APRON BAND FOR SPINNING

Abstract

 An apron band for spinning including a rubber layer and a resin layer that is attached to the rubber layer. The rubber layer contains a nitrile rubber and an ethylene propylene diene rubber, and the resin layer contains a polyolefin resin. In the rubber layer, the mass ratio of the nitrile rubber to the ethylene propylene diene rubber is greater than 45/55.

Description

[Technical Field]

[0001] The present invention relates to an apron band for spinning that is used to draft fibers or fiber bundles in various steps of spinning.

[Background Art]

[0002] For spinning application, a drafting apparatus for drafting fibers or fiber bundles is used. FIG. 4 is a side view schematically showing a drafting apparatus. The drafting apparatus includes a pair of first rollers 110a and 110b that are provided at the center and on each of which an apron band is provided, and a pair of second rollers 111a and 111b and a pair of third rollers 112a and 112b that are provided on opposite sides of the pair of first rollers 110a and 110b such that the pair of first rollers 110a and 110b are located between the pair of second rollers 111a and 111b and the pair of third rollers 112a and 112b. Apron bands 101a and 101b are respectively provided on the first rollers 110a and 110b so as to be in contact with portions of the circumferential surfaces of the first rollers 110a and 110b. Tensor bars 104a and 104b are disposed such that predetermined regions of the outer circumferential surfaces of the apron bands 101a and 101b are in contact with a fiber bundle F. The apron band 101a is looped around the first roller 110a and the tensor bar 104a. Likewise, the apron band 101b is looped around the first roller 110b and the tensor bar 104b as well. The fiber bundle F is fed from the second rollers 111a and 111b toward the third rollers 112a and 112b and is drafted while passing through these rollers.

[0003] Apron bands are required to have a certain level of flexibility because they are brought into contact with fiber bundles or fibers. For this reason, conventionally, rubber apron bands are used (Patent Literature 1). The inner side of a rubber apron band is required to have slidability along a tensor bar. Accordingly, in general, the surface of a rubber apron band is acid treated. Also, a proposal is made to provide a smoothing cover layer having a low friction coefficient that is attached to the inner side of an apron band with the use of an adhesive (Patent Literature 2).

[Citation List]

[Patent Literature]

[0004] [PTL 1] Laid-Open Patent Publication No. H10-102328 [PTL 2] Examined Utility Model Application Publication No. S61-11243

[Summary of Invention]

[Technical Problem]

[0005] However, the apron bands disclosed in Patent Literatures 1 and 2 are less durable.

[Solution to Problem]

[0006] One aspect of the present invention relates to an apron band for spinning including: a rubber layer; and a resin layer that is attached to the rubber layer, wherein the rubber layer contains a nitrile rubber and an ethylene propylene diene rubber, the resin layer contains a polyolefin resin, and a mass ratio of the nitrile rubber to the ethylene propylene diene rubber is greater than 45/55.

[Advantageous Effects of Invention]

[0007] According to the present invention, it is possible to provide an apron band for spinning that is excellent in durability.

[Brief Description of Drawings]

[0008] 

FIG. 1 is a schematic cross-sectional view of an apron band according to one embodiment of the present invention, taken along a thickness direction of the apron band.

FIG. 2 is a schematic cross-sectional view of an apron band according to another embodiment of the present invention, taken along a thickness direction of the apron band.

FIG. 3 is a schematic cross-sectional view of an apron band according to another embodiment of the present invention, taken along a thickness direction of the apron band.

FIG. 4 is a side view schematically showing an ordinary drafting apparatus that includes apron bands.

[Description of Embodiment]

[Apron Band for Spinning]

[0009] An apron band for spinning according to one aspect of the present invention includes a rubber layer and a resin layer that is attached to the rubber layer. The rubber layer contains a nitrile rubber and an ethylene propylene diene rubber (EPDM). The resin layer contains a polyolefin resin. The mass ratio of the nitrile rubber to the EPDM is greater than 45/55. As used herein, the expression "the rubber layer and the resin layer are attached" means that the apron band has an adhesion interface between the rubber layer and the resin layer. To be specific, the expression means that the apron band and the rubber layer are joined or bonded to each other.

