JP2022088836A - Method for evaluating resin fiber - Google Patents

Abstract

To provide a practical method for evaluating resin fiber capable of performing objective evaluation.SOLUTION: With a method for evaluating resin fiber 10 composed of resin, a placing member 30 placed on laid resin fiber 10 is pulled at constant speed, tensile load of the placing member 30 is measured, and the resin fiber 10 is evaluated based on an amplitude of variations in the measured tensile load.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for evaluating a resin fiber.

Conventionally, the method described in Patent Document 1 is known as a method for producing a fiber aggregate having a mat-like fiber. Specifically, in the method for producing a fiber aggregate described in Patent Document 1, a fiber made of a wood material such as kenaf or a fiber made of a resin is put into a hopper, and a fiber opening cylinder and a roller are rotated. It is disclosed that these fibers are dispersed in the air and deposited on a conveyor to obtain a fiber deposit, and then the fiber deposit is needle punched to obtain a fiber aggregate.

Japanese Unexamined Patent Publication No. 2004-339653

However, in the configuration disclosed in Patent Document 1, depending on the type and state of the fiber (resin fiber) composed of the resin, the resin fiber may not be dispersed well in each step, and the fiber may be clogged in an open fiber cylinder, a roller, or the like to collect the fiber. If the production of the body is delayed or the fiber is not mixed well with the fiber composed of the wood material, a fiber aggregate in which the resin fiber is partially biased may be produced. The causes of this are that if the type and state of the resin fiber are different, the amount of oil (surface active agent) attached when the resin fiber is manufactured, the shape of the resin fiber, the feel when the resin fiber is touched, etc. ( It is considered that this is due to the difference in the characteristics of the resin fiber). In addition, such a characteristic of the resin fiber may be called squeaky property.

Therefore, a worker at the time of manufacturing may evaluate the squeaky property of the resin fiber by, for example, touching the resin fiber with his / her finger and classifying the feeling stepwise. However, in that case, the evaluation of squeakiness depends on the sense of the worker, so that the objectivity is inferior.

The present invention has been completed based on the above circumstances, and an object of the present invention is to provide a practical evaluation method for a resin fiber capable of objective evaluation.

The present invention is a method for evaluating a resin fiber composed of at least a resin, in which a mounting member placed on the spread resin fiber is pulled at a constant speed, and the tensile load of the above-mentioned mounting member is measured. It is characterized in that the resin fiber is evaluated based on the measured fluctuation amplitude of the tensile load.

As a result of diligent studies by the inventors of the present application, "feeling when the resin fiber is touched with a finger", which is one of the indexes showing the characteristics of the resin fiber, is when the mounting member placed on the resin fiber is pulled. It was found that there was a correlation with the amplitude of the fluctuation of the tensile load of. That is, by evaluating the amplitude of the fluctuation of the tensile load as in the above evaluation method, it is possible to objectively determine the quality of the resin fiber without evaluating the squeaky property of the resin fiber by relying on the tactile sensation. .. For example, if the amplitude is relatively large, it corresponds to a large squeaky property, and it can be determined that the resin fiber is suitable. On the other hand, when the amplitude is relatively small, it corresponds to the small squeakiness, and it can be determined that the resin fiber is not suitable. In the above-mentioned evaluation method of resin fibers, the amplitudes of a plurality of resin fibers may be measured and the amplitudes of the respective resin fibers may be compared for relative evaluation, and the measured amplitudes may be used as the mounting member. The evaluation may be made based on whether or not the reference value determined according to the conditions such as the pulling speed and the device for evaluating the resin fiber is satisfied.

In the method for evaluating the resin fiber, the amplitude may be amplified. According to such an evaluation method of the resin fiber, it becomes easy to judge whether the resin fiber is good or bad, and it is suitable.

