CN109056085A - Melt-blowing nozzles structure - Google Patents

Abstract

The present invention provides a kind of melt-blowing nozzles structures, comprising: nozzle intermediate mass (3) is provided with spinneret orifice (1) on the nozzle intermediate mass (3)；The nozzle side block (4) being set on the outside of the nozzle intermediate mass (3), airflow channel (2) are formed between nozzle side block (4) and the nozzle intermediate mass (3), nozzle block inner fovea part (5) when block (4) have close to the lower surface of air-flow outlet side.Melt-blowing nozzles structure provided by the invention, the near exit for effectively reducing spinneret orifice forms the probability in gas backstreaming area, the gas flowfield near spinneret orifice is set to be more advantageous to the stretching of melt, and then under the premise of not increasing energy consumption, the diameter of meltblown fibers can be effectively reduced, in order to obtain thinner fiber, effectively save cost on the basis of not changing orifice diameter.

Description

Melt blown nozzle structure

technical field

The invention relates to the technical field of fiber preparation equipment, in particular to a melt blowing nozzle structure.

Background technique

During the melt blown process, after the air flow is ejected from the air flow channel, the melt extruded from the spinneret hole is stretched.

However, the lower surface of the nozzle side block is flat, and under the action of the lower surface of the nozzle side block, the airflow will form a backflow between the melt and the nozzle, that is, the direction of the airflow is opposite to the stretching direction of the melt, which is not conducive to the stretching of the melt .

At present, in order to solve the stretching problem and prepare finer melt-blown fibers by using the melt-blown nozzle structure, pointed nozzles are usually used. The pointed nozzle greatly reduces the reflow area of the gas flow field near the exit of the spinneret hole (this area obviously exists in the gas flow field of the blunt nozzle, which is not conducive to the stretching and thinning of the melt), and increases the impact of the gas flow on the melt. stretching effect. However, due to the high processing accuracy requirements of the pointed nozzle, the processing of the spinneret holes is difficult and the production cost is relatively high.

Reducing the diameter of the spinneret hole or increasing the aspect ratio of the spinneret hole can also reduce the diameter of the fiber. However, the above-mentioned configurations will increase the processing difficulty of the spinneret hole, resulting in an increase in production cost. Moreover, too small spinneret hole diameter will also make the raw material adaptability of meltblown technology worse.

Therefore, how to reduce the diameter of melt-blown fibers and save production costs is an urgent problem to be solved by those skilled in the art.

Contents of the invention

In view of this, the present invention provides a melt-blown nozzle structure to reduce the diameter of melt-blown fibers and save production costs.

To achieve the above object, the present invention provides the following technical solutions:

A melt-blown nozzle structure, comprising:

The middle block of the nozzle, the middle block of the nozzle is provided with a spinneret hole;

The nozzle edge block is arranged on the outside of the nozzle middle block, an air flow channel is formed between the nozzle edge block and the nozzle middle block, and the lower surface of the nozzle edge block near the air outlet end has an inner concave part of the edge block.

Preferably, in the above-mentioned meltblown nozzle structure, the outer wall of the air flow channel intersects the inner side of the side block;

The outer wall of the air flow channel is the side wall of the nozzle side block facing the nozzle middle block and used to form the air flow channel;

The inner surface of the side block is the inner concave surface of the inner concave part of the side block.

Preferably, in the above melt-blowing nozzle structure, the air flow channel is an inclined channel inclined toward the spinneret hole along the air flow direction.

Preferably, in the above melt blowing nozzle structure, there are two nozzle side blocks and they are arranged symmetrically on both sides of the nozzle middle block.

Preferably, in the above-mentioned melt blowing nozzle structure, the inner recesses of the side blocks are provided on the two nozzle side blocks.

Preferably, in the above-mentioned melt blowing nozzle structure, the cross section of the nozzle edge block is a ring structure, and the nozzle middle block is located in the middle hole of the ring structure.

Preferably, in the above melt blowing nozzle structure, the inner recess of the side block is an annular groove provided on the lower surface of the nozzle side block near the air outlet end.

Preferably, in the above melt-blown nozzle structure, the inner side of the side block is a curved surface;

The inner surface of the side block is the inner concave surface of the inner concave part of the side block.

