JP2000350696A - Dust-control rental mat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust-control rental mat economically by enhancing the dust collecting property of the mat, making inconspicuous the dirt consisting of the attracted dust so as to extend a rental cycle to thereby reduce the frequency of washing and increase durability, and saving the labor required for replacement in recycling and re-renting. SOLUTION: This dust-control rental mat is formed by inserting three or more kinds of pile yarns of different colors into a ground fabric 11 to selectively form cut piles 19 and loop piles 20 on a tufted pile fabric, then applying a rubber adhesive to the back face of the tufted pile fabric to secure the piles to the ground fabric 11, then pressing an unvulcanized rubber sheet against the surface to which the rubber adhesive is applied, and performing heat vulcanization.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust control rental mat which is laid at entrances and exits indoors and outdoors to adsorb dust on shoe soles adhered outdoors to prevent entry into the interior.

[0002]

2. Description of the Related Art A rental mat of this kind is used in a rental system which is lent to a customer, collected and washed every time a certain period of use, dust-absorbed, and lent again.

[0003]

As described above, the dust control rental mat is used for the purpose of adsorbing dust, and when used, mineral oil such as spindle oil, machine oil, paraffin, etc. is used in order to enhance dust collection. The dust surface is treated with oil, an oil-soluble anionic surfactant, a nonionic surfactant or the like, so that the pile surface is easily contaminated, the rental cycle of collection and re-lending is short, and the pile is washed repeatedly and frequently. For this reason, the dust control rental mat is required to have high durability to withstand severe use conditions in terms of physical properties such as abrasion resistance and discoloration resistance of the pile surface.

[0004]

It is an object of the present invention to improve the dust collecting property of a dust control rental mat, lengthen a rental cycle by making dirt from adsorbed dust inconspicuous, and reduce the frequency of cleaning by doing so, thereby improving durability. It is another object of the present invention to provide a dust control rental mat economically by reducing labor for replacement associated with collection and re-lending.

[0005]

In the dust control rental mat according to the present invention, the pile yarn 34 is inserted into the base cloth 11 and a rubber adhesive 46 is applied to the back surface of the tufted pile ground where the pile is formed. The unvulcanized rubber sheet 4 is fixed to the cloth 11 and the surface of the rubber
7 is formed by pressing and heating and vulcanizing, and the pile yarns 34 are three or more kinds of different colors having different colors, and each of the cut piles 1 protrudes from both ends of the back stitch 43 in a U-shape.
The first feature is that a loop pile 20 that protrudes in a loop shape continuously from the rosary via the back stitch 43 is selectively formed.

A second feature of the dust control rental mat according to the present invention is that, in addition to the above-described first feature, the pile yarn 34 contains thick fibers of 10 denier or more and ultrafine fibers of less than 1 denier. It is in.

A third feature of the dust control rental mat according to the present invention is that, in addition to any one of the first and second features, the loop pile 20 includes a long loop pile 20a and a short loop pile 20b having different pile lengths. And two or more types.

[0008]

FIG. 1 is a cutaway view of a part of the rear surface of a dust control rental mat according to the present invention, and a back stitch 43 is continuously formed in a zigzag manner in the longitudinal direction N of the base cloth 11. The turning point 44 of the back stitch 43 continuous with the zigzag is also continuous zigzag in the longitudinal direction of the base fabric, and the adjacent back stitch 43 and back stitch 4
The boundary 45 is not streaked on the pile surface of the dust control rental mat.

As the pile yarn, use is made of cellulosic fibers such as hemp, cotton and rayon, and thermoplastic synthetic fibers such as polyamide fibers (wool fibers and nylon), polyester fibers, acrylic fibers and vinylon. Preferred fibers are cotton, rayon, and hygroscopic fibers such as crosslinked acrylate fibers having a water retention of 20% or more and high hygroscopic acrylic fibers. These fibers are polyamide fibers, polyester fibers, general acrylic fibers, vinylon, and the like. Used in combination with etc. The hygroscopic fiber may be used for at least one of three or more different kinds of pile yarns of different colors. The water retention rate of the hygroscopic fiber was determined by centrifuging a sample fiber sufficiently immersed in water at a rotation speed of 2000 rpm (rotation radius 1
0 cm) for 5 minutes, and the difference between the weights of the sample fibers before and after the centrifugation is divided by the weight of the sample fibers after the centrifugation. To improve dust collection by the pile brush action, fibers of 10 denier or more should be used for the pile yarn. However, in order to increase the water retention of the pile and the adsorbability of dust to the pile, an ultrafine fiber of less than 1 denier is used. Fibers may be used for the pile yarns, and it is therefore recommended that the pile be made of a mixture of thick fibers of 10 denier or more and ultrafine fibers of less than 1 denier.