In the method for evaluating a resin fiber, the amplitude may be amplified by pulling the above-mentioned placement member by a string portion provided with an elastic portion having elasticity. Further, in the method for evaluating the resin fiber, the resin fiber may be spread on a plurality of convex protrusions, the pre-described placement member may be placed, and the pre-described placement member may be pulled to amplify the amplitude. good. According to such a resin fiber evaluation method, it is possible to effectively amplify the amplitude of the fluctuation of the tensile load.

In the resin fiber evaluation method, the detection unit for detecting the tensile load is displaced, the above-mentioned placement member is pulled by the string portion detected by the detection unit, and the average value of the amplitudes while pulling within a predetermined range. The resin fiber may be evaluated based on the above. According to such a resin fiber evaluation method, it is possible to exclude an amplitude (for example, an amplitude before the mounting member is pulled and starts to move) that is difficult to contribute to the judgment of the quality of the resin fiber, and the resin fiber can be accurately evaluated. Can be inspected.

According to the present invention, it is possible to provide a practical evaluation method for a resin fiber capable of objective evaluation.

A side view of the evaluation device and the resin fiber according to the first embodiment. View of the evaluation device and the resin fiber from above The figure which shows an example of the graph of the displacement distance of a load cell and the tensile load with respect to it. The figure which showed the measurement result of each value in an Example and a comparative example. A side view of the evaluation device and the resin fiber according to the second embodiment.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 4. In this embodiment, an evaluation device 100 for evaluating a resin fiber 10 used for manufacturing a door trim (interior material for a vehicle) attached to a door of an automobile (vehicle), and an evaluation method for the resin fiber 10 will be described. The resin fiber 10 is manufactured as a door trim by being mixed with a wood-based material such as kenaf, opened and laminated, processed into a mat shape or a board shape, and then subjected to a heating and pressing process using a molding die. .. In FIG. 1, the vertical direction is the vertical direction and the horizontal direction is the horizontal direction.

As shown in FIGS. 1 and 2, the resin fiber 10 has a cotton-like shape as a whole, in which fibrous resins are gathered to some extent. As the shape of each of the resin fibers 10, linear, wavy, spiral, tubular or the like can be adopted. As the resin constituting the resin fiber 10, resins such as polyethylene, polypropylene, polystyrene, polyurethane, polyacetal, polyethylene terephthalate, and polyvinylidene chloride can be adopted. In this embodiment, polypropylene is used as the resin constituting the resin fiber 10.

The evaluation device 100 for evaluating the resin fiber 10 includes a base 20, a box-shaped box portion 21 attached to the base 20 and accommodating the resin fiber 10, and a mounting member 30 mounted on the resin fiber 10. , A string-shaped string portion 40 whose one end is connected to the mounting member 30, a load cell (detection section) 50 to which the other end of the string portion 40 is connected, an elevating part 51 that raises and lowers the load cell 50 up and down, and a load cell. A control unit 60 electrically connected to the 50 and the elevating unit 51 is provided.

The box portion 21 has a rectangular shape in a top view with the long side in the left-right direction, and its four corners are attached to the base 20 by screws. The box portion 21 includes a brushed skin 22 attached to the upper surface side of the lower wall portion. Resin fibers 10 are spread on the inside of the box portion 21 and on the upper surface side of the raised skin 22. The brushed skin 22 prevents the resin fiber 10 from slipping in the box portion 21. In FIG. 1, the box portion 21 is shown in cross section for convenience.

The mounting member 30 includes a plate portion 31 which is a metal plate, and a metal weight 34 mounted on the plate portion 31. The plate portion 31 includes a main body portion 32 that forms a majority, and a bent portion 33 that is bent to the upper left from the main body portion 32. The main body 32 is a portion on which a weight 34 is placed, and a non-woven fabric 35 made of polypropylene is attached to the lower surface side of the main body 32. The non-woven fabric 35 is in contact with the resin fiber 10. The bent portion 33 can prevent the plate portion 31 from being caught or slipped into the resin fiber 10 when the mounting member 30 moves to the left due to the displacement of the load cell 50 described later.

