JPH07216708A - Device for producing spun-bonded filament non-woven fabric - Google Patents

Abstract

PURPOSE:To provide the device for continuously producing a spunbonded filament non-woven fabric excellent in weave. CONSTITUTION:A device for producing a spun-bonded filament non-woven fabric is provided with (A) a sensor for detecting the weave of a non-woven fabric formed after thermally embossed 10, (B) a device for comparing a weave signal outputted from the sensor with a weave standard signal preliminarily memorized and set, (C) a reflection plate 5 permitting to adjust the angle of its main surface, and reflecting plates 6, 7 capable of being slid in a direction orthogonal to the travel direction of the filament group.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for continuously producing a spunbond long-fiber nonwoven fabric having a good texture, and more specifically, it detects the texture of the produced spunbond long-fiber nonwoven fabric and opens it. The present invention relates to a device for producing a nonwoven fabric having a good texture by adjusting and replacing the angle of a fiber reflection plate.

[0002]

2. Description of the Related Art A method of forming a non-woven fabric from a fibrous material obtained by spinning a high molecular polymer has been widely put into practical use. Above all,
The use of so-called spunbond long-fiber nonwoven fabrics, which are melt-spun to form a sheet from continuous yarns, is widely used. In the process for producing a spunbond long-fiber nonwoven fabric, the spun fibrous material is opened as uniformly as possible to obtain a nonwoven fabric. Various proposals have heretofore been made as methods for opening fibrous materials. For example, a fibrous material may be opened by electrostatically charging, a fiber may be opened by using a fluid, or a fibrous material may be opened by mechanically applying an impact.

These opening methods are appropriately selected and used according to the processing purpose, but from the viewpoint of the uniformity of the sheet, it is required that the long fiber yarns are dropped uniformly. As a fiber-spreading technology that meets this requirement, a method in which a running continuous yarn is collided with a reflection plate, the continuous yarn is charged with the same polarity by friction, and the fiber is opened by its repulsive force is suitable. It has been reported that, for example, a metal mainly containing zinc, zinc oxide, copper or lead is excellent as the material of the reflector (Japanese Patent Application No. 55-3599 and Japanese Patent Publication No. 599).
9-20013), it is known that no effect can be obtained unless a specific material is used.

FIG. 4 shows an outline of a conventional spunbonded nonwoven fabric manufacturing apparatus using a reflection plate. In FIG. 4, the yarn 2 discharged from the spinneret 1 is deposited as a non-woven web 9 on the net conveyor 8 through the ejector 3, the air channel 4, and the deflection plates 5, 6 and 7, and the hot embossing roll is used. 1
0 is heat-fused at a number of points to form a nonwoven fabric 11,
It is wound by the winder 12. Reflector 5 shown in FIG.
Reference numeral 7 is for charging the yarn ejected together with air from the air channel 4 and guiding it to the net conveyor 8.

In the conventional reflector, the collision of the reflector with the high-speed air flow and the yarn causes abrasion of the reflector surface, adhesion of resin or decomposed components of the resin to the surface, and operating time As it becomes longer, the initial good state cannot be maintained, and the texture of the web gradually deteriorates. Therefore, the angle of the reflector is manually changed, or the position of the reflector is continuously shifted to change the collision area between the yarn and the reflector, or the fabric is temporarily stopped and the reflector is replaced. Was taken.

However, as the line speed of the apparatus becomes higher due to the progress of manufacturing technology, it is necessary to visually check the formation on the net conveyor or in the free-run section where the front and back surfaces of the sheet and the web are open. Since it will be difficult, there is no choice but to respond after offline visual confirmation of the texture after changing the frame, and there is a drawback that it may produce a web that is not satisfactory in quality in the time from deterioration of texture to frame change. there were. In addition, it was difficult to confirm the effect of preventing deterioration of the texture by changing the angle and position of the reflector and replacing the reflector during high-speed fabric making.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to automatically change the angle of a reflector plate by a signal from an online formation sensor for detecting the formation of a nonwoven fabric to be formed, and to replace the reflector plate. By doing so, it is an object of the present invention to provide an apparatus for producing a spunbond long-fiber nonwoven fabric capable of maintaining the texture of a continuously produced nonwoven fabric in a favorable range.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to a reflector for opening a melt-spun long fiber bundle, and a long fiber bundle abutted against the reflector and opened to form a nonwoven web. The present invention provides an apparatus for producing a spunbond long-fiber non-woven fabric, which is equipped with a net conveyor that is supported in a form, and is characterized by the following configuration. That is, the above-mentioned long-fiber-bundle-spreading reflection plate is supported by a rotatable shaft, and the angle of the main surface of the reflection plate can be adjusted, and the long-fiber bundle can be slid in a direction orthogonal to the running of the long-fiber group. It consists of a reflector supported on the shaft and replaceable with another new reflector; (a) a sensor for detecting the formation of the non-woven fabric formed after heat embossing; and (b) a detected non-woven fabric. A device for comparing a formation signal emitted from the sensor corresponding to the formation and a reference signal of the formation stored in advance, and (c) a comparison result of the formation signal and the reference signal by the comparison device. Based on the above, there are provided means for adjusting the angle of the main surface of the angle-adjustable reflection plate and means for sliding the exchangeable reflection plate for a new reflection plate.

