JPH11279913A - Base material for roll and roll produced by using the material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a roll having small dimensional change and high long-term durability and usable for the squeezing of water, oil or chemicals by constituting the roll base material with a fiber sheet composed mainly of a specific high- tenacity fiber. SOLUTION: The objective base material for roll is composed of a fiber sheet having small dimensional change by the adsorption or absorption of water, etc., and composed mainly of a high-tenacity fiber (preferably nylon fiber) having a tensile tenacity of >=6 g/d (preferably >=7 g/d). The base material is suitable for a roll to squeeze water, etc., in the production of steel plate, nonferrous metal plate, plastics, film, resin plate, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base material for a roll and a roll using the same. For example, water, oil, and the like in a manufacturing process of a steel plate, a non-ferrous metal plate, a plastic, a film, or a resin plate. Alternatively, the present invention relates to a roll substrate capable of extracting a chemical and a roll using the same.

[0002]

2. Description of the Related Art Conventionally, in order to remove water remaining on a steel sheet after cleaning the steel sheet, a roll using a nonwoven fabric having an excellent water squeezing property and a high friction coefficient has been used.
Although tough nylon fibers were used as the fibers constituting the nonwoven fabric, the nylon fibers are liable to undergo dimensional changes due to absorption of water, so that the entire roll is deformed, and it is difficult to use the fibers for a long period of time. Was.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a roll base material which has a small dimensional change and can be used for a long period of time, and a roll using the same. The purpose is to:

[0004]

Means for Solving the Problems The roll substrate of the present invention comprises a fiber sheet mainly composed of high-strength fibers having a tensile strength of 6 g / d or more. This tensile strength is 6 g / d
Since the high-strength fibers described above have high crystallinity and a small dimensional change due to adsorption or absorption of water or the like, a fiber sheet mainly composed of the high-strength fibers has a small dimensional change due to water or the like. Therefore, the roll of the present invention including the roll base material can be used for a long period of time.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the tensile strength is set to 6 so that dimensional change due to water or the like is unlikely to occur.
g / d or more (preferably 7 g / d or more) high-strength fiber is used. As the high-strength fiber, for example, nylon fiber (nylon 6 fiber, nylon 66 fiber, etc., including tire cord and anti-hair), polyester fiber, vinylon fiber, or polyolefin fiber such as polyethylene fiber or polypropylene fiber is used. can do.
Among these, nylon fibers having excellent wear resistance and toughness can be preferably used, and nylon 66 fibers can be more preferably used. The tensile strength in the present invention refers to a value measured by a method defined in JIS L 1015 (Test method for chemical fiber staples).

The linear density of the high-strength fiber is not particularly limited, but is preferably 0.11 mg / m to 1.1 mg / m. When the linear density is less than 0.11 mg / m, the service life may be shortened, and 1.1 mg / m
If the ratio is more than 0.22, the squeezability of water or the like tends to decrease. Therefore, it is more preferably 0.22 mg / m to 0.88 mg / m. The high-strength fiber does not need to be one kind in terms of linear density, and if it contains two or more kinds, it is possible to produce a roll having excellent squeezing properties such as water and a long service life. For example, when the linear density is 0.22 mg / m
High strength fiber of about 0.44 mg / m and linear density of 0.55
A fiber sheet (base material for a roll) containing high-strength fibers of about mg / m to 0.77 mg / m is excellent in squeezability of water and the like, and can produce a roll having a long service life.

The high-strength fibers may be staples or filaments, but staples which can be freely blended with two or more kinds of fibers, have an excellent affinity for liquids, and are more excellent in exploitability. Preferably, there is. In the case of staples, the length is preferably about 30 to 110 mm. In the present invention, staple-like fibers (such as staples) obtained by cutting filaments can also be used.

[0008] Such high-strength fibers can be easily produced, for example, by melt-spinning according to a conventional method and then hot-drawing. Moreover, since it is commercially available, it can be easily obtained.

The fiber sheet of the present invention is mainly composed of the above high-strength fiber (50 mass) so as to have excellent dimensional stability.
% Or more), preferably 60 mass% or more, more preferably 70 mass% or more.

