In order to meet the demand for flame retardant and antistatic of the protective cloth-ing for oil workers,taking the aramid stock solution of 1313/flame retardant viscose(Lenz-ing)/flame retardant nitrile chloride 40/30/30 19.7 tex blended yarn as the warp yarn,and ar-amid stock solution of 1313/flame retardant viscose(Lenzing)/flame retardant nitrile chloride/conductive fiber 38/30/30/2 19.7 tex blended yarn as the weft yarn,a flame retardant anti-stat-ic fabric with plain weave is developed.By introducing the yarn specifications and the weave structure of the fabric,the points for attention in the warping process and sizing process,as well as the causes and solutions of broken warp and broken weft in the weaving process are ana-lyzed.It is pointed out that for the single strand yarn with low strength,the improvement of the elongation at break and the increase of abrasion resistant number should be focused in sizing process.Weaving should be analyzed and adjusted from the aspects of the selvage weave threa-ding method,opening time,rapier head motion,back beam and stop frame position.After ad-justment,the average efficiency of the machine that weaves the flame retardant fabric is 87％,the first class product rate is 91％(excluding yarn defects),the loom efficiency is high,and the cloth quality is good.
In order to solve the problem that the abnormal index of traditional cheese detection can only be fedback but cannot be traced back to the root,the operation method of cheese test sampling is optimized,and the method of random sampling on automatic winder is proposed to take yarn sample on spinning frame according to a certain rule,and its implementation scheme is analyzed.The actual spinning case application and effect evaluation show that the new sam-pling operation method is more representative,and the abnormal problems found in the test can be directly traced back to the frame and spindle number of the spinning frame,the correspond-ing roving until the drawing process,which can reduce the abnormal yarn generation and im-prove the spinning quality.Recording,summarizing and strengthening management according to the causes and solutions of problem yarn tracing,is conducive to the formation of PDCA vir-tuous cycle of total quality management in textile enterprises;according to statistics,the abnor-mal yarn decreased by more than 30％after the implementation of the new sampling method for one year.
In order to better exert the performance of spinning cradle,stabilize and improve the spinning quality,the classification and requirements of the spinning frame are introduced,and the changes and progress of the material,structure and performance of the weight compression mechanism,coil spring compression cradle,plate spring compression cradle and pneumatic com-pression cradle are analyzed in detail.Through the test,the bobbin yarn quality of different types and different structures of cradle is compared,and the yarn quality and the mechanism of pressure distribution of T/R yarns under different pressure configurations are verified.The key points of use and maintenance of cradle are described,and the development trend of cradle is prospected.It is pointed out that in the past 50 years,the cradle technology has developed by leaps and bounds,and the spinning production should be based on the structure characteristics of the cradle,ensure the installation accuracy of the cradle,reasonably distribute the three-zone pressure of the cradle,and do well the pressure adjustment and maintenance of the cradle.It is the development direction of the cradle to ensure the consistency,stability and durability of the pressure,and to enhance the adaptability,manufacturing accuracy,consistency,ease of operation and maintenance and intelligence of the cradle.
In order to improve the quality of hemp/cotton combed yarn and solve the problem of excessive dropping hemp and big fiber damage in combing process,according to the properties of hemp/cotton blended raw materials and combing process characteristics,the optimum design of the integral cylinder and top comb for the hemp/cotton combing machine is described in de-tail.Using hemp/cotton 40/60 blended combing small volume as raw materials,the single fac-tor test method is used to design the test scheme,and the effects of different top comb tooth density and different total teeth number of integral cylinder on combed sliver,dropping cotton(hemp)rate and yarn index are compared and analyzed.It is pointed out that the selection of top comb tooth density should be based on combing small volume hemp/cotton blended ratio,and the matching of combed cylinder and top comb should be based on the dropping hemp rate,yarn neps and hemp grain quality index.GJX-E-90-TP28 integral cylinder matching GJD-E-240-P top comb should be selected for low dropping cotton(hemp)rate of hemp/cotton 40/60 blended spinning,GJX-E-90-J integral cylinder and GJD-E-260-B top comb should be used to control the quality of neps and hemp grains.It is beneficial to improve the combed sliver,yarn quality and hemp fiber content by carrying out the research on the key technology of hemp/cotton blended spinning,selecting the integral cylinder and top comb combined with combed quality and rec-ommended scheme.
In order to improve the weaving performance of air-jet loom,the existing problems of four-link beating-up mechanism,six-link beating-up mechanism and conjugating cam beating-up mechanism are analyzed,and a solution for conjugating cam beating-up mechanism which can meet the needs of different width and speed of air-jet loom is proposed.The shape and motion curve of conjugating cam are introduced,and its curve changes of displacement,velocity,accel-eration and sharp jump(leap)are compared with those of four-link and six-link.Based on the analysis of the shortcomings of the large static angle cam with the rear dead center completely stationary and the large static angle cam with the active swing of the rear dead center,the imi-tation eight-link conjugating cam beating-up mechanism is designed.It is pointed out that the curve of the conjugating cam beating-up mechanism is smooth and without abrupt change,which can be used in high-speed narrow air-jet loom.With a relative static angle of about 200° at the rear dead center of the imitation eight-link conjugating cam beating-up mechanism,the acceleration and jump curve are smooth and close to the beating-up curve of the linkage mecha-nism,which can meet the weaving needs of high speed and wide width air-jet loom with more weft insertion time and greater beating-up force.
