JPH02462B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a fiber opening mechanism for scattering fibers from a separator onto a collecting mesh belt in a spunbond nonwoven fabric manufacturing apparatus to form a uniform random web. Prior art As a manufacturing method for non-woven fabric, a spun filament is spread through a separator to form a random web on a collecting mesh belt running below, and this is melted and bonded with a hot roller to obtain a non-woven fabric. The bond method is known.
The uniformity of the product obtained by this method is greatly influenced by the process of opening and dispersing the fibers and depositing them on the collection surface. Ta. That is,
A method of opening and dispersing the fibers from a separator and letting them fall directly onto the collection surface of a collection mesh belt, a method of installing a reflective plate at the bottom of the separator and regulating the position of the fibers falling onto the collection surface, a method under the separator. For example, a rocking device is provided at the mesh belt, and the fiber group is rocked at right angles to the traveling direction of the mesh belt or at a certain angle. Problems with the Prior Art However, each of these conventional methods has the following drawbacks. In other words, in the first method, the occurrence of thread clumps is small, but uniformity in the dispersion width of each fiber group is required, so if there is variation in the dispersion width, unevenness in thickness and thinness of a vertical striped pattern will occur. If there are variations in wind speed in each fiber group,
In the second method, the dispersed fibers vibrate as they fall onto the collection surface, causing the product to move in the direction in which the reflectors are arranged. The problem is that fine stripes are likely to occur parallel to the surface. Furthermore, in the third method, it is necessary to increase the number of oscillations of the oscillating device according to the traveling speed of the collection mesh belt, but the oscillating device is not suitable for high-speed molding due to its strength. , Mutual interference of fiber groups occurs during rocking, and thread clumps occur on the collection surface, impairing the appearance. Furthermore, when trying to change the width of nonwoven fabrics produced by these methods, large-scale measures such as adjusting the blowing direction of the separator, changing the mounting position of the reflector, or changing the amplitude of the swinging device are required. Yes, or require delicate and complex adjustments. Means for Solving the Problems As a result of repeated research in order to eliminate these drawbacks of the prior art, the present inventor has devised an arc-shaped structure between the separator and the collecting mesh belt with blades attached to the outlet. A pair of reflective plates are placed facing each other,
If the gap between both reflectors is narrowed in the middle, widened on the downstream side, and further narrowed at the wing pieces, the fibers that have been opened and dispersed by the separator will be reopened and dispersed as they pass between the reflectors, creating a symmetrical shape. The fact that non-woven fabric can be manufactured, the wing pieces can be made into variable wings, and the spacing between the variable wings can be changed.
It was discovered that the width of the nonwoven fabric can be changed. The present invention was made based on this knowledge, and the spun fibers are spread and dispersed using a separator,
In an apparatus for forming a random web on a collection mesh belt running on the downstream side, a pair of reflective dispersion plates curved in an arc is arranged between the separator and the mesh belt so that the distance between them narrows in the middle. The first feature is that the blades are arranged at the ends of the blades, narrowing the gap on the outlet side, and the second feature is that the gap on the outlet side can be adjusted by using variable blades. This is a characteristic feature. To explain this with the help of drawings, Fig. 1 is a schematic diagram of the present device, in which a variable blade 3 whose angle can be adjusted is provided at the lower end between a separator 1 that blows out spun fibers and spreads and disperses them, and a mesh belt 2. A pair of reflection dispersion plates 4, 4' curved in an arc shape having a diameter of 3' are arranged facing each other, and the gap between them is widened at the upstream and downstream sides and narrowed at the middle part, as shown in the figure. The fibers scattered from the separator 1 pass between the reflective dispersion plates 4 and 4', where they are re-dispersed and deposited in a folded state on the collection mesh belt 2 running in the direction of the arrow. A random web 5 is formed. The random web 5 is then thermally fused using a heat roller 7 to produce a nonwoven fabric 6. Figure 2 shows the mounting structure of the reflection dispersion plate.
A pair of supports 11, 1 supported at appropriate angles
1' has clamps 12, 1 at the upper and lower ends of each
2' are attached by bolts 13, and each clamp 12, 12' is configured to fix the upper and lower ends of the reflection dispersion plates 4, 4', and the clamp 12 at the lower end
has blades 3 and 3' extending downward, and by loosening a bolt 13, the mounting angle can be adjusted, and therefore the distance between the blades can be adjusted. Example: A pair of reflective dispersion plates with a curvature of 800 mm and a height of 500 mm are installed on the lower side of the separator, 120 mm on the fiber entrance side, and the middle part
60mm and 120mm on the outlet side, and variable blades are attached to the lower end of each dispersion plate to make the blade spacing at the tip 70mm, and the polypropylene fiber group spun from a nozzle with 100 holes is excluded. Using a high-speed airflow indexing device (ejector and guide tube) with an outlet inner diameter of 10 mm
After indexing at a speed of 3000 mm, the fibers were opened and dispersed using a separator, and then passed between the reflective dispersion plate and the variable blades for re-fibrillation and dispersion, and deposited on a collecting mesh conveyor to produce a web. Comparative Example 1 The same equipment as in the example was used except that the variable vane was not provided at the lower end of the reflection-dispersion plate, and the fiber group dispersed from the separator was passed between the reflection-dispersion plates and collected under the same conditions as in the example. The web was produced by depositing it on a mesh conveyor. Comparative Example 2 A pair of straight reflective dispersion plates with a height of 500 mm are installed on the downstream side of the separator, 120 mm on the inlet side and 120 mm on the outlet side.
The fibers were arranged at an interval of 80 mm, and the fibers dispersed from the separator were passed through the separator under the same conditions as in the above example, and deposited on a collection mesh conveyor to produce cormorant. Comparative Example 3 A web was produced by directly scattering fibers from a separator onto a collection mesh conveyor and depositing them under the same conditions as in Example. The rate of variation in basis weight (weight per unit area) of the webs obtained in Examples and Comparative Examples 1, 2, and 3 was measured. The results are shown in the table below.

[Table] Here, the month and date fluctuation rates for various parts of the web were calculated as follows. X : Weight per unit area of each location (g/cm ² ) By further narrowing the side fiber channels, uniformity could be dramatically improved. Next, the variable blade of the above example was moved to change the tip spacing X to 35 mm, 50 mm, and 70 mm, and the rate of change in the width of the deposited web was measured. The results are shown in Table 2. Note that even when the variable blades were moved in the manner described above, the uniformity of the basis weight was not impaired.

[Table] As is clear from the results in Table 2, the width of the deposited web can be changed by changing the spacing between the variable blades.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a manufacturing apparatus according to the present invention, and FIG. 2 is a front view of the main parts of the same apparatus. 1...Separator, 2...Mesh belt,
3, 3'...Variable blade, 4, 4'...Reflection dispersion plate, 5
...Web, 6...Nonwoven fabric.

Claims (1)

[Scope of Claims] 1. In a device that spreads and disperses spun fibers from a separator to form a random web on a collection mesh belt running downstream, blades are attached at the outlet between the separator and the mesh belt. A pair of reflective dispersion plates curved in an arc shape are arranged facing each other, and both reflection dispersion plates are once narrowed in the middle, then widened toward the downstream side, and then narrowed further by the wing pieces. Nonwoven fabric manufacturing equipment. 2 In a device that spreads and disperses spun fibers from a separator to form a random web on a collection mesh belt running downstream, a pair of arcuate curved blades with variable blades attached to the outlet is installed between the separator and the mesh belt. A nonwoven fabric manufacturing device in which reflective dispersion plates are arranged facing each other and the interval between outlets can be adjusted by moving variable blades.