As the fibers other than the high-strength fibers, general synthetic fibers having a tensile strength of less than 6 g / d (for example, nylon fibers, vinylon fibers, vinylidene fibers, polyvinyl chloride fibers, polyester fibers, acrylic fibers, polyethylene) Fibers or polyolefin fibers such as polypropylene fibers) can be mixed.
When the fine fibers of not more than mg / m are contained, the denseness of the base material for a roll is improved, and as a result, the liquid absorbing property and the squeezing property by the capillary action are improved, which is preferable, and the linear density is 50 μg.
/ M or less is more preferably mixed.

The fine fibers originally have a linear density of 0.1
mg / m or less, and a linear density of 0.1
It may be generated by mechanically and / or chemically splitting splittable fibers exceeding mg / m. In addition, as a mechanical dividing method, for example, there are a needle, a fluid flow, a calendar, a flat press, and the like.
Examples of the chemical resolving method include extraction of a resin component with a solvent and swelling with a solvent.

The splittable fibers include, for example, sea-island type, orange type and multi-bimetal type. Among these, orange-type or multi-bimetal-type splittable fibers which can produce a denser base material for a roll without reducing the resin component are preferable. The resin component constituting the splittable fiber includes, for example, a nylon-based resin, a polyester-based resin, a polyolefin-based resin, and the like, and includes two or more of these resin components. It is preferable that the splittable fiber contains a nylon-based resin because fine fibers made of a nylon-based resin can be generated and the toughness of the roll base material is not impaired. The splittable fiber does not need to be a combination of different resin components, and may be a combination of similar resin components such as a combination of a polyethylene resin and a polypropylene resin. Such splittable fibers can be easily produced by a conventional composite spinning method or mixed spinning method, and are easily available because they are commercially available.

The fibers (including fine fibers) other than the high-strength fibers may be staples or filaments, but two or more types of fibers can be freely blended and have excellent affinity for liquids. It is preferable that the staple is more excellent in exploitability. For staples, 30 to 110 mm
It is preferable that the length is about long.

The ratio of the fibers (including fine fibers) other than the high-strength fibers is 50% in view of the balance with the high-strength fibers.
mass% or less, preferably 40 mass% or less, more preferably 30 mass% or less.

The roll base material of the present invention is a fiber sheet comprising the above-mentioned fibers. Examples of the fiber sheet include, for example, a woven fabric, a knitted fabric, a nonwoven fabric, and a composite thereof.
It is preferable that the nonwoven fabric has excellent exploitability.

Although the fiber sheet of the present invention can be manufactured by a conventional method, a preferred method of manufacturing a nonwoven fabric will be described. First, a fiber web made of the above-described fibers (high-strength fibers, and in some cases, other fibers (eg, splittable fibers)) is formed. As a method of forming the fiber web, for example, there are a dry method such as a card method and an air lay method, and a wet method. Among these, a fiber web formed by a dry method is preferable because it has excellent elasticity and excellent exploitability. After forming the fiber webs, different types of fiber webs may be laminated, such as laminating fiber webs having different manufacturing methods or laminating fiber webs having different fiber compositions.

Next, the fiber webs are bonded to form a nonwoven fabric. Examples of the joining method include entanglement by a needle or a fluid flow, fusion of fibers constituting the fiber web, adhesion by a binder, stitching by stitching, or a method of using these together. Among these, the entangled nonwoven fabric has a dense structure, and is preferable because the liquid absorbing property and the squeezing property by the capillary action are improved. In particular, a nonwoven fabric entangled by a fluid flow is more preferable because it has a denser structure.

The preferable entanglement conditions are as follows: in the case of a needle punch, the entanglement is performed at a needle density of about 10 to 400 needles / cm ^2;
Pressure of 0.1 to 30MPa from nozzle plate arranged in one row or two or more rows with 0.3mm, pitch 0.2-3mm
The fluid of a is ejected and entangled.

The non-woven fabric (roll substrate) produced in this manner preferably has an areal density of 50 to 800 g / m ² . If the areal density is less than 50 g / m ² , the strength may be low and the form stability may be poor.
If it exceeds / m ² , the hardness tends to vary in the thickness direction of the nonwoven fabric, so it is more preferably 100 to 400 g / m ² . Further, the thickness is preferably 0.5 to 4 mm.

