MXPA97002322A - Roller of traction for fibers, and its preparation - Google Patents

Abstract

In a fiber traction roller, a rubber roller is used as the upper roller, an amorphous, thin, quartz membrane, with a thickness of 0.05 to 5 microns, is supplied in all or part of the surface of the rubber roller, to improve both the retention of the fiber bundle and the abrasion resistance of the rubber surface. It is preferred that this thin quartz membrane contains carbon black, diamond powder, metal powder or fine powder of olefin tetrafluoride in dispersion. This amorphous, thin, quartz membrane is formed by applying an organic solvent solution of perhydropolisilazane, having a molecular weight of 600 to 1000, on all or part of the surface of the rubber roller, and then removing the solvent and heating the Coating layer

Description

TRACTION ROLLER FOR FIBERS. AND ITS PREPARATION BACKGROUND OF THE INVENTION The present invention relates to a fiber traction roller, which is used in a ring spinning machine, a twisting frame, a stretching frame, a deck spinning machine and a stretching texturing machine. . For example, in a ring spinning machine, a twisting frame, a stretching frame, a covering spinning machine and a stretching texturing machine, a pulling roller, in which a rubber roller is used as an upper roller Placed on a metal roller, like the bottom roller, it has been widely used in the process of preparing fibers by the traction-twisting of strands or filaments of cotton twines to make a bundle of fibers in a yarn. A relatively soft rubber material is used as the rubber roller to keep the fiber bundle safely and get the exact traction. Therefore, the surface of the rubber roller is severely worn and it is required to exchange the roller once for several months, in consideration of the high speed of preparation and the quality, such as the uniformity, of the yarn product.

