JPS6159461B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for continuously producing artificially soiled fabrics with solid stains. Artificially contaminated fabrics are indispensable for the development and evaluation of laundry detergents and cleaning research, and many artificially contaminated fabrics modeled after various stains have been developed. Artificially contaminated fabrics have the advantage of being able to be supplied in large quantities and at low cost with a certain quality, and that they are easier to quantify compared to natural stains. Conventionally, in many cases, artificially contaminated cloth was created by analyzing the dirt components attached to the human body such as sebum, preparing artificial dirt similar to it, and using carbon black as an indicator for removing the dirt from the human body. Methods that measure force have been widely adopted. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for continuously producing cloth contaminated with only solid dirt in order to directly examine the detergency of solid dirt such as dust. In addition to stains caused by sebum and the like, the stains that adhere to clothes are often solid stains that do not contain oil or fat components, which are often attached to clothes during outdoor exercise. This method artificially supplies such a soiled cloth, and its cleaning behavior is very similar to that of naturally contaminated cloth.Furthermore, according to the method of the present invention, the degree of contamination can be freely adjusted. By using the artificially contaminated cloth obtained in this way, it is easy to accurately confirm the difference in cleaning power of detergents. That is, the continuous contaminated fabric manufacturing method of the present invention uses Kanuma soil,
A contaminating liquid consisting of a dispersion or paste liquid is prepared by dispersing solid contaminants such as Kanto loam in water or an organic solvent such as tetrachlorethylene, and a white test cloth is brought into contact with this contaminant liquid, either at the same time as the contact or immediately after the contact. Brushing is carried out before the contaminated test cloth dries to ensure that solid stains are stably attached, a process that removes the dispersion liquid and fixes the stain (e.g. using a rotary wringer), and a drying process that removes excessively adhered stains ( This manufacturing method is characterized by (consisting of) a step of removing the contaminated cloth (for example, with a rotating brush, etc.) and, if necessary, a step of continuously winding up the contaminated cloth. The continuous contaminated cloth manufacturing method of the present invention will be explained with reference to the drawings and specific examples. In Fig. 1, the cloth 2 wound around the cloth feed roller (equipped with a weight-type brake) 1 is moved through the contamination bath 4 at a constant speed while being supported by the support rod 3. Alternatively, the cloth is guided to the rotating brush 5 in the air filter (or air is added), and both sides of the cloth are contaminated by massaging. The contaminated cloth is then led to a squeezing roller 6, where the dispersion is squeezed to fix the stain and keep the cloth feeding speed constant. And a drying room (hot air drying)
After that, excess dirt is removed by a rotating brush 9 in an excess dirt removal chamber 8, and then the resulting contaminated cloth is pulled by a pulling roller 10 and rolled up by a contaminated cloth winding section 11. take. The features of the method of the present invention can be further summarized as follows: (i) the ability to bring the test cloth into contact with a dispersion or paste-like liquid of solid soil and to apply the powder substance (solid soil) by brushing the test cloth before it dries; ) After drying, it has a function that allows the state of adhesion to be controlled by brushing the cloth. Such functionality makes it possible to produce fabrics with artificial solid stains that are more realistic. Here, it is inconvenient for the dispersion liquid and the paste liquid to be too dilute or too thick;
It is necessary to adjust it within a range of about % by weight. Preferably, it is adjusted to a paste state and applied, but the concentration of the solid substance at that time differs depending on the type of powder substance. The dispersion solvent for the contaminated liquid is not particularly limited, but from the viewpoint of workability etc., a volatile solvent is preferable, and for example, tetrachlorethylene is used. The rotating brush 5 in the pollution bath is preferably made of hair, plastic or felt. The dryer may be a commonly used hot air type dryer; for example, air is sent from a blower to a heater, heated by electric heat or the like, and sent to the drying chamber 7. The rotating brush 9 in the dirt removing room may be the same as the rotating brush 5 in the contaminated bathroom. The soiled cloth produced by the method of the present invention satisfies the basic characteristics regarding cleaning, and also has a good relationship with the cleaning properties of natural stains. Example 1 Using the continuous contaminated fabric manufacturing apparatus shown in FIG. 1, the dispersion medium concentration was 9.1wt% and solid soil; Kanto loam, dispersion liquid;
A full cotton cloth was contaminated with a contaminated dispersion of tetrachlorethylene at a rate of 1.5 meters/min.
Thereafter, the stain was fixed, dried, and the excess stain was removed to prepare a contaminated cloth. The contaminated cloth produced under these conditions had a reflectance of 44±2% (measured at a wavelength of 460 mμ, with the reflectance of MgO being 100%), and a uniformly contaminated cloth was obtained at a yield of over 90%. Example 2 Dispersion medium concentration 33.0wt% Dispersion liquid Pure water stain Kanto ROHM A contaminated cloth produced in the same manner as in Example 1 under the above conditions had a uniform contaminated cloth with a reflectance of 39 ± 2% (wavelength 460 mμ). Obtained with a yield of over 90%. Example 3 Dispersion medium concentration 33.0wt% Dispersion liquid Tetrachlorethylene stain Kanuma soil A contaminated cloth prepared in the same manner as in Example 1 under the above conditions was a uniform contaminated cloth with a reflectance of 61±2% (wavelength 460 mμ) was obtained with a yield of over 90%. Example 4 As a result of testing the cleaning power of detergents A and B using artificially contaminated cloth according to the present invention, as shown below, the difference in cleaning power was clearly and quantitatively determined compared to when using naturally contaminated cloth. I was able to do it.

[Table] However, the above values indicate the detergent power of detergent B when the detergent power of detergent A is set as 100. Comparative Example 1 An artificially contaminated cloth was prepared in the same manner as in Example 1, except that a guide roll was used in place of the rotating brush 5 in the apparatus used in Example 1, and brushing was not performed. In this way, the contaminated cloth produced without brushing at the same time or immediately after contact with the contaminated liquid had a reflectance of 60 to 70%, with large variations. Further, the results of testing the cleaning power of detergents A and B using this artificially contaminated cloth are shown in comparison with the artificially contaminated cloth and the naturally contaminated cloth of Example 1.

[Table] Contaminated cloth prepared under the conditions As is clear from the table above, when the artificially contaminated cloth of Example 1, in which brushing was performed when the test cloth came into contact with the contaminated liquid, was used, the cleaning power of detergents A and B was It was possible to determine the difference quantitatively most clearly.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a contaminated cloth manufacturing apparatus according to the method of the present invention. DESCRIPTION OF SYMBOLS 1... Cloth delivery roller, 2... Cloth, 3... Support rod, 4... Contamination bath, 5... Rotating brush, 6... Squeezing roller, 7... Drying chamber, 8... Excess stain removal chamber, 9...
Rotating brush, 10...pulling roller, 11... contaminated cloth winding section.

Claims (1)

[Scope of Claims] 1. A contaminated liquid consisting of a dispersion or paste liquid in which solid stains are dispersed is prepared, a test cloth is brought into contact with this contaminated liquid, and the contaminated test cloth is brushed at the same time as the contact or immediately after the contact before the contaminated test cloth dries. 1. A method for continuously producing contaminated cloth, comprising the following steps: a step of stably adhering solid dirt by performing a process, a step of removing a dispersion liquid and fixing the dirt, a drying step, and a step of removing excess adhering dirt. 2. The continuous method for manufacturing soiled cloth according to claim 1, wherein the liquid for dispersing solid stains is an organic solvent.