JP6887804B2 - Apron band for spinning - Google Patents

Description

The present invention relates to a spinning apron band used for stretching fibers and fiber bundles in various spinning processes.

In spinning applications, draft devices that stretch fibers and fiber bundles are used. FIG. 4 is a side view schematically showing the draft device. The draft device includes a pair of central first rollers 110a and 110b to which an apron band is attached, and a pair of second rollers 111a and 111b and a pair of first rollers arranged so as to sandwich the pair of first rollers 110a and 110b. It includes three rollers 112a and 112b. Apron bands 101a and 101b are attached so as to come into contact with a part of the peripheral surfaces of the first rollers 110a and 110b, respectively. The ten servers 104a and 104b are arranged so that predetermined regions on the outer peripheral surfaces of the apron bands 101a and 101b come into contact with the fiber bundle F, respectively. The apron band 101a is bridged between the first roller 110a and the ten server 104a. Similarly, the apron band 101b is also bridged between the first roller 110b and the ten server 104b. The fiber bundle F is sent from the second rollers 111a and 111b toward the third rollers 112a and 112b, and is stretched while passing through these rollers.

Since the apron band comes into contact with fiber bundles and fibers, a certain degree of flexibility is required. Therefore, conventionally, a rubber apron band has been used (Patent Document 1). Since the inside of the apron band is required to have slidability with respect to the ten server, the surface of the rubber apron band is generally acid-treated. It has also been proposed to adhere a lubricating coating layer having a low coefficient of friction to the inside of the apron band with an adhesive (Patent Document 2).

Japanese Unexamined Patent Publication No. 10-102328 Jikkensho 61-1243

However, the apron band of Patent Document 1 and Patent Document 2 has low durability.

One aspect of the present invention includes a rubber layer and a resin layer bonded to the rubber layer.
The rubber layer contains nitrile rubber and ethylene propylene diene rubber.
The resin layer contains a polyolefin resin and contains
The present invention relates to a spinning apron band in which the mass ratio of the nitrile rubber to the ethylene propylene diene rubber is larger than 45:55.

According to the present invention, it is possible to provide a spinning apron band having excellent durability.

It is sectional drawing in the thickness direction of the apron band which concerns on one Embodiment of this invention. It is sectional drawing in the thickness direction of the apron band which concerns on other embodiment of this invention. It is sectional drawing in the thickness direction of the apron band which concerns on another embodiment of this invention. It is a side view which shows typically the general draft device provided with an apron band.

[Apron band for spinning]
The spinning apron band according to one aspect of the present invention includes a rubber layer and a resin layer bonded to the rubber layer. The rubber layer contains nitrile rubber and ethylene propylene diene rubber (EPDM). The resin layer contains a polyolefin-based resin. The mass ratio of nitrile rubber to EPDM is greater than 45:55. The fact that the rubber layer and the resin layer are bonded means that the apron band has an adhesive interface between the rubber layer and the resin layer.

Since the rubber layer contains nitrile rubber, high flexibility and fiber retention can be ensured. Further, by combining EPDM contained in the rubber layer and the resin layer containing the polyolefin-based resin, a high affinity between the rubber layer and the resin layer can be ensured. Therefore, the rubber layer and the resin layer can be bonded without using an adhesive, and high bondability can be ensured. Further, when the mass ratio of nitrile rubber and EPDM is larger than 45:55, high wear resistance can be obtained, and the resin layer is superior in strength and chemical resistance as compared with rubber. Therefore, the durability of the apron band can be improved. In addition, high dimensional stability can be obtained. Further, even if the thickness of the apron band is reduced, it is easy to secure the strength of the apron band. When the resin layer is arranged inside the apron band, high slidability with respect to the ten server can be easily obtained, so that the conventional acid treatment or the like becomes unnecessary. Since the steps of applying the adhesive and the acid treatment step can be reduced, it is also advantageous in terms of cost.

