JP6104520B2 - Manufacturing method and manufacturing apparatus of recycled short fiber material, recycled short fiber material, mortar, concrete including the same, and greening base - Google Patents

Description

  The present invention relates to a manufacturing method and a manufacturing apparatus of a recycled short fiber material useful for preventing cracks generated after construction of a mortar / concrete spraying method or a greening spraying method in slope protection, and mortar / concrete and a greening base including the recycled short fiber material. About.

  Conventionally, when the mortar / concrete spraying method for slope protection is applied, dripping (sedimentation) of the material sprayed after the construction or plastic shrinkage (after the concrete is poured, the concrete is still in a plastic state where the concrete is not yet fully cured. When the surface is dried, the cement may shrink, resulting in cracks (cracks) due to irregular cracks generated on the surface. In mortar / concrete spraying methods, which are often applied on steep slopes, sagging often directly causes cracks. Normally, cracks are prevented by appropriate construction management and moisture curing, but cracks are reliably prevented in mortar / concrete spraying methods that require construction under severe site and weather conditions. Since the methods that can be used are limited, it is known to use a short fiber reinforced concrete obtained by mixing various short fiber materials with a concrete compounding material in a mortar / concrete spraying method for slope protection. Thereby, effects such as reinforcement, sagging prevention, and crack prevention can be expected (see Non-Patent Document 1 and Non-Patent Document 2).

  Examples of short fiber materials that are generally mixed with concrete compounding materials for reinforcement include metal fibers such as steel fibers, stainless steel fibers, inorganic fibers such as glass fibers, carbon fibers, ceramic fibers, and synthetic fibers. Some aramid, nylon, vinylon, polyethylene, polypropylene and the like are known (see, for example, Patent Document 1). However, in actual sites, vinylon and polypropylene, which are easy to handle and construct, are relatively inexpensive and economical, are often used.

  When the amount of the short fiber material is increased in the material, it becomes difficult to uniformly disperse the fiber in the cement-forming material such as cement, fine aggregate, and coarse aggregate. Are intertwined or fiber balls are generated, making it difficult to obtain the desired reinforcing effect. Further, even if the fibers are uniformly dispersed in the cement molded body, the fluidity of the cement-formed body when fresh is significantly reduced due to the binding force of the fibers.

  Therefore, as a method for uniformly dispersing the short fiber material in the cement molding material, Patent Document 2 discloses an aspect ratio (a value obtained by dividing the fiber length by the fiber diameter) in a water-soluble or water-dispersible liquid. A short fiber pre-dispersion having a high dispersion stability in which short fibers are dispersed and a method for producing the same are proposed. Patent Document 3 proposes a fiber processed as a short fiber material having a single yarn fineness of 0.5 to 100 dtex and an aspect ratio of 50 to 1000 to which a treating agent is applied. Further, Patent Document 4 discloses a fiber-mixed concrete composition in which a short fiber is continuously fed to a mixer, a spray nozzle for spraying a concrete composition, or a belt conveyor while cutting a long fiber of an organic fiber with a fiber cutting machine. A fiber reinforced concrete placement method that sprays this on the base has been proposed. Furthermore, in Patent Document 5, the mixed fiber material and mortar obtained by simultaneously cutting two or more types of fibers with a roving cutter are individually pumped through a pump and an air compressor, and these are merged and mixed inside the spray gun, A method for supplying reinforcing fibers in mortar spraying on a painted surface has been proposed.

  On the other hand, in the greening spraying method for slope protection, a turtle shell-shaped crack may occur due to drying shrinkage after the construction. In the case of the greening spray method, the occurrence of cracks does not have an adverse effect, but if drying progresses further, rainwater, etc. concentrates on the cracks, causing erosion and peeling of the surface layer. May occur. In particular, greening base (growth base) with low fiber content and guest soil sprayer (compressor, gun and other spraying machines are used to mix seeds and fertilizer and add water to make a mud mixture. Cracks are likely to occur when earth and sand are used as the main material, as in the method of spraying.

