method thereof and a fabric. The skin core composite fiber is formed by composing a skin layer made of polyamide and a core layer made of polyester and satisfies the following properties: (1) 0.6g/d <fiber fracture strength <2.5g/d; (2) 15% <fiber fracture elongation rate <50%; (3) 6g/d <fiber modulus 0-5% (Mod0-5%) <40g/d; wherein Mod0-5% = (strength at fiber elongation 5%)/(0.05).

The invention provides a wood bundle fiber elongation distribution and break strength distribution testing method based on the principle of acoustic emission. A bundle fiber strength tester, a single fiber strength tester, a computer with an acoustic card and two microphones of same specification are used, both the bundle fiber strength tester and the single fiber strength tester provide constant speed elongation, the microphones are fixed to the bundle fiber strength tester and the single fiber strength tester and are L mm away from bundle fibers or a single fiber under tension. The method according to the invention has the advantage that elongation distribution and break strength distribution of each single fiber are measured accurately during bundle fiber tensioning based on acoustic emission measurement technique.

The invention relates to the production process of the fiber used for high-strength and low-extension polypropylene rope, which is mainly applied in the aspects of preparing high-strength ropes, project reinforcement, etc. The invention is a high-strength and low-extension modified polypropylene fiber, comprising interpolymer modified from polypropylene raw material, the adjusting screw of a twin screw extruding machine, the length-diameter ratio of which is increased, a mixing device added at the plasticizing section of the screw and a high pressure spray; after having been sprayed under high pressure, shockchilling is carried out immediately to enhance the monofilament crystallinity of the fiber; a high-temperature oil bath stretching leads the fiber molecular chain to be extended in symmetrical arrangement; a high-temperature steam stretching leads the polypropylene fiber molecular chain to be stretched fully and arranged evenly with high-strength and low-extension; the synnema of a multifilament twisting is encircled as the product fiber. The total denier of the gained high-strength and low-extension polypropylene twisting fiber of the invention is of 5000 deniers to 30000 deniers differently, the fiber strength is 8g/denier to 15 g/denier, and the fiber extensibility is 5% to 8%.

A fire-retarding refractory nano fibre is prepared through preparing nano additive from SiO2 and Al2O3, mixing it with cellulose, preparing spinning dope, and spinning. Its advantages are high strength and elongation, low moisture regain, and high refractory effect (1300 deg.C).

The invention discloses an elastic composite fiber. The elastic composite fiber has a parallel composite structure in the cross section, which is compounded after separately extruding water-absorbingmodified PET and PTT at a mass ratio of 48 to 52 to 52 to 48. The elastic composite fiber disclosed by the invention has an excellent water absorption and quick drying performance and a soft touch; the groove formed between the two components along the fiber elongation direction makes the parallel composite fiber have good moisture conductivity and quick drying performance; the breaking strength is greater than or equal to 2.8cN/dtex, and the elongation at break is 24% to 30%; the composite elastic fiber has a high degree of curling and fluffiness similar to wool, which is suitable for the application of close-fitting clothing, and expands the use of the elastic composite fiber; and the shrinkage rate is 40% to 45%. The elastic elongation of the fabric is greater than or equal to 25%, theelastic recovery rate is greater than or equal to 98%, the water absorption is that the dripping diffusion time is less than 1s, the diffusive residual moisture rate is 10%, and the required time is less than or equal to 50min.

The invention relates to a viscose filament yarn semi-continuous spinning machine and a spinning process thereof. The viscose filament yarn semi-continuous spinning machine comprises a frame. A glue spray device, a lower solidifying roller and an upper solidifying roller are arranged on the frame. An upper drafting disc is coaxially arranged at the end part of the upper solidifying roller and a lower drafting disc is coaxially arranged on the lower solidifying roller. Since the upper drafting disc and the lower drafting disc are arranged for drafting nascent filaments to break down a large draft multiple into a plurality of small draft multiples for times of drafting, the invention has the advantages that the one-step large-multiple drafting is avoided, the situation that the fiber elongation is reduced because the filaments are damaged is avoided, viscose filament yarns with high strength and elongation which satisfies process requirements can be spun, the strength of the viscose filament yarns can reach above 2.5CN/dtex and the viscose filament yarns can be used as both the warps and the wefts of fabrics.