In the apron band according to the present invention, the strength and dimensional stability can be ensured by providing the resin layer bonded to the rubber layer, so that other layer configurations are not particularly limited. The apron band may have a two-layer structure of a rubber layer and a resin layer, or may have a multi-layer structure of more than that.

Since the rubber layer has excellent fiber retention, it is preferable that the rubber layer is arranged on the side in contact with the fiber. FIG. 1 is a schematic cross-sectional view in the thickness direction showing an example of an apron band having a two-layer structure. More specifically, the apron band 1 includes a first surface A on the side in contact with the fiber and a second surface B on the side opposite to the first surface A, and the first surface A is a rubber layer. 2 is the surface, and the second surface B is the surface of the resin layer 3. In such an apron band, the rubber layer easily holds the fibers on the first surface side, and the resin layer on the second surface side provides high slidability with respect to the ten server.

However, the apron band is not limited to the example of FIG. 1, and for example, a resin layer may be arranged on the first surface side and a rubber layer may be arranged on the second surface side. Further, in the apron band, a resin layer bonded to both rubber layers may be arranged between the two rubber layers, and the resin layers and the rubber layers are alternately laminated to form a multi-layer structure of four or more layers. You may be doing it. FIG. 2 is a schematic cross-sectional view in the thickness direction showing an example of an apron band having a three-layer structure. The apron band 11 includes two rubber layers 2 and a resin layer 3 interposed between them and bonded to both rubber layers 2. The first surface A and the second surface B are the surfaces of the rubber layer 2, respectively. In such an apron band, at least the second surface may be acid-treated to impart slidability to the ten server to the rubber layer.

The type and composition of the resin constituting the resin layer may be selected in consideration of compatibility with nitrile rubber and EPDM. In a preferred embodiment, the resin layer comprises polyethylene. In this case, it is easy to secure a high affinity between the rubber layer and the resin layer by combining the EPDM and the resin layer. Therefore, the rubber layer and the resin layer can be joined with high strength, and the strength of the apron band can be further increased.

Since the apron band includes a resin layer, high strength can be obtained, but from the viewpoint of further increasing the strength, a core thread embedded inside may be further included. The core thread may be embedded in either the rubber layer or the resin layer, or may be embedded between the two layers in contact with both layers. FIG. 3 is a schematic cross-sectional view of the apron band in the thickness direction, showing an example in which the core thread is embedded in the rubber layer. In the illustrated example, the apron band 21 includes a rubber layer 22 arranged on the first surface A side and a resin layer 3 joined to the rubber layer 22 and arranged on the second surface B side. A plurality of core threads 24 are embedded in the rubber layer 22.

Hereinafter, the configuration of the apron band will be described more specifically.
(Rubber layer)
The rubber layer contains nitrile rubber and EPDM.
Examples of the nitrile rubber include acrylonitrile butadiene rubber (NBR), acrylonitrile butadiene isoprene rubber (NBIR) in which a part of the butadiene unit is replaced with an isoprene unit, and hydrides thereof (for example, hydride NBR). Further, the nitrile rubber may be modified by introducing a third monomer unit (monomer unit other than acrylonitrile and butadiene), if necessary. The rubber layer may contain one of these nitrile rubbers, or may contain two or more of them.

The ratio (bonded AN amount) of the acrylonitrile (AN) unit in the nitrile rubber is, for example, 18 to 50% by mass, and preferably 30 to 45% by mass. When the ratio of AN units is in such a range, high oil resistance and wear resistance can be obtained.

The proportion of nitrile rubber in the rubber component contained in the rubber layer is preferably more than 45% by mass, more preferably 50% by mass or more, and more than 60% by mass (particularly) from the viewpoint of further enhancing wear resistance. , 65% by mass or more) is more preferable.

EPDM is a rubber obtained by introducing a diene component into ethylene-propylene rubber. Examples of the diene component include ethylidene norbornene (ENB), 1,4-hexadiene, dicyclopentadiene and the like. One or more diene components may be introduced into EPDM.