  Therefore, in Patent Document 6, the concept of short fiber reinforced concrete is applied to a greening method for slopes, and greening materials are mixed with fibers having a single fiber fineness of 0.7 to 120 dtex and an aspect ratio of 120 to 1300. Materials have been proposed. As a result, for example, it is possible to omit the wire netting work as the greening foundation work that was necessary in the construction such as the conventional thick layer base material spraying method.

JP 2004-232258 A JP-A-6-293540 JP 2010-275156 A Japanese Patent Laid-Open No. 5-293818 JP-A-7-113325 JP 7-327484 A

Japan Society of Civil Engineers (2005), shotcrete guideline (draft) Japan Society of Civil Engineers (2007), concrete standard specifications

However, most of the proposals mentioned above are related to the dispersion of concrete short fiber materials and the placement of concrete, and are not directly aimed at preventing cracks after the construction of the mortar / concrete spray method for slope protection. Absent. Moreover, the aspect ratio of the short fiber material mix | blended with a concrete formation shows the tendency for a suitable range and an effect to differ greatly with the kind of fiber. Conventionally, in the mortar / concrete spraying method, a short fiber material typified by relatively inexpensive polypropylene is used. However, the certainty of the effect is low at present. Furthermore, since the construction method as disclosed in Patent Document 4 or 5 is costly, it is difficult to use it at an actual site.
Also, in the greening spraying method, in recent years, from the viewpoint of cost reduction, netting work (such as wire netting work or resin netting work) that is usually applied as a greening foundation work may be omitted. Therefore, there is a demand for a method for preventing the occurrence of cracks and further improving the durability of the greening base.
On the other hand, in recent years, a lot of recycled materials have come to be used in civil engineering work sites due to social demands. However, short fiber materials are generally manufactured in batches at factories. For this reason, in order to efficiently cut the long fiber material used as a raw material, a raw material yarn having a uniform tension (yarn tension) is used. For this reason, the utilization of recycled materials in short fiber materials has not progressed, and no proposal has been made. Since the raw materials of vinylon and polypropylene that are often used as short fiber materials are natural resources, it is required to use recycled materials as much as possible.

  The purpose of the present invention is to produce a recycled short fiber material useful for preventing cracks generated after construction of a mortar / concrete spraying method or a greening spraying method in slope protection, utilizing residual yarn generated in the process of commercializing a textile product. It is to provide a mortar-concrete and a greening base comprising methods and production equipment and recycled short fiber materials.

In order to achieve the above object, the present invention provides the following configurations.
The present invention according to claim 1 is a method of manufacturing a recycled short fiber material using a residual yarn of a wound paper tube, and bobbins the residual yarn that is a long fiber drawn from the plurality of paper tubes. And a second step in which the remaining yarn bundle wound around the bobbin in the first step is sequentially pulled out by a cutting device and cut into a predetermined length.

  The present invention according to claim 2 is the method for manufacturing a recycled short fiber material according to claim 1, wherein the recycle short fiber material is wound around the bobbin in the first step between the first step and the second step. And a step of winding the remaining yarn bundle around another bobbin.

  The present invention according to claim 3 is the method for producing a recycled short fiber material according to claim 1 or 2, wherein the remaining yarn is a yarn made of polyester fiber.

  This invention which concerns on Claim 4 is a manufacturing method of the recycle short fiber material of Claims 1-3, Comprising: The said recycle short fiber material forms fiber length 10-50mm, and an aspect-ratio is 500-7000. It is characterized by being.

  The present invention according to claim 5 is a manufacturing apparatus used in the method for manufacturing a recycled short fiber material according to any one of claims 1 to 4, wherein the cutting apparatus uses a remaining yarn bundle drawn from the bobbin. A remaining yarn bundle pulling means for sequentially pulling out the remaining yarn bundle from the bobbin sandwiched between a pair of endless belts, and pressing the remaining yarn bundle pulled out by the remaining yarn bundle pulling means from above, thereby laterally shifting the remaining yarn bundle. It is characterized by comprising a lateral deviation preventing means for preventing and a cutting means for cutting the remaining yarn bundle pressed by the lateral deviation preventing means.