One end of the string portion 40 on the right side is connected to the bent portion 33 of the mounting member 30, and the other end on the opposite side (upper side) is connected to the load cell 50. The string portion 40 is made of a metal wire, and an intermediate portion thereof is hung on a pulley 23 attached to the base 20. In the string portion 40, a portion from the bent portion 33 to the pulley 23 extends in the horizontal direction, and a portion from the pulley 23 to the load cell 50 extends in the vertical direction. The string portion 40 includes an elastic portion 41 having elasticity in a portion between the bent portion 33 and the pulley 23. The elastic portion 41 is a spring that can be extended in the left-right direction (the direction in which the mounting member 30 is pulled).

The load cell 50 is a sensor capable of detecting a force (hereinafter referred to as a tensile load) that pulls the mounting member 30 via the string portion 40. When the elevating unit 51 raises the load cell 50 upward at a constant speed according to the instruction of the control unit 60, the string portion 40 connected to the load cell 50 pulls the mounting member 30 at a constant speed, and the mounting member 30 Move to the left. Then, the control unit 60 measures the distance at which the load cell 50 is displaced upward and the tensile load detected by the load cell 50 with respect to the displacement. The sensor for detecting the tensile load is not limited to the load cell, and various force sensors can be used.

Subsequently, the evaluation method of the resin fiber 10 will be described. In the evaluation method of the resin fiber 10, first, according to the instruction of the control unit 60, the elevating unit 51 displaces the load cell 50 upward at a constant speed, and the string portion 40 connected to the load cell 50 causes the mounting member 30 to move at a constant speed. Pull to the left with. Then, the control unit 60 measures the distance at which the load cell 50 is displaced upward and the tensile load detected by the load cell 50 with respect to the displacement. At this time, the elastic portion 41 provided on the string portion 40 extends in the left-right direction to amplify the amplitude of the fluctuation of the tensile load (details will be described later).

FIG. 3 is a graph (shown by a solid line) in which the distance (mm) in which the load cell 50 is displaced upward is shown on the horizontal axis, and the tensile load (N) detected by the load cell 50 with respect to the displacement is shown on the vertical axis. It represents an example. This graph is depicted by the control unit 60. When the mounting member 30 is stopped on the resin fiber 10 and is pulled by the string portion 40 (for example, when the load cell 50 is displaced upward by about 0 mm to 7 mm), the tensile load decreases. Continues to rise. When the load cell 50 is displaced by a certain distance or more (for example, when the load cell 50 is displaced upward by 8 mm or more), the mounting member 30 moves slightly to the left on the resin fiber 10 and then stops its movement. repeat. The tensile load repeats a fluctuation that temporarily decreases when the mounting member 30 moves slightly to the left and temporarily increases when the mounting member 30 stops. The fluctuation in which the tensile load decreases, then increases, and then decreases again is called a unit period. The unit period may be a fluctuation in which the tensile load increases, then decreases, and then increases again.

The control unit 60 sets the point where the tensile load is maximum in the unit cycle as the maximum value Ymax (in FIG. 3, a dotted line is shown connecting each Ymax point in each unit cycle), and the tensile load is the minimum in the same unit cycle. When the value is the minimum value Ymin (in Fig. 3, a dotted line is shown by connecting each Ymin point for each unit period), the difference between the maximum value Ymax for each unit period minus the minimum value Ymin. ΔY is calculated as the amplitude (N) of the fluctuation of the tensile load.

Further, the control unit 60 designates a predetermined range of the distance that the load cell 50 is displaced upward, and the elevating unit 51 sets the mounting member 30 via the load cell 50 and the string portion 40 within the predetermined range. The average value of the amplitude ΔY while pulling to the left at a constant speed is calculated. In the predetermined range, the distance that the load cell 50 is displaced upward is preferably 20 mm or more (more preferably 30 mm or more, further preferably 40 mm or more), and 70 mm or less. It is preferable (more preferably 60 mm or less). In such a range, the amplitude of the fluctuation of the tensile load is stable, and the average value of the amplitude is likely to indicate the peculiar value of the mounting member 30.