[0010]  Because the rubber layer contains a nitrile rubber, it is possible to ensure a high level of flexibility and fiber retention. In addition, with a combination of the EPDM contained in the rubber layer and the resin layer containing a polyolefin resin, it is also possible to ensure a high level of affinity between the rubber layer and the resin layer. Accordingly, the rubber layer and the resin layer can be attached even without the use of an adhesive, and a high level of adhesion can be ensured. Also, because the mass ratio of the nitrile rubber to the EPDM is greater than 45/55, it is possible to obtain a high level of wear resistance, and the resin layer has a higher strength and chemical resistance than rubber. Accordingly, the durability of the apron band can be improved. It is also possible to obtain a high level of dimensional stability. Furthermore, even if the thickness of the apron band is reduced, the strength of the apron band is likely to be ensured. When the resin layer is disposed on the inner side of the apron band, a high level of slidability along a tensor bar is likely to be obtained, and it is therefore unnecessary to perform an acid treatment or the like that has been conventionally performed. Because an adhesive application step and an acid treatment step can be omitted, this configuration is advantageous in terms of costs.

[0011] Because the apron band according to the present invention includes a resin layer that is attached to the rubber layer, it is possible to ensure strength and dimensional stability. Accordingly, there is no other particular limitation on the layer structure. The apron band may have a double layer structure composed of a rubber layer and a resin layer, or may have a multilayer structure composed of more than two layers.

[0012] The rubber layer has excellent fiber retention, and it is therefore preferable that the rubber layer is disposed on the fiber contact side. FIG. 1 is a schematic cross-sectional view of an example of an apron band having a double layer structure, taken along a thickness direction of the apron band. To describe it more specifically, an apron band 1 includes a first surface A that is on the fiber contact side and a second surface B that is on the opposite side of the first surface A. The first surface A is a surface of a rubber layer 2, and the second surface B is a surface of a resin layer 3. With the apron band configured as described above, fibers can be easily retained by the rubber layer on the first surface side, and a high level of slidability along a tensor bar can be obtained on the second surface side.

[0013] However, the apron band is not limited to the configuration in the example shown in FIG. 1, and may be configured by disposing, for example, the resin layer on the first surface side and the rubber layer on the second surface side. It is also possible to configure the apron band by disposing a resin layer between two rubber layers such that the resin layer is attached to the two rubber layers. Alternatively, the apron band may be configured to have a multilayer structure composed of four layers or more by alternatively stacking resin layers and rubber layers. FIG. 2 is a schematic cross-sectional view of an example of an apron band having a triple layer structure, taken along a thickness direction of the apron band. An apron band 11 includes two rubber layers 2 and a resin layer 3 that is interposed between the two rubber layers 2 and is attached to the rubber layers 2. A first surface A and a second surface B are surfaces of the rubber layers 2, respectively. With the apron band as configured above, at least the second surface may be acid treated so as to impart slidability along a tensor bar to the rubber layer.

[0014] The type and formulation of resin that constitutes the resin layer may be selected by taking into consideration compatibility with the nitrile rubber and the EPDM. In a preferred embodiment, the resin layer contains polyethylene. In this case, a high level of affinity between the rubber layer and the resin layer is likely to be ensured by a combination of the EPDM and the resin layer. Accordingly, the rubber layer and the resin layer can be attached with a high adhesion strength, and the strength of the apron band can be further enhanced.

[0015] Because the apron band includes a resin layer, the apron band can have a high level of strength. However, from the viewpoint of further enhancing the strength, the apron band may further include an internally embedded core thread. The core thread may be embedded in either the rubber layer or the resin layer, or may be embedded between the rubber layer and the resin layer while being in contact with these two layers. FIG. 3 is a schematic cross-sectional view of an example of an apron band in which a core thread is embedded in a rubber layer, taken along a thickness direction of the apron band. In the example shown in the diagram, an apron band 21 includes a rubber layer 22 that is provided on a first surface A side and a resin layer 3 that is attached to the rubber layer 22 and is provided on a second surface B side. In the rubber layer 22, a plurality of core threads 24 are embedded.