The present invention according to claim 6 is a recycled short fiber material obtained by cutting a bundle of remaining yarns of a plurality of wound paper tubes , which are polyester fibers of various forms that are generated and recovered in the process of commercializing a textile product. The fiber length is one selected between 10 mm and 50 mm , and the aspect ratio is dispersed in the range of 500 to 7000.

The present invention according to claim 7 is mortar / concrete and contains the recycled short fiber material according to claim 6 .

The present invention according to claim 8 is the greening for foundation, characterized in that it contains recycled short fiber material as claimed in claim 6.

In the manufacturing method of the recycled short fiber material according to the present invention, the remaining yarns, which are long fibers drawn from a plurality of paper tubes, are bundled and wound on a bobbin, and the remaining yarn bundle wound on the bobbin is sequentially pulled out by a cutting device. By cutting to a specified length, recycled short fiber material with an effective fiber length of 10 to 50 mm and an aspect ratio of 500 to 7000 is effective in preventing cracks that occur after the mortar / concrete spraying method and the greening spraying method. Can be manufactured well. In addition, the manufacturing apparatus used in the above-described manufacturing method includes a remaining yarn bundle pulling means and a remaining yarn bundle pulling means for sequentially pulling the remaining yarn bundle from the bobbin by sandwiching the remaining yarn bundle drawn from the bobbin with a pair of endless belts. Since there is a lateral deviation preventing means for preventing the lateral deviation of the residual yarn bundle by pressing the drawn residual yarn bundle from above, and a cutting means for cutting the residual yarn bundle pressed by the lateral deviation preventing means, tension is applied to the residual yarn bundle. The remaining yarn bundle can be efficiently cut without using high-pressure water (water jet) or by twisting the remaining yarn bundle, solidifying the remaining yarn bundle with an adhesive to enable cutting by shearing, or using high-pressure water (water jet). Can do.
Moreover, the recycled short fiber material manufactured by the manufacturing method of the recycled short fiber material according to the present invention is applied to the mortar / concrete spraying method or the greening spraying method in slope protection, and each material contains the recycled short fiber material. Thus, the effect of preventing cracks in the mortar / concrete or the greening base after construction can be obtained.

It is the schematic explaining the 1st process of the manufacturing method of the recycle short fiber material by this invention. (A) is a figure which shows an example of a structure of the remaining yarn bundle wound up by the bobbin at the 1st process. (B) is the schematic explaining the process which winds up the remaining yarn bundle of the manufacturing method of the recycle short fiber material by other bobbin by this invention. It is the schematic explaining the 2nd process of the manufacturing method of the recycle short fiber material by this invention. It is a perspective view explaining an example of composition of an arm attached to a bobbin. It is a front view explaining an example of the structure of the cutting device used with the manufacturing method of the recycle short fiber material by this invention.

With reference to the drawings, each step of the method for producing a recycled short fiber material according to the present invention will be described in detail.
-1st process FIG. 1: is the schematic explaining the 1st process of the manufacturing method of the recycle short fiber material by this invention. As shown in FIG. 1, a plurality of paper tube remaining yarns 10 having a remaining yarn 12 left on the wound paper tube 11 are arranged. The paper tube residual yarn 10 is placed on the floor and arranged, or a bar-like projection standing on the floor is provided on the plate, and the paper tube residual yarn 10 is inserted and arranged there, or the above-mentioned rod-like projection. It is arranged in an appropriate manner, for example, by placing the plate having the slant on the wall diagonally or vertically and inserting and arranging the paper tube residual yarn 10 there. Further, the number of the paper tube remaining yarns 10 to be arranged is preferably about 50 to 500. However, considering the cutting work in the second step, 200 to 250 is more preferable.
The remaining yarn 12 is pulled out from each paper tube remaining yarn 10 arranged by an appropriate method. Although the tensions of the drawn remaining yarns 12 are different, there is no need to bother the tensions. Then, the drawn remaining yarn 12 is passed through a guide 31 such as a pulley to form a bundle to form a remaining yarn bundle 13, and the bobbin 20 set in the yarn winding device 30 is rotated so that the remaining yarn bundle 13 is transferred to the bobbin 20. Wind up.
The yarn winding device 30 used here is not particularly limited. Also, the bobbin 20 is not particularly limited, but in this embodiment, a steel bobbin 20 having a brim diameter of 30 cm, a shaft diameter of 10 cm, and a shaft length of 20 cm was used.