The three or more types of pile yarns of different colors may be composed of different fibers such as hemp pile yarn, rayon pile yarn, nylon pile yarn, polyester fiber pile yarn, acrylic fiber pile yarn, etc. The differences in the colors of the three or more types of pile yarns of the different colors may be due to the difference in the color or gloss inherent to the fibers constituting the pile yarns.

As the base fabric, a non-woven fabric and a woven fabric are used. In order to enhance the adhesiveness with a rubber adhesive or a rubber sheet, it is preferable to raise the back surface of the base fabric, that is, the back stitch side. In particular, in the case of a woven fabric using tape yarns for the warp and the weft, in order to enhance the adhesiveness with a rubber adhesive or a rubber sheet, a fiber web is laminated on the surface of the base fabric (woven fabric), that is, on the pile surface side. It is preferable to perform needle punching to project the fiber fluff to the back side of the base fabric.

FIG. 2 shows three or more types of pile yarns 34 of different colors.
FIG. 1 shows a tufted machine for selectively forming a cut pile 19 and a loop pile 20 by inserting a needle into a base cloth 11, comprising a needle shift means, an intermittent base cloth feeding means and a needle selection means, and a needle for each stitch cycle. Yarn feed adjusting means for adjusting the amount of pile yarn to be sent out, and cut pile / loop pile selecting / forming means for selecting whether the pile yarn loop received by the looper should be a loop pile or a cut pile. . The needle shift means includes a needle bar 22 that supports a large number of needles 21 so as to be able to move up and down, and a cam device 23 that reciprocates the needle bar 22 in the width direction of the tufted machine. The intermittent base cloth feeding means is a spike roll 2 for feeding the base cloth.
4 and a servo motor 25 that intermittently drives the spike roll 24 to rotate. The needle selecting means is constituted by a push bar (not shown) for driving a number of needle holders 26 up and down, and a pattern control device 27 for controlling engagement and disengagement of the needle holder 26 and the push bar. Are mounted on the lower end of each needle holder 26.

The cut-pile / loop-pile selecting / forming means cooperates with the knife 18 to cut the pile yarn loop 30 to make a cut pile. A clip 31 for preventing the loop 30 from coming off the looper,
The clip 31 includes a clip driving device 32 that controls the opening and closing of the tip of the looper by changing the contact position of the clip 31 with the looper 12. When the clip 31 is advanced, the pile thread loop 30 is disengaged from the looper. When the clip 31 is retracted, the pile yarn loop 30 separates from the looper to form a loop pile. The thread feed adjusting means includes a clutch-in roll 29 having a built-in clutch 28 and the rotation speed of which is controlled by the clutch. The length is adjusted, and the long loop pile 20a and the short loop pile 20b are selectively formed.

The cam device 23 of the needle shifting means, the servomotor 25 of the intermittent base cloth feeding means, the pattern control device 27 of the needle selecting means, the clutch 2 of the yarn feeding adjusting means
8, and the clip driving device 32 of the cut pile / loop pile selecting / forming means is operated synchronously via the computer 33, so that the required color is obtained at the required position on the base fabric by the required pile yarn 34. Long cut piles 19 or loop piles 20 are selectively implanted.