[0016] Hereinafter, the configuration of the apron band will be described more specifically.

(Rubber Layer)

[0017] The rubber layer contains a nitrile rubber and an EPDM.

[0018] Examples of the nitrile rubber include acrylonitrile butadiene rubber (NBR), acrylonitrile butadiene isoprene rubber (NBIR) in which some of the butadiene units are substituted by isoprene units, and hydrogenated products thereof (for example, hydrogenated NBR). Also, the nitrile rubber may be modified by introducing a third monomer unit (a monomer unit other than acrylonitrile and butadiene) where necessary. The rubber layer may contain one of the nitrile rubbers listed above, or may contain two or more.

[0019] The ratio of acrylonitrile (AN) unit (the amount of bound AN) in the nitrile rubber is, for example, 18 to 50 mass%, and preferably 30 to 45 mass%. When the ratio of AN unit is within the above range, it is possible to obtain a high level of oil resistance and wear resistance.

[0020] The proportion of the nitrile rubber in the rubber component contained in the rubber layer is preferably greater than 45 mass%. From the viewpoint of further enhancing the wear resistance, the proportion of the nitrile rubber is more preferably 50 mass% or more, and even more preferably greater than 60 mass% (in particular, 65 mass% or more).

[0021] The EPDM is a rubber obtained by introducing a diene component into an ethylene propylene rubber. Examples of the diene component include ethylidene norbornene (ENB), 1,4-hexadiene, and dicyclopentadiene. EPDM may contain one or more diene components.

[0022]  The amount of the diene component (a unit derived from the diene component) in the EPDM is, for example, 1 to 15 mass%, and preferably 4 to 10 mass%. When the amount of the diene component is within the above range, it is possible to easily construct a co-crosslinking structure with the nitrile rubber.

[0023] In the rubber layer (the rubber component contained in the rubber layer), the mass ratio of the nitrile rubber to the EPDM (or in other words, the mass ratio between the nitrile rubber and the EPDM) is greater than 45/55. If the mass ratio of the nitrile rubber to the EPDM is less than or equal to 45/55, wear resistance is lowered, and a practically sufficient level of durability cannot be obtained. From the viewpoint of obtaining a high level of abrasion resistance while ensuring the flexibility of the rubber layer, the mass ratio of the nitrile rubber to the EPDM is preferably 50/50 or greater, and more preferably greater than 60/40 (in particular, 65/35 or greater). The mass ratio of the nitrile rubber to the EPDM is, for example, 99/1 or less, and preferably 95/5 or less, or 85/15 or less. From the viewpoint of obtaining a high level of adhesion, the mass ratio of the nitrile rubber to the EPDM is preferably less than 85/15, and more preferably 80/20 or less (in particular, 75/25 or less). The lower limit values and the upper limit values mentioned above can be combined in any way. The mass ratio of the nitrile rubber to the EPDM is, for example, greater than 45/55 and less than or equal to 99/1, greater than 45/55 and less than or equal to 95/5, greater than 45/55 and less than 85/15, or a range of 50/50 to 75/25.

[0024] The rubber component contained in the rubber layer may contain a rubber (third rubber) other than the nitrile rubber (first rubber) and the EPDM (second rubber). Examples of the third rubber include olefin rubbers other than the EPDM (such as ethylene propylene rubber), styrene butadiene rubber (SBR), and fluorine rubber. Examples of the fluorine rubber include vinylidene fluoride rubber (FKM), tetrafluoroethylene-propylene rubber (FEPM), and tetrafluoroethylene-perfluoro vinyl ether rubber (FFKM). These third rubbers may be used singly or in a combination of two or more. The total proportion of the nitrile rubber and the EPDM in the rubber component contained in the rubber layer is preferably 70 mass% or more, and more preferably 85 mass% or more.