-Step of winding the remaining yarn bundle on another bobbin A step of winding the remaining yarn bundle 13 wound around the bobbin 20 in the first step on another bobbin 20a is provided between the first step and the second step. May be. FIG. 2A is a view showing an example of the configuration of the remaining yarn bundle wound around the bobbin in the first step, and FIG. 2B is a remaining yarn bundle of the method for producing a recycled short fiber material according to the present invention. It is the schematic explaining the process of winding up to other bobbins.
Since the length of the remaining yarn 12 of each paper tube remaining yarn 10 is greatly different, as shown in FIG. 2A, the winding of the remaining yarn bundle 13 wound around the bobbin 20 in the first step is started. The number of remaining yarns 12 differs between the tip A and the end B, which is the end of winding. That is, at the tip A of the remaining yarn bundle 13, the tips 12a of the remaining yarns 12 are aligned, but at the end B of the remaining yarn bundle 13, the ends 12b of the remaining yarns 12 are not aligned and fall apart. It is a state. In such a state, when the remaining yarn bundle 13 is pulled out from the end B from the bobbin 20 in the next second step, the remaining yarn 12 is transferred to these when passing through the threaders 54 and 55, the guide 33, and the like. The remaining yarn bundle 13 may be difficult to be pulled out by the cutting device 40 due to being caught.
In order to avoid such catching, as shown in FIG. 2 (b), the remaining yarn bundle 13 is pulled out from the bobbin 20, and the pulled-out remaining yarn bundle 13 is passed through a guide 32 such as a pulley, and then the bobbin 30 The remaining yarn bundle 13 is wound around the bobbin 20a by rotating the 20a. The tip A and the end B of the wound remaining yarn bundle 13 are reversed by this operation.
When there is no remaining yarn 12 in the paper tube remaining yarn 10, the winding operation is interrupted, a new paper tube remaining yarn 10 is attached, and the remaining yarn 12 and the new paper tube remaining yarn 10 are pulled out. If the remaining yarn 12 is connected by, for example, tying, the front end A and the end B of the remaining yarn bundle 13 can be aligned. However, it is considered that it is not realistic in terms of time and cost to take such trouble in recycling a large amount of paper tube residual yarn 10.

-2nd process FIG. 3: is the schematic explaining the 2nd process of the manufacturing method of the recycle short fiber material by this invention. As shown in FIG. 3, a plurality of bobbins 20 or bobbins 20 a wound around the remaining yarn bundle 13 in the first step or the step of winding the remaining yarn bundle around another bobbin by an appropriate method as in the first step. Line up.
Here, in the following description and drawings, it is assumed that the second step is performed after the first step, after the step of winding the remaining yarn bundle around another bobbin. Accordingly, after the first step, the bobbin 20a becomes the bobbin 20 when the second step is performed without the step of winding the remaining yarn bundle 13 around another bobbin.
Then, the remaining yarn bundle 13 is pulled out from each of the arranged bobbins 20a. The number of bobbins 20a to be arranged is preferably 1 to 30. However, when the number of remaining yarn bundles 13 is increased, there is a concern that the frequency of welding due to an increase in load during cutting work and frictional heat at the time of cutting increases.