In this way, the amplitudes of the plurality of resin fibers 10 (calculated as an average value) are measured, and the quality of the resin fibers 10 is relatively evaluated by comparing the amplitudes of the resin fibers 10 with each other. For example, for a plurality of resin fibers 10 having different manufacturing processes, manufacturers, and the like, the distance at which the load cell 50 is displaced upward and the tensile load for the displacement are measured, and the average value of the amplitudes within the predetermined range is calculated. Then, a suitable resin fiber 10 is selected by comparing the average values of the amplitudes calculated for each resin fiber 10.

Subsequently, the effect of this embodiment will be described. In the present embodiment, it is an evaluation method of the resin fiber 10 made of resin, and the mounting member 30 placed on the spread resin fiber 10 is pulled at a constant speed, and the tensile load of the mounting member 30 is measured. Then, an evaluation method for evaluating the resin fiber 10 based on the measured fluctuation amplitude of the tensile load was shown.

According to such an evaluation method, by evaluating the amplitude of the tensile load, it is possible to objectively determine the quality of the resin fiber 10 without evaluating the squeaky property of the resin fiber 10 by relying on the tactile sensation. For example, if the amplitude is relatively large, it corresponds to a large squeaky property, and it can be determined that the resin fiber 10 is suitable. On the other hand, when the amplitude is relatively small, it corresponds to the small squeakiness, and it can be determined that the resin fiber 10 is not suitable. In the present embodiment, the evaluation method of the resin fibers 10 is to measure the amplitudes of a plurality of resin fibers 10 and compare the amplitudes of the resin fibers 10 with each other for relative evaluation. Not limited to. For example, it may be evaluated based on whether or not the measured amplitude satisfies a reference value determined according to the speed of pulling the mounting member 30 and the conditions of the evaluation device 100 and the like.

Further, in the evaluation method of the resin fiber 10, the amplitude is amplified. According to such an evaluation method of the resin fiber 10, it becomes easy to judge whether the resin fiber 10 is good or bad, which is preferable.

Further, in the evaluation method of the resin fiber 10, the amplitude is amplified by pulling the mounting member 30 by the string portion 40 provided with the elastic portion 41 having elasticity. According to such an evaluation method of the resin fiber 10, the amplitude can be effectively amplified.

Further, in the evaluation method of the resin fiber 10, the load cell 50 for detecting the tensile load is displaced, the mounting member 30 is pulled by the string portion 40 connected to the load cell 50, and the average value of the amplitudes while pulling within a predetermined range. The resin fiber 10 is evaluated based on the above. According to such an evaluation method of the resin fiber 10, it is possible to exclude the amplitude (for example, the amplitude before the mounting member 30 is pulled and starts to move) that is difficult to contribute to the judgment of the quality of the resin fiber 10, and the accuracy is high. The resin fiber 10 can be inspected well.

Hereinafter, the present technique will be described in detail based on examples. The present technique is not limited to these examples.

<Example 1>
The resin fiber 10A manufactured by Company A, in which fibrous polypropylene was collected and formed into a cotton-like shape as a whole, was housed in the box portion of the evaluation device. The mounting member was placed on the resin fiber 10A. Among the mounting members, stainless steel (SUS430) was used as the material for the plate portion, and iron was used as the material for the weight. A non-woven fabric manufactured by the spunbond method using polypropylene was attached to the lower surface side of the main body of the plate. One end of the metal wire (string portion) was connected to the bent portion of the mounting member, and the other end of the wire was connected to the load cell. The middle part of the wire was hung on a pulley. In the wire, an extendable spring (elastic portion) is provided in the portion between the bent portion and the pulley.