The needle shift means is described in
0-15185, JP-B-54-43939, JP-B-56
-13819 and JP-A-55-26213. Needle selection means are described in JP-B-46-14227, JP-B-54-10906, and JP-B-5-10906.
7-4366, JP-A-59-179863, JP-A-60-17963
-39466, JP-A-60-88166, JP-A-63-1988.
It is disclosed in 135553 and the like and is well known. Regarding the yarn feed adjusting means, see JP-A-43-9872 and JP-A-44-9872.
-12071, Japanese Patent Application Laid-Open No.
40628, JP-A-45-19144, JP-A-46-1
1912, JP-B-55-32822, JP-B-57-30
415, JP-B-50-16985, JP-B-55-239
44, JP-B-57-8707, JP-B-44-3395,
It is publicly known as disclosed in JP-A-50-118860. The cut pile and loop pile selection forming means are described in JP-B-39-16426 and JP-B-59-317.
52, JP-B-62-19539, JP-B-62-2189
7. It is disclosed in JP-B-61-35303 and the like and is well known. All of these known needle shift means, needle selecting means, yarn feed adjusting means, cut pile / loop pile selecting / forming means, and cut pile / loop pile combined looper can be applied to the present invention.

Between the base cloth 11 and the looper 12,
3 is directed in the direction of transport of the base cloth, the brush root 17 is located at a position where the follicle 14 has receded from the needle operating position 15 and is in contact with the loop pile 16 immediately after planting, and the brush 17 is reciprocated in the transport direction of the base cloth. Brush driving means is mounted. The brush nap (17) has a single yarn fineness of 10
It is preferable to use synthetic fibers of 0 to 500 denier.

In FIG. 2, reference numeral 40 denotes a locking shaft for reversing forward and backward. An arm 41 attached to the locking shaft 40 and a locking arm 37 are connected by a connecting rod 42. The looper 12
It is carried by a locking arm 37 attached to a looper shaft 36 and reciprocally driven in the transport direction of the base cloth 11. For this reason, a looper shaft 36 is used for the brush driving means, and the locking arm 37 is formed in a horseshoe shape protruding to a position facing the looper 12, but another arm 37 similar to the locking arm 37.
a to the looper shaft 36 and the looper 1
The brush 17 may be attached to the upper end of the arm facing 2. The base cloth 11 is supported by the finger needle 35 at a needle operating position 15 where the needle 21 moves up and down to be inserted into the base cloth. Therefore, the brush 17 is driven such that the bristle tip 13 reciprocates back and forth around the needle operating position 15 in parallel with the base cloth 11 below the finger needle 35.

A large number of adjacent needles 21 arranged in the width direction are grouped according to the number of types of pile yarns 34,
Pile yarns 34 of different colors are respectively drawn into a plurality of adjacent needles 21 corresponding to the number of types of the pile yarns 34, and are stopped without transporting the base fabric 11 for several stitch cycles. Next, the needle 21 is moved in the width direction of the tufted machine by one needle gauge every one stitch cycle, and the loopers 12 arranged with the same gauge as the needle gauge in the width direction of the tufted machine are used to form pile yarns 34 of different colors. The needle 21 is selectively inserted into the base cloth 11 so as to receive the pile yarn loop 30 from any one of the needles 21 of the plurality of sets.

FIG. 3 is a side view of a main part of the tufted machine. In one stitch cycle, the needle 21 and the loop 12 operate in the order of (a), (b), (c) and (d), After this series of operations is completed, the needle 21 moves by one needle gauge in the width direction of the tufted machine, moves to the next stitch cycle, and again in the order of (a), (b), (c) and (d). Operate. The base cloth 11 is made of the pile yarn 34.
Are stopped for several stitch cycles corresponding to the number of types, the base fabric 11 is conveyed by one stitch gauge after the operation of the series of several stitch cycles is completed, and the process proceeds to the next several stitch cycles again. The looper 12 is a base cloth 1
1 receives the pile yarn loop 30 from the needle 21 in any one stitch cycle of several stitch cycles according to the number of types of the pile yarn 34 in the stopped state. Therefore, when the needle 21 is not selected in one stitch cycle shown in the drawings (a), (b), (c), and (d), the needle 21 is not inserted into the base cloth 11,
Accordingly, the looper 12 does not receive the pile thread loop 30.

As shown in FIG. 3 (a), the pile thread loop 30 delivered to the looper 12 from the needle 21 which has been moved down by raising the nap (17), as shown in FIG. When the brush 17 retreats from the operating position 15, the brush 17 advances in the transport direction of the base cloth 11, so that when the brush 17 comes off the looper 12 as shown in FIG. , Is pushed back in the transport direction of the base cloth by the advancing brush (17). In order to prevent the nap (17) of the brush from entering into the loop of the pile thread loop 30, the needle (21) inserted into the base cloth (11) is raised.
7), the nap is lowered to the operating position of the looper so as to separate the nap, and the position of the bristle tip 13 is set so that the pile thread loop 30 is transferred to the looper 12 under the nap (17). Good.