[0025] The rubber layer may contain additives that are normally used in apron bands. Examples of the additives include a filler, a vulcanizing agent, a vulcanizing accelerating agent, a vulcanization accelerator auxiliary, a processing auxiliary, and a plasticizing agent. The rubber component for constituting the rubber layer is preferably vulcanized by using a vulcanizing agent (and optionally a vulcanizing accelerating agent).

(Resin Layer)

[0026] The resin layer contains a polyolefin resin. The resin layer containing a polyolefin resin is compatible with the EPDM, and affinity between the rubber layer and the resin layer is likely to be ensured. Examples of the polyolefin resin include polyethylene, polypropylene, and ethylenepropylene copolymers. These polyolefin resins may be used singly or in a combination of two or more.

[0027] As the polyolefin resin, it is preferable to use an ultrahigh molecular weight polyethylene having a molecular weight of 1,000,000 to 12,000,000. When such an ultrahigh molecular weight polyethylene is used as the polyolefin resin, a high level of slidability is likely to be obtained, and a high level of durability is obtained.

[0028] The resin layer may contain a resin other than the polyolefin resin, additives, and the like. The ratio of the polyolefin resin in the resin layer is, for example, 50 mass% or more, and preferably 75 mass% or more.

[0029] The thickness ratio between the rubber layer and the resin layer can be selected from a range of, for example, 99:1 to 50:50. When the thickness ratio is within the above range, an apron band having an excellent balance of strength and flexibility is likely to be obtained.

(Core Thread)

[0030] As the core thread, any core thread used in apron bands can be used without any limitation. The material and average fiber diameter of the core thread are determined as appropriate according to the desired characteristics of the apron band. Examples of the material of the core thread include: natural fibers such as cotton, hemp, silk; and synthetic fibers such as polyamide fibers and polyester fibers.

[0031] Inside the apron band, a plurality of core threads may be randomly disposed or orderly arranged. For example, a plurality of core threads may be orderly arranged, for example, such that the lengthwise direction of the core threads extends along the width direction of the cylindrical apron band or extends along the circumferential direction of the cylindrical apron band. From the viewpoint of enhancing the strength, the plurality of core threads are preferably orderly arranged such that the lengthwise direction of the core threads extends along the circumferential direction. As used herein, the expression "the plurality of core threads are orderly arranged such that the lengthwise direction of the core threads extends along the width direction or the circumferential direction" encompasses not only the case where the lengthwise direction of the core threads is parallel to the width direction or the circumferential direction, but also the case where the lengthwise direction of the core threads extends at an angle with respect to the width direction or the circumferential direction. The angle θ formed by an average fiber length direction and the circumferential direction satisfies 0°<θ<90°, and may satisfy 0°<θ<60°. As used herein, the term "average fiber length direction" refers to the direction of a straight line connecting two arbitrary points on one arbitrarily selected fiber.

(Others)

[0032] The apron band has a thickness of, for example, 0.1 to 8.0 mm, and preferably a thickness of 0.5 to 3.0 mm.

[0033] The apron band can be produced by, for example, winding a sheet composed of a resin layer around the circumferential surface of a cylindrical core member (iron core or the like), thermally melting the overlapping portion, covering the surface of the cylindrical resin layer with a rubber layer, and pressing the whole body with the application of heat. Depending on the layer structure of the apron band, the apron band may also be produced by covering the circumferential surface of a cylindrical core member with a rubber layer, winding a sheet composed of a resin layer around the rubber layer on the circumferential surface of the cylindrical core member, and pressing the whole body with the application of heat. The heating temperature and the pressure used to press the whole body can be determined as appropriate according to the composition of the rubber layer and the resin layer. According to the present embodiment, it is possible to obtain an apron band in which a rubber layer and a resin layer are attached without forming an adhesive layer between the rubber layer and the resin layer. The rubber component for constituting the rubber layer is preferably vulcanized by using a vulcanizing agent and a vulcanizing accelerating agent at an appropriate stage.

