Meltblown mold head for preparing ultrafine fibers

A melt-blown die and ultra-fine fiber technology, which is applied in the field of melt-blown nonwovens, can solve the problems of difficult processing of the pointed die, increase the processing cost, and the tip end is easily damaged, so as to reduce the processing cost and reduce the processing cost. difficulty, and the effect of reducing energy consumption

Active Publication Date: 2012-11-21
安徽深呼吸纺织科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing of the pointed die is difficult, which increases the processing cost, and the pointed end is easily damaged

Method used

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  • Meltblown mold head for preparing ultrafine fibers
  • Meltblown mold head for preparing ultrafine fibers
  • Meltblown mold head for preparing ultrafine fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] The new die head structure is attached image 3 Shown in: A=0.59mm, C=0mm, α=60°, β=60°, G=0.65mm, H=5mm, N=4mm, D=0.4mm, E=0mm and F=0 .65mm. The die head adopts continuous double-groove holes, and the length Q of the flow stabilizer is equal to the width P of the die head. The other dimensions of the double-groove blunt die used for comparison are the same. Spinning conditions: hot air temperature is 230°C, melt temperature is 270°C, air pressure at the inlet end of the air tank is 0.3atm; spinning raw material is polypropylene, melting temperature is about 170°C, and melt index is 1800. The specific experimental results are shown in Table 1.

[0086] Table 1 Experimental Results I

[0087]

[0088] Note: d-average diameter of fibers prepared by the new die; △d-diameter reduction, that is, the average diameter reduction of fibers prepared by the new die compared to the blunt die; △v-velocity increment, that is, the new die The maximum difference in spee...

Embodiment 2

[0090] The new die head structure is attached image 3 Shown in: A=0.76mm, C=0mm, α=60°, β=60°, G=0.65mm, H=5mm, N=4mm, D=0.2mm, E=0mm and F= 0.65mm; the style of the stabilizer inside the air groove is as Figure 5 As shown, the length Q of the stabilizer is equal to the width P of the die head. The other dimensions of the double-groove blunt die are the same. Spinning conditions: hot air temperature is 150 °C, melt heating temperature and spinning assembly temperature are both 210 °C, air pressure at the inlet end of the air tank is 0.2 atm; spinning raw material is low melting point multi-component copolyamide, melting temperature is about 120°C, the melt index is 35. The experimental results are shown in Table 2.

[0091] Table 2 Experimental Results II

[0092]

Embodiment 3

[0094] New die structure such as figure 2 Shown: A=0.76mm, C=0mm, α=60°, β=60°, G=0.65mm, H=5mm, N=4mm, D=0.2mm, E=0.76mm, O =2mm and F=0.6mm; Figure 5 As shown, the length Q of the stabilizer is equal to the width P of the die head. The other dimensions of the double-groove blunt die are the same. Spinning conditions: hot air temperature is 190°C, melt heating temperature and spinning assembly temperature are both 230°C, air pressure at the inlet end of the air tank is 0.5atm; spinning raw material is polyurethane, and the melting temperature is about 160°C °C, the melt index is 1200. The experimental results are shown in Table 3.

[0095] Table 3 Experimental Results III

[0096]

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Abstract

The invention relates to a meltblown mold head for preparing ultrafine fibers. The meltblown mold head comprises a spinning plate and an air plate, wherein the middle of the end surface of the spinning plate is provided with a spinning hole, a plurality of crack grooves are formed between the spinning plate and the air plate, the crack grooves are positioned around the spinning hole, slantwise point to the spinning hole and are in central symmetry on the end surface by the spinning hole as the symmetry center, a separation flow stabilizing element is fixedly connected between the spinning hole arranged on the end surface of the spinning plate and the crack grooves, the cross section of the separation flow stabilizing element is in a right-angled triangle shape, in addition, one edge in two right-angled edges is connected with the end surface of the spinning plate, the other right-angled edge is near a spraying opening, the inclination degrees of the inclined edge of the right-angled cross section of the separation flow stabilizing element and a conical bus of the spinning plate relative to the crack grooves are identical, and meanwhile, the outer sides of the crack grooves are selectively connected with external flow stabilizing elements. The meltblown mold head has the advantages that the reverse backflow region is reduced, the jet flow diffusion to two sides is inhabited, the turbulence intensity is reduced, the fiber end breakage rate is reduced, the melt body is prevented from gluing on the mold head, the air temperature at the nearby part of the mold head is improved, the meltblown nonwoven energy consumption is reduced, and the fiber diameter is further refined.

Description

technical field [0001] The invention belongs to the field of melt-blown nonwovens, and in particular relates to a melt-blown die head for preparing superfine fibers. Background technique [0002] Melt-blown nonwoven technology began in the 1950s. It is a one-step technology that directly prepares ultrafine fibers and their fiber webs using polymer slices as raw materials. [0003] Earlier research, patent literature and related patent literature on the melt-blown nonwoven process, technology and die device include: [0004] 1. Naval Research Laboratory Report 4364 "Manufacture of Superfine Organic Fibers," Apr.15, 1954. [0005] 2. Wente, Van A., Industrial and Engineering Chemistry, 48, No.8 (1956, pp1342-1346). [0006] 3. Naval Research Laboratory Report 4364 "Formation of Superfine, Thermoplastic Fibers," Feb.11, 1959. [0007] 4. US patent document USP3379811. [0008] 5. US patent document USP3437725. [0009] 6. US patent document USP3441468. [0010] 7. US pate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D4/00
Inventor 王新厚王玉栋
Owner 安徽深呼吸纺织科技有限公司
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