51results about How to "Increase draft ratio" patented technology

The invention discloses a preparing method of a PET / PTT parallel complex filament with high self-crimpiness. PET and PTT are sliced, dried and crystallized, afterwards, the PET and PTT are fused separately and subjected to extrusion molding through a parallel-type spinneret plate, oil is applied after cooling, then level 1-3 drafting and heat setting treatment are adopted, during drafting, the total drafting rate is controlled to be 3-3.5, the level-1 drafting rate is 2.8-3.0, and the temperature is controlled to be 75-80 DEG C. According to the preparing method of the PET / PTT parallel complexfilament with high self-crimpiness, methods like multi-level drafting for increasing the drafting rate are adopted, and the effects of improving the fiber strength, moderately lowering the elongationat break, and greatly improving the self-crimpiness are achieved.

The invention provides a method for producing fine chinlon 6 fully drawn yarn with high strength which includes steps as follows: (1) chinlon 6 slice enters into a screw extruder with electrical heating function through a storage hopper that makes slice showing melt shape; (2) the melt material is pressed in a spinning subassembly through a metering pump quantificationally, and is spout by a spout plate for forming filament bundle in a spining box body; (3) the filament bundle is cooled by side wind through the spinning box body and is cooled further through a corridor; (4) the cooled filament bundle is oiled by an oil roll; (5) oil in the filament bundle is more uniform and has high amplexus degree through confounding; (6) the filament bundle passes through a first group filament guide roll and a second group filament guide roll for drafting forming, then passes through a third filament guide roll to reel. A grade product produced by the method has average more than or equal to 6.0cN / dtex rupture strength that is higher 22% than the product produced by normal method, and has better transparent sense and visual effect, the produced clothes has better flexible sense and handle sense for wearing cosily.

The invention discloses a four-roller three-thick-yarn feeding full compact spinning device which comprises four groups of drafting roller pairs. A distance-adjustable three-flared-opening feeding unit is additionally arranged at a position of the yarn guide rod of a back roller; a mechanical magnetic collector is additionally arranged on the back roller; a middle-rear roller is a narrow groove type positive pressure hollow roller; the jaw portion of the middle-rear roller is additionally provided with a separating roller unit; a front-middle roller is a narrow groove type negative pressure hollow roller; a front roller is a large-diameter narrow groove type negative pressure hollow roller. A yarn spinning method utilizing the four-roller three-thick-yarn feeding full compact spinning device comprises feeding three thick yarn of A thick yarn, B thick yarn and C thick yarn through the distance-adjustable three-flared-opening feeding unit in a spinning process from the rear roller, and obtaining needed yarn through four-roller-and-three-section draft. According to the four-roller three-thick-yarn feeding full compact spinning device, the total draft multiple can be improved to more than 300 times to the maximum, accordingly the simultaneous feeding of three kinds of thick yarn of an ordinary fixed quantity for spinning can be achieved, and the spinning efficiency can be effectively improved. Besides, high-quality color yarn can be provided.

The invention provides a modified polyphenylene sulfide fiber and a preparation method thereof. The components and parts by weight include: 100 parts of polyphenylene sulfide (PPS); 0.2 to 2 parts of nano silicon dioxide after surface treatment, two The particle size of silicon oxide is 20-60 nanometers; the fineness of the fiber is 85-91dtax. The present invention modifies the polyphenylene sulfide resin and adopts a specific spinning process to prepare polyphenylene sulfide fiber, the fiber strength and tensile toughness are improved, and the glossiness of the fiber is also improved at the same time. The spinning equipment is used for spinning, which reduces the spinning cost, and the fluidity of the matrix becomes better during the spinning process, the spinning temperature is reduced by 5-10°C, the draft ratio of the primary fiber is improved, and the mechanical properties of the fiber Improved.

A method for processing a small-scale blended modified polypropylene luminous rope for fishing, which relates to a processing method for a luminous rope for fishing. It is necessary to provide a method for processing a small-sized blended modified polypropylene luminous rope for fishing. The present invention uses PP resin, HDPE resin, luminescent powder, additives, characterized in that the mixture of PP resin, luminescent powder, zinc stearate and white oil is extruded and granulated to obtain a blend masterbatch; the blend masterbatch, PP resin The mixture of HDPE resin and HDPE resin is melted and extruded through the extruder, and the melt-extruded as-spun filaments are cooled and pre-drawn, and the pre-drawn filaments are cooled by airflow after two hot drafts. Using blended modified polypropylene luminous filaments, twist 36 luminous filaments to make a "Z" luminous rope yarn, and use 6 "Z" luminous rope yarns to make "S" directional strands, and three strands The "S" strands are twisted in the "Z" direction to make a small-size blended modified polypropylene luminescent rope for fishing. The invention is used for fishing luminescent ropes.

Disclosed is an industrialized polyimide fiber drafting method. The method includes that a certain deniers of polyimide yarn sheets with uniform tension are placed in a four-part type hotbox environment and clamped by a rubber roller, under a certain feeding speed, the yarn sheets achieve a certain multiple drafting through a speed difference between a front drafting machine and a rear drafting machine, and the four-part type hotbox is a combination of a prehearing section hotbox, a superheated steam humidifying section hotbox, a high temperature drafting hotbox and a setting hotbox. During the process of the fiber treatment, the temperature changing gradient is reasonable, the impact thermal load which is stressed on the fibers is small, and the probability that the yarn sheets generate broken filaments is remarkably reduced. The fibers are subjected to superheated steam humidifying treatment before the high temperature drafting, the static electricity in the yarn sheets is eliminated, the drafting force of the same number of fibers is reduced by 25%, the draft multiple is increased by 30%, and the strength of the fibers is increased 40%. After the polyimide fibers are subjected to the drafting and high temperature setting, the internal stress of the polyimide fibers is eliminated, the stability of the fiber structure is improved, and the shrinking rate of the polyimide fibers is maintained about 2%.