JPS6147860A - Apparatus for producing nonwoven fabric - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is an apparatus for producing nonwoven fabric using the spunbond method. Regarding the structure.

Conventional technology As a manufacturing method for non-woven fabric, spun filaments are scattered through a separator to form a random web on a collection mesh belt running downward, and this is subjected to bath melt twisting etc. using a hot roller to obtain a non-woven fabric. The spunbond method is being traced.

The uniformity of the product expected from this method is greatly affected by the process of spreading and dispersing the fibers and distributing and depositing them on the fruit. There was something like this:

That is, a method of opening and dispersing fibers from a separator and scattering them onto the collection surface of a collection mesh belt;
A method of providing a reflector on the downstream side of the separator to restrict the falling position to the collection surface, a method of providing a swinging device under the separator and swinging the fiber group at right angles to the traveling direction of the mesh belt or at a certain angle, etc. It is.

Problems with the Prior Art However, each of these conventional methods has the following drawbacks. In other words, if the first method is used, the occurrence of thread clumps is small, but since uniformity in the dispersion width of each fiber group is required, if there is variation in the dispersion width, a vertical striped pattern will occur, and If there is variation in the wind speed among each fiber group, the fiber group in contact with it tends to be attracted to the larger side of the speed box.In the second method, the dispersed fibers are placed on the collection surface. When falling, it vibrates and tends to cause fine fascia and formations on the %A product in parallel to the direction in which the reflectors are arranged. Furthermore, the strength of the third method is limited, making it unsuitable for high-speed molding, and mutual interference between fiber groups occurs during rocking, resulting in thread clumps on the collecting surface, which impairs the appearance. .

Means for Solving the Problem In order to eliminate these drawbacks of the prior art (as a result of various studies, the inventor of the present invention proposed a pair of reflective dispersion plates curved in an arc between the separator and the collecting mesh belt, which are opened by the separator). It has been found that when the dispersed fibers pass through the reflective dispersion plate, they are reopened and dispersed, and a uniform nonwoven fabric can be obtained.

Based on this knowledge, the present invention provides an apparatus for dispersing ta fibers spun from a separator to form a random web on a collecting mesh belt running below. A pair of reflective dispersion films curved in an arc shape are provided facing each other, and the gap between the two is narrowed in the middle part and widened on the upstream and downstream sides.

This will be explained with reference to the drawings. Fig. 1 is a schematic diagram of the present apparatus, in which a pair of arcuate reflection dispersion plates 3 and 3 are arranged between a separator 1 and a mesh belt 2, which blow out spun fibers and spread and disperse them. 3' are arranged facing each other, and the gap between the two is widened on the upstream and downstream sides as shown in the figure, and narrowed in the middle part, and the fibers scattered from the separator 1 pass through the reflective dispersion plate. 3
．． 1, the fibers are refibered and dispersed, and are deposited in a folded state on a collection mesh belt 2 running in the direction of the arrow to form a random web 5. The random web 5 is then subjected to heat i, i! by the heat roller 7. kM8 and the nonwoven fabric 6 is manufactured.

The reflection dispersion plates 3, 3' may be made of a rigid body and fixed at a fixed position, but preferably they are made of a flexible elastic body such as a leaf spring so that the degree of curvature can be adjusted. Alternatively, the opening angle can be changed so that the gap on the inlet side or the outlet side can be adjusted, and particularly preferably, both the curvature and the opening angle can be adjusted.

FIG. 2 shows an example of this, in which a support 10 is rotatably supported by shafts 9 and v on a bracket (not shown).
10' is attached to the above-mentioned bracket from a bolt at an appropriate position in the elongated hole 11 at its upper end by a link 13 and a pin 14 with an axis M76, and when the bolt 12 is loosened and the bolt 12 is fitted into the elongated hole. (support by moving the link 13) 10.10 Of course, the opening angle of the upper side can be adjusted by rotating in the direction of the arrow with the axis 9 and te as a fulcrum.

