Coaxial melt-blowing spinning assembly

Abstract

The utility model discloses a coaxial melt-blowing spinning assembly, and particularly relates to the technical field of non-woven material production equipment, the coaxial melt-blowing spinning assembly comprises a spinneret plate, a spinneret pipe, an inner air plate and an outer air plate which are fixedly connected in sequence, a melt distribution cavity and an air inlet channel are formed in the spinneret plate, an inlet of the melt distribution cavity is communicated with a melt channel, and an outlet of the melt distribution cavity is communicated with an air outlet of the outer air plate. One end of the spinneret pipe is communicated with the melt distribution cavity, the other end of the spinneret pipe sequentially penetrates through the inner air plate and the outer air plate to be communicated with the outside, the inner air plate is provided with a plurality of air communication holes penetrating through the inner air plate, the outer air plate is provided with a plurality of traction air channels penetrating through the outer air plate, and the two ends of the air communication holes are communicated with the air inlet channel and the traction air channels respectively. One traction gas channel is sleeved outside one spinneret pipe, the shape of the cross section of the traction gas channel is the same as that of the cross section of the spinneret pipe sleeved with the traction gas channel, and the central axis of the traction gas channel and the central axis of the spinneret pipe are collinear. According to the utility model, the uniformity and stability of fibers can be improved, and the performance of the fibers is more excellent.

Description

Technical Field

[0001] The utility model relates to the technical field of nonwoven material production equipment, in particular to a coaxial melt-blown spinning component. Background Art

[0002] The meltblown spinning assembly is one of the key components in meltblown technology and plays a vital role in the quality and performance of meltblown products. The meltblown spinning assembly determines the diameter and distribution uniformity of the fiber. The control of the fiber diameter is a key parameter in the meltblown spinning process. Too large or too small a diameter will affect the performance of the product; the meltblown spinning assembly also affects the morphological structure of the fiber. The design and optimization of the meltblown spinning assembly can control the fiber to form different fiber structures; the meltblown spinning assembly also has a key influence on the surface quality and various functions of the meltblown product. By reasonably designing the assembly structure, the hygroscopicity, filtration and other performance of the fiber can be improved, thereby improving the overall quality of the product.

[0003] At present, the common structure of meltblown spinning components is as follows Figure 3 In the slit-type "air knife" drafting shown, the cross-section of the spinneret 8' is circular, hereinafter referred to as "air knife meltblowing". The drafting gas channel 9' of the "air knife meltblowing" forms an angle of 60° with the direction of the filament flow. When the melt leaves the hole of the meltblowing mold, the single strand of drafting gas takes away and refines the melt. This structure has some advantages. The "air knife meltblowing" structure is relatively simple, has a low manufacturing cost, and the process is easy to operate and control. However, this type of spinning assembly also has some disadvantages. The circular spinneret hole limits the morphology and structural diversity of the fiber, resulting in the inability to prepare fibers of certain special forms, limiting the innovation and functional expansion of the product; the slit-type "air knife" drafting uses two drafting airflows to draft the fibers ejected from all spinnerets, and it is impossible to accurately draft the fibers spun from each spinneret. The drafting uniformity and diameter control of the fibers are subject to certain limitations, and the product performance and quality stability need to be further improved. Utility Model Content

[0004] The utility model aims to provide a coaxial melt-blown spinning assembly to solve the problems existing in the above-mentioned prior art, and can improve the uniformity and stability of fibers, and the performance of the fibers is better.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a coaxial melt-blown spinning component, comprising a spinneret, a spinneret tube, an inner wind plate and an outer wind plate which are fixedly connected in sequence, wherein a melt distribution chamber and an air inlet channel are provided inside the spinneret, the inlet of the melt distribution chamber is connected with the melt channel, one end of the spinneret tube is connected with the melt distribution chamber, and the other end is connected with the outside through the inner wind plate and the outer wind plate in sequence, the inner wind plate is provided with a plurality of gas communication holes penetrating the inner wind plate, the outer wind plate is provided with a plurality of traction gas channels penetrating the outer wind plate, the two ends of the gas communication holes are respectively connected with the air inlet channel and the traction gas channel, one traction gas channel is sleeved outside one of the spinnerets, the cross-sectional shape of the traction gas channel is the same as the cross-sectional shape of the spinneret tube on which it is sleeved, and the central axis of the traction gas channel is colinear with the central axis of the spinneret tube.