In FIG. 3, the clip 31 is at the retracted position so as not to prevent the pile yarn loop 30 from coming off the looper 12, but when the cut pile 19 is formed, the clip 31 is moved to the needle operating position 15. It is placed in the pushed position so as to protrude beyond. Then, the pile thread loop 30a is locked to the looper at a position deeper in the looper than the tip end 38 of the clip pressed against the looper 12, and is not disengaged from the looper by the clip 31. In the stitch cycle shown in FIG. 3, as shown in FIG.
Then, the cut pile 19 is cut by the looper 12 and the knife 18.

In some cases, the base cloth 11 is not conveyed even when the needle is pulled out to be in a free state, and is shifted to the next stitch cycle without stopping. However, in this tufted machine, the intermittent base fabric transported in one stitch cycle out of several stitch cycles is performed, and each looper is driven by any one of the intermittent base fabric feeds in one cycle. In one stitch cycle, one pile is formed in cooperation with any one needle. For this reason, in the next stitch cycle (FIG. 3A) which is continuously performed while the base cloth is not conveyed, the looper 12 formed with the previous loop pile 16 (FIGS. 3C and 3D) is piled up. And is not inserted into the base cloth 11. Accordingly, a chain stitch does not occur in a stitch cycle during a period in which the base fabric 11 is in a stopped state from the time when the loop pile 16 (FIGS. 3C and 3D) is implanted to the time when the next pile is conveyed.

Of course, the looper where the loop pile 16 is already planted and the needle 21 is not inserted in one cycle of the intermittent feeding of the base cloth may be any one of the loopers until the next base cloth is conveyed. Is carried by the rocking arm 37 together with the other loopers that will form the pile in the stitch cycle, and is reciprocated to the needle operating position 15, and the looper 12 advances toward the needle operating position 15. Time (Fig. 3a), looper 1
As the brush 17 retreats in synchronization with the second, the previous loop pile 16 (FIGS. 3c and 3d) is gently pinched between the naps until the base fabric is conveyed in any subsequent stitch cycle. The brush 17 is pushed back toward the cloth transport direction.

In practice, however, the brush standing space (17)
Since the hair root 14 is denser than the hair tip 13 in the open state, the loop pile 16 (FIG. 3)
3c) and FIG. 3d), even if the hairs are pinched between the raised hairs, they do not penetrate deeper into the hair roots 14 but move toward the coarser hair tips 13 and easily come out of the hair tips 13. When both the brush 17 and the looper 12 reciprocate back and forth around the needle operating position 15 without inserting the needle in the next stitch cycle, as shown in FIG. It will be pushed out in the direction. Even if it is not pushed out from the bristle tips 13, the loop pile 16 moves in the direction of the brush roots 13, that is, in the direction opposite to the direction in which the base cloth is conveyed, before the base cloth 11 is conveyed. Therefore, the looper 12 forming the loop pile 16
The process of forming the next pile (FIGS. 3c and 3d)
No chain stitches occur in a).

As described above, the brush 17 pushes back the previous loop pile 16 so as not to protrude to the needle operating position 15, and is used for holding the previous loop pile 16 between the naps (17). However, since the loop pile 16 is more likely to come off the brush 17 as the density of the nap (17) at the tip of the nap is coarse, the density of the nap is such that the loop pile is securely sandwiched between the nap. There is no need to be elaborate.

As described above, between the base cloth 11 and the looper 12, the bristle tip 13 is directed in the conveying direction of the base cloth, the follicle 14 is set at a position retreated from the needle operating position 15, and the loop pile 16 immediately after planting is formed. Is provided, and the brush 17 is reciprocally driven in the transport direction of the base cloth. Therefore, the dark-color cut pile 19 and the light-colored loop pile 20 by different kinds of pile yarns 34 are mixed, and the number of pile yarns As described above, a variety of tufted pile grounds with various changes can be efficiently obtained.