Therefore, as such a traction roller, it is important that the fiber bundles are held securely between the upper rubber roller and the metal bottom roller, and the abrasion of the rubber surface, due to the passage of the fibers , it is reduced to the minimum as much as possible. The object of the present invention is to improve the tensile roller for the fibers, which comprises such a rubber roller, which is excellent both in retaining the fiber bundle and in the abrasion resistance of the rubber surface. SUMMARY OF THE INVENTION According to the present invention, the above problem has been solved by the coating of a thin, amorphous quartz membrane, 0.05 to 5 microns thick, on all or part of the surface of a soft rubber roller . For example, the thin amorphous quartz membrane, above, can be formed by applying a solution of organic solvent of perhydropolisilazane, having a molecular weight of 600 to 1000, on all or part of the surface of a relatively soft rubber roller. which has a rubber hardness of 60 to 802, according to JIS K 6301, and then remove the solvent and heat it in the air (usually at 120 to 1802C). As the above solvent, high polarity hydrocarbons, such as toluene, xylene, cyclohexane and the like are suitable. Detailed Description of the Invention In this case, improvements in practical performance can be achieved, such as the durability of the surface of the rubber roller, prevention of static electricity and prevention of the adhesion of impurities of the fibers, using a solution of Covering, in which carbon black, industrial diamond powder, metal powder and fine tetrafluorinated finishes, are mixed and dispersed in the polysilazane solution, if required. The quartz membrane of the present invention is rich in the resistance to bending, since it is amorphous. The thickness is preferably 5 microns or less, particularly 0.5 to 3 microns. In this case, it has been found to have a bending strength for repeated deformation of 5 mm in diameter. As the abrasion resistance, the Haze value of the membrane thickness of 0.5 miera, in an abrasion test of steel wool, of steel # 000, with a load of 250 g, for 60 rpm, was 1.8, and was confirmed to be much better than the Haze value of 8.2 for the rubber surface. Also, as shown in the following Examples, the present invention uses a contact angle to carbon, metal or tetrafluorinated olefin, which is a characteristic of amorphous quartz, and the chemical reaction of reducing a small amount of the oxide membrane present on the surface of particles, dispersing incorporating carbon black, diamond particles, lauminium powder and / or fine particles of tetrafluorinated olefin, in the amorphous quartz membrane, to greatly improve the abrasion resistance of the roller surface, characteristically to remove static electricity and to prevent adhesion of the impurities of the fibers, such as animal and vegetable oils, sweet cotton secretions or oligomers, in addition to retaining the fiber bundles and improving the abrasion resistance. The amount of the diamine particles and the like, dispersed in the quartz membrane, is usually from 5 to 25% by weight, preferably from 10 to 20% by weight. Preferred Modes of the Invention The following examples serve to illustrate the invention in more detail, although the invention is not limited to the examples. In the Examples, the hardness of the rubber was measured by JIS K 6301. Example 1 A roller, hardness 802, was manufactured mainly from nitrile rubber, as the upper roller equipped in a spinning frame, immersed in xylene to wash the surface. Next, a 20% xylene solution of perhydropolisilazane, having a molecular weight of 800 (Tonen Polysilazane PHPS-1, manufactured by Tonen Corporation), was applied on the roller, under rotation (300 rpm) and dried at 802C. for 10 minutes and then heated in a hot air oven at 150 C for 30 minutes, to coat an amorphous quartz membrane, 0.8 mm thick, on the roller surface. The surface hardness of the resulting roll was 762, which is substantially the same before coating. However, when mounted on the spinning frame and rotated by feeding cotton filaments, the uniformity of the yarns was improved, in comparison with the case of using an uncoated roller, and the abrasion of the roller surface was not observed yet. after 6 months of continuous operation, this resistance to abrasion is highly improved. EXAMPLE 2 320 mesh aluminum powder was mixed and dispersed in a 10% xylene solution of perhydropolisilazane, having a molecular weight of 950 (Tonen Polysilazane PHPS-2, manufactured by Tonen Corporation), in a weight ratio 20%, based on the weight of the polysilazane, to prepare a coating solution. A silicone rubber roller of a hardness of 602 was cleaned and defatted by xylene to prepare a front roller for the stretch frame. The above coating solution was applied and separated from the solvent in a 1002C dryer, and then heated in a 1502c hot air oven, to form an amorphous quartz membrane with an average thickness of 1.5 microns, containing aluminum on the surface of the roller. The resulting roll had a surface hardness of 722 and no change in the hardness of the rubber was substantially observed, compared to that before coating. However, the uniformity of the fiber twists was obtained by a roller pressure of 8 kg less than the usual pressure of 10 kg. In addition, no surface abrsion was observed even after continuous operation for a period three times greater compared to the roll before coating. EXAMPLE 3 An upper roller (rubber hardness of 802), was the pick-up portion, to spread and twist a spun polyester filament, cleaned and degreased by xylene. Next, with a solution of 10% xylene perhydropolisilazane, having a molecular weight of 1200 (Tonen Polysilazane PHPS-2, manufactured by Tonen Corporation), fine powder of tetrafluorinated propylene in a weight ratio of 10%, based on in the polymer and the same amount of diamanate powder were mixed to prepare a coating solution. The previous roller rotated inside the coating solution to apply on its surface and then heated to 100 C to separate the solvent and then heated in a hot air oven, at 150 C, for 30 minutes. The resulting upper roller had a coating of an amorphous quartz membrane 1.5 microns thick, which contains tetrafluorinated resin particles and carbon particles, on the surface. When equipped on a stretch and texturizing machine, to stretch and twist a polyester filament (40d / 16f) at a rate of 200 m / min, no abrasion was observed, no adhesion of the polyester oligomer or solution of oil on the surface of the roller, even after 24 hours of operation. The traction roller for fiber bundles, according to the invention, is excellent both in retaining bundles of fibers and in the resistance of surface abrasion.

It can be used efficiently and stably for a longer period than conventional. Also, the traction roller of the present invention, in which the carbon black and the metal powder are dispersed and contained in the amorphous belt membrane, shows a better improvement in the abrasion resistance of the roller surface. and it is also excellent at removing static electricity and preventing contamination.

Claims (3)

1. CLAIMS 1. A traction roller for fibers, in which a rubber roller is used, as the upper roller, characterized in that a thin amorphous quartz membrane is supplied, with 0.05 to 5 microns thick, over all or part of the surface of the rubber roller.
2. 2. A traction roller, according to claim 1, wherein the thin quartz membrane contains carbon black, diamond powder, metal powder or fine powder of olefin tetrafluoride, in dispersion.
3. 3. A method for the preparation of a tensile roller for fibers, in which a rubber roller is used as the upper roller, characterized in that a solution of an organic solenoid of perhydropolisilazane, having a molecular weight of 600 to 1000, on all or part of the surface of the rubber roller, and then removes the solvent and the coating is heated to produce a thin amorphous membrane of quarter, with a thickness of 0.05 to 5 microns.