The amount of the diene component (unit derived from the diene component) in EPDM is, for example, 1 to 15% by mass, preferably 4 to 10% by mass. When the amount of the diene component is in such a range, a co-crosslinked structure with the nitrile rubber can be easily constructed.

In the rubber layer (rubber component in the rubber layer), the mass ratio of nitrile rubber to EPDM (that is, the mass ratio of nitrile rubber to EPDM) is larger than 45:55. When the mass ratio of nitrile rubber and EPDM is 45:55 or less, the wear resistance becomes low and sufficient durability for practical use cannot be obtained. From the viewpoint of ensuring the flexibility of the rubber layer and obtaining high abrasion resistance, the mass ratio of nitrile rubber and EPDM is preferably 50:50 or more, and is larger than 60:40 (particularly, in particular). 65:35 or higher) is more preferable. The mass ratio of nitrile rubber to EPDM is, for example, 99: 1 or less, preferably 95: 5 or less, or 85:15 or less. From the viewpoint of obtaining high bondability, the mass ratio of nitrile rubber and EPDM is preferably smaller than 85:15, and more preferably 80:20 or less (particularly 75:25 or less). These lower limit values and upper limit values can be arbitrarily combined. The mass ratio of nitrile rubber to EPDM is, for example, greater than 45:55 and less than 99: 1, greater than 45:55 and less than 95: 5, greater than 45:55 and less than 85:15, or 50:50 to 75. : 25 may be used.

The rubber component of the rubber layer may include rubber (third rubber) other than nitrile rubber (first rubber) and EPDM (second rubber). Examples of the third rubber include olefin rubbers (ethylene propylene rubber and the like) other than EPDM, styrene butadiene rubber (SBR), fluororubber and the like. Examples of the fluororubber include vinylidene fluoride rubber (FKM), tetrafluoroethylene-propylene rubber (FEPM), tetrafluoroethylene-purple olovinyl ether rubber (FFKM), and the like. The third rubber can be used alone or in combination of two or more. The total ratio of nitrile rubber and EPDM in the rubber component of the rubber layer is preferably 70% by mass or more, and more preferably 85% by mass or more.

The rubber layer may contain additives commonly used in apron bands. Examples of the additive include a filler, a vulcanizing agent, a vulcanization accelerator, a vulcanization accelerating aid, a processing aid, a plasticizer, and the like. The rubber component constituting the rubber layer is preferably vulcanized with a vulcanizing agent (and, if necessary, a vulcanization accelerator).

(Resin layer)
The resin layer contains a polyolefin-based resin. The resin layer containing the polyolefin-based resin is easily compatible with EPDM, and the affinity between the rubber layer and the resin layer is also easy to be secured. Examples of the polyolefin-based resin include polyethylene, polypropylene, and an ethylene-propylene copolymer. One type of polyolefin resin can be used alone or in combination of two or more types.

As the polyolefin-based resin, ultra-high molecular weight polyethylene having a molecular weight of 1 million to 12 million is suitable. In the case of ultra-high molecular weight polyethylene, high slidability can be easily obtained and high durability can be obtained.

The resin layer may contain a resin other than the polyolefin-based resin, additives, and the like. The ratio of the polyolefin-based resin to the resin layer is, for example, 50% by mass or more, and preferably 75% by mass or more.

The thickness ratio of the rubber layer to the resin layer can be selected from, for example, the range of 99: 1 to 50:50. When the thickness ratio is in such a range, it is easy to obtain an apron band having an excellent balance between strength and flexibility.

(Core thread)
As the core thread, the core thread used for the apron band is used without particular limitation. The material of the core yarn and the average fiber diameter are appropriately determined according to the characteristics of the desired apron band and the like. Examples of the core material include natural fibers such as cotton, hemp and silk, and synthetic fibers such as polyamide fibers and polyester fibers.

