JPS6293661A - Method and apparatus for dusting test of nonwoven fabric material - Google Patents

Abstract

PURPOSE:To certainly measure a dusting amount by obtaining the same dusting effect as the working state of a person, by spraying clean air on a nonwoven fabric material being a material to be tested held in a cylindrical form while simultaneously applying twisting force and expansion/contraction force to said material. CONSTITUTION:A test piece fixing holder 3 is suspended from the central part of the housing upper plate 2 of a housing 1 and a movable holder 5 is erected from the central part of a housing lower plate 4 so as to be opposed to said holder 3. The movable holder 5 receives reciprocal motion and rotary motion by a drive apparatus 10 through a shaft 6. By this constitution, up-and-down expansion/contraction and twisting due to rotation are applied to a material 30 tested. A given amount of clean air is allowed to flow in the housing from a righthand inlet 1a over the entire area thereof at uniform wind velocity and a suspended particle measuring apparatus is placed at the righthand inlet 1a and a lefthand outlet 1b and the amount of particles separated from the material 30 is measured to make it possible to accurately measure the dusting amount from the material 30.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a dust generation test method and apparatus for measuring separable particles exfoliated from the surface and inside of woven and nonwoven materials for clean rooms. It is related to.

(Prior Art) Special fabrics and materials are used in clean rooms and other rooms where dust generation is averse. In other words, the materials used for clothing and other items used in such places are those that make it difficult for particles such as one fiber to separate from one surface.

Even so, when the material moves in a straight line, particles separate and scatter from its surface and inside.

If we measure the degree of this dispersion,
Although it is absolutely necessary for checking the quality of clean clothes and other materials and researching the improvement of materials, until now no accurate measuring method has been used.

(Problem to be solved by the invention) Currently, the dust generation test method for materials such as clean clothes is to measure the dust generation when a person wears actual clean clothes, enters a clean room, and performs a specific task. There is a method of measuring dust, but this method does not give accurate results because dust is generated by factors other than clean clothes. Also, as shown in Figure 6,
Some products generate dust by placing clean clothes C in a drum D and rotating the drum with rollers R, but this does not generate much dust, and the movement of the clothes at this time is such that a person can It was not effective as a test method because the movement would be different from that when working while wearing it.

Therefore, the present invention operates in a manner similar to when a person works,
In addition, the present invention has been made to obtain a method for carrying out tests on woven and non-woven materials for use in clean rooms, such as clean clothes, by moving only a part of the test material of the clothes in a reproducible manner, and an apparatus for carrying out the tests. It is something that

(Means for Solving the Problems) The present invention, as a means for solving the above problems, involves gripping a nonwoven material, which is a material to be tested, in a cylindrical shape, and In order to realize this method, both ends of the woven and non-woven material to be tested were A pair of holders are provided which are held circularly and held in a cylindrical shape, and at least a part of the holders is supported rotatably and movably toward and away from the other.

The holder is connected to a rotating drive source and a reciprocating drive source, and a device is provided for arranging the woven and non-woven material in a clean air flow path.

(Function) If you grip the material under test and move the holder as described above,
Since the movement of clothes is similar to that when a person works, the dust generation effect is similar to that of a person actually working. Moreover, since the same mechanical movement is repeated and the operation is reproducible, the amount of dust generated from the materials is always changed to a constant level by the five materials under the same conditions.

Furthermore, since the amount of clean air that is blown is constant, it is possible to reliably measure the amount of dust generated.

(Example) Hereinafter, an example of the apparatus of the present invention will be explained with reference to the drawings. Note that the method of the present invention can be realized using the apparatus of this example. In FIG. 1, a test piece fixing holder 3 hangs down from the center of the upper casing plate 2 of the casing l, and a movable holder 5 rises from the center of the lower casing plate 4 to face it. There is. A manual handle 3h for position adjustment is attached to the fixed halter 3 VC. Below the movable holder 5 is a movable holder drive 5iitt.