[0034] In the case where a core thread is embedded between the rubber layer and the resin layer, the core thread may be disposed between the rubber layer and the sheet composed of the resin layer, which is then pressed. In the case where the core thread is embedded in the rubber layer or the resin layer, the core thread is embedded when the rubber layer or the resin layer is formed. The core thread can be embedded by using a known method.

[0035] Where necessary, the surface of the rubber layer or the resin layer of the apron band that has been formed may be acid treated. The acid treatment can be performed by using, for example, hydrochloric acid, hypochlorous acid, and the like.

[Examples]

[0036] Hereinafter, the present invention will be described specifically by way of examples and comparative examples. However, it is to be noted that the present invention is not limited to the examples given below.

Example 1

[0037] NBR (Nipol 1042S available from Zeon Corporation, with an AN ratio of 33.5 mass%) and EPDM (EP33 available from JSR Corporation, with an ENB content of 8.1 mass% and an ethylene content of 52 mass%) were mixed in a mass ratio of 50:50 and kneaded by using a kneader. With respect to 100 parts by mass of the obtained mixture (rubber component), 30 parts by mass of vinyl chloride resin (ZEST P-21 available from Shin Dai-Ichi Vinyl Corporation) and 15 parts by mass of silica (ULTRASIL VN3 available from Evonik Japan, Co., Ltd.) as fillers, 1.5 parts by mass of finely powdered sulfur (sulfur fine powder 200 mesh available from Tsurumi Chemical Industry, Co., Ltd.) as a vulcanizing agent, 2 parts by mass of N-oxydiethylene-2-benzothiazolyl sulfenamide (NOCCELER MSA-G available from Ouchi Shinko Chemical Industrial Co., Ltd.) as a vulcanizing accelerating agent, 3 parts by mass of zinc oxide (JIS first grade zinc oxide available from Sakai Chemical Industry, Co., Ltd.) as a vulcanization accelerator auxiliary, 10 parts by mass of dioctyl phthalate (DOP available from J-PLUS Co., Ltd.) as a plasticizing agent, and 1 part by mass of stearic acid (LUNAC S-50V available from Kao Corporation) as a processing auxiliary were added, and the mixture was kneaded by using a kneader. The kneaded material was fed into an extrusion molding machine, and an unvulcanized tube (with a thickness of 1.5 mm) was produced.

[0038] A 50 µm thick film made of polyethylene (ultrapolymer UHMWPE available from Yodogawa Hu-Tech Co., Ltd., with a melting point of 136°C) was wound around a vulcanization iron core, and the overlapping portion was thermally melted. In this way, a resin layer was formed.

[0039] The unvulcanized tube was fitted to the vulcanization iron core around which the resin layer was formed, a wrapping film was tightly wrapped around the circumferential surface of the unvulcanized tube. Then, in this state, vulcanization was performed at 160°C for 60 minutes in a steam vulcanization chamber so as to vulcanize the tube.

[0040] The wrapping film was stripped off, and the vulcanization iron core was removed. Then, the outer circumference of the vulcanized tube was adjusted to a predetermined thickness by using a cylindrical grinder and cut into a predetermined length. A cylindrical apron band (with a thickness of 1.0 mm) was thereby produced in which a rubber layer (vulcanized tube) and a resin layer (polyethylene film) were attached to each other.

Examples 2 to 10 and Comparative Examples 1 to 4

[0041] Apron bands were produced in the same manner as in Example 1 except that the NBR and the EPDM were mixed and kneaded in the mass ratio shown in Table 1 so as to obtain a rubber component.

Comparative Example 5

[0042] Two unvulcanized tubes were produced in the same manner as in Example 1, except that only the NBR was used as the rubber component without using the EPDM.