[0007] Preferably, it further comprises a filter screen, wherein the filter screen is arranged at the inlet of the melt distribution chamber.

[0008] Preferably, the filter screen is made of metal.

[0009] Preferably, the mesh size of the filter is 150-360 meshes.

[0010] Preferably, a groove is provided on one side of the inner wind plate close to the outer wind plate, all the gas communication holes are connected to the bottom surface of the groove, and the opening of the groove is connected to all the traction gas channels.

[0011] Preferably, the inner air plate is further provided with a spinneret through hole for the spinneret to pass through, the outer wall of the spinneret is tightly fitted with the inner wall of the spinneret through hole, and the gas connecting holes are evenly distributed around the spinneret through hole.

[0012] Preferably, the cross-sectional shape of the spinneret is circular, "8"-shaped, three-leaf clover-shaped or four-leaf clover-shaped.

[0013] Preferably, the inner diameter of the spinneret is 0.15 mm to 0.6 mm.

[0014] Preferably, the distance between the central axes of two adjacent spinnerets is 0.80 mm to 3.20 mm.

[0015] Preferably, the cross-sections of two adjacent spinnerets have the same or different shapes.

[0016] Compared with the prior art, the utility model has achieved the following technical effects:

[0017] The utility model provides a coaxial melt-blown spinning component, the gas connecting holes opened on the inner wind plate can ensure that the traction gas in the air inlet channel can evenly enter the traction gas channel, thereby evenly stretching the melt; and the traction gas channel is sleeved outside the spinneret, the cross-sectional shape of the traction gas channel is the same as the cross-sectional shape of the spinneret, and the central axis of the traction gas channel is colinear with the central axis of the spinneret. By utilizing "coaxial melt-blowing", each spinneret can be accurately stretched, which is convenient for controlling the fiber diameter. Compared with traditional melt-blown spinning components, the fiber fineness uniformity is better, the product quality is more stable, and the performance is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the coaxial melt-blown spinning assembly of the utility model;

[0020] Figure 2 It is an enlarged view of a spinneret and a traction gas channel of the coaxial melt-blown spinning assembly of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the melt-blown spinning assembly of the prior art "air knife melt-blown";

[0022] Figure 4 It is a schematic diagram of a local area of ​​one end surface of the inner air plate of the coaxial melt-blown spinning assembly of the utility model;

[0023] Figure 5 is a cross-sectional view of the cloverleaf-shaped spinneret and the traction gas channel of Example 1;

[0024] Figure 6 is a schematic diagram of the end surface of the external wind plate of Example 1;

[0025] Figure 7 is a cross-sectional view of a four-leaf clover-shaped spinneret and a traction gas channel of Example 2;

[0026] Figure 8 is a schematic diagram of the end surface of the external wind plate of Example 2;

[0027] Fig. 9 is a cross-sectional view of the circular spinneret and the traction gas channel of Example 3;

[0028] Fig.10It is a cross-sectional view of the "8"-shaped spinneret and the traction gas channel of Example 3;

[0029] Fig.11 Schematic diagram of the end surface of the external wind plate of Example 3.

[0030] In the figure: 1-inlet of melt distribution chamber; 2-filter screen; 3-melt distribution chamber; 4-air inlet channel; 5-spinneret; 6-inner air plate; 7-outer air plate; 8, 8'-spinneret; 9, 9'-traction gas channel; 10-gas connecting hole. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The utility model aims to provide a coaxial melt-blown spinning assembly to solve the problems existing in the above-mentioned prior art, and can improve the uniformity and stability of fibers, and the performance of the fibers is better.

