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CN-122013335-A - Wave-shaped spinneret plate for producing special-shaped wool-like colored polyester yarns and obtained polyester yarns

CN122013335ACN 122013335 ACN122013335 ACN 122013335ACN-122013335-A

Abstract

The invention discloses a wavy spinneret plate for producing special-shaped wool-like colored polyester yarns, relates to the technical field of polyester yarn production equipment, and aims to solve the problems of poor texture, poor high-speed spinning stability, poor multicolor forming effect and the like of the conventional wool-like polyester yarns. The spinneret plate comprises a circular substrate and a plurality of groups of spinneret units, wherein each group of spinneret units is formed by coaxially connecting symmetrical wavy spinneret pore channels, gradient wall thickness flow channels and flow distribution cavities along the melt extrusion direction to form an integrated melt conveying and forming channel. The symmetrical wavy spinneret orifice adopts a curve structure, the roughness Ra of the inner wall is less than or equal to 0.1 mu m, the fiber directional micro-wave cross section is directly endowed, the gradient wall thickness runner is in a linear wall thickness decreasing design, the melt flow stability during high-speed spinning is ensured, and the multi-cavity concentric structure and the radial air guide rib plate are arranged in the flow distribution cavity, so that independent and uniform flow distribution of multicolor melt is realized. The polyester yarn with vivid wool-like texture, clear and uniform color and stable mechanical property can be produced by matching with specific spinning process parameters and multicolor melt MI difference control requirements. The invention does not need to rely on multicomponent polymers or post-dyeing technology, has high production efficiency and good environmental protection, can be widely applied to the high-end textile field, and has remarkable economic and social benefits.

Inventors

  • SHEN SHUNHUA
  • ZHANG JINGDONG
  • XU MINJIE
  • XIE MINGLAN

Assignees

  • 浙江汇隆新材料股份有限公司

Dates

Publication Date
20260512
Application Date
20260305

Claims (8)

  1. 1. The wavy spinneret plate for producing the special-shaped wool-like colored polyester yarns comprises a circular substrate and a plurality of groups of spinning units, and is characterized in that each group of spinning units is formed by sequentially communicating symmetrical wavy spinning pore channels, gradient wall thickness flow channels and a flow distribution cavity along the melt extrusion direction to form an integrated melt conveying forming channel, and the three are coaxially connected from top to bottom; the symmetrical wavy spinneret orifice adopts a curve structure, two ends of the orifice are respectively communicated with the outlet section of the gradient wall thickness runner and the outer surface of the substrate, and the roughness Ra of the inner wall of the orifice is less than or equal to 0.1 mu m; the gradient wall thickness flow channel is divided into an inlet section, a middle section and an outlet section along the extrusion direction, the inlet section is correspondingly communicated with a radial diversion channel at the bottom of the diversion cavity, and the central lines of the three sections of flow channels are collinear and are in smooth transition connection with the central line of the symmetrical wavy spinneret orifice; the axis of the flow distribution cavity is consistent with the extrusion direction, and independent radial flow guide channels are correspondingly arranged at the bottoms of the cavities and are respectively and independently communicated with the corresponding spinneret orifice channels.
  2. 2. The wavy spinneret plate for producing the special-shaped wool-like colored polyester yarns according to claim 1, wherein the upper end and the lower end of the symmetrical wavy spinneret pore canal are respectively communicated with the outlet section of the gradient wall thickness flow passage and the outer surface of the substrate smoothly.
  3. 3. The wavy spinneret plate for producing profiled wool-like colored polyester yarns according to claim 1, wherein the upper peaks and the lower valleys of the symmetrical wavy spinneret orifices are mirror symmetry on a section perpendicular to the extrusion direction, and the aperture of the spinneret orifices is adapted to the length of the gradient wall thickness runner outlet section while maintaining a constant orifice length along the extrusion direction.
  4. 4. The wavy spinneret plate for producing the special-shaped wool-like colored polyester yarns according to claim 1, wherein radial air guide rib plates are arranged between the cavities in the split cavities, and the rib plates are uniformly distributed at equal intervals along the circumferential direction.
  5. 5. The wavy spinneret plate for producing profiled wool-like colored polyester yarns according to claim 1, wherein the ends of the radial air guide rib plates are chamfered in an arc shape, the number of the radial air guide channels is consistent with that of the spinning units, and each air guide channel corresponds to one spinning duct.
  6. 6. The wavy spinneret plate for producing the special-shaped wool-like colored polyester yarns according to claim 1, wherein the spinneret plate is used for preparing the special-shaped wool-like wavy polyester yarns, and the spinning process parameters of the special-shaped wool-like wavy polyester yarns are that the melt temperature is 285 ℃ plus or minus 2 ℃, the side blowing temperature is 22 ℃ plus or minus 1 ℃, and the draft ratio is 3.5-4.2 times.
  7. 7. The wavy spinneret plate for producing colored polyester yarns with special-shaped wool according to any one of claims 1 to 6, wherein when trichromatic colored PET melt is used, the difference of melt index MI (190 ℃ C/2.16 kg) of each melt is not more than ±1.5 g/10 min, ensuring uniformity of wave morphology and definition of color segment.
  8. 8. The polyester yarn produced by the method for producing the special-shaped wool-like colored polyester yarn by using the wave spinneret plate as claimed in any one of claims 1 to 7, wherein the wave form corresponds to the structure of symmetrical wave-shaped spinning holes, and the cross section of the special-shaped wool-like colored polyester yarn is in a directional micro-wave shape.