Acrylonitrile / butadiene rubber, urethane rubber, styrene / butadiene rubber, chloroprene rubber, ethylene / propylene rubber, ethylene / propylene / diene rubber are used as the rubber adhesive applied to the tufted pile. When it is desired to increase the thickness, an unvulcanized rubber sheet of the same quality as the rubber adhesive is superimposed, heated under pressure, and bonded simultaneously with vulcanization. Vulcanization accelerators are used together with sulfur for vulcanization of rubber adhesives and unvulcanized rubber sheets, but benzothiazyl disulphide and mercapto benzo are used to improve the light resistance and discoloration resistance of the pile surface. It is recommended that zinc thiazole, 2-mercaptobenzimidazole, 2-mercaptobenzothiazole and hexamethylenetetramine be used as vulcanization accelerators. The applied amount of the rubber adhesive is 40 to 700 g / m ² (dry weight),
The thickness of the unvulcanized rubber sheet is 2 to 7 mm. The pressing force of the unvulcanized rubber sheet against the tufted pile is 3 to 10k.
g / cm ² and heated at 150-160 ° C. for 10-20 minutes for vulcanization.

On the pile surface of the dust control rental mat, 5 to 100% by weight of a dust collecting agent is applied and adsorbed in order to enhance the dust collecting property. Dust collectors include beeswax, molle, microcrystal wax,
Melting point of candelilla wax, bayberry wax, etc. 30-85 ° C
Oils such as waxes, paraffin oil, spindle oil, machine oil, α-olefin oil, polyglycol oil, alkylate oil, castor oil, olive oil, camellia oil, oil-soluble anionic surfactants and nonionic surfactants are used. You.
The oil agent may be prepared and used as an emulsion in which a surfactant such as an oil-soluble anionic surfactant or a nonionic surfactant is blended so as to be easily adsorbed on the pile surface.

Examples of the dust collecting agent include an amidophosphazene compound, N (fluorodiclomethylthio) phthalimide,
Dihaloalkylallyl sulfone, N ・ N ・ dimethyl ・
N'-phenyl (N-fluorodichloromethylthio) sulfamide, di-iodomethyl-P-tolylsulfone,
2,2'-hydroxy-5,5'-dichlorodiphenylmethane (G-4, dichlorophene), 2, promo-2
・ Nitropropane ・ 1.3 ・ diol, phenoxyethanol, 2 (thiocyanatomethylthio) benzothiazole, 2 ・ benisomidazolyl ・ carbamic acid methyl ester, benzimidazole, P ・ hydroxymethylbenzoate, diphanyl ether (silicone) Quaternary ammonium salt, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, α-promcinnamaldehyde, 4, chloro-m-cresol-chloro-3,5
・ Xylenol, 5 ・ methyl ・ 2 (1 ・ methylethyl)
Phenol, 2, 2 ', methylene bis (3, 4, 4'
Trichlorophenol), 2.2, thiobis, 4.6,
Dichlorophenyl, 3 (trimethoxysilyl) propyloctadecyldimethylammonium chloride, N.
Benzyl N-dodecyl methyl (2-hydroxyethylsulfonyl) propyl ammonium bromide, 1.
3, dicyano, 2, 4, 5, 6 tetrachlorobenzene,
It is preferable to mix antibacterial and fungicide agents such as zinc-2 pyridimol / 1 oxide and sodium pyridinethiol / 1 oxide.

Further, a deodorant such as a metal complex of carboxyphthalocyanine and L-ascorbic acid / iron (2) compound may be added to the dust collector. Sodium ion by copper ion, zinc ion, mercury ion, tin ion, lead ion, bismuth ion, cadmium ion, chromium ion, thallium ion, ammonium ion, etc.
Zeolite, sepiolite (hydrous magnesium silicate) and copper powder, which have been replaced with ion-exchangeable ions such as calcium ion, potassium ion, magnesium ion and iron ion, are kneaded into a synthetic fiber polymer and spun to produce antibacterial and deodorant properties. A pile yarn may be prepared.