[0043] An unvulcanized tube (for forming an inner layer rubber) was fitted to a vulcanization iron core, and a thread (No. 30 count cotton thread) immersed in an organic solvent was spirally wound around the circumferential surface of the unvulcanized tube. The other unvulcanized tube (for forming an outer layer rubber) was further fitted to the circumferential surface of the unvulcanized tube on the vulcanization iron core, and a wrapping film was tightly wrapped around the circumferential surface of the unvulcanized tube. Then, in this state, vulcanization was performed at 160°C for 60 minutes in a steam vulcanization chamber so as to vulcanize both the tube for forming an inner layer rubber and the tube for forming an outer layer rubber.

[0044] The wrapping film was stripped off, and the vulcanization iron core was removed. In this way, a vulcanized tube was obtained. The vulcanized tube was subjected to a surface treatment by immersing the vulcanized tube in an aqueous solution containing hydrochloric acid and hypochlorous acid. After the surface treatment, the outer circumference of the tube was adjusted to a predetermined thickness by using a cylindrical grinder and cut into a predetermined length. The obtained tube was again subjected to a surface treatment by immersing the vulcanized tube in the aqueous solution described above. In this way, a cylindrical apron band (with a thickness of 1.0 mm) was produced in which the core thread was embedded.

[0045] The apron bands obtained in the examples and comparative examples were subjected to the following tests.

(i) Adhesion Test (Forced Separation Test)

[0046] Strip-shaped test samples (each having a length of 7 mm, a width of 50 mm and a thickness of 1 mm) were produced from the apron bands obtained in Examples 1 to 10 and Comparative Examples 1 to 4, ten pieces for each example/comparative example.

[0047] A tensile stress was gradually applied to each test piece, and evaluation was made as to which occurred earlier: separation between the resin layer and the rubber layer, or rupture of the rubber layer, based on the following criteria A to C.

[0048] Rating A: Rupture of the rubber layer occurred earlier than separation between the films in 90% or more of the test samples.

[0049] Rating B: Separation between the films and rupture of the rubber layer occurred randomly and unable to obtain a stable result as to which occurred earlier: separation between the resin layer and the rubber layer, or rupture of the rubber layer (or in other words, an intermediate rating between A and C).

[0050] Rating C: Separation between the films occurred earlier than rupture of the rubber layer in 90% or more of the test samples.

(ii) Wear Resistance Test

[0051] Test pieces were produced by using the kneaded materials obtained in Examples 1 to 10 and Comparative Examples 1 to 4, and wear resistance evaluation was performed by using a wear testing apparatus conforming to the JIS standard K6264 1993. Each test piece was subjected to 1000 rotations as a preliminary operation. After that, the initial mass (m₀) was measured. The test piece was subjected to 3660 rotations as the main test, and thereafter the mass (m₁) of the test piece was measured. Then, the rate of change in mass (mass%) was obtained from the following equation, and evaluation was made based on the following four criteria A to D.

[0052] Rating A: the rate of change in mass was 1 mass% or more and less than 2 mass%.

[0053] Rating B: the rate of change in mass was 2 mass% or more and less than 3 mass%.

[0054] Rating C: the rate of change in mass was 3 mass% or more and less than 4 mass%.

[0055] Rating D: the rate of change in mass was 4 mass% or more.

(iii) Measurement of Friction Coefficient

[0056] Test samples (each having a length of 100 mm, a width of 20 mm and a thickness of 1.0 mm) were produced from the apron bands obtained in Examples 5 and Comparative Example 5, and the friction coefficient of each test sample was measured. To be more specific, in Example 5, the friction coefficient of the surface of the resin layer was measured, and in Comparative Example 5, the friction coefficient of the surface of the inner layer rubber (in other words, the surface of the inner layer of the apron band) was measured.

[0057] As test conditions for obtaining friction coefficient, a surface performance measurement machine, HEIDON Tribo-gear Type 14, available from Shinto Scientific Co., Ltd. was used, and measurement was performed under the following conditions: a vertical load of 200 gf (≈ 1.96 N) and a measurement speed of 200 mm/min.