The construction and operating method of the spunbonded long-fiber nonwoven fabric manufacturing apparatus of the present invention will be described below with reference to the accompanying FIGS. FIG. 1 is a diagram showing an example of an apparatus for producing a spunbond long-fiber nonwoven fabric according to the present invention.
FIG. 3 is an enlarged side view showing a reflection plate installation portion for opening long fiber bundles of the device shown in FIG. 1, and FIG. 3 is an enlarged front view showing the reflection plate installation portion for opening long fiber bundles.

In FIG. 1, the yarn 2 discharged from the spinneret 1 passes through the ejector 3 and the air channel 4 and sequentially hits the reflection plates 5, 6 and 7, and is opened by frictional charging. The opened long fibers are a wire mesh net conveyor 8
Hot embossing roll 1 deposited in the form of a non-woven web on
0 is heat-fused at a number of points to form a nonwoven fabric 11,
It is wound by the winder 12.

A sensor 13 is mounted between the hot embossing roll 10 and the winder 12. Sensor 13
May be a transmitted light type formation detection mechanism in which the light receiving part using a CCD camera or the like is placed on the opposite side of the light source with the non-woven fabric sandwiched, or the light reflection plate may be on the opposite side of the light source and the light receiving part with the non-woven fabric sandwiched. Any of the reflected light type formation detection mechanism installed in the above may be used. The light source used here may be any conventionally known light source. Specifically, an incandescent lamp,
Examples include fluorescent lights and copier lights.

The formation of the nonwoven fabric 11 is detected by the sensor 13 based on the transmission profile of the reflected light from the light reflection plate 14, and the signal i ₁ is input to the computer 15. The reference formation signal I is stored in the computer 15 in advance. The standard formation signal I includes an appropriate formation signal range and past trends according to the unit weight of the non-woven fabric 11, grade of opacity, etc., current reflector angle and past angle change time, previous reflector Exchange (slide)
The direction, etc. is stored and set.

The computer 15 compares the reference formation signal I stored and set in advance with the signal i ₁ and outputs the angle change command signal i ₂ to the angle adjuster 16 at an appropriate timing. The angle adjuster 16 rotates the stepping motor 18 based on a signal from the computer 15 while feeding back the angle encoder 19 to change the angle of the first-stage reflector 5. At this time,
Since the angles of the reflectors 6 and 7 are fixed, the yarn collecting state on the net conveyor 8 is hardly affected.

For this reason, the yarn moves from the locally defective surface of the reflecting plate 6, and the surface portion of the reflecting plate 6 on which the yarn collides becomes a good surface again, so that the texture can be restored. . Also, to protect the motor, when the angle change according to the command is completed, the brake device works on the reflector rotating shaft,
Until the next movement opportunity, even if the current to the stepping motor 18 is cut off, the angle is surely maintained. After a few minutes, preferably within 5 minutes after the operation, the computer 15 compares the reference formation signal I with the signal i ₁ and if the formation recovery tendency is not found, the computer 15 causes the reflector replacement command signal i ₃ Is output to the slide adjuster 17.

The slide adjuster 17 is a computer 15
The direction of rotation of the servo motor 20 is determined based on the signal of (1), the servo motor 20 is rotated, and a new reflection plate 22 is inserted while pushing out the second reflection plate 6 by the rack and pinion gear. Here, the reflector 22 to be inserted
Are waiting in a laterally adjacent position of the reflection plate 6 for replacement, as shown in FIG. At this time, the reflector 6 and the reflector 22
Are continuously exchanged with each other, so that the yarn collecting state on the net conveyor 8 is hardly affected. By this replacement, the surface portion of the second-stage reflecting plate on which the yarn collides becomes a surface in a good state again, so that the texture of the non-woven fabric can be restored.

The spunbond continuous fiber non-woven fabric whose texture is controlled by the apparatus of the present invention may be any spunbond continuous fiber non-woven fabric manufactured by utilizing a conventionally known opening mechanism by triboelectrification. good. Further, the basis weight of the nonwoven fabric produced by the device of the present invention is 5 to 50 g / m ²
Something is used. That is, in the method of detecting the formation signal of the nonwoven fabric used in the device of the present invention,
This is because the light transmitted through the non-woven fabric is used at least once, so that it is difficult to obtain a sufficient formation signal when the basis weight exceeds about 50 g / m ² and the opacity increases.

As the actuator used in the angle adjusting mechanism of the device of the present invention, a conventionally known actuator is used. Specifically, it is a stepping motor, a servo motor, an induction motor, or the like. Further, it may be combined with a gear such as a Geneva top, or the linear movement of the actuator may be changed to a rotational movement for use. Further, conventionally known actuators are also used for the actuator used in the slide mechanism of the device of the present invention. Specifically, it is an air cylinder, a hydraulic cylinder, or the like.
Also, the movement of the rotating actuator can be changed to a linear movement by a rack and pinion gear or the like and used.