Preferably, in the above-mentioned meltblown nozzle structure, the inner surface of the side block is a curved surface;

The value range of the lateral distance w between the center of the curved surface on the inner surface of the side block and the airflow channel is 5mm-20mm;

The value range of the longitudinal distance h between the center of the curved surface on the inner surface of the side block and the airflow channel is 10mm-30mm;

The value range of the radius r of the inner surface of the side block is 11.2mm-36.1mm.

Preferably, in the above-mentioned melt blowing nozzle structure, the value range of the airflow angle of the airflow channel is 60°±15°;

The value range of the outlet width e of the airflow channel is 0.6mm±0.1mm;

The value range of the spinneret diameter c of the spinneret hole is 0.3mm ± 0.1mm;

The lateral distance d between the spinneret hole and the airflow channel is 0.9mm±0.1mm.

It can be seen from the above technical solution that the melt blown nozzle structure provided by the present invention stretches the melt extruded from the spinneret hole after the air flow is ejected from the air flow channel during the melt blown process. The inner recess of the side block provided on the lower surface of the nozzle side block close to the air outlet end makes the nozzle side block form a diversion area, that is, the air flow is guided at the inner recess of the side block after being ejected from the air flow channel, effectively reducing the size of the spinneret holes. The probability of forming a gas recirculation zone near the exit of the spinneret hole makes the gas flow field near the spinneret hole more conducive to the stretching of the melt, and thus can effectively reduce the diameter of the melt-blown fiber without increasing energy consumption, so that On the basis of not changing the diameter of the spinneret hole, finer fibers are obtained, which effectively saves costs.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the schematic diagram of the front view structure of the meltblown nozzle structure provided by the embodiment of the present invention;

Fig. 2 is a schematic diagram of the dimensions of the meltblown nozzle structure provided by the embodiment of the present invention.

Detailed ways

The invention discloses a melt-blown nozzle structure to reduce the diameter of melt-blown fibers and save production costs.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1, the embodiment of the present invention provides a melt-blown nozzle structure, including a nozzle middle block 3 and a nozzle side block 4, the nozzle middle block 3 is provided with a spinneret hole 1; the nozzle side block 4 is arranged on the nozzle middle block 3. On the outer side, an air flow channel 2 is formed between the nozzle side block 4 and the nozzle middle block 3, and the lower surface of the nozzle side block 4 near the air outlet end has an inner recess 5 of the side block.

In the melt-blowing nozzle structure provided by the embodiment of the present invention, during the melt-blowing process, after the air flow is ejected from the air flow channel 2, the melt extruded from the spinneret hole 1 is stretched. Because the side block inner recess 5 provided on the lower surface of the nozzle side block 4 close to the air outlet end makes the nozzle side block 4 form a diversion area, that is, the air flow is guided at the side block inner recess 5 after being ejected from the air flow channel 2, effectively The probability of forming a gas recirculation zone near the outlet of the spinneret hole 1 is reduced, and the gas flow field near the spinneret hole 1 is more conducive to the stretching of the melt, thereby effectively reducing the energy consumption without increasing the energy consumption. The diameter of the melt-blown fibers is adjusted so that finer fibers can be obtained without changing the diameter of the spinneret hole 1, which effectively saves production costs.

Wherein, the melt extruded from the spinneret hole 1 may be polymer melt or other types of melt, which is not specifically limited here.

Further, the outer wall 7 of the air flow channel intersects the inner side 6 of the side block. Among them, the outer wall 7 of the air flow channel is the side wall of the nozzle edge block 4 facing the nozzle middle block 3 and is used to form the air flow channel 2; Through the above arrangement, only the angle formed between the outer wall 7 of the air flow channel and the inner side 6 of the side block exists between the outlet of the air flow channel 2 and the inner side 6 of the side block. Theoretically, the minimum distance between the outer wall 7 of the airflow channel and the inner recess 5 of the side block is zero. Through the above arrangement, the effect of guiding the airflow at the inner recess 5 of the side block after being sprayed out from the airflow channel 2 is effectively improved, thereby effectively improving the effect of guiding the flow.

Preferably, the air flow channel 2 is an inclined channel inclined toward the spinneret hole 1 along the air flow direction. Through the above arrangement, the airflow flowing out along the airflow channel 2 is sprayed onto the melt at a certain oblique angle, which effectively improves the stretching effect.

It is also possible to make the air flow channel 2 a parallel channel parallel to the spinneret hole 1 along the air flow direction, which will not be described in detail here and is within the scope of protection.