As a method of pulling out the remaining yarn bundle 13 from the bobbin 20a, for example, by attaching the guide arm 50 to the shaft hole 21 of the bobbin 20a, the remaining yarn bundle 13 can be smoothly pulled out from the bobbin 20a. FIG. 4 is a perspective view illustrating an example of the configuration of the guide arm 50 attached to the bobbin. The arrows shown in FIG. 4 indicate the direction in which the remaining yarn bundle 13 is pulled out. As shown in FIG. 4, the guide arm 50 includes a horizontal arm 52 that extends perpendicularly to the axial direction from the end of a rod-shaped shaft 51, and a vertical arm 53 that extends horizontally to the shaft 51 from the horizontal arm 52. And has threaders 54 and 55 at the respective ends of the horizontal arm 52 and the vertical arm 53. The horizontal arm 52 is rotatably attached to the shaft 51. The guide arm 50 is mounted by inserting the shaft 51 into the shaft hole 21 of the bobbin 20a. Then, the remaining yarn bundle 13 passes through the threading 55 of the vertical arm 53, passes through the threading 54 of the horizontal arm 52 along the vertical arm 53, and is pulled out from the bobbin 20a. When the remaining yarn bundle 13 is pulled out from the bobbin 20a, the arm 50 rotates and the remaining yarn bundle 13 can be pulled out smoothly. In addition to the guide arm 50, a shaft may be inserted into the shaft hole 21 of the bobbin 20a so that the bobbin 20a rotates and the remaining yarn bundle 13 may be pulled out.
Next, the remaining paper bundle 13 drawn out from the bobbin 20 a is guided to the cutting device 40 as a larger remaining yarn bundle 14 by passing through the guide 33. The cutting device 40 can form the recycled short fiber material 15 by sandwiching the remaining yarn bundle 14 between a pair of endless belts 41, sequentially pulling out the remaining yarn bundle 14 and cutting it to a predetermined length by the cutting portion 42. it can.

Next, the cutting device 40 used in the second step will be described with reference to the drawings.
FIG. 5 is a front view for explaining an example of the configuration of a cutting device used in the method for producing a recycled short fiber material according to the present invention. As shown in FIG. 5, the cutting device 40 includes a pair of upper and lower endless belts 41 including an upper belt 41 a and a lower belt 41 b, a cutting portion 42, a pressing rod 43, and a short fiber material guide 44. Yes.
The endless belt 41 is composed of an upper belt 41a and a lower belt 41b, which are configured by winding belts around driving rollers 41c and 41d arranged to face each other. By sandwiching the remaining yarn bundle 14 with the endless belt 41, it is possible to obtain a frictional force sufficient to pull out the remaining yarn bundle 13 from the plurality of bobbins 20a. Further, when the remaining yarn bundle 14 is bundled into a rod shape when cutting with the cutting portion 42, it can be easily cut. However, since the cutting device 40 itself imposes a heavy burden, the endless belt 41 holds the remaining yarn bundle 14 together. Since the remaining yarn bundle 14 is fed toward the cutting portion 42 so as to be flattened by being pinched, the burden on the cutting device 40 can be greatly reduced.

The cutting part 42 is preferably a saddle type or rotary blade type composed of movable teeth and fixed teeth. 3 and 5 exemplify and illustrate the case where the cutting portion 42 is of a saddle type. Generally, it is very difficult to cut the fiber bundle without applying a uniform tension. However, the fiber bundle can be easily cut even when the tension is not uniform by adopting a saddle type or a rotary blade type. Methods other than the saddle type or rotary blade type are considered unsuitable for the manufacture of recycled products because the cut surfaces are welded and the equipment is expensive.
The presser bar 43 is a plate-like body having substantially the same width as the endless belt 41, and a saw blade-like process 43 a is applied to one side in the longitudinal direction. For example, the presser bar 43 faces one side where a saw blade-like process is applied to the movable frame 45 or the like so as to synchronize with the opening / closing of the cutting unit 42 or move up and down faster than the opening / closing of the cutting unit 42. Attached. When cutting the remaining yarn bundle 14 with the scissors-type cutting portion 42, unlike the cutting by shearing, a phenomenon occurs in which each remaining yarn 12 constituting the remaining yarn bundle 14 is laterally shifted in the direction of the blade edge of the scissors. Therefore, by pressing the remaining yarn bundle 14 from above with the presser bar 42, the remaining yarn 12 is sandwiched in the concave portion, so that a resistance against the lateral displacement is generated, and the lateral displacement of the remaining yarn 12 can be prevented. Thus, the remaining yarn bundle 14 can be efficiently cut by the scissors-type cutting portion 42. Therefore, the saw blade-like processing 43a of the presser bar 43 is not limited to this, and may be a wave shape or a screw thread shape, and the remaining yarns 12 constituting the remaining yarn bundle 14 are sandwiched between the recesses. Any shape can be used as long as it has a shape and resistance to lateral displacement is generated. Further, since the presser bar 43 is synchronized with the opening / closing of the cutting part 42 or moves up and down faster than the opening / closing of the cutting part 42, the pull-out of the remaining yarn bundle 14 by the endless belt 41 is not hindered.