The invention discloses a process for producing bamboo charcoal polypropylene composite fibers. The process comprises the steps of mixing bamboo charcoal micro-powder with polypropylene slices to ensure that the bamboo charcoal micro-powder is uniformly dispersed in the polypropylene slices; extruding the mixture by using a twin-screw extruder to obtain bamboo charcoal master batches; mixing the bamboo charcoal master batches with polypropylene slices; heating and drying the mixture under the protection of an inert gas; spinning the mixture through a melt spinning machine; and applying oil, and molding by coiling, thus obtaining the bamboo charcoal polypropylene composite fibers. Therefore, by adopting the process for producing the bamboo charcoal polypropylene composite fibers, the prepared fibers has high extensibility, small difference of wet strength and dry strength, high strength, good shaping stability and capability of improving the durability of a fabric; the fabric has high sunlight resistance and high fluffiness, and the added bamboo charcoal has the functional characteristics of adsorbability, antibiosis and the like, so that the process is simple for preparation, reduces the production cost, and is suitable for large-scale batch industrialized production.

A PGA/PLA copolymer suture fiber having a fiber tenacity of between approximately 7.2 to 8.0 grams per denier and a fiber elongation between approximately 22% and 35% is produced by a process that utilizes extruder apparatus having at least one heated zone that is maintained at a temperature of from about 20° C. below the copolymer melting point to about 5° C. above the copolymer melting point, a metering pump and a heated block that are maintained at a temperature of no more than about 40° C. above the copolymer melting point, a spinneret that is maintained at a temperature of from about 40° C. to about 60° C. above the copolymer melting point, and an elongated heated sleeve extending between six and twenty inches from the spinneret that is maintained at a temperature of at least about 60° C. above the copolymer melting point.

The invention discloses an improved PBT (polybutylene terephthalate) fiber spinning technology adopting a POY technology. The spinning technology comprises the steps as follows: modified PBT masterbatch is obtained through copolymerization of ethylene terephthalate, 1,3-butanediol and 5-sodium sulfonate-1,3-glycol isophthalate, the dried modified PBT masterbatch, glass fiber and titanium dioxide particles are extruded and mixed at a certain temperature, a spinning melt is prepared, spinning is performed in a spinning box after prefiltration, nascent fiber is obtained and cooled by a circular blowing cooling system, cooled tows are oiled and guided by a guide system, and the prepared modified PBT fiber is easy to deeply dye at the normal temperature, has the color fastness up to 4-4.5 grade, the breaking strength of 2.3-3.0 cN/dtex and the elongation at break of 90%-110%. A hydrophilic group is introduced into the modified PBT fiber, so that the modified PBT fiber is easy to dye at the normal temperature, the strength of the fiber can be improved after the fiber is blended with the glass fiber and the titanium dioxide particles, the fiber has an ultraviolet-proof function, and the prepared fiber has higher elongation and is easy to further draw and process later.

The invention discloses a cotton fiber specificity promoter GhFLA1 and a gene complete sequence thereof, relating to an important regulatory element related to cotton fiber development. The FLA1 gene complete sequence has totally 1920bp and comprises a 5' end promoter and a gene coding sequence. The gene does not contain an intron and encodes an arabinogalactan protein (AGP). The cotton fiber contains a great amount of the AGP protein, and that AGP irreversible inhibitor can inhibit fiber elongation shows that the protein has an important role for cotton fiber development. That the FLA1 gene mRNA has a great amount of specificity accumulation in the process of cotton fiber cell development shows that the gene promoter plays an important role in the regulation of fiber specificity expression. Experiments also show that the promoter has strong expression activity in tobacco leaf epidermal hair, which further proves that the promoter is the specificity regulatory element of the cotton fiber. The promoter can be used as a gene cis-regulatory element to be applied to cotton molecular breeding research so as to improve the cotton fiber quality and to enhance the cotton yield.

The invention relates to the technical field of quality breeding of cotton fibers and specifically relates to a GhJMJ12 gene SNP marker related to cotton fiber quality and application of the same. TheGhJMJ12 gene SNP marker related to cotton fiber quality is located at the 7215bp locus of a GhJMJ12 gene of a Dt09 chromosome of cotton, the SNP marker is a base A or C, and the GhJMJ12 gene has a nucleotide sequence shown by SEQ ID NO:1. According to the invention, 10660 SNP markers are used for whole genome association study of quality characters of the cotton fibers, and the study indicates one SNP locus on the GhJMJ12 is significantly correlated with fiber quality characters such as the fiber length, the fiber specific strength, the fiber elongation and the fiber uniformity.

The invention relates to applications of an HOX3 gene in improving the cotton fiber elongation property, specifically, the invention provides the applications of the cotton fiber elongation gene GhHOX3 gene of cotton and polypeptide of the cotton fiber elongation gene GhHOX3 gene in improving the cotton fiber elongation property. The experiment proves that the genomic gene of the cotton fiber elongation gene GhHOX3 can effectively and exclusively improve the cotton fiber length in the molecular level, and the synchronous improvement of the yield of the cotton fiber is realized.