In the first embodiment, there are two nozzle side blocks 4 and they are symmetrically arranged on both sides of the nozzle middle block 3 . It can be seen from this that the number of air flow passages 2 is also two, and they are arranged symmetrically on both sides of the middle block 3 of the nozzle.

In the above embodiment where the air flow channels 2 are inclined channels, the two air flow channels 2 approach the spinneret hole 1 along the air flow direction, forming a slot shape, so as to further improve the drawing effect.

In this embodiment, two nozzle side blocks 4 are provided with side block inner recesses 5 . Through the above settings, the uniformity of flow diversion is ensured, thereby ensuring the uniformity of stretching of the melt, and effectively improving product quality.

In the second embodiment, the nozzle edge block 4 has a ring structure in cross section, and the nozzle middle block 3 is located in the middle hole of the ring structure. In this embodiment, the nozzle middle block 3 is sleeved in the middle of the nozzle side block 4, so that an air flow channel 2 with a circular cross section is formed between the nozzle middle block 3 and the nozzle side block 4, and the melt jetted from the spinneret hole 1 The body is located in the middle of the air flow channel 2, and after the air flow is ejected from the air flow channel 2, the melt is stretched uniformly along the circumferential direction of the melt.

In this embodiment, the inner concave portion 5 of the side block is an annular groove provided on the lower surface of the nozzle side block 4 near the gas outlet end. Through the above setting, the uniformity of the flow guide is further ensured.

In order to further ensure the diversion effect and improve the smoothness of gas diversion in the inner concave portion 5 of the side block, the inner side surface 6 of the side block is a curved surface; the inner side surface 6 of the side block is the inner concave surface of the inner concave portion 5 of the side block. The inner surface 6 of the side block can also be set as a corrugated surface composed of multiple planes or a combined surface formed by combining planes and curved surfaces.

As shown in FIG. 2 , for the convenience of setting, preferably, the inner surface 6 of the side block is a curved surface of an arc.

Wherein, the value range of the lateral distance w between the center of the curved surface of the inner side 6 of the side block and the airflow channel 2 is 5mm-20mm; The range is 10mm-30mm; the value range of the radius r of the inner surface 6 of the side block is 11.2mm-36.1mm.

Further, the value range of the airflow angle of the airflow channel 2 is 60°±15°; the value range of the outlet width e of the airflow channel 2 is 0.6mm±0.1mm; the spinneret hole diameter c of the spinneret hole 1 is The value range is 0.3mm±0.1mm; the lateral distance d between the spinneret hole 1 and the airflow channel 2 is 0.9mm±0.1mm.

Wherein, the included angle of the airflow is the included angle of the jetted airflow relative to the airflow channel part arranged on both sides of the middle block 3 of the nozzle. In the first embodiment, the airflow angle is the angle between two airflow channels 2 . In the second embodiment, the included airflow angle is the taper of the airflow channel 2 .

Example 1

The melt is extruded from the spinneret hole 1, and the high-speed and high-temperature gas is ejected from the air flow channel 2, and the melt extruded from the spinneret hole 1 is stretched.

In this embodiment, the airflow angle of the airflow channel 2 is 60°, the outlet width e of the airflow channel 2 is 0.6mm, the spinneret hole diameter c is 0.3mm, and the lateral distance between the spinneret hole 1 and the airflow channel 2 is d is 0.9 mm.

Wherein, the lateral distance w=10mm between the center of the curved surface of the inner side of the side block 6 and the airflow channel 2, the longitudinal distance h=20mm between the center of the curved surface of the inner side of the side block 6 and the air flow channel 2, the inner side of the side block 6 Radius r = 22.4 mm.

In this embodiment, the melt is polypropylene, the melt flow rate is 100g/10min, the flow rate is 0.008g/s, the initial temperature is 290°C, the gas pressure is 450kPa, and the initial gas temperature is 330°C.

Under the above conditions, the average diameter of the fibers produced by the melt-blown nozzle structure with the inner concave part 5 of the side block is 757nm, while the average diameter of the fiber obtained by the melt-blown nozzle structure without the inner concave part 5 of the side block is 757nm under the same conditions. 1.74 μm. It can be seen that the fiber diameter is reduced by 56.5% after the inner concave part 5 of the side block is provided on the lower surface of the nozzle side block 4 near the air outlet end.

Example 2

The melt is extruded from the spinneret hole 1, and the high-speed and high-temperature gas is ejected from the air flow channel 2, and the melt extruded from the spinneret hole 1 is stretched.