The number of reflectors having the angle changing function and the number of reflectors having the exchanging function may be one or more. Further, the reflectors having the angle changing and exchanging functions may be the same and may be used in one stage or a plurality of stages.

[0019]

EXAMPLES Using the apparatus shown in FIGS. 1 to 3, polypropylene resin was melt-spun according to the above-mentioned operation method,
A spunbond long-fiber nonwoven fabric having a basis weight of 30 g / m ² was manufactured at a cloth-making speed of 80 m / min. Table 1 shows the results of evaluating the texture of the resulting nonwoven fabric. The formation is evaluated every time a predetermined fabric-making time has elapsed, and is displayed according to the following four-step criteria. ◎: Good, ○: Somewhat good, △: Some unevenness is noticeable, ×:
Conspicuous unevenness

For comparison, when only the reflecting plate having the rotating function is used and the reflecting plate having the exchanging function is not used (Comparative Example 1), and when the reflecting plate having the rotating function is not used, the fixing is performed. Similarly, in the case where only the reflecting plate was used and the reflecting plate having the exchange function was not used (Comparative Example 2), the results of the formation evaluation at each elapse of a predetermined fabric-making time are also shown in Table 1.
Shown in.

[0021]

[Table 1]

[0022]

In the spunbond long-fiber nonwoven fabric manufacturing apparatus provided with the reflection plate for opening a long fiber bundle, the yarn collides with the reflection plate and is triboelectrically charged to open the fiber. In this case, the opened state depends on the charge amount. That is, it depends on the surface condition of the reflector. When the surface of the reflector plate is subjected to high-speed air flow and collision with a yarn, for example, abrasion of the surface, adhesion of resin to the surface, adhesion of thermally decomposed components of the resin, and the initial good state cannot be maintained. The texture of the non-woven fabric deteriorates.

In the present invention, as described above, the formation of the nonwoven fabric is detected by the formation sensor, the formation signal is input to the computer, and the formation signal of the nonwoven fabric and the reference stored in advance are stored in the computer. The signal is compared to detect the tendency of formation deterioration online from both signals, and the actuator is actuated on that signal to rotate or replace the reflector, so that the part where the yarn hits the reflector is the same. The surface part of the reflection plate which has moved from the locally defective surface up to the point where the yarn collides becomes a good surface again, so that the texture of the nonwoven fabric can be restored.

When a plurality of reflectors are installed when the reflectors are rotated, if the last reflector is left fixed, the direction of yarn flow away from the reflectors and the net conveyor's direction. This operation can be performed without changing the collection angle formed by the collection surface. Further, when the reflecting plate is replaced, if the extruded old reflecting plate is replaced with a new reflecting plate, the above method can be continuously and repeatedly performed. Further, since the formation is detected online, one reflector can be used up to the limit, so that the number of times of replacement can be minimized. Further, since it is not necessary to stop the cloth making once when the reflector is replaced, product loss at the time of replacement can be eliminated.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of a manufacturing apparatus of the present invention.

FIG. 2 is an enlarged side view of a reflector installation portion of the apparatus shown in FIG.

FIG. 3 is an enlarged front view of a reflector installation portion of the apparatus shown in FIG.

FIG. 4 is a schematic diagram showing a conventional spunbond long-fiber nonwoven fabric manufacturing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spinneret 2 Thread 3 Ejector 4 Air channel 5, 6, 7 Reflector for opening long fiber bundles 8 Net conveyor 9 Nonwoven web 10 Heat embossing roll 11 Nonwoven fabric 12 Winder 13 Sensor 14 Light reflector 15 Computer 16 Angle adjuster 17 Slide adjuster 18 Stepping motor 19 Angle encoder 20 Servo motor 21 Rack and pinion gear 22 Reflector for replacement

Claims (1)

[Claims] 1. A reflecting plate for opening a melt-spun long fiber bundle, and a net conveyor for supporting the opened long fiber bundle in contact with the reflecting plate in the form of a nonwoven web. In a manufacturing apparatus for spun-bonded long-fiber nonwoven fabric, the long-fiber-bundle opening reflecting plate is supported by a rotatable shaft, and the angle of its main surface can be adjusted. A reflector that is supported by a shaft that is slidable in a direction orthogonal to the direction and is replaceable with another new reflector; and (a) a sensor that detects the formation of the non-woven fabric formed after heat embossing;
(B) A device for comparing the formation signal emitted from the sensor corresponding to the detected formation of the non-woven fabric with a preset reference signal of the formation, and (c) a formation signal by the comparison device. And means for adjusting the angle of the main surface of the angle-adjustable reflector, and means for sliding the replaceable reflector to replace it with a new reflector, based on the result of comparison between the reference signal and the reference signal. An apparatus for manufacturing spunbond long-fiber non-woven fabrics.