JPH0226969A - Production of sanitary material - Google Patents

Abstract

PURPOSE:To prevent the slip-off of cotton fiber and obtain the subject material useful for toilet cotton, etc., by separating defatted raw cotton into single fibers, collecting the fibers to form a web, stacking the webs and partially compressing the laminate. CONSTITUTION:Defatted raw cotton is separated into single fibers with a carding engine and the fibers are collected to form a web. Plural webs are stacked and the obtained cotton sheet web is partially compressed to form pressed parts. Hydrogen bonds are formed between single fibers in the compressed part by this process to obtain the objective material.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for producing sanitary materials such as absorbent cotton, clean cotton, and makeup remover.

BACKGROUND OF THE INVENTION Hitherto, bulk cotton fibers have been used as sanitary materials such as absorbent cotton and clean cotton. Cotton fiber is suitable as a material for sanitary materials because it has excellent water absorption and soft texture. However, when conventional cotton fiber aggregates are used in cosmetic puffs, cleansing cotton, etc., the cotton fibers often fall through and adhere to the skin. This is because the cotton fibers in the aggregate are not bonded to each other. In order to eliminate such drawbacks, it is considered that the cotton fibers may be bonded together using a binder. However, it is not preferable to include a binder in products used as cosmetic puffs, clean cotton, etc. This is because binders are generally organic compounds, and if they come into contact with or adhere to the skin, they may cause rough skin or skin irritation. Therefore, the present invention is to perform a certain specific treatment on raw cotton fiber and a certain post-treatment to bind the cotton fibers together without incorporating a binder. That is, in the present invention, after degreasing raw cotton, it is split into single fibers using a card machine, and the single fibers are accumulated to create a web, and a sheet made by stacking a plurality of webs The present invention relates to a method for producing a sanitary material, characterized in that a cotton-like band is partially compressed to form a compressed part, and hydrogen bonds are created between single fibers in the compressed part. First, the raw cotton is degreased.The raw cotton is produced in the United States, the Soviet Union, Egypt, and Pakistan.It is cotton produced in Mexico and other parts of the world, and the surface of the cotton fibers is coated with cotton wax and honeydew.Oils and sugars such as castor bean Degreasing is performed to remove this oil and sugar. Degreasing involves extracting and removing oil with organic solvents such as chloroform, carbon tetrachloride, and benzene, or boiling with sodium hydroxide. The degreasing treatment may be carried out immediately after the raw cotton is intercolored, it may be carried out after the mixed cotton treatment, or it may be carried out after the wrap is formed. After the raw cotton is degreased. The cotton fiber mass is separated into each single fiber by a carding machine.The carding machine has a large number of comb-like needles on the circumference of a drum, and by feeding the cotton fiber mass to the rotating drum, The cotton fibers are combed and separated into single fibers.A web can be obtained by accumulating the separated single fibers on a conveyor.Since the web is relatively thin, it is possible to obtain a web by stacking the separated single fibers on a conveyor. Layer them together to form a thick sheet-like cotton belt.The number of webs to be piled up is 3 to 2.
Approximately 0 sheets is preferable. This sheet-like cotton band is partially compressed to form a compressed portion. Partial compaction is carried out, for example, by passing a sheet of cotton between a textured roll and a smooth roll. At the time of this compression, moisture may be added to the sheet-like cotton band in advance. Moisture is added by spraying water vapor onto the cotton sheet. Note that this steam may be at room temperature or may be heated steam. Furthermore, during this compression, the uneven roll and/or the smooth roll may be heated. A compressed portion is formed by partially compressing the sheet-like cotton band. In this compressed portion, hydrogen bonds occur between each single fiber of the cotton fiber. This is because the raw cotton has been subjected to a degreasing treatment in advance, so that almost no impurities are attached to the cotton fiber surface. That is,
Since oil and the like have been removed, the OH groups of cellulose molecules are exposed on the surface of each cotton fiber, and hydrogen bonds occur between these OH groups. The degree of compression may be such that hydrogen bonds occur between cotton fibers, and specifically, the degree of compression is 1716~
The thickness may be about 1/200. The compression portion may have any shape such as a dot shape or a line shape. The interval between the compressed parts is preferably shorter than the fiber length of the cotton fiber. In this way, when fishing on a boat, the cotton fibers will be combined with other cotton fibers at at least three compressed parts, making it difficult for the cotton fibers to come out. A suitable interval is about 1 to 10 spaces.The area of the compression part is not particularly limited and can be determined arbitrarily, but in the case of point-shaped compression parts, it is 0.0001 to 0.5 square cm. In the case of dot-shaped compressed parts, the number of compressed parts can also be determined arbitrarily, and is usually 5 to 50 per piece.