[0033] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] Example 1

[0035] This embodiment provides a coaxial melt-blown spinning assembly, such as Figure 1-2As shown, it includes a spinneret 5, a spinneret 8, an inner wind plate 6 and an outer wind plate 7 which are fixedly connected in sequence. A melt distribution chamber 3 and an air inlet channel 4 are provided inside the spinneret 5. The inlet 1 of the melt distribution chamber 3 is connected with the melt channel. One end of the spinneret 8 is connected with the melt distribution chamber 3, and the other end passes through the inner wind plate 6 and the outer wind plate 7 in sequence to be connected with the outside. The inner wind plate 6 is provided with a plurality of gas connecting holes 10 penetrating the inner wind plate 6, and the outer wind plate 7 is provided with a plurality of traction gas channels 9 penetrating the outer wind plate 7. Both ends of the gas connecting holes 10 are respectively connected with the air inlet channel 4 and the traction gas channel 9. A traction gas channel 9 is sleeved outside a spinneret 8. The cross-sectional shape of the traction gas channel 9 is the same as the cross-sectional shape of the spinneret 8, and the central axis of the traction gas channel 9 is colinear with the central axis of the spinneret 8. The polymer melt first enters the melt distribution chamber 3 from the melt channel, and the melt distribution chamber 3 can evenly distribute the polymer melt to multiple spinnerets 8. The gas connecting hole 10 opened in the inner wind plate 6 can ensure that the traction gas in the air inlet channel 4 can evenly enter the traction gas channel 9, thereby evenly stretching the melt; and the traction gas channel 9 is sleeved outside the spinneret 8, and the cross-sectional shape of the traction gas channel 9 is the same as the cross-sectional shape of the spinneret 8, and the central axis of the traction gas channel 9 is collinear with the central axis of the spinneret 8. By utilizing "coaxial melt blowing", the traction gas in the traction gas channel 9 can be ejected from the gap between the inner wall of the traction gas channel 9 and the outer wall of the spinneret 8, and the melt ejected from each spinneret 8 can be accurately stretched, which is convenient for controlling the fiber diameter. Compared with the traditional melt-blown spinning assembly, the fiber fineness uniformity is better, the product quality is more stable, and the performance is better.

[0036] It is further preferred in the implementation of this embodiment that the coaxial melt-blown spinning assembly also includes a filter screen 2, which is arranged at the inlet of the melt distribution chamber 3. The filter screen 2 is made of metal and can filter the melt to make the melt flow more evenly.

[0037] It is further preferred in the implementation manner of the present embodiment that a groove is provided on the side of the inner wind plate 6 close to the outer wind plate 7, all the gas connecting holes 10 are connected to the bottom surface of the groove, and the opening of the groove is connected to all the traction gas channels 9. The groove can provide a certain amount of space for storage and buffering of the traction gas flowing through a traction gas connecting hole 10, so that the traction gas distribution is more uniform.

[0038] In the implementation of this embodiment, it is further preferred that Figure 4 As shown, the inner air plate 6 also has a spinneret hole for the spinneret 8 to pass through, the outer wall of the spinneret 8 fits tightly with the inner wall of the spinneret hole, and gas connecting holes 10 are evenly distributed around the spinneret hole to evenly distribute the traction gas.

[0039] It is further preferred in the implementation manner of this embodiment that the shapes of the cross sections of two adjacent spinnerets 8 are the same or different and can be freely matched according to actual production requirements.

[0040] In the implementation of this embodiment, it is further preferred that the mesh number of the filter screen 2 is 180 meshes. Figure 5-6 As shown, four rows of spinnerets 8 with clover-shaped cross-sections and traction gas channels 9 are provided on the outer wind plate 7, the inner diameter (maximum distance) of the spinneret 8 is 0.25 mm, the melt output of each spinneret 8 is 0.25 g / min, and the center distance between two adjacent spinnerets 8 is 2.10 mm.

[0041] Example 2

[0042] This embodiment provides a coaxial melt-blown spinning assembly. The difference from the coaxial melt-blown spinning assembly of embodiment 1 is that the mesh number of the filter screen 2 is 200 meshes. Figure 7-8 As shown, a row of spinnerets 8 with a four-leaf clover-shaped cross-section and a traction gas channel 9 are provided on the outer wind plate 7, the inner diameter (maximum distance) of the spinneret 8 is 0.30 mm, the melt output of each spinneret 8 is 0.40 g / min, and the center distance between two adjacent spinnerets 8 is 2.20 mm.