The load cell was raised upward by the elevating part, and the mounting member was pulled by a wire. At this time, the distance (mm) in which the load cell was displaced upward and the tensile load (N) detected by the load cell with respect to the displacement were measured. In addition, the average value of the amplitude of the fluctuation of the tensile load when the distance of the load cell displaced upward is within the range of 40 mm or more and 60 mm or less was calculated. The results are shown in FIG. In the graph of FIG. 4, the distance (mm) in which the load cell is displaced upward is shown on the horizontal axis, and the tensile load (N) detected by the load cell with respect to the displacement is shown on the vertical axis.

<Examples 2 to 5>
In Example 2, the same procedure as in Example 1 was carried out except that the resin fiber 10B manufactured by Company B was housed in the box portion. In Example 3, the same procedure as in Example 1 was carried out except that the resin fiber 10C manufactured by Company C was housed in the box portion. In Example 4, the same procedure as in Example 1 was carried out except that the resin fiber 10D manufactured by Company D was housed in the box portion. In Example 5, the same procedure as in Example 1 was carried out except that the resin fiber 10E manufactured by Company E was housed in the box portion. The results are shown in FIG. 4, respectively.

<Comparative Example 1 to Comparative Example 5>
In Comparative Example 1, the same procedure as in Example 1 was carried out except that the wire was not provided with a spring (elastic portion). Comparative Example 2 was the same as that of Comparative Example 1 except that the resin fiber 10B used in Example 2 was housed in the box portion. Comparative Example 3 was the same as that of Comparative Example 1 except that the resin fiber 10C used in Example 3 was housed in the box portion. Comparative Example 4 was the same as that of Comparative Example 1 except that the resin fiber 10D used in Example 4 was housed in the box portion. Comparative Example 5 was the same as that of Comparative Example 1 except that the resin fiber 10E used in Example 5 was housed in the box portion. The results are shown in FIG. 4, respectively.

[Evaluation of amplitude]
In Examples 1 to 5, the average value of the amplitude is higher than that of Comparative Example 1 to 5 using the same resin fiber (for example, in Example 5, the average value of the amplitude is 2. In contrast to 039N, in Comparative Example 5 using the same resin fiber 10E, the average value of the amplitude is 0.055N). Therefore, it can be seen that the amplitude is amplified by providing a spring on the wire. Further, in the examples, the average value of the amplitudes increased from Example 1 to Example 5, whereas in the comparative examples, such a tendency is not seen. Regarding the average value of the amplitude, for example, Example 5 is about 47 times as large as that of Example 1, is about 8 times as large as that of Example 2, and is about 3.4 times as large as that of Example 3. It can be seen that there is about 1.9 times as much as that of Example 4. On the other hand, regarding the average value of the amplitude, for example, Comparative Example 5 is about 1.4 times as much as Comparative Example 1 and about 1.4 times as compared with Comparative Example 2, and is compared with Comparative Example 3. It can be seen that the value is about 1.3 times, which is about 1.9 times that of Comparative Example 4. Therefore, in the examples, the superiority or inferiority of each resin fiber can be accurately evaluated as compared with the comparative example. In particular, in Comparative Example, Comparative Example 4 has the lowest average value of amplitude, but in Example 1, Example 1 has the lowest average value of amplitude. In the comparative example, for example, it is considered that the average value of the amplitudes of the comparative example 4 is calculated to be the lowest due to an error, and in such a comparative example 4, the resin fiber 10D is determined to be unsuitable. there is a possibility.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. In this embodiment, the same reference numerals are used for the same parts as those in the above embodiment, and duplicate description of the structure, action and effect will be omitted.

The evaluation device 200 includes a string-shaped string portion 240 having one end connected to the mounting member 30 and the other end connected to the load cell 50, and a plurality of convex convex portions 224 provided on the upper surface of the base 20. .. Unlike the first embodiment, the evaluation device 200 does not include a box portion, an elastic portion, and a non-woven fabric. The convex portion 224 has a shape that tapers toward the upper side, and the resin fiber 10 is spread and placed so as to be inserted into the convex portion 224. The upper tip of the convex portion 224 does not protrude from the resin fiber 10.