The plurality of core threads may be randomly arranged or arranged inside the apron band. For example, the plurality of core threads may be arranged so that the length direction of the core threads is along the width direction of the tubular apron band, or may be arranged so as to be along the circumferential direction. From the viewpoint of increasing the strength, it is preferable to arrange them along the circumferential direction. The case of along the width direction or along the circumferential direction includes not only the case of being parallel to the width direction and the circumferential direction but also the case of forming a certain angle. The angle θ formed by the average length direction and the circumferential direction of the fibers satisfies 0 ° <θ <90 °, and may be 0 ° <θ ≦ 60 °. The average length direction of the fibers is the direction of a straight line connecting any two points in one arbitrarily selected fiber.

(Other)
The thickness of the apron band is, for example, 0.1 to 8.0 mm, preferably 0.5 to 3.0 mm.

In the apron band, for example, a sheet made of a resin layer is wound around the peripheral surface of a tubular core material (iron core, etc.) to heat-weld the overlapping portion, and the surface of the tubular resin layer is covered with a rubber layer. It can be manufactured by crimping the whole under heating. Depending on the layer structure of the apron band, the peripheral surface of the tubular core material may be covered with a rubber layer, a sheet made of a resin layer may be wound around the apron band, and the entire surface may be crimped under heating. The heating temperature and the pressure at the time of crimping can be appropriately determined according to the composition of the rubber layer and the resin layer. In the present embodiment, it is possible to obtain an apron band in which the rubber layer and the resin layer are bonded without forming an adhesive layer between the rubber layer and the resin layer. The rubber component constituting the rubber layer is preferably vulcanized with a vulcanizing agent or a vulcanization accelerator at an appropriate stage.

When the core thread is embedded between the rubber layer and the resin layer, the core thread may be arranged between the rubber layer and the sheet and crimped. When 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. A known method can be adopted for embedding the core thread.

If necessary, the surface of the rubber layer or the resin layer of the formed apron band may be subjected to acid treatment. The acid treatment can be performed using, for example, hydrochloric acid, hypochlorous acid, or the like.

[Example]
Hereinafter, the present invention will be specifically described based on Examples and Comparative Examples, but the present invention is not limited to the following Examples.

Example 1
NBR (manufactured by Nippon Zeon Corporation, Nipol1042S, AN ratio: 33.5% by mass) and EPDM (manufactured by JSR Co., Ltd., EP33, ENB content: 8.1% by mass, ethylene content: 52% by mass) Was mixed at a ratio of 50:50 (mass ratio) and kneaded using a kneader. Vinyl chloride resin (manufactured by Shin-Daiichi PVC Co., Ltd., ZEST P-21) and silica (manufactured by Ebonic Japan Co., Ltd., ULTRASIL VN3) as fillers with respect to 100 parts by mass of the obtained mixture (rubber component). 30 parts by mass and 15 parts by mass, 1.5 parts by mass of fine powder sulfur (manufactured by Tsurumi Chemical Industry Co., Ltd., 200 mesh product) as a vulcanizing agent, and N-oxydiethylene-2-benzothiazoli as a vulcanization accelerator. Rusulfeneamide (manufactured by Ouchi Shinko Kagaku Kogyo Co., Ltd., Noxeller MSA-G) 2 parts by mass, zinc oxide (manufactured by Sakai Kagaku Kogyo Co., Ltd., zinc oxide 1 type) 3 parts by mass as a vulcanization accelerator, plastic 10 parts by mass of dioctylphthalate (DOP, manufactured by J-PLUS Co., Ltd.) as an agent and 1 part by mass of stearic acid (manufactured by Kao Co., Ltd., Lunac S-50V) as a processing aid were added and kneaded with a kneader. The kneaded product was filled in an extrusion molding machine to prepare an unvulcanized tube (thickness: 1.5 mm).