[0043] Example 3

[0044] This embodiment provides a coaxial melt-blown spinning assembly, which is different from the coaxial melt-blown spinning assembly of embodiment 1 in that Figure 9-11As shown, three rows of spinnerets 8 with different cross-sectional shapes and traction gas channels 9 are provided on the outer air plate 7, wherein the cross-sectional shapes of the spinnerets 8 in the first row include circular, "8"-shaped, three-leaf clover-shaped or four-leaf clover-shaped, wherein: the inner diameter (maximum distance) of the circular spinneret 8 is 0.30 mm, the melt discharge amount of each spinneret 8 is 0.50 g / min, and the center spacing of the spinnerets 8 is 1.20 mm; the inner diameter (maximum distance) of the "8"-shaped spinneret 8 is 0.50 mm, and each spinneret 8 The melt output is 0.80g / min, and the center spacing of the spinneret 8 is 1.60mm; the inner diameter (maximum distance) of the clover-shaped spinneret 8 is 0.25mm, the melt output of each spinneret 8 is 0.25g / min, and the center spacing of the spinneret 8 is 1.10mm; the inner diameter (maximum distance) of the four-leaf clover-shaped spinneret 8 is 0.30mm, the melt output of each spinneret 8 is 0.40g / min; the center spacing of two adjacent spinnerets 8 is 1.20mm. The cross-sectional shapes of the spinneret 8 are circular, "8"-shaped, clover-shaped or four-leaf clover-shaped, which can make the fiber morphology more diversified and the performance can also be improved: the fibers prepared by the special-shaped spinneret holes have unconventional cross-sectional shapes, and these special-shaped cross-sectional shapes can improve their performance, such as better strength, toughness, water absorption and water conduction performance, wear resistance, stronger dust holding and wiping performance, etc.

[0045] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A coaxial meltblown spinning assembly, characterized in that: It includes a spinneret, a spinneret, an inner wind plate and an outer wind plate which are fixedly connected in sequence, a melt distribution chamber and an air inlet channel are provided inside the spinneret, the inlet of the melt distribution chamber is connected with the melt channel, one end of the spinneret is connected with the melt distribution chamber, and the other end passes through the inner wind plate and the outer wind plate in sequence to be connected with the outside, the inner wind plate is provided with a plurality of gas connecting holes penetrating the inner wind plate, the outer wind plate is provided with a plurality of traction gas channels penetrating the outer wind plate, the two ends of the gas connecting holes are respectively connected with the air inlet channel and the traction gas channel, one traction gas channel is sleeved outside one of the spinnerets, the cross-sectional shape of the traction gas channel is the same as the cross-sectional shape of the spinneret on which it is sleeved, and the central axis of the traction gas channel is colinear with the central axis of the spinneret.

2. The coaxial melt-blown spinning assembly according to claim 1, characterized in that: It also includes a filter screen, which is arranged at the inlet of the melt distribution cavity.

3. The coaxial melt-blown spinning assembly according to claim 2, characterized in that: The filter screen is made of metal.

4. The coaxial melt-blown spinning assembly according to claim 2, characterized in that: The mesh number of the filter is 150-360 meshes.

5. The coaxial melt-blown spinning assembly according to claim 1, characterized in that: A groove is provided on one side of the inner wind plate close to the outer wind plate, all the gas communication holes are connected to the bottom surface of the groove, and the opening of the groove is connected to all the traction gas channels.

6. The coaxial melt-blown spinning assembly according to claim 1, characterized in that: The inner air plate is also provided with a spinneret through hole for the spinneret to pass through, the outer wall of the spinneret is tightly fitted with the inner wall of the spinneret through hole, and the gas connecting holes are evenly distributed around the spinneret through hole.

7. The coaxial melt-blown spinning assembly according to claim 1, characterized in that: The cross-sectional shape of the spinneret is circular, "8"-shaped, three-leaf clover-shaped or four-leaf clover-shaped.

8. The coaxial melt-blown spinning assembly according to claim 1, characterized in that: The inner diameter of the spinneret is 0.15 mm to 0.6 mm.

9. The coaxial melt-blown spinning assembly according to claim 1, characterized in that: The distance between the central axes of two adjacent spinnerets is 0.80 mm to 3.20 mm.

10. The coaxial melt-blown spinning assembly according to claim 1, characterized in that: The cross-sections of two adjacent spinning tubes may be the same or different in shape.

Images