is housed in the machine room 11. A movable holder shaft 6 extending downward from the movable holder 5 enters the machine room IT, and the shaft 611t is supported by a main support 7 so that it can freely perform two movements: rotation and sliding in the viewing direction. I'm here. The drive device IO includes a mechanism that allows the movable holder 5 to perform both vertical reciprocating motion and rotational motion at the same time. That is, in the drive device 1°, a motor board 12 is fixed to the lower surface 4 of the casing l by four support columns 13.13a, and a rotating motor 14 and a vertical movement motor 15 are attached to the motor board 12. j is there. The rotation motor 14 is located directly below the movable holder shaft 6, and a rotation motor shaft 17 rises from the rotation motor 14 and is coupled to the movable holder shaft 6 by a spline 17a. A ball screw 18 is connected from the vertical movement motor 15 in parallel to the rotation motor 17.
stands up, and its upper end is supported by a bearing 19 attached to the bottom of the workpiece 1 and 4. A vertical drive unit 20 is screwed onto the ball screw 18 by a vertical movement nut 21, and the vertical drive unit 1-20 is located near the ball screw 18 among the four support columns 13.13a of the motor board 12. It is fitted onto two support columns 13a by sliding bearings 22. Further, a vertical stroke control column 23 is provided in parallel with the ball screw 18, and an upper FL control holder 23a
1. The lower limit control receiver 23b is attached. Receipt 23
a.

The vertical position of 23b is movable according to the test conditions, and the stroke can be 10α or more. The vertical drive (22) 20 is provided with a protrusion 20a for abutting against it.

- The lower sumo wrestler drive unit 20 and the movable holder shaft 6 are rotatably fixed to the movable holder shaft 6 in the vertical direction as shown in FIGS. and is coupled by a vertical movement unit 24 fitted so as to be vertically movable. The vertical movement unit 24 has a recess 25, into which a cam follower 26a, which is not attached to a fork 26 protruding from the vertical drive unit 20, is fitted, as shown in FIG.

A negative pressure chamber 27 is provided in the space where the movable holder shaft 6 passes through between the casing 1 and the machine room 11 forming the test chamber 9 and is embedded in the machine room 11 . The upper part of the negative pressure chamber 27 is the lower casing plate 4 through which the movable holder shaft 6 passes.
The gap with the movable holder shaft 6 is narrow, 0.5 days or less, and maintains a certain degree of airtightness. At the bottom of the negative pressure chamber 27 is the main bearing 7 of the movable holder shaft. The length of the negative pressure chamber 27 in the vertical direction is slightly longer than the vertical stroke of the movable holder 5. Vcf'i does not appear.

When conducting the test, first, a woven and non-woven material (for example, a material for clean clothes) 30 is inserted between the fixed holder 3 and the movable holder 5 as shown in FIG. At this time, the movable halter 5 is placed in the lower lying position tIi, and the rotation angle is set to the 00 position. The sample f material 30 shall have the same shape and dimensions as the JISA4 and JISA3 paper sizes, and in the case of A4, the flanges 3a, 5 of the fixed holder 3 and the movable holder 5.
In case of A3, insert the sample material 30 into A3 using Id7 lunges 3b and 5b. For insertion, as shown in FIG. )K vs. shite tighten. In this case, in order to correct slight dimensional errors in the mounting condition or the supplied material, adjust the position of the fixed holder 3 by slightly moving it up and down by turning the handle 3h. The screw portion 3n that moves up and down at this time is built into the fixed holder as shown in FIG.
is not directly exposed and the space is kept clean.

When the test material is fastened, the drive device IO is moved to start operation, and the rotation motor 14 is a pulse motor and is rotated in the forward direction VCl 35° to 180° from the Oo position according to a command from a command device (not shown). Rotate. Then, the movable holder shaft 6 directly connected to the rotation motor shaft 17 via the spline 17ae performs a similar rotation.

When the rotation end point is reached, a reverse rotation command pulse is given, and the rotation is reversed by 270 to 360 degrees. Next, it rotates 270 to 360 degrees in the positive direction again, and repeats the reciprocating rotation. Reciprocation period Vi is within 3 seconds 0 When the rotation motor 14 rotates, the vertical movement motor 1
5 also starts driving. The vertical motion motor 15 is also a pulse motor, but it is supplied with pulses having a considerably higher wave number than the pulses supplied to the rotation motor 14, and rotates at high speed.