A film (thickness: 50 μm) made of polyethylene (Yodogawa Hu-Tech Co., Ltd., ultrapolymer (UHMWPE), melting point: 136 ° C.) is wound around a vulcanized iron core, and the overlapped portion is heat-sealed to form a resin layer. did.

An unvulcanized tube is fitted into a vulcanized iron core on which a resin layer is formed, and a wrapping film is wrapped around this peripheral surface and tightened, and then vulcanized at 160 ° C. for 60 minutes in a steam vulcanization can. And the tube was vulcanized.

The rubber layer (vulcanization tube) is formed by removing the wrapping film, decentering the vulcanized iron core, adjusting the outer circumference of the vulcanization tube to a predetermined thickness with a cylindrical polishing machine, and then cutting to a predetermined width. A tubular apron band (thickness: 1.0 mm) was prepared by joining the resin layer (polyethylene film) with the resin layer.

Examples 2 to 10 and Comparative Examples 1 to 4
An apron band was produced in the same manner as in Example 1 except that NBR and EPDM were mixed at the mass ratios shown in Table 1 and kneaded to obtain a rubber component.

Comparative Example 5
Only NBR was used as the rubber component without using EPDM. Except for this, two unvulcanized tubes were prepared in the same manner as in Example 1.
An unvulcanized tube (for inner layer rubber) was fitted into the vulcanized iron core, and a thread (cotton thread pattern No. 30) immersed in an organic solvent was spirally wound around the peripheral surface of the unvulcanized tube. .. The peripheral surface is further covered with the remaining unvulcanized tube (for outer layer rubber), and the peripheral surface is wrapped with a wrapping film and tightened, and then vulcanized at 160 ° C. for 60 minutes in a steam vulcanization can. Was performed, and both the inner layer rubber and outer layer rubber tubes were vulcanized.

A vulcanized tube was obtained by removing the wrapping film and decentering the vulcanized iron core. The vulcanization tube was surface-treated by immersing it 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 with a cylindrical polishing machine, and then cut to a predetermined width. The obtained tube was immersed in the above aqueous solution again to perform surface treatment. In this way, a tubular apron band (thickness: 1.0 mm) in which the core thread was embedded was produced.

The following tests were performed using the apron bands obtained in Examples and Comparative Examples.
(I) Adhesion test (forced peeling test) From the apron bands obtained in Examples 1 to 10 and Comparative Examples 1 to 4, strip-shaped test samples (length 7 mm × width 50 mm × thickness 1 mm) were prepared for each example. It was made one by one.
Tensile stress was applied to the test piece, and whether the resin layer and the rubber layer were peeled off first or the rubber layer was broken first was evaluated according to the criteria A to C below.
A: In 90% or more of the test samples, the rubber breaks before the film peels off.
B: The order of peeling of the film and breaking of the rubber varies, and it is not possible to obtain a stable result as to which one occurs first. (That is, it is an intermediate result between A and C.)
C: In the test sample of 90% or more , the film peels off before the rubber breaks.

(Ii) Abrasion resistance test A test piece was prepared using the kneaded products obtained in Examples 1 to 10 and Comparative Examples 1 to 4, and an abrasion resistance test device conforming to JIS K6264: 1993 was used. Was evaluated. The test piece is operated in a familiar operation for 1000 rotations, then the initial mass (m _{0 ) is measured, the mass (m 1} ) of the test piece after 3660 rotations of this test is measured, and the mass change rate (mass%) is calculated by the following formula. Was calculated and evaluated using the following four-level index from A to D.
Rate of change in mass (mass%) = (m _{0 −} m ₁ ) / m ₀ × 100
A: The mass change rate is 1% by mass or more and less than 2% by mass.
B: The mass change rate is 2% by mass or more and less than 3% by mass.
C: The mass change rate is 3% by mass or more and less than 4% by mass.
D: The mass change rate is 4% by mass or more.