C1a level is good. Further, in the case of linear compressed parts, the width is preferably about 0.1 to 1 mm, and the interval between the linear compressed parts is preferably about 1 to 10 mm. The portion other than the compressed portion, ie, the uncompressed portion, may not be compressed at all, or may be slightly compressed. For example, it may be compressed to about 1/2 to 1/15 of the thickness of the sheet-like cotton band. The sheet-shaped sanitary material made of the cotton fiber aggregate obtained in this way can be used for cosmetic puffs etc.
Since the cotton fibers are bonded together by hydrogen bonds, the fibers will not fall out during use. [Examples] Example 1 Cotton grown in Pakistan was passed through a mixed batting process to form a wrap. Thereafter, the material was degreased by boiling it in a pressurized scouring pot at 2 atmospheres for about 3 hours using 2.5 degrees of sodium hydroxide. The degreased cotton was passed through a flat card machine to separate the cotton fibers into single fibers, and the single fibers were assembled to form a web. By stacking 12 of these webs, a sheet-like cotton belt with a basis weight of 200 g/rr (and an apparent thickness of 8 mm) was obtained.
It was passed between a concavo-convex roll having 25 convex portions/C+a of 5 mm on the circumferential surface and a rubber ρ smooth roll. Note that the pressure applied to the sheet-like cotton band between the uneven roll and the smooth roll was a linear pressure of 80 kg/cm. As a result, in the sanitary material obtained, the portions corresponding to the convex portions of the uneven roll became compressed portions, and the portions corresponding to the concave portions became non-compressed portions. Then, the thickness of the compressed part is 0.3 mm,
The thickness of the uncompressed part was 0.7 mm. Since the cotton fibers are bonded to each other by hydrogen bonds in the compression part, fewer cotton fibers fall off even when the surface of the sanitary material is rubbed, and the form stability of the sheet is also improved. Example 2 A sheet-like cotton band was obtained in the same manner as in Example 1. This sheet-like cotton band has a tip diameter of 0, 3 aIm,
25 protrusions with a height of 0°511II11 on the circumference/c'I
It was passed between a roughened roll and a smooth rubber roll. Note that the pressure applied to the sheet-like cotton band between the uneven roll and the smooth roll was a linear pressure of 50 kg/cm. The sanitary material thus obtained had similar appearance and physical properties to those obtained in Example 1, and had slightly improved form stability. Example 3 A sheet-like cotton belt was obtained in the same manner as in Example 1. While spraying steam heated to 100°C onto this sheet-like cotton band, a concave-convex roll having 25/call convex portions each having a diameter of 0.3 mm and a height of 0.5 mm at the tip, and rubber. It was passed between a smooth roll. In addition, the pressure applied to the sheet-like cotton band between the uneven roll and the smooth roll is a linear pressure of 30 k.
g/cm. The sanitary materials thus obtained had similar appearance and physical properties to those obtained in Examples 1 and 2, and were further improved in terms of morphological stability. Example 4 A sheet-like cotton band was obtained in the same manner as in Example 1. While spraying room-temperature water vapor onto this sheet-like cotton band, a rough roll having 25 protrusions/c+il on the circumferential surface with a tip diameter of 0.3 mm+ and a height of 0.5 mm and a smooth rubber roll were rolled. passed in between. In addition, the uneven roll is 130°
The pressure applied to the sheet-like cotton band between the uneven roll and the smooth roll was 30 kg/cm. The sanitary material thus obtained had almost the same appearance and physical properties as those obtained in Example 3. [Operation and Effects of the Invention] As explained above, the method for producing sanitary materials according to the present invention is to degrease raw cotton to remove oils and sugars such as cotton wax and honeydew that are attached to the surface of cotton fibers. After removal, a carding machine is used to create a sheet cotton strip, which is then partially compressed. Therefore, hydrogen bonds occur between the OH groups of cellulose exposed on the surface of the cotton fibers at the compressed portion, and the cotton fibers are bonded to each other. Therefore, in the sanitary material obtained by the manufacturing method of the present invention, the cotton fibers are bonded together in the compressed part, and even when used as a cosmetic puff or cleansing cotton, the cotton fibers will slip through and adhere to the skin. This has the effect of preventing this from happening. On the other hand, even if a sheet-like cotton band is created without degreasing the raw cotton and partially compressed, wax etc. remain attached to the surface of the cotton fiber.
The OH groups of cellulose, which is a constituent molecule of cotton fibers, are not exposed on the surface of the cotton fibers, and no hydrogen bonds occur between the OH groups of each cotton fiber. Therefore, the cotton fibers are not bonded to each other in the compressed portion, and when used in cosmetic puffs, etc., the cotton fibers fall off and adhere to the skin. As described above, the sanitary material obtained by the production method of the present invention can be suitably used as a cosmetic puff or cleansing cotton.

Claims (1)

[Claims] After degreasing the raw cotton, it is divided into single fibers using a card machine, and the single fibers are accumulated to create a web.
A method for producing a sanitary material, comprising partially compressing a sheet-like cotton band made by stacking a plurality of the webs to form a compressed part, and generating hydrogen bonds between single fibers in the compressed part.