The above-mentioned fiber sheet (especially non-woven fabric) may be used as a base material for a roll. However, if a polymer is attached to the fiber sheet, the fiber sheet is excellent in elasticity and squeezability, and has a long service life. Therefore, it is a suitable roll base material.

Examples of the high molecular polymer include styrene / butadiene rubber, butylene rubber, isoprene rubber, ethylene / propylene copolymer, ethylene / propylene / diene copolymer, nitrile / butadiene rubber, chloroprene rubber, butyl rubber, urethane Rubber, silicone rubber, polysulfide rubber, hydrogenated nitrile rubber, fluoro rubber, tetrafluoroethylene / propylene rubber, acrylic rubber, chlorosulfonated polyethylene rubber, polyether special rubber, epichlorohydrin rubber, propylene oxide rubber, ethylene Acrylic rubber, liquid rubber, norbornene rubber, thermoplastic elastomer, etc. can be used. Among these, styrene-butadiene rubber, nitrile-butadiene rubber, chloroprene rubber, urethane rubber, acrylic rubber, chlorosulfonated polyethylene, which are elastic, have high self-healing properties, and are excellent in water resistance, oil resistance, and heat resistance Rubber can be suitably used.

The adhesion rate of this high molecular polymer is 20
It is preferably about 70% by mass. 20 mass
If it is less than 70% by mass, the elasticity and the squeezing property may not be expected to improve much. If it exceeds 70% by mass, it becomes rubber-like. Is more preferable. In addition, this adhesion rate is a percentage when the mass of the roll base material after the adhesion of the high-molecular polymer is set to 1.

The method of attaching the high polymer can be carried out by a conventionally known method. For example, a fiber sheet is impregnated, sprayed, or coated with the above polymer latex, and then dried. do it,
Can be easily attached.

Since the roll of the present invention contains the above-mentioned roll base material, the dimensional change is small and can be used for a long time. As the roll, for example, (1) a roll in which a roll base material is wound around a shaft in a flat winding shape, (2) a roll in which a roll base material is spirally wound around a shaft, (3) There are rolls in which a large number of roll base materials are stacked in the longitudinal direction of the shaft. Among them, the roll surface is excellent in smoothness (3)
A roll in which a number of roll base materials are laminated in the longitudinal direction of the shaft is preferable. This preferable roll is formed, for example, by punching a roll base material into a substantially donut shape or an outer periphery into a substantially regular polygonal donut shape, forming a large number of elements, laminating a large number of elements on a shaft, and using a hydraulic press machine. And then grinding the roll surface with a lathe or sandpaper.

Examples of the present invention will be described below, but the present invention is not limited to the following examples.

[0026]

Example 1 Nylon 66 high-strength fiber 70 mass% having a tensile strength of 8 g / d, a linear density of 0.66 mg / m, and a fiber length of 64 mm,
A fiber web obtained by mixing a tensile strength of 7 g / d, a linear density of 0.33 mg / m, a nylon 66 high-strength fiber having a fiber length of 51 mm, and 30 mass%, and opening with a card machine is needle-punched (needle density: 200 needles / cm ² ) and entangled to produce a nonwoven fabric having an area density of 150 g / m ² and a thickness of 2 mm.

Next, the above-mentioned nonwoven fabric is immersed in a mixed solution containing a crosslinking agent in ethyl acrylate copolymer latex, squeezed between rolls, and then dried with a hot air drier.
Roll base material having physical properties as shown in Table 1 (adhesion rate:
50%).

[0028]

[Table 1]

Example 2 A nylon 66 high-strength fiber having a tensile strength of 8 g / d, a linear density of 0.66 mg / m and a fiber length of 64 mm was 70 mass%.
Linear density 0.66mg / m, fiber length 51mm, nylon 6
And polyester, and having an orange cross-sectional shape, capable of generating a nylon 6 fine fiber having a linear density of 55.6 μg / m and a polyester fine fiber having a linear density of 55.6 μg / m by division 30 mass% Mixed with
The fiber web was formed by opening with a card machine. Next, a water stream having a pressure of 10 MPa is jetted from the nozzle plates arranged in a line at a nozzle diameter of 0.13 mm and a pitch of 0.6 mm to the fiber web to entangle the fiber web and simultaneously split the splittable fibers. Fine fibers were generated to produce a nonwoven fabric having an areal density of 150 g / m ² and a thickness of 1.8 mm.