First, the pole screw 18 is rotated by the rotation of the vertical movement motor 15. Accordingly, the vertical drive unit 20 is guided by the support column 13a and rises from the lower limit point. When the protrusion 20m of the vertical drive unit 20 reaches the stroke control holder 23a, the vertical motor 15tl starts to rotate fully in reverse, and the protrusion 20a of the vertical drive unit 20 reaches the stroke control holder 23b and rotates again. and repeat the up and down movement. The period of vertical movement is also within 3 seconds. The cam follower 26a is moved up and down by the fork 26 of the vertical drive unit 20, and since this is fitted into the recess 25 of the vertical movement unit 24, the vertical movement unit 24 is moved up and down, so that the vertical direction is fixed thereto. The movable holder shaft 6 moves up and down. In this way, the movable holder shaft 6 repeatedly moves up and down while rotating, and the movable holder 5 fixed thereto also performs rotational movement and up-and-down movement at the same time. The sample material 30, which is fastened to the movable holder 5, is subjected to vertical expansion and contraction and twisting due to rotation. This is similar to the action that all people wear when wearing clothes, and woven and non-woven materials (such as materials for clean clothes) that undergo expansion, contraction, and twisting in this way are made by humans; & Particles are separated from the surface of the sample material 300 in the same way as dust generation that occurs when working while wearing clothes.

On the other hand, a certain amount of clean air flows into the housing 1 from the right side 1a at a uniform wind speed over the entire area, passing through the entire space where the test material is moving, and then passing through the space where the test material is moving. It is designed to flow away in the direction of the outlet 1b. Therefore, a suspended particle measuring device 1a is installed at the right side exit 1a and the left side exit 1b, and the amount of particles separated from the material 30 is measured.

Further, the inside of the negative pressure chamber 27 is suctioned by a separately provided negative pressure generation pump (not shown) and maintained at a slightly negative pressure. Therefore, machine room 11
Dust generated from inside the housing l will not enter through the through hole 28. In addition, the difference in diameter between the through hole 28 and the movable holder shaft that passes through it is extremely small, and the pressure inside the negative pressure chamber 27 is only a little, so the air inside the housing passes through this gap. It almost never leaks.

(Effect of the invention) Since the present invention has the above-mentioned groove bottom and function, it is possible to perform operations similar to those performed by a person wearing actual clothes by simply using a small material for testing. , can be applied to the sample material, and the amount of dust emitted from the material can be accurately measured. Moreover, since the weiring method and movement of the test material are carried out in a fixed and reproducible manner, there is no variation in the measurement results. As described above, according to the present invention, it is possible to obtain a method and apparatus capable of performing a dust generation test on woven and nonwoven materials with reproducibility.

[Brief explanation of drawings]

Figure 1 is a side view of the external appearance of the device of the present invention, with the test casing and the side cover of the machine room partially removed. Figure 3 is a plan view of the vertical drive unit, Figure 4 is a perspective view of the sample material being attached to fixed and movable holders, Figure 5 is a cross-sectional view of the portion of the fixed holder that is manually adjusted, and Figure 6 is a perspective view of a conventional method. l...Housing 3...Fixed holders 3a, 3b...Fixed holder cylindrical head 5
......Movable holder 5a, 5b...Movable holder cylindrical head 6.
......Movable holder shaft 14...Rotation motor 20... Vertical drive unit 24... Vertical movement unit 26... Vertical drive unit fork 30・・・
... Test material patent applicant Akado Seisakusho Co., Ltd. Representative Patent attorney Yumi Hagi (1 person @ 2)
Figure 3 Figure 4 Figure 6

Claims (2)

[Claims] (1) Grip the woven non-woven material to be tested in a cylindrical shape, and apply clean air to the material while simultaneously applying torsional force and stretching force to the woven non-woven material held in the cylindrical shape. A dust generation test method for woven and non-woven materials characterized by applying dust to the material. (2) A pair of holders are provided to circularly press both ends of the woven and non-woven material to be tested and hold it in a cylindrical shape, and at least one of the holders is rotatable and close to the other. The woven non-woven material is supported in a retractable manner, the holder is connected to a rotating drive source and a reciprocating pivot source, and the woven non-woven material is disposed in a flow path of clean air. Dust generation test equipment for woven materials.