The invention relates to the field of plant gene engineering. The invention discloses two cotton fiber elongation stage preferential expression promoters and their application. In the invention, the two cotton fiber elongation stage preferential expression promoters of an island cotton gene GbEXPA1 and an island cotton gene GbEXPATR are cloned and identified, wherein nucleotide sequences of the two cotton fiber elongation stage preferential expression promoters are respectively shown in a sequence table 1 and a sequence table 2. In cotton, the two cotton fiber elongation stage preferential expression promoters are fiber specific/preferential expression promoters. A plant expression vector obtained by fusion construction of DNA sequences of a GUS gene and the two cotton fiber elongation stage preferential expression promoters of PGbEXPA1 and PGbEXPATR is transformed into cotton through an agrobacterium tumefaciens-mediated genetic transformation method and the transgenic cotton is subjected to dyeing identification. A result of the dyeing identification shows that the GUS gene is preferentially expressed in cotton fibers. Expression modes of the two cotton fiber elongation stage preferential expression promoters are almost same. Through a series of processes of fusion of cut promoter sequences and the GUS gene, a transgenic cotton verification result shows that a sequence of -461bp to -1bp is a core sequence of the promoter of PGbEXPA1. The invention also discloses a recombinant expression vector containing the promoter of PGbEXPA1. The recombinant expression vector can be utilized for cultivation of a transgenic plant, wherein the island cotton gene GbEXPA1 is specifically expressed in a root of the transgenic plant.

The invention discloses a fiber elongation-stage predominant-expression promoter, and a preparation method and an application thereof. The promoter mainly predominantly expresses in an elongation stage, two promoters comprising PGhGLP2 and PGbGLP3 and GUS are fused, and the obtained fusion converts cotton, chemical dyeing of fibers shows that the two promoters comprising PGhGLP2 and PGbGLP3 do not express in ovules in the bloom day, the expression of the GUS can be detected in fibers from 1DPA, and the expression of the GUS cannot be detected in the ovules. The expression peaks of the two promoters are in the cotton fiber elongation stage. The elongation stage is a very key stage for the cotton fibers, and the utilization of the specific expression of some genes important to the formation of high-quality fibers by the promoter in the heredity improvement will increase the cotton output without influencing the growth of other tissues and organs.

The invention provides a transcription factor GhbHLH18 for expression of the elongation period of cotton fibers and application thereof, belongs to the field of plant molecular biology and gene engineering and discloses a transcription factor GhbHLH18 related to the development of the cotton fibers and playing an important role in the fiber-elongation process and application thereof. The nucleotide sequence of the transcription factor GhbHLH18 is shown in SEQ ID NO.1. The transcription factor GhbHLH18 has the following characteristics that (A) the expression condition in cotton tissues and fibrocytes in the fiber-elongation process is very clear, and the transcription factor is not reported on plants such as cotton; (B) the transcription factor provided by the invention plays an importantrole in adjustment in the cotton fibers-elongation process and has an influence on the quality of the cotton fibers.

The invention discloses a method for preparing phenolic modified melamine fibers by a one-step method. The method comprises the steps of dissolving a water-soluble polymer in water, adding melamine, an aldehyde compound and a phenolic compound, and reacting under the action of an alkaline catalyst to obtain a resin solution of melamine modified by the phenolic compound; and performing wet spinningand heat curing to obtain the finished phenolic modified melamine fibers. The melamine fibers prepared through modification have the advantages of high nitrogen content, zero halogen, good flame retardance, high fiber elongation and the like, and have a good application prospect.

The invention discloses a cotton phytosulfokine precursor (PSKP) gene GhPSKP and its preparation method and use. Through the preparation method, an EST which is highly homologous with a PSKP gene of other plants is separated from expression profiles of different cotton fiber growth periods, and bioinformatics analysis proves that the EST contains a complete ORF and is named as GhPSKP; the gene GhPSKP can be expressed highly in all fiber elongation periods, 10 DPA fiber total RNA is extracted from an upland cotton variety YZ1, the total RNA is reversely-transcribed by a reverse transcriptase Superscript III so that cDNA is obtained, and a full-length cDNA of the gene GhPSKP is obtained by amplification adopting primers of GhPSKPF and GhPSKPR; and the PCR product obtained by amplification is introduced into a pGEM-T carrier, positive clone is screened and is subjected to sequencing so that the full-length cDNA of the gene GhPSKP is obtained. An experiment proves that the gene GhPSKP can be preferentially expressed in the cotton fiber fast-elongation stage. Through excess expression of the gene GhPSKP based on a transgenosis method, fiber elongation is effectively promoted. The gene GhPSKP can effectively promote cotton fiber elongation and improve cotton fiber quality.