[0031]

The upper end face of the cut pile 19 constituting the pile surface of the tufted pile is constituted by countless fiber cross sections and countless minute gaps between the fibers, and the light hitting the pile surface is extremely narrow. Since light enters the fine gaps between the deep fibers, the reflectance of light on the pile surface is reduced.
On the other hand, the upper end surface of the loop pile 20 is formed by the innumerable curved side surfaces of the fibers, and the side surfaces of the fibers have the same specular gloss as the surface of the plastic film of the same material. Is higher than the cut pile 19. For this reason, even if the pile yarns 34 are formed, the cut pile 19 becomes darker, the loop pile 20 becomes lighter, and both become different colors. As a result, the number of colors of the pile yarns is displayed on the pile surface. The color effect is twice as large as that of the above, so that it becomes extremely versatile, and the dirt caused by the dust adsorbed there becomes less noticeable. Therefore, the rental cycle can be lengthened, the cleaning frequency is reduced by that much, and the collection and re-lending are performed. Labor is reduced due to
In addition, not only the cut pile 19 gripped by the base fabric in a U-shape, but also the pile surface is constituted by the loop pile 20 in which fibers are connected in a daisy chain via the back stitch 43, so that dust control with excellent durability is achieved. Rental mats can be provided economically.

The loop pile 20 forming the loop structure is
Unlike the cut pile 19 having the long pillar structure, the buckling stress does not act, and the loop pile 20 supports the cut pile 19, so that the cushioning property of the dust control rental mat is improved, and unlike the case of the cut pile 19, the loop pile 20 is not used. Dust is easily trapped, and the dust that has entered the inside of the walnut structure does not easily scatter outside. As a result, the dust collecting property of the dust control rental mat is enhanced, and in particular, the pile yarn has a denier of 10 denier or more. When a thick fiber and an ultrafine fiber of less than 1 denier are mixed (claim 2), the brush action by the thick fiber, the water retention function of the ultrafine fiber, and the dust adsorption function enhance dust collection properties. The amount of dust collecting agent that can easily contaminate the entire pile surface can be reduced, and as a result, Can also lengthening the rental cycle, and, easily washed becomes also dust-collecting agent contained in the washing drainage even fewer, washing treatment drainage is facilitated.

When the pile surface is colored with a cut pile 19 and a loop pile 20 of three or more different colors and different shades, and the loop pile is made up of a long loop pile 20a and a short loop pile 20b of different heights (claim 3), Dust falls into the short loop pile 20b, and the dust collecting property is further enhanced. In addition, the height difference between the long loop pile 20a and the short loop pile 20b appears, and the three-dimensional appearance of the pile surface is deepened. A novel and colorful dust control rental mat can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway rear perspective view of a dust control rental mat according to the present invention.

FIG. 2 is a side view of a tufted machine used for carrying out the present invention.

FIG. 3 is a side view of a main part of the tufted machine used in the embodiment of the present invention, and shows a pile planting process by using (a), (b), (c), and (d).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Base cloth 12 Looper 13 Hair tip 14 Hair root 15 Needle operation position 16 Loop pile of tip 17 Brush 18 Knife 19 Cut pile 20 Loop pile 21 Needle 22 Needle bar 23 Cam device 24 Spike roll 25 Servo motor 26 Needle holder 27 Pattern control Apparatus 28 Clutch 29 Clutch-in roll 30 Pile thread loop 31 Clip 32 Clip drive device 33 Computer 34 Pile thread 35 Finger needle 36 Looper shaft 37 Locking arm 38 Clip tip 40 Locking shaft 41 Arm 42 Connecting rod 43 Back stitch 44 Turning point 45 Boundary 46 Rubber adhesive 47 Rubber sheet N Length direction of base cloth

Claims (3)

[Claims] 1. A rubber adhesive is applied to the back surface of a tufted pile ground in which a pile yarn is inserted into a base cloth to form a pile, and the pile is fixed to the base cloth. A rubber sheet is pressed and heated and vulcanized. Pile yarns of three or more different colors with different colors. Cut piles protruding from both ends of the back stitch in a U-shape, and beads are connected via the back stitch. A dust control rental mat characterized by selectively forming loop piles continuously protruding in a ring shape. 2. The dust control rental mat according to claim 1, wherein the pile yarn according to claim 1 contains thick fibers of 10 denier or more and ultrafine fibers of less than 1 denier. 3. The loop pile according to claim 1, wherein
Long loop pile and short loop pile with different pile lengths
The dust control rental mat according to claim 1, which is of a kind or more.