[Table 1]

		Comparative Example				Example										Comp. Ex.
		1	2	3	4	1	2	3	4	5	6	7	8	9	10	5
Rubber component (mass ratio)	NBR	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
	EPDM	70	65	60	55	50	45	40	35	30	25	20	15	10	5	-
Evaluation	Adhesion	A	A	A	A	A	A	A	A	A	A	B	C	C	C	-
	Wear resistance	D	D	D	D	C	C	C	B	B	B	B	B	A	A	-
	Friction coefficient	-	-	-	-	-	-	-	-	0.21	-	-	-	-	-	0.28

[0058] As shown in Table 1, ratings A to C are given to the examples in the wear resistance test, which indicates that the apron bands of the examples have a practically sufficient level of wear resistance. With any one of the ratings A to C given in the wear resistance test, it is regarded as being capable of withstanding the load when used as an apron band in textile machinery such as a spinning machine over the desired product life. On the other hand, in Comparative Examples 1 to 4, although the adhesion between the resin layer and the rubber layer is high, the rating D is given in the wear resistance test. With the rating D, damage caused by wear occurs early before the product life expires, which means it is not possible to obtain a practically sufficient level of durability. From the viewpoint of enhancing the adhesion between the resin layer and the rubber layer, the mass ratio of the nitrile rubber to the EPDM is preferably less than 85/15.

[0059] In Example 5, a low friction coefficient was obtained. When the apron band having a low friction coefficient is installed in textile machinery such as a spinning machine, the apron band will be smoothly rotated, and fibers can be smoothly conveyed. As a result, it is possible to expect an effect of improving the quality of the resulting yarn. In addition, the low friction coefficient obtained in Example 5 is derived from the resin layer itself, and thus damage caused by wear or the like during use is unlikely to occur. On the other hand, Comparative Example 5 exhibited a similar level of friction coefficient to that of Example 5, but this value is obtained due to a surface treatment layer obtained in the acid treatment during the production process, and the rubber inherently has a very high level of friction coefficient. Accordingly, when the apron band obtained in Comparative Example 5 is actually installed in textile machinery and rotated, the apron band will be abraded to increase the friction coefficient, and the apron band will not be smoothly rotated, which impairs the quality of the yarn.

[Industrial Applicability]

[0060] The apron band for spinning according to the embodiment of the present invention is suitable for use in a drafting apparatus that drafts fibers or fiber bundles in various steps of spinning such as gilling, bobbiner, drawing, roving, and spinning.

[Reference Signs List]

[0061] 

1, 11, 21

Apron Band for Spinning

2, 22

Rubber Layer

3

Resin Layer

24

Core Thread

A

First Surface

B

Second Surface

101a, 101b

Apron Band

104a, 104b

Tensor Bar

110a, 110b

First Roller

111a, 111b

Second Roller

112a, 112b

Third Roller

F

Fiber Bundle

Claims

1. An apron band for spinning comprising:

a rubber layer; and

a resin layer that is attached to the rubber layer,

wherein the rubber layer contains a nitrile rubber and an ethylene propylene diene rubber,

the resin layer contains a polyolefin resin, and

a mass ratio of the nitrile rubber to the ethylene propylene diene rubber is greater than 45/55.

2. The apron band for spinning according to claim 1,
wherein the apron band for spinning includes a first surface that is provided on a fiber contacting side and a second surface that is provided on a side opposite to the first surface,
the first surface is a surface of the rubber layer, and
the second surface is a surface of the resin layer.

3. The apron band for spinning according to claim 1 or 2,
wherein in the rubber layer, the mass ratio of the nitrile rubber to the ethylene propylene diene rubber is greater than 45/55 and less than 85/15.

4. The apron band for spinning according to any one of claims 1 to 3,
wherein the polyolefin resin includes polyethylene.

5. The apron band for spinning according to any one of claims 1 to 4, further comprising an internally embedded core thread.

Drawing