Next, the above-mentioned nonwoven fabric was immersed in a mixture of nitrile and butadiene rubber latex containing a crosslinking agent, squeezed between rolls, and then dried with a hot air drier to obtain the physical properties shown in Table 1. Roll base material (adhesion rate: 50%) having the same was manufactured.

Comparative Example A tensile strength of 4.5 g / d, a linear density of 0.66 mg / m, a nylon 66 fiber having a fiber length of 64 mm, 70 mass%, a tensile strength of 4.5 g / d, a linear density of 0.33 mg / m, A fiber web mixed with 30 mass% of nylon 66 fiber having a fiber length of 51 mm and opened by a card machine is entangled with a needle punch (needle density: 200 needles / cm ² ) to have a surface density of 150 g / m ² and a thickness of 150 g / m ² . A non-woven fabric having a thickness of 2 mm was manufactured.

Next, an ethyl acrylate copolymer was adhered in exactly the same manner as in Example 1 to produce a roll substrate (adhesion rate: 50%) having the physical properties shown in Table 1.

(Measurement of dimensional change) Example 1, Example 2,
After cutting each of the roll substrates of Comparative Example and Comparative Example into a 25 cm square, square markings each having a side of 20 cm were made. Next, each roll substrate was immersed in water for 24 hours. Thereafter, the roll substrate was pulled up, the length of the marking was measured, and the dimensional change (%) was calculated from the following equation. This value is also shown in Table 1. Dimensional change rate (%) = {(L ₂ −L ₁ ) / L ₁ } × 100 L ₂ : length after immersion, L ₁ : length before immersion (20 cm)

(Manufacture of Rolls) Each of the roll substrates of Examples 1, 2 and Comparative Examples
A large number of elements were formed by punching into a substantially donut shape having an inner diameter of 150 mm. Next, a large number of these elements were laminated on a shaft, pressurized by a hydraulic press, and then the roll surface was ground with a lathe and sandpaper to produce respective rolls. The hardness of these rolls (Shore A
Hardness) was as shown in Table 1.

(Squeezability test) After water was sprayed on an iron plate,
By passing an iron plate between the rolls (line pressure 98 N / cm), water on the iron plate was exploited. The state on the iron plate after the exploitation was observed to determine the squeezability. The results of this determination are also shown in Table 1.

(Service life test)
After repeating 00 times, the roll surface was observed. As a result, no particular change was observed on the roll surfaces of Example 1 and Example 2, and thus the roll was able to be evaluated as having a long service life. In contrast, the roll of the comparative example
Because the dimensional change of the roll base material is large, (drawing test)
While repeating this, undulations and irregularities occurred on the roll surface, and the roll surface became uneven. Therefore, the roll cannot rotate smoothly with vibration due to the rotation of the roll,
Because of poor drawability, the roll was evaluated as having a short service life.

From the above results, it was confirmed that the roll of the present invention had a small dimensional change and a long roll life. The roll of Example 1 had high self-healing properties and did not cause abnormal deformation. Furthermore, since the roll of Example 2 can be squeezed under low pressure by the capillary action, the roll life was longer.

[0038]

The roll base material of the present invention is composed of a fiber sheet mainly composed of high-strength fibers having a tensile strength of 6 g / d or more, and has a high strength of 6 g / d or more. Since fibers have high crystallinity and a small dimensional change due to absorption or absorption of water or the like, a fiber sheet mainly composed of high-strength fibers has a small dimensional change due to water or the like. Therefore, the roll of the present invention including the roll base material can be used for a long period of time.

Claims (2)

[Claims] 1. A roll base material comprising a fiber sheet mainly composed of high-strength fibers having a tensile strength of 6 g / d or more. 2. A roll comprising the roll base material according to claim 1.