In this embodiment, the airflow angle of the airflow channel 2 is 60°, the outlet width e of the airflow channel 2 is 0.6mm, the spinneret hole diameter c is 0.3mm, and the lateral distance between the spinneret hole 1 and the airflow channel 2 is d is 0.9 mm.

Wherein, the lateral distance w=10mm between the center of the curved surface of the inner side of the side block 6 and the airflow channel 2, the longitudinal distance h=30mm between the center of the curved surface of the inner side of the side block 6 and the air flow channel 2, the inner side of the side block 6 Radius r = 31.6 mm.

In this embodiment, the melt is polypropylene, the melt flow rate is 800g/10min, the flow rate is 0.031g/s, the initial temperature is 280°C, the gas pressure is 550kPa, and the initial gas temperature is 300°C.

Under the above conditions, the average diameter of the fibers produced by the melt-blown nozzle structure with the inner concave part 5 of the side block is 529nm, while the average diameter of the fiber obtained by the melt-blown nozzle structure without the inner concave part 5 of the side block is 529nm under the same conditions. 1.18 μm. It can be seen that the fiber diameter is reduced by 55.2% after the inner recess 5 of the side block is provided on the lower surface of the nozzle side block 4 near the air outlet end.

Example 3

The melt is extruded from the spinneret hole 1, and the high-speed and high-temperature gas is ejected from the air flow channel 2, and the melt extruded from the spinneret hole 1 is stretched.

In this embodiment, the airflow angle of the airflow channel 2 is 60°, the outlet width e of the airflow channel 2 is 0.6mm, the spinneret hole diameter c is 0.3mm, and the lateral distance between the spinneret hole 1 and the airflow channel 2 is d is 0.9 mm.

Wherein, the lateral distance w=5mm between the center of the curved surface of the inner side of the side block 6 and the airflow channel 2, the longitudinal distance h=10mm between the center of the curved surface of the inner side of the side block 6 and the air flow channel 2, the inner side of the side block 6 Radius r = 11.2 mm.

In this embodiment, the melt is polypropylene, the melt flow rate is 75g/10min, the flow rate is 0.006g/s, the initial temperature is 310°C, the gas pressure is 450kPa, and the initial gas temperature is 380°C.

Under the above conditions, the average diameter of the fibers produced by the melt-blown nozzle structure with the inner concave part 5 of the side block is 915nm, while the average diameter of the fiber obtained by the melt-blown nozzle structure without the inner concave part 5 of the side block is 915nm under the same conditions. 1.91 μm. It can be seen that the fiber diameter is reduced by 52.1% after the inner recess 5 of the side block is provided on the lower surface of the nozzle side block 4 near the air outlet end.

Example 4

The melt is extruded from the spinneret hole 1, and the high-speed and high-temperature gas is ejected from the air flow channel 2, and the melt extruded from the spinneret hole 1 is stretched.

In this embodiment, the airflow angle of the airflow channel 2 is 60°, the outlet width e of the airflow channel 2 is 0.6mm, the spinneret hole diameter c is 0.3mm, and the lateral distance between the spinneret hole 1 and the airflow channel 2 is d is 0.9 mm.

Wherein, the transverse distance w=20mm between the center of the curved surface of the inner side of the side block 6 and the airflow channel 2, the longitudinal distance h=20mm between the center of the curved surface of the inner side of the side block 6 and the air flow channel 2, the inner side of the side block 6 Radius r = 28.3 mm.

In this embodiment, the melt is polypropylene, the melt flow rate is 800g/10min, the flow rate is 0.057g/s, the initial temperature is 280°C, the gas pressure is 500kPa, and the initial gas temperature is 290°C.

Under the above conditions, the average diameter of the fibers produced by the melt-blown nozzle structure with the inner concave part 5 of the side block is 635nm, while the average diameter of the fiber obtained by the melt-blown nozzle structure without the inner concave part 5 of the side block is 635nm under the same conditions. 1.62 μm. It can be seen that the fiber diameter is reduced by 60.8% after the inner recess 5 of the side block is provided on the lower surface of the nozzle side block 4 near the air outlet end.

Example 5

The melt is extruded from the spinneret hole 1, and the high-speed and high-temperature gas is ejected from the air flow channel 2, and the melt extruded from the spinneret hole 1 is stretched.