  The cutting device 40 sandwiches the remaining yarn bundle 14 drawn out from the plurality of bobbins 20a by the endless belt 41, and sequentially draws out the remaining yarn bundle 13 from each bobbin 20a. At the same time, the remaining yarn bundle 14 is sequentially fed toward the cutting portion 42 so as to be leveled. The fed remaining yarn bundle 14 is pressed from above by a presser bar 43 and cut to a predetermined length by a cutting portion 42 to form a recycled short fiber material 15. Thereafter, the formed recycled short fiber material 15 passes through the recycled short fiber material guide 44 and is collected at a predetermined location.

  By including the recycled short fiber material 15 manufactured by the above-described manufacturing method in the material used for the mortar / concrete spraying method or the greening spraying method in slope protection, the mortar / concrete or the greening base after each construction This is effective in preventing cracks generated in the surface. In particular, the remaining yarn 12 of the paper tube remaining yarn 10 is preferably made of polyester fiber. Polyester fiber is one of the very strong fibers, and its property is that it absorbs almost no water, its strength does not change even when wet, and it is resistant to acids and alkalis. Compared with excellent heat resistance and no change in strength even when exposed to sunlight, it has desirable properties as a short fiber material for crack prevention used in mortar / concrete spraying method and greening spraying method. . Polyester fibers have not been conventionally used as civil engineering materials because they are expensive fiber materials compared to fibers such as polypropylene. However, according to the method for producing a recycled short fiber material according to the present invention, it is possible to produce and supply a polyester short fiber material at a lower cost than a fiber material such as polypropylene.

Moreover, the recycled short fiber material 15 mixed with the mortar / concrete composition for the purpose of preventing cracks after construction by the mortar / concrete spraying method is formed so that the fiber length is 10 mm to 50 mm and the aspect ratio is 500 to 7000. Is preferred. Conventionally, for the purpose of preventing cracks in mortar / concrete after construction, short fiber materials mixed with the mortar / concrete composition have a fiber length of about 6 to 48 mm (mostly about 12 mm) depending on the applied fiber. And an aspect ratio of about 12 to 800 and a blending amount of about 0.3 to 13 kg / m ³ . In the case where the remaining yarn 12 is made of polyester fiber, the effect is exhibited by forming the recycled short fiber material 15 within the above-mentioned preferable value range. However, in consideration of the cutting efficiency by the cutting device 40, the fiber length is 20 mm. It is more preferable to blend in a range of about 35 mm, an aspect ratio of 1000 to 3500, and about 1 to 5 kg / m ³ , and a sufficient crack prevention effect can be obtained. In addition, the recycled short fiber material 15 mixed with the greening material for the purpose of preventing cracks after construction by the greening spraying method is generally the same as in the case of the above-mentioned mortar / concrete spraying method, considering the dispersibility in the greening material. Since the same tendency is recognized, the suitable fiber length and aspect ratio of the recycled short fiber material 15 are the same as those in the case of being mixed with the mortar / concrete composition described above. By mixing the recycled short fiber material 15 with the material for greening, not only the effect of preventing cracking of the greening base after construction but also the effect of reinforcing the greening base (linking effect) can be obtained. It is possible to omit the netting work (such as wire netting and resin netting) of the greening foundation work used in combination with the greening spraying method.

