JP-2026075594-A - Rolls and base materials for those rolls

Abstract

[Problem] To provide a roll that is excellent in extracting moisture and oil, has excellent durability, and can withstand long-term use, and to provide a base material for a roll that can be used to manufacture such a roll. [Solution] The roll base material of the present invention consists of a fiber sheet containing, as constituent fibers, more than 50 mass% and less than 80 mass% of ultrafine fibers having an irregular cross-section and a fiber diameter of 4 μm or less when converted to a circular cross-section. Preferably, the constituent fibers of the fiber sheet are bonded and fixed with nitrile rubber. The roll of the present invention is made by laminating a large number of the roll base materials, which have an outer shape of circular, on a shaft. [Selection Diagram] Figure 1

Inventors

• 桂 博史

Assignees

• 日本バイリーン株式会社

Dates

Publication Date

20260508

Application Date

20250828

Priority Date

20241022

Claims (3)

1. A base material for rolls, characterized by comprising a fiber sheet containing, as constituent fibers, more than 50 mass% and less than 80 mass% of ultrafine fibers having an irregular cross-section and a fiber diameter of 4 μm or less when converted to a circular cross-section.
2. The base material for rolls according to claim 1, characterized in that the constituent fibers of the fiber sheet are bonded and fixed with nitrile rubber.
3. A roll characterized in that a large number of roll base materials according to claim 1 or claim 2, which have a circular outer shape, are stacked on a shaft.

Description

This invention relates to a roll capable of removing moisture and oil from steel plates and the like, that is, a roll capable of extracting moisture and oil, and a base material for the roll. Conventionally, rolls have been used, for example, in the manufacturing process of steel plates, to extract moisture and oil adhering to the surface. For instance, rolls made of laminated nonwoven fabric composed of ultrafine, long fibers having a polymeric elasticity are known (Japanese Patent Publication No. 2008-2521). However, these rolls are prone to wear and tear due to repeated pressure application and release during use, resulting in poor durability. Japanese Patent Publication No. 2008-2521 (a) Plan view of an element punched out from the roll substrate of the present invention (b) Plan view of another element punched out from the roll substrate of the present inventionFront view of the roll of the present invention The roll substrate of the present invention consists of a fiber sheet containing more than 50 mass% and less than 80 mass% of ultrafine fibers with a fiber diameter of 4 μm or less, having a uniquely shaped cross-section, and exhibiting excellent water and oil extraction properties through the use of fine internal voids and capillary action. The higher the amount of ultrafine fibers, the better the moisture and oil extraction performance. Therefore, it is preferable that ultrafine fibers constitute 55 mass% or more of the fibers constituting the fiber sheet, and more preferably 60 mass% or more. On the other hand, if 80 mass% or more of the fibers constituting the fiber sheet are ultrafine fibers, the thin fiber diameter makes them prone to sagging due to repeated pressure and release during roll use, resulting in poor durability. Therefore, it is preferable that less than 80 mass% of the fibers constituting the fiber sheet are ultrafine fibers, preferably 75 mass% or less, and more preferably 70 mass% or less. The ultrafine fibers of this invention, having an irregular cross-sectional shape, allow the fibers to exist in closer proximity to each other, resulting in finer internal voids and excellent capillary action for extracting moisture and oil. This irregular cross-sectional shape is not particularly limited, but can be, for example, a roughly triangular, roughly square, roughly trapezoidal, or other roughly polygonal shape, as well as an elliptical, semicircular, or oval shape. Furthermore, it may contain two or more types of ultrafine fibers with different cross-sectional shapes. Although ultrafine fibers have irregular cross-sectional shapes, the fiber diameter of ultrafine fibers is considered to be the value obtained by converting it to a circular cross-section. The fiber sheet of the present invention may contain two or more types of ultrafine fibers with different fiber diameters. In fact, having different fiber diameters allows the fibers to exist in closer proximity, resulting in finer internal voids and exhibiting capillary action, thus providing excellent moisture and oil extraction properties. The resin constituting the ultrafine fibers of the present invention can be, for example, nylon resin, polyester resin, or polyolefin resin. Among these, ultrafine fibers made from nylon resin are preferred because they are tough and hydrophilic, resulting in excellent water extraction properties. Furthermore, ultrafine fibers made from polyester resin are preferred because they are lipophilic, resulting in excellent oil extraction properties. It is also possible to include two or more types of ultrafine fibers with different resin compositions, such as ultrafine fibers made from nylon resin and ultrafine fibers made from polyester resin. In the above combination, excellent water and oil extraction properties are achieved. Such ultrafine fibers may be ultrafine fibers that originally have an irregular cross-sectional shape, or they may be ultrafine fibers generated by mechanically and/or chemically splitting composite fibers consisting of two or more resin components with a circular cross-sectional shape and a fiber diameter exceeding 4 μm. Mechanical splitting methods include, for example, needles, fluid flow, calenders, and flat presses, while chemical splitting methods include, for example, methods of extracting and removing resin components with a solvent, or methods of swelling with a solvent. The latter type of composite fiber, consisting of two or more resin components, includes, for example, fiber cross-sectional shapes such as sea-island type, orange type, and multi-bimetal type. Among these, orange type or multi-bimetal type composite fibers are preferred because they are easily mechanically divisible, allow for closer fiber proximity, and facilitate the formation of dense fiber sheets with finer internal voids. Such divisible composite fibers can be manufactured by conventional composite spinning or mixed spinning methods. The ultrafine fibers of the present invention may be staples