In this embodiment, the airflow angle of the airflow channel 2 is 60°, the outlet width e of the airflow channel 2 is 0.6mm, the spinneret hole diameter c is 0.3mm, and the lateral distance between the spinneret hole 1 and the airflow channel 2 is d is 0.9 mm.

Wherein, the lateral distance w=20mm between the center of the curved surface of the inner side of the side block 6 and the airflow channel 2, the longitudinal distance h=30mm between the center of the curved surface of the inner side of the side block 6 and the air flow channel 2, the inner side of the side block 6 Radius r = 36.1 mm.

In this embodiment, the melt is polypropylene, the melt flow rate is 1000g/10min, the flow rate is 0.022g/s, the initial temperature is 290°C, the gas pressure is 500kPa, and the initial gas temperature is 310°C.

Under the above conditions, the average diameter of the fibers produced by the melt-blown nozzle structure with the inner recess 5 of the side block is 451nm, while the average diameter of the fiber obtained by the melt-blown nozzle structure without the inner recess 5 of the side block is 451nm under the same conditions. 1.02 μm. It can be seen that the fiber diameter is reduced by 55.8% after the inner recess 5 of the side block is provided on the lower surface of the nozzle side block 4 near the air outlet end.

From the above, it can be known that the diameter of the prepared fiber in the melt-blown nozzle structure provided by the embodiment of the present invention is more than 52% smaller than the diameter of the fiber prepared by the melt-blown nozzle structure without the inner concave part 5 of the side block, reaching the nanometer scale.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. a kind of melt-blowing nozzles structure characterized by comprising

Nozzle intermediate mass (3) is provided with spinneret orifice (1) on the nozzle intermediate mass (3)；

The nozzle side block (4) being set on the outside of the nozzle intermediate mass (3), nozzle side block (4) and the nozzle intermediate mass (3) airflow channel (2) are formed between, nozzle block inner fovea part when block (4) have close to the lower surface of air-flow outlet side (5)。

2. melt-blowing nozzles structure according to claim 1, which is characterized in that airflow channel outer wall (7) and side block medial surface (6) intersect；

The airflow channel outer wall (7) is that nozzle side block (4) towards the nozzle intermediate mass (3) and is used to form the gas The side wall of circulation road (2)；

The inner concave of the block inner fovea part (5) when block medial surface (6) are described.

3. melt-blowing nozzles structure according to claim 1, which is characterized in that the airflow channel (2) is along airflow direction To the spinneret orifice (1) inclined ramp way.

4. melt-blowing nozzles structure according to claim 1, which is characterized in that the quantity of nozzle side block (4) is two And it is symmetrically disposed on the two sides of the nozzle intermediate mass (3).

5. melt-blowing nozzles structure according to claim 4, which is characterized in that be respectively provided on two nozzle side blocks (4) There is the side block inner fovea part (5).

6. melt-blowing nozzles structure according to claim 1, which is characterized in that the cross section of nozzle side block (4) is ring Shape structure, the nozzle intermediate mass (3) are located in the interstitial hole of the ring structure.

7. melt-blowing nozzles structure according to claim 6, which is characterized in that the side block inner fovea part (5) is is set to Nozzle side block (4) is stated close to the annular groove of the lower surface of air-flow outlet side.

8. melt-blowing nozzles structure according to claim 1, which is characterized in that side block medial surface (6) is curved surface；

The inner concave of the block inner fovea part (5) when block medial surface (6) are described.

9. melt-blowing nozzles structure according to claim 8, which is characterized in that the side block medial surface (6) is circular arc camber；

The value range of lateral distance w between the curved surface center of circle and the airflow channel (2) of the side block medial surface (6) is 5mm-20mm；

The value range of fore-and-aft distance h between the curved surface center of circle and the airflow channel (2) of the side block medial surface (6) is 10mm-30mm；

The value range of the radius r of the side block medial surface (6) is 11.2mm-36.1mm.

10. -9 described in any item melt-blowing nozzles structures according to claim 1, which is characterized in that the gas of the airflow channel (2) The value range for flowing angle is 60 ° ± 15 °；

The value range of the exit width e of the airflow channel (2) is 0.6mm ± 0.1mm；

The value range of the orifice diameter c of the spinneret orifice (1) is 0.3mm ± 0.1mm；

Lateral distance d between the spinneret orifice (1) and the airflow channel (2) is 0.9mm ± 0.1mm.