Support 10.101 also includes a pair of clamps 15%1
5' is attached to one side, 15 is attached to the lower end, and 15' is attached to the upper side with bolts 16% and 16', respectively.
6' is designed to be slidably fitted into the elongated hole 17 so that the vertical position can be adjusted to rJII. The upper and lower chain portions of the flexible reflective dispersion plate 3, 3' are fixed to each clamp 15, respectively.

Therefore, the reflection dispersion plate 3, γ is the upper clamp 15% 1
By adjusting the position of 5' up and down by l, the 9 degree of curvature is changed by /4ig, and by loosening the bolt 12 and moving the link 13 in the lateral direction, the opening angle on the upstream side can be adjusted.

According to this apparatus, the position and shape of the reflection dispersion plate can be optimally adjusted in accordance with various manufacturing conditions such as the type of fibers used and the manufacturing speed of the nonwoven fabric.

Example: A pair of reflective dispersion plates A with a curvature, soom, and a height of 500 mm were installed on the downstream side of the separator, and a pair of reflective dispersion plates A were installed on the fiber inlet side. .

The polypropylene fibers spun from a nozzle with 100 holes arranged with a gap of 605 m in the middle part and 120 feet on the outlet side are placed in a high-speed airflow indexing device (ejector and guide tube) with an inner diameter of 10 mm at the outlet. After indexing at a speed of 3000 s/min, the fibers were defibrated and dispersed using a separator, passed between the reflective dispersion plates to be re-fibrillated, and deposited on a collection mesh conveyor to produce a web.

Comparative Examples 1 and 2 A pair of straight reflective dispersion plates B with a height of 500mm were installed on the downstream side of the separator, 120mm on the inlet side and 80mm on the outlet side.
A web was manufactured by disposing the fibers with gaps between them and depositing them on a mesh conveyor for supplementary use through the fibers dispersed from the separator under the same conditions as in the above example. Further, under the same conditions as in the example, the fibers were directly spread onto the collection mesh conveyor from the separator and deposited to produce a web. The following table shows the rate of variation in the basis weight (weight per unit area) of the webs obtained in the above Examples and Comparative Examples 1 and 2.

Here, the variation rate of the basis weight of each part of the web is as follows: X: Weight per unit area of each part (g/d) X: ffi of each part
Average value of quantity N: total number of measurement points As is clear from Table 1, the uniformity of the basis weight is measured by using a reflective dispersion plate which is curved in an arc shape with a narrowed middle part.

Effects of the Invention As described above, the device of the present invention has a simple configuration in which a reflective dispersion cloth curved in an arc is placed on the downstream side of the separator, thereby suppressing the occurrence of unevenness in the thickness and thinness of the pattern of the nonwoven fabric. A well-proportioned product can be obtained.

Kukai Kuni +! j *Explanation FIG. 1 is a schematic diagram of a manufacturing equipment according to the present invention, and FIG. 2 is a schematic diagram showing a mounting structure of a reflection dispersion plate.

Claims (3)

[Claims] (1) In a device that spreads and disperses the protected fibers through a separator and forms a random web on a collection mesh belt running downstream, the gap is narrowed by squeezing the intermediate part between the separator and the mesh belt. , a nonwoven fabric manufacturing device in which a pair of reflective dispersion plates curved in an arc shape with widened gaps on the upstream and downstream sides are arranged to reweave and disperse fibers. (2) A pair of reflective dispersion plates curved in an arc with a narrow gap in the middle and a wide gap on the upstream and downstream sides are arranged downstream of the separator, and the spun fibers are spread and dispersed by the separator. After that, it is passed between reflective dispersion plates to re-distribute the fibers,
A device for producing a nonwoven fabric in which at least one of the degree of curvature and the opening angle of the reflective dispersion plate can be adjusted in a device that forms a random web on a mesh belt for guidance running on the downstream side. (3) The nonwoven fabric manufacturing apparatus according to claim 2, wherein the reflection dispersion plate has an upper end and a lower end attached to an attached support, and one of them is adjustable in position.