Description

Wave-shaped spinneret plate for producing special-shaped wool-like colored polyester yarns and obtained polyester yarns Technical Field The invention relates to the technical field of polyester yarn production equipment, in particular to a wave-shaped spinneret plate for producing special-shaped wool-like colored polyester yarns and the obtained polyester yarns. Background The polyester yarn has the advantages of high strength, good wear resistance, easy management and the like, and is widely applied in the textile field. With the upgrading of consumption, the market has put forward higher requirements on the appearance texture and color expressive force of the polyester yarns, and the colored polyester yarns with the wool-like texture can replace natural wool, reduce the production cost and become industry research and development hot spots. The spinneret plate is a core component for forming polyester yarns, and the structural design of the spinneret plate directly determines the cross-sectional shape, the surface texture and the performance of the fibers. The existing wool-like polyester yarn spinneret plate is mostly used for simulating the cross section of wool through simple special-shaped pore channels (such as triangles and stars), so that natural micro-wave texture on the surface of the wool is difficult to form, meanwhile, the traditional spinneret plate is unreasonable in runner design, poor in melt flow stability during high-speed spinning, and easy to cause the problem of broken filaments and broken filaments. In addition, the existing multicolor polyester yarn production mostly adopts a post-dyeing process, has the defects of uneven dyeing, low color fastness, high environmental protection pressure and the like, and when the coextrusion molding is adopted, a common spinneret plate is difficult to realize uniform diversion and synchronous molding of multicolor melt, so that the color boundary of the fiber is fuzzy and the uniformity of the wave morphology is poor. The patent CN102260902A adopts a double-component melt and sheath-core type composite spinneret plate, so that the outer layer is PET, the inner layer is PBT, and the difference of shrinkage rates of the two layers is used for special-shaped forming of waves. However, the patent relies on the fact that two polymers have poor heat shrinkage, and cannot be used for single-component PET, so that the mechanical properties of the product are non-uniform, the wave structure is macroscopic folds, micro-scale directional waves are lacked, the wool-like hand feeling is poor, and the heat retention rate is only improved by 12.3%. Therefore, developing a spinneret plate capable of realizing wool-like micro-texture morphology, guaranteeing high-speed spinning stability and supporting multicolor synchronous molding becomes a key for solving the bottleneck of the prior art. Disclosure of Invention The invention aims to provide a wave spinneret plate for producing special-shaped wool-like colored polyester yarns, which is used for solving the problems in the background technology. The wavy spinneret plate for producing the special-shaped wool-like colored polyester yarns comprises a circular base plate and a plurality of groups of spinneret units, and is characterized in that each group of spinneret units is formed by sequentially communicating symmetrical wavy spinneret pore channels, gradient wall thickness flow channels and flow distribution cavities along the melt extrusion direction to form an integrated melt conveying forming channel, and the three groups of spinneret units are coaxially connected from top to bottom. The symmetrical wavy spinneret orifice adopts a curve structure, two ends of the orifice are respectively communicated with the outlet section of the gradient wall thickness runner and the outer surface of the substrate, and the roughness Ra of the inner wall of the orifice is less than or equal to 0.1 mu m; the gradient wall thickness flow channel is divided into an inlet section, a middle section and an outlet section along the extrusion direction, the inlet section is correspondingly communicated with a radial diversion channel at the bottom of the diversion cavity, and the central lines of the three sections of flow channels are collinear and are in smooth transition connection with the central line of the symmetrical wavy spinneret orifice; the axis of the flow distribution cavity is consistent with the extrusion direction, and independent radial flow guide channels are correspondingly arranged at the bottoms of the cavities and are respectively and independently communicated with the corresponding spinneret orifice channels. The symmetrical wavy pore canal determines the micro-ripple form of the fiber surface to realize wool-like effect, gradient wall thickness and flow passage to ensure the stability of high-speed spinning, and the split cavity supports multicolor wavy yarn for synchronous forming to form an integral precis