(Iii) Measurement of Friction Coefficient A test sample (length 100 mm × width 20 mm × thickness 1.0 mm) of the apron band obtained in Example 5 and Comparative Example 5 was prepared, and the friction coefficient of the test sample was measured. More specifically, in Example 5, the friction coefficient of the surface on the resin layer side was measured, and in Comparative Example 5, the friction coefficient of the surface on the inner layer rubber side (that is, the surface on the inner layer side of the apron band) was measured.
As the test conditions for the abrasion coefficient, a surface surface measuring machine HEIDON Tribo-gear Type 14 manufactured by Shinto Kagaku Co., Ltd. was used, and the measurement was performed under the conditions of a vertical load of 200 gf (≈1.96 N) and a measurement speed of 200 mm / min.

As shown in Table 1, in the examples, the evaluation of wear resistance is A to C, and practically sufficient wear resistance is obtained. If the wear resistance is evaluated as A to C, it is judged that the wear resistance can withstand the load when used as an apron band in a textile machine such as a spinning frame during the desired product life. On the other hand, in Comparative Examples 1 to 4, although the adhesiveness between the resin layer and the rubber layer is high, the abrasion resistance is evaluated as D. In the D evaluation, wear occurs due to wear in a period shorter than the product life period, and practically sufficient durability cannot be obtained. From the viewpoint of enhancing the adhesiveness between the resin layer and the rubber layer, the mass ratio of the nitrile rubber and EPDM is preferably smaller than 85:15.

In Example 5, the coefficient of friction was reduced. If the value of the coefficient of friction is small, the rotational operation when attached to a textile machine such as a spinning machine becomes smooth, and the fibers can be conveyed smoothly, so that the effect of improving the quality of the finished yarn can be expected. Further, since the low coefficient of friction of Example 5 is a characteristic brought about by the resin layer itself, it hardly disappears due to wear during use or the like. On the other hand, the coefficient of friction of Comparative Example 5 is also a value at the same level as that of Example 5, but this value is obtained by the surface treatment layer obtained by the acid treatment during the manufacturing process, and is the original friction of rubber. The coefficient is very high. Therefore, when it is actually attached to a textile machine and operated, it is worn away and the coefficient of friction increases, and the operation of the apron band becomes unsmooth, which causes deterioration of yarn quality.

The spinning apron band according to the embodiment of the present invention is suitable for use in a draft device for stretching fibers and fiber bundles in various spinning processes such as gil, bobina, kneading, roving, and spinning. There is.

1,11,21: Spinning apron band, 2,22: rubber layer, 3: resin layer, 24: core yarn, A: first surface, B: second surface, 101a, 101b: apron band, 104a, 104b : Ten server, 110a, 110b: 1st roller, 111a, 111b: 2nd roller, 112a, 112b: 3rd roller, F: Fiber bundle

Claims (4)

And the rubber layer, the rubber resin layer bonded to the layer and the free Mutotomoni, a first surface on the side in contact with the fibers, from the first surface and a second surface opposite,
The first surface is the surface of the rubber layer.
The second surface is the surface of the resin layer.
The rubber layer contains nitrile rubber and ethylene propylene diene rubber.
The proportion of the nitrile rubber in the rubber component contained in the rubber layer is more than 45% by mass.
The resin layer contains a polyolefin resin and contains
The ratio of the polyolefin-based resin to the resin layer is 50% by mass or more, and is
An apron band for spinning in which the mass ratio of the nitrile rubber to the ethylene propylene diene rubber is larger than 45:55. The apron band for spinning according to claim 1, wherein in the rubber layer, the mass ratio of the nitrile rubber to the ethylene propylene diene rubber is larger than 45:55 and smaller than 85:15. The apron band for spinning according to claim 1 or 2 , wherein the polyolefin-based resin contains polyethylene. The apron band for spinning according to any one of claims 1 to 3 , further comprising a core yarn embedded therein.

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