Hereinafter, application examples of the recycled short fiber material manufactured by the above-described manufacturing method of the recycled short fiber material according to the present invention will be shown.
(1) Application example to mortar / concrete spraying method Table 1 shows an example of the material composition of materials when a recycled short fiber material is applied to the mortar spraying method. Table 2 shows an example of the material composition of the material when the recycled short fiber material is applied to the concrete spraying method.
According to past studies, mixing mortar / concrete forming material, recycled short fiber material with 3kg / m ³ or more, may result in non-uniform stirring, but after construction with a composition of 1-3kg / m ³ It has been confirmed that it is effective in preventing cracks in mortar and concrete, or that cracks can be almost completely prevented. In addition, the compression strength (1.14 to 1.36 times) and bending strength (1.04 to 1.0) of mortar and concrete are compared between the case where the recycled short fiber material is mixed with the mortar / concrete forming material. 1.22 times) and bending toughness (1.43 to 1.81 times) were improved.

(2) Application example to greening spraying method Table 3 shows an example of the material composition of the greening material when the recycled short fiber material is applied to the thick-layer base material spraying method of the greening spraying method. Tables 4 and 5 show examples of the material composition of the material for greening when the recycled short fiber material is applied to the resource recycling type greening method of the greening spraying method.
The previous research, recycling When mixing with greening Materials for short fiber material, recycled short fiber material greening Materials for 2~5kg / m ³ by mixing, greening foundation is reclamation by spraying It has been confirmed that it is effective in preventing cracks, or that cracks can be made inconspicuous. However, in the test section in which the recycled short fiber material was blended in the material for greening 2 to 5 kg / m ³ , no significant difference in effect due to the blended amount of the recycled short fiber material was observed. However, considering an economic viewpoint together with the test results, it is considered that a suitable effect for preventing cracking of the greening base can be exhibited by blending 1 to ³ kg / m ³ of the recycled short fiber material with the greening material. .

DESCRIPTION OF SYMBOLS 10 Paper tube remaining thread 11 Paper tube 12 Remaining yarn 12a End of remaining yarn 12b End of remaining yarn 13, 13a, 14 Remaining yarn bundle 20, 20a Bobbin 21 Shaft hole 30 Thread winding device 31 Guide 40 Cutting device 41 Endless belt 41a Upper part Belt 41b Lower belt 41c Driving roller 42 Cutting part 43 Holding rod 44 Short fiber material guide 45 Movable frame 50 Guide arm 51 Shaft 52 Horizontal arm 53 Vertical arm 54, 55 Threading

Claims (8)

A method of manufacturing a recycled short fiber material using the remaining yarn of a wound paper tube,
A first step of bundling the remaining yarn, which is a long fiber drawn from a plurality of the paper tubes, and winding it on a bobbin;
And a second step of sequentially drawing the remaining yarn bundle wound around the bobbin in the first step with a cutting device and cutting the bundle into a predetermined length.   The recycling according to claim 1, further comprising a step of winding the remaining yarn bundle wound around the bobbin in the first step around another bobbin between the first step and the second step. A manufacturing method of a short fiber material.   The method for producing a recycled short fiber material according to claim 1 or 2, wherein the remaining yarn is a yarn made of polyester fiber.   The method for producing a recycled short fiber material according to any one of claims 1 to 3, wherein the recycled short fiber material has a fiber length of 10 to 50 mm and an aspect ratio of 500 to 7000. It is a manufacturing apparatus used for the manufacturing method of the recycle short fiber material in any one of Claims 1-4,
The cutting device is
A remaining yarn bundle pulling means for sequentially pulling out the remaining yarn bundle from the bobbin by sandwiching the remaining yarn bundle drawn out from the bobbin between a pair of endless belts;
A lateral deviation prevention means for preventing lateral displacement of the remaining yarn bundle by pressing the residual yarn bundle drawn out by the residual yarn bundle drawing means from above;
An apparatus for producing a recycled short fiber material, comprising: cutting means for cutting the remaining yarn bundle pressed by the lateral slip prevention means. Recycled short fiber material produced by cutting a bundle of remaining yarns of a plurality of spooled paper tubes , which is a polyester fiber of various forms that is generated and collected during the production of a textile product, and has a fiber length of 10 mm to 50mm is selected one of the length is between and recycled short fiber material, characterized in that the aspect ratio is dispersed in a range of 500 to 7000.   A mortar / concrete comprising the recycled short fiber material according to claim 6.   A greening base comprising the recycled short fiber material according to claim 6.

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