In the evaluation method of the resin fiber 10, first, the load cell 50 is displaced upward according to the instruction of the control unit 60, and the mounting member 230 is pulled to the left by the string portion 240 connected to the load cell 50. Then, the control unit 60 measures the distance at which the load cell 50 is displaced upward and the tensile load detected by the load cell 50 with respect to the displacement. At this time, the main body portion 32 of the plate portion 31 of the mounting member 230 is in contact with the resin fiber 10 and is locally supported by the resin fiber 10 inserted into the convex portion 224, so that the amplitude is effective. Can be amplified to.

<Other embodiments>
The present invention is not limited to the embodiments described by the above description and drawings, and for example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not deviating from the gist other than the following. It can be changed in various ways.

(1) In addition to the above embodiment, the material of the elastic portion can be changed as appropriate. In the above embodiment, the elastic portion is a spring, but the elastic portion is not limited to this. For example, the elastic portion may be rubber. Further, the string portion may have elasticity (extension that extends in the pulling direction) as a whole.

(2) In addition to the above embodiment, the configuration of the mounting member can be changed as appropriate. For example, the mounting member may be a hollow rectangular parallelepiped whose upper part is closed by a lid. In that case, the lower portion of the mounting member may be rounded so that the mounting member does not slip into the resin fiber. Further, the plate portion is not limited to the metal one, but may be made of glass or resin.

(3) This technique can be applied to a resin fiber inspection program. The resin fiber inspection program is a program that causes a computer (for example, a control unit 60) to execute the following processing. Specifically, it is an evaluation program for resin fibers composed of at least resin, in which a mounting member placed on the spread resin fibers is pulled at a constant speed, and the tensile load of the mounting member is measured. This is a resin fiber evaluation program that executes an evaluation process for evaluating resin fibers based on the measured fluctuation amplitude of the tensile load. The resin fiber evaluation program can be recorded on a recording medium such as a ROM.

(4) In the above embodiment, the evaluation method of the resin fiber used for manufacturing the door trim attached to the door of an automobile has been exemplified, but the present invention is not limited to this. For example, in the evaluation method of resin fibers used for interior materials provided in vehicles such as trains and amusement vehicles as ground vehicles, airplanes and helicopters as flight vehicles, ships and submersibles as marine and underwater vehicles. There may be. Further, it may be an evaluation method of a resin fiber used for manufacturing other interior materials such as an instrument panel, a roof lining, and a pillar garnish.

10 ... resin fiber, 21 ... box part, 30,230 ... mounting member, 31 ... plate part, 40,240 ... string part, 41 ... elastic part, 50 ... load cell (detection part), 51 ... elevating part, 60 ... Control unit, 100, 200 ... Evaluation device, 224 ... Convex part

Claims (5)

At least a method for evaluating resin fibers composed of resin.
The mounting member placed on the spread resin fiber is pulled at a constant speed, the tensile load of the above-mentioned mounting member is measured, and the resin fiber is evaluated based on the measured amplitude of the fluctuation of the tensile load. A method for evaluating a resin fiber, which is characterized by the fact that the resin fiber is evaluated. The method for evaluating a resin fiber according to claim 1, wherein the amplitude is amplified. The method for evaluating a resin fiber according to claim 2, wherein the amplitude is amplified by pulling the above-mentioned placing member by a string portion provided with an elastic portion having elasticity. The resin fiber according to claim 2, wherein the resin fiber is spread over a plurality of convex protrusions, the previously described member is placed, and the amplitude is amplified by pulling the previously described member. Evaluation method. The resin fiber is displaced based on the average value of the amplitudes while the detection unit for detecting the tensile load is displaced, the above-mentioned placement member is pulled by the string portion connected to the detection unit, and the member is pulled within a predetermined range. The method for evaluating a resin fiber according to any one of claims 1 to 3, wherein the evaluation is performed.

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