Study on airflow field and fiber motion with new melt blowing die

In order to reduce the fiber diameter and the energy consumption in the meltblowing process, a modified slot die with two blocks was designed in this article. The numerical calculation and the experimental verification of the airflow field under the modified slot die were carried out, and the effect of the block structure parameters on the air field was investigated. The research results indicate that compared to the common slot die, the modified slot die with the blocks could increase the velocity on the spinning line and reduce the rate of the temperature decay on the spinning line. When the block width and the block inclination angle lower, and the block height expands, it could increase the peak of the air velocity, the temperature and the turbulence intensity on the center line of the air field under the modified slot die. The average velocity on the spinning line of the modified die under the conditions of block width = 20 mm, block height = 30 mm and block inclination angle = 60° is the highest.

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“…Han et al. 21 calculated the velocity and the temperature under a new slot die with auxiliary air channels. Wang et al.…”

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confidence: 99%

The effect of the geometric structure of the modified slot die on the air field distribution in the meltblowing process

Wang

Qiu

et al. 2021

Textile Research Journal

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“…It can be seen in Figure 6(a) that a recirculation zone [8,19], where there is full of separation vortex, is close to the common slot die. This condition is a typical kinetic energy loss.…”

Section: Numeral Calculation Results and Discussionmentioning

confidence: 99%

Numerical investigation on a melt-blowing die with internal stabilizers

Wang

Sun

2019

Journal of Industrial Textiles

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In order to decrease the fiber diameter and reduce the energy consumption in the melt-blowing process, a new slot die with internal stabilizers was designed. Using computational fluid dynamics technology, the new slot die was investigated. In the numerical simulation, the calculation data were validated with the laboratory measurement data. This work shows that the new slot die could increase the average velocity on the centerline of the air-flow field by 6.9%, compared with the common slot die. Simultaneously, the new slot die could decrease the back-flow velocity and the rate of temperature decay in the region close to the die head. The new slot die could reduce the peak value of the turbulent kinetic energy and make the fiber movements more gradual. With the one-dimensional drawing model, it proves that the new slot die has more edge on the decrease of fiber diameter than the common slot die.

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“…This was consistent with previous research on the melt-blowing process, which also suggested that fluffy "curved" micro-nano fibers were responsive to the varied die temperatures. 22,40,41 Moreover, with constant PE concentration, the die temperature's influence was higher than the PE concentration. On the other side, varying the PE mass content within the processable range would lead to softer polymers.…”

Section: Softness Propertiesmentioning

confidence: 97%

Tailoring the softness performance of polyethylene/polypropylene micro‐nanofibrous fabrics for skin contacts

Zhen

Zhang

Sun

et al. 2021

J of Applied Polymer Sci

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The softness of polypropylene (PP) fabrics, which is related to fiber properties and fabric structure, is a pivotal perception for their application in skin contacts. However, tailoring the softness of PP fabrics remains challenging. The effects of mixing different percentages of polyethylene (PE) and PP during the melt-blowing process on the polymer properties and morphology characteristics, including the softness, preparation, and characterization of the micro-nanofibrous fabrics were determined. Rheological tests and differential scanning calorimetry results showed that the addition of PE helped destroy the crystalline integrity of PP. Moreover, scanning electron microscopy images depicted a fluffy structure consisting of micro-nanofibers with average diameters ranging from 1.3 to 3.2 μm. Furthermore, the softness scores ranged from 70.39 to 83.11 by changing the die temperature and PE mass ratio by applying a response surface model. Consequently, this micro-nanofibrous fabric may become a good material for skin contacts, such as baby diapers, feminine sanitary, and other personal hygiene uses.

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Study on airflow field and fiber motion with new melt blowing die

Cited by 13 publications

References 29 publications

The effect of the geometric structure of the modified slot die on the air field distribution in the meltblowing process

The effect of the geometric structure of the modified slot die on the air field distribution in the meltblowing process

Numerical investigation on a melt-blowing die with internal stabilizers

Tailoring the softness performance of polyethylene/polypropylene micro‐nanofibrous fabrics for skin contacts

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